Computer mainboard

Abstract

The utility model provides a computer mainboard which is provided with a plurality of hard disk indicator light signal interfaces and a hard disk indicator light control circuit. The hard disk indicator light control circuit comprises a plurality of first switch elements, a first resistor, a second resistor, a switch module, a light emitting diode and a third resistor. The first end of each first switch element is connected to the corresponding hard disk indicator light signal interface; the first resistor and the second resistor are connected in series between a first power supply and the ground, the second end of each first switch element is connected between the first resistor and the second resistor and is connected to the control end of the switch module, and the output end of the switch module is connected to the cathode of the light emitting diode. And the anode of the light-emitting diode is connected with a second power supply through the third resistor. Mutual influence between control signals of the hard disk indicator light can be reduced, and normal work of the hard disk indicator light is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of computers, in particular to a computer motherboard. Background Art

[0002] In this era of booming information technology, computers have become quite popular in people's work and life and have become indispensable office and entertainment devices.

[0003] The computer hard disk is the main storage device of a computer. Usually, multiple different types of hard disk interfaces are provided on the motherboard of a desktop computer, such as SATA (Serial Advanced Technology Attachment) hard disk interfaces, PCIe (Peripheral Component Interconnect Express) hard disk interfaces, etc., so as to be able to connect multiple different types of hard disks, such as HDD hard disks (Hard Disk Drive) and SSD hard disks (Solid State Disk).

[0004] In order to display the working state of the hard disk to the user, a hard disk indicator light (generally implemented by a light-emitting diode) is also provided on the motherboard of the computer. By controlling the bright, dark, and flashing states of the hard disk indicator light, the working state of the hard disk and whether it can work normally are presented. For example, it can be set that when the hard disk is reading and writing data, the hard disk indicator light flashes normally; when the hard disk is in an idle state, the hard disk indicator light remains on or flashes at a lower frequency; when the hard disk indicator light is off or flashes abnormally, it can be used to indicate that there is a fault or abnormality in the hard disk. Of course, it is not limited to this.

[0005] In actual settings, although multiple different types of hard disks can be set on the motherboard of a desktop computer, usually the same hard disk indicator light is used to display the data transmission state of the hard disks. Therefore, in the prior art, generally, after performing a wired AND operation on the hard disk indicator light control signals used to indicate the data transmission states of each hard disk, the hard disk indicator light is controlled to indicate whether there is data transmission in the hard disks on the motherboard. Once there is data transmission in the hard disks on the motherboard, the hard disk indicator light control signal corresponding to the hard disk will control the hard disk indicator light to present a flashing state.

[0006] However, with such a setting in the prior art, during the application process, the hard disk indicator often has insufficient brightness, or the hard disk indicator is always on or always off. The main reason is that when the hard disk and the hard disk indicator are working properly, if the hard disk indicator needs to be on, at least one of the multiple hard disk indicator control signals should be at a low level. If the voltage of the hard disk indicator control signal generated by the device that generates the hard disk indicator control signal is not 0 when it is at a low level, or there is mutual influence among several hard disk indicator control signals, it will cause the hard disk indicator to be unable to correctly indicate the data transmission status of the hard disk, resulting in the hard disk indicator being always on, always off, or having insufficient brightness. Summary of the Invention

[0007] The purpose of the present utility model is to provide a computer motherboard. Through the setting of the hard disk indicator control circuit, the mutual influence among the hard disk indicator control signals can be reduced, and the normal operation of the hard disk indicator can be ensured.

