High Efficiency Bus Provider for VLC Applications Based an Asymmetrical Half Bridge Converter with a Resonant DCX Auxiliary Output

Abstract

The Two-Input Buck (TI Buck) Converter has low voltage stress over the switches, very high efficiency, and low harmonic components. Therefore, it is a prominent topology to work as a post-regulator in Visible Light Communication (VLC) systems. This works proposes a combination of an Asymmetrical Half Bridge (AHB) and a resonant dc-dc unregulated converter (DCX) to supply the two input voltage sources of the TI Buck based post-regulator. Due to the similarity in the primary side of these two converters (i.e AHB and DCX), the auxiliar DCX subcircuit will be coupled to the AHB without increasing the number of controlled switches. The topology, as well as the design constraints are studied in this paper. As example, a 45W AHB with an auxiliar DCX source is build. The topology reaches 94% of efficiency with the proposed independent behavior between the output voltages.