Abstract
This paper describes a three–phase electric current sensor using a magneto–impedance (MI) sensor, which provides compact size and wide–range current sensing. The MI sensor is composed of a thin–film MI element and a bias coil. The MI sensors and electric current bars are placed in u–shaped cores to prevent an unwanted magnetic field from being generated by another phase current. To realize a high shielding performance and a compact size, a double shielding structure is employed. Two kinds of alternate bias are used in the system to implement a wide measurement range of 1:600. The sensor is intermittently driven by discrete sampling to realize a low power consumption of 20 mW. The influence of temperature on the MI sensor is alleviated by supplying an optimum carrier electric current. As a result, a temperature fluctuation ratio of less than ± 1.3% at -25 to 60°C was obtained.
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