[0008] To achieve the above purpose, the present utility model provides a computer motherboard, which is provided with multiple hard disk indicator signal interfaces for outputting hard disk indicator control signals according to the data transmission status of the hard disk. The computer motherboard further includes a hard disk indicator control circuit. The hard disk indicator control circuit includes multiple first switching elements, a first resistor, a second resistor, a switching module, a light-emitting diode, and a third resistor. Among them, the multiple first switching elements respectively correspond to the multiple hard disk indicator signal interfaces, and the first end of each first switching element is connected to the corresponding hard disk indicator signal interface; the first resistor and the second resistor are connected in series between a first power supply and the ground, and the second end of each first switching element is connected between the first resistor and the second resistor and is connected to the control end of the switching module. The output end of the switching module is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to a second power supply through the third resistor. Among them, each first switching element is closed when receiving a high-level signal from the corresponding hard disk indicator signal interface, and is turned on when receiving a low-level signal from the corresponding hard disk indicator signal interface and outputs a low-level signal to the control end of the switching module; the switching module controls the output end to output a low-level signal to the cathode of the light-emitting diode when the control end receives a low-level signal, and controls the output end to output a high-level signal to the cathode of the light-emitting diode when the control end receives a high-level signal.

[0009] Preferably, each first switching element is a diode, the cathode of each diode is connected to the corresponding hard disk indicator signal interface, and the anode of each diode is connected between the first resistor and the second resistor and is connected to the control end of the switching module.

[0010] Preferably, every two of the plurality of diodes are implemented by a common anode dual diode.

[0011] Preferably, the plurality of hard disk indicator signal interfaces include a plurality of SATA hard disk indicator signal interfaces or a plurality of PCIe hard disk indicator signal interfaces.

[0012] Preferably, the plurality of hard disk indicator signal interfaces include a plurality of SATA hard disk indicator signal interfaces and a plurality of PCIe hard disk indicator signal interfaces.

[0013] Preferably, the switch module includes a second switch element and a third switch element. The control end of the second switch element is the control end of the switch module. The output end of the second switch element is connected to the control end of the third switch element. The output end of the third switch element is the output end of the switch module. Wherein, when a low-level signal is received at the control end of the second switch element, the output end of the second switch element outputs a high-level signal to the control end of the third switch element, so that the output end of the third switch element outputs a low-level signal to the cathode of the light-emitting diode; when a high-level signal is received at the control end of the second switch element, the output end of the second switch element outputs a low-level signal to the control end of the third switch element, so that the output end of the third switch element outputs a high-level signal to the cathode of the light-emitting diode.

[0014] Preferably, the switch module further includes a fourth resistor. The second switch element is a first NMOS transistor, and the second switch element is a second NMOS transistor. Wherein, the gate of the first NMOS transistor is the control end of the switch module and is connected to the second ends of the respective first switch elements. The source of the first NMOS transistor is grounded. The drain of the first NMOS transistor is connected to a third power supply via the fourth resistor. The gate of the second NMOS transistor is connected to the drain of the first NMOS transistor. The source of the second NMOS transistor is grounded. The drain of the second NMOS transistor is the output end of the switch module and is connected to the cathode of the light-emitting diode.

[0015] Preferably, the first power supply is the P3V3 power supply on the computer motherboard, and the second power supply and the third power supply are the P5V power supply on the computer motherboard.

[0016] Preferably, the second resistor is connected between the first resistor and the ground, and the resistance value of the second resistor is 10 times that of the first resistor.

[0017] Advantages of the present utility model: Through the setting of the hard disk indicator control circuit on the computer motherboard of the present utility model, multiple hard disk indicator signal interfaces on the computer motherboard are respectively connected to multiple first switching elements, and multiple hard disk indicator control signals are independently connected to the hard disk indicator control circuit through the multiple first switching elements to achieve the control of the same hard disk indicator (light emitting diode), so as to be able to isolate multiple hard disk indicator control signals from multiple hard disk indicator signal interfaces from each other and avoid their mutual influence. At the same time, the hard disk indicator control circuit of the present utility model can ensure that when any hard disk indicator control signal is a low-level signal (as long as there is a low-level hard disk indicator control signal), the hard disk indicator (light emitting diode) can emit light corresponding to the low-level signal. Therefore, the present utility model can ensure the normal operation of the hard disk indicator, enabling the hard disk indicator to accurately indicate the data transmission status of the hard disk. Moreover, through the setting of the switching module in the hard disk indicator control circuit of the present utility model, the hard disk indicator control signal from the hard disk indicator signal interface can be isolated from the hard disk indicator (light emitting diode), thereby avoiding the situation that the power signal of the second power supply leaks to the hard disk indicator control signal through the hard disk indicator and causes damage to related devices. When the switching module is implemented by using a first NMOS transistor and a second NMOS transistor, complete isolation between the hard disk indicator control signal and the hard disk indicator can be achieved, and the brightness of the hard disk indicator can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to further understand the features and technical content of the present utility model, please refer to the following detailed description and drawings of the present utility model. However, the drawings are only for reference and illustration purposes and are not used to limit the present utility model. In the drawings,

