Noise reduction circuit, host and noise reduction method

Abstract

The invention provides a noise reduction circuit, a host and a noise reduction method. The noise reduction circuit comprises a main control module, a switch module, a connection module and a fan control module. The main control module is connected with the BIOS module of the host and is used for detecting whether the BIOS module is initialized or not; one end of the switch module is connected with the main control module, and the switch module is connected and disconnected according to a control signal of the main control module; one end of the connecting module is connected with the other end of the switch module; one end of the fan control module is connected with the main control module, and the other end of the fan control module is connected with the switch module and the connection module. And if the main control module detects that the BIOS module does not finish initialization, the main control module outputs a control signal to switch the state of the switch module so as to interrupt the control of the fan control module on the fan module and close the fan module. The noise generated when the host is started can be reduced, and the use experience of a user is improved.

Description

Technical Field

[0001] This invention relates to the field of computer technology, specifically to a noise reduction circuit, a host computer, and a noise reduction method. Background Technology

[0002] Computer hosts are typically equipped with fans to improve heat dissipation and ensure the normal operation of the hardware components. Traditional fan control methods involve hardware-driven operation followed by software control. That is, the fan starts simultaneously when the host is powered on, and the BIOS only takes over fan control and adjusts the fan speed after the BIOS program has completed initialization. However, before the BIOS program has finished initializing, the fan usually starts at full speed, resulting in significant startup noise and a reduced user experience. Summary of the Invention

[0003] This invention provides a noise reduction circuit, a host computer, and a noise reduction method, aiming to solve the problem of excessive fan noise in current host computers when they are first started.

[0004] In a first aspect, the present invention provides a noise reduction circuit applied to a host computer. The noise reduction circuit includes a main control module, a switch module, a connection module, and a fan control module. The main control module is connected to the host computer's BIOS module and is used to detect whether the BIOS module has completed initialization. One end of the switch module is connected to the main control module and is used to turn the switch on and off according to the control signal from the main control module. One end of the connection module is connected to the other end of the switch module. One end of the fan control module is connected to the main control module, and the other end of the fan control module is connected to both the switch module and the connection module. If the main control module detects that the BIOS module has not completed initialization, it outputs a control signal to switch the state of the switch module to interrupt the fan control module's control of the fan module and thus shut down the fan module.

[0005] Furthermore, the switching module includes a first switching element, a first controlled electrode of the first switching element connected to the main control module, a second controlled electrode of the first switching element connected to the fan control module, a first electrode of the first switching element grounded, a second electrode of the first switching element connected to the power supply terminal, a third electrode of the first switching element connected to the fan control module, and a fourth electrode of the first switching element grounded.

[0006] Furthermore, the switching module also includes a first resistor and a second resistor; one end of the first resistor is connected to the main control module, and the other end of the first resistor is connected to the first controlled electrode of the first switching element; one end of the second resistor is connected to the power supply terminal, and the other end of the second resistor is connected to the second electrode and the second controlled electrode of the first switching element respectively.

[0007] Furthermore, the switching module also includes a third resistor; one end of the third resistor is connected to the second controlled electrode of the first switching element, and the other end of the third resistor is connected to the fan control module.

[0008] Furthermore, the switching module also includes a fourth resistor; one end of the fourth resistor is connected to the third terminal of the first switching element, and the other end of the fourth resistor is connected to the fan control module.

[0009] Furthermore, the speed control module includes a speed control chip, which includes a control pin and a feedback pin. The control pin is connected to the second controlled electrode and the third electrode of the first switching chip, as well as the connection module, respectively. The feedback pin is connected to the connection module.

[0010] Furthermore, the speed control module also includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a first diode; one end of the fifth resistor and one end of the sixth resistor are both connected to the control pin, the other end of the fifth resistor is connected to the power supply terminal, and the other end of the sixth resistor is connected to the second controlled electrode, the third electrode of the first switching chip, and the connection module, respectively; one end of the seventh resistor and one end of the eighth resistor are both connected to the feedback pin, the other end of the seventh resistor is grounded, the other end of the eighth resistor is connected to one end of the ninth resistor and the positive electrode of the first diode, and the other end of the ninth resistor and the negative electrode of the first diode are connected to the power supply terminal.

