A wireless charging circuit and a wireless charging device

Abstract

The utility model relates to wireless charging technology field, concretely relates to a wireless charging circuit and wireless charging device. Wireless charging circuit includes main control module, first wireless charging module, second wireless charging module, first charging detection module, second charging detection module and charging instruction module, and first charging detection module is used for detecting the first charging parameter of first wireless charging module and will be transmitted to main control module, and second charging detection module is used for detecting the second charging parameter of second wireless charging module and will be transmitted to main control module, and main control module is used for comparing first charging parameter and second charging parameter with corresponding preset value, and according to the comparison result control charging instruction module start working or stop working. The application can reduce circuit design cost and material cost.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and in particular to a wireless charging circuit and a wireless charging device. Background Technology

[0002] A wireless charging circuit with multiple wireless output ports can charge multiple electronic devices.

[0003] In wireless charging circuits with dual wireless charging channels, the traditional approach is to design a separate charging indicator circuit for each channel to indicate whether charging is in progress. This increases the number of circuit components, raising circuit design and material costs. Furthermore, when the chip's transmission ports are limited, additional chips are needed to control the charging indication, further increasing circuit material costs. Utility Model Content

[0004] This utility model provides a wireless charging circuit and a wireless charging device to solve the problem of high circuit design and material costs in the prior art for implementing charging indication schemes in wireless charging circuits.

[0005] This utility model discloses a wireless charging circuit, including a main control module, a first wireless charging module, a second wireless charging module, a first charging detection module, a second charging detection module, and a charging indicator module. The first charging detection module is used to detect a first charging parameter of the first wireless charging module and transmit it to the main control module. The second charging detection module is used to detect a second charging parameter of the second wireless charging module and transmit it to the main control module. The main control module is used to compare the first charging parameter and the second charging parameter with corresponding preset values, and control the charging indicator module to start or stop working according to the comparison result.

[0006] Optionally, the first charging parameter includes a first voltage signal. The first wireless charging module includes a first charging coil and a wireless charging control chip connected to the first charging coil. The wireless charging control chip is provided with a first voltage pin. The main control module includes a main control chip. The first charging detection module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode. The first capacitor, the first resistor, and the second resistor are connected in series. The other end of the first capacitor is connected to the first voltage pin and one end of the second capacitor. One end of the third capacitor is connected to the series connection point of the first capacitor and the first resistor. One end of the fourth capacitor is connected to the series connection point of the first resistor and the second resistor. The other ends of the second capacitor, the third capacitor, and the fourth capacitor are all grounded. The fifth capacitor is connected in parallel with the fourth resistor and then in series with the third resistor. The other end of the third resistor is connected to the series connection point of the first resistor and the second resistor. The series connection point of the third resistor and the fourth resistor is connected to the main control chip to transmit the first voltage signal. The negative terminal of the first diode is connected to the other end of the second resistor, and the positive terminal is connected to the first charging coil.

[0007] Optionally, the first wireless charging module includes a first current detection unit and a first charging coil. The first current detection unit is used to detect the first charging current of the first charging coil and transmit it to the main control module. The main control module is also used to compare the first charging current with a corresponding preset value and control the charging indicator module to work according to the comparison result.

[0008] Optionally, the first wireless charging module includes a wireless charging control chip with a first current pin. The wireless charging control chip has the first current detection unit built in, and the first current pin is connected to the first current detection unit and the main control module to transmit the first charging current to the main control module.

[0009] Optionally, the wireless charging circuit further includes a first filtering module, which is connected to the first current pin.

[0010] Optionally, the second charging parameter includes a second voltage signal, the second wireless charging module includes a second charging coil, the main control module includes a main control chip, the main control chip is connected to the first charging detection module to receive the first charging parameter, the main control chip is provided with a second voltage pin, the second charging detection module includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, and a second diode, the sixth capacitor, the fifth resistor, and the sixth resistor are connected in series, the other end of the sixth capacitor is connected to one end of the seventh capacitor and the second voltage pin to transmit the second voltage signal to the main control chip, one end of the eighth capacitor is connected to the series node of the sixth capacitor and the fifth resistor, the ninth capacitor and the seventh resistor are connected in parallel and one end is connected to the series node of the fifth resistor and the sixth resistor, the other end of the seventh capacitor, the eighth capacitor, the ninth capacitor, and the seventh resistor are grounded, the negative terminal of the second diode is connected to the other end of the sixth resistor, and the positive terminal is connected to the second charging coil.

