Heat dissipation control circuit

Abstract

The utility model discloses a heat dissipation control circuit, which relates to the technical field of circuit control and comprises an NTC (Negative Temperature Coefficient) resistance circuit, a temperature control circuit and an operational amplifier, the output end of the NTC resistance circuit, the input end of the temperature control circuit and the inverted input end of the operational amplifier are connected; the output end of the temperature control circuit is connected with the output end of the operational amplifier; wherein the input end of the NTC resistance circuit is used as a first input end, and the voltage output connecting end of the operational amplifier is used as a first output end; the NTC resistance circuit comprises an NTC resistor or at least two NTC resistors connected in parallel. Through a specific circuit structure, the temperature control switch and the thermistor serve as the core, heat dissipation work is regulated and controlled in time according to the temperature condition, energy consumption is effectively reduced on the premise that the heat dissipation effect is guaranteed, and the actual requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a heat dissipation control circuit. BACKGROUND

[0002] At present, the heat dissipation demand of the heat generating structure is usually variable. If the forced air cooling scheme is used, the fixed speed fan is operated at the maximum heat dissipation design capacity, or the low temperature does not need to be dissipated, and the fan is started as soon as the power is on, which has no energy saving effect. Therefore, such heat generating structure needs a variable temperature control heat dissipation design: when the heat is low, the heat dissipation system is operated at low heat dissipation capacity with low energy consumption; when the heat is high, the heat dissipation system is operated at high heat dissipation capacity with high energy consumption. However, at present, there is a lack of a technical scheme that can better realize heat dissipation control in the related technical field.

[0003] Therefore, in order to meet the actual needs, the present application provides a heat dissipation control technology. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a heat dissipation control circuit, which takes temperature control switch and thermistor as the core through a specific circuit structure, and timely regulates and controls the heat dissipation work according to the temperature condition, effectively reduces the energy consumption under the premise of guaranteeing the heat dissipation effect, and meets the actual needs.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0006] The present application provides a heat dissipation control circuit, which comprises an NTC resistance circuit, a temperature control circuit and an operational amplifier;

[0007] The output end of the NTC resistance circuit, the input end of the temperature control circuit and the inverting input end of the operational amplifier are connected;

[0008] The output end of the temperature control circuit is connected with the output end of the operational amplifier; wherein,

[0009] The input end of the NTC resistance circuit is taken as a first input end, and the connection end of the voltage output of the operational amplifier is taken as a first output end;

[0010] The NTC resistance circuit comprises one NTC resistance or at least two parallel connected NTC resistances.

[0011] On the basis of the above technical scheme, a first protection resistance is connected in series with the NTC resistance of the NTC resistance circuit.

[0012] On the basis of the above technical scheme, the temperature control circuit comprises:

[0013] A first temperature control switch and a first resistance are connected in series;

[0014] a second resistor in parallel with the branch in which the first temperature control switch and the first resistor are located;

[0015] a connection end of an input end of the first temperature control switch and an input end of the second resistor as an input end of the temperature control circuit;

[0016] a connection end of an output end of the first resistor and an output end of the second resistor as an output end of the temperature control circuit.

[0017] On the basis of the above technical solution, the temperature control circuit comprises:

[0018] a temperature control first branch, the temperature control first branch comprising a first temperature control switch and a first resistor connected in series;

[0019] a temperature control second branch in parallel with the temperature control first branch, the temperature control second branch comprising a third resistor and a second resistor connected in series; wherein,

[0020] a connection point between the first temperature control switch and the first resistor and a connection point of the third resistor and the second resistor are connected in series;

[0021] a connection end of an input end of the first temperature control switch and an input end of the third resistor as an input end of the temperature control circuit;

[0022] a connection end of an output end of the first resistor and an output end of the second resistor as an output end of the temperature control circuit.

