Wireless charging circuit and device

Abstract

The utility model provides a wireless charging circuit and device, and the circuit is characterized in that the circuit comprises a control module, a power supply module, a communication module, a first wireless charging module, and a second wireless charging module; the power supply module is used for supplying power to the control module, the first wireless charging module and the second wireless charging module; the control module is used for communicating with the first type of equipment and / or the second type of equipment through the communication module; moreover, the control module is used for controlling the first wireless charging module to output first alternating current so as to charge the first type of equipment; moreover, the control module is used for controlling the second wireless charging module to output second alternating current so as to charge the second type of equipment; wherein the first alternating current is the alternating current of the first target power, and the second alternating current is the alternating current of the second target power. Charging of two different types of devices can be supported at the same time, and the charging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wireless charging, and particularly relates to a wireless charging circuit and device. BACKGROUND

[0002] In recent years, the popularity of wireless chargers for vehicles has swept the automobile accessory market, and is deeply embedded in the vehicle system architecture. From the perspective of technical evolution, early wireless charging focuses on the implementation of basic functions, and power adaptation is common for low-power charging of portable devices, which meets the demand for simple power supply in the vehicle scene. However, nowadays, the performance of smart phones has improved dramatically, with larger screens, 5G modules and other high-energy components implanted, and battery capacity expanded, which forces the charging power to rise from 5W, 10W to 30W, 60W or even higher, in order to shorten the charging time.

[0003] At the same time, consumers hold a growing variety of smart devices, with mobile phones, smart watches and wireless earphones becoming the "standard three-piece set" for travel, and a single charging position is insufficient. CONTENT OF THE UTILITY MODEL

[0004] The wireless charging circuit and device provided by the embodiments of the application can simultaneously support charging of two different types of devices, thereby improving the charging efficiency.

[0005] In a first aspect, the embodiments of the application provide a wireless charging circuit, comprising a control module, a power supply module, a communication module, a first wireless charging module and a second wireless charging module; the control module is connected with the power supply module, the communication module, the first wireless charging module and the second wireless charging module respectively, the power supply module is further connected with the first wireless charging module and the second wireless charging module respectively, and the power supply module is further connected with a direct current power supply; the power supply module is used to supply power to the control module, the first wireless charging module and the second wireless charging module; the control module is used to communicate with a first type of device and / or a second type of device through the communication module; the control module is used to control the first wireless charging module to output first alternating current to charge the first type of device; and the control module is used to control the second wireless charging module to output second alternating current to charge the second type of device; wherein the first alternating current is alternating current of a first target power, and the second alternating current is alternating current of a second target power.

[0006] In some embodiments, the communication module comprises a CAN communication unit, the CAN communication unit comprises a CAN chip and a CAN bus, and the CAN chip is connected with the control module through the CAN bus.

[0007] In some embodiments, the communication module further comprises an NFC communication unit, the NFC communication unit comprising an NFC chip and an NFC antenna, the NFC chip being connected with the NFC antenna and the control module respectively.

[0008] In some embodiments, the communication module further comprises an MPP authentication unit, the MPP authentication unit being connected with the control module.

[0009] In some embodiments, the first wireless charging module comprises a first boost-buck unit, a first full-bridge inverter unit, and a first coil; the first boost-buck unit is connected with the first full-bridge inverter unit, the control module, and the power supply module respectively; the first full-bridge inverter unit is connected with the first coil and the control module respectively; the first boost-buck unit is configured to receive direct current from the power supply module and boost or buck the direct current under the control of the control module; the first full-bridge inverter unit is configured to invert the direct current output by the first boost-buck unit under the control of the control module to output the first alternating current; and the first coil is configured to generate a first alternating magnetic field based on the first alternating current, so that a receiving coil of the first type of device generates a first induced current when in the first alternating magnetic field to charge the first type of device.

