On-board charger and method for operating the same

Abstract

An on-board charger is configured in an electric vehicle equipped with an on-board battery. The on-board charger includes an AC-DC conversion circuit, an energy storage capacitor, a bidirectional conversion circuit, an AC conversion circuit, and a controller. The AC-DC conversion circuit converts a first AC power to a DC power. The bidirectional conversion circuit bidirectionally converts the DC power to a battery power, thereby charging or discharging the on-board battery according to the battery power. The AC conversion circuit selectively provides a second AC power supply according to either the first AC power or the DC power, and the controller continuously controls the AC conversion circuit to provide the second AC power to a load according to a remaining power in the on-board charger during a maintain time after the first AC power is de-energized.

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