Method and apparatus for a thermistor compensated oven

Details Method and apparatus for a thermistor compensated oven Method and apparatus for a thermistor compensated oven

1974-10-17

1976-07-20

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219505, 307310, 338 23, 338 25, H05B 100

Patent

active

039708187

ABSTRACT:
An oven having a thermistor controlled proportional heating system is compensated for ambient temperature variations by using a second thermistor sensing ambient temperature and connected in series with the control thermistor in an electrical bridge circuit. The control thermistor is mounted within the oven and substantially monitors the oven temperature while the ambient thermistor is located outside the oven and monitors ambient temperature. The electrical bridge circuit produces a temperature control error signal which is amplified and applied to a heater winding which is wrapped around the oven. The ambient thermistor produces a resistance variation in the electrical bridge circuit which modifies the temperature control signal such that a predetermined point inside the oven is held at a constant temperature regardless of any ambient temperature changes.

REFERENCES:
patent: 3007023 (1961-10-01), Johnson et al.
patent: 3028473 (1962-04-01), Dyer et al.
patent: 3252109 (1966-05-01), White
patent: 3838248 (1974-09-01), Uchida

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