Fan control method and system

CN116398461BActive Publication Date: 2026-06-26SHANGHAI SHENXILING MICROELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI SHENXILING MICROELECTRONICS TECH CO LTD
Filing Date
2023-05-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, the fan speed acquisition time is long, the speed is uncertain when the host computer is malfunctioning, the host computer pin resources are consumed in large quantities, and the cable cost is high.

Method used

By detecting the resistance of the ALERT and FANFAIL pins during power-up, a clock signal is generated, the host computer's heartbeat line is monitored, and the period and duty cycle of the fan PWM signal are configured using registers. The fan RPM is directly calculated, reducing the division operations of the host computer and realizing real-time fan speed control.

Benefits of technology

It enables real-time provisioning of fan speed, reduces the overhead of host computer software resources, reduces the number of fan and host computer cables, monitors fan speed control when host computer malfunctions, and reduces system costs.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116398461B_ABST
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Abstract

The application provides a fan control method and system, comprising the following steps: S1, detecting the pull-up resistance of the ALERT pin and the FANFAIL pin during power-on and the clock generation circuit, and obtaining the period and duty cycle of the fan PWM signal during power-on according to the resistance value; S2, waiting for the host computer to configure the FanDCYReg register, and being in the initial state if the FanDCYReg register is not configured; S3, after the host computer configures the FanDCYReg register, the duty cycle of the fan PWM signal is determined by the FanDCYReg register, and the period is determined by the PWMFreqReg register, and the state is the normal state; S4, monitoring whether the heartbeat line of the host computer is abnormal, and if the heartbeat line is abnormal, the fan drive control mode is switched to the takeover state, otherwise, the state is the normal state; meanwhile, the pulse counting circuit directly gives the RPM speed value of the fan, and the bit width is 16, and the division operation of the host computer is not needed. The application can provide the speed RPM of the fan in real time, reduce the software resource cost of the host computer, reduce the cable between the fan and the host computer, and reduce the system cost.
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