[0010] In some embodiments, the second wireless charging module comprises a second boost-buck unit, a second full-bridge inverter unit, and a second coil; the second boost-buck unit is connected with the second full-bridge inverter unit, the control module, and the power supply module respectively; the second full-bridge inverter unit is connected with the second coil and the control module respectively; the second boost-buck unit is configured to receive direct current from the power supply module and boost or buck the direct current under the control of the control module; the second full-bridge inverter unit is configured to invert the direct current output by the second boost-buck unit under the control of the control module to output the second alternating current; and the second coil is configured to generate a second alternating magnetic field based on the second alternating current, so that a receiving coil of the second type of device generates a second induced current when in the second alternating magnetic field to charge the second type of device.

[0011] In some embodiments, the power supply module further comprises a power interface; the power interface is connected with the first wireless charging module, the second wireless charging module, and the direct current power source respectively.

[0012] In some embodiments, the power supply module comprises a low-dropout linear regulator unit, the low-dropout linear regulator unit being connected with the control module; the low-dropout linear regulator unit is configured to supply power to the control module.

[0013] In some embodiments, the power supply module further comprises a voltage reduction unit; the voltage reduction unit is connected with the power supply interface, the communication module, the first wireless charging module and the second wireless charging module respectively.

[0014] In a second aspect, the embodiments of the present application provide a wireless charging device, which comprises the wireless charging circuit as described above.

[0015] Different from the prior art, the embodiments of the present application provide a wireless charging circuit and device. The wireless charging circuit comprises a control module, a power supply module, a communication module, a first wireless charging module and a second wireless charging module. The control module is connected with the power supply module, the communication module, the first wireless charging module and the second wireless charging module respectively. The power supply module is further connected with the first wireless charging module and the second wireless charging module respectively. Specifically, the power supply module is configured to supply power to the control module, the first wireless charging module and the second wireless charging module. The control module is configured to communicate with the first type of device and / or the second type of device through the communication module. The control module is configured to control the first wireless charging module to output first alternating current to charge the first type of device. The control module is configured to control the second wireless charging module to output second alternating current to charge the second type of device. The first alternating current is alternating current of a first target power, and the second alternating current is alternating current of a second target power. The wireless charging circuit and device provided by the embodiments of the present application can provide appropriate charging power for different devices, avoid slow charging or potential damage to the device battery caused by power mismatch, and thus improve the charging efficiency of each device. For example, charging according to the power required by each device can make the device achieve better charging effect in a shorter time. The wireless charging circuit can support charging of two different types of devices at the same time, thus expanding the application range of the wireless charging circuit. No matter whether the devices are of different brands, different models or different charging protocols, as long as they belong to the category of the first type of device or the second type of device, they have the opportunity to be charged on the wireless charging circuit, thus enhancing the universality and market competitiveness of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like reference numerals designate similar items in the figures, in which: the drawings do not limit the present application to the favorite drawings.

[0017] Figure 1 is a structural schematic diagram of the wireless charging circuit provided by some embodiments of the present application;

[0018] Figure 2is a structural schematic diagram of a wireless charging circuit provided by some embodiments of the present application. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0020] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0021] When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can be present therebetween.

[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class and do not limit the number of objects, for example, the first object can be one or more.

[0023] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a wireless charging circuit 100 provided by some embodiments of the present application.

[0024] The embodiments of the present application provide a wireless charging circuit 100, which comprises a control module 10, a power supply module 20, a communication module 30, a first wireless charging module 40 and a second wireless charging module 50.

[0025] The control module 10 is connected with the power supply module 20, the communication module 30, the first wireless charging module 40 and the second wireless charging module 50 respectively, the power supply module 20 is further connected with the first wireless charging module 40 and the second wireless charging module 50 respectively, and the power supply module 20 is further connected with a direct current power supply 200.

[0026] Specifically, the power supply module 20 is configured to supply power to the control module 10, the first wireless charging module 40 and the second wireless charging module 50. The control module 10 is configured to communicate with the first type of device and / or the second type of device through the communication module 30; and the control module 10 is configured to control the first wireless charging module 40 to output the first alternating current to charge the first type of device; and the control module 10 is configured to control the second wireless charging module 50 to output the second alternating current to charge the second type of device; wherein the first alternating current is the alternating current of the first target power, and the second alternating current is the alternating current of the second target power.

