Prediction of the Conducted Interference in the Isolated AC-Supply System

With the development of the power electronics,the EMI generated by the power electronics become more and more serious,especially in ship.The EMI must be predicted first to reduce the interference.However,present method all have disadvantages for these isolated power supply system.Based on the operating principle of the three-phase rectifier,the calculation equations of different mode EMI are obtained in the frequency-domain.Using these equations,the EMI generated by multiple rectifiers can also be calculated easily.At last,the calculated results are verified by the experiment results.Compared with the simulation,the proposed method is less time consuming and can be easily used for predicting the EMI in isolated power supply system.