CN211981484U

CN211981484U - Overvoltage protection circuit of current-limiting fuse

Info

Publication number: CN211981484U
Application number: CN202020614632.8U
Authority: CN
Inventors: 沈凯; 黄河清; 李帅帅
Original assignee: Nanjing Ronggang Kaikai Electric Co ltd
Current assignee: Nanjing Taichuan Electric Technology Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-11-20
Anticipated expiration: 2030-04-22

Abstract

The utility model discloses a current-limiting fuse overvoltage crowbar, include: the power generation control device comprises a power generation control module, a current limiting module, an overcurrent control module, an overvoltage protection module and a conversion output module, wherein an inductor Lg at the tail end of a generator in the power generation control module filters interference signals of each output end of a three-phase impact generator, and a resistor Rg is grounded to protect the lightning protection and leakage protection effects of the generator; the variable resistor RV1 in the current-limiting protection module enables the current flowing paths to be different by changing the resistance value so as to limit the current value; a triode Q3 in the overcurrent control module detects the output current value, and a diode D4 transmits the generated high current to a variable resistor RV2 for regulation again; the one-way thyristor U1 in the overvoltage protection module controls a transmission path exceeding standard voltage, and a resistor R9 and a resistor R8 form a series voltage division circuit to reduce the output voltage value; and a capacitor Cb in the conversion output module prevents direct current from being transmitted in a circuit, so that the running safety of equipment is protected.

Description

Overvoltage protection circuit of current-limiting fuse

Technical Field

The utility model belongs to the technical field of circuit protection and specifically relates to a current-limiting fuse overvoltage crowbar.

Background

The circuit protection mainly protects electronic components from overvoltage, overcurrent, surge and electromagnetic interference, so that the circuit components are damaged and power supply equipment is damaged; with the continuous updating and upgrading of electronic equipment, the electronic equipment becomes complex and diversified, and applied circuit protection components and parts cannot meet diversified circuit protection fuses.

When the existing current-limiting fusing protection circuit obtains electric power through the obtained generator, interference sources generated by each phase line cannot be filtered, and the stability of the output voltage of the generator cannot be controlled; meanwhile, when the interior of the circuit is protected, lightning strike and electric leakage cannot be effectively prevented, and a partial discharge phenomenon is generated between phase lines of the generator; a single adjusting method is adopted in an actual current limiting circuit, so that the current adjusting range is limited, and the usability is reduced; when the traditional overvoltage protection circuit detects high voltage, the operation of equipment is cut off, and the voltage value cannot be effectively decomposed, so that important equipment can normally operate.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the overvoltage protection circuit of the current-limiting fuse is provided to solve the problems in the prior art.

The technical scheme is as follows: a current limiting fuse overvoltage protection circuit comprising: the power generation control module is provided with a generator tail end inductor Lg for filtering interference signals of each output end of a three-phase impact generator, so that the stability of output voltage can be maintained under the action of instantaneous high voltage, and a resistor Rg is grounded to protect the generator against lightning stroke and electric leakage; the variable resistor RV1 and the variable resistor RV2 in the current-limiting protection module enable the current flowing paths to be different by changing the resistance value so as to limit the current value; a triode Q3 in the overcurrent control module detects the output current value, and a diode D4 transmits the generated high current to a variable resistor RV2 for regulation again; the unidirectional silicon controlled rectifier U1 in the overvoltage protection module controls an output path exceeding standard voltage, and a resistor R9 and a resistor R8 form a series voltage division characteristic to reduce an output voltage value; and a capacitor Cb in the conversion output module prevents direct current from being transmitted in a circuit and is used as the safety of the operation of the instantaneous starting voltage protection equipment of the generator.

In a further embodiment, the power generation control module comprises a generator tail end inductor Lg, a resistor Rg, an impact generator Va, an impact generator Vb, an impact generator Vc, a Switch, a capacitor C1 and a zinc oxide arrester MOA1, wherein a pin 1, a pin 2 and a pin 3 of the generator tail end inductor Lg are all connected with one end of the resistor Rg; the other end of the resistor Rg is connected with a ground wire GND; the tail end inductor Lg pin 6 of the generator is connected with one end of an impact generator Va; the tail end inductor Lg pin 5 of the generator is connected with one end Vb of the impact generator; the tail end inductor Lg pin 4 of the generator is connected with one end of an impact generator Vc; the other end of the impulse generator Va is respectively connected with a Switch pin 1, a zinc oxide arrester MOA1 pin 1 and a pin 6; the other end of the impulse generator Vb is connected with a Switch pin 2, a zinc oxide arrester MOA1 pin 2 and a pin 3 respectively; the other end of the impulse generator Vc is respectively connected with a Switch pin 3, a zinc oxide arrester MOA1 pin 4 and a pin 5; the Switch pin 6 is connected with the positive terminal of a capacitor C1.

