Multi-channel control fan cooling system

Abstract

The invention relates to a multi-channel control fan heat dissipation system which comprises a first fan, a second fan, a circular electric connector and a connector tail attachment, fan outgoing lines are connected to the first fan and the second fan and are connected with the circular electric connector in a welded mode, and the connector tail attachment is connected with the circular electric connector in a welded mode. The connector tail attachment is fixed between a fan outgoing line and the circular electric connector, a fan integrated control module is arranged on the circular electric connector, the fan integrated control module is provided with a test circuit, the test circuit outputs a fan PWM speed measurement signal, 28V pull-up voltage is built in the fan PWM speed measurement signal, a speed regulation port is arranged on the fan integrated control module, and the fan integrated control module is connected with the fan outgoing line. And the speed regulation port outputs 28V fan PWM speed regulation signal voltage, and the 28V fan PWM speed regulation signal voltage is converted into 3.3 V in the fan integrated control module for use. In a word, the fan integrated control module has the advantages of being easy to mount and dismount, and convenient for integrated control and high-voltage control.

Description

Technical Field

[0001] The invention belongs to the technical field of fan heat dissipation, and in particular relates to a multi-channel controlled fan heat dissipation system. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine and is widely used in ventilation, dust removal, cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and air intake in boilers and industrial furnaces, cooling and ventilation in air conditioning equipment and household appliances. The application scenarios of fans vary depending on the installation environment of the equipment. There are some uses that require quick installation, integrated control, and high-voltage control, which puts strict requirements on the electrical interface and control circuit of the fan.

[0003] However, these fans have many problems during use and are difficult to meet the requirements, especially the heat dissipation system, which is directly related to the application of the fan. The existing fan heat dissipation system has the following disadvantages: first, it is very inconvenient to install, the corresponding lines are not protected, and the safety performance is not high; second, the control method of the fan is too single and cannot be comprehensively controlled in an integrated manner; finally, the fan heat dissipation system needs to be powered by a different voltage from the operating system, and additional transformer equipment needs to be added, which is very inconvenient to use. Therefore, a multi-channel control fan heat dissipation system is urgently needed to solve the above problems. Summary of the invention

[0004] In view of this, the present invention proposes a multi-channel control fan cooling system, which is applied to the field of fan cooling technology to solve the existing technical problems of inconvenient installation and disassembly, inability to perform integrated control, unsuitability for high voltage power supply and small voltage speed regulation range.

[0005] In order to achieve the above technical objectives, the specific technical solutions adopted by the present invention are:

[0006] A multi-channel controlled fan heat dissipation system comprises a first fan, a second fan, a circular electrical connector and a connector tail. The first fan and the second fan are both connected with fan lead wires, the fan lead wires are connected to the circular electrical connector by welding, and the internal circuits are kept connected. The connector tail is fixed between the fan lead wires and the circular electrical connector, so that the fan lead wires are reinforced and protected by using the connector tail. The circular electrical connector is provided with a fan integrated control module, the fan integrated control module is provided with a test circuit, the test circuit outputs a fan PWM speed measurement signal, the fan PWM speed measurement signal has a built-in 28V pull-up voltage, and the fan integrated control module is provided with a speed regulation port, the speed regulation port outputs a 28V fan PWM speed regulation signal voltage, and the 28V fan PWM speed regulation signal voltage is converted into 3.3V for use inside the fan integrated control module.

[0007] Furthermore, the fan integrated control module is provided with a two-stage transistor and a single-chip microcomputer. After receiving the fan PWM speed control signal processed by the two-stage transistor, the single-chip microcomputer converts the 28V high level of the fan PWM speed control signal into 3.3V and inputs it into the single-chip microcomputer.

[0008] Furthermore, after the single chip microcomputer recognizes the speed regulation signal, it regulates the speed of the fan high voltage by controlling the PWM signal cycle of the driving circuit.

[0009] Furthermore, the voltage of the power supply circuit is 3.3V, and a Schottky diode D2 is provided between the speed regulation port and the power supply circuit.

[0010] Furthermore, the power supply is improved for the fan PWM speed regulation signal voltage, thereby optimizing the power supply of the speed measurement circuit and achieving a speed measurement signal of approximately a square wave with a high level of 28V output by the fan.

