Fan detection system

Abstract

The utility model provides a fan detection system, which is applied to the technical field of fan detection and comprises a fan detection module, a fan group, a voltage detection module and a control module, the control module is respectively connected with the fan detection module, the fan group and the voltage detection module, the fan group is powered by external voltage, and the fan detection module is connected with the fan group; the voltage detection module is used for detecting whether the external voltage is normal or not, when the external voltage is normal, the control module drives the fan set to be started, and the fan detection module is used for detecting whether the fan is in an abnormal state or not when the fan set works. According to the fan detection system, multi-path voltage detection can be achieved, state judgment and linkage control can be conducted on the multiple fans, and the safety of the system can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of fan detection technology, and specifically relates to a fan detection system. Background Technology

[0002] Many electronic and electrical devices, such as communication base stations, servers, and industrial control cabinets, are typically equipped with multiple fans for active cooling to prevent equipment failure due to high temperatures. However, in existing technologies, the management and fault detection of fan groups mainly face the following problems:

[0003] Existing technologies typically use temperature sensors to detect the device temperature and control the fan to start or stop when a set threshold is reached. However, these solutions cannot directly identify fan failures, such as a fan jamming or a power supply malfunction, which poses a potential thermal risk. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a fan detection system that can realize multi-channel voltage detection and perform status judgment and linkage control of multiple fans, which is conducive to improving the safety of the system.

[0005] A fan detection system includes a fan detection module, a fan assembly, a voltage detection module, and a control module. The control module is connected to the fan detection module, the fan assembly, and the voltage detection module. The fan assembly is powered by an external voltage, and the fan detection module is connected to the fan assembly. The voltage detection module is used to detect whether the external voltage is normal. When the external voltage is normal, the control module drives the fan assembly to start. The fan detection module is used to detect whether there is any abnormal state in the fan when the fan assembly is working.

[0006] Preferably, the voltage detection module includes multiple input networks, each of which is connected to an external voltage. The output terminals of the multiple input networks are connected to switch tube one and switch tube two. Switch tube one serves as a signal output terminal and is connected to the control module, while switch tube two is connected to an indicator light.

[0007] Preferably, the input network includes a current-limiting resistor, an optocoupler, and an inverter connected in series. The external voltage is connected through the current-limiting resistor, and the output terminal of the inverter is connected to switch one and switch two, respectively.

[0008] Preferably, the voltage detection module further includes a multiplexer. The input terminal of the multiplexer is connected to the control signal of the control module, and the output terminal of the multiplexer is connected to multiple input networks respectively, for controlling the on / off state of each input network according to the coded information formed by the control signal of the control module.

[0009] Preferably, a counter is configured between the multiplexer and the control module.

[0010] Preferably, the fan detection module includes a current sensing resistor, a voltage comparator, and a third switching transistor. The number of current sensing resistors is the same as the number of fans. The input terminal of the voltage comparator is connected to the current sensing resistor, and the output terminal is connected to the third switching transistor. The third switching transistor serves as the output terminal of the fan detection module and is connected to the control module for transmitting status signals.

[0011] Preferably, the output of the voltage comparator is connected to the base of the three-phase switching transistor Q1 through a resistor R1. The emitter of the three-phase switching transistor Q1 is grounded. A resistor R2 is connected between the base and emitter of the three-phase switching transistor Q1. A diode D1 and a resistor R3 are connected in series to the collector of the three-phase switching transistor Q1. The other end of the resistor R3 is connected to the power supply voltage. The collector of the three-phase switching transistor Q1 serves as the output of the fan detection module, which outputs a status signal to the control module.

[0012] The beneficial effects of this utility model are: the fan detection system detects each fan in the fan group through the fan detection module. It is equipped with a current detection resistor and a voltage comparator, which can determine whether the voltage drop signal generated by the current fluctuation is within the preset threshold. If the current of any fan is abnormal, the system automatically cuts off the power supply to the fan group and reports an alarm information, thereby realizing the early detection of problems such as fan jamming and damage.

[0013] Furthermore, when the control module receives the status signal from the fan detection module, it can determine whether the fan is operating normally based on whether the signal is received, and execute actions such as continue operation, stop, or alarm accordingly, forming a closed-loop control system and enhancing the system's safety and intelligence.

