Charging device

A charging device comprising:

• a rectifier circuit that rectifies an AC voltage supplied from an AC power supply;
• a power factor correction circuit that is connected to an output terminal of the rectifier circuit;
• a capacitor that is connected to a pair of output lines of the power factor correction circuit;
• a DC-DC converter that boosts or steps down an output voltage at the power factor correction circuit to output the output voltage to a battery;
• a voltage detection circuit that is provided between the power factor correction circuit and the DC-DC converter;
• and
• a controller that controls the power factor correction circuit based on a voltage detected by the voltage detection circuit,
• wherein the voltage detection circuit includes an isolation transformer, a switching element, and a voltage detector,
• wherein a primary winding of the isolation transformer and the switching element are connected in series between the pair of output lines of the power factor correction circuit,
• wherein the voltage detector is connected to a secondary winding of the isolation transformer, and
• wherein the voltage detector detects an output voltage at the secondary winding of the isolation transformer while the switching element is turned on.