A high-voltage capacitor charging input port switch circuit and charging device

Abstract

The embodiment of the present application relates to the technical field of transcranial magnetic stimulators, and discloses a high-voltage capacitor charging input port switch circuit and a charging device. The switch circuit includes a pre-charging module, a conduction control module, a disconnection control module and a main switch module. The input end of the pre-charging module is connected to the power output end, the input end of the conduction control module is connected to the output end of the pre-charging module, the input end of the disconnection control module is connected to the output end of the pre-charging module, the control input end of the main switch module is connected to the output end of the conduction control module, the power input end of the main switch module is connected to the power output end, and the output end of the main switch module is connected to the capacitor to be charged. The high-voltage capacitor charging input port switch circuit provided in the embodiment of the present application simplifies the type and number of components in the circuit, is conducive to the miniaturization of the system, and also reduces costs; at the same time, the switch circuit reduces the power loss of the main switch auxiliary circuit, which is conducive to improving the energy efficiency of the system.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of transcranial magnetic stimulators, and in particular to a high-voltage capacitor charging input port switch circuit and a charging device. Background Art

[0002] In certain high-voltage capacitor applications, to prevent the downstream load from being affected by the upstream charging power supply circuit during the high-voltage capacitor's discharge process, a switch is often added between the charging power supply and the high-voltage capacitor to isolate the load from the charging power supply circuit. This switch is turned on when the high-voltage capacitor needs to be charged; it is turned off when the high-voltage capacitor is fully charged. For example, in a transcranial magnetic stimulation device, the downstream load of the high-voltage capacitor is the magnetic stimulation coil. When the high-voltage capacitor discharges, the high-voltage capacitor and the magnetic stimulation coil resonate, causing the capacitor's voltage polarity to briefly reverse. If there is no disconnected switch at the high-voltage capacitor charging port, the reversed voltage polarity of the high-voltage capacitor will short-circuit through the charging power supply's rectifier circuit.

[0003] Adding a switch between the charging power source and the high-voltage capacitor requires a supporting circuit to ensure that the switch can be reliably opened and closed according to a specific timing. However, existing switch supporting circuits are often complex and have the disadvantages of being bulky, having many components, high cost, high power consumption, and low energy efficiency. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a high-voltage capacitor charging input port switching circuit and a charging device to simplify the switching circuit, reduce costs, and improve the energy efficiency of the system.

[0005] In order to solve the above technical problems, an embodiment of the present application provides a high-voltage capacitor charging input port switching circuit, including: a pre-charging module, a conduction control module, a disconnection control module and a main switch module, the input end of the pre-charging module is connected to the power supply output end, the input end of the conduction control module is connected to the output end of the pre-charging module, the input end of the disconnection control module is connected to the output end of the pre-charging module, the control input end of the main switch module is connected to the output end of the conduction control module, the power input end of the main switch module is connected to the power supply output end, and the output end of the main switch module is connected to the capacitor to be charged.

[0006] In addition, the pre-charging module includes a diode D1, a resistor R5 and a capacitor C2. The positive electrode of the diode D1 is connected to the power output end, the negative electrode of the diode is connected to one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output end of the main switch module; the connection point of the resistor R5 and the capacitor C2 is also connected to the input end of the conduction control module.

[0007] In addition, the main switch module includes a main switch Q and a clamping circuit for clamping the gate voltage of the main switch Q.

[0008] In addition, the clamping circuit includes a capacitor C3, a diode D3 and a resistor R8, and the capacitor C3, the diode D3 and the resistor R8 are all connected in parallel at both ends of the main switch Q.

[0009] In addition, the main switch Q is an N-channel electronic switch.

[0010] In addition, the conduction control module includes a switch Q3, a diode D2 and a resistor R6. The diode D2 and the resistor R6 are both arranged in parallel at both ends of the switch Q3; the resistor R6 is also connected to the power output end of the main switch module through a resistor R7.

[0011] In addition, the diode D2 and / or the diode D3 are voltage stabilizing diodes.

