Fan speed regulating device

Abstract

The utility model discloses a fan speed regulation device. The fan speed regulation device comprises a speed regulation control module and a multi-channel fan driving detection module, the multi-channel fan driving detection module comprises a plurality of single-channel fan driving detection units, and each single-channel fan driving detection unit is connected to one fan; each single-channel fan driving detection unit comprises a driving subunit, a speed regulation subunit and a detection subunit; the first end of the driving subunit is connected to the speed regulation control module, and the second end of the driving subunit is connected to the fan; the first end of the speed regulation subunit is connected to the speed regulation control module, the second end of the speed regulation subunit is connected to the third end of the driving subunit, and the third end of the speed regulation subunit is connected to the fan; the first end of the detection subunit is connected to the speed regulation control module, and the second end of the detection subunit is connected to the fan. The device can reduce port resources needed by fan driving speed regulation, and the cost is reduced. The utility model relates to the technical field of fan control.

Description

Technical Field

[0001] The utility model relates to the technical field of fan control, in particular to a fan speed regulating device. Background Art

[0002] With the increasing number of outdoor performances, the demand for outdoor waterproof lamps is also increasing. Among them, it is particularly important to dissipate heat from the light sources of lamps (such as halogen bulbs and LED modules) through cooling fans.

[0003] At present, the existing technology generally integrates the fan circuit, stepper motor drive circuit and LED control circuit into the lamp driver board, and realizes the fan drive and speed control by sharing the port resources of the lamp MCU. The number of ports required to realize the fan drive and speed control in this way is often large, which requires the use of a lamp MCU with a large number of ports during the lamp function design process, which is costly.

[0004] Therefore, the problems existing in the existing technology still need to be solved and optimized. Utility Model Content

[0005] The purpose of this utility model is to solve the technical problems existing in the related technologies to a certain extent.

[0006] To this end, an object of an embodiment of the present utility model is to provide a fan speed regulation device, which can reduce the lamp MCU port resources required for fan drive speed regulation and reduce costs.

[0007] In order to achieve the above technical objectives, the embodiment of the present utility model provides a fan speed control device, including a speed control module and a multi-channel fan drive detection module;

[0008] The multi-channel fan drive detection module includes a plurality of single-channel fan drive detection units, each of which is connected to a fan;

[0009] Each of the single-channel fan drive detection units includes a drive subunit, a speed regulation subunit and a detection subunit;

[0010] The first end of the driving subunit is connected to the speed control module, and the second end of the driving subunit is connected to the fan;

[0011] The first end of the speed regulating subunit is connected to the speed regulating control module, the second end of the speed regulating subunit is connected to the third end of the driving subunit, and the third end of the speed regulating subunit is connected to the fan;

[0012] A first end of the detection subunit is connected to the speed control module, and a second end of the detection subunit is connected to the fan.

[0013] In addition, a fan speed regulating device according to an embodiment of the present invention may also have the following additional technical features:

[0014] Optionally, in one embodiment of the present invention, the speed control module includes an STM32F103 chip, and the twentieth pin of the STM32F103 chip is connected to the driving subunit.

[0015] Optionally, in one embodiment of the present invention, the driving sub-unit includes a TPS5430 chip, and a fifth pin of the TPS5430 chip is connected to the speed control module.

[0016] Optionally, in one embodiment of the present utility model, the detection subunit includes a first resistor, a second resistor and a first capacitor;

[0017] A first end of the first resistor is connected to the fan, and a second end of the first resistor is connected to the speed control module;

[0018] A first end of the first capacitor is connected to a first end of the first resistor, and a second end of the first capacitor is grounded;

[0019] A first end of the second resistor is connected to a first end of the first capacitor, and a second end of the second resistor is externally connected to an external power supply.

[0020] Optionally, in one embodiment of the present utility model, the speed regulation subunit includes a voltage speed regulation circuit, a switching circuit and a duty cycle speed regulation circuit;

[0021] The first end of the voltage speed regulating circuit is connected to the third end of the driving subunit, and the second end of the voltage speed regulating circuit is connected to the second end of the switching circuit;

[0022] The first end of the switching circuit is connected to the speed control module, the speed control module is connected to the first end of the duty cycle speed control circuit, and the second end of the duty cycle speed control circuit is connected to the fan.

