CN102904475B - Inductive power supply and metal foreign object detection method thereof - Google Patents

Abstract

The invention discloses an induction type power supply, which is used for carrying out induction power transmission work and detecting whether a metal foreign body exists or not, and comprises a processing module, a control module and a feedback module, wherein the processing module is used for generating a control signal according to default data and a feedback signal; a driving module for converting a stable voltage source into a driving voltage according to the control signal; an induction coil for electrically transmitting the driving voltage to perform the inductive power transfer operation; the feedback module is used for generating the feedback signal according to the driving voltage received by the induction coil; the default data is an initial state of the inductive power supply and includes a sine wave amplitude corresponding to the driving voltage in the initial state, and the metal foreign object affects a sine wave amplitude corresponding to the feedback signal.

Description

Inductive power supply and metal foreign object detection method thereof

technical field

The present invention relates to an inductive power supply and a metal foreign object detection method thereof, in particular to an inductive power supply capable of performing an inductive power transmission and detecting whether there is a metal foreign object at the same time and a metal foreign object detection method thereof .

Background technique

In the known art, the most important problem related to electromagnetic induction power system is that it must be able to adaptively identify a rechargeable device placed on a transmitter coil waiting for the operation of inductive power transfer, in which the operation similar to that of an induction cooker for cooking will be used The principle is to generate high-power electromagnetic wave energy for inductive power transmission. During the working process, when the high-power electromagnetic wave energy is received by a foreign metal, the foreign metal will be heated due to the electromagnetic induction effect and cause dangerous doubts. In this case, manufacturers developing electromagnetic induction power systems will devote themselves to the development of induction technology that can identify targets. Among them, the technology of induction coils is generally used, that is, to establish a wireless data signal transmission between a power receiving end and a power supply end. And use a receiving coil at the power receiving end to feed back the data signal, and at the same time use a transmitting coil at the power supply end to receive the data signal. In this case, a relatively effective wireless transmission method can be provided to complete the communication between the power receiving end and the power supply end. Wireless data transmission and inductive power transfer work.

However, when various manufacturers want to carry out inductive power transmission and wireless data transmission at the same time, because inductive power transmission is usually carried out by a high-power main carrier wave, it is easily interfered by various signals in the external environment, and it is difficult At the same time achieve wireless data transmission. There are also other manufacturers that combine another wireless data transmission work with the existing inductive power transmission work, such as establishing wireless data transmission through infrared, bluetooth, RFID tags, WiFi, etc., but need to add a corresponding wireless transmission module. This increases production costs and reduces market acceptance. Therefore, the current market still tends to choose induction coils and use a more efficient transmission mechanism to perform inductive power transmission and wireless data transmission at the same time.

It is worth noting that under different inductive power transmission operations and wireless data transmission, a detection signal must be used on the power supply end to identify whether the rechargeable device at the power receiving end is correct before starting to provide inductive power transmission. In other words, when the user places a metal foreign object (such as a coin, key, paper clip, etc.) In this case, the inductive power transmission at the power supply end will not be activated to avoid the danger of heating metal foreign objects. However, there is still a defect in the above technology, that is, when the power supply terminal determines that there is a rechargeable device, and there is a metal foreign object between the power supply terminal and the power receiving terminal that partially covers the interaction area between the transmitting coil and the receiving coil, in this case, The power supply end and the power receiving end will conduct wireless data transmission through the unshielded area, so that the metal foreign objects may be heated due to absorbing part of the electromagnetic energy and cause danger.

In view of the above problems, the corresponding solution has been proposed in the invention patent specification of Taiwan Patent Publication No. TW 201143250 "Input Parasitic Metal Detection", which is to analyze the difference between the input power of the power supply end and the output power of the power receiving end as the power loss Value, by judging excessive power loss as a metal foreign object, and then performing safety control of power off. However, the power loss is not only caused by metal foreign objects. When the relative position of the power supply coil and the power receiving coil is shifted, the power loss will also increase. Therefore, the technology of this invention needs to first define the transmission/reception coil and other power conversion components. The power loss data, or the power loss data corresponding to all possible metal foreign objects are measured in advance as a basis for judgment, and then compared according to the actual power loss changes detected during operation. However, it is still necessary to default the settings of different parameters such as driving voltage, component characteristics, and coil specifications before performing this method. If the above-mentioned default parameters are changed during use, it will need to be reset, which makes the design of this method inflexible. It is not easy to correctly judge whether there is abnormal metal. In addition, this method still needs to install a current detection circuit at the power supply end and the power receiving end to calculate the value of current and voltage to measure the power change of the power supply end and the power receiving end, but the above current detection circuit may not be able to accurately measure Measure the actual power consumption changes, and the power changes at the receiving end also need to be transmitted to the power supply end through wireless signal transmission for calculation. Whether the signal transmission can be completed synchronously for subsequent calculations may also cause errors and cannot be accurately judged Whether there is the presence of metal foreign objects.

