CN114825512A - High-voltage capacitor charging input port switch circuit and charging device - Google Patents

High-voltage capacitor charging input port switch circuit and charging device Download PDF

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Publication number
CN114825512A
CN114825512A CN202210316359.4A CN202210316359A CN114825512A CN 114825512 A CN114825512 A CN 114825512A CN 202210316359 A CN202210316359 A CN 202210316359A CN 114825512 A CN114825512 A CN 114825512A
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China
Prior art keywords
capacitor
circuit
module
charging
resistor
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CN202210316359.4A
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Chinese (zh)
Inventor
默罕默德·萨万
李宁
杨杰
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Westlake University
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Westlake University
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Priority to CN202210316359.4A priority Critical patent/CN114825512A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the application relates to the technical field of transcranial magnetic stimulation instruments and discloses a high-voltage capacitor charging input port switch circuit and a charging device. The switching circuit comprises a pre-charging module, a conduction control module, a disconnection control module and a main switching module, wherein the input end of the pre-charging module is connected with the output end of a power supply, the input end of the conduction control module is connected with the output end of the pre-charging module, the input end of the disconnection control module is connected with the output end of the pre-charging module, the control input end of the main switching module is connected with the output end of the conduction control module, the power input end of the main switching module is connected with the output end of the power supply, and the output end of the main switching module is connected with a capacitor to be charged. The high-voltage capacitor charging input port switch circuit provided by the embodiment of the application simplifies the types and the number of elements in the circuit, is beneficial to miniaturization of a system and reduces the cost; meanwhile, the switching circuit reduces the power loss of the main switch auxiliary circuit, and is beneficial to improving the energy efficiency of the system.

Description

High-voltage capacitor charging input port switch circuit and charging device
Technical Field
The embodiment of the application relates to the technical field of transcranial magnetic stimulation instruments, in particular to a high-voltage capacitor charging input port switch circuit and a charging device.
Background
In some high-voltage capacitor applications, in order to avoid the influence of the front-stage charging power circuit on the rear-stage load during the discharging operation of the high-voltage capacitor, a switch is usually required to be added between the charging power supply and the high-voltage capacitor to isolate the influence of the charging power circuit on the load. When the high-voltage capacitor needs to be charged, the switch is switched on; after the high-voltage capacitor is charged, the switch is switched off. For example, in a transcranial magnetic stimulation instrument, the rear-stage load of the high-voltage capacitor is a magnetic stimulation coil, when the high-voltage capacitor is discharged to work, the high-voltage capacitor and the magnetic stimulation coil form resonance, and the voltage polarity of the capacitor can be reversed for a short time. If there is no open switch at the charging port of the high-voltage capacitor, the high-voltage capacitor with reversed voltage polarity will cause short circuit through the rectifying circuit of the charging power supply.
The switch is added between the charging power supply and the high-voltage capacitor, and a matched circuit is needed to ensure that the switch can be reliably switched on and off according to a certain time sequence. However, the conventional switch support circuit is generally complex and has the disadvantages of large volume, many elements, high cost, large power consumption and low energy efficiency.
Disclosure of Invention
An object of the embodiment of the application is to provide a high-voltage capacitor charging input port switch circuit and a charging device, which simplify the switch circuit, reduce the cost and improve the energy efficiency of a system.
In order to solve the above technical problem, an embodiment of the present application provides a high voltage capacitor charging input port switch circuit, including: the circuit comprises a pre-charging module, a conduction control module, a disconnection control module and a main switch module, wherein the input end of the pre-charging module is connected with the power output end, the input end of the conduction control module is connected with the output end of the pre-charging module, the input end of the disconnection control module is connected with the output end of the pre-charging module, the control input end of the main switch module is connected with the output end of the conduction control module, the power input end of the main switch module is connected with the power output end, and the output end of the main switch module is connected with a capacitor to be charged.
In addition, the pre-charging module comprises a diode D1, a resistor R5 and a capacitor C2, wherein the anode of the diode D1 is connected with the power output end, the cathode of the diode is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the power output end of the main switch module; the connection point of the resistor R5 and the capacitor C2 is simultaneously connected with the input end of the conduction control module.
In addition, the main switch module comprises a main switch Q and a clamping circuit for clamping the gate voltage of the main switch Q.
In addition, the clamping circuit comprises a capacitor C3, a diode D3 and a resistor R8, wherein the capacitor C3, the diode D3 and the resistor R8 are all arranged at two ends of the main switch Q in parallel.
