Autonomous Pulse Frequency Modulation for Wireless Battery Charging With Zero-Voltage Switching

Zhichao Hua, K. T. Chau, Wei Liu, Xiaoyang Tian, Hongliang Pang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


This article proposes an autonomous pulse frequency modulation (APFM) scheme for wireless battery charging in which the self-excited oscillating (SEO) wireless power transfer (WPT) system can offer output power regulation with reliable zero-voltage switching (ZVS). The key is to utilize the self-excited oscillation feature to adjust the WPT operating frequency autonomously so as to deliver more power in the strong coupling region than the traditional forced oscillating (FO) WPT system while the transmission efficiency can maintain at a high level. In the weak coupling region, the system becomes equivalent to the FO-WPT system. The pulse frequency modulation enables the system to adjust the output power by changing its duty ratio. Besides, reliable ZVS is achieved by extracting and processing the current signal at the primary side. Both theoretical analysis and experimental verification are provided to support the feasibility of the proposed APFM for SEO-WPT system.

Original languageEnglish
Pages (from-to)8959-8969
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - 1 Sept 2023
Externally publishedYes


  • Autonomous frequency
  • battery charging
  • pulse frequency modulation (PFM)
  • self-excited oscillation
  • wireless power transfer (WPT)
  • zero-voltage switching (ZVS)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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