Delay-start arrangement for a microwave oven

Details Delay-start arrangement for a microwave oven Delay-start arrangement for a microwave oven

1980-11-28

1982-08-17

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

219 1055C, 361194, H05B 668

Patent

active

043451357

ABSTRACT:
A circuit for turning on the constantly energized loads in a microwave oven in response to the initial energization of the magnetron to begin the cooking operation. The circuit includes a delay start relay having a relay coil and a first normally closed relay switch connected in series with a magnetron switching element across a source to respond to the initial turn-on of the magnetron by the switching element. The relay coil also controls a second normally open relay switch connected to close, in response to energization of the relay, a current path including at least one constantly energized microwave oven load. The second relay switch also closes a holding current path for the relay coil to maintain it in an energized condition during the remainder of the cooking cycle. The first relay switch opens after the second relay switch has closed to electrically isolate the relay coil from the switching device. At the end of the cooking cycle a main power switch is opened in response to a signal from the electronic control system to terminate the cooking operation and to reset the delay start relay.

REFERENCES:
patent: 3407306 (1968-10-01), Huntzinger
patent: 3860910 (1975-01-01), Hudson
patent: 3962611 (1976-06-01), Miller
patent: 4011428 (1977-03-01), Fosnough et al.
patent: 4027208 (1977-05-01), Look
patent: 4096542 (1978-06-01), Pappas et al.
patent: 4121079 (1978-10-01), Harmon
patent: 4177369 (1979-12-01), Fritts
patent: 4190756 (1980-02-01), Foerstner

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