Device for monitoring the state of an electric switch or an elec

Details Device for monitoring the state of an electric switch or an elec Device for monitoring the state of an electric switch or an elec

1986-05-28

1987-12-01

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Plural switches

307132R, 307132E, 307143, 307571, 324158SC, 361 86, 361 88, H03K 17687

Patent

active

047106450

ABSTRACT:
A device for monitoring the state of a relay comprises an electrical insulation transformer whose secondary winding is connected, through a rectifier, to the output terminals of the relay. The primary winding of the transformer is in series with an oscillator having an impedance greater than that of the primary winding when the relay is closed. A transistor receives a signal from the primary winding and delivers an on-off output signal representing the impedance across the terminals of the relay.

REFERENCES:
patent: 4438356 (1984-03-01), Fleischer
patent: 4634903 (1987-01-01), Montorfano

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