AVR series (electronic formula) single-phase high accuracy full automatic AC voltage stabilizer is composed of autotransformer, relay, automatic control circuit and so on, when electrical network unstable or variation of load, the automatic sampling control circuit discrete sampling control relay, adjusts from the pair transformer's input output number of windings compared to, enables the output voltage to adjust the rated value and to achieve the steady state, has the movement to be keen, the stable property, the peaceful entire province electricity, the handsome appearance, the structure is reasonable, easy to operate, high quality but low price, input voltage scope wide and so on characteristics.Is suitable to the voltage request not high electric appliance.