[0019] Figure 1 is a schematic structural diagram of the hard disk indicator signal interface and the hard disk indicator control circuit of the computer motherboard of the present utility model.

[0020] Figure 2 is a circuit wiring diagram of the hard disk indicator signal interface and the hard disk indicator control circuit of the computer motherboard according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To further elaborate on the technical means and effects adopted by the present utility model, the following describes in detail the preferred embodiments of the present utility model and their accompanying drawings.

[0022] The present utility model provides a computer motherboard, such as Figure 1As shown, there are multiple hard disk indicator signal interfaces 10 and a hard disk indicator control circuit 20. The multiple hard disk indicator signal interfaces 10 are used to output hard disk indicator control signals according to the data transmission status of the hard disks. The hard disk indicator control circuit 20 includes multiple first switching elements, a first resistor, a second resistor, a switching module, a light-emitting diode, and a third resistor. Among them, the multiple first switching elements respectively correspond to the multiple hard disk indicator signal interfaces 10, and the first end of each first switching element is connected to the corresponding hard disk indicator signal interface 10; the first resistor and the second resistor are connected in series between a first power supply and ground, and the second end of each first switching element is connected between the first resistor and the second resistor and is connected to the control end of the switching module. The output end of the switching module is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to a second power supply via the third resistor.

[0023] Among them, each first switching element is closed when receiving a high-level signal from the corresponding hard disk indicator signal interface 10, and is turned on when receiving a low-level signal from the corresponding hard disk indicator signal interface 10 and outputs a low-level signal to the control end of the switching module; the switching module controls its output end to output a low-level signal to the cathode of the light-emitting diode when receiving a low-level signal at its control end, and controls its output end to output a high-level signal to the cathode of the light-emitting diode when receiving a high-level signal at its control end.

[0024] Specifically, in the present utility model, the light-emitting diode is the hard disk indicator. When the multiple hard disk indicator signal interfaces 10 all output high-level signals, each first switching element is closed, and the control end of the switching module receives a high-level signal due to the setting of the first power supply, the first resistor, and the second resistor. Therefore, the switching module outputs a high-level signal to the cathode of the light-emitting diode through its output end, and then the light-emitting diode is cut off and does not emit light.

[0025] When any one of the multiple hard disk indicator signal interfaces 10 outputs a low-level signal, the first switching element corresponding to the hard disk indicator signal interface 10 that outputs the low-level signal is turned on to output a low-level signal to the control end of the switching module, so that the switching module outputs a low-level signal to the cathode of the light-emitting diode through its output end. Since the anode of the light-emitting diode is connected to the second power supply via the third resistor, the light-emitting diode can be forward-conducted and emit light.

