Driving circuit, heat dissipation device and server

Abstract

The present application discloses a driving circuit, a heat dissipation device and a server, which relates to the field of server heat dissipation technology and helps to avoid power consumption waste. The driving circuit includes: a PWM generation circuit and a PWM voltage regulation circuit, wherein the output end of the PWM generation circuit is connected to the control end of the heat dissipation component, and is used to output a target PWM signal to the control end of the heat dissipation component; the output end of the PWM voltage regulation circuit is connected to both the output end of the PWM generation circuit and the control end of the heat dissipation component, and the PWM voltage regulation circuit is used to output a first voltage regulation signal when the temperature of the heat dissipation component is lower than a preset temperature, and the first voltage regulation signal is used to adjust the high-level voltage amplitude of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work. The driving circuit can be used to drive the heat dissipation component to dissipate heat from the heat dissipation component.

Description

Technical Field

[0001] This application relates to the field of server heat dissipation technology, and in particular to a drive circuit, heat dissipation device and server. Background Art

[0002] During server operation, the electronic components generate heat. If this heat is not cooled in time, the components may overheat and become damaged. Therefore, servers are typically equipped with heat dissipation components to cool these components.

[0003] In related technologies, a baseboard management controller (BMC) typically generates a pulse width modulation (PWM) signal to control the switching of heat sink components. However, with this implementation, if the BMC is not fully activated or malfunctions, it cannot control the switching of the heat sink components. In this case, if the electronic components are at a low temperature but the heat sink components are still running, significant power consumption will be wasted because the rotational speed of the heat sink components cannot be changed. Summary of the Invention

[0004] This application provides a driving circuit, a heat dissipation device, and a server, which can adjust the voltage amplitude of the high level of the PWM signal according to the temperature of the component to be cooled, thereby controlling the switching of the heat dissipation component and helping to avoid power waste.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, a driving circuit is provided. The driving circuit is used to drive a heat dissipation component to dissipate heat from the component to be dissipated. The driving circuit includes a PWM generation circuit, the output terminal of which is connected to the control terminal of the heat dissipation component. The PWM generation circuit is used to output a target PWM signal to the control terminal of the heat dissipation component. The PWM voltage regulation circuit is also provided. The output terminal of the PWM voltage regulation circuit is connected to both the output terminal of the PWM generation circuit and the control terminal of the heat dissipation component. The PWM voltage regulation circuit is used to output a first voltage regulation signal when the temperature of the component to be dissipated is lower than a preset temperature. The first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work.

[0007] In this scheme, when the temperature of the component to be cooled is lower than a preset temperature, the first voltage regulation signal output by the PWM voltage regulation circuit adjusts the high-level voltage amplitude of the target PWM signal to a value lower than the voltage amplitude required to drive the cooling component. Thus, when the cooling component receives the adjusted target PWM signal, since the high-level voltage amplitude of the adjusted target PWM signal does not reach the voltage amplitude required to drive the cooling component, the cooling component will stop working regardless of the duty cycle of the adjusted target PWM signal. This achieves the adjustment of the high-level voltage amplitude of the target PWM signal according to the temperature of the component to be cooled, thereby controlling the switching of the cooling component. This avoids the target PWM signal driving the cooling component when the temperature of the component to be cooled has not reached the required cooling temperature, helping to avoid wasted power. For example, in related technologies, when the BMC is not fully started or malfunctions, and it is necessary to control the heat dissipation component to shut down, the BMC cannot obtain the temperature of the component to be dissipated, thus making it impossible to control the heat dissipation component to shut down by changing the duty cycle of the PWM signal. Based on the solution of this application, the heat dissipation component can be controlled to shut down by changing the voltage amplitude of the high level of the PWM signal, thereby avoiding power waste.

[0008] In one possible implementation, the voltage amplitude of the first voltage regulation signal is less than the voltage amplitude required to drive the heat dissipation component to work; specifically, the first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to the voltage amplitude of the first voltage regulation signal.

[0009] In this implementation, by setting the voltage amplitude of the first voltage regulating signal to be less than the voltage amplitude required to drive the heat dissipation component, and specifically using the first voltage regulating signal to adjust the voltage amplitude of the high level of the target PWM signal to the voltage amplitude of the first voltage regulating signal, the voltage amplitude of the high level of the target PWM signal can be kept constant at the voltage amplitude of the first voltage regulating signal. In this way, by adjusting the voltage amplitude of the first voltage regulating signal, the voltage amplitude of the high level of the target PWM signal can be adjusted accordingly, which helps to more accurately ensure the relationship between the voltage amplitude of the high level of the target PWM signal and the voltage amplitude required to drive the heat dissipation component, thereby ensuring the accuracy of the switching control of the heat dissipation component.

[0010] In another possible implementation, a PWM drive power supply is used to output a power supply signal; a thermistor circuit is connected to the PWM drive power supply at its input and to the PWM voltage regulation circuit at its output. The thermistor circuit receives the power supply signal and adjusts it into a first voltage regulation signal before outputting it. The voltage amplitude of the first voltage regulation signal changes with the resistance of the thermistor circuit, and the resistance of the thermistor circuit changes with the temperature of the component to be cooled.

[0011] In this implementation, the PWM voltage regulation circuit includes a PWM drive power supply and a thermistor circuit. Since the resistance of the thermistor circuit can automatically change with the temperature of the component to be cooled, the PWM voltage regulation circuit can automatically sense the temperature of the component to be cooled and automatically adjust the voltage amplitude of the voltage regulation signal according to the temperature of the component to be cooled. The whole process does not require a control device to adjust the voltage amplitude of the voltage regulation signal output by the PWM voltage regulation circuit, which is not only low in cost but also simple to implement.

[0012] In another possible implementation, the thermistor circuit includes: a thermistor whose resistance changes with the temperature of the component to be cooled; and a voltage divider resistor connected in series with the thermistor, wherein the voltage divider resistor is a resistor with a constant resistance; wherein the output terminal of the thermistor circuit is located between the thermistor and the voltage divider resistor.

