Design of a 13.56 MHz dc-to-dc resonant converter using an impedance compression network to mitigate misalignments in a wireless power transfer system

Jungwon Choi, Jiale Xu, Rawad Makhoul, Juan Rivas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This paper presents the design and implementation of a high-frequency resonant converter with an impedance compression network (ICN) to correct horizontal alignment variations between coils in a wireless power transfer (WPT) system. Although magnetic resonant coupling (MRC) coils provide high efficiency for charging mid-range WPT applications, any misalignment between them causes a coil-impedance change and significantly affects performance of the resonant inverters. In order to mitigate variations in coil impedance, we propose an ICN that simultaneously compresses magnitude and phase changes of coil impedance. An ICN consists of a resistance compression network (RCN) to compress magnitude variations, and phase compression network (PCN) to remove phase shifts. The main advantage of an ICN is that it requires only lossless components such as inductors or capacitors. Also, by using Smith chart, which is generally used in RF circuit design to easily calculate load variations, we can effectively reduce phase shifts in power electronics circuits with load variations. We connected the ICN between a class φ2 inverter and MRC coils and then added a class DE rectifier to provide dc-to-dc operation. As a result, we maintained not only zero voltage switching (ZVS) and zero dv/dt operation in a class φ2 inverter, but also constant efficiency of the whole system when the alignment between coils varied.

Original languageEnglish (US)
Title of host publication2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538655412
DOIs
StatePublished - Sep 10 2018
Externally publishedYes
Event19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italy
Duration: Jun 25 2018Jun 28 2018

Publication series

Name2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018

Other

Other19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Country/TerritoryItaly
CityPadova
Period6/25/186/28/18

Bibliographical note

Funding Information:
The authors would like to thank Daihen Corporation for their support in this project through the support provided to the Stanford SystemX Alliance FMA (Faculty, Mentor, Advisor) Research program.

Publisher Copyright:
© 2018 IEEE.

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