NDLI: Step-charging technique for CC/CV mode battery charging with low-cost control components in IPT systems

Content Provider	IET Digital Library
Author	Na, Kyungmin Ma, Hyunggun Namgoong, Gyeongho Kim, Katherine A. Jung, Jee Hoon Bien, Franklin
Abstract	In wireless power transfer technology, power control technique is required to realise constant current (CC) and constant voltage (CV) modes for battery charging. CC and CV modes are needed to effectively charge lithium (Li)-ion batteries to ensure long life span and maximum capacity utilisation. The use of additional battery charging circuitry reduces efficiency, increases volume, and increases circuit complexity. The frequency modulation method is a method that can control power without an additional charging circuit, but a high-resolution controller is needed to control the voltage and current for charging the battery by frequency modulation. This study proposes a system that controls current and voltage for CC and CV modes through a step-charging method using a battery hysteresis with a low-cost control system. The in-band communication circuit is analysed and used to link the primary and secondary sides of the inductive power transfer (IPT) coils, which enables effective feedback control without an additional wireless communication module. This method enables high-efficiency charging while minimising the overall size and cost of mobile IPT applications such as power tools. The proposed system shows 90.3% transfer efficiency with a 20.75 V, 4 Ah Li-ion battery at 7 mm distance.
Starting Page	2523
Ending Page	2530
Page Count	8
ISSN	17554535
Volume Number	11
e-ISSN	17554543
Issue Number	Issue 15, Dec (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/11/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5450
Journal	IET Power Electronics
Publisher Date	2018-10-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Additional Charging Circuit Battery Charging Circuitry Battery Hysteresis CC/CV Mode Battery Circuit Complexity Control of Electric Power System Current Voltage Effective Feedback Control Feedback Frequency Modulation Method High-efficiency Charging High-resolution Controller In-band Communication Circuit Inductive Power Transfer Coils Inductive Power Transmission IPT System Li-ion Battery Lithium-ion Battery Long Life Span Low-cost Control Component Low-cost Control System Maximum Capacity Utilisation Mobile IPT Application Power And Energy Control Power Control Power Control Technique Power Tool Power Transmission Control Secondary Cell Step-charging Method Step-charging Technique Transfer Efficiency Voltage 20.75 V Wireless Communication Module Wireless Power Transfer Technology
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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