[0011] Furthermore, the connection module includes a connection terminal, a first pin of the connection terminal is grounded, a second pin of the connection terminal is connected to a first capacitor and a second capacitor respectively, a third pin of the connection terminal is connected to the feedback pin, and a fourth pin of the connection terminal is connected to the control pin.

[0012] Secondly, the present invention also provides a host computer, the host computer including a BIOS module and the noise reduction circuit described in any of the above claims.

[0013] Thirdly, the present invention also provides a noise reduction method for controlling the aforementioned host computer, the method comprising: Controlled by the boot command that starts the host, the status information of the host's BIOS module is obtained, wherein the status information includes a first status and a second status, the first status corresponding to incomplete initialization and the second status corresponding to completed initialization; If the status information of the BIOS module is the first status, then the fan module of the host is turned off; If the status information of the BIOS module is the second state, then control is transferred to the fan control module of the host.

[0014] The present invention discloses a host computer including a BIOS module, a noise reduction circuit, and a noise reduction method for controlling the host computer. The noise reduction circuit includes a main control module, a switch module, a connection module, and a fan control module. The main control module is connected to the switch module, the fan control module, and the BIOS module. The switch module and the fan control module are both connected to the connection module, which is connected to the fan module. When the BIOS module has not completed initialization, the main control module controls the switch module to switch states, interrupting the fan control module's control over the fan module, thereby shutting down the fan module. After the BIOS module completes initialization, the main control module controls the switch module to return to its original state, restoring the fan control module's control over the fan module, and the fan module operates normally. This reduces the noise of the host computer during startup and improves the user experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a block diagram of a noise reduction circuit provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of a noise reduction circuit provided in an embodiment of the present invention; Figure 3 This is a flowchart illustrating a noise reduction method provided in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0019] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0020] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for illustrating and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0021] See Figures 1 to 2 , Figure 1 This is a block diagram of a noise reduction circuit 100 provided in an embodiment of the present invention; Figure 2 This is a circuit diagram of a noise reduction circuit 100 provided in an embodiment of the present invention. Figures 1 to 2 As shown, the noise reduction circuit 100 includes a main control module 10, a switch module 20, a connection module 30, and a fan control module 40. The main control module 10 is connected to the BIOS module 200 of the host computer and is used to detect whether the BIOS module 200 has completed initialization. One end of the switch module 20 is connected to the main control module 10 and is used to turn the switch on and off according to the control signal of the main control module 10. One end of the connection module 30 is connected to the other end of the switch module 20. One end of the fan control module 40 is connected to the main control module 10, and the other end of the fan control module 40 is connected to both the switch module 20 and the connection module 30. If the main control module 10 detects that the BIOS module 200 has not completed initialization, it outputs a control signal to switch the state of the switch module 20 to interrupt the control of the fan control module 40 on the fan module 300 and turn off the fan module 300.

[0022] Specifically, the host computer may include a BIOS module 200 and a noise reduction circuit 100. The BIOS module 200 is connected to the noise reduction circuit 100. The noise reduction circuit 100 may include a main control module 10, a switch module 20, a connection module 30, and a fan control module 40. The main control module 10 is connected to the BIOS module 200 and is used to detect the initialization state of the BIOS module 200. This initialization state may include completed initialization and incomplete initialization. The main control module 10 can output different control signals according to the initialization state of the BIOS module 200. For example, the control signals may include a first control signal and a second control signal, wherein the first control signal is used to indicate that the BIOS module 200 has not completed initialization, and the second control signal is used to indicate that the BIOS module 200 has completed initialization.

