Half-Sine Wave Modulation Technique a New Method for Generating Variable Frequency Sinusoidal Current

In this paper, a new method for generating variable-frequency sinusoidal current is proposed. This method is based on the series resonant inverter and can be used in adjustable frequency drives. In the proposed method, each half-cycle of the fundamental frequency consists of a number of half-sine waves with different amplitudes and widths, which are arranged side-by-side. In this method, switching losses and output harmonic content can be significantly reduced. The circuit needed to generate this waveform can be implemented by a modified series resonant inverter with a number of capacitors. A performance comparison of the proposed method and the conventional sinusoidal pulsewidth modulation technique is presented to evaluate improvements in the method.