[0027] The first type of device is a device that is charged by the alternating current of the first target power. The second type of device is a device that is charged by the alternating current of the second target power. In some embodiments, the first target power is 25W, and the second target power is 50W. Specifically, the first type of device can be a 25W mobile phone or other device produced by Apple or other manufacturers, and the second type of device can be a private 50W mobile phone or other device produced by Xiaomi, OPPO, Huawei or other manufacturers.

[0028] In this embodiment, the first type of device has a receiving coil to perform energy transfer. The second type of device also has a receiving coil to perform energy transfer.

[0029] The direct current power supply 200 can be a vehicle-mounted direct current power supply, and the voltage can be 12V, 24V, etc.

[0030] In this embodiment, after the direct current input of the direct current power supply 200, the first wireless charging module 40 and / or the second wireless charging module 50 performs voltage reduction (or voltage increase) and inversion to form the first alternating current and / or the second alternating current, and the energy is emitted through the coil in the first wireless charging module 40 and / or the coil in the second wireless charging module 50.

[0031] Before the first wireless charging module 40 transmits energy, the control module 10 communicates with the receiving end device (i.e. the first type of device) through the communication module 30. The receiving end device (i.e. the first type of device) performs encrypted authentication with the control module 10, and after that, the first wireless charging module 40 can charge the receiving end device.

[0032] Before the second wireless charging module 50 transmits energy, the control module 10 communicates with the receiving end device (i.e. the second type of device) through the communication module 30. The receiving end device (i.e. the second type of device) reads the private key stored in the control module 10, so as to realize private coordination to charge the second type of device.

[0033] Please refer to Figure 2 , Figure 2is a structural schematic diagram of the wireless charging circuit 100 provided by some other embodiments of the present application.

[0034] In some embodiments, the communication module 30 includes a CAN communication unit 31, which includes a CAN chip 311 and a CAN bus 312, and the CAN chip 311 is connected with the control module 10 through the CAN bus 312. The CAN chip 311 can be of model SIT1043, or other chips with the same function.

[0035] Specifically, the CAN chip 311 is in communication connection with the control module 10, and provides a corresponding communication protocol for the communication between the control module 10 and external circuits.

[0036] In some embodiments, the communication module 30 further includes an NFC communication unit 32, which includes an NFC chip 321 and an NFC antenna 322, and the NFC chip 321 is connected with the NFC antenna 322 and the control module 10, respectively. The NFC chip 321 can be of model FM17660, or other chips with the same function.

[0037] Specifically, the NFC chip 321 is connected with the control module 10 through an SPI bus. The NFC chip 321 can realize data exchange between the control module 10 and external devices (such as the second type of device), and can also realize functions such as identity recognition, data transmission, and pairing connection.

[0038] In some embodiments, the communication module 30 further includes an MPP authentication unit 33, which is connected with the control module 10.

[0039] The MPP authentication unit 33 is a Secure Element (SE), which is a tamper-resistant hardware chip used for securely storing and processing sensitive information such as encryption keys, digital certificates, and payment credentials. It provides an isolated, highly secure environment to prevent unauthorized access, tampering, or theft of these critical data. The MPP authentication unit 33 can be a chip of model FM1230, or other chips with the same function.

[0040] Specifically, in the pairing and authentication process between the first type of device and the control module 10, the MPP authentication unit 33 participates in it. The MPP authentication unit 33 stores the identity authentication information and pairing key of the device, and interacts with the control module 10 through a secure encryption algorithm to verify the legitimacy of the other party. Just like in the wireless charging scenario, it works with the FM1230 chip to ensure that only authenticated first type of devices can charge in the right way, preventing unauthorized devices from accessing.

[0041] In some embodiments, the first wireless charging module 40 includes a first voltage conversion unit 41, a first full-bridge inverter unit 42, and a first coil 43.

[0042] The first voltage conversion unit 41 is connected to the first full-bridge inverter unit 42, the control module 10, and the power supply module 20, and the first full-bridge inverter unit 42 is connected to the first coil 43 and the control module 10.

[0043] Specifically, the first voltage conversion unit 41 receives direct current from the power supply module 20 and boosts or reduces the direct current under the control of the control module 10. The first full-bridge inverter unit 42 inverts the direct current output by the first voltage conversion unit 41 under the control of the control module 10 to output first alternating current. The first coil 43 generates a first alternating magnetic field based on the first alternating current to generate a first induced current in the receiving coil of the first type of device when the receiving coil is in the first alternating magnetic field, thereby charging the first type of device.

