驱动恒流负载的DC-DC变换器的能控性  

Controllability of DC-DC Converters With Constant Current Load

作　　者：徐志宇[1] 庄玮琳[1] 许维胜[1] 吴启迪[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《电工技术学报》2011年第8期44-49,共6页Transactions of China Electrotechnical Society

基　　金：国家863计划高新技术资助项目(2006AA05Z211)

摘　　要：考察DC-DC变换器驱动恒流负载时的能控性。用恒值电流沉表示恒流负载,则变换器可表示为双输入切换线性系统。①应用切换线性系统的判据,直接分析其能控性;②构建具有相同能控集的单输入切换系统,通过研究单输入系统间接地分析其能控性。证明了带恒流负载的DC-DC变换器在连续或断续导通模式下都是能控的,且可以在一个开关周期内实现。Boost型LED驱动电路的实验结果显示,当电源/负载阶跃扰动时,LED电流和输出电压都可以被控制在设计值。从而验证了能控性的分析结论。This paper investigates the controllability of DC-DC converters driving the constant current load.The constant current load is modeled as a constant current sink,thus the converter is described as a dual-input switched linear system.The controllability is studied by ① directly applying the criteria of switched linear systems.② analyzing the equivalent single-input system with the unique controllable state set as the original system.It is proved that the DC-DC converters driving a constant current load are controllable in both continuous and discontinuous conduction mode;moreover,the controllability can be realized in one switching period.The conclusions are validated by circuit experiments utilizing a Boost-LED driver,in which the LED current and output voltage could be regulated at designed values under supply/load step perturbations.

关 键 词：DC-DC变换器 恒流负载 切换线性系统 多输入系统 能控性 

分 类 号：TM1[电气工程—电工理论与新技术] TP13[自动化与计算机技术—控制理论与控制工程]