The self-made AC auto regulator circuit

Published:2011/6/25 1:54:00 Author:qqtang | Keyword: self-made, auto regulator | From:SeekIC

Circuit principle: the circuit principle of the regulator is shown in the figure. It consists of sub-circuits of power supply, Vref, voltage sampling comparing and so on. The mains is input from 1-head and 2-head of the transformer, the 3-head and 4-head are the self-coupling regulating heads, the 5-head and 6-head are the power supply of the control circuit and sampling head. When the mains voltage is normal, as the voltage on point C is 3V all the time(i.e it is got from the step-down of R1 and the regulation of DW), both the voltages on A and B are higher than 3V, so both A1 and A2 output low LEV; when the mains power is down, the voltages on 5-head and 6-head are also falling down.



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