A Novel 200~800Vdc Ultra-wide Range Input Dc-Dc Converter with Optimum Intelligent Polymorphic Topologies

A novel high efficiency polymorphic topology converter whose input range extends to 200~800 Vdc, while the high line input efficiency is still maintained is presented in this paper. By integrated a novel three-level HB L²C converter and a conventional PSFB converter together, the proposed converter intelligently estimate the input voltage condition and automatically change its internal topology forms to be the most efficient. Therefore, the conversion efficiency for low line input would not downgrade too much and high line efficiency gains back, where the overall efficiency curve exhibits as a "V" type and optimizes. Besides, ZVS and ZCS switching advantages are still be featured in the very two internal topologies themselves, and only one set of circuit components is adopted to implement both of these two topologies to be cost-effective, based on the nearly the same voltage/current stress of the main components. The detail operation principles, as well as the design considerations, were presented. A prototype aiming at network and telecom system of 200~800 V input, 54 V/10 A output, whose full load conversion efficiency is all above 91.48%, was developed to verify the validity and applicability of this topology.