Patent ID: 6936803

Claim:
An inverter circuit of a microwave oven, having a power source and a magnetron MGT, comprising: a high voltage transformer HVT providing a high voltage to the magnetron; a micom outputting a reference voltage preset by a user; an input current detector converting a current provided from the power source to a voltage level; a comparator comparing an output signal of the input current detector with the reference voltage; an integrator increasing or decreasing a level of an output signal of the comparator; a trigger circuit connected to the high voltage transformer, and generating a trigger signal; a PWM controller receiving an output signal of the integrator and output signal of the trigger circuit, for controlling drive of the magnetron; an inverter state detector for receiving the output signal of the input current detector, detecting whether a power provided from the power source is in a normal state and informing the micom about the state of the power.