Electronic Control Device PCB Compression Stress Reduction
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Solution Overview
Problem
Electronic control devices experience reduced connection reliability between printed-circuit boards and electronic components due to compression-induced stress at soldered areas, which existing technologies fail to adequately address.
Innovation Solution
An electronic control device design featuring a casing and cover that distribute compression force over a larger area of the printed-circuit board, utilizing through-holes and contact surfaces to reduce stress and enhance thickness direction strength, with optional copper foil protection and plating for reinforcement and improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the printed-circuit board is fastened to the casing using screws, then the board is securely fixed, but compression stress concentrates at the contact points around soldered areas
Solution Approach 1:
The support structure is divided into multiple support portions distributed across the casing, with each portion providing localized support. This segmentation distributes the compression force from the screw fastening across multiple contact points rather than concentrating it at a single location, thereby reducing stress on soldered areas while maintaining secure fixation
Solution Approach 2:
Female-screw holes are specifically formed at the contact surfaces of support portions that are strategically positioned away from critical soldered areas. This local adaptation of the fastening structure allows the screw heads to contact robust support portions rather than directly compressing vulnerable solder joints, maintaining fixing strength while protecting connection reliability
2Ease of manufacture
If the support portions are positioned close to the edge of the opening, then the board is easily installed, but the compression force concentrates on a small area
Solution Approach 1:
The support portions extend in the width direction of the casing, creating a broader contact surface area perpendicular to the screw fastening direction. This dimensional extension transforms a point-contact stress concentration into a distributed line or area contact, reducing compression stress while maintaining the support portions' positioning near the opening edge for easy board installation
Data Source
AI summary
The casing of an electronic control device includes a casing-side contact surface in contact with the end of a printed-circuit board. A cover includes a cover-side contact surface holding the end of the printed-circuit board together with the casing-side contact surface by being in contact with the end of the printed-circuit board. In the printed-circuit board, a held portion held between the casing-side contact surface and the cover-side contact surface is provided with a through-hole via.