【摘要】 通过对影响开关电源质量的主要因素———共态噪声的产生机理进行系统分析 ,认为共态噪声是通过耦合地电容传送到输出端的 ,从而提出了相应的抑制措施 ,即在主开关管与散热片之间及变压器原、副边之间增加屏蔽层 ,或者选用快恢复二极管 (FRD)并加阻容吸收 .更多还原

【Abstract】 By analyzing systematically the production principle of the common mode noise which is the major factor affecting quality of the switch mode power supply,the decision is reached that the common mode noise is walking through coupling earth capacitance transmitting output, and then a practicable measure of restraining noise is put forward:screens are added between major switch tube and radiation, between transformer primaries and transformer script,or FRD can be selected with R C absorb network.更多还原