[0044] The first coil 43 is used for energy transmission with the first type of device, and the first type of device has a receiving coil.

[0045] In this embodiment, the first voltage conversion unit 41 receives direct current from the power supply module 20 and boosts or reduces the direct current to obtain processed direct current, which is transmitted to the first full-bridge inverter unit 42. The first full-bridge inverter unit 42 converts the received direct current into first alternating current and sends the obtained alternating current to the first coil 43, which generates a first alternating magnetic field according to the input first alternating current.

[0046] When the first alternating current passes through the first coil 43, a first alternating magnetic field is formed around the first coil 43 according to Ampere's law. The alternating current causes the magnetic field to change constantly, and the constantly changing magnetic field is the medium for electrical energy transmission. On this basis, when the first alternating magnetic field passes through the receiving coil of the first type of device, an alternating voltage is induced in the receiving coil of the first type of device according to Faraday's law of electromagnetic induction. The alternating voltage in the receiving coil of the first type of device is rectified and stabilized to convert it into a stable direct current signal for use by the first type of device.

[0047] In some embodiments, the second wireless charging module 50 includes a second voltage conversion unit 51, a second full-bridge inverter unit 52, and a second coil 53.

[0048] The second voltage conversion unit 51 is connected to the second full-bridge inverter unit 52, the control module 10, and the power supply module 20, and the second full-bridge inverter unit 52 is connected to the second coil 53 and the control module 10.

[0049] Specifically, the second voltage boosting and reducing unit 51 is configured to receive the direct current from the power supply module 20 and boost or reduce the voltage of the direct current under the control of the control module 10. The second full-bridge inverter unit 52 is configured to invert the direct current output by the second voltage boosting and reducing unit 51 under the control of the control module 10 to output the second alternating current. The second coil 53 is configured to generate the second alternating magnetic field based on the second alternating current, so that the receiving coil of the second type of device generates the second induced current when the receiving coil is in the second alternating magnetic field, thereby charging the second type of device.

[0050] The second coil 53 is configured to transfer energy to the second type of device, which has a receiving coil.

[0051] In this embodiment, the second voltage boosting and reducing unit 51 receives the direct current provided by the power supply module 20 and boosts or reduces the voltage of the direct current to obtain the processed direct current, which is transmitted to the second full-bridge inverter unit 52. The second full-bridge inverter unit 52 converts the received direct current into the second alternating current and sends the obtained alternating current to the second coil 53, which generates the second alternating magnetic field according to the input second alternating current.

[0052] When the second alternating current passes through the second coil 53, according to Ampere's law, the second alternating magnetic field is formed around the second coil 53. The alternating current causes the magnetic field to change constantly, and the constantly changing magnetic field is the medium for the transfer of electrical energy. On this basis, when the second alternating magnetic field passes through the receiving coil of the second type of device, according to Faraday's law of electromagnetic induction, an alternating voltage will be induced in the receiving coil of the second type of device. After rectification and voltage stabilization, the alternating voltage in the receiving coil of the second type of device can be converted into a stable direct current signal for use by the second type of device.

[0053] In some embodiments, the control module 10 is a chip of YTM32B1MD14 signal or other chips with the same function.

[0054] In some embodiments, the control module 10 is a chip of YTM32B1MD14 signal or other chips with the same function.

[0055] The first full-bridge inverter unit 42 and the second full-bridge inverter unit 52 are typically composed of four switching elements, which can be transistors, insulated gate bipolar transistors, field effect transistors, or other types of switching devices. By alternating the on and off states of the switching elements, the first full-bridge inverter unit 42 and the second full-bridge inverter unit 52 can generate an alternating voltage across the load, thereby achieving the conversion of direct current to alternating current. The control module 10 sends the generated PWM signal to the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52, which is sent to the drive circuit of the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52. The drive circuit controls the switching action of the switching elements according to the level state of the PWM signal, thereby achieving the control of the control module 10 on the on and off time of each switching element in the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52, so as to control the output power of the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52. The longer the on time of the switching element, the greater the output power of the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52, and the shorter the on time of the switching element, the smaller the output power of the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52. At the same time, by adjusting the frequency and amplitude of the PWM signal, the output frequency and output voltage of the first full-bridge inverter unit 42 and / or the second full-bridge inverter unit 52 can be controlled, thereby controlling the frequency and strength of the alternating magnetic field generated by the first coil 43 or the second coil 53.

