CN112542876B - Electronic device and wireless charging method - Google Patents

Abstract

The application discloses an electronic device and a wireless charging method. The electronic device includes: a battery unit; a wireless transceiver circuit comprising: an oscillating circuit composed of an inductance coil and a capacitance; the control module is used for controlling the wireless transceiver circuit to periodically charge the oscillating circuit by using the excitation source and controlling the wireless transceiver circuit to convert the electric energy stored in the oscillating circuit into an electromagnetic signal after the charging is completed so as to generate self-resonant oscillation; the signal processing module is used for processing the oscillation signal received from the oscillation circuit to obtain a processed signal and sending the processed signal to the control module; the control module is also used for determining resonance parameters of the processed signals and determining whether equipment for inducing electromagnetic signals is equipment to be charged or not according to the resonance parameters; wherein the resonance parameter is used to reflect the quality factor of the oscillating circuit. The electronic equipment can improve the safety of reverse wireless charging and avoid the damage of the equipment.

Description

Electronic device and wireless charging method

Technical Field

The present disclosure relates to wireless charging technology, and in particular to an electronic device and a wireless charging method.

Background technique

With the popularization of wireless charging technology, more and more electronic devices support wireless charging function.

In wireless charging technology, the wireless receiver (such as device A to be charged) can also realize the reverse wireless charging function, that is, after its reverse charging function is turned on, it acts as a wireless transmitter and provides the electric energy stored in its battery cell to other wireless receivers (such as device B to be charged).

Usually, before the device A to be charged turns on the reverse wireless charging function, it will first detect whether there are other devices to be charged nearby; if other devices to be charged are detected, it will connect with the other devices to be charged and transmit the electric energy stored in their battery cells through the transmitting coil; the other devices to be charged, which serve as wireless receivers, receive energy through the receiving coils and charge their battery cells.

In the related art, the device A to be charged detects whether there are other devices to be charged nearby by periodically sending resonant waves. However, when there are other wireless transmitters (such as wireless charging bases) around the device A to be charged, because the wireless charging base is also detecting wireless receivers by sending periodic resonant waves, if the energy of the two resonant waves is superimposed, it will cause the energy sensed by the device A to be charged or the wireless charging base to be superimposed, and then high voltage will damage the device A to be charged or the wireless charging base. Therefore, how to detect whether the device around the device A to be charged is a wireless charging base or other device to be charged has become an urgent problem to be solved.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art.

Summary of the invention

The present disclosure provides an electronic device and a wireless charging method, which can improve the safety of reverse wireless charging and avoid damage to the device.

Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

According to a first aspect of the present disclosure, there is provided an electronic device, comprising: a battery unit; a wireless transceiver circuit, comprising: an oscillation circuit composed of an inductor and a capacitor; a control module, used to control the wireless transceiver circuit to periodically use an excitation source to charge the oscillation circuit, and after the charging is completed, control the wireless transceiver circuit to convert the electrical energy stored in the oscillation circuit into an electromagnetic signal to generate a self-resonant oscillation; and a signal processing module, used to process the oscillation signal received from the oscillation circuit to obtain a processed signal, and send the processed signal to the control module; wherein the control module is also used to determine the resonance parameters of the processed signal, and determine whether the device that senses the electromagnetic signal is a device to be charged based on the resonance parameters; wherein the resonance parameters are used to reflect the quality factor of the oscillation circuit.

According to an embodiment of the present invention, the resonance parameter is the decay time of the processed signal.

According to one embodiment of the present invention, the signal processing module includes: an amplifier and a filter; the amplifier is used to amplify the oscillation signal, and the filter is used to filter the amplified oscillation signal to extract the envelope signal of the amplified oscillation signal waveform, and the envelope signal is the processed signal.

According to an embodiment of the present invention, the excitation source is a step excitation source.

According to one embodiment of the present invention, the control module is further used to establish a connection with the device to be charged when it is determined to be the device to be charged, and control the wireless transceiver circuit to convert the electrical energy output by the battery unit into an electromagnetic signal for transmission.

According to one embodiment of the present invention, the electronic device also includes: a voltage conversion module, which is respectively connected to the control module, the battery unit and the wireless transceiver circuit, and is used to convert the voltage and/or current output by the battery unit before providing the electric energy output by the battery unit to the wireless transceiver circuit.

According to one embodiment of the present invention, the control module is also used to receive the charging current and/or charging voltage information fed back by the device to be charged, and control the voltage conversion module to convert the voltage and/or current output by the battery cell according to the charging current and/or charging voltage information.

