CN106067697B - Method and device for executing wireless charging control of electronic device - Google Patents

Abstract

The present application provides a method and device for executing wireless charging control of an electronic device. In the method, the wireless charging control is executed with the aid of a simple response from a wireless charging device, wherein the wireless charging device is used to wirelessly charge the electronic device, and the method includes: receiving at least one packet from the electronic device, wherein the at least one packet is used to carry information of a wireless charging report of the electronic device; and controlling the wireless charging device to generate at least one simple response to confirm the at least one packet. The method and device disclosed in the present invention can enable the power control loop of the wireless power transmission system to operate continuously through a simple one-way communication control scheme rather than two-way communication, which can ensure overall performance and avoid problems in the prior art.

Description

Method and device for performing wireless charging control of electronic device

technical field

The present invention relates to foreign object detection (foreign object detection, FOD) of a wireless power transfer system such as a wireless charging system, and more particularly, to a method for wireless charging control and a related device.

Background technique

Since foreign objects may endanger the personal safety of users of wireless charging systems, foreign object detection has become an important issue in the field of wireless charging technology. For example, the foreign object here may be, for example, a digital versatile disc (DVD), which usually has a relatively thin metal layer. Due to eddy currents, the above-mentioned thin metal layer is easily heated during wireless charging, in which case the DVD may be considered a dangerous foreign object. Therefore, it is desirable to be able to stop wireless charging when a foreign object is detected.

According to the prior art, the existing foreign object detection method based on power loss detection is usually applied to the inductive wireless charging system instead of the resonant wireless charging system. When the existing foreign object detection method is applied to the inductive wireless charging system, the existing foreign object detection method can be used to detect foreign objects approaching the inductive wireless charging system. However, when this existing foreign object detection method is applied to a resonant wireless charging system, some problems may be encountered. As an example, one might observe that the power loss of a phone wirelessly charging in landscape orientation (case 1) is comparable to that of a phone in portrait orientation with an 8cm DVD nearby. There may be only a very small difference between the power loss under wireless charging (the second case), which means that it is difficult to judge which of the above two cases the wireless charging of the mobile phone belongs to by the power loss Happening. In this way, false warnings may be generated during foreign object detection (for example, it actually belongs to the first situation but is misjudged as the second situation), or it may cause detection failure (for example, it actually belongs to the first situation). the second case but was misjudged as the first case).

Considering the safety of users, it is necessary to prevent the above detection failures. In addition, considering the convenience of the user, it is also necessary to consider preventing the above-mentioned situation of generating false alarms. Therefore, if the existing foreign object detection method is implemented in the resonant wireless charging system, there must be a compromise between reducing the probability of the above-mentioned false alarm and reducing the probability of the above-mentioned detection failure. Therefore, there is a need for a new method to improve the wireless charging control for the wireless charging system.

Contents of the invention

In view of this, embodiments of the present invention provide a method and device for performing wireless charging control of an electronic device, so as to solve the above problems.

An embodiment of the present invention provides a method for performing wireless charging control of an electronic device, wherein the wireless charging control is performed by means of a simple response from the wireless charging device, wherein the wireless charging device is used to wirelessly charge the electronic device, the The method includes: receiving at least one packet from the electronic device, wherein the at least one packet is used to carry information of a wireless charging report of the electronic device; and controlling the wireless charging device to generate at least one simple response to confirm the at least one packet.

Another embodiment of the present invention provides an apparatus for performing wireless charging control of an electronic device, wherein the wireless charging control is performed by means of a simple response from a wireless charging device used to wirelessly charge the electronic device , the device includes at least a part of the wireless charging device, the device includes: a transmitter located in the wireless charging device, wherein the transmitter is used to output the transmitter current; and a control circuit located in the wireless charging device and coupled to The transmitter, wherein the control circuit is configured to receive at least one packet from the electronic device through the power output coil of the wireless charging device, wherein the at least one packet is used to carry the information of the wireless charging report of the electronic device, wherein the control The circuit is further configured to control the wireless charging device to acknowledge the at least one packet by using the transmitter to generate at least one simple response.

The method and device disclosed in the present invention can make the power control cycle of the wireless power transmission system continue to operate through a simple one-way communication control scheme instead of two-way communication. Compared with the prior art, the proposed method and related devices of the present invention can ensure the overall performance and avoid the problems in the prior art (such as increased manufacturing cost and insufficient channels in the frequency band).

Description of drawings

FIG. 1 is a schematic diagram of a device for wireless charging control according to an embodiment of the present invention;

2 is a schematic diagram of a wireless power transmission system according to an embodiment of the present invention;

Fig. 3 is a flowchart of a method for wireless charging control according to an embodiment of the present invention;

FIG. 4 is a multi-index (multi-indexes) control framework involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a multi-index control architecture involved in the method shown in FIG. 3 according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of a foreign object detection area involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a foreign object detection strategy control framework involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 8 is a wireless charging recovery process involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a random mode device control architecture involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 10 is a steady-state control framework involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 11 is an emergency protection control framework involved in the method shown in FIG. 3 according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a polling and simple response control scheme involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention;

FIG. 13 illustrates a flowchart of a wireless charging control method 900 of an electronic device performed by means of a simple response of the wireless charging device according to another embodiment of the present invention;

FIG. 14 illustrates a schematic diagram of a simple response control scheme of the method 900 shown in FIG. 13 according to an embodiment of the present invention;

FIG. 15 illustrates a schematic diagram of a simple response of the method 900 shown in FIG. 13 according to an embodiment of the present invention;

Fig. 16 illustrates a schematic diagram of a simple response of the method 900 shown in Fig. 13 according to another embodiment of the present invention;

Fig. 17 illustrates a schematic diagram of a simple response of the method 900 shown in Fig. 13 according to another embodiment of the present invention;

FIG. 18 illustrates a schematic diagram of a simple response of the method 900 shown in FIG. 13 according to another embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiments of the present invention, certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Include" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, "coupled" herein includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

The method and device of the embodiment of the present invention can correctly determine whether a foreign object has been detected, and can correctly determine whether the detected foreign object is a dangerous foreign object or a non-hazardous foreign object, so it can avoid the problems in the prior art. False warnings or false detection problems. In detail, in the case where the wireless charging transmitter is a resonant wireless charging transmitter, the method and device of the embodiments of the present invention can properly detect foreign objects through admittance detection and/or impedance detection. Detect, and when necessary, temporarily stop the wireless charging process, so it can prevent dangerous foreign objects from causing fire during the wireless charging process, and prevent non-dangerous foreign objects from interrupting the wireless charging process. In this way, the performance of the wireless charging transmitter and the personal safety of the user of the wireless charging transmitter can be ensured at the same time.

Please refer to FIG. 1 , which is a schematic diagram of a device 100 for wireless charging control according to an embodiment of the present invention, wherein the device 100 may include at least a part (eg part or all) of a wireless charging device. For example, the device 100 may include part of the wireless charging device, especially the device 100 may include at least one hardware circuit, such as at least one integrated circuit (integrated circuit, IC) in the wireless charging device and its related circuits . As another example, the device 100 may be all of the wireless charging devices. For another example, the device 100 may include a system including the wireless charging device (eg, a wireless power transfer system including the wireless charging device). For example, but not limited to, the wireless charging device may include a wireless charging transmitter (for brevity, it can also be regarded as a transmitter), such as a transmission board. For example, the above-mentioned wireless charging transmitter (such as a transmitting board) can be used to wirelessly charge a wireless charging receiver (for simplicity, it can also be regarded as a receiver, such as a mobile electronic device). For example, the mobile electronic devices may include, but are not limited to, mobile phones (eg, multifunction mobile phones), personal digital assistants (personal digital assistants, PDAs), and personal computers, such as laptop computers.

As shown in FIG. 1, the device 100 may include at least one (for example, one or more) detection circuits, which may be generally regarded as a detection circuit 110 in this embodiment, and may further include an index generation module 120, which includes a The group index generation circuit is coupled to at least one detection circuit (such as the detection circuit 110 shown in FIG. 1 ). For example, the number of index generating circuits in the set of index generating circuits can be equal to M, where the symbol M can represent an integer greater than 1. That is, the set of index generating circuits may include M index generating circuits 122-1, 122-2, . . . , and 122-M. In this embodiment, the device 100 may further include a foreign object detection (foreign object detection, FOD) strategy module 130, wherein the foreign object detection strategy module 130 is coupled to the set of index generating circuits, such as M index generating circuits 122 -1, 122-2, ..., and 122-M.

According to this embodiment, the above-mentioned at least one detection circuit (such as the detection circuit 110 shown in FIG. 1 ) is used for current detection and voltage detection to monitor the driving current I _DRV in the wireless charging transmitter respectively. (not shown in Figure 1) and a driving voltage V _DRV (not shown in Figure 1), wherein the driving current I _DRV and the driving voltage V _DRV are used to drive the power output coil of the wireless charging transmitter (not shown in Figure 1). In addition, the set of index generating circuits (such as M index generating circuits _122-1 , _122-2 , . Such as M indices 124-1, 124-2, . . . , and 124-M. In detail, the set of indexes may include a power loss index for indicating the power loss of the wireless charging operation performed by the wireless charging transmitter, and may further include an admittance-related index (admittance-related index), which corresponds to a driving The ratio of the current I _DRV to the driving voltage V _DRV or the reciprocal of the ratio of the driving current I _DRV to the driving voltage V _DRV . For example, in the case that the admittance related index corresponds to the ratio of the driving current I _DRV to the driving voltage V _DRV , the admittance related index may be an admittance deviation index (admittance deviation index), which may also be called "admittance deviation index". index". For another example, in the case that the admittance related index corresponds to the reciprocal of the ratio of the driving current I _DRV to the driving voltage V _DRV , the admittance related index may be an impedance deviation index, also referred to as an “impedance index”. In addition, the foreign object detection strategy module 130 is used to perform wireless charging foreign object detection according to the set of indexes, such as the index 124 generated by the M index generation circuits 122-1, 122-2, . . . , and 122-M. -1, 1242-2, ..., and 1242-M.

As mentioned above, the set of indexes may include a power loss index, which is used to indicate the power loss of the wireless charging operation performed by the wireless charging transmitter, and the set of indexes may further include an admittance related index, an admittance related index Corresponding to the ratio of the driving current I _DRV to the driving voltage V _DRV or the reciprocal of the ratio of the driving current I _DRV to the driving voltage V _DRV . However, the above are examples only and are not intended to limit the scope of the present invention. In some examples, the set of indices may further include a current-related index corresponding to the driving current I _DRV .

In some examples, the set of indexes may include a power loss index to indicate the power loss of the wireless charging operation performed by the wireless charging transmitter, and may further include a current-related index corresponding to the driving current _IDRV , which is not shown here. It is necessary to generate an admittance related index corresponding to the ratio of the driving current I _DRV to the driving voltage V _DRV or the reciprocal of the ratio of the driving current I _DRV to the driving voltage V _DRV .

In some examples, the set of indices may include an admittance-related index corresponding to the ratio of drive current I _DRV to drive voltage V _DRV or the reciprocal of the ratio of drive current I _DRV to drive voltage V _DRV , and may additionally include an index corresponding to A current-related index of the driving current I _DRV , where there is no need to generate a power loss index, the power loss index is used to indicate the power loss of the wireless charging operation performed by the wireless charging transmitter.