[0026] In the present utility model, since the hard disk indicator control circuit 20 is respectively connected to a plurality of hard disk indicator signal interfaces 10 through a plurality of first switching elements, and a plurality of hard disk indicator control signals of the plurality of hard disk indicator signal interfaces 10 are independently connected to the hard disk indicator control circuit 20, therefore, the present utility model can isolate a plurality of hard disk indicator control signals from a plurality of hard disk indicator signal interfaces 10 to avoid their mutual influence; meanwhile, the hard disk indicator control circuit 20 can ensure that when any hard disk indicator control signal is a low-level signal (as long as there is a low-level hard disk indicator control signal), the light-emitting diode, i.e., the hard disk indicator, can emit light corresponding to the low-level signal. Therefore, the present utility model can ensure the normal operation of the hard disk indicator, enabling the hard disk indicator to accurately indicate the data transmission status of the hard disk; moreover, through the setting of the switching module in the hard disk indicator control circuit 20 of the present utility model, the hard disk indicator control signal from the hard disk indicator signal interface 10 can be isolated from the light-emitting diode, thereby avoiding the situation that the power signal of the second power supply leaks to the hard disk indicator control signal through the light-emitting diode and causing damage to related devices.

[0027] In an embodiment, the plurality of hard disk indicator signal interfaces 10 provided on the computer motherboard may include a plurality of SATA hard disk indicator signal interfaces or a plurality of PCIe hard disk indicator signal interfaces, or may include a plurality of SATA hard disk indicator signal interfaces and a plurality of PCIe hard disk indicator signal interfaces. The hard disk indicator control signals output by these hard disk indicator signal interfaces may come from corresponding devices on the computer motherboard, such as a central processing unit, a bridge chip, a PCIe-to-SATA type chip, etc., which are well-known to those of ordinary skill in the art and will not be elaborated here.

[0028] Further, in a preferred embodiment, each of the first switching elements is a diode, the cathode of each diode is connected to the corresponding hard disk indicator signal interface 10, and the anodes of all the diodes are connected between the first resistor and the second resistor and are connected to the control end of the switching module.

[0029] When the plurality of hard disk indicator signal interfaces 10 all output high-level signals, all the diodes are turned off, the control end of the switching module keeps receiving high-level signals, the switching module outputs a high-level signal to the cathode of the light-emitting diode, and the light-emitting diode is cut off; when any hard disk indicator signal interface 10 outputs a low-level signal, the diode corresponding to the hard disk indicator signal interface 10 that outputs the low-level signal conducts, so that the control end of the switching module changes from receiving a high-level signal to receiving a low-level signal. Correspondingly, the switching module outputs a low-level signal to the cathode of the light-emitting diode, and then the light-emitting diode can conduct forward and emit light.

[0030] As can be seen, in the present utility model, a plurality of diodes are used as the first switching elements and are respectively connected to a plurality of hard disk indicator signal interfaces 10, which can realize the isolation of a plurality of hard disk indicator control signals from the plurality of hard disk indicator signal interfaces 10 in the present utility model with a simple circuit design, avoid their mutual influence, and ensure that when any hard disk indicator control signal is a low-level signal, the light-emitting diode LED, i.e., the hard disk indicator, can emit light corresponding to the low-level signal.

[0031] In an embodiment, every two of the plurality of diodes are realized by a common-anode dual diode.

[0032] Further, the switching module may include a second switching element and a third switching element. The control end of the second switching element is the control end of the switching module. The output end of the second switching element is connected to the control end of the third switching element. The output end of the third switching element is the output end of the switching module. Wherein, when the control end of the second switching element receives a low-level signal, the output end of the second switching element outputs a high-level signal to the control end of the third switching element, so that the output end of the third switching element outputs a low-level signal to the cathode of the light-emitting diode; when the control end of the second switching element receives a high-level signal, the output end of the second switching element outputs a low-level signal to the control end of the third switching element, so that the output end of the third switching element outputs a high-level signal to the cathode of the light-emitting diode.

[0033] In this way, through the arrangement of the second switching element and the third switching element, the hard disk indicator control circuit 20 of the present utility model can completely isolate the hard disk indicator control signal from the hard disk indicator signal interface 10 from the light-emitting diode, thereby avoiding the situation that the power signal of the second power supply leaks to the hard disk indicator control signal through the light-emitting diode and causing damage to related devices.

