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Overvoltage protection circuit with automatic reset

2016-09-21 21:50  
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Overvoltage protection circuit with automatic reset
The circuit mainly includes power supply, trigger start and control, to control load R1 turn on or off power supply through TRIAC ZN6346. Once the AC power voltage is too high, the ○A point's voltage on constant current component 1N5314 is rising, then the unidirectional SCR 2N5O6O turns on and transistor MPS6581 turns off, SCR 2N6239 turns off too, finally, main bi-directional SCR turns off, it can protect load from overvoltage damaging.