Patent ID: 9151784
Filing Date: 2015-10-06
Classification: G01R,H02M

Abstract:
1. An AC voltage detecting circuit comprising: a first capacitor including a first electrode configured to connect to one end of an AC power supply, and a second electrode; a second capacitor including a first electrode configured to connect to another end of the AC power supply, and a second electrode; a current-to-voltage converting circuit, which is connected in series between the second electrode of the first capacitor and the second electrode of the second capacitor, and which is connected to a reference potential, wherein the current-to-voltage converting circuit includes a resistor and as AC current passes through the current-to-voltage converting circuit when the AC current returns to the AC power supply, the current-to-voltage converting circuit converts, by the resistor, the AC current output from the AC power supply into a detection AC voltage; and a voltage detecting unit, which detects an AC input voltage of the AC power supply, based on the detection AC voltage;