WO2015154558A1

WO2015154558A1 - Transient interruption trigger device for alternating-current power source

Info

Publication number: WO2015154558A1
Application number: PCT/CN2015/070638
Authority: WO
Inventors: 李德辉
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-08-20
Filing date: 2015-01-13
Publication date: 2015-10-15
Also published as: CN105471233A

Abstract

A transient interruption trigger device for an alternating-current power source. The device comprises an alternating-current source (101), a voltage division circuit (102), an energy storage circuit (103), a control circuit (104) and a selector switch circuit (105), wherein the alternating-current source is configured to provide an alternating current for testing alternating-current transient interruption for a device under test (106); the voltage division circuit is configured to conduct voltage division and rectification on the alternating current output by the alternating-current source, output a direct-current power source and output the direct-current power source to the control circuit so as to provide an operating voltage for the control circuit, and output the direct-current power source to the energy storage circuit so as to charge the energy storage circuit; the energy storage circuit is configured to generate a constant gate voltage required by the selector switch circuit; the control circuit is configured to output a control signal to the control end of the selector switch circuit to control the switch motion of the selector switch circuit; and the selector switch circuit is configured to control the on-off state between the alternating-current source and the device under test according to the control signal output by the control circuit. The device has the advantages of low costs, a simple structure and easy operation.

Description

AC power transient trigger device

Technical field

The invention relates to the technical field of electrical and electronic equipment, and in particular to an AC power supply instantaneous triggering device.

Background technique

Short-time voltage interruption is a common power quality problem. According to the national standard GB/T17626.11, short-time voltage interruption means that the power supply voltage disappears for a period of time, generally no more than 1 minute. The short-term interruption of the voltage can be considered as 100% amplitude voltage sag, if the short-term interruption of the voltage is improperly handled, it will directly affect the normal operation of the power equipment, and even damage the power equipment, thus requiring the power equipment to have a high voltage short-term interruption. Anti-interference ability (ie, resistance to short-circuit capability). Therefore, in the field of testing of electronic and electrical equipment, the anti-short-circuit capability test is one of the most important indicators in the testing of electronic and electrical equipment, and the national standard GB/T 17626.11 specifies that the rated input current does not exceed 16A per phase and is connected to 50Hz/ The voltage of electronic and electrical equipment of the 60 Hz AC grid interrupts the immunity requirements for a short time. However, the current equipment capable of testing the anti-interruption capability of electronic and electrical equipment belongs to a programmable AC power supply device, which is expensive and mainly provided by foreign manufacturers, and the operation is also very cumbersome.

Summary of the invention

The main object of the present invention is to provide an AC power supply instantaneous triggering device which is low in cost and simple in structure.

To achieve the above object, the present invention provides an AC power supply transient triggering device, the AC power supply transient triggering device comprising an AC source, a voltage dividing circuit, a tank circuit, a control circuit and a switch circuit; wherein the AC source Provided to provide an AC power for the AC short-circuit test for the device to be tested; the voltage dividing circuit is configured to divide and rectify the AC power output by the AC source, output a DC power source, and output the DC power source To the control circuit, providing an operating voltage to the control circuit; and outputting the DC power supply to the energy storage circuit to charge the energy storage circuit; the energy storage circuit being configured to generate the switching a constant gate voltage required by the switching circuit; the control circuit is configured to output a control signal to a control end of the switch circuit to control a switching action of the switch circuit; the switch circuit is set to be The control signal outputted by the control circuit controls an on-off state between the AC source and the device under test.

Preferably, a center line of the AC source is connected to a center line of the device to be tested; the switch circuit is connected between a phase line of the AC source and a phase line of the device under test, and the switch The circuit is further connected to the control signal output end of the control circuit and the energy storage circuit; the first input end of the voltage dividing circuit and the a phase connection of the alternating current source, a second input end of the voltage dividing circuit is connected to a neutral line of the alternating current source, and an output end of the voltage dividing circuit is respectively connected to a power input end of the control circuit and the energy storage circuit connection.

