一种基于开关电流积分器的RB-COT Buck变换器  

A RB-COT Controlled Buck Converter Based on Switched Current Integrator

作　　者：程雨凡 甄少伟[1] 杨涛[1] 吴东铭 梁景博 刘子意 罗萍[1,2] 张波 CHENG Yufan;ZHEN Shaowei;YANG Tao;WU Dongming;LIANG Jingbo;LIU Ziyi;LUO Ping;ZHANG Bo(State Key Lab.of Elec.Thin Films and Integr.Dev.,Univ.of Elec.Sci.and Technol.of China,Chengdu 610054,P.R.China;Institute of Electronic and Information Engineering of UESTC in Guangdong,Dongguan,Guangdong523808,P.R.China)

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 [2]电子科技大学广东电子信息工程研究院,广东东莞523808

出　　处：《微电子学》2022年第5期797-802,共6页Microelectronics

基　　金：广东省基础与应用基础研究基金资助项目(2021A1515011309)。

摘　　要：提出了一种基于开关电流积分器的RB-COT Buck变换器。通过注入电感电流纹波补偿控制环路,引入采样保持电路消除电感电流纹波的直流分量,提高了输出电压的精度。在此基础上,开关电流积分器替代原架构中的固定RC滤波器,有效提升了高工作频率下系统的响应速度,并在全频率范围内兼顾稳定性与响应速度。以全频率范围内环路稳定性作为设计基本准则,该Buck变换器在高开关频率下响应速度得到了有效提升。在1 MHz开关频率下,负载阶跃的恢复时间相比于采用固定RC滤波减少了20μs。A ripple-based constant on-time control(RB-COT) buck converter with switched current integrator is proposed. The direct feedback loop was compensated by inductor current ripple, and the sample-hold circuit was introduced to improve output accuracy. Furthermore, the switched current integrator circuit replaced the fixed RC filter in the original architecture, effectively improved the transient response of the system at high switching frequency, and achieved both stability and fast transient response for full switching frequency range. Taking the loop stability in the full switching frequency range as the basic design criterion, the buck converter designed in this paper effectively improved the transient response, especially for high-switching frequency. For 1.0 MHz switching frequency, the step up/down transient recovery time is reduced by 20 μs compared with fixed RC filter.

关 键 词：开关电流积分器 基于纹波的恒定导通时间控制方式 BUCK变换器 

分 类 号：TN86[电子电信—信息与通信工程] TN433