Linearized thermal feedback circuit and temperature controller c

Details Linearized thermal feedback circuit and temperature controller c Linearized thermal feedback circuit and temperature controller c

1989-08-11

1991-06-11

Paschall, M. H.

Electric heating

Heating devices

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

219501, 219505, 219497, 340589, H05B 102

Patent

active

050234315

ABSTRACT:
A temperature controller for a thermal system comprises a linearized feedback loop. A linearized thermistor and heating element are disclosed. A current source adjusts the bias current of the thermistor so that the thermistor voltage is equal to a given voltage when the thermistor is at the desired temperature. When the thermistor is biased in this way, the incremental gain from temperature errors to thermistor voltage errors becomes independent of set point. The heating element includes a power regulator and a power resistor. Because temperature is a linearly related to the power dissipated in the power resistor, square-law circuitry keeps the voltage output of the power regulator linearly related to the square root of the error in the controlled temperature. In other embodiments of the invention, a voltage source adjusts the bias voltage of the thermistor so that the incremental gain from temperature errors to thermistor current errors is independent of set point.

REFERENCES:
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patent: 3784843 (1974-01-01), Gustus
patent: 4232763 (1982-04-01), Goldsmith
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patent: 4516242 (1982-01-01), Yokota
patent: 4554439 (1985-11-01), Cross et al.
patent: 4571728 (1985-07-01), Yoshikawa
patent: 4583228 (1986-04-01), Brown et al.
patent: 4730101 (1988-03-01), Mahon et al.
patent: 4774685 (1985-01-01), Samuels

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