开关DC-DC变换器的自适应占空比跨周期控制方法  

Pulse Skip with Adaptive Duty Ratio Control Technique for Switching DC-DC Converters

作　　者：李航标[1] 张波[1] 罗萍[1] 甄少伟[1] 廖鹏飞[1] 李肇基[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《电子与信息学报》2014年第9期2265-2271,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61274027);高等学校博士学科点专项科研基金(20120185110005)资助课题

摘　　要：针对脉冲跨周期调制(PSM)开关DC-DC变换器输出电压纹波较大的问题,该文提出一种新型的自适应占空比跨周期(ADPS)控制方法。在ADPS控制的变换器中,轻载下,每个周期变换器控制脉冲的占空比与该周期开始时输出电压与参考电压误差的平方根近似成正比:负载越轻,变换器的输出电压纹波越小。研究表明,ADPS控制的DC-DC变换器不仅具有比PSM控制的变换器更低的输出电压纹波,同时具有优异的鲁棒性和瞬态响应能力。Considering the issue of the large output voltage ripple of Pulse Skip Modulation （PSM） controlled switching DC-DC converter, a novel control technique named Pulse Skip with Adaptive Duty ratio （ADPS） is proposed in this paper. In ADPS converter with light load, the duty ratio of control pulse of each switching cycle is approximately proportional to the square root of the voltage error between the reference voltage and the output voltage at the beginning of the switching cycle. Also, the lighter the load is, the smaller the ripple is. The experimental results show that ADPS converter not only has lower output voltage ripple than PSM converter, but also has excellent control robustness and transient performance.

关 键 词：DC-DC变换器 集成电路 控制技术 自适应占空比跨周期 电流断续模式 输出电压纹波 

分 类 号：TN624[电子电信—电路与系统]