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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A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer
TL;DR: With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency.
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Skin-integrated wireless haptic interfaces for virtual and augmented reality.
Xinge Yu,Zhaoqian Xie,Yang Yu,Yang Yu,Jungyup Lee,Abraham Vázquez-Guardado,Haiwen Luan,Jasper Ruban,Xin Ning,Aadeel Akhtar,Dengfeng Li,Bowen Ji,Bowen Ji,Yiming Liu,Rujie Sun,Jingyue Cao,Qingze Huo,Yishan Zhong,Chan Mi Lee,Seung Yeop Kim,Philipp Gutruf,Changxing Zhang,Yeguang Xue,Qinglei Guo,Aditya Chempakasseril,Peilin Tian,Wei Lu,Ji Yoon Jeong,Yong Joon Yu,Jesse Cornman,Chee Sim Tan,Bong Hoon Kim,Bong Hoon Kim,Kun Hyuk Lee,Xue Feng,Yonggang Huang,John A. Rogers,John A. Rogers +37 more
TL;DR: A wireless, battery-free platform of electronic systems and haptic interfaces capable of softly laminating onto the curved surfaces of the skin to communicate information via spatio-temporally programmable patterns of localized mechanical vibrations is presented.
Journal ArticleDOI
A Maximum Efficiency Point Tracking Control Scheme for Wireless Power Transfer Systems Using Magnetic Resonant Coupling
TL;DR: In this paper, a maximum efficiency point tracking control scheme is proposed to maximize the system efficiency while regulating the output voltage, which is unique and prominent in that it fixes the operating frequency at the receiving-side resonant frequency and converts both the input voltage and the load resistance at the same time.
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Analysis and Tracking of Optimal Load in Wireless Power Transfer Systems
TL;DR: In this paper, a perturbation-and-observation-based tracking system is developed through additional hardware such as a cascaded boost-buck dc-dc converter, an efficiency sensing system, and a controller.
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An Active-Rectifier-Based Maximum Efficiency Tracking Method Using an Additional Measurement Coil for Wireless Power Transfer
TL;DR: In this paper, an active single-phase rectifier (ASPR) with an auxiliary measurement coil (AMC) and its corresponding control method are proposed to track the maximum system efficiency under varied loads and detuning conditions in real time.
References
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Proceedings ArticleDOI
Convergence improvement of efficiency-optimization control of induction motor drives
M.T. Cao,Yoichi Hori +1 more
TL;DR: In this article, the authors proposed a novel algorithm for efficiency optimization control of induction motor (IM) drives using the "golden section technique" in the process searching the optimal value of rotor flux current reference, for which the electrical input power of the system is minimal.
Journal ArticleDOI
Adaptive Impedance-Matching Techniques for Controlling L Networks
TL;DR: Techniques for adaptive control of impedance-matching L networks are presented, which provide automatic compensation of antenna mismatch and renders calibration and elaborate software computation superfluous and allows for autonomous operation of adaptive antenna- matching modules.
Journal ArticleDOI
Power Waves and Conjugate Matching
TL;DR: New physical reasoning of power waves is given starting from the principle of conjugate matching and a new formula for the reference impedances for a two-port system is given such that the system is simultaneously conjugates matched for both ports.
Proceedings ArticleDOI
Study on open and short end helical antennas with capacitor in series of wireless power transfer using magnetic resonant couplings
TL;DR: In this paper, a magnetic resonant coupling using helical antennas is proposed, where the capacitor is installed to antennas in series and parallel is studied, and the short end helical antenna with a capacitor in series makes series resonance.
Journal ArticleDOI
Wireless Power Transfer System via Magnetic Resonant Coupling at Fixed Resonance Frequency-Power Transfer System Based on Impedance Matching-
TL;DR: In this paper, the possibility of using impedance matching (IM) networks to adjust the resonance frequency of a pair of antennas at a certain distance to 13.56MHz is studied.