Optically toggled bidirectional switch

Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means

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Details

361 91, 361100, H02H 900

Patent

active

044245440

ABSTRACT:
An optically toggled bidirectional normally-on switch is provided with protection against bilateral voltage and bidirectional current surges by the inclusion of a pair of oppositely poled thyristors. One version uses a large junction-type field-effect transistor in its main path and a pair of smaller junction-type transistors in the subsidiary path. A photodiode array controls the gate voltage on each of the transistors and turns them off when illuminated. A control node in the subsidiary path is connected to the gates of the SCRs so that excess current in this path turns on the appropriately-poled thyristor to provide an additional shunt path for the current.

REFERENCES:
patent: 3504233 (1970-03-01), Hurtle
patent: 4144477 (1979-03-01), Eaton
patent: 4217618 (1980-08-01), Kellenbenz et al.
patent: 4227098 (1980-10-01), Brown et al.
patent: 4307298 (1981-12-01), El Hamamsy et al.
patent: 4331884 (1982-05-01), Svedberg

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