A Witricity-Based High-Power Device for Wireless Charging of Electric Vehicles

Dai, Zhongyu; Wang, Junhua; Long, Mengjiao; Huang, Hong

doi:10.3390/en10030323

Cited by 31 publications

(9 citation statements)

References 18 publications

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“…It is well known that in the inductance-capacitance (LC) series resonance circuit, the voltage values on L and C are identical, while the phases are opposite [114]. The LC-S topology loss is approximately the same as in the LCL, but in this case there will be fewer elements.…”

Section: A Modification and Combination Of Classics Compensations Tomentioning

confidence: 99%

Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

et al. 2019

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Wireless power transfer devices are becoming more relevant and widespread. Therefore, an article is devoted to a review, analysis and comparison of compensation topologies for an inductive power transfer. A new classification of topologies is developed. A lot of attention is paid to the problems of the physical fundamentals of compensation work, standards, safety, and five main topology requirements. It is determined, that topologies with the series primary compensating are the most effective in the IPT for charging devices among the four classical schemes. The series-parallel solution is recommended in case of the low output voltage, minimum size of a secondary side coil is achievable. The series-series solution does not depend on the magnetic coupling coefficient and the load on the resonance frequency. For the convenience of displaying and understanding the information, the comparison results are listed in the tables, graphs and dependencies. The main suitable topologies for a certain application are defined. The given conclusions provide a ''one-stop'' information source and a selection guide on the application of compensation topologies both in terms of devices and in terms of power level that is the main value of this paper. During literature analysis and recent trends in the market for wireless power transmission devices, the main possible further ways of developing topologies are underlined. First of all, it concerns increasing the frequency of resonance of compensation topologies, the use of multilevel / multi-pulse / multicoils structures, the study of existing high-frequency semiconductors and the development of the semiconductor and magnetic materials.

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Section: A Modification and Combination Of Classics Compensations Tomentioning

confidence: 99%

Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

et al. 2019

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“…WiTricity, an American high-tech company, has produced a wireless energy transfer system based on alternating magnetic resonance [39]. The system (Figure 3b) has an adjustable output power interval, with a wide range from 3.6 to 11 kW, so that it can satisfy the charging needs of PHEVs equipped with small and short-range battery packs to EVs equipped with large ones [40].…”

Section: Witricitymentioning

confidence: 99%

Trends and Emerging Technologies for the Development of Electric Vehicles

Liu

Lau

et al. 2022

Energies

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In response to severe environmental and energy crises, the world is increasingly focusing on electric vehicles (EVs) and related emerging technologies. Emerging technologies for EVs have great potential to accelerate the development of smart and sustainable transportation and help build future smart cities. This paper reviews new trends and emerging EV technologies, including wireless charging, smart power distribution, vehicle-to-home (V2H) and vehicle-to-grid (V2G) systems, connected vehicles, and autonomous driving. The opportunities, challenges, and prospects for emerging EV technologies are systematically discussed. The successful commercialization development cases of emerging EV technologies worldwide are provided. This review serves as a reference and guide for future technological development and commercialization of EVs and offers perspectives and recommendations on future smart transportation.

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“…The WPT system requires capacitors to compensate for the transmit and receive coils, respectively, to operate at the same frequency point. At present, there are four classic compensation structures: S-S, S-P, P-S, and P-P [20]. This paper chooses the S-S structure and its equivalent circuit is shown in Fig.…”

Section: B Efficiency Constraintsmentioning

confidence: 99%

Coaxial Nested Couplers-Based Offset-Tolerance Rotary Wireless Power Transfer Systems for Electric Excitation Motors

Wang

Nie

et al. 2020

IEEE Access

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In order to improve poor anti-offset capability of rotary transformer in electric excitation motor, a coaxial nested rotary wireless power transfer (CNR-WPT) system has been proposed in this paper. Firstly, considering the spatial geometric relationship of the coils and the power transmission efficiency of the CNR-WPT, the preliminary coil structure has been proposed. Secondly, through theoretical derivation, the specific relationship between the mutual inductance of the coils and the offset have been studied to verify the feasibility of the preliminary design. Thirdly, aiming at the problem that the CNR-WPT is susceptible to steel interference, the magnetic field has been optimized by adding ferrite and introducing a protective casing in this paper. Finally, an experimental platform for CNR-WPT system has been built. The experimental results verify that the power transmission efficiency of the CNR-WPT system can reach 90% when the radial offset and axial offset are below 5 mm, and the angular offset is below 5 •. The energy losses can be reduced by adding ferrite and protecting the casing. The CNR-WPT system thereof can also be applied to other rotary power transmission occasions. INDEX TERMS Electric excitation motor, coaxial nested rotary wireless power transfer system, anti-offset capability, power transmission efficiency.

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A Witricity-Based High-Power Device for Wireless Charging of Electric Vehicles

Cited by 31 publications

References 18 publications

Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

Trends and Emerging Technologies for the Development of Electric Vehicles

Coaxial Nested Couplers-Based Offset-Tolerance Rotary Wireless Power Transfer Systems for Electric Excitation Motors

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