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A New Control Method for PWM AC Chopper

A new control method is proposed for PWM ac chopper whcih can have the features of both linear control of the fundamental voltage and complete elimination of the harmonics up to specified order. Through theoretical investigation of the proposed method, it is found that both input and output characteristics can be improved better than those of the conventional methods. Also the newly modified triangular carrier wave is suggested to perform the above features over full control range and to implement the control circuit easily. To evaluate the performances of the proposed PWM method, the comparsion with the conventional PWM technique is made and the exterimental results are suggested.