Circuit Board Coil Pattern for Junction Current Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reducing unnecessary electromagnetic radiation from circuit boards when mounted in electronic apparatuses are inefficient due to the difficulty in measuring current distribution and adjusting electric characteristics in complex casings, leading to time-consuming and costly countermeasures.
Innovation Solution
A circuit board with a coil-shaped conductive pattern around through holes to detect and measure junction currents, allowing for real-time measurement and adjustment of currents flowing between the circuit board and casing, using a filter circuit to reduce electromagnetic interference (EMI) by intersecting magnetic flux and providing a feedback function for optimizing electric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is inserted into the connecting portion between the circuit board and the casing to control current intensity, phase, and frequency, then electromagnetic radiation from the casing is reduced, but it is difficult to promptly obtain effective characteristics because the current path and electric characteristics are obscure
Solution Approach 1:
The patent replaces traditional mechanical/current-based measurement methods with magnetic field sensing. A magnetic field sensor detects the magnetic field generated by the current flowing through the junction part, enabling non-contact, accurate measurement of the problematic current without requiring physical access to the current path or knowledge of complex electric characteristics.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary to measure the current. Instead of directly measuring the electric current which has obscure paths, the system measures the magnetic field generated by the current, which provides clear measurement information about the current's intensity, phase, and frequency characteristics.
2Stability of the object's composition
If the casing has a three-dimensional complicated shape, then it encloses the circuit board effectively, but it is difficult to measure the current distribution, so that it takes time and costs are high
Solution Approach 1:
The patent extracts the measurement function from the complex casing structure by placing a magnetic field sensor on the circuit board near the junction part. This separates the measurement system from the complicated three-dimensional casing, allowing current measurement without being constrained by the casing's complex geometry.
Solution Approach 2:
The patent replaces complex physical measurement methods that would be required for complicated three-dimensional structures with magnetic field sensing. The magnetic field sensor can accurately detect current characteristics regardless of the casing's complex shape, simplifying the measurement system.
3Object-affected harmful factors
If EMI countermeasures are taken on the circuit board sole body, then radiation from the board is reduced, but when the circuit board is mounted on the casing, a new EMI countermeasure is necessary because the whole board operates as an exciting source and the casing functions as an antenna
Solution Approach 1:
The patent implements a feedback mechanism where a magnetic field sensor detects the actual current flowing through the junction part, and this information is used to control a variable inductor that adjusts the current characteristics. This closed-loop feedback system dynamically optimizes EMI reduction based on real-time measurements, making the EMI countermeasure system adaptive rather than static.
Solution Approach 2:
The patent uses a variable inductor whose inductance can be dynamically adjusted based on feedback from the magnetic field sensor. This dynamic adjustment allows the EMI countermeasure to adapt to changing operating conditions and accurately control the current intensity and phase, rather than using fixed passive components.
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
Enables prompt and effective EMI countermeasures by allowing for the measurement and adjustment of currents in the mounted state, reducing unnecessary electromagnetic radiation and improving the overall EMI performance of the electronic apparatus.
Implementation Method 1
a coil-shaped conductive pattern provided on a plane perpendicular to the through hole so as to intersect a circumference around the through hole as a center
Data Source
AI summary
A circuit board having: a through hole to mount the circuit board to a casing or an electronic apparatus; and a coil-shaped conductive pattern provided on a plane perpendicular to the through hole so as to intersect a circumference around the through hole as a center.