Control circuit

Details Control circuit Control circuit

1981-09-16

1984-08-21

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219494, 323245, H05B 102

Patent

active

044671822

ABSTRACT:
A system for controlling the temperature at a location which is heated by a heater. The heater is intermittently energized by a source of electrical power in response to control signals from a temperature control circuit. The temperature control circuit includes a comparator-amplifier having one input coupled to a sensed temperature signal. The other input to the comparator-amplifier is a set point temperature level. The sensed temperature signal is produced by a bridge circuit including a temperature sensor at the location which is being heated. The comparator-amplifier includes a feedback network to establish a pulse output of a certain frequency when the two inputs are equal. In order to expand the operating band of the comparator-amplifier, an a-c voltage is introduced superimposed on the set point input. Over the operating band the output pulses from the comparator-amplifier are inversely proportional to the sensed temperature signal, and these pulses are used to control the application of electrical power to the heater.

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patent: 4314143 (1982-02-01), Bilstad
patent: 4317985 (1982-03-01), Wilson

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