In addition, the main switch Q is an N-channel electronic switch.
In addition, the conduction control module comprises a switch Q3, a diode D2 and a resistor R6, wherein the diode D2 and the resistor R6 are arranged at two ends of the switch Q3 in parallel; the resistor R6 is also connected to the power output terminal of the main switch module through a resistor R7.
In addition, the diode D2 and/or the diode D3 are zener diodes.
In addition, the disconnection control module comprises a capacitor C1, a triode Q1 and a triode Q2, wherein the base electrode and the emitter electrode of the triode Q1 are respectively connected with two ends of the capacitor C1, and the base electrode of the triode Q1 is connected with one end of the capacitor C2 through a resistor R1; the collector of the triode Q1 is connected with one end of a capacitor C2 through a resistor R2, and the collector of the triode Q1 is also connected with the base of a triode Q2 through a resistor R3; the emitter of the triode Q1 is connected with the other end of the capacitor C2; the collector of the triode Q2 is connected with the other end of the capacitor C2 through the resistor R4, and the collector of the triode Q2 is also connected with the base of the triode Q1; the emitter of the transistor Q2 is connected to one end of the capacitor C2.
In addition, the transistor Q1 is an NPN-type transistor, and the transistor Q2 is a PNP-type transistor.
The embodiment of the application also provides a charging device, which comprises a charging power supply and the high-voltage capacitor charging input port switch circuit.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the embodiment of the application, the existing switch circuit is simplified, a control circuit module and an isolation circuit module in the existing switch circuit are eliminated, and the on-off of the switch can be reliably controlled independently only by driving the circuit module. The switching circuit of the embodiment of the application does not need an independent control circuit, and the main switch can be automatically switched on in the process of increasing the output voltage of the power supply and can be automatically switched off after the power supply is switched off; the switch circuit of the embodiment of the application also does not need an independent isolation circuit, and a signal isolation transmission circuit is not needed because a control signal transmitted from the microcontroller is not needed; since the power required by the drive circuit of the main switch is taken from the energy output by the power supply to the pre-charge capacitor, no isolated power supply is required.
The switch circuit of the embodiment of the application comprises a pre-charging module, a conducting control module, a disconnecting control module and a main switch module, wherein the pre-charging module is a pre-charging circuit, a pre-charging capacitor in the pre-charging circuit is charged firstly before the main switch reaches a conducting condition, and the pre-charging capacitor is used as a driving power supply of the main switch after being fully charged. The conduction control module is a switching-on control circuit of the main switch, and when the voltage of the pre-charging capacitor reaches a certain threshold value, the pre-charging capacitor is switched on to a gate pole of the main switch, so that the main switch is switched on. The disconnection control module is a main switch disconnection control circuit, disconnection delay time can be set to be the time when the capacitor to be charged is fully charged, and when the delay time is over, the charges of the pre-charged capacitor can be rapidly discharged, so that the main switch is disconnected.
The switching circuit of the embodiment of the application simplifies the types and the number of elements in the circuit and reduces the cost; meanwhile, the circuit reduces the volume of the main switch auxiliary circuit, and is beneficial to the miniaturization of the system; the circuit also reduces the power loss of the main switch auxiliary circuit, and is beneficial to improving the energy efficiency of the system.
Drawings
One or more embodiments are illustrated by the corresponding figures in the drawings, which are not meant to be limiting.
Fig. 1 is a block diagram of a switching circuit of a high-voltage capacitor charging input port provided in the related art;
FIG. 2 is a block diagram of a switching circuit for a high voltage capacitive charging input port according to an embodiment of the present application;
FIG. 3 is a block diagram of a switching circuit for a high voltage capacitive charging input port according to another embodiment of the present application;
fig. 4 is a circuit diagram of a switching circuit of a high-voltage capacitor charging input port according to an embodiment of the present application.
Detailed Description
As known from the background art, the conventional switch usually has a complex matching circuit, and has the disadvantages of large volume, many components, high cost, large power consumption and low energy efficiency.
It has been found that the above-mentioned disadvantages of the existing switching circuits are caused by the fact that, in order to ensure that the switches can be reliably switched on and off in a certain timing, the switching circuits usually require associated auxiliary circuits to ensure this function.
