| 摘要 |
PURPOSE: A fire safety control method for a microwave oven is provided to detect the fire and to perform the safe control by using the thermistor placed within the furnace and the thermostat mounted to the air outlet. CONSTITUTION: The fire safety control method for a microwave oven includes the steps of measuring the voltage applied to the thermostat, detecting the temperature of the furnace, monitoring the change ratio of the temperature of the furnace, cutting off the power to the heater when a rapid change of temperature occurs. The microwave oven comprises a magnetron for generating the microwave, a fan for inhaling the air, a plurality of halogen lamps for generating the high heat, a thermostat mounted to the air outlet and connected in series with the halogen lamps, a relay to turn on or to turn off the halogen lamps, and a microcomputer to control the overall operation. The microcomputer determines whether the thermostat is off-operation mode(100), detects the fire(130) by using the thermostat if the thermostat is off-operation mode, and cuts off the relay(140) when fire is detected. The microcomputer measures the temperature by using the thermistor(110) when the thermostat is on-operation mode, and monitors the change of temperature. If the measured temperature is over 2.2 V and the changed voltage for 6 seconds is over 0.42 V, the microcomputer determines this state as a fire(120).
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