CN203434852U - An isolation driving circuit used for a gapless lightning impulse current or voltage generator - Google Patents

Abstract

The utility model relates to an isolation driving circuit used for a gapless lightning impulse current or voltage generator. In the circuit, the rear end of a bias resistor R and the signal output end of a single chip microcomputer are respectively connected with two input ends of a photoelectric coupler B. An output end of the photoelectric coupler B is connected with the front end of a bias resistor R1. The rear end of the bias resistor R1 is connected with the collector electrode of a triode T2. A signal circuit is isolated from a grid driving circuit by the photoelectric coupler. Therefore, the width of on-off time is not limited and signal transmission speed is effectively increased. In a driving loop circuit, an output stage employs a complementary circuit to reduce the internal resistance of a driving source, and fastens the turn-off process of an IGBT. Therefore, a problem of liable interference among various control signal loop circuits is prevented and the probability of mutual conductance is decreased.

Description

Be applied to the isolated drive circuit of gapless lightning impulse current or voltage generator

Technical field

The utility model relates to a kind of lightning impulse current or voltage generation circuit, is specifically related to a kind of isolated drive circuit that is applied to gapless lightning impulse current or voltage generator.

Background technology

The dependence of tradition lightning impulse voltage generator loop punctures air and comes the mode efficiency of conduction current low, and poor anti jamming capability is controlled difficulty large, often occurs the malfunction of air balls gap or tripping situation.Ball-gap discharge has dispersiveness, affected by atmospheric conditions, dust, sphere state etc., therefore with switching device, replace ball discharge gap, can improve the service behaviour of lightning impulse voltage generator, realize the control of flexible and convenient, in a lot of tests, be significant, Fig. 1 is the principle assumption diagram of novel impact voltage source.

R is protective resistance; T is transformer; C is for impacting capacitor; D is rectifier; R ₁～R _nfor charging resistor; r _t1～r _tnfor every grade of discharge resistance; r _f1～r _fnfor every grade of wavefront resistance; Z _xfor the impedance of high pressure test product; D ₁～D _nfor controllable silicon; VT ₁～VT _nfor IGBT; G ₀～G _ncontrol signal for controllable silicon and IGBT.

IGBT electrical device application is at present very extensive, but also less in high-tension application, application IGBT replaces the novel impact voltage source of the atmospherical discharges ball gap of conventional impact voltage generator, solved the difficult control of conventional impact voltage generator discharge voltage waveform, high energy consumption, the defect that low-repetition-frequency and switch life are short, have without malfunction, easily control, operating frequency is high, the advantages such as drive circuit power is little, can be applicable to the high voltage test of modern super extra-high voltage equipment, but be faced with high pressure not under equipotential IGBT drive the protection problem of signal and control loop.

In the course of work of novel impact voltage source, when impacting electric capacity and fill string while putting, IGBTD ₀with IGBTD ₁～D _ntwo signal controlling that adopt respectively, the upper current potential of each IGBT is very high, and signal circuit easily causes interference each other.Due to IGBTD ₁～D _nfor same signal source is controlled, IGBTD at different levels in discharge process ₁～D _npotential difference is larger, to IGBTD ₁～D _nn control loop between Insulation Problems also to consider.

Utility model content

The purpose of this utility model is to provide a kind of isolated drive circuit that is applied to gapless lightning impulse current or voltage generator, solve current gapless lightning impulse current or voltage generator, the problem of interference and mutual conductance is easily caused in each control signal loop each other.

For solving above-mentioned technical problem, the utility model by the following technical solutions:

Be applied to an isolated drive circuit for gapless lightning impulse current or voltage generator, comprise photoelectrical coupler B, biasing resistor R, biasing resistor R ₁, biasing resistor R _b, biasing resistor R _c, biasing resistor R _g, triode T ₁, triode T ₂with triode T ₃;

The rear end of described biasing resistor R and single-chip microcomputer signal output part are connected to respectively two inputs of photoelectrical coupler B;

An output of described photoelectrical coupler B is connected to biasing resistor R ₁front end, biasing resistor R ₁rear end be connected to triode T ₂collector electrode;

Another output of photoelectrical coupler B is connected to triode T ₁base stage, triode T ₁collector electrode by biasing resistor R _cwith biasing resistor R ₁rear end, triode T ₁emitter be connected to triode T ₃emitter;

Described triode T ₂base stage and triode T ₃base stage be connected and pass through biasing resistor R _bbe connected to triode T ₁collector electrode, described triode T ₂emitter and triode T ₃collector electrode be connected and pass through biasing resistor R _gbe connected to and control controllable silicon D ₀the control signal output G of conducting ₀;

Front end connection+5V the level of described biasing resistor R, described triode T ₂collector electrode connection+15V level, described triode T ₃collector electrode connection-10V level.

Compared with prior art, the beneficial effects of the utility model are: adopt optocoupler that signal circuit and gate driver circuit are isolated, to the not restriction of make-and-break time width, effectively improved signaling rate, drive output stage in loop to adopt the form of complementary circuit to reduce the internal resistance of drive source, accelerate the turn off process of IGBT simultaneously, avoided each control signal loop easily to cause each other the problem of interference, and reduced the probability of mutual conductance.

