Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1982-11-17
1984-08-21
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361103, 219501, H02H 720
Patent
active
044673868
ABSTRACT:
A sensor circuit includes a measurement signal generator which includes a sensing element having an impedance which varies in response to changes in a sensed parameter. The sensor circuit also includes a reference signal generator, a comparator and a variable impedance connected in circuit with the measurement signal generator for loading the measurement signal generator. The comparator produces a control signal for activating a control system when the measurement signal has a predetermined relationship to the reference signal. The variable impedance renders the sensor circuit fail-safe. An abnormal (failure) operating condition of the sensor element which would cause the measurement signal to have the predetermined relationship to the reference signal, instead causes the variable impedance to load the measurement signal generator to force it to generate an override measurement signal. The override measurement signal is one which does not have the predetermined relationship to the reference signal whereby the abnormal operation of the sensor element does not activate the control system.
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patent: 3942075 (1976-03-01), Maran et al.
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patent: 4266257 (1981-03-01), Rudich, Jr.
patent: 4281358 (1981-07-01), Plouffe et al.
patent: 4320285 (1982-03-01), Koether
Ochis Robert
RCA Corporation
Salce Patrick R.
Tripoli Joseph S.
Troike Robert L.
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