Power supply control circuit and equipment

Abstract

The utility model discloses a power supply control circuit and equipment. The circuit comprises an abnormal voltage signal generation circuit; the abnormal voltage signal generation circuit at least comprises a first resistor, a second resistor and a first switching tube; the battery voltage sampling end is connected with the first end of the first switch tube through the first resistor, and the second end of the first switch tube is connected with the reference potential end; the control signal end is connected with the control end of the first switch tube through the second resistor; the control signal end is used for accessing a control signal, and the control signal is used for controlling the on-off of the first switching tube; when the first switch tube is switched on, the potential of the battery voltage sampling end changes.

Description

Technical Field

[0001] The embodiments of the present utility model relate to electronic circuit technologies, and in particular, to a power control circuit and device. Background Art

[0002] A battery is a common power supply unit. When the battery in a device is not used for a long time, the following problems are likely to occur: The battery itself also has a certain degree of self-discharge phenomenon. If the battery is connected to the circuit for a long time and is in a charged state, the self-discharge will continue, resulting in a gradual attenuation of the battery capacity and shortening the service life of the battery; if there are some minor leaks or standby power consumptions in the circuit connected to the battery, the long-term accumulation may cause the battery to be over-discharged. Over-discharge will damage the chemical structure of the battery, further reducing the battery performance, and may even cause the battery to be unable to be recharged or the capacity to drop significantly; in some special cases, such as battery aging, quality problems or external environmental influences (high temperature, etc.), the battery that is not disconnected for a long time may have safety problems such as overheating, leakage, swelling or even explosion, posing risks to the device and personnel.

[0003] Currently, the power supply circuit of the battery usually only disconnects the battery circuit passively when a fault occurs in the device (such as overvoltage, overcurrent, over-temperature and other faults), and cannot actively disconnect the battery circuit when the device does not have a fault. As a result, when the battery is not used for a long time, power consumption still occurs, causing battery damage. Summary of the Utility Model

[0004] The present utility model provides a power control circuit and device to achieve the purpose of actively generating a battery circuit cut-off signal.

[0005] In a first aspect, an embodiment of the present utility model provides a power control circuit, including: an abnormal voltage signal generation circuit;

[0006] The abnormal voltage signal generation circuit at least includes a first resistor, a second resistor and a first switching tube;

[0007] A battery voltage sampling terminal is connected to a first end of the first switching tube through the first resistor, and a second end of the first switching tube is connected to a reference potential terminal;

[0008] A control signal terminal is connected to a control end of the first switching tube through the second resistor;

[0009] The control signal terminal is used to access a control signal, and the control signal is used to control the on / off of the first switching tube;

[0010] When the first switching tube is turned on, the potential of the battery voltage sampling terminal changes.

[0011] Optionally, it further includes a control unit and a key circuit;

[0012] The key circuit is connected to the control unit;

[0013] The first signal detection terminal of the control unit is connected to the key circuit, and the first signal output terminal of the control unit is connected to the control signal terminal;

[0014] The second signal detection terminal of the control unit is connected to the battery voltage sampling terminal;

[0015] The control unit is configured to generate the control signal according to the key signal of the key circuit and generate a power control signal according to the sampling signal of the battery voltage sampling terminal.

[0016] Optionally, it further includes a battery charge and discharge circuit, and the charge and discharge circuit includes a second switching tube and a third switching tube connected in series;

[0017] The second signal output terminal and the third signal output terminal of the control unit are respectively connected to the control terminals of the second switching tube and the third switching tube;

[0018] The second signal output terminal and the third signal output terminal are used to output the power control signal.

[0019] Optionally, the control unit includes a first control chip and a second control chip;

[0020] The first control chip configures the first signal detection terminal and the first signal output terminal;

[0021] The second control chip configures the second signal detection terminal, the second signal output terminal, and the third signal output terminal.

[0022] Optionally, the key circuit includes a key, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a second switching tube;

[0023] The signal terminal of the key is connected to the control terminal of the second switching tube;

[0024] The power supply terminal is connected to the first capacitor through the third resistor, and the first capacitor is connected in parallel with the second capacitor;

[0025] The first capacitor is connected to the first end of the second switching tube through the fourth resistor, and the second end of the second switching tube is connected to the reference level terminal;

[0026] The first signal detection terminal of the control unit is connected to the connection point of the first capacitor and the fourth resistor.