[0023] Optionally, in one embodiment of the present utility model, the voltage speed regulation circuit includes a third resistor, a fourth resistor, a first inductor, a second capacitor and a first diode;

[0024] The first end of the second capacitor is connected to the third end of the driving subunit, the first end of the second capacitor is connected to the first end of the third resistor, and the second end of the second capacitor is grounded;

[0025] The first end of the third resistor is connected to the first end of the fourth resistor, the first end of the third resistor is connected to the second end of the switching circuit, and the second end of the fourth resistor is connected to the second end of the second capacitor;

[0026] The second end of the third resistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the cathode of the first diode, and the anode of the first diode is connected to the second end of the second capacitor.

[0027] Optionally, in one embodiment of the present utility model, the switching circuit includes a second diode, a first gate tube, a fifth resistor and a switching switch;

[0028] The drain of the first gate tube is connected to the second end of the voltage speed control circuit, the drain of the first gate tube is connected to the cathode of the second diode, the source of the first gate tube is connected to the anode of the second diode, and the source of the first gate tube is grounded;

[0029] The gate of the first gate tube is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the source of the first gate tube;

[0030] The gate of the first gate tube is connected to the first end of the switch, and the second end of the switch is connected to the speed control module.

[0031] Optionally, in one embodiment of the present utility model, the duty cycle speed regulation circuit includes a sixth resistor, a seventh resistor and a first transistor;

[0032] A first end of the sixth resistor is connected to the speed control module, and a second end of the sixth resistor is connected to the base of the first transistor;

[0033] The emitter of the first transistor is grounded, the collector of the first transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to an external power supply.

[0034] Optionally, in one embodiment of the present invention, the fan speed regulation device further includes a communication module, the communication module includes an SN75176 chip, and the first pin and the fourth pin of the SN75176 chip are connected to the speed control module.

[0035] Optionally, in one embodiment of the present invention, the fan speed regulation device further includes a gravity sensing module, the gravity sensing module includes a LIS3DH chip, and the sixth pin and the seventh pin of the LIS3DH chip are connected to the speed control module.

[0036] The advantages and benefits of the present invention will be described in part in the following description, and will become apparent from the following description or learned through practice of the present invention:

[0037] The embodiment of the present application discloses a fan speed control device, which includes a speed control module and a multi-channel fan drive detection module; the multi-channel fan drive detection module includes several single-channel fan drive detection units, each of which is connected to a fan; each single-channel fan drive detection unit includes a driver subunit, a speed control subunit, and a detection subunit; the first end of the driver subunit is connected to the speed control module, and the second end of the driver subunit is connected to the fan; the first end of the speed control subunit is connected to the speed control module, the second end of the speed control subunit is connected to the third end of the driver subunit, and the third end of the speed control subunit is connected to the fan; the first end of the detection subunit is connected to the speed control module, and the second end of the detection subunit is connected to the fan. The fan speed control device can be extended to connect to the lamp MCU, and it realizes the drive and speed control of multiple fans through the speed control module and the multi-channel fan drive detection module, which can effectively reduce the lamp MCU port resources required for the lamp to realize the drive and speed control of the fan, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0039] Figure 1 A schematic diagram of a fan speed regulating device according to an embodiment of the present invention;

[0040] Figure 2 A circuit diagram of a speed control module provided in one embodiment of the present utility model;

[0041] Figure 3 A circuit schematic diagram of a single-channel fan drive detection unit provided in one embodiment of the present utility model;

[0042] Figure 4 A circuit schematic diagram of a speed regulating subunit provided in one embodiment of the present utility model;

[0043] Figure 5 A circuit schematic diagram of a communication module provided in one embodiment of the present utility model;

[0044] Figure 6 A circuit schematic diagram of a gravity sensing module provided in one embodiment of the present utility model. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "length", "up", "down", "front", "back", "left", "right", "top", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] Currently, existing technologies generally integrate the fan circuit, stepper motor drive circuit, and LED control circuit into a lamp driver board, achieving fan drive and speed control by sharing the port resources of the lamp MCU. However, since the more lamp MCU ports required, the higher the price of the lamp MCU, achieving fan drive and speed control using this method often requires a large number of ports, resulting in the need to use a lamp MCU with a large number of ports during the lamp function design process, which is costly. In addition, since the number of ports required for this method of sharing lamp MCU port resources is often large, in actual applications, when the lamp fan heat dissipation needs to be improved after mass production, the number of lamp MCU ports and fan drive circuits is often insufficient. It is often impossible to meet the new heat dissipation requirements by improving the original lamp circuit design, and the lamp circuit needs to be redesigned, resulting in poor flexibility and compatibility of the lamp circuit.