Accompanying drawing explanation

Fig. 1 is the connection diagram of the gapless lightning impulse voltage generator of controllable silicon formation.

Fig. 2 is a kind of isolated drive circuit connection layout that is applied to gapless lightning impulse current or voltage generator of the utility model.

Fig. 3 be the utility model while being applied to gapless lightning impulse current or voltage generator each other be related to schematic diagram.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

Fig. 2 shows an a kind of embodiment who is applied to the isolated drive circuit of gapless lightning impulse current or voltage generator of the utility model: a kind of isolated drive circuit that is applied to gapless lightning impulse current or voltage generator, comprises photoelectrical coupler B, biasing resistor R, biasing resistor R ₁, biasing resistor R _b, biasing resistor R _c, biasing resistor R _g, triode T ₁, triode T ₂with triode T ₃; The rear end of described biasing resistor R and single-chip microcomputer signal output part are connected to respectively two inputs of photoelectrical coupler B; An output of described photoelectrical coupler B is connected to biasing resistor R ₁front end, biasing resistor R ₁rear end be connected to triode T ₂collector electrode; Another output of photoelectrical coupler B is connected to triode T ₁base stage, triode T ₁collector electrode by biasing resistor R _cwith biasing resistor R ₁rear end, triode T ₁emitter be connected to triode T ₃emitter; Described triode T ₂base stage and triode T ₃base stage be connected and pass through biasing resistor R _bbe connected to triode T ₁collector electrode, described triode T ₂emitter and triode T ₃collector electrode be connected and pass through biasing resistor R _gbe connected to and control controllable silicon D ₀the control signal output G of conducting ₀; Front end connection+5V the level of described biasing resistor R, described triode T ₂collector electrode connection+15V level, described triode T ₃collector electrode connection-10V level.

When single-chip microcomputer signal becomes low level by high level, photoelectrical coupler B output signal, T ₁, T ₂, T ₃conducting, G ₀output control signal, D ₀conducting, power supply starts impact capacitor chargings at different levels.When single-chip microcomputer signal becomes high level by low level, photoelectrical coupler B stops output signal, T ₁, T ₂, T ₃disconnect G ₀stop exporting control signal, D ₀disconnect, power supply completes impact capacitor chargings at different levels

Fig. 3 shows the isolated drive circuit structure that is applied to gapless lightning impulse current or voltage generator at multichannel the utility model, R wherein, R ₁₁～R _1n, R _b1～R _bn, R _c1～R _cn, R _g1～R _gnfor biasing resistor, B ₁～B _nfor photoelectrical coupler, T ₁₁～T _1n, T ₂₁～T _2n, T ₃₁～T _3nfor triode, the insulation board of each controlled stage ensures not breakdown between control loops at different levels.When single-chip microcomputer signal becomes low level by high level, photoelectrical coupler B ₁～B _noutput signal, T ₁₁～T _1n, T ₂₁～T _2n, T ₃₁～T _3nconducting, G ₁～G _noutput control signal, D ₁～D _nconducting, impact capacitances in series at different levels are discharged to test product.If produced, impact all-wave, D ₁～D _nkeep being conducting to impact capacitor discharge completes always; If produce to impact, cut ripple, when single-chip microcomputer signal becomes high level by low level, photoelectrical coupler B ₁～B _nnon-output signal, T ₁₁～T _1n, T ₂₁～T _2n, T ₃₁～T _3ndisconnect G ₁～G _nstop exporting control signal, D ₁～D _ndisconnect, impact electric capacity at different levels stops electric discharge.

Claims (1)

1. an isolated drive circuit that is applied to gapless lightning impulse current or voltage generator, is characterized in that: comprise photoelectrical coupler B, biasing resistor R, biasing resistor R ₁, biasing resistor R _b, biasing resistor R _c, biasing resistor R _g, triode T ₁, triode T ₂with triode T ₃;

The rear end of described biasing resistor R and single-chip microcomputer signal output part are connected to respectively two inputs of photoelectrical coupler B;

An output of described photoelectrical coupler B is connected to biasing resistor R ₁front end, biasing resistor R ₁rear end be connected to triode T ₂collector electrode;

Another output of photoelectrical coupler B is connected to triode T ₁base stage, triode T ₁collector electrode by biasing resistor R _cwith biasing resistor R ₁rear end, triode T ₁emitter be connected to triode T ₃emitter;

Described triode T ₂base stage and triode T ₃base stage be connected and pass through biasing resistor R _bbe connected to triode T ₁collector electrode, described triode T ₂emitter and triode T ₃collector electrode be connected and pass through biasing resistor R _gbe connected to and control controllable silicon D ₀the control signal output G of conducting ₀;

Front end connection+5V the level of described biasing resistor R, described triode T ₂collector electrode connection+15V level, described triode T ₃collector electrode connection-10V level.

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