Research and design of coupled magnetic resonant power. The receiver unit further includes a regulator circuit configured to provide a constant power to an. The objective of this chapter is to study the fundamentals and operating principles of inductively coupled wireless power transfer icwpt systems. As can be shown, the inductively coupled power transfer icpt system can be divided by primary and secondary sides. Wireless power transfer through inductive coupling mohamed a.
Detailed in this paper is a multiport power electronics interface which serves as an energy router for onboard electric and plugin hybrid electric vehicles with inductively coupled power transfer icpt and hybrid energy storage systems hess. Communication protocols in wireless power transfer systems, however, have hardly been discussed in previous studies 68. Resonant inductive coupling wireless power transfer author. Magnetic design considerations to improve nonlinear.
The design approach of the system is also presented in this paper. Primary unit control of resonant inductive power transfer system for optimum efficiency. In this paper we are considering about the wireless power transmission using inductive coupling method. Stability and control of inductively coupled power.
The inductively coupled power transfer technology icpt is a new power transmission technology, which can transmit electric energy without physical connection. In inductivelycoupled power transfer for electromechanical systems 2, a similar approach of using separable core transformers is examined for several power transfer applications. A criterion proposed for inductive coupling and magnetic. Wireless power transfer technologies are of great practical interest especially in the development of intelligent systems 1. Inductive power transfer ipt based systems have been used extensively in systems involving the transportation of people and materialsboys and green, 1995. Recent advances in circuits wireless power transfer. Design and control of typical ipt systems have been well known and reported in literature 23. Selection of maximum power transfer region for resonant.
A wireless power transfer system using an inductive link has been demonstrated for implantable sensor applications. The conduit of transfer of power can be either physical wires, cables etc. Introduction inductive power transfer ipt without a magnetic core was. Inductive coupling the basics the state of wireless. Theory of image impendence matching for inductively coupled power transfer systems, ieee. Contact less power transfer system employ power converters to generate a high frequency current in a primary coil to magnetically coupled to one or more secondary coil across a large air gap without direct electric. Inductively coupled power transmission icpt is becoming an accepted technique for transferring power from an extended loop track to a number of. The vehicle further includes at least one controller that, in response to an inductive charge request, causes the panels to move to positions selected to minimize. Inductive power transfer ipt powering our future grant covic professors grant covic and john boys power electronics research group department of electrical and computer engineering the university of auckland, new zealand.
In addition, the switching network consists of two switch pairs s1, s4 and s2, s3 and their fundamental inverse parallel diodes sd1sd4. In particular, the control of multiple pickup coils and the number of such pickups that may be used. This paper describes the development trend of inductive power transfer systems since the 1970s, focusing on the transmission frequency, transmission power, and the coupling coe. Moreover, in the case of the zpickup, it is possible to benefit from the positive mutual coupling if an alternatedirection configuration is. Design and optimization of an inductively coupled power transfer. The paper discusses the magnetic features of various pickup arrangements of inductively coupled power transfer systems. Modeling and analysis of inductively coupled power. Nowadays icpt systems are widely used in low and highpower applications in both domestic and industrial markets klontz et al. Power transfer of inductive coupling happens by creating an alternating magnetic field on the transmitter coil, that magnetic flux is then converted into an electrical current in the receiver coil.
Operation of icpt systems is discussed and limiting factors in their operation are investigated. In this paper a model of coupled magnetic resonant power transfer system is established and the features of the system is analyzed and a device based on eclass amplifier is designed to verify the theoretical analysis. A power and data decoupled transmission method for wireless power transfer systems via a shared inductive link article pdf available in energies 118. Multiobjective optimization of inductive power transfer. The parameter identification of the inductively coupled power transfer icptsystem is of great significance for the high performance control, efficiency optimization and safe operation of the system. A vehicle includes an inductive charge coupling arrangement that can be electrically connected with a traction battery. The results of that paper confirmed that dual control offers a number of advantages compare to others method. Indeed, the efficiency in high power transfer is a crucial point for ecological and thermal dissipation reasons. A loosely coupled planar wireless power transfer system. This work details the design and implementation of inductive power transfer systems, including the. To ensure the stability of power transfer, a special mooring cable is.