According to an embodiment of the present invention, the wireless transceiver circuit is further used to receive electromagnetic signals and convert the electromagnetic signals into output currents to charge the battery units.

According to a second aspect of the present invention, there is provided a wireless charging method, which is applied to an electronic device, comprising: controlling a wireless transceiver circuit of the electronic device to periodically use an excitation source to charge an oscillation circuit in the wireless transceiver circuit, wherein the oscillation circuit is composed of an inductor and a capacitor; after charging is completed, controlling the wireless transceiver circuit to convert the electrical energy stored in the oscillation circuit into an electromagnetic signal and generate self-resonant oscillation; processing the oscillation signal received from the oscillation circuit to obtain a processed signal; determining the resonance parameters of the processed signal; and determining whether a device that senses the electromagnetic signal is a device to be charged based on the resonance parameters; wherein the resonance parameters are used to reflect the quality factor of the oscillation circuit.

According to an embodiment of the present invention, the resonance parameter is the decay time of the processed signal.

According to one embodiment of the present invention, the oscillation signal received from the oscillation circuit is processed to obtain a processed signal, which includes: amplifying the oscillation signal; and filtering the amplified oscillation signal to extract an envelope signal of the amplified oscillation signal waveform, wherein the envelope signal is the processed signal.

According to an embodiment of the present invention, the excitation source is a step excitation source.

According to one embodiment of the present invention, the method further includes: when it is determined to be the device to be charged, establishing a connection with the device to be charged; and controlling the wireless transceiver circuit to convert the electrical energy output by the battery unit of the electronic device into an electromagnetic signal for transmission.

According to an embodiment of the present invention, before converting the electrical energy output by the battery cell of the electronic device into an electromagnetic signal for transmission, the method further comprises: converting the voltage and/or current output by the battery cell.

According to one embodiment of the present invention, before converting the voltage and/or current output by the battery cell, the method further includes: receiving charging current and/or charging voltage information fed back by the device to be charged; and converting the voltage and/or current output by the battery cell according to the charging current and/or charging voltage information.

According to the electronic device provided by the present disclosure, a reverse charging function can be provided. Before reverse charging is performed, the surrounding opposite-end devices are first identified to determine whether they are devices to be charged that can be wirelessly charged; after being determined to be devices to be charged, the devices to be charged are connected to perform wireless charging on the devices to be charged, thereby improving the safety of wireless charging and avoiding damage to the devices.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

Fig. 1 is a block diagram showing a device to be charged according to an exemplary embodiment.

FIG. 2 is a schematic structural diagram of a wireless charging system according to an example.

Fig. 3 is a schematic diagram of a wireless transceiver circuit according to an exemplary embodiment.

Fig. 4 is a flow chart showing a wireless charging method according to an exemplary embodiment.

Fig. 5 is a flow chart showing another wireless charging method according to an exemplary embodiment.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are only schematic illustrations of the disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known structures, methods, devices, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

In the present disclosure, unless otherwise clearly specified and limited, the terms "connected", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

During the wireless charging process, a power supply device (such as an adapter) is generally connected to a wireless charging device (such as a wireless charging base), and the output power of the power supply device is transmitted to the device to be charged in a wireless manner (such as an electromagnetic signal or electromagnetic wave) through the wireless charging device, so that the device to be charged is wirelessly charged.

According to different wireless charging principles, wireless charging methods are mainly divided into three methods: magnetic coupling (or electromagnetic induction), magnetic resonance, and radio waves. At present, the mainstream wireless charging standards include the QI standard, the Power Matters Alliance (PMA) standard, and the Alliance for Wireless Power (A4WP). Both the QI standard and the PMA standard use magnetic coupling for wireless charging. The A4WP standard uses magnetic resonance for wireless charging.

Fig. 1 is a block diagram showing a device to be charged according to an exemplary embodiment.

The device to be charged 10 shown in FIG. 1 may be, for example, a terminal or a communication terminal, which includes but is not limited to a device configured to receive/send communication signals via a wired line connection, such as via a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via, for example, a cellular network, a wireless local area network (WLAN), a digital television network such as a handheld digital video broadcasting handheld (DVB-H) network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or a wireless interface of another communication terminal. A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" and/or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that can combine cellular radio telephones with data processing, fax and data communication capabilities; personal digital assistants (PDAs) that can include radio telephones, pagers, Internet/intranet access, web browsers, notepads, calendars and/or global positioning system (GPS) receivers; and conventional laptop and/or handheld receivers or other electronic devices including radio telephone transceivers. In addition, the terminal may also include, but is not limited to, rechargeable electronic devices with charging functions such as e-book readers, smart wearable devices, mobile power supplies (such as power banks, travel chargers), electronic cigarettes, wireless mice, wireless keyboards, wireless headphones, Bluetooth speakers, etc.

