AC Ionic Blower Electrode Layout for Thin Laptop Cooling
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Solution Overview
Problem
Thin and light computing devices face challenges in delivering high-performance processing due to increasing power densities, leading to elevated component temperatures and potential overheating issues, which existing fanless cooling systems struggle to address effectively, particularly concerning reliability and dust accumulation.
Innovation Solution
The implementation of an AC ionic blower system using ionic wind principles, where two offset electrodes separated by a dielectric material are driven with a high AC voltage to induce airflow without moving parts, reducing acoustic noise and minimizing dust accumulation risks, thus providing effective cooling for computing systems without the need for physical air movers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fan-based cooling systems are used, then cooling effectiveness is improved, but device thickness increases and acoustic noise increases
Solution Approach 1:
The patent replaces the mechanical fan-based cooling system with an AC ionic blower that uses ionic wind principles. This substitution eliminates moving mechanical parts while still achieving effective cooling, thereby reducing device thickness and acoustic noise while maintaining cooling effectiveness for high power density components
Solution Approach 2:
The patent employs ionic wind (a pneumatic phenomenon) to generate airflow for cooling. By using ionized air molecules to create thrust and move air across heat-generating components, the system achieves cooling without mechanical fans, thus reducing device thickness and acoustic noise
2Temperature
If fanless cooling systems are used, then acoustic noise is reduced, but reliability decreases due to dust accumulation on electrodes
Solution Approach 1:
The patent replaces mechanical fans with an AC ionic blower that has no moving parts, eliminating dust accumulation issues associated with fan blades while maintaining cooling effectiveness. The solid-state design improves reliability by removing mechanical failure points
Solution Approach 2:
The patent introduces a dielectric barrier as an intermediary between the electrodes and the air. This dielectric layer prevents direct contact between ions and the electrode surfaces, thereby preventing dust accumulation on electrodes while still enabling ionic wind generation for effective cooling
3Temperature
If larger fan cutouts are used, then cooling effectiveness is improved, but I/O signal speeds decrease due to larger signal path lengths
Solution Approach 1:
The patent replaces large mechanical fans with compact AC ionic blowers that generate sufficient airflow without requiring large fan cutouts. This reduction in cutout size shortens I/O signal path lengths and improves signal speeds while maintaining cooling effectiveness through ionic wind
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
This solution enables reliable and efficient cooling of up to 20 W of computing system power at a sub-ambient acoustic level, reducing the need for large fan cutouts and improving I/O signal speeds, while being more reliable and space-efficient compared to conventional fan-based systems.
Implementation Method 1
Laptop blower using ac ionic wind principles
Implementation Method 2
two offset electrodes separated by a dielectric material are driven with a high AC voltage to induce airflow
Data Source
AI summary
In one embodiment, an AC ionic blower apparatus includes a housing defining a hole through the housing, a first electrode formed around the hole, a second electrode formed around the hole, and a dielectric material between the first electrode and the second electrode. The center of the second electrode is offset from the center of the first electrode.