Magnetic Permeable Member for Wide Range Current Detection
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Solution Overview
Problem
Current current detection devices require multiple Hall elements with different properties to detect a wide range of currents, increasing component diversity and cost, and struggle to effectively adjust detection ranges by simply changing the distance between the Hall element and the electromagnetic shield frame.
Innovation Solution
A magnetic permeable member with a C-shaped or O-shaped cross section configuration, featuring a closed and opened portion, is used to concentrate magnetic flux in the closed portion for strong field detection of small currents and reduce flux in the opened portion for large current detection, allowing common magnetic field detection elements to cover a wide current range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple Hall elements with different properties are used to detect a wide range of currents, then the detectable current range is improved, but the device complexity and cost increase
Solution Approach 1:
The magnetic permeable member is divided into multiple regions with different magnetic flux characteristics. The first region has higher magnetic flux density for detecting smaller currents, while the second region has lower magnetic flux density for detecting larger currents. This segmentation allows a single Hall element to detect a wide current range by selecting appropriate regions based on current magnitude.
Solution Approach 2:
Different regions of the magnetic permeable member are designed with different local magnetic properties. The first region is positioned to provide stronger magnetic flux concentration for small current detection, while the second region provides weaker flux for large current detection. This local quality variation enables one Hall element to cover multiple current ranges.
2Adaptability or versatility
If the distance between the Hall element and the electromagnetic shield frame is adjusted to change detection range, then the detectable current range is improved, but the manufacturing precision and detection accuracy deteriorate
Solution Approach 1:
Instead of adjusting distance, the magnetic permeable member is segmented into regions with predetermined magnetic flux characteristics. Each region is designed to provide appropriate flux density for specific current ranges, eliminating the need for precise distance adjustment and reducing sensitivity to positional variations.
Solution Approach 2:
The magnetic flux density parameter is changed by selecting different regions of the magnetic permeable member rather than changing the physical distance. This parameter change approach through region selection maintains manufacturing simplicity and reduces sensitivity to assembly tolerances.
3Device complexity
If a single Hall element is used to detect wide range currents, then the cost is reduced, but the measurement precision deteriorates due to magnetic field strength variations
Solution Approach 1:
Different regions of the magnetic permeable member provide different local magnetic flux densities optimized for specific current ranges. The first region provides higher flux density for accurate small current measurement, while the second region provides lower flux density for accurate large current measurement, maintaining precision across the full range.
Solution Approach 2:
The system dynamically selects which region of the magnetic permeable member to use based on the current magnitude. For small currents, the first region is utilized; for large currents, the second region is utilized. This dynamic region selection maintains optimal measurement precision across the entire detectable current range using a single Hall element.
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
This configuration enables the detection of currents across a wide range using common magnetic field detection elements, reducing costs and minimizing detection errors due to positional displacement, while maintaining high detection accuracy.
Implementation Method 1
the closed portion having the C-shaped or O-shaped cross section is configured into a ring-like shape... when a current flows through the bus bar, the magnetic flux is more likely to pass through the closed portion. Consequently, the magnetic flux is likely to concentrate at the closed portion, and thus the magnetic field is likely to be strong inside the closed portion.
Implementation Method 2
a Hall element (magnetic field detection element) is arranged at an appropriate position with respect to the electromagnetic shield frame member to detect the magnetic field using the Hall effect to detect the current flowing through the bus bar
Data Source
AI summary
A magnetic permeable member and a current detection device which can detect current in a wide range by a magnetic field detection element at low cost are provided. A magnetic permeable member includes a closed portion and an opened portion. Thus, when the large current flows through a bus bar, the magnetic field is less likely to be strong at the opened portion, thus the large current is easily detectable by a magnetic field detection element arranged at the opened portion. When the small current flows through the bus bar, the magnetic field is more likely to be strong at the closed portion, thus the small current is easily detectable by a magnetic field detection element arranged at the closed portion. Consequently, the magnetic field detection elements can be commonalized to reduce the cost, while allowing the detection of the current in a wide range.