Automatic heater controller

Details Automatic heater controller Automatic heater controller

1976-04-30

1978-04-25

Truhe, J. V.

Electric heating

Heating devices

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

219501, H05B 102

Patent

active

040864669

ABSTRACT:
A system for controlling the temperature of the heater element of a heating apparatus by controlling the resistance of the heater element. In a preferred embodiment, the control system monitors a sensing excitation voltage at the heater element for comparison with a reference voltage, preferably at or near the zero-crossings of the heater power source cycle, and thereupon operates so that power to the heater element is always applied and terminated at zero-crossings of power cycle. In a preferred embodiment, the controller is arranged to permit only integral cycles of power to be applied to the heater element to avoid a DC bias buildup and undesirable loading of the power line.

REFERENCES:
patent: 2866067 (1958-12-01), Dolan et al.
patent: 2918558 (1959-12-01), Evans
patent: 3215818 (1965-11-01), Deaton
patent: 3597590 (1971-08-01), Fleming
patent: 3646577 (1972-02-01), Ernst
patent: 3651753 (1972-03-01), Schmidt
patent: 3684454 (1972-08-01), Martin et al.
patent: 3869597 (1975-03-01), Strange

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