Wireless charging circuit, method and related device

Abstract

The embodiment of the invention provides a wireless charging circuit, a wireless charging method and a related device, which are applied to the technical field of terminals. The circuit comprises a receiving coil, a receiving chip and a power supply module, the receiving coil is used for receiving the magnetic field energy from the wireless charging equipment and outputting alternating current voltage to the receiving chip; the receiving chip is used for converting the alternating-current voltage into direct-current voltage; and the power supply module is used for supplying power to the receiving chip, so that the receiving chip is in a power-on state under the condition that the direct-current voltage is smaller than the working voltage of the receiving chip. Therefore, the electronic equipment can supply power to the receiving chip through the power supply module. When the energy of the magnetic field coupled to the receiving coil is small and does not reach the working voltage of the receiving chip, the receiving chip can be powered on to enable the electronic equipment to enter a charging process, and wireless charging of the electronic equipment is achieved. Therefore, the triggering condition of wireless charging of the electronic equipment is reduced, the degree of freedom of placing the electronic equipment on the wireless charging equipment is improved, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to wireless charging circuits, methods and related devices. Background Art

[0002] Electronic devices such as mobile phones and tablet computers have wireless charging functions. When charging an electronic device with a wireless charging function, a user simply places the electronic device on a wireless charging device such as a charging stand.

[0003] However, when a user places the electronic device on a wireless charging device such as a charging stand, it may not be able to charge. Summary of the invention

[0004] The embodiments of the present application provide a wireless charging circuit, method and related device, which are applied to the field of terminal technology. The electronic device can power the receiving chip through the power supply module. When the magnetic field energy coupled to the receiving coil is small and cannot power the receiving chip, wireless charging of the electronic device can be achieved. The triggering conditions for wireless charging of electronic devices are reduced, the degree of freedom of placing electronic devices on wireless charging devices is increased, and the user experience is improved.

[0005] In the first aspect, the embodiment of the present application proposes a wireless charging circuit. The circuit includes: a receiving coil, a receiving chip and a power supply module; the receiving coil is used to receive magnetic field energy from a wireless charging device and output an AC voltage to the receiving chip; the receiving chip is used to convert the AC voltage into a DC voltage; the power supply module is used to power the receiving chip, so that when the DC voltage is less than the working voltage of the receiving chip, the receiving chip is in a powered-on state.

[0006] In this way, the receiving chip is powered by the power supply module. When the magnetic field energy coupled to the receiving coil is small and cannot power the receiving chip, the receiving chip can be powered on to allow the electronic device to enter the charging process, thereby realizing wireless charging of the electronic device. In this way, the triggering conditions for wireless charging of electronic devices are reduced, the degree of freedom of placing electronic devices on wireless charging devices is increased, and the user experience is improved.

[0007] Optionally, the circuit also includes: a processor and a first switch; one end of the first switch is connected to the receiving chip, the other end of the first switch is connected to the power supply module, and the first switch is controlled by the processor; the processor is used to control the first switch to close when the AC voltage is greater than or equal to the second value, so as to control the power supply module to power the receiving chip; or, the processor is used to control the first switch to close when the DC voltage is greater than or equal to the first value, so as to control the power supply module to power the receiving chip.

[0008] The first value is the minimum value of the DC voltage required for the receiving chip to communicate with the wireless charging device. The second value is the minimum value of the AC voltage required for the receiving chip to communicate with the wireless charging device. The first value may correspond to the first threshold below; the second value may correspond to the fourth threshold below.

[0009] In this way, when the receiving coil does not receive magnetic field energy, or the coupled magnetic field energy is insufficient to support wireless communication, the power supply module does not supply power to the receiving chip, thereby reducing the power supply time to the receiving chip and reducing power consumption.

[0010] Optionally, the circuit also includes: a first detection unit; a first end of the first detection unit is connected to the receiving coil, and a second end of the first detection unit is connected to the first end of the processor; the first detection unit is used to transmit a first interrupt signal to the processor when the voltage at the first end of the first detection unit is greater than or equal to a second value; the processor is specifically used to control the first switch to close after receiving the first interrupt signal, so that the power supply module supplies power to the receiving chip.

[0011] In this way, the voltage value of the AC voltage can be detected by the detection unit to determine whether the first switch is closed or open, which is simple and easy to implement.

[0012] Optionally, the first detection unit includes: a first switching tube; the control electrode of the first switching tube is connected to the receiving coil, and the first electrode of the first switching tube is connected to the processor; the first switching tube is used to turn on when the voltage at the control end of the first switching tube is greater than or equal to the second value, and to turn off when the voltage at the control end of the first switching tube is less than the second value, and when the first switching tube changes from off to on, the level at the first end of the first switching tube switches; the processor is specifically used to control the first switch to close when the level switches at the first end of the processor.

[0013] In this way, the detection of AC voltage and the transmission of interruption signal are realized through the on-off characteristics of the switch tube. The structure is simple and easy to realize.

[0014] Optionally, the circuit further includes: a first resistor; one end of the first resistor is connected to the first end of the first switch tube, the other end of the first resistor is connected to the first interface, the voltage output by the first interface is greater than or equal to the voltage represented by the high level that can be recognized by the first pin of the processor; the first resistor is used to limit the current generated by the voltage output by the first interface in the first switch tube to be less than a preset current. This application does not specifically limit the value of the preset current.

[0015] In this way, the current flowing through the first switch tube can be limited, thereby reducing the probability of the first switch tube being damaged due to excessive current.

[0016] Optionally, the circuit also includes: a second switch tube; the control end of the second switch tube is connected to the second end of the processor, the first end of the second switch tube is connected to the first end of the first detection unit, and the second end of the second switch tube is grounded; the processor is also used to control the second switch tube to turn on after controlling the first switch to close, so as to interrupt the detection of the AC voltage by the first detection unit.

[0017] Thus, interrupting the detection of the AC voltage by the first detection unit after the receiving chip is powered on can reduce damage to the first detection unit when the DC voltage is large and extend the life of the first detection unit. In addition, the voltage resistance requirement of the first detection unit can be reduced, thereby reducing costs.

[0018] Optionally, the circuit also includes: a second switch; the other end of the second switch is connected to the receiving coil, and the other end of the second switch is connected to the first end of the first detection unit, and the second switch is controlled by the processor; the processor is also used to control the second switch to open after controlling the first switch to close, so as to interrupt the detection of the AC voltage by the first detection unit.

[0019] Thus, interrupting the detection of the AC voltage by the first detection unit after the receiving chip is powered on can reduce damage to the first detection unit when the AC voltage is large and extend the life of the first detection unit. In addition, the voltage resistance requirement of the first detection unit can be reduced, thereby reducing costs.

[0020] The circuit also includes: a second resistor; the second resistor is located between the receiving coil and the first switch tube; one end of the second resistor is connected to the receiving coil, and the other end of the second resistor is connected to the control end of the first switch tube; the second resistor is used to limit the current flowing through the first switch tube to be less than a first preset current. The first preset current can be any value.

[0021] In this way, when the voltage value of the AC voltage changes, the current flowing from the control end to the second end of the first switch tube can be reduced, thereby reducing damage to the first switch tube.

[0022] Optionally, the receiving coil includes: a rectifier bridge; a rectifier bridge, used to convert AC voltage into DC voltage; the circuit also includes: a second detection unit; the first end of the second detection unit is connected to the output end of the rectifier bridge, and the second end of the second detection unit is connected to the first end of the processor; the second detection unit is used to transmit a second interrupt signal to the processor when the voltage at the first end of the second detection unit is greater than or equal to the first value; the processor is specifically used to control the first switch to close after receiving the second interrupt signal, so that the power supply module supplies power to the receiving chip.

[0023] In this way, the voltage value of the AC voltage can be detected by the detection unit to determine whether the first switch is closed or open, which is simple and easy to implement.

[0024] Optionally, the second detection unit includes: a third switch tube; the control electrode of the third switch tube is connected to the output end of the rectifier bridge, and the first electrode of the third switch tube is connected to the processor; the third switch tube is used to turn on when the voltage at the control end of the first switch tube is greater than or equal to the first value, and to turn off when the voltage at the control end of the second switch tube is less than the first value, and when the third switch tube switches from off to on, the level at the first end of the first switch tube switches; the processor is specifically used to control the first switch to close when the level switches at the first end of the processor.

[0025] Thus, interrupting the detection of the DC voltage by the second detection unit after the receiving chip is powered on can reduce damage to the second detection unit when the DC voltage is large and extend the life of the second detection unit. In addition, the voltage resistance requirement of the second detection unit can be reduced, thereby reducing costs.

[0026] Optionally, the circuit also includes: a third resistor; one end of the third resistor is connected to the first end of the second switch tube, and the other end of the third resistor is connected to the first interface, the voltage output by the first interface is greater than or equal to the voltage represented by the high level that can be recognized by the first pin of the processor; the third resistor is used to limit the current generated by the voltage output by the first interface in the third switch tube to be less than the second preset current.

[0027] In this way, the current flowing through the third switch tube can be limited, thereby reducing the probability of the third switch tube being damaged due to excessive current.

