3D-Printed Heat Shields for Thermally Sensitive PCB Components
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Solution Overview
Problem
Thermally sensitive components in Printed Circuit Board Assemblies (PCBAs) are prone to failure due to exposure to high temperatures during reflow and wave soldering processes, necessitating protection without interfering with the assembly process or causing contamination, while also being cost-effective and minimizing waste.
Innovation Solution
Customized 3D printed protective heat shields made from high-temperature grade plastic, designed to be reusable and positioned on thermally sensitive components before or after placement on the circuit board, providing thermal insulation during high-temperature processes such as reflow and wave soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermally sensitive components are exposed to high temperatures during reflow and wave soldering processes, then the soldering process can be completed, but the thermally sensitive components may fail due to exceeding their maximum temperature threshold
Solution Approach 1:
A heat shield is introduced as an intermediary component between the thermally sensitive component and the high-temperature environment. The heat shield absorbs and blocks excessive heat, allowing the soldering process to proceed while protecting the component from temperature damage. This mediator enables both the soldering process and component protection to coexist.
Solution Approach 2:
The heat shield is positioned on the thermally sensitive component before the high-temperature soldering process begins. This preliminary placement ensures protection is in place before thermal exposure occurs, preventing temperature damage while allowing the soldering process to complete successfully.
2Reliability
If protective measures are added to protect thermally sensitive components, then component protection is improved, but the assembly process complexity increases
Solution Approach 1:
The protective solution is segmented into individual heat shields for each thermally sensitive component rather than requiring a complex system-wide protection mechanism. Each component receives targeted protection independently, simplifying the overall assembly process while maintaining effective protection.
Solution Approach 2:
The heat shield is designed as a simple, inexpensive, single-use component that is discarded after one use. This eliminates the need for complex reusable protection systems with multiple components and complicated assembly/disassembly procedures, reducing overall process complexity while maintaining protection effectiveness.
3Reliability
If protective measures are implemented during high-temperature processes, then component protection is achieved, but contamination or damage to the PCBA may occur
Solution Approach 1:
The heat shield is constructed from a thin, flexible material that provides thermal protection without creating a bulky or complex structure. This thin-film approach allows the shield to be easily removed after use without leaving residues or causing contamination, while still effectively blocking excessive heat during the soldering process.
Solution Approach 2:
The heat shield is designed as a disposable component that is discarded after a single use, eliminating the risk of contamination from reusable components that would require cleaning and maintenance. This simple approach ensures no contamination or damage to the PCBA while maintaining effective protection during the high-temperature process.
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 protective heat shields effectively maintain the temperature of thermally sensitive components below their maximum threshold, preventing failure and allowing for cost-effective, non-invasive protection during PCBAs manufacturing, with the ability to be reused and avoid contamination.
Implementation Method 1
The customized protective heat shield is configured to thermally insulate the thermally-sensitive component from a high-temperature environment having a temperature above the maximum temperature threshold of the thermally-sensitive component
Data Source
AI summary
A method of manufacturing a printed circuit board assembly includes providing a circuit board, positioning a plurality of components including at least one thermally-sensitive component having a maximum temperature threshold on the circuit board, positioning a customized protective heat shield on the thermally-sensitive component, exposing the circuit board (having the thermally-sensitive component disposed thereon and the customized protective heat shield disposed on the thermally-sensitive component) to a high-temperature environment wherein temperatures exceed the maximum temperature threshold of the thermally-sensitive component, and removing the customized protective heat shield from the thermally-sensitive component. Customized protective heat shields are also provided.