Apparatus and method for simultaneously deactivating series-conn

Details Apparatus and method for simultaneously deactivating series-conn Apparatus and method for simultaneously deactivating series-conn

1996-04-08

1998-01-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327261, 327269, 327441, H03K 1772

Patent

active

057125872

ABSTRACT:
An apparatus for use in the simultaneous deactivation of a set of series-connected switching devices includes gate command control logic to generate a gate command signal for application to a selected switching device of the set of series-connected switching devices. A command compensation circuit processes the gate command signal. The command compensation circuit includes a time differential measurement module that forms a time differential signal indicative of the time from the previous turn-off of the selected switching device and the previous turn-off of the last switching device in the set of series-connected switching devices. A time difference processing module of the command compensation circuit process the time differential signal and creates a delay signal. A delay module of the command compensation circuit delays the gate command signal in response to the delay signal. Each switching device of the set of series-connected switching devices includes a command compensation circuit. Consequently, the generated delay signals cause the series-connected switching devices to turn-off simultaneously.

REFERENCES:
patent: 3551739 (1970-12-01), Bossi
patent: 3567972 (1971-03-01), Faust
patent: 4540933 (1985-09-01), Teuling
patent: 4639851 (1987-01-01), Johnson
patent: 5093630 (1992-03-01), Sato
patent: 5616970 (1997-04-01), Dittrich

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