Power Spilt Based Wireless Charging System With Communication-Free Coordination Control

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiaoqiang Wang
  • Liangxi He
  • Jianping Xu
  • Chi-Kwan Lee
  • Chi K. Tse

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)2754-2767
Journal / PublicationIEEE Transactions on Power Electronics
Volume38
Issue number2
Online published5 Oct 2022
Publication statusPublished - Feb 2023

Abstract

In this article, a power-split-based wireless charging system (WCS) with communication-free coordination control is proposed to combat wide load and coupling variations. By using a magnetic integrated inductor, two power delivery channels are created from a single receiver coil. Large portion of received energy is directly delivered to the load. Small amount of energy is converted by using a low-voltage low-power dc–dc converter to regulate the output voltage or current achieving constant voltage (CV) or constant current (CC) charging operation. This proposal achieves higher power conversion efficiency than the traditional two-stage cascaded converter WCS. Since the dc–dc converter only processes partial power of the WCS system, this proposal reduces the voltage stress of the devices and design difficulty. A communication-free coordination control is applied, which is established by sensing the input current drop caused by the burst operation of the partial-power dc–dc converter. Thus, the CC-CV charging is realized by PWM control at the receiver (Rx) side, and the inverter is regulated with subharmonics control scheme to maintain nearly constant Rx coil current. Simulation results for both high-voltage high-power scenarios and low-voltage low-power (LVLP) scenarios are provided to investigate the operation of the proposed WCS. Finally, experimental results are captured from a 250 W/60–84 V LVLP prototype to validate the feasibility and practicability of proposed concept.

Research Area(s)

  • Communication-free coordination control, magnetic integration, power split, wireless battery charging

Citation Format(s)

Power Spilt Based Wireless Charging System With Communication-Free Coordination Control. / Wang, Xiaoqiang; He, Liangxi; Xu, Jianping et al.

In: IEEE Transactions on Power Electronics, Vol. 38, No. 2, 02.2023, p. 2754-2767.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review