Fan speed control method, device, equipment and readable storage medium

Abstract

The present application provides a fan speed control method, device, equipment and readable storage medium. The method provided in the present application can control the fan to stop and run through the fan speed control circuit, which can effectively reduce the heat generated by the fan and improve work efficiency. At the same time, the fan speed control circuit provided in the embodiment of the present application has a low material cost, which can effectively increase the life of the fan and reduce the failure rate of the product. Furthermore, the fan speed control circuit provided in the embodiment of the present application can effectively control the rotation speed of the fan during operation, avoid the fan from rotating at a continuous high speed, and while protecting the fan, it can also reduce the noise caused by the fan and improve the user experience of the product.

Description

Technical Field

[0001] The present application relates to the field of temperature control technology, and in particular to a fan speed control method, device, equipment and readable storage medium. Background Art

[0002] With the development of science and technology, temperature control technology has been developing better and better. In actual application, in the temperature control of power amplifiers, a temperature control switch or a comparator is usually used to detect the resistance change of the thermistor to achieve temperature control of the power amplifier, and the driving mode of the two-speed or multi-speed temperature control fan speed regulation is a DC voltage, which is suitable for driving fans of different power. However, the solution of using a temperature control switch or a comparator to detect the resistance change of the thermistor to achieve two-speed or multi-speed temperature control fan speed regulation has a simple control method, but cannot achieve linear control of the fan speed, the fan working noise is difficult to control, and the main power supply must be stabilized, and the circuit cost is high. Summary of the Invention

[0003] The present application aims to solve at least one of the above-mentioned technical defects. In view of this, the present application provides a fan speed control method, device, equipment and readable storage medium to solve the technical defect of high cost of fan speed control circuit in the prior art.

[0004] A fan speed control method, comprising:

[0005] The preset fan speed control circuit is used to set a low voltage that stops the target fan;

[0006] Using the thermistor of the fan speed control circuit to linearly control the speed of the target fan;

[0007] Set the minimum starting voltage and maximum supply voltage of the target wind turbine.

[0008] Preferably, the setting of a low voltage to stop the target fan by a preset fan speed control circuit includes:

[0009] The low voltage that stops the target fan is set by the chip with adjustable output voltage of the fan speed control circuit.

[0010] Preferably, the linearly controlling the speed of the target fan by using the thermistor of the fan speed control circuit includes:

[0011] The output voltage of the target fan speed control circuit is set according to the thermistor of the fan speed control circuit and the ambient temperature of the target fan.

[0012] in,

[0013] When the ambient temperature of the target fan is higher, the impedance of the thermistor is smaller, and the output voltage of the fan speed control circuit is increased.

[0014] Preferably, setting the minimum starting voltage of the target wind turbine includes:

[0015] Determining the sum of the fourth resistor and the fifth resistor of the fan speed control circuit;

[0016] determining a first ratio of a sum of a fourth resistor and a fifth resistor of the fan speed control circuit to the fifth resistor;

[0017] Setting the starting voltage threshold of the fan speed control circuit to the product of the transistor junction voltage of the fan speed control circuit and the first ratio;

[0018] The starting voltage of the target fan is set to be lower than the first starting voltage threshold of the fan speed control circuit, and the driving output voltage of the target fan is set to be higher than the first starting voltage threshold of the fan speed control circuit.

[0019] Preferably, setting the maximum power supply voltage of the target wind turbine includes:

[0020] When the target fan drive output voltage reaches the maximum supply voltage of the target fan, the divided voltage of the sixth resistor and the seventh resistor in the fan speed control circuit reaches the conduction threshold of the second transistor, so that the second transistor and the fourth transistor work in the conduction state, and the eighth resistor is incorporated into the fan speed control circuit to reduce the impedance across the first resistor of the fan speed control circuit;

[0021] reducing the output voltage of the target fan drive so that the second transistor and the fourth transistor of the fan speed control circuit operate in a cut-off state;

[0022] The original impedance of the first resistor of the fan speed control circuit is restored so that the output voltage of the target fan drive reaches the maximum output voltage again.

