Small-size light-weight transformer with new core structure for contactless electric vehicle power transfer system

Chigira, Masato; Nagatsuka, Yuichi; Kaneko, Yasuyoshi; Abe, Shigeru; Yasuda, Toru; Suzuki, Akira

doi:10.1109/ecce.2011.6063778

Cited by 106 publications

(56 citation statements)

References 6 publications

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“…The IPT system for EV charging requires maximum alignment between the coils to avoid inefficient power transfer due to driver mistake while parking the vehicle at the desired position [28]. The car weight may slightly change the air gap between the EV chassis and the ground, and, thereby, coupling; consequently, it would affect the power transfer efficiency [29]. The IPT charging system with perfect alignment will reduce the leakage flux, and, as a result, it reduces the electromagnetic interference emission from the system; however, an IPT system that could offer good tolerance for misalignment to give maximum freedom to the driver, is desirable [16].…”

Section: Misalignment Tolerance Analysismentioning

confidence: 99%

Coil Design for High Misalignment Tolerant Inductive Power Transfer System for EV Charging

et al. 2016

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Abstract:The inductive power transfer (IPT) system for electric vehicle (EV) charging has acquired more research interest in its different facets. However, the misalignment tolerance between the charging coil (installed in the ground) and pick-up coil (mounted on the car chassis), has been a challenge and fundamental interest in the future market of EVs. This paper proposes a new coil design QDQ (Quad D Quadrature) that maintains the high coupling coefficient and efficient power transfer during reasonable misalignment. The QDQ design makes the use of four adjacent circular coils and one square coil, for both charging and pick-up side, to capture the maximum flux at any position. The coil design has been modeled in JMAG software for calculation of inductive parameters using the finite element method (FEM), and its hardware has been tested experimentally at various misaligned positions. The QDQ coils are shown to be capable of achieving good coupling coefficient and high efficiency of the system until the misalignment displacement reaches 50% of the employed coil size.

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Section: Misalignment Tolerance Analysismentioning

confidence: 99%

Coil Design for High Misalignment Tolerant Inductive Power Transfer System for EV Charging

et al. 2016

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“…Saitama University has partnered with Technova, Inc. and Aisin AW Co. Ltd., in Japan, to produce a device that has a double-sided winding wrapped around the centers of novel H-shaped cores [52]. Compared to a rectangular core, the H-shaped ferrite core decreases the weight of the transformer, reduces copper losses due to shorter windings, and enhances tolerance to lateral misalignment due to the increased length of the magnetic poles in the lateral direction.…”

Section: V E V W C R E S E a R C H S T U D I E Smentioning

confidence: 99%

Electric vehicle wireless charging technology: a state-of-the-art review of magnetic coupling systems

Fisher

Farley

Gao

et al. 2014

wpt

114

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“…According to [63] and [64], the double-sided windings with rectangular core shape, as shown in Fig. 19, have also have been considered for EV charging systems.…”

Section: Charging Distancementioning

confidence: 99%

“…The ICPT system for EV charging requires maximum alignment between the coils to avoid inefficient power transfer due to driver mistake while parking the vehicle in the desired position [62]. The car weight may slightly change the air gap between the EV chassis and the ground and thereby coupling, consequently it would affect the power transfer efficiency [64]. The ICPT charging system with perfect alignment will reduce the leakage flux, and, as a result, it reduces the electromagnetic interference emission from the system; however, an ICPT system that could offer good tolerance for misalignment to give maximum freedom to the driver, is desirable [31].…”

Section: Misalignment Tolerationmentioning

confidence: 99%

“…21, they still have good coupling because the flux linkage path is extended compared to the circular coils, as shown in Fig. 20 [64]. The ICPT systems can have a variable coupling coefficient, thus a perfect frequency control that keeps the ICPT circuit to remain in the state of resonance or coil geometry optimization that can offer high efficiency with a reasonable misalignment between coils may be employed, however, the system becomes either complex in terms of frequency control or costly due to the geometry of the coils [62,71].…”

Section: Misalignment Tolerationmentioning

confidence: 99%

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Inductively coupled power transfer (ICPT) for electric vehicle charging – A review

Kalwar

Aamir

Mekhilef

2015

Renewable and Sustainable Energy Reviews

166

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a b s t r a c tThe deficiency in the availability of petroleum products has given rise to the incorporation of electric vehicles (EVs) globally as a substitute for the conventional transportation system. Significant research has been pursued over last two decades in the development of efficient EV charging methods. A preliminary review of few methods developed for wireless charging revealed that ICPT is a promising and convenient method for the wireless charging of EVs. This paper includes the equivalent circuit analysis and characteristics of the ICPT system and focuses on the research progress in respect of the designs for the charging coil, leakage inductance compensation topologies, power level enhancement and misalignment toleration. The improvement in these factors has been essential for the implementation of EV charging. A brief discussion over design process and control of ICPT system has been added. Conclusions have been made on the basis of the information extracted from the literature and some future recommendations are provided.

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Small-size light-weight transformer with new core structure for contactless electric vehicle power transfer system

Cited by 106 publications

References 6 publications

Coil Design for High Misalignment Tolerant Inductive Power Transfer System for EV Charging

Coil Design for High Misalignment Tolerant Inductive Power Transfer System for EV Charging

Electric vehicle wireless charging technology: a state-of-the-art review of magnetic coupling systems

Inductively coupled power transfer (ICPT) for electric vehicle charging – A review

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