Coaxial Current Measurement Component With Equipotential Noise Shielding
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Solution Overview
Problem
Existing current measurement devices for coaxial transmission paths are affected by electric and electromagnetic fields generated by differences in electrical potential, leading to decreased measurement accuracy.
Innovation Solution
A current measurement component with a pair of side surface portions, a bridging portion, and coaxial components, where the side surface portions and bridging portion are electrically conductive, and a tube-like portion with a gap, ensuring the electrical potential is uniform, and the current sensor is isolated from external noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measurement coil is attached to a measurement fitting connected to a return conductor of a coaxial cable, then current can be measured, but measurement accuracy decreases due to electric and electromagnetic fields generated by potential differences
Solution Approach 1:
The patent applies equipotentiality by making the side surface portions and bridging portion electrically conductive to equalize electrical potential across the measurement component. This eliminates potential differences that generate harmful electric and electromagnetic fields, allowing accurate current measurement without interference. The conductive structure ensures all parts are at the same potential, preventing field generation while maintaining measurement capability.
2Measurement precision
If a tube-like portion encloses the connection portion with a gap, then electrical potential uniformity is achieved and noise is reduced, but device complexity increases
Solution Approach 1:
The tube-like portion acts as an intermediary shielding structure that encloses the connection portion. The gap in the tube-like portion allows magnetic field penetration for measurement while the tube itself shields against external electromagnetic interference. This intermediary structure achieves noise reduction and potential uniformity without requiring complete enclosure, balancing protection needs with measurement requirements.
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
Accurate measurement of current is achieved by minimizing the effects of electric and electromagnetic fields, improving measurement precision and reducing noise interference.
Implementation Method 1
a tube-like portion enclosing an outer peripheral portion of the connection portion with a gap formed between the tube-like portion and the outer peripheral portion of the connection portion
Implementation Method 2
the pair of side surface portions and the bridging portion are electrically conductive such that outer conductors of the pair of coaxial components are electrically connected
Data Source
AI summary
A current measurement component including a bridging portion bridging a pair of side surface portions, a pair of coaxial components attached to the pair of side surface portions, respectively, each coaxial pair including an inner conductor that extends through a hole formed in a corresponding side surface portion of the pair of side surface portions, a connection portion electrically connecting the inner conductors of the pair of coaxial components, and a tube-like portion enclosing the connection portion with a gap formed between the tube-like portion and an outer peripheral portion of the connection portion. The pair of side surface portions and the bridging portion are electrically conductive and electrically connected, and the tube-like portion includes a base end portion electrically connected to a first side surface portion of the pair of side surface portions and a distal end portion electrically separated from the outer conductor of coaxial component pairs.