Temperature limiting arrangement for a glass-ceramic cooktop app

Details Temperature limiting arrangement for a glass-ceramic cooktop app Temperature limiting arrangement for a glass-ceramic cooktop app

1987-01-05

1988-04-26

Shaw, Clifford C.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219494, 219452, 219459, H05B 374

Patent

active

047406640

ABSTRACT:
An improved power control system for a glas-ceramic cooktop appliance of the type having at least one radiant heating unit disposed beneath the glass-ceramic cooking surface, and a user actuable input keyboard to enable the user to select one of a plurality of power settings for the heating unit. The control system monitors the glass-ceramic temperature and the rate of change of the glass-ceramic temperature to detect abnormal thermal load conditions on the glass-ceramic cooking surface. Upon detection of an abnormal load condition, the power level applied to the heating unit is lowered as a function of the sensed glass-ceramic temperature, the temperature rate of change, and the user selected power setting, to limit the temperature of the glass-ceramic cooking surface so as to avoid damage by excessive temperatures resulting from the abnormal thermal load conditions on the cooking surface.

REFERENCES:
patent: 3710076 (1973-01-01), Frazier
patent: 3885128 (1975-05-01), Dills
patent: 4237368 (1980-12-01), Welch
patent: 4394564 (1983-07-01), Dills
patent: 4492336 (1985-01-01), Takata
patent: 4493980 (1985-01-01), Payne et al.
patent: 4493981 (1985-01-01), Payne

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