Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1981-09-02
1985-06-11
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219501, 219509, 219506, 364482, 307117, H05B 102
Patent
active
045230846
ABSTRACT:
The controller of the present invention regulates the flow of current through a resistive heating element by computing the predicted resistance R.sub.hot of the heating element at the desired temperature and then adjusting the voltage drop across and current flow through the resistive heating element until the relationship V=IR.sub.hot is satisfied. In an analog embodiment of the present invention, measurement of the voltage drop is obtained from a voltage amplifying circuit connected across the resistive heating element, while a measure of the current flow through the resistive heating element is obtained from a current amplifying circuit connected across a current measuring resistor in series with the resistive heating element. The output of the current amplifying circuit is multiplied by first and second variable gain amplifier circuits to produce a signal output representing the product of the current flow and the predicted resistance at the desired temperature. The signal from the voltage amplifying circuit and the product-representative signal from the two variable gain amplifier circuits are balanced in a control amplifier to produce a control signal having a value which varies as a function of the difference between the voltage-representative signal and the product-representative signal. The control signal is thereafter utilized to adjust the voltage drop across the resistive heating element until the current through the resistive heating element multiplied by the predicted resistance at the desired temperature, i.e., the product-representative signal, equals the voltage drop across the resistive heating element.
REFERENCES:
patent: 3752956 (1973-08-01), Cahill et al.
patent: 3789190 (1974-01-01), Orosy et al.
patent: 4267434 (1981-05-01), Simpson
patent: 4281386 (1981-07-01), Kondow et al.
patent: 4323763 (1982-04-01), Goldsmith
patent: 4363957 (1982-12-01), Tachikawa et al.
Strehlow Robert J.
Tamura Paul S.
Oximetrix, Inc.
Paschall M. H.
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