论文部分内容阅读
由于开关电源具有小型、轻量、效率高、价格低等优点,在工业上有取代线性电源的趋势。然而,开关电源的这些优点在一定程度上被它们产生的电磁干扰所抵消。由于开关电源的广泛应用,人们关心的是如何限制这一电磁干扰。例如最近通过的美国联帮通讯委员会(FCC)规定就是企图限制开关电源产生的电磁干扰。这个章程在美国商业市场上虽然是一个相当新的规定,但在欧洲对最大允许的电磁干扰的限制已经有一些时候了。欧洲对电磁干扰要求最严格的机构是西德的德国电工学会(VDE)。还有一个有关干扰的规定是美国军用产品电磁干扰抑制标准(MIL)。 FCC和VDE所规定的电磁干扰范围有明显的区别,主要区别是由于两个机构的不同目的所产生的。理解这些规定和它们的目的对于分析开关电源的电磁干扰的特性是很重要的。
As the switching power supply has the advantages of small size, light weight, high efficiency and low price, it has the tendency of replacing the linear power in the industry. However, these benefits of switching power supplies are somewhat offset by the electromagnetic interference they create. Due to the widespread use of switching power supply, people are concerned about how to limit the electromagnetic interference. For example, the recently adopted United States Federal Communications Commission (FCC) regulation is an attempt to limit electromagnetic interference from switching power supplies. While this charter is a fairly new regulation in the U.S. commercial market, it is somewhat time-honored in Europe to limit the maximum permissible electromagnetic interference. Europe’s most demanding agency for electromagnetic interference is the German Institute of Electrical Engineering (VDE) in West Germany. There is also a provision on interference is the United States military electromagnetic interference suppression standard (MIL). There is a clear difference in the range of electromagnetic interference provided by the FCC and the VDE, the main difference being due to the different purposes of the two agencies. Understanding these rules and their purpose is important for analyzing the electromagnetic interference characteristics of switching power supplies.