Abstract
Based on the principle of magnetic coupled resonance theory, the problem of offset, which influences wireless power transfer system transfer characteristic is analyzed. With equivalent circuit theory, the relationship between transfer power, transfer efficiency and charge current with primary and secondary coils' mutual inductance is obtained, and then give the mathematical expression of the offset direction and the mutual inductance. Through Ansoft simulation, analyze the relationship between circular and rectangular coils' X or Y axis and diagonal offset with mutual inductance. Then use Pspice simulation analyze mutual inductance's influence on the system's transfer characteristics. Finally, based on theoretical analysis and software simulation, propose the secondary Buck converter impedance adjustment method, with PI algorithm control Buck converter's duty ratio, when the system offset occurs, the stability of wireless power transfer characteristic can be ensured.
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