Piezoelectric MEMS Array Cooling for Mobile Device Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cooling solutions for mobile devices, such as smartphones and tablets, are inadequate in addressing the heat dissipation needs of high-performance processors, leading to throttling and reduced performance due to insufficient heat transfer, especially as technology advances to 5G and beyond.
Innovation Solution
A two-dimensional array of piezoelectric MEMS-based cooling elements that are spatially arranged and driven by a communications interface and driving circuitry, allowing for selective activation based on heat energy generated, utilizing vibrational motion to efficiently transfer heat through fluid flow across the surface of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling solutions (heat spreader, heat pipe, vapor chamber) are used, then heat transfer is provided, but the amount of heat transfer is insufficient to address excessive heat generated by high-performance processors
Solution Approach 1:
The cooling system is divided into multiple independently addressable piezoelectric MEMS cooling elements arranged in a two-dimensional array. Each element can be selectively activated based on local heat generation, providing distributed and targeted cooling across the processor surface, thereby significantly increasing overall heat transfer capability.
Solution Approach 2:
Piezoelectric MEMS elements are driven to vibrate at high frequencies, creating micro-scale fluid flow and enhancing convective heat transfer. The vibrational motion disrupts thermal boundary layers and increases heat exchange efficiency between the cooling elements and the surrounding fluid, enabling superior heat dissipation performance.
2Temperature
If electric fans are used for cooling, then air flow is provided, but the fans are too large for mobile devices and generate excessive noise
Solution Approach 1:
The patent replaces traditional mechanical fan systems with piezoelectric MEMS-based cooling elements that use piezoelectric actuation to generate cooling effects. This substitution eliminates the need for large rotating mechanical components, enabling miniaturization suitable for mobile devices while reducing noise through solid-state operation.
Solution Approach 2:
The cooling system operates at the micro-scale with piezoelectric elements vibrating at high frequencies, fundamentally changing the operational parameters from macro-scale continuous air flow to micro-scale vibrational cooling. This parameter transformation enables compact integration in mobile devices while maintaining effective heat dissipation.
3Productivity
If processors operate at high clock speeds, then performance is improved, but heat generation increases causing throttling
Solution Approach 1:
The cooling system incorporates temperature sensors that continuously monitor heat generation at different locations on the processor. Based on this feedback, the control system selectively activates specific piezoelectric MEMS cooling elements to provide targeted cooling where heat is generated, enabling sustained high-performance operation without throttling.
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 solution effectively dissipates heat more efficiently than traditional methods, allowing devices to operate at higher speeds for longer periods without throttling, improving performance while being quiet and power-efficient, suitable for use in mobile devices with limited space.
Implementation Method 1
piezoelectric MEMS-based active cooling devices
Data Source
AI summary
A cooling system and method for using the cooling system are described. The cooling system includes a plurality of individual piezoelectric cooling elements spatially arranged in an array extending in at least two dimensions, a communications interface and driving circuitry. The communications interface is associated with the individual piezoelectric cooling elements such that selected individual piezoelectric cooling elements within the array can be activated based at least in part on heat energy generated in the vicinity of the selected individual piezoelectric cooling elements. The driving circuitry is associated with the individual piezoelectric cooling elements and is configured to drive the selected individual piezoelectric cooling elements.