[0013] In this implementation, a thermistor senses the temperature of the component to be cooled, and its resistance changes with the temperature of the component, thus enabling the thermistor circuit's resistance to automatically adjust to the temperature of the component. Furthermore, by setting a voltage divider resistor, a portion of the voltage in the power supply signal output by the PWM drive power supply drops across the voltage divider resistor, thereby reducing the voltage drop across the thermistor in the power supply signal output by the PWM drive power supply.

[0014] In another possible implementation, when the thermistor is a positive temperature coefficient thermistor, the thermistor is located between the output terminal and the ground terminal of the thermistor circuit.

[0015] This implementation provides a specific method for implementing a thermistor circuit, which can sense the temperature of the component to be cooled by a positive temperature coefficient thermistor, thereby automatically adjusting the resistance value of the thermistor circuit.

[0016] In another possible implementation, when the thermistor is a negative temperature coefficient thermistor, the thermistor is located between the PWM drive power supply and the output terminal of the thermistor circuit.

[0017] This implementation provides a specific method for implementing a thermistor circuit, which can sense the temperature of the component to be cooled by a negative temperature coefficient thermistor, thereby automatically adjusting the resistance value of the thermistor circuit.

[0018] In another possible implementation, the PWM generation circuit includes: a PWM controller for generating a first PWM signal; and a PWM isolation circuit connected to the PWM controller, which receives the first PWM signal, adjusts the first PWM signal to a target PWM signal, and outputs it to the control terminal of the heat dissipation component; the target PWM signal has the same frequency, period, and duty cycle as the first PWM signal.

[0019] In this implementation, by setting the PWM generation circuit to include a PWM controller for generating the first PWM signal and a PWM isolation circuit, on the one hand, it can ensure that the PWM generation circuit can generate the first PWM signal; on the other hand, the PWM isolation circuit can isolate the PWM controller and the heat dissipation component, so that the failure of the heat dissipation component can be isolated on the output side of the PWM isolation circuit, and avoid the failure of the heat dissipation component from affecting the PWM controller.

[0020] In another possible implementation, the PWM controller is an out-of-band controller or a programmable logic device (PLD).

[0021] In this implementation, since servers are typically equipped with out-of-band controllers or programmable logic devices (PLDs), by setting the PWM controller to an out-of-band controller or a PLD, PWM signals can be generated using the server's own components. This eliminates the need to add new components for generating PWM signals, avoids modifications to the motherboard's circuit layout, and helps reduce costs.

[0022] In another possible implementation, the PWM voltage regulation circuit is also used to output a second voltage regulation signal when the temperature of the component to be cooled is greater than or equal to a preset temperature. The second voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component.

[0023] In this implementation, when the temperature of the component to be cooled is greater than or equal to a preset temperature, the second voltage regulation signal adjusts the voltage amplitude of the high-level level of the target PWM signal to a value greater than or equal to the voltage amplitude required to drive the cooling component. Thus, when the cooling component receives the adjusted target PWM signal, since the voltage amplitude of the high-level level of the adjusted target PWM signal reaches the voltage amplitude required to drive the cooling component, the cooling component can operate according to the rotational speed corresponding to the duty cycle of the adjusted target PWM signal. This helps ensure that the cooling component can cool the component promptly when cooling is needed.

[0024] In a second aspect, a heat dissipation control method is provided for any of the driving circuits provided in the first aspect. The method includes: generating a target PWM signal and a first voltage regulation signal when the temperature of the component to be cooled is lower than a preset temperature; wherein the first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work; adjusting the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work; and outputting the adjusted target PWM signal to the heat dissipation component.

[0025] In this embodiment, when the temperature of the component to be cooled is lower than a preset temperature, the first voltage regulation signal generated by the driving circuit adjusts the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the cooling component. Thus, when the cooling component receives the adjusted target PWM signal, since the voltage amplitude of the high level of the adjusted target PWM signal does not reach the voltage amplitude required to drive the cooling component, the cooling component will stop working regardless of the PWM signal's duty cycle. This avoids the target PWM signal driving the cooling component to work when the temperature of the component to be cooled has not reached the required cooling temperature, thus helping to avoid wasted power.

[0026] Thirdly, a heat dissipation device is provided, comprising: a heat dissipation component and any of the driving circuits provided in the first aspect. The driving circuit is used to drive the heat dissipation component to operate.

[0027] Fourthly, a server is provided, comprising: a component to be cooled, a heat dissipation component, and any of the driving circuits provided in the first aspect. The heat dissipation component is used to dissipate heat from the component to be cooled, and the driving circuit is used to drive the heat dissipation component to operate.

[0028] Fifthly, a chip is provided, comprising: any one of the driving circuits provided in the first aspect above.

[0029] Sixthly, a server is provided, comprising: any one of the chips provided in the fifth aspect above.

[0030] In a seventh aspect, a server is provided, comprising: any of the driving circuits provided in the first aspect above.

[0031] The technical effects of any of the implementation methods in aspects three through seven can be found in the technical effects of different implementation methods in aspect one, and will not be repeated here. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a driving circuit provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of another PWM generation circuit provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of another PWM voltage regulation circuit provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of another PWM voltage regulation circuit provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of another PWM voltage regulation circuit provided in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of another PWM voltage regulation circuit provided in an embodiment of this application;

[0038] Figure 7 A flowchart illustrating a heat dissipation control method provided in an embodiment of this application;

[0039] Figure 8 A flowchart of another heat dissipation control method provided in an embodiment of this application. Detailed Implementation

[0040] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0041] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0042] In this application, the term "at least one" means one or more, and the term "multiple" means two or more. For example, multiple second messages refer to two or more second messages.

[0043] It should be understood that the terminology used in the description of the various examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various examples and the appended claims, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0044] It should also be understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" describes an association between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects are in an "or" relationship.

