| 摘要 |
PURPOSE: A circuit for sensing a temperature and a door of a microwave oven is provided to sense an opening/shutting state of the door of the microwave oven and the temperature of a cooling fan of the microwave oven by using only one micro controller port. CONSTITUTION: A circuit for sensing a temperature and a door of a microwave oven includes a door switch(SW11), a first switching element, a second switching element, a thermistor(TH), and a micro controller port. The door switch(SW11) is turned on or off according to an opening state or a shutting state of a door for microwave oven. The first switching element is turned on when the door switch(SW11) is turned on. The second switching element is turned on when the door switch(SW11) is turned off. The thermistor(TH) is connected between the first switching element and the second switching element in order to control an operation of a cooling fan. The micro controller port is connected between the first switching element and the second switching element in order to sense a state of the door for microwave oven and the temperature of the cooling fan.
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