Preferably, the switch circuit includes a first NMOS transistor and a second NMOS transistor; wherein a source of the first NMOS transistor is connected to a phase line of the AC source, and a drain of the first NMOS transistor is a drain of the second NMOS transistor is connected; a source of the second NMOS transistor is connected to a phase line of the device under test; a gate of the first NMOS transistor and a gate of the second NMOS transistor Both are connected to the control circuit.

Preferably, the control circuit includes a main control unit for generating the control signal, a first isolation circuit for isolating the main control unit and the first NMOS tube, and for the main control And a second isolation circuit in which the second NMOS transistor is isolated; wherein a gate of the first NMOS transistor is connected to a control signal output end of the main control unit via the first isolation circuit, The gate of the two NMOS transistors is connected to the control signal output end of the main control unit via the second isolation circuit.

Preferably, the first isolation circuit includes a first resistor, a second resistor, a third resistor, and a first optocoupler; wherein the first end of the first resistor is connected to the control signal output end of the main control unit a second end of the first resistor is connected to an anode of the LED in the first optocoupler; a cathode of the LED in the first optocoupler is connected to a ground end of the main control unit, the first a collector of the triode in the optocoupler is connected to the first end of the third resistor via the second resistor, and an emitter of the triode in the first optocoupler is connected to a second end of the third resistor, and The source of the first NMOS transistor is connected.

Preferably, the second isolation circuit has a fourth resistor, a fifth resistor, and a second photocoupler; wherein an anode of the LED in the second optocoupler is connected to an anode of the LED in the first optocoupler, a cathode of the LED in the second optocoupler is connected to the cathode of the LED in the first optocoupler, and a collector of the transistor in the second optocoupler is connected to the first end of the fifth resistor via the fourth resistor The emitter of the transistor in the second optocoupler is connected to the second end of the fifth resistor and is connected to the source of the second NMOS transistor; the source of the second NMOS transistor is also The phase line connection of the device under test.

Preferably, the first isolation circuit further includes a sixth resistor, a first end of the sixth resistor is coupled to the first end of the third resistor, and a second end of the sixth resistor is coupled to the voltage divider The second isolation circuit further includes a seventh resistor, the first end of the seventh resistor is coupled to the first end of the fifth resistor, and the second end of the seventh resistor is coupled to the voltage divider Circuit connection.

Preferably, the voltage dividing circuit comprises a first voltage dividing circuit and a second voltage dividing circuit; wherein the first voltage dividing circuit comprises an eighth resistor, a ninth resistor and a first diode; the eighth resistor The first end is grounded and connected to the neutral line of the alternating current source, the second end of the eighth resistor is connected to the anode of the first diode; the cathode of the first diode and the first a second end of the sixth resistor is connected; the first end of the ninth resistor and the eighth resistor The second end is connected, the second end of the ninth resistor is connected to the phase line of the alternating current source; the second voltage dividing circuit comprises a tenth resistor, an eleventh resistor and a second diode; a first end of the tenth resistor is grounded, a second end of the tenth resistor is connected to an anode of the second diode, and a cathode of the second diode is connected to a second end of the seventh resistor The first end of the eleventh resistor is connected to the second end of the tenth resistor, and the second end of the eleventh resistor is connected to the source of the second NMOS transistor.

Preferably, the energy storage circuit includes a first capacitor and a second capacitor; wherein a first end of the first capacitor is connected to a cathode of the first diode, and a second end of the first capacitor is An emitter of the triode in the first optocoupler is connected; a first end of the second capacitor is coupled to a cathode of the second diode, and a second end of the second capacitor is coupled to the second optocoupler The emitter of the middle transistor is connected.

The AC power supply instantaneous triggering device comprises an AC source, a voltage dividing circuit, a energy storage circuit, a control circuit and a switch circuit; wherein the AC source is configured to provide an AC instantaneous test for the device to be tested An alternating current circuit; the voltage dividing circuit is configured to divide and rectify an alternating current output by the alternating current source, output a direct current power source, and output the direct current power source to the control circuit to provide the control circuit Operating voltage; and outputting the DC power source to the tank circuit to charge the tank circuit; the tank circuit being configured to generate a constant grid voltage required for the switch circuit; a circuit configured to output a control signal to a control end of the switch circuit to control a switching action of the switch circuit; the switch circuit is configured to control the exchange according to a control signal output by the control circuit The on-off state between the source and the device under test. The AC power supply instantaneous trigger device has the advantages of simple circuit structure and low cost; and the AC power supply instantaneous trigger device can make the short-circuit resistance test of the electronic and electrical equipment simpler; and the invention also has reliability High and easy to implement.

