Four-switch Class-PN Power Amplifier for High Power Handling Capability in Wireless Power Transfer

Faheem Ahmad*, Asger Bjørn Jørgensen, Stig Munk-Nielsen

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

4 Citations (Scopus)
119 Downloads (Pure)


Most power amplifiers (PA) for wireless power transfer (WPT) are based on single switch topologies (Class- mathbf{E}, mathbf{F}, Phi,). Single-switch topologies are easy to design and operate, but they are limited in power handling capability. Utilizing multi-switch topologies increases device utilization which improves power handling capability. In this paper a novel topology is introduced, which is referred as Class-PN. Class-PN is based on four switches, and is shown to have more than 6x higher power handling capability than Class-E. The topology consists of no resonating passive components, thus the same PA is operational at multiple switching frequencies. Series resonating load at output power of 135W and switching frequency of both 7MHz and 12MHz are shown at first to verify operation of Class-PN power amplifier. Finally, inductively coupled coils are used to transfer power wirelessly between the transmission and receiving coil. Wireless power delivered to the load at 6.15MHz of switching frequency is 400W, which was limited by the radio frequency (RF) load.

Original languageEnglish
Title of host publication2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)
Number of pages5
Place of PublicationHimeji, Japan
Publication date1 Jul 2022
ISBN (Print)978-1-6654-1631-3
ISBN (Electronic)978-4-8868-6425-3
Publication statusPublished - 1 Jul 2022
EventIPEC 2022 ECCE Asia - Himeji city culture and convention center, Himeji, Japan
Duration: 15 May 202219 May 2022


ConferenceIPEC 2022 ECCE Asia
LocationHimeji city culture and convention center
Internet address


  • Inductive Power Transfer
  • Inductive Power Link
  • RF power amplifiers
  • RF Converter
  • Wireless power transfer
  • ZVS converters


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