Design of High-frequency Resonant Inverter for Capacitive Wireless Power Transfer

Minki Kim, Jungwon Choi

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

Abstract

This paper presents a novel approach to design a resonant inverter for capacitive wireless power transfer (CPT). CPT, transmitting energy via electric coupling between conducting plates, draws lots of attention because of lighter weight and more compact size than inductive wireless power transfer (IPT) using magnetic fields. This paper proposes a class F2 inverter topology in a small air-gap CPT system to mitigate misalignments in the coupling capacitors. The output capacitor of the load network in the class F2 inverter operates as not only a dc block but also a coupling capacitor in the CPT system. The flexible design process of a class F2 inverter to select the capacitor allows us to maintain high efficiency with any misalignment between coupling capacitors. We also explore different dielectric materials to achieve high capacitance values for coupling capacitors. We present experimental measurements of the capacitors and the push-pull inverter with the measured values of the coupling capacitors. The system's nominal output power was 330 W with a 90% efficiency at an input voltage of 50 V. With the misalignments up to 5cm, the efficiency is almost constant, 90%, while the capacitance of the coupling plates varies from 6.32 nF to 5.24 nF.

Original languageEnglish (US)
Title of host publication2020 IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728171609
DOIs
StatePublished - Nov 9 2020
Event21st IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2020 - Aalborg, Denmark
Duration: Nov 9 2020Nov 12 2020

Publication series

Name2020 IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020

Conference

Conference21st IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2020
CountryDenmark
CityAalborg
Period11/9/2011/12/20

Bibliographical note

Publisher Copyright:
© 2020 IEEE.

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