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Open Loop Hall Effect Current Sensors/Transducers

1. Measuring Principle


  • Primary current Ip applied on core, causing Hall voltage rise thanks to the magnetic induction generated on core.
  • Ic is a constant current source to supply Hall sensor. It makes Hall sensor under constant operation condition.
  • Output voltage Vo then is proportional to Ip. This means that the output can get a very good linearity before core and OP saturation.
 
 
3. Dynamic Properties
 
a. Response time

  • Definition:
    The delay time between 90% of measurable current range (3 times of rated current) and sensor output reaches the coordinated voltage

  • specification:
    BB Automacao open loop current sensors have the Best performance thanks to our best design of layout and well selection of high slew Rate amplifier.
  
b. Noise response

  • Voltage pulse applied 300~600V/µs on primary conductor
  • With control power supply
  • Measuring output voltage (Vo), specification depends on the application situation. However the smaller, the better
  • BB Automacao open loop current sensors have the excellent low output voltage (Vo) in comparison with other sensors.
  
c. Output voltage (Vo) linearity:
  • The output voltage versus input current relation of an ideal current sensor (without setting error in residual and output voltage) is indicated by the dot line in right figure
  • The continuous line shows the output/input relation of an actual sensors.
 
 
2. Characteristics and Features
 
Measurable Current Range: About 3 times of rated current
Output Signal:



 It is directly proportional to the measured current, both DC and AC measurable. General voltage output Vo is 4V at the rated (nominal) current Irated. Different Vo versions are also available
Measurement Accuracy:


 Depends on ambient temperature, operating temperature and some other electrical parameters. Our current sensors are factory-calibrated (offset and gain voltage) at an ambient temperature of 25°C
 
4. Output Voltage (Vo) Performance (at Rated Current 50A)
  • Offset standard specification:40mV

  • Output voltage(Vo) standard specification: ±4V ±0.04V
  
 
5. Typical Applications
  • General Purpose Inverter
  • AC/DC Variable Speed Drivers
  • Battery Supplied Applications
  • Uninterruptible Power Supplies
  • Switched Mode Power Supplies
 

 

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