Differential Magnetic Current Sensing With L-Shaped Conductor Layout
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Solution Overview
Problem
Existing current measurement technologies face challenges in achieving robustness against stray fields, particularly when using straight planar conductors, due to the difficulty in positioning differential magnetic field sensors to detect maximum magnetic fields while maintaining sufficient distance for effective differential measurement, leading to reduced sensitivity and precision.
Innovation Solution
A device with a current conductor having a first section extending in one plane and a second section perpendicular to it, combined with a differential magnetic field sensor featuring two sensor elements at different distances from the conductor end, allowing for targeted detection of magnetic fields and minimizing the influence of external fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two sensor elements are positioned close to the conductor to detect maximum magnetic field, then measurement sensitivity is improved, but it becomes difficult to place and mount the sensor elements symmetrically without them affecting each other
Solution Approach 1:
The patent transitions from planar 2D sensor arrangement to 3D spatial arrangement by bending the conductor into an L-shape with perpendicular sections. This allows sensor elements to be positioned at different distances from the conductor end in three-dimensional space, enabling both close proximity for high sensitivity and sufficient separation for independent mounting.
Solution Approach 2:
The conductor is segmented into multiple sections (first conductor section and second conductor section perpendicular to it), allowing the magnetic field detection to be distributed across different spatial locations. This segmentation enables the sensor elements to be placed at optimized positions without mutual interference.
2Ease of operation
If sensor elements are positioned further away from the conductor to maintain sufficient distance for differential measurement, then ease of placement is improved, but field strength decreases and measurement sensitivity is reduced
Solution Approach 1:
By utilizing the third dimension through perpendicular conductor sections, the patent enables sensor elements to achieve optimal distance for differential measurement while maintaining close proximity to the current path, thus preserving field strength and sensitivity.
Solution Approach 2:
The patent employs asymmetric positioning of sensor elements at different distances from the conductor end (first distance and second distance), which is enabled by the L-shaped conductor geometry. This asymmetric arrangement optimizes the differential measurement while maintaining ease of placement.
3Ease of manufacture
If a straight planar conductor is used with differential sensor, then manufacturing simplicity is maintained, but the sensor cannot effectively detect maximum field while maintaining distance for differential measurement
Solution Approach 1:
The patent introduces curvature by bending the conductor into an L-shape with perpendicular sections instead of using a straight planar conductor. This geometric modification enables the sensor elements to be positioned at different distances from the conductor end, achieving both maximum field detection and effective differential measurement.
Solution Approach 2:
The conductor geometry transitions from 2D planar to 3D spatial arrangement with perpendicular sections, allowing sensor elements to be positioned in three-dimensional space for optimized differential measurement while maintaining manufacturing feasibility.
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 solution enhances the accuracy and robustness of current measurement by canceling out the effect of uniform external magnetic fields, thereby improving sensitivity and precision.
Implementation Method 1
a magnetic field sensor arranged parallel to the plane, having a first sensor element and a second sensor element
Implementation Method 2
the first sensor element is at a first distance from the end of the first conductor section and the second sensor element is at a second distance from the end of the first conductor section
Data Source
AI summary
A device for measuring current is proposed, including a current conductor having a first conductor section extending in one plane, and having a second conductor section adjoining end of the first conductor section and extending perpendicular to the plane, a differential magnetic field sensor arranged parallel to the plane, having a first sensor element and a second sensor element, wherein the first sensor element is at a first distance from the end of the first conductor section and the second sensor element is at a second distance from the end of the first conductor section.