CN2747777Y

CN2747777Y - Fast and stable and two-way controllable silicon trigering circuit

Info

Publication number: CN2747777Y
Application number: CN 200420110357
Authority: CN
Inventors: 郭灿; 黄永庆
Original assignee: XIRUI ELECTRONIC EQUIPMENT CO Ltd SHANGHAI
Current assignee: XIRUI ELECTRONIC EQUIPMENT CO Ltd SHANGHAI
Priority date: 2004-11-26
Filing date: 2004-11-26
Publication date: 2005-12-21
Anticipated expiration: 2014-11-26

Abstract

The utility model relates to a fast and stable and two-way controllable silicon triggering circuit, comprising a circuit composed of resistors, capacitors, diodes, and controllable silicon. The utility model is characterized in that: a generating circuit of square wave pulse of alternating current composed of a rectifying full-bridge D1 and an MOS switching tube Q2 is connected with an isolation driving circuit of the MOS switching tube composed of a D2, a C3, an R4, an R6, an R7, and a U1; a 15V voltage stabilizing diode D2 and a capacitor C3 mutually connected in parallel are connected in series with the auxiliary side of upper two way low voltage optical couplings; the A point voltage of the pulse generating circuit plus the trigger electrode of the controllable silicon by a d4, a Q2, a d2, and a C2; as a consequence the MOS switching tube Q2 is triggered. The utility model has the advantages that: by isolating of the optical coupling, a TTL electric level whose drive capability is over 5MA can reliably trigger a bidirectional controllable silicon and a bidirectional controllable silicon module; trigger time-delay is within 10uS, and the control circuit can be interfered. By adopting conventional elements in the market, the utility model can easily realize the circuit and can be operate stably and reliably, which can solve trigger problem that the bidirectional controllable silicon and the bidirectional controllable silicon module in the application of digital control system.

Description

The bidirectional triode thyristor circuits for triggering of fast and stable

One, technical field:

The utility model is applicable to the bidirectional triode thyristor circuit that all need accurate conducting, has adapted to the high speed development of present Numeric Control Technology, for high-precision power control provides new approach.The utility model provides very fast triggering speed (triggering time-delay in 10uS) and bigger trigger current (greater than 2A), can trigger the bidirectional triode thyristor module reliably.

Two, background technology:

1. the most frequently used thyristor gating circuit adopts bidirectional diode to realize (as Fig. 1), by charging, the discharge time definite silicon controlled angle of flow of resistance to electric capacity, this circuits for triggering can't accurately trigger controllable silicon, and are not suitable for numerical control system.

2. also has a kind of circuit (as Fig. 2) that passes through the triggering bidirectional triode thyristor of pulse transformer in addition, the former limit drive circuit more complicated of sort circuit pulse transformer, the pulse transformer volume is big, but also has the problem that needs independent power supply and drive pulse waveform to handle.

Three, summary of the invention:

The utility model provides a kind of quick, stable bidirectional triode thyristor circuits for triggering.The utility model is to realize like this, a kind of bidirectional triode thyristor circuits for triggering of fast and stable, comprise resistance, electric capacity, diode, the circuit that controllable silicon is formed, it is characterized in that: ac square wave pulse generation circuit and D2 that rectification full-bridge D1 and MOS switching tube Q2 form, C3, R4, R6, R7, the MOS switching tube isolated drive circuit that U1 forms connects, 15V voltage stabilizing didoe D2 and capacitor C 3 secondary that is serially connected in two-way low pressure optocoupler in parallel each other, pulse generation circuit A point voltage, through d4, Q2, d2, C2 is added to the silicon controlled trigger electrode, thereby triggers MOS switching tube Q2.Between the driving stage of MOS switching tube and grid, connect resistance R 7.Impulse output circuit is made up of C2, R3 element in parallel each other.