[0011] Optionally, the main control chip has a built-in second current detection unit, which is used to detect the second charging current of the second charging coil. The main control chip is also used to compare the second charging current with a corresponding preset value and control the charging indicator module to work according to the comparison result.

[0012] Optionally, the main control chip is provided with a second current pin connected to the second current detection unit, and the wireless charging circuit further includes a second filtering module, which is connected to the second current pin.

[0013] Optionally, the charging indicator module includes an indicator light, the positive terminal of which is connected to an external power source, and the negative terminal of which is connected to the main control module.

[0014] This utility model also discloses a wireless charging device, including the wireless charging circuit as described in any of the above claims.

[0015] Compared with the prior art, the beneficial effects of the wireless charging circuit and wireless charging device provided by this utility model embodiment are as follows: by setting up a main control module, a first wireless charging module, a second wireless charging module, a first charging detection module, a second charging detection module, and a charging indicator module, the first charging detection module is used to detect the first charging parameter of the first wireless charging module, the second charging detection module is used to detect the second charging parameter of the second wireless charging module, the main control module compares the first charging parameter and the second charging parameter with the corresponding preset value, and controls the charging indicator module to work according to the comparison result. That is, the charging indication of the first wireless charging module and the second wireless charging module are both indicated by the charging indicator module, without setting up two charging indicator modules. Moreover, the limited ports of the main control module can be used to control the charging indication of the first wireless charging module and the second wireless charging module, reducing circuit design cost and material cost. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a structural block diagram of the wireless charging circuit provided in this embodiment of the utility model;

[0018] Figure 2 This is a partial circuit diagram showing the connection between the first wireless charging module and the first charging detection module provided in this embodiment of the utility model.

[0019] Figure 3 This is a partial circuit schematic diagram of the main control module provided in this embodiment of the utility model;

[0020] Figure 4 This is a partial circuit diagram showing the connection between the second wireless charging module and the second charging detection module provided in this embodiment of the utility model.

[0021] The labels for the attached figures are as follows:

[0022] 110. Main control module; 120. First wireless charging module; 121. First charging coil; 122. First current detection unit; 130. Second wireless charging module; 131. Second charging coil; 140. First charging detection module; 150. Second charging detection module; 160. Charging indicator module; 170. First filtering module; 180. Second filtering module;

[0023] U1, Main control chip; U2, Wireless charging control chip; C1, First capacitor; C2, Second capacitor; C3, Third capacitor; C4, Fourth capacitor; C5, Fifth capacitor; C6, Sixth capacitor; C7, Seventh capacitor; C8, Eighth capacitor; C9, Ninth capacitor; C10, First filter capacitor; C11, Second filter capacitor; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; R5, Fifth resistor; R6, Sixth resistor; R7, Seventh resistor; R8, First filter resistor; R9, Second filter resistor; D1, First diode; D2, Second diode; LED1, Indicator light. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] This utility model embodiment provides a wireless charging circuit, such as Figures 1 to 4 As shown, the wireless charging circuit includes a main control module 110, a first wireless charging module 120, a second wireless charging module 130, a first charging detection module 140, a second charging detection module 150, and a charging indicator module 160. The first charging detection module 140 is used to detect the first charging parameter of the first wireless charging module 120 and transmit it to the main control module 110. The second charging detection module 150 is used to detect the second charging parameter of the second wireless charging module 130 and transmit it to the main control module 110. The main control module 110 is used to compare the first charging parameter and the second charging parameter with the corresponding preset value, and control the charging indicator module 160 to start or stop working according to the comparison result.