In a further embodiment, the current limiting module includes a resistor R1, a transistor Q1, a resistor R2, a diode D2, a capacitor C2, a resistor R4, a diode D1, a variable resistor RV1, a capacitor C3, a resistor R3, a transistor Q2, a resistor R5, a diode D3, and a variable resistor RV2, wherein one end of the resistor R1 is connected to the negative terminal of the capacitor C1; the other end of the resistor R1 is connected with the emitter terminal of the triode Q1; the base terminal of the triode Q1 is connected with one end of a resistor R2; the collector terminal of the triode Q1 is connected with the positive terminal of a diode D1; the other end of the resistor R2 is respectively connected with one end of a capacitor C2 and the positive end of a diode D2; the other end of the capacitor C2 is connected with pin 1 of a variable resistor RV 1; the negative end of the diode D2 is respectively connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of a variable resistor RV2, a collector end of a triode Q2 and a ground wire GND; the other end of the resistor R4 is connected with the other end of the capacitor C3; the negative end of the diode D1 is respectively connected with one end of a resistor R3, the base end of a triode Q2 and one end of a resistor R5; the pin 2 of the variable resistor RV1 is respectively connected with the other end of the resistor R3 and the emitter terminal of the triode Q2; the other end of the resistor R5 is connected with the positive end of a diode D3; the negative terminal of the diode D3 is connected with pin 1 of the variable resistor RV 2.

In a further embodiment, the over-current control module comprises a resistor R6, a transistor Q3, a resistor R7 and a diode D4, wherein one end of the resistor R6 is connected to the negative terminal of the diode D4, and the other end of the resistor R5 is connected to the positive terminal of the diode D3; the other end of the resistor R6 is connected with the emitter terminal of the triode Q3; the base end of the triode Q3 is respectively connected with the positive end of a diode D4 and one end of a resistor R7; the other end of the resistor R7 is connected with the cathode end of the diode D2 and is connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND respectively.

In a further embodiment, the overvoltage protection module comprises a diode D5, a triac U1, a resistor R8, a resistor R9 and a capacitor C4, wherein the negative terminal of the diode D5 is connected with the positive terminal of the triac U1 and the collector terminal of the transistor Q3 respectively; the positive end of the diode D5 is connected with one end of a resistor R8; the other end of the resistor R8 is respectively connected with one end of a resistor R9, one end of a capacitor C4 and a pin 1 of a one-way thyristor U1; the other end of the resistor R9 is respectively connected with the other end of the capacitor C4, the negative end of the unidirectional silicon controlled rectifier U1 and the other end of the resistor R7 are respectively connected with the negative end of the diode D2, and respectively connected with one end of the resistor R4, one end of the capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND.

In a further embodiment, the conversion output module comprises a generator head end inductor Lt, a capacitor Cb, a zinc oxide arrester MOA2, a transformer Tr, a test fuse TF, a phase modulation resistor Rs, a capacitor Cs, and a fuse equivalent nonlinear resistor ENM, wherein a pin 5 of the generator head end inductor Lt is respectively connected with a negative terminal of a diode D5, a positive terminal of a unidirectional thyristor U1, and a collector terminal of a triode Q3; a pin 4 of a head-end inductor Lt of the generator is respectively connected with a pin 3 of a transformer Tr, a pin 1 of a capacitor Cb and one end of a zinc oxide arrester MOA 2; the lead pin 3 of the generator head end inductor Lt is connected with the lead pin 2 of the capacitor Cb, and the lead pin 3 of the generator head end inductor Lt is fixed with the middle section of the zinc oxide arrester MOA2 in a non-contact manner; a pin 2 of a head end inductor Lt of the generator is connected with a pin 5 of a Switch; the lead 1 of the inductance Lt at the head end of the generator is respectively connected with Cb silver paste of a capacitor, the other end of a zinc oxide arrester MOA2 and a lead 4 of a transformer Tr; a pin 6 of a generator head end inductor Lt is connected with a pin 4 of a Switch; the transformer Tr pin 1 is respectively connected with one end of a phase modulation resistor Rs, one end of a test fuse TF and one end of a fuse equivalent nonlinear resistor ENM; the pin 2 of the transformer Tr is respectively connected with one end of a capacitor Cs, the other end of a test fuse TF, the other end of a fuse equivalent nonlinear resistor ENM and a ground wire GND; the other end of the capacitor Cs is connected with the other end of the phase modulation resistor Rs; and the pin 4, the pin 5 and the pin 6 of the capacitor Cb are all connected with a ground wire GND.

