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Erschienen in:
Introduction to Ultra Low Power Transceiver Design Kapitel lesen Erstes Kapitel lesen

2015 | OriginalPaper | Buchkapitel

Near-Field Wireless Power Transfer

verfasst von : Patrick P. Mercier, Anantha P. Chandrakasan

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

Verlag: 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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Vorheriges Kapitel Centimeter-Range Inductive Radios
Nächstes Kapitel Energy Harvesting Opportunities for Low-Power Radios
Fußnoten
1
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.
 
2
Alternatively, R s can be lumped into the definition of the primary quality factor: Q 1, mod  = ω L 1∕(R s + R 1).
 
3
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.
 
4
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.
 
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Metadaten
Titel
Near-Field Wireless Power Transfer
verfasst von
Patrick P. Mercier
Anantha P. Chandrakasan
Copyright-Jahr
2015
Buch
Ultra-Low-Power Short-Range Radios

Print ISBN: 978-3-319-14713-0

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

Copyright-Jahr: 2015

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

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