Projeto e implementação de um conversor CC-CC elevador-rebaixador de tensão para uma bancada didática de eletrônica de potência e controle digital de sistemas

Abstract

The present report describes the design and construction of a low-cost and low-size DC-DC step-up-down converter (also known as buck-boost converter) for a didactic bench that can be used in the experimental classes of the Fundamentals of Power Electronics and Systems Control disciplines of the Federal University of Santa Maria. Thus, the goal is to provide students with a device that will help them, through practice, to better understand the operation of this DC-DC converter topology, as well as to give the teachers a new tool to assist them in the teaching process. In this way, the converter must present low power and provide security and protection to the user if it makes incorrect use of the device. In addition, different values of capacitors, inductors and resistors can be selected, allowing students to carry out different designs. For the closed-loop operation of the converter, a printed circuit board (PCB) containing the instrumentation and control circuits is developed. Another PCB containing a gate driver circuit for the activation of the semiconductor switch is also required for the system operation. Thus, the set of these three components - buck-boost converter, instrumentation and control board and gate-driver circuit - form a didactic kit. The digital control Project of the converter is implemented, in which na ATmega328P microcontroller is used. Finally, the experimental results obtained are shown.