In a further embodiment, the diode D1 is a zener diode; the model of the triode Q1, the model of the triode Q2 and the model of the triode Q3 are PNP; the capacitor C1 is an electrolytic capacitor.

Has the advantages that: the utility model can effectively filter the interference generated between each phase line of the three-phase impulse generator by connecting the inductance Lg at the tail end of the generator, and can generate instantaneous high voltage to keep the output voltage of the three-phase impulse generator stable; one end of the resistor Rg is grounded and used for protecting the generator and circuit components from being struck by lightning and leaking electricity, so that the generated voltage is transmitted to the ground, and the phenomenon of partial discharge caused by the electricity leakage among phase lines is prevented; in the current-limiting protection module, the variable resistor RV1 and the variable resistor RV2 enable the paths through which the current flows to be different by changing the resistance value, so that the output of the current is limited, the variable resistor RV2 can be adjusted according to the unqualified current fed back by the overcurrent module, and the current is adjusted by adopting a plurality of groups of paths to improve the adjustment range of the current; the unidirectional silicon controlled rectifier U1 in the overvoltage protection module is controlled to exceed a standard voltage output path, and a resistor R9 and a resistor R8 form series voltage division to divide the generated high voltage, so that the normal operation of equipment also protects the safety of components.

Drawings

Fig. 1 is a circuit diagram of the module of the present invention.

Fig. 2 is a circuit diagram of the power generation control module of the present invention.

Fig. 3 is a circuit diagram of the current limiting module of the present invention.

Fig. 4 is a circuit diagram of the overcurrent control module of the present invention.

Fig. 5 is a circuit diagram of the overvoltage protection module of the present invention.

Fig. 6 is a circuit diagram of the conversion output module of the present invention.

Detailed Description

Referring to fig. 1 to 6, a current limiting fuse overvoltage protection circuit includes: the power generation control module comprises a generator tail end inductor Lg, a resistor Rg, an impact generator Va, an impact generator Vb, an impact generator Vc, a Switch, a capacitor C1 and a zinc oxide arrester MOA 1.

The current limiting module comprises a resistor R1, a triode Q1, a resistor R2, a diode D2, a capacitor C2, a resistor R4, a diode D1, a variable resistor RV1, a capacitor C3, a resistor R3, a triode Q2, a resistor R5, a diode D3 and a variable resistor RV 2.

The overcurrent control module comprises a resistor R6, a triode Q3, a resistor R7 and a diode D4.

The overvoltage protection module comprises a diode D5, a one-way thyristor U1, a resistor R8, a resistor R9 and a capacitor C4.

The conversion output module comprises a generator head end inductor Lt, a capacitor Cb, a zinc oxide arrester MOA2, a transformer Tr, a test fuse TF, a phase modulation resistor Rs, a capacitor Cs and a fuse equivalent nonlinear resistor ENM.

A pin 1, a pin 2 and a pin 3 of the tail end inductor Lg of the generator in the power generation control module are all connected with one end of a resistor Rg; the other end of the resistor Rg is connected with a ground wire GND; the tail end inductor Lg pin 6 of the generator is connected with one end of an impact generator Va; the tail end inductor Lg pin 5 of the generator is connected with one end Vb of the impact generator; the tail end inductor Lg pin 4 of the generator is connected with one end of an impact generator Vc; the other end of the impulse generator Va is respectively connected with a Switch pin 1, a zinc oxide arrester MOA1 pin 1 and a pin 6; the other end of the impulse generator Vb is connected with a Switch pin 2, a zinc oxide arrester MOA1 pin 2 and a pin 3 respectively; the other end of the impulse generator Vc is respectively connected with a Switch pin 3, a zinc oxide arrester MOA1 pin 4 and a pin 5; the Switch pin 6 is connected with the positive terminal of a capacitor C1.

