Bi-directional thyristor circuit with Flip-flop TCA780

Published:2011/8/28 22:52:00 Author:Jessie | Keyword: Bi-directional thyristor, Flip-flop | From:SeekIC

In figure a, integrated flip-flop can output double half cycle +50mA positive current to control the Bi-directional with 700 V rated voltage. Figure b is the reverse controlled current circuit. +15V Power supplycharges for0.22 μF capacitor through 10kΩ resistor, and the chanrging polarity is shown as the chart, then the transistor BC238 stops. When the pulse generated by the integrated trigger is added to the base of transistor by passing two diodes, the transistor is turned on, then the capacitor is grounded by the transistor, so the gate pole on thyristor generates a reverse trigger current to turn it on.



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