Analysis and design of EMI filter for multi-output switching mode power supply

摘要

In this paper, a generalized method has been used to discuss the influence of the EMI filter on the stability and the performance of multi-output switching mode power supplies. Criteria for the design of single stage EMI filters are proposed. These criteria satisfy the requirement of specification for EMI and guarantee the system to be stable at the same time. Furthermore, whether there exists a post regulator or a preregulator in the system, or a single output system, the generalized formula of performance derived in this paper always performs well.