Electric heating unit with alternately heated surface areas

Details Electric heating unit with alternately heated surface areas Electric heating unit with alternately heated surface areas

1992-09-14

1995-03-07

Reynolds, Bruce A.

Electric heating

Heating devices

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

219446, 219510, H05B 102, H05B 368, F24C 706

Patent

active

053960475

ABSTRACT:
A heating unit (1) for a cooking point has an outer heater (3) and an inner heater (4) located concentrically for separately heating an associated surface area (13, 14) of the overall heating surface (2). The two heaters (3, 4) can be differently regulated such that supplied power is periodically switched over and distributed in very short, but variable time intervals in a continuously alternating manner to the two heaters (3, 4). Switching over takes place in the passage of the alternating current characteristic through the zero line. Thus, without influencing a clicking rate, there can be a random power distribution on at least two surface areas (13, 14) of the same heating surface (2) and a high efficiency with a relatively simple control (10).

REFERENCES:
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patent: 4282422 (1981-08-01), Payne et al.
patent: 4394564 (1983-07-01), Dills
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patent: 4697068 (1987-09-01), Schreder
patent: 4740664 (1988-04-01), Payne et al.
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patent: 4836138 (1989-06-01), Robinson et al.
patent: 5001328 (1991-03-01), Schreder et al.
patent: 5043559 (1991-08-01), Scott
patent: 5227610 (1993-07-01), Schultheis et al.
patent: 5270519 (1993-12-01), Higgins

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