TY - GEN
T1 - Enhanced EPS-PSM Hybrid Control of CLLC Resonant Converter with Improved Light-Load Efficiency
AU - Huang, Zitong
AU - Zhang, Xiangjun
AU - Zhao, Yifan
AU - Wang, Yijie
AU - Guan, Yueshi
AU - Xu, Dianguo
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - Pulse frequency modulation (PFM) is the traditional method to drive CLLC resonant converters. However, PFM suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions under light-load conditions. Phase-shift modulation techniques, such as inner phase shift (IPS) modulation, can overcome this challenge. However, more improvements are demanded due to high circulating currents and difficulties in achieving zerovoltage switching (ZVS) in phase-shift modulations. Therefore, this article proposes an optimization for extended phase-shift (EPS) control to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is established to solve time-domain expressions of circuit variables, the voltage gain and root mean square (RMS) values of resonant currents. Finally, based on these analyses, a proper selection of phase-shift values of EPS is determined to achieve higher efficiency of the CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 200V/30.,60 V, 300 W Si-based CLLC resonant converter prototype.
AB - Pulse frequency modulation (PFM) is the traditional method to drive CLLC resonant converters. However, PFM suffers the problems of unsatisfactory voltage regulation and low efficiency under light-load conditions under light-load conditions. Phase-shift modulation techniques, such as inner phase shift (IPS) modulation, can overcome this challenge. However, more improvements are demanded due to high circulating currents and difficulties in achieving zerovoltage switching (ZVS) in phase-shift modulations. Therefore, this article proposes an optimization for extended phase-shift (EPS) control to improve the light-load efficiency. In order to study the relations between phase-shifts of EPS control and converter efficiency, a detailed circuit model is established to solve time-domain expressions of circuit variables, the voltage gain and root mean square (RMS) values of resonant currents. Finally, based on these analyses, a proper selection of phase-shift values of EPS is determined to achieve higher efficiency of the CLLC converter at light-load conditions. The validity of the proposed optimized EPS control is verified on a 200V/30.,60 V, 300 W Si-based CLLC resonant converter prototype.
KW - CLLC resonant converter
KW - efficiency
KW - extended phase-shift (EPS) control
KW - light-load
KW - optimization
UR - https://www.scopus.com/pages/publications/105004172961
U2 - 10.1109/ICIT63637.2025.10965286
DO - 10.1109/ICIT63637.2025.10965286
M3 - 会议稿件
AN - SCOPUS:105004172961
T3 - Proceedings of the IEEE International Conference on Industrial Technology
BT - 2025 International Conference on Industrial Technology, ICIT 2025 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 26th International Conference on Industrial Technology, ICIT 2025
Y2 - 26 March 2025 through 28 March 2025
ER -