CN-122018648-A - Fan device and control method thereof

Abstract

A fan device and a control method thereof are provided, wherein the fan device comprises a motherboard, a control board electrically connected with the motherboard, and a plurality of fans electrically connected with the control board. The motherboard and the control board jointly execute a fan control method for driving the fan. The main board sends a time-division multiplexing control signal to the control board in a time-division multiplexing mode, the control board generates a plurality of driving signals according to the time-division multiplexing control signal and sends the driving signals to the fan to enable the fan to run, the invention respectively sends different control signals to different fans so as to enable the fans to radiate heat by using proper rotating speed, thereby achieving the effect of improving the utilization efficiency of the power supply.

Inventors

• LAI WENXIAN

Assignees

• 迎新科技(江苏)有限公司

Dates

Publication Date

20260512

Application Date

20241119

Priority Date

20241105

Claims (10)

1. 1. A fan control method is implemented by a motherboard and a control board electrically connected with the motherboard to drive a plurality of fans electrically connected with the control board, and is characterized in that: The main board transmits a time-division multiplexing control signal containing a plurality of fan control signals to the control board in a time-division multiplexing mode, wherein the fan control signals respectively correspond to the fans and are displayed in a pulse width modulation mode; The control board performs de-multiplexing on the time-division multiplexing control signal to obtain the fan control signal, and generates a plurality of driving signals in a pulse width modulation mode according to the fan control signal, respectively The control board outputs the driving signals to the fans respectively so that the fans rotate respectively according to the driving signals.
2. 2. The fan control method according to claim 1, characterized in that: the method comprises transmitting the time-division multiplexing control signal, wherein in one period of the time-division multiplexing control signal, the motherboard sequentially transmits the fan control signal and then transmits a control end signal which is presented in a pulse width modulation mode and corresponds to a working period of less than 20%; the demultiplexing of the time division multiplexed control signal includes determining the period of the time division multiplexed control signal based on the control endpoint signal to obtain the fan control signal.
3. 3. The fan control method according to claim 1, characterized in that: The control board receives a plurality of tachometer signals from the fans respectively, the tachometer signals respectively representing the rotational speeds of the fans, and The control board generates a plurality of fan rotating speed signals in pulse mode according to the rotating speed signals, and transmits a time-division multiplexing rotating speed signal containing the fan rotating speed signals to the mainboard in a time-division multiplexing mode.
4. 4. The method of claim 3, wherein the motherboard demultiplexes the TDM RPM signal to obtain the fan RPM signal, and determines a frequency of pulses in the fan RPM signal to obtain the rotational speed of the fan.
5. 5. A fan control method as claimed in claim 3, wherein: The transmission of the time-division multiplexing rotation speed signal comprises that the control board adds a constant to the maximum value of the rotation speed to form end point data, converts the end point data into a rotation speed end point signal which is presented in the form of pulse wave, and transmits the rotation speed end point signal after sequentially transmitting the fan rotation speed signal in one period of the time-division multiplexing rotation speed signal.
6. 6. A fan device is characterized by comprising A motherboard; a control board electrically connected with the motherboard, and A plurality of fans electrically connected with the control panel; The main board transmits a time-division multiplexing control signal containing a plurality of fan control signals to the control board in a time-division multiplexing mode, wherein the fan control signals respectively correspond to the fans and are displayed in a pulse width modulation mode; The control board performs de-multiplexing on the time-division multiplexing control signal to obtain the fan control signal, and generates a plurality of driving signals in a pulse width modulation mode according to the fan control signal, respectively The control board outputs the driving signals to the fans respectively so that the fans rotate respectively according to the driving signals.
7. 7. The fan apparatus of claim 6, wherein the motherboard sequentially transmits the fan control signal to the control board in a period of the TDM control signal, and then transmits a control endpoint signal to the control board, wherein the control endpoint signal is in a pulse width modulated form and corresponds to a duty cycle of less than 20%, and the control board determines the period of the TDM control signal according to the control endpoint signal to obtain the fan control signal.
8. 8. The fan apparatus of claim 6, wherein the control board receives a plurality of tachometer signals from the fan, the tachometer signals respectively representing rotational speeds of the fan, and the control board generates a plurality of fan tachometer signals in pulse form according to the tachometer signals respectively, and transmits a time-division multiplexed tachometer signal containing the fan tachometer signals to the motherboard in a time-division multiplexed manner.
9. 9. The fan apparatus of claim 8, wherein the motherboard demultiplexes the TDM RPM signal to obtain the fan RPM signal, and determines a frequency of pulses in the fan RPM signal to obtain the rotational speed of the fan.
10. 10. The fan apparatus of claim 8, wherein the control board adds a constant to the maximum value of the rotational speeds to form end point data, converts the end point data into a rotational speed end point signal in the form of pulses, and sequentially transmits the rotational speed end point signal to the motherboard after sequentially transmitting the rotational speed signal to the motherboard in one period of the time division multiplexed rotational speed signal.

