MEMS Virtual Valve Cooling for Compact Low-Noise Heat Dissipation
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Solution Overview
Problem
Current cooling solutions for computing devices, such as fans and passive cooling systems, are inadequate for effectively managing heat in both mobile and larger devices, leading to performance throttling and noise issues due to insufficient airflow and heat transfer.
Innovation Solution
An active cooling system utilizing piezoelectric MEMS elements with dynamic flow resistance modulation through passive and active vents, which vibrate to direct fluid towards heat-generating structures, creating virtual valves that enhance airflow and heat dissipation without physical closure, maintaining resonance and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling devices such as fans are used to drive air through computing devices, then heat dissipation capability is improved, but device size increases and noise is generated
Solution Approach 1:
The patent employs piezoelectric MEMS elements that vibrate at resonant frequencies to drive fluid flow through the cooling system. This vibrational mechanism replaces traditional rotating fans, enabling effective heat dissipation in a compact form factor without generating significant noise, thus resolving the contradiction between heat dissipation capability and device size/complexity
Solution Approach 2:
The system utilizes fluid dynamics principles where vibrating MEMS elements create pressure differentials to drive air flow through channels. By leveraging pneumatic principles rather than mechanical rotation, the system achieves fan-like cooling performance in a miniaturized configuration suitable for mobile devices
2Temperature
If active cooling devices such as fans are used, then heat dissipation capability is improved, but noise is generated
Solution Approach 1:
The patent employs piezoelectric MEMS elements that vibrate at resonant frequencies to drive fluid flow through the cooling system. This vibrational mechanism replaces traditional rotating fans, enabling effective heat dissipation in a compact form factor without generating significant noise, thus resolving the contradiction between heat dissipation capability and device size/complexity
Solution Approach 2:
The system replaces the mechanical rotation system of traditional fans with a vibrational system using piezoelectric MEMS actuators. This substitution eliminates the noise associated with rotating blades while maintaining effective fluid drive for heat dissipation
3Device complexity
If passive cooling devices such as heat spreaders are used, then device size is reduced, but heat dissipation capability is insufficient
Solution Approach 1:
The patent introduces dynamic fluid drive using vibrating MEMS elements that actively modulate flow resistance and drive fluid toward heat-generating structures. This dynamic approach transforms passive heat spreaders into active cooling systems, enhancing heat dissipation capability while maintaining the compact size advantage of passive devices
Solution Approach 2:
The system employs periodic vibrations at resonant frequencies to drive fluid flow through the cooling channels. This periodic action creates sustained convection currents that significantly enhance heat transfer from the heat spreader, combining the size benefits of passive cooling with the performance of active cooling
4Productivity
If computing devices operate at higher speeds, then computing power increases, but heat generation increases
Solution Approach 1:
The system incorporates flow resistance modulation that responds to thermal conditions, dynamically adjusting fluid flow to maximize heat dissipation efficiency. This feedback mechanism ensures that cooling performance scales with computing power and heat generation, enabling sustained high-speed operation
Solution Approach 2:
The vibrating MEMS elements create enhanced convective heat transfer that scales with operational demands, allowing the system to effectively manage heat from high-power computing operations while maintaining compact device dimensions
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 active cooling system efficiently dissipates heat, allowing devices to operate at higher speeds and longer durations with reduced noise and power usage, suitable for both mobile and non-mobile devices by thinning the boundary layer and improving heat transfer.
Implementation Method 1
An active cooling system utilizing piezoelectric MEMS elements with dynamic flow resistance modulation
Implementation Method 2
which vibrate to direct fluid towards heat-generating structures
Implementation Method 3
maintaining resonance and reducing power consumption
Implementation Method 4
by thinning the boundary layer and improving heat transfer
Implementation Method 5
improving heat transfer
Data Source
AI summary
An active cooling system includes at least one cooling element that has a vent therein. The active cooling element is in communication with a fluid. The cooling element(s) are actuated to vibrate to drive the fluid toward a heat-generating structure and to alternately open and close at least one virtual valve corresponding to the vent. The virtual valve is open for a low flow resistance and closed for a high flow resistance. The vent remains physically open when the virtual valve is closed.