为提升同步整流型Boost拓扑在轻载条件下的效率,采用变频准方波模式（QSW-ZVS）代替恒频三角波模式（TCM）。借助氮化镓（GaN）器件,可进一步提高变换器的工作频率,提升功率密度。为确保高频工况下的软开关实现,对QSW-ZVS模式下的软开关过程进行精确数学建模。在此基础上,指出延长同步整流的时间可扩大软开关的实现范围,这有助于提高变换器在高频QSW-ZVS模式下的效率。最后,搭建一台额定功率为500 W的实验样机,通过实现其QSW-ZVS模式下的软开关,峰值效率达到98.2%,实现了高频高效的设计目标,验证了理论分析的准确性和正确性。
Abstract
In order to improve the efficiency of the Synchronous rectification Boost topology under light load conditions, quasi-square wave mode with soft switching（QSW-ZVS） is used instead of the triangular current mode（TCM）. With the help of gallium nitride（GaN） devices, the operating frequency of the converter can be further increased, and the power density can be improved. In order to ensure the realization of soft switching under high frequency conditions, this paper carries out precise mathematical modeling of the soft switching in QSW-ZVS mode. On this basis, it is pointed out that the realization range of soft switching can be extended by extending the time of synchronous rectification. This helps to improve the efficiency of QSW-ZVS mode under high frequency conditions. Finally, an experimental prototype with a rated power of 500 W is built. By realizing its soft switching in QSW-ZVS mode, the peak efficiency reaches 98.2%. The design goals of high frequency and high efficiency are achieved, which verifies the accuracy and correctness of the theoretical analysis.
关键词
微电网 /
Boost变换器 /
氮化镓 /
同步整流 /
准方波
Key words
microgrid /
Boost converter /
gallium nitride /
synchronous rectification /
quasi-square-wave
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基金
2021年天津市研究生科研创新项目（航空专项）（2021YJSO2S01）
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