변조율이 큰 전압형 컨버터의 PWM 변조방법

This paper presents PWM method which modulates two third period only during one cycle of power converter. This method is compared with the convention! sinusoidal modulation method applying to the power converter with large capacity necessitating low switching frequency. The presented modulation method enables to reduce power semiconductor rating, minimize switching loss, and improve the current wave form.