Description

Fan device and control method thereof Technical Field The present invention relates to a fan device and a control method thereof, and more particularly, to a fan device for controlling a plurality of heat dissipation fans and a control method thereof. Background In recent years, as the speed and performance of the CPU (Central Processing Unit; CPU) has increased, the waste heat generated during operation has also increased. Current cpus rely heavily on heat removal systems to remove waste heat to operate within an operational temperature range. Meanwhile, more and more components are generated in the main casing of the computer, such as a display card, a memory, a hard disk and the like. Therefore, mounting a heat dissipation system in a computer main housing is a common waste heat removal means. Referring to fig. 1, a conventional heat sink 900 for a computer host (not shown) is installed in the computer host and includes a motherboard 91 (motherboard), and a plurality of fans 93 electrically connected to the motherboard 91 through a Fan Hub 92 (Fan Hub), wherein the fans 93 are installed in a plurality of different areas of the computer host. The motherboard 91 sends a control signal to the fan 93 through the fan hub 92, and the fan 93 rotates at the same rotation speed according to the control signal. However, the temperature rising condition of each area in the host computer is different, and the motherboard 91 can only send the control signal to all fans 93 synchronously, so that all fans 93 rotate synchronously according to the same control signal, and the rotation speed of the fans 93 cannot be adjusted according to the condition of each area in the host computer, which results in waste of power efficiency. Disclosure of Invention Therefore, if different control signals can be sent to different fans according to different heating conditions of each area, the fans can be enabled to dissipate heat by using proper rotation speeds, and therefore the utilization efficiency of the power supply is improved. One of the objectives of the present invention is to provide a fan control method for respectively sending different control signals to a plurality of fans, so that the fans can be operated at proper rotational speeds, thereby improving the utilization efficiency of the power supply. The fan control method is implemented by a motherboard and a control board electrically connected with the motherboard to drive a plurality of fans electrically connected with the control board, and comprises the following steps. The motherboard transmits a Time-division multiplexing (TDM) control signal containing a plurality of fan control signals to the control board in a Time-division multiplexing (TDM) mode, wherein the fan control signals respectively correspond to the fans and are presented in a Pulse-Width Modulation (PWM) mode. The control board performs demultiplexing on the time division multiplexing control signal to obtain the fan control signal, and generates a plurality of driving signals in a pulse width modulation mode according to the fan control signal. The control board outputs the driving signals to the fans respectively so that the fans rotate respectively according to the driving signals. The control method of the fan of the present invention, The method comprises transmitting the time-division multiplexing control signal, wherein in one period of the time-division multiplexing control signal, the motherboard sequentially transmits the fan control signal and then transmits a control end signal which is presented in a pulse width modulation mode and corresponds to a working period of less than 20%; the demultiplexing of the time division multiplexed control signal includes determining the period of the time division multiplexed control signal based on the control endpoint signal to obtain the fan control signal. The fan control method of the invention further comprises the following steps: The control board receives a plurality of tachometer signals from the fans respectively, the tachometer signals respectively representing the rotational speeds of the fans, and The control board generates a plurality of fan rotating speed signals in pulse mode according to the rotating speed signals, and transmits a time-division multiplexing rotating speed signal containing the fan rotating speed signals to the mainboard in a time-division multiplexing mode. The invention also includes that the motherboard performs de-multiplexing on the time-division multiplexing rotation speed signal to obtain the fan rotation speed signal, and judges the frequency of pulse wave in the fan rotation speed signal to obtain the rotation speed of the fan. The control method of the fan of the present invention, The transmission of the time-division multiplexing rotation speed signal comprises that the control board adds a constant to the maximum value of the rotation speed to form end point data, converts the end point data into a rotat