Design of a Patterned Soft Magnetic Structure to Reduce Magnetic Flux Leakage of Magnetic Induction Wireless Power Transfer Systems

Lee, In-Gon; Kim, Nam; Cho, In‐Kui; Hong, Ic‐Pyo

doi:10.1109/temc.2017.2690967

Cited by 45 publications

(17 citation statements)

References 14 publications

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“…The main reason for EMI is that the current flows through the coil to produce a magnetic field, which can also be confirmed by the newly added magnetic field strength formula (15). Therefore, the quantification of EMI can be transformed into the study of the magnitude of the harmonic current flowing through the coil.…”

Section: Quantification Of Emimentioning

confidence: 96%

“…Thespace shielding schemes do not reduce the total electromagnetic emission of thesystem but do reduce the electromagnetic interference of the system to theenvironment through shielding, absorbing or cancelling the electromagnetic waves inthe electromagnetic propagation path. These types of methods include conductiveshielding, magnetic shielding, and passive coil shielding [15–19]. Conductiveshielding provides electromagnetic shielding by adding a soft magnetic metal.Conductive shielding is more effective than the magnetic shielding and passive coilshielding, but it significantly reduces the efficiency of the system due to thepresence of an eddy current.…”

Section: Introductionmentioning

confidence: 99%

“…Conductiveshielding provides electromagnetic shielding by adding a soft magnetic metal.Conductive shielding is more effective than the magnetic shielding and passive coilshielding, but it significantly reduces the efficiency of the system due to thepresence of an eddy current. To solve this problem, a patterned soft magnetic metalis used to cut the route of the induced current, which decreases the power loss andmagnetic field leakage [15]. For passive coilshielding, a type of null‐coupled cancelling coil can shield electromagnetic fieldsin WPT systems [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of wireless power transfer system with inputfilter

Zhao

2020

IET Power Electronics

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For power electronic systems, adding filters to eliminate harmonic interference is a general and effective method, but the position and parameters of filters in wireless power transmission (WPT) system will greatly affect the system characteristics of WPT. The main reason for the harmonic interference in WPT is that the harmonics in the output square wave are loaded on the resonant coil of the transmitter, so in this study, a method of harmonic elimination by adding a second-order LCR filter to the resonant part (LCR-WPT) is studied. However, the WPT resonant part is precisely matched and designed; if a filter is added at the resonant part, it inevitably affects the resonance state, system output power and efficiency of the WPT. To ensure that the LCR-WPT has good system characteristics, this study analyses the mathematical model of the LCR-WPT and deduces a design method for the filter and an efficiency optimisation formula. This study also introduces LCR-WPT applications in two different control schemes. The experimental results show that the harmonic interference of the system is significantly attenuated after the filter is added; additionally, the efficiency of the system decreases by <10%, and the system still maintains sufficient output power.

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Section: Quantification Of Emimentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of wireless power transfer system with inputfilter

Zhao

2020

IET Power Electronics

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“…In total, researchers reduce ECL by optimizing the operating frequency, coils' diameter, or turn number. In [14,15], the researchers analyzed EMF around the underwater WPT system and optimized the power transmission coils and the operating frequency, respectively. Besides, it is an effective way to enhance the power transfer efficiency by making use of ferrite cores to increase mutual inductance and decrease ECL.…”

Section: Introductionmentioning

confidence: 99%

Application of Shielding Coils in Underwater Wireless Power Transfer Systems

Wang

Song

Mao

2019

JMSE

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Underwater wireless power transfer (WPT) technology can enhance the endurance of the autonomous underwater vehicles (AUV). WPT that based on electromagnetic theory will generate eddy current loss (ECL) in seawater. In this paper, we make use of shielding coils to weaken the electromagnetic field (EMF) in seawater, which can reduce ECL and improve the transfer efficiency. Simplified circuit models were proposed to provide an intuitive and comprehensive analysis of the transfer efficiency and the finite element analysis (FEA) was used to simulate the distribution of EMF. We learn that the system with shielding coils performs better when the operating frequency is relatively high by comparing the power transfer efficiency of the underwater WPT systems with and without the shielding, and its maximum efficiency is higher than the system without shielding. The effect of the shielding coils has the similar influence when compared with the metallic plate. While considering the efficiency and weight of coils, the results show that the shielding coils can be used in the underwater WPT system to improve the power transfer efficiency.

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“…This procedure is very complicated and thus the material is very expensive [6]. Recently, there have been researches on enhancing the disadvantages of the prior art by minimizing the eddy current loss through structural modification of the soft magnetic metal, but there is a limitation in that the structure is optimized according to the type of the coil applied [7].…”

Section: Introductionmentioning

confidence: 99%

Design of a Mu-Near-Zero metamaterial for reducing the backward magnetic flux leakage of a wireless power transfer system

Lee

Kim

Cho

et al. 2018

IEICE Electron. Express

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This study proposed a design for a metamaterial that has the Mu-Near-Zero property in a certain frequency band in order to reduce the magnetic flux leakage of a wireless power transfer system. The proposed structure had spiral coils arranged in a strip line on a dielectric substrate and used a capacitor connected in parallel to induce magnetic resonance and attain the Mu-Near-Zero property. In this way, magnetic fields are reflected and thus become less likely to leak to the rear of the coils. To verify the performance of the proposed structure, the designed metamaterial was positioned at the rear of the transmission coil, and the efficiency of the transmission and receiver coils and the strength of the leaking magnetic fields were observed. The transmission efficiency at a 0.3 m distance between the transmission and receiver coils was 40.8%, which was similar to that of the conventional structures, and the reduction of magnetic flux leakage improved by a maximum of 79.7%.

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Design of a Patterned Soft Magnetic Structure to Reduce Magnetic Flux Leakage of Magnetic Induction Wireless Power Transfer Systems

Cited by 45 publications

References 14 publications

Design of wireless power transfer system with inputfilter

Design of wireless power transfer system with inputfilter

Application of Shielding Coils in Underwater Wireless Power Transfer Systems

Design of a Mu-Near-Zero metamaterial for reducing the backward magnetic flux leakage of a wireless power transfer system

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