Switch control circuit

Abstract

The utility model discloses a switch control circuit. The circuit comprises a switch control module, a power supply module and a discharge module, the switch control module is electrically connected with the power supply module and the discharge module and is used for outputting a first control signal to the power supply module and the discharge module according to a first control instruction; outputting a second control signal to the power supply module and the discharging module according to a second control instruction; the power supply module is used for starting to work under the first control signal; working is cut off under the second control signal; the power supply module is electrically connected with the discharging module; the discharging module is used for stopping discharging under the first control signal; and discharging starting is carried out under the second control signal, so that the power supply module is discharged through the discharging module. According to the scheme, normal, stable and reliable work of the high-voltage power supply module is ensured.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of high voltage power supply control, and in particular to a switch control circuit. Background Art

[0002] High voltage power supply is a necessary condition for the operation of various electronic equipment and electronic components. In order to ensure the stability and reliability of the entire high voltage power supply system, higher requirements are required for the startup and shutdown of the high voltage power supply. Utility Model Content

[0003] The utility model provides a switch control circuit, which ensures the normal and stable operation of a high-voltage power supply through a low-voltage switch control module, and also ensures the reliability of the high-voltage power supply.

[0004] The embodiment of the utility model provides a switch control circuit, which includes: a switch control module, a power module and a discharge module;

[0005] The switch control module is electrically connected to the power module and the discharge module, and is used to output a first control signal to the power module and the discharge module according to a first control instruction; and output a second control signal to the power module and the discharge module according to a second control instruction;

[0006] The power supply module is used to start working under the first control signal and stop working under the second control signal;

[0007] The power module is electrically connected to the discharge module; the discharge module is used to stop discharging under the first control signal; and start discharging under the second control signal so that the power module discharges through the discharge module.

[0008] Optionally, the power module includes a power switch control unit, a power isolation unit and a power body;

[0009] The power switch control unit is electrically connected to the switch control unit, and is used to generate a first switch action signal to the power isolation unit according to a first control signal; and is used to generate a second switch action signal to the power isolation unit according to a second control signal;

[0010] The power isolation unit is used to control the power supply body to start up according to the first switch action signal; and is also used to control the power supply body to disconnect according to the second switch action signal.

[0011] Optionally, the discharge module includes a discharge switch control unit, a discharge isolation unit and a discharge unit;

[0012] The discharge switch control unit is electrically connected to the switch control module, and is used to generate a third switch action signal to the discharge isolation unit according to the first control signal; the discharge isolation unit is used to control the discharge unit to stop discharging according to the second switch action signal;

[0013] The discharge switch control unit is further used to generate a fourth switch action signal to the discharge isolation unit according to the second control signal; the discharge isolation unit is used to control the discharge start of the discharge unit according to the fourth switch action signal.

[0014] Optionally, the switch control module includes: a first switch button, a second switch button, a first resistor, a second resistor, a first transistor, a first voltage-dividing resistor, a second voltage-dividing resistor and a second transistor;

[0015] The first end of the first switch button is electrically connected to the first end of the first resistor and the first end of the second switch button; the second end of the first resistor is electrically connected to the first end of the second resistor and to a voltage source; the second end of the second resistor is electrically connected to the second end of the first switch button;

[0016] The second end of the first resistor is electrically connected to the first end of the first transistor; the control end of the first transistor is electrically connected to the second end of the second resistor; the second end of the first transistor is electrically connected to the power module and the discharge module;

[0017] The second end of the first transistor is electrically connected to the first end of the first voltage-dividing resistor; the second end of the first voltage-dividing resistor is electrically connected to the first end of the second voltage-dividing resistor; the second end of the second voltage-dividing resistor is electrically connected to the second end of the second transistor; the second end of the first voltage-dividing resistor is electrically connected to the second end of the second switch button; the control end of the first transistor is electrically connected to the first end of the second transistor; the second end of the second transistor is electrically connected to the second end of the second voltage-dividing resistor and is grounded.

[0018] Optionally, the switch control module further includes: a first unidirectional diode;

[0019] The second end of the first transistor is electrically connected to the first end of the first unidirectional diode; the second end of the first unidirectional diode is electrically connected to the power module and the discharge module.