[0045] It should also be understood that, in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0046] It should be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0047] It should also be understood that the term “comprising” (also referred to as “includes”, “including”, “comprises” and / or “comprising”) as used in this specification specifies the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0048] It should also be understood that the term "if" can be interpreted as meaning "when" or "upon" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrases "if determination..." or "if detection [the stated condition or event]" can be interpreted as meaning "when determination..." or "in response to determination..." or "when detection [the stated condition or event]" or "in response to detection [the stated condition or event]."

[0049] It should be understood that the phrases "an embodiment," "an embodiment," and "a possible implementation" used throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment or implementation is included in at least one embodiment of this application. Therefore, the phrases "in an embodiment," "an embodiment," or "a possible implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0050] The following provides an exemplary description of the application scenarios of the embodiments of this application.

[0051] The driving circuit provided in this application is applied to a communication device to drive the heat dissipation components on the communication device, thereby dissipating heat from the components to be cooled. The communication device can be a server, switch, or repeater, etc. This application does not impose any limitations on the specific form of the communication device.

[0052] The following description, in conjunction with the accompanying drawings and taking the application of the driving circuit in a server as an example, illustrates the driving circuit provided in the embodiments of this application:

[0053] like Figure 1 As shown in the embodiment of this application, the driving circuit 10 is used to drive the heat dissipation component 20 on the server. The output terminal of the driving circuit 10 is connected to the control terminal of the heat dissipation component 20 to output the target PWM signal generated by the driving circuit 10 to the heat dissipation component 20, thereby driving the heat dissipation component 20 to work and dissipate heat for the component 30 to be dissipated.

[0054] Optionally, the heat dissipation component 20 can be a fan. The voltage amplitude required to drive the heat dissipation component is set at the factory, for example, it can be 3.3V, 5V, etc. It should be noted that the specific value of the voltage amplitude is not limited in this embodiment. In the following embodiments, a voltage amplitude of 3.3V is used as an example to illustrate the operation of the heat dissipation component. In some embodiments, the voltage amplitude required for operation can also be referred to as the rated voltage value.

[0055] Therefore, if the high-level voltage amplitude of the target PWM signal is less than 3.3V, the target PWM signal cannot drive the heat sink 20 to work, and the heat sink 20 will stop working. If the high-level voltage amplitude of the target PWM signal is greater than or equal to 3.3V, the target PWM signal can drive the heat sink 20 to work.

[0056] The component to be cooled 30 can be the central processing unit (CPU), memory, motherboard power supply circuit, motherboard chipset, etc. on the server.

[0057] It should be noted that the heat dissipation component 30 can be any component on the server that needs to be cooled, and the specific form of the heat dissipation component 30 is not limited in this application embodiment.

[0058] In some embodiments, the driving circuit 10 corresponds one-to-one with the heat dissipation component 20, that is, one driving circuit 10 is used to drive one heat dissipation component 20 to work.

[0059] In other embodiments, one drive circuit 10 corresponds to multiple heat dissipation components 20, that is, the one drive circuit 10 is used to drive multiple heat dissipation components 20 to work.

[0060] In some embodiments, a heat dissipation component 20 dissipates heat for a heat dissipation component 30 on a server, and the temperature of the heat dissipation component 30 mentioned below refers to the temperature of that heat dissipation component 30.

[0061] In other embodiments, a heat dissipation component 20 can dissipate heat for multiple components to be cooled on the server. The temperature of the component to be cooled, as mentioned below, can be the temperature of any one of the multiple components to be cooled, or it can be the temperature of the component with the highest temperature among the multiple components to be cooled, or it can be the temperature of a target component to be cooled among the multiple components to be cooled, wherein the target component to be cooled can be a component determined in advance from the multiple components to be cooled.

[0062] like Figure 1 As shown, the drive circuit 10 includes a PWM generation circuit 11 and a PWM voltage regulation circuit 12.

[0063] The output terminal of the PWM generation circuit 11 is connected to the control terminal of the heat sink 20. The PWM generation circuit 11 is used to output the target PWM signal to the control terminal of the heat sink 20.

[0064] For example, the PWM generation circuit 11 outputs a target PWM signal to the heat dissipation component 20, and the high-level voltage amplitude of the target PWM signal is 3.3V.

[0065] It should be noted that the embodiments of this application do not limit the duty cycle of the target PWM signal generated by the PWM generation circuit 11. For example, when the PWM generation circuit 11 is not fully started, the duty cycle of the target PWM signal can be a preset value. When the PWM generation circuit 11 malfunctions, the duty cycle of the target PWM signal can be determined by the PWM generation circuit 11 based on the temperature of the heat-dissipating component 30 obtained last time.

[0066] The output terminal of the PWM voltage regulation circuit 12 is connected to the output terminal of the PWM generation circuit 11 and the output terminal of the heat dissipation component 20.

[0067] The PWM voltage regulation circuit 12 is used to output a first voltage regulation signal when the temperature of the component to be cooled 30 is lower than the preset temperature. The first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component 20 to work.

[0068] For example, when the temperature of the component to be cooled 30 is lower than the preset temperature, the PWM voltage regulation circuit 12 outputs a first voltage regulation signal with a voltage amplitude of 1.5V. This first voltage regulation signal adjusts the voltage amplitude of the high level of the target PWM signal to less than 3.3V.

[0069] It should be noted that the specific value of the voltage amplitude of the first voltage regulating signal is not limited in the embodiments of this application, as long as the first voltage regulating signal can adjust the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component 20 to work.

[0070] Optionally, the first voltage regulation signal adjusts the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude of the first voltage regulation signal.

[0071] For example, the voltage amplitude of the first voltage regulation signal is 1.8V, and this 1.8V first voltage regulation signal adjusts the voltage amplitude of the high level of the target PWM signal from 3.3V to 1.5V.

[0072] Optionally, the voltage amplitude of the first voltage regulation signal is less than the voltage amplitude required to drive the heat dissipation component 20 to work. Specifically, the first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be equal to the voltage amplitude of the first voltage regulation signal.

