开关电源电路纹波的抑制方法

Rejection of Ripple in Switching Power Supply Circuit

降低开关电源电路输出电压的纹波,是保证电压稳定和系统正常工作的基础。本文分析开关电源电路中纹波的产生和危害,结合实际应用的开关电源BUCK电路结构,详细阐述通过改善PCB布板从而降低纹波的方法,并通过改善前后纹波电压的测量,验证方法的正确性。

Reducing the ripple of the output voltage of switching power supply circuit is the basis of ensuring voltage stability and normal operation of the system.This paper analyses the generation and harm of ripple in switching power supply circuit.Combining with the practical application of BUCK circuit structure of switching power supply,the method of reducing ripple by improving PCB layout is elaborated in detail.The correctness of the method is verified by improving the measurement of ripple voltage before and after.