A power supply circuit and an electronic device

Abstract

The application discloses a power supply circuit and electronic equipment, the power supply circuit includes power conversion module, power detection module, detection control module and power control module, the power conversion module is used for powering the load according to the input voltage, the power detection module is used for detecting the output power of the power conversion module, and the corresponding detection signal is output according to the output power; the detection control module is used for controlling the detection sampling ratio of the power detection module; the power control module is used for adjusting the working state of the power conversion module according to the detection signal, so as to adapt to the load power supply; the application can adjust the power switching point of heavy load state and light load state identification, so as to alleviate the situation that the output power of the load is too small in the light load state, the voltage value of the detection signal output by the power detection module is affected, and the load state misjudgment occurs, and then the reliability of the power supply circuit is improved.

Description

Technical Field

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

[0002] With the advancement of power supply technology, current-mode LLC resonant power supplies have been widely used. To improve power conversion efficiency, different operating modes are set for different power ranges, such as micro-load (standby), light load, and heavy load operating modes, and mode switching is achieved through load detection.

[0003] However, the switching threshold between light load and heavy load is usually set at around 20% of the full load power. If the power switching point is further reduced to 10% of the full load power, the resonant current will be too small, the controller will not be able to identify the load status, and misjudgment will easily occur, such as mistaking light load for no load, thus affecting the reliability of the power supply.

[0004] Therefore, existing technologies still need to be improved and enhanced. Utility Model Content

[0005] The purpose of this application is to provide a power supply circuit and an electronic device, which can alleviate the problem of power supply reliability being affected by misjudgment under light load conditions.

[0006] To achieve the above objectives, this application adopts the following technical solution: This application provides a power supply circuit, which includes: A power conversion module is used to supply power to the load according to the input voltage. The power detection module is connected to the power conversion module. The power detection module is used to detect the output power of the power conversion module and output a corresponding detection signal according to the output power. The detection control module is used to control the detection sampling ratio of the power supply detection module. The power control module is connected to both the power conversion module and the power detection module. The power control module is used to adjust the operating state of the power conversion module according to the detection signal to supply power to the appropriate load.

[0007] In some embodiments of the power supply circuit, the detection control module includes a control unit and an adjustment unit, wherein the control unit is connected to the adjustment unit and the adjustment unit is connected to the power detection module. The control unit is used to disconnect the adjustment unit from the power detection module when the output power is less than the preset power, so as to increase the detection sampling ratio of the power detection module; the power control module is used to control the power conversion module to the first working state when the voltage value corresponding to the detection signal is less than the preset voltage. The control unit is used to control the adjustment unit to connect with the power detection module to reduce the detection sampling ratio of the power detection module when the output power is greater than or equal to the preset power; the power control module is also used to control the power conversion module to the second working state when the voltage value corresponding to the detection signal is greater than the preset voltage.

[0008] In some embodiments of the power supply circuit, the regulating unit includes a first capacitor, one end of which is connected to the power detection module, and the other end of which is connected to the control unit.

[0009] In some embodiments of the power supply circuit, the control unit includes two diodes, with pin 1 of the two diodes connected to and pin 2 grounded, and pin 3 of the two diodes connected to the regulating unit.

[0010] In some embodiments of the power supply circuit, the power conversion module includes a transformer and a resonant capacitor, one end of the resonant capacitor is connected to the transformer, and the other end of the resonant capacitor is grounded; the control unit includes a control subunit and a detection subunit, the control subunit is connected to the detection subunit and the adjustment unit, and the detection subunit is also connected to one end of the resonant capacitor; The detection subunit is used to detect the voltage of the resonant capacitor to output a first sample voltage; the control subunit is used to control the adjustment unit to disconnect from the power supply detection module when the first sample voltage is less than the reference voltage; the control subunit is used to control the adjustment unit to connect to the power supply detection module when the first sample voltage is greater than the reference voltage.

[0011] In some embodiments of the power supply circuit, the power conversion module includes a transformer and a resonant capacitor, one end of the resonant capacitor is connected to the transformer, and the other end of the resonant capacitor is grounded; the control unit includes a control subunit and a detection subunit, the control subunit is connected to the detection subunit and the adjustment unit, and the detection subunit is also connected to one end of the resonant capacitor; The detection subunit is used to detect the current of the resonant capacitor to output a second sampling voltage; the control subunit is used to control the adjustment unit to disconnect from the power supply detection module when the second sampling voltage is less than the reference voltage; the control subunit is used to control the adjustment unit to connect to the power supply detection module when the second sampling voltage is greater than the reference voltage.

