cinsisting of 555 single quantitative power supply controller circuit

Published:2011/6/20 8:57:00 Author:Fiona | Keyword: cinsisting of 555, single quantitative power supply controller | From:SeekIC

Load detection circuit is composed of the transformer B,D1,C1,W1 and it is used to measure circuit.Electronic switch is composed of the BG1,DW1 and R1 and it is controlled by testing signal.The regular time of the single stable circuit which is composed of the IC (555) and R3, C4 is td = 1.1R3C4,the parameters of the corresponding time is about four minutes. When the power exceeds the load,the voltage regulator tube DW1 is breakdown,BG1 saturated conducts,555 is set due to the potential of ② pin is low,the high level output by ③ pin makes the SCR conduct,relay J pulls in,contactor J1-1, J2-2 is off,cuts off ~ 220V power supply.



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