DRAWINGS

1 is a block diagram showing the structure of an embodiment of an AC power supply transient triggering device according to the present invention;

2 is a schematic diagram showing the circuit structure of an embodiment of an AC power supply transient triggering device according to the present invention;

3 is a test waveform diagram of an AC power supply transient triggering test of the AC power supply of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides an AC power supply instantaneous triggering device.

1 is a block diagram showing an embodiment of an AC power supply transient triggering device according to an embodiment of the present invention.

In this embodiment, the AC power supply transient triggering device includes an AC source 101, a voltage dividing circuit 102, a tank circuit 103, a control circuit 104, and a switch circuit 105.

The center line N of the AC source 101 is connected to the center line of the device under test 106; the switch circuit 105 is connected between the phase line L of the AC source 101 and the phase line of the device under test 106, and The switch circuit 105 is further connected to the control signal output end of the control circuit 104 and the energy storage circuit 103; the first input end of the voltage dividing circuit 102 is connected to the phase line of the AC source 101. The second input end of the voltage dividing circuit 102 is connected to the neutral line of the AC source 101, and the output end of the voltage dividing circuit 102 is respectively connected to the power input end of the control circuit 104 and the energy storage circuit 103. .

In this embodiment, the AC source 101 is configured to provide the device under test 106 with alternating current for AC instantaneous test;

The voltage dividing circuit 102 is configured to divide and rectify the alternating current output by the alternating current source 101, output a direct current power source, and output the direct current power source to the control circuit 104 to provide work for the control circuit. And outputting the DC power source to the energy storage circuit 103 to charge the energy storage circuit 103;

The energy storage circuit 103 is configured to generate a constant gate voltage required by the switch circuit 105;

The control circuit 104 is configured to output a control signal to the control end of the switch circuit 105 to control the switching action of the switch circuit 105;

The switch circuit 105 is configured to control an on-off state between the AC source 101 and the device under test 106 according to a control signal output by the control circuit 104.

Referring to FIG. 2, FIG. 2 is a schematic diagram showing the circuit structure of an embodiment of an AC power supply transient triggering device according to the present invention.

In this embodiment, the switch circuit 205 includes a first NMOS transistor T1 and a second NMOS transistor T2. The source of the first NMOS transistor T1 is connected to the phase line of the AC source 201, and the first NMOS is connected. a drain of the transistor T1 is connected to a drain of the second NMOS transistor T2; a source of the second NMOS transistor T2 is connected to a phase line of the device under test 206; a gate of the first NMOS transistor T1 And a gate of the second NMOS transistor T2 is connected to the control circuit 204.

In this embodiment, the control circuit 204 includes a main control unit 2041 for generating the control signal, and a first isolation circuit 2042 for isolating the main control unit 2041 and the first NMOS transistor T1. a second isolation circuit 2043 that isolates the main control unit 2041 and the second NMOS transistor T2; wherein a gate of the first NMOS transistor T1 passes through the first isolation circuit 2042 and the main control unit The control signal output end of the second NMOS transistor T2 is connected to the control signal output end of the main control unit 2041 via the second isolation circuit 2043.

The first isolation circuit 2042 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first optocoupler OC1. The first end of the first resistor R1 and the main control unit 2041 a control signal output terminal is connected, a second end of the first resistor R1 is connected to an anode of the LED in the first optocoupler OC1; a cathode of the LED in the first optocoupler OC1 and the main control unit a ground connection of 2041, a collector of the transistor in the first optocoupler OC1 is connected to a first end of the third resistor R3 via the second resistor R2, and an emitter of the triode in the first optocoupler OC1 Connected to the second end of the third resistor R3 and connected to the source of the first NMOS transistor T1.

