Segmented Magnetic Shield for Current Sensor Saturation
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Solution Overview
Problem
Current sensors face challenges in reducing the influence of disturbance magnetic fields, which can lead to magnetic saturation and decreased sensitivity in detecting current magnitudes.
Innovation Solution
The design incorporates a conductor with branched flow paths and magnetic shield portions arranged in a U-shape or substantially U-shape configuration, with magnetic sensors positioned to detect magnetic fields generated by currents flowing through these paths, and differential amplification to enhance sensitivity and reduce disturbance field impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic shield body is used to reduce disturbance magnetic fields, then measurement precision is improved, but magnetic saturation occurs reducing sensitivity
Solution Approach 1:
The magnetic shield body is divided into multiple segments (first magnetic shield portion and second magnetic shield portion) separated by a non-magnetic material. This segmentation prevents magnetic flux concentration that would cause saturation, while each segment still provides shielding against disturbance magnetic fields, thus maintaining both precision and sensitivity.
Solution Approach 2:
A non-magnetic material is introduced as an intermediary between the first and second magnetic shield portions. This intermediary prevents direct magnetic coupling that would lead to saturation, while allowing the shield body to maintain its shielding function against external disturbance fields, resolving the contradiction between precision and sensitivity.
2Measurement precision
If magnetic shield portions are added to reduce disturbance fields, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The magnetic shield body serves multiple functions simultaneously: it shields against disturbance magnetic fields, prevents magnetic saturation through its segmented design, and provides structural support for the sensor components. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while improving measurement precision.
Solution Approach 2:
The segmented magnetic shield portions are arranged in a nested configuration around the conductor, with the non-magnetic material interspersed. This nested arrangement achieves effective shielding and saturation prevention within a compact structure, minimizing the increase in device complexity while maximizing measurement precision.
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 effectively reduces magnetic saturation, improves sensitivity to the measured current, and minimizes the influence of disturbance magnetic fields, leading to more accurate current detection.
Implementation Method 1
a magnetic shield body that is disposed between the first flow path portion and the second flow path portion and between the first magnetic element and the second magnetic element
Implementation Method 2
a magnetic shield body that is disposed between the first flow path portion and the second flow path portion and between the first magnetic element and the second magnetic element
Implementation Method 3
a first magnetic element which detects a strength of a first magnetic field generated by the current flowing in the first flow path portion
Implementation Method 4
a second magnetic element which detects a strength of a second magnetic field generated by the current flowing in the second flow path portion
Data Source
AI summary
A current sensor includes a conductor including first and second flow path portions that are branched, the first flow path portion being a portion in which a portion of a current to be measured flows and the second flow path portion being a portion in which another portion of the current flows, a first magnetic sensor to detect a strength of a first magnetic field generated by the current flowing in the first flow path portion, a second magnetic sensor to detect a strength of a second magnetic field generated by the current flowing in the second flow path portion, and magnetic shield bodies between the first and second flow path portions and between the first and second magnetic sensors.