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2015 | OriginalPaper | Chapter

Near-Field Wireless Power Transfer

Authors : Patrick P. Mercier, Anantha P. Chandrakasan

Published in: Ultra-Low-Power Short-Range Radios

Publisher: Springer International Publishing

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Abstract

Wireless power transfer links are becoming increasingly important for consumer, industrial, and medical electronic devices. There are two principal applications for wireless power transfer that require different optimization criteria: continuous power deliver (e.g., cochlear implant) and periodic charging (e.g., cellular phone). In the former case, optimizing power transfer efficiency is a metric of great importance, while in the latter case, minimizing charging time by maximizing power transfer is important. This chapter presents analytical equations that predict optimal conditions for both applications through first-principals step-by-step reflected load analysis. These equations are then used as the basis for the design of a rapid wireless ultra-capacitor charging circuit that speeds up time-to-charge by 3.7×.

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This is somewhat confusing, since parallel LC resonators exhibit a current multiplicative factor. However, from the perspective of the dependent voltage source Mi ₁ in Fig. 2, a parallel tuning capacitor ends up looking like it is in series with the inductor.

Alternatively, R _s can be lumped into the definition of the primary quality factor: Q _1, mod = ω L ₁∕(R _s + R ₁).

This resistance implicitly includes a conduction angle factor based on the fact that the diodes do not conduct all the time. A different model could include a resistance in series with a voltage source, modeling the average diode drop. Regardless, this analysis is not meant to be quantitative or extremely precise, but is instead used to offer a more qualitative understanding.

A Keithley 2400 sourcemeter was used to measure the power of each tap at output intervals of 0.5 V to dynamically determine the optimal configuration.

P.P. Mercier, A.P. Chandrakasan, Rapid wireless capacitor charging using a multi-tapped inductively-coupled secondary coil. IEEE Trans. Circuits Syst. I 60(9), 2263–2272 (2013)MathSciNetCrossRef

R. Sarpeshkar, Ultra Low Power Bioelectronics: Fundamental, Biomedical Applications, and Bio-inspired Systems (Cambridge University Press, Cambridge, 2010)CrossRef

K. Van Schuylenbergh, R. Puers, Inductive Powering: Basic Theory and Application to Biomedical Systems (Springer, Dordrecht, 2009)CrossRef

A. Kurs, A. Karalis, R. Moffatt, J. Joannopoulos, P. Fisher, M. Soljačić, Wireless power transfer via strongly coupled magnetic resonances. Science 317(5834), 83–86 (2007)MathSciNetCrossRef

M. Kiani, M. Ghovanloo, The circuit theory behind coupled-mode magnetic resonance-based wireless power transmission. IEEE Trans. Circuits Syst. I 59(9), 2065–2074 (2012)MathSciNetCrossRef

K. Van Schuylenbergh, R. Puers, Self-tuning inductive powering for implantable telemetric monitoring systems. Sens. Actuators A Phys. 52(1), 1–7 (1996)CrossRef

W. Sanchez, C. Sodini, J. Dawson, An energy management IC for bio-implants using ultracapacitors for energy storage, in Proc. IEEE Symp. VLSI Circuits (2010), pp. 63–64

Y. Han, O. Leitermann, D. Jackson, J. Rivas, D. Perreault, Resistance compression networks for radio-frequency power conversion. IEEE Trans. Power Electron. 22(1), 41–53 (2007)CrossRef

P. Godoy, D. Perreault, J. Dawson, Outphasing energy recovery amplifier with resistance compression for improved efficiency. IEEE Trans. Microw. Theory Tech. 57(12), 2895–2906 (2009)CrossRef

10.

A. Tanabe, K. Hijioka, H. Nagase, Y. Hayashi, A novel variable inductor using a bridge circuit and its application to a 5–20 GHz Tunable LC-VCO. IEEE J. Solid-State Circuits 46(4), 883–893 (2011)CrossRef

11.

C. Fu, C. Ko, C. Kuo, Y. Juang, A 2.4–5.4-GHz wide tuning-range CMOS reconfigurable low-noise amplifier. IEEE Trans. Microw. Theory Tech. 56(12), 2754–2763 (2008)

12.

M. Paernel, High-efficiency transmission for medical implants. IEEE Solid-State Circuits Mag. 3(1), 47–59 (2011)CrossRef

13.

T.H. Lee, The Design of CMOS Radio-Frequency Integrated Circuits, 2nd edn (Cambridge University Press, Cambridge, 2004)

14.

M. Baker, R. Sarpeshkar, Feedback analysis and design of RF power links for low-power bionic systems. IEEE Trans. Biomed. Ciruits Syst. 1(1), 28–38 (2007)CrossRef

Title: Near-Field Wireless Power Transfer
Authors: Patrick P. Mercier
Anantha P. Chandrakasan
Publisher: Springer International Publishing
Book: Ultra-Low-Power Short-Range Radios
Print ISBN: 978-3-319-14713-0

Electronic ISBN: 978-3-319-14714-7

Copyright Year: 2015
DOI: https://doi.org/10.1007/978-3-319-14714-7_11