Optimal design and analysis of wireless power transfer system coupled with power source

In 2006, the MIT (Massachusetts Institute of Technology) research team reports their experiment on lighting up a 60-W bulb with two 60-cm diameter coils which are separated by a distance of 2 m. The wireless power transfer technology has, since then, received a surge of interests from all over the world and has now been applied to many areas such as household appliances, RFID (radio frequency identification devices), medical implanted devices, electric vehicles and maglev trains. Wireless power transfer technology has many applications by virtue of its intrinsic safety and convenience characteristics . This is particularly so when the wireless power transfer systems are used in conjunction with medical implanted devices, as they can greatly reduce the pain of patients and their financial burdens . In previous researches, the optimal system mainly focuses on the design of the coils which include the transmitter coil and the receiver coil . In this paper, the wireless power transfer system will be optimized to include also the power source circuit and load circuit, in addition to the coils, as an integral system . A simple circuit which converts the DC source into AC excitation as the feeding circuit is included in the wireless power transfer system . The parameters in this circuit are considered along with the coil parameters in the optimization study .