同步降压DC/DC变换器的损耗分析  

Loss analysis of a synchronous buck DC/DC converter

作　　者：王英静 纪飞 刘尚江 管月 WANG Yingjing;JI Fei;LIU Shangjiang;GUAN Yue(The 58th Institute of China Electronics Technology Group Corporation,Wuxi 214035,China)

机构地区：[1]中国电子科技集团公司第五十八研究所,江苏无锡214035

出　　处：《现代电子技术》2023年第12期39-42,共4页Modern Electronics Technique

摘　　要：同步降压DC/DC变换器以其高效稳定的优点被广泛应用于低压、大电流的场合,其功率损耗主要包括电感损耗、功率开关管损耗、同步整流管损耗、电容损耗和控制器损耗。文中对各部分损耗的原因进行详细分析并给出计算公式,其次,搭建实验电路验证理论计算的正确性;最后,计算出不同输出条件下的各部分损耗,根据损耗占比情况优化元器件选型,合理选择变换器的工作模式。Synchronous buck DC/DC converter is widely used in low voltage and heavy current occasions due to its high efficiency and stability.The power loss of the converter mainly includes inductance loss,power switching tube loss,synchronous rectifier bube loss,capacitance loss and controller loss.A detailed analysis on the causes of losses in each part is conducted,and the calculation formulas are provided.The experimental circuit was built to verify the correctness of the theoretical calculation.The loss of each part under different output conditions is figured out,and the component selection is optimized according to the ratio of loss,so as to reasonably select the working mode of the converter.

关 键 词：同步降压 大电流 DC/DC变换器 功率损耗 效率分析 损耗占比 

分 类 号：TN624-34[电子电信—电路与系统] TP391[自动化与计算机技术—计算机应用技术]