Wireless power transfer wpt, wireless power transmission, wireless energy transmission wet, or electromagnetic power transfer is the transmission of electrical energy without wires as a physical link. Wireless power transmission using magnetic resonance by. The magnetic resonance wpt technology enables power transmission between transmitter and receiver coils with the same resonance frequency. Wireless power transmission into a space enclosed by metal. Characteristics of the magnetic resonance wpt system. Achieves wireless power transfer to mobile objects with. Study on electromagnetic characteristics of the magnetic. Taking maximum power transmission and power stable transmission as research objectives, optimal design for the wireless power transmission system based on magnetic resonance coupling is carried out in this paper. They used a selfmade wireless power device to power a 60watt bulb from a distance of 2 m, with an efficiency of 4050%. Wireless power transfer using magnetic coupled resonance is proposed by mit in 2007 1. First, we analytically derive the optimal geometric parameters for transmission of power in the air. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ism band. Some examples of magnetic resonance based wpt projects conducted by researchers in the biomedical and power electronics communities over last few decades are included.
Based on the mutual coupling model of resonance system, the influence laws of system transmission parameters, such as coil coupling coefficients, load resistance, etc. Although by direct connection of metal wires traditional wired power transmission has good characteristics like high transmission efficiency, transmission stability, etc. Transmission of wireless power by magnetic resonance submitted by christopher a. 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. Man solves teslas secret to amplifying power by nearly 5000%. The principles of magnetic resonance are applied in the laboratory to analyze the atomic and nuclear properties of matter electronspin resonance esr was first observed in 1944 by a soviet physicist, y. Witricity corporation provides technology to enable wireless power transfer over distance using magnetic resonance. The initial idea of wireless power transmission by magnetic resonance method was introduced by. Resonant wireless power transfer infineon technologies. An electric current running in a sending coil induces another current in a receiving coil. Pdf the transmission of wireless power by magnetic.
The power transmission model analysis using rlt provides the same formulation as cmt while predicting the average power transmission in resonant coupled system and is more convenient. Investigation of magnetic resonance coupling circuit. It was previously introduced an entropy approach that identifies the nature of electric current and magnetic flux as a flow of electromagnetic waves that have electric or magnetic potentials. Optimization of wireless power transfer via magnetic. A higher coupling factor improves the transfer efficiency, and reduces losses and heating. Magnetic coupling is an old and well understood method in the field of wireless power transfer. Using copper coils, power can be transmitted several feet in all directions efficiently. B 20 087301 view the article online for updates and enhancements. Pdf an entropy approach to wireless power transmission by. Wireless power supplies using magnetic resonance may 2010, by john messina magnetic induction is the concept used in wireless power supplies. Wireless power transmission via magnetic resonant coupling. Wireless power transfer is a generic term for a number of different technologies for transmitting energy by means of electromagnetic fields.
Firstly, based on the mutual coupling model, mathematical expressions of optimal coupling coefficients for the maximum power transmission target are deduced. In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a timevarying electromagnetic field, which transmits power across space. Us20140070625a1 method for communication and power. But as the magnetic field decay very quickly, magnetic field is effective only at a very short distance. The advantages, disadvantages, biological impacts and applications of wpt are also presented.
Wireless power transmission market by type, technology. Higher levels of transferred power is possible if larger magnetic. Data transmission system using magnetic resonance wireless. Magnetic waves from one place to another is in order to reduce the transmission and distribution losses. This work involves investigation of a type of wireless power system wherein its analysis will yield the construction of a prototype modeled as a singular technological artifact. While section iv describes the magnetic resonance method followed a comparison of these three methods. The transmitter will be limited by the maximum current in the system. Wireless power transmission using magnetic resonance. In, tesla achieved a great progress by designing a resonance. Design on magnetic coupling resonance wireless energy transmission and monitoring system for implanted devices, ieee trans. Keywordswireless power transmission, magnetic resonance, evanescentwave coupling, relaxation oscillator. Witricity type magnetic resonance coupling systems add another set of resonant coils on the primary power source side which pair with the coils on the secondary load bearing side.
