基于氮化镓的反激同步整流DC/DC变换器设计

Design of Synchronous Rectifier Flyback DC/DC Converter Based on GaN

给出了一种适合低轨商用航天的中小功率DC/DC变换器的设计方法。该方法采用了反激同步整流拓扑和表贴器件,可以覆盖常见的航天用中小功率单路及多路输出DC/DC变换器需求,具备低成本、高性能、高可靠、可批量化生产的优点。为了进一步提高转换效率和功率密度,还应用了氮化镓GaN(gallium nitride)功率开关。并且对不同工作条件下拓扑中主要功率器件的损耗进行了计算和对比分析。最后,以一款宽输入电压范围(23~47 V),输出5 V@30 W的电源变换器为例对所提方法进行了验证。

A design method for small-and medium-power DC/DC converters suitable for low-orbit commercial aerospace is given in this paper.A synchronous rectifier flyback topology and surface mounted devices are adopted,which can meet the demands for common single-and multi-output DC/DC converters applied in aerospace,with advantages of low cost,high performance,high reliability,and mass production.To further improve the conversion efficiency and power density,gallium nitride(GaN)FETs are also used.In addition,the losses of main power devices in the topology under different operating conditions are calculated and compared.Finally,a DC/DC converter with a wide range of input voltage(23-47 V)and output of 5 V and 30 W was built for verification.