H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/08 (2006.01) H02M 1/08 (2006.01) H03K 17/0814 (2006.01)
Patent
CA 2361291
Switching elements of self-quenching function are connected in series to constitute a semiconductor switching device. A snubber circuit comprising the first diode, the first capacitor and a non-linear circuit is connected in parallel to the respective semiconductor switching element. In the snubber circuit, the first diode and the first capacitor are connected in series, and the non-linear circuit is connected in parallel to the first capacitor. The non-linear circuit comprises a impedance element, a Zener diode, and a controlling semiconductor element and draws current through the controlling semiconductor element when applied voltage exceeds the Zener voltage of the Zener diode. Said Zener voltage is larger than and has minimum latitude to divided voltage of the semiconductor element under an accident in power system.
Ito Hiroshi
Iwata Akihiko
Suzuki Akihiro
Mitsubishi Denki Kabushiki Kaisha
Osler Hoskin & Harcourt Llp
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