Parallel transmission to reduce absorbed power around deep brain stimulation devices. Inductive technology has almost commoditized in the wireless power transmission market, especially for the consumer electronics applications. Magnetic resonance coupling is a phenomenon where transfer of power is highly efficient between the transmitter and receiver. This article traces some early work of tesla and other researchers related to the use of magnetic resonance in wpt. The transmission range of wireless power transmission through electromagnetic induction and or by magnetic resonance technique is limited. A mrwpt is a method of transferring electrical energy through space by driving the system at resonant frequency of the resonator. The more flux reaches the receiver, the better the coils are coupled. 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. This limitation of the range poses a serious challenge for the manufacturers. Recently, studies on the commercialization of magnetic resonance wireless power transfer wpt systems are underway domestically and internationally.
By applying resonance with in magnetic coupling, the power transfer at a greater distance can be obtained. Pdf investigation of magnetic resonance coupling circuit. Wireless energy transfer, resonant inductive coupling, induction, reso. Resonant inductive coupling is also being used in wireless power systems for portable computers, phones, and vehicles. Although transmitter and receiver is electrically isolated, they should be physically touched. This paper describes data transmission system using magnetic resonance wireless power transfer mrwpt.
The optimization of wireless power transfer via strongly coupled magnetic resonance scmr to sensors embedded in concrete is studied here. Wireless power transmission using magnetic resonance ijert. Magnetic resonance, absorption or emission of electromagnetic radiation by electrons or atomic nuclei in response to the application of certain magnetic fields. Wireless electricity transmission based on electromagnetic and resonance magnetic coupling 1 ramesh kumar banjare, 2manoj kumar 1mmct,raipur. In this condition, the alternating field amplitude in the primary inductor is constant, a 2 t a 2 e. The cmt method has been recently applied to a pair of capacitively loaded conductingwire loops, spaced by d 23, as shown in fig. William holderbaum school of systems engineering april 20. In some instances, this technology is also referred to as. The magnetic resonance method of wireless power transfer is a method which has emerged to overcome the problem of drop in efficiency due to the distance between the power transmission coil and power reception coil. Unlike the far field wireless power transmission systems based on traveling electromagnetic waves, wireless electricity. 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.
Equivalent circuit and calculation of its parameters of. Lucas jorgensen and adam culberson in conjunction with professor derin sherman introduction we experimented with wireless power transmission. In another general aspect, there is provided a method for communication and power control of a wireless power receiver in a magnetic resonant wireless power transmission system, the method including receiving notice information from a wireless power transmitter, and transmitting a search signal to the wireless power transmitter based on the. Pdf an entropy approach to wireless power transmission. Theoretical study on the influence of transmission. A resonant transformer of this type is often used in analog circuitry as a bandpass filter. Currently, wireless power transmission is based on the two technologies. Until now domestic manufacturers and research institutions have only been focused on the concept that magnetic resonance could be used for wireless power supplies.
Literature survey previous methods for wireless transmission include attempt by the late scientist nikola tesla and the microwave power transmission. Related content a high sensitivity index sensor based on magnetic plasmon resonance in metallic grating with very narrow slits. Wireless power transmission using magnetic resonance pradeep singh department of electronics and telecommunication engineering k. Wireless power transmission by magnetic resonance circuits.
Optimization of the physical design parameters, especially the distance between the element and the phantom, is performed to improve the transmission efficiency of. Wireless power transmission using resonance inductive. This paper also provides some ways to improve wireless power transmission efficiency. Jun 07, 2007 at first glance, such a power transfer is reminiscent of relatively commonplace magnetic induction, such as is used in power transformers, which contain coils that transmit power to each other over very short distances. Resonant inductive coupling is also being used in wireless power systems for. Efficient wireless electric power transmission using magnetic.
