Dynamic Impedance Testing for PCB Trace Tolerance
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Solution Overview
Problem
Current techniques for testing electrical components do not effectively account for variations in manufacturing tolerances, particularly impedance variations between traces on printed circuit boards, which can lead to significant deviations in system operation.
Innovation Solution
The method involves using an impedance varying device to dynamically increase the magnetic field strength applied to pairs of traces on a printed circuit board until the impedance exceeds a predetermined threshold, allowing for the measurement and recording of operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current testing techniques are used, then testing is simpler and faster, but manufacturing tolerance variations are not accounted for leading to inaccurate results
Solution Approach 1:
The patent applies parameter changes by dynamically varying the impedance of trace pairs during testing. An impedance varying device modifies the electrical impedance parameters of the traces to simulate different manufacturing tolerance conditions, allowing the test to account for real-world variations without requiring multiple physical prototypes. This resolves the contradiction by enabling comprehensive tolerance testing through parameter manipulation rather than physical diversity.
Solution Approach 2:
The patent introduces an impedance varying device as an intermediary component between the test signal source and the traces. This intermediary device actively adjusts impedance to simulate manufacturing variations, serving as a mediator that bridges the gap between ideal testing conditions and real-world tolerance scenarios. This approach enables accurate tolerance accounting without directly testing numerous physical variants.
2Reliability
If batch testing of multiple PCBs is performed, then manufacturing tolerances are better represented, but testing time and resource consumption increase
Solution Approach 1:
Instead of physically testing multiple PCB batches to cover tolerance ranges, the patent changes the electrical impedance parameters dynamically during a single test run. The impedance varying device sweeps through a range of impedance values that represent manufacturing tolerances, allowing one PCB to be tested under multiple tolerance conditions. This maintains reliability through comprehensive tolerance coverage while dramatically improving productivity by eliminating the need for repeated physical testing.
Solution Approach 2:
The patent transforms static testing into a dynamic process by continuously varying impedance parameters during the test. Rather than performing separate static tests on multiple PCBs, the system dynamically adjusts impedance to simulate different manufacturing conditions in real-time. This dynamic approach achieves the same reliability as batch testing but with much higher efficiency since all tolerance variations are tested within a single continuous test sequence.
3Ease of operation
If impedance variations are ignored, then testing is simpler, but system performance deviation increases
Solution Approach 1:
The patent resolves this contradiction by automatically varying the impedance parameter during testing without requiring complex manual setup. The impedance varying device handles the complexity of parameter changes internally, maintaining testing simplicity from the operator's perspective while ensuring that impedance variations are comprehensively accounted for. This preserves ease of operation while significantly improving reliability through accurate tolerance representation.
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 approach ensures comprehensive testing of electrical components by accounting for a range of manufacturing tolerances, providing accurate measurements of operating parameters and ensuring consistent system performance.
Implementation Method 1
increasing, by an impedance varying device at the behest of a testing device, magnetic field strength of a magnetic field applied to the pair of traces by the impedance varying device
Data Source
AI summary
Testing an electrical component, the component including a printed circuit board (‘PCB’) with a number of traces, the traces organized in pairs with each trace of a pair carrying current in opposite directions and separated from one another by a substrate layer of the PCB, where testing of the electrical component includes: dynamically and iteratively until a present impedance for a pair of traces of the component is greater than a predetermined threshold impedance: increasing, by an impedance varying device at the behest of a testing device, magnetic field strength of a magnetic field applied to the pair of traces by the impedance varying device, including increasing the present impedance of the pair of traces; measuring, by the testing device, one or more operating parameters; and recording, by the testing device, the measurements of the operating parameters.