Active MEMS Cooling Systems for Smartphones
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Solution Overview
Problem
Current cooling solutions for computing devices, such as smartphones and laptops, face challenges in effectively managing heat due to space and power constraints, with active cooling systems being too large and noisy, and passive systems inadequate for removing excessive heat generated by high-performance processors.
Innovation Solution
An active MEMS (Micro-Electro-Mechanical Systems) cooling system that utilizes vibrational motion to drive fluid flow for heat transfer, incorporating a centrally anchored cooling element with cantilevered arms and orifice plates to efficiently dissipate heat from heat-generating structures within compact devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling systems (fans) are used to drive air through computing devices, then heat dissipation is improved, but device size increases and noise is generated
Solution Approach 1:
The patent employs a vibrational cooling element that oscillates at high frequency to drive fluid flow through the device. This mechanical vibration mechanism replaces traditional rotating fans, enabling effective heat dissipation in a compact form factor without generating audible noise, thus resolving the contradiction between heat dissipation performance and device size.
Solution Approach 2:
The invention substitutes the traditional mechanical fan system with a vibrational mechanism that uses oscillating motion to propel fluid flow. This substitution eliminates the need for large rotating components and bearings, allowing the cooling system to be integrated into small portable devices while maintaining effective heat removal.
2Temperature
If active cooling systems are used to remove excessive heat, then heat dissipation is improved, but power consumption increases
Solution Approach 1:
The vibrational cooling element operates by oscillating at resonant frequencies to efficiently move fluid through the device with minimal power input. The resonant oscillation amplifies the fluid flow effect while consuming less energy compared to continuous rotation of traditional fans, thus resolving the contradiction between heat dissipation and power consumption.
3Temperature
If cooling systems are incorporated into mobile devices with limited interior cavity, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The cooling system is designed as a modular integrated structure where the vibrational cooling element, fluid channels, and heat exchange surfaces are combined into a single compact unit. This segmentation approach allows the entire cooling system to be installed within the limited interior cavity of mobile devices without requiring separate components, thus reducing integration complexity while maintaining heat dissipation effectiveness.
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 MEMS cooling system provides efficient heat transfer with high fluid speeds, reducing the boundary layer and enhancing heat dissipation, allowing for longer operation times and improved performance of high-speed processors without increased noise or power consumption.
Implementation Method 1
The active cooling cells are configured to utilize vibrational motion to drive a fluid for transferring heat from the heat-generating structure
Implementation Method 2
The cooling system is thermally coupled with the heat-generating structure
Data Source
AI summary
A mobile phone is described. The mobile phone includes a cover, a circuit board to which a heat-generating structure is coupled, and a cooling system including active cooling cell(s) and contained by the cover. The cover defines an interior of the mobile phone. The circuit board is within the interior. The heat-generating structure is thermally coupled with the cooling system. The active cooling cell(s) utilize vibrational motion to drive a fluid for transferring heat from the heat-generating structure. At least one of the mobile phone includes an interposer, the cover includes a raised portion, or the mobile phone includes a cavity therein. The interposer is coupled to the circuit board and includes a gap such that a first portion of the cooling system thermally coupled with the heat-generating structure resides within the gap. The raised portion of the cover is such that a second portion of the cooling system resides in the raised portion. The cavity includes the cooling system, separates the cooling system from the interior, and is such that the interior is water resistant.