[0056] The control module 10 controls the first full-bridge inverter unit 42 and the second full-bridge inverter unit 52 through the PWM signal, which can achieve fine control of the charging process, including adjusting the output power, frequency and waveform to adapt to different charging requirements and system conditions.

[0057] It can be understood that the hardware design of the control module 10 determines the number of PWM channels available inside it. The control module 10 usually has a fixed number of timers and counters, which are used to generate PWM signals, and the operation of each PWM channel will generate a certain power consumption. Too many PWM channels may cause the power consumption of the control module 10 to be too high, affecting the performance and thermal management of the control module 10. Therefore, the number of PWM channels of the control module 10 is limited.

[0058] Based on the above, the control module 10 is connected with the first and second voltage conversion units 41 and 51 through an I2C bus, which is used for transmitting control commands and feedback information. The control module 10 sends configuration parameters to the first and / or second voltage conversion units 41 and 51 through the I2C bus, so as to ensure that the first and / or second voltage conversion units 41 and 51 can provide the first and / or second full-bridge inverter units 42 and 52 with DC signals meeting the parameters. In addition, through the I2C bus, the control module 10 can detect whether the first and / or second voltage conversion units 41 and 51 have faults such as overheating, overloading or short circuit, and take protective measures in time.

[0059] In some embodiments, the power supply module 20 further comprises a power interface 21, which is connected with the first and second wireless charging modules 40 and 50 and the DC power supply 200 respectively.

[0060] Specifically, the power interface 21 can be a 2321709-5 model or other models capable of achieving the same function. The power interface 21 is used to connect with the DC power supply 200.

[0061] In some embodiments, the power supply module 20 comprises a low-dropout linear regulator unit 22, which is connected with the control module 10. Specifically, the low-dropout linear regulator unit 22 is used to supply power for the control module 10.

[0062] Specifically, the low-dropout linear regulator unit 22 can be a CJ6206A33M model or other models capable of achieving the same function.

[0063] In some embodiments, the power supply module 20 further comprises a voltage reduction unit 23, which is connected with the power interface 21, the communication module 30, the first and second wireless charging modules 40 and 50 respectively.

[0064] Specifically, the voltage reduction unit 23 can be an SC8101 model or other models capable of achieving the same function. The voltage reduction unit 23 is used to reduce the voltage of the DC power from the power interface 21 to obtain DC power with a preset voltage (for example, 5V), so as to supply power for the communication module 30, the first and second wireless charging modules 40 and 50.

[0065] The conventional wireless charging circuit can be designed for charging only a single type of device or a single device. The wireless charging circuit 100 provided by the embodiments of the present application can charge the first type of device and the second type of device at the same time by setting the first and second wireless charging modules, thereby solving the simultaneous charging demand of multiple different types of devices.

[0066] Different devices require different charging power due to battery capacity, charging protocol and other factors. The control module of the circuit can control the first wireless charging module to output AC power of the first target power to charge the first type of device, and the second wireless charging module to output AC power of the second target power to charge the second type of device, thereby solving the problem of different devices requiring different charging power.

[0067] The wireless charging circuit 100 comprises a communication module, and the control module communicates with different devices through the communication module, thereby integrating charging control and device communication. This solves the problem of being unable to effectively obtain device charging demand information and state feedback during wireless charging, and enables the charging circuit to accurately control according to the information fed back by the device (such as battery capacity, charging protocol requirements, etc.).

[0068] The wireless charging circuit 100 provided by the embodiments of the present application can provide appropriate charging power for different devices, thereby avoiding slow charging or potential damage to the device battery caused by power mismatch, and improving the charging efficiency of each device. For example, charging according to the respective required power of the devices can enable the devices to achieve better charging effect in a shorter time. The wireless charging circuit can support charging of two different types of devices at the same time, thereby expanding the application range of the wireless charging circuit. Whether the devices are of different brands, different models, or different charging protocols, as long as they fall within the scope of the first type or the second type of device, they have the opportunity to be charged on this wireless charging circuit, thereby enhancing the universality and market competitiveness of the product.