[0073] For example, the voltage amplitude of the first voltage regulation signal is 1.5V, which can adjust the voltage amplitude of the high level of the target PWM signal from 3.3V to 1.5V.

[0074] By setting the voltage amplitude of the first voltage regulating signal to be less than the voltage amplitude required for the heat dissipation component 20 to operate, and specifically adjusting the voltage amplitude of the high level of the target PWM signal to the voltage amplitude of the first voltage regulating signal, the voltage amplitude of the high level of the target PWM signal can be kept constant at the voltage amplitude of the first voltage regulating signal. In this way, by adjusting the voltage amplitude of the first voltage regulating signal, the voltage amplitude of the high level of the target PWM signal can be adjusted accordingly. This helps to more accurately ensure the relationship between the voltage amplitude of the high level of the target PWM signal and the voltage amplitude required for the heat dissipation component 20 to operate, thereby ensuring the accuracy of the switching control of the heat dissipation component 20.

[0075] Optionally, the preset temperature can be determined based on the temperature threshold at which the component 20 to be cooled needs to be cooled. For example, the component 30 to be cooled can be cooled when its temperature reaches 40 degrees Celsius, but must be cooled when it reaches 60 degrees Celsius. Therefore, the preset temperature can be any temperature between 40 and 60 degrees Celsius, such as 40, 50, or 60 degrees Celsius.

[0076] The working principle of the drive circuit 10 will be explained below.

[0077] It should be noted that the following working principle does not limit the specific form of the PWM generation circuit 11 and the PWM voltage regulation circuit 12. The specific implementation of the PWM generation circuit 11 and the PWM voltage regulation circuit 12 will be described in subsequent embodiments.

[0078] The voltage amplitude of the voltage regulation signal output by the aforementioned PWM voltage regulation circuit 12 changes with the temperature of the component to be cooled 30. That is, the PWM voltage regulation circuit 12 can output a voltage regulation signal with a variable voltage amplitude; for example, the voltage amplitude of the voltage regulation signal increases as the temperature of the component to be cooled 30 increases. Based on this, when the temperature of the component to be cooled 30 is lower than a preset temperature, the PWM voltage regulation circuit 12 can output a first voltage regulation signal. When the temperature of the component to be cooled 30 is greater than or equal to the preset temperature, the PWM voltage regulation circuit 12 can output a second voltage regulation signal. The first voltage regulation signal is used to adjust the high-level voltage amplitude of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component 20, and the second voltage regulation signal is used to adjust the high-level voltage amplitude of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component 20.

[0079] It should be noted that when the first voltage regulation signal or the first voltage regulation signal regulates the target PWM signal, it will not change the frequency, period, or duty cycle of the target PWM signal. That is, the frequency, period, and duty cycle of the adjusted target PWM signal are the same as those of the target PWM signal before adjustment.

[0080] For ease of distinction, the target PWM signal before adjustment will be named target PWM signal 1, and the target PWM signal after adjustment will be named target PWM signal 2 and target PWM signal 3.

[0081] Based on this, when the temperature of the component to be cooled 30 is lower than the preset temperature, the PWM voltage regulation circuit 12 outputs a first voltage regulation signal. The first voltage regulation signal adjusts the voltage amplitude of the high level of the target PWM signal 1 to less than 3.3V, thus obtaining the target PWM signal 2. Since the voltage amplitude of the high level of the target PWM signal 2 is less than 3.3V, which does not reach the 3.3V required to drive the heat dissipation component 20, the heat dissipation component 20 cannot determine the high level of the target PWM signal 2 as a logic state "1". This causes the heat dissipation component 20 to confirm the duty cycle of the target PWM signal 2 as 0, and therefore, the heat dissipation component 20 stops working.

[0082] When the temperature of the component to be cooled 30 is greater than or equal to a preset temperature, the PWM voltage regulation circuit 12 outputs a second voltage regulation signal. The second voltage regulation signal adjusts the voltage amplitude of the high level of the target PWM signal 1 to be greater than or equal to 3.3V, thus obtaining the target PWM signal 3. Since the voltage amplitude of the high level of the target PWM signal 3 is greater than or equal to 3.3V, which is the 3.3V required to drive the heat dissipation component 20, the heat dissipation component 20 can determine the high level of the target PWM signal 3 as logic state "1". This allows the heat dissipation component 20 to accurately identify the duty cycle of the target PWM signal 3. Based on this, the heat dissipation component 20 can operate according to the rotational speed corresponding to the identified duty cycle.

[0083] It should be noted that the number of PWM voltage regulation circuits 12 in the driving circuit 10 is not limited in this embodiment. For example, the driving circuit 10 may include one PWM voltage regulation circuit 12, which is the PWM voltage regulation circuit 12 in the above embodiment. Of course, the driving circuit 10 may also include multiple PWM voltage regulation circuits 12. In this case, the last level of the multiple PWM voltage regulation circuits 12, or the PWM voltage regulation circuit 12 directly connected to the control terminal of the heat dissipation component 20, is the PWM voltage regulation circuit 12 in the above embodiment.

[0084] The following describes the application process of the drive circuit 10 on a server, based on the above working principle.

[0085] Example 1: The PWM generation circuit 11 (specifically, the PWM controller 110 in the following embodiment) is not fully activated. Therefore, it cannot obtain the temperature of the component 30 to be cooled from the temperature sensor. In this case, the PWM generation circuit 11 will generate a target PWM signal 1 with a preset duty cycle. If the heat dissipation component 20 receives the target PWM signal 1, it will operate according to the rotational speed corresponding to the preset duty cycle.

[0086] Based on this, if the temperature of the component to be cooled 30 is lower than the preset temperature, that is, the component to be cooled 30 does not need to be cooled, the PWM voltage regulation circuit 12 outputs a first voltage regulation signal, which adjusts the target PWM signal 1 to the target PWM signal 2. After receiving the target PWM signal 2, the heat dissipation component 20 cannot determine the high level of the target PWM signal 2 as a logic state "1", so it determines the duty cycle of the target PWM signal 2 as 0 and stops working.

