TY - JOUR
T1 - A Generalized Current Self-Sharing Strategy in Whole Operating Range for Series Capacitor Buck Converter
AU - Zhao, Lingling
AU - Sun, Min
AU - Xiang, Tianyu
AU - Pan, Siming
AU - Hu, Weihao
AU - Blaabjerg, Frede
PY - 2023/10
Y1 - 2023/10
N2 - In high voltage step-down and high output current applications, such as voltage regulator modules, electric vehicles, and battery chargers, a series capacitor buck converter (SCBC) is a good choice but only in a limited duty cycle range. In this article, a generalized current self-sharing strategy for the multiphase SCBC is proposed, which has the ability to self-sharing current and uniform ultrahigh step-down ratio in the whole operating range. Through unified analysis of switching modes, the principles of charge-balance and volt-second balance are applied to achieve the self-sharing current and unified linear voltage step-down ratio. The master–slave phase shift (Ms–Ps) modulation strategy for four-phase SCBC is proposed to verify the proposed scheme, showing that the converter will have ultrahigh 1/ M -times voltage step-down and sensor-less current self-sharing over the full duty ratio range. Experiment results on 1.8 V/20 A hardware prototype is built to confirm the performance of the proposed strategy.
AB - In high voltage step-down and high output current applications, such as voltage regulator modules, electric vehicles, and battery chargers, a series capacitor buck converter (SCBC) is a good choice but only in a limited duty cycle range. In this article, a generalized current self-sharing strategy for the multiphase SCBC is proposed, which has the ability to self-sharing current and uniform ultrahigh step-down ratio in the whole operating range. Through unified analysis of switching modes, the principles of charge-balance and volt-second balance are applied to achieve the self-sharing current and unified linear voltage step-down ratio. The master–slave phase shift (Ms–Ps) modulation strategy for four-phase SCBC is proposed to verify the proposed scheme, showing that the converter will have ultrahigh 1/ M -times voltage step-down and sensor-less current self-sharing over the full duty ratio range. Experiment results on 1.8 V/20 A hardware prototype is built to confirm the performance of the proposed strategy.
KW - Current sharing
KW - interleaved buck converter (IBC)
KW - low voltage high current
KW - series capacitor buck converter (SCBC)
KW - ultrahigh step-down ratio
UR - http://www.scopus.com/inward/record.url?scp=85168751438&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2023.3306467
DO - 10.1109/JESTPE.2023.3306467
M3 - Journal article
SN - 2168-6777
VL - 11
SP - 5078
EP - 5091
JO - I E E E Journal of Emerging and Selected Topics in Power Electronics
JF - I E E E Journal of Emerging and Selected Topics in Power Electronics
IS - 5
M1 - 10223726
ER -