Electronic Card Ground Plane Segmentation for Lightning Testing
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Solution Overview
Problem
Existing electronic cards with integrated functional and lightning protection components face challenges in testing lightning protection components effectively due to interference from electrostatic discharge protections, leading to erroneous results, and existing solutions either complicate the testing process or increase the volume and cost of the equipment.
Innovation Solution
An electronic card design featuring separate portions for lightning protection and functional components with isolated ground planes that are connected via a conductive housing element, allowing for effective testing without the need for 0-ohm resistances and eliminating the need for a dedicated backplane card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If functional components and lightning protection components are mounted on the same electronic card, then the volume and cost are reduced, but effective testing of lightning protection components becomes impossible due to interference from ESD protections
Solution Approach 1:
The electronic card is divided into two distinct ground zones: a first ground zone connected to the lightning protection components and a second ground zone connected to the functional components. This segmentation allows independent testing of lightning protection components by connecting test equipment to the first ground zone while the ESD protections in integrated circuits on the second ground zone cannot interfere with the test measurements.
Solution Approach 2:
A grounding element (such as a grounding screw or conductive housing element) serves as an intermediary to connect the first ground zone and the second ground zone to different ground references during testing. This intermediary enables the separation of ground potentials needed for accurate testing while maintaining the integrated card structure.
2Measurement precision
If ground plane is separated into two separate ground zones connected by 0-ohm resistances, then testing can be performed, but the solution creates slit effect in ground plane and requires removal and remounting of resistances for testing
Solution Approach 1:
The testing capability is extracted as an independent function by providing a dedicated first ground zone and connection points specifically for lightning protection component testing. This allows testing to be performed without needing to add or remove any components (such as 0-ohm resistances), as the testing infrastructure is permanently integrated into the card design.
Solution Approach 2:
The ground zones are pre-configured during card manufacturing with appropriate connection points and trace routing. This preliminary setup ensures that testing can be performed immediately upon card assembly without requiring any additional components to be added or removed, eliminating the complexity of mounting and remounting 0-ohm resistances.
3Measurement precision
If two separate electronic cards (backplane and functional card) are used, then lightning protection components can be tested effectively, but the volume and cost of the electronic equipment increase
Solution Approach 1:
The patent merges the functionality of separate backplane and functional cards into a single integrated electronic card. By implementing distinct ground zones and appropriate isolation mechanisms on the same card, it achieves the testing capability previously requiring separate cards, thereby reducing the number of components, volume, and overall system complexity.
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 design enables accurate testing of lightning protection components without interference, reduces equipment volume and cost, and ensures effective short-circuiting across the entire surface, effective at all frequencies without the use of 0-ohm resistances.
Implementation Method 1
the housing element connects together the first ground zone and the second ground zone, and therefore the first ground plane and the second ground plane
Data Source
AI summary
An electronic card comprising: a first card portion including lightning protection components, a first ground plane and a first ground zone; a second card portion comprising functional components, a second ground plane and a second ground zone; a third card portion, which separates and electrically isolates the first ground plane and the first ground zone from the second ground plane and from the second ground zone; the first ground zone and the second ground zone being unvarnished; the first ground zone and the second ground zone being arranged in order to be applied onto a housing element that is electrically conductive and that belongs to a housing in which the electronic card is integrated.