[0023] On the basis of the above technical solution, the temperature control circuit comprises a temperature control first branch, a temperature control second branch and a temperature control third branch in parallel;

[0024] the temperature control first branch comprising a first temperature control switch and a first resistor connected in series;

[0025] the temperature control second branch comprising a second temperature control switch and a second resistor connected in series;

[0026] the temperature control third branch comprising a third resistor;

[0027] a connection end of an input end of the first temperature control switch, an input end of the second temperature control switch and an input end of the third resistor as an input end of the temperature control circuit;

[0028] a connection end of an output end of the first resistor, an output end of the second resistor and an output end of the third resistor as an output end of the temperature control circuit.

[0029] On the basis of the above technical solution, the first output end is configured with a fan.

[0030] On the basis of the above technical solutions, the first output end is configured with a power drive circuit and a fan.

[0031] On the basis of the above technical solutions, the first input end is configured with a temperature judgment circuit.

[0032] On the basis of the above technical solutions, when the temperature control circuit comprises at least two temperature control branches, at least one of the temperature control branches is not configured with a temperature control switch.

[0033] Compared with the prior art, the application has the following advantages:

[0034] The application uses a specific circuit structure, takes the temperature control switch and the thermistor as the core, and timely controls the heat dissipation work according to the temperature condition, thereby effectively reducing the energy consumption under the premise of guaranteeing the heat dissipation effect and meeting the actual demand. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 FIG. 1 is a first circuit structure diagram of a heat dissipation control circuit of an embodiment of the application;

[0037] Figure 2 FIG. 2 is a second circuit structure diagram of a heat dissipation control circuit of an embodiment of the application;

[0038] Figure 3 FIG. 3 is a third circuit structure diagram of a heat dissipation control circuit of an embodiment of the application;

[0039] Figure 4 FIG. 4 is a fourth circuit structure diagram of a heat dissipation control circuit of an embodiment of the application;

[0040] Figure 5 FIG. 5 is a circuit structure diagram of a temperature judgment circuit in a heat dissipation control circuit of an embodiment of the application;

[0041] Figure 6 FIG. 6 is a circuit structure diagram of a power drive circuit in a heat dissipation control circuit of an embodiment of the application;

[0042] In the drawings:

[0043] 1, NTC resistor circuit; 2, temperature control circuit; 3, operational amplifier; 4, fan; 5, power drive circuit; 6, temperature judgment circuit. DETAILED DESCRIPTION

[0044] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] The embodiments of the present application are further described below in detail with reference to the drawings.

[0046] The embodiments of the present application provide a heat dissipation control circuit, which takes a temperature control switch and a thermistor as cores according to a specific circuit structure, timely regulates and controls heat dissipation work according to temperature conditions, effectively reduces energy consumption under the premise of guaranteeing heat dissipation effect, and meets actual demands.

[0047] In order to achieve the above technical effects, the general idea of the present application is as follows:

[0048] A heat dissipation control circuit, the circuit comprising an NTC resistance circuit 1, a temperature control circuit 2 and an operational amplifier 3:

[0049] The output end of the NTC resistance circuit 1, the input end of the temperature control circuit 2 and the inverting input end of the operational amplifier 3 are connected;

[0050] The output end of the temperature control circuit 2 and the output end of the operational amplifier 3 are connected; wherein,

[0051] The input end of the NTC resistance circuit 1 is taken as a first input end, and the connection end of the voltage output of the operational amplifier 3 is taken as a first output end;

[0052] The NTC resistance circuit 1 comprises one NTC resistance or at least two parallel NTC resistances.

[0053] The embodiments of the present application are further described below in detail with reference to the drawings.

[0054] Referring to Figures 1 to 6 The embodiments of the present application provide a heat dissipation control circuit, the circuit comprising an NTC resistance circuit 1, a temperature control circuit 2 and an operational amplifier 3;

[0055] The output end of the NTC resistance circuit 1, the input end of the temperature control circuit 2 and the inverting input end of the operational amplifier 3 are connected;

[0056] The output end of the temperature control circuit 2 and the output end of the operational amplifier 3 are connected; wherein,

[0057] The input end of the NTC resistance circuit 1 is as a first input end, and the connection end of the voltage output of the operational amplifier 3 is as a first output end.

