Architecture of an Integrated AMR Current Sensor (IACS) System for a Wide Range of Automotive Applications

Abstract

This article describes a new anisotropic-magneto-resistive-effect (AMR) based current sensor system, based on a ‘system-in-a-package’ approach. It is designed for high resolution and fast electronic measurement of DC, AC up to 500 kHz, or pulsed currents [1]. As the concept is based on an external primary current bar, it can easily be adapted to a wide range of applications for different nominal primary current ranges by just altering the geometry of the primary current bar. The major advantages of this system are its high bandwidth and high dynamic range offered by the AMR measurement principle combined with a negligible hysteresis and improved linearity features. The possibility of end-of-line calibration in the application environment at the production site allows for an optimum sensitivity adjustment and improved system accuracy. The integration of the current sensing components within one standard plastic package allows the cost efficient high volume assembly for the customer.