Simulation of high-efficiency interleaved step-up DC-DC boost-flyback converter to use in photovoltaic system
2014
scientific article
english
EN In low-voltage photovoltaic (PV) systems high-efficiency high voltage gain step-up DC-DC converters are required as the interface between the PV panel and the load. Therefore overall performance of the PV system is essentially affected by the efficiency of step-up DC-DC converter itself. This paper presents the results of PSpice simulation of high-efficiency interleaved step-up DC-DC converter. The converter integrates boost and flyback topologies. Interleaved approach minimizes the current stress on the switches as well as allows reducing a sizes of the inductors but also decreases input current ripples. The other advantage of interleaving structure is flexibility of number of working phases extension. The number of working phases can be dynamically determined depending on the power requirements of the load. High efficiency assured by boost-flyback topology is achieved by the means of recycling the energy from input leakage inductance and relatively low voltage stress across the transistor switches which enables low drain-to-source resistance transistors application. The simulation carried out will present transient and performance characteristics of interleaved step-up DC-DC boost-flyback converter.
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