Therefore, it has become an important subject in this field to provide a more efficient inductive power supply and a method for detecting metal foreign objects, which can simultaneously perform inductive power transmission and detect whether there are metal foreign objects.

Contents of the invention

Therefore, the main objective of the present invention is to provide an inductive power supply capable of simultaneously performing inductive power transmission and detecting whether there is a metal foreign object and a metal foreign object detection method thereof.

The invention discloses an inductive power supply, which is used for inductive power transmission and detecting whether there is a metal foreign object. The inductive power supply includes an input power module for receiving a stable voltage source; a storage module , used to store a default data; a processing module, coupled to the input power supply module and the storage module, used to generate a control signal according to the default data and a feedback signal; a driving module, coupled to the input power supply The module and the processing module are used to convert the stable voltage source into a driving voltage according to the control signal; an induction coil is coupled to the driving module and used to electrically transmit the driving voltage to a power receiving device for performing the Inductive power transmission work; and a feedback module, coupled to the induction coil, used to generate the feedback signal according to the driving voltage received by the induction coil; wherein, the default data is an inductive power supply The initial state includes a sine wave amplitude corresponding to the driving voltage in the initial state, and if there is the metal foreign object during the inductive power transmission, it will affect the sine wave amplitude corresponding to the feedback signal, making the processing The module generates the control signal correspondingly.

The present invention also discloses a method for an inductive power supply. The inductive power supply includes a processing module, an induction coil and a default data for performing an inductive power transmission operation while detecting the inductive power supply Whether there is a metal foreign object in the supplier, the method includes switching the inductive power supply between a setting operation and an inductive power transmission operation according to a control signal; and when the inductive power supply performs the setting When working, the processing module performs a first workflow, and when the inductive power supply performs the setting work, the processing module performs a second workflow; wherein, the default data is the inductive power supply An initial state of the power supply, and form an initial look-up table, the first work flow is to modify the initial look-up table of the inductive power supply to form a modified look-up table, the second work flow is to modify the look-up table according to to detect whether the metal foreign object exists in the inductive power supply.

Description of drawings

FIG. 1 is a schematic diagram of an inductive power supply according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an amplitude curve correspondingly generated by a capacitor and an induction coil in an embodiment of the present invention.

3 is a schematic diagram of different amplitude curves correspondingly generated by capacitors and induction coils under different stable voltage sources in an embodiment of the present invention.

4 is a schematic diagram of different amplitude curves generated when the equivalent capacitance and equivalent inductance of the capacitor and the induction coil change in an embodiment of the present invention.

FIG. 5 is a schematic diagram of the amplitude curves of the capacitance and the induction coil with a default error range in the embodiment of the present invention.

FIG. 6 is a schematic diagram of another inductive power supply according to an embodiment of the present invention.

FIG. 7 is a flowchart of a handover process according to Embodiment 1 of the present invention.

FIG. 8 is a flow chart of the first working process of Embodiment 1 of the present invention.

FIG. 9 is a flow chart of the second workflow of Embodiment 1 of the present invention.

Wherein, the reference signs are explained as follows:

