Method and apparatus for calibration and controlling multiple he

Details Method and apparatus for calibration and controlling multiple he Method and apparatus for calibration and controlling multiple he

1994-01-18

1996-05-28

Voeltz, Emanuel T.

Boots, shoes, and leggings

364477, 219505, 219508, 340501, G12B 1300

Patent

active

055218504

ABSTRACT:
Multiple heaters are calibrated and controlled by a microcomputer, and a multiplexer for this system. The heaters are sequentially sampled and resistance calculated from voltage and current measurements. The operator enters a temperature for the calculated resistance to establish a calibrated resistance value. During run, the computer energizes and samples each heater to calculate its resistance. The calculated resistance if divided by the calibrated resistance to determine a resistance ratio. A look-up table is stored in the computer having resistance ratios for corresponding temperature. The computer compares the calculated ratio to that of the look-up table to determine actual heater temperatures. Based upon heater temperatures, the computer controls energization of the heaters until set points are achieved. Negative temperature coefficient and positive temperature coefficient transistors and semiconductors can be utilized.

REFERENCES:
patent: 5280422 (1994-01-01), Moe et al.

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