Electric heating – Microwave heating – With control system
Patent
1998-08-21
1999-10-26
Leung, Philip H.
Electric heating
Microwave heating
With control system
219715, 219718, 219719, 219757, 99325, H05B 668
Patent
active
059733047
ABSTRACT:
A microwave oven having a silent cooking mode and a method for operating the microwave oven are disclosed. The microwave oven has a magnetron driving section connected to a secondary winding of a high voltage transformer which receives an external power source via a primary winding thereof. A fan motor ventilates a cooking chamber of the microwave oven and a silent cooking mode selecting key selects the silent cooking mode. Voltage dividing section divides the voltage of the external power source. Switching section supplies the external power source to the fan motor at a normal cooking mode and supplies the external power source of which the voltage is divided by the voltage dividing section to the fan motor at the silent cooking mode. Control section controls the switching section in response to a key signal from the silent cooking mode selecting key. Accordingly, when the user selects the silent cooking mode, a noise generated from the fan motor is reduced remarkably. As a result, the user can comfortably cook food at night.
REFERENCES:
patent: 4777575 (1988-10-01), Yamato et al.
patent: 5200589 (1993-04-01), Kim
patent: 5350903 (1994-09-01), Takei
patent: 5498858 (1996-03-01), Jeong
Daewoo Electronics Co. Ltd.
Leung Philip H.
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