Mid‐Range IPT by Dipole Coils

The 5 m off???distance inductive power transfer systems that have optimally shaped cores in the primary and secondary coils are explained. Instead of conventional loop???type coils for a magnetic resonance scheme, magnetic dipole???type coils with cores are used for a drastic reduction in deployment space and quite long wireless power transfer. An optimized stepped core structure is also proposed, where a strong magnetic field section is so thick that magnetic field density may be even. Thus, the proposed optimized stepped core has only a 41% core loss compared with an unoptimized even core but delivers 2.1 times more wireless power for a given amount of core. Experimentally obtained maximum output powers and primary???coil???to???load???power efficiencies for 3 m, 4 m, and 5 m at 20 kHz were 1403 W, 471 W, and 209 W and 29%, 16%, and 8%, respectively. This chapter is based on two papers by The 5 m off???distance inductive power transfer systems that have optimally shaped cores in the primary and secondary coils are explained. Instead of conventional loop???type coils for a magnetic resonance scheme, magnetic dipole???type coils with cores are used for a drastic reduction in deployment space and quite long wireless power transfer. An optimized stepped core structure is also proposed, where a strong magnetic field section is so thick that magnetic field density may be even. Thus, the proposed optimized stepped core has only a 41% core loss compared with an unoptimized even core but delivers 2.1 times more wireless power for a given amount of core. Experimentally obtained maximum output powers and primary???coil???to???load???power efficiencies for 3 m, 4 m, and 5 m at 20 kHz were 1403 W, 471 W, and 209 W and 29%, 16%, and 8%, respectively.This chapter is based on two papers, one by C.B. Park, S.W. Lee, and C.T. Rim, ???5 m???off???long???distance inductive power transf er system using optimum shaped dipole coils,??? ECCE???ASIA, June 2012, pp. 1137???1142 and the other by C. Park, S. Lee, G.H. Cho, and C.T. Rim, ???Innovative 5m???off???distance inductive power transfer systems with optimum shaped dipole coils,??? IEEE Trans. on Power Electronics, vol. 30, no. 2, pp. 817???827, February 2015.

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