The protector circuit of 555 air-conditioning

Published:2011/5/29 21:28:00 Author:Borg | Keyword: protector circuit, air-conditioning | From:SeekIC

When the air-conditioner is at the wind gear(or cold gear) and it is on, as the voltage on C2 can not mutate, so 555 is offset, J2 keeps still, J2-2 is off, the compressor gets no power and can't start. When C2 engages in charging by R1, after the delaying time td=1.1R1C2, which is about 3min, the LEV of 6-pin rises to 2/3VDD, and that makes 555 reset, J2 pull in and the compressor gets power. At the moment, J1 pulls in and gets power, J1-1 and J1-4 close, J1-1 and J1-3 cut off, and the 555 is in a compelled reset state, the 3-pin is in a low LEV which makes J2-2 to be connected.



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