The switching circuit is mainly used in the application occasions using high-voltage capacitors, such as: a booster circuit of transcranial magnetic stimulation instrument. In order to avoid the influence of the front-stage charging power supply circuit on the rear-stage load during the discharging operation of the high-voltage capacitor, a switch is required to be added between the charging power supply and the high-voltage capacitor to isolate the influence of the charging power supply circuit on the load. When the high-voltage capacitor needs to be charged, the switch is switched on; after the high-voltage capacitor is charged, the switch is switched off. For example, in transcranial magnetic stimulation instruments, in order to avoid short circuit caused by polarity inversion of the voltage of the energy storage capacitor when the stimulation circuit works, the switch is usually added in the voltage boosting circuit. The high-voltage capacitor rear-stage load in the transcranial magnetic stimulation instrument is a magnetic stimulation coil, when the high-voltage capacitor is discharged to work, the high-voltage capacitor and the magnetic stimulation coil form resonance, and the voltage polarity of the capacitor can be reversed for a short time. If there is no open switch at the charging port of the high-voltage capacitor, the high-voltage capacitor with reversed voltage polarity will be short-circuited by the rectifying circuit of the charging power supply.
The added switch requires a matching circuit to ensure that it is reliably turned on and off in a certain timing sequence. According to the prior technical scheme, a matching circuit of the switch is complex, large in size, multiple in elements, high in cost and large in power consumption. The embodiment of the application aims to cancel a control circuit module and an isolation circuit module in the technical scheme of the existing switch matching circuit, and the on-off of the switch can be automatically and reliably controlled only by driving the circuit module.
Referring to fig. 1, the related art provides a switching circuit for a high-voltage capacitor charging input port. In fig. 1, C is a capacitor to be charged, where the capacitor to be charged may be a high voltage capacitor; in fig. 1, Q is a switch, and its accessory circuits include a driving circuit, an isolation circuit, and a control circuit. The output end of the control circuit is connected with the input end of the isolation circuit, the control circuit is used for generating a pulse signal required by switching on or switching off the switch Q, and the control circuit belongs to a low-voltage circuit. The output end of the isolation circuit is connected with the input end of the drive circuit, and the isolation circuit is used for isolating the low-voltage circuit (control circuit) from the high-voltage circuit and enabling signals to be transmitted between the low-voltage circuit and the high-voltage circuit in a lossless mode. The output of the driver circuit is connected to the switch Q, and the driver circuit is used to amplify the control signal of the switch Q, so that the switch Q can be completely turned on or off.
The embodiment of the application provides a simplified switch circuit in order to simplify the switch circuit in the related art and cancel a control circuit and an isolation circuit matched with the switch circuit in the related art. Referring to fig. 2, a simplified block diagram of a switching circuit according to an embodiment of the present application is shown. As shown in fig. 2, in the switching circuit according to the embodiment of the present application, a control circuit and an isolation circuit are omitted, and only a driving circuit is connected to a switch Q, so that the on/off of the switch Q is controlled by the driving circuit.
Referring to fig. 3, an embodiment of the present application provides a high-voltage capacitor charging input port switching circuit, including: the charging circuit comprises a pre-charging module 101, a conducting control module 102, a disconnecting control module 103 and a main switch module 104, wherein the input end of the pre-charging module 101 is connected with a power output end, the input end of the conducting control module 102 is connected with the output end of the pre-charging module 101, the input end of the disconnecting control module 103 is connected with the output end of the pre-charging module 101, the control input end of the main switch module 104 is connected with the output end of the conducting control module 102, the power input end of the main switch module 104 is connected with the power output end, and the output end of the main switch module 104 is connected with a capacitor to be charged.
In order to reduce the area of components and parts of a circuit and a circuit board, the switch circuit simplifies the existing switch circuit, and cancels a control circuit module and an isolation circuit module in the existing switch circuit. As shown in fig. 2, the switch circuit of the embodiment of the present application does not need a separate control circuit, and the main switch Q may be automatically turned on during the process of the output voltage rise of the power supply, and may be automatically turned off after the power supply is turned off; the switch circuit of the embodiment of the application also does not need an independent isolation circuit, and a signal isolation transmission circuit is not needed because a control signal transmitted from the microcontroller is not needed; since the power supply required by the drive circuit of the main switch Q is derived from the energy output by the power supply to the pre-charge capacitor, no isolated power supply is required.