Investigation of magnetic resonance coupling wireless power. If the resonance frequencies of the transmitter coil and receiver coil are different, the. Section v elaborates the advantages and applications associated with wireless power transmission. The 4coil resonant coupled wpt adopting maximum power transfer principle enables to extend the operating range by the adjustment of two extra mutual coupling.
Graphs of power transmission efficiency for varying distances between the transmission and receiving coils are shown in figures 1 and 2. If you consider an oscillating system like a swing, we. Research article parameters optimization for magnetic. Wireless power transfer via strongly coupled magnetic resonances andre kurs, 1 aristeidis karalis,2 robert moffatt, j. Investigation of magnetic resonance coupling wireless. The concept of magnetic resonance in physics, resonance is the tendency of the system usually a linear system to oscillate with amplitude at certain frequencies named resonant frequency or natural frequency.
Magnetic resonance wireless power transmission technology is based on the phenomenon of resonant coupling to realize noncontact power transmission via near magnetic field. Wireless power transfer via strongly coupled magnetic. Wireless energy transfer by resonant inductive coupling. By applying resonance with in magnetic coupling, the power transfer at. With the development and application of wireless power transmission technology based on magnetic resonance coupling, parameters optimal design and optimal control for the power transmission process have become the focus of research. Wireless energy transfer by resonant inductive coupling master of science thesis rikard vinge. We also discussed the technological developments in wireless power transmission wpt. Magnetic resonance is a special case of magnetic inductance. Levitation system with wireless power transmission using.
To provide high frequency oscillations to switching circuit an ic oscillator is used. The paper will outline our design process and the logical steps we took in the experimentation and design of our circuits. The paper first introduced the magnetic coupling resonance wireless power transfer system principle, the coupling model theory, etc. Pdf wireless power transmission using magnetic resonance. Magnetic plasmon mode resonance and power transmission in a nanosandwich waveguide to cite this article. In conventional inductive coupling, efficiency drops off. The first section of the document will explicitly illustrate the goals. However, demerit of this technology is very short distance for power transmission. These parameters give guidance to the system design, which is verified through examples.
Introduction our project was based upon a mit published paper in the year 2007 titled wireless power transfer via strongly coupled magnetic resonances 1. Automated impedance matching system for robust wireless power. Two coils are used, one is transmitter and other is receiver, magnetic flux is generated this causes emf to induce in receiving coil. Switching circuit contains bjt, s, fet, s or igbt, s. Therefore, many applications are expected in various fields, such as electric vehicles 4, mobile devices 5, microrobots 1, medical sensors and implantable devices 6,7. The circuit theory behind coupledmode magnetic resonance. It is through exploration of the artifact that forms the intellectual. According to such definition, it was possible in a. Wireless power transmission technology using magnetic resonance coupling, offering wireless midrange power transmission, was originally proposed by a research group led by marin soljacic from mit in 2007. In the end this paper gives a lot of practical applications where results of this project can. Magnetic coupling resonance system parameters research of.
Wireless power transmission using magnetic resonance mandip jung sibakoti and joey hambleton cornell college phy312, december 2011, professor derin sherman 1. 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. Through matab program, the paper could get advice system parameters according to the specific load, the needed transmission distance and transmit power of the system. Efficient wireless electric power transmission using. But as the magnetic field decay very quickly, magnetic field is effective only at a very short distance 3. The technologies, listed in the table below, differ in the distance over which they can transfer power efficiently, whether the transmitter must be aimed directed at the receiver, and in the type of electromagnetic energy they use. Systems with a low coupling factor generally use a resonant receiver and resonant transmitter to improve power transfer efficiency.
Investigation of metamaterial transmission line resonators. Wireless power transmission system using magnetic resonant. This specifically leads to the identification of the local and global optimization. As early as 1891, nicola tesla used resonance techniques in his first experiments with inductive power transmission. Magnetic resonance coupling circuits have four general topologies.
Parameters optimization for magnetic resonance coupling. The transmission of wireless power by magnetic resonance. This concept is known as resonance inductive coupling ric. Wireless electricity transmission based on electromagnetic.
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