Current Sensor Magnetic Field Detection
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Solution Overview
Problem
Current sensors face reduced sensitivity and increased variation in measurement values due to external magnetic fields, primarily because the magnetic sensors are exposed to weaker magnetic fields and have longer distances between them, leading to decreased output and accuracy.
Innovation Solution
A current sensor design featuring a conductor with specific configurations, including a first and second conductor portion and a third conductor portion, where magnetic sensors are positioned closer to the conductor portions to enhance magnetic field detection, and a calculator performs arithmetic operations on the detected magnetic field values to calculate the current, thereby increasing sensitivity and reducing external magnetic field influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conductor is branched to multiple conductor portions, then the current sensor can detect magnetic fields from different current paths, but the strength of the magnetic field applied to the magnetic sensor is reduced and the sensitivity of the current sensor decreases
Solution Approach 1:
The patent introduces a third conductor portion positioned at one side of the height direction with respect to the first and second conductor portions, adding a vertical dimension to the conductor arrangement. This three-dimensional configuration allows magnetic sensors to detect magnetic fields from multiple spatial dimensions, maintaining high sensitivity while accommodating multi-path current detection.
Solution Approach 2:
The conductor is divided into multiple conductor portions (first, second, and third) that are spatially separated and positioned at different locations. Each conductor portion can carry current independently, allowing the system to detect magnetic fields from different current paths while maintaining strong magnetic field signals at each detection point.
2Ease of operation
If the distance between the first magnetic sensor and the second magnetic sensor is increased, then the conductor can be properly positioned between them, but the variation in the measurement value caused by the external magnetic field is increased
Solution Approach 1:
The patent positions the third conductor portion at one side of the height direction, creating a compact three-dimensional arrangement. This vertical positioning allows the first and second magnetic sensors to be placed closer together in the horizontal plane, reducing the distance between them and minimizing measurement variation from external magnetic fields while still allowing proper conductor positioning.
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 design achieves higher sensitivity to the magnetic field generated by the current while minimizing the impact of external magnetic fields, resulting in more accurate and stable measurement values.
Implementation Method 1
a first magnetic sensor and a second magnetic sensor that detect a strength of a magnetic field generated by the current
Data Source
AI summary
A current sensor includes a conductor through which current to be measured flows and which has dimensions in a length direction, a width direction, and a height direction, and first and second magnetic sensors that detect the strength of a magnetic field generated by the current. Each of the first and second magnetic sensors is positioned in an area between first and second conductor portions in the width direction and an area extending from one end to the other end in the height direction of the first and second conductor portions.