| 一种自适应时间常数匹配Gm-C电感电流采样方法 |
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| 引用本文： | 杨涛,甄少伟,蒋沈昊,程雨凡,齐钊,周春华,罗萍,张波.一种自适应时间常数匹配Gm-C电感电流采样方法[J].微电子学,2022,52(5):810-815. |
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| 作者姓名： | 杨涛 甄少伟 蒋沈昊 程雨凡 齐钊 周春华 罗萍 张波 |
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| 作者单位： | 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 ;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 ;电子科技大学 重庆微电子产业技术研究院, 重庆 401331 |
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| 基金项目： | 重庆市自然科学基金面上项目(cstc2021jcyj-msxm3053) |
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| 摘 要： | 提出了一种自适应时间常数匹配Gm-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Gm-C滤波采样电压的过零时间，判断Gm-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Gm-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。
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| 关 键 词： | 自适应时间常数匹配 Gm-C电感电流采样 Buck变换器 |
| 收稿时间： | 2022/1/13 0:00:00 |
An Adaptive Time Constant Matching Gm-C Inductor Current Sensing Method |
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| YANG Tao,ZHEN Shaowei,JIANG Shenhao,CHENG Yufan,QI Zhao,ZHOU Chunhu,LUO Ping,ZHANG Bo.An Adaptive Time Constant Matching Gm-C Inductor Current Sensing Method[J].Microelectronics,2022,52(5):810-815. |
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| Authors: | YANG Tao ZHEN Shaowei JIANG Shenhao CHENG Yufan QI Zhao ZHOU Chunhu LUO Ping ZHANG Bo |
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| Affiliation: | State Key Lab.of Elec.Thin Films and Integr.Dev., Univ.of Elec.Sci.and Technol.of China, Chengdu 610054, P.R.China;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 |
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| Abstract: | An adaptive time constant matching Gm-C inductor current sensing method is proposed. By comparing the zero-crossing time difference between the SW voltage of buck converter and the Gm-C filtering sensing voltage, the control loop determined whether the Gm-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 Gm-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. |
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| Keywords: | adaptive time constant matching Gm-C inductor current sensing buck converter |
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