10, 60 Inductive power supply

100 input power module

1000 receiving units

102 storage module

104 processing module

106 drive module

1060 driver unit

108 induction coil

110 Feedback Module

1110 The first detection unit

1112 Second detection unit

600 Switching Module

602 Prompt module

70 Switch process

700, 702, 704, 706, 800, 802, 804, steps

806, 808, 810, 900, 902, 904, 906,

908, 910

80 The first workflow

90 Second Workflow

A1, A2, A3, A4, A2_H, A2_L Sine wave amplitude

Amax, A1max～A4max Maximum sine wave amplitude

A2_D Lower limit sine wave amplitude

A2_U Upper limit sine wave amplitude

CD, CD1 Program code

F0, F1, F2, F3, F4 Working clock

R1, R2 Resistors

SW1, SW2 Switching transistors

S_C Control Signal

S_DV, V1～V4 Driving voltage

S_DV2 resonant sine wave

S_FB, S_FB1 Feedback signal

S_IS Initial state

VIN Input Voltage

VS Stabilized voltage source

W0, W0_H, W0_L, W1～W4 amplitude curve

W0_D lower limit amplitude curve

W0_U upper limit amplitude curve

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of an inductive power supply 10 according to an embodiment of the present invention. As shown in FIG. 1 , the inductive power supply 10 includes an input power module 100 , a storage module 102 , a processing module 104 , a driving module 106 , an induction coil 108 and a feedback module 110 . In detail, the input power module 100 is coupled to the processing module 104 and the driving module 106 and receives a stable voltage source VS, and then divides the voltage through the resistors R1 and R2 to convert the stable voltage source VS into a lower voltage VIN is sent to the processing module 104 as a reference for subsequent work, and directly provides the stable voltage source VS to the drive module 106. At the same time, a receiving unit 1000 of the input power module 100 converts the stable voltage source VS to the processing module 104 as power used. The storage module 102 includes an initial state S_IS, and the initial state S_IS is a default value of a plurality of parameters before the inductive power supply 10 performs an inductive power transmission operation. The processing module 104 is coupled to the storage module 102 and the feedback module 110 for receiving default values of multiple parameters in the initial state S_IS and a feedback signal S_FB generated by the feedback module 110 to correspondingly generate a control signal S_C to the driving module 106 . A driving unit 1060 of the driving module 106 is used to receive the control signal S_C to control the conduction of the switching transistors SW1 and SW2 correspondingly, and then convert the stable voltage source VS into a driving voltage S_DV, and then convert it into a resonant string by a capacitor C The wave S_DV2 is transmitted through the induction coil 108 to perform electromagnetic wave transmission, so as to transmit power and at the same time, the receiving end feeds back the main carrier wave of the data signal. Preferably, the induction coil 108 includes an equivalent inductance value, which uses electromagnetic wave induction to induce the drive voltage S_DV to be transmitted to a power receiving terminal (not shown in the figure), such as a rechargeable product for inductive power supply Inductive power transmission between the device 10 and the rechargeable product. The feedback module 110 is coupled to the induction coil 108 and includes a first detection unit 1110 and a second detection unit 1112, wherein the first detection unit 1110 detects a change in the amplitude of a sine wave corresponding to the driving voltage S_DV and converts it into a feedback The signal S_FB is transmitted to the processing module 104, and the feedback signal S_FB is a voltage signal representing the resonant sine wave S_DV2 used by the induction coil 108. As for the second detection unit 1112, it simultaneously detects a feedback data signal from the power receiving end, and converts it into Another feedback signal S_FB1 is transmitted to the processing module 104 , that is, the feedback signal S_FB1 represents the feedback data signal from the receiving end.

To put it simply, in this embodiment, according to whether there is a metal foreign object in the inductive power supply 10 , the amplitude of the resonant sine wave S_DV2 corresponding to the stable voltage source VS will have different changes. Accordingly, the storage module 102 of this embodiment pre-stores an initial sine wave amplitude corresponding to the driving voltage S_DV in which the inductive power supply 10 is turned on but not electrically connected to any rechargeable electronic product as the initial state S_IS, When the inductive power supply 10 and the rechargeable product are inductively transmitting power, the feedback module 110 will further convert the variation of the amplitude of the resonant sine wave S_DV2 corresponding to the stable voltage source VS into the feedback signal S_FB , and then the processing module 104 compares the difference in the amplitude of the sine wave between the initial state S_IS and the feedback signal S_FB, and further serves as a judging mechanism for whether the inductive power supply 10 performs inductive power transmission.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of an amplitude curve corresponding to the capacitance C and the induction coil 108 in the embodiment of the present invention, wherein the amplitude curve is displayed on a two-dimensional coordinate, and the two-dimensional coordinate uses multiple operating clocks as Its X-axis uses a plurality of sine wave amplitudes as its Y-axis, and the capacitor C and the induction coil 108 work at the driving voltage S_DV. As shown in Figure 2, since the capacitor C and the induction coil 108 can be equivalently regarded as a composition of an induction capacitance and an induction inductance, and the equivalent capacitance value and the equivalent inductance value corresponding to the induction capacitance and the induction inductance respectively, using the input The stable voltage source VS received by the power module 100 is driven by the switching power supply clock generated by the driving module 106 to generate a resonant sine wave S_DV2, which can be drawn in two-dimensional coordinates to generate an amplitude curve corresponding to a capacitance-inductance matching of the induction coil 108 W0, where the amplitude curve W0 contains a maximum sine wave amplitude Amax and corresponds to a working clock F0, and for the convenience of work, when setting the working clock to work on the amplitude curve W0, the user usually uses a value greater than the working clock F0 to avoid the maximum The amplitude of the sine wave causes the system to be overloaded and damaged, for example, the working clocks F1 , F2 , F3 , and F4 shown in FIG. 2 can correspond to the amplitudes of the sine wave A1 , A2 , A3 , and A4 respectively.