[0012] In addition, the disconnection control module includes a capacitor C1, a transistor Q1 and a transistor Q2, the base and emitter of the transistor Q1 are respectively connected to the two ends of the capacitor C1, and the base of the transistor Q1 is connected to one end of the capacitor C2 through the resistor R1; the collector of the transistor Q1 is connected to one end of the capacitor C2 through the resistor R2, and the collector of the transistor Q1 is also connected to the base of the transistor Q2 through the resistor R3; the emitter of the transistor Q1 is connected to the other end of the capacitor C2; the collector of the transistor Q2 is connected to the other end of the capacitor C2 through the resistor R4, and the collector of the transistor Q2 is also connected to the base of the transistor Q1; the emitter of the transistor Q2 is connected to one end of the capacitor C2.

[0013] In addition, the transistor Q1 is an NPN transistor, and the transistor Q2 is a PNP transistor.

[0014] An embodiment of the present application further provides a charging device, including a charging power supply and the above-mentioned high-voltage capacitor charging input port switching circuit.

[0015] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0016] The embodiments of the present application simplify the existing switch circuit, eliminating the control circuit module and isolation circuit module in the existing switch circuit. Only the drive circuit module is required to autonomously and reliably control the on and off of the switch. The switch circuit of the embodiments of the present application does not require a separate control circuit. The main switch automatically turns on as the power supply output voltage rises and automatically turns off after the power supply is turned off. The switch circuit of the embodiments of the present application also does not require a separate isolation circuit. Because there are no control signals transmitted from the microcontroller, a signal isolation transmission circuit is not required. Because the power required for the main switch drive circuit is derived from the energy output by the power supply to the pre-charge capacitor, an isolated power supply is not required.

[0017] The switch circuit of the embodiment of the present application includes a pre-charging module, a conduction control module, a disconnection control module and a main switch module. The pre-charging module is a pre-charging circuit. Before the main switch reaches the opening condition, the pre-charging capacitor in the pre-charging circuit will be charged first. After the pre-charging capacitor is fully charged, it will be used as the driving power supply of the main switch. The conduction control module is the opening control circuit of the main switch. When the voltage of the pre-charging capacitor reaches a certain threshold, the pre-charging capacitor will be connected to the gate of the main switch, thereby realizing the opening of the main switch. The disconnection control module is the disconnection control circuit of the main switch. The disconnection delay time can be set to the time when the capacitor to be charged is fully charged. When the delay time ends, the charge of the pre-charging capacitor will be quickly discharged, thereby disconnecting the main switch.

[0018] The switching circuit of the embodiment of the present application simplifies the type and number of components in the circuit, reducing costs; at the same time, the circuit reduces the volume of the main switch auxiliary circuit, which is conducive to the miniaturization of the system; the circuit also reduces the power loss of the main switch auxiliary circuit, which is conducive to improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments.

[0020] Figure 1 This is a module diagram of a high-voltage capacitor charging input port switch circuit provided by the related art;

[0021] Figure 2 This is a module diagram of a high-voltage capacitor charging input port switch circuit provided by an embodiment of the present application;

[0022] Figure 3 This is a module diagram of a high-voltage capacitor charging input port switch circuit provided by another embodiment of the present application;

[0023] Figure 4 This is a circuit diagram of a high-voltage capacitor charging input port switch circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] As can be seen from the background art, the supporting circuits of existing switches are usually relatively complex and have the disadvantages of being large in size, having many components, high cost, high power consumption, and low energy efficiency.

[0025] Analysis has found that the reason why existing switching circuits have the above-mentioned shortcomings is that in order to ensure that the switch can be reliably turned on and off according to a certain timing, the switching circuit usually requires a matching auxiliary circuit to ensure this function.

[0026] This switching circuit is primarily used in applications using high-voltage capacitors, such as the boost circuit of a transcranial magnetic stimulation device. To prevent the downstream load from being affected by the upstream charging power supply circuit during the high-voltage capacitor's discharge, a switch is added between the charging power supply and the high-voltage capacitor to isolate the load from the charging power supply circuit. This switch is turned on when the high-voltage capacitor needs to be charged; it is turned off when the high-voltage capacitor is fully charged. For example, in a transcranial magnetic stimulation device, this switch is often added to the boost circuit to prevent a short circuit caused by a voltage polarity reversal in the energy storage capacitor during stimulation. The downstream load of the high-voltage capacitor in a transcranial magnetic stimulation device is the magnetic stimulation coil. When the high-voltage capacitor discharges, it resonates with the magnetic stimulation coil, causing the capacitor's voltage polarity to briefly reverse. Without a disconnected switch at the high-voltage capacitor charging port, the reversed voltage on the high-voltage capacitor would short-circuit through the charging power supply's rectifier circuit.

