Busbar Recess Layout for Accurate Magnetic Field Sensing
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Solution Overview
Problem
Existing devices for measuring electrically induced magnetic fields around current-carrying conductors face challenges in improving measurement accuracy and reducing disturbances, particularly due to variations in current density and crosstalk between busbars.
Innovation Solution
The sensor device and arrangement feature recesses in the busbar design that increase current density in the region of the magnetic field sensor, align the electrically induced magnetic field orthogonally to the busbar, and use multiple magnetic field sensors for differential measurements to enhance accuracy and reduce disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensors are arranged away from the busbar surface, then measurement accuracy is reduced and disturbances are more easily detected, but placing sensors on the busbar surface improves measurement accuracy while making disturbance detection more difficult
Solution Approach 1:
The busbar is segmented by introducing recesses that divide the surface into distinct regions. These recesses create localized areas with different current densities, allowing the magnetic field sensor to be positioned in a specific region that optimizes both measurement accuracy and disturbance detection capability.
Solution Approach 2:
The recesses create local variations in current density distribution. By positioning the magnetic field sensor within or adjacent to these recesses, the patent achieves enhanced local current density for improved measurement accuracy while maintaining the ability to detect disturbances through the modified local field characteristics.
2Measurement precision
If recesses are introduced to increase current density, then magnetic field detection accuracy improves, but device complexity increases
Solution Approach 1:
The busbar structure is segmented by introducing recesses, which divides the continuous surface into distinct regions. This segmentation creates localized areas of enhanced current density without requiring complex external components, thereby improving measurement accuracy while keeping the overall device structure relatively simple.
Solution Approach 2:
The recesses extend in a direction orthogonal to the main busbar surface, utilizing a third dimension to achieve current density enhancement. This dimensional approach allows the patent to increase current density and improve magnetic field detection without adding lateral complexity to the busbar structure.
3Measurement precision
If multiple magnetic field sensors are used for differential measurements, then measurement accuracy and disturbance rejection improve, but device complexity and cost increase
Solution Approach 1:
The busbar surface is segmented by recesses into multiple distinct regions, which allows for the strategic placement of multiple magnetic field sensors. This segmentation creates spatially separated measurement points that enable differential measurements, improving disturbance rejection while maintaining a relatively simple overall sensor arrangement.
Solution Approach 2:
Multiple magnetic field sensors are positioned at different locations created by the recesses, effectively copying the measurement function at multiple points. This allows for differential measurements that reject common-mode disturbances while maintaining simplicity through the use of identical sensor types and a systematic arrangement pattern.
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 improves measurement accuracy by increasing current density and reducing disturbances, allowing for precise detection of electrically induced magnetic fields while minimizing interference from adjacent busbars.
Implementation Method 1
measuring a strength of the electrically induced magnetic field
Implementation Method 2
The magnetic field sensitive element is adapted to detect a magnetic field generated by a current flowing through a conductor
Data Source
AI summary
A sensor device and a sensor arrangement for determining an electrically induced magnetic field are disclosed. The sensor device includes a busbar and a first magnetic field sensor arranged on the first busbar surface. The busbar has a busbar longitudinal axis, a first busbar surface, a first recess, and a second recess. The first recess and the second recess extend substantially orthogonal to the first busbar surface. The first recess and the second recess are spaced apart from each other along the busbar longitudinal axis. The first magnetic field sensor is arranged on the first busbar surface between the first recess and the second recess using an/the entire surface of the first magnetic field sensor facing the first busbar surface.