Fan control device and fan apparatus

Abstract

This application relates to a fan control device and fan equipment, including a controller motherboard, a switching power supply, and a detection load. The positive terminal of the switching power supply is connected to the positive terminal of the fan, and the negative terminal of the switching power supply is connected to the negative terminal of the fan. The negative terminal of the switching power supply is connected to the ground of the controller motherboard. Both the negative terminal of the switching power supply and the first terminal of the detection load are used to connect to a detection voltage. The second terminal of the detection load is connected to the ground of the controller motherboard, and the first terminal of the detection load serves as a detection port. Based on the level signal of the detection port, the detection of whether the negative terminal of the fan is grounded can be achieved. This method is simple and convenient to implement, and has high detection efficiency. Furthermore, when the negative terminals of the fan and the switching power supply are successfully connected to the ground of the controller motherboard, the electromagnetic compatibility of the fan can be improved, the output air volume of the fan can be stabilized, thereby improving the working performance of the fan and increasing its reliability.

Description

Technical Field

[0001] This application relates to the field of fluid machinery technology, and in particular to a fan control device and fan equipment. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas; it is a type of driven fluid machinery. "Fan" is a common abbreviation for gas compression and gas transport machinery, and commonly refers to ventilators, blowers, wind turbines, etc. Air conditioning fans are a common type of fan, used to deliver gas at different temperatures to a target area, thus regulating the temperature.

[0003] Traditional wind turbines operate under the control of a controller. The controller sends control signals to the wind turbine via control signal lines, and the wind turbine adjusts its operating status according to the control signals. However, the control and wiring requirements of various wind turbines differ, often resulting in wiring designers or wiring personnel missing or making incorrect connections. Improper wind turbine control and wiring directly affect the overall performance and electromagnetic compatibility of the unit, leading to poor wind turbine performance and unreliable operation. Summary of the Invention

[0004] This invention addresses the problems of poor performance and unreliability of traditional fans by proposing a fan control device and fan equipment that can improve the performance and reliability of fans.

[0005] A fan control device includes a controller motherboard, a switching power supply, and a detection load. The positive terminal of the switching power supply is connected to the positive terminal of the fan, the negative terminal of the switching power supply is connected to the negative terminal of the fan, the negative terminal of the switching power supply is connected to the ground of the controller motherboard, the negative terminal of the switching power supply and the first terminal of the detection load are both used to connect to a detection voltage, the second terminal of the detection load is connected to the ground of the controller motherboard, and the first terminal of the detection load serves as a detection port.

[0006] A fan device includes a fan and a fan control device as described above.

[0007] The aforementioned fan control device and fan equipment include a controller motherboard, a switching power supply, and a detection load. The positive terminal of the switching power supply is connected to the positive terminal of the fan, and the negative terminal is connected to the negative terminal of the fan. The negative terminal of the switching power supply is connected to the ground of the controller motherboard. Both the negative terminal of the switching power supply and the first terminal of the detection load are used to connect to the detection voltage. The second terminal of the detection load is connected to the ground of the controller motherboard, and the first terminal of the detection load serves as a detection port. When the negative terminals of the fan and the switching power supply are successfully connected to the ground of the controller motherboard, the detection voltage flows directly to the ground of the controller motherboard, forming a closed-loop circuit, and the current does not flow to the detection port. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard, the detection voltage reaches the ground of the controller motherboard after passing through the detection port and the detection load. Thus, the detection of whether the negative terminal of the fan is grounded can be achieved based on the level signal of the detection port. This method is simple and convenient to implement, with high detection efficiency. In addition, when the negative terminals of the fan and the switching power supply are successfully connected to the ground of the controller motherboard, the electromagnetic compatibility of the fan can be improved, the output air volume of the fan can be stabilized, thereby improving the working performance of the fan and increasing its reliability.

[0008] In one embodiment, the fan control device further includes a pull-up resistor, the first end of which is used to connect to a detection voltage, and the negative terminal of the switching power supply and the first terminal of the detection load are both connected to the second end of the pull-up resistor.

