Abstract
Single-phase buck-boost rectifier with minimized input current distortion is studied in the paper. To sinusoidally waveshape the input current with a near-unity power factor over a wide variety of operating conditions, the output capacitor is operated with voltage reversibility for the supply by arranging the auxiliary diode and power switching device. Then the output voltage is superposed on the input voltage during on-time duration of power switching devices in order to minimize the input current distortion caused by the small input voltage when changing the polarity. The tested setup, using two insulated-gate bipolar transistors (IGBTs) and a microcomputer, is implemented and IGBTs are switched with 20kHz, which is out of the audible band. Moreover, a rigorous state-space analysis is introduced to predict the operation of the rectifier. The experimental and simulated results confirm that the input current can be sinusoidally waveshaped with a near-unity power factor and a satisfactory output voltage regulation can be achieved.
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