Current Measurement Module Segmented Conductor Skin Effect
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Solution Overview
Problem
Existing current measurement systems face challenges in accurately measuring currents with high frequency characteristics due to the skin effect and fluctuations in magnetic flux density, particularly when the widths of the current paths are significant relative to the conductor.
Innovation Solution
The current measurement module employs two magnetic detection elements arranged close to the current paths, with a center distance of 2 mm or more, and positions the magnetic sensing surfaces within 4 mm from the conductor's surface to enhance the signal-to-noise ratio and frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the widths of current paths are increased to handle higher currents, then the current carrying capacity is improved, but the skin effect becomes more significant and magnetic flux density fluctuations increase, deteriorating measurement precision
Solution Approach 1:
The patent divides the current path into multiple narrower segments rather than using a single wide conductor. By segmenting the current path into multiple parallel narrow paths, the skin effect is reduced and magnetic flux density fluctuations are minimized, thereby improving measurement precision while maintaining the required current carrying capacity through the combined effect of multiple segments.
Solution Approach 2:
The patent implements different width characteristics at different locations of the current path. The current paths have narrow widths at sections where magnetic field detection occurs to minimize skin effect and flux fluctuations, while maintaining sufficient overall cross-sectional area for current carrying capacity. This local variation in geometry optimizes both measurement precision and current handling capability.
2Measurement precision
If the magnetic detection elements are positioned closer to the current paths to improve signal strength, then the magnetic flux density detection is improved, but the device complexity and positioning precision requirements increase
Solution Approach 1:
The patent extracts the magnetic detection function from a complex three-dimensional positioning problem by placing the magnetic detection elements in a simplified configuration relative to the current paths. The detection elements are positioned at specific distances and orientations that can be easily implemented during manufacturing, reducing positioning complexity while maintaining sufficient magnetic flux density detection capability.
Solution Approach 2:
The patent specifies concrete parameter ranges for the positioning of magnetic detection elements (such as distance of 2mm or more between elements and specific distances from current paths) that optimize magnetic flux density detection. By defining specific parameter ranges rather than requiring precise single-value positioning, the system achieves good detection performance while reducing device complexity and manufacturing difficulty.
3Measurement precision
If the center distance between magnetic detection elements is increased to reduce interference, then the signal-to-noise ratio is improved, but the device size increases
Solution Approach 1:
The patent applies a center distance of 2mm or more between magnetic detection elements, which is sufficient to reduce interference and improve signal-to-noise ratio without excessively increasing device size. This partial action (using just enough separation distance) achieves the necessary measurement precision improvement while keeping the device compact, avoiding the need for excessive separation that would unnecessarily increase dimensions.
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 ensures a sufficient magnetic flux density detection, improves the signal-to-noise ratio, and enhances the frequency characteristics of the current measurement system, particularly when the current paths are narrow relative to the conductor.
Implementation Method 1
two magnetic detection elements 21, 22 arranged at a position close to either one of the two current paths 13, 14... Each of the two magnetic detection elements 21, 22 detects an intensity of a magnetic field generated by each of the currents to be measured
Data Source
AI summary
There is provided a current measurement module including: a conductor which has two main body units arranged side by side in a first direction, and two current paths arranged side by side across a through hole in a second direction perpendicular to the first direction, and connecting the two main body units; and two magnetic detection elements which include magnetic sensing surfaces for detecting a component in a third direction perpendicular to the first direction and the second direction, in magnetic fields that are generated by currents flowing through the two current paths, and which are arranged side by side in the second direction, in which when viewed from the third direction, the two magnetic detection elements are arranged inside the through hole, and in the second direction, a center position between the two magnetic detection elements is close to either one of the two current paths.