[0023] The initialization of BIOS module 200 refers to the entire process by which the BIOS (Basic Input / Output System) gradually completes its own program loading, hardware detection and configuration, and functional preparation after being activated from standby mode. Ultimately, this gives the system the basic ability to manage hardware (such as fans, storage, and peripherals) and boot the operating system. After initialization, the BIOS reads the user configuration parameters stored in its own memory and writes these configurations into hardware registers, causing the hardware to operate according to preset rules. That is, before the BIOS initialization is complete, the hardware typically operates according to default logic; for example, fan module 300 will start by default and run at its highest speed.

[0024] The main control module 10 of this invention is connected to both the switch module 20 and the fan control module 40. The fan control module 40 controls the starting and stopping of the fan module 300 and adjusts its speed. In the default state, the fan control module 40 controls the fan module 300 to start. The switch module 20 is also connected to the main control module 10 and can be turned on and off according to control signals from the control module. For example, when the switch module 20 receives a first control signal, it turns on; when it receives a second control signal, it turns off. The switch module 20 is used to interrupt or resume the control of the fan module 300 by the fan control module 40.

[0025] The switch module 20 is connected to the fan control module 40, which in turn is connected to the connection module 30. When the switch module 20 is in its default state, the fan control module 40 can control the fan module 300 to start via the connection module 30. The fan control module 40 can start the fan module 300 normally and adjust its speed according to a preset program. For example, it can adjust the fan speed based on the hardware temperature; the higher the temperature, the faster the speed. When the switch module 20 switches from its default state to another state, the fan control module 40 interrupts its control of the fan module 300, and the fan module 300 cannot start.

[0026] In a further embodiment, the switch module 20 includes a first switch element Q1. The first controlled terminal of the first switch element Q1 is connected to the main control module 10, the second controlled terminal of the first switch element Q1 is connected to the fan control module 40, the first terminal of the first switch element Q1 is grounded, the second terminal of the first switch element Q1 is connected to a power supply terminal, the third terminal of the first switch element Q1 is connected to the fan control module 40, and the fourth terminal of the first switch element Q1 is grounded. Further, the switch module 20 also includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to the main control module 10, and the other end of the first resistor R1 is connected to the first controlled terminal of the first switch element Q1; one end of the second resistor R2 is connected to the power supply terminal, and the other end of the second resistor R2 is connected to both the second terminal and the second controlled terminal of the first switch element Q1. Further, the switch module 20 also includes a third resistor R3; one end of the third resistor R3 is connected to the second controlled terminal of the first switch element Q1, and the other end of the third resistor R3 is connected to the fan control module 40. Furthermore, the switching module 20 also includes a fourth resistor R4; one end of the fourth resistor R4 is connected to the third terminal of the first switching element Q1, and the other end of the fourth resistor R4 is connected to the fan control module 40.

[0027] Among them, such as Figure 1 As shown, the switch module 20 can control the fan control module 40 to turn on and off according to the level of GPO_CTL output by the main control module 10, so as to stop the fan before BIOS initialization and restore control after initialization. The switch module 20 may include a first switch element Q1, a first resistor R1, a second resistor R2 and a tenth resistor R10. At the same time, the switch module 20 may also include a third resistor R3 or a fourth resistor R4 to adapt to the differences of different default control signals and improve compatibility.

[0028] like Figure 2As shown, the switch module 20 may include a first switch element Q1. The first controlled terminal (pin 2) of the first switch element Q1 is connected to the first resistor R1 and is connected to the main control module 10 through the first resistor R1. The first terminal (pin 1) of the first switch element Q1 is grounded. The second terminal (pin 6) of the first switch element Q1 is connected to the power supply terminal VDD through the second resistor R2. The second controlled terminal (pin 5) of the first switch element Q1 is connected to the power supply terminal through the second resistor R2 on one hand, and on the other hand, it can be used to connect to the third resistor R3 and is connected to the fan control module 40 through the third resistor R3. The third terminal (pin 3) of the first switch element Q1 is used to connect to the fourth resistor R4 and is connected to the fan control module 40 through the fourth resistor R4. The fourth terminal (pin 4) of the first switch element Q1 is grounded.

