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Rectificador monofásico para UPS con reducción de contenido armónico en la corriente de entrada

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Author(s): Fredy Hernán Martínez Sarmiento | Mariela Castiblanco Ortiz

Journal: Tecnura
ISSN 0123-921X

Volume: 15;
Issue: 28;
Start page: 23;
Date: 2011;
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Keywords: Hysteresis control | Current distortion | Active rectifier.

ABSTRACT
This paper presents the design, development and laboratory testing of a single-phase rectifier, designed for electric power supply of UPS systems up to 5 kW, with the particular characteristic to count on ascheme of reduction of harmonic content in the input current, of simple implementation and high speed response. The implemented prototype was equipped with a small and inexpensive Microchip PIC12F675 microcontroller as the central control unit, and the power circuit designed to work in the limit of continuous mode operation, with the idea of improving the efficiency of the system. A scheme of hysteresis control like general strategy for the reduction of theharmonic content was implemented, comparing the input current to a sinusoidal reference signal constructed and synchronized by the microcontroller to the power and the rated output voltage. In orderto verify the functionality and performance of the design scheme, simulations of the circuit of power and their control were realized, and a laboratory prototype of 300 W was constructed. In both cases, anexcellent behavior in dynamic answer and reduction of harmonic content was observed.

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