[0020] Optionally, the switch control module further includes: a third resistor, a first filter capacitor and a first filter resistor;

[0021] The first end of the third resistor is electrically connected to the second end of the second switch button; the second end of the third resistor is electrically connected to the first end of the first filter capacitor; the second end of the first filter capacitor is electrically connected to the second end of the second voltage-dividing resistor and the first end of the first filter resistor and is grounded; the first end of the first filter resistor is electrically connected to the second end of the second transistor.

[0022] Optionally, the power switch control unit includes: a third transistor, a fourth resistor, a fifth resistor and a second filter capacitor;

[0023] The first end of the fourth resistor is electrically connected to the switch control module; the second end of the fourth resistor is electrically connected to the control end of the third transistor; the first end of the third transistor is electrically connected to the first end of the fifth resistor; the second end of the fifth resistor is electrically connected to the voltage source;

[0024] The second end of the third transistor is electrically connected to the second end of the second filter capacitor and is grounded; the first end of the second filter capacitor is electrically connected to the control end of the third transistor.

[0025] Optionally, the power isolation unit includes: a second unidirectional diode and a first relay;

[0026] The first end of the second unidirectional diode is electrically connected to the first end of the third transistor and the eighth end of the first relay; the second end of the second unidirectional diode is electrically connected to the voltage source and the first end of the first relay;

[0027] The second end of the first relay is suspended; the third end of the first relay and the fourth end of the first relay are electrically connected to the power source body.

[0028] Optionally, the discharge switch control unit includes: a sixth resistor, a seventh resistor, a fourth transistor, a fifth transistor, a second filter resistor, a third filter capacitor and a fourth filter capacitor;

[0029] The first end of the sixth resistor is electrically connected to the switch control module; the second end of the sixth resistor is electrically connected to the control end of the fourth transistor and the first end of the third filter capacitor; the second end of the fourth transistor is electrically connected to the second end of the third filter capacitor and is grounded; the first end of the fourth transistor is electrically connected to the first end of the seventh resistor; the second end of the seventh resistor is electrically connected to the control end of the fifth transistor and the first end of the fourth filter capacitor and the first end of the second filter resistor; the second end of the fourth filter capacitor is electrically connected to the first end of the fifth transistor; the second end of the second filter resistor is electrically connected to the voltage source; the second end of the fifth transistor is electrically connected to the discharge isolation unit.

[0030] Optionally, the discharge isolation unit includes: a third unidirectional diode and a second relay; the discharge unit includes a discharge resistor and a light emitting diode;

[0031] The first end of the third unidirectional diode is electrically connected to the second end of the fifth transistor and the eighth end of the second relay; the second end of the third unidirectional diode is electrically connected to the ground end and the first end of the second relay;

[0032] The second end of the second relay is suspended; the third end of the second relay is electrically connected to the power module; the fourth end of the second relay is electrically connected to the first end of the discharge resistor; the second end of the discharge resistor is electrically connected to the first end of the light-emitting diode and is grounded; the second end of the light-emitting diode is electrically connected to the first end of the discharge resistor.

[0033] In an embodiment of the utility model, the switch control module outputs a first control signal to the power module and the discharge module according to a first control instruction; under the first control signal, the power module starts working and the discharge module stops discharging; the switch control module also outputs a second control signal to the power module and the discharge module according to a second control instruction; under the second control signal, the power module stops working and the discharge module starts discharging, so that the power module discharges through the discharge module, thereby ensuring that the low-voltage switch control module controls the normal and stable operation of the high-voltage power module and controls the reliable operation of the discharge module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a switch control circuit provided by an embodiment of the utility model;

[0035] Figure 2 It is a structural schematic diagram of another switch control circuit provided by an embodiment of the utility model;

[0036] Figure 3 It is a specific circuit structure diagram of a switch control circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] Figure 1 is a schematic diagram of a switch control circuit provided by an embodiment of the utility model, such as Figure 1As shown, the circuit includes: a switch control module 10, a power module 20 and a discharge module 30; the switch control module 10 is electrically connected to the power module 20 and the discharge module 30, and is used to output a first control signal to the power module 20 and the discharge module 30 according to a first control instruction; and output a second control signal to the power module 20 and the discharge module 30 according to a second control instruction; the power module 20 is used to start working under the first control signal; and is also used to disconnect working under the second control signal;

[0039] The power module 20 is electrically connected to the discharge module 30; the discharge module 30 is used to stop discharging under a first control signal so that the power module 20 stops discharging through the discharge module 30; and is also used to start discharging under a second control signal so that the power module 20 discharges through the discharge module 30.

