Transcutaneous magnetic resonance power link design. This is a reasonable approximation when the radius of the pole, a, is small compared to the size of the room. The same device can thus powermems 2014 iop publishing. Analysis of dead zone in wireless power transfer via magnetic.
Maximum energy efficiency in wireless power transfer wpt systems can be achieved through the use of magnetic resonance technique at a certain load resistance value. Magnetic resonant coupling based wireless power transfer system with inband power transmitting system. Transfer efficiency optimal control of magnetic resonance. Efficient wireless electric power transmission using. Wireless power transfer via strongly coupled magnetic resonances andre kurs, 1 aristeidis karalis,2 robert moffatt, j. However, it generally exhibits low eciency due to loss in. Wireless power transmission by magnetic resonance circuits. Circuitmodel based analysis of wireless energy transfer system using inductive coupling 1 nausheen bilal, 2aisha jilani, 3 hamna hamid, 4ayesha inayat, 5 sana naeem, 6 nimra 1asstt prof.
The resonant frequency changes from two to one depending on the critical condition. This article traces some early work of tesla and other researchers related to the use of magnetic resonance. Analysis of dead zone in wireless power transfer via. An analysis of the equivalent circuit is used to show how two loosely coupled loops can be made to. Principle of mutual induction is elaborated in fig. A note on computer solution of wireless energy transmit. Wireless power transmission via coupled magnetic resonance is capable of. Here, i o is the peak current, h is the height of the pole, and. This is a usb based programmer for the microcontroller used for burning hex files into avr. During the course of this research, we investigated the need and usefulness of wireless power transmission and the feasibility of using magnetic inductive. The recently published studies in wireless energy transfer deal with optimization and design concerns of the system resonant and magnetic coil parameters 78. In steady state analysis, which applies to the conventional inductive power transmission links, f s t in is a sinusoidal signal described as a s e.
In this paper, a higheciency wireless energy transmission via magnetic resonance is implemented by using the negative permeability metamaterial structures as the magnetic ux guide. If a proper resonant waveguide is brought near the transmitter, the evanescent waves can allow the energy to tunnel to the power drawing waveguide. In particular a thorough analysis of the theory of efficient power transfer is developed for the special case of a resonant inductively coupled link feeding into an efficient switching voltage regulator on. An analysis of the equivalent circuit is used to show how two loosely coupled loops can. Wireless power transfer via magnetic resonant coupling is widely researched for various applications especially for charging electric vehicles. In order to reduce the dependency on battery capacity, charging while the vehicle is moving may be a solution. Intuitively, two resonant objects of the same resonant frequency tend to exchange energy efficiently, while interacting weakly with extraneous offresonant objects. Wireless power transfer via strongly coupled magnetic resonances 1. Efficiency, resonance frequency, wireless power transfer. These coils can be used to provide energy for wireless sensors and batteryoperated devices. We have been doing this in the medical device industry for at least the last two decades. Wireless power transfer systems, coupled resonators, circuit simulations, power transfer efficiency, wireless battery charger. The scmr method has achieved 40% wireless power transfer efficiency in the air for a distance of 2 m for a single receiver 6, and the scmr. Analysis of wireless energy transfer system using magnetic.
Multireceiver and repeater wireless power transfer via. Resonant inductive coupling is also being used in wireless power. The frequency expression of maximum efficiency and the resonant frequency splitting phenomenon condition of a contactless power transmission system were derived. Research results show that system resonance frequency is likely to occur splitting and maybe appear two or three resonance frequenciesodd even mode resonance frequency and nature resonance frequency in close distance under small load, which increases the system instable, and makes the system difficult to control in resonance frequency. Pdf wireless power transfer through inductive coupling is proposed in this paper. It provides flexibility in case of relative orientation between the power source and device during the operation. Brown 5 realized longdistance energy transfer thanks. Using copper coils, power can be transmitted several feet in all directions efficiently. Here the circuit1 is called primary circuit and the circuit2 is called secondary circuit. Circuitmodel based analysis of wireless energy transfer. Energy is provided by a dedicated source, in this case an electric motor, and transferred trough the magnetic coupling onto the rotor inside the harvester. Inductive coupling provides optimum power delivery to a receiver load if both the emitter and the receiver achieve magnetic resonance concurrently.
