Power switch control circuit and power supply

Abstract

The invention discloses a power switch control circuit and a power supply, which are applied to the field of power supply control, and comprise a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a first capacitor and a diode, the first end of the first capacitor, the first end of the first resistor and the first end of the first switching tube are connected with a power input end. The first end of the second resistor, the first end of the second switch tube and the first end of the third resistor are connected with the second end of the first resistor; the second end of the second resistor, the control end of the first switch tube and the cathode of the diode are connected with the second end of the first capacitor; the second end of the third resistor is connected with the anode of the diode; the second end of the first switching tube is connected with the power output end; the second end of the second switch tube is grounded, and the control end of the second switch tube is connected with a circuit power switch control signal end. The circuit is only composed of the switch tube, the capacitor and the resistor, the cost is low, and the power-on and power-off rate of the power supply can be flexibly regulated and controlled by changing the size of the resistor and the capacitor.

Description

Technical Field

[0001] The present invention relates to the field of power supply control, and in particular to a power supply switch control circuit and a power supply. Background Art

[0002] In many circuit designs, it is necessary to perform timing control on power signals based on actual needs. Currently, when performing timing control on power signals, in order to achieve fast power on and off of products, power management chips are usually used to control the switching time of power signals. However, there are still problems such as high chip cost and inability to flexibly adjust the power signal turn-on time and power switch off rate.

[0003] Therefore, how to control the power switch at low cost and flexibly adjust its speed is an urgent problem to be solved. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a power switch control circuit and a power supply, which are used to solve the problem that the power switch cannot be controlled at low cost and its speed cannot be flexibly adjusted. The specific scheme is as follows:

[0005] In order to solve the above technical problems, the present application provides a power switch control circuit, including: a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a first capacitor, and a diode;

[0006] The first end of the first capacitor, the first end of the first resistor, and the first end of the first switch are connected to the power input end;

[0007] The first end of the second resistor, the first end of the second switch tube, and the first end of the third resistor are connected to the second end of the first resistor;

[0008] The second end of the second resistor, the control end of the first switch tube, and the cathode of the diode are connected to the second end of the first capacitor;

[0009] The second end of the third resistor is connected to the anode of the diode, and the resistance of the third resistor is much smaller than the resistance of the second resistor;

[0010] The second end of the first switch tube is connected to the power output end, and is used to control the current flow between the power input end and the power output end;

[0011] The second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the circuit power switch control signal end, which is used to control the current flow between the common end of the first resistor and the second resistor and the ground end.

[0012] As an optional solution, the above power switch control circuit further includes: a discharge circuit for controlling the power output end to discharge to zero potential.

[0013] As an optional solution, in the above power switch control circuit, the discharge circuit includes: a third switch tube, a fourth resistor, and a second capacitor;

[0014] The first end of the fourth resistor is connected to the power output end, and the second end of the fourth resistor is connected to the first end of the third switch tube;

[0015] The second end of the third switch tube is grounded, and the control end of the third switch tube is connected to the second end of the first resistor, so as to control the discharge of the second capacitor;

[0016] A first end of the second capacitor is connected to the power output end, and a second end of the second capacitor is grounded.

[0017] As an optional solution, in the above power switch control circuit, the first resistor, the second resistor, and the third resistor are adjustable resistors.

[0018] As an optional solution, the device further comprises: a fifth resistor;

[0019] The first end of the fifth resistor is connected to the circuit power switch control signal end, and the second end of the fifth resistor is connected to the control end of the second switch tube, for limiting the current entering the control end of the second switch tube.

[0020] As an optional solution, in the above power switch control circuit, the first switch tube is a PMOS transistor;

[0021] The gate of the PMOS transistor is the control end of the first switch tube, the source of the PMOS transistor is the first end of the first switch tube, and the drain of the PMOS transistor is the second end of the first switch tube.

[0022] As an optional solution, in the above power switch control circuit, the second switch tube is an NPN transistor;

[0023] The base of the NPN transistor is the control end of the second switch tube, the collector of the NPN transistor is the first end of the second switch tube, and the emitter of the NPN transistor is the second end of the second switch tube.

[0024] As an optional solution, in the above power switch control circuit, the third switch tube is an NMOS transistor;

[0025] The gate of the NMOS transistor is the control terminal of the third switch tube, the source of the NMOS transistor is the second terminal of the third switch tube, and the drain of the NMOS transistor is the first terminal of the third switch tube.