[0040] The switch control module 10 may be composed of transistors and / or triodes; it may control the power module 20 to start or shut down, and control the discharge module 30 to start or shut down;

[0041] The power module 20 is a high-voltage power module, which can provide power signals for electronic devices or electronic components; the discharge module 30 is used to quickly discharge the power signal of the power module 20; illustratively, the discharge module 30 may include a discharge capacitor, a discharge resistor, etc.;

[0042] The first control instruction may be a key instruction of the user, or a remote control instruction; the switch control module 10 will output a first control signal under the first control instruction, and under the action of the first control signal, the power module 20 starts, and the discharge module 30 stops discharging;

[0043] The second control instruction may be a key instruction of the user, or a remote control instruction; the switch control module 10 will output a second control signal under the second control instruction, under the action of the second control signal, the power module 20 is not started, and the discharge module 30 starts to work to release the electric energy output by the power module 20 through the discharge module 30;

[0044] In this embodiment, the power supply module 20 is started or shut down by the switch control module 10, and the discharge module 30 is controlled to be shut down when the power supply module 20 is started, and the discharge module 30 is controlled to discharge when the power supply module 20 is not started, thereby ensuring the normal, stable and reliable operation of the high-voltage power supply module.

[0045] Optionally, on the basis of the above embodiment, each power module 20 and the discharge module 30 are further refined. Figure 2 is a schematic diagram of the structure of another switch control circuit provided by an embodiment of the utility model; Figure 2As shown, the power module 20 includes a power switch control unit 21, a power isolation unit 22 and a power body 23; the power switch control unit 21 is electrically connected to the switch control module 10, and is used to generate a first switch action signal to the power isolation unit 22 according to a first control signal; and is used to generate a second switch action signal to the power isolation unit 22 according to a second control signal; the power isolation unit 22 is used to control the power body 23 to start according to the first switch action signal; and the power isolation unit 22 is used to control the power body 23 to disconnect according to the second switch action signal.

[0046] Among them, the power switch control unit 21 is a low-voltage power switch control unit composed of transistors and / or triodes; the power isolation unit 22 can play the role of electrically isolating the low-voltage power switch control unit and the high-voltage power supply body 23; the power isolation unit 22 can include switch relays, optocoupler isolation and the like; in this embodiment, the power switch control unit 21 specifically generates different switch action signals according to different control signals, and outputs different switch action signals to the power isolation unit 22, and the power isolation unit 22 controls the power supply body 23 to start or disconnect according to different switch action signals, thereby further ensuring the normal, stable and reliable operation of the power supply body 23 through the power isolation unit 22.

[0047] Optional, continue to refer to Figure 2 The discharge module 30 includes a discharge switch control unit 31, a discharge isolation unit 32 and a discharge unit 33; the discharge switch control unit 31 is electrically connected to the switch control module 10, and is used to generate a third switch action signal to the discharge isolation unit 32 according to the first control signal; the discharge isolation unit 32 is used to control the discharge unit 33 to stop discharging according to the third switch action signal so that the power supply body 23 does not discharge through the discharge unit 33; and is also used to generate a fourth switch action signal to the discharge isolation unit 32 according to the second control signal; the discharge isolation unit 32 is used to control the discharge unit 33 to start discharging according to the fourth switch action signal so that the power supply body 23 discharges through the discharge unit 33.

[0048] Among them, the discharge switch control unit 31 is a low-voltage discharge control unit composed of transistors and / or triodes; the discharge isolation unit 32 can electrically isolate the low-voltage discharge control unit and the discharge unit 33; the discharge isolation unit 33 can include switch relays, optocoupler isolation and the like; in this embodiment, the discharge switch control unit 31 generates different switch action signals according to different control signals, and outputs different switch action signals to the discharge isolation unit 32, and the discharge isolation unit 32 controls the start or disconnection of the discharge unit 33 according to different switch action signals, so that when the power supply body 23 is controlled to start or shut down, the start or disconnection of the discharge unit 33 is also controlled, and when the power supply body 23 is started, the discharge unit 33 is disconnected; the power supply body 23 works and the discharge unit 33 is started, so that the reliable operation of the control power supply body 23 is further ensured.