The utility model has the advantages that: by light-coupled isolation, the Transistor-Transistor Logic level that driving force surpasses 5MA just can trigger bidirectional triode thyristor and bidirectional triode thyristor module reliably, triggers time-delay in 10uS, and can not produce interference to control circuit.The utility model adopts the common element in market, circuit realize easily and working stability reliable, solved bidirectional triode thyristor and the bidirectional triode thyristor module triggering problem in numerical control system is used.

Four, description of drawings:

Accompanying drawing 1 is the thyristor gating circuit schematic diagram that adopts bidirectional diode;

Accompanying drawing 2 is the thyristor gating circuit schematic diagrams that adopt isolating transformer;

Accompanying drawing 3 is circuits for triggering schematic diagrams of the present utility model.

Five, embodiment:

With reference to the accompanying drawings, the utility model is elaborated.

1. the ac square wave pulse generation circuit of rectification full-bridge D1 and MOS switching tube Q2 composition converts to and sinusoidal wave ac square wave pulse in the same way by the direct current square-wave pulse of rectification full-bridge with the generation of MOS switching tube.When the waveform of ordering as A was sinusoidal wave last half-wave, the A point voltage was added to the silicon controlled trigger electrode through d1, Q2, d3, C2, thus the triggering controllable silicon.When the waveform of ordering as A was sinusoidal wave following half-wave, the A point voltage was added to the silicon controlled trigger electrode through d4, Q2, d2, C2, thereby triggers controllable silicon.

2. the MOS switching tube isolated drive circuit of forming by D2, C3, R4, R6, R7, U1.This circuit most critical be to guarantee that the low pressure optocoupler works safely and reliably.The secondary of general low pressure optocoupler is withstand voltage about 30V, and the reliable driving voltage of MOS switching tube is 12V, so this circuit adopts a 15V voltage stabilizing didoe D2 to limit the secondary ceiling voltage of optocoupler.In addition, the conducting of MOS switching tube needs a stable voltage, so adopt C3 to store a stable voltage.When the not conducting of secondary of optocoupler, by R4 C3 is charged after the alternating voltage process D1 rectification, when the secondary conducting of optocoupler, the C3 stored voltage is added on the driving stage of MOS switching tube through the secondary of R6 and optocoupler, thereby allows the conducting of MOS switching tube.Because have an electrode capacitance between the driving stage of MOS switching tube and the grid, this circuit discharges to this electrode capacitance by R7, the assurance optical coupling secondary edges is closed and is had no progeny, and the MOS switching tube in time turn-offs.

3. the impulse output circuit of forming by C2, R3.According to the characteristic of electric capacity, can pass through the higher pulse of frequency, square-wave pulse can be converted to spike, prevent the silicon controlled false triggering.The effect of R3 is returned capacitor C 3 charge circuit is provided except to the C2 discharge.

The utility model also can be formed practical circuit with digital-control circuit and bidirectional triode thyristor module, such as the accurate digital control source of welding current.

Claims

1. the bidirectional triode thyristor circuits for triggering of a fast and stable, comprise the circuit that resistance, electric capacity, diode, controllable silicon are formed, it is characterized in that: rectification full-bridge D1 is connected with the MOS switching tube isolated drive circuit that D2, C3, R4, R6, R7, U1 form with the ac square wave pulse generation circuit that MOS switching tube Q2 forms, 15V voltage stabilizing didoe D2 and capacitor C 3 secondary that is serially connected in two-way low pressure optocoupler in parallel each other, pulse generation circuit A point voltage is added to the silicon controlled trigger electrode through d4, Q2, d2, C2, thereby triggers MOS switching tube Q2.

2. the bidirectional triode thyristor circuits for triggering of fast and stable according to claim 1 is characterized in that: connect resistance R 7 between the driving stage of MOS switching tube and grid.

3. the bidirectional triode thyristor circuits for triggering of fast and stable according to claim 1 and 2 is characterized in that: impulse output circuit is made up of C2, R3 element in parallel each other.