[0058] The NTC resistance circuit 1 comprises one NTC resistance or at least two parallel NTC resistances.

[0059] It should be noted that the embodiment of the present application aims to design a variable temperature control heat dissipation technical solution: in low heating, the heat dissipation system is operated with low heat dissipation capacity and low energy consumption; in high heating, the heat dissipation system is operated with high heat dissipation capacity and high energy consumption.

[0060] The voltage control principle of the operational amplifier adder circuit will accumulate the branch currents of the input end and feedback the accumulation effect at the output end. When the voltages of the input end branches are the same, the resistance size of each branch determines the output voltage size. Generally, the power supply capacity of the adder is insufficient, and a power drive circuit needs to be added in the rear-end circuit.

[0061] In view of the above needs and principles, the embodiment of the present application proposes an NTC (Negative Temperature Coefficient thermistor) resistance circuit based on the operational amplifier adder circuit, which changes the resistance of the operational amplifier input end into the NTC resistance that can represent the variable resistance of the temperature status. When the temperature rises, the overall impedance of the input end will decrease, representing that the heat generation increases. According to the functional characteristics of the adder, the output voltage of the operational amplifier will increase, representing that the heat dissipation system will have a larger heat dissipation capacity. Through the subsequent power drive circuit at the output end, variable power is provided for the direct current motor, thereby generating variable speed, and realizing real-time heat dissipation demand.

[0062] In the embodiment of the present application, by using a specific circuit structure, the temperature control switch and the thermistor are taken as the core, the heat dissipation work is timely regulated according to the temperature condition, the energy consumption is effectively reduced under the premise of guaranteeing the heat dissipation effect, and the actual demand is met.

[0063] Further, the first protection resistance is connected in series with the NTC resistance of the NTC resistance circuit 1.

[0064] Further, the temperature control circuit 2 comprises:

[0065] The first temperature control switch and the first resistance are connected in series;

[0066] The second resistance is connected in parallel with the branch where the first temperature control switch and the first resistance are located;

[0067] The connection end of the input end of the first temperature control switch and the input end of the second resistance is as the input end of the temperature control circuit 2.

[0068] The connecting end of the output end of the first resistor and the output end of the second resistor is the output end of the temperature control circuit 2.

[0069] Further, the temperature control circuit 2 comprises:

[0070] A temperature control first branch, which comprises a first temperature control switch and a first resistor in series;

[0071] A temperature control second branch in parallel with the temperature control first branch, which comprises a third resistor and a second resistor in series; wherein,

[0072] The connecting point between the first temperature control switch and the first resistor is in series with the connecting point of the third resistor and the second resistor;

[0073] The connecting end of the input end of the first temperature control switch and the input end of the third resistor is the input end of the temperature control circuit 2;

[0074] The connecting end of the output end of the first resistor and the output end of the second resistor is the output end of the temperature control circuit 2.

[0075] Further, the temperature control circuit 2 comprises a temperature control first branch, a temperature control second branch and a temperature control third branch in parallel;

[0076] The temperature control first branch comprises a first temperature control switch and a first resistor in series;

[0077] The temperature control second branch comprises a second temperature control switch and a second resistor in series;

[0078] The temperature control third branch comprises a third resistor;

[0079] The connecting end of the input end of the first temperature control switch, the input end of the second temperature control switch and the input end of the third resistor is the input end of the temperature control circuit 2;

[0080] The connecting end of the output end of the first resistor, the output end of the second resistor and the output end of the third resistor is the output end of the temperature control circuit 2.

[0081] It should be noted that when the temperature control circuit 2 comprises a temperature control first branch and a temperature control second branch in parallel with the temperature control first branch, or when the temperature control circuit 2 comprises a temperature control first branch, a temperature control second branch and a temperature control third branch in parallel, that is, when the temperature control circuit 2 comprises at least two branches, there cannot be a temperature control switch on one of the branches, that is, there is only a resistor on at least one of the branches, otherwise when all the temperature control switches are open in specific work, the output voltage will be out of control.

