Circuit arrangement for temperature control of an electric heati

Details Circuit arrangement for temperature control of an electric heati Circuit arrangement for temperature control of an electric heati

1983-01-31

1985-10-08

Paschall, M. H.

Electric heating

Heating devices

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

219499, 219501, 219508, 323246, H05B 102

Patent

active

045462380

ABSTRACT:
The invention relates to a circuit arrangement for controlling the temperature of an electric heating element (10), where the resistance of the element is utilized as a measure of the temperature. When the element is switched on, the current flowing through the element is scanned by a small measuring resistor (16). The voltage drop (U.sub.1) arising over this resistor is compared to a reference value (U.sub.2) for interrupting the effect supply to the element when the element has achieved the desired temperature. Thereafter a weak test current is fed through the element, and a voltage drop (U.sub.3) dependant on the element temperature is compared to an additional reference value (U.sub.4) for again connecting the effect feed when the element temperature has dropped to a predetermined level. By means of the invention, which can be used for the temperature control of, for example, electrically heated car seats, both continuous temperature control and adjustable on/off-hysteresis are obtained.

REFERENCES:
patent: 3789190 (1974-01-01), Orosy et al.
patent: 3903395 (1975-09-01), Hamstra
patent: 3959692 (1976-05-01), Wetzel
patent: 4350876 (1982-09-01), Kubota et al.
patent: 4393300 (1983-07-01), Proctor
Electronic Circuits Manual, p. 939, Copywright 1971, McGraw-Hill, by Marcus.

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