[0027] Optionally, it further includes a reset chip;

[0028] The first signal terminal of the reset chip is connected to the connection point of the first capacitor and the fourth resistor, and the second signal terminal of the reset chip is connected to the first control chip.

[0029] Optionally, an overvoltage protection circuit is further included, and the overvoltage protection circuit is connected to the third signal detection terminal of the control unit;

[0030] The control unit is further configured to generate the control signal according to the output of the overvoltage protection circuit.

[0031] Optionally, an overcurrent protection circuit is further included, and the overcurrent protection circuit is connected to the fourth signal detection terminal of the control unit;

[0032] The control unit is further configured to generate the control signal according to the output of the overcurrent protection circuit.

[0033] Optionally, an overtemperature protection circuit is further included, and the overtemperature protection circuit is connected to the fifth signal detection terminal of the control unit;

[0034] The control unit is further configured to generate the control signal according to the output of the overtemperature protection circuit.

[0035] In a second aspect, an embodiment of the present invention further provides a device, including any one of the power control circuits described in the embodiments of the present invention.

[0036] Compared with the prior art, the beneficial effect of the present invention is that: the present invention proposes a power control circuit, which includes an abnormal voltage signal generation circuit, and the abnormal voltage signal generation circuit includes a first switching tube. This circuit can receive a manually input control signal, change the on-off state of the first switching tube based on the control signal, and then change the potential of the battery voltage sampling terminal. Based on this, it is possible to actively cause an abnormal battery voltage manually, and based on the abnormal battery voltage state, a preset battery pipeline strategy can be further implemented, such as cutting off the charge and discharge circuit of the battery, to achieve manual active control of the battery power circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of the power control circuit in the embodiment;

[0038] Figure 2 is a schematic structural diagram of another power control circuit in the embodiment;

[0039] Figure 3 is a schematic structural diagram of the battery charge and discharge circuit in the embodiment;

[0040] Figure 4 is a schematic structural diagram of the key circuit in the embodiment. Detailed implementation manners

[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.

[0042] Embodiment 1

[0043] Figure 1 is a schematic structural diagram of the power control circuit in the embodiment. Refer to Figure 1 , the power control circuit includes an abnormal voltage signal generation circuit;

[0044] The abnormal voltage signal generation circuit at least includes a first resistor R143, a second resistor R144, and a first switching tube Q22;

[0045] The battery voltage sampling terminal VBAT is connected to the first end of the first switching tube Q22 through the first resistor R143, and the second end of the first switching tube Q22 is connected to the reference potential terminal (ground);

[0046] The control signal terminal IO is connected to the control end of the first switching tube Q22 through the second resistor R144;

[0047] The control signal terminal IO is used to access a control signal, and the control signal is used to control the on / off of the first switching tube Q22;

[0048] When the first switching tube Q22 is turned on, the potential of the battery voltage sampling terminal VBAT changes.

[0049] Exemplarily, in this solution, the first resistor R143 serves as a current limiting resistor, and the second resistor R144 is mainly used to match the output impedance of the control signal source, so that the control signal can be better transmitted to the gate of the MOS tube, improving the integrity and reliability of the control signal.

[0050] Exemplarily, in this solution, the first switching tube Q22 can be an NMOS tube, and the working process of the abnormal voltage signal generation circuit includes:

[0051] When the control signal terminal IO receives a high-level control signal, the first switching tube Q22 is turned on, and the potential of the battery voltage sampling terminal VBAT is pulled down from the battery voltage;

[0052] When the control signal terminal IO does not receive a control signal, the first switching tube Q22 is turned off, and the potential of the battery voltage sampling terminal VBAT is the battery voltage.

[0053] Exemplarily, in this solution, the voltage sampling value of the battery voltage sampling terminal VBAT can be used to implement specified control logic;

[0054] For example, when it is detected that the potential of the battery voltage sampling terminal VBAT is pulled down from the battery voltage, a specified controller can be configured to cut off the battery power circuit.

