Design Of Contactless Charging Platform For Cellphone

As a new way to transfer energy, contactless power transfer has received much attention recently. The charging platform application for the consumer electric equipments such as cellphone attracts many research institutes and companies. It can get rid of the restriction of the traditional cables and has a promising prospect.The contactless charging platform for cellphone is studied in this paper. Analyses of the topologies of high frequency inverter and resonant converter are presented first. Then the compensation topologies of the loosely coupled transformer are discussed in detail. Modeling and analysis of the contactless charging platform for cellphone with one load or multi-loads are described, including the linear load condition and the rectifying bridge load condition. Taking the linear load condition as an example, influences to the voltage gain are discussed when the parameters of the system vary respectively. A design methodology based on the voltage gain is described and verified by the experimental results.As an important component of the contactless charging platform for cellphone, the primary structure of the loosely coupled transformer is concerned with the magnetic-field distribution above the charging platform. The structure and the magnetic-field distribution of the loosely coupled transformer are studied. A practical charging platform is built, simulated, and the theory is verified by the experimental results.