Retificador PFC Monofásico Bridgeless Baseado em Interruptores GaN HEMT Empregando Estratégia de Modulação Pwm de Alta Resolução Implementada em FPGA
DOI:
https://doi.org/10.18618/REP.2019.2.00271Keywords:
Boost bridgeless, correção de fator de potência, GaN HEMT, Modulador de alta resoluçãoAbstract
Interruptores de potência baseados em materiais do tipo wide bandgap propiciam o uso de elevada frequência de comutação sem aumento significativo das perdas do conversor. O artigo propõe a validação experimental de um retificador boost bridgeless com correção ativa do fator de potência, empregando interruptores de Nitreto de Gálio e utilizando um modulador de alta resolução. O protótipo, com uso de 500 kHz na frequência de comutação, é validado com tensão de suprimento em 127 V e 60 Hz, acionando uma carga passiva de 915 W com tensão média de 220 V. Os resultados obtidos demonstram a funcionalidade do conversor estático operando com 96% de rendimento em plena carga, assim como a operação da estratégia de modulação PWM de alta resolução e de controle digital implementadas em FPGA.
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