Yet, there has been a misconception among some researchers who think magnetic resonance for wpt was developed recently. The mit team demonstrated the highly resonant technique using a magnetic field to transfer energy over a midrange distance of 2 meters, and an industry was born. A note on computer solution of wireless energy transmit via magnetic resonance. Rezence is a magnetic resonance power transfer standard developed by the alliance for. Sony develops highly efficient wireless power transfer system. With magnetic resonance, electromagnetic energy is only transferred to recipient devices that share the identical resonant frequencies. Wireless power transmission using magnetic resonance by. This means that there is a wireless energy transfer between the source and the receiver the harvester. Two resonant objects of the same resonant frequency tend to exchange energy efficiently, while interacting weakly with extraneous offresonant objects. O fanti, g feng, y omanakuttan, k ongie, r setjoadi, a sharpe, n. Energy transfer efficiency is the key issue for the fourcoil resonant power link. Energy transfer systems mostly use antennas operating in their near field regions.
A wireless magnetic resonance energy transfer system for micro. The optimization of wireless power transfer via strongly coupled magnetic resonance scmr to sensors embedded in concrete is studied here. This is also called magnetic resonance between two coils operating at a same resonance frequency. In some instances, this technology is also referred to as magnetic resonance, and it is often contrasted to induction for its ability to efficiently transfer. Pdf analysis of wireless power transfer on the inductive coupling. Wireless power transfer via magnetic resonance coupling. Shinohara, n wireless power transfer via radiowaves. Lucas jorgensen and adam culberson in conjunction with professor derin sherman introduction we experimented with wireless power transmission. The background theory for electromagnetic induction between two conducting loops is given and it is shown that an equivalent circuit can be used to model the loops. Hori department of electrical engineering, the university of tokyo, japan department of advance energy, the university of tokyo, japan abstractfuture applications of wireless power.
Automated impedance matching system for robust wireless power. Magnetic resonance has been a cornerstone of nonradiative wireless power transfer wpt since the late 19th century. Magnetic resonance coupling with centimeterscale size of coils has been designed in order to promote the application of magnetic resonance energy coupling in imds. Wireless power transfer via strongly coupled magnetic. The coils are wound with litz wire in order to reduce the ac resistance and improve the q factor. It depends on the selfinductance, quality factor q factor and the carrier frequency. Introduction the major sections of the system that implements ampere and faradays laws are transmission and receiver of the two magnetically coupled coils, named inductive. In this condition, the alternating field amplitude in the primary inductor is constant, a 2 t a 2 e. Design principles one of the most promising applications of the lefthanded metamaterials lhms is the veselagopendry lens made of a single slab of a. The principle of these both types of resonance is to get maximum energy transfer same but the methods are quite different.
In contrast, witricity is based on using coupled resonant objects. Optimization of wireless power transfer via magnetic. The resonance phenomena between l and c can significantly increase each quality factor q in both the transmitter and receiver, despite the lower coupling coefficient, r. Using this system, up to 60 watts of electrical energy can be transferred over a distance of 50cm at an efficiency of approximately 80%, approximately 60% including rectifier.
In, tesla achieved a great progress by designing a resonance. In november 2006, however, researchers at mit reported that they had discovered an efficient way to transfer power between coils separated by a few meters. The energy transfer will occur between these two circuits. Wireless power transfer lane is constructed by embedding the coils beneath the road to provide charging coverage to certain. Wireless power transfer via magnetic resonance coupling from. Sony develops highly efficient wireless power transfer. This phenomenon can be explained using the coupledmode theory. Comparing to other conventional contactless energy transfer mechanisms, midrange wireless electricity transmission using magnetic resonant coupling provides some functional benefits. In my opinion, for the last thirty years, nearly all magnetic induction energy transfer systems place a capacitor to put the secondary coil in resonance. Opportunities and challenges for nearfield wireless power transfer. In order to suppress the fast decrease of the transfer efficiency of magnetic resonance coupled wireless power transfer system mrcwpts with distance increase, this paper investigates the impact factors of the system transfer efficiency and is, then formulates a new efficiency optimal control method based on frequency control. The theoretical foundations for wireless energy transfer were established through the formalization of physical laws by ampere, biotsavart and faraday, which model.
Resonance coupling technique for wireless energy transfer. However, the magnetic resonant coupling and inductive coupling methods are. Wireless power transmission via magnetic resonant coupling. The scmr method is a novel nonradiative wireless midrange power transfer method 10 300 cm that has been recently developed 69. In the em radiation technique, a highly directional antenna is used to transmit and receive microwave energy from point to point, allowing power transmission over long distances kilometer range. Resonant wireless power transfer infineon technologies. L is the resonance width due to load resistance connected to the second object proportional to 1r l, f s t is the excitation applied to the first object, and k 23 is the coupling rate between the two objects. Efficient inductively coupled resonant power transfer for. Figure 1 shows a wireless power transfer system with two magneticallycoupled coils. Drawing upon recent work using farfield standing electromagnetic waves to generate uniform field patterns in a metallic chamber 21, 22, we introduce quasistatic cavity resonance qscr.
