Abstract

MARTINEZ SARMIENTO, Freedy Hernán  and  CASTIBLANCO ORTIZ, Mariela. UPS single-phase rectifier with reduction of current harmonic content. Tecnura [online]. 2011, vol.15, n.28, pp.23-31. ISSN 0123-921X.

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 a scheme 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 the harmonic 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 order to 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, an excellent behavior in dynamic answer and reduction of harmonic content was observed.

Keywords : Hysteresis control; Current distortion; Active rectifier.

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