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Hall-Effect Based Current Sensors
 

Hall-Effect Based Current Sensors

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To introduce basic knowledge of Hall-effect sensors, and Allegro ACS current sensor IC family

To introduce basic knowledge of Hall-effect sensors, and Allegro ACS current sensor IC family

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    Hall-Effect Based Current Sensors Hall-Effect Based Current Sensors Presentation Transcript

    • Hall-Effect Based Current Sensors
      • Source: Allegro Microsystems
    • Introduction
      • Purpose
        • To introduce basic knowledge of Hall-effect sensors, and Allegro ACS current sensor IC family
      • Outline
        • Hall-Effect sensors basics
        • Hall-effect based current sensing technology
        • ACS current sensor family
        • ACS application examples
      • Content
        • 13 pages
    • Hall-Effect Basics Semiconductor material B = flux density d = plate thickness e = electron charge n = charge carrier density VH = -(I • B) / (d • e • n)
    • Hall-Effect Sensor ICs
      • Linear output Hall-Effect Sensor ICs
        • An amplifier and voltage regulator are used to improve the sensor’s output and allow it to operate over a wide range of supply voltage.
      • Digital output Hall-Effect switches
        • A Schmitt-trigger threshold detector and an open-collector NPN transistor gives the Hall-effect circuit digital output capabilities
      Analog Output Sensor Digital Output Switch
    • Hall-Effect Current Sensors
      • Hall-effect sensor ICs are superb devices for ‘open-loop’ current-sensing designs.
      • The magnetic field generated by the current is sensed by the integrated Hall IC and converted into a proportional voltage.
      High Current Applications Low Current Applications
    • Current Sensing for Energy Efficient Markets
      • The prime applications for cost-effective Hall-effect sensors for current sensing include:
        • Current Imbalance
        • Current Monitoring
        • Operator/User Safety and Security
        • Overcurrent Detection/System Protection
        • System Diagnosis and Fault Detection
        • Test and Measurement
      Energy Efficient Appliances and Motor Control Hybrid Vehicle Renewable Energy Inverters / Metering
    • ACS71x Current Sensor ICs
      • Measurement range up to ± 20A
      • SOIC8 with integrated 1.2m Ω conductor
      • Isolation for line power applications
      • <4% typical error over -40 to 150ºC range
      • Low noise, 80 KHz bandwidth current sensor
      • Integrated shield reduces output spiking in high dV/dt applications
      Noise management Current path
    • ACS75x Current Sensor ICs
      • Measurement range up to 200A
      • Small physical size
      • 100 µ Ω integrated conductor, galvanic isolation for line powered system
      • Enhanced accuracy, typically < 4% total error from -40 to 150ºC range
      • Low noise, > 100KHz bandwidth sensor IC
      • Integrated shield reduces output spiking in high dV/Dt applications
    • Block Diagram Hall element
    • Chopper Stabilization Technique
      • Chopper Stabilization minimize the offset voltage of a Hall element and an associated on-chip amplifier.
        • This offset reduction technique is based on a signal modulation-demodulation process.
        • A low-pass filter suppresses the modulated DC offset while the magnetically induced signal passes through the filter.
        • The anti-aliasing filter prevents aliasing from happening in applications with high frequency signal components.
    • Application Example 1 – Battery Monitoring
      • Using a Hall-effect device as a shunt solution provide higher accuracy for lower charge and discharge currents;
      • This solution also provides more signal over the measurement range.
    • Application Example 2 – UPS
      • The input and output currents of a UPS are monitored both for protection and to be able to show the battery state of charge with a level of confidence.
    • Additional Resource
      • For ordering ACS current sensors, please click the part list or
      • Call our sales hotline
      • For more product information go to
        • http://www.allegromicro.com/en/Products/Categories/Sensors/currentsensor.asp
      • Visit Element 14 to post your question
        • www.element-14.com
      • For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility
      Newark Farnell