[0026] The wireless charging circuit of this embodiment comprises a main control module 110, a first wireless charging module 120, a second wireless charging module 130, a first charging detection module 140, a second charging detection module 150, and a charging indicator module 160. The first charging detection module 140 detects the first charging parameter of the first wireless charging module 120, and the second charging detection module 150 detects the second charging parameter of the second wireless charging module 130. The main control module 110 compares the first and second charging parameters with corresponding preset values ​​and controls the charging indicator module 160 to work based on the comparison result. That is, the charging indicators of the first wireless charging module 120 and the second wireless charging module 130 are both indicated by the charging indicator module 160, without setting up two separate charging indicator modules 160. Furthermore, the limited ports of the main control module 110 can be used to control the charging indicators of the first wireless charging module 120 and the second wireless charging module 130, thereby reducing chip costs and application selection, material management costs, circuit design costs, and material costs.

[0027] Specifically, when the first charging parameter of the first wireless charging module 120 is greater than or equal to the corresponding preset value, it indicates that the first wireless charging module 120 has started charging, and the main control module 110 controls the charging indicator module 160 to start working and provide charging indication. When the first charging parameter of the first wireless charging module 120 is less than the corresponding preset value, it indicates that the first wireless charging module 120 has not started charging, and the main control module 110 controls the charging indicator module 160 to stop working. When the second charging parameter of the second wireless charging module 130 is greater than or equal to the corresponding preset value, it indicates that the second wireless charging module 130 has started charging, and the main control module 110 controls the charging indicator module 160 to start working and provide charging indication. When the second charging parameter of the second wireless charging module 130 is less than the corresponding preset value, it indicates that the second wireless charging module 130 has not started charging, and the main control module 110 controls the charging indicator module 160 to stop working. The main control module 110 can use existing chips to compare the first charging parameter and the second charging parameter with the corresponding preset values, such as the chip NU17122, which has multiple built-in comparators that output high or low levels to drive the charging indicator module 160 to work or stop working.

[0028] refer to Figure 2 and Figure 3 In an optional embodiment of this application, the main control module 110 includes a main control chip U1, the first charging parameter includes a first voltage signal, the first wireless charging module 120 includes a first charging coil 121 and a wireless charging control chip U2 connected to the first charging coil 121, the wireless charging control chip U2 is provided with a first voltage pin, and the first charging detection module 140 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first diode D1. The first capacitor C1, the first resistor R1, and the second resistor R2 are connected in series, and the other end of the first capacitor C1 is connected to the first voltage signal. One end of the second capacitor C2 and one end of the third capacitor C3 are connected to the series node of the first capacitor C1 and the first resistor R1. One end of the fourth capacitor C4 is connected to the series node of the first resistor R1 and the second resistor R2. The other ends of the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all grounded. The fifth capacitor C5 is connected in parallel with the fourth resistor R4 and then in series with the third resistor R3. The other end of the third resistor R3 is connected to the series node of the first resistor R1 and the second resistor R2. The series node of the third resistor R3 and the fourth resistor R4 is connected to the main control chip U1 to transmit the first voltage signal. The negative terminal of the first diode D1 is connected to the other end of the second resistor R2, and the positive terminal is connected to the first charging coil 121.

[0029] By setting up an RC filter circuit consisting of a first diode D1 and multiple resistors and capacitors, the first voltage signal generated by the first charging coil 121 can be detected and transmitted to the main control chip U1. The main control chip U1 compares the first voltage signal with a corresponding preset value. If the first charging coil 121 is activated to charge an external charging receiving coil, the generated first voltage signal is greater than or equal to the corresponding preset value, and the main control chip U1 controls the charging indicator module 160 to be activated.

[0030] In other embodiments, the main control chip U1 can also compare the resonant waveform frequency generated by the first charging coil with the corresponding preset value, and control the charging indicator module 160 to start or stop working based on the comparison result.

[0031] In an optional embodiment of this application, reference is made to Figure 2 and Figure 3 The first wireless charging module 120 includes a first current detection unit 122 and a first charging coil 121. The first current detection unit 122 is used to detect the first charging current of the first charging coil 121 and transmit it to the main control module 110. The main control module 110 is also used to compare the first charging current with the corresponding preset value and control the charging indicator module 160 to work according to the comparison result.

