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This paper deals with a novel pulse width modulation (PWM) switching strategy for a voltage source inverter through carrier modification. The proposed discontinuous sine carrier PWM (DPWM1) method, which uses two modified sine waves, has a better spectral quality and a higher fundamental component. This improved waveform has been derived from the original sine PWM technique through the addition of the 17-percent third-harmonic component to the original sine reference

The paper presents two high-performance singlephase AC chopper circuits which perform AC-AC bidirectional direct conversion; one of them contains resistive loads and the other one is for inductive loads. It includes useful equations for chopper design. The correct functioning is tested by simulation.