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Title: Pulse density modulation for maximum efficiency point tracking of wireless power transfer systems
Authors: Li, Hongchang
Fang, Jingyang
Chen, Shuxin
Wang, Kangping
Tang, Yi
Keywords: Dual-side Soft Switching
Maximum Efficiency Point Tracking
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2017
Source: Li, H., Fang, J., Chen, S., Wang, K., & Tang, Y. (2018). Pulse density modulation for maximum efficiency point tracking of wireless power transfer systems. IEEE Transactions on Power Electronics, 33(6), 5492-5501. doi:10.1109/TPEL.2017.2737883
Series/Report no.: IEEE Transactions on Power Electronics
Abstract: Maximum efficiency point tracking (MEPT) control has been adopted in state-of-the-art wireless power transfer (WPT) systems to meet the power demands with the highest efficiency against coupling and load variations. Conventional MEPT implementations use dc/dc converters on both transmitting and receiving sides to regulate the output voltage and maximize the system efficiency at the expense of increased overall complexity and power losses on the dc/dc converters. Other implementations use phase-shift control or on-off control of the transmitting side inverter and the receiving side active rectifier instead of dc/dc converters but cause new problems, e.g., hard switching, low average efficiency, and large dc voltage ripples. This paper proposes a pulse density modulation (PDM) based implementation for MEPT to eliminate all the mentioned disadvantages of existing implementations. Delta-sigma modulators are used as an example to realize the PDM. A dual-side soft switching technique is proposed for the PDM. The ripple factor of the output voltage with PDM is derived. A 50 W WPT system is built to validate the proposed method. The system efficiency is maintained higher than 70% for various load resistances when the power transfer distance is 0.5 m, which is 1.67 times the diameter of the coils.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2017.2737883
Rights: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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