各向异性磁阻(Anisotropic Magneto Resistive)

anisotropic magnetoresistive sensor


E524.50 Integrated AMR Current Sensor




The E524.50 current sensor family is designed for highly dynamic electronic measurements of DC, AC, or pulsed currents with integrated galvanic isolation. This current sensor based on the an-isotropic magneto-resistive effect (AMR) enables excellent dynamic response without a hysteresis present in designs using iron-cores. The primary current measured needs to be fed below the sensor on PCB or in a current rail, usually a U-shaped conductor defining the magnetic field gradient.
The sensor device includes a high-precision signal conditioner IC providing internal feedback of a sensor compensation current for optimum linearity. The IC-output is an offset calibrated and pre-scaled current which is proportional to the primary current measured. This output is easily converted to a voltage with an external resistor at the post-processing device (usually ADC or amplifier). A precise on-chip voltage reference is provided. Alternatively, an external reference can be used. Total accuracy of a multi-sensor system is improved by sharing one voltage reference for all sensors. A fast overcurrent alarm output allows for immediate reaction to overload events independent of processor and software.

More Information

Features

  • Contactless current measurement based on AMR-effect

  • High precision sensor readout using closed-loop amplifier system

  • High bandwidth measurement: DC to 500kHz

  • Analog current output, used with external feedback resistor for

  • Over-current alarm output with tunable threshold

Applications

  • Power inverters

  • Electrical motor controls

  • Switch mode power supplies

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