CAJ | 학술논문

对反激式变换器的原、副边共模传导EMI噪声特点进行了分析,总结了共模传导噪声模型并详细介绍了干扰源、传输通道对共模传导噪声的影响。建模分析了变压器绕组分布电容与共模传导等效电容之间的关系,针对原、副边共模噪声的特点,提出通过调整变压器绕组层间距离来控制共模传导路径阻抗特性的新方法,实现原、副边共模电流的抵消,从而更好地抑制共模传导噪声。并以一台40W的反激式电源为实验平台,用实验方法验证了该方案的可行性。
대반격식변환기적원、부변공모전도EMI조성특점진행료분석,총결료공모전도조성모형병상세개소료간우원、전수통도대공모전도조성적영향。건모분석료변압기요조분포전용여공모전도등효전용지간적관계,침대원、부변공모조성적특점,제출통과조정변압기요조층간거리래공제공모전도로경조항특성적신방법,실현원、부변공모전류적저소,종이경호지억제공모전도조성。병이일태40W적반격식전원위실험평태,용실험방법험증료해방안적가행성。
Common-mode （CM） conducted noise characteristic of flyback converter was analyzed. A model of CM conducted noise was concluded. The influence of CM noise sources and its conduction paths on CM noise were introduced with circumstance. The relationship between the equivalent CM capacitance of transformer and the stray capacitance was analyzed detaileclly. A new solution adjusting the distance between the primary winding and the second winding to repress the CM conducted noise was proposed. The experiments carried based on a 40W flyback converter verify the validity of the new solution.