Abstract
A novel type of PWM (pulse-width modulated) inverter is proposed, which has five-stepped levels of the output voltage. In this inverter, the waveform of the output voltage has smaller harmonic contents than those of a conventional PWM inverter. A novel PWM technique is analyzed. The PWM pulses included in the waveform of the output voltage are formed by the criterion on the calculation that each area of voltage pulses equals the integrated value of each time-shared area of a reference sinusoidal waveform. This PWM technique for five-stepped PWM inverters is superior to the conventional PWM technique, and the experimental results are verified by calculation using the fast Fourier transform. In addition, relations between the number of PWM pulses and the harmonic contents of the output voltage are described. >
Published Version
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