[0023] Preferably, it also includes:

[0024] When the divided voltage of the fourth resistor and the fifth resistor of the fan speed control circuit is infinitely close to the transistor junction voltage of the fan speed control circuit, the ninth resistor, the tenth resistor, the eleventh resistor and the third transistor are connected to the fan speed control circuit;

[0025] When the low voltage of the target wind turbine starts the first transistor of the wind turbine speed control circuit to start slightly conducting, the third transistor of the wind turbine speed control circuit is triggered to conduct, so that the bias of the ninth resistor of the wind turbine speed control circuit is connected to the base of the first transistor;

[0026] Accelerating the complete conduction of the first transistor of the fan speed control circuit to reduce the first starting threshold of the fan speed control circuit to a second starting threshold, wherein the first starting threshold is greater than the second starting threshold;

[0027] The ninth resistor is set so that the drive output voltage of the target fan is greater than or equal to the first starting threshold of the fan speed control circuit, and the second starting threshold is greater than the starting voltage of the target fan.

[0028] Preferably, it also includes:

[0029] When the ambient temperature of the target fan decreases and the resistance impedance of the second resistor of the fan speed control circuit increases, determining whether the drive output voltage of the target fan is lower than the second starting threshold of the fan speed control circuit;

[0030] If the drive output voltage of the target fan is lower than the second starting threshold of the fan speed control circuit, the first transistor of the fan speed control circuit begins to be cut off;

[0031] When the first transistor of the fan speed control circuit starts to be cut off, causing the third transistor of the fan speed control circuit to be cut off, disconnecting the bias of the ninth resistor of the fan speed control circuit on the base of the first transistor of the fan speed control circuit;

[0032] Accelerating the complete cutoff of the first transistor of the fan speed control circuit, and changing the starting threshold of the fan speed control circuit from the second starting threshold to the first starting threshold;

[0033] When the first starting threshold of the fan speed control circuit is greater than the second starting threshold and greater than the starting voltage of the target fan, the target fan is immediately turned off.

[0034] Preferably, the wind turbine speed control circuit includes: a first resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first transistor, a second transistor, a third transistor, a fourth transistor, a first diode, a step-down chip, and a target wind turbine;

[0035] in,

[0036] The second resistor is a thermistor;

[0037] The fourth resistor, the fifth resistor, the fifth capacitor and the first transistor constitute the minimum starting voltage of the target wind turbine;

[0038] When the output voltage of the fan speed control circuit reaches the maximum power supply voltage of the target fan, the divided voltage of the sixth resistor and the seventh resistor reaches the conduction threshold of the second transistor, so that the second transistor and the fourth transistor operate in the on state, and the eighth resistor is incorporated into the first resistor to reduce the impedance across the first resistor, thereby reducing the output voltage of the fan speed control circuit. At this moment, the second transistor and the fourth transistor operate in the cut-off state; the first resistor restores its original impedance, so that the fan speed control circuit reaches the maximum output voltage again.

[0039] A wind turbine speed control device includes: one or more processors, and a memory;

[0040] The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the fan speed control method as described in any one of the above descriptions are implemented.

[0041] A readable storage medium stores computer-readable instructions, which, when executed by one or more processors, enable the one or more processors to implement the steps of the fan speed control method as described in any one of the above descriptions.

[0042] It can be seen from the technical solution introduced above that the method provided in the embodiment of the present application can set a low voltage to stop the target fan through a preset fan speed control circuit; and use the thermistor of the fan speed control circuit to linearly control the speed of the target fan. By linearly controlling the fan speed through the characteristics of the thermistor, the rotation speed of the fan can be effectively controlled, so that the temperature and noise of the fan can be effectively controlled; at the same time, the minimum starting voltage and the maximum power supply voltage of the target fan can also be set. Setting the minimum starting voltage and the maximum power supply voltage of the target fan can effectively avoid the damage to the fan caused by excessive output voltage of the circuit due to excessive temperature, and can effectively improve the service life of the fan.

[0043] From the above introduction, it can be seen that the method provided in the embodiment of the present application controls the fan stop and operation through the fan speed control circuit, which can effectively reduce the heat generated by the fan and improve work efficiency. At the same time, the fan speed control circuit provided in the embodiment of the present application has a low material cost, which can effectively increase the life of the fan and reduce the failure rate of the product. Furthermore, the fan speed control circuit provided in the embodiment of the present application can effectively control the rotation speed of the fan during operation, avoiding the fan from rotating at a continuous high speed. While protecting the fan, it can also reduce the noise caused by the fan and improve the user experience of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 A flow chart of a method for implementing fan speed control provided in an embodiment of the present application;

[0046] Figure 2 This is a schematic diagram of a fan speed control circuit structure that can achieve low-cost and effective control of fan temperature according to an embodiment of the present application;

[0047] Figure 3 This is a schematic diagram of a basic DC-DC circuit structure capable of adjusting output voltage according to an embodiment of the present application;

