The control circuit of 555 multiple fridge

Published:2011/6/7 4:27:00 Author:Borg | Keyword: control circuit | From:SeekIC

See as Figure 13-11, the control circuit includes sub-circuits of over voltage sampling, low voltage sampling, time delay starter,sound & light alarm device and step-down rectifier, etc. Its main functions are auto protection of over voltage, low voltage and over current, delaying starting of instant power-off, light&sound alarm for faults and so on. IC1(555),C6,R14,RP3 and so on form a time delay starting circuit, when the fridge is power-on, or it is power-off then the power is on again, as the voltage on C6 can not mute, only when RP3 and R14 charge C6 and the LEV of C6 is lower than the 2-lead trigger LEV of 1/3VDD does 555 reset and J pull in.



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