Analysis of Constant-Current Characteristics for Current Sources

摘要：

A current source is one of the most important circuits in Electrical Impedance Tomography (EIT) hardware systems for measuring conductive multiphase flows. One of its important and challenging features is to deliver a relatively large and constant current for a wide range of resistive loads, high signal to noise ratio, and a large bandwidth. To resolve this problem, three different current sources are discussed and compared. They are the Howland current source, an enhanced Howland current source and a dual op-amp current source. The constant-current characteristics is analyzed and compared in circuit principle. Simulation and experimental results show that the enhanced Howland is most stable among the three current sources when the frequency or load changes. Initial tests have proven the feasibility of EIT system with the enhanced Howland current source.

关键词： Current Source Constant-Current Characteristics Electrical Impedance Tomography

作者: LI Xiaoke DONG Feng FU Yan

作者单位: Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Auto Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Auto

会议类型: 国际会议

会议名称: The 24th Chinese Control and Decision Conference (第24届中国控制与决策学术年会 2012 CCDC)

会议地点: 太原

会议语种:英文

页码: 2619-2624

在线出版日期: 2012-05-23（万方平台首次上网日期，不代表论文的发表时间）