Heat Sink Mounting Structure for Parallel PCB Thermal Contact

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Solution Overview

Problem

The existing electronic subassemblies face inadequate cooling due to a small cooling surface and tilted orientation of the heat sink, leading to poor thermal contact and potential damage to the electronic unit, which cannot be adequately improved by heat-conducting pastes.

Innovation Solution

An electronic subassembly design featuring a printed circuit board with a parallel-oriented heat sink and clip, utilizing an auxiliary structure with a heat sink receiver and clip receiver made of electrically insulating material, which includes retaining hooks and spacers to ensure proper alignment and secure the heat sink, allowing for improved thermal contact and reliable mounting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the heat sink is manually placed and connected to the electronic unit, then the assembly process is simple, but the contact surface becomes tilted and thermal contact deteriorates

Engineering Contradiction:

Improvemanual assembly simplicityVSAvoidcontact surface orientation

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The auxiliary structure with integrated heat sink receiver and clip receiver allows the heat sink and clip to be pre-positioned in the correct parallel orientation before final assembly. This preliminary positioning ensures proper alignment is achieved during automated assembly rather than relying on manual adjustment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The auxiliary structure acts as an intermediary component that guides both the heat sink and clip into their correct positions simultaneously. The receiver structures provide mechanical guidance to ensure parallel orientation, mediating between the automated placement process and the precision alignment requirement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If heat-conducting paste is introduced to improve thermal contact, then some cooling improvement is achieved, but the fundamental orientation problem remains unresolved

Engineering Contradiction:

Improvethermal contact qualityVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The auxiliary structure pre-positions the heat sink in the correct parallel orientation before the electronic unit is installed, eliminating the need for heat-conducting paste to compensate for misalignment. The mechanical guidance ensures proper thermal contact is achieved through correct orientation rather than through paste application.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If the heat sink contact surface is oriented at an angle to improve fit, then mounting is easier, but the cooling surface area is reduced and cooling performance deteriorates

Engineering Contradiction:

Improvemounting easeVSAvoidcooling surface area

Core Design Contradiction:

Ease of manufactureVSArea of stationary object

Solution Approach 1:

The auxiliary structure with its receiver geometry acts as a mediator that guides the heat sink into the correct parallel orientation with the electronic unit's cooling surface. The mechanical guidance features ensure maximum surface area contact is achieved while maintaining ease of mounting through automated assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures a reliable and efficient heat dissipation by maintaining a parallel orientation of the heat sink's contact surface with the electronic unit's cooling surface, preventing tilting and enhancing cooling performance, thus preventing damage and improving operational capacity.

Implementation Method 1

a heat sink placed with a contact surface on the cooling surface of the electronic unit... ensuring a reliable and efficient heat dissipation by maintaining a parallel orientation of the heat sink's contact surface with the electronic unit's cooling surface

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250024583A1Electronic subassembly with improved mounting of a heat sink

Publication Date: 2025.01.16 SIEMENS AG

AI summary

An electronic subassembly includes an electronic unit arranged on a component side of a printed circuit board, a heat sink placed with a contact surface on a cooling surface of the electronic unit, a clip overlapping the heat sink and connected to the printed circuit board, and an auxiliary structure made of electrically insulating material and placed on the component side. The auxiliary structure includes a clip receiver in which the clip is introduced before placement of the auxiliary structure, and a heat sink receiver in which the heat sink is introduced before placement of the auxiliary structure and held and guided therein. The heat sink receiver includes retaining hooks to limit a movement of the heat sink in direction of the printed circuit board. The heat sink is spaced apart from the retaining hooks or pressed onto the retaining hooks by the clip while the auxiliary structure is bent.