Back Box Airflow Housing for Cooling Dense Electrical Circuitry
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Solution Overview
Problem
Electrical boxes face challenges in effectively managing the increased thermal load generated by denser electronic circuitry, as existing heat removal methods are insufficient for handling the rising heat generated by added features.
Innovation Solution
The solution involves a housing with vent holes and a fan hole configuration that allows a cooling fan to draw air through an intake opening, circulate it over the circuitry, and exhaust it through vent holes, with re-cooled air being recirculated to enhance heat removal, and additional heat dissipation through a metal front surface and thermal interface materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional and/or denser circuitry is added to support more features, then functionality and features are improved, but heat generation increases beyond the removal capability of known arrangements
Solution Approach 1:
The patent implements a dynamic cooling system with a cooling fan that actively adjusts air flow based on thermal conditions. The fan creates forced convection to dynamically remove heat from the circuit board, allowing the system to handle higher power densities and more features while maintaining safe operating temperatures. This dynamic thermal management enables increased circuitry density without being constrained by passive heat dissipation limits.
2Temperature
If a heat sink is provided to draw heat away from the circuitry, then heat removal is improved, but the heat removal capacity is insufficient for increased thermal load from denser circuitry
Solution Approach 1:
The patent employs pneumatic cooling by introducing a cooling fan that forces air flow across the circuit board. This pneumatic approach moves large volumes of air to enhance convective heat transfer, providing significantly higher heat removal capacity compared to passive heat sinks alone. The forced air flow system can handle the increased thermal load from denser circuitry by increasing the mass flow rate of cooling air.
Solution Approach 2:
The patent introduces cooling air as an intermediary medium between the heat-generating circuitry and the external environment. The cooling air acts as a heat carrier, absorbing thermal energy from the circuit board through convection and transporting it outside the enclosure. This intermediary approach enables more efficient heat removal compared to direct conduction through heat sinks alone.
3Temperature
If more heat must be drawn away from the circuitry to handle increased thermal load, then thermal management effectiveness is improved, but existing heat sink arrangements are insufficient
Solution Approach 1:
The housing structure serves multiple functions: it provides mechanical enclosure for the circuit board, incorporates heat sinks for passive heat dissipation, includes integrated fan mounting for active cooling, and provides mounting surfaces for electronic components. This multi-functional design achieves enhanced thermal management without proportionally increasing device complexity, as the housing itself becomes the thermal management system rather than requiring separate dedicated cooling components.
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 significantly improves thermal management by efficiently removing heat from the circuitry, preventing damage and maintaining optimal operating temperatures, even with increased circuit density.
Implementation Method 1
a cooling fan configured to draw cooling air through an intake opening in the back box and through the fan hole into the housing and over the electronic circuitry, the cooling air then exiting the housing through the plurality of vent holes
Implementation Method 2
a heating element disposed within the housing and configured to heat the fluid circulating through the channels
Implementation Method 3
the fluid circulating through the channels
Implementation Method 4
a phase change material disposed within the housing and configured to absorb or release heat as needed to maintain the electronic circuitry within an acceptable operating temperature range
Implementation Method 5
a heat sink is provided that is in thermal contact with the circuitry and draws heat away from the circuitry. The heat sink may further be in contact with one or more walls of the enclosure to permit the heat drawn from the circuitry to escape into the surrounding ambient
Data Source
AI summary
An apparatus cools electronic circuitry. A housing has surfaces configured to enclose the electronic circuitry and are mountable inside a cavity in a back box. At least one of the surfaces has a vent holes therein facing an exhaust opening in the back box when the housing is mounted inside the cavity. Another surface has a fan hole that faces an intake opening in the back box when the housing is mounted inside the cavity. A cooling fan is mounted onto the another surface and disposed over the fan hole. The cooling fan is configured to draw cooling air through the intake opening in the back box and the fan hole into the housing and over the electronic circuitry. The cooling air then exits the housing through the vent holes and thereafter exits the back box through the exhaust opening.