Mitsubishi Electric Corporation

Kentaro Shioura

Takeshi Yamamoto

A power conversion apparatus includes a filter capacitor to be charged with electric power fed from a main power source, and a power converter to convert electric power fed via the filter capacitor and feed the converted electric power to a load. The power conversion apparatus further includes a power-source contactor to electrically connect the filter capacitor and the power converter to the main power source or electrically disconnect the filter capacitor and the power converter from the main power source, and a discharging circuit connected in parallel to the filter capacitor. The power conversion apparatus also includes a discharge control circuit to close a discharging contactor included in the discharging circuit after opening of the power-source contactor, and thereby cause the filter capacitor to be discharged.

Power conversion device for suppressing flow of short-circuit current to discharging resistor

A power conversion device includes power conversion units connected to a shared power source. The power conversion units each include a contactor, a power converter, and a unit controller. A contactor controller closes or opens the contactor. A sensor measures a value of at least one of input current or output current of the power converter. The unit controller determines presence or absence of a failure of the power conversion units based on the measured value of the sensor, and sends a determination result to another unit controller.

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Tokyo, Japan

Kentaro Shioura