频率抖动技术在开关电源EMC设计中的应用

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。

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

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.