Temperature control system for electric heating apparatus

Details Temperature control system for electric heating apparatus Temperature control system for electric heating apparatus

1979-04-18

1981-07-07

Grimley, Arthur T.

Electric heating

Heating devices

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

219494, 219212, 219491, 219511, H05B 102

Patent

active

042776708

ABSTRACT:
A system comprising a heat generating load, a power control element for controlling power supply to the heat generating load, a temperature detecting circuit for producing an ON signal when the temperature of the load detected by a temperature sensor is lower than a set temperature and an OFF signal when the temperature has reached the set temperature, and a control circuit for feeding on ON or OFF signal to the power control element in response to the signal from the temperature detecting circuit. The control circuit includes a hysteresis control circuit which, once the temperature detecting circuit detects that the temperature has reached the set temperature, permits the power control element to receive OFF signals for a suitable period of time even after the temperature has subsequently lowered to a level at which the signal from the temperature detecting circuit changes to an ON signal. Under the electronic temperature control, the temperature of the article to be heated swings over a predetermined range, giving stimulating and comfortable warmth to the human body.

REFERENCES:
patent: 3543005 (1970-11-01), Kelemen
patent: 3666921 (1972-05-01), Shevlin
patent: 3784843 (1974-01-01), Gustus
patent: 3808402 (1974-04-01), Rea
patent: 3813516 (1974-05-01), Kudsi et al.
patent: 3819904 (1974-06-01), Novak
patent: 3858141 (1974-12-01), Lackey
patent: 4138607 (1979-02-01), Engelmen

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