返驰式电路在开关电源EMI抑制中的应用

Application of Flyback Circuit in EMI Suppression of Switching Power Supply

开关电源目前是电子设备电源模块设计中使用最广泛、最成熟的电源设计,但因其开关频率的影响,使得开关电源自身又是一个噪声源,极易与其他频率的噪声产生共振或者耦合,致使开关电源的EMI测试不达标,影响系统的稳定性。为了解决这个问题,提出返驰式电源控制方案,并详细阐述了方案的工作过程、测试方法和测量结果。

At present,switching power supply is the most widely used and mature power supply design in power module design of electronic equipment.However,due to the influence of switching frequency,the switching power supply itself is a noise source.It is easy to resonate or couple with the noise of other frequencies,which makes the EMI test of the switching power supply not up to the standard and affects the stability of the system.In order to solve this problem,a flyback power supply control scheme is proposed,and its working process,testing methods and measurement results are described in detail.