Abstract: A power conversion device includes a power converter to output AC power by converting input DC power, an electric leakage detector to detect electric leakage in a power supply line through which the AC power output by the power converter flows when the AC power is being output by the power converter, and a power conversion controller configured to control power conversion of the power converter. The power conversion controller is configured to stop power conversion operation of the power converter based on a detection result of the electric leakage detector.

Abstract: A power conversion device includes a power converter, a relay, and a welding detector. The welding detector includes a first resistor connected to a terminal of the relay on a first side, a capacitor and a second resistor, both of which are connected to a terminal of the relay on a second side, an application unit to apply an inspection signal to the relay via the capacitor and the second resistor, and a determiner connected between the capacitor and the second resistor, the determiner detecting a signal based on application of the inspection signal by the application unit to determine whether or not the relay is welded.

Abstract: A power conversion device includes an electric leakage detector, a failure determiner to output a pulse current to reproduce, in a simulated manner, electric leakage, and a power conversion controller configured to control power conversion. The power conversion controller is configured to determine a failure of the electric leakage detector depending on whether or not a pulse width of a pulse current as an electric leakage detection signal acquired by the electric leakage detector is within a predetermined range.

Abstract: A power conversion device includes a power converter to output AC power by converting input DC power, an electric leakage detector to detect electric leakage in a power supply line through which the AC power output by the power converter flows when the AC power is being output by the power converter, and a power conversion controller configured to control power conversion of the power converter. The power conversion controller is configured to stop power conversion operation of the power converter based on a detection result of the electric leakage detector.

Abstract: A power conversion device includes a power converter, a relay, and a welding detector. The welding detector includes a first resistor connected to a terminal of the relay on a first side, a capacitor and a second resistor, both of which are connected to a terminal of the relay on a second side, an application unit to apply an inspection signal to the relay via the capacitor and the second resistor, and a determiner connected between the capacitor and the second resistor, the determiner detecting a signal based on application of the inspection signal by the application unit to determine whether or not the relay is welded.