EMC considerations of air-gapped PFC inductor for lighting equipment applications

This paper presents an innovative curved air-gapped (CAG) inductor solution improving harmonic issues related to lighting equipment applications. The effective mathematical inductance model of the proposed CAG design is derived and verified experimentally in terms of harmonic and EMI emissions. A new LC filter configuration is examined to improve 2^nd and 3^rd order harmonics effectively. A complete optimal PFC inductor design procedure is given in terms of power loss and 3 different ferrite materials.