Please refer to FIG. 2 , which is a schematic diagram of a wireless power transmission system 200 according to an embodiment of the present invention. As shown in FIG. 2 , the wireless power transmission system 200 may include a wireless charging transmitter 210 (indicated by “Tx” in FIG. 2 ) and a wireless charging receiver 220 (indicated by “Rx” in FIG. 2 ), wherein The wireless charging transmitter 210 shown in FIG. 2 can be used as an example of the wireless charging transmitter described in the embodiment of FIG. 1 , and the wireless charging receiver 220 can be used as an example of the wireless charging receiver described in the embodiment of FIG. 1 .

According to this embodiment, the wireless charging transmitter 210 includes the detection circuit 110 shown in FIG. 1 , and the detection circuit 110 in this embodiment may include a voltmeter 112 (marked as "VM" in FIG. 2 ) and an ammeter. . For example, the ammeter of this embodiment may include a voltmeter 114 (labeled as “VM” in FIG. 2 ) and a sense resistor R _S . In addition to the detection circuit 110, the wireless charging transmitter 210 may include a driving circuit 212, a matching circuit 214 and a power output coil 218, wherein the power output coil 218 shown in FIG. Example of a coil. In addition, the wireless charging receiver 220 may include a power input coil 228 , and may further include a wireless charging receiver circuit for wireless charging control, wherein the wireless charging receiver circuit may include some components, such as some hardware circuits. For example, in a mobile electronic device (such as the mobile electronic device described in the embodiment of FIG. The wireless charging receiver 220 may serve as a charging module, and may charge the mobile electronic device by using the power obtained from the wireless charging transmitter 210 in the case of inputting the capability of the coil). In detail, when necessary, the charging module can be electrically connected to the mobile electronic device to charge the mobile electronic device by using at least a part (for example, a part or all) of the wireless power received from the wireless charging transmitter 210. The device is charged, wherein when the mobile electronic device does not need to be recharged in this way, the charging module can be separated from the mobile electronic device. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, in case a mobile electronic device (such as the mobile electronic device of the embodiment of FIG. 1 ) has the capability of being wirelessly charged, the wireless charging receiver 220 may include all of the mobile electronic device. Therefore, in addition to the above-mentioned wireless charging receiver circuit, the wireless charging receiver 220 may further include at least one (for example, one or more) processors, related control circuits and at least one storage module (for example, a hard disk drive (HDD) ), and/or non-volatile memory (non-volatile (NV) memory, such as flash memory).

In this embodiment, the driving circuit 212 is used to generate the driving voltage V _DRV and the driving current I _DRV , and use the driving voltage V _DRV and the driving current I _DRV to drive the power output coil 218 through the matching circuit 214 to wirelessly output Power to at least one (eg, one or more) wireless charging receivers other than the wireless charging transmitter 210 , such as the wireless charging receiver 220 shown in FIG. 2 . As shown in FIG. 2 , the two input terminals of the voltmeter 112 are respectively coupled to the two output terminals N11 and N12 of the driving circuit 212 for detecting the driving voltage V _DRV between the two output terminals N1 and N12 . In addition, the two input terminals of the voltmeter 114 are coupled to the two ends of the sensing resistor R _S and are used to detect the voltage difference between the two ends of the sensing resistor R _S . In this way, the detection circuit 110 can perform calculation operations according to the resistance value of the sensing resistor R _S and the voltage difference between the two ends of the sensing resistor R _S , in particular, the voltage difference between the two ends of the sensing resistor R _S can be divided by the sensing resistor R The resistance value of _S , and the result is used as the detection of the driving current I _DRV . In practice, the matching circuit 214 may include some impedance components, such as some capacitors, to enhance the power output performance of the power output coil 218 . One end of the sensing resistor R _S is coupled to an output end N11 of the driving circuit 212, the other end is coupled to an input end N21 of the matching circuit 214, and the other input end N22 of the matching circuit 214 is connected to another output end of the driving circuit 212. The two output terminals N31 and N32 of the matching circuit 214 are respectively coupled to the two input terminals of the power output coil 218 .

For a better understanding, some detailed implementations of the above wireless charging receiver circuit will be introduced as follows. The wireless charging receiver circuit may include a matching circuit and a rectifier on a power transmission path of the wireless charging receiver circuit. For example, the matching circuit may include some impedance components, such as some capacitors, to enhance the power input performance of the power input coil 228, and the rectifier may pass the alternating current (alternating The current (AC) power is converted into direct current (DC) power, especially into a DC output voltage, wherein the DC output voltage output from the rectifier can be used by the mobile electronic device. The above is used as an example only, and is not intended to limit the scope of the present invention. For another example, the wireless charging receiver circuit may further include a low dropout (LDO) voltage regulator, and the low dropout voltage regulator is also arranged on the power transmission path of the wireless charging receiver circuit, and The low-dropout voltage regulator is used for stabilizing the DC output voltage output from the rectifier to generate regulated output power for use by the mobile electronic device. In some examples, the wireless charging receiver circuit may include a detection module, the structure of which may be similar to the detection circuit 110 shown in FIG. The charging receiver 220 wirelessly receives power from the wireless charging transmitter 210). In detail, the wireless charging receiver 220 can transmit at least one (for example, one or more) packets to the wireless charging transmitter 210 through the power input coil 228, wherein the at least one packet can carry the received power indicating the wireless charging receiver 220 received power information. In this way, the wireless charging transmitter 210 can receive the at least one packet from the wireless charging receiver 220 through the power output coil 218, and can determine the receiving power of the wireless charging receiver 220 according to the received power information carried in the at least one packet. .

According to the architecture shown in FIG. 2 , the device 100 of this embodiment may include at least a part (eg part or all) of the wireless power transmission system 200 . For example, the device 100 may include a part of the wireless power transmission system 200 , especially may include a part of the wireless charging transmitter 210 , that is, the device 100 may include some components in the wireless charging transmitter 210 shown in FIG. 2 . For another example, the device 100 may include a part of the wireless power transmission system 200 , especially, the device 100 may be the entire wireless charging transmitter 210 , that is, the device 100 may include all components in the wireless charging transmitter 210 . For another example, the device 100 may be the entire wireless power transmission system 200 .

In addition, according to the architecture shown in FIG. 2 , the electric power can be transmitted step by step from left to right, for example, the DC power input to the driving circuit 212 (for example, the DC power used for the mobile electronic device) is transmitted to the last step by step. The wireless charging receiver circuit on the right, where some stages of the architecture experience power losses. When a foreign object (such as a metal object or a magnetic object) suddenly falls near the wireless charging transmitter 210 of this embodiment and starts to absorb energy from the wireless charging transmitter 210, the wireless charging receiver 220 (especially the The controller) can detect or estimate the received power of the wireless charging receiver 220 (for example, the wireless charging receiver 220 wirelessly receives the power from the wireless charging transmitter 210) and send a signal to the wireless charging transmitter 210 through related components. The received power report of the received power, the relevant components are, for example, the communication module in the wireless charging receiver 220, the matching circuit of the wireless charging receiver 220, the power input coil 228 of the wireless charging receiver 220, the power of the wireless charging transmitter 210 The output coil 218 , the received power report is, for example, a received power report packet, such as any packet in the above at least one packet, wherein the received power report packet may have an estimated value of the received power. In this way, the device 100 can detect the power loss according to the driving current I _DRV , the driving voltage V _DRV and the received power of the wireless charging receiver 220 to generate the power loss index mentioned above. In addition, the wireless charging transmitter 210 (especially the foreign object detection strategy module 130 in the device 100 shown in FIG. 1 ) can generate circuits 122-1, 122-2, ..., and 122-M) to perform the above wireless charging foreign object detection. Under the control of the foreign object detection strategy module 130 , the wireless charging transmitter 210 may temporarily stop outputting power to the wireless charging receiver 220 as needed, so as to prevent false alarms or detection failures in the prior art.

In detail, in the case that the wireless charging transmitter 210 is a resonant wireless charging transmitter, the device 100 (and its related operation method) may suitably perform foreign object detection through admittance detection and/or impedance detection , and the wireless charging process can be temporarily stopped as required, so as to prevent dangerous foreign objects from causing fire during the wireless charging process, and to prevent non-dangerous foreign objects from interrupting the wireless charging process. In this way, not only the performance of the wireless power transmission system 200 (especially the wireless charging transmitter 210 therein) can be ensured, but also the users of the wireless power transmission system 200 (especially the wireless charging transmitter 210 therein) can be ensured personal safety.

Fig. 3 is a flowchart of a method 300 for wireless charging control according to an embodiment of the present invention. The method 300 shown in FIG. 3 can be applied to the device 100 shown in FIG. 1 (especially the wireless power transfer system 200 shown in the embodiment of FIG. 2 ), and can be applied to the foreign object detection strategy module 130 therein. , the method 300 is described in detail as follows.

In step 310, the above-mentioned at least one detection circuit (such as the detection circuit 110 in FIG. 1 or FIG. 2 ) will perform the above-mentioned current detection and the above-mentioned voltage detection, so as to monitor the driving current I in the wireless charging transmitter 210 respectively. _DRV and the driving voltage V _DRV , wherein the driving current I _DRV and the driving voltage V _DRV are used to drive the power output coil 218 of the wireless charging transmitter 210 .

In step 320, the aforementioned set of index generating circuits (such as the M index generating circuits 122-1, _122-2 , ..., and 122-M shown in FIG. _DRV to respectively generate the set of indexes (such as M indexes 124-1, 124-2, . . . , and 124-M). For example, the set of indexes may include a power loss index for indicating the power loss of the wireless charging operation performed by the wireless charging transmitter 210, and may further include a ratio corresponding to a driving current I _DRV to a driving voltage V _DRV and a driving The admittance-related index of either of the reciprocals of the ratio of current I _DRV to drive voltage V _DRV . The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the set of indices may further include a current-related index corresponding to the driving current I _DRV .

In some examples, the set of indexes may include a power loss index for indicating the power loss of the wireless charging operation performed by the wireless charging transmitter 210, and may further include a current-related index corresponding to the drive current _IDRV , which is not necessary here. An admittance related index corresponding to any one of the ratio of the driving current I _DRV to the driving voltage V _DRV and the inverse of the ratio of the driving current I _DRV to the driving voltage V _DRV is generated.

In some examples, the set of indices may include an admittance-related index corresponding to any one of the ratio of drive current I _DRV to drive voltage V _DRV and the inverse of the ratio of drive current I _DRV to drive voltage V _DRV , and may additionally Including the current-related index corresponding to the driving current I _DRV , there is no need to generate a power loss index to indicate the power loss of the wireless charging operation performed by the wireless charging transmitter 210 .

In step 330 , the foreign object detection strategy module 130 performs the wireless charging foreign object detection according to the set of indexes (such as M indexes 124 - 1 , 124 - 2 , . . . , and 124 -M). Specifically, the foreign object detection strategy module 130 can determine a set of thresholds corresponding to the set of foreign object detection strategy control parameters according to a predetermined relationship between a set of thresholds and a set of foreign object detection strategy control parameters. , and the set of indexes can be compared with the set of thresholds to generate a set of comparison results, and a wireless charging control signal can be generated separately according to the set of comparison results (for example, the foreign object detection strategy module 130 shown in FIG. 1 output) to control whether to temporarily stop wireless charging. For example, the predetermined relationship between the set of thresholds and the set of foreign object detection strategy control parameters can be obtained from a database prepared in advance in the wireless charging transmitter 210 (or a look-up table prepared in advance in the wireless charging transmitter 210 (look up table, LUT)).

