频率抖动技术在开关电源EMC设计中的应用

Application of Frequency Jitter Technique on the EMC Design for Switching Mode Power Supply

开关电源中的大电容在开关合闸瞬间产生较大的充电电流。在研究EMI测试仪器测试原理的基础上,提出频率抗干扰技术,并结合某信息类产品的开关电源测试的频谱图,分析了频率抖动技术如何减小EMI以及该技术本身可能带来的骚扰问题和解决方案。

The moment Switching Mode Power Supply switches on the large capacitor generates comparatively large charge current. Then Frequency Jitter technique was issued based on the theory of frequency jitter anti-interference and the test principle of EM! test instrument. Finally, according to the frequency spectrum diagram of a Switching Mode Power Supply on a FCR, analyzed how to minish EMI effect by Frequency Jitter technique, which also brought in new disturbance by itself.