1 MHz硅器件LLC-DCX变换器设计与优化  

Design and Optimization of 1 MHzz Silicon Device LLC-DCX Converter

作　　者：尹庆隆 周治成 吕托 崔梦宇 YIN Qing-long;ZHOU Zhi-cheng;LU Tuo;CUI Meng-yu(Beijing Aerospace Wanyuan Technology Co.,Ltd.,Beijing 100000,China;不详)

机构地区：[1]北京航天万源科技有限公司,北京100000 [2]南京航空航天大学,江苏省新能源发电与电能变换重点实验室,江苏南京210016

出　　处：《电力电子技术》2024年第8期83-86,共4页Power Electronics

基　　金：国家自然科学基金(52177181)。

摘　　要：LLC-DCX变换器的软开关特性可以显著降低开关损耗及器件应力,在航空航天等高功率密度要求的场景下,是一种实现母线电压变换以及电气隔离功能的优异拓扑。高功率密度意味着高开关频率,但在这些应用场景下宽禁带器件的应用受到了限制。这里讨论了传统硅器件在高频LLC-DCX变换器中的设计与应用,通过对变换器在死区时间内的等效电路进行时域分析,推导得到一个考虑同步整流管结电容影响的零电压开通条件。进一步利用状态平面建模方法推导了轻载下同步整流管的精确导通时间,提出一种开环同步整流控制策略,有效提高了变换器的轻载效率。最后,研制了一台基于硅器件的1 MHz LLC-DCX变换器样机,实验结果验证了所提设计方法及控制策略的有效性。The soft switching characteristics of LLC-DCX converters can significantly reduce switching losses and de-vice stress.In scenarios with high power density requirements such as aerospace,it is an excellent topology for achiev-ing bus voltage conversion and electrical isolation functions.High power density means high switching frequency,but the application of wide bandgap devices is limited in these application scenarios.The design and application of tradi-tional silicon devices in high-frequency LLC-DCX converters is discussed.Through the time-domain analysis of the eq-uivalent circuit of the converter during dead time,a zero voltage turn-on condition considering the influence of syn-chronous rectifier junction capacitance is derived.Further utilizing the state plane modeling method,the precise con-duction time of the synchronous rectifier under light load is derived,and an open-loop synchronous rectification con-trol strategy is proposed,effectively improving the light load efficiency of the converter.Finally,a prototype of a 1 MHz LLC-DCX converter based on silicon devices is developed,and the experimental results verify the effectiveness of the proposed design method and control strategy.

关 键 词：变换器 零电压开通 同步整流管 状态平面建模 

分 类 号：TM46[电气工程—电器]