Mitsubishi Electric Corporation

Shota Saito

Hitoshi Uemura

Yumie Kitajima

Keisuke Nakamoto

A first member of a first semiconductor module and a second member of a second semiconductor module are disposed adjacent to each other along a crossing line segment crossing a longitudinal direction of the first semiconductor module as seen in a plan view. The first member is provided with a first circuit. The second member is provided with a second circuit. The first circuit does not drive when the second circuit is driving. The second circuit does not drive when the first circuit is driving.

Power conversion device

A plurality of gate driver units () respectively drives a plurality of semiconductor switching devices (SW,SW) connected in parallel. A control circuit () controls the plurality of gate driver units (). Each gate driver unit () includes a gate driver () supplying a gate voltage to a gate of the corresponding semiconductor switching device (SW,SW), and a potential difference measuring unit () measuring a potential difference (Va) arising due to wiring inductance on an emitter side of the corresponding semiconductor switching device (SW,SW) for each cycle of an output frequency. The control circuit () adjusts the gate voltage (VGE) supplied by the gate driver () of each gate driver unit () such that the potential differences (Va) of the plurality of semiconductor switching devices (SW,SW) in turn-on or turn-off switching operation become same as each other.

Gate driving circuit

A switching element (A) is connected in parallel to a load (L). A switching element (B) is connected between the switching element (A) and a grounding point. The drive circuit () drives the switching element (A). The drive circuit () drives the switching element (B). Upon detecting a load short circuit, a load short circuit detection circuit () outputs a first signal. A timer () outputs a second signal after a lapse of a predetermined time after inputting the first signal. Upon receiving the first signal, the drive circuit () turns ON the switching element (A). Upon receiving the second signal, the drive circuit () turns OFF the switching element (B).

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Fukuoka, Japan

Shota Saito