Achieving maximum power transfer of inductively coupled. Circular pad has power null at 80% of pad radius 2, only 46% usable collapse of magnetic energy around power. Since then, electromagnetic induction emi has been used for the powering of. But conventional methods of power transfer to the vehicle such as. Pdf fundamentals of inductively coupled wireless power. From the femsimulation, over power electronics analysissimulation and mechanical integration to the reali zation of complete prototypes. Development of a wireless power transfer system using. It is always important to have a stable system under full range of load and magnetic coupling variations in practical applications. The power converter can maintain highfrequency resonance by natural circuit oscillation and discrete energy injection control. The receiver unit includes a coil that wirelessly and inductively couples with the electromagnetic field of the primary unit to receive power therefrom. Inductively coupled power transfer icpt for electric. Resonant inductive coupling is also being used in wireless power systems for. Pdf a power and data decoupled transmission method for. At the primary side, the dc input edc and filter compose a quasi current source.
The load current control of inductively coupled power transfer. Stability and control of inductively coupled power transfer system. It provides a rapid charging process, and optimized power transmission by frequency variation and control over the loss due to low magnetic coupling. A wireless power transfer system based on inductive coupling. This new technology can be used in various wireless power transfer applications with different specifications, necessities, and restrictions such as in electric vehicles and consumer electronics. Although the use of inductively coupled power transfer icpt systems for electric vehicle battery charge presents numerous advantages, a detailed design method cannot be found in the literature. In recent years, inductive power transfer ipt systems have been actively studied.
Faradays law of induction states, a discontinuous field of magnet can stimulate an electromotive force emf in a. Pdf the objective of this chapter is to study the fundamentals and operating principles of inductively coupled wireless power. P a g e 1 summary of an inductive power transfer system the two key principles after the procedure of every system of magnetic induction wireless power transfer wpt, or inductive power transfer ipt, are the faradays law of induction and amperes circuital law. An universal, inductively coupled battery charger for. The performance of the standard monorail system containing an epickup can be improved by using s or zshaped magnetic circuits. A resonant transformer of this type is often used in analog circuitry as a bandpass filter. Fundamentals of inductively coupled wireless power. Request pdf stability and control of inductively coupled power transfer system inductively coupled power transmission icpt is becoming an accepted. Parameters assessment of the inductivelycoupled circuit. To improve the performance of the reported results, we devote substantial e ort into circuit design and optimization. Wireless energy transfer by resonant inductive coupling. In this paper, the maximum power transfer performances of four basic topologies labeled as ss, sp, ps and pp are investigated.
The transmitter is based on a fullbridge phase shift inverter, while the inductive link is composed of two lc resonators as loosely coupled inductors. Inductively coupled power transfer how is inductively coupled power transfer abbreviated. The system requires no complex external control system but relies on its natural impedance response to achieve the desired power. Magnetic design we use a computerbased system design algorithm. In particular, the control of multiple pickup coils and the number of such pickups that may be. Eth zurich presented by roman bosshard msc eth born on 20. Product overview inductive power transfer ipt nductix. Development trends of inductive power transfer systems. Multiobjective optimization of inductive power transfer systems for ev charging a thesis submitted to attain the degree of doctor of sciences of eth zurich dr. Contactless power transfer techniques are also applicable to galvanically isolated o ine power supplies 8. Pdf design of inductively coupled power transfer systems.
Wireless power transfer is one of the simplest and inexpensive ways of charging as it eliminate the use of conventional copper cables and current carrying wires. The results of this paper could provide a useful reference to design wireless power transfer system. Ipt control technique with only a single controller 24 have. A development of class e converter circuit for loosely.