[0048] Figure 4 This is a hardware structure block diagram of a fan speed control device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] Given that most of the current fan speed control solutions are difficult to adapt to complex and changeable business needs, the applicant has studied a fan speed control solution. This fan speed control method controls the fan stop and operation through a fan speed control circuit, which can effectively reduce the heat generation of the fan and improve work efficiency. At the same time, the fan speed control circuit provided in the embodiment of the present application has a low material cost, which can effectively increase the life of the fan and reduce the failure rate of the product. Furthermore, the fan speed control circuit provided in the embodiment of the present application can effectively control the rotation speed of the fan during operation, avoiding the fan from rotating at a continuous high speed. While protecting the fan, it can also reduce the noise caused by the fan and improve the product's user experience.

[0051] The methods provided in the embodiments of the present application can be used in a variety of general-purpose or specialized computing device environments or configurations, such as personal computers, server computers, handheld or portable devices, tablet devices, multi-processor devices, and distributed computing environments including any of the above.

[0052] An embodiment of the present application provides a fan speed control method, which can be applied to various power amplifier management systems or fan temperature adaptive management systems, and can also be applied to various computer terminals or smart terminals. Its execution entity can be the processor or server of the computer terminal or smart terminal.

[0053] The following combination Figure 1 , introduces the process of the fan speed control method given in the embodiment of the present application, such as Figure 1 As shown, the process can include the following steps:

[0054] In step S101 , a low voltage is set to stop a target fan through a preset fan speed control circuit.

[0055] Specifically, in actual application, a temperature-controlled switch or a comparator can usually be used to detect the resistance change of a thermistor to achieve temperature control of the temperature-controlled fan.

[0056] Generally speaking, two or more speed temperature-controlled fans are driven by DC voltage. The DC voltage drive method is suitable for driving fans of different powers, and the circuit cost is moderate.

[0057] Analog circuits can also be used to achieve linear temperature-controlled fan speed regulation through changes in the resistance of thermistors. The drive method is DC voltage, which can effectively control the noise of the fan, and the main power supply of the fan does not require voltage stabilization. However, the circuit cost of this speed control solution is the highest.

[0058] You can also use an MCU (single-chip microcomputer) to obtain the temperature through a thermistor or other sensor, and adjust the square wave duty cycle in real time to directly drive the fan. It can be multi-speed controlled or linearly controlled, and can also well control the fan noise. However, the circuit cost of this speed control solution is the highest.

[0059] Although the above solutions can effectively control the temperature of the fan, these methods also have certain shortcomings, as follows:

[0060] A temperature-controlled switch or comparator is used to detect the resistance change of the thermistor to achieve a two-speed or multi-speed temperature-controlled fan speed regulation solution. Although this fan speed control solution is simple to control, it cannot achieve linear control of the fan speed. The noise generated by the fan is difficult to control, and the main power supply of the fan must be stabilized, which invisibly increases the circuit cost of the fan speed control.

[0061] The solution of using analog circuits to achieve linear temperature-controlled fan speed regulation through the resistance change of thermistors has low working efficiency. In order to control the heat generation, its operating voltage range is relatively narrow, which is not suitable for driving fans with slightly larger power and can be adapted to relatively few scenarios.

[0062] An MCU (single-chip microcomputer) is used to obtain temperature through a thermistor or other sensor, and the square wave duty cycle is adjusted in real time to directly drive the fan. Since the fan is directly driven by a square wave, the fan leads and the small-signal audio amplifier circuit near the fan are easily interfered with, causing the power amplifier output noise. In addition to the high cost of the MCU, this solution requires a regulated power supply, which further increases the cost of the fan speed control circuit.

[0063] Therefore, in order to reduce the cost of fan speed control and improve work efficiency, an embodiment of the present application provides a fan speed control circuit. The fan speed control circuit provided in the embodiment of the present application can be used to set a low voltage to stop the target fan, so as to avoid the target fan from rotating at high speed uncontrollably, thereby effectively ensuring the working efficiency and service time of the fan.

[0064] For example,

[0065] At room temperature, the fan speed control circuit can be used to set a low-voltage output state that can stop the fan. When the output voltage of the fan reaches the set low-voltage output state for stopping the fan, the fan can stop, avoiding the fan from rotating at high speed all the time and the temperature rising continuously.

[0066] in,

[0067] The fan speed control circuit provided in the embodiment of the present application can be as follows Figure 2 As shown, Figure 2 The invention provides an example of a fan speed control circuit that can effectively control the fan temperature at low cost.