[0082] Further, the first output end is configured with a fan 4.

[0083] If necessary, the fan 4 is selected as an EC (Electrical Commutation) fan.

[0084] Further, the first output end is configured with a power drive circuit 5 and the fan 4.

[0085] Further, the first input end is configured with a temperature judgment circuit 6.

[0086] As shown in the accompanying drawings of the specification Figures 1 to 4 , which are four different implementation forms of the technical scheme of the embodiment of the application, wherein,

[0087] S1 is a first temperature control switch, S2 is a second temperature control switch, R1 is a first resistor, R2 is a second resistor, and R3 is a third resistor.

[0088] IC1 is an operational amplifier 3.

[0089] RT1, RT2, RT3, and RTn are NTC resistors on the NTC resistor circuit 1, and R4, R5, and R6 are first protection resistors configured in series on the NTC resistors.

[0090] Specifically, based on the accompanying drawings of the specification Figures 1 to 4 , the technical details of the technical scheme of the embodiment of the application are described:

[0091] At present, a certain type of electrical cabinet with high integration has a DC 24V power supply, and multiple modules with obvious heating are assembled in the cabinet, so that the electrical cabinet needs forced cooling mode. The electrical cabinet is designed with an air inlet at the bottom and an air outlet at the top, and a fan motor is installed at the air outlet as a power device for air extraction. The cabinet body is almost airtight. The typical heating module transformer needs to work continuously.

[0092] As shown in the accompanying drawings of the specification Figure 1 , the temperature judgment circuit contains a thermistor, which controls the DC bus path only when the temperature reaches a certain value, such as 25℃. The DC bus is obtained from the DC 24V power supply in the cabinet. RT1, RT2, and RT3 are negative temperature coefficient thermistors, R25 = 9300Ω, and R65 = 2200Ω.

[0093] RT1, RT2, and RT3 are installed on the equipment at three temperature measuring points, respectively.

[0094] S1 is a surface mount temperature control switch installed on the outer surface of the transformer. It is disconnected when the installation position is 100℃. At this time, the corresponding cabinet temperature is 60℃, and the automatic recovery is closed at 95℃.

[0095] IC1 is an operational amplifier, current carrying capacity 20mA;

[0096] The power drive circuit is installed at the back end of IC1, the output voltage varies with the output terminal of the operational amplifier, and has an output capacity of 1A.

[0097] M is a DC fan that can work between 10VDC and 150VDC, the higher the voltage, the faster the speed, and the maximum working current does not exceed 1A.

[0098] R1 is a fixed resistor in series with S1, with a resistance of 4300Ω. R2 is a fixed resistor in parallel with the branch where R1 is located, and R1 and R2 have the same resistance, both in the feedback circuit of IC1. Finally, an adder circuit with three resistors at the input end and an input voltage of 24VDC, and two parallel resistors at the feedback end is formed.

[0099] After calculation, when the control temperature is 25℃ to 65℃, if S1 is always on, the output voltage range of the adder circuit is 17VDC-70VDC; if S1 is off, the output voltage range of the adder circuit is 34VDC-140VDC. Both meet the electrical parameter requirements of the loop components. Figure 1 The corresponding circuit corresponding component parameter input voltage calculation table is shown in Table 1 below.

[0100]

[0101] As shown in the drawings of the specification Figure 2 To facilitate the selection of DC motor and shorten the working voltage range of DC motor, a fixed resistor R3 can be added to the circuit of the feedback branch without S1 in series. When S1 is not in action, R3 is bypassed by S1; when S1 is in action, S1 is bypassed and R3 is in series in the feedback loop and forms a feedback loop with R1 and R2 in parallel. Through reasonable design of R1-R3 parameters, the requirement of shortening the output voltage range of the adder circuit can be met. For example, R1=4300Ω, R2=4300Ω, R3=1000Ω; at this time Figure 2 The circuit corresponding component parameter output voltage calculation table is shown in Table 2 below, and the output voltage range is controlled at 24VDC-103VDC when S1 is off, completing the reduction of the output voltage range. The drawings of the specification Figure 2 The corresponding circuit corresponding component parameter output voltage calculation table is shown in Table 2 below.

