Hitachi, Ltd.

Akihoko Kanouda

Hideki Miyazaki

Kenichi Onda

Yasuo Matsuda

Kozo Watanabe

The switching of upper and lower switching elements is controlled by respective upper and lower arm driving circuits. Those switching elements are connected in series across a primary d.c. power source and their successive switching generates a drive voltage which is applied to a load. A secondary d.c. power source is connected to the lower arm driving circuit while the upper arm driving circuit is connected to a capacitor connected to the high potential side of the primary d.c. power source. The capacitor is charged from the secondary d.c. power source through a charging circuit. This driving arrangement is particularly applicable to multi-phase driving circuits.

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Hitachi, Japan

Akihoko Kanouda