[0032] By setting a first current detection unit 122, the charging current of the first charging coil 121 can be detected in real time and transmitted to the main control module 110. When the first wireless charging module 120 is turned on to charge the external receiving coil, if the first charging current detected by the first current detection unit 122 is greater than or equal to the corresponding preset value, the main control module 110 controls the charging indicator module 160 to turn on, thus indicating the charging status of the first wireless charging module 120. When the charging current detected by the first current detection unit 122 is less than the corresponding preset value, the main control module 110 controls the charging indicator module 160 to stop working. Combining the first charging parameters and the first charging current allows for a more accurate determination of whether charging has started, providing users with a more accurate and reliable charging indication.

[0033] Optionally, the first wireless charging module 120 includes a wireless charging control chip U2 with a first current pin. The wireless charging control chip U2 has a built-in first current detection unit 122. The first current pin is connected to the first current detection unit 122 and the main control module 110 to transmit the first charging current to the main control module 110.

[0034] By using the first current detection unit 122 built into the wireless charging control chip U2 to detect the charging current of the first charging coil 121, it is possible to avoid using additional external current detection circuit components in the circuit, thereby reducing the number of components. This not only simplifies the circuit design but also reduces the complexity and assembly cost of the circuit, which is beneficial to the miniaturization of wireless charging circuits and wireless charging devices.

[0035] In practice, the wireless charging control chip U2 can be a chip such as NU10300, which has a built-in current sampling circuit that can collect the charging current of the first charging coil 121.

[0036] Further, refer to Figure 1 and Figure 2 The wireless charging circuit also includes a first filter module 170, which is connected to the first current pin.

[0037] During wireless charging, the current signal may be affected by electromagnetic interference (EMI), power supply noise, or other external interference. By setting up a first filter module 170, the first filter module 170 can effectively filter out these high-frequency noise and interference signals, ensuring that the current signal transmitted to the main control module 110 is purer and more stable. In addition, the first filter module 170 can smooth the current signal, reducing spikes and fluctuations in the signal.

[0038] Optionally, the first filtering module 170 includes a first filtering resistor R8 and a first filtering capacitor C10, which are connected in parallel. The first parallel node is connected to the first current pin, and the second parallel node is grounded. Using the first filtering resistor R8 and the first filtering capacitor C10 in parallel for filtering can effectively filter out high-frequency noise and interference, and the circuit structure is simple, which helps to realize the miniaturization of wireless charging circuits.

[0039] In an optional embodiment of this application, reference is made to Figure 1 , Figure 3 and Figure 4The second charging parameter includes a second voltage signal. The second wireless charging module 130 includes a second charging coil 131. The main control module 110 includes a main control chip U1, which is connected to the first charging detection module 140 to receive the first charging parameter. The main control chip U1 is provided with a second voltage pin. The second charging detection module 150 includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a second diode D2. The sixth capacitor C6, the fifth resistor R5, and the sixth resistor R6... The capacitors are connected in series. The other end of the sixth capacitor C6 is connected to one end of the seventh capacitor C7 and the second voltage pin to transmit the second voltage signal to the main control chip U1. One end of the eighth capacitor C8 is connected to the series node of the sixth capacitor C6 and the fifth resistor R5. The ninth capacitor C9 is connected in parallel with the seventh resistor R7, and one end is connected to the series node of the fifth resistor R5 and the sixth resistor R6. The other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9 and the seventh resistor R7 are grounded. The cathode of the second diode D2 is connected to the other end of the sixth resistor R6, and the anode is connected to the second charging coil 131.

[0040] By setting up an RC filter circuit consisting of a second diode D2 and multiple resistors and capacitors, the second voltage signal generated by the second charging coil 131 can be detected and transmitted to the main control chip U1. The main control chip U1 compares the second voltage signal with a corresponding preset value. If the second charging coil 131 is activated to charge an external charging receiving coil, the generated second voltage signal is greater than or equal to the corresponding preset value, and the main control chip U1 controls the charging indicator module 160 to be activated.

