NDLI: Highly accurate and power-efficient battery charger with charging current compensator for wearable devices

Content Provider	IET Digital Library
Author	Jung, Y. H. Hong, S. K. Kwon, O. K.
Abstract	Highly accurate and power-efficient hybrid battery charger is proposed which includes the switching and linear chargers as well as a charging current compensator. The proposed current compensator operates the switching charger in the constant current (CC) mode to achieve high power efficiency and to improve the charging current accuracy with a small-sized inductor. It also operates the linear charger to minimise the charging current variation in the trickle current (TC) mode and to reduce the battery charging voltage error in the constant voltage (CV) mode. The proposed battery charger was fabricated using a 0.18 μm CMOS process and occupies a chip area of 1.63 mm2. The measurement results show that the proposed battery charger achieves a charging current accuracy of 96.2% in the CC mode, which is improved by 15.8% at a target current of 500 mA, as well as a power dissipation of 0.26 W. In addition, the charging current variation and charging voltage error are measured to be <2 mAP−P in the TC mode and 0.48% in the CV mode.
Starting Page	461
Ending Page	463
Page Count	3
ISSN	00135194
Volume Number	53
e-ISSN	1350911X
Issue Number	Issue 7, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/53/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.0388
Journal	Electronics Letters
Publisher Date	2017-03-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Battery Chargers Battery Charging Voltage Error CC Mode Charging Current Compensator Charging Current Variation Constant Current Mode Constant Voltage Mode CV Mode Energy Conservation Linear Charger Power Electronics Power Supply Power-efficient Battery Charger Secondary Cell Supervisory Circuit Switching Charger TC Mode Trickle Current Mode Wearable Device
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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