[0027] The aforementioned switch requires a supporting circuit to ensure it opens and closes reliably according to a specific timing sequence. Existing technical solutions often require complex, bulky, component-heavy, costly, and power-hungry supporting circuits. The present embodiment aims to eliminate the control circuit module and isolation circuit module from existing switch supporting circuit solutions, allowing only the driver circuit module to autonomously and reliably control the on and off of the switch.

[0028] See also Figure 1 , the related technology provides a high-voltage capacitor charging input port switching circuit. Figure 1 C is the capacitor to be charged, and here, the capacitor to be charged can be a high-voltage capacitor; Figure 1 Q in the figure is a switch, and its auxiliary circuits include a drive circuit, an isolation circuit, and a control circuit. The output of the control circuit is connected to the input of the isolation circuit. The control circuit is used to generate the pulse signal required to turn switch Q on or off, and it is a low-voltage circuit. The output of the isolation circuit is connected to the input of the drive circuit. The isolation circuit is used to isolate the low-voltage circuit (control circuit) from the high-voltage circuit and transmit signals losslessly between the low-voltage circuit and the high-voltage circuit. The output of the drive circuit is connected to switch Q, and the drive circuit is used to amplify the control signal of switch Q so that switch Q can be fully turned on or off.

[0029] In order to simplify the switch circuit in the related art, the embodiment of the present application eliminates the control circuit and isolation circuit in the related art and proposes a simplified switch circuit. Figure 2 , is a simplified module diagram of the switch circuit according to the embodiment of the present application. Figure 2 As shown, the switch circuit of the embodiment of the present application eliminates the control circuit and the isolation circuit. Only the drive circuit is connected to the switch Q, and the on and off of the switch Q is controlled by the drive circuit.

[0030] See also Figure 3 , an embodiment of the present application provides a high-voltage capacitor charging input port switch circuit, including: a pre-charging module 101, a conduction control module 102, a disconnection control module 103 and a main switch module 104, the input end of the pre-charging module 101 is connected to the power supply output end, the input end of the conduction control module 102 is connected to the output end of the pre-charging module 101, the input end of the disconnection control module 103 is connected to the output end of the pre-charging module 101, the control input end of the main switch module 104 is connected to the output end of the conduction control module 102, the power input end of the main switch module 104 is connected to the power supply output end, and the output end of the main switch module 104 is connected to the capacitor to be charged.

[0031] In order to reduce the area of ​​components and circuit boards in the circuit, the embodiment of the present application simplifies the existing switch circuit and eliminates the control circuit module and isolation circuit module in the existing switch circuit. The switch circuit of the embodiment of the present application only needs the drive circuit module to independently and reliably control the on and off of the switch. Figure 2 As shown, the switch circuit of the embodiment of the present application does not require a separate control circuit. The main switch Q is automatically turned on during the rising process of the power supply output voltage and can be automatically turned off after the power supply is turned off. The switch circuit of the embodiment of the present application also does not require a separate isolation circuit. Since there is no control signal transmitted from the microcontroller, a signal isolation transmission circuit is not required. Since the power required for the drive circuit of the main switch Q is obtained from the energy output by the power supply to the pre-charge capacitor, an isolated power supply is not required.

[0032] In the switching circuit of the embodiment of the present application, the power supply is a charging power supply with a full-wave rectified output. The pre-charging module 101 is a pre-charging circuit. Before the main switch Q reaches the turn-on condition, the pre-charging capacitor in the pre-charging circuit will be charged first. After the pre-charging capacitor is fully charged, it will be used as the driving power supply for the main switch Q. The conduction control module 102 is the turn-on control circuit of the main switch Q. When the voltage of the pre-charging capacitor reaches a certain threshold, the pre-charging capacitor will be connected to the gate of the main switch Q, thereby realizing the turn-on of the main switch Q. The disconnection control module 103 is the disconnection control circuit of the main switch Q. The disconnection delay time can be set to the time it takes for the charging capacitor to be fully charged. When the delay time ends, the charge of the pre-charging capacitor will be quickly discharged, thereby disconnecting the main switch Q.

