Thermal control apparatus and method

Details Thermal control apparatus and method Thermal control apparatus and method

1994-10-13

1997-05-13

Paschall, Mark H.

Electric heating

Heating devices

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

219209, 219501, 219505, 374 1, 36457103, H05B 102

Patent

active

056289294

ABSTRACT:
Embodiments described herein provide methods and apparatuses for thermally controlling an instrument. According to one embodiment, an apparatus includes a heater and a source of electrical energy electrically connected with the heater for energizing the heater to produce thermal energy. A driver is electrically connected with the heater and the source of electrical energy for controlling application of electrical energy to the heater. A sensor is electrically connected with the heater for detecting thermal energy produced by the heater responsive to the electrical energy from the source of electrical energy. A controller is electrically connected with the driver and the sensor for controlling production of thermal energy by the heater responsive to electrical energy from the source of electrical energy. Another embodiment provides a method in which a heater is electrically connected with a relatively reduced thermal energy reference resistor. An amplifier operatively associated with the heater slews to a relatively reduced thermal energy value which is recorded in memory. An algorithm controlling the heater is updated. The heater is electrically connected with a detector for sensing thermal energy produced by the heater. The amplifier slews to a value associated with the detector.

REFERENCES:
patent: 3699800 (1972-10-01), Waldron
patent: 3890836 (1975-06-01), McKenzie et al.
patent: 4041382 (1977-08-01), Washburn
patent: 4209837 (1980-06-01), Brown
patent: 4315413 (1982-02-01), Baker
patent: 4761539 (1988-08-01), Carmean
patent: 4891497 (1990-01-01), Yoshimura
patent: 4901257 (1990-02-01), Chang et al.

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