Just imagine the future with wireless electricity, where there will be no need of cables and transmission lines. However, technology limitations of the day resulted in unsuccessful experiments and myths developed that to transfer power wirelessly was in fact impossible. Index termsclasse, inductive coupling, wireless power transfer, inductive power transfer, semiresonant i. A highefficiency wireless power transfer system which is capable of supporting more than one receiver using class e operation for transmitter via inductive coupling has been designed and fabricated. Modeling and pareto optimization of inductive power. The aim of an inductively coupled wireless power transfer icwpt system is to provide power to a movable object across a gapped magnetic structure. Primary unit control of resonant inductive power transfer. Stability and control of inductively coupled power transfer systems.
Inductive power transfer system integration for battery. Design of magnetic coupler for wireless power transfer mdpi. Inductive power transfer offers the capability to inductively contactless transmit power in moving components. 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. Circuitmodel based analysis of wireless energy transfer. In order to uphold the maximum power transfer in a resonant inductively coupled wireless power transfer system, an operating region has been proposed based on the coupling coefficient, frequency and electric load. The inductively coupled power transfer icpt technology has made signi. As an emerging research field, inductively coupled wireless power transfer icwpt technology has attracted wide spread attention recently. Magnetic resonant coupling based wireless power transfer. The effectiveness of the proposed condition has been examined both theoretically and. The system consists of a transmitter resonant inverter, a electromagnetic induction link, and a receiver rectifier. In our research work, a technique is devised for a wireless power transfer through inductive.
The existing body of literature on hesss lacks a unified controller and modular, flexible structure as well as integration of icpt. By modeling the equivalent circuits of these topologies in high frequency hf, the primary resonance compensation. The purpose of this study is arameters assessment of the optimum pthe inductivelycoupled circuit, such as inductance, coil resistance and selfcapacitance for a wireless power trans fer. The arrangement includes a charge coil and a plurality of permeable panels surrounding the charge coil. This paper presents results of an analytical investigation of the aforementioned relationships unique to batteryelectric vehicles and proposes inductively coupled power transfer icpt as a potential solution and decoupling method for the vehicle range 1 vehicle cost relationship. Inductively coupled power transfer how is inductively. Boys, design and optimisation of magnetic structures for lumped inductive power transfer systems, in ieee energy conversion congress and exposition, 2009. Resonant inductive coupling ric the transmission of wireless power transfer using electromagnetic induction was first demonstrated in the early 20th century by nikola tesla.
The inductive coupled power transfer icpt, similar to a conventional transformer, is made of two magnetically coupled coils. Inductively coupled power transmission icpt is becoming an accepted technique for transferring power from an extended loop track to a number of galvanically isolated movable pickup coils. The parameter identification of the inductively coupled power transfer icpt system is of great significance for the high performance control, efficiency optimization and safe operation of the system. Wireless energy transfer, resonant inductive coupling, induction, resonantcircuits,ferrite. A maximum efficiency point tracking control scheme based. The inductively coupled power transfer icpt method is known worldwide for its high power transfer in many applications, mainly in electric vehicles. Contactless transfer offers a number of benefits in a variety of applications. Introduction in recent years, inductive power transfer ipt systems have attracted much attention in terms of safety and convenient battery chargers for electrical vehicles evs 15.
An inductive linkbased wireless power transfer system for. An inductively coupled power transfer system has a pair of coupled coils. The radiated field must be limited to meet magnetic radiation guidelines and to ensure the safety of users. Electrical and magnetical modeling of inductive coupled. Us201600331a1 inductive wireless power transfer system. Inductive power transfer system page 1 summary of an. Fundamentals of inductively coupled wireless power transfer. Inductive power transfer ipt medium medium 1050 khz capacitive power transfer cpt low medium 100500 khz. Transferred power control for icpt pickups utilizing dynamically. Integration of inductively coupled power transfer and.
1023 152 720 1176 1471 1474 1274 471 1531 495 792 657 418 1359 1418 1228 937 479 1366 277 882 1513 1176 155 415 283 1229 579 349 276