4.8 Article

Overall Loss Compensation and Optimization Control in Single-Stage Inductive Power Transfer Converter Delivering Constant Power

期刊

IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 37, 期 1, 页码 1146-1158

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3098914

关键词

Battery charging; conduction losses; constant power (CP); inductive power transfer (IPT); maximum efficiency; zero voltage soft switching

资金

  1. Hong Kong GRF [152096/17E]
  2. RGC Theme-based Research Scheme [T23-701-20-R]

向作者/读者索取更多资源

This paper optimizes the system efficiency of a single-stage inductive power transfer charger by minimizing overall losses using a constant-power charging scheme. The conditions of zero voltage switching and minimum circulating reactive power are derived, and the power losses in different components are analyzed and optimized under constant-power output condition. A novel optimal control strategy is proposed to maintain constant-power output and maximum efficiency throughout the charging process.
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 aCPcharging scheme. The single-stageCPIPT 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 underCP output condition. Combining the conditions of ZVS, minimum circulating reactive power, and minimum overall losses, we propose a novel optimal control strategy tomaintainCP 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.

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