Further, in this embodiment, the first isolation circuit 2042 further includes a sixth resistor R6, and the first end of the sixth resistor R6 is connected to the first end of the third resistor R3, and the sixth resistor a second end of R6 is connected to the voltage dividing circuit 202;

The second isolation circuit 2043 has a fourth resistor R4, a fifth resistor R5, and a second photocoupler OC2. The anode of the LED in the second optocoupler OC2 is connected to the anode of the LED in the first optocoupler OC1. a cathode of the light emitting diode of the second photocoupler OC2 is connected to a cathode of the light emitting diode of the first photocoupler OC1, and a collector of the transistor of the second photocoupler OC2 passes through the fourth resistor R4 and the first The first end of the fifth resistor R5 is connected, the emitter of the transistor in the second optocoupler OC2 is connected to the second end of the fifth resistor R5, and is connected to the source of the second NMOS transistor T2; The source of the second NMOS transistor T2 is also connected to the phase line of the device under test 206.

Further, in this embodiment, the second isolation circuit 2043 further includes a seventh resistor R7, and the first end of the seventh resistor R7 is connected to the first end of the fifth resistor R5, and the seventh resistor The second end of R7 is coupled to the voltage dividing circuit 202.

In this embodiment, the voltage dividing circuit 202 includes a first voltage dividing circuit 2021 and a second voltage dividing circuit 2022. The first voltage dividing circuit 2021 includes an eighth resistor R8, a ninth resistor R9, and a first two. The first end of the eighth resistor R8 is grounded and connected to the neutral line N of the alternating current source 201, and the second end of the eighth resistor R8 is connected to the anode of the first diode D1 a cathode of the first diode D1 and the sixth electricity a second end of the resistor R6 is connected; a first end of the ninth resistor R9 is connected to a second end of the eighth resistor R8, and a second end of the ninth resistor R9 is connected to the phase line of the AC source 201 L connection;

The second voltage dividing circuit 2022 includes a tenth resistor R10, an eleventh resistor R11 and a second diode D2; the first end of the tenth resistor R10 is grounded, and the second end of the tenth resistor R10 is An anode of the second diode D2 is connected; a cathode of the second diode D2 is connected to a second end of the seventh resistor R7; and a first end of the eleventh resistor R11 is opposite to the first The second end of the ten resistor R10 is connected, and the second end of the eleventh resistor R11 is connected to the source of the second NMOS transistor T2.

In this embodiment, the energy storage circuit includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is connected to the cathode of the first diode D1. The second end of the capacitor C1 is connected to the emitter of the triode in the first optocoupler OC1; the first end of the second capacitor C2 is connected to the cathode of the second diode D2, and the second capacitor C2 The second end is connected to the emitter of the transistor in the second photocoupler OC2.

In this embodiment, the first NMOS transistor T1 and the second NMOS transistor T2 in the switching circuit 205 have a fast response capability of a millisecond level. In the conventional design, due to the parasitic diode characteristics of the NMOS transistor, the source-to-drain direction of the NMOS transistor is always unidirectional. Therefore, a single NMOS transistor can only be used for the on-off control of the DC unidirectional circuit, and cannot be used for The on/off control of the alternating current at any phase time, because if a single NMOS transistor is used for the on/off control of the alternating current, only half of the wave can always pass through the NMOS transistor. In this embodiment, the first NMOS transistor T1 and the second NMOS transistor T2 are used in combination to realize on-off control of an alternating current at any phase. In this embodiment, the first NMOS transistor T1 and the second NMOS transistor T2 are symmetrically placed, the drain of the first NMOS transistor T1 and the drain of the second NMOS transistor T2 are shorted, and the source of the first NMOS transistor T1 serves as a switch. One end of the circuit 205 and the source of the second NMOS transistor T2 serve as the other end of the switching circuit 205. According to this design, each NMOS transistor only controls the half-wave of the alternating current, and the parasitic diode of one of the NMOS transistors When a certain half-wave waveguide of the alternating current is turned on, the parasitic diode of the other NMOS transistor is inevitably non-conducting. Therefore, the switching switch circuit 205 in this embodiment can perform on-off control of the entire wave of the alternating current, thereby realizing arbitrary alternating current. On/off control of phase timing. However, when the first NMOS transistor T1 and the second NMOS transistor T2 are used as switches, it is necessary to control the turn-on voltage Vgs (ie, when the voltage between the gate and the source of the NMOS transistor is greater than the turn-on threshold voltage Vgs-th thereof). , the NMOS transistor begins to conduct). For example, in FIG. 2, after the alternating current of the alternating current source 202 is turned off, the turn-on voltage Vgs of the second NMOS transistor T2 needs to be controlled, otherwise the second NMOS transistor T2 cannot be turned on again, and if the second NMOS transistor T2 cannot be made again When turned on, repeated on-off control between the AC source 202 and the device under test 206 cannot be achieved. Therefore, in this embodiment, the switch circuit 205 must cooperate with the first capacitor C1, the second capacitor C2, and the control circuit 204 in the tank circuit to implement repeated on-off control between the AC source 202 and the device under test 206. .