[0055] Exemplarily, in this solution, the control signal can be manually input or automatically generated by configuring a specified controller.

[0056] Reference Figure 1 , the abnormal voltage signal generation circuit may further include a capacitor C142 and a resistor R145, where the capacitor C142 and the resistor R145 are connected in parallel between the control terminal and the second terminal of the first switching transistor Q22.

[0057] Exemplarily, in this solution, the capacitor C142 and the resistor R145 are mainly used for:

[0058] Filtering high-frequency noise and interference from the gate control signal line, making the gate voltage of the MOS transistor more stable and reducing the possibility of malfunction.

[0059] Slowing down the switching speed: The presence of the capacitor will make the rise and fall times of the gate voltage longer, thereby slowing down the switching speed of the MOS transistor;

[0060] When the MOS transistor is turned off, the charge on the gate capacitor needs to be released through the resistor to ensure that the MOS transistor can be turned off quickly and reliably;

[0061] In some cases, such as when the circuit is powered off or the control signal is lost, the parallel resistor can prevent the gate from floating and being in an uncertain state, reducing possible false triggering and damage.

[0062] This embodiment provides a power control circuit, which includes an abnormal voltage signal generation circuit. The abnormal voltage signal generation circuit includes a first switching transistor. This circuit can receive a manually input control signal, change the on / off state of the first switching transistor based on the control signal, and then change the potential of the battery voltage sampling terminal. Based on this, it is possible to artificially and actively cause an abnormal battery voltage. Based on the abnormal battery voltage state, a preset battery pipeline strategy can be further implemented, such as cutting off the charge and discharge loop of the battery to achieve artificial and active control of the battery power circuit.

[0063] Figure 2 is a schematic diagram of another structure of the power control circuit in the embodiment. Reference Figure 2 , in Figure 1 Based on the solution shown, in an implementable solution, the power control circuit further includes a control unit 100 and a key circuit 200;

[0064] The key circuit 200 is connected to the control unit 100;

[0065] The first signal detection end of the control unit 100 is connected to the key circuit 200, and the first signal output end of the control unit 100 is connected to the control signal terminal IO;

[0066] The second signal detection end of the control unit 100 is connected to the battery voltage sampling terminal VBAT;

[0067] The control unit 100 is configured to generate a control signal according to the key signal of the key circuit 200 and generate a power control signal according to the sampling signal of the battery voltage sampling terminal VBAT.

[0068] Exemplarily, in this solution, the key circuit 200 is used to manually generate a control signal, that is, when the control unit 100 detects that a key in the key circuit 200 is manually operated (such as continuous pressing, single pressing, or long pressing, etc.), the control unit 100 generates a control signal.

[0069] Exemplarily, in this solution, the control unit 100 is further configured to generate a power control signal according to the sampling signal of the battery voltage sampling terminal VBAT. For example, when the control unit 100 detects that the potential of the battery voltage sampling terminal VBAT is pulled down from the battery voltage, a power control signal is generated.

[0070] Exemplarily, in this solution, the power control signal can be configured to control the on / off of the battery power circuit or the charge / discharge circuit where the battery is located.

[0071] Figure 3 It is a schematic diagram of the battery charge / discharge circuit structure in the embodiment. Refer to Figure 3 , on the basis of the above-mentioned solution where the control unit can output a power control signal, in an implementable solution, the power control circuit further includes a battery charge / discharge circuit, and the charge / discharge circuit includes a second switching tube Q1 and a third switching tube Q2 connected in series;

[0072] The second signal output end and the third signal output end of the control unit 100 are respectively connected to the control ends of the second switching tube Q1 and the third switching tube Q2;

[0073] The second signal output end and the third signal output end are used to output a power control signal.

[0074] Exemplarily, in this solution, the power control signal specifically includes a first power control signal and a second power control signal;

[0075] Among them, the first power control signal is used to control the conduction or cut-off of the second switching tube Q1, and the second power control signal is used to control the conduction or cut-off of the third switching tube Q2.

[0076] Exemplarily, in this solution, the first power control signal can be configured to control the second switching transistor Q1 to turn off, and the second power control signal can be configured to control the third switching transistor Q2 to turn off.

