PCB Assembly Thermal Management via Gap Filler
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Solution Overview
Problem
Existing printed circuit board assemblies in field bus devices face challenges with heat dissipation due to the use of potting compounds, which can lead to overheating of electronic components.
Innovation Solution
A printed circuit board assembly that utilizes a gap filler to directly couple electronic components to the housing, establishing a thermal connection and serving as a barrier for the potting compound, thereby enhancing heat dissipation without fully embedding the board in the compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the printed circuit board is completely enclosed by potting compound, then the electronic components are protected against moisture, but heat dissipation is impaired leading to overheating
Solution Approach 1:
The patent divides the housing space into two distinct regions: a first region containing the printed circuit board enclosed by potting compound for moisture protection, and a second region containing the heat-generating electronic component with direct thermal contact to the housing for heat dissipation. This segmentation allows simultaneous achievement of both protection and cooling functions.
Solution Approach 2:
The heat-generating electronic component is extracted from the potting compound enclosure and placed in a separate second region that directly contacts the housing. This extraction removes the thermal barrier effect of the potting compound from the heat dissipation path while maintaining moisture protection for the circuit board in the first region.
2Reliability
If the printed circuit board is mounted via supports and completely enclosed by potting compound, then the board is protected, but heat has to be dissipated via the potting compound which is inefficient
Solution Approach 1:
The housing is segmented into a first region for the printed circuit board with potting compound protection and a second region for the electronic component with direct housing contact. This spatial segmentation creates separate thermal management zones, allowing efficient heat dissipation for power components while maintaining protective enclosure for the circuit board.
Solution Approach 2:
The housing itself serves as a thermal intermediary or heat sink for the electronic component in the second region. By providing direct thermal contact between the component and housing, the housing acts as an effective heat dissipation mediator, replacing the inefficient potting compound thermal path.
3Object-affected harmful factors
If potting compound is used to enclose the printed circuit board, then moisture protection is achieved, but the potting compound acts as thermal insulation preventing effective heat dissipation
Solution Approach 1:
The patent segments the device into two functional regions: the first region with potting compound for moisture protection and thermal isolation, and the second region with direct housing contact for efficient thermal conduction. This segmentation allows each region to optimize for its specific function without compromise.
Solution Approach 2:
Different regions of the device are assigned different thermal properties: the first region uses potting compound with insulating properties for moisture protection, while the second region establishes direct thermal contact with the housing for high thermal conduction. This local differentiation of material properties optimizes both protection and heat dissipation.
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 solution effectively prevents overheating by providing a defined cooling path, reduces the need for thermally conductive potting compounds, and lowers manufacturing costs while maintaining protection against moisture and mechanical stress.
Implementation Method 1
a heat conduction to the housing via the gap filler is established
Implementation Method 2
the gap filler also serves as a rest for the potting compound, as the potting compound cannot completely penetrate into the housing during the subsequent potting process
Data Source
AI summary
A printed circuit board assembly for a field bus device is described, comprising a housing, a printed circuit board, and at least one electronic component fastened to the printed circuit board. The printed circuit board is arranged in the housing. The housing has at least one bearing surface on which a gap filler is arranged, against which the electronic component rests so that the printed circuit board is mounted in the housing via the electronic component and the gap filler. A potting compound is provided, which covers the printed circuit board and contacts the gap filler.