In this embodiment, the output voltage of the voltage dividing circuit 202 after dividing the alternating current of the alternating current source 201 cannot exceed the withstand voltage of the first capacitor C1 and the second capacitor C2 in the tank circuit, and the unstable factor of the alternating current is considered. In the embodiment, if the first capacitor C1 and the second capacitor C2 select an aluminum electrolytic capacitor with a withstand voltage of 100V, the output voltage value of the voltage dividing circuit 202 for dividing the alternating current of the alternating current source 201 should be controlled at 12V to 50V. ;

In this embodiment, the first capacitor C1 and the second capacitor C2 in the tank circuit are used to generate a control electric signal required by the control circuit 204. For example, when the AC power of the AC source 201 is cut off, the embodiment can use the energy storage. The electric energy stored in the second capacitor C2 in the circuit supplies power to the gate of the second NMOS transistor T2, so that the voltage between the gate and the source of the second NMOS transistor T2 is greater than the threshold voltage Vgs-th thereof, so that The two NMOS transistors T2 can be turned on again. In this embodiment, the first capacitor C1 and the second capacitor C2 are preferably capacitors of the order of not less than 100 uF. Meanwhile, in order to ensure fast charging of the first capacitor C1 and the second capacitor C2, the eighth resistor R8, the ninth resistor R9 in the first voltage dividing circuit 2021, and the tenth resistor R10, tenth in the second voltage dividing circuit 2022 A resistor R11 should preferably have a resistance of 1K to 10K ohms.

In addition, in the present embodiment, when the NMOS transistor is used as a switch, the switching control function of the NMOS transistor can be realized by controlling the gate signal of the NMOS transistor. In this embodiment, if the control part of the changeover switch circuit 205 and the AC power supply part are not isolated, the AC source 201 may cause damage to the control part of the switch circuit 205 (ie, the main control unit 2041), and even cause a safety hazard. Therefore, in the present embodiment, the control portion of the switch circuit 205 and the AC power supply portion are isolated using a fast photocoupler (i.e., the first photocoupler OC1 and the second photocoupler OC2 described above).

In this embodiment, when the main control unit 2041 outputs a corresponding control signal to control the first optocoupler OC1 and the second optocoupler OC2 to be non-conducting, the first capacitor C1 controls the gate and the source of the first NMOS transistor T1. The voltage between them is greater than its turn-on threshold voltage Vgs-th, so that the first NMOS transistor T1 is turned on; the second capacitor C2 controls the voltage between the gate and the source of the second NMOS transistor T2 is greater than its turn-on threshold voltage Vgs -th, the second NMOS transistor T2 is turned on, so that the AC source 201 and the device under test 206 are in a path state (ie, the device under test 206 is in a normal power supply state at this time);

When the control signal output end of the main control unit 2041 outputs a corresponding control signal, and the first optocoupler OC1 and the second optocoupler OC2 are controlled to be turned on, the conduction of the first optocoupler OC1 causes the gate of the first NMOS transistor T1 to The voltage between the sources is less than its turn-on threshold voltage Vgs-th, and the second optocoupler OC2 is turned on such that the voltage between the gate and the source of the second NMOS transistor T2 is less than its turn-on threshold voltage Vgs-th, The first NMOS transistor T1 and the second NMOS transistor T2 are turned off, so that the AC source 201 and the device under test 206 are in an open state (ie, the device under test 206 is in a power-off state at this time).

