Overall loss compensation and optimization control in single-stage inductive power transfer converter delivering constant power

Fei Xu, Siu Chung Wong, Chi K. Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1146-1158
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume37
Issue number1
DOIs
Publication statusPublished - Jan 2022

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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