具有单步死区时间控制的3态降压-升压直流-直流转换器  

Tri-mode Buck-boost DC-DC Converter with On-step Dead-time Control

作　　者：程思璐 姚素英[1] 金戈[2] 吴炜东 

机构地区：[1]天津大学电子信息与工程学院,天津300072 [2]多伦多大学电子与计算机工程系

出　　处：《南开大学学报（自然科学版）》2015年第5期107-111,共5页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：天津市科技支撑计划项目(13ZCZDGX02000)

摘　　要：为了提高能量转换效率,扩大输入输出电压范围,研究了在直流-直流转换器中功率传输门结构及死区时间对SMPS（switched-mode power supply）转换器效率与稳定性的影响.不适当的死区时间会产生直流通路导通（cross-conduction）及体2极管导通（body-diode conduction）现象影响转换效率,提出单步死区时间控制的方法使能量转换效率更高.根据3态非反向降压-升压转换器工作原理,分别分析了功率传输门可以扩大输入输出电压范围的工作原理,提出传输门结构可以用来替代输出级上管.基于降压-升压转换器及FPGA开发板,搭建了直流-直流降压-升压转换器测试系统.该转换器输入电压Vin范围为2.7～5.7 V,输出电压Vout为0.3～6.8 V,输出电流可以高达6 A,转换效率可提高4%.In order to improve the conversion efficiency and extend the Voutrange, the DC-DC converter with transmission gate and how the dead-time affects the efficiency and stability of SMPS converters are studied. Dead-time is required to prevent the unwanted cross-conduction current flowing through the high-side and low-side switching devices. However, an excessively long dead-times has negative impact on the power conversion efficiency as it will lead to body-diode conduction. An improvement in peak power conversion efficiency of 4% is observed. This converter accepts Vinfrom 2.7 to 5.7 V and generates Voutfrom 0.3 to 6.8 V with output current ranging from 0 to 6 A.

关 键 词：直流-直流转换器 死区时间 传输门 转换效率 

分 类 号：TN492[电子电信—微电子学与固体电子学]