[0048] In view of this, the present invention provides a fan speed control device in an embodiment. This fan speed control device realizes the drive and speed control of multiple fans through a speed control module and a multi-channel fan drive detection module. This can effectively reduce the lamp MCU port resources required to realize fan drive and speed control in the lamp, thereby reducing costs. In addition, because the fan speed control device can be extended to connect to the lamp MCU, if the lamp fan heat dissipation needs to be improved after mass production, this can be achieved by directly adjusting the number of fan speed control devices and fans connected to the lamp MCU, making the lamp circuit more flexible and compatible.

[0049] Reference Figure 1 ,Specifically, a fan device in an embodiment of the present application includes a speed control module and a multi-channel fan drive detection module;

[0050] The multi-channel fan drive detection module includes a plurality of single-channel fan drive detection units, each of which is connected to a fan;

[0051] Each of the single-channel fan drive detection units includes a drive subunit, a speed regulation subunit and a detection subunit;

[0052] The first end of the driving subunit is connected to the speed control module, and the second end of the driving subunit is connected to the fan;

[0053] The first end of the speed regulating subunit is connected to the speed regulating control module, the second end of the speed regulating subunit is connected to the third end of the driving subunit, and the third end of the speed regulating subunit is connected to the fan;

[0054] A first end of the detection subunit is connected to the speed control module, and a second end of the detection subunit is connected to the fan.

[0055] In an embodiment of the present application, the speed control module is used to drive and speed-control several designated fans through a multi-channel fan drive detection module; the multi-channel fan drive detection module is used to drive one or more connected fans, wherein the drive subunit in the single-channel fan drive detection unit is used to drive a corresponding fan, the speed control subunit is used to control the speed of the driven fan, and the detection subunit is used to detect the actual speed value of the driven fan.

[0056] For example, the working principle of a fan speed regulating device provided in an embodiment of the present application is as follows:

[0057] For a specified fan, the speed control module can be driven and speed-controlled by a single-channel fan drive detection unit corresponding to the specified fan. Specifically, it can send an enable signal to the drive sub-unit so that the drive sub-unit drives the fan to work; and the speed control module sends a duty cycle signal to the speed control sub-unit, and adjusts the drive voltage provided by the drive sub-unit or the duty cycle of the fan's PWM pin through the speed control sub-unit, thereby realizing the adjustment and control of the fan speed; in addition, the speed control module receives the speed signal from the fan, and drives and controls the fan according to the speed signal of the fan. There are many ways to drive and control the fan according to the speed signal of the fan, which will not be repeated in this application.

[0058] It should be noted that the fan speed control device does not involve any software improvements, and the software content can be simply derived based on the existing technology. In addition, the multi-channel fan drive detection module in the embodiment of the present application can be set in a modular circuit board with the speed control module. The number of single-channel fan drive detection units in the specific multi-channel fan drive detection module can be any one of 2, 4, 6, 8, 9, 12, etc. The example of this application is only for illustration. The number of single-channel fan drive detection units in the multi-channel fan drive detection module can be set according to actual conditions. For example, in actual applications, a modular circuit board consisting of 4 single-channel fan drive detection units and a speed control module is suitable for fan heat dissipation in a small space, such as a lamp air guide trough or a switching power supply used in a lamp; a modular circuit board consisting of 8 single-channel fan drive detection units and a speed control module is suitable for heat exchange between the inner and outer cavities of a lamp sealed radiator, such as commonly used in high-power waterproof pattern lights or waterproof beam lights; and a modular circuit board consisting of 12 single-channel fan drive detection units and a speed control module is suitable for waterproof effect lights with multiple small lamp heads.

[0059] It is worth mentioning that in actual applications, the fan can be a three-wire fan or a four-wire fan, wherein the speed of the three-wire fan is achieved by controlling the driving voltage provided by the driver sub-unit, while the speed of the four-wire fan is achieved by controlling the duty cycle of its PWM pin. Specifically, if the fan is a three-wire fan, the speed control module can send a duty cycle signal to the speed control sub-unit, and the speed control sub-unit transmits the duty cycle signal to the driver sub-unit to adjust the driving voltage provided by the driver sub-unit, thereby achieving the drive and speed control of the three-wire fan; or, if the fan is a four-wire fan, the speed control module can directly send a duty cycle signal to the PWM pin of the four-wire fan through the speed control sub-unit, and achieve speed control of the four-wire fan through the duty cycle signal.