[0049] The following is a specific circuit diagram for explanation; Figure 3 is a specific circuit diagram of a switch control circuit provided by an embodiment of the utility model; Figure 3 As shown, in some embodiments, the switch control module 10 includes: a first switch button K1, a second switch button K2, a first resistor R1, a second resistor R2, a first transistor Q1, a first voltage-dividing resistor R11, a second voltage-dividing resistor R12 and a second transistor Q2;

[0050] The first end of the first switch button K1 is electrically connected to the first end of the first resistor R1 and the first end of the second switch button K2; the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and is electrically connected to the voltage source VCC; the second end of the second resistor R2 is electrically connected to the second end of the first switch button K1;

[0051] The second end of the first resistor R1 is electrically connected to the first end of the first transistor Q1; the control end of the first transistor Q1 is electrically connected to the second end of the second resistor R2; the second end of the first transistor Q1 is electrically connected to the power module 20 and the discharge module 30;

[0052] The second end of the first transistor Q1 is electrically connected to the first end of the first voltage-dividing resistor R11; the second end of the first voltage-dividing resistor R11 is electrically connected to the first end of the second voltage-dividing resistor R12; the second end of the second voltage-dividing resistor R12 is electrically connected to the second end of the second transistor Q2; the second end of the first voltage-dividing resistor R11 is electrically connected to the second end of the second switch button K2; the control end of the first transistor Q1 is electrically connected to the first end of the second transistor Q2; the second end of the second transistor Q2 is electrically connected to the second end of the second voltage-dividing resistor R12 and is grounded.

[0053] In this embodiment, the first transistor Q1 is a P-type transistor; the second transistor Q2 is an N-type transistor; specifically, when the first switch button K1 and the second switch button K2 are not pressed, the base level of the first transistor Q1 is high, and the first transistor Q1 is disconnected; the base level of the second transistor Q2 is low, and the second transistor Q2 is disconnected; the second end of the first transistor Q1 is the output end of the switch control module 10, and the control signal outputted from the output end of the switch control module 10 is low;

[0054] Or when the first switch button K1 is pressed and the second switch button K2 is not pressed, the base level of the first transistor Q1 is high level, and the first transistor Q1 is disconnected; the base level of the second transistor Q2 is low level, and the second transistor Q2 is disconnected; the second end of the first transistor Q1 is the output end of the switch control module 10, and the control signal outputted from the output end of the switch control module 10 is low level;

[0055] When the second switch button K2 is pressed and the first switch button K1 is not pressed, the base voltage of the second transistor Q2 is high and the second transistor Q2 is turned on; since the second transistor Q2 is turned on, the base voltage of the first transistor Q1 is pulled down, the base voltage of the first transistor Q1 is low and the first transistor Q1 is turned on (when the first transistor Q1 is turned on, the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 ensure that the second transistor Q2 is always in the on state), then the control signal outputted from the output end of the switch control module 10 is high;

[0056] Optional, continue to refer to Figure 3 In some embodiments, the switch control module 10 further includes: a first unidirectional diode D1; a second end of the first transistor Q1 is electrically connected to a first end of the first unidirectional diode D1; and a second end of the first unidirectional diode D1 is electrically connected to the power module 20 and the discharge module 30.

[0057] The switch control module 10 further includes a first unidirectional diode D1, and the output end of the first unidirectional diode D1 serves as the output end of the switch control module 10. Thus, when the first switch button K1 and the second switch button K2 are not pressed, or when the first switch button K1 is pressed and the second switch button K2 is not pressed, the output ends of the first unidirectional diode D1 are both at a low level, and the control signal output from the output end of the switch control module 10 is at a low level; when the second switch button K2 is pressed and the first switch button K1 is not pressed, the output ends of the first unidirectional diode D1 are both at a high level, and the control signal output from the output end of the switch control module 10 is at a high level; in this embodiment, the first unidirectional diode D1 is added, and the first unidirectional diode D1 can also play a role of electrical isolation without affecting the output of different control signals by the switch control module 10.

