Current Sensor Shielding Arrangement for Magnetic Saturation
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Solution Overview
Problem
Current sensors face challenges in detecting currents due to magnetic saturation, which limits their measurement range and frequency band.
Innovation Solution
The current sensor employs a shielding configuration with multiple discontinuous shields surrounding the current path, effectively reducing magnetic saturation and external magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic-field control plate is used to amplify the magnetic field and shield the magnetic sensor element, then the magnetic field detection reliability is improved, but magnetic saturation occurs in the control plate which limits the current measurement range
Solution Approach 1:
The shield is divided into multiple discontinuous shield members (first shield, second shield, third shield) arranged at different positions. This segmentation prevents magnetic saturation in any single shield member while maintaining effective shielding, thereby expanding the current measurement range without sacrificing detection reliability.
2Object-affected harmful factors
If a continuous shielding structure is used to block external magnetic fields, then the shielding effectiveness is improved, but magnetic saturation occurs which reduces the measurement capability
Solution Approach 1:
The continuous shielding structure is segmented into multiple discrete shield members positioned at different locations. This allows the shields to collectively block external magnetic fields while distributing the magnetic flux density across multiple components, preventing saturation and maintaining measurement precision.
Solution Approach 2:
The shields are arranged in multiple spatial dimensions (different positions around the current path) rather than a single continuous structure. This multi-dimensional arrangement provides comprehensive shielding coverage while preventing magnetic saturation through spatial distribution of magnetic flux.
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 expands the current measurement range and frequency band by preventing magnetic saturation and effectively blocking external magnetic fields.
Implementation Method 1
a magnetic sensor configured to detect a magnetic field generated by a current to be measured flowing through a current path
Implementation Method 2
a shielding member including a first shield, a second shield, and a third shield disposed away from each other... capable of sufficiently attenuating external magnetic fields and reducing or controlling magnetic saturation
Data Source
AI summary
A current sensor includes a magnetic sensor configured to detect a magnetic field generated by a current to be measured flowing through a current path and a shielding member including a first shield, a second shield, and a third shield disposed away from each other. The first shield is disposed on an opposite side of the current path from the magnetic sensor in a first direction in which the magnetic sensor and the current path oppose each other and includes a first opposing surface opposing the current path. The second shield includes a second opposing surface along the first direction. The third shield includes a third opposing surface along the first direction. The second shield and the third shield are disposed such that the second opposing surface and the third opposing surface oppose each other, with the magnetic sensor and the current path sandwiched therebetween.