Current Sensor System Asymmetric Alignment Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current current sensor systems face challenges in accurately measuring current due to high crosstalk between sensors and conductors, leading to reduced accuracy and reliability, especially in safety-critical applications like automobile control systems.
Innovation Solution
The system incorporates a printed circuit board with conductors having through-holes and notches, where current sensors with magnetic field sensing elements are strategically aligned to minimize crosstalk by positioning them with axes of maximum sensitivity perpendicular to the conductor axes, and using notches to focus current density and reduce eddy currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensing elements are aligned perpendicular to conductor axes to reduce crosstalk, then measurement precision is improved, but the device complexity increases due to strategic alignment requirements
Solution Approach 1:
The magnetic field sensing elements are deliberately aligned asymmetrically relative to the conductor axes, specifically positioned perpendicular to the conductor axes rather than parallel. This asymmetric orientation exploits the magnetic field distribution pattern around conductors to minimize crosstalk interference from adjacent conductors while maximizing sensitivity to the target conductor's magnetic field.
Solution Approach 2:
The solution transitions from conventional parallel alignment (one-dimensional approach along the conductor axis) to perpendicular alignment, effectively utilizing a different spatial dimension for sensor orientation. This dimensional change allows the sensing elements to be positioned in an orientation that naturally rejects crosstalk from adjacent conductors while maintaining sensitivity to the target field.
2Measurement precision
If through-holes and notches are introduced in conductors to focus current density, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
Through-holes and notches are pre-formed in the conductor structure before final assembly with the sensor. This preliminary action creates predetermined regions of concentrated current density that guide the magnetic field distribution in a known pattern, allowing the sensor to be positioned optimally relative to these pre-established field concentration zones.
Solution Approach 2:
The conductor structure is modified locally at specific positions where through-holes and notches are introduced to create regions of enhanced current density. These localized modifications do not alter the entire conductor but rather create specific zones with different electromagnetic properties, concentrating the magnetic field in targeted areas for improved sensor detection.
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 enhances the accuracy and reliability of current measurement by reducing crosstalk and increasing the magnetic field sensed by the sensors, thereby improving the overall performance of current sensor systems in safety-critical applications.
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
Implementation Method 2
using notches to focus current density and reduce eddy currents
Data Source
Figure 1
Figure 2
Figure 3
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.