Abstract: In order to meet the shielding requirement of broadband electric field radiation, a circuit model of shielding effectiveness analysis for wireless power transmission system with active shielding is established. It is derived that the active shielding excitation source can be controlled by the voltage excitation source of wireless power transmission system. The formulas for calculating the shielding effectiveness of space point position and surface position are given. The analysis of the broadband shielding effectiveness can be realized by extracting the voltage components of the concerned frequency bands after Fourier transform of the excitation voltage source. The effectiveness of the method is proved by simulation analysis. The shielding effectiveness is related to the spatial location and limited by the transmission efficiency. By adjusting the voltage control coefficient of the voltage controlled voltage source, the effective shielding of the electric field radiation at the position can be realized under the condition of relatively small transmission efficiency loss. Finally, the correctness and engineering applicability of the analysis method of active shielding effectiveness of wireless power transmission system are verified by an experiment.

Key words: Satellite, Electromagnetic compatibility, Wireless power transmission, Electric field radiation, Shielding effectiveness