One end of the resistor R1 in the current limiting module is connected with the negative end of the capacitor C1; the other end of the resistor R1 is connected with the emitter terminal of the triode Q1; the base terminal of the triode Q1 is connected with one end of a resistor R2; the collector terminal of the triode Q1 is connected with the positive terminal of a diode D1; the other end of the resistor R2 is respectively connected with one end of a capacitor C2 and the positive end of a diode D2; the other end of the capacitor C2 is connected with pin 1 of a variable resistor RV 1; the negative end of the diode D2 is respectively connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of a variable resistor RV2, a collector end of a triode Q2 and a ground wire GND; the other end of the resistor R4 is connected with the other end of the capacitor C3; the negative end of the diode D1 is respectively connected with one end of a resistor R3, the base end of a triode Q2 and one end of a resistor R5; the pin 2 of the variable resistor RV1 is respectively connected with the other end of the resistor R3 and the emitter terminal of the triode Q2; the other end of the resistor R5 is connected with the positive end of a diode D3; the negative terminal of the diode D3 is connected with pin 1 of the variable resistor RV 2.

One end of the resistor R6 in the overcurrent control module is respectively connected with the cathode end of the diode D4, and the other end of the resistor R5 is connected with the anode end of the diode D3; the other end of the resistor R6 is connected with the emitter terminal of the triode Q3; the base end of the triode Q3 is respectively connected with the positive end of a diode D4 and one end of a resistor R7; the other end of the resistor R7 is connected with the cathode end of the diode D2 and is connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND respectively.

The negative end of the diode D5 in the overvoltage protection module is respectively connected with the positive end of a one-way thyristor U1 and the collector end of a triode Q3; the positive end of the diode D5 is connected with one end of a resistor R8; the other end of the resistor R8 is respectively connected with one end of a resistor R9, one end of a capacitor C4 and a pin 1 of a one-way thyristor U1; the other end of the resistor R9 is respectively connected with the other end of the capacitor C4, the negative end of the unidirectional silicon controlled rectifier U1 and the other end of the resistor R7 are respectively connected with the negative end of the diode D2, and respectively connected with one end of the resistor R4, one end of the capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND.

A pin 5 of the generator head end inductor Lt in the conversion output module is respectively connected with a negative electrode end of a diode D5, a positive electrode end of a one-way thyristor U1 and a collector end of a triode Q3; a pin 4 of a head-end inductor Lt of the generator is respectively connected with a pin 3 of a transformer Tr, a pin 1 of a capacitor Cb and one end of a zinc oxide arrester MOA 2; the lead pin 3 of the generator head end inductor Lt is connected with the lead pin 2 of the capacitor Cb, and the lead pin 3 of the generator head end inductor Lt is fixed with the middle section of the zinc oxide arrester MOA2 in a non-contact manner; a pin 2 of a head end inductor Lt of the generator is connected with a pin 5 of a Switch; the lead 1 of the inductance Lt at the head end of the generator is respectively connected with Cb silver paste of a capacitor, the other end of a zinc oxide arrester MOA2 and a lead 4 of a transformer Tr; a pin 6 of a generator head end inductor Lt is connected with a pin 4 of a Switch; the transformer Tr pin 1 is respectively connected with one end of a phase modulation resistor Rs, one end of a test fuse TF and one end of a fuse equivalent nonlinear resistor ENM; the pin 2 of the transformer Tr is respectively connected with one end of a capacitor Cs, the other end of a test fuse TF, the other end of a fuse equivalent nonlinear resistor ENM and a ground wire GND; the other end of the capacitor Cs is connected with the other end of the phase modulation resistor Rs; and the pin 4, the pin 5 and the pin 6 of the capacitor Cb are all connected with a ground wire GND.

