Circuit Board Insulation Resistance Calculation via Segmented Testing
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Solution Overview
Problem
Conventional insulation test methods fail to accurately calculate the resistance value of short-circuit failures between wiring patterns on circuit boards, leading to increased defective rates and manufacturing costs due to the complexity of modern circuit board designs with narrower line widths and pitches.
Innovation Solution
An insulation test apparatus and method that selects wiring patterns for measurement, sends a predetermined electric signal, measures electrical signals, and calculates electrical characteristics of insulation failures using a two-terminal measurement approach, allowing for the identification and calculation of resistance values at insulation failure portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional insulation test methods are used, then testing can be performed on circuit boards, but accurate resistance value calculation of insulation failure portions is not achieved
Solution Approach 1:
The patent segments the insulation test process into multiple measurement steps. First, a preliminary insulation test is performed to detect the presence of insulation failure. Then, a second measurement is conducted specifically to calculate the resistance value of the failure portion. This segmentation allows the system to first identify failures and then accurately measure their characteristics, resolving the contradiction between detection capability and measurement precision.
Solution Approach 2:
The patent applies preliminary action by performing an initial insulation test before conducting the precise resistance measurement. The first measurement serves as a preliminary step to identify which wiring patterns have insulation failures, enabling subsequent targeted measurements to accurately calculate resistance values only for defective portions, thereby improving both detection reliability and measurement precision.
2Productivity
If wiring patterns are formed with narrower line widths and pitches, then circuit board functionality is improved, but insulation failure probability increases
Solution Approach 1:
The patent implements feedback by continuously monitoring insulation characteristics during the testing process. The system measures insulation resistance values and compares them against threshold values to identify failures. This feedback mechanism enables real-time detection of insulation failures in densely packed circuit boards, allowing manufacturers to maintain high productivity while improving reliability through accurate failure detection and analysis.
3Reliability
If insulation failures are not accurately detected, then defective rate increases, but detailed measurement of failure portions is not performed
Solution Approach 1:
The patent applies dynamics by making the measurement process adaptive based on detection results. The system dynamically adjusts its measurement strategy: when insulation failure is detected in the first measurement, it automatically proceeds to perform detailed resistance value calculations in a second measurement. This dynamic approach ensures that detailed analysis is performed only when necessary, improving reliability without wasting resources on unnecessary measurements.
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 accurate calculation of resistance values at insulation failure points, reducing defective rates and manufacturing costs by effectively identifying and analyzing insulation failures on circuit boards.
Implementation Method 1
power supply means for sending a predetermined electric signal between the first object to be measured and the target object to be measured
Implementation Method 2
measurement means for measuring an electrical signal at the time when the power supply means sends its electrical output between the first object to be measured and the target object to be measured
Data Source
AI summary
An insulation test apparatus and method for a circuit board having a plurality of wiring patterns formed thereon includes: selection means for selecting wiring patterns to be tested, power supply means for sending a predetermined electrical output between a first object to be measured and a target object to be measured; measurement means for measuring an electrical signal between the first object to be measured and the target object to be measured; and calculation means for calculating the resistance of an insulation failure portion between the first object to be measured and the target object to be measured.