[0033] In some embodiments, the pre-charging module 101 includes a diode D1, a resistor R5 and a capacitor C2, the positive electrode of the diode D1 is connected to the power output end, the negative electrode of the diode is connected to one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output end of the main switch module 104; the connection point of the resistor R5 and the capacitor C2 is also connected to the input end of the conduction control module 102.

[0034] See also Figure 4 The pre-charging module 101 is a pre-charging circuit, which includes a diode D1, a resistor R5 and a capacitor C2. The capacitor C2 is a pre-charging capacitor. Before the main switch Q reaches the turn-on condition, the pre-charging capacitor C2 in the pre-charging circuit will be charged first. After the pre-charging capacitor C2 is fully charged, the charging capacitor C2 is used as the driving power supply of the main switch Q to supply power to the main switch Q. A resistor R5 is set between the diode D1 and the pre-charging capacitor C2. The resistor R5 is used to limit the pre-charging current and also prolong the pre-charging time. When the DC+ voltage at the power input terminal lasts for too short a time, the pre-charging capacitor C2 will not complete the pre-charging. When the main switch Q is turned on, the voltage of the pre-charging capacitor C2 will be raised to above Vo. At this time, the voltage across the diode D1 is reverse biased, and the capacitor C2 will not discharge through the diode D1.

[0035] It should be noted that the diode D1 can be a rectifier diode.

[0036] In some embodiments, the main switch module 104 includes a main switch Q and a clamping circuit for clamping the gate voltage of the main switch Q. The clamping circuit is mainly used to clamp the gate voltage of the main switch Q so that it does not exceed a tolerance range.

[0037] In some embodiments, the clamping circuit includes a capacitor C3, a diode D3, and a resistor R8, and the capacitor C3, the diode D3, and the resistor R8 are all connected in parallel at both ends of the main switch Q.

[0038] See also Figure 4 The main switch module 104 includes a main switch Q and a clamping circuit for clamping the gate voltage of the main switch Q. The main switch Q can be an N-channel field-effect transistor. The drain of the main switch Q is connected to the power input terminal, and the source is grounded via a capacitor to be charged. When the gate voltage of the main switch Q is greater than Vg, the main switch Q is turned on.

[0039] In some embodiments, diode D3 can be a Zener diode. The anode of diode D3 is connected to the source of main switch Q, the cathode of diode D3 is connected to the gate of main switch Q, and the drain of main switch Q is connected to the power input. Diode D3 is used to clamp the gate voltage of main switch Q so that it does not exceed the maximum limit. Resistor R8 is connected in parallel across diode D3. Resistor R8 is primarily used to prevent the gate of main switch Q from floating and thus preventing main switch Q from being mis-turned on. Capacitor C3 is also connected in parallel across diode D3. Capacitor C3 is primarily used to stabilize the gate voltage of main switch Q and prevent interference with the gate of main switch Q.

[0040] In some embodiments, the main switch Q is an N-channel electronic switch.

[0041] In some embodiments, the main switch Q may be an N-channel Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), which may also be referred to as MOSFET.

[0042] In some other embodiments, the main switch Q may also be an insulated gate bipolar transistor (IGBT), which has the advantages of both the high input impedance of a MOSFET and the low on-state voltage drop of a giant transistor (GTR).

[0043] It should be noted that when the switching circuit provided in the embodiment of the present application is used in the scenario of the boost circuit in the transcranial magnetic stimulation instrument, the main switch Q adopts a low-power IGBT, the capacitor to be charged C is a high-voltage capacitor, and the high-voltage capacitor adopts an energy storage capacitor with a voltage of more than 1000V; when magnetic stimulation occurs, the high-voltage capacitor and the external stimulation coil operate in a resonant state. In this way, the transcranial magnetic stimulation instrument can output bidirectional stimulation pulses and recover the residual energy of the coil; and the switching circuit of the embodiment of the present application has a simple circuit structure, which greatly reduces the area of ​​components and circuit boards in the circuit and reduces costs; at the same time, the switching circuit of the embodiment of the present application reduces the volume of the main switch auxiliary circuit, which is conducive to the miniaturization of the system and is suitable for compact magnetic stimulation instruments.

[0044] In some embodiments, the conduction control module 102 includes a switch Q3, a diode D2 and a resistor R6. The diode D2 and the resistor R6 are both connected in parallel at both ends of the switch Q3. The resistor R6 is also connected to the power output end of the main switch module 104 through a resistor R7.