In practice, in order to make the correction of at least one (for example, one or more) foreign object detection strategies of the foreign object detection strategy module 130 have better plasticity, the foreign object detection strategy module 130 may include the above-mentioned at least One (eg, one or more) databases, and the at least one database can be used to store strategy information of the at least one foreign object detection strategy. In detail, according to the strategy information of the at least one foreign object detection strategy, such as the strategy information stored in the at least one database, the foreign object detection strategy module 130 can dynamically adjust at least one (for example, one or more) adjustable Threshold value, the at least one adjustable threshold value can be used for the above-mentioned wireless charging foreign object detection performed according to the set of indexes. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the above-mentioned at least one database can be set outside the foreign object detection strategy module 130, and the foreign object detection strategy module 130 can obtain the strategy information of the above-mentioned at least one foreign object detection strategy from the above-mentioned at least one database, wherein The aforementioned at least one database can be set in the wireless charging transmitter 210 .

In some examples, the foreign object detection strategy module 130 may include at least one (eg, one or more) lookup tables, such as the aforementioned lookup table, and the at least one lookup table may be used to store the at least one foreign object detection strategy policy information. In detail, according to the strategy information of the at least one foreign object detection strategy (such as the strategy information stored in the at least one lookup table), the foreign object detection strategy module 130 can dynamically adjust the at least one (for example, one or more ) adjustable threshold value, the at least one adjustable threshold value is used for the above-mentioned wireless charging foreign object detection performed according to the set of indexes. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the above-mentioned at least one lookup table can be set outside the foreign object detection strategy module 130, and the foreign object detection strategy module 130 can obtain the strategy information of the above-mentioned at least one foreign object detection strategy from the above-mentioned at least one lookup table , wherein the above at least one lookup table can be set in the wireless charging transmitter 210 .

In some examples, the foreign object detection strategy module 130 may include the above-mentioned at least one (such as one or more) databases and the above-mentioned at least one (such as one or more) look-up tables, and the above-mentioned at least one database and the above-mentioned at least one look-up table The policy information of at least one foreign object detection policy can be stored. Specifically, according to the strategy information of the at least one foreign object detection strategy, such as the strategy information stored in the at least one database and the strategy information stored in the at least one lookup table, the foreign object detection strategy module 130 can dynamically Adjust the above-mentioned at least one (for example, one or more) adjustable thresholds, and the at least one adjustable threshold can be used for the above-mentioned wireless charging foreign object detection performed according to the set of indexes. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the above-mentioned at least one database and/or the above-mentioned at least one lookup table (for example, the above-mentioned at least one database and/or the above-mentioned at least one lookup table) can be set outside the foreign object detection strategy module 130, and the foreign object detection The strategy module 130 can obtain the strategy information of the at least one foreign object detection strategy from the at least one database and the at least one lookup table, wherein the at least one database and the at least one lookup table can be set in the wireless charging transmitter 210 .

In some examples, in order to make the calibration of at least one (for example, one or more) foreign object detection strategies of the foreign object detection strategy module 130 have better plasticity, the foreign object detection strategy module 130 can be implemented in In a processing circuit running a set of program codes, such as a controller or a processor, the set of program codes is prepared in advance and can be stored in a storage module (such as a non-volatile memory (non-volatile ( NV) memory, such as flash memory), or hard disk (hard disk drive, HDD).

Please note that although FIG. 3 enumerates the related operations of steps 310-330, it is only used as an example and not intended to limit the scope of the present invention. According to some variations of this embodiment, at least a part (eg part or all) of the operations of step 310, at least a part (eg part or all) of the operations of step 320, and/or at least a part The operations of step 330 (eg, part or all) can be performed simultaneously. For example, at least a part (eg part or all) of the operations of step 310 and at least a part (eg part or all) of the operations of step 320 may be performed simultaneously. For another example, at least a part (eg part or all) of the operations of step 320 and at least a part (eg part or all) of the operations of step 330 may be performed simultaneously.

For a better understanding, some detailed implementations of the set of indexes in step 320 are as follows. Regarding the above power loss index, the device 100 can determine the charging power output from the wireless charging transmitter 210 according to the driving current I _DRV and the driving voltage V _DRV (for example, the wireless charging transmitter 210 wirelessly outputs to the at least one wireless charging receiver (such as the power of the wireless charging receiver 220), wherein the charging power output by the wireless charging transmitter 210 can be regarded as the transmission power (in short, it can be regarded as the Tx power described in some embodiments). For example, the device 100 can determine the transmission power by calculating the product of the driving current I _DRV and the driving voltage V _DRV . In addition to the transmission power, the device 100 may determine the received power of the at least one wireless charging receiver according to at least one received power report from the at least one wireless charging receiver (such as the received power report from the wireless charging receiver 220), wherein The received power of the above at least one wireless charging receiver can be regarded as receiver power (indicated by Rx power in some embodiments). In addition, the device 100 (especially the M index generating circuits 122-1, 122-2, . The output charging power (for example, the wireless charging transmitter 210 wirelessly outputs the power to the at least one wireless charging receiver (such as the wireless charging receiver 220)) and generates power according to the received power of the at least one wireless charging receiver loss index. In some embodiments, simply speaking, the power loss index can be regarded as power loss.

Regarding the aforementioned admittance-related index, in the case where the admittance-related index corresponds to the ratio of the driving current I _DRV to the driving voltage V _DRV , the device 100 may report the at least one received power from the at least one wireless charging receiver To determine the receiving power of the at least one wireless charging receiver, and determine the corresponding at least one wireless charging receiver according to the predetermined relationship between the admittance parameters of the standard (normalized) transmitter and the receiving power of the at least one wireless charging receiver The standard transmitter admittance parameter of the received power of the wireless charging receiver (in simple terms, it can be regarded as the standard Tx admittance). For example, the predetermined relationship between the standard transmitter admittance parameter and the received power of the at least one wireless charging receiver can be derived from a database, such as the database in the wireless charging transmitter 210 or the wireless charging transmitter 210. Another lookup table for . In addition, a specific index generation circuit among the set of index generation circuits (for example, one index generation circuit among the M index generation circuits 122-1, 122-2, . . . , and 122-M, such as the index generation circuit 122-3) The difference between the ratio of drive current I _DRV to drive voltage V _DRV and the standard transmitter admittance parameter described above can be calculated to generate the admittance correlation index, where the ratio of drive current I _DRV to drive voltage V _DRV may be considered the transmitter admittance (abbreviated "Tx admittance" in some implementations). Please note that for better understanding, in some embodiments, the ratio between the driving current I _DRV and the driving voltage V _DRV corresponding to the admittance-related index can be regarded as a current deviation.

In addition, regarding the above-mentioned admittance-related index, in the case where the admittance-related index corresponds to the reciprocal of the ratio between the driving current I _DRV and the driving voltage V _DRV , the device 100 may obtain the above-mentioned at least one wireless charging receiver according to The at least one received power report is used to determine the received power of the at least one wireless charging receiver, and the corresponding A standard transmitter impedance parameter (indicated by a standard Tx impedance) of the received power of the at least one wireless charging receiver. For example, the predetermined relationship between the standard transmitter impedance parameter and the received power of the at least one wireless charging receiver can be obtained from a database, such as the database in the wireless charging transmitter 210 mentioned above or the Another lookup table. In addition, a specific index generation circuit in the set of index generation circuits (such as M index generation circuits 122-1, 122-2, ..., and an index generation circuit in 122-M, such as index generation circuit 122-3 ) can calculate the difference between the reciprocal of the ratio between the driving current I _DRV and the driving voltage V _DRV and the above-mentioned standard transmitter impedance parameter to generate the admittance correlation index, wherein the ratio between the driving current I _DRV and the driving voltage V _DRV The inverse of the ratio between V DRV and I DRV (ie, the ratio between the drive voltage V _DRV and the drive current I _DRV ) can be regarded as the transmitter impedance (illustrated by Tx impedance in some embodiments). Please note that for better understanding, in some embodiments, the admittance-related index corresponding to the inverse of the ratio between the driving current I _DRV and the driving voltage V _DRV can be regarded as an impedance change.

Regarding the above-mentioned current-related index, please note that the current-related index is different from the admittance-related index. The device 100 can determine the receiving power of the at least one wireless charging receiver according to the at least one receiving power report obtained from the at least one wireless charging receiver, and can determine the receiving power of the at least one wireless charging receiver according to the standard transmission current parameter and the receiving power of the at least one wireless charging receiver. A predetermined relationship between the powers is used to determine a standard transmission current parameter (also referred to as a standard Tx current) corresponding to the received power of the at least one wireless charging receiver. For example, the predetermined relationship between the standard transmitted current parameter and the received power of the at least one wireless charging receiver may be obtained from a database, such as a database in the wireless charging transmitter 210, or another source in the wireless charging transmitter 210. A lookup table. In addition, a specific index generation circuit in the group of index generation circuits (for example, an index generation circuit in M index generation circuits 122-1, 122-2, ..., and 122-M, such as index generation circuit 122-2) may The difference between the driving current I _DRV and the above-mentioned standard transmit current parameter is calculated to generate the current correlation index, wherein the driving current I _DRV can be regarded as the transmit current (also represented as Tx current in some embodiments). Please note that for better understanding, in some embodiments, the current-related index can be regarded as the change of current.

According to some embodiments, the device 100 may generate a warning control signal according to at least a part of the comparison results in the set of comparison results, wherein the warning control signal is used to control the warning user interface of the wireless charging transmitter 210 to point out foreign objects as a hazardous foreign object or a non-hazardous foreign object. For example, the above warning user interface may include (but not limited to) at least one (eg, one or more) light emitting diode (LED), wherein the at least one LED may be used as a warning LED.

According to some embodiments, the aforementioned group of foreign object detection strategy control parameters may include a received power parameter, wherein the received power parameter corresponds to the received power of the at least one wireless charging receiver. In detail, the group of foreign object detection strategy control parameters may further include a wireless charging receiver count parameter, wherein the wireless charging receiver count parameter represents the number of wireless charging receivers in the at least one wireless charging receiver. For example, the set of foreign object detection policy control parameters may further include at least one device type parameter, wherein the at least one device type parameter corresponds to the transmitter type of the wireless charging transmitter 210 (in some embodiments, it is represented by Tx type ), or at least one receiver type of the above at least one wireless charging receiver (indicated by Rx type in some embodiments), such as the receiver type of the wireless charging receiver 220 .

According to some embodiments, a specific wireless charging receiver of the at least one wireless charging receiver may determine at least one random value to control the timing of packet transmission of the at least one wireless charging report related to the specific wireless charging receiver. In addition, according to the above at least one random value, the specific wireless charging receiver can send at least one random phase delay packet, wherein each random phase delay packet in the at least one random phase delay packet can have a sequence of The random phase delay of the time slots in the slots, and the at least one random phase delay packet may carry the information of the at least one wireless charging report. In addition, the device 100 can accumulate the packet information of a plurality of packets (such as the aforementioned plurality of received power report packets) within a predetermined period to generate an accumulated value, wherein the plurality of packets include the information sent by the specific wireless charging receiver. The aforementioned at least one random phase delays the packet, and the length of the predetermined period is greater than or equal to twice the time length of the time slot. In addition, the device 100 can determine the above-mentioned counting parameter of the wireless charging receiver according to the accumulated value. In detail, the device 100 may perform a filtering operation on the accumulated value to generate the wireless charging receiver count parameter.