[0068] like Figure 2 As shown, the fan speed control circuit provided in the embodiment of the present application includes:

[0069] A first resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first transistor, a second transistor, a third transistor, a fourth transistor, a first diode, a step-down chip, and a target wind turbine;

[0070] in,

[0071] The second resistor may be a thermistor;

[0072] The fourth resistor, the fifth resistor, the fifth capacitor and the first transistor can constitute the minimum starting voltage of the target wind turbine;

[0073] When the output voltage of the fan speed control circuit reaches the maximum power supply voltage of the target fan, the voltage divided by the sixth resistor and the seventh resistor can reach the conduction threshold of the second transistor, so that the second transistor and the fourth transistor can operate in the on state. At this time, the eighth resistor is incorporated into the first resistor, which can reduce the impedance across the first resistor, thereby reducing the output voltage of the fan speed control circuit. At this moment, the second transistor and the fourth transistor operate in the cut-off state; the first resistor can restore the original impedance, so that the fan speed control circuit can reach the maximum output voltage again.

[0074] Step S102 : linearly controlling the speed of the target fan by utilizing the thermistor of the fan speed control circuit.

[0075] Specifically, it can be seen from the technical solutions introduced above that the embodiment of the present application provides a fan speed control circuit, which can be used to effectively control the fan temperature at low cost.

[0076] Depend on Figure 2 It can be seen that the fan speed control circuit includes a thermistor. In actual application, the impedance of the thermistor may change as the temperature of the environment in which it is located changes.

[0077] For example,

[0078] The higher the ambient temperature of the thermistor, the smaller the impedance of the thermistor will be. In actual application, if Figure 2 In the fan speed control circuit shown, when the impedance of the thermistor becomes smaller and smaller, the output voltage of the fan speed control circuit will gradually increase as the impedance of the thermistor becomes smaller.

[0079] Therefore, by utilizing the temperature sensitivity of the thermistor, linear control of the target fan speed can be achieved.

[0080] Therefore, the characteristics of the thermistor of the fan speed control circuit can be used to achieve linear control of the speed of the target fan, so that the speed of the target fan can be adjusted according to actual application needs, avoiding keeping the target fan in a high-speed rotation state all the time, and effectively achieving the purpose of intelligently controlling the temperature of the target fan.

[0081] Step S103: setting the minimum starting voltage and the maximum supply voltage of the target wind turbine.

[0082] Specifically, as can be seen from the above introduction, the embodiments of the present application can provide a fan speed control circuit that can intelligently control the fan speed.

[0083] In actual applications, in order to extend the service life of the fan, in addition to linearly controlling the fan speed, it is also necessary to reasonably set the fan's minimum starting voltage and maximum supply voltage. This allows for intelligent control of the fan's temperature while also ensuring the fan meets the power amplifier's heat dissipation requirements. If the fan's supply voltage is higher than the fan's own withstand voltage, it will cause damage. If the fan is at the critical point of starting when powered by a linear low-voltage power supply and cannot start normally, it may also cause the fan to heat up. Prolonged operation in this state may also cause damage to the fan and the temperature will also be very high.

[0084] Therefore, in order to prevent damage to the fan, the fan speed control circuit provided in the embodiment of the present application can also be used to set the minimum starting voltage and the maximum supply voltage of the target fan.

[0085] It can be seen from the technical solution introduced above that the method provided in the embodiment of the present application can set a low voltage to stop the target fan through a preset fan speed control circuit; and use the thermistor of the fan speed control circuit to linearly control the speed of the target fan. By linearly controlling the fan speed through the characteristics of the thermistor, the rotation speed of the fan can be effectively controlled, so that the temperature and noise of the fan can be effectively controlled; at the same time, the minimum starting voltage and the maximum power supply voltage of the target fan can also be set. Setting the minimum starting voltage and the maximum power supply voltage of the target fan can effectively avoid the damage to the fan caused by excessive output voltage of the circuit due to excessive temperature, and can effectively improve the service life of the fan.

[0086] From the above introduction, it can be seen that the method provided in the embodiment of the present application controls the fan stop and operation through the fan speed control circuit, which can effectively reduce the heat generated by the fan and improve work efficiency. At the same time, the fan speed control circuit provided in the embodiment of the present application has a low material cost, which can effectively increase the life of the fan and reduce the failure rate of the product. Furthermore, the fan speed control circuit provided in the embodiment of the present application can effectively control the rotation speed of the fan during operation, avoiding the fan from rotating at a continuous high speed. While protecting the fan, it can also reduce the noise caused by the fan and improve the user experience of the product.

