Closed-Form Solution for Core Loss Calculation in Single-Phase Bridgeless PFC Rectifiers Based on the iGSE Method

This letter proposes a closed-form solution for core loss computation exemplarily for the boost inductor of a single-phase power factor correction boost bridgeless converter. The core loss calculation is based on the improved generalized Steinmetz equation (iGSE) method, which consists in the separation of the contributions of major and minor loops in the B-H curve. However, the computational procedure based on loop separation routine of the iGSE is replaced here with an integral-based computation. This leads to the advantage that the resulting expressions are in a closed form that is suitable for optimization routines. The proposed method can be extended to other converters. Three different design results are compared with two standard numerical iGSE routines, one made by the authors and the original routine made by the iGSE authors. Experimental results for a fourth case are presented. The importance of modeling the major loop losses is also discussed.