[0009] In one embodiment, the controller motherboard is provided with a power supply circuit, which is connected to the negative terminal of the switching power supply and the first terminal of the detection load, and outputs a detection voltage.

[0010] In one embodiment, the fan control device further includes a shielded wire, through which the negative terminal of the switching power supply is connected to the ground of the controller motherboard.

[0011] In one embodiment, the detection load is a light bulb.

[0012] In one embodiment, the fan control device further includes a main chip, the main chip's digital input interface being connected to the detection port.

[0013] In one embodiment, the wind turbine control device further includes a communication chip connected to the main chip.

[0014] In one embodiment, the fan control device further includes an information prompting device connected to the controller motherboard.

[0015] In one embodiment, the fan control device further includes a host computer connected to the controller motherboard. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of the fan control device in one embodiment;

[0017] Figure 2 This is a schematic diagram of the fan control device in another embodiment. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] In one embodiment, a fan control device is provided, which is connected to a fan and can be used to perform corresponding control functions on the fan. The type of fan is not limited; it can be an air conditioning fan or other types of fans. Please see [link to relevant documentation]. Figure 1 The fan control device includes a controller motherboard 100, a switching power supply 200, and a detection load 300. The positive terminal of the switching power supply 200 is used to connect to the positive terminal of the fan, and the negative terminal of the switching power supply 200 is used to connect to the negative terminal of the fan. The negative terminal of the switching power supply 200 is connected to the ground of the controller motherboard 100. The negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are both used to connect to the detection voltage. The second terminal of the detection load 300 is connected to the ground of the controller motherboard 100, and the first terminal of the detection load 300 serves as a detection port.

[0020] Specifically, the positive terminal of the switching power supply 200 is connected to the positive terminal of the fan, and the negative terminal of the switching power supply 200 is connected to the negative terminal of the fan. The switching power supply 200 provides power to the fan, enabling it to operate normally. The negative terminal of the switching power supply 200 is connected to the ground of the controller motherboard 100. This shared ground between the fan and the controller ensures stable signal reception and output airflow, which is beneficial for maintaining the overall performance of the fan. Furthermore, the orderly fan frequency improves the fan's electromagnetic compatibility, keeping the radiation of electromagnetic compatibility RE102 within acceptable limits.

[0021] Both the negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are used to connect to the detection voltage. The value of the detection voltage is not unique and can be selected according to actual needs. For example, when applied in an air conditioning system to control the air conditioning fan, the level of the detection port is detected by the air conditioning control chip. Generally, the air conditioning control chip detects a high level of 5V, so the detection voltage can be set to 5V. It is understood that in other embodiments, the detection voltage can also be other values, as long as those skilled in the art deem it feasible.

[0022] Both the negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are used to connect to the detection voltage. The second terminal of the detection load 300 is connected to the ground of the controller motherboard 100, and the first terminal of the detection load 300 serves as the detection port. The controller motherboard 100 can be understood as an integrated circuit board integrating various devices and circuits, and the detection port is a port on the controller motherboard 100. Connecting the first terminal of the detection load 300 to the detection port and the second terminal of the detection load 300 to the ground of the controller motherboard 100 increases the integration level of the controller motherboard 100 and also reduces the size of the fan control device. The detection load 300 can be set on the controller motherboard 100. When the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the detection voltage flows directly to the ground of the controller motherboard 100, forming a closed-loop circuit. Current does not flow to the detection port, and the detection port is at a low level. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard 100, the detection voltage passes sequentially through the detection port, the first terminal of the detection load 300, and the second terminal of the detection load 300 before reaching the ground of the controller motherboard 100, resulting in a high level at the detection port. Therefore, whether the negative terminal of the fan is grounded can be determined based on whether the signal at the detection port is high or low, thus achieving convenient, simple, and efficient detection of whether the negative terminal of the fan is grounded.

