Method and apparatus for controlling an electric heater

Details Method and apparatus for controlling an electric heater Method and apparatus for controlling an electric heater

1998-05-01

1999-10-05

Walberg, Teresa

Electric heating

Heating devices

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

21944819, H05B 368

Patent

active

059618671

ABSTRACT:
An electric heater (1) arranged beneath a glass-ceramic cook top (2) is controlled with the aid of a temperature sensor (7) for monitoring temperature at or adjacent to the glass-ceramic cook top. The sensor provides an electrical output as a function of temperature and permits monitoring, in time controlled manner, temperature at or adjacent to the glass-ceramic cook top. In a first stage the temperature of the glass-ceramic cook top (2) is permitted to exceed a predetermined continuous safe level (Y) for up to a predetermined maximum time period (X, W.sub.2, W) and such that a predetermined temporary safe level (Z) of temperature, in excess of the predetermined continuous safe level (Y), is not exceeded. In a second stage the heater (1) is regulated in accordance with the monitored temperature to achieve a selected temperature of the glass-ceramic cook top in a range up to the predetermined continuous safe level (Y) of temperature.

REFERENCES:
patent: 4447710 (1984-05-01), McWilliams
patent: 5001329 (1991-03-01), Shimomura et al.
patent: 5113170 (1992-05-01), Goessler et al.
patent: 5310993 (1994-05-01), McWilliams et al.
patent: 5420398 (1995-05-01), Petri et al.
patent: 5489764 (1996-02-01), Mannuss et al.
Search Report Jul. 30, 1997.

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