Please refer to FIG. 3 again. FIG. 3 is a schematic diagram of different amplitude curves W1-W4 corresponding to the capacitor C and the induction coil 108 under different driving voltages V1-V4 generated by different stable voltage sources VS in the embodiment of the present invention, wherein the driving voltage V1 ~V4 is an increasing sequence. As shown in Figure 3, when the driving voltage is gradually increased from V1 to V4, the maximum sine wave amplitudes A1max to A4max of the amplitude curves W1 to W4 corresponding to the working clock F0 are also translated upward along the Y axis and increased. Of course, if The same incrementing situation also exists for different working clocks, for example, working clock F2. In this case, in this embodiment, according to different stable voltage sources VS and different working clocks, the numerical values of the corresponding sine wave amplitudes on different amplitude curves W1-W4 can be established, and then a look-up table can be formed and stored in The module 102 is correspondingly stored by a non-volatile memory (Non-volatile memory, NVRAM), such as EEPROM.

Please refer to FIG. 4 again. FIG. 4 is a schematic diagram of different amplitude curves generated when the equivalent capacitance and inductance of the capacitor C and the induction coil 108 vary according to the embodiment of the present invention. As shown in FIG. 4 , which is similar to the embodiment shown in FIG. 2 , the induction coil 108 is also operated under the driving voltage S_DV, and the fixed working clock F2 will have a sine wave amplitude A2 on the amplitude curve W0. Accordingly, when the capacitance C and the equivalent capacitance and inductance of the induction coil 108 increase, another amplitude curve W0_H will be generated correspondingly, or it can be considered that the amplitude curve W0 shifts to the left to become the amplitude curve W0_H. Under the working clock F2, the amplitude curve W0_H will produce another sine wave amplitude A2_H and is smaller than the sine wave amplitude A2, and when the equivalent capacitance value and the equivalent inductance value of the capacitor C and the induction coil 108 are reduced, another amplitude curve W0_L It will be generated correspondingly, or it can be regarded as the amplitude curve W0 is shifted to the right to become the amplitude curve W0_L. Observe that under the fixed working clock F2, the amplitude curve W0_L will generate another sine wave amplitude A2_L which is greater than the sine wave amplitude A2. It is worth noting that if there is a metal foreign object between the inductive power supply 10 and the rechargeable product at the power receiving end, that is, the metal foreign object is located on an image plane where the induction coil 108 interacts with the rechargeable product, but it is not completely When blocking the inductive power transmission and wireless signal transmission between the two, the metal foreign object will absorb part of the electromagnetic wave energy to reduce the equivalent inductance value, thereby increasing the corresponding sine wave amplitude. Therefore, in this embodiment, according to the change of the amplitude of the sine wave corresponding to the induction coil 108, it can be judged whether there is a metal foreign object between the inductive power supply 10 and the rechargeable product at the power receiving end, so as to determine whether to continue the inductive power supply. Judgment mechanism for charging work.

Preferably, the inductive power supply 10 provided by the present invention can also be used for rechargeable products whose induction coil 108 is not electrically coupled to any power receiving end, and is directly detected by the first detection unit 1110 of the feedback module 110 The variation of the amplitude of the resonant sine wave S_DV2 to determine whether any metal foreign matter enters the range of the inductive charging operation of the inductive power supply 10 is also within the scope of the present invention.

Please refer to FIG. 5 , which is a schematic diagram of the amplitude curve of the induction coil 108 with a default error range in the embodiment of the present invention. As shown in FIG. 5, continuing the embodiment shown in FIG. 2, the induction coil 108 is also operated under the driving voltage S_DV, and the fixed working clock F2 has a sine wave amplitude A2 observed on the amplitude curve W0. In addition, according to According to different user requirements or default conditions of the inductive power supply 10, the amplitude curve W0 is shifted upward or downward to form another upper limit amplitude curve W0_U and another lower limit amplitude curve W0_D respectively, and there is an upper limit corresponding to the fixed working clock F2 A sine wave amplitude A2_U and a lower limit sine wave amplitude A2_D. In this case, the upper limit sine wave amplitude A2_U and the lower limit sine wave amplitude A2_D will correspond to the error range formed on the amplitude curve W0 under the fixed working clock F2, that is, the inductive power supply 10 can make corresponding judgments during the inductive power transmission operation. Whether the change of the sine wave amplitude corresponding to the induction coil 108 exceeds the error range, that is, whether the change of the sine wave amplitude is greater than the upper limit sine wave amplitude A2_U or less than the lower limit sine wave amplitude A2_D, to determine whether there is a metal foreign object intervening in the inductive power supply Between the supplier 10 and the rechargeable product at the power receiving end, it is used as a judging mechanism for whether to continue the inductive charging operation. Further, in this embodiment, the above-mentioned W0 on the fixed amplitude curve can be fixed as the error range of the working clock F2, combined with the look-up table in the embodiment of Figure 3, and analogously applicable to different amplitude curves, different working clocks and different stable The voltage source can correspond to multiple error ranges, and can be stored in the non-volatile memory of the storage module 102 as a judging mechanism for whether the inductive power supply 10 continues to perform inductive charging during operation.

