Closed Loop Hall Current Sensor

A closed loop Hall effect current sensor is a more sophisticated type of current sensor that overcomes many of the limitations of its open loop counterpart.

How a Closed Loop Hall Current Sensor Works:

1. Magnetic Field Detection: Like the open loop sensor, it uses a Hall-effect sensor to detect the magnetic field generated by the current flowing through a conductor.
2. Feedback Mechanism: The key difference lies in the inclusion of a feedback loop. The output signal from the Hall sensor is amplified and used to drive a compensating coil.
3. Magnetic Field Cancellation: This compensating coil generates a magnetic field that opposes the magnetic field produced by the primary current.
4. Zero-Flux Condition: The system actively adjusts the current flowing through the compensating coil until the net magnetic field in the core is minimized (ideally brought to zero).

Key Advantages:

• Improved Accuracy: Minimizes the influence of external magnetic fields and temperature variations.
• Enhanced Linearity: Provides a highly linear output signal over a wide current range.
• Reduced Temperature Drift: Minimizes the impact of temperature changes on sensor performance.
• High Precision: Achieves higher accuracy and precision compared to open-loop sensors.

Applications:

• High-Precision Applications: Used in applications where high accuracy and precision are critical, such as in precision motor control, power quality monitoring, and scientific instrumentation.
• Industrial Automation: Employed in demanding industrial environments where accuracy and reliability are paramount.
• Renewable Energy Systems: Used in solar inverters, wind turbines, and other renewable energy systems for precise power monitoring and control.

In summary:

Closed loop Hall effect current sensors offer significant advantages over their open-loop counterparts by incorporating a feedback mechanism to actively compensate for external influences and improve overall performance. This makes them suitable for a wide range of applications where high accuracy and reliability are essential.