[0026] As an optional solution, the power switch control circuit further includes: a sixth resistor;

[0027] A first end of the sixth resistor is connected to the base of the NPN transistor, and a second end of the sixth resistor is grounded, for providing a stable bias voltage.

[0028] In order to solve the above technical problems, the present application also provides a power supply, including the above power switch control circuit.

[0029] The power switch control circuit provided in the present application includes: a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a first capacitor, and a diode; the first end of the first capacitor, the first end of the first resistor, and the first end of the first switch tube are connected to the power input end; the first end of the second resistor, the first end of the second switch tube, and the first end of the third resistor are connected to the second end of the first resistor; the second end of the second resistor, the control end of the first switch tube, and the cathode of the diode are connected to the second end of the first capacitor; the second end of the third resistor is connected to the anode of the diode, and the resistance of the third resistor is much smaller than the resistance of the second resistor; the second end of the first switch tube is connected to the power output end, used to control the current flow between the power input end and the power output end; the second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the circuit power switch control signal end, used to control the current flow between the common end of the first resistor and the second resistor and the ground end. As can be seen from the above, the power switch control circuit of the present application is only composed of a switch tube, a capacitor and a resistor, and the cost is relatively lower. The first switch tube is located between the power input terminal and the power output terminal to control the on and off of the power supply. The second switch tube, the resistor and the capacitor combination can control the on and off of the first switch tube based on the circuit power switch control signal to realize the circuit based on the circuit power switch control signal to control the power switch off. When there is no signal at the circuit power switch control signal end, the first switch tube is turned off, the second switch tube is turned off, and there is no output at the power output end. When the circuit power switch control signal end is at a high level, the second switch tube is turned on, the first switch tube is turned on, and there is power output at the power output end. In addition, the adjustment of the values ​​of the first resistor, the second resistor, the third resistor and the first capacitor can more flexibly change the rate at which the power switch is turned off. Furthermore, due to the unidirectional conductivity of the diode and the resistance value of the third resistor is much smaller than the resistance value of the second resistor, the first capacitor is discharged through the circuit where the second resistor is located and is charged through the circuit where the third resistor is located. By changing the resistance value of the second resistor, the discharge speed of the first capacitor can be adjusted independently and thus only the power-on speed of the power switch control circuit can be changed. Similarly, by changing the resistance value of the first resistor or the third resistor, the charging speed of the capacitor can be adjusted independently and thus only the power-off speed of the power switch control circuit can be changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 A circuit diagram of a power switch control circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The core of this application is to provide a power switch control circuit and a power supply.

[0034] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] In many circuit designs, it is necessary to perform timing control on power signals based on actual needs. Currently, when performing timing control on power signals, in order to achieve fast power on and off of products, chips are usually used to control the turn-on time of the power signals. However, there are still problems such as high chip cost and inability to flexibly adjust the turn-on time of the power signal and the power switch off rate.

[0036] Therefore, how to control the power switch at low cost and flexibly adjust its speed is an urgent problem to be solved.

[0037] Figure 1 A circuit diagram of a power switch control circuit provided in an embodiment of the present application. It can be understood that: Figure 1 This is just a specific circuit structure, and does not mean that there is only one implementation method. In order to solve the above problem, this embodiment provides a power switch control circuit, including:

[0038] A first switch tube T1, a second switch tube T2, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a diode D1;

[0039] The first end of the first capacitor C1, the first end of the first resistor R1, and the first end of the first switch tube T1 are connected to the power input end;

[0040] The first end of the second resistor R2, the first end of the second switch tube T2, and the first end of the third resistor R3 are connected to the second end of the first resistor R1;

[0041] The second end of the second resistor R2, the control end of the first switch tube T1, and the cathode of the diode D1 are connected to the second end of the first capacitor C1;

[0042] The second end of the third resistor R3 is connected to the anode of the diode D1, and the resistance of the third resistor R3 is much smaller than the resistance of the second resistor R2;

[0043] The second end of the first switch tube T1 is connected to the power output end, and is used to control the current flow between the power input end and the power output end;

[0044] The second end of the second switch tube T2 is grounded, and the control end of the second switch tube T2 is connected to the circuit power switch control signal end, for controlling the current flow between the common end of the first resistor R1 and the second resistor R2 and the ground end.

