Current Sensor Gap Alignment for Magnetic Shielding Accuracy
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Solution Overview
Problem
Current sensors face accuracy reduction due to the oblique application of gap magnetic fields to magnetoresistive effect elements, resulting from the mismatch in height positions between the gap and the magnetic detector, which affects the resistance change and subsequent current measurement accuracy.
Innovation Solution
A current sensor design where the gap in the magnetic shield is positioned at the same height as the sensor substrate, ensuring the gap magnetic field is applied perpendicularly to the magnetoresistive effect element, reducing the likelihood of resistance change and enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gap and the magnetic detector are positioned at the same height in the z-direction, then the gap magnetic field is applied perpendicularly to the magnetoelectric converter reducing accuracy reduction, but if they are positioned at different heights then the gap magnetic field is applied obliquely causing resistance change and reducing measurement accuracy
Solution Approach 1:
The patent positions the gap and sensor substrate at the same height in the z-direction (vertical dimension), transforming the magnetic field application from oblique (affecting both perpendicular and parallel components) to purely perpendicular orientation. This dimensional alignment eliminates the harmful parallel component of the magnetic field that causes resistance changes in the magnetoresistive effect element.
2Reliability
If the magnetic shield has a gap for reducing magnetic saturation, then magnetic flux can be discharged and magnetic saturation is reduced, but a gap magnetic field is generated that may be applied obliquely to the magnetic detector reducing measurement accuracy
Solution Approach 1:
The patent applies local quality by creating a specific spatial relationship between the gap and sensor substrate - they are positioned at the same height in the z-direction. This localized positioning ensures that the gap magnetic field generated for magnetic flux discharge is oriented perpendicularly to the magnetoelectric converter, making the magnetic field's effect beneficial (reducing saturation) rather than harmful (causing measurement error).
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 design minimizes the reduction in accuracy of current detection by aligning the gap magnetic field orthogonally with the magnetoresistive effect element, thereby stabilizing the resistance change and improving measurement precision.
Implementation Method 1
a current sensor for measuring a measurement current to be measured based on a change in a resistance of a magnetoresistive effect element due to a magnetic field induced by the measurement current
Implementation Method 2
The magnetic shield surrounds the sensor substrate and the conductor to magnetically shield the inside from the outside
Implementation Method 3
A magnetic flux flowing in the magnetic shield is discharged through the gap and generates a magnetic field outside
Data Source
AI summary
A current sensor for measuring a current flowing through a conductor includes a sensor substrate, a magnetoelectric converter formed on a surface of the sensor substrate and configured to output a signal changing with an applied magnetic field, and a magnetic shield that surrounds the sensor substrate and the conductor to magnetically shield the inside from the outside. The output signal of the magnetoelectric converter changes with a magnetic filed applied along the formation surface of the sensor substrate. The magnetic shield has at least one gap for reducing magnetic saturation in the magnetic shield. The gap and the sensor substrate are located at the same height in a z-direction orthogonal to the formation surface of the sensor substrate.