Top Chamber Cavities in Center-Pinned Actuators to Limit Backflow

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Solution Overview

Problem

Existing cooling systems for computing devices, such as fans and passive heat spreaders, are inadequate for both mobile and larger devices, leading to excessive heat generation and performance throttling, especially as semiconductor devices increase in power and 5G technology advances.

Innovation Solution

A micro-electro-mechanical system (MEMS) cooling system with a centrally anchored actuator and cavities in the upper chamber, which drives fluid through vibrational motion to efficiently cool heat-generating structures using a flow chamber configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional cooling devices (fans or heat spreaders) are used, then the device structure is simple, but they are unable to adequately cool both mobile devices and larger devices, leading to excessive heat generation

Engineering Contradiction:

Improvecooling effectivenessVSAvoidapplicability to different device sizes

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The cooling system is divided into an upper chamber and a lower chamber separated by a partition wall with openings. This segmentation allows independent optimization of each chamber's function while working together to provide effective cooling across different device sizes and configurations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The actuator is positioned within the lower chamber, nested between the partition wall and the bottom surface. This nested configuration allows the actuator to efficiently utilize the space within the cooling device while maintaining effective fluid drive between the chambers.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Temperature

If a fluid drive cooling system with actuator is implemented, then cooling effectiveness improves, but device complexity increases

Engineering Contradiction:

Improvecooling effectivenessVSAvoidsystem structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The actuator is extracted and positioned specifically within the lower chamber, separate from the upper chamber components. This extraction allows the actuator to be optimized for fluid generation without interfering with the upper chamber's fluid drive function, reducing overall system complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The partition wall with openings serves as an intermediary structure between the upper and lower chambers. It facilitates controlled fluid interaction between chambers while providing structural support and defining the boundaries of each functional zone.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of stationary object

If the actuator is positioned close to the top wall, then the upper chamber volume is maximized, but backflow increases and cooling efficiency decreases

Engineering Contradiction:

Improveupper chamber volumeVSAvoidfluid backflow

Core Design Contradiction:

Volume of stationary objectVSLoss of energy

Solution Approach 1:

The partition wall is positioned asymmetrically within the cooling device, creating an optimized distance relationship between the actuator in the lower chamber and the upper chamber. This asymmetric configuration maximizes upper chamber volume while maintaining sufficient separation to prevent backflow and ensure efficient fluid drive.

Inventive Principle:

Principle #4Asymmetry

4Loss of energy

If the distance between actuator and top wall is increased, then backflow is minimized, but the upper chamber volume and cooling efficiency are reduced

Engineering Contradiction:

Improvefluid backflowVSAvoidcooling efficiency

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The distance between the actuator and the top wall is optimized to specific parameter ranges. This parameter optimization achieves the right balance between minimizing backflow losses and maintaining sufficient upper chamber volume for effective cooling, thereby maximizing overall cooling efficiency.

Inventive Principle:

Principle #35Parameter changes

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 system effectively cools heat-generating structures in devices with limited space by achieving high fluid speeds and minimizing backflow, reducing thermal throttling and enhancing device performance.

Implementation Method 1

The actuator is configured to undergo vibrational motion when activated to drive the fluid from the upper chamber to the lower chamber

Methodology Applied

Scientific EffectVibrational motion: Vibration

Implementation Method 2

The top wall includes at least one cavity therein

Methodology Applied

Scientific EffectCavity structure effect:

Data Source

PatentUS20250327634A1Top chamber cavities for center-pinned actuators

Publication Date: 2025.10.23 FRORE SYSTEMS INC

AI summary

A flow chamber, a cooling system and a method are described. The flow chamber includes an upper chamber including a top wall, an actuator, and a lower chamber. The actuator is located distally from the top wall. The lower chamber receives fluid from the upper chamber when the actuator is actuated. The top wall includes at least one cavity therein. The cooling system utilizes cooling cells including the flow chamber. The method includes driving the actuator at a frequency that directs fluid through the flow chamber.