Multi-modular capacitive wireless power transfer circuit and related techniques

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United States of America Patent

PATENT NO 11502542
APP PUB NO 20200373783A1
SERIAL NO

16636211

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A high performance kilowatt-scale large air-gap multi-modular capacitive wireless power transfer (WPT) system is provided for electric vehicle (EV) charging. In one particular implementation, the multi-modular system achieves high power transfer while maintaining fringing electric fields within prescribed safety limits. The fringing fields are reduced using near-field phased-array field-focusing techniques, wherein the adjacent modules of the multi-modular system are out-phased with respect to one another. The inter-module interactions in this multi-modular system can be modeled, and an approach to eliminate these interactions in a practical EV charging environment is provided. To illustrate one example implementation, a prototype 1.2-kW 6.78-MHz 12-cm air-gap multi-modular capacitive WPT system comprising two 600-W modules is provided. This prototype system achieves 21.2 kW/m2 power transfer density and a peak efficiency of 89.8%. This multi-modular system also achieves a fringing field reduction of 50% compared to its individual modules.

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Patent OwnerAddress
THE REGENTS OF THE UNIVERSITY OF COLORADO A BODY CORPORATE1890 N REVERE CT SUITE 6202 AURORA CO 80045

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Afridi, Khurram K Boulder, US 23 458
Kumar, Ashish Boulder, US 181 1076
Popovic, Zoya Boulder, US 4 443
Regensburger, Brandon Boulder, US 5 8
Sinha, Sreyam Boulder, US 9 15

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