555 automatic AC voltage stabilizer circuit

Published:2011/6/1 2:20:00 Author:TaoXi | Keyword: 555, automatic, AC, voltage stabilizer | From:SeekIC

As the figure 15-9 shows, the voltage stabilizer circuit is composed of the voltage stabilizer part and protection part. When the input AC voltage is in the range of 160V～250V, the output voltage will be 220+/-10%, when the output voltage is more than 250V, the circuit will cut off the load automaticly; when the outage happens, the protector will automatic delay about six minutes, then turns on the power. The two same composite amplifier is composed of the VT1, VT2, VT3, VT4 and some capacitance resistance elements. Their input signals were taken from the different contacts of the self-coupling transformer, after the rectification and pressure separate, they add to the base electrodes of the VT1 and VT3. When the input voltage is lower than 190V, the J1, J2 are not action.



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