Research On Resonant Power Transfer Characteristics And Design Of Wireless Charging System

Wireless power transfer is arousing attention from researchers since it is first proposed by Tesla.Recently,wireless charging has already been applied in some household appliances like electric toothbrush and extended to fields including smart phones,biological medicine,and electric vehicles,etc.However,for specific requirement,theoretical investigation still lacks integrity.Thus,the research on wireless power transfer characteristics,especially the multi-receiver systems,remains significant for the application of wireless charging technology.Additionally,the establish of the prototype for high power applications like electric vehicles is the first essential step of the most scientific research teams and valuable for further optimisation.Through the coupled mode theory,the power transfer characteristics and the effects of aluminium obstacles on electromagnetic distribution are demonstrated for the application of phones with aluminium alloy shells.Based on equivalent circuit theory,this paper analysis the transmission power and efficiency of dual-receiver systems,investigates the voltage transfer ratio and frequency offsets features and proposes two optimal methods to shift the working point.The 2.5 kW wireless power transfer platform prototype for electric vehicles is set up and meets the requirement of the SAE standard.Finally,the major work is summarized and further work is presented.