ECU Shielding Layer Layout for High-Speed EMI Control
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Solution Overview
Problem
In-vehicle electronic control devices for advanced driving assistance systems (ADAS) and automatic driving (AD) face challenges in improving shielding performance against electromagnetic wave noise due to increasing processing speeds.
Innovation Solution
An electronic control device with a circuit board mounted on a conductive housing, featuring an electromagnetic wave shielding layer interposed between the circuit board and the housing, and board pedestals that fix the circuit board at a predetermined distance from compression regions, enhancing electrical connection and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processing speed is increased to improve automatic driving performance, then the computational capability is enhanced, but electromagnetic wave noise generation increases
Solution Approach 1:
An electromagnetic wave shielding layer is introduced as an intermediary component between the circuit board and the housing. This shielding layer, positioned at compression regions away from board pedestals, mediates the electromagnetic interference generated by high-speed processing, blocking noise propagation while allowing the high-speed processing to continue uninterrupted.
2Reliability
If the electromagnetic wave shielding layer is compressed to improve shielding performance, then the shielding effectiveness is enhanced, but the circuit board may deform near the compression regions
Solution Approach 1:
The compression regions are strategically positioned at specific locations away from the board pedestals, creating localized compression zones. This local quality approach ensures that compression is applied only where needed for shielding effectiveness, while avoiding areas near the pedestals where compression could cause circuit board deformation or assembly issues.
3Ease of manufacture
If the shielding layer is positioned close to the board pedestals for easy assembly, then the manufacturing process is simplified, but the shielding performance is reduced
Solution Approach 1:
The shielding layer is positioned in a different spatial dimension relative to the board pedestals - specifically at compression regions located away from the pedestal areas. This dimensional repositioning allows the shielding function to operate independently from the mechanical assembly points, achieving both good shielding performance and manufacturability through optimized spatial arrangement.
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
The configuration improves electromagnetic wave noise shielding performance while stabilizing ground potential and reducing material costs by optimizing the application and compression of the electromagnetic wave shielding layer.
Implementation Method 1
an electromagnetic wave shielding layer interposed between the circuit board and the housing
Implementation Method 2
the electromagnetic wave shielding layer has compression regions pressed by the circuit board at positions away from the board pedestals by a predetermined distance
Data Source
AI summary
An electronic control device includes a circuit board on which an electronic component is mounted, a conductive housing that houses the circuit board, and an electromagnetic wave shielding layer interposed between the circuit board and the housing. The housing has board pedestals for fixing the circuit board, and the electromagnetic wave shielding layer has compression regions pressed by the circuit board at positions away from the board pedestals by a predetermined distance.