| 摘要 |
PURPOSE: A microwave oven switching circuit is provided to reduce production cost by reducing the number of switches. CONSTITUTION: A microwave oven switching circuit is composed of a convection heater(124), a convection fan motor(118), and a high voltage transformer(130). The microwave oven switching circuit comprises a first switch, a second switch, and a third switch. In the first switch, common terminal is connected to a live terminal and a normal open contact is connected to a first live terminal of the high voltage transformer and the one end of the convection heater, a top heater, and a convection motor. The first switch becomes normal open in case of the close of the door and becomes normal close in case of the open of the door. The second switch is connected to the first neutral terminal of the high voltage transformer and turns on or off according to the control signal of a controller assembly. The third switch is connected to the normal close contact of the first switch and becomes normal open in case of the close of the door and becomes the normal close in case of the open of the door. |
