摘要
为了提高恒定导通时间(constant on-time,COT)调制开关变换器的输出电压稳压精度,基于COT调制和双缘脉冲宽度调制的特点,提出了一种工作于电感电流连续导电模式(continuous conduction mode,CCM)的开关变换器双缘恒定导通时间(dual-edge constant on-time,DCOT)调制方法.介绍了DCOT调制数字电压型控制Buck变换器的工作原理,对比分析了COT调制和DCOT调制数字电压型控制Buck变换器的稳态性能和瞬态性能.结果表明:相比于COT调制,采用DCOT调制的数字电压型控制Buck变换器提高了输出电压的稳压精度,其大小为输出电压纹波峰峰值的50%,且瞬态调节时间减少了1个开关周期.最后,通过仿真和实验结果证明了理论分析的正确性.
To improve the accuracy of output regulation in a switching converter with constant on-time （COT） modulation, dual-edge constant-on time （DCOT） modulation scheme for the switching converter in continuous conduction mode was proposed, based on the characteristics of COT modulation and dual-edge pulse-width modulation. The principle of digital voltage-mode controlled Buck converter with DCOT modulation was introduced. Moreover, its steady-state and transient performances were analyzed and compared with those of digital voltage-mode controlled Buck converter with COT modulation. The results show that digital voltage-mode controlled Buck converter with DCOT modulation improves output-regulation accuracy by 50% of peak-to-peak value of output voltage ripple and reduces the transient regulation time by one switching cycle. Finally, the simulation and experimental results validate the correctness of the theoretical analysis.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2015年第1期13-19,35,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(61371033)
高等学校博士学科点专项科研基金资助项目(20130184120011)
霍英东教育基金会高等院校青年教师基金资助项目(142027)
四川省青年科技基金资助项目(2014JQ0015
2013JQ0033)
中央高校基本科研业务费专项资金资助项目(SWJTU11CX029)