[0102] Table 2

[0103]

[0104]

[0105] As shown in the drawings of the specification Figure 3As shown, if the input voltage at the input end of the adder is greater than the input voltage of the operational amplifier, a voltage dividing resistor such as R4 can be connected in series with each NTC resistor branch, such as the R4 connected in series with the R1 branch.

[0106] At the input end of the adder, more NTC sensors RTn can be added for monitoring the required measuring points.

[0107] A plurality of patch temperature control switches can also be designed on the feedback branch for monitoring important heat generating components, and at least one feedback branch is kept without a temperature control switch so that the impedance of the feedback branch is controllable.

[0108] As shown in the accompanying drawings Figure 4 As shown, if the operational amplifier of the adder circuit has sufficient load capacity, the power driving circuit can be omitted.

[0109] In summary, the technical scheme of the embodiments of the present application also has the following technical details:

[0110] The temperature judgment circuit configured in the technical scheme of the embodiments of the present application has a temperature monitoring function, and power supply can be provided only after the circuit reaches a certain temperature value.

[0111] The direct current input power source configured in the technical scheme of the embodiments of the present application is a common voltage source for the input end of the adder, and the voltage amplitude of each input end resistor branch is the same.

[0112] The NTC resistor in the technical scheme of the embodiments of the present application is a resistor in each branch at the input end of the adder, which is used as a temperature monitoring point and is installed at each heat source.

[0113] The temperature control switch of the feedback branch in the technical scheme of the embodiments of the present application is used in at least one feedback resistor branch, and at least one branch of the feedback branch is not installed with a temperature control switch.

[0114] The resistor of the feedback branch in the technical scheme of the embodiments of the present application is a fixed resistor.

[0115] The power driving circuit of the feedback branch in the technical scheme of the embodiments of the present application aims to solve the problem of insufficient driving capacity of the adder, and if the power supply capacity of the adder meets the power demand of the direct current motor, the driving circuit can be omitted.

[0116] The direct current motor in the technical scheme of the embodiments of the present application is characterized in that the speed is in a positive proportional relationship with the power supply voltage.

[0117] Furthermore, in order to avoid low temperature start of the adder circuit and the fan in the subsequent stage, a temperature judgment circuit is designed at the power supply input end, and power supply is allowed to the input end of the adder only when the required temperature is reached.

[0118] In addition, the temperature control switch of the feedback branch is installed on the heat generating component which is monitored and protected, and the temperature control switch keeps open under normal conditions. The temperature control switch has automatic recovery function. When the temperature control switch is disconnected, the fixed resistor of the branch is opened, and the feedback resistor of the other branch works.

[0119] It should be noted that the fan 4, the power driving circuit 5 and the temperature judgment circuit 6 can be replaced by other components as long as the corresponding functions can be completed.

[0120] The direct current input power supply in the technical scheme of the embodiment of the application generally uses a low voltage direct current power supply which is convenient and available in the system.

[0121] When the voltage of the convenient and available direct current power supply is relatively high, the NTC branch is designed in series with a fixed resistor. Finally, the voltage at the output end of the adder is ensured to be within an effective lower voltage, so as to prevent the adder from being damaged.

[0122] The NTC resistor in the technical scheme of the embodiment of the application will decrease when the temperature at the installation position of the measuring point increases, which represents that the heat generation of the measuring point component becomes larger. When other NTC resistors do not change, the voltage at the output end will become larger, and finally the speed of the heat dissipation fan becomes faster, and the heat dissipation capacity is improved.

