The power supply outlet circuit of 555 multi-function fridges (2)

Published:2011/5/30 22:58:00 Author:Borg | Keyword: power supply outlet, multi-function fridge | From:SeekIC

See as Figure 13-16, the fridge outlet includes sub-circuits of power-off time delay, over/low voltage warning,over/low voltage adjusting and temperature indication, etc. when mains voltage is higher than 245v or lower than 180v, the output voltage will be adjusted to about 220V; when the power is off, it will buzz. RP1,RP2,F1,F2,F3 and so on consist a over/low/off power detection circuit, IC1 is connected as a Schmidt trigger. When it's over/low/off power, the output terminal of IC1 will be in a low LEV, VT5 is conducting, which makes the oscillator, consisting of IC2,R10,RT and C5, work.



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