Patent ID: 8232777

Claim:
An inverter generator having a generator unit that is driven by an internal combustion engine and generates alternating current, a converter that is connected to the generator unit and converts the alternating current to direct current, an inverter that is connected to the converter and converts the direct current to alternating current with switching elements to supply to an electrical load, an inverter driver that drives the switching elements with a PWM signal generated using a reference sine wave of a desired output voltage waveform and a carrier and makes the alternating current converted in the inverter to the alternating current of a predetermined frequency, comprising: a current detector that detects the alternating current supplied to the electrical load; a gain calculator that calculates gains Gn (n: 2, 3, 4, 5, 6, . . . m) of n-th harmonics of the reference sine wave based on the detected current; and a reference sine wave corrector that corrects the reference sine wave by a sum obtained by the calculated gains Gn.