A Coil Design and Control Method of Independent Active Shielding System for Leakage Magnetic Field Reduction of Wireless UAV Charger

Kim, Jedok; Ahn, Jangyong; Huh, Sungryul; Kim, Kibeom; Ahn, Seungyoung

doi:10.1587/transcom.2019mci0001

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Recently, the utilization of wireless power transfer (WPT) technologies has been considered for several different applications, such as medical devices and unmanned aerial vehicles (UAVs) [224].…”

Section: Wireless Power Transmissionmentioning

confidence: 99%

Comprehensive Survey of Research on Emerging Communication Technologies from ICETC2020

Tachibana

2022

IEICE Trans. Commun.

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Section: Wireless Power Transmissionmentioning

confidence: 99%

Comprehensive Survey of Research on Emerging Communication Technologies from ICETC2020

Tachibana

2022

IEICE Trans. Commun.

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“…TX and RX generate and , and inner TS and RS generate and . These magnetic fields are in phase relative to each other, and the total leakage EMF at point p − can be calculated by vector summation of the in phase magnetic field according to (14) assuming that they are ideally in phase. Note that ∅ and ∅ are the current phases of the and coils.…”

Section: Shielding Effectiveness Calculationmentioning

confidence: 99%

“…The active shielding is to eliminate the leakage EMF by generating a shielding EMF having the opposite vector direction to that of the leakage EMF. The active shielding generates a shielding EMF by its own power source, and there are two types of power supply methods: 1) dependent active shielding, and 2) independent active shielding [12][13][14]. The dependent active shielding allocates a partial shield coil having reverse winding to the TX and RX coils, respectively [12].…”

Section: Introductionmentioning

confidence: 99%

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Dual Loop Reactive Shield Application of Wireless Power Transfer System for Leakage Magnetic Field Reduction and Efficiency Enhancement

Kim

Ahn

2021

IEEE Access

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The wireless power transfer (WPT) system generates a high density leakage electromagnetic field (EMF) during its operation. Exposure to leakage EMF has adverse effects on human health. In order to reduce the leakage EMF, a shielding method can be applied to the WPT system. The shielding methods in previous studies reduced leakage EMF, but the power transfer efficiency (PTE) of the WPT system was decreased. Therefore, a shielding method providing high shielding effectiveness (SE) without PTE degradation is necessary. This paper proposes a dual loop reactive shield application for reducing leakage EMF with PTE enhancement. The proposed dual loop reactive shield generates in phase and out of phase magnetic fields simultaneously. The out of phase magnetic field depresses leakage EMF, and the in phase magnetic field increases the PTE. The proposed method is verified for the cases of symmetric and asymmetric WPT systems, including misalignment conditions. The experimental results of the symmetric WPT system showed a 2.1% PTE increase with 55.5% SE in an alignment condition, and a 3.9% PTE increase with 53% SE in a misalignment condition. In addition, the experimental results of the asymmetric WPT system presented a 1.6% PTE increase with 61.3% SE in an alignment condition, and a 2.7% PTE increase with 54.1% SE in a misalignment condition.

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“…Lastly, active shielding methods intentionally generate canceling EMFs with the desired magnitude and phase. Under these operating conditions, active shielding methods have a higher SP than reactive shielding methods [6].…”

Section: Introductionmentioning

confidence: 99%

An Active Shielding Control Method for a Wireless Power Transfer System under Misalignment Conditions

Ahn

Kim

Park

et al. 2022

J Electromagn Eng Sci

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This paper proposes a control method for an active shield system using an independent power source under misalignment conditions. The proposed method controls the current strength and phase of the shielding system according to magnetic field leakage characteristics with high shielding performance (SP) under misalignment conditions. The current strength and phase of the shielding system were determined by the current strength and mutual inductance of the wireless power transfer (WPT) and shielding coils. Additionally, we considered x and y misalignment conditions and analyzed SP and power transfer efficiency (PTE). The proposed method was verified through simulations and experiments in terms of SP and PTE. The experiments confirmed that, due to the shielding system control, SP increased from 49.22% to 61.74% under misalignment conditions, but there was no additional PTE reduction due to shielding coil control under these conditions.

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A Coil Design and Control Method of Independent Active Shielding System for Leakage Magnetic Field Reduction of Wireless UAV Charger

Cited by 8 publications

References 15 publications

Comprehensive Survey of Research on Emerging Communication Technologies from ICETC2020

Comprehensive Survey of Research on Emerging Communication Technologies from ICETC2020

Dual Loop Reactive Shield Application of Wireless Power Transfer System for Leakage Magnetic Field Reduction and Efficiency Enhancement

An Active Shielding Control Method for a Wireless Power Transfer System under Misalignment Conditions

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