1 , the device to be charged 10 includes a wireless transceiver circuit 102 , a control module 104 and a battery unit 108 .

FIG2 is a schematic diagram of the structure of a wireless charging system according to an example. As shown in FIG2 , the wireless charging system 1 includes: a power supply device 11, a wireless charging device 12, and a device to be charged 10. It should be noted that, in order to simplify the drawings, the specific structure of the device to be charged 10 in FIG2 is not shown. The specific structure of the device to be charged 10 can be seen in FIG1 .

1 and 2 , the forward wireless charging process of the device to be charged 10 is first described, that is, how the device to be charged 10 is wirelessly charged by the wireless charging device 12. The following further describes how the device to be charged 10 identifies the surrounding opposite devices before turning on the reverse charging function.

The power supply device 11 may be, for example, a power adapter, a mobile power bank, etc. The wireless charging device 12 may be, for example, a wireless charging base.

After the power supply device 11 is connected to the wireless charging device 12 , the current outputted by the power supply device 11 is transmitted to the wireless charging device 12 .

The wireless charging device 12 includes a wireless transmitting circuit 121 and a first control module 122 .

The wireless transmitting circuit 121 is used to convert the electric energy output by the power supply device 11 into an electromagnetic signal (or electromagnetic wave) for transmission, so as to wirelessly charge the device to be charged 10. For example, the wireless transmitting circuit 121 may include: a wireless transmitting driving circuit and a transmitting coil (or transmitting antenna). The wireless transmitting driving circuit is used to convert the direct current output by the power supply device 11 into high-frequency alternating current, and convert the high-frequency alternating current into an electromagnetic signal (or electromagnetic wave) through a transmitting coil or a transmitting antenna and transmit it.

The first control module 122 can be implemented, for example, by a micro control unit (MCU). The first control module 122 can be used to wirelessly communicate with the device to be charged 10 during the process in which the wireless charging device 12 wirelessly charges the device to be charged 10. Specifically, the first control module 122 can wirelessly communicate with the control module 104 in the device to be charged 10.

In addition, the wireless charging device 12 may further include a charging interface 123. The wireless transmitting circuit 121 may also be used to receive the power output by the power supply device 11 through the charging interface 123, and generate an electromagnetic signal (or electromagnetic wave) according to the power output by the voltage supply device 11.

The charging interface 123 may be, for example, a USB 2.0 interface, a Micro USB interface, or a USB TYPE-C interface. In some embodiments, the charging interface 123 may also be a lightning interface, or any other type of parallel or serial port that can be used for charging.

The wireless charging device 12 can communicate with the power supply device 11, for example, through the charging interface 123, without the need to set up an additional communication interface or other wireless communication module, which can simplify the implementation of the wireless charging device 12. If the charging interface 123 is a USB interface, the wireless charging device 12 (or the wireless transmitting circuit 121) and the power supply device 11 can communicate based on the data line (such as D+ and/or D- line) in the USB interface. For another example, if the charging interface 123 is a USB interface (such as a USB TYPE-C interface) that supports the Power Delivery (PD) communication protocol, the wireless charging device 12 (or the wireless transmitting circuit 121) and the power supply device 11 can communicate based on the PD communication protocol.

In addition, the wireless charging device 12 can also communicate with the power supply device 11 through other communication methods other than the charging interface 123. For example, the wireless charging device 12 can communicate with the power supply device 11 in a wireless manner, such as near field communication (NFC).

The wireless transceiver circuit 102 in the device to be charged 10 is used to receive the electromagnetic signal (or electromagnetic wave) transmitted by the wireless transmitting circuit 121, and convert the electromagnetic signal (or electromagnetic wave) into direct current output by the wireless transceiver circuit 102. For example, the wireless transceiver circuit 102 may include: a receiving coil or a receiving antenna and a shaping circuit such as a rectifier circuit and/or a filter circuit connected to the receiving coil or the receiving antenna. The wireless transceiver circuit 102 converts the electromagnetic signal (or electromagnetic wave) transmitted by the wireless transmitting circuit 121 into alternating current through the receiving coil or the receiving antenna, and performs operations such as rectifying and/or filtering on the alternating current through the shaping circuit, thereby converting the alternating current into stable direct current to charge the battery unit 108.

