Electronics Module Immersion Sealing with EMI Mitigation
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Solution Overview
Problem
Electronics modules face challenges in mitigating electromagnetic interference (EMI) and withstanding environmental elements like water and dust while maintaining electromagnetic compatibility (EMC) and meeting Ingress Protection (IP) ratings.
Innovation Solution
The design incorporates a housing structure with a printed circuit board (PCB) and a ground contact within a cavity sealed by a sealant, which mitigates EMI and prevents liquid intrusion, optimizing EMC and IP rating compliance with minimized space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground contact is added to mitigate EMI, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The ground contact is merged with the PCB structure, utilizing the existing circuit board as part of the grounding system. This integration allows the PCB to serve dual purposes: circuit functionality and electromagnetic shielding, thereby improving EMC without proportionally increasing device complexity.
Solution Approach 2:
The PCB is designed to perform multiple functions: it serves as the circuit board for electronics, provides a ground contact for EMI mitigation, and acts as part of the sealed cavity structure. This multi-functionality allows a single component to address multiple requirements, improving EMC while controlling overall complexity.
2Reliability
If a sealant is added to prevent liquid intrusion, then IP rating is improved, but device complexity increases
Solution Approach 1:
A sealant layer is introduced as a flexible sealing element within the cavity, creating a protective barrier against liquid intrusion. This thin film approach provides IP rating protection without requiring complex mechanical sealing mechanisms, thereby improving reliability while minimizing the increase in device complexity.
3Reliability
If housing structure is modified to include cavity and ground contact, then EMI mitigation is improved, but manufacturing complexity increases
Solution Approach 1:
The housing is segmented into a first housing portion and a second housing portion that can be separately manufactured and then assembled. This segmentation allows each portion to be optimized for its specific function (EMI shielding, sealing) and manufactured using appropriate processes, reducing overall manufacturing complexity compared to a monolithic structure.
Solution Approach 2:
The ground contact and sealant are positioned within the cavity formed by the housing portions, creating a nested arrangement where smaller functional elements are integrated within the larger housing structure. This nesting approach allows complex functionality to be achieved within a modular framework, easing the manufacturing process.
4Reliability
If PCB is positioned between housing portions with ground contact, then EMC performance is improved, but packaging space requirements increase
Solution Approach 1:
The PCB is merged with the ground contact function, eliminating the need for separate EMI shielding components. By integrating the grounding capability directly into the PCB structure and positioning it within the housing cavity, the design achieves EMC performance without requiring additional packaging space for separate shielding elements.
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 configuration effectively reduces EMI and ensures the electronics module operates properly in adverse environments, meeting both EMC and IP rating standards while minimizing size and packaging requirements.
Implementation Method 1
The ground contact is positioned on the PCB and within the cavity contacting the first receiving portion and the second receiving portion to mitigate electromagnetic interference (EMI) generated from the plurality of electronics
Implementation Method 2
The sealant is positioned within the cavity and adjacent to the ground contact to prevent liquid from contacting the plurality of electronics
Data Source
AI summary
In at least one embodiment, an electronic module includes a first housing, a second housing, a printed circuit board (PCB), a ground contact, and a sealant. The first housing includes a first receiving portion. The second housing includes a second receiving portion, the second housing being coupled to the first housing defining a cavity positioned between the first receiving portion and the second receiving portion. The printed circuit board (PCB) is positioned between the first housing and the second housing therein to receive a plurality of electronics. The ground contact is positioned on the PCB and within the cavity contacting the first receiving portion and the second receiving portion. The ground contact mitigates electromagnetic interference (EMI) generated from the plurality of electronics. The sealant is positioned within the cavity and adjacent to the ground contact to prevent debris or liquid from contacting the plurality of electronics.