According to some embodiments, the device 100 can access a pre-prepared foreign object detection control database. In addition, the foreign object detection control database can indicate at least one predetermined area on the coordinate plane (Rx_power, Tx_admittance), such as the foreign object detection area, wherein the coordinate Rx_power can represent the above-mentioned at least one wireless charging receiver The received power of the device and the coordinate Tx_admittance may represent the ratio between the driving current I _DRV and the driving voltage V _DRV , and the at least one predetermined region may correspond to a hazardous foreign object or a non-hazardous foreign object. In addition, according to the foreign object detection control database, the device 100 can determine whether to temporarily stop the wireless charging according to the received power of the at least one wireless charging receiver and the ratio between the driving current I _DRV and the driving voltage V _DRV .

In practice, the foreign object detection control database and the above-mentioned database can be integrated into the same database, but the above is only used as an example, and is not intended to limit the scope of the present invention. In some examples, the foreign object detection control database and the above-mentioned databases may be different databases respectively.

In addition, the above at least one predetermined area may be associated with one or more adjustable thresholds used by the foreign object detection strategy module 130 , but the above is only used as an example and not intended to limit the scope of the present invention. In some examples, it is not necessary to associate the at least one predetermined region with the one or more adjustable thresholds used by the foreign object detection strategy module 130 .

According to some embodiments, the set of indices in step 320 may be generated under a steady state associated with the wireless charging operation performed by the wireless charging transmitter 210 . In addition, the device 100 can perform at least one steady state detection in the wireless charging transmitter 210 to ensure that the set of indices is generated under the steady state.

According to some embodiments, the device 100 may generate another set of indices according to at least the drive current I _DRV and the drive voltage V _DRV , wherein the other set of indices may include a current index to indicate the drive current I _DRV , and may additionally include an admittance index To indicate the ratio between the driving current I _DRV and the driving voltage V _DRV . For better understanding, the above current index can also be expressed as Tx current, and the admittance index can also be expressed as Tx admittance. In addition, the device 100 can perform the wireless charging foreign object detection according to the set of indexes and the other set of indexes. For example, when the other set of indexes indicates that a dangerous foreign object is detected, the device 100 (especially the foreign object detection strategy module 130 therein) can immediately stop wireless charging, and can temporarily avoid using the foreign object. group index. Therefore, by utilizing the other set of indexes, the device 100 can perform emergency foreign object detection, wherein the set of indexes can be temporarily ignored when the wireless power transfer system 200 (or the wireless charging transmitter 210 ) is in an emergency state.

FIG. 4 is a multi-index (multi-indexes) control architecture involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. It can be seen from the curve shown in (a) of FIG. 4 that the power loss index (which can be regarded as power loss in this embodiment) changes with time. In addition, it can be seen from the curve shown in (b) of FIG. 4 that the current-related index (for better understanding, it can be regarded as a current change in this embodiment) changes with time. In addition, it can be seen from the curve shown in (c) of FIG. 4 that the admittance-related index (in this embodiment, it may be the admittance change for better understanding) will change with time, and the present embodiment The admittance correlation index of the example corresponds to the ratio between the drive current I _DRV and the drive voltage V _DRV .

For example, the time represented by the horizontal axis in (a)-(c) of FIG. 4 can be in seconds, and the ratio of the index represented by the vertical axis in (a)-(c) of FIG. The index can be increased or decreased (for example, using a related amplifier in the corresponding index generation circuit to generate the index in the index generation module 120), so as to prevent the index from being unusable and/or prevent the index from being truncated. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the units of time represented by the horizontal axes in (a) to (c) of FIG. 4 may be changed. Furthermore, in some examples, it is not necessary to scale (eg, scale up or down) at least one (eg, one or more) of the set of indices.

According to this embodiment, one or more wireless charging receivers 220 and an 8 cm digital versatile disc (such as the above-mentioned 8 cm DVD) can be selectively placed on the wireless charging transmission at different points in time. device 210. At the beginning, it is the state of no wireless charging (marked "no load" in (a) of Figure 4), and the wireless charging receiver 220 and DVD are not placed on the wireless charging transmitter 210; after that, the wireless charging The receiver 220 is vertically (portrait orientation) placed on the wireless charging transmitter 210, the maximum coupling will be generated between Rx and Tx, and a charging current of 800 mA (milliamperes, mA) will be generated (in FIG. 4 Labeled "800mA Longitudinal" in (a), causing the curve shown in (a) of Figure 4 to rise and switch to a higher level. Subsequently, the wireless charging receiver 220 is placed on top of the wireless charging transmitter 210 in a landscape orientation, and the minimum coupling between Rx and Tx will be generated, and a charging current of 800 mA is still generated (in (a of FIG. 4 ) marked as "800mA lateral"), causing the waveform shown in (a) of Figure 4 to rise again and rise to a higher level. Additionally, the waveform may rise based on another reason, such as the wireless charging strategy of the device 100 . In addition, the wireless charging receiver 220 is placed on the wireless charging transmitter 210 vertically (portrait orientation), and the charging current is still 800mA (marked as "800mA vertical" in (a) of FIG. 4 ), resulting in ( The waveform shown in a) returns to a lower level (eg approximately the level shown between 30-60 seconds). Thereafter, the DVD can be placed adjacent to the wireless charging receiver 220 such that both the wireless charging receiver 220 and the DVD sit on top of the wireless charging transmitter 210 (labeled "800mA Vertical" and 8 cm in (a) of FIG. DVD", causing the waveform shown in Figure 4(a) to rise again and rise to another higher level. Finally, the DVD is removed, causing the waveform shown in Figure 4(a) to drop to approximately Lower level (for example, approximately the level shown between 30 and 60 seconds)

Although the power loss of case A (referring to wirelessly charging a wireless charging receiver placed in landscape orientation) is the same as that of case B (referring to wireless charging of a vertically placed wireless charging receiver with a DVD placed nearby) There is only a small difference in power loss (as shown in (a) of Figure 4, the level of the waveform corresponding to condition A and the level of the waveform corresponding to condition B are close to each other in the vertical axis direction), but the The waveform shown in (b) represents a change in current and can be used to distinguish between state A and state B, and the waveform in (c) of FIG. 4 represents change in admittance and can be used to distinguish between state A and state B. For example, as shown in (b) of FIG. 4 , the level on the vertical axis of part of the waveform (mostly) corresponding to the waveform of the situation B and the part of the waveform (absolutely) of the waveform corresponding to the situation A Most of them) have obvious differences in the levels on the vertical axis, so the device 100 (especially its foreign object detection strategy module 130) can effectively distinguish the situation A from the situation B according to the above-mentioned current-related index, without being affected by the graph. 4 (b) shows the influence of the amplitude swing. For another example, as shown in (c) of Figure 4, the levels corresponding to part of the waveform (most of) in the waveform of condition B and the level of part (most of) of the waveform corresponding to condition A There is a clear difference in the level of the vertical axis, so the device 100 (especially its foreign object detection strategy module 130) can effectively distinguish between the situation A and the situation B according to the above-mentioned admittance-related index, without being affected by the situation shown in FIG. 4 Affected by the amplitude swing shown in (c).

Therefore, based on the multi-index control architecture shown in FIG. 4 , the method 300 and its associated device 100 can correctly determine whether a foreign object is detected, without being affected by coupling changes caused by different receiving positions (Rx positions). Therefore, the problems of false alarm or detection error faced by the prior art can be avoided. Specifically, in the case that the wireless charging transmitter is a resonant wireless charging transmitter, the method 300 and its related device 100 can correctly perform foreign object detection by means of admittance detection and/or impedance detection. detection (especially the wireless charging foreign object detection in step 330).

FIG. 5 is a schematic diagram of a multi-index control architecture involved in the method 300 shown in FIG. 3 according to another embodiment of the present invention. The waveform in (a) of FIG. 5 can indicate that the counting parameter of the wireless charging receiver (in this embodiment, expressed as the number of devices or the number of Rx for simplicity and clarity) will change with time. Please note that the wireless charging receiver count parameter represents the number of wireless charging receivers in the at least one wireless charging receiver. In addition, the waveform shown in (b) of FIG. 5 may indicate that the transmission power (represented as Tx power in this embodiment for simplicity and clarity) changes with time. In addition, the waveform shown in (c) of FIG. 5 may indicate that the transmitter admittance (denoted as Tx admittance in this embodiment for simplicity and clarity) will vary with time, wherein the admittance of this embodiment The relative index corresponds to the ratio between the driving current I _DRV and the driving voltage V _DRV . In addition, the waveform shown in (d) of FIG. 5 may indicate that the transmission current (indicated as Tx current in this embodiment for simplicity and clarity) changes with time.

For example, the time represented by the horizontal axis in (a)～(d) of FIG. 5 can be taken as a unit, and the data value represented by the vertical axis in (a)～(d) of FIG. Scaling (for example, preparing data for generating the corresponding index in the index generation module 120 through the relevant calculation unit in the corresponding calculation circuit) prevents the data from being unusable and/or prevents the data from being truncated. The above is used as an example only, and is not intended to limit the scope of the present invention. In some examples, the units of time represented by the horizontal axes in (a) to (d) of FIG. 5 may vary. In some examples, it is not necessary to process at least a portion (eg, part or all) of the data (eg, the data used to generate the corresponding index) by scaling.

According to this embodiment, one or more of wireless charging receivers 220, another wireless charging receiver (such as a replica of wireless charging receiver 220), a DVD as described above, and wireless charging receivers that are not compatible with wireless The electronic device of the charging transmitter 210 (labeled as “iPhone” in FIG. 5 for example) can be selectively placed on the wireless charging transmitter 210 at different time points. At the beginning (when the time is 0 seconds), wireless charging has not been performed, and the wireless charging receiver 220 , the other wireless charging receiver, the DVD and the incompatible electronic device are not placed on the wireless charging transmitter 210 . Next, the wireless charging receiver 220 is placed on the wireless charging transmitter 210 (for a better understanding, this state is marked "a mobile phone" in (a) of FIG. 5 ), resulting in (a) of FIG. 5 The waveform of any one (for example, one) of ~(d) rises and rises to a higher level. Afterwards, the wireless charging receiver 220 and the other wireless charging receiver (such as a replica of the wireless charging receiver 220) are placed on the wireless charging transmitter 210 (for clarity, this state is shown in (a) of FIG. 5 Marked as "two mobile phones"), causing any (for example, one) of the waveforms in (a)-(d) of Figure 5 to rise again and rise to a higher level. After this, the other wireless charging receiver is removed, leaving only the wireless charging receiver 220 on top of the wireless charging transmitter 210 (for clarity, this state is marked as " A mobile phone"), causing any of the waveforms shown in (a) to (d) of Figure 5 to drop to a lower level again (similar to the level between 20 seconds and 30 seconds). Then, the wireless charging receiver 220 and the above-mentioned incompatible electronic devices are all placed on the wireless charging transmitter 210 (for better understanding, this state is marked as "a mobile phone + iPhone"), resulting in waveform changes shown in any of (b) to (d) of Figure 5. Afterwards, the aforementioned incompatible electronic devices are removed, leaving only the wireless charging receiver 220 on top of the wireless charging transmitter 210 (for a better understanding, this state is marked as "one" in (a) of FIG. 5 Only mobile phone"), resulting in any waveform changes shown in (b) to (d) of Figure 5. In addition, the DVD can be placed adjacently, so that the wireless charging receiver 220 and the DVD are both located on the wireless charging transmitter 210 (for better understanding, this state is marked as "one" in (a) of Figure 5 mobile phone+DVD"), resulting in any waveform changes shown in (b) to (d) of Figure 5. Finally, the DVD is removed, resulting in the waveform changes shown in any one of (b)-(d) of FIG. 5 .

