An Integrated Inductive Power Transfer System Design with a Variable Inductor for Misalignment Tolerance and Battery Charging Applications

Zhuhaobo Zhang, Fan Zhu, Dehong Xu, Philip T. Krein, Hao Ma

Research output: Contribution to journalArticlepeer-review

Abstract

Inductive power transfer (IPT) technology is useful for electric vehicle (EV) charging because of safe, flexible, and convenient features. In this paper, an integrated IPT system design employing variable inductor control is proposed to achieve a target constant current (CC) and constant voltage (CV) battery charging profile with misalignment tolerance. The system is implemented under a fixed switching frequency in both CC and CV modes. Soft switching of the primary inverter can be achieved over the entire charging process and allowed misalignment range without additional switches or dc-dc converters. Theoretical circuit analysis and the system design process are presented. A 3.3-kW prototype is implemented with a 210-mm air gap to demonstrate the validity of the proposed method. Experimental results show that the target CC and CV charging profile can be achieved by adjusting the variable inductor with up to 120 mm of lateral and 300 mm of vertical misalignment. The maximum efficiency of the proposed system is 96.1% at full output power and stays above 95% throughout CC operation.

Original languageEnglish (US)
Article number9069415
Pages (from-to)11544-11556
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume35
Issue number11
DOIs
StatePublished - Nov 2020
Externally publishedYes

Keywords

  • Constant current/constant voltage charging
  • inductive power transfer
  • misalignment tolerance
  • variable inductor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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