[0028] Optionally, the circuit also includes: a third switch; the other end of the third switch is connected to the receiving coil, and the other end of the third switch is connected to the first end of the second detection unit, and the third switch is controlled by the processor; the processor is also used to control the third switch to open after controlling the first switch to close, so as to interrupt the second detection unit's detection of the DC voltage.

[0029] Thus, interrupting the detection of the DC voltage by the second detection unit after the receiving chip is powered on can reduce damage to the second detection unit when the DC voltage is large and extend the life of the first detection unit. In addition, the voltage resistance requirement of the first detection unit can be reduced, thereby reducing costs.

[0030] Optionally, the circuit also includes: a fourth switch tube; the control end of the fourth switch tube is connected to the second end of the processor, the first end of the fourth switch tube is connected to the first end of the second detection unit, and the second end of the fourth switch tube is grounded; the processor is also used to control the fourth switch tube to turn on after controlling the first switch to close, so as to interrupt the second detection unit's detection of the AC voltage.

[0031] Thus, interrupting the detection of the AC voltage by the second detection unit after the receiving chip is powered on can reduce damage to the second detection unit when the DC voltage is large and extend the life of the second detection unit. In addition, the voltage resistance requirement of the second detection unit can be reduced, thereby reducing costs.

[0032] Optionally, the processor is also used to obtain the voltage value of the DC voltage after receiving the first interrupt signal or the second interrupt signal; the processor is specifically used to control the first switch to close when the voltage value of the DC voltage is less than the operating voltage, so as to control the power supply module to power the receiving chip; the processor is specifically used to control the first switch to open when the voltage value of the DC voltage is greater than or equal to the operating voltage, so as to disconnect the receiving chip and the power supply module.

[0033] In this way, when the magnetic field energy coupled to the receiving coil is insufficient to power the receiving chip, the receiving chip can be powered by the power supply module. When the magnetic field energy coupled to the receiving coil can power the receiving chip, the power supply module is not used to power the receiving chip, thus saving energy consumption.

[0034] Optionally, the processor is also used to obtain status information of the receiving chip after receiving the first interrupt signal or the second interrupt signal; the processor is specifically used to control the first switch to close when the status information is used to indicate that the receiving chip meets the preset conditions, so as to control the power supply module to power the receiving chip; the processor is specifically used to control the first switch to open when the status information is used to indicate that the receiving chip does not meet the preset conditions, so as to interrupt the power supply of the receiving chip by the power supply module; the preset conditions include one or more of the following: the receiving chip is in a non-burning state, the receiving chip is in a non-reverse charging state, the receiving chip is not powered on (in a turned-off state), the non-burning state is used to indicate that the receiving chip has not been firmware burned, and the non-reverse charging state is used to indicate that the receiving chip is not reverse charged.

[0035] In this way, when the receiving chip enters the firmware burning, reverse charging process or other non-charging process, no power is supplied, thus saving energy consumption.

[0036] Optionally, the circuit further includes: a rectifier bridge, a first voltage divider unit, a second voltage divider unit and an analog-to-digital converter ADC;

[0037] The first end of the first voltage divider unit is connected to the output end of the rectifier bridge, the second end of the first voltage divider unit is connected to the first end of the second voltage divider unit, and the second end of the second voltage divider unit is grounded; one end of the ADC is connected to the second end of the first voltage divider unit, and the other end of the ADC is connected to the processor; the first voltage divider unit and the second voltage divider unit are used to divide the DC voltage; the ADC is used to collect the analog voltage at the second end of the first voltage divider unit and convert the analog voltage into a digital voltage; the processor is used to control the first switch to close when the DC voltage is greater than or equal to the first value, so as to control the power supply module to power the receiving chip.

[0038] In this way, the processor can confirm the closing or opening of the first switch through the ADC, which is simple and easy to implement.

[0039] Optionally, the processor is further used to obtain a voltage value of the DC voltage after controlling the first switch to close for a preset period of time; when the voltage value of the DC voltage is less than a third value, the processor controls the first switch to open.

[0040] The third value is the minimum value of the DC voltage required for charging the power supply. The third value can be 5V, 4V or other values, which are not limited here.

[0041] In this way, when the magnetic field energy coupled to the receiving coil is small and insufficient to charge the electronic device, the power supply of the power supply module can be interrupted to save energy consumption.

[0042] Optionally, the circuit also includes: a fourth switch and a power supply; one end of the fourth switch is connected to the receiving chip, and the other end of the fourth switch is connected to the power supply; the receiving chip is also used to communicate with the wireless charging device through the receiving coil when the voltage value of the DC voltage is less than the fourth value to enhance the magnetic field energy; the receiving chip is also used to communicate with the processor when the voltage value of the DC voltage is greater than or equal to the fourth value to control the closing of the fourth switch to charge the power supply.

[0043] The fourth value is a minimum value of a DC voltage required for charging the power source.

[0044] In this way, the receiving chip can communicate with the wireless charging device, boost the DC voltage, and charge the power supply.

[0045] In some embodiments, the fourth value is slightly less than the minimum value of the DC voltage required for charging the power source, and the receiving chip communicates with the processor when the voltage value of the DC voltage is greater than or equal to the fourth value. When the voltage value of the DC voltage is greater than or equal to the fifth value, the fourth switch is controlled to close so that the power source is charged.

[0046] In the second aspect, an embodiment of the present application proposes a wireless charging method. The method includes: a processor receives an interrupt signal from a detection unit, and the interrupt signal is used to indicate that the AC voltage is greater than or equal to a second value, or the DC voltage is greater than or equal to a first value; after receiving the interrupt signal, the processor controls the power supply module to power the receiving chip, so that when the DC voltage is less than the working voltage of the receiving chip, the receiving chip is in a power-on state. The AC voltage is the AC voltage generated after the receiving coil receives the magnetic field energy from the wireless charging device, and the DC voltage is obtained by converting the AC voltage by the receiving chip.

[0047] Optionally, after receiving the interrupt signal, the processor controls the power supply module to power the receiving chip, including: after receiving the interrupt signal, the processor obtains the voltage value of the DC voltage; when the voltage value of the DC voltage is less than the working voltage, the processor controls the power supply module to power the receiving chip; or, when the voltage value of the DC voltage is greater than or equal to the working voltage, the processor interrupts the power supply module to power the receiving chip.

[0048] Optionally, after receiving the interrupt signal, the processor controls the power supply module to power the receiving chip, including: after receiving the interrupt signal, the processor obtains status information of the receiving chip; when the status information is used to indicate that the receiving chip meets preset conditions, the processor controls the power supply module to power the receiving chip, and the preset conditions include one or more of the following: the receiving chip is in a non-burning state, the receiving chip is in a non-reverse charging state, and the receiving chip is not powered on. The non-burning state is used to indicate that the receiving chip has not been firmware burned, and the non-reverse charging state is used to indicate that the electronic device is not reverse charged.

[0049] Optionally, after receiving the interrupt signal, the processor controls the power supply module to supply power to the receiving chip, including: after receiving the interrupt signal, the processor controls the first switch to close.

[0050] Optionally, the method further includes: the processor obtains a voltage value of the DC voltage after controlling the first switch to close for a preset period of time; when the voltage value of the DC voltage is less than a third value, the processor controls the first switch to open.

[0051] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: the circuit of the first aspect.

[0052] In a fourth aspect, an embodiment of the present application provides an electronic device, which may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device may be a mobile phone, a smart TV, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc.

[0053] The electronic device comprises: a processor and a memory; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the terminal device executes the method as in the second aspect.

[0054] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the method of the second aspect is implemented.

[0055] In a sixth aspect, an embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is executed, the computer executes the method of the second aspect.

[0056] In a seventh aspect, an embodiment of the present application provides a chip, the chip including a processor, the processor being used to call a computer program in a memory to execute the method described in the second aspect.

[0057] It should be understood that the second to seventh aspects of the present application correspond to the technical solutions of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic diagram of an application scenario provided for an embodiment of the present application;

[0059] Figure 2A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0060] Figure 3 A schematic diagram of the structure of a receiving chip provided in an embodiment of the present application;

[0061] Figure 4 A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0062] Figure 5 A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0063] Figure 6 A schematic diagram of a wireless charging method provided in an embodiment of the present application;

[0064] Figure 7 A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0065] Figure 8 A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0066] Fig. 9 A schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application;

[0067] Fig.10 A schematic diagram of a wireless charging method provided in an embodiment of the present application;

[0068] Fig.11 A schematic diagram of a flow chart of a wireless charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to clearly describe the technical solutions of the embodiments of the present application, some terms and technologies involved in the embodiments of the present application are briefly introduced below:

[0070] 1. Working principle of NMOS tube

[0071] The NMOS tube includes a gate G, a drain D, and a source S. The voltage of the gate G of the NMOS tube is Vg, and the voltage of the source S of the NMOS tube is Vs. When Vg-Vs=Vgs is less than or equal to the turn-on voltage Vgs(th) (for example, Vgs(th)=1 volt), the NMOS tube is turned off; when Vg-Vs=Vgs is greater than the turn-on voltage Vgs(th) (for example, Vgs(th)=1 volt), the NMOS tube is turned on. The turn-on voltage can also be called a threshold voltage, a turn-on voltage, etc. The specific name of the turn-on voltage is not limited in the embodiments of the present application.