[0014] In addition, the input network, consisting of current-limiting resistors, optocouplers, and inverters, combined with switching transistors and indicator lights, enables rapid identification and alarm of abnormal voltages. Furthermore, the system utilizes a multiplexer in conjunction with the control module to sequentially test each input network, allowing the system to accurately pinpoint which external voltage is abnormal, thus greatly improving the efficiency of fault diagnosis. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a system block diagram of this utility model;

[0017] Figure 2 This is a circuit block diagram of the voltage detection module of this utility model;

[0018] Figure 3 This is a circuit block diagram of the fan detection module of this utility model;

[0019] Figure 4 This is the circuit diagram of the fan detection module of this utility model. Detailed Implementation

[0020] Example 1

[0021] like Figure 1 As shown, a fan detection system includes a fan detection module, a fan assembly, a voltage detection module, and a control module. The fan assembly is powered by an external voltage.

[0022] The voltage detection module detects whether the external voltage is normal. When an abnormal external voltage is detected, the abnormal location is located and the location signal is transmitted to the control module. When the external voltage is normal, the control module drives the fan group to start, so that the fan group can realize the heat dissipation function of the equipment.

[0023] The fan detection module is used to detect whether the current of each fan in the fan group is normal when it is working. If it is normal, it transmits a status signal to the control module, and the control module drives the fan group to continue working. If it is abnormal, the control module cannot receive the status signal, drives the fan group to stop working, and transmits an alarm signal to the staff to facilitate the maintenance of the fan group.

[0024] like Figure 2 As shown, the voltage detection module includes multiple input networks, each corresponding to an external voltage input. The outputs of these input networks are connected to two switching transistors: transistor 1 and transistor 2. Transistor 1 serves as the signal output, while transistor 2 is connected to an indicator light. Each input network includes a current-limiting resistor, an optocoupler, and an inverter. The output of the inverter is connected to transistors 1 and 2, respectively.

[0025] The external voltage flows sequentially through the current-limiting resistor, optocoupler, and inverter. The current-limiting resistor is used for circuit protection. When the external voltage is normal, the optocoupler outputs a low level, which is then inverted by the inverter and outputs a high level. When all external voltages are normal, the outputs of multiple input networks all output a high level. At this time, the first drive switch is turned on and outputs the signal DIO_1_30 to the control module. At the same time, the second drive switch is turned on and illuminates the indicator light, indicating that all external voltages are normal.

[0026] When an external voltage is abnormal, the corresponding optocoupler outputs a high level. After being inverted by an inverter, it outputs a low level. At this time, both switch 1 and switch 2 are in the off state. The control module cannot receive signal DIO_1_30, and the indicator light goes out, indicating that there is an external voltage abnormality.

[0027] In order to locate the abnormal location of the external voltage, the output terminals of multiple input networks are also connected to multiplexers. The multiplexers turn on the corresponding circuits according to the control signals output by the control module.

[0028] like Figure 2 As shown, the control signals include signals DIO_1_26, DIO_1_27, DIO_1_28, and DIO_1_29, which are respectively connected to the four input terminals of the multiplexer. The output terminals of the multiplexer are turned on or off according to their encoding information.

[0029] For example, when the second external voltage is abnormal, the voltage detection module detects the abnormality. At this time, the control module cannot receive the output signal DIO_1_30, and the indicator light does not illuminate. The control module then outputs a control signal to sequentially shut down the corresponding input networks according to the encoded information.

[0030] First, the first input network is shut down, disconnecting the first external voltage. The voltage detection module then performs another detection. At this point, among the remaining input networks, one external voltage is still abnormal. Therefore, the voltage detection module's result is that the voltage is abnormal, meaning the control module cannot receive signal DIO_1_30, and the indicator light goes out.

[0031] Then, the first input network is opened to connect the first external voltage, while the second input network is closed to disconnect the second external voltage. The voltage detection module performs detection again. This time, since the second abnormal voltage is disconnected, the detection result of the voltage detection module is normal, that is, the control module can receive the signal DIO_1_30, and the indicator light is on. Therefore, the location of the abnormal voltage is located at the second external voltage position.

[0032] In addition, a counter is installed between the control module and the multiplexer. The counter is used to improve the stability of the logic control and avoid malfunctions.

