Flexible Circuit Motherboard Capacitor Crack Detection Layout
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Solution Overview
Problem
Existing detection methods for flexible circuit boards cannot effectively identify small cracks in capacitors before the boards are ready for delivery, which can lead to quality issues due to water vapor penetration and ion migration causing short circuits.
Innovation Solution
A flexible circuit mother board with detection terminal groups and external pad groups that connect to each capacitor's electrode plates, allowing for the application of a constant voltage to detect abnormal current values, determining capacitor reliability before delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing detection methods are used for flexible circuit boards, then the manufacturing process is simple and fast, but small cracks in capacitors cannot be detected, leading to quality issues
Solution Approach 1:
The detection system is segmented into multiple detection terminal groups, where each group contains multiple detection terminals that can be paired to form detection terminal pairs. This segmentation allows the system to detect multiple capacitors simultaneously while maintaining manageable complexity through modular organization of detection resources.
Solution Approach 2:
The detection terminal groups are designed with multi-functionality, where each detection terminal can be paired with multiple other terminals to detect different capacitors. This universal design allows a single set of detection terminals to perform multiple detection functions, improving measurement precision without proportionally increasing device complexity.
2Reliability
If detection terminal groups are added to each flexible circuit daughter board, then capacitor reliability can be detected, but the device complexity increases
Solution Approach 1:
Multiple detection terminals are merged into detection terminal groups that share common detection resources. The detection terminals within each group are electrically connected to capacitors through shared external pad groups, allowing multiple capacitors to be detected using a consolidated detection structure rather than individual dedicated detection circuits for each capacitor.
Solution Approach 2:
The detection terminal groups and external pad groups are pre-configured on the flexible circuit mother board before the actual detection process. This preliminary arrangement of detection infrastructure allows for reliable capacitor detection without adding complexity during the actual detection operation, as the detection pathways are already established.
3Measurement precision
If all capacitors are detected individually, then detection precision is high, but detection time and productivity are reduced
Solution Approach 1:
Multiple capacitors are merged into a single detection cycle through the use of detection terminal pairs. Each detection terminal pair can detect multiple capacitors simultaneously by electrical connection to their respective electrode plates, allowing parallel detection that maintains individual capacitor detection accuracy while significantly improving overall detection productivity.
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 method enables early detection of capacitor abnormalities, improving quality monitoring and preventing short circuits by identifying capacitors with small cracks before assembly into modules.
Implementation Method 1
connecting the detection terminal pair to a constant voltage source... detecting a current in a loop where the detection terminal pair and the at least one capacitor are located
Data Source
AI summary
Provided are a flexible circuit mother board and a detection method. The flexible circuit mother board includes flexible circuit daughter boards, at least one detection terminal group and external pad groups corresponding to the flexible circuit daughter boards in one-to-one correspondence. Each flexible circuit daughter board has a bonding pad area adjacent to a corresponding one of the plurality of external pad groups. Each detection terminal group detects at least one flexible circuit daughter board, and each of the at least one detection terminal group comprises a plurality of detection terminals. Each flexible circuit daughter board includes a plurality of capacitors including a first electrode plate and a second electrode plate. Each of the first electrode plate and the second electrode plate is electrically connected to one detection terminal.