一种自适应时间常数匹配G_(m)-C电感电流采样方法  

An Adaptive Time Constant Matching G_(m)-C Inductor Current Sensing Method

作　　者：杨涛[1] 甄少伟[1,2] 蒋沈昊 程雨凡 齐钊 周春华[1] 罗萍[1] 张波[1] YANG Tao;ZHEN Shaowei;JIANG Shenhao;CHENG Yufan;QI Zhao;ZHOU Chunhua;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;Chongqing Institute of Microelectronics Industry Technology,UESTC,Chongqing,401331,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]电子科技大学重庆微电子产业技术研究院,重庆401331

出　　处：《微电子学》2022年第5期810-815,共6页Microelectronics

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxm3053)。

摘　　要：提出了一种自适应时间常数匹配G_(m)-C电感电流采样方法。该方法通过比较Buck变换器SW点电压的过零时间与G_(m)-C滤波采样电压的过零时间,判断G_(m)-C时间常数是否与DCR时间常数匹配。使用鉴频鉴相器检测二者过零时间差,并控制双向计数器,实现对电容阵列等效容值的调制,最终实现自适应时间常数匹配G_(m)-C电感电流采样。与前序工作相比,该校准过程平滑,并且可以在DC-DC变换器正常工作情况下进行在线调制,能有效适应DC-DC变换器工作中温度、电压、电流等外部条件的变化。An adaptive time constant matching G_(m)-C inductor current sensing method is proposed. By comparing the zero-crossing time difference between the SW voltage of buck converter and the G_(m)-C filtering sensing voltage, the control loop determined whether the G_(m)-C time constant matched the DCR time constant. A phase/frequency detector was adopted to detect the time difference. The phase/frequency detector also controlled the reversible counter to calibrate the equivalent capacitance of the capacitor array. Finally, the adaptive time constant matching G_(m)-C inductor current sensing was implemented. Compared with previous works, the calibration process is smooth, and the DC-DC converter can be modulated online under the normal working condition, which can effectively adapt to the change of external conditions, such as temperature, voltage and current, in the operation of the DC-DC converter.

关 键 词：自适应时间常数匹配 G_(m)-C电感电流采样 BUCK变换器 

分 类 号：TN86[电子电信—信息与通信工程] TN433