Note that in this embodiment, hazardous foreign objects such as this DVD may cause more power loss than non-hazardous foreign objects such as the incompatible electronic devices described above. In addition, the above-mentioned hazardous foreign objects (such as this DVD) may cause the transmitter admittance (or Tx admittance) to become larger, and the non-hazardous foreign objects (such as the aforementioned incompatible electronic devices) may cause cause the transmitter admittance (or Tx admittance) to become larger (for example, larger than the transmitter admittance caused by the above-mentioned dangerous foreign objects), wherein the device 100 (especially the foreign object detection strategy module 130) can be based on The admittance of the transmitter is used to distinguish whether the wireless charging belongs to "a mobile phone", "a mobile phone+iPhone", and "a mobile phone+DVD", without being affected by (c) in Figure 5 Affected by wave swings. Therefore, according to the detection data shown in the waveform of FIG. 5 , the device 100 (especially its foreign object detection strategy module 130 ) can control the wireless charging transmitter 210 to selectively stop wireless charging when necessary. In the case where a foreign object that will not be heated (such as the aforementioned incompatible electronic device in this example) is placed adjacently, provided the power loss is within a predetermined range and the transmitter admittance (or Tx admittance) falls within The wireless charging receiver 220 can still be wirelessly charged within the interval corresponding to the pre-defined predetermined area, such as a specific predetermined area among the above-mentioned at least one predetermined area.

Therefore, based on the multi-index control architecture shown in FIG. 5 , the method 300 and the device 100 can correctly determine whether a foreign object is detected, and can correctly determine whether the detected foreign object is a dangerous foreign object or a non-hazardous foreign object. Therefore, the problems of false warning or false detection faced by the prior art can be avoided. In detail, in the case where the wireless charging transmitter is a resonant wireless charging transmitter, the method of the present invention and the related device can properly detect foreign objects through admittance detection and/or impedance detection (especially is the wireless charging foreign object detection shown in step 330), and when necessary, the wireless charging process can be temporarily stopped, so it can prevent dangerous foreign objects from causing fire during the wireless charging process, and can prevent non-dangerous foreign objects from interrupting the wireless charging process The wireless charging procedure described above. In this way, the performance of the wireless charging transmitter and the personal safety of the user of the wireless charging transmitter can be ensured at the same time.

FIG. 6 is a schematic diagram of a foreign object detection area involved in the method 300 of FIG. 3 according to an embodiment of the present invention, wherein the foreign object detection area shown in FIG. 6 can be regarded as an example of the aforementioned specific predetermined area. For example, the coordinate plane (Rx_power, Tx_admittance) mentioned in some embodiments of FIG. 3 and FIG. 4 may refer to the coordinate plane (Rx power, Tx admittance) shown in FIG. 6 . In addition, the Rx power shown on the horizontal axis of FIG. 6 may represent the received power of the above-mentioned at least one wireless charging receiver, and the Tx admittance shown on the vertical axis of FIG. 6 may represent the above-mentioned transmitter admittance, that is, the driving current The ratio between I _DRV and the driving voltage V _DRV .

In practice, specific waveforms on the coordinate plane (Rx_Power, Tx_Admittance), such as the waveform labeled "Tx Estimated Admittance of Rx in Normal Mode", can be prepared in advance according to some experiments, as a result of generating The reference of the foreign object detection area, which is marked as “Tx estimated admittance of Rx in normal mode” means the transmitter admittance corresponding to the estimated received power of the wireless charging receiver 220 in normal mode.

Please note that the foreign object detection area indicated by the above foreign object detection control database is prepared in advance, and the foreign object detection area can be used to indicate whether the foreign object is a dangerous foreign object or a non-hazardous foreign object. When the received power (i.e. Rx power) of the at least one wireless charging receiver has just been determined according to the at least one received power report from the at least one wireless charging receiver (such as the wireless charging receiver 220), the device 100 may base on the above The pre-prepared foreign object detection control database is used to calculate the intersection point of the boundary of the foreign object detection area and a specific line to determine two adjustable thresholds TH1 and TH2, wherein the specific line corresponds to the line Way (onlinemanner) and just decided to receive power. After the above-mentioned adjustable thresholds TH1 and TH2 are determined online (such as in the case of TH1<TH2), the device 100 (especially the foreign object detection strategy module 130 inside it) can use the latest detection value of Tx admittance Whether it falls into the interval of [TH1, TH2] determines whether the foreign object is a dangerous foreign object or a non-hazardous foreign object. For example, when it is detected that the latest detection value of the Tx admittance falls into the interval [TH1, TH2], the device 100 (especially the foreign object detection strategy module 130 therein) can determine that the foreign object is It is not a dangerous foreign object; otherwise, the device 100 (especially the foreign object detection strategy module 130 therein) will determine that the foreign object is a dangerous foreign object. In this way, the device 100 (especially the foreign object detection strategy module 130 therein) can decide whether to temporarily stop wireless charging according to whether the foreign object is a dangerous foreign object. For example, when the foreign object is detected as a dangerous foreign object, the device 100 (especially the foreign object detection strategy module 130 therein) will control the wireless charging transmitter 210 to temporarily stop wireless charging. For another example, when the foreign object is detected as a non-hazardous foreign object, the device 100 (especially the foreign object detection strategy module 130 therein) can control the above-mentioned warning user interface to point out the foreign object is a non-hazardous foreign object.

According to some embodiments, the device 100 may respectively use multiple sets of tables of variable types (in particular, multiple sets of look-up tables, such as the aforementioned look-up tables) related to the threshold. For example, the above tables may respectively correspond to different power losses, Tx currents, Tx admittances, Tx types and Rx types, and so on.

FIG. 7 is a schematic diagram of a foreign object detection strategy control framework involved in the method 300 of FIG. 3 according to an embodiment of the present invention. As shown in FIG. 7, the index generating circuit 122-1 may include an amplifier (marked as "G" in Fig. 7) for generating the above-mentioned power loss index (marked as "power loss" in FIG. 7), where applicable A gain to the power loss index to process the power loss index by scaling (e.g., scaling up or down) when the power loss index is detected by the foreign object detection strategy module 130 (labeled "FOD" in FIG. 7 ). strategy") to achieve better dynamic range. In addition, the index generation circuit 122-3 may include an amplifier (labeled as "G" in FIG. 7) to generate the above-mentioned admittance-related index (labeled as "admittance change" in FIG. 7), especially corresponding to the drive current The aforementioned admittance-related index of the ratio between I _DRV and the drive voltage V _DRV , to which another gain can be applied to address the admittance by scaling (eg, scaling up or down) correlation index to achieve a better dynamic range when the admittance correlation index is utilized by the foreign object detection strategy module 130 . In addition, the index generating circuit 122-2 may include an amplifier (labeled "G" in FIG. 7 ) to generate the above-mentioned current-dependent index (labeled "Current Variation" in FIG. 7 ), where another gain may be applied to The current-related index is processed by scaling (eg, scaling up or down) to achieve a better dynamic range when the current-related index is utilized by the foreign object detection strategy module 130 .

As shown in FIG. 7, the above-mentioned group of foreign object detection strategy control parameters may include the above-mentioned wireless charging receiver count parameter (indicated by the number of devices or the number of Rx in this embodiment), and may additionally include at least one of the above-mentioned devices Type parameters, such as a transmitter type parameter indicating the above-mentioned transmitter type (indicated by Tx type in this embodiment), and a receiver type parameter indicating the above-mentioned receiver type (indicated by Rx type in this embodiment) . For example, the transmitter type may be a particular class of a plurality of different classes of transmitters, and the receiver type may be a specific class of a plurality of different receivers, wherein the different classes of receivers Some types may correspond to different receiving impedances (ie, Rx impedances). For another example, the above-mentioned transmitter type may be a specific category among multiple different categories of transmitters, and the above-mentioned receiver type may be a specific category among multiple categories of receivers, wherein multiple categories of the above-mentioned receivers Some of the different categories may correspond to different receiving impedances (ie, Rx impedances). In addition, the aforementioned group of foreign object detection strategy control parameters may further include receiver power (ie, Rx power in this embodiment). In addition, the above-mentioned at least one (for example, one or more) foreign object detection strategies of the foreign object detection strategy module 130 may include: according to the above-mentioned set of foreign object detection strategy control parameters, using multiple sets corresponding to the set index Lookup table, the appropriate lookup table for the set of indexes is selected on-line. In this way, the foreign object detection strategy module 130 can determine the set of thresholds of the above-mentioned set of foreign object detection strategy control parameters according to the predetermined relationship between the set of thresholds and the set of foreign object detection strategy control parameters, and The set of indexes can be compared with the set of thresholds to generate the set of comparison results respectively, and the above-mentioned wireless charging control signal (the output of the foreign object detection strategy module 130 shown in FIG. 1 ) can be additionally generated according to the set of comparison results ) to control whether to temporarily stop wireless charging. The above is used as an example only, and is not intended to limit the scope of the present invention.

Please note that the foreign object detection strategy module 130 can include a predetermined logical combination, and can use the predetermined logical combination to perform logical operations (such as one or more OR (or) operations and/or one or A plurality of AND (and) operations) to generate the output of the foreign object detection strategy module 130 shown in FIG. One (for example, one or more) AND logic operation units, such as the OR logic operation unit and the AND logic operation unit shown in FIG. 7 . For example, the predetermined logic combination may be implemented by hardware circuits, and the predetermined logic combination may include a predetermined combination of multiple logic circuits. In detail, the OR logic operation unit and the AND logic operation unit shown in FIG. 7 can be implemented by an OR logic gate and an AND logic gate respectively. The above is used as an example only, and is not intended to limit the scope of the present invention. For another example, the predetermined logic combination may be implemented by a part of program codes in the set of program codes running on the processing circuit.

With the aid of the predetermined logic combination and the look-up table selected online to indicate the set of thresholds, the foreign object detection strategy module 130 can correctly perform the wireless charging foreign object detection described in step 330, and can properly generate FIG. 1 The output of the foreign object detection strategy module 130 shown is used to control the wireless charging transmitter 210 to operate correctly (for example, to control the wireless charging transmitter 210 to stop wireless charging or continue wireless charging). For example, in the case of detecting a foreign object (especially a dangerous foreign object), the foreign object detection strategy module 130 can control the wireless charging transmitter 210 to stop wireless charging (marked as "Tx stop in Fig. 7 Charge"). The above is used as an example only, and is not intended to limit the scope of the present invention. Please note that the foreign object detection strategy module 130 may include another predetermined logic combination, and may use the other predetermined logic combination to perform logical operations according to at least a part (eg, a part or all) of the set of comparison results (e.g., one or more OR operations and/or one or more AND operations) to generate another output of the foreign object detection strategy module 130, wherein the other output of the foreign object detection strategy module 130 can be used to control the alert User interface, such as the above-mentioned warning LED. Thus, by utilizing the aforementioned look-up table selected in-line to indicate the set of thresholds, and the predetermined logical combination and the other predetermined logical combination (labeled "Multiple Threshold Tables + Detection Logic" in FIG. 7 ), foreign The object detection strategy module 130 can correctly perform the wireless charging foreign object detection described in step 330 and can properly generate the output of the foreign object detection strategy module 130 shown in FIG. 1 and the output of the foreign object detection strategy module 130 Another output is used to control the wireless charging transmitter 210 to act correctly (for example, to control the wireless charging transmitter 210 to stop wireless charging or to continue wireless charging, and to selectively control the warning user interface).

