Load-Independent Voltage and Current Transfer Characteristics of High-Order Resonant Network in IPT System

Jianghua Lu, Guorong Zhu, Deyan Lin, Siu Chung Wong, Jin Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

56 Citations (Scopus)


Load-independent output characteristics of Inductive Power Transfer (IPT) system is of increasing interest in Electric Vehicle (EV) and LED lighting applications. All compensation networks in IPT system are actually high-order resonant circuits. In a high-order resonant network, there are multiple resonant frequencies to get load-independent voltage output and current output. It is critical to analyze the resonant conditions to achieve high efficiency in both load-independent voltage output and current output modes. This paper proposed a general modeling method for arbitrary high-order resonant networks to get both the load-independent voltage and current transfer characteristics. A high-order circuit can be modeled as a combination of a LC network, multi-stage T-circuit, and/or multi-stage Π-circuit in series. The proposed method is verified by applying to voltage-fed double-sided LCC, SS, S-SP, LCC-S and current-fed CLC-LC compensation networks in IPT system. The MATLAB simulation and experimental prototype of a constant voltage-fed double-sided LCC compensated IPT system with up to 3.3-kW power transfer are built. The efficiency of the double-sided LCC compensated IPT system is up to 92.9% and 90.6% when the IPT system operates at resonant frequencies that achieve constant current output and constant voltage output respectively, which are compliance with the frequency requirement by SAE J2954 standard.

Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Publication statusAccepted/In press - 6 Apr 2018


  • Π-circuit
  • Constant current
  • constant voltage
  • Inductive Power Transfer
  • Integrated circuit modeling
  • LC-circuit
  • Load modeling
  • Mathematical model
  • Power electronics
  • Resonant frequency
  • resonant network
  • RLC circuits
  • T-circuit
  • Topology

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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