[0033] like Figure 3 As shown, the fan detection module includes multiple input terminals, the number of which is the same as the number of fans in the fan group. The input terminals of the fan detection module are connected to the current signals of the fans in the fan group to determine whether the corresponding fan is in a normal operating state.

[0034] Specifically, the fan detection module includes a current sensing resistor, a voltage comparator, and a third switching transistor. The number of current sensing resistors is the same as the number of fans. The input of the voltage comparator is connected to the current sensing resistor, and the output is connected to the third switching transistor. The third switching transistor serves as the output of the fan detection module and is connected to the control module to transmit status signals.

[0035] The fan current signal, after passing through the current sensing resistor, generates a voltage drop, forming a fan voltage signal. This signal is then input to a voltage comparator and compared with the comparator's reference voltage. If the fan voltage signal is within a threshold range, the fan is in normal operation. When all fan voltages are within the threshold range, the driving transistors are all turned on, outputting a status signal to the control module. Upon receiving the status signal feedback, the control module drives the fan assembly to continue operating.

[0036] Taking two-channel fan current signals as an example, the specific circuit diagram of the fan detection module is as follows: Figure 4 As shown, the fan current signals FAN_1_RTN and FAN_2_RTN are connected through the input terminals, and after passing through the current sensing resistors R6 and R12 respectively, they are connected to the voltage comparator. The voltage comparator in this embodiment is an LM339N. The reference voltage of the voltage comparator is implemented by a voltage divider network. The value of the reference voltage can be set according to the specific implementation. The structure of the voltage divider network will not be described in detail here.

[0037] Specifically, the output of the voltage comparator is connected to the base of the three-phase switching transistor Q1 through resistor R1. The emitter of the three-phase switching transistor Q1 is grounded. A resistor R2 is connected between the base and emitter of the three-phase switching transistor Q1. A diode D1 and a resistor R3 are connected in series to the collector of the three-phase switching transistor Q1. The other end of the resistor R3 is connected to the power supply voltage. The collector of the three-phase switching transistor Q1 serves as the output of the fan detection module, outputting a status signal to the control module.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fan detection system, characterized by, It includes a fan detection module, a fan assembly, a voltage detection module, and a control module. The control module is connected to the fan detection module, the fan assembly, and the voltage detection module, respectively. The fan assembly is powered by an external voltage, and the fan detection module is connected to the fan assembly. The voltage detection module is used to detect whether the external voltage is normal. When the external voltage is normal, the control module drives the fan group to start. The fan detection module is used to detect whether there is any abnormal state of the fan when the fan group is working.

2. The fan detection system according to claim 1, characterized in that, The voltage detection module includes multiple input networks, each of which is connected to an external voltage. The outputs of the multiple input networks are connected to switch tube one and switch tube two. Switch tube one is connected to the control module as a signal output terminal, and switch tube two is connected to an indicator light.

3. The fan detection system of claim 2, wherein, The input network includes a current-limiting resistor, an optocoupler, and an inverter connected in series. The external voltage is connected through the current-limiting resistor, and the output terminal of the inverter is connected to switch one and switch two, respectively.

4. The fan detection system of claim 3, wherein, The voltage detection module also includes a multiplexer. The input of the multiplexer is connected to the control signal of the control module, and the output of the multiplexer is connected to multiple input networks. It is used to control the on / off state of each input network according to the encoded information formed by the control signal of the control module.

5. The fan detection system of claim 4, wherein, A counter is configured between the multiplexer and the control module.

6. The fan detection system of claim 1, wherein, The fan detection module includes a current sensing resistor, a voltage comparator, and a third switching transistor. The number of current sensing resistors is the same as the number of fans. The input terminal of the voltage comparator is connected to the current sensing resistor, and the output terminal is connected to the third switching transistor. The third switching transistor serves as the output terminal of the fan detection module and is connected to the control module for transmitting status signals.

7. The fan detection system of claim 6, wherein, The output of the voltage comparator is connected to the base of the three-phase switching transistor Q1 through a resistor R1. The emitter of the three-phase switching transistor Q1 is grounded. A resistor R2 is connected between the base and emitter of the three-phase switching transistor Q1. A diode D1 and a resistor R3 are connected in series to the collector of the three-phase switching transistor Q1. The other end of the resistor R3 is connected to the power supply voltage. The collector of the three-phase switching transistor Q1 serves as the output of the fan detection module, outputting a status signal to the control module.

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