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A novel connection approach based on development of the high permittivity materials for EMI filter design

High frequency is one of the main trends of development in power electronics, which will lead to the problems of the electromagnetic interference. The key to improve this phenomenon is EMI filter. In order to increase the power density, a kind of high permittivity material (CCTO) is proposed in this paper. Then, based on this material, we proposed a new connection approach, and applying it to the EMI filter. After analyzing the coupling modes under the conditions of the common mode (CM) and differential mode (DM) current, the equivalent circuits are given. Meantime, the prototype of EMI filter is proposed, which is used in the low power PFC supply. Finally, the effectiveness and the superiority of the new structure are verified by experiment.