H - Electricity – 05 – B
Patent
H - Electricity
05
B
341/15
H05B 3/02 (2006.01) G05D 23/24 (2006.01) H05B 1/00 (2006.01)
Patent
CA 1197301
ABSTRACT The controller of the present invention regulates the flow of current through a resistive heating element by computing the predicted resistance Rhot 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 = IRhot 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 vari- able 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.
410564
Strehlow Robert J.
Tamura Paul S.
Oximetrix Inc.
Smart & Biggar
LandOfFree
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