[0029] Figure 2 The diagram also shows a third resistor R3 and a fourth resistor R4. It's understood that either R3 or R4 can be installed depending on the actual needs. For example, if R3 is installed, one end of R3 is connected to pin 5 of the first switching element Q1, and the other end is connected to the fan control module 40, while pin 3 of the first switching element Q1 is in the open state. If R4 is installed, one end of R4 is connected to pin 3 of the first switching element Q1, and the other end is connected to the fan control module 40, while pin 5 of the first switching element Q1 is in the open state.

[0030] The following are explanations of each scenario. In scenario one, if the GPO_CTL signal is high by default, the third resistor R3 can be installed, but the fourth resistor R4 is not installed. This will pull the fan control module 40 low, causing the fan to stop. After the BIOS module 200 completes its initialization, the BIOS module 200 will set the GPO_CTL signal to low. Then, the fan control module 40 will adjust the speed of the fan module 300 according to the real-time temperature of the main control module 10.

[0031] In scenario two, when the GPO_CTL signal is low by default, the third resistor R3 is not installed, but the fourth resistor R4 is installed. This will pull the fan control module 40 low, stopping the fan. After the BIOS module 200 is initialized, the BIOS module 200 will set the GPO_CTL signal high. Then, the fan control module 40 will adjust the fan speed of the fan module 300 according to the real-time CPU temperature.

[0032] In scenario three, when the GPO_CTL signal is in a high-impedance state by default, installing the third resistor R3 and not installing the fourth resistor R4 will pull the fan control module 40 low, stopping the fan. After the BIOS module 200 is initialized, the BIOS module 200 will set the GPO_CTL signal to a low level, and then the fan control module 40 will adjust the speed of the fan module 300 according to the real-time temperature of the CPU.

[0033] As a further embodiment, the speed control module includes a speed control chip U1, which includes a control pin and a feedback pin. The control pin is connected to the second controlled electrode and the third electrode of the first switching chip, as well as the connection module 30, respectively. The feedback pin is connected to the connection module 30. Further, the speed control module also includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a first diode D1. One end of the fifth resistor R5 and one end of the sixth resistor R6 are both connected to the control pin, and the other end of the fifth resistor R5 is connected to the power supply terminal. The other end of the sixth resistor R6 is connected to the second controlled electrode and the third electrode of the first switching chip, as well as the connection module 30, respectively. One end of the seventh resistor R7 and one end of the eighth resistor R8 are both connected to the feedback pin, and the other end of the seventh resistor R7 is grounded. The other end of the eighth resistor R8 is connected to one end of the ninth resistor R9 and the positive electrode of the first diode D1, respectively. The other end of the ninth resistor R9 and the negative electrode of the first diode D1 are connected to the power supply terminal.

[0034] The fan control module 40 may include a speed control chip U1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a first diode D1. The speed control chip U1 can communicate with the main control module 10 through the bus to obtain CPU temperature information. The FAN_CTL pin outputs a PWM control signal, and the FAN_TAC pin collects fan speed feedback.

[0035] One end of the fifth resistor R5 is connected to the FAN_CTL pin of the speed control chip U1, and the other end is connected to VDD, used to pull up the FAN_CTL signal. One end of the sixth resistor R6 is connected to the FAN_CTL pin of the speed control chip U1, and the other end is connected to the connection module 30. One end of the seventh resistor R7 is connected to the FAN_TAC pin of the speed control chip U1, and the other end is connected to GND, used to pull down the FAN_TAC signal. One end of the eighth resistor R8 is connected to the FAN_TAC pin of the speed control chip U1, and the other end is connected to one end of the ninth resistor R9 and the positive terminal of the first diode D1. The ninth resistor R9 is connected to the +12V power supply. The negative terminal of the first diode D1 is connected to +12V to prevent the fan's reverse electromotive force from damaging the chip.

