de Seixas, FJMBarbi, I2014-05-202014-05-202004-03-01IEEE Transactions on Power Electronics. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc., v. 19, n. 2, p. 371-377, 2004.0885-8993http://hdl.handle.net/11449/36121A robust 12 kW rectifier with low THD in the line currents, based on an 18-pulse transformer arrangement with reduced kVA capacities followed by a high-frequency isolation stage is presented in this work. Three full-bridge (buck-based) converters are used to allow galvanic isolation and to balance the dc-link currents, without current sensing or current controller. The topology provides a regulated dc output with a very simple and well-known control strategy and natural three-phase power factor correction. The phase-shift PWM technique, with zero-voltage switching is used for the high-frequency dc-dc stage. Analytical results from Fourier analysis of winding currents and the vector diagram of winding voltages are presented. Experimental results from a 12 kW prototype are shown in the paper to verify the efficiency, robustness and simplicity of the command circuitry to the proposed concept.371-377engAC-DC converterautotransformer18-pulseharmonicshigh-frequency conversionpower factor correctionArtigo10.1109/TPEL.2003.823201WOS:000220162400014Acesso restrito