Conversor CC-CC boost baseado na célula de comutação de três estados para alimentação de inversores com divisor capacitivo

Abstract

This work presents a high gain boost DC-DC converter based on three-state switching cell for supply power the inverters with capacitive divisor. The converter is analyzed in continuous conduction mode (CCM) with a duty cycle value of the switches greater than 0.5, switches working on overlapping mode. The main characteristics of this converter are: It operates with high switching frequency and the input inductor operates with the double of the frequency switching, in order to minimize the system weight and volume, the voltage stress across the switches is lower than a half of the output voltage and naturally clamped by one output capacitor, allowing the use of transistors MOSFET with low static drain-to-source on- resistance, RDS(on), the input current is with small ripple, the output voltage can be elevated by incrementing the transformer turns ratio without compromising the voltage stress across the switches, the output voltage is balanced and adequate for supply power the inverters with capacitive divisor. The principle of operation, the design methodology, the simulation and the experimental results of a 1kW prototype are presented to validate the theoretical analysis and demonstrate converter performance.