【摘要】 针对军用电子元器件国产化的应用要求，对标美国SynQor公司MCOTS-C-28型1/4砖电源产品，设计了一种基于有源钳位正激的高效软开关DC/DC变换器。采用有源钳位技术，提高了磁芯利用率，缩小了产品体积，同时降低了电压应力对开关管的影响，减小了导通损耗；采用外驱动同步整流技术，有效降低了输出端的整流损耗，提高了变换效率。仿真和试验结果表明，主电路实现了ZVS软开关。在-55℃～100℃工作温度下，输入电压在16 V～40 V宽输入范围内，输出电压基本稳定在28 V,纹波噪声为34 mV,满载时转换效率高达94.8%。产品所用元器件均由国内厂商自主研制，完全满足国产化使用需求。更多还原

【Abstract】 Aiming at the goal of military electronic components localization, with the MCOTS-C-28 1/4 brick power supply made by SynQor company in the United States as the target, an active clamp forward DC/DC converter with efficient soft switching is designed. The active clamp technology is employed to improve utilization of magnetic core and reduce the volume of product, at the same time the voltage stress of switch tube and conduction losses are reduced. The external-driven synchronous rectification technology is employed to reduce rectifier loss of output effectively and improve the conversion efficiency. The results of simulation and experiment show that the zero-voltage-switching(ZVS)of main circuit can be realized. When the temperature changes from-55 ℃ to 100 ℃ and the input voltage wide ranges from 16 V to 40 V,the output voltage is basically stable at 28 V,the ripple noise is only 34 mV and the full load conversion efficiency is up to 94.8%. All components used in the product are independently developed by domestic manufacturers, meeting the needs of localization completely.更多还原