Bi-directional Thyristor-composed AC Voltage Regulation Circuit

Published:2011/5/17 8:07:00 Author:Joyce | Keyword: Bi-directional Thyristor-composed, AC, Voltage Regulation | From:SeekIC

As shown in the graph below, the circuit uses to control heaterload RL (resistance wire). The trigger circuit uses UJT relaxation oscillators. It issupplied after the AC power supply is rectified via rectifier bridge and sliced into trapezoidal DC via resistance R1 and stabilivolt VZ .Output of SJU goes to the bi-directional thyristor door gate circuit after being coupled by pulse transformer. If you want to control the speed of DC motor M,you can connect the bi-directional thyristor and the motor in parallel according to the dotted line in the graph. In this way, it can absorb the overvoltage of the bidirectional thyristor, which is caused by the discharge of inductive load.



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