aiming at the feature of cm interference in power converters, a new approach ? intrinsic dynamic nodes potential balance is proposed . by building node pair with balance potential and making use of the intrinsic stray capacitor of power semiconductor devices, the cm current can be suppressed effectively 在对共模干扰建模的基础上,提出了内在动态节点电位平衡的思想,其思路是通过在电路内部构造动态电位平衡节点对,并利用电路中功率器件固有的对地分布电容使得电路中的共模干扰电流互相抵消,从而抑制功率变换器的共模emi。