[0045] See also Figure 4 The conduction control module 102 serves as the main switch conduction control circuit. Only when the voltage of the pre-charge capacitor C2 in the pre-charge module 101 reaches a certain threshold will the pre-charge capacitor C2 be connected to the gate of the main switch Q, thereby turning on the main switch Q. The conduction control module 102 is primarily used to control the conduction of the main switch Q. Resistors R6 and R7 are used to set the conduction threshold for switch Q3. Switch Q3 is not turned on until capacitor C2 in the pre-charge module 101 is charged to a sufficiently high voltage (e.g., 15V). This ensures that the main switch Q is fully saturated and conductive when it turns on.

[0046] In some embodiments, the switch Q3 can be a P-channel electronic switch. Figure 4 As shown, when the gate voltage Vg1 of switch Q3 is less than a certain value, switch Q3 turns on. The source of switch Q3 is connected to the cathode of diode D3. Resistor R6 is connected in parallel between the drain and gate of switch Q3. Resistor R6 is connected to the anode of diode D3 via resistor R7. Both resistors R6 and R7 are used to set the threshold for switch Q3 to turn on. A diode D2 is also connected in parallel between the drain and gate of switch Q3 to clamp the gate voltage of switch Q3 so that it does not exceed the maximum limit.

[0047] In some embodiments, the diode D2 and / or the diode D3 is a Zener diode.

[0048] In some embodiments, the diode D2 and the diode D3 are voltage-stabilizing diodes, or the diode D2 is a voltage-stabilizing diode or the diode D3 is a voltage-stabilizing diode, which is not limited in the embodiments of the present application.

[0049] In some embodiments, the disconnection control module 103 includes a capacitor C1, a transistor Q1 and a transistor Q2, the base and emitter of the transistor Q1 are respectively connected to the two ends of the capacitor C1, and the base of the transistor Q1 is connected to one end of the capacitor C2 through the resistor R1; the collector of the transistor Q1 is connected to one end of the capacitor C2 through the resistor R2, and the collector of the transistor Q1 is also connected to the base of the transistor Q2 through the resistor R3; the emitter of the transistor Q1 is connected to the other end of the capacitor C2; the collector of the transistor Q2 is connected to the other end of the capacitor C2 through the resistor R4, and the collector of the transistor Q2 is also connected to the base of the transistor Q1; the emitter of the transistor Q2 is connected to one end of the capacitor C2.

[0050] See also Figure 4 The disconnection control module 103 serves as the main switch disconnection control circuit. The disconnection delay time can be set to the time it takes for the pre-charged capacitor C to be fully charged. When the delay time expires, the charge in the pre-charged capacitor C2 is rapidly discharged, thereby disconnecting the main switch Q. Resistor R1, capacitor C1, and resistor R4 in the disconnection control module 103 are used to delay the disconnection of the main switch Q. Capacitor C1 and pre-charged capacitor C2 begin charging at the same time. When the voltage of capacitor C1 reaches the conduction threshold of transistor Q1, transistor Q1 begins to conduct, followed by transistor Q2. Current rapidly charges capacitor C1 through transistor Q2, causing the voltage of capacitor C1 to rise rapidly, causing transistor Q1 to quickly enter a saturated conduction state. This rapidly discharges the charge in pre-charged capacitor C2 through resistor R2 and transistor Q1. When the pre-charged capacitor C2 is discharged to a sufficiently low voltage, the main switch Q is disconnected.

[0051] In some embodiments, the transistor Q1 is an NPN transistor, and the transistor Q2 is a PNP transistor.

[0052] The high-voltage capacitor charging input port switch circuit provided in the embodiment of the present application includes a pre-charging module 101, a conduction control module 102, a disconnection control module 103 and a main switch module 104; the pre-charging module 101 is a pre-charging circuit, and the pre-charging capacitor C2 in the pre-charging module 101 will be used as the driving power supply for the main switch Q after being fully charged. The conduction control module 102 is the opening control circuit of the main switch Q. When the voltage of the pre-charging capacitor reaches a certain threshold, the pre-charging capacitor will be connected to the gate of the main switch Q, thereby realizing the opening of the main switch Q. The disconnection control module 103 is the disconnection control circuit of the main switch Q. When the delay time ends, the charge of the pre-charging capacitor C2 will be quickly discharged, thereby disconnecting the main switch Q. The switching circuit of the embodiment of the present application simplifies the type and number of components in the circuit, reducing costs; at the same time, the circuit reduces the volume of the main switch auxiliary circuit, which is conducive to the miniaturization of the system; the circuit also reduces the power loss of the main switch auxiliary circuit, which is conducive to improving the energy efficiency of the system.

