1.Instrumental &2.Electrical Engineering Department Xiamen University
Project Supported byGeneral program of National Natural Science Foundation of China
In order to avoid the risk of spark between the civil aircraft and other equipment, and improve the convenience of charging, this paper uses wireless power transfer to supply power for it. In the wireless charging system of constant voltage and current, the compensation network branch current not only determines the cost of power devices, but also relates to the system loss. Therefore, the optimization of compensation network current is an important way to improve efficiency of system. In this paper, the loop current of low-order network is analyzed, and the condition for achieving minimum current is given. And the general method of optimal compensation network current is obtained. Then, on the basis of analyzing completely symmetrical compensation network which can realize constant voltage or constant current, this paper deduces a series of topologies. Next, combined with loop current optimization conditions, the parameters of the constant voltage and constant current topology are designed. At the same time, the charging mode change is achieved by using the primary side current detection method. Finally, the current optimization method and the load independent implementation method are verified by simulation and experiment. The results show that the proposed topology has good performance of constant current and constant voltage output. And the current optimization method can greatly reduce the circuit current stress, and improve the system efficiency.