NDLI: Two-/three-coil hybrid topology and coil design for WPT system charging electric bicycles

Content Provider	IET Digital Library
Author	Chen, Yang Yang, Naijian Yang, Bin Dai, Ruimin He, Zhengyou Mai, Ruikun Gao, Shibin
Abstract	Wireless power transfer (WPT) for charging electric bicycles (EBs) can save people from tiresome plugging actions and avoid electrical shock hazards, especially in adverse weather. This study proposed a two-/three-coil hybrid topology to achieve constant current (CC) and constant voltage (CV) for charging EBs, simplifying control schemes. The system realises CC output with two-coil topology and operates in CV mode with three-coil topology by turning on a switch. Besides, an inductor array is used to compensate reactive power in CV mode when massive EBs are charged by one high-frequency inverter (HFI). The secondary side of the proposed topology is compact, and the number of components and HFI can be reduced. A coil design process based on double-D-type for the three-coil system is given, with the constraint of mutual inductances among three coils and limited size. To demonstrate the validity of the proposed methods, an experimental setup is built, and the performance of the two-/three-coil hybrid system indicates that the fluctuations of charging current and voltage are <0.64 and 2.12% in the whole charging profile. Moreover, the performance of two WPT chargers connected with one HFI hints that massive EBs can be charged with only one HFI.
Starting Page	2501
Ending Page	2512
Page Count	12
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 10, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6050
Journal	IET Power Electronics
Publisher Date	2019-01-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adverse Weather Battery Chargers Battery Powered Vehicle Bicycles Charging Profile Coil Design Process Coils Constant Voltage Control of Electric Power System Current Voltage CV Mode Electric Bicycles Electric Shocks Electrical Shock Hazards HFI High-frequency Inverter Inductive Power Transmission Inductor Inductor Array Invertors Massive EBs Reactive Power Three-coil Topology Tiresome Plugging Actions Transportation Two-/three-coil Hybrid System Two-coil Topology Wireless Power Transfer System WPT Charger WPT System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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