MEMS Cooling Resonance Lock for Compact Heat Dissipation
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Solution Overview
Problem
Existing cooling technologies, such as fans and passive heat spreaders, are inadequate for effectively managing heat in both mobile and larger computing devices, leading to performance throttling and inefficiencies due to space, power, and configuration limitations.
Innovation Solution
An active MEMS cooling system with a drive system that adjusts frequency and input voltage based on resonant states to optimize the vibration of piezoelectric cooling elements, providing efficient fluid flow for heat management in confined spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling devices such as fans are used, then heat dissipation capability is improved, but device size and power consumption increase
Solution Approach 1:
The patent employs ultrasonic vibration of a membrane structure to generate acoustic streaming effects that drive fluid flow for cooling. The membrane vibrates at ultrasonic frequencies (20-100 kHz) to create rectified fluid flow without requiring traditional rotating fan mechanisms, thereby achieving active cooling in a compact form factor.
Solution Approach 2:
The invention replaces traditional mechanical rotating fan systems with an ultrasonic vibration-based acoustic streaming system. This substitution eliminates the need for rotating components, bearings, and large motor structures, enabling active cooling in space-constrained mobile devices while reducing power consumption.
2Temperature
If traditional fans are used for cooling, then heat dissipation is improved, but power consumption increases
Solution Approach 1:
The system uses ultrasonic vibration at high frequencies to generate acoustic streaming, which creates efficient fluid flow for heat dissipation. The ultrasonic frequency range (20-100 kHz) enables effective cooling with lower power input compared to traditional low-frequency fan systems, as the high-frequency vibrations create more efficient momentum transfer to the fluid.
Solution Approach 2:
The invention changes the operating parameters from traditional low-frequency mechanical rotation to high-frequency ultrasonic vibration. This parameter change fundamentally alters the fluid dynamics mechanism from pressure-driven flow to acoustic streaming, achieving superior cooling efficiency per unit of power consumed.
3Volume of moving object
If passive cooling devices are used, then device size is reduced, but heat dissipation capability becomes insufficient
Solution Approach 1:
The patent implements ultrasonic vibration of the cooling membrane to generate acoustic streaming effects that actively drive fluid flow across the heat-generating surface. This active vibration-based approach provides enhanced heat dissipation capability compared to passive cooling, while maintaining a compact form factor suitable for mobile devices.
Solution Approach 2:
The invention utilizes acoustic streaming - a fluid dynamic phenomenon where ultrasonic waves create rectified flow patterns in the fluid. This pneumatic/hydraulic effect generates active fluid circulation for heat dissipation without mechanical contact, achieving effective cooling in a compact configuration.
4Temperature
If cooling systems are optimized for high performance, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The cooling membrane serves multiple functions: it acts as both the ultrasonic vibration source and the cooling surface in contact with heat-generating components. This multi-functionality eliminates the need for separate actuators and cooling plates, reducing system complexity while maintaining high heat dissipation performance.
Solution Approach 2:
The invention merges the actuation mechanism and cooling surface into a single integrated membrane structure. The ultrasonic vibration is generated directly at the cooling surface, combining the functions of the actuator and heat exchange interface, thereby simplifying the overall system architecture.
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 achieves high-speed fluid flow for effective heat dissipation in computing devices, reducing power consumption and overcoming space constraints while maintaining device performance.
Implementation Method 1
vibration of piezoelectric cooling elements
Implementation Method 2
adjusts frequency and input voltage based on resonant states to optimize the vibration
Data Source
AI summary
A system includes an active micro-electric mechanical system (MEMS) cooling system and a drive system. The MEMS cooling system includes cooling element(s) that direct fluid toward a surface of heat-generating structure(s) when driven to vibrate by a driving signal having a frequency and an input voltage. The drive system is coupled to the active MEMS cooling system and provides the driving signal. The drive system includes a power source and a feedback controller providing a feedback signal corresponding to a proximity to a resonant state of the at least one cooling element. The drive system adjusts at least one of the frequency and the input voltage based on the feedback signal such that the frequency corresponds to the resonant state of the cooling element(s). The input voltage does not exceed a maximum safe operating voltage for the cooling element(s).