[0087] As can be seen from the above description, the method provided in the embodiment of the present application can set a low voltage that stops the target fan through a preset fan speed control circuit. The following describes the process, which may include the following:

[0088] like Figure 2 As shown, the fan speed control circuit provided in the embodiment of the present application may include a chip that can adjust the output voltage, wherein the chip that can adjust the output voltage may be a DC_DC chip, which can adjust the output voltage of the fan speed control circuit.

[0089] like Figure 3 As shown, a DC_DC basic circuit provided in an embodiment of the present application can adjust the output voltage.

[0090] like Figure 3 As shown, the output voltage Vout of the DC_DC circuit is achieved by setting the voltage divider ratio of the resistor R1 and the resistor R2, and its calculation formula is:

[0091]

[0092] Therefore, in actual application, the chip with adjustable output voltage of the fan speed control circuit can be used to set a low voltage that can stop the target fan, so as to ensure that the target fan can automatically stop rotating when its voltage state reaches the low voltage state for stopping during actual application.

[0093] Furthermore, as can be seen from the above description, the fan speed control circuit provided in the embodiment of the present application may include a thermistor, and the method provided in the embodiment of the present application may use the thermistor of the fan speed control circuit to linearly control the speed of the target fan. The following describes the process, which may include the following:

[0094] From the above introduction, we can see that in actual application, the impedance of the thermistor will change as the temperature of the environment in which it is located changes.

[0095] For example,

[0096] The higher the ambient temperature of the thermistor, the smaller the impedance of the thermistor will be. In actual application, if Figure 2 In the fan speed control circuit shown, when the impedance of the thermistor becomes smaller and smaller, the output voltage of the fan speed control circuit will gradually increase as the impedance of the thermistor becomes smaller.

[0097] Therefore, by utilizing the temperature sensitivity of the thermistor, linear control of the target fan speed can be achieved.

[0098] Therefore, the method provided in the embodiment of the present application can set the output voltage of the target fan speed control circuit according to the thermistor of the fan speed control circuit and the ambient temperature of the target fan.

[0099] in,

[0100] When the ambient temperature of the target fan is higher, the impedance of the thermistor will be smaller, and the output voltage of the fan speed control circuit can be increased.

[0101] It can be seen from the technical solutions introduced above that the embodiments of the present application provide a fan speed control circuit that can adjust the output voltage, thereby enabling the fan to automatically stop, which is beneficial to protecting the service life of the fan and reducing costs.

[0102] As can be seen from the above description, the method provided in the embodiment of the present application can set the minimum starting voltage of the target wind turbine. The following describes the process, which may include the following steps:

[0103] Step S201 : determining the sum of the fourth resistor and the fifth resistor of the fan speed control circuit.

[0104] Specifically, as can be seen from the above introduction, the fan speed control circuit provided in the embodiment of the present application may include a fourth resistor R4 and a fifth resistor R5.

[0105] Depend on Figure 2 As shown, the fan speed control circuit provided in the embodiment of the present application uses a loop composed of several components including a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, and a first transistor Q1 to set the minimum starting voltage of the fan.

[0106] The starting threshold of the fan speed control circuit provided in the embodiment of the present application can be set to Vth1;

[0107] The target fan drive output voltage may be set to Vout, wherein the target fan start voltage may be set to V1;

[0108] like Figure 2 As shown, the fan speed control circuit may further include a PN transistor, and the junction voltage of the PN transistor of the fan speed control circuit may be set to Vpn;

[0109] It can be seen from this that if the fan speed control circuit provided in the embodiment of the present application is used to control the target fan, the sum of R4 and R5 in the fan speed control circuit provided in the embodiment of the present application can affect the minimum starting voltage of the target fan.

[0110] Therefore, in order to set the minimum starting voltage of the target fan, the sum of R4 and R5 of the fan speed control circuit can be determined.

[0111] Step S202 : determining a first ratio of the sum of the fourth resistor and the fifth resistor of the fan speed control circuit to the fifth resistor.

[0112] Specifically, from the above introduction, it can be seen that if the fan speed control circuit provided in the embodiment of the present application is used to control the target fan, the ratio of the sum of R4 and R5 of the fan speed control circuit provided in the embodiment of the present application to R5 can affect the minimum starting voltage of the target fan.

[0113] Therefore, in order to set the minimum starting voltage of the target wind turbine, a first ratio of the sum of R4 and R5 of the wind turbine speed control circuit to R5 may be determined.

