Fan Control System Dynamic Power Switching Standby Stability
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Solution Overview
Problem
Conventional fan control systems in computer devices face instability and inadequate heat dissipation when in standby mode due to insufficient AUX power and single power-driven fans, leading to potential faults and reduced heat dissipation efficiency upon returning to runtime state.
Innovation Solution
A fan control system comprising a board management unit, power control module, and rotation speed switching module that dynamically switches between AUX and main power, and adjusts fan rotation speed based on power supply conditions to maintain efficient heat dissipation in both standby and runtime states, with an auxiliary monitoring mechanism to prevent failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotation speed is set high by the BMC in standby state, then the heat dissipation effect is improved, but the AUX power is insufficient and causes power supply unit reset
Solution Approach 1:
The patent changes the power supply parameter from single AUX power to dual power sources (AUX power and main power) for the fan motor. The power control module dynamically selects and switches between power sources based on system state, allowing the fan to receive sufficient power for high-speed operation during standby state without causing AUX power insufficiency or reset.
2Device complexity
If the fan is driven by a single AUX power, then the device complexity is reduced, but the heat dissipation requirement in runtime state is not met
Solution Approach 1:
The patent makes the fan motor capable of operating under multiple power supply modes (AUX power only, AUX power plus main power). The power control module determines the appropriate power configuration based on system state, enabling the same fan hardware to meet both standby state power constraints and runtime state heat dissipation requirements without requiring separate fan systems.
3Ease of operation
If the fan rotation speed is automatically controlled by BMC, then the ease of operation is improved, but faults occur due to power insufficiency
Solution Approach 1:
The patent introduces a power control module as an intermediary between the BMC and the fan motor. This module receives the rotation speed instruction from the BMC, determines the appropriate power source configuration, and controls the fan motor accordingly. It also provides feedback to the BMC about the actual operating state, enabling reliable automatic control by mediating the power delivery to prevent insufficiency-induced faults.
Data Source
AI summary
A fan control system and a method thereof are applicable to a computer device. The system includes a fan, a board management unit, a power control module and a rotation speed switching module. The fan is driven by a control power and a rotation speed control signal. The board management unit provides a fan enabling signal, a rotation speed switching signal and a first fan rotation speed signal in a standby state. The power control module receives the fan enabling signal to determine whether to provide the control power to the fan, and switches between an auxiliary power or a main power served as the control power to the fan. The rotation speed switching module receives the rotation speed switching signal to accordingly switch between the first fan rotation speed signal or a second fan rotation speed signal served as the rotation speed control signal to the fan.