It should be noted that the embodiment of the present invention does not specifically limit the specific form of the shaping circuit and the form of the output voltage and output current of the wireless transceiver circuit 102 obtained after the shaping circuit.

As shown in FIG. 1 , the device to be charged 10 may further include: a voltage conversion module 110 .

When the output voltage of the wireless transceiver circuit 102 cannot meet the expected charging voltage requirement of the battery unit 108, and/or the output current of the wireless transceiver circuit 102 cannot meet the expected charging current requirement of the battery unit 108, the voltage conversion module 110 can be used to convert the output voltage and/or the charging current expected by the battery unit 108. For example, the output voltage and the output current of the wireless transceiver circuit 102 are input into the voltage conversion module 110; after the voltage conversion module 110 converts the input voltage, the output voltage and current are loaded on both ends of the battery unit 108 to meet the expected charging voltage and/or charging current requirement of the battery unit 108.

The battery unit 108 may include a single cell or multiple cells. When the battery unit 108 includes multiple cells, the multiple cells may be connected in series. Thus, the charging voltage that the battery unit 108 can withstand is the sum of the charging voltages that the multiple cells can withstand, which can increase the charging speed and reduce the heating during charging.

For example, taking the device 10 to be charged as a mobile phone, when the battery unit 108 of the device 10 to be charged includes a single battery cell, the voltage of the internal single battery cell is generally between 3.0V and 4.45V. When the battery unit 108 of the device 10 to be charged includes two battery cells connected in series, the total voltage of the two battery cells connected in series is 6.0V-8.9V. Therefore, compared with a single battery cell, when multiple battery cells are connected in series, the output voltage of the wireless transceiver circuit 102 can be increased. Compared with a single battery cell, to achieve the same charging speed, the charging current required for multiple battery cells is approximately 1/N of the charging current required for a single battery cell (N is the number of battery cells connected in series in the device 10 to be charged). In other words, under the premise of ensuring the same charging speed (the same charging power), the use of a multi-cell solution can reduce the size of the charging current, thereby reducing the heat generated by the device 10 to be charged during the charging process. On the other hand, compared with the single battery cell solution, the use of a multi-cell series solution can increase the charging voltage while keeping the charging current the same, thereby increasing the charging speed.

The control module 104 may be implemented, for example, by an independent MCU, or may also be implemented by an application processor (AP) inside the device to be charged 13. The control module 104 is used to communicate with the first control module 122 in the wireless charging apparatus 12.

The control module 104 communicates with the wireless charging device 12 wirelessly. The present invention does not limit the communication method and communication sequence between the wireless charging device 12 and the device to be charged 10 (control module 104). For example, it can be a one-way wireless communication or a two-way wireless communication. It can be a communication initiated by the device to be charged 10 or a communication initiated by the wireless charging device 12.

In the wireless communication process, the device to be charged 10 can couple the information to be sent to the receiving coil of the wireless transceiver circuit 102, so as to send it to the transmitting coil of the wireless transmitting circuit 121, and then the wireless transmitting circuit 121 sends the decoupled information to the first control module 122. Conversely, in bidirectional communication, the wireless charging device 12 can couple the information to be sent to the transmitting coil of the wireless transmitting circuit 121, so as to send it to the receiving coil of the wireless transceiver circuit 102 of the device to be charged 10, and then the receiving coil of the wireless transceiver circuit 102 of the device to be charged 10 performs decoupling.