[0087] In this way, when the heat dissipation component 30 does not need to be cooled, if the PWM generation circuit 11 cannot obtain the temperature of the heat dissipation component 30 and generate a target PWM signal 1 with a suitable duty cycle based on the temperature of the heat dissipation component 30, the drive circuit 10 can adjust the target PWM signal 1 that was originally to be output to the heat dissipation component 20 to the target PWM signal 2, so that the heat dissipation component 20 recognizes the duty cycle of the target PWM signal 2 as 0, thereby controlling the heat dissipation component 20 to turn off, avoiding the waste of power caused by the heat dissipation component 20 cooling the heat dissipation component 30 that does not need to be cooled.

[0088] If the actual temperature of the component 30 to be cooled is greater than or equal to the preset temperature, that is, the component 30 needs to be cooled, the PWM voltage regulation circuit outputs a second voltage regulation signal, which adjusts the target PWM signal 1 to the target PWM signal 3. After receiving the target PWM signal 3, the heat dissipation component 20 can accurately identify the duty cycle of the target PWM signal 3 because it can determine the high level of the target PWM signal 2 as a logic state "1". The heat dissipation component 20 can then operate according to the rotational speed corresponding to the identified duty cycle.

[0089] In this way, when the heat dissipation component 30 needs to be cooled, the drive circuit 10 can adjust the target PWM signal 1 that the drive circuit 10 originally output to the heat dissipation component 20 to the target PWM signal 3, so that the heat dissipation component 20 can identify the duty cycle of the target PWM signal 3, thereby controlling the heat dissipation component 20 to work and preventing the heat dissipation component 20 from being unable to cool the heat dissipation component 30 that needs to be cooled.

[0090] Example 2: The PWM generation circuit 11 (specifically the PWM controller 110 in the following embodiment) is fully started and can work normally. Therefore, the temperature of the component to be cooled 30 can be obtained from the temperature sensor, and a target PWM signal 1 with a suitable duty cycle can be generated according to the temperature of the component to be cooled 30.

[0091] It should be noted that the working principle of the drive circuit 10 in Example 2 is the same as that of the drive circuit 10 in Example 1, and will not be described in detail here.

[0092] Example 3: The PWM generation circuit 11 (specifically the PWM controller 110 in the following embodiment) malfunctions and therefore cannot obtain the temperature of the component to be cooled from the temperature sensor. At this time, the PWM controller will generate a target PWM signal 1 with a duty cycle of 1 based on the temperature 1. The temperature 1 is the temperature of the component to be cooled 30 that the PWM generation circuit 11 last obtained from the temperature sensor.

[0093] It should be noted that the working principle of the drive circuit 10 in Example 3 is the same as that of the drive circuit 10 in Example 1, and will not be described in detail here.

[0094] In the above embodiment, when the temperature of the component to be cooled 30 is lower than the preset temperature, the first voltage regulation signal output by the PWM voltage regulation circuit 12 adjusts the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component 20. Thus, after the heat dissipation component 20 receives the adjusted target PWM signal, since the voltage amplitude of the high level of the adjusted target PWM signal does not reach the voltage amplitude required to drive the heat dissipation component 20, the heat dissipation component 20 will stop working regardless of the duty cycle of the adjusted target PWM signal. This achieves the adjustment of the high level voltage amplitude of the target PWM signal according to the temperature of the component to be cooled 30, thereby controlling the switching of the heat dissipation component 20. This avoids the target PWM signal driving the heat dissipation component 20 to work when the temperature of the component to be cooled 30 has not reached the required cooling temperature, helping to avoid wasted power consumption.

[0095] Optionally, such as Figure 2 As shown, the PWM generation circuit 11 includes a PWM controller 110 and a PWM drive isolation circuit 111.

[0096] PWM controller 110, the PWM controller is used to generate the first PWM signal.

[0097] The PWM isolation circuit 111 is used to receive the first PWM signal, adjust the first PWM signal to the target PWM signal, and then output it to the control terminal of the heat dissipation component 20.

[0098] In some embodiments, the operating voltage of the PWM controller 110 is the same as the operating voltage of the heat sink component. For example, if the operating voltage of the PWM controller 110 is 3.3V and the operating voltage of the heat sink component is also 3.3V, then the frequency, duty cycle, and signal voltage of the target PWM signal output by the PWM isolation circuit 111 are the same as the first PWM signal. That is, when the operating voltage of the PWM controller 110 is the same as the operating voltage of the heat sink component, the PWM isolation circuit 111 does not need to adjust the signal voltage of the first PWM signal.

[0099] In other embodiments, the operating voltage of the PWM controller 110 differs from that of the heat sink component. For example, if the operating voltage of the PWM controller 110 is 1.2V and the operating voltage of the heat sink component is 3.3V, then the frequency and duty cycle of the target PWM signal output by the PWM isolation circuit 111 are the same as those of the first PWM signal, while the signal voltage of the first PWM signal is 1.2V and the signal voltage of the target PWM signal is 3.3V. That is, when the operating voltage of the PWM controller 110 differs from that of the heat sink component, the PWM isolation circuit 111 needs to adjust the signal voltage of the first PWM signal so that the signal voltage of the final output target PWM signal can be the same as the operating voltage of the heat sink component.

[0100] In the above embodiments, by setting the PWM generation circuit to include a PWM controller for generating the first PWM signal and a PWM isolation circuit, on the one hand, it can ensure that the PWM generation circuit can generate a PWM signal; on the other hand, the PWM isolation circuit can isolate the PWM controller and the heat sink, so that a failure of the heat sink can be isolated on the output side of the PWM isolation circuit, preventing the failure of the heat sink from affecting the PWM controller. Furthermore, when the operating voltage of the PWM controller is different from the operating voltage of the heat sink, the signal voltage of the first PWM signal generated by the PWM controller can be adjusted so that the signal voltage of the final output target PWM signal is the same as the operating voltage of the heat sink.

[0101] Optionally, the PWM controller 110 is an out-of-band controller or a programmable logic device (PLD) on the server.

