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1.引言 开关电源是综合应用半导体变流技术、电子及电磁技术、自动控制技术等电力电子先进技术的产品。它和线性稳压电源相比,具有功耗小、效率高、体积小、重量轻及稳压范围宽等突出的特点,因而被广泛应用于计算机、外围设备、通信、工业自动控制及家用电器等领域。但开关电源的突出缺点是产生较强的电磁干扰(EMI)。它产生的EMI信号,既占有很宽的频率范围,又有一定的幅度。这些EMI信号经过传导和辐射方式污染电磁环境,对通信设备和电子仪器造成干扰。如果处理不当,开关电源本身就会变成一个干
1. Introduction Switching power supply is a comprehensive application of semiconductor technology, electronic and electromagnetic technology, automatic control technology and other advanced products of power electronics. Compared with the linear regulated power supply, it has many prominent features such as low power consumption, high efficiency, small size, light weight and wide voltage range. It is widely used in computers, peripherals, communications, industrial automation and home appliances Other fields. But the outstanding disadvantage of switching power supply is to produce strong electromagnetic interference (EMI). EMI signal it generates, both occupy a wide range of frequencies, but also a certain magnitude. These EMI signals pollute the electromagnetic environment through conduction and radiation, interfering with communications equipment and electronics. If not handled properly, the switching power supply itself will become a dry