Journal ArticleDOI
Analysis Model for Magnetic Energy Harvesters
Jinyeong Moon,Steven B. Leeb +1 more
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TLDR
In this article, the authors provide a technique for design optimization for maximizing power harvest, revealing a critical result: for any given core in any particular application, power harvest is maximized when the core is permitted to saturate at an opportune time in the line cycle.Abstract:
Energy harvesting offers an important design option for creating sensing and control elements without a requirement for custom wiring or batteries. An exciting possibility creates a “self-powered” sensor node with an integrated energy harvester that can extract power from the magnetic fields around a power line to a load, in the manner of a current transformer. However, this “current transformer” provides not just current sensing, but also power for a sensor package, all without ohmic contact. This paper provides a technique for design optimization for maximizing power harvest, revealing a critical result: For any given core in any particular application, power harvest is maximized when the core is permitted to saturate at an opportune time in the line cycle. Circuits for optimizing this power transfer window and experimental results supporting the analysis are presented in this paper.read more
Citations
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Patent
Methods and apparatus for increasing a transfer of energy in an inductive power supply
TL;DR: In this paper, a waveform generator was used to generate an alternating waveform by selectively enabling one or more switches coupled to a storage device, and supplying the alternating voltage waveform to a winding coupled to an inductive power supply to modify an alternating magnetic flux in the magnetic core.
Journal ArticleDOI
Magnetic Field Energy Harvesting Under Overhead Power Lines
TL;DR: In this article, a bow-tie-shaped core was designed to produce a much lower demagnetization factor (hence more power) than that of the conventional solenoid, and the selection of core material was studied and found that Mn-Zn ferrite is the most suitable core material because it greatly reduces the eddy current losses and also has high permeability.
Journal ArticleDOI
Soft FerritesߞProperties and Applications
TL;DR: In this paper, the authors discuss the properties and applications of soft and hard ferrites and their applications in search-works, including the application of soft ferrite material from emc to rfid.
Patent
Methods and apparatus for regulating a magnetic flux in an inductive power supply
Giovanni Vannucci,Paul Shala Henry,Thomas M. Willis,Farhad Barzegar,Irwin Gerszberg,Robert Bennett,Harold Lee Rappaport,Donald J. Barnickel +7 more
TL;DR: In this paper, an alternating voltage waveform is generated by selectively enabling one or more switches coupled to a storage device, which can be configured according to a configuration during a portion of a period of the waveform and measured a characteristic of an alternating current flowing in a conductor coupled to the magnetic core.
Journal ArticleDOI
A comparative analysis of energy conservation approaches in hybrid wireless sensor networks data collection protocols
Gaddafi Abdul-Salaam,Abdul Hanan Abdullah,Mohammad Hossein Anisi,Abdullah Gani,Abdulhameed Alelaiwi +4 more
TL;DR: A thematic taxonomy of energy conservation techniques adopted in the various hybrid WSN data collection approaches is presented and discussed, highlighting their pros and cons.
References
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Book
Iterative Methods for Sparse Linear Systems
TL;DR: This chapter discusses methods related to the normal equations of linear algebra, and some of the techniques used in this chapter were derived from previous chapters of this book.
Journal ArticleDOI
Energy scavenging for mobile and wireless electronics
Joseph A. Paradiso,Thad Starner +1 more
TL;DR: A whirlwind survey of energy harvesting can be found in this article, where the authors present a survey of recent advances in energy harvesting, spanning historic and current developments in sensor networks and mobile devices.
Journal ArticleDOI
Effects of eddy currents in transformer windings
TL;DR: In this article, the effect of eddy currents on transformer windings is considered and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings.
Journal ArticleDOI
Adaptive piezoelectric energy harvesting circuit for wireless remote power supply
TL;DR: In this article, an analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an energy harvesting circuit consisting of an AC-DC rectifier with an output capacitor, an electrochemical battery, and a switch-mode DC-DC converter that controls the energy flow into the battery.
Proceedings ArticleDOI
Accurate prediction of ferrite core loss with nonsinusoidal waveforms using only Steinmetz parameters
TL;DR: An improved calculation of ferrite core loss for nonsinusoidal waveforms separates a flux trajectory into major and minor loops via a new recursive algorithm that is highly accurate and outperforms two previous methods for measured data.
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