CN85103691A

CN85103691A - Thyristor gating circuit

Info

Publication number: CN85103691A
Application number: CN 85103691
Authority: CN
Inventors: 龙飞
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-05-13
Filing date: 1985-05-13
Publication date: 1986-11-12

Abstract

A kind of thyristor gating circuit cooperates with controllable silicon, and the scalable alternating voltage plays the purpose of automatic stabilisation voltage, stabling current simultaneously.Can be applied in the equipment of automatic stabilisation alternating voltage, alternating current or similar above-mentioned purpose.When being used for voltage stabilizing, voltage stabilized range is bigger, no matter how high input ac voltage is, as long as components and parts are withstand voltage, power consumption allows, and stability is constant, and this is that all pressure stabilizing devices all can not be accomplished at present.Cooperate with direct current regulation circuit, be highly suitable for being contained in the electronic equipments such as television set, radio-cassette player, the assurance electronic equipment also can be worked with security and stability in the big area of mains ripple.

Description

Thyristor gating circuit

At present, controllable silicon is mainly used in the adjusting alternating voltage, and the circuits for triggering that are used for voltage stabilizing are more complicated all, the ripple voltage height after voltage stabilizing, and voltage stabilized range is little.Circuit of the present invention is simple, cooperates with controllable silicon, not only can regulation voltage, can also the automatic stabilisation alternating voltage, and voltage stabilized range is bigger.Under the situation that the withstand voltage power consumption of components and parts allows, input ac voltage is high again, and stable output voltage is also constant.This is that present any pressure stabilizing device all can not be accomplished.With the ingenious combination of direct current regulation circuit, ripple voltage is low, has overcome use silicon controlled shortcoming, in electronic equipment, can replace saturation core regulator fully, and performance also is better than saturation core regulator.The present invention can also cooperate with controllable silicon, makes stabling current by oneself.

Accompanying drawing one is controllable silicon constant current constant voltage pressure regulation circuits for triggering schematic diagrames.Among the figure, capacitor (1) and potentiometer (2) can reach the purpose of pressure regulation, when input voltage changes, because voltage stabilizing didoe (4) both end voltage is constant, and the electric current that flows through it changes, cause that sample resistance (3) both end voltage ensues variation, the charging voltage at the voltage of this variation and capacitor (1) two ends relatively after, cause the transistor (5) of positive-negative-positive conduction polarity and transistor (6) the accumulation positive feedback effect of NPN type conduction polarity, trigger controllable silicon and shift to an earlier date or turn on delay, reach the purpose of automatic steady current voltage stabilizing.

If the location swap resistance (3) and voltage stabilizing didoe (4) becomes accompanying drawing two.These circuits for triggering cooperate with controllable silicon, can reach the purpose of voltage regulation of voltage regulation and do not have the effect of current stabilization.

Requirement of the present invention is that voltage stabilizing didoe (4) should have excellent characteristic, and current-limiting resistance (10) should be got different numerical value according to voltage stabilized range with sample resistance (3).

The present invention and controllable silicon combine neatly, are applied in the ac current regulator voltage stabilizing and similar effect are arranged as exchanging in the equipment such as overcurrent protection, overvoltage protection, over voltage alarm, now for three examples:

Circuit shown in the accompanying drawing three can be to load (R _l) carrying out AC voltage adjusting, the voltage that load is transferred to carries out voltage stabilization and current stabilization automatically.

Circuit can exchange over voltage alarm shown in the accompanying drawing four.

The voltage stabilizing circuit of accompanying drawing five for using in the electronic equipment.Figure five the first half and controllable silicon constitute AC voltage-stabilizing circuit.The inventor did experiment, and when voltage was input as 220 volts, transformer secondary output was output as 18 volts, 12 volts of dc output end voltages, 500 milliamperes of output DC streams.When AC-input voltage when changing for 145 volts to 300 volts, 12 volts of outputs are all constant.Even be higher than 300 volts, 12 volts are also constant.The alternating voltage that dc output end is measured generally all about 2.5 millivolts, is slightly larger than the dc output end alternating voltage (2 millivolts) of no AC voltage-stabilizing circuit.

Claims

1, a kind of thyristor gating circuit is characterized in that adopting this circuits for triggering control thyristor operating angle, make be adjusted to predetermined voltage to the fixed load two ends after, can the automatic stabilisation both end voltage or flow through wherein electric current.

2, by the illustrated thyristor gating circuit of right 1, it is characterized in that the amplifier in the circuits for triggering is connected on the two ends of sample resistance and charging capacitor.

3, a kind of according to the said thyristor gating circuit of claim 1 to 2, voltage stabilizing didoe and sample resistance position can exchange, and can reach the purpose of voltage-regulation voltage-stabilization equally.

4, a kind of according to right 1 to 3 said circuits for triggering, it is characterized in that amplifier in the circuit directly is coupled by the transistor of NPN type conduction polarity and a positive-negative-positive conduction polarity to form.