[0072] 2. Switching tube

[0073] The switch tube in the embodiment of the present application can be a metal oxide semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a power triode, a gallium nitride (GaN) transistor, or other types of power devices.

[0074] 3. Other terms

[0075] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first chip and the second chip are only used to distinguish different chips, and their order is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0076] It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0077] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, a--c, bc, or abc, where a, b, c can be single or multiple.

[0078] In the embodiment of the present application, "at..." can be the instant when a certain situation occurs, or can be a period of time after a certain situation occurs, and the embodiment of the present application does not specifically limit this. In addition, the interface of the terminal device provided in the embodiment of the present application is only an example, and the interface can also include more or less content.

[0079] 4. Electronic equipment

[0080] The electronic device of the embodiment of the present application may also be a terminal device in any form. For example, the electronic device may include a handheld device with a wireless charging function, a vehicle-mounted device, etc. For example, some electronic devices are: mobile phones, tablet computers, PDAs, laptop computers, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or future evolved public land mobile communication networks (public land mobile The embodiments of the present application do not limit this.

[0081] As an example but not limitation, in the embodiments of the present application, the electronic device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

[0082] In addition, in the embodiments of the present application, the electronic device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network that interconnects people and machines and things.

[0083] The electronic devices in the embodiments of the present application may also be referred to as: terminal equipment, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0084] When charging an electronic device with wireless charging function, users can simply place the electronic device on the wireless charging device. Compared with the traditional charging method that requires connecting a charging cable, wireless charging simplifies the operation of charging electronic devices and makes charging convenient.

[0085] For example, Figure 1 An application scenario diagram provided for an embodiment of the present application. Figure 1 The application scenario shown involves a charging system, which includes: an electronic device 100 and a wireless charging device 200. The wireless charging device 200 is provided with a transmitting coil, and the electronic device 100 is provided with a receiving coil. When the user places the electronic device 100 on the wireless charging device 200, the transmitting coil and the receiving coil are coupled by electromagnetic fields to achieve wireless transmission of electric energy.

[0086] The wireless charging device 200 may be a charging stand, or a mobile phone with a wireless charging function, etc. The embodiment of the present application does not limit the specific structure and form of the wireless charging device 200.

[0087] At present, when the user places the electronic device on a wireless charging device such as a charging stand, it may not be charged, resulting in a poor user experience. This is because when the deviation between the center point of the transmitting coil and the center point of the receiving coil is greater than a certain value, the magnetic field energy coupled to the receiving coil is small and cannot charge the power supply in the electronic device.

[0088] However, the value corresponding to the specific value is small, the triggering conditions of wireless charging are relatively harsh, and thus the degree of freedom of placing electronic devices on the wireless charging device is low. How to increase the specific value becomes an urgent problem to be solved.

[0089] In a possible design, the electronic device powers the receiving chip through the magnetic field energy received (coupled) by the receiving coil. The receiving chip can convert the AC voltage output by the receiving coil after receiving the magnetic field energy into a DC voltage to facilitate charging the power supply in the electronic device.

[0090] It should be noted that the operating voltage of the receiving chip is usually between 3V and 4V. Taking the operating voltage of the receiving chip as 3V as an example, when the magnetic field energy received by the receiving coil is small and the voltage output by the receiving coil is less than 3V, the receiving chip cannot be turned on (activated) and the electronic device cannot be charged.

[0091] In view of this, the embodiments of the present application provide wireless charging circuits, methods and related devices. The electronic device can power the receiving chip through the power supply module. When the magnetic field energy coupled to the receiving coil is small and does not reach the operating voltage of the receiving chip, the receiving chip can be in a powered-on state, thereby controlling the electronic device to enter the charging process and realize wireless charging of the electronic device. In this way, the triggering conditions for wireless charging of electronic devices are reduced, the degree of freedom of placing electronic devices on wireless charging devices is increased, and the user experience is improved.

[0092] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be implemented independently or in combination with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0093] The wireless charging circuit and the wireless charging method provided in the embodiments of the present application are described below with reference to the accompanying drawings.

[0094] For example, Figure 2 A schematic diagram of a wireless charging circuit provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the wireless charging circuit includes: a receiving coil 201 , a receiving chip 202 , a power supply 204 and a power supply module 205 .

[0095] Two ends of the receiving coil 201 are respectively connected to the first end 1a and the second end 1b of the receiving chip 202 , the third end 1c of the receiving chip 202 is connected to the power supply 204 ; the fourth end 1d of the receiving chip 202 is connected to the power supply module 205 .

[0096] The receiving coil 201 is used to receive magnetic field energy from the wireless charging device and output an AC voltage to the receiving chip 202 .

[0097] The receiving chip 202 is used to convert the AC voltage output by the receiving coil 201 into a DC voltage. Exemplarily, the receiving chip 202 may include a rectifier bridge 2021. The rectifier bridge 2021 is used to convert the AC voltage output by the receiving coil 201 into a DC voltage.

[0098] The power supply module 205 is used to supply power to the receiving chip 202, so that the receiving chip 202 can enter the power-on state when the DC voltage is less than the working voltage of the receiving chip 202. Adaptively, after the receiving chip 202 enters the power-on state, the power supply 204 can be charged.

[0099] In some embodiments, the power supply module 205 may process the AC voltage coupled to the receiving coil 201 through the rectifier bridge 2021 in the receiving chip 202 to obtain a DC voltage.

[0100] In the embodiment of the present application, the power supply module 205 can continuously output a fixed voltage in the power-on state. The power supply module 205 can be an existing module in the electronic device, for example, a module used as a driver (power management unit, PMU), etc., and the embodiment of the present application does not limit this.

[0101] In this way, the receiving chip is powered by the power supply module 205, so that the receiving chip 202 is in a powered-on state. When the magnetic field energy coupled to the receiving coil 201 is small and the DC voltage converted by the receiving chip 202 is less than the working voltage of the receiving chip 202, wireless charging of the electronic device can also be achieved. In this way, the triggering conditions for wireless charging of the electronic device can be reduced, the degree of freedom of placing the electronic device on the wireless charging device can be increased, and the user experience can be improved.

[0102] In some embodiments, the wireless charging circuit further includes: a processor 206 . The fifth terminal 1 e of the receiving chip 202 is connected to the processor 206 , and the processor 206 is used to control the receiving chip 202 to charge the power source 204 .

[0103] The receiving chip 202 is also used to communicate with the wireless charging device through the receiving coil 201, and to communicate with the processor 206, so as to charge the power supply 204. Exemplarily, the receiving chip 202 may include a control module 2022, and the control module 2022 is used to communicate with the wireless charging device through the receiving coil 201 according to the voltage value of the DC voltage, and to communicate with the processor 206 according to the voltage value of the DC voltage.

[0104] Exemplarily, when the voltage value of the DC voltage is greater than the first threshold, the receiving chip 202 can communicate with the wireless charging device through the receiving coil 201 to perform identity authentication, increase the magnetic field energy sent by the transmitting coil, etc. The first threshold is the minimum DC voltage value required for the receiving chip to communicate with the wireless charging device. When the voltage value of the DC voltage is greater than or equal to the second threshold, the receiving chip can communicate with the processor of the electronic device to perform charging configuration, for example, configuring the charging voltage, configuring the charging current, etc. When the voltage value of the DC voltage is greater than or equal to the third threshold, the power supply in the electronic device is charged.

[0105] The first threshold value may be 1V, 2V, or other values; the second threshold value may be 5V, 6V, or other values; the third threshold value may be 5.5V, 6.5V, or other values; the embodiment of the present application does not limit the specific values ​​of the first threshold value, the second threshold value, and the third threshold value.

[0106] On the basis of the above charging process, the processor of the electronic device can also communicate with the wireless charging device through the receiving chip 202 and the receiving coil 201 according to the battery power to adjust the magnetic field energy output by the wireless charging device. Exemplarily, the processor 206 of the electronic device can communicate with the wireless charging device through the receiving chip when the power of the power supply is low (for example, less than 80%) to request more magnetic field energy from the wireless charging device to achieve fast charging of the power supply. The processor of the electronic device can communicate with the wireless charging device through the receiving chip when the power of the power supply is high (for example, greater than 80%) to request the wireless charging device to reduce the magnetic field energy to achieve charging of the power supply.

[0107] In some embodiments, a switch 207 is further provided between the receiving chip 202 and the power supply 204. The switch 207 is used to close when the DC voltage is greater than the third threshold value to realize charging of the power supply 204. The switch 2023 can be controlled by the processor 206 or by the receiving chip 202. The switch 207 can be located in the receiving chip 202 or can be independent of the receiving chip 202. The switch 207 can be a single-pole single-throw switch, a switch tube, or other types of switches. The embodiment of the present application does not specifically limit the specific position, structure, etc. of the switch 207. In some embodiments, a voltage adjustment module 203 is further provided between the receiving chip 202 and the power supply 204. The input end of the voltage adjustment module is connected to the third end 1c of the receiving chip 202, and the output end of the voltage adjustment module is connected to the power supply 204. The voltage adjustment module 203 is used to process the DC voltage converted by the receiving chip 202 to provide a suitable charging voltage for the power supply 204. The voltage adjustment module 203 can include a boost circuit or a buck circuit. The embodiment of the present application does not limit the structure of the voltage adjustment module 203 .

