电子元件与材料2026，Vol.45Issue(8)：930-936,7.DOI:10.14106/j.cnki.1001-2028.2026.0045
一种可防倒灌电流的高精度电流检测放大器
A high-precision current-sense amplifier with reverse-current protection
摘要
Abstract
Current-sense amplifiers are widely used in motor control,battery management,and energy monitoring applications,where gain accuracy directly affects the precision of current measurement results.Conventional current-sense amplifiers suffer from significant gain error due to process variations in the input-stage resistors,making it difficult to meet high-precision measurement requirements.The traditional gate-source protection circuit for output transistors employs a Zener diode clamping structure,which is prone to generating reverse current when the output voltage becomes excessively high,potentially damaging the chip.To address the above issues,this paper proposed a high-precision current-sense amplifier with reverse current prevention.A post-package fuse trimming technique was adopted to calibrate the input-stage resistors,thereby eliminating gain error induced by process variations.Furthermore,a novel output transistor gate-source protection circuit was designed,which not only clamped the gate-source voltage of the output transistor but also suppressed the generation of reverse current.Simulation results show that,under the conditions of a supply voltage of 5 V,a common-mode input voltage of 12 V,a differential-mode input voltage of 100 mV,and a load resistance of 1 kΩ,the gain error of the system for current measurement does not exceed 0.12%.关键词
电流检测/保护电路/高精度/增益误差/熔丝校准Key words
current sense/protection circuit/high-precision/gain errors/fuse trimming分类
信息技术与安全科学引用本文复制引用
刘辉,邓红辉,王子贤,吴英民,尹勇生..一种可防倒灌电流的高精度电流检测放大器[J].电子元件与材料,2026,45(8):930-936,7.基金项目
企业合作项目(W2023JSKF0003) （W2023JSKF0003）