[0045] When the circuit is in the initial state, there is no signal output from the circuit power switch control signal terminal. Since the base of the second switch tube T2 is grounded through the sixth resistor R6 and the voltage is zero, the second switch tube T2 is turned off, and the gate of the first switch tube T1 is pulled up to the same potential as the power input terminal by the first resistor R1 and the second resistor R2, the gate-source voltage difference is 0, and the first switch tube T1 is turned off.

[0046] During the power-on process, when the circuit power switch control signal end outputs a high voltage, the second switch tube T2 is turned on, causing the first capacitor C1 to start discharging. Due to the unidirectional conductivity of the diode D1, the first capacitor C1 is discharged only through the branch where the second resistor R2 is located. As the first capacitor C1 continues to discharge, the gate voltage of the first switch tube T1 gradually becomes zero, the first switch tube T1 is turned on, and the power output end begins to output power, thereby realizing the control of the circuit power switch control signal end over the power on.

[0047] During the power-off process, when the circuit power switch control signal end outputs a low voltage, the second switch tube T2 is turned off, so that the first capacitor C1 starts to charge. At this time, the diode D1 is turned on, and because the resistance of the third resistor R3 is much smaller than the resistance of the second resistor R2, the first capacitor C1 is charged through the branch where the third resistor R3 is located. As the first capacitor C1 continues to charge, the gate-source voltage difference of the first switch tube T1 gradually becomes zero, the first switch tube T1 is turned off, and there is no output at the power output end, thereby realizing the control of the circuit power switch control signal segment to shut down the power supply.

[0048] It can be understood that adjusting the capacitance value of the first capacitor C1 can simultaneously regulate the speed of power on and off. Since the resistance value of the third resistor R3 is much smaller than the resistance value of the second resistor R2 and the existence of the diode D1, during the power-on process, the first capacitor C1 can only discharge through the second resistor R2, and during the power-off process, the first capacitor C1 can only charge through the first resistor R1, the third resistor R3 and the diode D1. Therefore, adjusting the second resistor R2 can achieve separate adjustment of the power-on speed, and adjusting the first resistor R1 or the third resistor R3 can achieve separate adjustment of the power-off speed.

[0049] It should be noted that the direct connection between the control end of the second switch tube T2 and the circuit power switch control signal end may cause the control end current of the second switch tube T2 to be too large, resulting in damage to the second switch tube T2. Therefore, it is necessary to install a fifth resistor R5 as a current limiting resistor between the control end of the second switch tube T2 and the circuit power switch control signal end to control the current entering the control end of the second switch tube T2. In addition, when the second switch tube T2 is a triode, or the second switch tube T2 is a MOS tube and a voltage bias is required to determine the correct conduction and shutdown, it is also necessary to install a sixth resistor R6 as a bias resistor between the control end of the second switch tube T2 and the ground end to apply a specific voltage or current to control the conduction state of the second switch tube T2.

[0050] The power switch control circuit provided in the embodiment of the present application includes: a first switch tube T1, a second switch tube T2, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a diode D1; the first end of the first capacitor C1, the first end of the first resistor R1, and the first end of the first switch tube T1 are connected to the power input end; the first end of the second resistor R2, the first end of the second switch tube T2, and the first end of the third resistor R3 are connected to the second end of the first resistor R1; the second end of the second resistor R2, the control end of the first switch tube T1, and the cathode of the diode D1 are connected to the second end of the first capacitor C1; the second end of the third resistor R3 is connected to the anode of the diode D1, and the resistance of the third resistor R3 is much smaller than the resistance of the second resistor R2; the second end of the first switch tube T1 is connected to the power output end, for controlling the current flow between the power input end and the power output end; the second end of the second switch tube T2 is grounded, and the control end of the second switch tube T2 is connected to the circuit power switch control signal end, for controlling the current flow between the common end of the first resistor R1 and the second resistor R2 and the ground end. As can be seen from the above, the power switch control circuit of the present application is only composed of a switch tube, a capacitor and a resistor, and the cost is relatively lower. The first switch tube T1 is located between the power input end and the power output end to control the on and off of the power supply. The second switch tube T2, the resistor and the capacitor combination can control the shutdown of the first switch tube T1 based on the circuit power switch control signal to realize the circuit based on the circuit power switch control signal to control the power switch off. In addition, the adjustment of the resistance value of the first resistor R1, the second resistor R2, the third resistor R3 and the capacitance value of the first capacitor C1 can more flexibly change the rate of power switch off. Furthermore, due to the unidirectional conductivity of the diode and the resistance of the third resistor R3 is much smaller than the resistance of the second resistor R2, the first capacitor C1 is discharged through the circuit where the second resistor R2 is located, and the circuit where the third resistor R3 is located is charged. By changing the resistance of the second resistor R2, the discharge speed of the first capacitor C1 can be adjusted individually, thereby only changing the power-on speed of the power switch control circuit. Similarly, by changing the resistance of the first resistor R1 or the third resistor R3, the charging speed of the first capacitor C1 can be adjusted individually, thereby only changing the power-off speed of the power switch control circuit.

