A Single-Stage Inductive-Power-Transfer Converter for Constant-Power and Maximum-Efficiency Battery Charging

Zhicong Huang, Chi Seng Lam, Pui In Mak, Rui Paulo Da Silva Martins, Siu Chung Wong, Chi K. Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

79 Citations (Scopus)


This article proposes a single-stage inductive-power-transfer (IPT) converter operating as a wireless constant-power (CP) and maximum-efficiency battery charger. By maintaining a constant output power rather than providing a constant output current throughout the dominant stage of battery charging, the IPT converter can make the utmost of its power capability, thus having a faster charging rate. The proposed single-stage IPT converter adopts series-series compensation and includes a switch-controlled capacitor (SCC) and a semiactive rectifier (SAR) in the secondary side. Manipulating the SCC and the SAR to emulate the optimum impedance of the resonator and the load, we propose a novel operation approach combining the merits of load-independent transfer characteristic and load impedance matching, to achieve a simple solution to CP charging and maximum efficiency throughout the charging process. Since the control scheme is based on fixed operating frequency and secondary-side real-time regulation, wireless feedback communication is not required. Moreover, soft switching and low voltage stress can be easily achieved in this IPT converter.

Original languageEnglish
Article number8974434
Pages (from-to)8973-8984
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number9
Publication statusPublished - 1 Sept 2020


  • Battery charging
  • Constant power
  • Inductive power transfer (IPT)
  • Maximum efficiency
  • Soft switching

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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