Automatic temperature control device for an electric appliance s

Details Automatic temperature control device for an electric appliance s Automatic temperature control device for an electric appliance s

1981-05-20

1984-11-27

Paschall, M. H.

Electric heating

Heating devices

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

219497, 219501, 219212, 219509, 323235, 307231, H05B 102

Patent

active

044852967

ABSTRACT:
The automatic temperature control device for an electric appliance such as an electric blanket comprises a heater element, a sensor made of a thermosensitive material having an impedance, which changes as the temperature varies, for detecting the temperature of the heater element, switching means for regulating the supply of electric power to the heater element, and a plurality of electric circuits for driving the switching means in response to the output signal from the sensor. The plurality of electric circuits function to prevent the sensor from being polarized and to detect a temperature signal by applying thereto an alternating current, to detect a failure occurring in the electric circuits in synchronism with zero-crossing pulses, and to detect a failure occurring in the switching means, thereby assuring a safe operation of the automatic temperature control device against the occurrence of any failure.

REFERENCES:
patent: 3784843 (1974-01-01), Gustus
patent: 3842243 (1974-10-01), Gregory
patent: 3866587 (1975-02-01), Knapp
patent: 4038519 (1977-07-01), Foucras
patent: 4109134 (1978-08-01), Van-Herten
patent: 4205223 (1980-05-01), Cole
patent: 4272671 (1981-06-01), Hukagawa et al.
patent: 4278873 (1981-07-01), Petrides
patent: 4296312 (1981-10-01), Salem
"Electronic Circuits Manual" copyright 1971, McGraw Hill, p. 492.

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