Advances in Wireless Power Transfer Systems for Roadway-Powered Electric Vehicles

Choi, Su Yeon; Gu, Beom W.; Jeong, Seog Y.; Rim, Chun T.

doi:10.1109/jestpe.2014.2343674

Cited by 579 publications

(214 citation statements)

References 74 publications

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“…With DWC, EVs are less dependent on battery systems because they receive power from the road. As a result, EVs with DWC offer several advantages over conventional EVs such as lower vehicle cost and reduced charging time due to their smaller battery systems [3][4][5]. In light of the many benefits it can provide, extensive research on WPT and DWC has been conducted at various institutions around the globe.…”

Section: Introductionmentioning

confidence: 99%

An Autonomous Coil Alignment System for the Dynamic Wireless Charging of Electric Vehicles to Minimize Lateral Misalignment

et al. 2017

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This paper proposes an autonomous coil alignment system (ACAS) for electric vehicles (EVs) with dynamic wireless charging (DWC) to mitigate the reduction in received power caused by lateral misalignment between the source and load coils. The key component of the ACAS is a novel sensor coil design, which can detect the load coil's left or right position relative to the source coil by observing the change in voltage phase. This allows the lateral misalignment to be estimated through the wireless power transfer (WPT) system alone, which is a novel tracking method for vehicular applications. Once misalignment is detected, the vehicle's lateral position is self-adjusted by an autonomous steering function. The feasibility of the overall operation of the ACAS was verified through simulation and experiments. In addition, an analysis based on experimental results was conducted, demonstrating that 26% more energy can be transferred during DWC with the ACAS, just by keeping the vehicle's load coil aligned with the source coil.

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Section: Introductionmentioning

confidence: 99%

An Autonomous Coil Alignment System for the Dynamic Wireless Charging of Electric Vehicles to Minimize Lateral Misalignment

et al. 2017

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“…Compared with traditional charging systems with power cables, WPT provides a cord-free and contactless approach. Due to the significant simplification of WPT, EVs can, therefore, be charged on the road and large batteries are no longer necessary, which will undoubtedly increase the popularity of EVs [1][2][3][4][5][6]. Attempts have been made to validate the feasibility of WPT in on-road charging for EVs.…”

Section: Introductionmentioning

confidence: 99%

Power Control Strategies of On-Road Charging for Electric Vehicles

et al. 2016

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On-road charging systems for electric vehicles (EVs) have shown revolutionary potential in extending driving range and reducing battery capacities. The optimal equivalent load resistances to maximize receiving power of each EV according to different EV amounts are investigated. This paper introduces a typical on-road charging system with a single transmitting coil and multiple receiving coils. The equivalent circuit models according to different numbers of EVs are built. Power control strategies with regard to a varying number of EVs are then presented. Specifically, self-adaptive source voltage based on primary current detection is utilized to charge EVs, while the source can support enough EVs by providing the rated power. Otherwise, the source voltage is regulated to its maximum value and the charging energy of each EV is suggested to be controlled by adjusting the individual driving speed. A remarkable feature of the power control strategies is that the charging power for each EV is stable and can compensate for energy losses efficiently. As for urgent power demand from a particular EV with a low battery capacity, the adjustment of the corresponding load resistance is applied to alter the power distribution. The proposed technique has been verified in an experimental prototype.

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“…Researches with respect to this field focus on the design of the high frequency inverter [3], [4], the optimization design of the resonators [3], [5] and the system structures [6]. In order to resolve existing problems such as the low energy density of the battery, frequent charging and high cost due to a heavy battery, on-road charging for EVs has been proposed [7]- [9]. If EVs can be powered while driving, battery capacity can be reduced quite a lot.…”

Section: Introductionmentioning

confidence: 99%

“…If EVs can be powered while driving, battery capacity can be reduced quite a lot. Studies of on-road charging for EVs are reviewed in [7]. The schemes of the power supply are divided into two categories by considering the structures of the transmitting rail.…”

Section: Introductionmentioning

confidence: 99%

A Topological Transformation and Hierarchical Compensation Capacitor Control in Segmented On-road Charging System for Electrical Vehicles

Han¹,

Tan²,

Huang³

et al. 2016

Journal of Power Electronics

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Experiencing power declines when the secondary coil is at the middle position between two primary coils is a serious problem in segmented on-road charging systems with a single energized segmented primary coil. In this paper, the topological transformation of a primary circuit and a hierarchical compensation capacitor control are proposed. Firstly, the corresponding compensation capacitors and receiving powers of different primary structures are deduced under the condition of a fixed frequency. Then the receiving power characteristics as a function of the position variations in systems with a single energized segmented primary coil and those with double segmented primary coils are analyzed comparatively. A topological transformation of the primary circuit and hierarchical compensation capacitor control are further introduced to solve the foregoing problem. Finally, an experimental prototype with the proposed topological transformation and hierarchical compensation capacitor control is carried out. Measured results show that the receiving power is a lot more stable in the movement of the secondary coil. It is a remarkable fact that the receiving power rises from 10.8W to 19.2W at the middle position between the two primary coils. The experimental are in agreement with the theoretical analysis.

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Advances in Wireless Power Transfer Systems for Roadway-Powered Electric Vehicles

Cited by 579 publications

References 74 publications

An Autonomous Coil Alignment System for the Dynamic Wireless Charging of Electric Vehicles to Minimize Lateral Misalignment

An Autonomous Coil Alignment System for the Dynamic Wireless Charging of Electric Vehicles to Minimize Lateral Misalignment

Power Control Strategies of On-Road Charging for Electric Vehicles

A Topological Transformation and Hierarchical Compensation Capacitor Control in Segmented On-road Charging System for Electrical Vehicles

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