Analysis and Design of a High-Efficiency Full-Bridge Single-Stage Converter With Reduced Auxiliary Components
IEEE Transactions on Power Electronics Vol. 25, Nº 7, pp. 1850 - 1862, July, 2010.
ISSN (print): 0885-8993
Journal Impact Factor: 3,483 (in 2008)
Digital Object Identifier: 10.1109/TPEL.2010.2042970
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This paper presents a single stage circuit topology consisting of the association of a full-bridge isolated DC-DC converter and two input inductors and two input diodes connected to the mains network, in order to obtain an isolated AC/DC switch mode power supply (SMPS), with sinusoidal input current. The proposed topology does not use an input bridge rectifier, common in similar applications. The current into the two input inductors can, therefore, flow in both directions. Consequently, the proposed topology equally distributes the current by the four bridge transistors providing four input parallel boost power factor correctors, (PFC). The use of the four bridge transistors to obtain the PFC function and to regulate the output voltage with galvanic isolation is a new technique that makes this topology unique, which also contributes to improve the converter efficiency. The definition of appropriate control strategies permitting the accurate simultaneous regulation of output voltage and input current is hereby described. The interdependency between these two conversion processes is completely analysed allowing for useful design rules. Experimental results were obtained in a 650W laboratory prototype, to verify the theoretical study. A maximum efficiency of 94% was obtained.