Multiplex Switch for Cooling Fan Module Control
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Solution Overview
Problem
Conventional computing systems face challenges in efficiently controlling cooling fan modules due to the need for numerous wires and complex connections between the baseboard management controller (BMC) and multiple cooling fans, leading to inefficiencies in heat management and potential system failures.
Innovation Solution
The use of a multiplex switch that connects a controller (BMC or RMC) to multiple cooling fan modules, enabling selection, monitoring, and power control of specific fan modules through three connection links: a fan selection link, a fan monitoring link, and a fan power control link, utilizing MOSFETs and logic chips for efficient operation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a baseboard management controller directly connects to control pins of each cooling fan, then each fan can be controlled individually, but a large number of wires are required connecting the BMC to various cooling fans
Solution Approach 1:
The patent introduces a multiplexer as an intermediary device between the BMC and multiple cooling fans. The multiplexer receives control signals from the BMC via a single control line and routes them to the appropriate fan modules, eliminating the need for separate control wires to each fan. This mediator approach resolves the contradiction by maintaining individual fan control capability while dramatically reducing wire quantity.
Solution Approach 2:
The multiplexer performs multiple functions: it acts as a signal router for control commands, a monitoring interface for fan status, and a power control switch. By consolidating these functions into a single device that interfaces with the BMC through minimal connections, the system achieves comprehensive fan management without proportional increase in wiring complexity.
2Reliability
If multiple separate control connections are made to each cooling fan, then precise control is achieved, but the system becomes more complex and difficult to maintain
Solution Approach 1:
The patent merges multiple control functions (selection, monitoring, power control) and multiple fan control lines into a single integrated multiplexer device. This consolidation maintains precise control over individual fans through logical addressing while physically combining all control pathways into one manageable interface, thereby reducing structural complexity without sacrificing control precision.
3Adaptability or versatility
If conventional direct control methods are used for cooling fans, then each fan operates independently, but the system requires numerous wires and complex connections
Solution Approach 1:
The multiplexer serves as an intelligent intermediary that enables individual fan control through minimal wiring. It receives addressing signals from the BMC, identifies the target fan module, and establishes appropriate control pathways dynamically. This allows the system to maintain adaptability for controlling any individual fan while the physical wiring complexity remains low and fixed.
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 allows for simplified and efficient control of multiple cooling fan modules, reducing the complexity of connections and improving heat management within computing systems, thereby preventing overheating and system failures.
Implementation Method 1
The multiplexer switches can enable the controller to select a specific cooling fan module from the plurality of cooling fan modules. Once the specific cooling fan module is selected, the multiplexer switches can connect to the specific cooling fan module
Implementation Method 2
The multiplexer switches can include a plurality of MOSFETs. Each of the plurality of MOSFETs is connected to a corresponding one of the plurality of cooling fan modules. The controller can select and connect to a specific cooling fan module by switching on a corresponding MOSFET of the specific cooling fan module
Implementation Method 3
The controller can control power or current being delivered to the specific cooling fan module by sending a pulse-width-modulation (PWM) signal to the specific cooling fan module
Data Source
AI summary
The present disclosure provides a system and method for controlling a plurality of cooling fan modules using a management controller and a multiplex switch. The multiplex switch connects the management controller to the plurality of cooling fan modules. The multiplex switch can enable the management controller to select a specific cooling fan module from the plurality of cooling fan modules. Once the specific cooling fan module is selected, the multiplex switch can connect to the specific cooling fan module, enable the management controller to monitor operating characteristics of the specific cooling fan module, and control power or current being delivered to the specific cooling fan module.