Rapid Wireless Capacitor Charging Using a Multi-Tapped Inductively-Coupled Secondary Coil
Name
2012_TCAS.pdf
Description
Final manuscript
Size
8.46 MB
Format
Adobe PDF
Checksum (MD5)
295e25a99ea6c00d66b0600c8bf6b523
Author(s)
Mercier, Patrick Philip
Chandrakasan, Anantha P.
Date Issued
February 2013
Journal
IEEE Transactions on Circuits and Systems I Regular Papers
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Mercier, Patrick P., and Anantha P. Chandrakasan. “Rapid Wireless Capacitor Charging Using a Multi-Tapped Inductively-Coupled Secondary Coil.” IEEE Transactions on Circuits and Systems I: Regular Papers 60, no. 9 (September 2013): 2263–2272.
Version
Author's final manuscript
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/TCSI.2013.2246231