In the switching circuit of the embodiment of the present application, the power supply is a charging power supply whose output is full-wave rectification. The pre-charging module 101 is a pre-charging circuit, and a pre-charging capacitor in the pre-charging circuit is charged before the main switch Q reaches the on condition, and is used as a driving power supply of the main switch Q after the pre-charging capacitor is fully charged. The turn-on control module 102 is a turn-on control circuit of the main switch Q, and when the voltage of the pre-charge capacitor reaches a certain threshold, the pre-charge capacitor is turned on to the gate of the main switch Q, thereby turning on the main switch Q. The turn-off control module 103 is a turn-off control circuit of the main switch Q, the turn-off delay time may be set to be a time when the capacitor to be charged is fully charged, and when the delay time is over, the charge of the pre-charged capacitor is rapidly discharged, so as to turn off the main switch Q.
In some embodiments, the pre-charge module 101 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 104; the junction of the resistor R5 and the capacitor C2 is connected to the input of the turn-on control module 102.
Referring to fig. 4, the precharge module 101 is a precharge circuit, the precharge circuit includes a diode D1, a resistor R5 and a capacitor C2, the capacitor C2 is a precharge capacitor, the precharge capacitor C2 in the precharge circuit is charged before the main switch Q reaches the on condition, and after the precharge capacitor C2 is fully charged, the precharge capacitor C2 is used as a driving power supply of the main switch Q to supply power to the main switch Q. A resistor R5 is provided between the diode D1 and the precharge capacitor C2, the resistor R5 is used to limit the precharge current and also to prolong the precharge time, and the precharge capacitor C2 does not complete the precharge when the duration of the DC + voltage at the power input terminal is too short. When the main switch Q is turned on, the voltage of the pre-charge capacitor C2 will be raised above Vo, and at this time, the voltage across the diode D1 is reverse biased, and the capacitor C2 will not discharge through the diode D1.
Note that the diode D1 may be a rectifier diode.
In some embodiments, the main switch module 104 includes a main switch Q and a clamp circuit for clamping the gate voltage of the main switch Q. The clamp circuit is mainly used for clamping the gate voltage of the main switch Q so that the gate voltage does not exceed a tolerance range.
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 disposed in parallel across the main switch Q.
Referring to fig. 4, the main switch module 104 includes a main switch Q and a clamp circuit for clamping the gate voltage of the main switch Q. The main switch Q can adopt an N-channel field effect transistor, the drain electrode of the main switch Q is connected with the input end of the power supply, the source electrode of the main switch Q is grounded through the capacitor to be charged, and the main switch Q is conducted when the grid voltage of the main switch Q is larger than Vg.
In some embodiments, the diode D3 may be a zener diode, the anode of the diode D3 is connected to the source of the main switch Q, the cathode of the diode D3 is connected to the gate of the main switch Q, and the drain of the main switch Q is connected to the power input terminal. Diode D3 is used to clamp the gate voltage of main switch Q so that it does not exceed a maximum limit. Two ends of the diode D3 are connected in parallel with a resistor R8, and the resistor R8 is mainly used for preventing the gate of the main switch Q from being suspended, so as to avoid the misconduction of the main switch Q. The two ends of the diode D3 are also connected in parallel with a capacitor C3, and the capacitor C3 is mainly used for stabilizing the gate voltage of the main switch Q and avoiding the gate of the main switch Q from being interfered.
In some embodiments, the main switch Q is an N-channel electronic switch.
In some embodiments, the main switch Q may be an N-channel Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), or a MOSFET for short.
In other embodiments, the main switch Q may also be an Insulated Gate Bipolar Transistor (IGBT), which has the advantages of both high input impedance of the MOSFET and low on-state voltage drop of the power Transistor (Giant Transistor-GTR).
It should be noted that when the switching circuit provided by the embodiment of the application is applied to a scene of a booster circuit in a transcranial magnetic stimulation instrument, the main switch Q adopts a low-power IGBT, the capacitor C to be charged is a high-voltage capacitor, and the high-voltage capacitor adopts an energy storage capacitor with an energy storage capacitor of more than 1000V; when magnetic stimulation occurs, the high-voltage capacitor and the external stimulation coil work in a resonance state, and by adopting the mode, the transcranial magnetic stimulation instrument can output bidirectional stimulation pulses and can recover the residual energy of the coil; the switching circuit is simple in structure, the areas of components and a circuit board in the circuit are greatly reduced, and the cost is reduced; meanwhile, the switch circuit reduces the volume of the main switch auxiliary circuit, is beneficial to system miniaturization, and is suitable for compact magnetic stimulation instruments.
In some embodiments, the conduction control module 102 includes a switch Q3, a diode D2, and a resistor R6, and the diode D2 and the resistor R6 are both disposed in parallel across the switch Q3; the resistor R6 is also connected to the power output of the main switch module 104 through a resistor R7.
