Optimal Design of a Hybrid Winding Structure for Planar Contactless Battery Charging Platform

Planar contactless battery charging platform is an emerging technology that has the potential of unifying the charging protocols of portable consumer electronic products. In this paper, a new hybrid structure which consists of a coil and a spiral winding is proposed for improving the uniform magnetic field distribution over the charging surface. An analysis into an optimal design of the number of turns and the dimension of the spiral winding is presented for a given concentrated coil. The uniform magnetic field distribution of the designed prototype is measured by an EMC scanner and by an energy-receiving coil. Based on circuit modeling and analysis, the inverter circuit topology and particularly the resonant compensation tank is designed for maximizing power transfer for multi-load applications. A design procedure is proposed and verified by the experiments. An efficiency of about 80% has been achieved for the coupling structure itself when four loads are charged on the platform simultaneously

[1]  Grant A. Covic,et al.  Design of loosely coupled inductive power transfer systems , 2000, PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409).

[2]  Henry Shu-Hung Chung,et al.  Optimal operation of coreless PCB transformer-isolated gate drive circuits with wide switching frequency range , 1999 .

[3]  Junji Hirai,et al.  Study on intelligent battery charging using inductive transmission of power and information , 2000 .

[4]  Henry Shu-Hung Chung,et al.  Coreless printed circuit board (PCB) transformers for power MOSFET/IGBT gate drive circuits , 1999 .

[5]  Jacobus Daniel van Wyk,et al.  Sliding transformers for linear contactless power delivery , 1997, IEEE Trans. Ind. Electron..

[6]  Milan M. Jovanovic,et al.  A contactless electrical energy transmission system for portable-telephone battery chargers , 2003, IEEE Trans. Ind. Electron..

[7]  Y. Mitamura,et al.  Development of an implantable motor-driven assist pump system , 1990, IEEE Transactions on Biomedical Engineering.

[8]  Seungwon Choi,et al.  Design and implementation of low-profile contactless battery charger using planar printed circuit board windings as energy transfer device , 2004, IEEE Trans. Ind. Electron..

[9]  Bo-Hyung Cho,et al.  Design of a contactless battery charger for cellular phone , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[10]  J. Maxwell.  A Treatise on Electricity and Magnetism , 1873, Nature.

[11]  Henry Shu-Hung Chung,et al.  Coreless planar printed-circuit-board (PCB) transformers-a fundamental concept for signal and energy transfer , 2000 .

[12]  H. Greenhouse,et al.  Design of Planar Rectangular Microelectronic Inductors , 1974 .

[13]  W. G. Hurley,et al.  Calculation of self and mutual impedances in planar magnetic structures , 1995 .

[14]  Grant Covic,et al.  Power transfer capability and bifurcation phenomena of loosely coupled inductive power transfer systems , 2004, IEEE Transactions on Industrial Electronics.

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

[16]  Bo-Hyung Cho,et al.  An energy transmission system for an artificial heart using leakage inductance compensation of transcutaneous transformer , 1996 .

[17]  Henry Shu-Hung Chung,et al.  Some electromagnetic aspects of coreless PCB transformers , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[18]  S.Y.R. Hui,et al.  Finite element simulation of a universal contactless battery charging platform , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[19]  Xun Liu,et al.  Equivalent Circuit Modeling of a Multilayer Planar Winding Array Structure for Use in a Universal Contactless Battery Charging Platform , 2005, IEEE Transactions on Power Electronics.