[0051] According to the above embodiment, in order to prevent excessive current from damaging the second switch tube T2, this embodiment provides a specific solution, such as Figure 1 As shown, the power switch control circuit further includes: a fifth resistor R5;

[0052] A first end of the fifth resistor R5 is connected to the circuit power switch control signal end, and a second end of the fifth resistor R5 is connected to the control end of the second switch tube T2, for limiting the current entering the control end of the second switch tube T2.

[0053] It is understandable that when the input current of the switch tube is greater than its rated current, it will cause it to overheat or even be damaged. Therefore, it is necessary to connect a fifth resistor R5 as a current limiting resistor between the control end of the second switch tube T2 and the circuit power switch control signal end to alleviate the current impact at the moment of conduction when the circuit power switch control signal end becomes a high level.

[0054] As can be seen from the above, connecting the fifth resistor R5 between the control end of the second switch tube T2 and the circuit power switch control signal end can alleviate the current impact that exists instantly when the circuit power switch control signal end is at a high level, thereby preventing the second switch tube T2 from being damaged due to a sudden excessive current.

[0055] According to the above embodiment, in order to realize the control of the circuit power switch control signal terminal to turn on and off the power, this embodiment provides a specific solution, such as Figure 1 As shown, the first switch tube T1 is a PMOS tube;

[0056] The gate of the PMOS transistor is the control end of the first switch tube T1 , the source of the PMOS transistor is the first end of the first switch tube T1 , and the drain of the PMOS transistor is the second end of the first switch tube T1 .

[0057] It can be understood that, according to the properties of the PMOS transistor, in the initial power-on state, the gate-source voltage difference is zero, and the PMOS transistor is in the off state. When the circuit power switch control signal terminal outputs a high level, the second switch tube T2 is turned on, the first capacitor C1 discharges until the gate voltage of the PMOS transistor is zero, and the PMOS transistor turns on the connection between the power input terminal and the power output terminal, so that the power output terminal starts to output power, and the circuit power switch control signal terminal controls the power on. In addition, when the circuit power switch control signal terminal outputs a low level, the second switch tube T2 is turned off, the first capacitor C1 is charged until the gate-source voltage difference of the PMOS transistor is zero, the PMOS transistor turns off the connection between the power input terminal and the power output terminal, and the power output terminal has no output, and the circuit power switch control signal terminal controls the power off.

[0058] From the above, it can be concluded that the PMOS transistor turns on the connection between the power input terminal and the power output terminal when the output of the circuit power switch control signal terminal is a high level, so that the power output terminal has power output, and turns off the connection between the power input terminal and the power output terminal when the output of the circuit power switch control signal terminal is a low level, so that the power output terminal has no power output, thereby realizing the control of the circuit power switch control signal terminal on and off the power supply.

[0059] According to the above embodiment, in order to realize the control of the circuit power switch control signal terminal to turn on and off the power, this embodiment provides a specific solution, such as Figure 1 As shown, the second switch tube T2 is an NPN transistor;

[0060] The base of the NPN transistor is the control end of the second switch tube T2 , the collector of the NPN transistor is the first end of the second switch tube T2 , and the emitter of the NPN transistor is the second end of the second switch tube T2 .

[0061] In this embodiment, according to the properties of the NPN transistor, in the initial state, the NPN transistor is turned off. When the circuit power switch control signal terminal outputs a high level, the base voltage of the NPN transistor increases, the NPN transistor is turned on, so that the first capacitor C1 starts to discharge, and the gate voltage of the first switch tube T1 is pulled down to zero, the first switch tube T1 conducts the circuit between the power input terminal and the power output terminal, and the power output terminal has power output. When the circuit power switch control signal terminal outputs a low level, the base voltage of the NPN transistor decreases, the NPN transistor is turned off, the first capacitor C1 starts to charge, and the gate voltage of the first switch tube T1 is pulled up to zero, the first switch tube T1 shuts off the circuit between the power input terminal and the power output terminal, and the power output terminal has no power output.

