Characteristics analysis on a superconductor resonance coil WPT system according to cooling vessel materials in different distances

Jeong, In-Sung; Lee, Yu-Kyeong; Choi, Hyo-Sang

doi:10.1016/j.physc.2016.08.012

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Jeong et al compared multiple vessel materials under various air gap lengths[132]. The system comprised copper source, load coils and two YBCO coils (Yttrium barium copper oxide) in the transmitting sub-system.…”

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confidence: 99%

A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

210

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Electric vehicles (EVs) have recently been significantly developed in terms of both performance and 10 drive range. There already are various models commercially available, and the number of EVs on road 11 increases rapidly. Although most existing EVs are charged by electric cables, companies like Tesla, 12 BMW and Nissan have started to develop wireless charged EVs that don't require bulky cables. 13 Rather than physical cable connection, the wireless (inductive) link effectively avoids sparking over 14 plugging/unplugging. Furthermore, wireless charging opens new possibilities for dynamic chargingcharging while driving. Once realised, EVs will no longer be limited by their electric drive range and the requirement for battery capacity will be greatly reduced. This has been prioritised and promoted worldwide, particularly in UK, Germany and Korea. This paper presents a thorough literature review on the wireless charging technology for EVs. The key technical components of wireless charging are summarised and compared, such as compensation topologies, coil design and communication. To enhance the charging power, an innovative approach towards the use of superconducting material in coil designs is investigated and their potential impact on wireless charging is discussed. In addition, health and safety concerns about wireless charging are addressed, as well as their relevant standards. Economically, the costs of a wide range of wireless charging systems has also been summarised and compared.

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mentioning

confidence: 99%

A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

210

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“…In order to calculate the losses from HTS tape under the action of AC current and AC magnetic field, the H-formulation is chosen as the suitable FEM method, which is able to compute the hysteresis losses, ferromagnetic losses and eddy-current losses for different layers of HTS tape [9]. The H-formulation consists of Faraday's law (2), Ampere's law (3), Ohm's law (4), constitutive law (5), and E-J power law (6) [23,24]:…”

Section: H-formulationmentioning

confidence: 99%

“…Superconducting coils fabricated from a high temperature superconductor (HTS) are capable of carrying tremendous electrical current density and of creating a favourable magnetic field, to be used in various superconducting applications such as magnetic resonance imaging (MRI), superconducting motors [1], and even for superconducting wireless power transmissions [2][3][4][5][6][7][8]. However, when HTS applications are operating with alternating current (AC), superconductors also sustain AC losses [9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of AC losses in horizontally parallel HTS tapes

Shen

Geng

et al. 2017

Supercond. Sci. Technol.

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This paper presents an AC loss study of horizontally parallel HTS tapes. We proposed to use three parallel HTS tapes as an example. The AC losses of the middle and end tape of three parallel tapes have been measured using the electrical method and compared to those of an individual tape. The effect of the interaction between tapes on AC losses has been analysed, and compared with finite-element method (FEM) simulations using the 2D H-formulation implemented in COMSOL Multiphysics. By using FEM simulations, the cases of increasing number of parallel tapes have been considered, and the normalised ratio between the total average AC losses per tape and the AC losses of an individual single tape has been calculated for different gap distances. We proposed a new parameter, N s , a turning point for number of tapes, to divide Stage 1 and Stage 2 for the AC loss study of horizontally parallel tapes. For Stage 1, N < N s , the total average losses per tape increased with the increasing number of tapes. For Stage 2, N > N s , the total average losses per tape started to decrease with the increasing number of tapes. The analysis demonstrates that horizontally parallel HTS tapes could be potentially used into superconducting devices like HTS transformer, which could retain or even reduce the total average AC losses per tape with large number of parallel tapes.

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“…Compared with the conventional wired power transmission, WPT has merits like no mechanical contact, spark-free, weatherproof, clean and tidy, etc. [4][5][6][7][8][9]. It is promising to be the most popular energy transmission mode in the near future.…”

Section: Introductionmentioning

confidence: 99%

Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

Diao

Mei

et al. 2023

Electronics

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This paper proposes an active resonant network based on variable resonant capacitances to improve the operating performance of the LCC-S compensated topology in the wireless power transfer (WPT) system for electric vehicles under coil-misaligned conditions. By adjusting the series and parallel compensation capacitances on the transmitting side, the output voltage can be kept constant and the energy transfer efficiency can be improved under different coil offsets. The switch-controlled capacitors (SCCs) are used to change the compensation capacitances continuously. To find the proper compensation capacitances to achieve the excellent performance of the system, the optimization algorithm is applied, and the corresponding digital control strategy is described to regulate the equivalent capacitances of SCCs. Experimental results with a 2.7 kW power scale show that the output voltage is constant, and the operating efficiency is always over 90% in the WPT system with an active resonant network under different misalignment conditions. In addition, the system is delivering an equal amount of energy for all misalignments within the range of 80 mm, which improves the expected value of transferred energy by about 29%.

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Characteristics analysis on a superconductor resonance coil WPT system according to cooling vessel materials in different distances

Cited by 7 publications

References 9 publications

A critical review on wireless charging for electric vehicles

A critical review on wireless charging for electric vehicles

Investigation of AC losses in horizontally parallel HTS tapes

Optimized Resonant Network Design for High Energy Transfer Efficiency of the WPT System

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