Referring to fig. 4, the turn-on control module 102 is a main switch turn-on control circuit, and when the voltage of the pre-charge capacitor C2 of the pre-charge module 101 reaches a certain threshold, the pre-charge capacitor C2 is turned on to the gate of the main switch Q, thereby turning on the main switch Q. The conduction control module 102 is mainly used to control conduction of the main switch Q, and the resistor R6 and the resistor R7 are used to set a threshold value of conduction of the switch Q3, so that the switch Q3 is turned on only after the capacitor C2 in the pre-charge module 101 is charged to a sufficiently high voltage (e.g., 15V), so that when the main switch Q is turned on, it can be in a state of complete saturation conduction.
In some embodiments, switch Q3 may employ a P-channel electronic switch. As shown in fig. 4, when the gate voltage Vg of the switch Q3 1 The switch Q3 will conduct below a certain value. The source of the switch Q3 is connected to the cathode of the diode D3, the resistor R6 is connected in parallel between the drain and the gate of the switch Q3, the resistor R6 is connected to the anode of the diode D3 through the resistor R7, and both the resistor R6 and the resistor R7 are used to set the threshold for the conduction of the switch Q3. A diode D2 is connected in parallel between the drain and gate of the switch Q3 and is used to clamp the gate voltage of the switch Q3 so that it does not exceed a maximum limit.
In some embodiments, the diode D2 and/or the diode D3 is a zener diode.
In some embodiments, the diode D2 and the diode D3 are zener diodes, or the diode D2 is a zener diode or the diode D3 is a zener diode, which is not limited herein.
In some embodiments, the disconnection control module 103 includes a capacitor C1, a transistor Q1, and a transistor Q2, wherein a base and an emitter of the transistor Q1 are respectively connected to two ends of the capacitor C1, and a base of the transistor Q1 is connected to one end of the capacitor C2 through a resistor R1; the collector of the triode Q1 is connected with one end of a capacitor C2 through a resistor R2, and the collector of the triode Q1 is also connected with the base of a triode Q2 through a resistor R3; the emitter of the triode Q1 is connected with the other end of the capacitor C2; the collector of the triode Q2 is connected with the other end of the capacitor C2 through the resistor R4, and the collector of the triode Q2 is also connected with the base of the triode Q1; the emitter of the transistor Q2 is connected to one end of the capacitor C2.
Referring to fig. 4, the turn-off control module 103 is a main switch turn-off control circuit, and the turn-off delay time may be set as the time when the capacitor C to be charged is fully charged, and at the end of the delay time, the charge in the pre-charge capacitor C2 is rapidly discharged, so as to turn off the main switch Q. The resistor R1, the capacitor C1, and the resistor R4 in the turn-off control module 103 are used to delay the turn-off operation of the main switch Q. The capacitor C1 and the pre-charging capacitor C2 start to be charged at the same time, when the voltage of the capacitor C1 is charged to the conduction threshold of the transistor Q1, the transistor Q1 starts to be conducted, then the transistor Q2 is also conducted, the capacitor C1 is rapidly charged by the current through the transistor Q2, the voltage of the capacitor C1 rapidly rises, the transistor Q1 rapidly enters a saturation conduction state, so that the charge of the pre-charging capacitor C2 is rapidly released through the resistor R2 and the transistor Q1, and when the pre-charging capacitor C2 is discharged to be low enough, the main switch Q is disconnected.
In some embodiments, the transistor Q1 is an NPN type transistor and the transistor Q2 is a PNP type transistor.
The switching circuit of the charging input port of the high-voltage capacitor provided by the embodiment of the application comprises a pre-charging module 101, a conducting control module 102, a disconnecting control module 103 and a main switching module 104; the precharge module 101 is a precharge circuit, and the precharge capacitor C2 in the precharge module 101 is fully charged and used as a driving power source for the main switch Q. The turn-on control module 102 is a turn-on control circuit of the main switch Q, and when the voltage of the pre-charge capacitor reaches a certain threshold, the pre-charge capacitor is turned on to the gate of the main switch Q, thereby turning on the main switch Q. The turn-off control module 103 is a turn-off control circuit for the main switch Q, and when the delay time is over, the charge of the pre-charge capacitor C2 is rapidly discharged, so as to turn off the main switch Q. The switching circuit of the embodiment of the application simplifies the types and the number of elements in the circuit and reduces the cost; meanwhile, the circuit reduces the volume of the main switch auxiliary circuit, and is beneficial to the miniaturization of the system; the circuit also reduces the power loss of the main switch auxiliary circuit, and is beneficial to improving the energy efficiency of the system.