[0012] In some embodiments of the power supply circuit, the detection subunit includes a second capacitor and a third capacitor. One end of the second capacitor is connected to one end of the resonant capacitor, and the other end of the second capacitor is connected to one end of the third capacitor. One end of the third capacitor is also connected to the control subunit, and the other end of the third capacitor is grounded.

[0013] In some embodiments of the power supply circuit, the detection subunit includes a fourth capacitor and a sampling resistor. One end of the fourth capacitor is connected to one end of the resonant capacitor, and the other end of the fourth capacitor is connected to one end of the sampling resistor. One end of the sampling resistor is also connected to the control subunit, and the other end of the sampling resistor is grounded.

[0014] In some embodiments of the power supply circuit, the control subunit includes a controller and a switch. The controller is connected to a first terminal of the switch and a detection subunit, respectively. The second terminal of the switch is connected to an adjustment unit, and the third terminal of the switch is grounded.

[0015] In some embodiments of the power supply circuit, the power detection module includes a fifth capacitor and a sixth capacitor. One end of the fifth capacitor is connected to the power conversion module, the other end of the fifth capacitor is connected to one end of the sixth capacitor and the power detection module, one end of the sixth capacitor is connected to the power control module, and the other end of the sixth capacitor is grounded.

[0016] This application also provides an electronic device, which includes the power supply circuit described above.

[0017] This application provides a power supply circuit and an electronic device. The power supply circuit uses a power control module to identify whether the load is under heavy load or light load based on the detection signal output by the power detection module. The detection control module controls the detection sampling ratio of the power detection module and the magnitude of the voltage value corresponding to the detection signal, thereby adjusting the power switching point for heavy load and light load identification. This avoids the situation where the output power of the load is too small under light load conditions, which would affect the voltage value of the detection signal output by the power detection module and lead to misjudgment of the load state, thus improving the reliability of the power supply circuit. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of the power supply circuit provided in an embodiment of this application.

[0019] Figure 2 This is a structural block diagram of the detection and control module in the power supply circuit provided in an embodiment of this application.

[0020] Figure 3 This is a structural block diagram of the control unit in the power supply circuit provided in an embodiment of this application.

[0021] Figure 4 This is a first circuit diagram of a power supply circuit provided in an embodiment of this application.

[0022] Figure 5 This is a second circuit diagram of a power supply circuit provided in an embodiment of this application.

[0023] Figure 6 This is a third circuit diagram of the power supply circuit provided in the embodiments of this application.

[0024] Figure 7 The voltage waveforms of the resonant capacitor and the sixth capacitor in the power supply circuit provided in this application embodiment are shown when the adjustment unit is not connected to the circuit.

[0025] Figure 8 The voltage waveforms of the resonant capacitor and the sixth capacitor in the power supply circuit provided in this application embodiment when the adjustment unit is connected to the circuit. Detailed Implementation

[0026] The purpose of this application is to provide a power supply circuit, an antenna device, and an electronic device. This power supply circuit can alleviate the problem that current antenna designs cannot achieve the expected receiving gain, and is beneficial to improving the overall performance of the antenna system.

[0027] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0028] Please see Figure 1 This application provides a power supply circuit, which includes a power conversion module 100, a power detection module 200, a detection control module 300, and a power control module 400. The power conversion module 100 is used to connect to the input voltage and the load 10. The power detection module 200 is connected to the power conversion module 100, the detection control module 300, and the power control module 400.

[0029] The power conversion module 100 is used to supply power to the load 10 according to the input voltage; the power detection module 200 is used to detect the output power of the power conversion module 100 and output a corresponding detection signal according to the output power; the detection control module 300 is used to control the detection sampling ratio of the power detection module 200; and the power control module 400 is used to adjust the working state of the power conversion module 100 according to the detection signal to adapt to the power supply of the load 10.