[0077] Exemplarily, in this solution, the second switching transistor Q1 and the third switching transistor Q2 are simultaneously turned off through the power control signal, so as to disconnect the negative electrode of the battery 1 from the ground P-, thereby slowing down the self-discharge of the battery 1.

[0078] On the basis of the solution in which the foregoing power control circuit includes a control unit, in an implementable solution, the control unit includes a first control chip and a second control chip;

[0079] The first control chip is configured with a first signal detection terminal and a first signal output terminal;

[0080] The second control chip is configured with a second signal detection terminal, a second signal output terminal, and a third signal output terminal.

[0081] Exemplarily, in this solution, the first control chip can adopt an MCU (Microcontroller Unit), and the second control signal can adopt a (lithium) battery protection chip.

[0082] In this solution, the first control chip is used to collect the signals of the key circuit and output a control signal (for controlling the first switching transistor Q22) according to the key circuit;

[0083] The second control chip is used to sample the voltage of the battery voltage sampling terminal VBAT and generate a power control signal for controlling the second switching transistor Q1 and the third switching transistor Q2 according to the sampled voltage.

[0084] Figure 4 It is a schematic diagram of the key circuit structure in the embodiment. Refer to Figure 4 , on the basis of the solution in which the foregoing power control circuit includes a key circuit, in an implementable solution, the key circuit includes a key S1, a third resistor R36, a fourth resistor R146, a first capacitor C18, a second capacitor C17, and a fourth switching transistor Q33;

[0085] The signal terminal HARD_KEY of the key S1 is connected to the control terminal of the fourth switching transistor Q33;

[0086] The power supply terminal VDD is connected to the first capacitor C18 through the third resistor R36, and the first capacitor C18 is connected in parallel with the second capacitor C17;

[0087] The first capacitor C18 is connected to the first end of the fourth switching transistor Q33 through the fourth resistor R146, and the second end of the fourth switching transistor Q33 is connected to the reference level terminal;

[0088] The first signal detection terminal of the control unit is connected to the connection point of the first capacitor C18 and the fourth resistor R146.

[0089] Exemplarily, in this solution, one end of the (physical) button S1 is grounded, and the other end is connected (through a circuit) to the HARD_KEY pin.

[0090] When the button S1 is pressed, the HARD_KEY pin is grounded through the button S1 and becomes low level. The fourth MOS transistor is turned off, and the second capacitor C17 is in a charging state. When the button S1 is not pressed, the capacitor C17 starts to discharge.

[0091] By detecting the change in the level state of the second capacitor C17, the control unit can determine whether the button S1 is pressed, so as to implement corresponding functions, for example, generating a control signal.

[0092] Exemplarily, in this solution, the third resistor R36 is used as a current-limiting resistor, the fourth resistor R146 is used as a pull-up resistor, the first capacitor C18 (and the second capacitor C17) is used as an energy storage capacitor, and the clamping diode D1 is used for clamping the voltage of the HARD_KEY pin.

[0093] Reference Figure 4 , further, in an implementable solution, the button circuit further includes a reset chip U4.

[0094] The first signal terminal SRT of the reset chip U4 is connected to the connection point of the first capacitor C18 and the fourth resistor R146, and the second signal terminal (reset terminal HARD_RST) of the reset chip U4 is connected to the first control chip.

[0095] Exemplarily, in this solution, the first signal terminal SRT of the reset chip U4 is used to generate a specified reset signal according to the signal received by the second signal terminal HARD_RST, thereby changing the charge and discharge states of the first capacitor C18 and / or the second capacitor C17, and further realizing the reset of the button.

[0096] On the basis of any of the foregoing solutions, in an implementable solution, the power control circuit further includes an overvoltage protection circuit, and the overvoltage protection circuit is connected to the third signal detection terminal of the control unit.

[0097] The control unit is further configured to generate a control signal according to the output of the overvoltage protection circuit.

[0098] Exemplarily, in this solution, the control unit and the overvoltage protection circuit are used to implement overvoltage protection of the battery. Among them, the structure of the overvoltage protection circuit is the same as that of the prior art, and the specific content will not be elaborated here.

