Coil optimization against misalignment for wireless power transfer

Sampath, J.P.K.; Alphones, Arokiaswami; Vilathgamuwa, D.M.

doi:10.1109/spec.2016.7846159

Cited by 8 publications

(11 citation statements)

References 15 publications

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“…An important design specification is that the diameter of the outer coil of the Rx should match the diameter of the outer coil of the Tx for an optimal power transfer to size ratio. A possible optimization method for the size of the inner Rx coil is detailed in [23]. The referenced method is based on a priori statistical information on the distribution of the misalignment of the UAV.…”

Section: Rx Charging Pad Analysismentioning

confidence: 99%

Electric and Magnetic Design of a Deployable WPT System for Industrial and Defense UAV Applications

Rosu

Badescu

2021

Electronics

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The following paper presents a highly efficient wireless power transfer (WPT) system for unmanned aerial vehicle (UAV) applications. The proposed system is designed as a deployable landing pad, where UAVs can be efficiently charged at distances up to 20 cm, while the UAV is landing. The operation frequency is 50 kHz. The current work presents two major contributions that help improve this aspect: a novel RX charging pad geometry and an unconventional design of a low-voltage, high-power DC–AC inverter using discrete MOSFET transistors. Both the pad’s geometry and the inverter are designed specifically for UAV applications. The input DC to output AC system efficiency peaks at approximately 95%. The peak efficiency is obtained at power transfers of 625 W. A major difference between the present design and traditionally used state-of-the-art systems is the low DC supply voltage requirement of just 24 V, compared with typical values that range from 50 up to 300 V at similar output power.

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Section: Rx Charging Pad Analysismentioning

confidence: 99%

Electric and Magnetic Design of a Deployable WPT System for Industrial and Defense UAV Applications

Rosu

Badescu

2021

Electronics

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“…The maximum achievable energy conversion efficiency of the coil assemblies (designated as and abbreviated as "coil efficiency" in the rest of this paper) is influenced by not only the coil ESRs but also the mutual inductance, and the difficulty in maximizing lies in the fact that both factors are related to the geometric parameters in complex ways. To objectively assess the efficiency performance of a coil assembly design, figure of merits (FOMs) that reflect the combined influence of all relevant factors are a useful criterion [3]. Obviously, the -FOM is heavily reliant on the geometric parameters of the coil assemblies.…”

Section: Introductionmentioning

confidence: 99%

“…Obviously, the -FOM is heavily reliant on the geometric parameters of the coil assemblies. Measures to improve via coil assembly optimization have been widely discussed [3][4].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis-Aided Performance Improvement of Circular Coil Assemblies Applied in Electric Vehicle Inductive Chargers

Zhu¹,

Gao²

2021

Preprint

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Energy efficiency and leakage magnetic field (LMF) are two important issues in inductive chargers. In this work, the maximum achievable coil efficiency and the corresponding LMF strength are formulated as functions of system parameters, and figure of merits (FOM) are proposed for assessing the efficiency and LMF performance of the coil assemblies. The target application is electric vehicle inductive chargers where the LMF is suppressed via passive shielding. The impact of the coil assembly’s geometric parameters on both FOMs is examined through a combination of finite element analysis (FEA) simulation and magnetic circuit analysis, and measures to improve the FOMs are studied Optimization of an exemplary coil assembly within given dimensional limits is conducted and the performance improvement is verified by FEA simulation results. <br>

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“…Therefore, the maximum achievable energy conversion efficiency of the coil assemblies (designated as and abbreviated as "coil efficiency" in the remaining sections) is influenced by not only coil ESRs but also mutual inductance, and the difficulty in maximizing lies in the fact that both are affected by the geometric parameters in complex ways. To objectively assess the efficiency performance of a coil assembly design, figure of merits (FOMs) that reflect the combined influence of all relevant factors are a useful criterion [11]. Obviously, the -FOM is determined by the geometric parameters of the coil assemblies.…”

Section: Introductionmentioning

confidence: 99%

“…Obviously, the -FOM is determined by the geometric parameters of the coil assemblies. Measures to improve via coil assembly optimization have been extensively discussed in previous publications [4,6,11].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis-Aided Optimization of Rectangular Coil Assemblies Applied in Electric Vehicle Inductive Chargers

Zhu¹,

Gao²

2021

Preprint

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Energy efficiency and leakage magnetic field (LMF) are two important issues in electric vehicle inductive chargers. In this work, the maximum achievable coil efficiency and the corresponding LMF strength are formulated as functions of hardware parameters, and figure of merits (FOM) are proposed for assessing the efficiency and LMF performance of the coil assembly pair. The impacts of the coil assemblies’ geometric parameters on both FOMs are examined with the aid of finite element analysis (FEA), and measures to improve the FOMs are extracted from FEA results. A coil assembly pair is manually optimized within given dimensional limits. Compared with the initial design, the optimized one achieves higher efficiency and lower LMF strength while consuming less copper. The performance improvement is verified by FEA results and experimental data measured on an 85 kHz electric vehicle inductive charger prototype. The key measures for coil assembly optimization are summarized.

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Coil optimization against misalignment for wireless power transfer

Cited by 8 publications

References 15 publications

Electric and Magnetic Design of a Deployable WPT System for Industrial and Defense UAV Applications

Electric and Magnetic Design of a Deployable WPT System for Industrial and Defense UAV Applications

Finite Element Analysis-Aided Performance Improvement of Circular Coil Assemblies Applied in Electric Vehicle Inductive Chargers

Finite Element Analysis-Aided Optimization of Rectangular Coil Assemblies Applied in Electric Vehicle Inductive Chargers

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