开关电源主要干扰源的抑制

Suppressing Main EMI Source of Switching Power Supplies

详细分析了开关电源中电磁干扰的产生机理。采用电磁干扰滤波器、功率因数校正、缓冲吸收和软开关谐振电路、调频技术等措施分别对开关电源中整流电路、开关电路、二次整流电路及其触发控制电路所产生的外部干扰源和内部干扰源进行了抑制。通过实验验证了几种方法对EMI传导的抑制效果,使电源系统达到了CISPER EN550022B的标准。

In this paper,the principle of EMI in switching power supply is analysed in detail.To suppress EMI sources of exterior ＆ interior in （Switching Mode Power Supply,简称SMPS） ,which are derived from rectifier circuit, switching circuit, second rectifier circuit and trigger control circuit,EMI filter, power factor correction and soft switching circuit, and snubber circuit, FM technology and the like are adopted respectively.Some methods for suppressing EMI transmission are proved in experiments and system have attained to CISPER EN550022B standards.