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Wireless power transfer (WPT) is a promising technology for charging electric vehicles (EVs) as it is convenient, and less sensitive to the environmental conditions. Usually charging coils (pads) of WPT based EV charging systems are made of Litz wire, making coils bulky and expensive with relatively high copper losses. This paper investigates the use of copper foil based pad designs for WPT systems...
An optimization method of coil structure based on vertical coupling for inductive power transfer system is proposed in this paper to achieve high coupling coefficient of loosely coupled transformer, which ensures high efficiency of system. With the help of analyzing vertical coupling, relation of different coil structures wound in clockwise or anticlockwise directions is researched. 3D finite element...
Based on magnetic induction, wireless power transfer have been proved to be promising in many applications, especially in EV charging systems. The coupling performance of loosely coupled transformers determines the overall feasibility of the whole systems. Considering volume, cost and coupling properties, a solenoid magnetic structure of 400mm∗600mm with a 200mm air gap is utilized to transfer power...
This paper reveals the common-mode (CM) noise coupling path impedance of the transformer for the whole conducted frequency range (150kHz – 30MHz) based on transmission line theory. Lumped circuit model is commonly used to describe the CM noise coupling mechanism through the transformer, but it's only valid below several mega-hertz due to the influence of distribution parasitic parameters. The transmission...
Contactless battery charging platform is an emerging technology that brings safety, reliability and convenience to low-profile charging applications. In this paper, an improved three-layer circular coil array PCB winding is proposed, which can generate the near-uniform magnetic field over a specific operation area. Moreover, an optimal circuit design procedure is developed to maintain the approximately...
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