Journal ArticleDOI
Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling
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TLDR
An automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source, improving the power transfer efficiency.Abstract:
Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.read more
Citations
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Journal ArticleDOI
Enhancing the Robustness of the Wireless Power Transfer System to Uncertain Parameter Variations Using an Interval-Based Uncertain Optimization Method
TL;DR: In this article, a modified WPT system structure and an interval-based uncertain optimization method are proposed to enhance the robustness of the WET system to uncertain parameter variations, which includes two Q-type impedance matching networks, can switch between two different operating modes.
Journal ArticleDOI
A Magnetic Resonance Wireless Power Transfer System Robust to Distance Variation Using Dual-Matching Scheme
TL;DR: In this paper, the authors proposed a switchless passive dual-matching technique to achieve high power transfer efficiency over a wide range by generating critical coupling at two other positions by using a switched-passive dual matching technique.
Journal ArticleDOI
Effect of Additional Transmitting Coils on Transfer Distance in Multiple-Transmitter Wireless Power Transfer System
TL;DR: In this paper , the authors analyzed the transfer distance and lateral coverage based on the generalized critical coupling condition and system energy efficiency according to the number of additional Tx coils in the multiple-input single-output (MISO) WPT system.
Proceedings ArticleDOI
Repeater tuning against load variation for wireless power transfer
TL;DR: In this article, the incorporation of a repeater with a wireless power transfer (WPT) system for the performance improvement is investigated, where the self-resonance frequencies of transmitter, receiver and repeater coils are investigated as a promising approach to improve the performance against load variation.
Journal ArticleDOI
Equivalent Circuit Modeling and Analysis of Metamaterial Based Wireless Power Transfer
Webster Adepoju,Indranil Bhattacharya,Ismail Fidan,Olatunji Moshood Abiodun,Ranger Buchanan,Trapa Banik,Muhammad Enagi Bima +6 more
TL;DR: In this paper , an equivalent circuit model is presented to emulate the behavior of a metamaterial-based wireless power transfer system, and a numerical analysis of the proposed structure is explored to evaluate its transfer characteristics.
References
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Journal ArticleDOI
Wireless Power Transfer via Strongly Coupled Magnetic Resonances
Andre B. Kurs,Aristeidis Karalis,Robert Moffatt,John D. Joannopoulos,Peter H. Fisher,Marin Soljacic +5 more
TL;DR: A quantitative model is presented describing the power transfer of self-resonant coils in a strongly coupled regime, which matches the experimental results to within 5%.
Journal ArticleDOI
Analysis, Experimental Results, and Range Adaptation of Magnetically Coupled Resonators for Wireless Power Transfer
TL;DR: A circuit model is presented along with a derivation of key system concepts, such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes undercoupled, including the introduction of key figures of merit.
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.
Journal ArticleDOI
Design considerations for a contactless electric vehicle battery charger
TL;DR: This paper overviews theoretical and practical design issues related to inductive power transfer systems and verifies the developed theory using a practical electric vehicle battery charger.
Journal ArticleDOI
Power Waves and the Scattering Matrix
TL;DR: In this paper, the physical meaning and prop-erties of the power waves defined by [Equation], [ Equation] where V/sub i/ and Z/sub I/ are the voltage at and the current flowing into the ith port of a junction and the impedance of the circuit connected to the it h port.