Mini Current Sensor With Hall Array Noise Cancellation
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Solution Overview
Problem
Current Hall effect current sensing systems face challenges in accuracy due to external magnetic noise and require bulky, heavy components, which are impractical for compact and high-noise environments.
Innovation Solution
A nonintrusive current measurement system using a U-shaped mechanical structure with multiple Hall effect sensors to detect and cancel out external magnetic noise, improving accuracy and reducing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Hall effect devices are used for noninvasive current measurement, then physical contact with the circuit is eliminated, but susceptibility to interference from other magnetic fields increases
Solution Approach 1:
The patent introduces a compensating conductor that generates a magnetic field opposite to the interfering magnetic field. By controlling current flow through this conductor, the system converts the harmful magnetic interference into a beneficial cancellation effect, reducing net interference at the Hall effect device location.
Solution Approach 2:
The compensating conductor acts as an intermediary element between the interfering magnetic field source and the Hall effect device. It mediates the magnetic field interaction by generating counteracting fields, thereby protecting the measurement system from interference without requiring direct modification of the primary circuit.
2Measurement precision
If current shunts are used for current measurement, then direct current measurement is achieved, but the shunt terminals become bulky and heavy due to heat dissipation requirements
Solution Approach 1:
The patent extracts the heat dissipation function from the measurement terminals by using separate compensating conductors for interference cancellation. This allows the main shunt terminals to be smaller and lighter since they only need to handle measurement currents, while the compensating conductors handle the interference cancellation independently.
Solution Approach 2:
The system segments the functions of current measurement and interference cancellation into separate components: the main shunt for measurement and compensating conductors for interference management. This functional segmentation allows optimization of each component's size and weight for its specific purpose.
3Measurement precision
If multiple Hall effect sensors are used to cancel external magnetic noise, then measurement accuracy in noisy environments improves, but device complexity increases
Solution Approach 1:
The patent merges the compensating conductor system with the existing circuit structure, integrating interference cancellation functionality into the circuit design rather than adding separate complex shielding systems. This reduces overall device complexity while maintaining measurement accuracy.
Solution Approach 2:
The system changes the operational parameters by introducing controlled current flows through compensating conductors that can be dynamically adjusted based on detected interference levels. This allows adaptive interference cancellation without requiring complex fixed-structure shielding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate current measurements in magnetically noisy environments by effectively canceling out noise, making it suitable for applications like aircraft power distribution systems, while minimizing the size and weight of the measurement device.
Implementation Method 1
DC currents may be measured by a Hall effect device
Implementation Method 2
A nonintrusive current measurement system using a U-shaped mechanical structure with multiple Hall effect sensors to detect and cancel out external magnetic noise
Implementation Method 3
The movement of charge through a conductor also produces a magnetic field or force about the conductor
Data Source
AI summary
An electric current measuring device that employs a unique mechanical structure and Hall effect sensor array combined with processing of measurements obtained from the current measuring device to accurately measure current flow by cancelling the effects of static or dynamic magnetic noise originating from external sources. The process determines the actual current through the conductor by measuring and subtracting external noise.