Alternatively, the device to be charged 10 can also communicate with the wireless charging device 12 through at least one of Bluetooth, WiFi, mobile cellular network communication (such as 2G, 3G, 4G or 5G), wireless communication (such as lEEE 802.11, 802.15 (WPANs), 802.16 (WiMAX), 802.20, etc.), short-range wireless communication based on high-frequency antenna (such as 60GHz), optical communication (such as infrared communication), ultrasonic communication, ultra-wideband (UMB) communication, etc. It can be understood that when communicating through the above-mentioned communication methods, the device to be charged 10 and the wireless charging device 12 also include corresponding communication modules, such as Bluetooth communication module, WiFi communication module, 2G/3G/4G/5G mobile communication module, high-frequency antenna, optical communication module. Ultrasonic communication module, ultra-wideband communication module, etc. At least one. It should be understood that the standards that can be used for the above-mentioned wireless communication include previous and existing standards, and without departing from the scope of the present disclosure, also include future versions and future standards of these standards. Communicating through the above-mentioned wireless communication methods can improve the reliability of communication, thereby improving charging safety. Compared with the communication method of coupling feedback information to the receiving coil of the wireless transceiver circuit 102 by signal modulation in related technologies (for example, the Qi standard), the reliability of communication can be improved, and the voltage ripple caused by communication using signal coupling can be avoided, which affects the voltage processing process of the voltage conversion module 110 of the device to be charged 10. In addition, for the voltage ripple at the output of the wireless receiving coil, if the ripple is not effectively processed, it may cause wireless charging safety problems and there are certain safety hazards. By communicating through the above-mentioned wireless communication method, the voltage ripple can be eliminated, thereby eliminating the circuit for processing the voltage ripple, reducing the complexity of the charging circuit of the device to be charged 10, improving the charging efficiency, saving the circuit setting space, and reducing the cost.

The control module 104 can, for example, feed back information such as the detected voltage value and/or current value on the charging channel 114, the remaining power of the battery unit 108 or the preset full charge time to the wireless charging device 12, and can also feed back error information and termination transmission information to the first control module 122; in addition, the feedback information can also include voltage and/or current adjustment instructions determined by the device to be charged 10 based on information such as the detected voltage value and/or current value on the charging channel 114, the remaining power or the preset full charge time.

Referring to FIG1 , the device to be charged 10 may further include: a detection circuit 112. The detection circuit 112 is used to detect the voltage value and/or current value on the charging channel 114. The voltage value and/or current value on the charging channel 114 may refer to the voltage value and/or current value between the voltage conversion module 110 and the battery cell 108, that is, the output voltage and/or output current of the voltage conversion module 110, which is directly loaded to the battery cell 108 to charge the battery cell 108. Alternatively, the voltage value and/or current value on the charging channel 114 may also refer to the voltage value and/or current value between the wireless transceiver circuit 102 and the voltage conversion module 110, that is, the output voltage value and/or current value of the wireless transceiver circuit 102.

In some embodiments, the detection circuit 112 may include: a voltage detection circuit and a current detection circuit. The voltage detection circuit is used to sample the voltage on the charging channel 114. The voltage detection circuit can, for example, sample the output voltage of the wireless transceiver circuit 102 by means of series voltage division. The current detection circuit is used to sample the current on the charging channel 114. The current detection circuit can, for example, sample the current on the charging channel 114 by means of a current detection resistor and a galvanometer.

The following jointly refers to Figures 1 and 2 to illustrate how the device to be charged 10 performs wireless charging for other devices to be charged when implementing reverse charging, that is, when acting as a wireless transmitter. It should be understood by those skilled in the art that during reverse charging, the device to be charged 10 needs to use the wireless transceiver circuit 102 as a wireless transmitter to charge other devices to be charged, and the battery unit 108 of the device to be charged 10 needs to perform a discharge operation as an energy provider during reverse charging, so the forward charging function and the reverse charging function of the device to be charged 10 cannot be performed at the same time. For example, the device to be charged can provide the user with a corresponding charging user interface, and the user can choose whether to turn on the reverse charging function.

Fig. 3 is a schematic diagram of another device to be charged according to an exemplary embodiment. As shown in Fig. 3 , the wireless transceiver circuit 102 in the device to be charged 10 further includes an oscillating circuit 1022 composed of an inductor coil L1 and a capacitor C1 and a current conversion circuit 1024 .

The current conversion circuit 1024 may include a rectifier circuit, for example. When the device to be charged 10 acts as a wireless receiver, the wireless transceiver circuit 102 converts the received electromagnetic signal into alternating current through the inductor L1, and then rectifies and/or filters the alternating current through the current change circuit 1024, thereby converting the alternating current into stable direct current to charge the battery unit 108.

The current conversion circuit 1024 may also include an inverse rectifier circuit. When the device to be charged 10 is used as a wireless transmitter, the current conversion circuit 1024 converts the DC power provided by the battery unit 108 into AC power, and the wireless transceiver circuit 102 then converts the AC power into an electromagnetic signal through the inductor L1 and transmits it.

When the device to be charged 10 is used as a wireless transmitter, the control module 104 can also be used to control the wireless transceiver circuit 102 to periodically use an excitation source to charge the oscillation circuit 1022. After charging is completed, the wireless transceiver circuit 102 is controlled to convert the electrical energy stored in the oscillation circuit 1022 into an electromagnetic signal, thereby generating a self-resonant oscillation.

