功率MOS开关的高精度电流检测电路设计  

Design of high precision current sense circuit for power MOS switch

作　　者：张元皓 刘清惓[1,2] 刘祖韬 赵自强 ZHANG Yuan-hao;LIU Qing-quan;LIU Zu-tao;ZHAO Zi-qiang(Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学,江苏省大气环境与装备技术协同创新中心,南京210044 [2]南京信息工程大学,江苏省气象探测与信息处理重点实验室,南京210044

出　　处：《信息技术》2024年第7期9-14,19,共7页Information Technology

基　　金：江苏省研究生科研与实践创新计划项目(SJCX21_0353);江苏省高等学校大学生创新创业训练计划项目(202110300063Y);国家自然科学基金面上项目(418-75035,42275143)。

摘　　要：随着军工设备、工业控制、智能汽车等领域的发展,功率MOS开关驱动器的需求量不断提升,其可靠性、安全性等性能要求也在逐步提高。为保证功率MOS管在安全电流下工作,设计了一款高精度高边电流检测电路。利用复合式斩波放大器,大幅降低失调电压对电流采样精度的影响,并保证电路系统有足够的响应速度。该电路采用CSMC 0.18μm高压BCD工艺进行设计,在添加10mV的输入失调电压后,测量精度依然可以达到99%,带宽达到3MHz。With the development of military equipment,industrial control,intelligent vehicles and other fields,the demand for power MOS switch driver is increasing,and their reliability,safety and other performance requirements are also gradually improving.In order to ensure the power MOS transistor to work under safe current,a high-precision high side current detection circuit is designed.By using the compound chopper amplifier,the influence of offset voltage on current sampling accuracy is greatly reduced,and the circuit system has sufficient response speed.The circuit is designed with CSMC 0.18μm high-voltage BCD process.After adding 10mV input offset voltage,the measurement accuracy can still reach 99%,and the bandwidth can reach 3MHz.

关 键 词：MOS开关 电流检测 斩波放大器 失调电压 高精度 

分 类 号：TN433[电子电信—微电子学与固体电子学]