[0069] The embodiments of the present application also provide a wireless charging device comprising the wireless charging circuit 100 described above.

[0070] The wireless charging device can simultaneously charge the first type of device (such as a mobile phone or other device with a charging power of 25W) and the second type of device (such as a mobile phone or other device with a charging power of 50W).

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Under the concept of the present application, the technical features of the above embodiments or different embodiments can also be combined, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in detail. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents. These modifications or replacements do not change the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless charging circuit, comprising: The control module, the power supply module, the communication module, the first wireless charging module and the second wireless charging module are connected with each other. The control module is connected with the power supply module, the communication module, the first wireless charging module and the second wireless charging module. The power supply module is used for supplying power to the control module, the first wireless charging module and the second wireless charging module. The control module is used for communicating with the first type of device and / or the second type of device through the communication module.

2. The wireless charging circuit of claim 1, wherein, The communication module comprises a CAN communication unit, the CAN communication unit comprises a CAN chip and a CAN bus, and the CAN chip is connected with the control module through the CAN bus.

3. The wireless charging circuit of claim 2, wherein, The communication module further comprises an NFC communication unit, the NFC communication unit comprises an NFC chip and an NFC antenna, and the NFC chip is connected with the NFC antenna and the control module respectively.

4. The wireless charging circuit of claim 3, wherein, The communication module further comprises an MPP authentication unit, and the MPP authentication unit is connected with the control module.

5. The wireless charging circuit of claim 1, wherein, The first wireless charging module comprises a first voltage-lifting and -lowering unit, a first full-bridge inverter unit and a first coil. The first voltage-lifting and -lowering unit is connected with the first full-bridge inverter unit, the control module and the power supply module respectively, and the first full-bridge inverter unit is connected with the first coil and the control module respectively. The first voltage-lifting and -lowering unit is used for receiving the direct current of the power supply module and performing voltage lifting or voltage lowering on the direct current under the control of the control module. The first full-bridge inverter unit is used for performing inverter processing on the direct current output by the first voltage-lifting and -lowering unit under the control of the control module, so as to output the first alternating current. The first coil is used for generating a first alternating magnetic field based on the first alternating current, so that a receiving coil of the first type of device generates a first induced current when being in the first alternating magnetic field, thereby charging the first type of device.

6. The wireless charging circuit of claim 1, wherein, The second wireless charging module comprises a second voltage-lifting and -lowering unit, a second full-bridge inverter unit and a second coil. The second voltage-lifting and -lowering unit is connected with the second full-bridge inverter unit, the control module and the power supply module respectively, and the second full-bridge inverter unit is connected with the second coil and the control module respectively. The second voltage-lifting and -lowering unit is used for receiving the direct current of the power supply module and performing voltage lifting or voltage lowering on the direct current under the control of the control module. The second full-bridge inverter unit is used for performing inverter processing on the direct current output by the second voltage-lifting and -lowering unit under the control of the control module, so as to output the second alternating current. The second coil is configured to generate a second alternating magnetic field based on the second alternating current, so that a receiving coil of the second type of device generates a second induced current when in the second alternating magnetic field, to charge the second type of device.

7. The wireless charging circuit of any one of claims 1 to 6, wherein, The power supply module further comprises a power supply interface. The power supply interface is connected with the first wireless charging module, the second wireless charging module and the direct current power supply respectively.

8. The wireless charging circuit of claim 7, wherein, The power supply module comprises a low-dropout linear voltage regulator unit, and the low-dropout linear voltage regulator unit is connected with the control module. The low-dropout linear voltage regulator unit is configured to supply power to the control module.

9. The wireless charging circuit of claim 8, wherein, The power supply module further comprises a step-down unit. The step-down unit is connected with the power supply interface, the communication module, the first wireless charging module and the second wireless charging module respectively.

10. A wireless charging device, comprising: The wireless charging device comprises the wireless charging circuit according to any one of claims 1 to 9.

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