Hybrid Fixed/Variable Frequency TCM Average Current Control Method Enabling ZVS MHz Operation of GaN HEMTs in PFC Stages
2023 IEEE Applied Power Electronics Conference and Exposition (APEC)(2023)
摘要
The emergence of GaN semiconductors with superior figure-of-merit has opened up new possibilities of using advanced control schemes for further increasing the performance of next-generation PFC rectifiers. With the goal of achieving a high efficiency over a wide mains input voltage range for universal operation world-wide, in this paper, a novel modulation method of hybrid fixed/variable frequency TCM operation is presented. This method features a dynamic increase of switching frequency while still maintaining a full-ZVS operation over the entire line cycle, which leads to up to a 20 % reduction of system losses at light-load and/or high-line operation without the need for any additional circuitry.
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关键词
GaN HEMTs,ZVS,PFC rectifier,TCM
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