On-line automatic ac voltage compensation regulator

The utility model relates to an on-line automatic alternating current voltage compensation regulator, which is composed of a voltage reference generation circuit, a voltage sample circuit, an amplitude discrimination circuit, a voltage compensating circuit and a rectification power supply. Having the advantages of simple circuit and stable operation, the utility model adopts a discrete compensating transformer and an autotransformer. When mains supply voltage lies in rated output range, the utility model can automatically lie in a conduction through state, without electric energy consumption and wide voltagetransition; the utility model has no impact harm for electric apparatuses and has no flickerless phenomenal for lighting fixtures. Matched with a delaying output and overvoltage under voltage protection circuit, the utility model can be widely used for on-line automatic alternating current voltage compensation for daily electric apparatuses.