[0123] The temperature control switch in the technical scheme of the embodiment of the application is installed on the heat generating component which is monitored and protected, and the temperature change of the component can be given priority to improve. When the temperature control switch acts, the output voltage generated by the disconnection of the corresponding feedback branch is greater than the voltage accumulation effect of the NTC resistor of the input branch. The effect can ignore the problem that the accumulation of the NTC resistor of the input branch and the temperature change of the heat generating object is inconsistent.

[0124] The technical scheme of the embodiment of the application is based on the adder circuit, and the resistance change of the input end and the feedback end is innovated through engineering design, so as to realize the engineering application of adjusting the required output voltage.

[0125] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0126] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0127] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A heat dissipation control circuit, characterized in that: The circuit comprises an NTC resistor circuit (1), a temperature control circuit (2) and an operational amplifier (3); The output end of the NTC resistor circuit (1), the input end of the temperature control circuit (2), and the inverting input end of the operational amplifier (3) are connected; The output end of the temperature control circuit (2) is connected to the output end of the operational amplifier (3); wherein, The input end of the NTC resistance circuit (1) serves as a first input end, and the voltage output connection end of the operational amplifier (3) serves as a first output end; The NTC resistor circuit (1) comprises one NTC resistor or at least two NTC resistors connected in parallel.

2. The heat dissipation control circuit according to claim 1, wherein: A first protection resistor is configured in series with the NTC resistor of the NTC resistor circuit (1).

3. The heat dissipation control circuit according to claim 1, wherein: The temperature control circuit (2) comprises: A first temperature-controlled switch and a first resistor connected in series; a second resistor connected in parallel with the branch where the first temperature-controlled switch and the first resistor are located; The connection end between the input end of the first temperature-controlled switch and the input end of the second resistor serves as the input end of the temperature-controlled circuit (2); The connection end of the output end of the first resistor and the output end of the second resistor serves as the output end of the temperature control circuit (2).

4. The heat dissipation control circuit according to claim 1, wherein: The temperature control circuit (2) comprises: a first temperature-controlled branch, the first temperature-controlled branch comprising a first temperature-controlled switch and a first resistor connected in series; A second temperature-controlled branch connected in parallel with the first temperature-controlled branch, wherein the second temperature-controlled branch includes a third resistor and a second resistor connected in series; wherein, The connection point between the first temperature-controlled switch and the first resistor is connected in series with the connection point between the third resistor and the second resistor; The connection end between the input end of the first temperature-controlled switch and the input end of the third resistor serves as the input end of the temperature-controlled circuit (2); The connection end of the output end of the first resistor and the output end of the second resistor serves as the output end of the temperature control circuit (2).

5. The heat dissipation control circuit according to claim 1, wherein: The temperature control circuit (2) comprises a first temperature control branch, a second temperature control branch and a third temperature control branch connected in parallel; The first temperature-controlled branch includes a first temperature-controlled switch and a first resistor connected in series; The second temperature-controlled branch includes a second temperature-controlled switch and a second resistor connected in series; The temperature control third branch includes a third resistor; The input end of the first temperature-controlled switch, the input end of the second temperature-controlled switch and the connection end of the input end of the third resistor serve as the input end of the temperature-controlled circuit (2); The output end of the first resistor, the output end of the second resistor and the connection end of the output end of the third resistor serve as the output end of the temperature control circuit (2).

6. The heat dissipation control circuit according to claim 1, wherein: The first output end is equipped with a fan (4).

7. The heat dissipation control circuit according to claim 1, wherein: The first output end is equipped with a power drive circuit (5) and a fan (4).

8. The heat dissipation control circuit according to claim 1, wherein: The first input end is provided with a temperature judging circuit (6).

9. The heat dissipation control circuit according to claim 7, wherein: The fan (4) is an EC fan.

10. The heat dissipation control circuit according to claim 4 or 5, wherein: When the temperature control circuit (2) comprises at least two temperature control branches, at least one of the temperature control branches is not equipped with a temperature control switch.

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