[0030] In this embodiment, the power control module 400 determines whether the current load 10 is in a light load or heavy load state based on the detection signal output by the power detection module 200. If the current load 10 is in a light load state, the power control module 400 can control the power conversion module 100 to enter a first working state to adapt to the power demand of the load 10 in a light load state; if the current load 10 is in a heavy load state, the power control module 400 can control the power conversion module 100 to enter a second working state to adapt to the power demand of the load 10 in a heavy load state. The power control module 400 identifies whether the load 10 is under heavy load or light load based on the detection signal output by the power detection module 200. The detection control module 300 controls the detection sampling ratio of the power detection module 200, which can relatively adjust the voltage value corresponding to the detection signal input to the power control module 400. This adjusts the power switching point for heavy load and light load identification, thereby avoiding the situation where the output power of the load 10 is too small under light load conditions, which would affect the voltage value of the detection signal output by the power detection module 200 and lead to misjudgment of the load 10's state. This, in turn, helps to improve the reliability of the power circuit.

[0031] Please see Figure 2 In some embodiments, the detection control module 300 includes a control unit 310 and an adjustment unit 320, wherein the control unit 310 is connected to the adjustment unit 320 and the adjustment unit 320 is connected to the power detection module 200.

[0032] The control unit 310 is used to disconnect the adjustment unit 320 from the power detection module 200 when the output power is less than the preset power, thereby increasing the detection sampling ratio of the power detection module 200 and thus relatively increasing the voltage value corresponding to the detection signal. Therefore, even when the output power of the power conversion module 100 is low, the power detection module 200 can still output a detection signal, and the power control module 400 can also acquire the voltage value corresponding to the detection signal. The power control module 400 is used to control the power conversion module 100 to its first operating state when the voltage value corresponding to the detection signal is less than the preset voltage, which is equivalent to determining that the current load 10 is in a light load state, so as to adapt to the power supply requirements of the load 10.

[0033] In this embodiment, the control unit 310 is further configured to control the adjustment unit 320 to connect with the power detection module 200 when the output power is greater than or equal to a preset power, thereby reducing the detection sampling ratio of the power detection module 200 and thus relatively reducing the voltage value corresponding to the detection signal. The power control module 400 is further configured to control the power conversion module 100 to a second operating state when the voltage value corresponding to the detection signal is greater than a preset voltage, in order to adapt to the power supply requirements of the load 10. Thus, when the output power of the power conversion module 100 is large, the detection control module 300 reduces the detection sampling ratio of the power detection module 200 to reduce the voltage value of the detection signal, thereby mitigating the situation where the voltage value acquired by the power control module 400 is too large and damaged or an overload misjudgment occurs.

[0034] In some embodiments, the power conversion module 100 includes a transformer T1, a resonant capacitor C0, a first MOSFET Q1, a second MOSFET Q2, and a resonant inductor L1. The first MOSFET Q1 and the second MOSFET Q2 form an LLC half-bridge unit, which is alternately turned on according to the control signal input by the power control module 400. The resonant inductor L1 and the resonant capacitor C0 are located at the primary end of the transformer T1. One end of the resonant capacitor C0 is connected to the transformer T1, and the other end is grounded. The secondary end of the transformer T1 can be connected to the load 10 through a rectifier module 500, which rectifies the power output from the transformer T1 to supply power to the load 10. In this embodiment, controlling the power conversion module 100 to enter a first operating state can be controlling the power conversion module 100 to enter a skip-cycle operating mode, corresponding to a light-load mode; controlling the power conversion module 100 to enter a second operating state can be controlling the power conversion module 100 to enter a fixed-frequency operating mode, corresponding to a heavy-load mode. It should be noted that the structure and operation of the power conversion module 100 in this embodiment are known, and the specific structure and operation of the power conversion module 100 will not be described in detail.

[0035] Please see Figure 3 In some embodiments, the control unit 310 includes a control subunit 311 and a detection subunit 312. The control subunit 311 is connected to the detection subunit 312 and the adjustment unit 320. The detection subunit 312 is also connected to one end of the resonant capacitor C0. The detection subunit 312 is used to detect the voltage of the resonant capacitor C0 to output a first sampling voltage. The control subunit 311 is used to control the adjustment unit 320 to disconnect from the power detection module 200 when the first sampling voltage is less than the reference voltage; the control subunit 311 is used to control the adjustment unit 320 to connect to the power detection module 200 when the first sampling voltage is greater than the reference voltage.

[0036] When load 10 is under heavy load, the output power of power conversion module 100 is higher; when load 10 is under light load, the output power of power conversion module 100 is lower. Correspondingly, the voltage amplitude of resonant capacitor C0 is larger under heavy load and smaller under light load. Therefore, the voltage of resonant capacitor C0 can characterize the output power of power conversion module 100, and the state of load 10 can be determined by detecting the voltage of resonant capacitor C0. Then, control subunit 311 determines the current state of load 10 based on the first sampled voltage output by detection subunit 312, so as to control the connection state between adjustment unit 320 and power detection module 200, and thereby adjust the detection sampling ratio of power detection module 200.