[0062] From the above, it can be concluded that the NPN transistor is turned on when the circuit power switch control signal end outputs a high level, so that the first capacitor C1 is discharged, the first switch tube T1 is turned on, and the power output end has power output. The NPN transistor is turned off when the circuit power switch control signal end outputs a low level, so that the first capacitor C1 is charged, the first switch tube T1 is turned off, and there is no power output at the power output end, thereby realizing the control of the circuit power switch control signal end on and off the power supply.

[0063] According to the above embodiment, in order to ensure that the second switch tube T2 is correctly turned on and off when the second switch tube T2 is a triode, this embodiment provides a specific solution, such as Figure 1 As shown, the power switch control circuit further includes: a sixth resistor R6;

[0064] A first end of the sixth resistor R6 is connected to the base of the NPN transistor, and a second end of the sixth resistor R6 is grounded, for providing a stable bias voltage.

[0065] It should be noted that the second switch tube T2 may be a triode. Figure 1As shown, at this time, the second switch tube T2 is an NPN transistor. At this time, one end of the sixth resistor R6 is connected to the base of the NPN transistor, and the other end is grounded. As the base bias resistor of the above-mentioned NPN transistor, it forms a voltage divider network with the fifth resistor R5 to provide a stable voltage to the base of the transistor.

[0066] From the above, it can be seen that one end of the sixth resistor R6 is connected to the ground, and the other end is connected to the base of the transistor, and can form a voltage divider bias circuit with the fifth resistor R5 to form a voltage divider network, which provides a stable bias voltage, makes the operating point of the transistor more stable, reduces the impact of temperature changes on the operating point, and ensures the correct conduction and shutdown of the transistor.

[0067] According to the above embodiment, in order to prevent sudden voltage interruption from affecting subsequent circuits, this embodiment provides a specific solution, wherein the power switch control circuit further includes: a discharge circuit for controlling the power output terminal to discharge to zero potential.

[0068] The discharge circuit includes: a third switch tube T3, a fourth resistor R4, and a second capacitor C2;

[0069] The first end of the fourth resistor R4 is connected to the power output end, and the second end of the fourth resistor R4 is connected to the first end of the third switch tube T3;

[0070] The second end of the third switch tube T3 is grounded, and the control end of the third switch tube T3 is connected to the second end of the first resistor R1, so as to control the discharge of the second capacitor C2;

[0071] A first end of the second capacitor C2 is connected to the power output end, and a second end of the second capacitor C2 is grounded.

[0072] In a specific embodiment, the third switch tube is an NMOS transistor; the gate of the NMOS transistor is the control end of the third switch tube, the source of the NMOS transistor is the second end of the third switch tube, and the drain of the NMOS transistor is the first end of the third switch tube.

[0073] like Figure 1 As shown, in a specific embodiment, the discharge circuit can be composed of a fourth resistor R4, a third switch tube T3 and a second capacitor C2. At this time, the third switch tube T3 is an NMOS tube. When there is power output at the power output end, the second capacitor C2 is charged. When there is no power output at the power output end, the second switch tube T2 is disconnected, the control end of the third switch tube T3 is at a high potential, the third switch tube T3 is turned on, and the capacitor C2 starts to discharge. The discharge speed can be adjusted by changing the resistance value of the fourth resistor R4. The smaller the resistance value of the fourth resistor R4, the faster the discharge time.

[0074] As can be seen from the above, after the power output end of the discharge circuit starts to output power, the capacitor C2 starts to charge. When the first switch tube T1 is disconnected and there is no output at the power output end, the third switch tube T3 is turned on, and the capacitor C2 starts to discharge, so that the voltage at the power output end slowly drops to zero potential, thereby avoiding the sudden drop in the voltage at the power output end affecting the subsequent circuit.

[0075] According to the above embodiment, in order to achieve more convenient regulation of power-on and power-off rates, this embodiment provides a specific solution, wherein the first resistor R1, the second resistor R2, and the third resistor R3 are adjustable resistors.

