開關電源中開關管及二極管 EMI抑制方法分析研究

摘要：隨著電子技術的不斷進步,開關電源向高頻化、高效化方向迅猛發展，EMI抑制已成為開關電源設計的重要指標。本文結合開關電源中開關管及二極管EMI產生機理，列舉出：并接吸收電路、串接可飽和磁芯線圈、傳統準諧振技術、LLC串聯諧振技術四種抑制EMI的方法，并對其抑制效果進行比較分析。 敘詞：EMI RC、RCD電路 磁芯線圈 準諧振 LLC諧振 Abstract：With the progress of electronic technology , the switch power supply turns to high frequency and high efficiency development,so restraint of EMI has become the important index in the design of the switch power supply.Base on the principle of EMI which is generated by switch and diode, this paper offers four kinds of methods which can restrain it.The first, parallel connection absorbing circuitthe second, in series with saturated magnetic loopsthe third, tradition resonance technologythe forth, LLC resonance technology. Keyword：EMI RCRCD Circuit Saturated magnetic loops Tradition resonance technology LLC Resonance technology