Open AccessProceedings Article
Limitation of inductive power transfer for consumer applications
Eberhard Waffenschmidt,Toine Staring +1 more
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TLDR
In this article, the authors derived the matching conditions for optimal power efficiency for inductive power transmission structures with varying distance and size ratios and investigated the achievable power efficiency of a given structure with respect to resonant matching and load impedance.Abstract:
Inductive power transmission is proposed more and more also for consumer applications. In this work, limitations with respect to efficiency of the whole magnetic system are investigated. The power efficiency of a given structure is dependent on resonant matching and on the load impedance. First, the matching conditions for optimal power efficiency are derived. Then the achievable efficiency for inductive transmission structures with varying distance and size ratios are investigated. Recent publications on inductive power transmission are evaluated and discussed based on these results. As a conclusion, inductive power transmission in a larger space (e.g. a whole room) is very inefficient. On the other hand, inductive power transmission at a surface can be efficient as conventional power supplies. Based on this insight, an inductive power transmission pad has been designed and built, with the purpose to charge mobile devices like mobile phones. It can charge an arbitrary number of devices and allows free positioning of the devices on the pad. It consists of an array of planar transmitter coils and has a size of 20 cm x 26 cm. It can detect the position of a receiver and activates only the coils underneath a receiver.read more
Citations
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Dissertation
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References
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Journal ArticleDOI
Efficient wireless non-radiative mid-range energy transfer
TL;DR: In this article, the physical phenomenon of long-lifetime resonant electromagnetic states with localized slowly-evanescent field patterns was investigated to transfer energy efficiently over non-negligible distances even in the presence of extraneous environmental objects.
Patent
Wireless non-radiative energy transfer
TL;DR: In this paper, the authors proposed an electromagnetic energy transfer device that includes a first resonator structure receiving energy from an external power supply, and a second resonance structure is positioned distal from the first, and supplies useful working power to an external load.
Journal ArticleDOI
A new generation of universal contactless battery charging platform for portable consumer electronic equipment
Shu Yuen Ron Hui,W.W.C. Ho +1 more
TL;DR: In this paper, a planar inductive battery charger for portable electronic equipment such as mobile phones, palm pilots and CD players is proposed, which can generate magnetic flux of almost even magnitude over the surface of the winding arrays.
Proceedings ArticleDOI
Optimal operation of contactless transformers with resonance in secondary circuits
TL;DR: In this paper, a mathematical analysis based on simplified circuit model is presented to determine the optimal operating range for SS and SP mode, respectively, from the efficiency point of view, and calculated and measured results have been given to verify the theory.