[0060] Reference Figure 2In some embodiments, the speed control module includes an STM32F103 chip, and the twentieth pin of the STM32F103 chip is connected to the driving subunit.

[0061] In an embodiment of the present application, the speed control module can be an STM32F103 chip, which can connect a four-bit dip switch SW1 at the fifth pin to the eighth pin of the STM32F103 chip. The four-bit dip switch can set 16 different address codes, and different address codes can be used to instruct the speed control module to control several different single-channel fan drive detection units.

[0062] It can be understood that the 20th pin of the STM32F103 chip in the embodiment of the present application is connected to the driving sub-unit corresponding to a certain fan, and the STM32F103 chip provides an enable signal to the driving sub-unit through the 20th pin, so that the driving sub-unit works and provides a driving voltage to the corresponding fan, thereby putting the corresponding fan into working state.

[0063] Reference Figure 3 In some embodiments, the driving sub-unit 100 includes a TPS5430 chip, and the fifth pin of the TPS5430 chip is connected to the speed control module.

[0064] In an embodiment of the present application, the driving sub-unit can be a TPS5430 chip. After receiving the enable signal sent by the speed control module through the fifth pin of the TPS5430 chip, the TPS5430 chip works and provides a driving voltage to the fan through the eighth pin, so that the corresponding fan is in a working state.

[0065] Reference Figure 3 , in some embodiments, the detection subunit 300 includes a first resistor R7, a second resistor R3 and a first capacitor C9;

[0066] A first end of the first resistor is connected to the fan, and a second end of the first resistor is connected to the speed control module;

[0067] A first end of the first capacitor is connected to a first end of the first resistor, and a second end of the first capacitor is grounded;

[0068] A first end of the second resistor is connected to a first end of the first capacitor, and a second end of the second resistor is externally connected to an external power supply.

[0069] In an embodiment of the present application, if the fan is a three-wire fan, the first pin to the third pin in FAN1 are respectively the three fan ports of the three-wire fan. At this time, since the three-wire fan has three fan ports, the fourth pin in FAN1 is not any fan port of the three-wire fan; or, if the fan is a four-wire fan, the first pin to the fourth pin in FAN1 are respectively the four fan ports of the four-wire fan.

[0070] It can be understood that for a certain fan, when the driving sub-unit provides the driving voltage to the fan, the fan is in working state. After the fan rotates, the SPD fan port of the fan (such as a three-wire fan or a four-wire fan) will generate a square wave speed signal. The speed control module can receive the square wave speed signal through the first resistor R7, and reduce the noise interference of the square wave speed signal during the circuit transmission process through the second resistor R3 and the second capacitor C9. The actual speed value of the fan can be obtained by calculating the pulses of the square wave speed signal. The actual speed value can be the number of revolutions of the fan in each group. There are many specific calculation methods, which will not be repeated in this application.

[0071] Reference Figure 3 , in some embodiments, the speed regulation subunit 200 includes a voltage speed regulation circuit, a switching circuit and a duty cycle speed regulation circuit;

[0072] The first end of the voltage speed regulating circuit is connected to the third end of the driving subunit, and the second end of the voltage speed regulating circuit is connected to the second end of the switching circuit;

[0073] The first end of the switching circuit is connected to the speed control module, the speed control module is connected to the first end of the duty cycle speed control circuit, and the second end of the duty cycle speed control circuit is connected to the fan.

[0074] In an embodiment of the present application, the switching circuit is used to control the on-off state of the circuit from the speed control module to the drive sub-unit. Specifically, if the fan is a three-wire fan, the on-off state of the circuit from the speed control module to the drive sub-unit is a connected state, and the speed control module can transmit the duty cycle signal to the drive sub-unit through the switching circuit; or, if the fan is a four-wire fan, the on-off state of the circuit from the speed control module to the drive sub-unit is an open state. At this time, the speed control module can directly send the duty cycle signal to the four-wire fan through the duty cycle speed control circuit to realize speed control of the four-wire fan.

[0075] Reference Figure 4 In some embodiments, the voltage speed control circuit 210 includes a third resistor R1, a fourth resistor R2, a first inductor L1, a second capacitor C86 and a first diode D1;

[0076] The first end of the second capacitor is connected to the third end of the driving subunit, the first end of the second capacitor is connected to the first end of the third resistor, and the second end of the second capacitor is grounded;

[0077] The first end of the third resistor is connected to the first end of the fourth resistor, the first end of the third resistor is connected to the second end of the switching circuit, and the second end of the fourth resistor is connected to the second end of the second capacitor;

[0078] The second end of the third resistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the cathode of the first diode, and the anode of the first diode is connected to the second end of the second capacitor.