[0108] On the basis of the above embodiment, a switch is further provided between the receiving chip 202 and the power supply module 205. When the receiving coil receives the magnetic field energy, the switch is closed to enable the power supply module 205 to supply power to the receiving chip 202; when the receiving coil does not receive the magnetic field energy, the switch is opened to interrupt the power supply module 205 from supplying power to the receiving chip 202. In this way, when the receiving coil does not receive the magnetic field energy, the power supply module 205 is interrupted to supply power to the receiving chip 202, which can reduce the power supply time of the electronic device to the receiving chip and reduce the power consumption of the electronic device.

[0109] For example, Figure 2 As shown, the wireless charging circuit further includes: a switch 208 . Exemplarily, one end of the switch 208 is connected to the fourth end 1d of the receiving chip 202 , and the other end of the switch 208 is connected to the power supply module 205 . The switch 208 is controlled by the processor 206 .

[0110] The processor 206 is used to control the switch 208 to close when the voltage value of the DC voltage is greater than or equal to the first threshold value, so that the power supply module 205 supplies power to the receiving chip 202. The processor 206 is used to control the switch 208 to open when the voltage value of the DC voltage is less than the first threshold value, so as to interrupt the power supply module 205 to the receiving chip 202.

[0111] In the above Figure 2 Based on the shown embodiment, the processor 206 can obtain the voltage value of the DC voltage through an analog-to-digital converter (ADC), and then confirm that the voltage value of the DC voltage is greater than or equal to the first threshold; the processor 206 can also confirm that the voltage value of the DC voltage is greater than or equal to the first threshold through a detection unit.

[0112] For example, the processor 206 obtains the voltage value of the DC voltage through the analog-to-digital converter (ADC), such as Figure 3 As shown, the wireless charging circuit further includes: a first voltage divider unit 301, a second voltage divider unit 302, and an analog-to-digital converter 303. The first end of the first voltage divider unit 301 is connected to the output end of the rectifier bridge 2021, the second end of the first voltage divider unit 301 is connected to the first end of the second voltage divider unit 302, and the second end of the second voltage divider unit 302 is grounded. The first end of the analog-to-digital converter 303 is connected to the second end of the first voltage divider unit 301, and the second end of the analog-to-digital converter 303 is connected to the processor 206.

[0113] The first voltage divider unit 301 and the second voltage divider unit 302 are used to divide the DC voltage. The first voltage divider unit 301 may include one or more resistors, and the second voltage divider unit 302 may include one or more resistors, which is not limited in the embodiment of the present application. In an example, the resistance value of the resistor in the first voltage divider unit 301 may be 56K, and the resistance value of the resistor in the second voltage divider unit 340 may be 150K, which is not specifically limited here. In this way, the voltage division function can be achieved by resistors, the solution is simple, and the cost is low.

[0114] The analog-to-digital converter 303 is used to collect the analog voltage at the second end of the first voltage dividing unit 301 and convert the analog voltage into a digital voltage.

[0115] The processor 206 is used to obtain a voltage value of the DC voltage according to the digital voltage, and to control the switch 208 to close when the DC voltage is greater than or equal to a first threshold value, so as to control the power supply module 205 to supply power to the receiving chip 202 .

[0116] It can be understood that the first voltage divider unit 301 and the second voltage divider unit 302 are connected in series to share the DC voltage generated by the receiving chip 202, and the sum of the voltage of the first voltage divider unit 301 and the voltage of the second voltage divider unit 302 is equal to the DC voltage generated by the receiving chip 202. If the voltage division ratio of the first voltage divider unit 301 and the second voltage divider unit 302 and the voltage of the second voltage divider unit 302 (that is, the voltage at the second end of the first voltage divider unit 301) are known, the DC voltage can be calculated.

[0117] Below Figure 3 The working process of the circuit shown is explained.

[0118] When the electronic device is not placed on the wireless charging device, the switch 208 is turned on to interrupt the power supply from the power supply module to the receiving chip.

[0119] When the electronic device is placed on the wireless charging device, the receiving coil 201 couples to the magnetic field energy and outputs an AC voltage. The receiving chip 202 converts the AC voltage into a DC voltage and obtains the voltage value of the DC voltage. The analog-to-digital converter 303 transmits the digital voltage to the processor 206. The processor 206 obtains the voltage value of the DC voltage based on the digital voltage. And when the DC voltage is greater than or equal to the first threshold, the control switch 208 is closed to realize the power supply module to the receiving chip 202. After the receiving chip 202 is powered on, the charging process begins. The charging process can refer to the corresponding description above and is not limited here.

[0120] In this way, the processor can obtain the voltage value of the DC voltage through the analog-to-digital converter to control the switch 208. When the voltage value of the DC voltage is less than the first threshold, the switch 208 is controlled to open, and the power supply module 205 is stopped to save energy.

[0121] Above Figure 3 In the circuit shown, the processor obtains the voltage value of the DC voltage through the analog-to-digital converter to control the switch 208. Figure 4 Another implementation method is described.

[0122] For example, Figure 4 A schematic diagram of a wireless charging circuit provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the wireless charging circuit further includes: a detection unit 401.

[0123] One end of the detection unit 401 is connected to a port of the receiving chip 202 that outputs a DC voltage (eg, a sixth end 1 f of the receiving chip 202 ), and the other end of the detection unit 401 is connected to the processor 206 .

[0124] The detection unit 401 is used to detect the DC voltage converted by the receiving chip 202. When the detection unit 401 detects that the DC voltage is greater than or equal to the first threshold, the detection unit 401 transmits an interrupt signal to the processor 206. After receiving the interrupt signal, the processor 206 controls the switch 208 to close, and then the power supply module 205 supplies power to the receiving chip 202, so that the receiving chip 202 is in a power-on state.

[0125] Below Figure 4 The working process of the circuit shown is explained.

[0126] When the electronic device is not placed on the wireless charging device, the switch 208 is turned on to interrupt the power supply from the power supply module to the receiving chip.

[0127] When the electronic device is placed on the wireless charging device, the receiving coil 201 couples to the magnetic field energy and outputs an AC voltage. The receiving chip converts the AC voltage into a DC voltage. When the detection unit 401 detects that the DC voltage is greater than or equal to the first threshold, the detection unit 401 transmits an interrupt signal to the processor 206. After receiving the interrupt signal, the processor 206 controls the switch 208 to close, so that the power supply module supplies power to the receiving chip. The receiving chip 202 is in a power-on state and executes the charging process.

[0128] When the electronic device leaves the wireless charging device, the processor 206 controls the switch 208 to open.

[0129] In this way, the receiving chip 202 is powered by the power supply module in the electronic device. When the receiving coil is coupled to the magnetic field energy, the receiving chip 202 is powered on and enters the charging process to achieve wireless charging. When the receiving coil is not coupled to the magnetic field energy, the receiving chip 202 is not powered on, saving energy consumption.

[0130] The structure of the detection unit 401 is described below. Figure 4 As shown, the detection unit 401 may include: a switch tube Q1 and a resistor R1. The control electrode of the switch tube Q1 is connected to the port of the receiving chip 202 that outputs the DC voltage (for example, the output end of the rectifier bridge 2021); the first electrode of the switch tube Q1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the first interface 402. The second electrode of the switch tube Q1 is grounded. The first electrode of the switch tube Q1 is connected to the first pin of the processor 206.

[0131] The first interface 402 may be an input / output interface (I / O interface), for example, a general purpose input / output interface (GPIO interface). The GPIO interface may be an interface on a system IO power supply. The embodiment of the present application does not limit the specific module corresponding to the first interface.

[0132] In the embodiment of the present application, when the switch tube Q1 switches from off to on, the processor 206 detects that the level at the first pin switches, that is, when a falling edge or a rising edge is detected, the processor 206 obtains an interrupt signal.

[0133] The switch tube Q1 can be an N-type switch tube or a P-type switch tube. Exemplarily, when the switch tube Q1 is an N-type switch tube, the first interface 402 is used to output a high level. When the processor 206 detects a falling edge, an interrupt signal is obtained.

[0134] For example, the switch tube Q1 is NMOS and the first interface 402 is used to output a 1.8V voltage. Figure 4 The gate (G pole) of the middle switch tube Q1 is connected to the port that outputs the DC voltage in the receiving chip 202 (for example, the output end of the rectifier bridge 2021); the drain (D pole) of the switch tube Q1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the first interface 402.

[0135] The processor 206 is used to control the switch 208 to close when a falling edge is detected, so that the power supply module 205 can supply power to the receiving chip 202 .

[0136] It can be understood that when the DC voltage output by the receiving chip 202 is less than the first threshold value, or when no DC voltage is output, the first difference (Vgs) of the switch tube Q1 is less than the threshold voltage of the switch tube Q1, the switch tube Q1 is turned off, the first pole of the switch tube Q1 maintains a voltage of 1.8V, and the processor 206 detects a high level. The first difference of the switch tube Q1 is the difference between the voltage at the first pole and the voltage at the second pole of the switch tube Q1. The threshold voltage can also be called a turn-on voltage, a conduction threshold voltage, etc.