[0099] Based on any of the foregoing solutions, the power control circuit further includes an overcurrent protection circuit, and the overcurrent protection circuit is connected to the fourth signal detection terminal of the control unit;

[0100] The control unit is further configured to generate a control signal according to the output of the overcurrent protection circuit.

[0101] Exemplarily, in this solution, the control unit and the overcurrent protection circuit are used to implement overcurrent protection of the battery. Among them, the structure of the overcurrent protection circuit is the same as that of the prior art, and the specific content will not be elaborated here.

[0102] Based on any of the foregoing solutions, in an implementable solution, the power control circuit further includes an overtemperature protection circuit, and the overtemperature protection circuit is connected to the fifth signal detection terminal of the control unit;

[0103] The control unit is further configured to generate a control signal according to the output of the overtemperature protection circuit.

[0104] Exemplarily, in this solution, the control unit and the overtemperature protection circuit are used to implement overtemperature protection of the battery. Among them, the structure of the overtemperature protection circuit is the same as that of the prior art, and the specific content will not be elaborated here.

[0105] Combined with Figures 1 to 4 , based on any of the foregoing solutions, the power control circuit includes an abnormal voltage signal generation circuit, and the abnormal voltage signal generation circuit includes a first resistor R143, a second resistor R144, a first switching transistor Q22, a capacitor C142, and a resistor R145;

[0106] The battery voltage sampling terminal VBAT is connected to the first end of the first switching transistor Q22 through the first resistor R143, and the second end of the first switching transistor Q22 is connected to the reference potential terminal (ground);

[0107] The control signal terminal IO is connected to the control end of the first switching transistor Q22 through the second resistor R144;

[0108] The capacitor C142 and the resistor R145 are connected in parallel between the control end and the second end of the first switching transistor Q22;

[0109] It further includes a first control chip, a second control chip, a key circuit, and a charge and discharge circuit;

[0110] Among them, the key circuit includes a key S1, a third resistor R36, a fourth resistor R146, a first capacitor C18, a second capacitor C17, and a fourth switching transistor Q33;

[0111] The signal terminal HARD_KEY of the key S1 is connected to the control end of the fourth switching transistor Q33;

[0112] The power supply terminal VDD is connected to the first capacitor C18 through the third resistor R36, and the first capacitor C18 is in parallel with the second capacitor C17;

[0113] The first capacitor C18 is connected to the first end of the fourth switching transistor Q33 through the fourth resistor R146, and the second end of the fourth switching transistor Q33 is connected to the reference level terminal;

[0114] The first signal detection terminal of the first control chip is connected to the connection point of the first capacitor C18 and the fourth resistor R146, and the first signal output terminal of the first control chip is connected to the control signal terminal IO;

[0115] The key circuit further includes a reset chip U4;

[0116] The first signal terminal SRT of the reset chip U4 is connected to the connection point of the first capacitor C18 and the fourth resistor R146, and the second signal terminal (reset terminal HARD_RST) of the reset chip U4 is connected to the first control chip;

[0117] The charge and discharge circuit includes a second switching transistor Q1 and a third switching transistor Q2 connected in series;

[0118] Configure the second signal detection terminal of the second control chip to be connected to the battery voltage sampling terminal VBAT;

[0119] Configure the second signal output terminal and the third signal output terminal of the second control chip to be respectively connected to the control terminals of the second switching transistor Q1 and the third switching transistor Q2, and the second signal output terminal and the third signal output terminal are used to output power control signals;

[0120] It further includes an overvoltage protection circuit, an overcurrent protection circuit, and an overtemperature protection circuit;

[0121] The overvoltage protection circuit is connected to the third signal detection terminal of the second control chip, the overcurrent protection circuit is connected to the fourth signal detection terminal of the second control chip, and the overtemperature protection circuit is connected to the fifth signal detection terminal of the second control chip.

