Abstract: Aimed at the lack of definite guidance method for design and selection of ferrite shielding materials during the process of magnetically coupled resonant wireless power transfer and the direct influence of the addition of ferrite shielding materials on the transmission performance of the system, mathematic modelling is carried out for the foregoing power transmission based on circuit theory and Maxwell equations, a magnetically coupled resonant wireless power transfer device with ferrite shielding material is built on Maxwell simulation platform, and the influence of addition of ferrite shielding materials on the mutual inductance and coupling coefficient between coils, the resistance and quality factor of the coil itself is analyzed. Finally, a hardware circuit is built for carrying out the test and explore the influence of ferrite shielding materials with different coverage area and shape and at different distance on system transmission efficiency. The result shows that the system transmission efficiency induction can be effectively improved only under the condition of full shielding of receiving end and close leaning on the receiving coil.

Key words: wireless power transfer, ferrite shielding material, coupling coefficient, quality factor