Solid state optical relay

Details Solid state optical relay Solid state optical relay

1989-04-17

1990-05-08

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

561 90, 561 93, 561101, 523277, 523284, 523300, H02H 308

Patent

active

049243438

ABSTRACT:
A solid-state, four terminal optical relay has a current regulator with two input pins, and an output switch with two output pins. The relay includes an optical isolator assembly so that the current which causes switching of the relay is optically, rather than electrically, transmitted to an output switch driver. The relay includes an internal current overload detect and latch circuit which operates if the relay is switched on into a shorted load, or if a short is switched in across the load while the relay is on. The current overload detect and latch circuit is sufficiently fast to permit the relay to be continuously pulsed into a shorted load without damage to the relay.

REFERENCES:
patent: 4581540 (1986-04-01), Guajardo
patent: 4825330 (1989-04-01), Walchle

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