[0076] It is understandable that if Figure 1 As shown, adjusting the resistance value of the second resistor R2 can adjust the speed of powering on the power supply, while adjusting the first resistor R1 and the third resistor R3 can adjust the speed of powering off the power supply. The larger the resistance value of the second resistor R2, the longer the discharge time of the first capacitor C1, and the larger the resistance values ​​of the first resistor R1 and the third resistor R3, the longer the charging time of the first capacitor C1. However, if the resistor is a fixed resistor, the resistor in the circuit needs to be disassembled and replaced to adjust the speed of powering on and off the power supply. Therefore, the first resistor R1, the second resistor R2, and the third resistor R3 can all be selected as variable resistors, and the adjustment part of the variable resistor and the control end of the circuit power switch control signal can be installed on the same panel to achieve more convenient regulation of the overall power supply circuit.

[0077] In addition, considering that the first capacitor C1 will also affect the power-on and power-off time of the power supply, the larger the capacitance value of the first capacitor C1 is, the longer the charging and discharging time is. Therefore, the first capacitor C1 can also be a variable capacitor.

[0078] As can be seen from the above, the first resistor R1, the second resistor R2, and the third resistor R3 are adjustable resistors, and the power-on and power-off rates of the circuit can be regulated without disassembling the circuit and replacing the resistors.

[0079] Finally, this embodiment provides a power supply, including the above-mentioned power switch control circuit.

[0080] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0081] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A power switch control circuit, characterized in that: include: A first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a first capacitor, and a diode; The first end of the first capacitor, the first end of the first resistor, and the first end of the first switch are connected to the power input end; The first end of the second resistor, the first end of the second switch tube, and the first end of the third resistor are connected to the second end of the first resistor; The second end of the second resistor, the control end of the first switch tube, and the cathode of the diode are connected to the second end of the first capacitor; The second end of the third resistor is connected to the anode of the diode, and the resistance of the third resistor is much smaller than the resistance of the second resistor; The second end of the first switch tube is connected to the power output end, and is used to control the current flow between the power input end and the power output end; The second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the circuit power switch control signal end, which is used to control the current flow between the common end of the first resistor and the second resistor and the ground end.

2. The power switch control circuit according to claim 1, characterized in that: Also includes: The discharge circuit is used to control the output end of the power supply to discharge to zero potential.

3. The power switch control circuit according to claim 2, characterized in that: The discharge circuit comprises: a third switch tube, a fourth resistor, and a second capacitor; The first end of the fourth resistor is connected to the power output end, and the second end of the fourth resistor is connected to the first end of the third switch tube; The second end of the third switch tube is grounded, and the control end of the third switch tube is connected to the second end of the first resistor, so as to control the discharge of the second capacitor; A first end of the second capacitor is connected to the power output end, and a second end of the second capacitor is grounded.

4. The power switch control circuit according to claim 1, characterized in that: The first resistor, the second resistor, and the third resistor are adjustable resistors.

5. The power switch control circuit according to claim 1, characterized in that: Also includes: a fifth resistor; The first end of the fifth resistor is connected to the circuit power switch control signal end, and the second end of the fifth resistor is connected to the control end of the second switch tube, for limiting the current entering the control end of the second switch tube.

6. The power switch control circuit according to claim 1, characterized in that: The first switch tube is a PMOS transistor; The gate of the PMOS transistor is the control end of the first switch tube, the source of the PMOS transistor is the first end of the first switch tube, and the drain of the PMOS transistor is the second end of the first switch tube.

7. The power switch control circuit according to claim 1, characterized in that: The second switch tube is an NPN transistor; The base of the NPN transistor is the control end of the second switch tube, the collector of the NPN transistor is the first end of the second switch tube, and the emitter of the NPN transistor is the second end of the second switch tube.

8. The power switch control circuit according to claim 3, characterized in that: The third switch tube is an NMOS transistor; The gate of the NMOS transistor is the control terminal of the third switch tube, the source of the NMOS transistor is the second terminal of the third switch tube, and the drain of the NMOS transistor is the first terminal of the third switch tube.

9. The power switch control circuit according to claim 7, characterized in that: Also includes: a sixth resistor; A first end of the sixth resistor is connected to the base of the NPN transistor, and a second end of the sixth resistor is grounded, for providing a stable bias voltage.

10. A power supply, characterized in that: A power switch control circuit comprising the power switch control circuit according to any one of claims 1 to 9.

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