Please refer to the embodiments described in FIGS. 1 to 5 at the same time. The inductive power supply 10 provided by the present invention is pre-stored by the storage module 102 with the look-up table of the embodiment in FIG. 3 combined with FIG. 5 to form an error range lookup Table, in order to obtain multiple error ranges under different amplitude curves, different working clocks and different stable voltage sources, and then provide the corresponding initial state S_IS of the rechargeable product under a specific stable voltage source VS, and then detect the induction through the feedback module 110 The voltage of the resonant sine wave S_DV2 of the coil 108 is the feedback signal S_FB, and then the difference in the amplitude of the sine wave between the initial state S_IS and the feedback signal S_FB is compared in the processing module 104 at the same time, and further used as whether the inductive power supply 10 performs induction power Judgment mechanism for transfer work.

Please refer to FIG. 6 , which is a schematic diagram of another inductive power supply 60 according to an embodiment of the present invention. As shown in Figure 6, the processing module 104 can also be coupled to a switching module 600 and a prompt module 602, and the storage module 102 has stored a program code CD, so that the processing module 104 can execute the above program code through a frequency conversion method, corresponding Obtain the initial operating voltage data or operating clock and other related parameter values of the induction coil 108 of the inductive power supply 60, and form an initial lookup table containing the initial state S_IS of the inductive power supply 60, and this frequency conversion method has been established in Taiwan It is proposed in the invention patent specification of patent publication number TW 201123675 "Power transmission method of high-power wireless inductive power supply", and will not be repeated here. In addition, the storage module 102 also contains another program code CD1, and the processing module 104 of the inductive power supply 60 executes the program code CD1 to determine whether the current inductive power supply 60 needs to perform setting work. Or the above-mentioned inductive power transmission work, in this embodiment, the above switching mechanism is pre-stored in the processing module 104 or the storage module 102, so as to control the processing module 104 to perform the switching work of the two. Of course, the above switching mechanism can also receive a control signal (not shown) input by the user through a switching module 600 correspondingly, and use the switching processing module 104 to determine whether to perform setting work or induction power transmission workers, It is also within the scope of the present invention.

Further, the switching mechanism applicable to the inductive power supply 60 can be summarized into a switching process 70 , please refer to FIG. 7 . The switching process 70 includes the following steps:

Step 700: start.

Step 702: According to the control signal of the switch module 600, switch the inductive power supply 60 between the setting operation and the inductive power transmission operation.

Step 704: When the inductive power supply 60 is performing the setting operation, the processing module 104 executes the program code CD1 to perform a first workflow; when the inductive power supply 60 is performing the inductive power transmission operation, the processing module 104 Execute the program code CD1 to perform a second workflow.

Step 706: end.

In addition, the working details of the first working process 80 in step 704 can be referred to as shown in FIG. 8 . The first workflow 80 includes the following steps:

Step 800: start.

Step 802 : Use the resistors R1 and R2 to divide the voltage of the stable voltage source VS to transmit a first divided voltage value to the processing module 104 .

Step 804: The processing module 104 stores the first divided voltage value in the storage module 102, and uses the first divided voltage value as a data header to establish an error range lookup table.

Step 806 : According to the first divided voltage value, the processing module 104 correspondingly sets a working clock value as the highest working clock value of the inductive power supply 60 .

Step 808: The driving module 106 receives the operating clock value set by the processing module 104 to generate the driving voltage S_DV correspondingly, and the first detection unit 1110 converts the voltage value of the resonant sine wave S_DV2 into a feedback signal S_FB to be stored in the memory Module 102.

Step 810 : According to the voltage value of the resonant sine wave S_DV2 , the processing module 104 determines whether the feedback signal S_FB exceeds the maximum working voltage value of the feedback module 110 . If it exceeds (or is equal to) the maximum operating voltage value of the feedback module 110, the processing module 104 restarts the work of the switching process 70; The working clock value set under the pressure value is used to repeat step 808.

Please refer to the switching process 70 and the first working process 80 at the same time, and the storage module 102 has stored the error range lookup table (ie including the initial state S_IS of the inductive power supply 60 ). In step 802, when the inductive power supply 60 enters the setting operation, the resistors R1 and R2 of the input power module 100 will divide the voltage of the stable voltage source VS, and transmit the first divided voltage value after division. to the processing module 104. In step 804, the first divided voltage value is transmitted from the processing module 104 to the storage module 102 for storage, and in this embodiment, the storage module 102 is corresponding to establish the first divided voltage value as an error range lookup table A data header for subsequent lookups. In step 806, the processing module 104 (or according to the control signal of the switching module 600) correspondingly sets the operating clock value under the first divided voltage value to the current highest operating clock value (or higher) of the inductive power supply 60 working clock value). In step 808, the processing module 104 transmits the set working clock value to the driving module 106, so that the driving module 106 outputs the driving voltage S_DV to drive the capacitor C and the induction coil 108 to generate a resonant sine wave S_DV2, and the feedback module 110 The first detection unit 1110 also converts the voltage value of the resonant sine wave S_DV2 to a feedback signal S_FB, which is sent back to the processing module 104 and stored in the storage module 102 . In step 810, the processing module 104 judges whether the feedback signal S_FB exceeds (or is equal to) the maximum operating voltage value of the feedback module 110 according to the voltage value of the resonant sine wave S_DV2, if the current voltage value exceeds (or is equal to) the feedback module 110 The highest operating voltage value, the processing module 104 can stop the current setting work through a stop signal (not shown in the figure), and return to the work of the switching process 70; if the current voltage value does not exceed (that is, be lower than) the feedback For the highest working voltage value of the module 110, the processing module 104 reduces the working clock value set under the current first divided voltage value, and repeats step 808 to record the voltage value of the resonant sine wave corresponding to the next clock.