[0037] Under heavy load conditions, the current of resonant capacitor C0 is relatively large; under light load conditions, the current of resonant capacitor C0 is relatively small. Similarly, the state of load 10 can be preliminarily determined by detecting the current of resonant capacitor C0. Correspondingly, detection subunit 312 is used to detect the current of resonant capacitor C0 to output a second sampling voltage; control subunit 311 is used to control the adjustment unit 320 to disconnect from the power detection module 200 when the second sampling voltage is less than the reference voltage; control subunit 311 is used to control the adjustment unit 320 to connect to the power detection module 200 when the second sampling voltage is greater than the reference voltage. Thus, control subunit 311 determines the current state of load 10 based on the second sampling voltage output by detection subunit 312, so as to control the connection state between adjustment unit 320 and power detection module 200, and thereby adjust the detection sampling ratio of power detection module 200.

[0038] It should be noted that in this embodiment, the voltage value of the detection signal changes with the size of the resonant capacitor C0. The magnitude of the voltage value of the detection signal represents the size of the resonant capacitor C0. The power control module 400 identifies the load state (whether the load is light or heavy) by acquiring the voltage value of the detection signal. The detection control adjusts the detection sampling ratio of the power detection module 200 to relatively adjust the magnitude of the detection signal, thereby adjusting the power switching point for identifying heavy and light load states.

[0039] Please see Figure 4In one embodiment, when the detection subunit 312 is used to detect the voltage of the resonant capacitor C0, the detection subunit 312 includes a second capacitor C2 and a third capacitor C3. One end of the second capacitor C2 is connected to one end of the resonant capacitor C0, and the other end of the second capacitor C2 is connected to one end of the third capacitor C3. One end of the third capacitor C3 is also connected to the control subunit 311, and the other end of the third capacitor C3 is grounded. In this embodiment, the voltage amplitude of the resonant capacitor C0 is detected by setting a capacitor voltage divider, so that the control subunit 311 can control the state of the adjustment unit 320 and the power detection module 200.

[0040] Please see Figure 5 In one embodiment, when the detection subunit 312 is used to detect the current of the resonant capacitor C0, the detection subunit 312 includes a fourth capacitor C4 and a sampling resistor Rc. One end of the fourth capacitor C4 is connected to one end of the resonant capacitor C0, and the other end of the fourth capacitor C4 is connected to one end of the sampling resistor Rc. One end of the sampling resistor Rc is also connected to the control subunit 311, and the other end of the sampling resistor Rc is grounded. In this embodiment, the current sampling of the resonant capacitor C0 is achieved by setting the sampling resistor Rc, which also enables the control of the adjustment unit 320.

[0041] In one embodiment, the control subunit 311 includes a controller 3111 and a switch K1. The controller 3111 is connected to the first terminal of the switch K1 and the detection subunit 312, respectively. The second terminal of the switch K1 is connected to the adjustment unit 320, and the third terminal of the switch K1 is grounded. In this embodiment, the controller 3111 can be a comparator or logic device, etc., to compare the first or second sampled voltage output by the detection subunit 312 with a reference voltage, so as to output a first level signal, such as a high level signal, to control the switch K1 to turn on, or output a second level signal, such as a low level signal, to control the switch K1 to turn off. Of course, the controller 3111 and the switch K1 in this embodiment can also be selected from devices with the same function, and this application does not limit this.

[0042] When switch K1 is turned on, the regulating unit 320 is grounded, so that the regulating unit 320 forms a path to connect to the power detection module 200. When switch K1 is turned off, the path of the regulating unit 320 is broken, and it does not participate in the operation, that is, it is disconnected from the power detection module 200.

[0043] Please see Figure 6In another embodiment, the control unit 310 includes two diodes, with pin 1 connected to the ground and pin 2 grounded, and pin 3 connected to the adjustment unit 320. The two diodes are formed by two diodes connected in series. That is, in this embodiment, the two diodes can be directly configured to form a switch connected to the adjustment unit 320 to control the connection relationship between the adjustment unit 320 and the power detection module 200. Compared with setting the controller 3111 and the switch K1, this simplifies the circuit structure, improves the reliability of the power circuit, and helps to reduce costs.