[0058] Optional, continue to refer to Figure 3 , the switch control module 10 also includes: a third resistor R3, a first filter capacitor C1 and a first filter resistor R21; the first end of the third resistor R3 is electrically connected to the second end of the second switch button K2; the second end of the third resistor R3 is electrically connected to the first end of the first filter capacitor C1; the second end of the first filter capacitor C1 is electrically connected to the second end of the second voltage-dividing resistor R12 and the first end of the first filter resistor R21 and is grounded; the first end of the first filter resistor R21 is electrically connected to the second end of the second transistor Q2. Among them, the third resistor R3 plays a role in current limiting; the first filter capacitor C1 and the first filter resistor R21 both play a role in filtering.

[0059] Optional, continue to refer to Figure 3 The power switch control unit 21 includes: a third transistor Q3, a fourth resistor R4, a fifth resistor R5 and a second filter capacitor C2; the first end of the fourth resistor R4 is electrically connected to the switch control module 10, that is, electrically connected to the second end of the first unidirectional diode D1; the second end of the fourth resistor R4 is electrically connected to the control end of the third transistor Q3; the first end of the third transistor Q3 is electrically connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is electrically connected to the voltage source VCC; the second end of the third transistor Q3 is electrically connected to the second end of the second filter capacitor C2 and is grounded; the first end of the second filter capacitor C2 is electrically connected to the control end of the third transistor Q3.

[0060] Optional, continue to refer to Figure 3 The power isolation unit 22 includes: a second unidirectional diode D2 and a first relay RY1; the first end of the second unidirectional diode D2 is electrically connected to the first end of the third transistor Q3 and the eighth end of the first relay YR1; the second end of the second unidirectional diode D2 is electrically connected to the voltage source VCC and the first end of the first relay YR1; the second end of the first relay YR1 is suspended; the third end of the first relay YR1 and the fourth end of the first relay YR1 are electrically connected to the power body 23.

[0061] Specifically, when the control signal output from the output end of the switch control module 10 is at a high level, that is, the output end of the first unidirectional diode D1 is at a high level, the third transistor Q3 is turned on, the eighth end of the first relay YR1 is grounded, the third end of the first relay YR1 and the fourth end of the first relay YR1 are connected, and the power supply body 23 is started; when the control signal output from the output end of the switch control module 10 is at a low level, that is, the output end of the first unidirectional diode D1 is at a low level, the third transistor Q3 is disconnected, the eighth end of the first relay YR1 is connected to the voltage source through the fifth resistor R5, the third end of the first relay YR1 and the second end of the first relay YR1 are connected, the third end of the first relay YR1 and the second end of the first relay YR1 are not connected, and the power supply body 23 is not started; wherein, the first relay RY1 plays a role of electrical isolation; the fourth resistor R4 plays a role of current limiting; the fifth resistor R5 plays a role of voltage dividing.

[0062] Optional, continue to refer to Figure 3 The discharge switch control unit 31 includes: a sixth resistor R6, a seventh resistor R7, a fourth transistor Q4, a fifth transistor Q5, a second filter resistor R22, a third filter capacitor C3 and a fourth filter capacitor C4; the first end of the sixth resistor R6 is electrically connected to the switch control module 10, that is, electrically connected to the second end of the first unidirectional diode D1; the second end of the sixth resistor R6 is electrically connected to the control end of the fourth transistor Q4 and the first end of the third filter capacitor C3; the second end of the fourth transistor Q4 is electrically connected to the second end of the third filter capacitor C3 and is grounded; the first end of the fourth transistor Q4 is electrically connected to the first end of the seventh resistor R7; the second end of the seventh resistor R7 is electrically connected to the control end of the fifth transistor Q5 and the first end of the fourth filter capacitor C4 and the first end of the second filter resistor R22; the second end of the fourth filter capacitor C4 is electrically connected to the first end of the fifth transistor Q5; the second end of the second filter resistor R22 is electrically connected to the voltage source VCC; the second end of the fifth transistor Q5 is electrically connected to the discharge isolation unit 22.