[0036] Explained in three application scenarios Scenario 1: If GPO_CTL is high by default, the third resistor R3 can be installed, but the fourth resistor R4 is not. Initially, GPO_CTL is high → Q1 is cut off → FAN_CTL is pulled low → the fan stops; after BIOS initialization, GPO_CTL is set high → U1 takes over control.

[0037] Scenario 2: If GPO_CTL is low by default, the third resistor R3 can be omitted, and the fourth resistor R4 can be installed instead. Initially, GPO_CTL is low during startup → Q1 is cut off → FAN_CTL is pulled low → the fan stops; after BIOS initialization, GPO_CTL is set high → U1 takes over control.

[0038] Scenario 3: If GPO_CTL is in a high-impedance state by default, and the third resistor R3 is installed while the fourth resistor R4 is not installed, then at the beginning of power-on, GPO_CTL is high level → Q1 is cut off → FAN_CTL is pulled low → the fan stops; after BIOS initialization, GPO_CTL is set high → U1 takes over control.

[0039] As a further embodiment, the connection module 30 includes a connection terminal CN1, a first pin of the connection terminal CN1 is grounded, a second pin of the connection terminal CN1 is connected to a first capacitor C1 and a second capacitor C2 respectively, a third pin of the connection terminal CN1 is connected to the feedback pin, and a fourth pin of the connection terminal CN1 is connected to the control pin.

[0040] Among them, the connection terminal CN1 can be a fan connector. The first pin of the connection terminal CN1 is grounded, the second pin is connected to the first capacitor C1 and the second capacitor C2 respectively, the first capacitor C1 and the second capacitor C2 are grounded, the third pin is connected to the feedback pin, and the fourth pin is connected to the control pin. The speed control chip U1 can control the start and stop of the fan module 300 through the connection terminal CN1, and can also adjust the speed of the fan module 300 according to the temperature of the main control module 10.

[0041] The present invention also provides a host computer, the host computer including a BIOS module 200 and a noise reduction circuit 100 as described in any of the above embodiments; the noise reduction circuit 100 includes a main control module 10, a switch module 20, a connection module 30, and a fan control module 40; the main control module 10 is connected to the BIOS module 200 of the host computer and is used to detect whether the BIOS module 200 has completed initialization; one end of the switch module 20 is connected to the main control module 10 and is used to turn on and off according to the control signal of the main control module 10; one end of the connection module 30 is connected to the other end of the switch module 20; one end of the fan control module 40 is connected to the main control module 10, and the other end of the fan control module 40 is connected to the switch module 20 and the connection module 30 respectively; wherein, if the main control module 10 detects that the BIOS module 200 has not completed initialization, it outputs a control signal to switch the state of the switch module 20 to interrupt the control of the fan control module 40 on the fan module 300 to turn off the fan module 300.

[0042] Specifically, the host computer may include a BIOS module 200 and a noise reduction circuit 100. The BIOS module 200 is connected to the noise reduction circuit 100. The noise reduction circuit 100 may include a main control module 10, a switch module 20, a connection module 30, and a fan control module 40. The main control module 10 is connected to the BIOS module 200 and is used to detect the initialization state of the BIOS module 200. This initialization state may include completed initialization and incomplete initialization. The main control module 10 can output different control signals according to the initialization state of the BIOS module 200. For example, the control signals may include a first control signal and a second control signal, wherein the first control signal is used to indicate that the BIOS module 200 has not completed initialization, and the second control signal is used to indicate that the BIOS module 200 has completed initialization.

[0043] The initialization of BIOS module 200 refers to the entire process by which the BIOS (Basic Input / Output System) gradually completes its own program loading, hardware detection and configuration, and functional preparation after being activated from standby mode. Ultimately, this gives the system the basic ability to manage hardware (such as fans, storage, and peripherals) and boot the operating system. After initialization, the BIOS reads the user configuration parameters stored in its own memory and writes these configurations into hardware registers, causing the hardware to operate according to preset rules. That is, before the BIOS initialization is complete, the hardware typically operates according to default logic; for example, fan module 300 will start by default and run at its highest speed.

