US 11,719,251 B2
Fan control system, method and server wherein PWM pin and TACH pin are utilized to control a fan based on a mode control instruction
Yong Li, Jiangsu (CN)
Assigned to INSPUR SUZHOU INTELLIGENT TECHNOLOGY CO., LTD, Jiangsu (CN)
Appl. No. 17/281,592
Filed by INSPUR SUZHOU INTELLIGENT TECHNOLOGY CO., LTD, Jiangsu (CN)
PCT Filed Jul. 31, 2019, PCT No. PCT/CN2019/098547
§ 371(c)(1), (2) Date Mar. 31, 2021,
PCT Pub. No. WO2020/224067, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 201910384769.0 (CN), filed on May 9, 2019.
Prior Publication US 2021/0396239 A1, Dec. 23, 2021
Int. Cl. G06F 1/20 (2006.01); F04D 27/00 (2006.01); G05B 19/045 (2006.01)
CPC F04D 27/008 (2013.01) [G05B 19/045 (2013.01); G06F 1/206 (2013.01); G05B 2219/25268 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A system for controlling a fan, wherein the system is applied to a server, and comprises a processor, a driver, a power supply module, an instruction output module and a level control module, wherein
the power supply module is configured to supply power to the level control module when the server is started up and when the server is shut down;
the instruction output module is configured to output a mode control instruction, wherein the mode control instruction comprises a start-up mode instruction and a shut-down mode instruction;
the level control module is connected with the instruction output module, the power supply module, a Pulse Width Modulation (PWM) pin and a Tachometer (TACH) pin of the processor and is configured to, on reception of the mode control instruction, output a first level to the PWM pin and output a second level to the TACH pin based on the mode control instruction and then control the power supply module to supply power to the processor and the driver; and
the processor is configured to, after being powered on, determine a mode of the fan based on the first level and the second level and control a rotation speed of the fan through the driver and based on the mode of the fan, wherein
the level control module is configured to, on reception of the start-up mode instruction or the shut-down mode instruction, output the first level with a first predetermined duration to the PWM pin, output the second level with the first predetermined duration to the TACH pin, and control the power supply module to supply power to the processor and the driver in a process of outputting the first level and the second level.