In the oscillation circuit 1022, after the capacitor C1 is charged, the control module 104 controls the wireless transceiver circuit 102 to make the capacitor C1 form a discharge loop through the inductor L1. The capacitor C1 converts its stored electrical energy into the magnetic field energy of the inductor L1 during the discharge process. Then, the inductor L1 charges the capacitor C1 again, converting the magnetic field energy into electrical energy, and the cycle repeats. However, due to the loss in the loop, a part of the electrical energy is converted into heat energy and consumed during each charge and discharge process, and the voltage on the capacitor will decrease after each oscillation, and finally stop oscillating.

In some embodiments, the excitation source is, for example, a step excitation source, which provides a short DC level for the oscillation circuit 1022 .

As shown in FIG1 , the device to be charged 10 further includes a signal processing module 106 . The signal processing module 106 is used to receive an oscillation signal from the oscillation circuit 1022 when the oscillation circuit 1022 performs self-resonance oscillation, process the oscillation signal, and send the processed signal to the control module 104 .

The control module 104 is also used to determine the resonance parameter of the processed signal, and determine whether the device sensing the electromagnetic signal sent by the wireless transceiver circuit 102 is a device to be charged according to the resonance parameter. The resonance parameter is used to reflect the quality factor Q of the oscillation circuit 1022.

The quality factor Q is a dimensionless parameter, a physical quantity used to represent the damping properties of an oscillating circuit. The higher the quality factor Q, the slower the rate of energy loss in the oscillating circuit, that is, the slower the oscillation decays, and the longer the oscillation can last.

In the oscillation circuit composed of inductance and capacitance, the calculation formula of quality factor Q is as follows:

Wherein, L is the inductance of the inductor L1, C is the capacitance of the capacitor C1, and _RS is the parasitic resistance in the oscillation circuit 1022.

Since the inductance value of the inductor coil of the wireless charging device 12 is different from the inductance value of the inductor coil in the device to be charged, the inductor coil of the wireless charging device 12 is coupled with the inductor coil L1 of the device to be charged 10 as the wireless transmitter, and the mutual inductance value formed on the device to be charged 10 is different from the mutual inductance value formed by the mutual inductance between other devices to be charged as wireless receivers and the device to be charged 10, that is, the inductance value L in the above quality factor calculation formula is different. The above resonance parameter is used to reflect the quality factor Q of the oscillation circuit 1022, so the control module 104 can determine whether the device that senses the electromagnetic signal sent by the device to be charged 10 as the wireless transmitter is another device to be charged based on the resonance parameter.

In some embodiments, the resonance parameter may be, for example, the decay time of the processed signal, which is used to reflect the quality factor Q of the oscillation circuit 1022 .

In some embodiments, the signal processing module 106 may include: an amplifier 1062 and a filter 1064. The amplifier 1062 is used to amplify the oscillation signal. The filter 1064 is used to filter the amplified oscillation signal and extract the envelope signal of the amplified oscillation signal waveform. The envelope signal is the above-mentioned processed signal.

In some embodiments, the voltage conversion module 110 can also be used to convert the voltage and/or current output by the battery unit 108 before providing the power output by the battery unit 108 to the wireless transceiver circuit 102. The voltage conversion module 110 is, for example, a boost circuit, which is used to boost the voltage according to demand before inverting the DC power provided by the battery unit 108.

In some embodiments, as described above, the control module 104 can also be used to communicate with the control modules of other devices to be charged, receive charging current and/or charging voltage information, the remaining power of the battery cell or the preset full charge time and other information fed back by other devices to be charged, and control the voltage conversion module 110 to convert the voltage and/or current output by the battery cell 108 based on the received feedback information.

As mentioned above, the feedback information of other devices to be charged may also include voltage and/or current adjustment instructions determined by other devices to be charged based on detected voltage and/or current values, the remaining power of the battery cell or the preset full charge time and other information.

According to the electronic device provided by the present disclosure, a reverse charging function can be provided. Before reverse charging is performed, the surrounding opposite-end devices are first identified to determine whether they are devices to be charged that can be wirelessly charged; after being determined to be devices to be charged, the devices to be charged are connected to perform wireless charging on the devices to be charged, thereby improving the safety of wireless charging and avoiding damage to the devices.

