| 摘要 |
PURPOSE: A circuit for reducing noises of microwave oven controls a driving of a fan motor with a low noise after completing a cooking operation of a microwave oven, and removes moisture inside of a cooking chamber. CONSTITUTION: A noise reduction circuit of a microwave oven includes first and second AC lines(L1,L2) whose one end are connected to an input terminal of the AC power, and the other end are connected to a high voltage transformer(HVT) via a door switch(SW1,SW2), a monitor switch, a main relay(RY1), and a power relay(RY2). The noise reduction circuit further includes a lamp(L) and fan motor(FM) which are turned on or off by a main relay. The noise reduction circuit includes a fan motor driver(10) for independently driving the fan motor about the lamp and each load. A microcomputer(11) controls an on/off operation of the fan motor driver. Thereby, a unnecessary power-consumption is prevented, and a reliability of the product.
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