[0102] The out-of-band controller remotely maintains and manages the computer equipment through a dedicated data channel. This out-of-band controller is completely independent of the computer equipment's operating system and can communicate with the basic input output system (processor firmware) and the OS (or OS management unit) through the computer equipment's out-of-band management interface.

[0103] For example, an out-of-band controller may include a monitoring and management unit external to the computer device, a management system in a management chip outside the processor, a BMC, a system management mode (SMM), etc. It should be noted that the embodiments of this application do not limit the specific form of the out-of-band controller; the above are merely illustrative examples.

[0104] Among them, the programmable logic device can be a complex programmable logic device (CPLD) or a field programmable gate array (FPGA).

[0105] In the above embodiments, since servers are typically equipped with out-of-band controllers or programmable logic devices (PLDs), by setting the PWM controller to an out-of-band controller or a PLD, the target PWM signal can be generated using the server's own components without adding new components for generating the target PWM signal, thus avoiding modifications to the motherboard's circuit layout and helping to reduce costs.

[0106] Optionally, the PWM drive isolation circuit 111 can be a field-effect transistor, a transistor, or an isolation optocoupler, etc.

[0107] For PWM voltage regulation circuits, there are multiple implementation methods, and the following examples illustrate methods 1 to 2.

[0108] Method 1: The PWM voltage regulation circuit 12 includes a PWM drive power supply 121 and a thermistor circuit 122. The PWM drive power supply 121 is used to output a power supply signal. The input terminal of the thermistor circuit 122 is connected to the output terminal of the PWM drive power supply 121, and the output terminal of the thermistor circuit 122 is the output terminal of the PWM voltage regulation circuit 12. The thermistor circuit 122 is used to receive the power supply signal, adjust the power supply signal to the first regulated signal, and then output it.

[0109] Optionally, such as Figure 3 and Figure 4 As shown, the thermistor circuit 122 includes a voltage divider resistor 1210 and a thermistor 1211, with the voltage divider resistor 1210 and the thermistor 1211 connected in series.

[0110] Among them, the voltage divider resistor 1210 is a resistor with a constant resistance, the resistance of the thermistor 1211 changes with the temperature of the component 30 to be cooled, and the output terminal of the thermistor circuit 122 is located between the thermistor and the voltage divider resistor.

[0111] For example, the thermistor 1211 can be placed in the vicinity of the component 30 to be cooled, so that the thermistor 1211 can sense the temperature of the component 30 and change accordingly with the temperature of the component 30. In this method, the principle of selecting the thermistor 1211 is as follows: a thermistor 1211 with a suitable temperature coefficient is selected based on a preset temperature, so that when the temperature of the thermistor 1211 has not reached the preset temperature, the resistance value of the thermistor can make the voltage amplitude of the first voltage regulation signal output by the thermistor circuit 122 less than the voltage amplitude required to drive the heat dissipation component 20 to work, and when the temperature of the thermistor 1211 reaches the preset temperature, the resistance value of the thermistor 1211 can make the voltage amplitude of the second voltage regulation signal output by the thermistor circuit 122 greater than or equal to the voltage amplitude required to drive the heat dissipation component 20 to work.

[0112] The PWM voltage regulation circuit 12 in Method 1 will be described below by way of an example.

[0113] like Figure 3 The diagram shown is a schematic of a driving circuit provided in an embodiment of this application. The thermistor circuit 122 in the driving circuit 10 includes a positive temperature coefficient thermistor 1211 and a voltage divider resistor 1210. The thermistor 1211 is located between the output terminal and the ground terminal of the thermistor circuit 122.

[0114] Since thermistor 1211 is located between the output terminal of thermistor circuit 122 and the ground terminal, the voltage amplitude at the output terminal of thermistor circuit 122 is equal to the voltage amplitude across the thermistor 1211. The resistance of thermistor 1211 increases as the temperature of the component 30 to be cooled rises; therefore, the voltage amplitude at the output terminal of thermistor circuit 122 also increases as the temperature of the component 30 to be cooled rises.

[0115] For example, when the temperature of the heat dissipation component 30 reaches 40 degrees, the resistance of the thermistor 1211 is the target resistance value. At this time, the voltage amplitude at the output terminal of the thermistor circuit 122 is greater than or equal to the voltage amplitude required to drive the heat dissipation component to work. For example, the voltage amplitude at the output terminal of the thermistor circuit 122 is the target voltage value.

[0116] Therefore, when the temperature of the component 30 to be cooled is low, such as below 40 degrees Celsius, the resistance of the thermistor 1211 is small (less than the target resistance), and the voltage at the output of the thermistor circuit 122 is also small (less than the target voltage). At this time, the voltage amplitude of the first voltage regulation signal output by the thermistor circuit 122 cannot reach the target value. This first voltage regulation signal can adjust the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component 20 to work. As the temperature of the component 30 to be cooled increases, the resistance of the thermistor continuously increases. At this time, the voltage amplitude at the output of the thermistor circuit also continuously increases, and correspondingly, the voltage amplitude of the second voltage regulation signal output by the thermistor circuit also continuously increases. When the temperature of the heat dissipation component 30 rises to the preset temperature, such as 40 degrees Celsius, the resistance of the thermistor reaches the target resistance value. At this time, the voltage value at the output terminal of the thermistor circuit reaches the target voltage value. Correspondingly, the voltage amplitude of the second voltage regulation signal output by the thermistor circuit also reaches the target voltage value. This second voltage regulation signal can adjust the amplitude of the high level of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component 20 to work.

[0117] The PWM voltage regulation circuit of Method 1 will be described below by way of another embodiment.

[0118] like Figure 4 The diagram shown is a schematic of a driving circuit provided in an embodiment of this application. The thermistor circuit 122 in the driving circuit 10 includes a negative temperature coefficient thermistor 1211 and a voltage divider resistor 1210. The thermistor 1211 is located between the PWM driving power supply 121 and the output terminal of the thermistor circuit 122.

