Development of high DC-current measurement system using closed loop Hall Effect configuration

摘要

Recently, the requirement of high-power electric sources for the vehicle industry has been increased, this trend forces the research of DC power sources and storage to be developed faster. For supporting the development, the requirement of the robust measurement system cannot be avoided. In this paper, non-contact high DC-current measurement system had been developed using Hall effect sensing. By this principle, a wide range of current magnitude spanning from -169 A to 237 A with 0.25 A resolution by design was developed. The design of the instrument was extended from the conventional closed-loop configuration system. The magnetic field obtained from secondary current was used to "purify" offset voltage and by using absolute voltage subtractor, the offset voltage can be removed. By this approach, the error due to permanent magnetic fields of concentrator can be compensated. The sensor and the conditioning signal were coupled with the digital block and the measurement data can be observed from LCD and connected to the PC by interface software.