Therefore, after multiple data storages, in addition to pre-writing the initial state S_IS of part of the inductive power supply 60 in the storage module 102, the amplitude curve under the current stable voltage source VS can also be adaptively established, and the usage can be provided accordingly. The operator can further input different stable voltage sources VS to establish multiple amplitude curves in the error range lookup table. In other words, the user can obtain the corresponding vibrating wave voltage values and multiple error ranges corresponding to different clocks and different stable voltage sources (that is, to create multiple data headers and their data contents in the error range lookup table) , and at the same time, different parameter data can be added to the error range lookup table adaptively according to user needs, thereby providing the modified initial state corresponding to the inductive power supply 60 of the rechargeable product under a specific stable voltage source VS S_IS.

In addition, the working details of the second working process 90 in step 704 can be referred to as shown in FIG. 9 . The second workflow 90 includes the following steps:

Step 900: start.

Step 902 : Use the resistors R1 and R2 to divide the voltage of the stable voltage source VS to transmit a second divided voltage value to the processing module 104 .

Step 904: The processing module 104 judges whether the second divided voltage value is consistent with multiple data headers in the error range lookup table in the storage module 102. If not, the processing module 104 restarts the work of the switching process 70 ; if they match, the processing module 104 proceeds to step 906 .

Step 906: The driving module 106 receives the operating clock value set by the processing module 104 to generate the driving voltage S_DV correspondingly, and the first detection unit 1110 transmits the voltage value of the resonant sine wave S_DV2 to the processing module 104, and the processing module 104 According to the currently set working clock, the resonant sine wave corresponding to the working clock in the storage module 102 is captured.

Step 908: The processing module 104 judges whether the amplitude difference of a sine wave between the resonant sine wave S_DV2 and the resonant sine wave corresponding to the working clock exceeds a default error range. If the default error range is not exceeded, the processing module 104 restarts the operation of the switching process 70 ; if the default error range is exceeded, the processing module 104 stops the inductive power transmission operation of the inductive power supply 60 .

Step 910: end.

Please refer to the switching process 70 and the second working process 90 at the same time, and the storage module 102 has included the modified error range lookup table. In step 902, when the inductive power supply 60 enters the inductive power transmission operation, the resistors R1 and R2 of the input power module 100 will divide the stable voltage source VS, and divide the second divided voltage value sent to the processing module 104. In step 904 , the processing module 104 will preliminarily determine whether the second divided voltage value matches the plurality of data headers in the error range lookup table. If the second divided voltage value is not consistent with any of the multiple data headers, the processing module 104 will return to step 702 of the switching process 70; if the second divided voltage value is consistent with one of the multiple data headers, the processing Module 104 will proceed to step 906 . In step 906, the driving module 106 receives the operating clock value set by the processing module 104 to generate the corresponding driving voltage S_DV, and the first detection unit 1110 sends the voltage value of the resonant sine wave S_DV2 back to the processing module 104, and simultaneously processes The module 104 also retrieves the resonant sine wave corresponding to the working clock in the storage module 102 according to the currently set working clock for subsequent comparison work. In step 908 , the processing module 104 determines whether the amplitude difference between the resonant sine wave S_DV2 and the resonant sine wave corresponding to the working clock exceeds a default error range. If the sine wave amplitude difference between the two does not exceed the default error range, the processing module 104 will return to step 702 of the switching process 70; if the sine wave amplitude difference between the two has exceeded the default error range, the processing module 104 Another stop signal (not shown in the figure) will be generated to stop the inductive power supply 60 from continuing to perform the inductive power transmission.

