Spring-Loaded Electronic Component Mounting for Thermal Stability
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Solution Overview
Problem
Existing electronic component mounting methods face challenges in maintaining stable mechanical connections over time, leading to increased thermal resistance and potential failure, especially in applications where re-tightening is difficult or undesirable.
Innovation Solution
An assembly comprising a heat-generating semiconductor device, a die pad embedded in a plastic housing, and a resilient member like a helical spring, which is compressed between the electronic component and a fixing member to secure it to a substrate, providing a stable mechanical connection with a force of 0.2 Nm to 2 Nm, thereby improving thermal contact and reducing thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fixed mechanical connection (e.g., screw) is used to secure the electronic component to the substrate, then the mechanical strength is improved, but the thermal contact stability deteriorates over time due to loosening
Solution Approach 1:
The patent replaces the static fixed screw connection with a dynamic spring-loaded pressing mechanism. The resilient member (spring) continuously applies pressing force to maintain thermal contact between the heat dissipation component and substrate, compensating for any loosening or dimensional changes over time. This dynamic adaptation ensures stable thermal contact while reducing mechanical connection complexity.
Solution Approach 2:
The patent substitutes the traditional mechanical screw-fastening system with a spring-based pressing mechanism combined with thermal conduction. The resilient member provides continuous mechanical pressure without requiring periodic tightening, while the thermal conduction path ensures heat dissipation. This replacement eliminates the loosening issue inherent in fixed mechanical connections.
2Temperature
If additional mechanical fixing components (e.g., screws, clips) are added to improve heat dissipation, then the thermal performance is improved, but the device complexity increases
Solution Approach 1:
The patent merges the mechanical fixing function and thermal conduction function into a single integrated mounting structure. The resilient member simultaneously provides mechanical pressing force for thermal contact and serves as part of the mounting mechanism. The housing structure integrates the aperture for the fixing member and the heat dissipation path, eliminating the need for separate mechanical fasteners and thermal interface components.
Solution Approach 2:
The mounting structure is designed to perform multiple functions: the resilient member provides both mechanical retention and thermal contact pressure; the housing aperture serves both as a mounting feature and a heat dissipation path; the substrate provides both structural support and thermal conduction. This multi-functionality reduces the number of components while improving thermal performance.
3Stability of the object's composition
If a rigid fixed connection is used, then the mechanical stability is improved, but the adaptability to substrate variations deteriorates
Solution Approach 1:
The spring-loaded resilient member provides a dynamic pressing force that automatically adapts to variations in substrate thickness, flatness, or thermal expansion. The spring can compress or extend within its elastic range to maintain optimal contact pressure, ensuring stable thermal and mechanical connection across different substrate conditions without requiring precise pre-adjustment.
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 solution enables a simple, reliable, and stable mechanical connection that maintains effective heat dissipation over extended periods, improving the reliability and thermal performance of electronic components in applications like Switched Mode Power Supplies.
Implementation Method 1
The resilient member is engaged under compression between an upper side of the electronic component and a lower surface of the fixing member
Implementation Method 2
the resilient member comprises a helical spring
Implementation Method 3
dissipation to the substrate via the plastic housing and/or the pins... improve heat dissipation... reduce the thermal resistance of the interface
Data Source
AI summary
In an embodiment, an assembly includes an electronic component, a fixing member, a resilient member and a substrate having a first surface. The electronic component includes a heat-generating semiconductor device, a die pad and a plastic housing. The heat-generating semiconductor device is mounted on a first surface of the die pad, and the die pad is at least partially embedded in the plastic housing. The resilient member is engaged under compression between an upper side of the electronic component and a lower surface of the fixing member and the fixing member secures the electronic component to the first surface of the substrate.