For example, when a dangerous foreign object is detected, the foreign object detection strategy module 130 can control the wireless charging transmitter 210 to stop wireless charging (for better understanding, it is marked as "Tx stop in Fig. 7 Charge"). For another example, in the case of detecting a safe foreign object (ie, a non-hazardous foreign object), the foreign object detection strategy module 130 can control the wireless charging transmitter 210 to maintain wireless charging (for better understanding , labeled as "Tx Hold Charge" in FIG. 7 ), and the alert user interface (eg, the alert LED) can be otherwise controlled to indicate that the foreign object is a non-hazardous foreign object. For another example, when no foreign object is detected, the foreign object detection strategy module 130 can control the wireless charging transmitter 210 to continue wireless charging (for better understanding, it is marked as "Tx continue" in FIG. 7 Charge"). For the sake of brevity, the details of some similar features in this embodiment will not be repeated.

FIG. 8 is a wireless charging recovery process involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. According to this embodiment, the device 100 can compare the initial Tx current stored in its internal memory (especially the current value Ta of the initial Tx current) with the current Tx current (especially the current value of the current Tx current T) to determine whether a foreign object is removed.

As shown in FIG. 8 , when the FOD state is triggered (or declared) (for example, a state indicating that a foreign object is detected), the device 100 can control the wireless charging transmitter 210 to stop wireless charging, especially by turning the wireless charging transmitter 210 remains in the strobe mode (strobe mode) and stops charging. At this time, the device 100 can control the wireless charging transmitter 210 to output a series of strobe currents, such as an initial Tx current with a current value Ta and a current current with a current value T. In detail, when the foreign object detection state is triggered (or asserted), the device 100 may store the current value Ta of the initial Tx current in the memory. The current value of a series of stroboscopic currents will decrease with time. When it is detected that the difference between the current value Ta of the initial Tx current and the current value of one of the series of strobe currents (such as the current value T of the current Tx current) is greater than a predetermined value Tb (for example, Ta-T>Tb) , it means that the foreign object has been removed, and the device 100 can control the wireless charging transmitter 210 to restart charging (for example, perform normal wireless charging).

FIG. 9 is a schematic diagram of a random mode device control architecture involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. According to this embodiment, the device 100 can determine the number of random mode devices, that is, the number of wireless charging receivers operating in random mode, such as the above-mentioned specific wireless charging receiver that can transmit the at least one random phase delay packet. In the random mode, any one of the wireless charging receivers can transmit random phase-delayed packets (such as the at least one random phase-delayed packet mentioned above), and can perform in-band communication.

For example, the aforementioned packet information may be accumulated in the aforementioned predetermined period, such as the predetermined period T, wherein the predetermined period T may be greater than or equal to twice the length of the slot time in the random pattern. That is, the predetermined period T may be greater than or equal to twice the time length of the periodic time slots used by any of the above wireless charging receivers. In detail, the packet detection module in the wireless charging transmitter 210 (labeled as "Packet Detect" in FIG. 9 ) may transmit a value (such as a logic value to indicate that a packet with a random phase delay is detected) to FIG. 9 to allow this value to be handled by some boundary protection units, such as the initialization control and dump units (labeled "INT /DUMP"), or a comparison unit (such as the threshold detection function on the upper half path of the architecture of Figure 9). In addition, the processing results generated by the critical protection units may be sent to amplifiers (labeled "G" in the upper half path of the architecture of FIG. 9) for processing by scaling (eg, scaling up or down), where The processing result output by this amplifier can be filtered by an IIR (Infinite Impulse Response, infinite impulse response) low-pass filter (marked as "IIR" in the upper half path of the architecture in Figure 9), and the filtered processing result can be delayed again The hysteresis unit and the deglitch unit (labeled "HYS" and "DEG" respectively in the upper half of the architecture of FIG. 9) are processed to determine the expected number of devices, such as the number of devices described above. Note that the lower half-path of the architecture in Figure 9 may include some components similar to those shown in the upper half-path of the architecture in Figure 9, such as another comparison unit, another amplifier, and another IIR low-pass filter, where wireless charging The power detection module of the transmitter 210 (marked as “power detection” in FIG. 9 ) can obtain power information from the above-mentioned packet information (such as the power information carried by the above-mentioned at least one random phase delay packet, especially those The power information carried in the random phase delay packet of the wireless charging receiver) to allow the power information to be processed by the other comparison unit, the other amplifier, and the other IIR low-pass filter to generate all Average power values for these wireless charging receivers. The architecture of FIG. 9 can thereby determine the overall device power (labeled "Device Power" in FIG. That is, the overall received power of the wireless charging receivers, wherein the overall received power can be regarded as an example of the received power of the at least one wireless charging receiver, and can be regarded as an example of the Rx power shown in FIG. 7 .

FIG. 10 is a steady-state control architecture involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. In order to make the wireless charging transmitter 210 have better performance, the device 100 can perform steady-state detection to determine whether the wireless charging transmitter 210 is in a steady state of power transmission. In detail, some judgment operations related to the above-mentioned wireless charging foreign object detection need to be performed under the steady state of power transmission.

As shown in FIG. 10 , multiple parameters of the wireless charging transmitter 210 and/or at least one wireless charging receiver mentioned above, such as the rectified voltage (rectified voltage) Vrect of the wireless charging receiver 220, the transmission driving voltage (such as the driving voltage V _DRV ), and the transmit current (labeled as “Rx Vrect”, “TxVin” and “Tx Current” in FIG. 10 ), can be monitored by the architecture shown in FIG. 10 . For example, the architecture shown in FIG. 10 can be set in the wireless charging transmitter 210 , especially in the device 100 . In addition, each of these parameters may be filtered by a low pass filter (LPF) for eliminating glitches, and may be filtered by a high pass filter (HPF) for The offset is reduced or eliminated, and can be processed by the comparison unit (for example, the threshold detection function on the corresponding path among the three paths in the architecture of FIG. 10 ). For example, the rectified voltage Vrect of the wireless charging receiver 220 can be filtered by the low-pass filter LPF1 and the high-pass filter HPF1, and the transmission driving voltage (Tx Vin) can be filtered by the low-pass filter LPF2 and the high-pass filter HPF2 , and the transmit (Tx) current may be filtered by a low-pass filter LPF3 and a high-pass filter HPF3. In addition, all filtering results will be sent to an AND logic operation unit (such as an AND logic gate, or an AND logic operation unit implemented by the program code running on the above-mentioned processing circuit), and this AND logic operation unit will The filtering result is subjected to an AND logic operation to generate a power stability index (labeled as "power stability" in FIG. 10 ) to indicate whether the wireless charging transmitter 210 is in a power transmission steady state. For example, by applying the steady-state control architecture shown in FIG. 10 to the device 100, when the output fluctuations of the high-pass filters HPF1, HPF2, and HPF3 are all within a predetermined range (such as the predetermined range ΔY1 shown in FIG. 10 ) or a predetermined During the period (such as the predetermined period ΔT shown in Figure 10), all the filtering results are in the true state (TRUE state, such as high level), and the AND logic operation unit will therefore output the state of "TRUE" (such as high level), so that the power stability index indicates that the wireless charging transmitter 210 is in the power transmission steady state.

FIG. 11 is an emergency protection control framework involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. According to this embodiment, the device 100 can perform emergency foreign object detection according to the above-mentioned another set of indexes, and is not limited to any judgment in the foreign object detection of the above-mentioned set of indexes or is limited to the above-mentioned steady state detection. As shown in FIG. 11 , any one of Tx current and Tx admittance can be monitored by using a comparison unit (threshold detection function on either of the upper and lower paths shown in FIG. 11 ). For example, when the Tx current and/or the Tx admittance is in a "TRUE" state (such as a high level), and the OR logic operation unit outputs the "TRUE" state (such as the high level), so that The emergency foreign object detection index in the output of the architecture shown in FIG. 11 indicates that the wireless charging transmitter 210 is in an emergency state. In this way, the wireless charging transmitter 210 can stop the wireless charging when the Tx current reaches a first predetermined value or the Tx admittance reaches a second predetermined value, wherein the first predetermined value and the second predetermined value can correspond to those shown in FIG. 7 The number of Rx shown (that is, the number of devices mentioned above) and the Rx power shown in FIG. 7 .

FIG. 12 is a schematic diagram of a polling (polling) and simple response control scheme involved in the method 300 shown in FIG. 3 according to an embodiment of the present invention. The polling and simple answering control scheme can be applied to a transmitter Tx (eg, wireless charging transmitter 210) such as a power transmission unit (Power Transmitting unit, PTU), and can be applied to a receiver Rx (eg, wireless charging receiver 220 ) such as a power receiving unit (Power Receiving Unit, PRU). For ease of understanding, the power transfer unit can be used as an example of the transmitter Tx and the power receiving unit can be used as an example of the receiver Rx. But this is just an example, not a limitation of the present invention. In some examples, at least one or both of the transmitter Tx and the receiver Rx may have different implementations.

For example, the power transmitting unit 710 (such as the wireless charging transmitter 210) shown in the left half of FIG. 12 can limit the wireless charging power transmitted to the power receiving unit 720 shown in the right half of FIG. The unit 720 needs to coordinate with the power transfer unit 710 to ensure the overall performance of wireless charging. For example, the power receiving unit 720 can perform power polling on the power receiving unit 710, specifically, for example, can send a packet to the power transmitting unit 710 to request to increase power (increase wireless charging power) or reduce power (decrease wireless charging power). In addition, the power transmitting unit 710 may respond to the power polling of the power receiving unit 720 with a simple reply without transmitting any packet, so as to inform the power receiving unit 720 whether to agree or reject the power polling. But this is just an example, not a limitation of the present invention. According to some embodiments, the packet transmitted from the power receiving unit 720 to the power transmitting unit 710 may carry (or carry) the above power polling information.

According to some embodiments, the header field in the packet transmitted from the power receiving unit 720 to the power transmitting unit 710 may carry (or carry) header information. By way of example, and not limitation, the header information may include a default header content "OVP" to indicate an overvoltage condition OVP (for example, the rectified voltage at the output of a rectifier in a wireless charging receiver circuit Vrect is greater than or equal to the preset overvoltage threshold corresponding to the maximum allowable voltage level of the rectified voltage Vrect, wherein the rectified voltage Vrect may be a DC voltage level Vrect relative to the ground terminal, and is used to indicate the power drop condition PWR-Dn( For example, the preset header content "Dn" for the power receiving unit requesting to reduce power), the preset header content "UP" for indicating the power up condition PWR-Up (for example, the power receiving unit requires increasing power), and the preset header content for The preset header content “OK” indicates the ideal power condition PWR-OK (for example, the power receiving unit reports that the rectified voltage Vrect is within a target range, such as the ideal voltage range of the rectified voltage Vrect).

