A Flexible Load-Independent Multi-Output Wireless Power Transfer System Based on Cascaded Double T-Resonant Circuits : Analysis, Design and Experimental Verification: Analysis, Design and Experimental Verification

Yong Li, Jiefeng Hu, Xiaofei Li, Ka Wai Eric Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


There are practical applications requiring the wireless power transfer (WPT) system to supply multiple output voltages to a variety of loads. In this paper, in order to achieve this goal, multiple double T resonant circuits are connected to the common port of the receiver side. Based on the modeling and analysis of the double T resonant circuit, it is found that the load-independent output and input zero phase angle (ZPA) can be derived. The proposed WPT system presents the following merits: 1) output voltages are load independent and can be controlled synchronously against the disturbance from input DC source and mutual coupling by using only one closed loop; 2) the output voltages can be adjusted individually to different levels by configuring circuit parameters; 3) only passive components are used to achieve multiple outputs. The power loss can be reduced due to the parasitic resistance of the passive component is very small and can be negligible; and 4) the reactive power losses are minimized due to the input ZPA of the system. An experimental prototype with two output channels is built, based on which the load independent and the controllable characteristics of the output voltages are verified.

Original languageEnglish
Article number8671502
Pages (from-to)2803-2812
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number7
Publication statusPublished - 1 Jul 2019


  • double T resonant circuit
  • load independent
  • multiple output voltages
  • Wireless power transfer (WPT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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