In addition, in step 908, when the processing module 104 determines that the inductive power supply 60 stops the inductive power transmission, the prompt module 602 will also correspondingly generate a prompt signal (not shown in the figure), such as a voice signal Or a light signal, etc., and then inform the user that there may be metal foreign objects in the inductive power supply 60, or the working mode of the inductive power supply 60 may be abnormal, and the user needs to perform a manual correction. Of course, those skilled in the art can also modify or add other prompting mechanisms and corresponding circuit modules, so that in addition to prompting the user, the inductive power supply 60 can also correspond to the display mode through a display panel to inform The location where abnormalities may occur in the user-sensing power supply 60 or its corresponding components are also within the scope of the present invention. Of course, those skilled in the art can also add other switching mechanisms (switching signals) according to user needs, so as to add different workflows before and after the first workflow 80 and the second workflow 90, so as to suitably Completion of different workers is also within the scope of the present invention.

In this embodiment, the initial state S_IS pre-stored in the storage module 102 (that is, the user has pre-stored relevant parameters in the storage module 102 to form an initial error range lookup table), and according to the control signal of the switching module 600 Adaptively collaborating with the first working process 80, in the actual work of the inductive power supply 60, a plurality of error ranges corresponding to different amplitude curves, different working clocks and different stable voltage sources and related settings of the power receiving end are added. (such as the change of different capacitance matching curves of different induction coils), so that users can obtain the relevant data of the actual measurement in the actual work process, and then modify/add the initial error range lookup table (that is, the initial state S_IS) Content. Preferably, the embodiments provided by the present invention do not further limit the working mechanism of wireless signal transmission, so those skilled in the art can add other controls between the setting work and the inductive power transmission work according to different needs. Processes/signals for correspondingly judging whether to perform wireless signal transmission, so that the inductive power supply 10, 60 can simultaneously perform inductive power transmission and wireless signal transmission are within the scope of the present invention.

To sum up, the embodiments of the present invention provide an inductive power supply and a method for detecting metal foreign objects, so as to simultaneously detect whether there are metal foreign objects during inductive power transmission. In other words, this embodiment is to judge the difference between the corresponding sinusoidal amplitude in the feedback signal and the corresponding sinusoidal amplitude in the initial state of the inductive power supply, when the difference between the two has been When the error range is exceeded, the inductive power supply will stop the inductive power transmission to avoid foreign metal objects entering the gap between the inductive power supply and the rechargeable device at the power receiving end during the inductive power transmission, so as to prevent the metal foreign objects from overheating and causing damage. There are dangerous doubts.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (23)

