Patent ID: 6114678
Filing Date: 2000-09-05
Classification: H05B

Abstract:
A device of detecting an abnormal state of a microwave oven having relays either applying or cutting off a power, a high voltage transformer receiving a voltage through the relays and increasing the voltage to a given level, and a magnetron driven by the voltage increased by the high voltage transformer and generating a high frequency to a cooking chamber, the device comprising:a voltage sensing part connected between the high voltage transformer and the magnetron to sense a voltage applied to both terminals of the magnetron; anda control part receiving the sensed voltage between both the terminals of the magnetron from the voltage sensing part, determining an abnormal state when an unloaded state exists where nothing is in the cooking chamber or an overheated state of the magnetron or the cooking chamber exists, and when it is determined that the microwave oven is in the abnormal state, turning off the relays to stop the operation of the magnetron.