Sine Wave PWM Inverter using Zero Current Switching at Turn-On

Abstract

In a PWM inverter, the PWM signal with the dead-time is usually used to protect the short-phenomenon of a pair of main switching devices in the inverter. The dead-time causes the waveform distortion in the output voltage and interrupts the high carrier frequency drive of the inverter. In order to solve these problems, a novel PWM inverter is proposed in this paper. The proposed PWM inverter is realized by performing zero current switching at the turn-on of the main switching devices and generates the output voltage without a waveform distortion, although the inverter is driven by the PWM signal with the dead-time. The zero current switching is achieved by connecting in series an inductor and a capacitor between the output terminals of a conventional inverter.