[0137] When the DC voltage outputted by the receiving chip 202 is greater than or equal to the first threshold value, the first difference of the switch tube Q1 is greater than or equal to the threshold voltage of the switch tube Q1, the switch tube Q1 is turned on, the first pole of the switch tube Q1 is 0V, and the processor 206 detects a low level. When the processor 206 detects a falling edge, the processor 206 controls the switch 208 to close, so that the power supply module 205 supplies power to the receiving chip 202.

[0138] In this way, the detection of DC voltage and the transmission of interrupt signal are realized according to the characteristics of the switch tube. The structure is simple and easy to realize.

[0139] The resistor R1 is used to limit the current flowing through the switch tube Q1 when the switch tube Q1 is turned on. In this way, the current flowing through the switch tube Q1 can be limited, and the probability of damage to the switch tube Q1 due to excessive current can be reduced.

[0140] In the above Figure 4 Based on the embodiment shown, the circuit further includes: a resistor R2. The resistor R2 is used to limit the current flowing through the detection unit 401. Exemplarily, the resistor R2 is used to limit the current between the control electrode and the second electrode of the switch tube Q1 to reduce damage to the switch tube Q1.

[0141] One end of the resistor R2 is connected to the sixth end 1f of the receiving chip 202 , and the other end of the resistor R2 is connected to the detection unit 401 (eg, the control electrode of the switch tube Q1 ).

[0142] The resistor R2 may be located between the receiving chip 202 and the detection unit 401, or in the detection unit 401, or in the receiving chip 202. The resistance value of the resistor R2 may be 50K, 56K, or other values. The embodiment of the present application does not limit the position, resistance value, etc. of the resistor R2.

[0143] In this way, the current flowing through the detection unit 401 can be limited, thereby reducing the probability of the detection unit 401 being damaged due to excessive DC voltage.

[0144] Based on the above embodiment, a switch or switch tube Q3 is further provided between the receiving chip 202 and the detection unit 401. The switch and the switch tube Q3 are used to interrupt the connection between the receiving chip 202 and the detection unit 401 after the receiving chip 202 is powered on.

[0145] It should be noted that when the power source is wirelessly charged, the magnetic field energy received by the receiving coil is relatively large, and thus the DC voltage output by the receiving chip 202 is relatively large, which may damage the detection unit 401 .

[0146] In this way, the damage of the detection unit 401 caused by the large DC voltage output by the receiving chip 202 can be reduced, and the life of the detection unit 401 can be extended. In addition, the voltage resistance requirement of the detection unit 401 can be reduced, and the cost can be reduced.

[0147] For example, Figure 5 As shown, the wireless charging circuit includes a switch 501. A first end of the switch 501 is connected to the receiving chip 202, and a second end of the switch 501 is connected to the detection unit 401. Exemplarily, the second end of the switch 501 is connected to the detection unit 401.

[0148] The switch 501 is used to open after the switch 208 is closed to interrupt the connection between the receiving chip 202 and the detection unit 401; the switch 501 is used to close when the receiving chip 202 is not powered on to enable the detection unit 401 to detect the DC voltage.

[0149] When the electronic device leaves the wireless charging device, the processor 206 controls the switch 501 to close.

[0150] For example, Figure 6 As shown, the first electrode of the switch tube Q3 is connected to one end of the detection unit 401 , the second end of the switch tube Q3 is grounded, and the control electrode of the switch tube Q3 is connected to the processor 206 .

[0151] The switch tube Q3 is used to be turned on after the switch 208 is closed to interrupt the connection between the receiving chip 202 and the detection unit 401; the switch tube Q3 is used to be turned off when the receiving chip 202 is not powered on to enable the detection unit 401 to detect the DC voltage.

[0152] In this way, the detection of the detection unit 401 during operation can be reduced, the damage of the detection unit 401 due to the large DC voltage output by the receiving chip 202 can be reduced, and the life of the detection unit 401 can be extended. In addition, the voltage resistance requirement of the detection unit 401 can be reduced, and the cost can be reduced.

[0153] When the electronic device leaves the wireless charging device, the processor 206 controls the switch tube Q3 to turn off.

[0154] In some embodiments, the switch tube Q3 may be located between the resistor R2 and the switch tube Q1 , so that the current flowing through the switch tube Q2 can be limited, and the probability of damage to the switch tube Q3 due to excessive current can be reduced.

[0155] Above Figures 3 to 6 In the illustrated embodiment, the processor 206 confirms the opening or closing of the switch 208 according to the voltage value of the DC voltage. The processor 206 may also confirm the opening or closing of the switch 208 according to the voltage value of the AC voltage.

[0156] Combine the following Figures 7 to 9 The wireless charging circuit provided in the embodiment of the present application is described.

[0157] For example, Figure 7 This is a schematic diagram of the structure of a wireless charging circuit provided in an embodiment of the present application. Figure 7 As shown, in Figure 2 On the basis of the circuit shown, the wireless charging circuit further includes: a detection unit 701 .

[0158] One end of the detection unit 701 is connected to one end of the receiving coil 201 , and the other end of the detection unit 701 is connected to the processor 206 .

[0159] The detection unit 701 is used to detect the AC voltage output by the receiving coil 201. When the detection unit 701 detects that the AC voltage is greater than or equal to the fourth threshold, the detection unit 701 transmits an interrupt signal to the processor 206. After receiving the interrupt signal, the processor 206 controls the switch 208 to close, and then the power supply module 205 supplies power to the receiving chip 202, so that the receiving chip 202 is in a power-on state.

[0160] The fourth threshold value may be 0.9V, or 1.5V or other values, and the specific value of the fourth threshold value is not limited in the embodiment of the present application. The fourth threshold value is the minimum voltage required for the electronic device to communicate with the wireless charging device.

[0161] In this way, the receiving chip 202 is powered by the power supply module in the electronic device. When the magnetic field energy coupled to the receiving coil is small, the receiving chip 202 can be turned on to enter the charging process to achieve wireless charging. When the receiving coil is not coupled to the magnetic field energy, the receiving chip 202 is turned off to save energy.

[0162] Below Figure 7 The working process of the circuit shown is explained.

[0163] When the electronic device is not placed on the wireless charging device, the switch 208 is turned on to interrupt the power supply from the power supply module to the receiving chip.

[0164] When the electronic device is placed on the wireless charging device, the receiving coil 201 couples to the magnetic field energy and outputs an AC voltage. When the detection unit 701 detects that the AC voltage is greater than or equal to the fourth threshold, the detection unit 701 transmits an interrupt signal to the processor 206. After receiving the interrupt signal, the processor 206 controls the switch 208 to close, so that the power supply module supplies power to the receiving chip. The receiving chip 202 is in a powered-on state and executes the charging process.

[0165] The structure of the detection unit 701 is described below. Figure 7 As shown, the detection unit 701 may include: a switch tube Q4 and a resistor R3.

[0166] The control electrode of the switch tube Q4 is connected to one end of the receiving coil 201; the first electrode of the switch tube Q4 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the first interface 702. The second electrode of the switch tube Q4 is grounded. The first electrode of the switch tube Q4 is connected to the processor 206.

[0167] The structure and function of the first interface 702 refer to the above corresponding description, which will not be repeated here.

[0168] In the embodiment of the present application, when the switch tube Q3 switches from off to on, the processor 206 detects that the level at the first pin switches, that is, when a falling edge or a rising edge is detected, the processor 206 obtains an interrupt signal.

[0169] The switch tube Q3 can be an N-type switch tube or a P-type switch tube. Exemplarily, when the switch tube Q3 is an N-type switch tube, the first interface 702 is used to output a high level. When the processor 206 detects a falling edge, an interrupt signal is obtained.

[0170] For example, the switch tube Q3 is NMOS and the first interface 702 is used to output a 1.8V voltage. Figure 7 The gate (G pole) of the middle switch tube Q3 is connected to the port that outputs the DC voltage in the receiving chip 202 (for example, the output end of the rectifier bridge 2021); the drain (D pole) of the switch tube Q3 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the first interface 402.

[0171] The processor 206 is used to control the switch 208 to close when a falling edge is detected, so that the power supply module 205 can supply power to the receiving chip 202 .

[0172] It can be understood that when the AC voltage output by the receiving chip 202 is less than the third threshold value, or when no DC voltage is output, the first difference (Vgs) of the switch tube Q3 is less than the threshold voltage of the switch tube Q1, the switch tube Q3 is turned off, the first pole of the switch tube Q3 maintains a voltage of 1.8V, and the processor 206 detects a high level. The first difference of the switch tube Q3 is the difference between the voltage at the first pole and the voltage at the second pole of the switch tube Q3.

[0173] When the DC voltage outputted by the receiving chip 202 is greater than or equal to the first threshold value, the first difference of the switch tube Q3 is greater than or equal to the threshold voltage of the switch tube Q3, the switch tube Q3 is turned on, the first pole of the switch tube Q3 is 0V, and the processor 206 detects a low level. When the processor 206 detects a falling edge, the processor 206 controls the switch 208 to close, so that the power supply module 205 supplies power to the receiving chip 202.

[0174] In this way, the detection of DC voltage and the transmission of interrupt signal are realized according to the characteristics of the switch tube. The structure is simple and easy to realize.

