Summary of Current monitor uses Hall sensor
Parts used in the DC Current Monitor:
- Hall-effect sensor IC
- Flux-collector toroid
- Current-carrying wire
- Regulator IC1
- Regulator IC2
- Current sensor CS1
The Fig 1 circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector toroid, to measure dc current in the range of 0 to 40A. You wrap the current-carrying wire through the toroid; the Hall voltage VH is then linearly proportional to the current (I). The current drain from VB is less than 30 mA.
o monitor an automobile alternator’s output current, for example, connect the car’s battery between the circuit’s VB terminal and ground, and wrap one turn of wire through the toroid. (Or, you could wrap 10 turns—if they’d fit—to measure 1A full scale.) When I=0V, the current sensor’s (CS1’s) VH output equals one-half of its 10V bias voltage. Because regulators IC1 and IC2 provide a bipolar bias voltage, VH and VOUT are zero when I is zero; you can then adjust the output gain and offset to scale VOUT at 1V per 10A
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For More Details: Current monitor uses Hall sensor
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How does the Hall-effect sensor measure current?
The Hall voltage VH is linearly proportional to the current I when the current-carrying wire is wrapped through the toroid. -
What is the measurement range of this circuit?
The circuit measures dc current in the range of 0 to 40A. -
Can the sensitivity be adjusted by changing wire turns?
Yes, wrapping 10 turns instead of one allows measuring a full scale of 1A if they fit in the toroid. -
How are the output gain and offset scaled?
The output is scaled to VOUT at 1V per 10A after adjusting for zero current conditions where VH and VOUT are zero. -
What power supply configuration is used for biasing?
Regulators IC1 and IC2 provide a bipolar bias voltage to ensure VH and VOUT are zero when I is zero. -
What is the current drain from the VB terminal?
The current drain from VB is less than 30 mA. -
How can this circuit monitor an automobile alternator?
Connect the car battery between the VB terminal and ground, and wrap one turn of wire through the toroid.
