Litz-wire high-frequency gapped-transformer (Lw-HFGT) is a vital component that facilitates efficient operation of LLC converters. The converter designers go through cumbersome multiobjective optimization techniques, with many iterations, to obtain an… Click to show full abstract
Litz-wire high-frequency gapped-transformer (Lw-HFGT) is a vital component that facilitates efficient operation of LLC converters. The converter designers go through cumbersome multiobjective optimization techniques, with many iterations, to obtain an optimal Lw-HFGT design. High reliance on such techniques is due to deficiencies in existing analytical core and winding selection (CWS) methodologies; most analytical CWS models do not focus on optimization. Therefore, this article proposes noniterative analytical CWS methodology for Lw-HFGT based on an innovative optimal core-geometry factor model (OKGM). The aim is to obtain Lw-HFGT design with minimized losses and size, integrated magnetizing inductance, and temperature rise within limits. The method incorporates application requirements (excitation-voltage waveform, LLC circuit-parameters, thermal limit), along with Lw-HFGT physical characteristics [core geometrical features, peak flux density
               
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