基于補償原理的正激式變換器傳導共模EMI抑制

摘要：本文分析了開關電源共模EMI產生原因及傳播方式,介紹了傳統共模EMI抑制方法的特點，并且針對正激式變換器分析了共模EMI傳播模型，提出了利用補償原理抑制正激式變換器共模EMI的方法。 敘詞：正激式變換器 無源補償 共模EMI抑制 寄生電容 Abstract：The generant reason and transimission method of CM EMI in switch power supply is analyzed in this paper. The method of suppress the traditional CM EMI is introduced . Aiming at the forward converter ,this paper analyzes the model that the CM EMI generate. A solution which uses passive compensation is proposed to suppress the CM EMI in the forward converter. Keyword：Forward converter, Passive Compensation, CM EMI Suppression, Stray capacitance