[0023] In one embodiment, see Figure 1-2 The fan control device also includes a pull-up resistor R. The first terminal of the pull-up resistor R is used to connect the detection voltage. The negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are both connected to the second terminal of the pull-up resistor R. After passing through the pull-up resistor R, the detection voltage reaches the ground of the controller mainboard 100 through the negative terminal of the fan and the negative terminal of the switching power supply 200 when the negative terminal of the fan is grounded. When the negative terminal of the fan is not successfully grounded, it reaches the ground of the controller mainboard 100 through the detection port and the detection load 300. The pull-up resistor R ensures a stable detection voltage level, improving the accuracy of the grounding detection results and the operating performance of the fan control device.

[0024] In one embodiment, the controller motherboard 100 is provided with a power supply circuit, which is connected to the negative terminal of the switching power supply 200 and the first terminal of the detection load 300, and outputs a detection voltage. Integrating the power supply circuit on the controller motherboard 100 can improve the integration level of the controller motherboard 100 and reduce the size of the fan control device. Providing the detection voltage through the power supply circuit on the controller motherboard 100 can simplify the circuit structure of the motor control device, reduce the operating cost of the motor control device, and improve the ease of use of the motor control device.

[0025] In one embodiment, the fan control device further includes a shielded cable, through which the negative terminal of the switching power supply 200 is connected to the ground of the controller motherboard 100. Specifically, the shielded cable is a transmission line that uses a metal mesh braided layer to wrap the signal lines; the braided layer is typically made of red copper or tin-plated copper. The shielding layer of the shielded cable is connected to the ground of the controller motherboard 100, allowing external interference signals to be conducted to the ground. The connection of the negative terminals of the switching power supply 200 and the fan to the ground of the controller motherboard 100 via the shielded cable resists electromagnetic interference from the environment and also prevents its own electromagnetic interference from radiating outwards, thus improving electromagnetic compatibility.

[0026] In one embodiment, the detection load 300 is a light bulb. When the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the detection voltage flows directly to the ground of the controller motherboard 100, forming a closed-loop circuit. Current does not flow to the detection port, resulting in a low level at the detection port and the light bulb not illuminating. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard 100, the detection voltage passes sequentially through the detection port, the first terminal of the light bulb, and the second terminal of the light bulb before reaching the ground of the controller motherboard 100. The detection port then displays a high level, and the light bulb illuminates. Whether the light bulb illuminates or not provides a direct indication of whether the negative terminal of the fan is grounded, enabling convenient, simple, and efficient detection. It is understood that in other embodiments, the detection load 300 can be other types of devices, as long as those skilled in the art deem it feasible.

[0027] In one embodiment, see Figure 1-2The fan control device also includes a main chip 110, whose digital input interface is connected to a detection port. The digital input interface reflects the voltage level of the detection port. By detecting the voltage level of the digital input interface, the main chip 110 can determine whether the fan is connected to the ground of the controller motherboard 100, achieving fast and accurate detection of fan grounding. Specifically, when the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the detection voltage flows directly to the ground of the controller motherboard 100 through the negative terminals of the switching power supply 200 and the fan, forming a closed-loop circuit. Current does not flow to the detection port, and the detection port is at a low level. A high voltage level cannot enter the digital input interface of the main chip 110 and flows directly to ground, so the digital input interface detects a low level. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard 100, the detected voltage passes sequentially through the detection port, the first terminal of the detection load 300, and the second terminal of the detection load 300 before reaching the ground of the controller motherboard 100. The detection port is at a high level, and this high level enters the digital input interface of the main chip 110, which detects a high level. The location of the main chip 110 is not unique. In this embodiment, the main chip 110 can be located on the controller motherboard 100, improving the integration level of the controller motherboard 100. It is understood that in other embodiments, the main chip 110 can also be located in a different position, and the main chip 110 can also be configured with other structures as needed, as long as those skilled in the art deem it feasible.

[0028] In one embodiment, see Figure 1-2 The fan control device also includes a communication chip 120, which is connected to the main chip 110. Specifically, after the main chip 110 detects whether the fan negative terminal is connected to the controller ground through the level status of the switch input interface, it can send the detection result to other devices through the connected communication chip 120, making it convenient for users to understand the grounding status of the fan in a timely manner. The location of the communication chip 120 is not unique. In this embodiment, the communication chip 120 can be located on the controller motherboard 100 to improve the integration level of the controller motherboard 100. It is understood that in other embodiments, the communication chip 120 can also be located in other positions, and the structure of the communication chip 120 can also be selected as needed, as long as those skilled in the art believe it is feasible.

