开关DC-DC变换器电容电流脉冲序列控制  

Capacitor Current Pulse Train Control for Switching DC-DC Converter

作　　者：许丽君[1] 沙金[1] 许多[1] 钟曙[1] Sha Jin;Xu Duo;Zhong Shu(Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education Southwest Jiaotong University Chengdu 610031 China)

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),成都610031

出　　处：《电工技术学报》2016年第18期100-107,共8页Transactions of China Electrotechnical Society

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

摘　　要：提出一种电容电流脉冲序列(CC-PT)控制技术。与传统脉冲序列(PT)控制技术不同,CC-PT控制技术通过采样电容电流与预设高、低基准电流比较,得到两组频率相同、占空比变化的高、低功率控制脉冲。以CC-PT控制Buck变换器为例,阐述了其工作原理,分析了其控制特性。理论分析与实验结果表明,CC-PT控制技术采用电容电流作为内环反馈,限制了电感电流纹波的变化范围,有效抑制了低频振荡,减小了变换器输出电压纹波。实验结果表明,CC-PT控制连续导电模式(CCM)开关变换器同样具有PT控制瞬态响应速度快的优点,且具有比PT优越的稳态特性。This paper proposes capacitor current pulse train (CC-PT) control technique for buckconverter. Different from the conventional pulse train (PT) control technique, the high and low powercontrol pulses of CC-PT control which have the same frequency but different duty cycles are generated,by sensing the capacitor current and comparing with two different control currents. The controlprinciple and character of CC-PT-controlled Buck converter operating in both discontinuous conditionmode (DCM) and continuous conduction mode (CCM) are presented. The theoretical analysis showsthat taken the capacitor current as the current inner loop, the inductor current ripple is limited and thelow-frequency oscillation phenomenon can be eliminate effectively. The experimental results show thatCC-PT control benefits from fast transient response, furthermore, the steady-state performance ofCC-PT-controlled buck converter is better than that of PT-controlled buck converter.

关 键 词：电容电流 脉冲序列 电流连续模式 BUCK变换器 

分 类 号：TM461[电气工程—电器]