Extended Heat Frame for PCB Cooling in Ruggedized Cabinets
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Solution Overview
Problem
Ruggedized electronic systems with printed circuit boards (PCBs) face challenges in heat dissipation, particularly in high ambient temperature environments, as the heat conductive metal frames used in conventional designs often fail to efficiently transfer heat away from the PCBs, especially when exposed to severe conditions like those in desert environments.
Innovation Solution
The solution involves a circuit board assembly with a first mounting frame portion of standard size housing a PCB and a second mounting frame portion connected to it, which extends the heat transfer area through additional false board edges and multiple heat transfer components, creating a larger footprint for enhanced conduction and convection cooling without altering the PCB or heat frame dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional heat frame is used with standard PCB dimensions, then the PCB maintains standard geometry, but the heat dissipation capacity is insufficient in high ambient temperature environments
Solution Approach 1:
The mounting frame is divided into a first mounting frame portion that directly supports the PCB and a second mounting frame portion that extends beyond the PCB boundaries. This segmentation allows the heat transfer components to be distributed across a larger area while the PCB remains at standard size, resolving the contradiction between maintaining standard PCB geometry and increasing heat dissipation capacity.
2Temperature
If the heat frame area is increased to improve cooling, then heat removal capacity increases, but the PCB and frame dimensions deviate from standards
Solution Approach 1:
The second mounting frame portion is specifically designed to carry heat transfer components without requiring the entire assembly to exceed standard dimensions. This local expansion of functional area allows increased heat removal capacity while maintaining compatibility with standard PCB and mounting hole configurations.
3Strength
If a rigid heatsink structure is used to provide mechanical support at guide rails, then structural strength improves, but the PCB bends under vibration
Solution Approach 1:
The mechanical support function at the guide rails is extracted from the PCB and transferred to the second mounting frame portion with false board edges. This separation allows the rigid heatsink structure to provide structural strength without causing PCB bending, as the mounting frame assumes the mechanical loading while the PCB remains suspended.
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 effectively increases the heat removal capacity, allowing the PCB to operate within standard geometries while matching larger footprints for improved cooling, addressing mechanical concerns such as stiffness and vibration resistance, and enabling reuse in different mechanical footprints.
Implementation Method 1
heat conductive metal such as aluminum which is used to conductively transfer component heat from the PCB outward through the heat frame
Implementation Method 2
creating a conduction/convection cooling path away from the first mounting frame portion for removing heat generated by the PCB
Data Source
AI summary
A circuit board assembly for installation in a cabinet includes a first standards based size first mounting frame portion having a PCB mounted thereto. A second mounting frame portion is connected to the first mounting frame portion having no portion of the PCB connected thereto. A combination size of the first and second mounting frames defines a larger second standards based size. Multiple heat transfer components may be connected to the first or second mounting frame portion provide a conduction/convection cooling path. The first mounting frame portion may include a first false board edge and the second mounting frame portion includes one or more false board edge(s) positioned laterally and oppositely directed to the first false board edge. The first and second false board edges are slidably received in opposed slots created in a cabinet.