[0029] In one embodiment, see Figure 1-2The fan control device also includes an information prompting device 400, which is connected to the controller motherboard 100. The information prompting device 400 can be connected to the detection port of the controller motherboard 100, and will issue / not issue prompt information based on the voltage level of the detection port. For example, when the detection port is at a high level, a prompt message can be issued to remind the user that the fan has failed to connect successfully to the ground of the controller motherboard 100, allowing the user to understand the grounding status of the fan in a timely manner and address the issue promptly. Expandably, the information prompting device 400 can also be connected to the main chip 110, specifically to the switch input interface of the main chip 110, and will issue / not issue prompt information based on the voltage level of the switch input interface. Alternatively, when the fan control device also includes a communication chip 120, the information prompting device 400 can also be connected to the communication chip 120, and will determine whether to issue a prompt message based on the signal transmitted via communication. The structure of the information prompting device 400 is not unique. For example, it may include one or more of the following: a display panel, a buzzer, an indicator light, and a voice prompting device. The display panel displays rich content, the buzzer has a strong reminder effect, the indicator light has low operating cost, and the voice prompting device is easy to use. Those skilled in the art can select one or more of the above-mentioned devices as the information prompting device 400 according to their needs, or they can use other devices as the information prompting device 400. No limitation is made here.

[0030] In one embodiment, see Figure 1-2The fan control device also includes a host computer 500, which is connected to the controller motherboard 100. Specifically, the host computer 500 can be connected to the detection port of the controller motherboard 100. The controller motherboard 100 reports different signals to the host computer 500 based on the voltage level of the detection port. For example, when the detection port is at a high level, the controller motherboard 100 can report a signal that the fan is not grounded to the host computer 500, allowing the user at the host computer 500 to promptly understand the grounding status of the fan, making it convenient to use and enabling remote alerts. The host computer 500 can also send commands to the controller motherboard 100 to control corresponding devices within the controller motherboard 100. For example, the host computer 500 can send a voltage setting command to the power circuit of the controller motherboard 100, causing the power circuit to output a detection voltage that meets the user's requirements to the pull-up resistor R, improving the reliability of the fan control device. Expandably, the host computer 500 can also connect to the main chip 110, specifically to the main chip 110's switch input interface. The main chip 110 reports different signals to the host computer 500 based on the level status of the switch input interface. Alternatively, when the fan control device also includes a communication chip 120, the communication chip 120 forwards the received information to the host computer 500, facilitating remote monitoring and ease of use. The host computer 500 can generally be a computer or other terminal similar to a motherboard, i.e., a device capable of processing communication data. The host computer 500 reports to the user, who can determine the status based on the data reported by different types of host computers 500.

[0031] To better understand the above embodiments, a detailed explanation is provided below with reference to a specific embodiment. In one embodiment, the fan control device includes a controller motherboard 100, a switching power supply 200, a detection load 300, a pull-up resistor R, a shielded wire, a main chip 110, a communication chip 120, an information display device 400, and a host computer 500. The detection load 300 is a light, the main chip 110 and the communication chip 120 are both located on the controller motherboard 100, the fan is a PWM fan, and the detection voltage is 5V. Figure 1 The diagram shows the grounding of the PWM fan. When the fan is connected to the ground of the controller motherboard 100, the 5V voltage and current output from the power circuit of the controller motherboard 100 flow directly to the ground of the controller motherboard 100 through the pull-up resistor R to form a closed loop circuit. The current cannot flow to the detection port on the controller motherboard 100, so the light will not light up, the main chip 110 will not receive a high-level signal, and will not report the ungrounded state.

[0032] Figure 2This is a schematic diagram of a PWM fan not grounded. When the fan is not connected to the ground of the controller motherboard 100, the 5V voltage and current output from the power supply circuit of the controller motherboard 100 flows through the pull-up resistor R to the detection port of the controller motherboard 100, forming a closed loop circuit. The detection light on the controller motherboard 100 is lit when current flows through it. The main chip 110 receives a high-level signal and reports the grounding failure status. The corresponding equipment status display shows the fault code or status.