[0079] In an embodiment of the present application, if the fan corresponding to the voltage speed regulation circuit is a three-wire fan, the duty cycle signal sent by the speed regulation control module can be transmitted to the driving sub-unit through the switching circuit and the voltage speed regulation circuit, so that the driving sub-unit adjusts the output driving voltage based on the received duty cycle signal, thereby realizing the speed control of the three-wire fan.

[0080] It can be understood that if the fan corresponding to the voltage speed control circuit is a four-wire fan, the circuit on-off state from the speed control module to the drive sub-unit is in an open circuit state. At this time, the driving voltage provided by the drive sub-unit can be adjusted by adjusting the third resistor and the fourth resistor. At the same time, the speed control module sends the duty cycle signal to the four-wire fan through the duty cycle speed control circuit to realize the speed control of the four-wire fan.

[0081] Reference Figure 4 In some embodiments, the switching circuit 220 includes a second diode D2, a first gate transistor Q19, a fifth resistor R132 and a switch;

[0082] The drain of the first gate tube is connected to the second end of the voltage speed control circuit, the drain of the first gate tube is connected to the cathode of the second diode, the source of the first gate tube is connected to the anode of the second diode, and the source of the first gate tube is grounded;

[0083] The gate of the first gate tube is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the source of the first gate tube;

[0084] The gate of the first gate tube is connected to the first end of the switch, and the second end of the switch is connected to the speed control module.

[0085] In the embodiment of the present application, if the fan corresponding to the switching circuit is a three-wire fan, the circuit on-off state from the speed control module to the drive sub-unit is in the on state, that is, the switch is in the closed state. Figure 3middle, Figure 3 The resistor R131 in the switching circuit is used to represent the switching switch when the fan corresponding to the switching circuit is a three-wire fan.

[0086] It can be understood that if the fan corresponding to the switching circuit is a four-wire fan, the circuit on-off state from the speed control module to the drive sub-unit is in the open state, that is, the switch is in the open state. In actual application, at this time Figure 3 Resistor R131 in the circuit breaker can be left unsoldered, with the unsoldered resistor R131 representing the switch in the open state. Furthermore, when resistor R131 is unsoldered (i.e., the switch is in the open state), the first gate transistor Q19 cannot conduct due to the pull-down effect of the fifth resistor R132. In this case, the third and fourth resistors can be used to adjust the drive voltage provided to the four-wire fan by the driver subunit.

[0087] Reference Figure 4 In some embodiments, the duty cycle speed control circuit 230 includes a sixth resistor R92, a seventh resistor R91 and a first transistor Q1;

[0088] A first end of the sixth resistor is connected to the speed control module, and a second end of the sixth resistor is connected to the base of the first transistor;

[0089] The emitter of the first transistor is grounded, the collector of the first transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to an external power supply.

[0090] In an embodiment of the present application, if the fan corresponding to the duty cycle speed regulation circuit is a three-wire fan, since the fourth pin in FAN1 is not any fan port of the three-wire fan and the transmitter of the first transistor is grounded, the three-wire fan does not operate at this time; or, if the fan corresponding to the duty cycle speed regulation circuit is a four-wire fan, the speed regulation control module can adjust the duty cycle of the PWM pin of the four-wire fan by adjusting the high level duration in the sent duty cycle signal, thereby realizing the speed control of the four-wire fan.

[0091] Reference Figure 5 In some embodiments, the fan speed control device further includes a communication module, the communication module includes an SN75176 chip, and the first pin and the fourth pin of the SN75176 chip are connected to the speed control module.

[0092] In an embodiment of the present application, the communication module is used to realize the communication connection between the speed control module and the lamp MCU. It can communicate with the lamp MCU through the SN75176 chip based on the RS485 communication protocol. Specifically, the communication data is transmitted to the speed control module through the first pin and the fourth pin of the SN75176 chip, so that the speed control module can drive and control the speed of the corresponding fan based on the received communication data.

[0093] Reference Figure 6 In some embodiments, the fan speed control device further includes a gravity sensing module, the gravity sensing module includes a LIS3DH chip, and the sixth pin and the seventh pin of the LIS3DH chip are connected to the speed control module.

