Convertidores Aislados DC-DC para uso en aplicaciones de energía fotovoltaica : Convertidor DC-DC Aislado directo en dos cuadrantes.

Abstract

Within the project "Isolated DC-DC Converters for use in photovoltaic energy applications", the purpose of this curricular integration work is to design and implement a direct isolated DC-DC converter in two quadrants, also known as a Two-Switch Forward, to use it in photovoltaic applications, considering that the circuit will work without a maximum power point MPPT, for this reason a battery will be used as a load to maintain the stable output voltage. The front converter with two switches is designed to operate in continuous conduction mode at a maximum power of 50W, the main element to study and design in this converter is the Switch Mode Power Supply transformer, whose basic parameters will be determined experimentally, to later determine the number of turns of each winding. The TL494 pulse width modulator will be connected to control the current supplied by the photovoltaic panel (laboratory DC source), its internal components are used from this integrated circuit to implement the PI controller, limit the maximum pulse width, and select the frequency of operation, among other useful functions for this project. To carry out the performance tests, a printed circuit board is built, and it is confirmed that the current control is adequate and can withstand sudden changes in reference and even variations in the voltage of the source. In the same way, efficiency tests power range are carried out in to determine the effectiveness of the prototype.