[0033] Specifically, select one of the reserved digital input interfaces on the controller motherboard 100, and add a pull-up resistor R to the interface to ensure a stable 5V output level. Select a suitable input chip on the controller motherboard 100 to detect the high-level voltage (typically +5V). Connect the negative terminal of the PWM fan to the negative terminal of the switching power supply 200. Connect a shielded wire to the ground of the controller motherboard 100 at the connection point between the two wires to ensure that the controller motherboard 100 can connect to the negative terminal of the PWM fan. The connection point refers to the connection between the negative terminal of the PWM fan and the negative terminal of the switching power supply 200; the shielded wire connected to the motherboard ground is... Figure 1 The bottom wire connected to GND is shielded because it can resist electromagnetic interference from the environment and prevent its own electromagnetic interference from radiating out.

[0034] The controller motherboard 100 detects the PWM fan grounding signal in two ways: First, when the PWM fan is connected to the ground of the controller motherboard 100, because the pull-up resistor R forms a circuit with the ground of the controller motherboard 100, the high-level signal cannot enter the digital input interface of the main chip 110 on the controller motherboard 100 and flows directly to ground. The controller motherboard 100's digital input interface detects a low level, indicating that the PWM fan is grounded. Second, when the PWM fan is not connected to the ground of the controller motherboard 100, because the pull-up resistor R and the ground of the controller motherboard 100 do not form a circuit, the high-level signal enters the digital input interface of the main chip 110 on the controller motherboard 100. The controller motherboard 100's digital input interface detects a high level, indicating that the PWM fan is not grounded.

[0035] The controller motherboard 100 reports the PWM fan grounding status in two ways: First, it reports locally via the built-in indicator light on the controller motherboard 100. During power-on self-test, the controller motherboard 100 detects the voltage level signal at the grounding detection interface. A high voltage level illuminates the 5V indicator light, while a low voltage level keeps the light off. When the light is on, the PWM fan is not grounded; when the light is off, the PWM fan is grounded. Second, it reports via communication from the controller motherboard 100. The controller motherboard 100 constantly monitors the voltage level signal at the grounding detection interface. A high voltage level indicates that the PWM fan is not grounded, while a low voltage level indicates that the PWM fan is grounded. The controller display board receives the corresponding message and displays the PWM fan grounding status. The host computer 500 receives the corresponding message and reports the PWM fan grounding status. The host computer 500 can be a computer or other terminal similar to the motherboard, i.e., a device capable of processing communication data. The host computer 500 reports to the user, who can determine the status based on the data reported by the different types of host computer 500 reports.

[0036] The aforementioned fan control device includes a controller motherboard 100, a switching power supply 200, and a detection load 300. The positive terminal of the switching power supply 200 is used to connect to the positive terminal of the fan, and the negative terminal of the switching power supply 200 is used to connect to the negative terminal of the fan. The negative terminal of the switching power supply 200 is connected to the ground of the controller motherboard 100. The negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are both used to connect to the detection voltage. The second terminal of the detection load 300 is connected to the ground of the controller motherboard 100, and the first terminal of the detection load 300 serves as a detection port. When the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the detection voltage flows directly to the ground of the controller motherboard 100 to form a closed-loop circuit, and the current does not flow to the detection port. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard 100, the detection voltage reaches the ground of the controller motherboard 100 after passing through the detection port and the detection load 300. Thus, the detection of whether the negative terminal of the fan is grounded can be realized based on the level signal of the detection port. The implementation is simple and convenient, and the detection efficiency is high. In addition, when the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the electromagnetic compatibility of the fan can be improved, the output air volume of the fan can be stabilized, thereby improving the working performance of the fan and increasing the reliability of the fan.