[0114] Step S203: setting the starting voltage threshold of the fan speed control circuit to the product of the transistor junction voltage of the fan speed control circuit and the first ratio.

[0115] Specifically, from the above introduction, it can be seen that if the fan speed control circuit provided in the embodiment of the present application is used to control the target fan, then the ratio of the sum of R4 and R5 of the fan speed control circuit provided in the embodiment of the present application to R5 and the first ratio of the sum of R4 and R5 of the fan speed control circuit to R5 can affect the minimum starting voltage of the target fan.

[0116] Therefore, in order to set the minimum starting voltage of the target wind turbine, the starting voltage threshold of the wind turbine speed control circuit may be set to the product of the transistor junction voltage of the wind turbine speed control circuit and the first ratio.

[0117] For example,

[0118] The starting voltage threshold Vth1 of the fan speed control circuit can be set to:

[0119]

[0120] Step S204 : setting the starting voltage of the target fan to be less than the first starting voltage threshold of the fan speed control circuit, and making the driving output voltage of the target fan greater than the first starting voltage threshold of the fan speed control circuit.

[0121] Specifically, from the above introduction, it can be seen that the embodiment of the present application can determine that the starting voltage threshold of the fan speed control circuit is set to the product of the transistor junction voltage of the fan speed control circuit and the first ratio.

[0122] Furthermore, when the drive output voltage of the target fan is greater than the starting voltage of the fan speed control circuit, and the starting voltage of the fan speed control circuit is greater than the starting voltage of the fan, the fan can be guaranteed to start normally at low voltage, effectively avoiding the fan being at the critical starting point when the linear low voltage power supply is applied. If the fan cannot start normally, it may cause self-heating, and being in this state for a long time will cause damage to the fan.

[0123] like Figure 2As shown in the fan speed control circuit shown in the figure, in actual application, due to the characteristics of the transistor, when the divided voltage of the fourth resistor R4 and the fifth resistor R5 is infinitely close to the voltage Vpn of the PN transistor, there will still be a linear range. In extreme cases, it may also cause the fan to be unable to start for a long time. Therefore, in order to avoid the fan being unable to start normally and causing excessive temperature, when the divided voltage of the fourth resistor R4 and the fifth resistor R5 of the fan speed control circuit is infinitely close to the transistor junction voltage of the fan speed control circuit, the fan speed control circuit can be connected with the ninth resistor R9 and the tenth resistor R10. Components such as resistor R10, eleventh resistor R11 and third transistor Q3 can trigger the third transistor Q3 of the fan speed control circuit to turn on when the first transistor Q1 of the fan speed control circuit starts to be slightly turned on at the low voltage start-up of the target fan, so that the bias of the ninth resistor of the fan speed control circuit is connected to the base of the first transistor Q1; and accelerate the first transistor Q1 of the fan speed control circuit to be fully turned on, so as to reduce the first starting threshold of the fan speed control circuit to the second starting threshold, wherein the first starting threshold of the fan speed control circuit is greater than the second starting threshold.

[0124] When the starting voltage threshold of the fan speed control circuit drops from the first starting threshold to the second starting threshold, the ninth resistor R9 of the fan speed control circuit can be set so that the driving output voltage of the target fan can be greater than or equal to the value when the starting voltage of the fan speed control circuit is the first starting threshold, and the starting voltage of the fan speed control circuit is the second starting threshold and is greater than the starting voltage of the target fan, so as to avoid the problem of the fan being unable to start for a long time in extreme cases.

[0125] It can be seen from the technical solution introduced above that the method provided in the embodiment of the present application can set the minimum starting voltage of the target fan through the fan speed control circuit to ensure the normal low-voltage start-up of the fan, effectively avoid the fan being at the critical starting point when powered by linear low voltage, effectively control the temperature of the fan, increase the service life of the fan, reduce the cost of the product, and improve the working efficiency of the fan.

[0126] As can be seen from the above description, the method provided in the embodiment of the present application can set the maximum supply voltage of the target wind turbine. The following describes the process, which may include the following:

[0127] In actual application, when the output voltage of the chip with adjustable output voltage is too large, the fan may be damaged and the cost of the circuit will also increase. Therefore, in order to prevent the fan temperature from being too high and reduce the circuit cost, Figure 2 As shown, the fan speed control circuit provided in the embodiment of the present application may include multiple components such as a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a twelfth resistor R12, a thirteenth resistor R13, a second transistor Q2 and a fourth transistor Q4.

