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Air-core inductive charging systems offer significant weight, cost and reliability advantages over competing ferrite based solutions at the expense of reduced coupling factor. Acceptable magnetic link efficiencies (>95%) can nonetheless be achieved by operating at MHz frequencies where the coil Q is inherently very high (>1000). We present a design approach for transmit-side power electronics...
In this paper, we propose a concise unit-cell design of magnetic metamaterial. The effective permeability of the unit cell is derived by S parameter method and can be flexibly adjusted to meet specific requirements. 6×6 planar metamaterial slabs are constructed by the proposed unit cells to verify their effects in a 6.78MHz wireless power transfer system. The effects of 1-slab and 2-slab metamaterials...
This paper presents an active-clamp flyback microinverter for grid connected photovoltaic (PV) ac module system. The active-clamp circuit achieves the soft switching by allowing a negative current that discharges the output capacitor of the primary switch and zero voltage switching (ZVS) turn on is achieved. The active-clamp switch is also operated in ZVS. Therefore the switching losses of the high...
Commercial high power Electric Vehicle (EV) Inductive Power Transfer (IPT) systems need to comply with leakage regulations while transferring the required power. The choice and design of the magnetic coupler (pad) topology heavily influences the power, efficiency and leakage of these systems. This paper seeks to highlight the advantages and disadvantages of two pad topologies, the Square Pad and the...
A dynamic wireless power transfer (WPT) system for electric vehicles has to simplify its road-side facilities, which are installed over long distances. Although previous research has proposed secondary-side efficiency control, design constraints of the WPT system have to be imposed to obtain the reference value of the control. In this paper, an efficiency maximization method based on simultaneous...
Shaping of the magnetic field between the primary and secondary coils of Inductive Power Transfer Systems is crucial for system performance and to keep leakage within emissions guidelines. This paper gives an overview of different methods used to shape the magnetic field, followed by work done by the authors looking into one of these methods for use in an electric vehicle charging application using...
Bi-directional inductive power transfer (BD-IPT) systems are becoming popular as a technology suitable for implementing vehicle-to-grid (V2G) systems due mainly to convenience, simplicity and safety offered by this technology. Although a number of grid integration technologies suitable for BD-IPT systems have been proposed in the past, a comparison between these technologies is yet to be presented...
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