The working principle is as follows: the three-phase impulse generator outputs alternating voltage, an inductor Lg at the tail end of the generator filters interference signals of each output end of the three-phase impulse generator, instantaneous high voltage can be generated to keep the output voltage stable, a resistor Rg is grounded to protect the lightning protection and leakage protection effects of the generator, a zinc oxide arrester MOA1 is connected with the output end of the three-phase impulse generator, the current of the arrester flowing through the normal working voltage is extremely small by utilizing the good nonlinear volt-ampere characteristic of zinc oxide, the resistor is reduced when overvoltage acts, overvoltage energy is released, the safety of the output voltage of each phase line is achieved, and a Switch controls the on-off of the voltage output of the three-phase impulse generator; the triode Q1 and the triode Q2 judge the input current value and adopt different output ports for adjustment, the diode D2 limits the flowing direction of the current, the capacitor C2 forms the characteristic of direct alternating current resistance to prevent the connection of wrong voltage, and the variable resistor RV1 and the variable resistor RV2 enable different paths through which the current flows by changing the value of the resistance value to limit the output value of the current; the triode Q3 detects the output current value, and the diode D4 transfers the generated high current to the variable resistor RV2 for regulation again; the unidirectional silicon controlled rectifier U1 controls an output path exceeding the standard voltage, and the resistor R9 and the resistor R8 form a series voltage division characteristic to reduce the output voltage value, so that the output voltage exceeding the standard voltage is regulated; the capacitor Cb blocks direct current from being transmitted in a circuit and is used as the safety of the operation of the voltage protection equipment for the instant starting of the generator, the phase modulation resistor Rs adjusts the resistance value transmitted between phase lines, the capacitor Cs is used as a coupling circuit and allows alternating current voltage to be transmitted and output, and the fuse equivalent nonlinear resistor ENM is used for protecting the on-off of output voltage and has the function of limiting current, so that the safety of the circuit is improved.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be modified to perform various equivalent transformations, which all belong to the protection scope of the present invention.

Claims

1. A current-limiting fuse overvoltage protection circuit, comprising: the power generation control module is provided with a generator tail end inductor Lg for filtering interference signals of each output end of a three-phase impact generator, so that the stability of output voltage can be maintained under the action of instantaneous high voltage, and a resistor Rg is grounded to protect the generator against lightning stroke and electric leakage; the variable resistor RV1 and the variable resistor RV2 in the current-limiting protection module enable the current flowing paths to be different by changing the resistance value so as to limit the current value; a triode Q3 in the overcurrent control module detects the output current value, and a diode D4 transmits the generated high current to a variable resistor RV2 for regulation again; the unidirectional silicon controlled rectifier U1 in the overvoltage protection module controls an output path exceeding standard voltage, and a resistor R9 and a resistor R8 form a series voltage division characteristic to reduce an output voltage value; the capacitor Cb in the conversion output module prevents direct current from being transmitted in a circuit and is used as the safety of the operation of the instantaneous starting voltage protection equipment of the generator; the power generation control module comprises a generator tail end inductor Lg, a resistor Rg, an impact generator Va, an impact generator Vb, an impact generator Vc, a Switch, a capacitor C1 and a zinc oxide arrester MOA1, wherein a pin 1, a pin 2 and a pin 3 of the generator tail end inductor Lg are connected with one end of the resistor Rg; the other end of the resistor Rg is connected with a ground wire GND; the tail end inductor Lg pin 6 of the generator is connected with one end of an impact generator Va; the tail end inductor Lg pin 5 of the generator is connected with one end Vb of the impact generator; the tail end inductor Lg pin 4 of the generator is connected with one end of an impact generator Vc; the other end of the impulse generator Va is respectively connected with a Switch pin 1, a zinc oxide arrester MOA1 pin 1 and a pin 6; the other end of the impulse generator Vb is connected with a Switch pin 2, a zinc oxide arrester MOA1 pin 2 and a pin 3 respectively; the other end of the impulse generator Vc is respectively connected with a Switch pin 3, a zinc oxide arrester MOA1 pin 4 and a pin 5; the Switch pin 6 is connected with the positive terminal of a capacitor C1.