[0041] Optionally, the main control chip U1 has a built-in second current detection unit. The second current detection unit is used to detect the second charging current of the second charging coil 131. The main control chip U1 is also used to compare the second charging current with the corresponding preset value and control the charging indicator module 160 to work according to the comparison result.

[0042] By setting a second current detection unit, the charging current of the second charging coil 131 can be detected in real time and transmitted to the main control chip U1. When the first wireless charging module 120 is turned on to charge the external receiving coil, if the second charging current detected by the second current detection unit is greater than or equal to the corresponding preset value, the main control chip U1 controls the charging indicator module 160 to turn on, thus indicating the charging status of the second wireless charging module 130. When the charging current detected by the second current detection unit is less than the corresponding preset value, the main control chip U1 controls the charging indicator module 160 to stop working. Combining the first charging parameters and the first charging current allows for a more accurate determination of whether charging has started, providing users with a more accurate and reliable charging indication.

[0043] Further, refer to Figure 4 The main control chip U1 is provided with a second current pin connected to the second current detection unit. The wireless charging circuit also includes a second filter module 180, which is connected to the second current pin.

[0044] During wireless charging, the current signal may be affected by electromagnetic interference (EMI), power supply noise, or other external interference. By setting up a second filter module 180, these high-frequency noise and interference signals can be effectively filtered out, ensuring that the current signal transmitted to the main control module 110 is purer and more stable. The second filter module 180 can also smooth the current signal, reducing spikes and fluctuations in the signal.

[0045] Optional, continue to refer to Figure 4 The second filtering module 180 includes a second filtering resistor R9 and a second filtering capacitor C11, which are connected in parallel. The first parallel node is connected to the second current pin, and the second parallel node is grounded. Using the second filtering resistor R9 and the second filtering capacitor C11 in parallel for filtering can effectively filter out high-frequency noise and interference, and the circuit structure is simple, which helps to achieve miniaturization of the wireless charging circuit.

[0046] refer to Figure 4 In an optional embodiment of this application, the charging indicator module 160 includes an indicator LED1, the positive terminal of which is connected to an external power supply and the negative terminal is connected to the main control module 110.

[0047] Specifically, when the main control module 110 outputs a high level, indicator LED1 stops working; when the main control module 110 outputs a low level, indicator LED1 turns on. Indicator LED1 is a very intuitive visual feedback method. Users can quickly understand the charging status of the device by observing the on / off state of indicator LED1. For example, indicator LED1 being on indicates that the first wireless charging module 120 and / or the second wireless charging module 130 are charging, and indicator LED1 being off indicates that neither the first wireless charging module 120 nor the second wireless charging module 130 are charging.

[0048] This utility model embodiment also provides a wireless charging device, which includes the wireless charging circuit as described above.

[0049] In this embodiment, the wireless charging circuit of the wireless charging device comprises a main control module 110, a first wireless charging module 120, a second wireless charging module 130, a first charging detection module 140, a second charging detection module 150, and a charging indicator module 160. The first charging detection module 140 detects the first charging parameter of the first wireless charging module 120, and the second charging detection module 150 detects the second charging parameter of the second wireless charging module 130. The main control module 110 compares the first and second charging parameters with corresponding preset values ​​and controls the charging indicator module 160 to work based on the comparison result. That is, the charging indicators of the first and second wireless charging modules 120 and 130 are both indicated by the charging indicator module 160, without setting up two separate charging indicator modules 160. Furthermore, the limited ports of the main control module 110 can be used to control the charging indicators of the first and second wireless charging modules 120 and 130, reducing chip costs and application selection, material management costs, circuit design costs, and material costs.

[0050] This wireless charging device includes the same circuit structure and beneficial effects as the wireless charging circuit in the foregoing embodiments. The circuit structure and beneficial effects of the wireless charging circuit have been described in detail in the foregoing embodiments and will not be repeated here.

