Integrated design of EMI and passive filters for power electronic converters with PFC circuit

The design of a conducted electromagnetic interference (EMI) filter is always tedious work involving, normally, a trial-and-error process. Furthermore, it is possible for the equipped EMI filter to interfere with the function of the original circuit. This perplexing problem is especially critical for power converters with power factor correction. To solve this problem, an alternative approach with consecutive orthogonal arrays is proposed. Both EMI noise reduction and power factor correction are considered jointly by integrating the passive low-pass filter and the EMI filter into a single stage. The method, with consecutive orthogonal arrays, is applied to search for the satisfactory parameters of the filter to achieve the goals of low EMI noise and high power factor. By virtue of consecutive orthogonal arrays, the number of experiments can be effectively reduced before a set of satisfactory filter components is obtained. The design procedure and the inferential rules are illustrated by a design example.