[0094] In an embodiment of the present application, the gravity sensing module is used to detect the lamp body position of the lamp in the horizontal and vertical directions, which can be achieved through the LIS3DH chip and its associated circuits. After the LIS3DH chip detects the lamp body position of the corresponding lamp in the horizontal and vertical directions, the lamp body position data can be sent to the speed control module through the sixth and seventh pins of the LIS3DH chip, so that the speed control module adjusts the corresponding fan voltage or fan speed based on the lamp body position data.

[0095] Throughout this specification, references to terms such as "one embodiment," "another embodiment," or "certain embodiments" indicate that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fan speed regulating device, characterized in that: Including speed control module and multi-channel fan drive detection module; The multi-channel fan drive detection module includes a plurality of single-channel fan drive detection units, each of which is connected to a fan; Each of the single-channel fan drive detection units includes a drive subunit, a speed regulation subunit and a detection subunit; The first end of the driving subunit is connected to the speed control module, and the second end of the driving subunit is connected to the fan; The first end of the speed regulating subunit is connected to the speed regulating control module, the second end of the speed regulating subunit is connected to the third end of the driving subunit, and the third end of the speed regulating subunit is connected to the fan; A first end of the detection subunit is connected to the speed control module, and a second end of the detection subunit is connected to the fan.

2. The fan speed regulating device according to claim 1, characterized in that: The speed control module includes an STM32F103 chip, and the 20th pin of the STM32F103 chip is connected to the driving subunit.

3. The fan speed regulating device according to claim 1, characterized in that: The driving subunit includes a TPS5430 chip, and a fifth pin of the TPS5430 chip is connected to the speed control module.

4. The fan speed regulating device according to claim 1, characterized in that: The detection subunit includes a first resistor, a second resistor and a first capacitor; A first end of the first resistor is connected to the fan, and a second end of the first resistor is connected to the speed control module; A first end of the first capacitor is connected to a first end of the first resistor, and a second end of the first capacitor is grounded; A first end of the second resistor is connected to a first end of the first capacitor, and a second end of the second resistor is externally connected to an external power supply.

5. The fan speed regulating device according to claim 1, characterized in that: The speed regulation subunit includes a voltage speed regulation circuit, a switching circuit and a duty cycle speed regulation circuit; The first end of the voltage speed regulating circuit is connected to the third end of the driving subunit, and the second end of the voltage speed regulating circuit is connected to the second end of the switching circuit; The first end of the switching circuit is connected to the speed control module, the speed control module is connected to the first end of the duty cycle speed control circuit, and the second end of the duty cycle speed control circuit is connected to the fan.

6. The fan speed regulating device according to claim 5, characterized in that: The voltage speed regulation circuit includes a third resistor, a fourth resistor, a first inductor, a second capacitor and a first diode; The first end of the second capacitor is connected to the third end of the driving subunit, the first end of the second capacitor is connected to the first end of the third resistor, and the second end of the second capacitor is grounded; The first end of the third resistor is connected to the first end of the fourth resistor, the first end of the third resistor is connected to the second end of the switching circuit, and the second end of the fourth resistor is connected to the second end of the second capacitor; The second end of the third resistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the cathode of the first diode, and the anode of the first diode is connected to the second end of the second capacitor.

7. The fan speed regulating device according to claim 5, characterized in that: The switching circuit includes a second diode, a first gate tube, a fifth resistor and a switching switch; The drain of the first gate tube is connected to the second end of the voltage speed control circuit, the drain of the first gate tube is connected to the cathode of the second diode, the source of the first gate tube is connected to the anode of the second diode, and the source of the first gate tube is grounded; The gate of the first gate tube is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the source of the first gate tube; The gate of the first gate tube is connected to the first end of the switch, and the second end of the switch is connected to the speed control module.

8. The fan speed regulating device according to claim 5, characterized in that: The duty cycle speed regulation circuit includes a sixth resistor, a seventh resistor and a first transistor; A first end of the sixth resistor is connected to the speed control module, and a second end of the sixth resistor is connected to the base of the first transistor; The emitter of the first transistor is grounded, the collector of the first transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to an external power supply.

9. The fan speed regulating device according to claim 1, characterized in that: The fan speed regulation device further includes a communication module, which includes an SN75176 chip, and a first pin and a fourth pin of the SN75176 chip are connected to the speed regulation control module.

10. The fan speed regulating device according to claim 7, characterized in that: The fan speed regulating device further includes a gravity sensing module, which includes a LIS3DH chip. The sixth pin and the seventh pin of the LIS3DH chip are connected to the speed regulating control module.

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