TY - JOUR
T1 - Hybrid Three-Level and Half-Bridge DC-DC Converter with Reduced Circulating Loss and Output Filter Inductance
AU - Guo, Zhiqiang
AU - Sha, Deshang
AU - Liao, Xiaozhong
N1 - Publisher Copyright:
© 1986-2012 IEEE.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - A hybrid three-level (TL) and half-bridge (HB) dc-dc converter is proposed in this paper. The TL dc-dc converter and HB converter have their own transformers, respectively. Compared with conventional TL dc-dc converters, the proposed one has no additional switch at the primary side of the transformer, where the TL converter shares the lagging switches with the HB converter. In order to reduce the circulating current in the primary side, a blocking capacitor is used to reset the primary winding current of the TL converter. Moreover, the rectifier stage is composed of four diodes in the center-tap rectification, forcing the circulating current at the primary side to stay zero during the freewheeling period. The magnetizing inductor of the HB transformer can extend the zero voltage switching operation range of the lagging switches even at light loads. Furthermore, the proposed converter can reduce the output filter inductance. Due to the advantages mentioned above, the efficiency of the converter is improved dramatically. The features and design guidelines of the proposed converter are given in the paper. Finally, the performance of the converter is verified by a 1-kW experimental prototype.
AB - A hybrid three-level (TL) and half-bridge (HB) dc-dc converter is proposed in this paper. The TL dc-dc converter and HB converter have their own transformers, respectively. Compared with conventional TL dc-dc converters, the proposed one has no additional switch at the primary side of the transformer, where the TL converter shares the lagging switches with the HB converter. In order to reduce the circulating current in the primary side, a blocking capacitor is used to reset the primary winding current of the TL converter. Moreover, the rectifier stage is composed of four diodes in the center-tap rectification, forcing the circulating current at the primary side to stay zero during the freewheeling period. The magnetizing inductor of the HB transformer can extend the zero voltage switching operation range of the lagging switches even at light loads. Furthermore, the proposed converter can reduce the output filter inductance. Due to the advantages mentioned above, the efficiency of the converter is improved dramatically. The features and design guidelines of the proposed converter are given in the paper. Finally, the performance of the converter is verified by a 1-kW experimental prototype.
KW - Zero voltage switching
KW - phase shift
KW - reduced circulating current
KW - three level
UR - https://www.scopus.com/pages/publications/84940540708
U2 - 10.1109/TPEL.2015.2394783
DO - 10.1109/TPEL.2015.2394783
M3 - Article
AN - SCOPUS:84940540708
SN - 0885-8993
VL - 30
SP - 6628
EP - 6638
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 12
M1 - 7017562
ER -