TY - JOUR
T1 - Overall loss compensation and optimization control in single-stage inductive power transfer converter delivering constant power
AU - Xu, Fei
AU - Wong, Siu Chung
AU - Tse, Chi K.
N1 - Funding Information:
Manuscript received February 23, 2021; revised May 24, 2021; accepted July 15, 2021. Date of publication July 26, 2021; date of current version September 16, 2021. This work was supported by in part by Hong Kong GRF under Grant 152096/17E and in part by RGC Theme-based Research Scheme under Grant T23-701-20-R. Recommended for publication by Associate Editor T. Mishima. (Corresponding author: Fei Xu.) Fei Xu and Siu-Chung Wong are with the Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong (e-mail: [email protected]; [email protected]).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2022/1
Y1 - 2022/1
N2 - A typical battery charging process consists of a constant-current (CC) charging phase which is followed and completed by a constant-voltage charging phase. Moreover, replacing the CC charging by constant-power (CP) charging can eliminate thermal problems and enhance the cycle life of the battery. This work aims to maximize the system efficiency of a single-stage inductive power transfer (IPT) charger by minimizing the overall losses using a CP charging scheme. The single-stage CP IPT charger employs series-series compensation and adopts an active rectifier on the secondary side. Based on a time-domain model, the conditions of zero voltage switching (ZVS) and minimum circulating reactive power are derived. Then, the power losses in the magnetic coupler, inverter and active rectifier are analyzed and optimized under CP output condition. Combining the conditions of ZVS, minimum circulating reactive power, and minimum overall losses, we propose a novel optimal control strategy to maintain CP output and maximum efficiency throughout the charging process. In addition, the proportional integral controller is not needed. Finally, a 120-W experimental prototype is built to verify the performance of the proposed control strategy. Experimental results demonstrate high precision CP output and an efficiency of around 87.5% for the proposed single-stage inductive power transfer battery charger.
AB - A typical battery charging process consists of a constant-current (CC) charging phase which is followed and completed by a constant-voltage charging phase. Moreover, replacing the CC charging by constant-power (CP) charging can eliminate thermal problems and enhance the cycle life of the battery. This work aims to maximize the system efficiency of a single-stage inductive power transfer (IPT) charger by minimizing the overall losses using a CP charging scheme. The single-stage CP IPT charger employs series-series compensation and adopts an active rectifier on the secondary side. Based on a time-domain model, the conditions of zero voltage switching (ZVS) and minimum circulating reactive power are derived. Then, the power losses in the magnetic coupler, inverter and active rectifier are analyzed and optimized under CP output condition. Combining the conditions of ZVS, minimum circulating reactive power, and minimum overall losses, we propose a novel optimal control strategy to maintain CP output and maximum efficiency throughout the charging process. In addition, the proportional integral controller is not needed. Finally, a 120-W experimental prototype is built to verify the performance of the proposed control strategy. Experimental results demonstrate high precision CP output and an efficiency of around 87.5% for the proposed single-stage inductive power transfer battery charger.
KW - Battery charging
KW - conduction losses
KW - constant power (CP)
KW - inductive power transfer (IPT)
KW - maximum efficiency
KW - zero voltage soft switching
UR - http://www.scopus.com/inward/record.url?scp=85111569693&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2021.3098914
DO - 10.1109/TPEL.2021.3098914
M3 - Journal article
AN - SCOPUS:85111569693
SN - 0885-8993
VL - 37
SP - 1146
EP - 1158
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 1
ER -