[0044] In one embodiment, the adjustment unit 320 includes a first capacitor C1. One end of the first capacitor C1 is connected to the power detection module 200, and the other end of the first capacitor C1 is connected to the control unit 310. The power detection module 200 includes a fifth capacitor C5 and a sixth capacitor C6. One end of the fifth capacitor C5 is connected to the power conversion module 100, and the other end of the fifth capacitor C5 is connected to one end of the sixth capacitor C6 and the power detection module 200. One end of the sixth capacitor C6 is connected to the power control module 400, and the other end of the sixth capacitor C6 is grounded. When the AC voltage of the resonant capacitor C0 is divided by the fifth capacitor C5 and the sixth capacitor C6, the AC voltage is greater than the PN junction voltage of the diode. At this time, the two diodes conduct, so that the first capacitor C1 is connected to the circuit. The two diodes intercept small-amplitude AC signals. If the AC voltage of the resonant capacitor C0 is small, the two diodes do not conduct, and the first capacitor C1 is not connected to the circuit.

[0045] The AC voltage across the resonant capacitor C0 is divided by the fifth capacitor C5 and the sixth capacitor C6 before being input to the power control module 400. Because the AC voltage across the resonant capacitor C0 is relatively low under light load conditions, the power control module 400 cannot stably detect the voltage value after voltage division. Therefore, the power control module 400 generally considers the load 10 to be at 20% of the rated power, which is equivalent to 20% of the rated power, as the power switching point between light and heavy load states. At this point, the AC voltage across the resonant capacitor C0 is not too low, and the power controller 3111 can detect the voltage of the resonant capacitor C0 through the power detection module 200 to facilitate subsequent control of the operating state of the power conversion module 100. If the load 10 uses 10% of its rated power as the power switching point, the power control module 400 will consider the load 10 to be in a light load state when it detects that the output power is less than 10% (i.e., the preset power in this embodiment can be less than 10%). However, at this time, the AC voltage of the resonant capacitor C0 is small, the voltage division of the power detection module 200 is small, and the power control module 400 is not easy to detect the voltage of the resonant capacitor C0, which is prone to misjudgment.

[0046] Reducing the capacitance of the sixth capacitor C6 increases the amplitude of the AC voltage input to the power control module 400, enabling the detection of the voltage of the resonant capacitor C0 even under light load conditions. However, under heavy load conditions, the AC voltage amplitude of the resonant capacitor C0 increases, potentially causing the power control module 400 to misinterpret the voltage as overload or even exceed its withstand voltage limit, leading to damage. Therefore, in this application, when the detection control module 300 detects a light load condition, it disconnects the first capacitor C1 from the circuit, preventing it from operating. This effectively reduces the capacitance of the power detection module 200, thereby increasing the voltage division ratio and consequently increasing the voltage value of the detection signal input to the power control module 400. This allows the power control module 400 to stably detect the AC voltage of the resonant capacitor C0 even under light load conditions at lower power switching points (e.g., the power switching point is set to 10% of the rated power), thus enabling the power conversion module 100 to switch states. When the detection control module 300 detects a heavy load state, it controls the first capacitor C1 to be connected to the circuit, and connects the first capacitor C1 and the sixth capacitor C6 in parallel. This increases the capacity, reduces the detection sampling ratio of the power detection module 200, and relatively reduces the voltage value of the detection signal, thereby alleviating the problem of damage or misjudgment caused by excessive voltage input to the power control module 400.

[0047] Please refer to the following: Figure 7 and Figure 8 The capacitance of the fifth capacitor C5 is set to 100pF, the capacitance of the sixth capacitor C6 is set to 4.9nF, and the capacitance of the sixth capacitor C6 and the first capacitor C1 connected in parallel is 9.9nF. When the sixth capacitor C6 is connected alone, the voltage division ratio of the fifth capacitor C5 and the sixth capacitor C6 is 1:50; when the first capacitor C1 is connected in parallel to the circuit, the voltage division ratio of the fifth capacitor C5, the sixth capacitor C6, and the first capacitor C1 is 1:100. The voltage of the resonant capacitor C0 is positively correlated with the output power. If the power control module 400 (the SNSCAP signal terminal of U1) switches to light load mode when it detects a peak voltage value less than 0.5V, then the power switching point of setting the sixth capacitor C6 alone is lower than the power switching point of setting the sixth capacitor C6 and the first capacitor C1 simultaneously.

[0048] This application also provides an electronic device, which includes the power supply circuit described above. Since the power supply circuit has been described in detail above, it will not be repeated here.

