A Modified Step-Up DC-DC Flyback Converter with Active Snubber for Improved Efficiency

Cristian Pesce, Javier Riedemann, Ruben Pena, Werner Jara, Camilo Maury and Rodrigo Villalobos
Additional contact information
Cristian Pesce: Department of Electrical Engineering, Universidad de La Frontera, Temuco 4811230, Chile
Javier Riedemann: Department of Electrical Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso 2362804, Chile
Ruben Pena: Department of Electrical Engineering, Universidad de Concepción, Concepción 4030000, Chile
Werner Jara: Department of Electrical Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso 2362804, Chile
Camilo Maury: Department of Electrical Engineering, Universidad de La Frontera, Temuco 4811230, Chile
Rodrigo Villalobos: Department of Electrical Engineering, Universidad de La Frontera, Temuco 4811230, Chile

Energies, 2019, vol. 12, issue 11, 1-17

Abstract: The research on DC-DC power converters has been a matter of interest for years since this type of converter can be used in a wide range of applications. The main research is focused on increasing the converter voltage gain while obtaining a good efficiency and reliability. Among the different DC-DC converters, the flyback topology is well-known and widely used. In this paper, a novel high efficiency modified step-up DC-DC flyback converter is presented. The converter is based on a N -stages flyback converter with parallel connected inputs and series-connected outputs. The use of a single main diode and output capacitor reduces the number of passive elements and allows for a more economical implementation compared with interleaved flyback topologies. High efficiency is obtained by including an active snubber circuit, which returns the energy stored in the leakage inductance of the flyback transformers back to the input power supply. A 4.7 kW laboratory prototype is implemented considering four flyback stages with an input voltage of 96 V and an output voltage of 590 V, obtaining an efficiency of 95%. The converter operates in discontinuous current mode then facilitating the output voltage controller design. Experimental results are presented and discussed.

Keywords: DC-DC power converters; DC power supply; snubber (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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