Pure Sinusoidal Output Current-Source Inverter Using New Current Waveform Generation Technique

A novel technique which is able to generate a pure sinusoidal output current waveform for the single-phase current-source inverter is proposed in this paper. The proposed technique incorporates a staircase multilevel current waveform generator and a class-D amplifier-based linear compensating current waveform generator. This linear compensating current is superimposed onto the staircase current waveform in order to reform the output current to a pure sinusoidal waveform. All generated dc link currents are maintained by sensing the load voltage. Therefore, regardless of the load condition, the output current waveform is always constructed on the same number of levels. As a result, the proposed system has efficiency up to 90% and less than 2% output total harmonic distortion without using large output capacitor filter according to computer simulation.