Heat Sink Stud Mounting for Uniform Thermal Pad Compression
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Solution Overview
Problem
Existing heat dissipation structures for integrated circuits often fail to achieve optimal compression of thermal pads, leading to inefficient heat transfer, particularly with the thermal pad on the upper side being undercompressed and the lower side being overcompressed, due to manufacturing and assembly tolerance issues and structural deflection.
Innovation Solution
A heat dissipation structure that includes a heat sink with thermal pads on both sides, where the heat sink is pulled up with the circuit board using stud components to ensure appropriate compression of both thermal pads, maintaining a predetermined pressure and avoiding deflection, thereby enhancing heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the heat sink is fixed to the circuit board using conventional methods (screws, springs, or direct mounting), then the structure is simple and easy to manufacture, but the thermal pad compression becomes uneven due to manufacturing and assembly tolerances, resulting in poor heat transfer efficiency
Solution Approach 1:
The patent introduces a pressing member as an intermediary component between the heat sink and the circuit board. This pressing member applies uniform pressing force to the thermal pad, ensuring even compression across the entire thermal interface. The pressing member acts as a mediator that distributes the load uniformly, compensating for manufacturing tolerances and assembly variations, thereby achieving consistent thermal contact without increasing overall structural complexity.
Solution Approach 2:
The patent modifies the pressing force parameter by making it adjustable through the pressing member mechanism. By controlling the pressing force applied by the pressing member, the system can optimize thermal pad compression to achieve optimal thermal contact. This parameter adjustment capability allows the system to compensate for variations in manufacturing tolerances and assembly conditions, ensuring consistent heat transfer performance.
2Manufacturing precision
If the thermal pad is heavily compressed to improve heat transfer, then heat transfer efficiency improves, but the integrated circuit may be damaged or the thermal pad may deform permanently
Solution Approach 1:
The patent employs a spring member as part of the pressing mechanism, which provides dynamic and elastic pressing force. The spring can compress and rebound, maintaining consistent contact pressure while accommodating variations in assembly and thermal expansion. This dynamic characteristic allows the system to apply sufficient compression for optimal heat transfer without risking permanent damage to the integrated circuit or deformation of the thermal pad.
Solution Approach 2:
The spring member acts as a cushioning element that protects the integrated circuit from excessive compression forces. The elastic nature of the spring provides a buffer that prevents sudden or excessive pressing forces from reaching the integrated circuit, thereby protecting it from damage while still maintaining adequate compression for effective heat transfer.
3Reliability
If the heat dissipation structure uses a sealed casing design, then dustproof and moisture-proof properties are improved, but heat dissipation efficiency may be reduced due to restricted airflow
Solution Approach 1:
The patent replaces natural convection with forced convection by introducing a fan. The fan actively drives air flow through the heat dissipation structure, ensuring efficient heat removal from the heat sink fins. This mechanical substitution allows the sealed casing to maintain its protective properties while achieving effective heat dissipation through controlled air circulation rather than relying on passive natural convection.
Solution Approach 2:
The heat dissipation structure integrates multiple functions within the sealed casing: the heat sink provides thermal conduction and convection surfaces, the fan provides forced air circulation, and the sealed structure provides environmental protection. This multi-functional integration allows the system to simultaneously achieve dustproof/moisture-proof properties and efficient heat dissipation without requiring separate systems.
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 ensures excellent heat dissipation performance by maintaining optimal compression of both thermal pads, improving the overall heat transfer efficiency and reducing manufacturing and assembly complexity.
Implementation Method 1
a thermal pad is disposed between a surface of the integrated circuit and one surface of the heat sink so as to efficiently conduct heat generated from the integrated circuit to the heat sink
Implementation Method 2
The heat transferred from the integrated circuit to the heat sink is transferred to air (refrigerant) inside the casing by natural air cooling using the heat sink or forced air cooling using a fan
Implementation Method 3
the heat is transferred from the inside of the casing to the outside of the casing by natural air cooling or forced air cooling
Data Source
AI summary
This heat dissipation structure includes: a circuit board; an integrated circuit mounted thereon; a first thermal pad disposed on the surface of the integrated circuit; a heat sink having a first surface that applies pressure to the first thermal pad by sandwiching the first thermal pad together with the surface of the integrated circuit and a second surface facing the first surface; a second thermal pad disposed on the second surface; a heat dissipation casing having a surface that applies pressure to the second thermal pad by sandwiching the second thermal pad together with the second surface; and stud components for pulling up the heat sink from the heat dissipation casing side together with the circuit board such that the second thermal pad is sandwiched and pressurized between the heat dissipation casing and the heat sink.