Hall-Effect Based Current Sensors <ul><li>Source: Allegro Microsystems </li></ul>
Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce basic knowledge of Hall-effect sensors, and Allegro ACS cu...
Hall-Effect Basics Semiconductor material B = flux density d = plate thickness e = electron charge n = charge carrier dens...
Hall-Effect Sensor ICs <ul><li>Linear output Hall-Effect Sensor ICs </li></ul><ul><ul><li>An amplifier and voltage regulat...
Hall-Effect Current Sensors <ul><li>Hall-effect sensor ICs are superb devices for ‘open-loop’ current-sensing designs. </l...
Current Sensing for Energy Efficient Markets <ul><li>The prime applications for cost-effective Hall-effect sensors for cur...
ACS71x Current Sensor ICs <ul><li>Measurement range up to  ± 20A </li></ul><ul><li>SOIC8 with integrated 1.2m Ω  conductor...
ACS75x Current Sensor ICs <ul><li>Measurement range up to 200A </li></ul><ul><li>Small physical size </li></ul><ul><li>100...
Block Diagram Hall element
Chopper Stabilization Technique <ul><li>Chopper Stabilization minimize the offset voltage of a Hall element and an associa...
Application Example 1 – Battery Monitoring <ul><li>Using a Hall-effect device as a shunt solution provide higher accuracy ...
Application Example 2 – UPS <ul><li>The input and output currents of a UPS are monitored both for protection and to be abl...
Additional Resource <ul><li>For ordering ACS current sensors, please click the part list or </li></ul><ul><li>Call our sal...
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Hall-Effect Based Current Sensors

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

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Hall-Effect Based Current Sensors

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

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