It should be clearly understood that the present disclosure describes how to form and use specific examples, but the principles of the present disclosure are not limited to any details of these examples. On the contrary, based on the teachings of the contents disclosed in the present disclosure, these principles can be applied to many other embodiments.

It should be noted that the block diagrams shown in the above figures are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

The following are embodiments of the method disclosed herein, which can be applied to the embodiments of the device disclosed herein. For details not disclosed in the embodiments of the method disclosed herein, please refer to the embodiments of the device disclosed herein.

Fig. 4 is a flow chart showing a wireless charging method according to an exemplary embodiment.

4 , the wireless charging method 20 includes:

In step S202, the wireless transceiver circuit of the electronic device is controlled to periodically use an excitation source to charge an oscillating circuit in the wireless transceiver circuit.

For example, the electronic device may be the above-mentioned device to be charged 10. Before it acts as a wireless transmitter for wireless charging, it controls the wireless transceiver circuit 102 through its control module 104 to periodically use an excitation source to charge the oscillation circuit 1022 composed of the inductor L1 and the capacitor C1 in the wireless transceiver circuit 102.

In some embodiments, the excitation source is, for example, a step excitation source.

In step S204, after charging is completed, the wireless transceiver circuit is controlled to convert the electrical energy stored in the oscillation circuit into an electromagnetic signal to generate a self-resonant oscillation.

In step S206, the oscillation signal received from the oscillation circuit is processed to obtain a processed signal.

In some embodiments, processing the oscillation signal received from the oscillation circuit includes: amplifying the oscillation signal; filtering the amplified oscillation signal to extract an envelope signal of the amplified oscillation signal waveform, and the envelope signal is the processed signal.

In step S208 , the resonance parameters of the processed signal are determined.

The resonance parameter is used to reflect the quality factor of the oscillation circuit.

In some embodiments, the resonance parameter is a decay time of the processed signal.

In step S210, it is determined whether the device that senses the electromagnetic signal is a device to be charged according to the resonance parameters.

As described above, since the inductance value of the inductor coil of the wireless charging device 12 is different from the inductance value of the inductor coil in the device to be charged, the inductor coil of the wireless charging device 12 is coupled with the inductor coil L1 of the device to be charged 10 as the wireless transmitter, and the mutual inductance value formed on the device to be charged 10 is different from the mutual inductance value formed by the mutual inductance between other devices to be charged as wireless receivers and the device to be charged 10, that is, the inductance value L in the above quality factor calculation formula is different. The above resonance parameter is used to reflect the quality factor Q of the oscillation circuit 1022, so the control module 104 can determine whether the device that senses the electromagnetic signal sent by the device to be charged 10 as the wireless transmitter is another device to be charged based on the resonance parameter.

According to the wireless charging method provided by the present invention, a reverse charging function can be provided. Before reverse charging is performed, the surrounding opposite-end device is first identified to determine whether it is a device to be charged that can be wirelessly charged; after it is determined to be a device to be charged, it is connected to the device to be charged to wirelessly charge the device to be charged, thereby improving the safety of wireless charging and avoiding damage to the device.

Fig. 5 is a flow chart showing another wireless charging method according to an exemplary embodiment.

The method 20 shown in FIG. 4 includes that the wireless charging method 30 shown in FIG. 5 further includes:

In step S302, when it is determined that the device that senses the electromagnetic signal is a device to be charged, a connection is established with the device to be charged.

In step S304, the wireless transceiver circuit is controlled to convert the electric energy output by the battery unit of the electronic device into an electromagnetic signal for transmission.

In some embodiments, before converting the electrical energy output by the battery cell of the electronic device into an electromagnetic signal for transmission, method 30 may further include: converting the voltage and/or current output by the battery cell.

In some embodiments, before converting the voltage and/or current output by the battery cell, method 30 may also include: receiving charging current and/or charging voltage information fed back by the device to be charged; and converting the voltage and/or current output by the battery cell according to the charging current and/or charging voltage information.

It should be noted that the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to be limiting. That is, it is not required or implied that these steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and/or one step can be decomposed into multiple steps, etc. In addition, these processes can also be performed synchronously or asynchronously in multiple modules.

