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Proceedings ArticleDOI

Design of a Universal Wireless Charging System for Mobile and Laptop Applications

TL;DR: This paper provides the better coil-structure for a feasible UWC system for mobile and laptop applications, in which two segmented coils are connected series in fashion by means of electronic switches.
Abstract: Advancement in the VLSI industry has brought out the drastic demand for numerous electronic devices such as mobiles, notepads, and computers etc. Its long charging cables create an inconvenience for the users. To replace such cables, an elegant wireless charging technique has been introduced to the current electronic industry. In this paper, a universal wireless charging system (UWCS) is designed, in which two segmented coils are connected series in fashion by means of electronic switches. The UWCS, on the whole, is suitable for laptop application and a small part of its design is used for the mobile application. As per the load requirement, the switching conditions of UWCS gets automatically changes. In UWCS, misalignment is the recurrently occurring dispute which diminishes the coupling factor between transmitter and receiver pads. In such systems, selection of proper coil structure is the preliminary significant part of its design. In this paper, several coil structures are chosen and simulated under various misalignment cases. The misalignment's effect and the shape of coil structure on various parameters of the wireless charging system are detailed in the paper. In addition, the variation of magnetic fields between transmitter and receiver pads for distinct misalignment cases are observed and analyzed in this paper. Thus, this paper provides the better coil-structure for a feasible UWC system for mobile and laptop applications.
Citations
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Patent
14 Feb 2003
TL;DR: In this article, an apparatus for inductively transferring power to movable consumers is described, which extends in the form of a conductor loop along a trajectory of a predetermined consumer, disposed on the consumer it is capable of power therefrom drawn by the secondary conductor, comprising at least one primary conductor.
Abstract: Disclosed is an apparatus for inductively transferring power to movable consumer, it extends in the form of a conductor loop along a trajectory of a predetermined consumer, disposed on the consumer it is capable of power therefrom drawn by the secondary conductor, comprising at least one primary conductor. To produce a simple and inexpensive variable route layout, the device, galvanically (galvanically) isolated two conductor loops are provided, it is assigned to different sectors of the track Te, so that it can be power distributed to the consumer that is transmitted by inductive coupling conductor loop to at least one second conductor loop from the first conductor loop is arranged relative to each other . Sectors of the two conductor loops which is inductively coupled to form a transformer, which is preferably provided with a two-piece ferromagnetic core. Movable consumer is guided on a rail, one sector of the inductively coupled by conductor loop, the movable portion of the rail switch with only such binding occurs last position of the rail switch with, It is connected.

155 citations

References
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Journal ArticleDOI
TL;DR: A circuit model is presented along with a derivation of key system concepts, such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes undercoupled, including the introduction of key figures of merit.
Abstract: Wireless power technology offers the promise of cutting the last cord, allowing users to seamlessly recharge mobile devices as easily as data are transmitted through the air. Initial work on the use of magnetically coupled resonators for this purpose has shown promising results. We present new analysis that yields critical insight into the design of practical systems, including the introduction of key figures of merit that can be used to compare systems with vastly different geometries and operating conditions. A circuit model is presented along with a derivation of key system concepts, such as frequency splitting, the maximum operating distance (critical coupling), and the behavior of the system as it becomes undercoupled. This theoretical model is validated against measured data and shows an excellent average coefficient of determination of 0.9875. An adaptive frequency tuning technique is demonstrated, which compensates for efficiency variations encountered when the transmitter-to-receiver distance and/or orientation are varied. The method demonstrated in this paper allows a fixed-load receiver to be moved to nearly any position and/or orientation within the range of the transmitter and still achieve a near-constant efficiency of over 70% for a range of 0-70 cm.

1,630 citations


"Design of a Universal Wireless Char..." refers methods in this paper

  • ...Similarly, the near-filed technique utilizes an inductive (in order of milli-meters) or a magnetic resonance (in order of centi-meters) coupling methods to transfer power over small and medium airgaps, respectively [9-11]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the technologies in the wireless power transfer (WPT) area applicable to electric vehicle (EV) wireless charging, and the obstacles of charging time, range, and cost can be easily mitigated.
Abstract: Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires. In fact, the WPT adopts the same basic theory which has already been developed for at least 30 years with the term inductive power transfer. WPT technology is developing rapidly in recent years. At kilowatts power level, the transfer distance increases from several millimeters to several hundred millimeters with a grid to load efficiency above 90%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper reviewed the technologies in the WPT area applicable to EV wireless charging. By introducing WPT in EVs, the obstacles of charging time, range, and cost can be easily mitigated. Battery technology is no longer relevant in the mass market penetration of EVs. It is hoped that researchers could be encouraged by the state-of-the-art achievements, and push forward the further development of WPT as well as the expansion of EV.

1,603 citations


"Design of a Universal Wireless Char..." refers methods in this paper

  • ...Similarly, the near-filed technique utilizes an inductive (in order of milli-meters) or a magnetic resonance (in order of centi-meters) coupling methods to transfer power over small and medium airgaps, respectively [9-11]....

    [...]

Journal ArticleDOI
William C. Brown1
TL;DR: The history of power transmission by radiowaves is reviewed from Heinrich Hertz to the present time with emphasis upon the free-space microwave power transmission era beginning in 1958 as mentioned in this paper.
Abstract: The history of power transmission by radiowaves is reviewed from Heinrich Hertz to the present time with emphasis upon the free-space microwave power transmission era beginning in 1958. The history of the technology is developed in terms of its relationship to the intended applications. These include microwave powered aircraft and the Solar Power Satellite concept.

1,562 citations

Journal ArticleDOI
TL;DR: This paper overviews theoretical and practical design issues related to inductive power transfer systems and verifies the developed theory using a practical electric vehicle battery charger.
Abstract: This paper overviews theoretical and practical design issues related to inductive power transfer systems and verifies the developed theory using a practical electric vehicle battery charger. The design focuses on the necessary approaches to ensure power transfer over the complete operating range of the system. As such, a new approach to the design of the primary resonant circuit is proposed, whereby deviations from design expectations due to phase or frequency shift are minimized. Of particular interest are systems that are neither loosely nor tightly coupled. The developed solution depends on the selected primary and secondary resonant topologies, the magnetic coupling coefficient, and the secondary quality factor.

1,389 citations


"Design of a Universal Wireless Char..." refers methods in this paper

  • ...Similarly, the near-filed technique utilizes an inductive (in order of milli-meters) or a magnetic resonance (in order of centi-meters) coupling methods to transfer power over small and medium airgaps, respectively [9-11]....

    [...]

Patent
04 May 1907

544 citations