[0175] The resistor R3 is used to limit the current flowing through the switch tube Q4 when the switch tube Q4 is turned on. In this way, the current flowing through the switch tube Q4 can be limited, and the probability of damage to the switch tube Q4 due to excessive current can be reduced.

[0176] In the above Figure 7 Based on the embodiment shown, the circuit further includes a resistor R4. The resistor R4 is used to limit the current flowing through the detection unit 701. Exemplarily, the resistor R4 is used to limit the current between the control electrode and the second electrode of the switch tube Q4 to reduce damage to the switch tube Q4.

[0177] The resistor R4 may be located between the receiving coil 201 and the detection unit 701, or may be located inside the detection unit 701. The resistance of the resistor R4 may be 50K, 56K, or other values. The embodiment of the present application does not limit the position, resistance, etc. of the resistor R4.

[0178] In this way, the current flowing through the detection unit 701 can be limited, thereby reducing the probability of the detection unit 701 being damaged due to excessive AC voltage.

[0179] On the basis of the above embodiment, a switch or a switch tube Q5 is further provided between the receiving coil 201 and the detection unit 701. The switch and the switch tube Q3 are both used to interrupt the connection between the receiving coil 201 and the detection unit 701 after the receiving chip 202 is powered on. In this way, the damage to the detection unit 701 due to the large AC voltage output by the receiving coil 201 can be reduced, and the life of the detection unit 701 can be extended. In addition, the voltage resistance requirement of the detection unit 701 can also be reduced, thereby reducing the cost.

[0180] For example, Figure 8 As shown, the wireless charging circuit further includes a switch 801. A first end of the switch 801 is connected to one end of the receiving coil 201, and a second end of the switch 801 is connected to the detection unit 701. Exemplarily, the second end of the switch 801 is connected to the control electrode of the switch tube Q3.

[0181] The switch 801 is used to open after the switch 208 is closed to interrupt the connection between the receiving coil 201 and the detection unit 701; the switch 801 is used to close when the receiving chip 202 is not powered on to enable the detection unit 701 to detect the AC voltage.

[0182] When the electronic device leaves the wireless charging device, the processor 206 controls the switch 801 to close.

[0183] For example, Fig. 9 As shown, the wireless charging circuit includes a switch tube Q5 . The control electrode of the switch tube Q5 is connected to the processor 206 ; the first electrode of the switch tube Q5 is connected to the receiving coil 201 , and the second electrode of the switch tube Q5 is connected to the detection unit 701 .

[0184] The switch tube Q5 is used to conduct after the switch 208 is closed, so as to interrupt the connection between the receiving coil 201 and the detection unit 701. In this way, the detection unit 701 can be turned off, reducing the damage to the detection unit 701 when the magnetic field energy coupled to the receiving coil is large, reducing the voltage resistance requirement of the detection unit 701, and reducing the cost.

[0185] The switch tube Q5 is used to turn off when the receiving chip 202 is not powered on, so as to realize the detection of the AC voltage by the detection unit 701. In this way, the detection unit 701 can detect the AC voltage output by the receiving coil 201, so that the subsequent processor can determine whether the power supply module 205 needs to power the receiving chip 202.

[0186] When the electronic device leaves the wireless charging device, the processor 206 controls the switch tube Q5 to be turned off.

[0187] In the above Figures 4 to 9 On the basis of the embodiment shown, the fourth terminal 1d of the receiving chip 202 is also connected to a port (e.g., an output terminal of the rectifier bridge 2021) that outputs a DC voltage in the receiving chip 202. After receiving the interrupt signal, the processor 206 is also used to obtain the state of the receiving chip 202 through the fifth terminal 1e of the receiving chip 202.

[0188] Specifically, when the processor 206 obtains that the receiving chip 202 is not powered on (is in the off state), the control switch 208 is closed; when the processor 206 obtains that the receiving chip 202 is in the powered state, the control switch 208 is opened or no processing is performed.

[0189] The processor 206 can read the voltage value of the DC voltage in the receiving chip 202 through the I2C data line (for example, obtained from the control module 2022). When the reading fails, the processor 206 confirms that the receiving chip 202 is not powered on.

[0190] In some embodiments, the processor may read the voltage value of the DC voltage in the receiving chip 202 N times in succession to increase the accuracy of the judgment of the receiving chip 202 .

[0191] It is understandable that when the magnetic field energy coupled by the receiving coil is large, the DC voltage output by the receiving chip 202 is greater than or equal to the operating voltage of the receiving chip 202. The electronic device can power the receiving chip 202 through the receiving coil without the need for power supply module 205. When the magnetic field energy coupled by the receiving coil is small, the DC voltage output by the receiving chip 202 is less than the operating voltage of the receiving chip 202, and power supply module 205 is required.

[0192] In this way, when the magnetic field energy coupled by the receiving coil is large, the electronic device uses the magnetic field energy coupled by the receiving coil to power the receiving chip, saving energy consumption. When the magnetic field energy coupled by the receiving coil is small, the electronic device uses the power supply module to power the receiving chip to achieve wireless charging.

[0193] Based on the above embodiment, the processor 206 obtains the voltage value of the DC voltage output by the receiving chip 202 after controlling the switch 208 to close for a preset time. When the voltage value of the DC voltage is less than the second threshold, the processor 206 controls the second switch 208 to open to interrupt the power supply of the power supply module.

[0194] The preset duration may be 4 seconds, 6 seconds, or other values, which are not specifically limited here.

[0195] In this way, when the magnetic field energy coupled to the receiving coil is continuously small and insufficient to charge the electronic device, the power supply module can be interrupted to save energy. When the electronic device is placed on the wireless charging device and removed within a short period of time, the power supply module can be interrupted to save energy.

[0196] In some embodiments, after receiving the interrupt signal, the processor 206 obtains the status of the receiving chip 202 multiple times within a first preset time period. When the multiple obtained statuses are all that the receiving chip is not powered on, the processor controls the second switch to close.

[0197] On the basis of the above embodiment, when the receiving chip is in a powered-on state and the voltage value of the DC voltage is less than the working voltage of the receiving chip within the first preset time period, the processor controls the switch 208 to be closed.

[0198] The operating voltage of the receiving chip may be 3.5 V or 4 V. This embodiment of the present application does not specifically limit this.

[0199] In some embodiments, when the processor 206 obtains that the voltage value of the DC voltage in the receiving chip 202 is less than the working voltage of the receiving chip 202, the control switch 208 is closed. In this way, when the receiving coil is turned on and the power supply to the receiving chip is insufficient, the power supply can also be charged.

[0200] It is understandable that in addition to the charging process, the receiving chip 202 may also perform firmware burning, reverse charging, etc. After the receiving chip is powered on, the status of the receiving chip may include: burning status, reverse charging status, non-burning status, non-reverse charging status, etc. The burning status is used to indicate that the software firmware is being written to the receiving chip 202. The reverse charging status is used when the electronic device is reverse charging to wirelessly charge other devices. The non-burning status is used to indicate that the software firmware has been written to the receiving chip 202. The non-reverse charging status is used when the electronic device is not reverse charging.

[0201] In some embodiments, when the processor 206 obtains that the receiving chip 202 is in a non-burning state and a non-reverse charging state, and the voltage value of the DC voltage is less than the operating voltage of the receiving chip, the switch 208 is controlled to be closed. In this way, when the receiving chip implements other functions such as firmware burning and reverse charging, the switch 208 is not closed. When the receiving chip does not implement other functions such as firmware burning and reverse charging, the power supply is charged.

[0202] Based on the above embodiment, the processor 206 obtains the voltage value of the DC voltage output by the receiving chip 202 after controlling the switch 208 to close for a second preset time. When the voltage value of the DC voltage is less than the second threshold, the processor 206 controls the switch 208 to open to interrupt the power supply of the power supply module.

[0203] The second preset time length may be 4 seconds, 6 seconds or other values, which are not specifically limited here.

[0204] In this way, when the magnetic field energy coupled to the receiving coil is continuously small and insufficient to charge the electronic device, the power supply module can be interrupted to save energy. When the electronic device is placed on the wireless charging device and removed within a short period of time, the power supply module can be interrupted to save energy.

[0205] In the above Figures 2 to 9On the basis of the embodiment shown, the electronic device can also be charged by connecting the charger via a data cable. The charging circuit of the electronic device also includes: a switch and a charging interface. The charging interface is used to connect an external power source; the switch is used to close when the charging interface is connected to an external power source to charge the power supply in the electronic device. The switch is used to close when the charging interface is not connected to an external power source to reduce leakage of the charging interface.

[0206] For example, Fig. 9 As shown, the wireless charging circuit further includes: a charging interface 901 and a switch 902 . The charging interface 901 is connected to one end of the switch 902 , and the other end of the switch 902 is connected to the power source 204 .

[0207] The charging interface 901 is used to connect an external power source; the switch 902 is used to close when the charging interface is connected to the external power source to charge the power source 204 in the electronic device. The switch 902 is used to close when the charging interface is not connected to the external power source to reduce the leakage of the charging interface 901.

[0208] The wireless charging circuit is described above, and the wireless charging method is described below.

