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基于GaN器件Buck电路死区功耗分析与优化

更新时间:2020-09-16 08:14:34 大小:6M 上传用户:守着阳光1985查看TA发布的资源 标签:GaN器buck电路 下载积分:1分 评价赚积分 (如何评价?) 收藏 评论(0) 举报

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氮化镓功率器件以其优异的高速、高效特性而有望在电源转换领域取得广泛应用。在Buck开关电源应用中,系统采用GaN HEMT替换传统Si功率器件后,系统死区损耗成为阻碍系统效率提升的一个重要因素。针对GaN器件的电源转换系统死区功耗展开理论及仿真讨论,详细分析Si功率器件与GaN HEMT在buck型开关电源系统中不同的工作机制以及死区时间对系统功耗的影响。优化结果表明,输入电压为12 V、输出电压为1.2 V、开关频率为700 k Hz的GaN基电源转换系统,在死区时间Td1=20 ns、Td2=0 ns、负载电流为20 A的情况下系统转换效率可达到92%。

GaN-based power device is expected to be widely used in power converter system, owing to its superior characteristics of high-speed and high-efficiency, it is important that the dead-time related loss of GaN-based HEMT devices have negative impact on improving system efficiency in application of buck converter. In order to accurately assess the influence of the dead-time related loss on converter efficiency, analytical model combined with simulation results for dead-time related loss of GaN-based devices upon power converter system has been discussed and optimized in this letter. The different operating principle of buck converter system is discussed in Si-MO...

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