Design and Analysis Study of Magnetic Leakage Prevention Based on DD Coil

DD coil coupler is widely used in wireless power transfer system, which can improve the magnetic field in the middle of coupler. However, the edge leakage of the DD coil is always happened. This paper investigates the design of DD coils which are based on the antielectromagnetic leakage effect and analyzes the traditional DD coil model. Two solution methods are proposed for the electromagnetic leakage problem: change the edge turn-to-turn moments of the DD coil and add excited coils on both sides of the DD coil. By comparing these two design methods, the excited coils model has the best effect to solve the electromagnetic leakage problem.