The over voltage, low voltage and off-delay operation protection circuit of 555 fridge

Published:2011/5/27 1:11:00 Author:Borg | Keyword: over voltage, low voltage, off-delay operation, protection circuit | From:SeekIC

See as Figure 13-9, this is a over voltage and low voltage sampling circuit consisting of RP1,VT1 and RP2,C2MD2, etc, 1/2 of which is the over or low voltage trigger circuit; and the other 1/2 is the time delay circuit, the delaying time is td=1.1R7C4, which is about 6min. The output is controlled by the relay control circuit, the the off-delay operation is over, the 9-lead outputs a low LEV, and J pulls in, J2-2 and J1-1 closes, and the outlet CZ gets power, then the fridge is working. Figure 13-9 The over voltage, low voltage and off-delay operation protection circuit ofthe fridge



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