[0209] For example, Fig.10 A flow chart of a wireless charging method provided in an embodiment of the present application. Fig.10 As shown, the method includes:

[0210] S1001. When the electronic device is placed on the wireless charging device, the receiving coil is coupled to the magnetic field energy and outputs an AC voltage.

[0211] S1002. The receiving chip converts the AC voltage into a DC voltage.

[0212] S1003: When the detection unit detects that the voltage value of the DC voltage is greater than or equal to the first threshold, or the voltage value of the AC voltage is greater than or equal to the fourth threshold, the detection unit transmits an interrupt signal to the processor.

[0213] S1004 , after receiving the interrupt signal, the processor controls the switch 208 to close, so that the power supply module supplies power to the receiving chip.

[0214] Optionally, after receiving the interrupt signal, the processor controls the second switch to close, including: after receiving the interrupt signal, the processor obtains the state of the receiving chip. When the receiving chip is in the off state, the processor controls the second switch to close.

[0215] In some embodiments, after receiving the interrupt signal, the processor obtains the state of the receiving chip N times in a first preset time. When the receiving chip obtained N times is not powered on, the processor controls the second switch to close.

[0216] It is understandable that when the processor does not read the voltage value of the DC voltage in the receiving chip through the I2C data line, the processor confirms that the receiving chip is not powered on.

[0217] On the basis of the above embodiment, when the receiving chip is powered on and the voltage value of the DC voltage is less than the working voltage of the receiving chip, the processor controls the switch 208 to close.

[0218] The operating voltage of the receiving chip may be 3.5 V or 4 V. This embodiment of the present application does not specifically limit this.

[0219] S1005. The receiving chip executes the charging process.

[0220] The charging process can refer to the above or below corresponding instructions, which will not be repeated here.

[0221] Optionally, after S1004, the method further includes: S1006.

[0222] S1006: The processor controls the detection unit to stop detecting the DC voltage or the AC voltage.

[0223] For example, the processor may control the switch 403 to be turned on, or the switch tube Q3 to be turned on. The processor may control the switch 801 to be turned on, or the switch tube Q5 to be turned on.

[0224] In this way, when the receiving chip detects that the voltage value of the DC voltage is greater than the second threshold, the connection between the detection unit and the receiving chip or the receiving coil is interrupted, thereby reducing damage to the detection unit when the DC voltage is too high or the AC voltage is too high.

[0225] On the basis of the above embodiment, after S1004, the method further includes: S1007 and S1008.

[0226] S1007 , after the processor controls the switch 208 to be closed for a preset time, obtain the voltage value of the DC voltage output by the receiving chip.

[0227] S1008: When the voltage value of the DC voltage is less than the second threshold, the processor controls the switch 208 to open to interrupt the power supply of the power supply module.

[0228] In this way, when the magnetic field energy coupled to the receiving coil is continuously small and insufficient to charge the electronic device, the power supply module can be interrupted to save energy. When the electronic device is placed on the wireless charging device and removed within a short period of time, the power supply module can be interrupted to save energy.

[0229] For example, Fig.11 A flow chart of a wireless charging method provided in an embodiment of the present application. Fig.11 As shown, the method includes:

[0230] S1101. The wireless charging device sends magnetic field energy outward.

[0231] Exemplarily, the wireless charging device periodically sends a ping signal.

[0232] S1102: When the electronic device is placed on the wireless charging device, the receiving coil in the electronic device receives the magnetic field energy and outputs an AC voltage. The receiving chip converts the AC voltage into a DC voltage.

[0233] When an electronic device is placed on a wireless charging device, the DC voltage in the receiving chip rises.

[0234] S1103: When the voltage value of the DC voltage is greater than or equal to the first threshold, or the voltage value of the AC voltage is greater than or equal to the fourth threshold, the detection unit in the electronic device transmits an interrupt signal to the processor.

[0235] S1104. After receiving the interrupt signal, the processor obtains the status information of the receiving chip.

[0236] S1103 and S1104 may also be replaced by, when the processor detects through the analog-to-digital converter that the voltage value of the DC voltage is greater than or equal to the first threshold, obtaining the status information of the receiving chip.

[0237] S1105: When the receiving chip meets the preset conditions, the processor controls the power supply module to supply power to the receiving chip. Adaptively, the receiving chip is powered on.

[0238] Exemplarily, the processor can control the switch 208 to be closed, so that the power supply module can supply power to the receiving chip.

[0239] The preset conditions include one or more of the following: the receiving chip is in a non-burning state, the receiving chip is in a non-reverse charging state, the receiving chip is not powered on (for example, the processor has not obtained the voltage value of the DC voltage for N consecutive times within a first preset time period), or the voltage value of the DC voltage in the receiving chip is continuously lower than the operating voltage of the receiving chip (for example, the voltage values ​​of the DC voltage obtained by the processor for N consecutive times within the first preset time period are all lower than the operating voltage of the receiving chip), etc.

[0240] The first preset time length may be 30 milliseconds or 50 milliseconds. The embodiment of the present application does not specifically limit the specific value of the first preset time length.

[0241] In some embodiments, the wireless charging method may not include a process of obtaining status information of the receiving chip. Exemplarily, when an interrupt signal is received or when the analog-to-digital converter detects that the voltage value of the DC voltage is greater than or equal to the first threshold, the processor controls the power supply module to power the receiving chip.

[0242] S1106. After the receiving chip is powered on, it communicates with the wireless charging device through the receiving coil to perform identity recognition, request more magnetic field energy output by the transmitting coil, etc. When the DC voltage is less than the second threshold, the receiving chip sends a first message to the wireless charging device, and the first message is used to request more magnetic field energy output by the transmitting coil. Adaptively, the voltage value of the DC voltage is increased.

[0243] Exemplarily, after the receiving chip is powered on, the charging process begins. The receiving chip can communicate with the wireless charging device to perform identity recognition, request more magnetic field energy output by the transmitting coil, etc. For example, the receiving chip can send an SS packet to the wireless charging device for identity recognition.

[0244] S1107: When the voltage value of the DC voltage is greater than the second threshold, the receiving chip sends a second message to the processor, where the second message is used to indicate wireless charging.

[0245] Exemplarily, the receiving chip may report an RX ready message to the processor to display a charging icon.

[0246] S1108. After receiving the second message, the processor performs charging configuration.

[0247] Charging configuration includes but is not limited to setting charging voltage, setting charging current, etc.

[0248] Control the receiving chip to charge the power supply.

[0249] S1109. When the voltage value of the DC voltage is greater than a third threshold, the receiving chip charges the power supply.

[0250] Exemplarily, when the voltage value of the DC voltage is greater than the third threshold, the receiving chip controls the switch 207 to close to charge the power supply.

[0251] In some embodiments, when the DC voltage is less than the second threshold value within a second preset time period after the processor controls the switch 208 to be closed, the processor controls the second switch to be opened.

[0252] The second preset time length can be 10 seconds or 8 seconds, which is not specifically limited here.

[0253] The circuit and method provided in the embodiment of the present application have been described above, and the device for executing the above method provided in the embodiment of the present application is described below. Those skilled in the art can understand that the method and the device can be combined and referenced with each other, and the relevant device provided in the embodiment of the present application can execute the steps in the above method.

[0254] The wireless charging method provided in the embodiment of the present application can be applied to electronic devices with wireless charging function. The electronic device includes a terminal device, and the specific device form of the terminal device can refer to the above related description, which will not be repeated here.

[0255] An embodiment of the present application provides an electronic device, which includes: a processor and a memory; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the electronic device executes the above method.

[0256] The embodiment of the present application provides a chip. The chip includes a processor, and the processor is used to call a computer program in a memory to execute the technical solution in the above embodiment. Its implementation principle and technical effect are similar to those of the above related embodiments, and will not be repeated here.

[0257] The embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium stores a computer program. The above method is implemented when the computer program is executed by the processor. The method described in the above embodiment can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the function can be stored as one or more instructions or codes on a computer-readable medium or transmitted on a computer-readable medium. Computer-readable media can include computer storage media and communication media, and can also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium that can be accessed by a computer.

[0258] In one possible implementation, a computer-readable medium may include RAM, ROM, compact disc read-only memory (CD-ROM) or other optical disk storage, disk storage or other magnetic storage devices, or any other medium that is intended to carry or store the required program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) is used to transmit software from a website, server or other remote source, the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of medium. Disks and optical disks as used herein include optical disks, laser disks, optical disks, digital versatile disks (DVD), floppy disks and Blu-ray disks, where disks usually reproduce data magnetically, while optical disks reproduce data optically using lasers. Combinations of the above should also be included in the scope of computer-readable media.

[0259] An embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is executed, the computer executes the above method.

[0260] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable device to generate a machine, so that the instructions executed by the processing unit of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0261] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0262] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wireless charging circuit, characterized in that: include: Receiving coil, receiving chip and power supply module; The receiving coil is used to receive magnetic field energy from the wireless charging device and output an AC voltage to the receiving chip; The receiving chip is used to convert the AC voltage into a DC voltage; The power supply module is used to supply power to the receiving chip, so that when the DC voltage is less than the working voltage of the receiving chip, the receiving chip is in a powered-on state.

