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A new PWM technique is proposed for a threephase sin-wave PWM inverter. The pulse width is decided to produce a sin-wave output voltage by numerical calculation based on a geometrical technique. The accuracy of output voltage and the harmonics in an output voltage waveform are discussed as compared with the conventional triangulation method. Further, a modified method is introduced for a PWM inverter with fluctuating input voltage. The validity of the proposed method for the PWM inverter is verified in an experiment using a microprocessor-based control system.

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