G - Physics
05
D
341/110, 341/32
G05D 23/24 (2006.01) G05B 11/28 (2006.01) H05B 1/02 (2006.01)
Patent
CA 1182190
CONTROL CIRCUIT Abstract of the Disclosure 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 responce 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 senor 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 input are equal, In order to pad 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.
411331
Corporation Nordson
Macrae & Co.
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