Title :
Optimal Design of a Hybrid Winding Structure for Planar Contactless Battery Charging Platform
Author :
Xun Liu ; Hui, S.Y.
Author_Institution :
ConvenientPower, Ltd., Hong Kong
Abstract :
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 electromagnetic compatibility 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 multiload applications. A design procedure is proposed and verified by the experiments. An efficiency of about 80% has been achieved for the coupled structures when four loads are charged on the platform simultaneously.
Keywords :
battery chargers; coils; electromagnetic compatibility; inductive power transmission; network synthesis; windings; circuit analysis; circuit modeling; coil; contactless battery charger; electromagnetic compatibility scanner; hybrid winding structure; inductive power transmaission; inverter circuit topology; planar contactless battery charging platform; portable consumer electronic products; resonant compensation tank; spiral winding; uniform magnetic field distribution; Batteries; Coils; Consumer electronics; Energy measurement; Magnetic analysis; Magnetic field measurement; Protocols; Prototypes; Spirals; Surface charging; Coreless transformer; multiload application; planar contactless battery charger;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2007.911844