[0053] An embodiment of the present application further provides a charging device, including a charging power supply and the above-mentioned high-voltage capacitor charging input port switching circuit.

[0054] As mentioned above, the high-voltage capacitor charging input port switching circuit described above can be used in the boost circuit of a transcranial magnetic stimulation device. When used in a transcranial magnetic stimulation device, the main switch Q can use a low-power IGBT to prevent the high-voltage capacitor from short-circuiting through the charging power supply's rectifier circuit after the high-voltage capacitor voltage polarity is reversed. This design not only simplifies the driver circuit of the switching circuit, but also significantly reduces the area of ​​auxiliary components and circuit boards, making the device more compact, reducing the size and weight of the device, and facilitating device portability.

[0055] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A high-voltage capacitor charging input port switch circuit, characterized in that: include: A pre-charging module, wherein the input end of the pre-charging module is connected to the output end of the power supply; A conduction control module, wherein an input end of the conduction control module is connected to an output end of the pre-charging module; a disconnection control module, wherein an input end of the disconnection control module is connected to an output end of the pre-charging module; a main switch module, wherein a control input terminal of the main switch module is connected to an output terminal of the conduction control module, a power input terminal of the main switch module is connected to an output terminal of the power supply, and an output terminal of the main switch module is connected to a capacitor to be charged; The pre-charging module includes a diode D1, a resistor R5, and a capacitor C2. The anode of the diode D1 is connected to the power output terminal, the cathode of the diode is connected to one end of the resistor R5, the other end of the resistor R5 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the power output terminal of the main switch module; the connection point between the resistor R5 and the capacitor C2 is also connected to the input terminal of the conduction control module; The disconnection control module includes a capacitor C1, a transistor Q1, and a transistor Q2. The base and emitter of the transistor Q1 are respectively connected to the two ends of the capacitor C1, and the base of the transistor Q1 is connected to one end of the capacitor C2 through a resistor R1; the collector of the transistor Q1 is connected to one end of the capacitor C2 through a resistor R2, and the collector of the transistor Q1 is also connected to the base of the transistor Q2 through a resistor R3; the emitter of the transistor Q1 is connected to the other end of the capacitor C2; The collector of the transistor Q2 is connected to the other end of the capacitor C2 through the resistor R4 and is also connected to the base of the transistor Q1 ; the emitter of the transistor Q2 is connected to one end of the capacitor C2 .

2. The high-voltage capacitor charging input port switch circuit according to claim 1, characterized in that: The main switch module includes a main switch Q and a clamping circuit for clamping the gate voltage of the main switch Q.

3. The high-voltage capacitor charging input port switch circuit according to claim 2, characterized in that: The clamping circuit includes a capacitor C3, a diode D3 and a resistor R8, and the capacitor C3, the diode D3 and the resistor R8 are all connected in parallel at both ends of the main switch Q.

4. The high-voltage capacitor charging input port switch circuit according to claim 2, characterized in that: The main switch Q is an N-channel electronic switch.

5. The high-voltage capacitor charging input port switch circuit according to claim 1, characterized in that: The conduction control module includes a switch Q3, a diode D2 and a resistor R6. The diode D2 and the resistor R6 are both arranged in parallel at both ends of the switch Q3. The resistor R6 is also connected to the power output end of the main switch module through a resistor R7.

6. The high-voltage capacitor charging input port switch circuit according to claim 5, characterized in that: The diode D2 and / or the diode D3 are voltage stabilizing diodes.

7. The high-voltage capacitor charging input port switch circuit according to claim 1, characterized in that: The transistor Q1 is an NPN transistor, and the transistor Q2 is a PNP transistor.

8. A charging device, characterized in that: include: A charging power supply and a high-voltage capacitor charging input port switching circuit according to any one of claims 1 to 7.

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