[0128] The maximum power supply voltage of the wind turbine can be limited by using multiple components such as the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the twelfth resistor R12, the thirteenth resistor R13, the second transistor Q2 and the fourth transistor Q4.

[0129] Specifically, if Figure 2 In the fan speed control circuit shown, when the target fan drive output voltage reaches the maximum supply voltage of the target fan, the divided voltage of the sixth resistor R6 and the seventh resistor R7 in the fan speed control circuit reaches the conduction threshold of the second transistor Q2, causing the second transistor Q2 and the fourth transistor Q4 to operate in the conduction state. At this time, incorporating R8 into the fan speed control circuit can reduce the impedance across R1 of the fan speed control circuit, thereby reducing the target fan drive output voltage, thereby causing the second transistor Q2 and the fourth transistor Q4 of the fan speed control circuit to operate in the cut-off state;

[0130] When the second transistor Q2 and the fourth transistor Q4 of the fan speed control circuit are in the off state, the original impedance of the first resistor R1 of the fan speed control circuit can be restored, so that the output voltage of the target fan drive reaches the maximum output voltage again. This embodiment of the present application can limit the maximum output voltage of the fan through such a repeated error comparison process to prevent damage to the fan caused by excessive output voltage due to excessive ambient temperature.

[0131] In actual application, in some extreme cases, the fan may not stop completely and remain in the critical range for a long time. In order to solve this problem, when the ambient temperature of the target fan drops, the impedance of the first resistor R1 of the fan speed control circuit will increase. At this time, the embodiment of the present application can further determine whether the drive output voltage of the target fan is lower than the second starting threshold of the starting voltage of the fan speed control circuit; if the drive output voltage of the target fan is lower than the second starting threshold of the starting voltage of the fan speed control circuit, the operation of the first transistor Q1 of the fan speed control circuit can be cut off; when the first transistor Q1 of the fan speed control circuit is When the first transistor Q1 starts to cut off, causing the third transistor Q3 of the fan speed control circuit to be cut off, the bias of the ninth resistor R9 of the fan speed control circuit on the base of the first transistor Q1 of the fan speed control circuit can be disconnected; and the first transistor Q1 of the fan speed control circuit is accelerated to be completely cut off, and the starting threshold of the fan speed control circuit is changed from the second starting threshold value to the first starting threshold value; when the first starting threshold value of the starting voltage of the fan speed control circuit is greater than the second starting threshold value and greater than the starting voltage of the target fan, the target fan is immediately turned off to avoid the problem of incomplete fan shutdown and long-term critical range in extreme cases.

[0132] It can be seen from the technical solution introduced above that the method provided in the embodiment of the present application can effectively avoid the problem of incomplete fan shutdown and long-term critical range in extreme situations by setting the parameters of each component of the fan speed control circuit, thereby increasing the service life of the fan and reducing the failure rate of the fan.

[0133] The fan speed control circuit provided in the embodiment of the present application can be applied to fan speed control equipment, such as terminals: mobile phones, computers, etc. Optionally, Figure 4 The hardware structure diagram of the fan speed control device is shown. Figure 4 The hardware structure of the wind turbine speed control device may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4.

[0134] In an embodiment of the present application, the number of processor 1 , communication interface 2 , memory 3 , and communication bus 4 is at least one, and the processor 1 , communication interface 2 , and memory 3 communicate with each other through the communication bus 4 .

[0135] The processor 1 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application;

[0136] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory;

[0137] The memory stores a program, and the processor can call the program stored in the memory, wherein the program is used to implement various processing flows in the aforementioned terminal fan speed control solution.

[0138] An embodiment of the present application further provides a readable storage medium, which may store a program suitable for execution by a processor, wherein the program is used to implement various processing flows of the aforementioned terminal in the wind turbine speed control solution.

