Temperature control circuit having series connected fail-safe co

Details Temperature control circuit having series connected fail-safe co Temperature control circuit having series connected fail-safe co

1990-01-29

1991-10-15

Paschall, Mark H.

Electric heating

Heating devices

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

219505, 219497, 323236, 307647, H05B 102

Patent

active

050576690

ABSTRACT:
An improved temperature control circuit having a controller portion with an inhibit input and a temperature responsive circuit portion that includes a resistive portion connected in series with a sensor portion which establishes the control point for the control circuit, the improvement including a semiconductor switch in series with the sensor portion, the semiconductor switch having two electrodes between which a resistor is connected. The resistor is also connected to the inhibit input of the controller to present a signal to inhibit operation of the temperature control circuit when the sensor portion and semiconductor switch is not conducting.

REFERENCES:
patent: 3413438 (1968-11-01), Gardner et al.
patent: 3842243 (1974-10-01), Gregory
patent: 4278872 (1981-07-01), Koether et al.
patent: 4546239 (1985-10-01), Sugimori
patent: 4736091 (1988-04-01), Moe
patent: 4816642 (1989-03-01), Dennison
Motorola Semiconductors, Semiconductor Description Brochure, CA 3059 and CA 3079 (6 pages) (1977).

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