动态电压调节开关变换器的定频导通时间控制  

Constant frequency turn-on time control of dynamic voltage scaling switching converters

作　　者：徐杨军[1] 许建平[1] 王金平[1] 何圣仲[1] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室西南交通大学电气工程学院,四川成都610031

出　　处：《电工电能新技术》2014年第7期28-32,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金(51177140);中央高校基本科研业务费专项基金(2682013ZT20)资助项目

摘　　要：对动态电压调节(Dynamic Voltage Scaling,DVS)开关变换器的定频导通时间(Constant Frequency Turn-On Time,CFOT)控制技术进行了研究,在恒定导通时间(Constant On-Time,COT)基础上,通过引入输入电压前馈和输出参考电压反馈环路,实现不同输入、输出电压条件下DVS开关变换器保持开关频率恒定。研究结果表明,CFOT控制不仅继承了传统COT控制环路设计简单、无需误差放大器及其相应的补偿网路、瞬态响应快的优点,而且消除了输入、输出电压变动对开关频率的影响。Constant Turn-On Time （COT） control technique has been widely used for industrial application. It regulates output voltage of switching converter by adjusting variation of switch frequency. Constant Frequency Turn-On Time （CFOT） control of dynamic voltage scaling switching converters is proposed in this paper. Based on the Constant On-Time, by the introduction of the input voltage feed-forward and output reference voltage feedback loop constant switching operating frequency under different input and/or output voltage conditions is realized. Research resuits show that similar to COT control technique, CFOT also benefits simple control loop and fast transient response, moreover, error amplifier and its corresponding compensation network are not needed. In addition, it can make the switching frequency independent of the variation of input voltage and output voltage.

关 键 词：COT控制 CFOT控制 恒定频率 动态电压调节 

分 类 号：TM46[电气工程—电器]