Diseño y construcción de un dispositivo de inversión DC/AC monofásico onda cuadrada a partir de un convertidor DC/DC con regulación en lazo cerrado.

Abstract

A device was developed which shows from DC to direct current inverter behavior and operation (DC/AC) where its stage of stress elevation is appreciated through a switched font flyback DC/DC regulated with a closed loop controller, this control makes the output voltage reach a desired value to guarantee, in the investment stage, the nominal voltage value RMS; this device is oriented for didactic and learning purposes in power electronics subject. The flyback source uses, by magnetic permeability elevation reasons, a silicon steel core transformer, which was selected based on the energy transfer maximum sequence and the commutation frequency of available elements in the Ecuadorian market experimental analysis. The controller was based on the Ziegler & Nichols method, with the reaction curve study, which was evaluated with a pulses train in order to obtain a statistical result and whose electronic adaptation was incorporated into the study, obtaining a first-order model plus delay, using as a starting point to a computational study based on the error integral criterion that would allow do an integral times optimization and controller proportional values. The investment stage was carried out with a mosfets H bridge with microcontroller phase control, which guarantees the power elements switching without overlapping. Analytically it was possible to verify that both the overshoot and the output voltage establishment time are directly proportional. To avoid electrical failures in the system it is recommended no to connect loads that require more power than the design, due to the increase in current consumption, causing heating and breakdowns in the switching