The time delay over-voltage alarm circuit of the AC regulator

Published:2011/6/26 21:50:00 Author:Borg | Keyword: time delay, over-voltage alarm, AC regulator | From:SeekIC

In the figure is the time delay over-voltage alarm circuit of the AC regulator. The alarm consists of the high-voltage time delay circuit, over-voltage detection and alarm circuit, output control circuit and so on. The output circuit consists of the controllable silicon SCR, relay J0 and D7. The high-voltage time-delay circuit is a time delay oscillating circuit composed of 555, R7 and C4. When the AC power supply is on, as the voltage on C4 can't mutate, the 2-pin is in a low LEV and the 555 3-pin is outputting a high LEV, which makes BG1 conducting.



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