A Family of Hybrid IPT Topologies with near Load-Independent Output and High Tolerance to Pad Misalignment

Xiaohui Qu, Yunchang Yao, Dule Wang, Siu Chung Wong, Chi K. Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)


Inductive power transfer (IPT) systems have many unique benefits compared to conventional plugged-in systems. The coupling pads in IPT systems are inevitably misaligned in many practical applications, thus leading to variations of the transferred power and efficiency that necessitate the use of complicated control for output regulation. A common solution is to use two IPT converters with opposite trends of output to pad misalignment, so that the total output voltage or current could be kept near constant for large coupling variations. However, methods for deriving effective configurations for such hybrid IPT converters and their achievable tolerance to the misalignment are still missing. This article constructs a family of hybrid IPT topologies, including input-parallel-output-parallel, input-parallel-output-series, input-series-output-parallel (ISOP), and input-series-output-series for delivering a constant current (CC) or a constant voltage (CV). Design principles and characteristics for all the hybrid systems with near load-independent output and high tolerance to pad misalignment are derived and discussed in detail. Based on this family of configurations, this article also combines some existing IPT topologies and derives multiple hybrid converters for CC or CV output by using a simple duty cycle control. Finally, a 3.5-kW hybrid IPT prototype converter based on the ISOP structure is built to verify the theoretical analysis.

Original languageEnglish
Article number8910467
Pages (from-to)6867-6877
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number7
Publication statusPublished - 1 Jul 2020


  • High tolerance
  • hybrid inductive power transfer (IPT) system
  • load-independent output
  • pad misalignment

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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