1. An inductive power supply for performing an inductive power transmission and detecting whether there is a metal foreign object, characterized in that the inductive power supply includes: An input power module, used to receive a stable voltage source; A storage module, used to store a default data; a processing module, coupled to the input power supply module and the storage module, for generating a control signal according to the default data and a feedback signal; a driving module, coupled to the input power module and the processing module, for converting the stable voltage source into a driving voltage according to the control signal; an induction coil, coupled to the driving module, is used to electrically transmit the driving voltage to a power receiving device for the inductive power transmission; and a feedback module, coupled to the induction coil, for generating the feedback signal according to the driving voltage received by the induction coil; Wherein, the default data is an initial state of the inductive power supply and includes a sine wave amplitude corresponding to the driving voltage in the initial state, and if there is the metal foreign object during the inductive power transmission, it will be A sine wave amplitude corresponding to the feedback signal is affected, so that the processing module correspondingly generates the control signal to stop the inductive power transmission operation. 2. The inductive power supply according to claim 1, wherein the induction coil is further coupled to a capacitor to include an equivalent capacitance and an equivalent inductance, and the initial state is based on the equivalent The capacitance value and the equivalent inductance value form an amplitude curve on a two-dimensional coordinate including a plurality of operating clocks and a plurality of sine wave amplitudes, and a horizontal axis of the two-dimensional coordinate is the plurality of operating clocks and the A vertical axis of the two-dimensional coordinates is the amplitude of the plurality of sine waves. 3. The inductive power supply as claimed in claim 2, wherein on the two-dimensional coordinates, when the driving voltage is increased, the amplitude curve is translated upward along the longitudinal axis and the amplitude curve is A maximum sine wave amplitude is increased. 4. The inductive power supply as claimed in claim 2, wherein when the equivalent capacitance and the equivalent inductance increase, a string corresponding to the amplitude curve under the fixed operating clock The wave amplitude decreases, and when the equivalent capacitance value and the equivalent inductance value decrease, the amplitude of a sine wave corresponding to the amplitude curve increases under the fixed working clock. 5. The inductive power supply as claimed in claim 2, wherein when the metal foreign object is located on a mapping plane of the induction coil, the amplitude of the sine wave of the feedback signal at each operating clock is increasing. 6. The inductive power supply as claimed in claim 5, wherein the storage module further comprises a program code for judging the difference between the sinusoidal amplitude of the feedback signal and the sinusoidal amplitude of the default data Whether the difference exceeds an error range. 7. The inductive power supply as claimed in claim 6, wherein the storage module is used to store a lookup table, and the lookup table includes the plurality of working clocks and the plurality of the two-dimensional coordinates The amplitude of the sine wave and the error range corresponding to each of the multiple working clocks and each of the multiple amplitudes of the sine wave. 8. The inductive power supply as claimed in claim 6, wherein when the difference between the sinusoidal amplitude of the feedback signal and the sinusoidal amplitude of the default data is greater than the error range, the processing The module generates a first stop signal to make the inductive power supply stop the inductive power transmission. 9. The inductive power supply as claimed in claim 6, further comprising a prompt module, when the difference between the sinusoidal amplitude of the feedback signal and the sinusoidal amplitude of the default data is greater than the When within the error range, the prompting module correspondingly generates a prompting signal. 10. The inductive power supply according to claim 1, further comprising a switching module for generating a switching signal to switch between a setting operation and the inductive power transmission operation of the processing module . 11. The inductive power supply as claimed in claim 10, wherein the storage module further comprises a program code for comparing an operating voltage of the feedback signal with an operating voltage of the default data. 12. The inductive power supply as claimed in claim 11, wherein when the operating voltage of the feedback signal is greater than the operating voltage of the default data, the processing module generates a second stop signal to end The setting mode. 13. The inductive power supply as claimed in claim 1, wherein the storage module further comprises a non-volatile memory correspondingly storing the default data and another program code, and the program code controls the processing The module is used to obtain the initial state of the inductive power supply through a frequency conversion method. 14. The inductive power supply as claimed in claim 1, wherein, no matter whether the induction coil is electrically coupled to the power receiving device or not, the feedback module detects a change in the amplitude of a sine wave, so that the processing The module judges whether to perform the inductive charging operation. 15. A method for an inductive power supply comprising a processing module, an induction coil and a default data for performing an inductive power transfer operation while detecting the inductive power supply Whether there is a metal foreign body in, it is characterized in that, this method comprises: generating a control signal according to a switching module, switching the inductive power supply between a setting operation and the inductive power transmission operation; and When the inductive power supply performs the setting operation, the processing module performs a first work process, and when the inductive power supply performs the inductive power transmission work, the processing module performs a second work process; Wherein, the default data is an initial state of the inductive power supply, and forms an initial lookup table, and the first working procedure is to modify the initial lookup table of the inductive power supply to form a modified lookup table, The second working procedure is to detect whether the metal foreign object exists in the inductive power supply according to modifying the look-up table. 16. The method of claim 15, wherein the first workflow further comprises: performing a voltage division operation on a stable voltage source to generate a first voltage division value; By default, the first divided voltage value is a data header, which is newly added to the initial lookup table to form the modified lookup table; According to the first divided voltage value, a current working clock of the processing module is set as a maximum working clock of the inductive power supply; Transmitting the working clock to a driving module to correspond to a driving voltage generated by the driving module to the induction coil, and converting a voltage signal of the induction coil into a feedback signal by a feedback module; and judging whether the voltage signal of the induction coil exceeds a maximum operating voltage of the feedback module, and if the voltage signal of the induction coil does not exceed the maximum operating voltage of the feedback module, reduce the current work set by the processing module The clock is used to form the modified lookup table by adding a plurality of data headers under different stable voltage sources. 17. The method of claim 16, wherein the second workflow further comprises: performing the voltage division operation on the stable voltage source to generate a second divided voltage value; and Judging whether the second divided voltage value matches a data header in the modified lookup table, so as to determine whether to continue the second working process. 18. The method of claim 17, wherein the second workflow further comprises: When deciding to continue the second working process, the driving module generates the driving voltage to the induction coil according to the current working clock of the processing module, and the feedback module converts the current voltage signal of the induction coil into the Feedback signals to the processing module; Retrieving a sine wave amplitude corresponding to the working clock of the current processing module from the modified lookup table; and judging whether the difference in amplitude of the sine wave corresponding to the feedback signal and the working clock exceeds an error range, and when the difference in amplitude of the sine wave exceeds the error range, the processing module judges that there is The metal foreign object further stops the inductive power transmission. 19. The method according to claim 18, further comprising using a prompting module, and when the difference of the amplitude of the sine wave exceeds the error range, the prompting module correspondingly generates a prompting signal. 20. The method according to claim 15, wherein the first workflow and the second workflow are compiled into a program code correspondingly stored in a storage module, and the program code is executed by the processing module , to perform the first workflow and the second workflow. 21. The method of claim 20, wherein the storage module further comprises a non-volatile memory for storing the program code, the initial look-up table and the modified look-up table. 22. The method of claim 15, wherein the processing module further executes another program code to obtain the initial state of the inductive power supply through a frequency conversion method, and form the initial look-up table. 23. The method according to claim 15, wherein, regardless of whether the induction coil is electrically coupled to a power receiving device, the processing module determines the Whether to perform the inductive charging operation.