基于STM32和电容积分法的微电流测量仪设计  

Design of Weak Current Measurement with Capacitor-integration Based on STM32

作　　者：蒿书利[1] 庹先国[2] 王洪辉[2] 奚大顺[2] 张贵宇[1] 

机构地区：[1]成都理工大学信息科学与技术学院,成都610059 [2]成都理工大学成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《电测与仪表》2012年第8期84-88,共5页Electrical Measurement & Instrumentation

基　　金：国家杰出青年科学基金资助项目(41025015);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2009Z007);四川省科技支撑计划资助项目(2011SZ0182);成都市科技计划资助项目(10GGYB323GX-023)

摘　　要：基于电容积分法测量原理，利用32位微控制器STM32F103控制双通道双切换积分（Dual Switched Integrator）芯片DDC112，配合电路防泄漏电流工艺设计，实现双通道fA（飞安10^-15A）级微弱电流的连续测量。利用单芯片DDC112实现I/V转换，并提供20位数字输出，使系统具有电路简化，分辨率高，干扰噪声低等特点。该系统测量分辨率达到1fA，测量时间范围：50～1×10^6 us，电流量程可在5×10^4-7×10^9fA范围内通过设置积分时间进行选择。Based on the capacitor-integration measurement method, control the dual channel and dual switched integrated chip DDC112. leakage current, it realized double channel fA （fei ampere 10 the STM32 series microcontroller was used to Coordinate with the process design for Anti- 15 A） level of the current weak consecutive measurements. By using a single chip DDC112 to realize I/V switching and providing 20 digital output, the system is with simplified circuit, high resolution, low noise interference characteristics. The system measurement resolution achieves lfA measuring time range is 50-1×10^6 us , and current range can be set up in the range of 5×10^4 -7×10^9 fA by setting the integral time.

关 键 词：电容积分法 STM32 DDC112 飞安电流 

分 类 号：TM933.1[电气工程—电力电子与电力传动] TP272[自动化与计算机技术—检测技术与自动化装置]