固定开关频率的COT控制Boost型DC⁃DC变换器研究  

Research on COT controlled Boost DC⁃DC converter with fixed switching frequency

作　　者：武华[1] 曾伟 彭莉 冯秀平 袁寿财[1] 陈艳艳 WU Hua;ZENG Wei;PENG Li;FENG Xiuping;YUAN Shoucai;CHEN Yanyan(College of Physics and Electronic Information,Gannan Normal University,Ganzhou 341000,China;Xinsheng Electronics Co.,Ltd.,Chengdu 611730,China)

机构地区：[1]赣南师范大学物理与电子信息学院,江西赣州341000 [2]芯盛电子有限公司,四川成都611730

出　　处：《现代电子技术》2021年第24期107-111,共5页Modern Electronics Technique

基　　金：江西省教育厅科技项目(GJJ201411);国家自然科学基金项目(61650404)。

摘　　要：文章提出一款基于固定开关频率的COT控制Boost型DC⁃DC变换器。以恒定导通时间控制模式为基础,将输入输出电压经过转换后与导通时间相联系,通过对元器件的参数设置来实现变换器的固定开关频率,减小因频率波动而产生的电磁干扰。利用Cadence spectre仿真平台,采用SMIC 0.18μm CMOS工艺完成系统的启动过程仿真、负载瞬态响应仿真、线性瞬态响应仿真以及电压纹波仿真。结果表明:系统正常启动并稳定输出;在不同的输入电压条件下,导通时间随之变化以维持工作频率的稳定,频率几乎不随负载电流的变化而变化,系统具有较快的瞬态响应速度;在输入电压变化的过程中,输出电压能较快地恢复稳定;输出电压纹波较低。The COT(constant on⁃time)controlled Boost DC⁃DC converter based on fixed switching frequency is proposed.Based on the COT control mode,the input and output voltage is converted and connected to the conduction time.The fixed switch frequency of the converter is realized by setting the parameters of the components,so as to reduce the electromagnetic interference caused by the frequency fluctuation.On the simulation platform of Cadence spectre,with the help of the process of SMIC 0.18μm CMOS,the system start⁃up process simulation,load transient response simulation,linear transient response simulation and voltage ripple simulation are completed.The results show that the system can start normally and output stably,and under different input voltage conditions,the conduction time changes with the voltage to maintain the stability of the working frequency,but the working frequency cannot change with the change of load current;the system has a fast transient response speed;the output voltage can recover stability quickly during the change of input voltage;the output voltage ripple is also low.

关 键 词：DC⁃DC变换器 COT控制 固定开关频率 导通时间 参数设置 仿真验证 

分 类 号：TN432-34[电子电信—微电子学与固体电子学]