Double-coupled current-fed push-pull DC/DC converter: Analysis and experimentation

Abstract

This paper presents the double-coupled current-fed push-pull dc/dc converter which operates from 0 to 100% of duty cycle. One primary winding in the transformer, low rms current in the output capacitor, double switching frequency in the input and the output filter, null ripple current in the input and in the output for 50% of duty cycle, are some characteristics of this new topology. These allow reductions of size and weight of the components.Qualitative and quantitative analysis are presented, in which the simplified model of the inductor coupled and the ideal model of the transformer are used. Finally, experimental results of a prototype are shown for the converter operating with a duty cycle higher or lower than 50%.The possible applications of this topology are automotive, electric power generation such as fuel cells, solar and wind.Keywords -Buck-boost, dc/dc isolated, flyback and push-pull converters.

Analysis of State-of-the-Art Converter Topologies for Interfacing of Hydrogen Buffer with Renewable Energy Systems

“…The inverters used in the DC/DC converters could be subdivided as two-level and three-level [44][45][46]. In turn, both types of inverters can be classified into voltage source inverters (VSI) [20][21][22][23][24][25], current source inverters (CSI) [26][27][28][29][30][31][32][33][34][35][36] and Z-source (impedance source) inverters (ZSI) [37][38][39][40][41][42][43]. All these inverter types can be used for FC applications.…”

“…The single-phase PP CSI topology described in [33] was modified by adding two coupled inductors to expand the duty cycle operation of the DC/DC converter. The proposed double-coupled PP CSI is shown in Fig.…”