Compensation Network for a 7.7 kW Wireless Charging System that Uses Standardized Coils

Grazian, F.; Shi, W.; Soeiro, Thiago B.; Dong, J.; van Duijsen, P.J.; Bauer, P.

doi:10.1109/ISCAS45731.2020.9181016

Compensation Network for a 7.7 kW Wireless Charging System that Uses Standardized Coils

Conference paper (2020)

Authors

F. Grazian DC systems, Energy conversion & Storage -

W. Shi DC systems, Energy conversion & Storage -

Thiago B. Soeiro DC systems, Energy conversion & Storage -

J. Dong DC systems, Energy conversion & Storage -

P.J. van Duijsen DC systems, Energy conversion & Storage -

P. Bauer DC systems, Energy conversion & Storage -

Research Group

DC systems, Energy conversion & Storage () (TU Delft)

DOI: https://doi.org/10.1109/ISCAS45731.2020.9181016

Inductive power transfer Wireless charging Electric vehicles (EVs) Compensation networks Standardized coils

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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

Industrial wireless charging systems use standardized coils to guarantee interoperability between different manufacturers. In combination with these coils, the compensation network can still be designed and optimized. This paper explains the step-by-step design of the compensation network for a 7.7 kW wireless charging system (power class WPT2), which is composed of standardized coils. The compensation network must satisfy the output power and voltage requirements, the soft-switching of the inverter, and the limit of voltage and current stress on the components. The S-S compensation network is found to be unfeasible for those coils, and an optimized double-sided LCC compensation network is designed. The 3-phase grid connection is selected despite the 1-phase one because it gives the lowest total conduction losses. Finally, two parallel SiC MOSFETs C3M0075120K are chosen as inverter's switch because of their low conduction losses. This solution can achieve a payback time within a year with respect to the cheapest one.

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