EMI Reduction in Wireless Power Transfer System using Spread Spectrum Frequency Dithering

Abstract

This paper presents the use of spread spectrum technique to reduce electromagnetic interference caused by fast switching transitions of a resonant inverter and rectifier used for wireless power transfer (WPT) systems. We investigate the magnetic field emission from a series-resonant WPT system having the resonance frequency of 20 kHz in a frequency band from 9 kHz to 150 kHz. The averaging spectral estimate (Welch's Periodogram) of the simulated leakage magnetic field shows that a harmonic peak can be reduced up to 8.7 dB by dithering the switching frequency with a triangular modulation profile.

Meeting Name

2016 IEEE Wireless Power Transfer Conference, WPTC 2016 (2016: May 5-6, Aveiro, Portugal)

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

Electric power systems; Electric rectifiers; Electromagnetic pulse; Frequency bands; Interference suppression; Magnetic fields; Magnetic leakage; Spectroscopy, Leakage magnetic field; Resonance frequencies; Resonant inverters; Spectral estimate; Spread spectrum techniques; Triangular modulations; Wireless power transfer; Wireless power transfer (WPT), Inductive power transmission

International Standard Book Number (ISBN)

978-146737986-1

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2016

Link to Full Text

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