In this paper, a control method that improves performance of series-resonant converters that operate with a wide input-voltage and/or output-voltage range by substantially reducing their switching-frequency range. The switchingfrequency-range reduction is achieved by controlling the output voltage with a combination of variable-frequency and delaytime control. Variable-frequency control is employed to control the primary switches, while delay-time control is used to control secondary-side rectifier switches provided in place of diode rectifiers. The performance evaluation of the proposed control was done on a 690-W prototype operating in a 200-450-V inputvoltage range and delivering a 13.8-V output voltage. The prototype circuit exhibits the maximum full-load efficiency of 95.8% with a switching frequency variation from 48 kHz to 72 kHz over the entire input-voltage range.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.