Orthogonal Dual-Current Magnetic Sensor Layout to Limit Cross-Talk
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Solution Overview
Problem
Measuring two closely spaced electric currents using magnetic field sensors is challenging due to significant magnetic field flux density reduction with distance and potential magnetic cross-talk, making it difficult to obtain accurate, independent measurements.
Innovation Solution
A dual current sensor arrangement where two conductor structures are arranged perpendicular to each other, with a magnetic field sensor positioned between them, incorporating sensor elements sensitive to orthogonal magnetic fields generated by each current, allowing for independent measurement of both currents without cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic field sensor is placed close to a current-carrying conductor to measure current accurately, then measurement precision is improved, but magnetic cross-talk from adjacent conductors increases
Solution Approach 1:
The patent transitions from measuring currents in parallel conductors to measuring currents in perpendicular conductors. By arranging the first conductor along the x-axis and the second conductor along the y-axis, the magnetic fields generated by each current become orthogonal, allowing independent measurement without cross-talk interference.
Solution Approach 2:
The patent employs sensor elements with directional sensitivity, where each sensor element is configured to detect magnetic field components in specific directions. This local quality enhancement allows the sensor to selectively measure the magnetic field from one conductor while ignoring fields from other conductors.
2Measurement precision
If multiple sensor elements are used to measure orthogonal magnetic fields, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensor elements into a single integrated magnetic field sensor device. The sensor includes first sensor elements and second sensor elements that are integrated together, allowing simultaneous measurement of orthogonal magnetic field components from multiple currents within one compact structure.
Solution Approach 2:
The magnetic field sensor is designed with multi-functionality, where the same sensor device can measure magnetic fields from multiple perpendicular conductors simultaneously. The sensor elements are configured to detect different directional components, making the device universally applicable for measuring orthogonal current systems.
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
Enables accurate, power-efficient measurement of two closely spaced electric currents by minimizing magnetic cross-talk and ensuring sufficient magnetic field flux density at the sensor, thereby improving measurement precision.
Implementation Method 1
a first conductor structure extending in a first direction and configured to carry a first current along the first direction, wherein the first current produces a first magnetic field
Implementation Method 2
a second conductor structure extending in a second direction perpendicular to the first direction, wherein the second conductor structure is configured to carry a second current along the second direction, and wherein the second current produces a second magnetic field
Implementation Method 3
a magnetic field sensor arranged between the first conductor structure and the second conductor structure and configured to receive the first magnetic field and the second magnetic field, wherein the magnetic field sensor includes a first sensor element sensitive to the first magnetic field and configured to generate a first sensor signal based on the first magnetic field
Implementation Method 4
the magnetic field sensor further includes a second sensor element sensitive to the second magnetic field and configured to generate a second sensor signal based on the second magnetic field
Data Source
AI summary
A current sensor arrangement includes a first conductor structure extending in a first direction and configured to carry a first current along the first direction; a second conductor structure extending in a second direction perpendicular to the first direction and configured to carry a second current along the second direction; and a magnetic field sensor arranged between the first conductor structure and the second conductor structure and configured to receive a first magnetic field produced by the first current and a second magnetic field produced by the second current. The first conductor structure and the second conductor structure overlap with the magnetic field sensor in a third direction that is perpendicular to the first and second directions. The magnetic field sensor includes a first sensor element sensitive to the first magnetic field and a second sensor element sensitive to the second magnetic field.