[0119] Since the thermistor 1211 is located between the output terminal of the thermistor circuit 122 and the PWM drive power supply 121, the voltage amplitude at the output terminal of the thermistor circuit 122 is equal to the voltage amplitude across the voltage divider resistor. Furthermore, the resistance of the thermistor 1211 decreases as the temperature of the heat-dissipating component 30 increases; therefore, the voltage amplitude at the output terminal of the thermistor circuit 122 increases as the temperature of the heat-dissipating component 30 increases.

[0120] For example, when the temperature of the heat dissipation component 30 reaches 40 degrees, the resistance of the thermistor 1211 is the target resistance value. At this time, the voltage amplitude at the output terminal of the thermistor circuit 122 is greater than or equal to the voltage amplitude required to drive the heat dissipation component to work. For example, the voltage amplitude at the output terminal of the thermistor circuit 122 is the target voltage value.

[0121] Therefore, when the temperature of the component 30 to be cooled is low, such as below 40 degrees Celsius, the resistance of the thermistor 1211 is relatively large (greater than the target resistance), and the voltage at the output of the thermistor circuit 122 is relatively small (less than the target voltage). At this time, the voltage amplitude of the first voltage regulation signal output by the thermistor circuit 122 cannot reach the target value. This first voltage regulation signal can adjust the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component 20 to work. As the temperature of the component 30 to be cooled increases, the resistance of the thermistor 1211 continuously increases or decreases. At this time, the voltage amplitude at the output of the thermistor circuit 122 continuously increases, and correspondingly, the voltage amplitude of the second voltage regulation signal output by the thermistor circuit 122 also continuously increases. When the temperature of the heat dissipation component 30 rises to the preset temperature, the resistance of the thermistor 1211 reaches the target resistance value. At this time, the voltage value at the output terminal of the thermistor circuit 122 reaches the target voltage value. Correspondingly, the voltage amplitude of the second voltage regulation signal output by the thermistor circuit 122 also reaches the target voltage value. This second voltage regulation signal can adjust the amplitude of the high level of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component 20 to work.

[0122] Method 2: The PWM voltage regulation circuit includes a PWM drive power supply 121 and a temperature control voltage regulation circuit 123.

[0123] Optionally, such as Figure 5 and Figure 6 As shown, the temperature control and voltage regulation circuit 123 includes a temperature sensor (not shown in the figure), a temperature controller 1230, a voltage divider resistor 1231, and a variable resistor 1232.

[0124] The temperature sensor 1230 is used to collect the temperature of the component 30 to be cooled. The temperature controller 1230 is used to obtain the temperature of the component 30 to be cooled from the temperature sensor and adjust the resistance value of the variable resistor 1232 according to the obtained temperature of the component 30 to be cooled.

[0125] In addition, for the working principle and related explanations of the PWM drive power supply 121 and the voltage divider resistor 1231, please refer to Method 1 above, which will not be elaborated here.

[0126] The principle of this method is as follows: After the temperature controller 1230 obtains the temperature of the component 30 to be cooled from the temperature sensor, it adjusts the resistance value of the variable resistor 1232 according to the obtained temperature of the component 30 to be cooled. When the temperature of the component 30 to be cooled obtained by the temperature controller 1230 is lower than the preset temperature, the voltage amplitude of the output terminal of the temperature control voltage regulation circuit 123 is adjusted by adjusting the resistance value of the variable resistor 1232, so that the voltage amplitude of the first voltage regulation signal output by the temperature control voltage regulation circuit 123 is lower than the target value. This first voltage regulation signal can adjust the high-level voltage amplitude of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component 20 to work. Similarly, when the temperature obtained by the temperature controller 1230 reaches the preset temperature, the resistance value of the variable resistor 1232 can be adjusted so that the voltage amplitude of the second voltage regulation signal output by the temperature control voltage regulation circuit 123 is greater than or equal to the target voltage value. This second voltage regulation signal can adjust the high-level voltage amplitude of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component 20 to work.

[0127] It should be noted that the temperature sensor can be a temperature sensor originally configured on the server, or it can be a temperature sensor configured to implement the embodiments of this application. The embodiments of this application do not limit this.

[0128] It should be noted that adjusting the voltage amplitude at the output terminal of the temperature control voltage regulator circuit 123 by changing the resistance value of the variable resistor is the same principle as adjusting the voltage amplitude at the output terminal of the thermistor circuit 122 by changing the variable resistance value of the thermistor 1211. For details, please refer to the above method, which will not be elaborated here.

[0129] Accordingly, this application also provides a heat dissipation device, the structure of which can be referred to Figure 1 .

[0130] The heat dissipation device includes a drive circuit 10 and a heat dissipation component 20.

[0131] The driving circuit 10 is used to drive the heat dissipation component 20 to dissipate heat from the heat dissipation component 30.

[0132] For details regarding the drive circuit 10, please refer to the above embodiments; further details will not be provided here.

[0133] Accordingly, Figure 7 As shown in the figure, this application provides a heat dissipation control method, which includes:

[0134] S701: When the temperature of the component to be cooled is lower than the preset temperature, generate the target PWM signal and the first voltage regulation signal.

[0135] The first voltage regulation signal is used to adjust the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component.

[0136] S702: Adjusts the voltage amplitude of the high level of the target PWM signal to be less than the voltage amplitude required to drive the heat dissipation component.

[0137] S703: Outputs the adjusted target PWM signal to the heat dissipation component.

[0138] In this embodiment, when the temperature of the component to be cooled is lower than a preset temperature, the first voltage regulation signal generated by the driving circuit adjusts the voltage amplitude of the high level of the target PWM signal to be lower than the voltage amplitude required to drive the cooling component. Thus, when the cooling component receives the target PWM signal, since the voltage amplitude of the high level of the target PWM signal does not reach the voltage amplitude required to drive the cooling component, the cooling component will stop working regardless of the PWM signal's duty cycle. This avoids the PWM signal driving the cooling component to work when the temperature of the component to be cooled has not reached the required cooling temperature, thus helping to avoid wasted power.

