Isolated solid state relay

Details Isolated solid state relay Isolated solid state relay

1991-02-19

1992-12-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361 56, 361111, H02H 324

Patent

active

051684179

ABSTRACT:
A solid state relay includes a protective input stage at its control terminals to isolate the control circuit from line voltage or line current in the event of relay failure. The protective circuit includes a series combination of a voltage responsive element and a current responsive element. The current responsive element connects to the input or control terminal of the solid state relay and the voltage responsive element connects to ground. The interconnection of the current responsive element and voltage responsive element serves as the device input terminal for connection to a control circuit. In the event of relay failure, the voltage responsive element reacts to the increased voltage by providing conductivity, by way of the current responsive element, between the solid state relay input terminal and ground. The increased current flow opens the current responsive element and thereby protects the control circuit against the possibility of damage caused by current flow originating from the relay line voltage terminals.

REFERENCES:
patent: 3678291 (1972-07-01), Coe
patent: 4979071 (1990-12-01), Ito et al.

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