[0044] The main control module 10 of this invention is connected to both the switch module 20 and the fan control module 40. The fan control module 40 controls the starting and stopping of the fan module 300 and adjusts its speed. In the default state, the fan control module 40 controls the fan module 300 to start. The switch module 20 is also connected to the main control module 10 and can be turned on and off according to control signals from the control module. For example, when the switch module 20 receives a first control signal, it turns on; when it receives a second control signal, it turns off. The switch module 20 is used to interrupt or resume the control of the fan module 300 by the fan control module 40.

[0045] The switch module 20 is connected to the fan control module 40, which in turn is connected to the connection module 30. When the switch module 20 is in its default state, the fan control module 40 can control the fan module 300 to start via the connection module 30. The fan control module 40 can start the fan module 300 normally and adjust its speed according to a preset program. For example, it can adjust the fan speed based on the hardware temperature; the higher the temperature, the faster the speed. When the switch module 20 switches from its default state to another state, the fan control module 40 interrupts its control of the fan module 300, and the fan module 300 cannot start.

[0046] The noise reduction circuit disclosed in this invention can, when the BIOS module has not completed initialization, control the switch module to switch states, interrupt the fan control module's control of the fan module, and thus shut down the fan module. After the BIOS module has completed initialization, the main control module controls the switch module to return to its original state, restores the fan control module's control of the fan module, and the fan module operates normally. This can reduce the noise of the host during startup and improve the user experience.

[0047] See Figure 3 The present invention also provides a noise reduction method, which is applied to a host computer according to any one of the above embodiments, for turning off the fan module to reduce noise when the host computer starts up, such as... Figure 1 As shown, the noise reduction method includes steps S110-S130.

[0048] S110, controlled by the boot command of the host, obtain the status information of the host's BIOS module, wherein the status information includes a first state and a second state, the first state corresponding to incomplete initialization and the second state corresponding to completed initialization.

[0049] In this embodiment of the invention, when the user presses the power button on the host (or a remote wake-up command), the startup command triggers the host power-on process, and the main control module begins to interact with the BIOS module to detect its initialization status in real time. The first state (initialization incomplete) means that the BIOS is in the power-on self-test (POST) or hardware initialization stage, and the PGPO_CTL pin outputs a default level, indicating that the BIOS is not ready.

[0050] The second state (initialization complete) means that after the BIOS has completed all hardware configuration and policy loading, it sends a command to the main control module through the SPI bus to actively switch the level of the GPO_CTL pin (such as from low level to high level, or vice versa), indicating that the BIOS is ready and can take over hardware control.

[0051] S120, if the status information of the BIOS module is the first state, then the fan module of the host is turned off.

[0052] In this embodiment of the invention, when the BIOS is in the first state (GPO_CTL is at the default level), the switching module is in the off state, the gate (G) voltage of Q1 has not reached the conduction threshold, and the drain (D) and source (S) are in an open circuit state, directly cutting off the FAN_CTL signal path of the fan control module and the fan module. During the initial power-on period, the main control module temperature is at room temperature, and a short-term (2-3 seconds) shutdown will not cause the main control module to overheat, thus balancing noise reduction and heat dissipation safety.

[0053] S130, if the status information of the BIOS module is the second state, then the control authority is transferred to the fan control module of the host.

[0054] In this embodiment of the invention, when the BIOS enters the second state (GPO_CTL level switching), the transfer of control authority is divided into two steps: After the GPO_CTL level is switched, the gate (G) voltage of Q1 meets the conduction condition, the drain (D) and source (S) are connected, the FAN_CTL signal path is released, and the PWM signal of the fan control module can be transmitted to the fan normally.

[0055] The BIOS sends fan speed control strategies to the fan control module via the bus (e.g., 30% fan speed when CPU temperature is <40℃, 100% fan speed when CPU temperature is >70℃). The fan control module reads the main control module temperature in real time via the bus and adjusts the PWM duty cycle of FAN_CTL according to the preset strategy (the larger the duty cycle, the higher the fan speed), achieving a dynamic balance between temperature and fan speed.