The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims (10)

1. An electronic device, comprising: Battery cells; The wireless transceiver circuit includes: an oscillating circuit composed of an inductor coil and a capacitor; Before the reverse charging function is turned on, the control module is used to control the wireless transceiver circuit to periodically use the excitation source to charge the oscillation circuit, and after the charging is completed, control the wireless transceiver circuit to convert the electrical energy stored in the oscillation circuit into an electromagnetic signal to generate a self-resonant oscillation; and a signal processing module, configured to receive an oscillation signal from the oscillation circuit when the oscillation circuit performs self-resonance oscillation, process the oscillation signal received from the oscillation circuit to obtain a processed signal, and send the processed signal to the control module; The control module is further used to determine the resonance parameters of the processed signal, and determine whether the device that senses the electromagnetic signal sent by the electronic device as a wireless transmitter is a device to be charged or other wireless transmitter according to the resonance parameters; Wherein, the resonance parameter is used to reflect the quality factor of the oscillation circuit; The excitation source is a step excitation source, and the resonance parameter is the decay time of the processed signal; The wireless transceiver circuit is also used to receive electromagnetic signals and convert the electromagnetic signals into output currents to charge the battery units; The inductance values formed when the device to be charged and the other wireless transmitters sense the electromagnetic signal sent by the electronic device as a wireless transmitter are different, and the inductance values are used to calculate the quality factor. 2. The electronic device according to claim 1 is characterized in that the signal processing module comprises: an amplifier and a filter; the amplifier is used to amplify the oscillation signal, and the filter is used to filter the amplified oscillation signal to extract the envelope signal of the amplified oscillation signal waveform, and the envelope signal is the processed signal. 3. The electronic device according to claim 1 is characterized in that the control module is also used to establish a connection with the device to be charged when it is determined to be the device to be charged, and control the wireless transceiver circuit to convert the electrical energy output by the battery unit into an electromagnetic signal for transmission. 4. The electronic device according to claim 3 is characterized in that it also includes: a voltage conversion module, which is respectively connected to the control module, the battery unit and the wireless transceiver circuit, and is used to convert the voltage and/or current output by the battery unit before providing the electric energy output by the battery unit to the wireless transceiver circuit. 5. The electronic device according to claim 4 is characterized in that the control module is also used to receive the charging current and/or charging voltage information fed back by the device to be charged, and control the voltage conversion module to convert the voltage and/or current output by the battery cell according to the charging current and/or charging voltage information. 6. A wireless charging method, applied to an electronic device, comprising: Before the reverse charging function is turned on, the wireless transceiver circuit of the electronic device is controlled to periodically use an excitation source to charge an oscillating circuit in the wireless transceiver circuit, wherein the oscillating circuit is composed of an inductor coil and a capacitor; After charging is completed, controlling the wireless transceiver circuit to convert the electrical energy stored in the oscillation circuit into an electromagnetic signal and generate a self-resonant oscillation; When the oscillation circuit performs self-resonant oscillation, receiving an oscillation signal from the oscillation circuit, and processing the oscillation signal received from the oscillation circuit to obtain a processed signal; determining resonance parameters of the processed signal; and Determine, according to the resonance parameter, whether the device that senses the electromagnetic signal sent by the electronic device as a wireless transmitter is a device to be charged or another wireless transmitter; Wherein, the resonance parameter is used to reflect the quality factor of the oscillation circuit; The excitation source is a step excitation source; The resonance parameter is the decay time of the processed signal; The wireless transceiver circuit is also used to receive electromagnetic signals and convert the electromagnetic signals into output currents to charge the battery units; The inductance values formed when the device to be charged and the other wireless transmitters sense the electromagnetic signal sent by the electronic device as a wireless transmitter are different, and the inductance values are used to calculate the quality factor. 7. The method according to claim 6, characterized in that the oscillation signal received from the oscillation circuit is processed to obtain the processed signal comprising: amplifying the oscillation signal; and The amplified oscillation signal is filtered to extract an envelope signal of the amplified oscillation signal waveform, wherein the envelope signal is the processed signal. 8. The method according to claim 6 is characterized in that it also includes: when it is determined to be the device to be charged, establishing a connection with the device to be charged; and controlling the wireless transceiver circuit to convert the electrical energy output by the battery unit of the electronic device into an electromagnetic signal for transmission. 9. The method according to claim 8 is characterized in that before converting the electrical energy output by the battery cell of the electronic device into an electromagnetic signal for transmission, the method further comprises: converting the voltage and/or current output by the battery cell. 10. The method according to claim 9 is characterized in that before converting the voltage and/or current output by the battery cell, the method also includes: receiving charging current and/or charging voltage information fed back by the device to be charged; and converting the voltage and/or current output by the battery cell according to the charging current and/or charging voltage information.