| 摘要 |
<p>A microwave oven comprises a heating chamber (1) in which to put food to be heated, a high frequency heating circuit for supplying high frequency energy to the heating chamber, two thermal heaters (2, 3) each provided in the upper and lower areas of the heating chamber, a switching circuit (12) for selecting the high frequency heating circuit or the thermal heaters, a first switching circuit (18) for permitting intermittent power supply to the high frequency heating circuit when the high frequency heating circuit is selected by the swithcing circuit, a second switching circuit (22) connected in parallel with the first switching circuit so as to provide a bypass of the first switching circuit when closed, a first contact mounted in the first switching circuit to permit intermittent power supply to one of the two thermal heaters in the heating chamber, and a second contact mounted in the second switching circuit to provide a bypass of the first contact. </p> |