[0011] Furthermore, the fan integrated control module is provided with a plurality of pins, and the first fan and the second fan are controlled through different pins respectively.

[0012] Furthermore, the circular electrical connector controls the first fan via pins 1, 3, 5 and 7 disposed therein, and controls the second fan via pins 2, 4, 6 and 8 disposed therein.

[0013] By adopting the above technical solution, the present invention can also bring the following beneficial effects:

[0014] The present invention mentions a multi-channel control fan cooling system, which uses welding to connect the fan lead wires and the circular electrical connector, which is easy to install and disassemble. At the same time, the connector tail is used to reinforce and protect the fan lead wires. The fan is integrated and controlled by setting a fan integrated control module, and voltage processing is performed on the test circuit and the signal output by the speed regulation port through the two-stage transistor and the single-chip microcomputer, so that it is not limited to the power supply voltage of the single-chip microcomputer, and has a wider speed regulation voltage range. At the same time, the voltage of the fan speed measurement signal is the same as the power supply voltage, which is more convenient to use and has the characteristics of easy installation and disassembly, convenient integrated control and convenient high voltage control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The present invention provides a schematic structural diagram of a multi-channel control fan cooling system;

[0017] Figure 2 This is a schematic diagram of a 28V speed regulation circuit in a specific embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of a 28V speed measurement circuit in a specific embodiment of the present invention;

[0019] Among them: 1. first fan; 2. second fan; 3. circular electrical connector; 4. connector tail attachment. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0022] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0025] In one embodiment of the present invention, Figure 1 As shown, a multi-channel control fan cooling system includes a first fan 1, a second fan 2, a circular electrical connector 3 and a connector tail 4, the first fan 1 and the second fan 2 are both connected with fan lead wires, the fan lead wires are connected to the circular electrical connector 3 by welding, and the internal circuits are kept connected, the connector tail 4 is fixed between the fan lead wires and the circular electrical connector 3, so that the fan lead wires are reinforced and protected by using the connector tail 4, the circular electrical connector 3 is provided with a fan integrated control module, the fan integrated control module is provided with a test circuit, the test circuit outputs a fan PWM speed measurement signal, the fan PWM speed measurement signal has a built-in 28V pull-up voltage, the fan integrated control module is provided with a speed regulation port, the speed regulation port outputs a 28V fan PWM speed regulation signal voltage, and the 28V fan PWM speed regulation signal voltage is converted into 3.3V for use inside the fan integrated control module.

[0026] In this fan cooling system, in order to prevent the current from flowing from the speed control port to the 3.3V power supply circuit, a Schottky diode D2 is added between 3.3V and the speed control port. After the speed control signal passes through two stages of transistors, the high level is converted from 28V to 3.3V and input into the microcontroller. After the microcontroller processes the speed control signal, it controls the cycle of the PWM signal of the drive circuit, thereby realizing the high-voltage speed control function of the fan.

[0027] The 28V network of the power supply circuit supplies power to the fan winding. In actual use, the 28V network and the step-down circuit are generally connected in series. The 28V network in the power supply circuit supplies power to the winding. When the first fan 1 and the second fan 2 are running, the back electromotive force generated by the winding will affect the stability of the 28V network voltage. If the 28V network is directly used as the pull-up voltage for the output speed measurement signal, the speed measurement signal will have spikes, affecting the accuracy of the speed measurement signal. Therefore, D3 is connected in parallel at the anti-reverse diode D1, and VCC provides a pull-up voltage for the speed measurement signal, thereby obtaining a speed measurement signal that is approximately a square wave.

[0028] A circular electrical connector 3 is used to perform integrated control of the fans. Pins 1, 3, 5 and 7 arranged inside the connector control the first fan 1. Pins 2, 4, 6 and 8 arranged inside the connector control the second fan 2. The use of the circular electrical connector 3 as a wiring terminal has the advantage of error prevention, thereby achieving the effects of integrated control of the fan system and easy installation and disassembly.

