一种低功耗电流/频率转换电路零偏补偿方法  

A zero offset compensation method for low power current/frequency conversion circuit

作　　者：汪金华[1] 游超 庄永河[1] 杨杨 李鸿高[1] 吴向东[1] Wang Jinhua;You Chao;Zhuang Yonghe;Yang Yang;Li Honggao;Wu Xiangdong(Anhui Province Key Laboratory of Micro System,The 43rd Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第四十三研究所微系统安徽省重点实验室,安徽合肥230088

出　　处：《电子技术应用》2023年第7期130-133,共4页Application of Electronic Technique

摘　　要：电流/频率转换电路主要用于惯导领域中加速度计输出电流测量,目前典型电流/频率转换电路功耗较大,限制了其应用范围。通常采用分流电路进行低功耗电流/频率转换电路设计,但该方式会带来较大零偏误差,影响电路测量精度。对此分析了影响低功耗电流/频率转换电路零偏的原因,提出了一种利用单片机实现零偏补偿的方法,其只需多次烧录程序就可实现迭代补偿,通过对三个典型温度点粗补偿和全温度段精补偿,较便捷地实现了高精度零偏补偿。经过试验验证,设计的产品全温零偏小于0.15 Hz,功耗为典型电路的1/5,具有较高的工程应用价值和良好的市场前景。The current/frequency conversion circuit is mainly used to measure the output current of accelerometers in inertial navigation system,and at present the typical current frequency conversion circuit consumes so much power,which limits its application scope.Shunt circuit is usually used to design low power current/frequency circuit,however this method will bring large zero bias error,which affects the accuracy of circuit measurement.The reasons that affect the zero bias of low power current frequency conversion circuit are analyzed,and a method to realize zero offset compensation by single chip microcomputer is presented,it only needs to load the program several times to realize iterative compensation,through coarse compensation for three typical temperature points and fine compensation for the whole temperature range,and it is convenient to realize high-precision zero offset compensation.The experiments show the zero offset of the designed product at whole temperature is less than 0.15 Hz,and the power consumption is 1/5 of that of typical circuit,which has high engineering application value and good market prospect.

关 键 词：电流/频率转换 低功耗 单片机 零偏补偿 

分 类 号：U666.12[交通运输工程—船舶及航道工程]