In addition, it should be noted that the sixth resistor R6 in the first isolation circuit 2042 and the seventh resistor R7 in the second isolation circuit 2043 are unnecessary; and, if the first capacitor C1 and the second capacitor C2 are When a capacitor of a larger capacity is selected, the maximum divided voltage of the eighth resistor R8 and the ninth resistor R9 can be controlled by the typical maximum open threshold voltage (12V) of the first NMOS transistor T1.

2 and FIG. 3, in FIG. 3, 301 is a power supply waveform diagram of the device under

test

206, 302 is a waveform diagram of the alternating current of the

AC source

201, and 303 is a waveform diagram of a control signal output by the main control unit 2041. Specifically, when the control signal output by the main control unit 2041 is at a high level, the first optocoupler OC1 and the second optocoupler OC2 are turned on, and the first NMOS transistor T1 and the second NMOS transistor T2 are turned off, thereby causing the AC source 201. The device under test 206 is in an open state, that is, the time when the control signal output by the main control unit 2041 is at a high level, the device under test 206 is in a power-down state; when the control signal output by the main control unit 2041 is at a low level The first optocoupler OC1 and the second optocoupler OC2 are turned off, and the first NMOS transistor T1 and the second NMOS transistor T2 are turned on, so that the path between the AC source 201 and the device under test 206 is the path state, that is, the main control unit 2041 During the time when the output control signal is low, the device under test 206 is in a normal power supply state. In this embodiment, the main control unit 2041 can also perform phase detection on the AC source 201 according to the specific requirements for testing the device to be tested for the resistance to the short-circuit capability, thereby achieving precise control of the time and time required for the device to be tested 206. .

The AC power supply short-circuit triggering device provided in this embodiment has a simple circuit structure and low cost; and the operation of the AC power supply short-circuit triggering device in this embodiment is simple, and only the main control unit in the control circuit outputs a corresponding control signal. The on-off and off-circuit control between the AC source and the device under test is realized, so that the AC power supply instantaneous trigger device of the embodiment can make the anti-short-circuit capability test of the electronic and electrical equipment (device under test) easier; In the embodiment, the switching speed of the switching switch (the first NMOS transistor and the second NMOS transistor) in the AC power supply short-circuit triggering device is fast, and can meet the testing requirements of the electronic device and the electrical device for the anti-burst capability test; in addition, the AC power supply of the embodiment is instantaneous. The break trigger device also has the advantages of high reliability and easy implementation.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Industrial applicability

As described above, the AC power supply short-circuit triggering device provided by the above embodiments and preferred embodiments has a simple circuit structure and low cost; and the AC power supply short-circuit triggering device can make the anti-interruption capability test of electronic and electrical equipment become It is simpler; at the same time, it has the advantages of high reliability and easy implementation.

Claims

An AC power supply instantaneous triggering device comprises an AC source, a voltage dividing circuit, a energy storage circuit, a control circuit and a switch circuit; wherein

The AC source is configured to provide an AC power for an AC short-circuit test for the device to be tested;

The voltage dividing circuit is configured to divide and rectify the alternating current output by the alternating current source, output a direct current power source, and output the direct current power source to the control circuit to provide a working voltage for the control circuit; Outputting the DC power source to the energy storage circuit to charge the energy storage circuit;

The energy storage circuit is configured to generate a constant gate voltage required by the switch circuit;

The control circuit is configured to output a control signal to a control end of the switch circuit to control a switching action of the switch circuit;