[0063] Optional, continue to refer to Figure 3 The discharge isolation unit 32 includes: a third unidirectional diode D3 and a second relay YR2; the discharge unit 23 includes a discharge resistor R and a light-emitting diode VD1; the first end of the third unidirectional diode D3 is electrically connected to the second end of the fifth transistor Q5 and the eighth end of the second relay YR2; the second end of the third unidirectional diode D3 is electrically connected to the ground end and the first end of the second relay YR2; the second end of the second relay YR2 is suspended; the third end of the second relay YR2 is electrically connected to the power supply body 23; the fourth end of the second relay YR2 is electrically connected to the first end of the discharge resistor R; the second end of the discharge resistor R is electrically connected to the first end of the light-emitting diode VD1 and is grounded; the second end of the light-emitting diode VD1 is electrically connected to the first end of the discharge resistor R.

[0064] Specifically, when the control signal output from the output end of the switch control module 10 is at a high level, that is, the output end of the first unidirectional diode D1 is at a high level, the fourth transistor Q4 is turned on, the base level of the fifth transistor Q5 is pulled down, the fifth transistor Q5 is turned off, the eighth end of the second relay YR2 is grounded, the third end of the second relay YR2 and the second end of the second relay YR2 are connected, the third end of the second relay YR2 and the fourth end of the second relay YR2 are disconnected, and the discharge resistor R and the light-emitting diode VD1 are disconnected; when the control signal output from the output end of the switch control module 10 is When the output end of the first unidirectional diode D1 is at a low level, the fourth transistor Q4 is disconnected, the base of the fifth transistor Q5 is at a high level, the fifth transistor Q5 is turned on, the eighth end of the second relay YR2 is connected to the voltage source through the third unidirectional diode D3, the third end of the second relay YR2 and the second end of the second relay YR2 are disconnected, and the third end of the second relay YR2 and the fourth end of the second relay YR2 are connected, the discharge resistor R and the light-emitting diode VD1 work, so that the power supply body 23 releases electric energy through the discharge resistor R, and the light-emitting diode VD1 emits light. Among them, the second relay RY2 plays the role of electrical isolation; the sixth resistor R6 and the seventh resistor R7 play the role of current limiting; the second filter resistor R22, the third filter capacitor C3 and the fourth filter capacitor C4 all play the role of filtering.

[0065] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A switch control circuit, characterized in that: include: Switch control module, power module and discharge module; The switch control module is electrically connected to the power module and the discharge module, and is used to output a first control signal to the power module and the discharge module according to a first control instruction; and output a second control signal to the power module and the discharge module according to a second control instruction; The power supply module is used to start working under the first control signal and stop working under the second control signal; The power module is electrically connected to the discharge module; the discharge module is used to stop discharging under the first control signal; and start discharging under the second control signal so that the power module discharges through the discharge module.

2. The switch control circuit according to claim 1, characterized in that: The power module includes a power switch control unit, a power isolation unit and a power body; The power switch control unit is electrically connected to the switch control unit and is used to generate a first switch action signal to the power isolation unit according to a first control signal; Used to generate a second switch action signal to the power isolation unit according to a second control signal; The power isolation unit is used to control the power supply body to start up according to the first switch action signal; and is also used to control the power supply body to disconnect according to the second switch action signal.

3. The switch control circuit according to claim 1, characterized in that: The discharge module includes a discharge switch control unit, a discharge isolation unit and a discharge unit; The discharge switch control unit is electrically connected to the switch control module, and is used to generate a third switch action signal to the discharge isolation unit according to the first control signal; the discharge isolation unit is used to control the discharge unit to stop discharging according to the second switch action signal; The discharge switch control unit is further used to generate a fourth switch action signal to the discharge isolation unit according to the second control signal; the discharge isolation unit is used to control the discharge start of the discharge unit according to the fourth switch action signal.

