Asymmetrical PWM Technique with Fundamental Voltage Control and Harmonic Voltage Elimnation in AC Choppers

비대칭형 PWM 교류쵸퍼의 기본파 전압제어 및 고조파 전압제거

Optimal Asymmetrical Pulse-width Modulated (APWM) technique for ac chopper is proposed which can improve the input power factor and eliminate the harmonics of output voltage up to a specified order, and also enables linear control of the fundamental component of the output voltage. The PWM switching patterns at the specified phase angle are obtained by Newton-Raphson method and theoretical comparisons are made with other PWM and APWM technique.