A new IPT magnetic coupler for electric vehicle charging systems

Inductive Power Transfer (IPT) is a practical method for recharging Electric Vehicles (EVs) because is it safe, efficient and convenient. Couplers or Power Pads are the power transmitters and receivers used with such contactless charging systems. Due to improvements in power electronic components, the performance and efficiency of an IPT system is largely determined by the coupling or flux linkage between these pads. Conventional couplers are based on circular pad designs and due to their geometry have fundamentally limited magnetic flux above the pad. This results in poor coupling at any realistic spacing between the ground pad and the vehicle pickup mounted on the chassis. Performance, when added to the high tolerance to misalignment required for a practical EV charging system, necessarily results in circular pads that are large, heavy and expensive. A new pad topology termed a flux pipe is proposed in this paper that overcomes difficulties associated with conventional circular pads. Due to the magnetic structure, the topology has a significantly improved flux path making more efficient and compact IPT charging systems possible.

[1]  Grant A. Covic,et al.  Design and optimisation of magnetic structures for lumped Inductive Power Transfer systems , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[2]  Andrew D. Brown,et al.  A contactless electrical energy transmission system , 1999, IEEE Trans. Ind. Electron..

[3]  Andreas Sumper,et al.  Electrical vehicles: State of art and issues for their connection to the network , 2009, 2009 10th International Conference on Electrical Power Quality and Utilisation.

[4]  John G. Hayes,et al.  An ultra-compact transformer for a 100 W to 120 kW inductive coupler for electric vehicle battery charging , 1996, Proceedings of Applied Power Electronics Conference. APEC '96.

[5]  K. Harada,et al.  Large air-gap coupler for inductive charger [for electric vehicles] , 1999 .

[6]  Hiroshi Sakamoto,et al.  Ferrite core couplers for inductive chargers , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).

[7]  Aaron Brooker,et al.  Technology Improvement Pathways to Cost-effective Vehicle Electrification , 2010 .

[8]  Grant A. Covic,et al.  The design of a contact-less energy transfer system for a people mover system , 2000, PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409).

[9]  S.Y.R. Hui,et al.  A new generation of universal contactless Battery Charging platform for portable Consumer Electronic equipment , 2004, IEEE Transactions on Power Electronics.

[10]  Xun Liu,et al.  Simulation Study and Experimental Verification of a Universal Contactless Battery Charging Platform With Localized Charging Features , 2007, IEEE Transactions on Power Electronics.

[11]  Joung-Hu Park,et al.  Design of a contactless battery charger for cellular phone , 2001, IEEE Trans. Ind. Electron..

[12]  J.-P. Ferrieux,et al.  A multi-resonant converter for non-contact charging with electromagnetic coupling , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[13]  Grant A. Covic,et al.  Practical considerations for designing IPT system for EV battery charging , 2009, 2009 IEEE Vehicle Power and Propulsion Conference.

[14]  John T. Boys,et al.  Stability and control of inductively coupled power transfer systems , 2000 .

[15]  N. H. Kutkut,et al.  Design considerations for power converters supplying the SAE J-1773 electric vehicle inductive coupler , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.