An optimization method of coil parameters for wireless charging system of electric vehicle

摘要

In order to reduce the cost and dimension of the EV's wireless power transfer coil, an efficient optimization method is presented. Based on the mutual inductance coupling theory, the analytic function of power transfer efficiency is derived. The key parameters in this function are simplified by the measures of Fourier series and linearization. With these key parameters, the expression of the power transfer efficiency is vastly predigested and the impact of the turns of coils is easily analyzed. With special examples, the turns of coil obtained from this method are verified. The experimental result shows that the efficiency is even more than 90% using the coil which dimension is 0.6 time of that of primary coil, which shows the coil optimization method is simple and valid.