AC power supply monitoring circuit composed of the 74HC123

Published:2011/8/14 20:27:00 Author:TaoXi | Keyword: AC, power supply, monitoring | From:SeekIC

The AC power supply monitoring circuit composed of the 74HC123. When the AC power is cut off, the important data that is storaged in the microcomputer might disappear. So we need to add the power transient breaking detection circuit to protect the data in the memorizer. The AC220V voltage is rectified and stabilized to be the +5V ouptut voltage, the voltage can be used as the operating power of the microcomputer, and also it is the operating power of the timer 74HC123 (the 13-pin of the 74HC123 is connected with the microcomputer). When the AC power is normal, the 74HC123 timer will reset to output the high level, the microcomputer operates normally.



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