DC-DC Converter Based Impedance Matching for Maximum Power Transfer of CPT System with High Efficiency

Dai Bui, Tarek M. Mostafa, Aiguo Patrick Hu, Reiji Hattori

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

5 Citations (Scopus)

Abstract

It is well known that a DC or fully tuned inductive power transfer (IPT) system operating at its maximum power output point results in a low power efficiency being equal or below 50%. Based on the analyses of the maximum power transfer condition against the detuning factor of an LC resonant circuit, this paper proposes a Capacitive Power Transfer (CPT) system which can track the maximum power output using a DC-DC converter, at the same time achieve a high-power efficiency when the circuit is not fully tuned. The method is applied to a voltage-fed inverter at series tuned off-resonance operation for reduced power losses. A prototype system is built with a half-bridge inverter to drive the capacitively coupling circuit, and a buck-boost converter is designed for impedance matching. A perturb and observe algorithm is developed for controlling the duty cycle of the DC-DC converter to track the maximum power against load variations. It is found that under a fixed electric field coupling condition, the system can maintain the maximum power transfer operation at 10W and achieve a power efficiency of about 70% over a wide range of load variation from 5\mathbf{\Omega} to 500\mathbf{\Omega}.

Original languageEnglish
Title of host publication2018 IEEE PELS Workshop on Emerging Technologies
Subtitle of host publicationWireless Power Transfer, Wow 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538624654
DOIs
Publication statusPublished - Aug 29 2018
Event2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer, Wow 2018 - Montreal, Canada
Duration: Jul 3 2018Jul 7 2018

Publication series

Name2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer, Wow 2018

Other

Other2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer, Wow 2018
CountryCanada
CityMontreal
Period7/3/187/7/18

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Control and Optimization
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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