Temperature control devices

Details Temperature control devices Temperature control devices

1980-02-29

1982-02-16

Rubinson, Gene Z.

Electric heating

Heating devices

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

219494, 219501, 219504, 338 22R, 338 23, H05B 102

Patent

active

043160808

ABSTRACT:
A temperature-controlling circuit including a heating element, a portion of which is shunted by a proportional PTC thermistor having a low rate of charge of resistance with increasing temperature that controls current to the shunted and unshunted portion of the heating element to provide a proportional control of temperature. Additional embodiments are disclosed in which additional circuit elements are employed to further control current through the heating element, and in which a second thermistor connected in series with the shunted portion of the heating element accommodates wide voltage swings.

REFERENCES:
patent: 3299345 (1967-01-01), Gambill
patent: 3584196 (1971-06-01), Kurakawa et al.
patent: 3651308 (1972-03-01), Kurakawa et al.
patent: 3681569 (1972-08-01), Schwarz
patent: 3798413 (1974-03-01), Kahn
patent: 3826924 (1974-07-01), Plough et al.
patent: 3962559 (1976-06-01), Drda et al.
patent: 4024427 (1977-05-01), Belhomme
patent: 4045763 (1977-08-01), Miyamoto et al.

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