[0139] Optionally, such as Figure 8 As shown in the embodiment of this application, another heat dissipation control method is provided, which includes:

[0140] S801: When the temperature of the component to be cooled is greater than or equal to the preset temperature, a target PWM signal and a second voltage regulation signal are generated.

[0141] S802: Adjusts the voltage amplitude of the high level of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component.

[0142] S803: Outputs the adjusted target PWM signal to the heat dissipation component.

[0143] It should be noted that the above Figure 7 or Figure 8 The heat dissipation control method shown, the specific implementation of the relevant steps, and the description of the relevant components can be found in the relevant description above, and will not be elaborated here.

[0144] In one implementation, the above Figure 7 or Figure 8 The heat dissipation control method shown can be used in the drive circuit of the above embodiments.

[0145] Accordingly, embodiments of this application also provide a heat dissipation control device, a chip, and a server.

[0146] In one implementation, the heat dissipation control device includes a corresponding unit for implementing the aforementioned heat dissipation control method. In another implementation, the heat dissipation control device includes a corresponding circuit for implementing the aforementioned heat dissipation control method.

[0147] The corresponding chip includes the aforementioned heat dissipation control device. The corresponding server includes the aforementioned chip. Or, the corresponding server includes the aforementioned heat dissipation control device.

[0148] The descriptions of the beneficial effects of the methods for driving chips, servers, and application circuits can all refer to the above descriptions of the beneficial effects of the corresponding driving circuits, and will not be repeated here.

[0149] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, the disclosure, and the appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0150] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. A driving circuit, characterized in that: The driving circuit is used to drive the heat dissipation component to work, and the driving circuit includes: A PWM generation circuit, wherein an output end of the PWM generation circuit is connected to a control end of the heat dissipation component, and the PWM generation circuit is used to output a target PWM signal to the control end of the heat dissipation component; A PWM voltage regulating circuit, wherein the output end of the PWM voltage regulating circuit is connected to the output end of the PWM generating circuit and the control end of the heat dissipation component. When the PWM generating circuit is not fully started or an abnormality occurs, the PWM voltage regulating circuit is used to output a first voltage regulating signal when the temperature of the component to be cooled is lower than a preset temperature. The first voltage regulating signal is used to adjust the high-level voltage amplitude of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work.

2. The circuit according to claim 1, characterized in that The voltage amplitude of the first voltage regulation signal is smaller than the voltage amplitude required to drive the heat dissipation component to work; The first voltage regulation signal is specifically used to adjust the high-level voltage amplitude of the target PWM signal to the voltage amplitude of the first voltage regulation signal.

3. The circuit according to claim 1, characterized in that The PWM voltage regulation circuit comprises: A PWM driving power supply, wherein the PWM driving power supply is used to output a power supply signal; a thermistor circuit, wherein the input end of the thermistor circuit is connected to the PWM driving power supply, the output end of the thermistor circuit is the output end of the PWM voltage regulating circuit, and the thermistor circuit is used to receive the power supply signal and adjust the power supply signal to the first voltage regulating signal before outputting it; The voltage amplitude of the first voltage regulation signal varies with the change of the resistance of the thermistor circuit, and the resistance of the thermistor circuit varies with the change of the temperature of the component to be cooled.

4. The circuit according to claim 3, characterized in that The thermal circuit comprises: A thermistor, the resistance of which changes with the temperature of the component to be cooled; A voltage-dividing resistor, the voltage-dividing resistor is connected in series with the thermistor, and the voltage-dividing resistor is a resistor with a constant resistance; Wherein, the output end of the thermistor circuit is located between the thermistor and the voltage divider resistor.

5. The circuit according to claim 4, characterized in that In the case where the thermistor is a positive temperature coefficient thermistor, the thermistor is located between an output terminal of the thermistor circuit and a ground terminal; or In the case where the thermistor is a negative temperature coefficient thermistor, the thermistor is located between the PWM drive power supply and the output end of the thermistor circuit.

6. The circuit according to any one of claims 1 to 5, characterized in that: The PWM generation circuit comprises: A PWM controller, wherein the PWM controller is used to generate a first PWM signal; A PWM isolation circuit is connected to the PWM controller, the PWM isolation circuit receives the first PWM signal, adjusts the first PWM signal to the target PWM signal and outputs it to the control end of the heat dissipation component; the frequency, period and duty cycle of the target PWM signal are the same as those of the first PWM signal.

7. The circuit according to claim 6, characterized in that The PWM controller is an out-of-band controller or a programmable logic device (PLD).

8. The circuit according to claim 7, characterized in that The PWM voltage regulation circuit is also used to output a second voltage regulation signal when the temperature of the component to be dissipated is greater than or equal to a preset temperature. The second voltage regulation signal is used to adjust the high-level voltage amplitude of the target PWM signal to be greater than or equal to the voltage amplitude required to drive the heat dissipation component to work.

9. A heat dissipation control method, characterized in that: For a driving circuit as claimed in any one of claims 1 to 8, the method comprising: When the temperature of the heat dissipation component is lower than a preset temperature, a target PWM signal and a first voltage regulation signal are generated; wherein the first voltage regulation signal is used to adjust the high-level voltage amplitude of the target PWM signal to be lower than the voltage amplitude required to drive the heat dissipation component to work; Adjusting the voltage amplitude of the high level of the target PWM signal to be smaller than the voltage amplitude required to drive the heat dissipation component to work; The adjusted target PWM signal is output to the heat dissipation component.

10. A heat dissipation device, characterized in that: include: A heat dissipation component, the heat dissipation component is used to dissipate heat from the component to be dissipated; The driving circuit according to any one of claims 1 to 8, wherein the driving circuit is used to drive the heat dissipation component to operate.

11. A server, characterized in that: include: Components to be cooled; A heat dissipation component, the heat dissipation component is used to dissipate heat from the component to be dissipated; The driving circuit according to any one of claims 1 to 8, wherein the driving circuit is used to drive the heat dissipation component to operate.

Images