伪连续导电模式Buck变换器的动态参考电流控制策略  

Dynamic-Reference-Current Control Strategy for Buck Converter in Pesudo Continuous Conduction Mode

作　　者：崔恒丰 周国华[1] 陈兴[1] Cui Hengfeng;Zhou Guohua;Chen Xing(School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China)

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电工技术学报》2017年第2期246-254,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(61371033);霍英东教育基金会高等院校青年教师基金(142027);四川省青年科技基金(2014JQ0015;2013JQ0033)资助项目

摘　　要：为了提高工作于伪连续导电模式(PCCM)的Buck变换器的效率和瞬态响应速度,提出了一种新型动态参考电流(DRC)控制策略。DRC控制方式通过采样Buck变换器的电感电流信号和负载电流信号,并将两者进行加权平均,获得电感续流的动态参考电流信号。与传统恒定参考电流控制的PCCM Buck变换器相比,DRC控制的PCCM Buck变换器通过反馈负载电流提高了电路的轻载工作效率以及轻载时的输出电压纹波。通过引入电感电流信息和负载电流信息提高了电路的动态性能。仿真与实验结果均验证理论分析的正确性。A novel dynamic-reference-current(DRC)control strategy is proposed to improve theconversion efficiency and transient response of buck converter operating in pesudo continuousconduction mode(PCCM).Herein,the dynamic reference current for inductor freewheeling is obtainedby the weighted average of the load current and the sensed inductor current.Compared with theconventional constant-reference-current controlled PCCM buck converter,DRC controlled PCCM buckconverter improves the conversion efficiency and output voltage ripple under light load by load currentfeedback,and also improves the transient response by introducing the inductor current and load current.Theoretical analysis is verified by simulation and experimental results.

关 键 词：开关变换器 伪连续导电模式 动态参考电流 瞬态响应 变换效率 

分 类 号：TM46[电气工程—电器]