Patent ID: 6153869
Filing Date: 2000-11-28
Classification: H05B

Abstract:
An AC/DC type microwave oven comprising:a rotatable inverter which inverts a DC power source to an AC power source by means of a rotational force;a high voltage transformer which receives a common power source or an AC power inverted by the rotatable inverter and outputs a higher voltage;a magnetron which is driven by the high voltage outputted from the high voltage transformer and radiates a microwave; anda power control unit for sensing a signal from a power selecting key and preventing the AC and DC power sources from being simultaneously inputted, whereinthe rotatable inverter comprises a motor generating the rotational force, a commutator driven by the motor and a plurality of brushes which are, respectively, contacted with the outer surface of the commutator, andthe commutator comprises a cylindrical body made of an insulating material, and conductive parts which are divided into an even-number by non-conductive parts, respectively having a desired width, whereby the two brushes which are adjacent to each other are simultaneously contacted with one side of the conductive parts.