Patent ID: 7176424

Claim:
An induction-heating cooking apparatus comprising: an inverter unit for performing a switching operation upon receiving a driving pulse, and providing a coil, on which a cooking container is seated, with a current signal; an input voltage detector for detecting an input voltage applied to the inverter; a low-voltage detector for generating a low-voltage decision signal by comparing the input voltage detected by the input voltage detector with a predetermined reference voltage, the low-voltage decision signal being at a first level when the input voltage is lower than the reference voltage, the low-voltage decision signal being at a second level when the input voltage is higher than the reference voltage; a power-level limiter for generating a blocking voltage capable of limiting an output power level to a predetermined power level only when the low-voltage decision signal is at the first level; a microprocessor for generating an output control voltage to allow the inverter unit to generate an output signal suitable for individual output levels; an input voltage compensator for determining a smaller one of the output control voltage and the blocking voltage, and compensating the smaller one of the output control voltage and the blocking voltage according to a variation of the input voltage; and an output controller for generating a frequency control signal capable of controlling a switching operation frequency of the inverter unit to compensate for an output power level according to a compensation component of the input voltage compensator.