The embodiment of the application also provides a charging device, which comprises a charging power supply and the high-voltage capacitor charging input port switch circuit.
As mentioned above, the high-voltage capacitor charging input port switching circuit can be applied to a booster circuit of a transcranial magnetic stimulation instrument. When the high-voltage capacitor charging input port switching circuit is applied to a transcranial magnetic stimulation instrument, the main switch Q can adopt a low-power IGBT, so that the high-voltage capacitor can be short-circuited through a rectifying circuit of a charging power supply after the voltage polarity of the high-voltage capacitor is reversed, the driving circuit of the switching circuit can be simplified, the areas of auxiliary components and circuit boards can be greatly reduced, the device is more compact, the size and the weight of the device are reduced, and the device portability is facilitated.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice.

Claims (10)

1. A high voltage capacitor charging input port switch circuit, comprising:
the input end of the pre-charging module is connected with the output end of a power supply;
the input end of the conduction control module is connected with the output end of the pre-charging module;
the input end of the disconnection control module is connected with the output end of the pre-charging module;
the control input end of the main switch module is connected with the output end of the conduction control module, the power input end of the main switch module is connected with the power output end, and the output end of the main switch module is connected with the capacitor to be charged.
2. The switch circuit of claim 1, wherein the pre-charge module comprises a diode D1, a resistor R5, and a capacitor C2, wherein an anode of the diode D1 is connected to the power output terminal, a cathode of the diode is connected to one end of a resistor R5, another end of the resistor R5 is connected to one end of a capacitor C2, and another end of the capacitor C2 is connected to the power output terminal of the main switch module; the connection point of the resistor R5 and the capacitor C2 is simultaneously connected with the input end of the conduction control module.
3. The high-voltage capacitor charging input port switch circuit as claimed in claim 1, wherein said main switch module comprises a main switch Q and a clamp circuit for clamping a gate voltage of the main switch Q.
4. The switch circuit of claim 3, wherein the clamp circuit comprises a capacitor C3, a diode D3 and a resistor R8, and the capacitor C3, the diode D3 and the resistor R8 are all arranged in parallel across the main switch Q.
5. The high-voltage capacitor charging input port switch circuit as claimed in claim 3, wherein said main switch Q is an N-channel electronic switch.
6. The switch circuit of claim 1, wherein the conduction control module comprises a switch Q3, a diode D2 and a resistor R6, and the diode D2 and the resistor R6 are both arranged in parallel at two ends of the switch Q3; the resistor R6 is also connected with the power output end of the main switch module through a resistor R7.
7. The high-voltage capacitor charging input port switch circuit as claimed in claim 6, wherein the diode D2 and/or the diode D3 is a zener diode.
8. The switch circuit of claim 2, wherein the disconnection control module comprises a capacitor C1, a transistor Q1, and a transistor Q2, wherein a base and an emitter of the transistor Q1 are respectively connected to two ends of the capacitor C1, and a base of the transistor Q1 is connected to one end of the capacitor C2 through a resistor R1; the collector of the triode Q1 is connected with one end of a capacitor C2 through a resistor R2, and the collector of the triode Q1 is also connected with the base of a triode Q2 through a resistor R3; the emitter of the triode Q1 is connected with the other end of the capacitor C2;
the collector of the triode Q2 is connected with the other end of the capacitor C2 through the resistor R4, and the collector of the triode Q2 is also connected with the base of the triode Q1; the emitter of the transistor Q2 is connected to one end of the capacitor C2.
9. The switch circuit as claimed in claim 8, wherein the transistor Q1 is an NPN transistor and the transistor Q2 is a PNP transistor.
10. A charging device, comprising: a charging power supply and a high voltage capacitive charging input port switching circuit as claimed in any one of claims 1 to 9.
CN202210316359.4A 2022-03-28 2022-03-28 High-voltage capacitor charging input port switch circuit and charging device Pending CN114825512A (en)

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CN202210316359.4A CN114825512A (en) 2022-03-28 2022-03-28 High-voltage capacitor charging input port switch circuit and charging device

Applications Claiming Priority (1)

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CN202210316359.4A CN114825512A (en) 2022-03-28 2022-03-28 High-voltage capacitor charging input port switch circuit and charging device

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