PoE Cooling Fan with Local Temperature-Based Speed Control
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Solution Overview
Problem
Existing fan systems in Ethernet devices require additional power sources and lack local control mechanisms, limiting their efficiency and flexibility.
Innovation Solution
A Power over Ethernet (PoE) cooling fan that harnesses power from Ethernet data lines and adjusts speed based on local temperature sensors, with optional battery backup for intermittent power demands, and communicates fan operation through Ethernet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fan systems are used in Ethernet devices, then cooling function is provided, but additional power sources and control mechanisms are required, increasing device complexity
Solution Approach 1:
The patent combines the power supply and control functions into the existing Ethernet infrastructure. The PoE cooling fan draws power from PoE ports and receives control commands through Ethernet communication, merging previously separate power sources and control systems into a unified network-based solution, thereby reducing overall device complexity while maintaining reliable cooling functionality
Solution Approach 2:
The cooling fan system is designed to utilize the multi-functionality of Ethernet connections, which can simultaneously provide both power delivery (via PoE) and control communication (via network protocols). This universal approach allows a single Ethernet infrastructure to fulfill multiple roles, eliminating the need for dedicated power supplies and control circuits
2Use of energy by moving object
If PoE power is used to power the fan, then power consumption is reduced, but fan speed control must be adjusted based on available power, potentially limiting cooling performance
Solution Approach 1:
The system implements dynamic adaptation by continuously monitoring available PoE power and adjusting fan speed accordingly. The controller modulates fan operation based on real-time power availability, ensuring optimal performance within power constraints. This dynamic behavior allows the system to maximize cooling effectiveness while respecting the limited power supply from PoE infrastructure
Solution Approach 2:
The system employs feedback mechanisms where the controller monitors both power availability from PoE ports and temperature conditions, then adjusts fan speed to balance power consumption with cooling requirements. This closed-loop control ensures that the fan operates efficiently within power limits while maintaining adequate cooling performance
3Productivity
If local temperature control is implemented, then cooling efficiency is improved, but additional sensors and control circuits are needed, increasing device complexity
Solution Approach 1:
The cooling fan system performs self-service by autonomously monitoring local temperature through integrated sensors and automatically adjusting its operation accordingly. The fan controller independently processes temperature data and modulates fan speed without requiring external control systems, thereby improving cooling efficiency while minimizing additional complexity through self-contained functionality
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
Enables efficient, locally controlled cooling with reduced power consumption and real-time monitoring, enhancing device cooling efficiency and flexibility.
Implementation Method 1
power to the fan is from a portion of the power to the Ethernet that is stolen or otherwise parasitically harvested
Implementation Method 2
The speed of the fan can also be adjusted based on a local temperature sensor
Data Source
AI summary
Improvements in a cooling fan are disclosed where power to the fan is provided by the Ethernet connection. The fan module is connected to the Ethernet such that power to the fan is from a portion of the power to the Ethernet is stolen or otherwise parasitically harvested. Depending upon the available Ethernet power, the fan can be powered directly, or from a storage supply such as a battery. The speed of the fan can also be adjusted based on a local temperature sensor. Measuring a local temperature provides the best indicator for when air movement and air volume is needed. The temperature sensor can be located on a specific device, housing or in the air around the fan. Fan speed and the temperature to be communicated to other devices or a host over the Ethernet or to a cloud-based application or database.