Switch status indicator and self tester

Details Switch status indicator and self tester Switch status indicator and self tester

1991-06-04

1992-08-04

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 340641, 324158R, 324158T, G08B 2100

Patent

active

051362805

ABSTRACT:
A solid state relay circuit which utilizes a metal oxide power semiconductor field effect transistor (MOSFET) as an output switching device to switch power to load circuitry by an electrically-isolated coupling arrangement including light emitting diodes (LEDs) and a photodiode array. An arrangement is provided for sensing the current through the LED coupling arrangement to determine when the solid state relay circuit has been operated and, in turn, to operate indicating circuitry. The circuitry may also be utilized as self testing circuitry to check the integrity of components of the input portion of the circuitry.

REFERENCES:
patent: 4581540 (1986-04-01), Guajardo
patent: 4808975 (1989-02-01), Hochhaus et al.
patent: 4884065 (1989-11-01), Crouse et al.
patent: 4990895 (1991-02-01), Juds

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