4. The switch control circuit according to claim 1, characterized in that: The switch control module includes: a first switch button, a second switch button, a first resistor, a second resistor, a first transistor, a first voltage-dividing resistor, a second voltage-dividing resistor and a second transistor; The first end of the first switch button is electrically connected to the first end of the first resistor and the first end of the second switch button; the second end of the first resistor is electrically connected to the first end of the second resistor and to a voltage source; the second end of the second resistor is electrically connected to the second end of the first switch button; The second end of the first resistor is electrically connected to the first end of the first transistor; the control end of the first transistor is electrically connected to the second end of the second resistor; the second end of the first transistor is electrically connected to the power module and the discharge module; The second end of the first transistor is electrically connected to the first end of the first voltage-dividing resistor; the second end of the first voltage-dividing resistor is electrically connected to the first end of the second voltage-dividing resistor; the second end of the second voltage-dividing resistor is electrically connected to the second end of the second transistor; the second end of the first voltage-dividing resistor is electrically connected to the second end of the second switch button; the control end of the first transistor is electrically connected to the first end of the second transistor; the second end of the second transistor is electrically connected to the second end of the second voltage-dividing resistor and is grounded.

5. The switch control circuit according to claim 4, characterized in that: The switch control module further includes: a first unidirectional diode; The second end of the first transistor is electrically connected to the first end of the first unidirectional diode; the second end of the first unidirectional diode is electrically connected to the power module and the discharge module.

6. The switch control circuit according to claim 5, characterized in that: The switch control module further includes: a third resistor, a first filter capacitor and a first filter resistor; The first end of the third resistor is electrically connected to the second end of the second switch button; the second end of the third resistor is electrically connected to the first end of the first filter capacitor; the second end of the first filter capacitor is electrically connected to the second end of the second voltage-dividing resistor and the first end of the first filter resistor and is grounded; the first end of the first filter resistor is electrically connected to the second end of the second transistor.

7. The switch control circuit according to claim 2, characterized in that: The power switch control unit includes: a third transistor, a fourth resistor, a fifth resistor and a second filter capacitor; The first end of the fourth resistor is electrically connected to the switch control module; the second end of the fourth resistor is electrically connected to the control end of the third transistor; the first end of the third transistor is electrically connected to the first end of the fifth resistor; the second end of the fifth resistor is electrically connected to the voltage source; The second end of the third transistor is electrically connected to the second end of the second filter capacitor and is grounded; the first end of the second filter capacitor is electrically connected to the control end of the third transistor.

8. The switch control circuit according to claim 7, characterized in that: The power isolation unit includes: a second unidirectional diode and a first relay; The first end of the second unidirectional diode is electrically connected to the first end of the third transistor and the eighth end of the first relay; the second end of the second unidirectional diode is electrically connected to the voltage source and the first end of the first relay; The second end of the first relay is suspended; the third end of the first relay and the fourth end of the first relay are electrically connected to the power source body.

9. The switch control circuit according to claim 3, characterized in that: The discharge switch control unit includes: a sixth resistor, a seventh resistor, a fourth transistor, a fifth transistor, a second filter resistor, a third filter capacitor and a fourth filter capacitor; The first end of the sixth resistor is electrically connected to the switch control module; the second end of the sixth resistor is electrically connected to the control end of the fourth transistor and the first end of the third filter capacitor; the second end of the fourth transistor is electrically connected to the second end of the third filter capacitor and is grounded; the first end of the fourth transistor is electrically connected to the first end of the seventh resistor; the second end of the seventh resistor is electrically connected to the control end of the fifth transistor and the first end of the fourth filter capacitor and the first end of the second filter resistor; the second end of the fourth filter capacitor is electrically connected to the first end of the fifth transistor; the second end of the second filter resistor is electrically connected to the voltage source; and the second end of the fifth transistor is electrically connected to the discharge isolation unit.

10. The switch control circuit according to claim 9, characterized in that: The discharge isolation unit includes: a third unidirectional diode and a second relay; the discharge unit includes a discharge resistor and a light emitting diode; The first end of the third unidirectional diode is electrically connected to the second end of the fifth transistor and the eighth end of the second relay; the second end of the third unidirectional diode is electrically connected to the ground end and the first end of the second relay; The second end of the second relay is suspended; the third end of the second relay is electrically connected to the power module; the fourth end of the second relay is electrically connected to the first end of the discharge resistor; the second end of the discharge resistor is electrically connected to the first end of the light-emitting diode and is grounded; the second end of the light-emitting diode is electrically connected to the first end of the discharge resistor.

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