Full-wave Rectified Waveform Generation Using Dead-beat Voltage Control for DC-DC Buck Converters to Realize High Efficiency Inverter

This study aims to realize a high efficiency inverter by combining a DC-DC buck converter and unfolding circuit. The DC-DC converter generates a full-wave rectified waveform. The unfolding circuit changes the waveform to an AC sinusoidal waveform. In order to generate a pure AC voltage waveform, the output of the DC-DC converter should be accurately controlled. In this paper, dead-beat voltage control (DBVC) for the accurate full-wave rectified waveform generation is proposed. Simulations and experiments were conducted to validate the proposed method. As a result, it was verified that the proposed DBVC was effective for the accurate full-wave rectified waveform generation. A voltage distortion was observed when the voltage reference was close to zero. In order to suppress the distortion, only the duty after the voltage reference turns to increase is decreased. As the improved results, the distortion can be reduced by setting the decrease ratio of the duty at 0.6. Finally, the AC output waveform with low harmonics was achieved by combining the DC-DC converter and the unfolding circuit.