Abstract
Various types of clamp-on current sensor have long been in use, because they are so easy to handle. Recently, power instruments such as inverters have become widely used and clamp-on sensors have been adopted in industry. Current sensors should have the high-performance characteristics of a wide frequency band, a wide measuring range, and high accuracy.
In this paper, We use FEM to calculate magnetic flux of an ac/dc zero-flux current sensor equipped with a Hall element, and analyze the operational mechanism. The analytical results agree well with experimental data. The clamp-on current sensor that we developed has a wide operating range of frequency from dc to 1 MHz, as well as high accuracy of with in ±0.5%.
