An open loop Hall effect current sensor is a type of current sensor that directly measures the magnetic field generated by the current flowing through a conductor.

Here’s How a Open Loop Hall Current Sensor Works:

Current Flow: When current flows through the conductor, it generates a magnetic field around it.
Magnetic Field Detection: A Hall effect sensor, positioned near the conductor, detects the strength of this magnetic field.
Voltage Output: The Hall-effect sensor produces a voltage output that is proportional to the strength of the magnetic field, and consequently, proportional to the current flowing through the conductor.

Key Characteristics:

Simple Construction: Relatively simple and inexpensive to manufacture.
Non-Invasive Measurement: Does not require breaking the circuit to measure current.
Good Bandwidth: Can accurately measure both DC and AC currents.
Susceptible to External Magnetic Interference: External magnetic fields can affect the sensor’s accuracy.
Temperature Sensitivity: The output of the sensor can be affected by temperature variations.

Applications:

Motor Control: Monitoring motor currents in industrial drives and automotive applications.
Battery Management Systems (BMS): Measuring battery current in electric vehicles and energy storage systems.
Overcurrent Protection: Detecting and responding to overcurrent conditions in electrical circuits.
Power Monitoring: Measuring power consumption in various applications.

Limitations:

Accuracy can be affected by external magnetic fields and temperature variations.
May require additional signal conditioning circuitry to improve accuracy and compensate for environmental factors.

Despite these limitations, open loop Hall effect current sensors offer a cost-effective and practical solution for many current sensing applications due to their simplicity and ease of use.