NDLI: Rapid Wireless Capacitor Charging Using a Multi-Tapped Inductively-Coupled Secondary Coil

Content Provider	IEEE Xplore Digital Library
Author	Mercier, P.P. Chandrakasan, A.P.
Copyright Year	2004
Abstract	This paper presents an inductive coupling system designed to wirelessly charge ultra-capacitors used as energy storage elements. Although ultra-capacitors offer the native ability to rapidly charge, it is shown that standard inductive coupling circuits only deliver maximal power for a specific load impedance which depends on coil geometries and separation distances. Since a charging ultra-capacitor can be modeled as an increasing instantaneous impedance, maximum power is thus delivered to the ultra-capacitor at only a single point in the charging interval, resulting in a longer than optimal charging time. Analysis of inductive coupling theory reveals that the optimal load impedance can be modified by adjusting the secondary coil inductance and resonant tuning capacitance. A three-tap secondary coil is proposed to dynamically modify the optimal load impedance throughout the capacitor charging interval. Measurement results show that the proposed architecture can expand its operational range by up to 2.5 × and charge a 2.5 F ultra-capacitor to 5 V upwards of 3.7 × faster than a conventional architecture.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	2263
Ending Page	2272
Page Count	10
File Size	1673338
File Format	PDF
ISSN	15498328
Volume Number	60
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Coils Couplings Capacitors Wireless communication Inductance Equations wireless power transfer Capacitor charging inductive coupling multi-tap inductor ultra-capacitor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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