[0049] The power supply circuits provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: A power conversion module, which supplies power to the load according to the input voltage; A power detection module is connected to the power conversion module. The power detection module is used to detect the output power of the power conversion module and output a corresponding detection signal according to the output power. A detection control module, wherein the detection control module is used to control the detection sampling ratio of the power detection module; A power control module is provided, which is connected to both the power conversion module and the power detection module. The power control module is used to adjust the operating state of the power conversion module according to the detection signal to adapt to the power supply of the load.

2. The power supply circuit according to claim 1, characterized in that, The detection and control module includes a control unit and an adjustment unit. The control unit is connected to the adjustment unit, and the adjustment unit is connected to the power detection module. The control unit is used to control the adjustment unit to disconnect from the power detection module when the output power is less than the preset power, so as to increase the detection sampling ratio of the power detection module; the power control module is used to control the power conversion module to a first working state when the voltage value corresponding to the detection signal is less than the preset voltage. The control unit is used to control the adjustment unit to connect with the power detection module when the output power is greater than or equal to the preset power, so as to reduce the detection sampling ratio of the power detection module; the power control module is also used to control the power conversion module to a second working state when the voltage value corresponding to the detection signal is greater than the preset voltage.

3. The power supply circuit according to claim 2, characterized in that, The adjustment unit includes a first capacitor, one end of which is connected to the power detection module, and the other end of which is connected to the control unit.

4. The power supply circuit according to claim 2, characterized in that, The control unit includes two diodes, with pin 1 connected to and pin 2 grounded, and pin 3 connected to the adjustment unit.

5. The power supply circuit according to claim 2, characterized in that, The power conversion module includes a transformer and a resonant capacitor. One end of the resonant capacitor is connected to the transformer, and the other end of the resonant capacitor is grounded. The control unit includes a control subunit and a detection subunit. The control subunit is connected to the detection subunit and the adjustment unit. The detection subunit is also connected to one end of the resonant capacitor. The detection subunit is used to detect the voltage of the resonant capacitor to output a first sampling voltage; the control subunit is used to control the adjustment unit to disconnect from the power detection module when the first sampling voltage is less than the reference voltage. The control subunit is used to control the adjustment unit to connect to the power detection module when the first sampled voltage is greater than the reference voltage.

6. The power supply circuit according to claim 2, characterized in that, The power conversion module includes a transformer and a resonant capacitor. One end of the resonant capacitor is connected to the transformer, and the other end of the resonant capacitor is grounded. The control unit includes a control subunit and a detection subunit. The control subunit is connected to the detection subunit and the adjustment unit. The detection subunit is also connected to one end of the resonant capacitor. The detection subunit is used to detect the current of the resonant capacitor to output a second sampling voltage; the control subunit is used to control the adjustment unit to disconnect from the power detection module when the second sampling voltage is less than the reference voltage. The control subunit is used to control the adjustment unit to connect to the power detection module when the second sampled voltage is greater than the reference voltage.

7. The power supply circuit according to claim 5, characterized in that, The detection subunit includes a second capacitor and a third capacitor. One end of the second capacitor is connected to one end of the resonant capacitor, and the other end of the second capacitor is connected to one end of the third capacitor. One end of the third capacitor is also connected to the control subunit, and the other end of the third capacitor is grounded.

8. The power supply circuit according to claim 6, characterized in that, The detection subunit includes a fourth capacitor and a sampling resistor. One end of the fourth capacitor is connected to one end of the resonant capacitor, and the other end of the fourth capacitor is connected to one end of the sampling resistor. One end of the sampling resistor is also connected to the control subunit, and the other end of the sampling resistor is grounded.

9. The power supply circuit according to claim 5 or 6, characterized in that, The control subunit includes a controller and a switch. The controller is connected to the first terminal of the switch and the detection subunit, the second terminal of the switch is connected to the adjustment unit, and the third terminal of the switch is grounded.

10. The power supply circuit according to any one of claims 1-8, characterized in that, The power detection module includes a fifth capacitor and a sixth capacitor. One end of the fifth capacitor is connected to the power conversion module, and the other end of the fifth capacitor is connected to one end of the sixth capacitor and the power detection module. One end of the sixth capacitor is connected to the power control module, and the other end of the sixth capacitor is grounded.

11. An electronic device, characterized in that, The electronic device includes a power supply circuit as described in any one of claims 1-10.

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