Convertidores aislados DC-DC para uso en aplicaciones de energía fotovoltaica : Convertidor DC-DC aislado directo (Forward).

Abstract

The objective of this curricular integration work is the design and implementation of an isolated converter DC-DC Forward topology with three windings for photovoltaic applications. The Forward converter works in continuous conduction, to be able to work with a photovoltaic module to supply a maximum power of 50 [W], therefore, the converter has the capacity to supply with an input voltage of 18 [V] and a maximum input current of 3 [A]. Throughout the following pages, the structure of said converter will be explained, through the parts and operation of each electronic device that makes it up. The converter control uses a TL494 analog digital integrated circuit, which has the ability to manage the MOSFET gate and the transformer primary current control system with its PI type controller, to maintain the current at the value of the reference current. Components of the converter like transformer and inductor are taken from the recycled computer Sources. Also, the mathematical model and simulations of the converter are obtained in the Simulink of Matlab, in order to compare their results. The obtained prototype is embodied in a welded PCB board with all its electronic components that were found in the design of the converter. In addition, the converter is tested with a DC voltage source from the Power Electronics Laboratory to obtain the different voltage and current waveforms of the converter and to determine the average efficiency of the converter. Finally, the conclusions and recommendations of this work are presented.