Switching power supply has some advantages of small volume, light weight, high efficiency and so on, and wide application in digital circuits, however, its high-frequency on and off could change voltage and current, which would produce a large number of electromagnetic interference, affect the normal operation of electronic equipment. This paper mainly introduces the interference and control measures of power line, peak voltage and current.%开关电源具有体积小、重量轻、效率高等优点,在数字电路中应用广泛,但其高频开关会引起电压及电流的变化,这些变化会产生大量电磁干扰,影响电子设备正常运行.本文主要介绍了电源线干扰及抑制、尖峰电压及电流对开关电源的干扰及抑制措施.
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