Hall Sensor Centering in Magnetic Core Gap
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Solution Overview
Problem
Conventional current sensing devices are susceptible to external magnetic fields due to the offset positioning of the sensor chip, leading to errors in output signals.
Innovation Solution
The sensor package, including a magnetism-responsive Hall element, is positioned at the center of the gap between the end surfaces of the magnetic core, minimizing the influence of external magnetic fields by aligning the Hall element forming surface parallel to the opposing faces of the magnetic core, thereby reducing output errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sensor package is positioned at the center of the gap, then susceptibility to external magnetic field is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric positioning of the sensor chip within the gap, specifically placing it closer to one end surface of the magnetic core rather than at the exact center. This asymmetric arrangement creates an optimal balance between reducing external magnetic field interference and maintaining manufacturing feasibility, as it positions the sensor in a region where the magnetic flux density from external fields is minimized while keeping alignment tolerances achievable
Solution Approach 2:
The patent optimizes the positional parameters of the sensor chip by adjusting its distance from the end surfaces of the magnetic core. By carefully selecting and fixing these dimensional parameters during design, the patent achieves a configuration that minimizes external magnetic field susceptibility while establishing clear manufacturing specifications that balance precision requirements with production capabilities
2Ease of operation
If the sensor chip is offset from the center for easy installation, then ease of operation improves, but measurement precision deteriorates
Solution Approach 1:
The patent adopts an asymmetric positioning strategy that deliberately offsets the sensor chip from the exact center of the gap. This asymmetric placement is optimized to reduce external magnetic field interference while maintaining practical installation characteristics, achieving a compromise that improves measurement accuracy without completely sacrificing ease of installation
Solution Approach 2:
The patent applies local quality optimization by positioning the sensor chip at a specific location within the gap where the local magnetic field characteristics are most favorable. This localized positioning optimizes the sensor's exposure to the magnetic flux generated by the current-carrying conductor while minimizing exposure to external magnetic fields, thereby improving measurement precision at that specific location
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 significantly reduces the impact of external magnetic fields on the sensor output, minimizing errors and enhancing the accuracy of current sensing by maintaining the sensor chip's position at a consistent distance from the magnetic core's end surfaces.
Implementation Method 1
a magnetism-responsive Hall element, which is mounted on a lead frame 113
Implementation Method 2
a ring-shaped magnetic core 100 has a gap 100a and is provided to surround a conductive wire 105. When an electric current If flows in the conductive wire 105, a magnetic flux φ flows in the magnetic core 100
Data Source
AI summary
A magnetic core is shaped in a ring having a gap and disposed to surround a conductive wire. When an electric current flows in the conductive wire, a magnetic field is generated in the gap. A sensor package includes a Hall element and a lead frame, which are embedded in a resin mold. The sensor package is disposed in the gap to produce an output signal corresponding to the magnetic field in the gap. The Hall element is positioned in the center of the gap, that is, at the position which is the same distance from the end surfaces of the magnetic core.