Device for monitoring the state of an electric switch or an electric relay
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United States of America Patent
Stats
-
Dec 1, 1987
Grant Date -
N/A
app pub date -
May 28, 1986
filing date -
May 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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