High-accuracy temperature control with heat resistance compensat

Details High-accuracy temperature control with heat resistance compensat High-accuracy temperature control with heat resistance compensat

1978-04-05

1980-11-25

Envall, Jr., Roy N.

Electric heating

Heating devices

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

219501, 323 75N, 323 68, H05B 102

Patent

active

042360641

ABSTRACT:
In a temperature control having a heating element and a temperature sensor for sensing the temperature of an object being heated by the heating element and providing signals effective to control electric energy to be supplied to the heating element, there is provided compensator means for compensating for a variation in the temperature of the object which may be caused by heat resistance and other factors while transmitting heat from the heating element to the object. The temperature of the object is equivalent to a desired one without any influences of the heat resistance. In one preferred form, an operational amplifier having two input terminals is provided one connected to the temperature sensor such as a thermistor and the other connected to a reference potential representative of the desired temperature. An output terminal of the operational amplifier is connected to the heating element. A feedback loop is interposed between the output terminal and the reference input terminal of the operational amplifier for heat resistance compensation.

REFERENCES:
patent: 3553429 (1971-01-01), Nelson
patent: 3755688 (1973-08-01), Hohler
patent: 3789190 (1974-01-01), Orosy etal.
patent: 3831003 (1974-08-01), Foerster
patent: 4007684 (1977-02-01), Takano et al.
patent: 4079331 (1978-03-01), Pinckaers et al.

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