48V to 1V Active Clamp Stacked Direct Forward Converter

Graduate Thesis Or Dissertation

Citations

Citeable URL: https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/4q77fs77w

Abstract

This thesis presents a 48 V-to-1 V stacked direct forward (SDF) dc-dc converter consisting of four 12 V-to- 1 V direct forward (DF) modules connected in input-series output-parallel (ISOP) configuration. In each DF module, there is no secondary-side inductance, and a single-ended forward transformer is driven at a high duty cycle to reduce the switch root-mean-square currents. An active clamp is employed on the primary side to reset the transformer, limit the switch voltage stress, and facilitate zero voltage switching. The approach is verified by simulation results on a 12 V-to-1 V, 50 A, 200 kHz prototype module using GaN devices and a planar transformer and having a peak efficiency of 93.9% and the full load efficiency of 91.8%. In this thesis, experimental results are presented for a 12 V-to-1 V DF prototype.

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