2. The current-limiting fuse overvoltage protection circuit of claim 1, wherein: the current limiting module comprises a resistor R1, a triode Q1, a resistor R2, a diode D2, a capacitor C2, a resistor R4, a diode D1, a variable resistor RV1, a capacitor C3, a resistor R3, a triode Q2, a resistor R5, a diode D3 and a variable resistor RV2, wherein one end of the resistor R1 is connected with the negative end of the capacitor C1; the other end of the resistor R1 is connected with the emitter terminal of the triode Q1; the base terminal of the triode Q1 is connected with one end of a resistor R2; the collector terminal of the triode Q1 is connected with the positive terminal of a diode D1; the other end of the resistor R2 is respectively connected with one end of a capacitor C2 and the positive end of a diode D2; the other end of the capacitor C2 is connected with pin 1 of a variable resistor RV 1; the negative end of the diode D2 is respectively connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of a variable resistor RV2, a collector end of a triode Q2 and a ground wire GND; the other end of the resistor R4 is connected with the other end of the capacitor C3; the negative end of the diode D1 is respectively connected with one end of a resistor R3, the base end of a triode Q2 and one end of a resistor R5; the pin 2 of the variable resistor RV1 is respectively connected with the other end of the resistor R3 and the emitter terminal of the triode Q2; the other end of the resistor R5 is connected with the positive end of a diode D3; the negative terminal of the diode D3 is connected with pin 1 of the variable resistor RV 2.

3. The current-limiting fuse overvoltage protection circuit of claim 1, wherein: the over-current control module comprises a resistor R6, a triode Q3, a resistor R7 and a diode D4, wherein one end of the resistor R6 is connected with the negative end of a diode D4, and the other end of the resistor R5 is connected with the positive end of a diode D3; the other end of the resistor R6 is connected with the emitter terminal of the triode Q3; the base end of the triode Q3 is respectively connected with the positive end of a diode D4 and one end of a resistor R7; the other end of the resistor R7 is connected with the cathode end of the diode D2 and is connected with one end of a resistor R4, one end of a capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND respectively.

4. The current-limiting fuse overvoltage protection circuit of claim 1, wherein: the overvoltage protection module comprises a diode D5, a unidirectional silicon controlled rectifier U1, a resistor R8, a resistor R9 and a capacitor C4, wherein the cathode end of the diode D5 is respectively connected with the anode end of the unidirectional silicon controlled rectifier U1 and the collector end of a triode Q3; the positive end of the diode D5 is connected with one end of a resistor R8; the other end of the resistor R8 is respectively connected with one end of a resistor R9, one end of a capacitor C4 and a pin 1 of a one-way thyristor U1; the other end of the resistor R9 is respectively connected with the other end of the capacitor C4, the negative end of the unidirectional silicon controlled rectifier U1 and the other end of the resistor R7 are respectively connected with the negative end of the diode D2, and respectively connected with one end of the resistor R4, one end of the capacitor C3, a pin 2 and a pin 3 of the variable resistor RV2, a collector end of the triode Q2 and a ground wire GND.

5. The current-limiting fuse overvoltage protection circuit of claim 1, wherein: the conversion output module comprises a generator head end inductor Lt, a capacitor Cb, a zinc oxide arrester MOA2, a transformer Tr, a test fuse TF, a phase modulation resistor Rs, a capacitor Cs and a fuse equivalent nonlinear resistor ENM, wherein a pin 5 of the generator head end inductor Lt is respectively connected with a diode D5 negative electrode end, a one-way thyristor U1 positive electrode end and a triode Q3 collector end; a pin 4 of a head-end inductor Lt of the generator is respectively connected with a pin 3 of a transformer Tr, a pin 1 of a capacitor Cb and one end of a zinc oxide arrester MOA 2; the lead pin 3 of the generator head end inductor Lt is connected with the lead pin 2 of the capacitor Cb, and the lead pin 3 of the generator head end inductor Lt is fixed with the middle section of the zinc oxide arrester MOA2 in a non-contact manner; a pin 2 of a head end inductor Lt of the generator is connected with a pin 5 of a Switch; the lead 1 of the inductance Lt at the head end of the generator is respectively connected with Cb silver paste of a capacitor, the other end of a zinc oxide arrester MOA2 and a lead 4 of a transformer Tr; a pin 6 of a generator head end inductor Lt is connected with a pin 4 of a Switch; the transformer Tr pin 1 is respectively connected with one end of a phase modulation resistor Rs, one end of a test fuse TF and one end of a fuse equivalent nonlinear resistor ENM; the pin 2 of the transformer Tr is respectively connected with one end of a capacitor Cs, the other end of a test fuse TF, the other end of a fuse equivalent nonlinear resistor ENM and a ground wire GND; the other end of the capacitor Cs is connected with the other end of the phase modulation resistor Rs; and the pin 4, the pin 5 and the pin 6 of the capacitor Cb are all connected with a ground wire GND.