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This paper introduces a large air-gap capacitive wireless power transfer (WPT) system for electric vehicle charging that achieves a power transfer density exceeding the state-of-the-art by more than a factor of four. This high power transfer density is achieved by operating at a high switching frequency (6.78 MHz), combined with an innovative approach to designing matching networks that enable effective...
This paper introduces a very-high-power-transfer-density GaN-based capacitive wireless power transfer (WPT) system, suitable as one module of a multi-modular WPT system for charging of electric forklifts. This capacitive WPT system achieves very high power transfer density by operating at a high switching frequency (6.78 MHz) using a GaN-based inverter, and by utilizing innovatively designed L-section...
This paper presents a methodology for multi-objective optimization of capacitive wireless power transfer (WPT) systems for electric vehicle charging that allows for a favorable tradeoff between power transfer density and efficiency. By quantifying the tradeoff between these two objectives, this multi-objective optimization approach can inform engineering decisions, given the requirements of a particular...
This paper introduces a high-performance large air-gap capacitive wireless power transfer (WPT) module as part of a multi-modular capacitive WPT system for electric vehicle charging. This WPT module utilizes two pairs of metal plates separated by an air-gap as the capacitive coupler, incorporates L-section matching networks to provide gain and reactive compensation, and is driven by a GaN-based inverter...
This paper investigates the tradeoffs involved in designing a single module in a multi-modular scalable capacitive wireless power transfer system suitable for stationary and inmotion electric vehicle charging. A matching network optimization is employed to design the module over a range of power levels, air-gap voltages, input and output voltages, and switching frequencies to evaluate impacts on its...
High-power large air-gap capacitive wireless power transfer (WPT) systems require matching networks that provide large voltage or current gain and reactive compensation. This paper introduces an analytical optimization approach for the design of L-section multistage matching networks for capacitive WPT systems. The proposed approach maximizes the matching network efficiency and identifies the optimal...
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