[0139] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0140] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0141] The above description of the disclosed embodiments is intended to enable those skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. The various embodiments may be combined with one another. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fan speed control method, characterized in that: include: The preset fan speed control circuit is used to set a low voltage that stops the target fan; Using the thermistor of the fan speed control circuit to linearly control the speed of the target fan; Setting the minimum starting voltage and maximum supply voltage of the target wind turbine; The setting of the minimum starting voltage of the target wind turbine includes: Determining the sum of the fourth resistor and the fifth resistor of the fan speed control circuit; determining a first ratio of a sum of a fourth resistor and a fifth resistor of the fan speed control circuit to the fifth resistor; Setting the starting voltage threshold of the fan speed control circuit to the product of the transistor junction voltage of the fan speed control circuit and the first ratio; Setting the starting voltage of the target fan to be less than the first starting voltage threshold of the fan speed control circuit, and making the driving output voltage of the target fan greater than the first starting voltage threshold of the fan speed control circuit; The fan speed control circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first transistor, a second transistor, a third transistor, a fourth transistor, a first diode, a step-down chip, and a target wind turbine; in, The second resistor is a thermistor; The fourth resistor, the fifth resistor, the fifth capacitor and the first transistor constitute the minimum starting voltage of the target wind turbine; When the output voltage of the fan speed control circuit reaches the maximum power supply voltage of the target fan, the divided voltage of the sixth resistor and the seventh resistor reaches the conduction threshold of the second transistor, so that the second transistor and the fourth transistor operate in the on state, and the eighth resistor is incorporated into the first resistor to reduce the impedance across the first resistor, thereby reducing the output voltage of the fan speed control circuit. At this moment, the second transistor and the fourth transistor operate in the cut-off state; the first resistor restores its original impedance, so that the fan speed control circuit reaches the maximum output voltage again.

2. The method according to claim 1, characterized in that The low voltage that causes the target fan to stop rotating is set by the preset fan speed control circuit, including: The low voltage that stops the target fan is set by the chip with adjustable output voltage of the fan speed control circuit.

3. The method according to claim 1, characterized in that The method of linearly controlling the speed of the target fan by using the thermistor of the fan speed control circuit includes: The output voltage of the target fan speed control circuit is set according to the thermistor of the fan speed control circuit and the ambient temperature of the target fan. in, When the ambient temperature of the target fan is higher, the impedance of the thermistor is smaller, and the output voltage of the fan speed control circuit is increased.

4. The method according to claim 1, wherein The setting of the maximum supply voltage of the target wind turbine includes: When the target fan drive output voltage reaches the maximum supply voltage of the target fan, the divided voltage of the sixth resistor and the seventh resistor in the fan speed control circuit reaches the conduction threshold of the second transistor, so that the second transistor and the fourth transistor work in the conduction state, and the eighth resistor is incorporated into the fan speed control circuit to reduce the impedance across the first resistor of the fan speed control circuit; reducing the output voltage of the target fan drive so that the second transistor and the fourth transistor of the fan speed control circuit operate in a cut-off state; The original impedance of the first resistor of the fan speed control circuit is restored so that the output voltage of the target fan drive reaches the maximum output voltage again.

5. The method according to claim 1, wherein Also includes: When the divided voltage of the fourth resistor and the fifth resistor of the fan speed control circuit is infinitely close to the transistor junction voltage of the fan speed control circuit, the ninth resistor, the tenth resistor, the eleventh resistor and the third transistor are connected to the fan speed control circuit; When the low voltage of the target wind turbine starts the first transistor of the wind turbine speed control circuit to start slightly conducting, the third transistor of the wind turbine speed control circuit is triggered to conduct, so that the bias of the ninth resistor of the wind turbine speed control circuit is connected to the base of the first transistor; Accelerating the complete conduction of the first transistor of the fan speed control circuit to reduce the first starting threshold of the fan speed control circuit to a second starting threshold, wherein the first starting threshold is greater than the second starting threshold; The ninth resistor is set so that the drive output voltage of the target fan is greater than or equal to the first starting threshold of the fan speed control circuit, and the second starting threshold is greater than the starting voltage of the target fan.

6. The method according to claim 5, characterized in that Also includes: When the ambient temperature of the target fan decreases and the resistance impedance of the second resistor of the fan speed control circuit increases, determining whether the drive output voltage of the target fan is lower than the second starting threshold of the fan speed control circuit; If the drive output voltage of the target fan is lower than the second starting threshold of the fan speed control circuit, the first transistor of the fan speed control circuit begins to be cut off; When the first transistor of the fan speed control circuit starts to be cut off, causing the third transistor of the fan speed control circuit to be cut off, disconnecting the bias of the ninth resistor of the fan speed control circuit on the base of the first transistor of the fan speed control circuit; Accelerating the complete cutoff of the first transistor of the fan speed control circuit, and changing the starting threshold of the fan speed control circuit from the second starting threshold to the first starting threshold; When the first starting threshold of the fan speed control circuit is greater than the second starting threshold and greater than the starting voltage of the target fan, the target fan is immediately turned off.

7. A fan speed control device, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, which, when executed by the one or more processors, implement the steps of the fan speed control method according to any one of claims 1 to 6.

8. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors implement the steps of the wind turbine speed control method according to any one of claims 1 to 6.

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