Mitsubishi Electric Corporation

Naohiko Mitomi

Yasushi Nakayama

Hiroyuki Takagi

Yoshiko Tamada

Junichiro Ishikawa

Kazuhiro Otsu

Yoshitaka Naka

A short-circuit protection circuit for a self-arc-extinguishing type semiconductor element includes a first protection circuit and a second protection circuit. The first protection circuit is configured to reduce a voltage between a control electrode and a first main electrode of the self-arc-extinguishing type semiconductor element when detecting overcurrent flowing between the first main electrode and a second main electrode. The second protection circuit is configured to: detect current flowing in an interconnection adapted to supply the drive voltage; determine, based on the detected current, whether the first protection circuit is in an operating state; and change the drive voltage to turn off the self-arc-extinguishing type semiconductor element when the first protection circuit is in the operating state.

Growing community of inventors

Chiyoda-ku, Japan

Naohiko Mitomi