[0029] like Figure 2 As shown in the figure, after the external PWM speed control signal of the system is connected to the system through KZ, it is isolated by the two-stage transistors Q9 and Q10, and a 3.3V PWM signal is obtained at the collector of Q10. The signal is finally input into the single-chip microcomputer, which identifies the duty cycle of the PWM signal to achieve fan speed control. Since the speed control circuit uses a 3.3V power supply, if the PWM speed control signal input from the system exceeds 3.3V, if there is no D2 between R6 and KZ, the input current of the KZ port will flow into the 3.3V network through R6, which will cause the 3.3V voltage to be abnormal, and there is a possibility of burning the single-chip microcomputer.

[0030] like Figure 3 As shown, the microcontroller outputs a speed signal (ALARM) which is isolated by Q11 and then outputs a 28V speed signal from the S port. The power circuit 28V is connected to the winding, and the winding generates a back electromotive force, which causes the 28V voltage to fluctuate. If the speed measurement circuit is powered by a 28V network, the output speed measurement signal will have a spike. Therefore, D3 is connected in parallel at D1, and the speed measurement circuit is powered by the VCC (about 28V) at the negative pole of D3, so that a high-level 28V speed measurement signal that is approximately a square wave is obtained, thereby realizing the 28V speed measurement function of the fan system.

[0031] The multi-channel control multifunctional fan cooling system converts the high-voltage PWM speed regulation signal into a low-voltage PWM signal by adding D2 in the speed regulation circuit, thereby realizing the system's 3.3V-28V or even higher PWM speed regulation function without causing damage to other circuit parts. D3 is connected in parallel at the anti-reverse diode of the power supply circuit to provide a pull-up voltage for the speed measurement signal alone, thereby obtaining a stable speed measurement signal. In short, the present invention has the advantages of easy installation and disassembly, convenient integrated control and convenient high-voltage control, and has a good application prospect.

[0032] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A multi-channel control fan cooling system, characterized in that: The invention comprises a first fan (1), a second fan (2), a circular electrical connector (3) and a connector tail (4), wherein the first fan (1) and the second fan (2) are both connected with fan lead wires, the fan lead wires are connected to the circular electrical connector (3) by welding, and the internal circuits are kept connected, the connector tail (4) is fixed between the fan lead wires and the circular electrical connector (3), so that the fan lead wires are reinforced and protected by using the connector tail (4), the circular electrical connector (3) is provided with a fan integrated control module, the fan integrated control module is provided with a test circuit, the test circuit outputs a fan PWM speed measurement signal, the fan PWM speed measurement signal has a built-in 28V pull-up voltage, the fan integrated control module is provided with a speed regulation port, the speed regulation port outputs a 28V fan PWM speed regulation signal voltage, and the 28V fan PWM speed regulation signal voltage is converted into 3.3V for use inside the fan integrated control module.

2. A multi-channel controlled fan cooling system as claimed in claim 1, characterized in that: The fan integrated control module is provided with a two-stage triode and a single-chip microcomputer. After receiving the fan PWM speed regulation signal processed by the two-stage triode, the single-chip microcomputer converts the 28V high level of the fan PWM speed regulation signal into 3.3V and inputs it into the single-chip microcomputer.

3. A multi-channel controlled fan cooling system as claimed in claim 2, characterized in that: After the single chip microcomputer recognizes the speed regulation signal, it regulates the speed of the fan high voltage by controlling the PWM signal cycle of the driving circuit.

4. A multi-channel controlled fan cooling system as claimed in claim 3, characterized in that: The voltage of the power supply circuit is 3.3V, and a Schottky diode D2 is arranged between the speed regulation port and the power supply circuit.

5. A multi-channel controlled fan cooling system as claimed in claim 3, characterized in that: The power supply improves the voltage of the fan PWM speed regulation signal, thereby optimizing the power supply of the speed measurement circuit and realizing the fan outputting a speed measurement signal with a high level of 28V and a nearly square wave.

6. A multi-channel controlled fan cooling system as claimed in claim 4, characterized in that: The fan integrated control module is provided with a plurality of pins, and the first fan (1) and the second fan (2) are controlled through different pins respectively.

7. A multi-channel controlled fan cooling system as claimed in claim 5, characterized in that: The circular electrical connector (3) controls the first fan (1) via pins No. 1, No. 3, No. 5 and No. 7 arranged inside the circular electrical connector (3), and controls the second fan (2) via pins No. 2, No. 4, No. 6 and No. 8 arranged inside the circular electrical connector (3).

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