Conversor CA-CC com tensão de entrada 110/220V e alto fator de potência baseado no Flyback intercalado de duas chaves

Abstract

The work presents the study of an AC-DC converter with two imput 110V and 220V characteristics and high power factor based on the topology of the flyback converter interleaved by two switches. The proposed converter features: operation with two values of alternating input voltage by manually selection, high power factor for both input voltages, high frequency galvanic isolation, output voltage regulation due to the closed-loop operation, semiconductors low voltage (less than 600 V), LC filter reduced due to the use of interleaved converters; at 110 V input voltage the current circulates through less semiconductors which improves performance. To perform the power flow control from the input to the output and to obtain the power factor correction, controlling by critical current mode is used. For the proposed converter, qualitative analysis and quantitative analysis are performed for input voltages levels of 220 V and 110 V. Since two Flyback converters with the same characteristics in voltage and current are intercalated, it was necessary to dimension only a single converter processing half the output power. As the input currents of each Flyback have a critical and pulsed conduction mode, it is necessary to design a single LC filter for both interleaved converters. For the effective input voltages of 220 V and 110 V, output power of 1 kW, output voltage of 250 V, the simulation results are presented consisting of waveforms and curves in steady state and in dynamic operation regime. Expected results were obtained at the end of the work, however, only the converter parallelism technique was adopted, which not significantly reduced the LC input filter and besides for the 110 V input voltage, the filter did not operate precisely, but beyond that in general the results obtained from voltage, current, power factor and efficiency were achieved.