[0122] In this solution, configure the first control chip to generate a control signal when receiving the key signal generated by the key circuit, and the control signal is used to control the first switching transistor Q22 to conduct, thereby changing the potential at the position of the battery voltage sampling terminal VBAT;

[0123] Configure the second control chip to control the second switching transistor Q1 and the third switching transistor Q2 to turn off when detecting a potential change at the battery voltage sampling terminal VBAT;

[0124] In addition, configure the second control chip to control the second switching transistor Q1 and the third switching transistor Q2 to turn off when detecting the overvoltage signal, overcurrent signal, and overtemperature signal respectively output by the overvoltage protection circuit, overcurrent protection circuit, and overtemperature protection circuit;

[0125] Meanwhile, a second control chip is configured to detect the voltage at the ground P- in the charge and discharge circuit. When there is a charging operation, the voltage at the ground P- changes. At this time, the second control chip controls the second switching transistor Q1 and the third switching transistor Q2 to work according to the specified on-off states, thereby activating the charge and discharge circuit of the battery and completing the normal charge and discharge process.

[0126] Embodiment 2

[0127] This embodiment provides a device, including any one of the power control circuits described in Embodiment 1. The implementation manner and beneficial effects of the power control circuit are the same as the corresponding contents described in Embodiment 1, and the specific contents will not be elaborated here.

[0128] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power control circuit, characterized in that, Comprising: An abnormal voltage signal generation circuit; The abnormal voltage signal generation circuit at least includes a first resistor, a second resistor, and a first switching tube; A battery voltage sampling terminal is connected to a first end of the first switching tube through the first resistor, and a second end of the first switching tube is connected to a reference potential terminal; A control signal terminal is connected to a control end of the first switching tube through the second resistor; The control signal terminal is used for accessing a control signal, and the control signal is used to control the on / off of the first switching tube; When the first switching tube is turned on, the potential of the battery voltage sampling terminal changes.

2. The power control circuit according to claim 1, characterized in that, It further includes a control unit and a key circuit; The key circuit is connected to the control unit; A first signal detection terminal of the control unit is connected to the key circuit, and a first signal output terminal of the control unit is connected to the control signal terminal; A second signal detection terminal of the control unit is connected to the battery voltage sampling terminal; The control unit is configured to generate the control signal according to a key signal of the key circuit, and generate a power control signal according to a sampling signal of the battery voltage sampling terminal.

3. The power control circuit according to claim 2, wherein It further includes a battery charge and discharge circuit, and the charge and discharge circuit includes a second switching tube and a third switching tube connected in series; A second signal output terminal and a third signal output terminal of the control unit are respectively connected to control ends of the second switching tube and the third switching tube; The second signal output terminal and the third signal output terminal are used for outputting the power control signal.

4. The power control circuit according to claim 3, characterized in that The control unit includes a first control chip and a second control chip; The first control chip configures the first signal detection terminal and the first signal output terminal; The second control chip configures the second signal detection terminal, the second signal output terminal, and the third signal output terminal.

5. The power control circuit according to claim 2, wherein The key circuit includes a key, a third resistor, a fourth resistor, a first capacitor, a second capacitor, and a fourth switching tube; A signal terminal of the key is connected to a control end of the fourth switching tube; A power supply terminal is connected to the first capacitor through the third resistor, and the first capacitor is connected in parallel with the second capacitor; The first capacitor is connected to a first end of the fourth switching tube through the fourth resistor, and a second end of the fourth switching tube is connected to a reference level terminal; The first signal detection terminal of the control unit is connected to a connection point of the first capacitor and the fourth resistor.

6. The power control circuit according to claim 5, wherein It further includes a reset chip; A first signal terminal of the reset chip is connected to a connection point of the first capacitor and the fourth resistor, and a second signal terminal of the reset chip is connected to the first control chip.

7. The power control circuit according to claim 2, characterized in that, It further includes an overvoltage protection circuit, and the overvoltage protection circuit is connected to a third signal detection terminal of the control unit; The control unit is further configured to generate the control signal according to an output of the overvoltage protection circuit.

8. The power control circuit according to claim 2, wherein It further includes an overcurrent protection circuit, and the overcurrent protection circuit is connected to a fourth signal detection terminal of the control unit; The control unit is further configured to generate the control signal according to an output of the overcurrent protection circuit.

9. The power control circuit according to claim 2, wherein It further includes an overtemperature protection circuit, and the overtemperature protection circuit is connected to a fifth signal detection terminal of the control unit; The control unit is further configured to generate the control signal according to the output of the overtemperature protection circuit.

10. A device, characterized in that, Comprising the power control circuit according to any one of claims 1 to 9.

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