FIG. 13 illustrates a flow chart of a wireless charging control method 900 of an electronic device performed by means of a simple response of the wireless charging device according to another embodiment of the present invention. The method 900 shown in FIG. 13 can be applied to a wireless charging device such as the wireless charging transmitter 210, in particular, can be applied to a control circuit of the wireless charging device (such as the control circuit of the wireless charging transmitter 210), and can also be applied to The wireless power transmission system 200 of the embodiment shown in FIG. 2 is only an example and not a limitation of the present invention. In some embodiments, the method shown in FIG. 13 can be applied to the power transfer unit 710 shown in FIG. 12 , in particular, it can be applied to the control circuit of the power transfer unit 710 , and the method is described as follows.

In step 910, the control circuit of the wireless charging device (for example, the control circuit may include at least a part (such as a part or the whole) of the architecture shown in FIG. 1 ) may receive a plurality of packets from the electronic device through the power output coil 218, wherein Each of the plurality of packets may be used to carry (or carry) wireless charging report information of the electronic device, and may include unacknowledged header information. For example, but not limitation, the plurality of packets in step 910 may include at least one random phase delay packet in the above embodiments. For example, but not limitation, the unconfirmed header information may include the default header content "OVP" in the packet in the above embodiment, the default header content "DN" in the packet in the above embodiment, the above The default header content “UP” in the packet in the embodiment and the default header content “OK” in the packet in the above embodiment.

In step 920, the control circuit of the wireless charging device may control the wireless charging device (for example, by using a transmitter Tx located in the wireless charging device, such as the wireless charging transmitter described above, in particular, by using a transmitter Tx coupled to the wireless charging device A power amplifier of the control circuit in the wireless charging device, wherein the control circuit and the power amplifier are located in the wireless charging device) to generate at least one simple response corresponding to at least one packet (such as one or more packets) of the plurality of packets ( Such as one or more simple responses), to acknowledge (acknowledge) the at least one packet in the plurality of packets. For example, the control circuit of the wireless charging device can control the wireless charging device to generate at least one simple response corresponding to at least one of the plurality of packets to confirm at least one of the plurality of packets, without passing any packet from the wireless charging device Send information to electronic devices. In particular, the wireless charging device does not need to send any packet to the electronic device to confirm the at least one packet. Therefore, the methods and devices disclosed in the present invention (such as the method 900 and the device 100) can make the power control cycle of the wireless power transfer system 200 continue to operate through a simple one-way communication control scheme instead of two-way communication, wherein when the wireless charging device such as The power consumption can be reduced when the transmission board 210 does not transmit any modulation signal (such as wireless charging). Compared with the prior art, the proposed method and related devices of the present invention can ensure the overall performance and avoid the problems in the prior art (such as increased manufacturing cost and insufficient channels in the frequency band).

According to some embodiments, at least one of the plurality of packets described in step 910 may include at least one random phase delay packet mentioned in the above embodiments, wherein each random phase in the at least one random phase delay packet The delay packet has a random phase delay relative to the time slot, and the at least one random phase delay packet is used to transmit at least one wireless charging report information of the electronic device.

According to some embodiments, the at least one simple response may include at least one pulse (eg, one or more pulses) in time domain or frequency domain. For example, the electronic device may detect at least one simple response and regard the at least one simple response as an acknowledgment of the at least one packet in the plurality of packets in step 910, without further requiring the at least one simple response Perform decoding.

According to some embodiments, the electronic device may detect the at least one simple response, for example, the electronic device may detect the at least one simple response and regard the at least one simple response as among the plurality of packets in step 910 acknowledgment of the at least one packet without decoding the at least one simple response.

FIG. 14 illustrates a schematic diagram of a simple response control scheme of the method 900 shown in FIG. 13 according to an embodiment of the present invention. The curve shown in the upper part of FIG. 14 may represent the current of a transmitter power amplifier (transmitter poweramplifier, Tx PA) of the wireless charging device (which may be referred to as the transmitter power amplifier current), such as the output current of the Tx PA, and The curve shown in the lower part of FIG. 14 can represent the rectified voltage Vrect of the wireless charging receiver 220, wherein the rectified voltage Vrect can be regarded as the rectified voltage Vrect of a specific power receiving unit among the plurality of power receiving units, for example, the specific The power receiving unit may be one of a plurality of power receiving units wirelessly charged by the power transfer unit. It should be noted that the Tx PA can be used as an example of a power amplifier of a wireless charging device. Additionally, the Tx PA current can be used as an example of the transmitter current.

As shown in Figure 14, there are some oscillations 1010 in the waveform of the Tx PA current before the pulse 1020, and these oscillations 1010 correspond to transmitter decoding (for example, the transmission board 210 can decode some wireless charging from a specific power receiving unit report and generate these oscillations accordingly), when the transmitter decoding is complete, the control circuit of the wireless charging device can generate a single pulse, such as pulse 1020 in the waveform of the Tx PA current, and treat this single pulse as The at least one simple response, in response to the at least one simple response (such as a single pulse (pulse 1020)), the rectified voltage Vrect of the specific power receiving unit can vary accordingly. Therefore, the waveform of the rectified voltage Vrect of a specific power receiving unit has a corresponding pulse 1022 in it. In this way, the control circuit of the wireless charging device may control the wireless charging device to generate at least one simple response corresponding to at least one of the plurality of packets, so as to confirm the at least one of the plurality of packets including the packet described in step 910, No information is transmitted from the wireless charging device to the electronic device through any packet. According to this embodiment, since the electronic device (especially the specific power receiving unit) does not need to decode the above-mentioned at least one simple response, the at least one simple response is indeed relatively simple, wherein the wireless charging device does not send any packet to For the electronic device, other details of this embodiment are omitted here to save space.

FIG. 15 illustrates a schematic diagram of a simple response (eg, a single pulse as described above) for the method 900 shown in FIG. 13, according to an embodiment of the present invention. For ease of understanding, the simple response control scheme shown in Figure 14 can still be applied to the power transfer unit in the above embodiments, and the control circuit of the wireless charging device can control the Tx PA current of the power transfer unit according to the waveform shown in Figure 15 to generate a single pulse.

As shown in FIG. 15, the Tx PA current can initially be maintained at the transmitter original current Itx_original. When the decoding of the transmitter is completed (for example, the power transfer unit PTU marked in Figure 15 decodes OK), the control circuit of the wireless charging device can control the Tx PA current to stay at the transmitter's nominal current Itx_nominal for a period of time, and then The Tx PA current is controlled to be 90% of the maximum current Itx_max of the transmitter for a preset time period to form a rising edge of a single pulse, wherein the preset time period may be a fixed time period ranging from 2 ms to 5 ms. Then, the control circuit of the wireless charging device can control the Tx PA current to be the transmitter original current Itx_original again to form the falling edge of the single pulse. Therefore, the single pulse can be easily and correctly detected by the electronic device (especially, the specific power receiving unit). For the sake of brevity, other details of this embodiment are omitted here.

FIG. 16 illustrates a schematic diagram of a simple response (eg, a pulse train such as a series of pulses) of the method 900 shown in FIG. 13 according to another embodiment of the present invention. For ease of understanding, except that the single pulse is replaced by a burst of pulses, the simple response control scheme shown in Figure 14 can still be applied to a power transfer unit such as that described in the embodiment shown in Figure 11, and according to the waveform shown in Figure 16 , the control circuit of the wireless charging device can control the TX PA current of the power transfer unit to generate a series of pulses.

As shown in Figure 16, the TX PA current can initially be maintained at the original current Itx_original of the transmitter, and when the decoding of the transmitter is completed (for example, the decoding of the power transmission unit marked in Figure 15 is OK), the control circuit of the wireless charging device can control The TXPA current makes it stay at the transmitter nominal current Itx_nominal for a period of time, and then controls the TX PA current to be 90% of the transmitter maximum current Itx_max for a preset time period to form the rising edge of the first pulse in the series of pulses, The preset time period may be a fixed time period in the range of 2ms to 5ms. Then, the control circuit of the wireless charging device can control the TXPA current to be the transmitter nominal current Itx_original again to form the falling edge of the first pulse in a series of pulses. The remaining pulses of a series of pulses can be generated in the same way, except that the control circuit of the wireless charging device controls the TX PA current to be the transmitter original current Itx_original to form the falling edge of the last pulse of the series of pulses. Therefore, a series of pulses can be easily and correctly detected by the electronic device (especially, the power receiving unit). For the sake of brevity, other details of this embodiment are omitted here.

FIG. 17 illustrates a schematic diagram of a simple response (such as a single pulse in the frequency domain) of the method 900 shown in FIG. 13 according to another embodiment of the present invention. For example, the control circuit of the wireless charging device can use a frequency shift keying (Frequency Shift Keying, FSK) simple response method to control a single pulse in the frequency domain, but this is just an example and not a limitation of the present invention. According to some embodiments, the control circuit of the wireless charging device may utilize other methods to control a single pulse in the frequency domain.

According to this embodiment, the control circuit of the wireless charging device can control the TX PA current to initially carry a preset frequency of 6.78 MHz, and then change to another preset frequency of 6.79 MHz in the frequency domain to form a rising edge of a single pulse in the frequency domain. Then, the control circuit of the wireless charging device can control the TX PA current to change to the preset frequency of 6.78MHz again in the frequency domain to form the falling edge of the single pulse in the frequency domain. Therefore, the single pulse can be easily and correctly detected by the electronic device (especially, the power receiving unit). For the sake of brevity, other details of this embodiment are omitted here.

According to some embodiments, the pulse in the frequency domain can be replaced by a series of pulses in the frequency domain. For example, the control circuit of the wireless charging device can control the TX PA current to initially carry a preset frequency of 6.78MHz, and then change to another frequency in the frequency domain. The frequency is preset at 6.79 MHz to form the rising edge of the first pulse in a series of pulses in the frequency domain. Then, the control circuit of the wireless charging device can control the TX PA current to change again to the preset frequency of 6.78MHz in the frequency domain to form the falling edge of the first pulse in the series of pulses. The remainder of the series of pulses can be generated in the same manner. A series of pulses in the frequency domain can be easily and correctly detected by an electronic device (in particular, a power receiving unit). For the sake of brevity, other details of this embodiment are omitted here.

According to some embodiments, a power receiving unit of the plurality of power receiving units, such as the target power receiving unit, may transmit a random delay packet containing unacknowledged header information. When decoding is complete, the power transfer unit in the embodiment shown in FIG. 15 may respond with a transmitter nominal current Itx_nominal of 2 ms with a specific pulse height (e.g. 90% of the transmitter maximum current Itx_max) and with a specific A rising pulse with a pulse width (eg, 2 milliseconds to 5 milliseconds). In addition, the power receiving unit can detect the rising or falling behavior of the rectified voltage Vrect and the related timing to determine whether the power transmitting unit allows the unconfirmed header information (such as the default header content "OVP" of the packet described in step 712 , the default header content “DN” of the packet described in step 722, the default header content “UP” of the packet described in step 732, or the default header content “OK” of the packet described in step 740). If the power receiving unit cannot detect the sudden change of the rectified voltage Vrect, the power receiving unit may repeatedly transmit random delayed packets with the same content of unacknowledged header information to ensure that the power transmitting unit can decode this information (more specifically , capable of notifying the power transfer unit of this unconfirmed information). But this is just an example, not a limitation of the present invention. Other simple acknowledgment methods that do not have complex encoding/decoding requirements to avoid false detection can be applied according to some embodiments. For example, the aforementioned burst can be used as at least one simple response in step 920 . In some examples, the control circuit of the power transfer unit can use the FSK simple response method shown in the embodiment of FIG. 7 to perform frequency modulation from the initial frequency of 6.78 MHz or to the initial frequency of 6.78 MHz. In addition, the frequency related modulation result may fall within a predetermined frequency range, wherein the predetermined frequency range may be greater than or equal to the lower limit frequency (6.78MHz-10KHz), and may be less than or equal to the upper limit frequency (6.78MHz+10KHz).

