Current Detection Device Skin Effect Suppression
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Solution Overview
Problem
Current detection devices face reduced accuracy due to the skin effect in AC currents, which increases current density at the edges and decreases it at the center of conductors, affecting the detection of AC current amounts.
Innovation Solution
A current detection device with two or more conductors where the current is shunted and flows in opposite directions, with a magnetic field detecting element placed between them to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC current flows through a flat-shaped conductor, then current detection can be performed, but skin effect reduces current density at center and increases it at edge, deteriorating detection accuracy
Solution Approach 1:
The patent divides the current path into multiple parallel flat-shaped conductors instead of using a single conductor. By segmenting the current flow into multiple paths, the skin effect that causes non-uniform current distribution in a single conductor is mitigated, as each segmented conductor experiences reduced skin effect impact individually
Solution Approach 2:
The patent combines multiple flat-shaped conductors in parallel to form a composite conductor structure. The magnetic fields generated by currents flowing through these parallel conductors are combined and detected together, providing a more accurate representation of the total current while compensating for skin effect variations in individual conductors
2Measurement precision
If multiple flat-shaped conductors are arranged in parallel, then current detection accuracy is improved, but device complexity increases
Solution Approach 1:
The parallel conductor structure serves multiple functions simultaneously: it carries the current to be measured, provides magnetic field generation for detection, and inherently compensates for skin effect. This multi-functionality reduces the need for additional correction mechanisms or complex detection systems
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 improves the accuracy of current detection by suppressing the skin effect, allowing for precise measurement of radio frequency currents.
Implementation Method 1
when a current amount of the AC current is detected on the basis of a magnetic field generated by the flow of the AC current
Implementation Method 2
an increase of a frequency of the AC current reduces a current density at a center of the conductor, and increases a current density at an edge, due to a skin effect
Data Source
AI summary
In an object of the present invention, an object is to provide a technique for achieving higher accuracy in current detection of a radio frequency current, in a current detection device.The current detection device of the present invention includes two or more conductors through which a current shunted from a same conductor flows; conductors through which the shunted current flows have portions opposed to each other; currents flow in opposite directions in opposing portions of the conductors; and a magnetic field detecting element is provided between the opposing portions of the conductors.