2. The circuit according to claim 1, characterized in that The circuit further includes: a processor and a first switch; One end of the first switch is connected to the receiving chip, the other end of the first switch is connected to the power supply module, and the first switch is controlled by the processor; The processor is configured to control the first switch to be closed when the AC voltage is greater than or equal to a second value, so as to control the power supply module to supply power to the receiving chip; Alternatively, the processor is used to control the first switch to close when the DC voltage is greater than or equal to a first value, so as to control the power supply module to supply power to the receiving chip.

3. The circuit according to claim 2, characterized in that The circuit further comprises: a first detection unit; A first end of the first detection unit is connected to the receiving coil, and a second end of the first detection unit is connected to a first end of the processor; The first detection unit is configured to transmit a first interrupt signal to the processor when a voltage at a first terminal of the first detection unit is greater than or equal to the second value; The processor is specifically configured to control the first switch to close after receiving the first interrupt signal, so that the power supply module supplies power to the receiving chip.

4. The circuit according to claim 3, characterized in that The first detection unit includes: a first switch tube; The control electrode of the first switch tube is connected to the receiving coil, and the first electrode of the first switch tube is connected to the processor; The first switch tube is configured to be turned on when the voltage at the control end of the first switch tube is greater than or equal to a second value, and to be turned off when the voltage at the control end of the first switch tube is less than the second value, and when the first switch tube is switched from being turned off to being turned on, the level at the first end of the first switch tube is switched; The processor is specifically configured to control the first switch to be closed when a level switching occurs at the first end of the processor.

5. The circuit according to claim 4, characterized in that The circuit further includes: a first resistor; One end of the first resistor is connected to the first end of the first switch tube, and the other end of the first resistor is connected to the first interface, and the voltage output by the first interface is greater than or equal to the voltage represented by the high level that can be recognized by the first pin of the processor; The first resistor is used to limit the current generated by the voltage output by the first interface in the first switch tube to be less than a preset current.

6. The circuit according to any one of claims 3 to 5, characterized in that: The circuit further includes: a second switch tube; The control end of the second switch tube is connected to the second end of the processor, the first end of the second switch tube is connected to the first end of the first detection unit, and the second end of the second switch tube is grounded; The processor is further configured to control the second switch tube to be turned on after controlling the first switch to be closed, so as to interrupt the detection of the AC voltage by the first detection unit.

7. The circuit according to any one of claims 3 to 5, characterized in that: The circuit further includes: a second switch; The other end of the second switch is connected to the receiving coil, the other end of the second switch is connected to the first end of the first detection unit, and the second switch is controlled by the processor; The processor is further configured to control the second switch to open after controlling the first switch to close, so as to interrupt the detection of the AC voltage by the first detection unit.

8. The circuit according to any one of claims 3 to 7, characterized in that: The circuit further includes: a second resistor; the second resistor is located between the receiving coil and the first switch tube; One end of the second resistor is connected to the receiving coil, and the other end of the second resistor is connected to the control end of the first switch tube; The second resistor is used to limit the current flowing through the first switch tube to be less than a first preset current.

9. The circuit according to claim 2, characterized in that The receiving coil includes: a rectifier bridge; the rectifier bridge is used to convert the AC voltage into the DC voltage; The circuit further includes: a second detection unit; a first end of the second detection unit is connected to the output end of the rectifier bridge, and a second end of the second detection unit is connected to the first end of the processor; The second detection unit is configured to transmit a second interrupt signal to the processor when the voltage at the first end of the second detection unit is greater than or equal to the first value; The processor is specifically configured to control the first switch to close after receiving the second interrupt signal, so that the power supply module supplies power to the receiving chip.

10. The circuit according to claim 9, characterized in that The second detection unit includes: a third switch tube; The control electrode of the third switch tube is connected to the output end of the rectifier bridge, and the first electrode of the third switch tube is connected to the processor; The third switch tube is used to be turned on when the voltage at the control end of the first switch tube is greater than or equal to the first value, and turned off when the voltage at the control end of the second switch tube is less than the first value, and when the third switch tube is turned from off to on, the level at the first end of the first switch tube is switched; The processor is specifically configured to control the first switch to be closed when a level switching occurs at the first end of the processor.

11. The circuit according to claim 10, characterized in that The circuit further comprises: a third resistor; One end of the third resistor is connected to the first end of the second switch tube, and the other end of the third resistor is connected to the first interface, and the voltage output by the first interface is greater than or equal to the voltage represented by the high level that can be recognized by the first pin of the processor; The third resistor is used to limit the current generated by the voltage output by the first interface in the third switch tube to be less than a second preset current.

12. The circuit according to any one of claims 9 to 11, characterized in that: The circuit further comprises: a third switch; The other end of the third switch is connected to the receiving coil, the other end of the third switch is connected to the first end of the second detection unit, and the third switch is controlled by the processor; The processor is further configured to control the third switch to open after controlling the first switch to close, so as to interrupt the detection of the DC voltage by the second detection unit.

13. The circuit according to any one of claims 9 to 11, characterized in that: The circuit also includes: a fourth switch tube; the control end of the fourth switch tube is connected to the second end of the processor, the first end of the fourth switch tube is connected to the first end of the second detection unit, and the second end of the fourth switch tube is grounded; the processor is also used to control the fourth switch tube to turn on after controlling the first switch to close, so as to interrupt the second detection unit's detection of the AC voltage.

14. The circuit according to any one of claims 3 to 13, characterized in that: The processor is further configured to obtain a voltage value of the DC voltage after receiving the first interrupt signal or the second interrupt signal; The processor is specifically configured to control the first switch to be closed when the voltage value of the DC voltage is less than the working voltage, so as to control the power supply module to supply power to the receiving chip; The processor is specifically configured to control the first switch to open when the voltage value of the DC voltage is greater than or equal to the operating voltage, so as to disconnect the receiving chip from the power supply module.

15. The circuit according to any one of claims 3 to 14, characterized in that: The processor is further configured to obtain status information of the receiving chip after receiving the first interrupt signal or the second interrupt signal; The processor is specifically configured to control the first switch to be closed, so as to control the power supply module to supply power to the receiving chip, when the status information is used to indicate that the receiving chip meets a preset condition; The processor is specifically configured to control the first switch to be turned on to interrupt the power supply of the power supply module to the receiving chip when the status information is used to indicate that the receiving chip does not meet the preset condition; The preset conditions include one or more of the following: the receiving chip is in a non-burning state, the receiving chip is in a non-reverse charging state, and the receiving chip is not powered on. The non-burning state is used to indicate that the receiving chip has not been firmware burned, and the non-reverse charging state is used to indicate that the receiving chip is not reversely charged.

16. The circuit according to claim 2, characterized in that The circuit further comprises: a rectifier bridge, a first voltage dividing unit, a second voltage dividing unit and an analog-to-digital converter ADC; A first end of the first voltage divider unit is connected to the output end of the rectifier bridge, a second end of the first voltage divider unit is connected to the first end of the second voltage divider unit, and a second end of the second voltage divider unit is grounded; one end of the ADC is connected to the second end of the first voltage divider unit, and the other end of the ADC is connected to the processor; The first voltage dividing unit and the second voltage dividing unit are used to divide the DC voltage; The ADC is used to collect the analog voltage at the second end of the first voltage dividing unit and convert the analog voltage into a digital voltage; The processor is used to control the first switch to be closed when the DC voltage is greater than or equal to a first value, so as to control the power supply module to supply power to the receiving chip.

17. The circuit according to any one of claims 2 to 16, characterized in that: The processor is further configured to obtain a voltage value of the DC voltage after controlling the first switch to be closed for a preset time period; When the voltage value of the DC voltage is less than a third value, the processor controls the first switch to open.

18. The circuit according to any one of claims 1 to 17, characterized in that: The circuit further includes: a fourth switch and a power supply; one end of the fourth switch is connected to the receiving chip, and the other end of the fourth switch is connected to the power supply; The receiving chip is further used to communicate with the wireless charging device through the receiving coil to increase the magnetic field energy when the voltage value of the DC voltage is less than a fourth value; The receiving chip is further used to communicate with the processor when the voltage value of the DC voltage is greater than or equal to a fourth value, so as to control the fourth switch to be closed, so that the power supply is charged.

19. A wireless charging method, characterized in that: Applied to the circuit according to any one of claims 2 to 15, the method comprising: The processor receives an interrupt signal, where the interrupt signal is used to indicate that a voltage value of the AC voltage is greater than or equal to a second value, or a voltage value of the DC voltage is greater than or equal to a first value, where the AC voltage is an AC voltage generated after the receiving coil receives magnetic field energy from the wireless charging device, and the DC voltage is obtained by the receiving chip converting the AC voltage; After receiving the interrupt signal, the processor controls the power supply module to supply power to the receiving chip, so that when the DC voltage is less than the working voltage of the receiving chip, the receiving chip is in a powered-on state.

20. An electronic device, characterized in that: The invention comprises the circuit described in any one of claims 1 to 18.

21. An electronic device, characterized in that: include: Processor and memory; The memory stores computer-executable instructions; the processor executes the computer-executable instructions, so that the terminal device executes the method according to claim 19.

22. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to claim 19 is implemented.

23. A computer program product, characterized in that include: A computer program which, when being executed, causes a computer to execute the method as claimed in claim 19.

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