Circuit Analysis of Achievable Transmission Efficiency in an Overcoupled Region for Wireless Power Transfer Systems

Won Kyu Choi, Chan Won Park, Kisong Lee

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

On nonradiative wireless power transfer (WPT) using a pair of magnetically coupled resonators, we investigate the achievable transmission efficiency for a different set of resonators. Using a simplified equivalent circuit model, we analyze the phenomenon of frequency splitting mathematically in the overcoupled region ( k > k-{\rm {ref}}). Even though the transmission efficiency tends to gradually decrease as the distance between the two resonators gets closer and closer in the overcoupled region, the transmission efficiency can be improved by tracking one of two separated frequency modes. Based on this observation, we prove mathematically that the achievable transmission efficiency at k-{\rm {ref}} is maintained almost constantly even when k > k-{\rm {ref}} if the identical resonators are used. In order to validate the accuracy of the analysis, we design and fabricate two types of magnetically coupled resonators: one is the set of identical resonators and the other is the set of nonidentical resonators. Through experiments in various environments, we show that the analytical results are in good agreement with the measured ones. Our work can provide an insight into design resonators for short-range WPT systems, in order to ensure better and stable performance.

Original languageEnglish
Article number8098613
Pages (from-to)3873-3876
Number of pages4
JournalIEEE Systems Journal
Volume12
Issue number4
DOIs
StatePublished - Dec 2018

Keywords

  • Achievable transmission efficiency
  • equivalent circuit model
  • frequency splitting
  • wireless power transfer (WPT)

Fingerprint

Dive into the research topics of 'Circuit Analysis of Achievable Transmission Efficiency in an Overcoupled Region for Wireless Power Transfer Systems'. Together they form a unique fingerprint.

Cite this