According to some embodiments, once acknowledged by the power transmitting unit, the power receiving unit may fix the packet delay time and transmit subsequent packets with acknowledged header information. In addition, when all packets are decoded with the confirmed header information, the power transfer unit can reduce the size of the detection window to be equal to the slot time of the power receiver unit. In addition, the power receiving unit can synchronize the packet delay time with the resonant frequency of the power transmitting unit to reduce the time drift between the power transmitting unit and the power receiving unit. In addition, if time synchronization is supported, the power receiving unit may transmit an unacknowledged packet after a long time (for example, a time period of 1 minute to 10 minutes or another length of time) to avoid possible false detection or time drift. The remaining details are omitted here to save space.

FIG. 18 illustrates a schematic diagram of a simple response of the method 900 shown in FIG. 13 according to another embodiment of the present invention. Compared to the simple response shown in Figure 15, the pulses within this simple response can be modified in this embodiment. For ease of understanding, the pulses within the simple response shown in Figure 15 can be considered positive-going pulses (such as pull-up pulses in the positive direction), while the pulses within the simple response shown in Figure 18 can be considered negative-going pulses (such as negative-going pull-down pulse), in this embodiment, the positive-going pulse is replaced by a negative-going pulse. Therefore, positive-going pulses and negative-going pulses can represent different meanings respectively. For example, a positive-going pulse may indicate that the power polling described in the embodiment of FIG. The power polling described in Embodiment 12 (for example, the power polling corresponding to another packet of the plurality of packets described in step 910) is rejected, and other details are omitted here to save space.

In the embodiment shown in FIG. 18, the negative going pulse may correspond to 90% of the minimum transmitter current Itx_Min within a preset time period, such as a fixed time period in the range of 2ms to 5ms. But this is just an example, not a limitation of the present invention. In some embodiments, the voltage level of the negative-going pulse is variable, and other similar details are omitted here to save space.

According to some embodiments, an output-requesting power receiving unit, such as power receiving unit 720, may transmit a packet with a rectifier power parameter P_rec (e.g., a lower power value corresponding to a lower power class) to the power transmitting unit 710, wherein the rectifier power parameter P_rec may indicate that: the power receiving unit 720 expects its rectifier to have a power equal to the rectifier power parameter P_rec. For example, the power receiving unit 720 requires a power of 10 watts (W), but the power receiving unit 720 initially requires a small power value such as 1 watt. When the power transfer unit 710 grants a request corresponding to a small power value such as 1 watt, the power receiving unit 720 may request another higher power value, such as 2 watts. And when the power transmitting unit 710 grants a request corresponding to a second power value such as 2 watts, the power receiving unit 720 may request yet another higher power value such as 3 watts. Therefore, the power receiving unit 720 can request power step by step instead of requesting a large power value at the beginning, such as 10 watts. For example, when the request of the power receiving unit 720 is granted, the power receiving unit 720 can obtain the required power from the power transmitting unit 710, and then (for example, after ten seconds), the power receiving unit 720 can transmit the corresponding The next request of the power category, and the power transfer unit 710 responds to the next request. Therefore, problems in the prior art such as system crash (system crash due to insufficient charging capability of conventional wireless charging devices) can be avoided. But this is just an example, not a limitation of the present invention. According to some embodiments, the power receiving unit 720 is able to limit the output current of its rectifier, in particular, the output current of the rectifier to the class to which the power receiving unit 720 belongs.

It should be noted that the power transmitting unit 710 can sum up the total power of the power receiving unit 720 to determine the total power parameter P_rec_max_total which is equal to the summed result. For example, when the power transmitting unit 710 wirelessly charges only one power receiving unit, such as the power receiving unit 720 , the total power parameter P_rec_max_total can be equal to the average wireless charging power. In another example, when the power transmitting unit 710 wirelessly charges multiple power receiving units, for the power receiving unit whose output is enabled, the total power parameter P_rec_max_total can be updated to (Prec_sum_ave*device_number), that is, all power receiving units The product of the average power Prec_sum_ave of the unit and the number of all power receiving units. In this way, the power transmitting unit 710 can determine whether to grant or deny the request of the power receiving unit (such as the power receiving unit 720 or any one of these power receiving units), such as the (power) Require.

In addition, when the total power parameter P_rec_max_total does not exceed the maximum category (such as the maximum power category) allowed by the power transmission unit 710, the power transmission unit 710 can respond with a nominal current (for example, the duration can be 2 milliseconds) , followed by a rising pulse (eg, the positive-going pulse) formed as a known percentage of the transmitter's maximum current Itx_Max (eg, having a duration in the range of 2 milliseconds to 5 milliseconds) to indicate: allow request The output power receiving unit (such as the power receiving unit 720 ) makes a request to open the charging port. However, when the total power parameter P_rec_max_total exceeds the maximum value of the power transfer unit 710, the power transfer unit 710 may perform a nominal current (with a duration of 2 milliseconds) and an immediate transmitter minimum current Itx_Min (for example, with a duration of 2 milliseconds to The down pulse (such as the negative pulse) formed by a known percentage within 5 milliseconds) responds to indicate that the request made by the power receiving unit (such as the power receiving unit 720 ) requesting output is rejected. In addition, the power receiving unit requesting output can detect the rising and/or falling behavior of the rectified voltage Vrect and the relevant time points to determine whether the power transmitting unit grants its request. In addition, when the power receiving unit 720 cannot detect a sudden change of the rectified voltage Vrect (for example, Vrect jumps), the power receiving unit 720 can transmit the same packet again to ensure that the power transmitting unit 710 can decode the information. But this is just an example, not a limitation of the present invention. Other simple acknowledgment methods that do not have complex encoding/decoding requirements to avoid false detection can be applied according to some embodiments. For example, the aforementioned pulse train (instead of a single pulse) can be used as at least one simple response in step 920 . In some examples, the control circuit of the power transfer unit can use the FSK simple response method taught by the embodiment of FIG. 17 to perform frequency modulation from or to the initial frequency of 6.78 MHz. In addition, the relevant frequency modulation result can fall within a preset frequency range, wherein the preset frequency range can be greater than or equal to the lower limit frequency (6.78MHz-10KHz), and can be less than or equal to the upper limit frequency (6.78MHz+10KHz).

According to some embodiments, the power transfer unit 710 can operate according to the power transfer unit detection control scheme to avoid crash of the power receiving unit that cannot support the power adjustment function. For example, when the transmitter power amplifier reaches its maximum output, the power transfer unit 710 can detect whether the transmitter current Itx continues to drop. If the above conditions are met for a certain number of times, the power transfer unit 710 may enter a latch fault state to notify the user that the power receiving unit needs to be removed from the power transfer unit 710 . For example, the power transfer unit 710 can operate according to the foreign object detection control scheme disclosed in some embodiments above to determine whether the power receiving unit has been removed from the power transfer unit 710, and other similar details are omitted here. To save space.

Those of ordinary skill in the art will readily notice that numerous modifications and variations can be made to the apparatus and methods of the present invention while maintaining the teachings of the present invention. Accordingly, the above disclosure should be construed as being limited only by the scope of the claims of the present application.

Claims (16)

1. a kind of method for the wireless charging control for executing electronic device, wherein the simple response by means of wireless charging device comes Wireless charging control is executed, wherein the wireless charging device is wirelessly to charge to the electronic device, this method comprises:

An at least package is received from the electronic device, wherein wireless charging telegram of at least package to carry the electronic device The information of announcement；And

Control the wireless charging device with generate at least one simple response without by any package from the wireless charging device to The electronic device transmits information, and to confirm an at least package, wherein at least one simple response includes in time domain or frequency domain Pulse.

2. the method as described in claim 1, which is characterized in that the wireless charging device does not transmit any package to the electronics and fills It sets, to confirm an at least package.

3. the method as described in claim 1, which is characterized in that an at least package includes at least random phase delay envelope Packet, wherein each random phase delay package at least random phase delay package has the random phase relative to time slot Position delay, and the letter that at least random phase delay package is reported to carry an at least wireless charging for the electronic device Breath.

4. the method as described in claim 1, which is characterized in that the electronic device detects at least one simple response and should At least one simple response is considered as the confirmation to an at least package, without executing decoding at least one simple response.

5. the method as described in claim 1, which is characterized in that at least one simple response includes direct impulse.

6. method as claimed in claim 5, which is characterized in that at least one simple response further comprises negative-going pulse, and The direct impulse and the negative-going pulse indicate respectively different meanings.

7. method as claimed in claim 6, which is characterized in that an at least package includes multiple envelopes from the electronic device Packet；And the power poll of the package corresponded in multiple package is permitted in direct impulse instruction, and the negative-going pulse refers to Show the power poll for another package that refusal corresponds in multiple package.

8. the method as described in claim 1, which is characterized in that at least one simple response includes negative-going pulse.

9. a kind of device for the wireless charging control for executing electronic device, wherein the simple response by means of wireless charging device comes Wireless charging control is executed, wherein for the wireless charging device wirelessly to charge to the electronic device, which includes should At least part of wireless charging device, the device include:

Conveyer is located in the wireless charging device, and wherein the conveyer is to output transport electric current；And

Control circuit in the wireless charging device and is coupled to the conveyer, and wherein the control circuit is arranged to pass through The power output coil of the wireless charging device receives an at least package from the electronic device, and wherein an at least package is to hold The information of the wireless charging report of the electronic device is carried, wherein the control circuit is further configured to control the wireless charging Denso Set with by using the conveyer generate at least one simple response without by any package from the wireless charging device to the electricity Sub-device transmits information, and to confirm an at least package, wherein at least one simple response includes the pulse in time domain or frequency domain.

10. device as claimed in claim 9, which is characterized in that the wireless charging device does not transmit any package to the electronics Device, to confirm an at least package.

11. device as claimed in claim 9, which is characterized in that an at least package includes at least random phase delay envelope Packet, wherein each random phase delay package at least random phase delay package has the random phase relative to time slot Position delay, and the letter that at least random phase delay package is reported to carry an at least wireless charging for the electronic device Breath.

12. device as claimed in claim 9, which is characterized in that the electronic device detects at least one simple response and should At least one simple response is considered as the confirmation to an at least package, without executing decoding at least one simple response.

13. device as claimed in claim 9, which is characterized in that at least one simple response includes direct impulse.

14. device as claimed in claim 13, which is characterized in that at least one simple response further comprises negative-going pulse； And the direct impulse and the negative-going pulse indicate respectively different meanings.

15. device as claimed in claim 14, which is characterized in that at least a package includes from the multiple of the electronic device for this Package；And power poll of the direct impulse instruction allowance corresponding to a package in multiple package, and the negative-going pulse Indicate the power poll for another package that refusal corresponds in multiple package.

16. device as claimed in claim 9, which is characterized in that at least one simple response includes negative-going pulse.