The switch circuit is configured to control an on-off state between the AC source and the device under test according to a control signal output by the control circuit.
The AC power supply instantaneous triggering device of claim 1 , wherein a center line of the AC source is connected to a center line of the device to be tested; and the switching circuit is connected to a phase line of the AC source and the standby line Between the phase lines of the measuring device, and the switching circuit is further connected to the control signal output end of the control circuit and the energy storage circuit; the first input end of the voltage dividing circuit and the AC source The phase connection is connected, the second input end of the voltage dividing circuit is connected to the neutral line of the AC source, and the output end of the voltage dividing circuit is respectively connected to the power input end of the control circuit and the energy storage circuit.
The AC power supply instantaneous triggering device of claim 2, wherein the switching circuit comprises a first NMOS transistor and a second NMOS transistor;

a source of the first NMOS transistor is connected to a phase line of the alternating current source, a drain of the first NMOS transistor is connected to a drain of the second NMOS transistor, and a source of the second NMOS transistor is The phase line connection of the device under test; the gate of the first NMOS transistor and the gate of the second NMOS transistor are both connected to the control circuit.
The AC power supply instantaneous triggering device of claim 3, wherein said control circuit comprises a main control unit for generating said control signal, for isolating said main control unit and said first NMOS transistor a first isolation circuit and a second isolation circuit for isolating the main control unit and the second NMOS transistor; wherein

a gate of the first NMOS transistor is connected to a control signal output end of the main control unit via the first isolation circuit, and a gate of the second NMOS transistor is connected to the main control via the second isolation circuit The control signal output of the unit is connected.
The AC power supply instantaneous triggering device of claim 4, wherein the first isolation circuit comprises a first resistor, a second resistor, a third resistor, and a first optocoupler;

a first end of the first resistor is connected to a control signal output end of the main control unit, and a second end of the first resistor is connected to an anode of the light emitting diode in the first optocoupler; a cathode of the coupling light emitting diode is connected to a ground end of the main control unit, and a collector of the triode in the first optical coupling is connected to a first end of the third resistor via the second resistor, the first The emitter of the transistor in the optocoupler is connected to the second end of the third resistor and is connected to the source of the first NMOS transistor.
The AC power supply instantaneous triggering device of claim 5, wherein the second isolation circuit has a fourth resistor, a fifth resistor, and a second photocouple; wherein

The anode of the light-emitting diode of the second optical coupler is connected to the anode of the light-emitting diode of the first optical coupler, and the cathode of the light-emitting diode of the second optical coupler is connected with the cathode of the light-emitting diode of the first optical coupler. a collector of the transistor in the second optocoupler is connected to the first end of the fifth resistor via the fourth resistor, and an emitter of the transistor in the second optocoupler is connected to the second end of the fifth resistor, And being connected to a source of the second NMOS transistor; a source of the second NMOS transistor is further connected to a phase line of the device to be tested.
The AC power supply short-circuit triggering device of claim 6, wherein the first isolation circuit further comprises a sixth resistor, the first end of the sixth resistor being connected to the first end of the third resistor, a second end of the sixth resistor is connected to the voltage dividing circuit; the second isolation circuit further includes a seventh resistor, the first end of the seventh resistor is connected to the first end of the fifth resistor, The second end of the seventh resistor is connected to the voltage dividing circuit.
The AC power supply instantaneous triggering device of claim 7, wherein the voltage dividing circuit comprises a first voltage dividing circuit and a second voltage dividing circuit;

The first voltage dividing circuit includes an eighth resistor, a ninth resistor, and a first diode; a first end of the eighth resistor is grounded, and is connected to a center line of the alternating current source, and the eighth resistor is The two ends are connected to the anode of the first diode; the cathode of the first diode is connected to the second end of the sixth resistor; the first end of the ninth resistor and the eighth resistor The second end of the ninth resistor is connected to the phase line of the AC source;

The second voltage dividing circuit includes a tenth resistor, an eleventh resistor and a second diode; a first end of the tenth resistor is grounded, and a second end of the tenth resistor and the second diode An anode connection of the tube; a cathode of the second diode is coupled to the second end of the seventh resistor; a first end of the eleventh resistor is coupled to a second end of the tenth resistor, The second end of the eleventh resistor is connected to the source of the second NMOS transistor.
The AC power supply instantaneous triggering device of claim 8, wherein the energy storage circuit comprises a first capacitor and a second capacitor; wherein

a first end of the first capacitor is connected to a cathode of the first diode, a second end of the first capacitor is connected to an emitter of a triode in the first optocoupler; The first end is connected to the cathode of the second diode, and the second end of the second capacitor is connected to the emitter of the transistor in the second photocoupler.