Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1978-06-02
1980-12-02
Envall, Jr., Roy N.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
338 25, 338 22R, 219464, 219504, H05B 300
Patent
active
042373689
ABSTRACT:
A glass-ceramic cooktop surface is provided with a temperature sensor integral with the glass ceramic plate of the cooktop. The temperature sensor utilizes the temperature resistance characteristic of the glass ceramic plate as a means of monitoring the temperature of the plate and is formed in the heated areas of the glass-ceramic plate. The sensor comprises pairs of metallized conductive strips fired to the underside of the plate and terminated in a cool region of the plate. A continuity resistor is provided at the termination point of each pair of strips to distinguish between cold glass conditions and a defective sensor. One strip of each pair is connected to a further metallized strip which surrounds the periphery of the glass and forms a common ground for a heating unit control circuit and is also used as a broken glass detector. Each sensor forms one leg of an AC voltage divider and is connected to an associated control circuit. The output of the voltage divider is applied to two voltage comparators having a common output connected to operate a relay to control heater power to the "burners" of the cooktop which may be open coil heaters or film heaters.
REFERENCES:
patent: 2921174 (1960-01-01), Welch
patent: 3477019 (1969-11-01), Hartmann
patent: 3549862 (1970-12-01), Holtkamp et al.
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patent: 3636309 (1972-01-01), Deaton et al.
patent: 3710076 (1973-01-01), Frazier
patent: 3786390 (1974-01-01), Kristen
patent: 3947658 (1976-03-01), Sato et al.
patent: 4092520 (1978-05-01), Holmes et al.
Envall Jr. Roy N.
General Electric Company
Lacomis Bernard J.
Reams Radford M.
Roskoski Bernard
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