Current Sensor Layout for Crosstalk-Resistant Measurement
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Solution Overview
Problem
Existing current sensor systems face challenges in accurately measuring high currents due to high crosstalk between conductors, leading to reduced accuracy and compliance with safety-critical application standards.
Innovation Solution
The system employs a printed circuit board with conductors featuring through-holes and notches, aligning magnetic field sensing elements to minimize crosstalk by ensuring equal magnetic field exposure to sensing elements, thereby improving accuracy and compliance with safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conductors are placed close together to increase current carrying capacity, then productivity is improved, but crosstalk between conductors increases leading to reduced measurement precision
Solution Approach 1:
A magnetic shield comprising magnetically permeable material is positioned between adjacent conductors to block and redirect magnetic field lines. This intermediary structure prevents magnetic flux from one conductor from interfering with current sensors measuring adjacent conductors, thereby eliminating crosstalk while allowing conductors to remain in close proximity for high current capacity.
2Measurement precision
If magnetic field sensing elements are positioned close to conductors to improve sensitivity, then measurement precision is improved, but crosstalk from adjacent conductors increases
Solution Approach 1:
The magnetic shield acts as a mediator that allows the sensing elements to remain close to their target conductor for high sensitivity while blocking magnetic fields from adjacent conductors. The shield redirects magnetic flux lines to follow the permeable material, creating a confined magnetic path that prevents interference with neighboring conductors and sensors.
3Volume of stationary object
If conductors are arranged in a compact layout to reduce system size, then volume is reduced, but crosstalk between conductors increases reducing reliability
Solution Approach 1:
Magnetic shields are integrated into the compact conductor arrangement, allowing multiple conductors to be densely packed while maintaining measurement reliability. The shields are positioned between adjacent conductors to prevent magnetic field interference, enabling high-density layouts without sacrificing measurement accuracy or reliability in safety-critical applications.
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 configuration reduces crosstalk, enhances measurement accuracy, and meets safety-critical application requirements by aligning magnetic field sensing elements to ensure equal magnetic field exposure, thus improving the reliability of current measurement.
Implementation Method 1
a first current sensor that is mounted on the printed circuit board, the first current sensor being disposed at least partially inside the first through-hole, the first current sensor including a first pair of magnetic field sensing elements
Data Source
AI summary
A system, comprising: a printed circuit board; a first conductor having a first central longitudinal axis, the first conductor having a first through-hole that is formed therein; a second conductor having a second central longitudinal axis; and a first current sensor that is mounted on the printed circuit board, the first current sensor being disposed at least partially inside the first through-hole, the first current sensor including a first pair of magnetic field sensing elements, the magnetic field sensing elements in the first pair being aligned with a first alignment axis that is arranged at a first angle relative to the second central longitudinal axis, the first angle being less than 75 degrees.