用于压磁传感器的精密程控恒流源设计  

Design of High-precision Program-controlled Constant-current Source Used for Piezomagnetic Sensors

作　　者：蒋周翔[1,2] 王成虎[2] 王成彪[1] 贾龙[1,2] 

机构地区：[1]中国地质大学工程技术学院,北京100083 [2]中国地震局地壳应力研究所,北京100085

出　　处：《现代电子技术》2010年第24期171-172,共2页Modern Electronics Technique

基　　金：中央级公益性科研院所基本科研业务费专项资金资助项目(ZDJ2009-5);国家自然科学基金青年基金项目(40704018)

摘　　要：目前很多由分立元件构成的恒流源电流有限,稳定度较差,容易受到元器件参数变化和环境变化的干扰,并难以调节。在此采用闭环控制原理,利用单片机控制ADC和DAC转换模块,达到恒流的目的,并可以根据需要,通过代码改写实现电流的预置。克服了以往分立元件构成的恒流源不稳定的缺点,在实际应用中,达到了良好的供电效果,在多次实地测量中圆满完成任务。Many available constant-current sources composed of discrete components have defects which cause the current limitation,poor stability,is vulnerable to the change of environment and component parameters,and difficult to adjust.The closed-loop control principle is adopted in this design.The purpose of constant-flow is achieved with ADC and DAC conversion modules controlled by SCM.If needed,the current preset can be realized by rewriting the code.This design has overcome the shortcomings of the previous constant-current sources which is consisted of discrete components and is unstable.In practice,the power supply of this constant-current source has achieved good results in the numerous field measurements.

关 键 词：程控恒流源 电路设计 应力测量 压磁传感器 

分 类 号：TN919-34[电子电信—通信与信息系统]