Current Sensor Magnetic Shield Core Gap Disturbance Suppression
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Solution Overview
Problem
Current sensors face challenges in maintaining linearity and accuracy due to magnetic saturation and the influence of disturbance magnetic fields, especially when high currents flow through conductors, which can lead to decreased detection accuracy.
Innovation Solution
A current sensor design incorporating a magnetic detection unit, a magnetization core with specific core sections, and a magnetic shield that includes plate-shaped shield portions and slit sections to effectively suppress disturbance magnetic fields, ensuring the magnetic detection unit is positioned to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the gap in the magnetic core is widened to improve linearity, then the magnetic saturation is reduced, but the detection accuracy decreases due to increased disturbance magnetic field influence
Solution Approach 1:
A magnetic shield is introduced as an intermediary component between the magnetic core and the magnetic detection element. The magnetic shield is positioned to overlap the core gap when viewed along the third direction, serving as a mediator that blocks disturbance magnetic fields from reaching the detection element while allowing the magnetic flux from the conductor to pass through, thus resolving the contradiction between linearity and detection accuracy
Solution Approach 2:
The harmful disturbance magnetic fields are extracted and blocked by the magnetic shield, separating the useful magnetic flux signal from the harmful interference. The magnetic shield effectively removes the disturbance magnetic fields from the detection path, enabling accurate measurement even with a widened core gap
2Stability of the object's composition
If the volume of the magnetic core is increased to improve linearity, then the magnetic saturation is reduced, but the device complexity and size increase
Solution Approach 1:
Instead of increasing the magnetic core volume, a magnetic shield is introduced as a separate intermediary component. This approach achieves linearity improvement without requiring a larger or more complex magnetic core structure, as the shield handles the magnetic flux management independently
Solution Approach 2:
The magnetic system is segmented into distinct functional components: the magnetic core for flux generation, the magnetic shield for disturbance blocking, and the detection element for measurement. This segmentation allows each component to be optimized independently, avoiding the need to increase overall device complexity
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 proposed design enhances the accuracy and linearity of current detection by effectively shielding the magnetic detection unit from disturbance fields, maintaining stable magnetic flux density and improving frequency characteristics, even at high current levels.
Implementation Method 1
a magnetic sensor including a magnetic detection element capable of detecting a magnetic field generated by a current flowing through a conductor
Implementation Method 2
a magnetic shield... the magnetic shield includes a plate-shaped shield portion positioned to overlap the core gap when viewed along the third direction
Data Source
AI summary
A magnetic sensor for detecting magnetism generated from a conductor in which a current flows in a first direction includes a magnetic detection unit capable of detecting the magnetism, a magnetization core, and a magnetic shield. The magnetization core includes a first core section, which is substantially parallel to the first direction, and a second core section and third core section, which are each continuous from both end portions of the first core section in a second direction that is orthogonal to the first direction. The second core section and the third core section each extend from an end portion of the first core section to follow a third direction that is orthogonal to the first direction and the second direction. The magnetic detection unit has a sensitivity direction in the second direction and is positioned in a core gap sandwiched between the vicinity of the end portion of the second core section and the vicinity of the end portion of the third core section in the third direction. The magnetic shield includes a plate-shaped shield portion positioned to overlap the core gap when viewed along the third direction.