PCB Superficial Metallic Conductor for High Current
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Solution Overview
Problem
Existing printed circuit board (PCB) assemblies face challenges in handling high-current loads due to limitations in fabricating conductive pathways that can effectively carry such currents, particularly in downhole environments where extreme conditions prevail, leading to potential operational failures.
Innovation Solution
The solution involves overlaying a superficial metallic conductor on existing planar conductive pathways in PCBs to increase their thickness and current-carrying capacity, allowing for localized high-current pathways while maintaining low-current pathways, and providing a robust attachment point for bus bars to ensure mechanical stability and electrical communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional planar conductive pathways are used in PCB assemblies, then manufacturing is simple and cost-effective, but current-carrying capacity is insufficient for high-current loads
Solution Approach 1:
The conductive pathway is segmented into two distinct components: traditional planar conductive pathways for low-current signals and additive metallic conductors for high-current loads. This segmentation allows each pathway type to be optimized independently - planar pathways maintain simple manufacturing while additive pathways provide enhanced current capacity where needed.
Solution Approach 2:
Additive metallic conductors are applied locally only to specific regions of the PCB where high-current capacity is required, rather than uniformly across the entire board. This localized approach increases current-carrying capacity at critical points while avoiding the manufacturing complexity and cost of thick-copper pathways throughout the entire PCB.
2Quantity of substance
If uniform thick copper pathways are used throughout the PCB, then current-carrying capacity increases, but material usage increases and manufacturing complexity increases
Solution Approach 1:
Thick additive metallic conductors are deposited only in specific locations where high current flow is required, such as power delivery regions or high-power component areas. Low-current signal regions continue to use standard thin planar copper pathways, significantly reducing overall copper material usage while maintaining adequate current capacity where needed.
Solution Approach 2:
Instead of applying thick copper uniformly across the entire PCB (excessive action), the additive conductor process is applied partially only to regions requiring enhanced current capacity. This partial application reduces material consumption while still achieving the necessary current-carrying performance for high-current loads.
3Reliability
If planar conductive pathways are used, then manufacturing is straightforward, but reliability under extreme downhole conditions is insufficient
Solution Approach 1:
The PCB employs a composite conductive system combining traditional planar copper pathways with additive metallic conductors (such as thick copper or alternative metals). This composite structure leverages the advantages of both approaches - the planar pathways provide stable, proven performance for signals, while the additive conductors provide enhanced current capacity and reliability for power delivery under extreme downhole conditions.
Solution Approach 2:
The conductive system is segmented into separate functional zones: planar pathways handle low-current signals with proven reliability, while additive metallic conductors handle high-current power delivery. This segmentation allows each subsystem to be optimized for its specific function, improving overall system reliability under extreme conditions without requiring complete redesign of the entire PCB structure.
Data Source
AI summary
Printed circuit board assemblies having capabilities for operating under high ampacity conditions are sometimes difficult to fabricate and lack sufficient mechanical robustness for extreme operating environments. Accordingly, printed circuit board assemblies comprise: a non-conductive substrate having a plurality of planar conductive pathways disposed thereon; an electronic component that is in electrical communication with one or more of the planar conductive pathways and is configured to supply an electrical current thereto; a superficial metallic conductor overlaying one or more of the planar conductive pathways, at least in part, the superficial metallic conductor having an electrical connection to the electronic component and also being in electrical communication with the planar conductive pathways; and a conductive element in electrical communication with the superficial metallic conductor, the conductive element being configured to withdraw electrical current from the printed circuit board assembly.