Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1984-12-13
1987-06-23
Scott, J. R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
323236, 323238, 323245, 361 86, 361103, H02H 504
Patent
active
046757775
ABSTRACT:
A temperature-responsive circuit, for operation with a load-control apparatus having a control input for adjusting the magnitude of power applied to a load from a source, uses: a sensor responsive to the temperature in the vicinity of the load-control apparatus; a subcircuit for converting the temperature sensed by the sensor to the magnitude of an electrical parameter; a subcircuit for providing a reference electrical parameter having a magnitude predeterminately selected to equal the magnitude of the electrical parameter at a maximum desired temperature T.sub.0 ; and a subcircuit for providing a control signal to the control input of the load-control apparatus responsive to a comparison between the electrical parameter and the reference electrical parameter, with the control signal having a magnitude respectively insufficient or sufficient to substantially affect the magnitude of power applied to the load if the magnitude of the electrical parameter is respectively less than or greater than the magnitude of the reference parameter. The load power is proportionally reduced if the magnitude of the electrical parameter exceeds the magnitude of the reference parameter. The gain of a comparator-amplifier may be selected to gradually decrease the power applied to the load to a preselected magnitude when a second temperature T.sub.1, greater than the maximum desired temperature T.sub.0 established by the reference parameter, is sensed by the sensor.
REFERENCES:
patent: 3488573 (1970-01-01), Cavigelli et al.
patent: 4064448 (1977-12-01), Eafock
patent: 4467386 (1984-08-01), Wasson
patent: 4580088 (1986-04-01), Bloomer
Davis Jr. James C.
Gaffin Jeffrey A.
General Electric Company
Krauss Geoffrey H.
Scott J. R.
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