[0056] The noise reduction method of the present invention can detect the status of the BIOS module when powered on. When the BIOS module completes initialization, the fan module is controlled normally. When the BIOS module has not completed initialization, the fan module is turned off to avoid generating excessive noise, thereby improving the user experience.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A noise reduction circuit, characterized by, The application is applied to a host, and the noise reduction circuit comprises: a host module connected with a BIOS module of the host, used for detecting whether the BIOS module is initialized; a switch module connected with the host module at one end, used for being turned on and turned off according to the control signal of the host module; a connection module connected with the other end of the switch module at one end; a fan control module connected with the host module at one end and connected with the switch module and the connection module at the other end; wherein, if the host module detects that the BIOS module is not initialized, the control signal is output to switch the state of the switch module to interrupt the control of the fan control module on the fan module to turn off the fan module.

2. The noise reduction circuit of claim 1, wherein, The switch module comprises a first switch element, the first controlled electrode of the first switch element is connected with the host module, the second controlled electrode of the first switch element is connected with the fan control module, the first electrode of the first switch element is grounded, the second electrode of the first switch element is connected with a power supply end, the third electrode of the first switch element is connected with the fan control module, and the fourth electrode of the first switch element is grounded.

3. The noise reduction circuit of claim 2, wherein, The switch module further comprises a first resistor and a second resistor; one end of the first resistor is connected with the host module, and the other end of the first resistor is connected with the first controlled electrode of the first switch element; one end of the second resistor is connected with the power supply end, and the other end of the second resistor is connected with the second electrode and the second controlled electrode of the first switch element.

4. The noise reduction circuit of claim 2, wherein, The switch module further comprises a third resistor; one end of the third resistor is connected with the second controlled electrode of the first switch element, and the other end of the third resistor is connected with the fan control module.

5. The noise reduction circuit of claim 2, wherein, The switch module further comprises a fourth resistor; one end of the fourth resistor is connected with the third electrode of the first switch element, and the other end of the fourth resistor is connected with the fan control module.

6. The noise reduction circuit of claim 2, wherein, The speed regulation module comprises a speed regulation chip, the speed regulation chip comprises a control pin and a feedback pin, the control pin is connected with the second controlled electrode, the third electrode of the first switch chip and the connection module respectively; the feedback pin is connected with the connection module.

7. The noise reduction circuit of claim 5, wherein, The speed regulation module further comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a first diode; one end of the fifth resistor and one end of the sixth resistor are connected with the control pin, the other end of the fifth resistor is connected with the power supply end, and the other end of the sixth resistor is connected with the second controlled electrode, the third electrode of the first switch chip and the connection module respectively; one end of the seventh resistor and one end of the eighth resistor are connected with the feedback pin, the other end of the seventh resistor is grounded, the other end of the eighth resistor is connected with one end of the ninth resistor and the anode of the first diode respectively, and the other end of the ninth resistor and the cathode of the first diode are connected with the power supply end.

8. The noise reduction circuit of claim 5, wherein, The connection module comprises a connection terminal, a first pin of the connection terminal is grounded, a second pin of the connection terminal is connected with a first capacitor and a second capacitor respectively, a third pin of the connection terminal is connected with the feedback pin, and a fourth pin of the connection terminal is connected with the control pin.

9. A host, characterized by The computer system comprises a BIOS module and a noise reduction circuit as claimed in any one of claims 1-8.

10. A method of noise reduction, characterized by, A method for controlling a host as claimed in claim 9, the method comprising: obtaining state information of a BIOS module of the host under control of a start instruction for starting the host, wherein the state information comprises a first state and a second state, the first state corresponding to incomplete initialization, and the second state corresponding to complete initialization; if the state information of the BIOS module is the first state, shutting down a fan module of the host; if the state information of the BIOS module is the second state, transferring control authority to a fan control module of the host.

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