Optically toggled latch-free normally off switch

Details Optically toggled latch-free normally off switch Optically toggled latch-free normally off switch

1981-12-07

1983-07-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

043956378

ABSTRACT:
A normally-OFF switch includes a transistor branch path and a parallel pair of oppositely poled thyristor branch paths to protect against voltage surges. To minimize latching-on of the thyristors as a result of voltage surges, the thyristor branch paths including light emitting diodes which light up when excess current flows in the thyristor branch paths and actuate a photodiode array which biases the transistor path to conduction to divert excess current from the thyristor path.

REFERENCES:
patent: 4275308 (1981-06-01), Hamamsy
patent: 4303831 (1981-12-01), Hamamsy
patent: 4307298 (1981-12-01), Hamamsy et al.

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