[0051] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A wireless charging circuit, characterized in that, The device includes a main control module, a first wireless charging module, a second wireless charging module, a first charging detection module, a second charging detection module, and a charging indicator module. The first charging detection module detects a first charging parameter of the first wireless charging module and transmits it to the main control module. The second charging detection module detects a second charging parameter of the second wireless charging module and transmits it to the main control module. The main control module compares the first charging parameter and the second charging parameter with corresponding preset values ​​and controls the charging indicator module to start or stop working based on the comparison result.

2. The wireless charging circuit according to claim 1, characterized in that, The first charging parameter includes a first voltage signal. The first wireless charging module includes a first charging coil and a wireless charging control chip connected to the first charging coil. The wireless charging control chip is provided with a first voltage pin. The main control module includes a main control chip. The first charging detection module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode. The first capacitor, the first resistor, and the second resistor are connected in series. The other end of the first capacitor is connected to the first voltage pin and one end of the second capacitor. One end of the third capacitor is connected to the series connection point of the first capacitor and the first resistor. One end of the fourth capacitor is connected to the series connection point of the first resistor and the second resistor. The other ends of the second capacitor, the third capacitor, and the fourth capacitor are all grounded. The fifth capacitor is connected in parallel with the fourth resistor and then in series with the third resistor. The other end of the third resistor is connected to the series connection point of the first resistor and the second resistor. The series connection point of the third resistor and the fourth resistor is connected to the main control chip to transmit the first voltage signal. The negative terminal of the first diode is connected to the other end of the second resistor, and the positive terminal is connected to the first charging coil.

3. The wireless charging circuit according to claim 1, characterized in that, The first wireless charging module includes a first current detection unit and a first charging coil. The first current detection unit is used to detect the first charging current of the first charging coil and transmit it to the main control module. The main control module is also used to compare the first charging current with a corresponding preset value and control the charging indicator module to work according to the comparison result.

4. The wireless charging circuit according to claim 3, characterized in that, The first wireless charging module includes a wireless charging control chip with a first current pin. The wireless charging control chip has the first current detection unit built in, and the first current pin is connected to the first current detection unit and the main control module to transmit the first charging current to the main control module.

5. The wireless charging circuit according to claim 4, characterized in that, The wireless charging circuit also includes a first filtering module, which is connected to the first current pin.

6. The wireless charging circuit according to claim 1, characterized in that, The second charging parameter includes a second voltage signal. The second wireless charging module includes a second charging coil. The main control module includes a main control chip. The main control chip is connected to the first charging detection module to receive the first charging parameter. The main control chip is provided with a second voltage pin. The second charging detection module includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, and a second diode. The sixth capacitor, the fifth resistor, and the sixth resistor are connected in series. The other end of the sixth capacitor is connected to one end of the seventh capacitor and the second voltage pin to transmit the second voltage signal to the main control chip. One end of the eighth capacitor is connected to the series connection node of the sixth capacitor and the fifth resistor. The ninth capacitor is connected in parallel with the seventh resistor, and one end is connected to the series connection node of the fifth resistor and the sixth resistor. The other ends of the seventh capacitor, the eighth capacitor, the ninth capacitor, and the seventh resistor are grounded. The negative terminal of the second diode is connected to the other end of the sixth resistor, and the positive terminal is connected to the second charging coil.

7. The wireless charging circuit according to claim 6, characterized in that, The main control chip has a built-in second current detection unit, which is used to detect the second charging current of the second charging coil. The main control chip is also used to compare the second charging current with a corresponding preset value and control the charging indicator module to work according to the comparison result.

8. The wireless charging circuit according to claim 7, characterized in that, The main control chip is provided with a second current pin connected to the second current detection unit, and the wireless charging circuit further includes a second filtering module, which is connected to the second current pin.

9. The wireless charging circuit according to any one of claims 1-8, characterized in that, The charging indicator module includes an indicator light, the positive terminal of which is connected to an external power source, and the negative terminal of which is connected to the main control module.

10. A wireless charging device, characterized in that, Includes the wireless charging circuit as described in any one of claims 1-9.

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