In the background of environment protection and power-saving awareness,the requests for new energy electric vehicles and their on-board charger(OBC) keep growing. As one of the important components in the OBC module,magnetics is getting more and more attention accordingly. The magnetics integration of differential mode(DM) and com-mon mode(CM) chokes for a 3-phase 4-wire(3P4W) electromagnetic interference(EMI) filter used in OBC is theoretically analyzed and studied. Based on the analysis and comparison of the background of power supply applications,the inte-gration principle for DM and CM chokes,and the available integration schemes in industry and academia,an integration of DM and CM chokes for 3P4W with quasi-cross DM magnetic branches is proposed. Through the magnetic flux simula-tion analysis,electrical characteristics under DC-bias and the on-board tested data,the effect of the magnetics integra-tion scheme was proved,i.e.,it can obviously decrease the DC-bias on DM magnetic branches in the case of unbalanced 3-phase current and effectively improve the anti-EMI performance of power supply.
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