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
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.
Journal ArticleDOI
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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Journal ArticleDOI
Flexibility of Contactless Power Transfer using Magnetic Resonance Coupling to Air Gap and Misalignment for EV
TL;DR: In this paper, the authors proposed a contactless power transfer (CPT) for electric vehicles by magnetic resonance couplings and small antennas, which more easily span air gaps and are more forgiving to antennas misalignments than traditional solutions.
Journal ArticleDOI
Design and Development of Low-Loss Transformer for Powering Small Implantable Medical Devices
TL;DR: An unconventional design method is proposed for a high-efficiency energy transmission transformer (ETT) that can transmit energy transcutaneously to small implantable medical devices using electromagnetic induction.
Proceedings ArticleDOI
A Simple and versatile design method of resonator-coupled wireless power transfer system
Ikuo Awai,Takuya Komori +1 more
TL;DR: In this paper, a simple design method for the resonator-coupled wireless power transfer system is proposed on the basis of the BPF theory, which can be applied for any resonators as long as their resonant frequency is chosen the same, it has a wide range of practical application.
Journal ArticleDOI
A wireless batteryless deep-seated implantable ultrasonic pulser-receiver powered by magnetic coupling
TL;DR: The study establishes the feasibility of a deep-seated implantable ultrasonic pulser-receiver powered by coplanar magnetic coupling and shows that the magnetic energy absorption in body tissue is negligible, and the magnetic coupling has low sensitivity to receiving coil placement.
Proceedings ArticleDOI
An adaptive impedance matching approach based on fuzzy control
TL;DR: An adaptive impedance matching scheme for 2.4GHz wireless communication, based on fuzzy control, is proposed, using a two-port passive matching network controlled by a zero-order Takagi-Sugeno-Kang fuzzy controller to iterate until the matching point is reached.