| Summary: | 碩士 === 國立宜蘭大學 === 電機工程學系碩士班 === 98 === A novel three-phase soft switching rectifier is proposed in this thesis. A low cost four main switches and four auxiliary switches power converter configuration of the three-phase rectifier is proposed. The reduction in the number of main switches can also increase the reliability because the control circuits and the auxiliary circuits are thereby reduced to two sets. All main switches in the proposed rectifier operate at zero voltage switching (ZVS) turned-on. Also, the auxiliary switches operate at zero current switching (ZCS) turned-on and turned-off. Moreover, to improve the voltage imbalance between the split capacitors, a control method is presented to eliminate the voltage imbalance. A small-signal model is derived and a feed-forward control is presented to achieve almost zero output impedance and zero audio susceptibility. Some simulation and experimental results of the proposed soft switching rectifier, rated 400 W and operated at 40 kHz, are presented for verification.
Keywords: zero-voltage-switching (ZVS), zero-current- switching (ZCS), three phase rectifier
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