Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Reissue Patent
2005-05-17
2005-05-17
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
C327S438000, C327S582000
Reissue Patent
active
RE038734
ABSTRACT:
An inductance in a path (R1) from a gate electrode (3G) of a GTO (3) through a gate driver (4) and a node (13) to a cathode electrode (3K) is determined so that a turn-off gain may be not more than 1. At a turn-off, a main current (IA) is entirely commutated from the gate electrode (3G) towards the node (13) through the gate driver (4) in a direction reverse to a turn-off control current (IG) A peak voltage suppressing circuit (5) clamps an anode-cathode voltage (VA-K) which rises on, to a prescribed voltage value for a prescribed time. This prevents losses caused by a snubber circuit. Commutation of a main current to the gate prevents locally concentrating in the cathode side of the semiconductor switching element, to thereby increase the turn off capability of the semiconductor switching element. Further, this prevents or reduces dissipation of large amount produced by a discharge of the electric charges from a snubber capacitor. Thus, reduction in dissipation and in size of the whole apparatus can be achieved.
REFERENCES:
patent: 5237225 (1993-08-01), Gruning
patent: 5493247 (1996-02-01), Gruning
Conference Record of the 1986 IEEE Industry Applications Society Annual Meeting Part I Papers Presented at the Twenty-First Annual Meeting, Radisson Hotel, Denver, CO Sep. 28-Oct. 3, Sponsored by the IEEE Industry Applications Society.
Kurachi Kazuhiro
Yamamoto Masanori
Mitsubishi Denki & Kabushiki Kaisha
Zweizig Jeffrey
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