Regulator circuit for control of heat output of a heating element
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United States of America Patent
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-
Dec 16, 1986
Grant Date -
N/A
app pub date -
Feb 13, 1984
filing date -
Feb 17, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A regulator circuit for controlling the heat output of a heating element adapted to be switched on and off by a semiconductor switch energized by a zero crossing switch having cycle group control, whereby a sensor signal derived from the sensed temperature is supplied to the zero crossing switch. In order to avoid an overriding of the control or operating temperature in the heating phase and to improve the accuracy of the temperature control, a secondary control voltage is derived from the sensor voltage according to the rate of rise and drop of the sensor voltage which in the heat phase the switch-off of the heating element is reset to lower temperatures depending on the secondary control voltage and in the cooling phase the switch-on of the heating element is reset to higher temperatures depending on the secondary control voltage.
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