The present invention provides an AC-AC automatic voltage regulator in which output voltage and input voltage have the same phase. According to an embodiment of the present invention, the AC-AC automatic voltage regulator comprises: a first back to back switch connecting one side of an input power source and one side of a predetermined inductor; a second back to back switch connecting the one side of the inductor and the other side of the input power source; a third back to back switch connecting the other side of the inductor and the other side of the input power source; a fourth switch connected to the other side of the inductor and one side of a load; and a predetermined capacitor connected to both sides of the load.;COPYRIGHT KIPO 2019
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