Comparison of coil topologies for inductive power transfer under the influence of ferrite and aluminum

Knaisch, Katharina; Springmann, Markus; Gratzfeld, Peter

doi:10.1109/ever.2016.7476339

Cited by 25 publications

(21 citation statements)

References 14 publications

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“…The overall system design itself relies on the magnetic parameters of the respective coil system. Different coil geometries and arrangements are possible depending on the use case, which is shown by a comparison in [12] and [13]. An alternating current in the primary coil leads to an alternating magnetic field.…”

Section: Coil Systemmentioning

confidence: 99%

Contribution to the System Design of Contactless Energy Transfer Systems

Maier

Heinrich

Zimmer

et al. 2019

IEEE Trans. on Ind. Applicat.

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In this contribution, a design procedure that is applicable to many kinds of wireless or contactless energy transfer systems is proposed. The design procedure is limited to near field wireless energy transfer systems in resonant operation. For this purpose, the input impedance and voltage transfer function of different natural frequencies are calculated analytically, and moreover, the behavior of the system is described. Following three issues lead to a readily applicable design procedure. First, the knowledge of the transfer functions. Secondly, the knowledge of basic magnetic properties and lastly, the known influence of harmonics according to rectifier and inverter. This design procedure is demonstrated with two hardware setups. Index Terms-Inductive charging, inductive power transmission, power conversion harmonics, resonant inverters, transfer functions.

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Section: Coil Systemmentioning

confidence: 99%

Contribution to the System Design of Contactless Energy Transfer Systems

Maier

Heinrich

Zimmer

et al. 2019

IEEE Trans. on Ind. Applicat.

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show abstract

“…Similarly, square DD coils were also implemented with a circular form to increase the tolerance to lateral misalignment [13]. The work reported in [14] explained the interrelation between the coupling factor and geometry of ferrite and aluminum. In [15], Kim et al designed an asymmetric coil structure with the variation of width and an additional inner coil to achieve a higher quality factor than that of a conventional uniform one.…”

Section: Introductionmentioning

confidence: 99%

Capacitance Tuning Method for Maximum Output Power in Multiple-Transmitter Wireless Power Transfer System

Jeon

Seo

2020

IEEE Access

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It is common knowledge that wireless power transfer (WPT) systems with multiple transmitters (Txs) and a single receiver (Rx) have robust efficiency against lateral misalignment. However, the unnecessary coupling among Txs in actual multi-Tx WPT systems causes transmission efficiency degradation, and then additional tuning work is required to adjust some system parameters, such as the phase or frequency of Tx sources. Moreover, the frequency-splitting phenomenon caused by over-coupling between the Txs and Rx still occurs in multi-Tx systems. Thus, output power degradation is inevitable in the over-coupled state. In this paper, we propose an optimal capacitance tuning method that is applicable to multi-Tx WPT systems. A multi-Tx WPT system tuned with the optimal capacitances, which are obtained from the critical coupling condition between Txs and Rx, not only compensates the inner coupling among Txs but also achieves the maximum output power in the over-coupled state. To verify the validity of the proposed method, we implemented two-and three-Tx and single Rx WPT systems and measured the output power of load with respect to the Rx position along the x-and y-axes. As a result, with the proposed method without any changes in the operating frequency or phase, the systems could deliver higher output power than the conventional phase-controlled system. In particular, with the proposed method, the systems maintained the constant maximum transmission efficiency of 80% in the over-coupled state. INDEX TERMS magnetic beamforming, multiple transmitter, maximum output power, optimal tuning, power transfer efficiency, transmission efficiency, wireless power transfer.

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“…If the electromagnetic field is too high, electromagnetic security problem will be caused. At the same time, eddy current in the shielding mechanism is generated by the electromagnetic field, and the eddy will produce heat in the nonmetallic shielding and cause the loss of energy [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…In 2016, Katharina Knaisch's team at Karlsruhe Institute of Technology studied the effects of electrical shielding on the main parameters of wireless charging systems. The self-inductance and mutual inductance of electric shielding decreased, the coupling coefficient increased, and the internal magnetic induction of electric vehicles decreased by 9μT [7].…”

Section: Introductionmentioning

confidence: 99%

Edge Effect and Coil Optimization of Wireless Power Transmission System for Electric Vehicle Charging

Wang¹,

Huang²,

Kong³

et al. 2019

Proceedings of the 2019 2nd International Conference on Mathematics, Modeling and Simulation Technologies and Applications (MMS

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In order to prevent the leakage of the electromagnetic field and control the electromagnetic field within the limit of the safety limit, the electromagnetic shielding device will be installed in the coupling mechanism of the wireless power energy transmission system. The edge effect will be produced in the back of the primary equipment and the secondary side equipment. This paper mainly introduces the edge effect of the wireless power energy transmission shielding machine and the reasons for it. The consequences are analyzed, and the coupling mechanism is optimized to reduce the edge effect. In this paper, a new shielding structure is designed, which not only reduces the edge effect, but also ensures the security of the system.

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Comparison of coil topologies for inductive power transfer under the influence of ferrite and aluminum

Cited by 25 publications

References 14 publications

Contribution to the System Design of Contactless Energy Transfer Systems

Contribution to the System Design of Contactless Energy Transfer Systems

Capacitance Tuning Method for Maximum Output Power in Multiple-Transmitter Wireless Power Transfer System

Edge Effect and Coil Optimization of Wireless Power Transmission System for Electric Vehicle Charging

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