[0037] In one embodiment, a fan device is provided, including a fan and a fan control device as described above. Specifically, the type of fan is not unique; in this embodiment, the fan can be a PWM (Pulse Width Modulation) fan. The PWM fan can receive PWM signals from devices such as the controller motherboard 100, and adjust its own power and output airflow according to the different duty cycles of the received PWM signals, thereby enabling the fan to operate on demand.

[0038] The aforementioned fan equipment includes a controller motherboard 100, a switching power supply 200, and a detection load 300. The positive terminal of the switching power supply 200 is used to connect to the positive terminal of the fan, and the negative terminal of the switching power supply 200 is used to connect to the negative terminal of the fan. The negative terminal of the switching power supply 200 is connected to the ground of the controller motherboard 100. The negative terminal of the switching power supply 200 and the first terminal of the detection load 300 are both used to connect to the detection voltage. The second terminal of the detection load 300 is connected to the ground of the controller motherboard 100, and the first terminal of the detection load 300 serves as a detection port. When the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the detection voltage flows directly to the ground of the controller motherboard 100 to form a closed-loop circuit, and the current does not flow to the detection port. When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard 100, the detection voltage reaches the ground of the controller motherboard 100 after passing through the detection port and the detection load 300. Thus, the detection of whether the negative terminal of the fan is grounded can be realized based on the level signal of the detection port. The implementation is simple and convenient, and the detection efficiency is high. In addition, when the negative terminals of the fan and the switching power supply 200 are successfully connected to the ground of the controller motherboard 100, the electromagnetic compatibility of the fan can be improved, the output air volume of the fan can be stabilized, thereby improving the working performance of the fan and increasing the reliability of the fan.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fan control device, characterized by comprising: The system includes a controller motherboard, a switching power supply, and a detection load. The positive terminal of the switching power supply is connected to the positive terminal of the fan, and the negative terminal of the switching power supply is connected to the negative terminal of the fan. Both the negative terminal of the switching power supply and the negative terminal of the fan are connected to the ground of the controller motherboard. The negative terminal of the switching power supply and the first terminal of the detection load are both used to connect to a detection voltage. The second terminal of the detection load is connected to the ground of the controller motherboard. The first terminal of the detection load serves as a detection port, and the detection load is a light bulb. The system also includes a pull-up resistor, the first terminal of which is used to connect to the detection voltage, and the negative terminal of the switching power supply and the first terminal of the detection load are both connected to the second terminal of the pull-up resistor. When the negative terminal of the fan and the negative terminal of the switching power supply are successfully connected to the ground of the controller motherboard, the detection voltage flows to the ground of the controller motherboard to form a closed loop circuit, the detection port is at a low level, and the lamp does not light up; When the negative terminal of the fan is not successfully connected to the ground of the controller motherboard, the detection voltage passes sequentially through the detection port, the first end of the detection load, and the second end of the detection load before reaching the ground of the controller motherboard. The detection port is at a high level, and the light is lit. The level signal of the detection port is used to determine whether the negative terminal of the fan is connected to the ground of the controller motherboard.

2. The fan control device according to claim 1, characterized in that, The controller motherboard is equipped with a power supply circuit, which is connected to the negative terminal of the switching power supply and the first terminal of the detection load, and outputs a detection voltage.

3. The fan control device according to claim 1, characterized in that, It also includes a shielding wire, through which the negative terminal of the switching power supply is connected to the ground of the controller motherboard.

4. The fan control device according to claim 1, characterized in that, The controller motherboard detects the level signal at the detection port. When a high level is detected, it reports via communication that the negative terminal of the fan is not connected to the ground of the controller motherboard; when a low level is detected, it reports via communication that the negative terminal of the fan is connected to the ground of the controller motherboard.

5. The fan control device according to claim 1, characterized in that, It also includes a main chip, whose digital input interface is connected to the detection port.

6. The fan control device according to claim 5, characterized in that, It also includes a communication chip, which is connected to the main chip.

7. The fan control device according to claim 1, characterized in that, It also includes an information prompting device, which is connected to the controller motherboard.

8. The fan control device according to claim 1, characterized in that, It also includes a host computer, which is connected to the controller motherboard.

9. A fan device, characterized in that, It includes a fan and a fan control device as described in any one of claims 1-8.

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