From forster resonance energy transfer to coherent resonance ene rgy transfer and back a wheen o mickle s maks a muckle like van niels concept of photochemical oxidore duction, the idea of the photosynthetic unit has become a cornerstone of current descriptions of photosynthesis. Oct 02, 2009 with magnetic resonance, electromagnetic energy is only transferred to recipient devices that share the identical resonant frequencies as the energy source, so energy transfer efficiency is. Agilent eesof 3d em wireless power transfer of application. Wireless energy transfer through magnetic reluctance. In addition, the use of batteries as a substitute for power. Resonant inductive coupling or magnetic phase synchronous coupling is a phenomenon with inductive coupling where the coupling becomes stronger when the secondary loadbearing side of the loosely coupled coil resonates. As this varying magnetic field interacts with the secondary coil it produces an induced current in the secondary coil. May, 2010 until now domestic manufacturers and research institutions have only been focused on the concept that magnetic resonance could be used for wireless power supplies.
The power transferred to a receiver load at resonance is derived and explained. Wireless power transfer via strongly coupled magnetic resonances. This chapter provides a general overview of magnetic resonant wireless power transfer systems based on network models. Since a magnetic field spreads in all directions, making a larger one would waste a lot of energy.
A note on computer solution of wireless energy transmit via magnetic resonance 81. With a proper coil winding and magnetic circuit design, the overall ef. This achieves better power transfer efficiency and everybody knows this. Wireless power transfer via magnetic resonance coupling has generated considerable attention because such transfers have high efficiency and produce a large air gap1.
Until now domestic manufacturers and research institutions have only been focused on the concept that magnetic resonance could be used for wireless power supplies. Design and simulation of wireless power transfer systems. Oneton wireless power transmission system based on. The circuit theory behind coupledmode magnetic resonance. Inductive coupling energy transfer through the mutual inductance between two coils was first used to power imds 5. Lowpower nearfield magnetic wireless energy transfer.
Wireless power transfer system of magnetic resonance. Setjoadi, a sharpe, n, wireless power transfer using weakly coupled. Wireless energy transfer by coupled magnetic resonances is a popular technology in which energy can be transferred via coupled magnetic resonances in the nonradiative nearfield. Figure 1 shows the wireless power transfer system proposed by the mit team. Circuit analysis of wireless power transfer by coupled. Wireless power transmission using magnetic resonance. Is there any difference between induction and resonant. Wireless power transfer wpt using strongly coupled.
In a weak coupling at resonance, magnetic resonant coupling can transfer energy with high efficiency. The focus is to get high efficiency of more than 60% between 10 to 20 cm. Brief history of lowpower magnetic wireless energy transfer development. A resonant transformer of this type is often used in analog circuitry as a bandpass filter. Transfer via magnetic resonance coupling impedance matching and power division utilizing impedance inverter k. This specifically leads to the identification of the local and global optimization. Volume 1 progress in physics january, 2008 fx e ic piat2 2 4. The research work for this thesis is based on utilizing resonant magnetic induction for wirelessly charging electric vehicles. Wireless power transfer is the transmission of electrical energy from a.
Midrange wireless energy transfer using inductive resonance. In the transmitter coil, the electric energy is converted to magnetic energy which is picked up in the receiver coil where it is converted back to electrical energy. Multiband wireless power transfer via resonance magnetic. Wireless power supply via coupled magnetic resonance for on. Joannopoulos,1 peter fisher,3 marin soljacic1 1departm ent of physics, massachusetts institute of techn ol gy, cambrid e, ma 029, usa. Quasistatic cavity resonance for ubiquitous wireless power.
First, we analytically derive the optimal geometric parameters for transmission of power in the air. Sony corporation today announced the development of a highly efficient wireless power transfer system that eliminates the use of power cables from electronic products such as television sets. A wireless magnetic resonance energy transfer system for. This system transfers 45w power wirelessly via magnetic resonance. The probability density functions pdf of the noise and ms with normal. Efficient wireless electric power transmission using magnetic. The transfer is made through inductive coupling and electromagnetic radiation. Maximizing received energy in magnetic resonance wireless. It is shown that for every system, a resonance frequency can be identified where.
Loose coupling or tight coupling between the tx and rx coils. From forster resonance energy transfer to coherent resonance. The purpose of this project is to build the prototype model to prove and demonstrate the concept of wireless energy transfer based on resonance coupling. Wireless energy transfer using resonant magnetic induction. Resonance and wireless power how wireless power works. Wireless power transfer algorithms, technologies and applications. Currently i am working on wireless power transfer using magnetic resonance coupling mrc, inductive and acoustic methods. Magnetic resonant coupling based wireless power transfer. Magnetic resonance and magnetic induction what is the best choice for my application.
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