Notched Conductor Layout for Near-Zero Current Sensor Cross-Talk
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Solution Overview
Problem
Existing sensor designs face challenges in achieving accurate current measurement with minimal cross-talk error, particularly in high-frequency applications, which can affect the reliability and safety of safety-critical systems.
Innovation Solution
The design incorporates a conductor with a through-hole and notches, positioning magnetic field sensing elements with perpendicular axes to minimize cross-talk, and using a printed circuit board with current sensors mounted inside the through-hole to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensor designs are used, then device complexity is reduced, but cross-talk error increases
Solution Approach 1:
The conductor is segmented by introducing notches that divide the conductor body into distinct sections around the through-hole. This segmentation isolates the magnetic field sensing region, reducing cross-talk between adjacent conductors while maintaining measurement accuracy.
Solution Approach 2:
The conductor features an asymmetric structure with notches positioned specifically adjacent to the through-hole but not symmetrically distributed. This asymmetric configuration optimizes the magnetic field distribution around the sensor, minimizing cross-talk error while maintaining structural integrity.
2Measurement precision
If magnetic field sensing elements are positioned closer to the conductor, then measurement accuracy improves, but cross-talk error increases
Solution Approach 1:
The notches act as intermediary structures between the magnetic field sensing elements and adjacent conductors. These notches modify the magnetic field distribution, allowing the sensor to remain close to the conductor for accurate measurement while the notches serve as magnetic field modifiers that reduce cross-talk from neighboring conductors.
Solution Approach 2:
The conductor structure is modified locally around the through-hole with notches that create a specific magnetic field environment. This local structural change affects only the immediate sensing region, maintaining high measurement accuracy while reducing cross-talk in that specific location without affecting the entire conductor.
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 reduces cross-talk error to near zero, improving the accuracy and reliability of current measurement in conductors, especially at high frequencies, meeting safety-critical application standards.
Implementation Method 1
the first current sensor including at least two first magnetic field sensing elements having respective axes of maximum sensitivity that are substantially perpendicular to the second primary surfaces of the second conductor
Data Source
AI summary
A system, comprising: a conductor having a pair of primary surfaces, the conductor including a through-hole formed therein, the conductor including a first notch that is formed adjacent to the through-hole; and a printed circuit board that is inserted in the through-hole, the printed circuit board having a current sensor mounted thereon, the current sensor being disposed inside the through-hole, the current sensor including a first magnetic field sensing element and a second magnetic field sensing element having respective axes of maximum sensitivity that are substantially perpendicular to the primary surfaces of the conductor.