[0034] In a preferred embodiment, the switching module may include a fourth resistor. The second switching element may be a first NMOS transistor. The second switching element may be a second NMOS transistor. Wherein, the gate of the first NMOS transistor is the control end of the switching module and is connected to the second ends of the respective first switching elements. The source of the first NMOS transistor is grounded. The drain of the first NMOS transistor is connected to a third power supply through the fourth resistor. The gate of the second NMOS transistor is connected to the drain of the first NMOS transistor. The source of the second NMOS transistor is grounded. The drain of the second NMOS transistor is the output end of the switching module and is connected to the cathode of the light-emitting diode.

[0035] Further, the first power supply may be the P3V3 power supply on the computer motherboard, and the second and third power supplies may be the P5V power supply on the computer motherboard.

[0036] Further, the second resistor is connected between the first resistor and the ground, and the resistance value of the second resistor is 10 times that of the first resistor to ensure that the control end of the switch module remains at a high level when all the first switching elements are turned off.

[0037] As Figure 2 shown, it is the circuit wiring diagram of the hard disk indicator signal interface and the hard disk indicator control circuit of the computer motherboard according to an embodiment of the present invention. In this embodiment, the computer motherboard includes a plurality of hard disk indicator signal interfaces 10 and a hard disk indicator control circuit 20.

[0038] The plurality of hard disk indicator signal interfaces 10 include a plurality of SATA hard disk indicator signal interfaces SATA_LED1~SATA_LED4 and a plurality of PCIe hard disk indicator signal interfaces PCIE_SSD_LEDN1~PCIE_SSD_LEDN2.

[0039] The hard disk indicator control circuit 20 includes a plurality of first switching elements 21, a first resistor R1, a second resistor R2, a switch module 22, a light-emitting diode LED, and a third resistor R3. Among them, the plurality of first switching elements 21 of the hard disk indicator control circuit 20 are a plurality of diodes, and every two of the diodes 21 are implemented by a common-anode dual diode D; the switch module 22 of the hard disk indicator control circuit 20 includes a first NMOS transistor Q1 (second switching element), a second NMOS transistor Q2 (third switching element), and a fourth resistor R4.

[0040] Specifically, for every two of the multiple hard disk indicator signal interfaces SATA_LED1~SATA_LED4 and PCIE_SSD_LEDN1~PCIE_SSD_LEDN2, they are connected to a common anode dual diode D, that is, they are respectively connected to the two cathode input terminals of the common anode dual diode D; the first resistor R1 and the second resistor R2 are connected in series between the first power supply P3V3 and the ground, and the anode output terminals of each common anode dual diode D are all connected between the first resistor R1 and the second resistor R2 and connected to the gate of the first NMOS transistor Q1. The source of the first NMOS transistor Q1 is grounded, and the drain of the first NMOS transistor Q1 is connected to the third power supply P5V through the fourth resistor R4; the gate of the second NMOS transistor Q2 is connected to the drain of the first NMOS transistor Q1 (SATA_LED_CPU signal terminal in the figure), the source of the second NMOS transistor Q2 is grounded, and the drain of the second NMOS transistor Q2 is connected to the cathode of the light-emitting diode LED, and the anode of the light-emitting diode LED is connected to the second power supply P5V through the third resistor R3.

[0041] When the hard disk indicator control circuit 20 is working, when the multiple hard disk indicator signal interfaces SATA_LED1~SATA_LED4 and PCIE_SSD_LEDN1~PCIE_SSD_LEDN2 all output high-level signals, the diodes in each common anode dual diode D are all turned off. The gate of the first NMOS transistor Q1 keeps receiving a high-level signal, the first NMOS transistor Q1 is turned on, the second NMOS transistor Q2 is turned off, and the light-emitting diode LED is cut off and does not emit light; when any one of the multiple hard disk indicator signal interfaces SATA_LED1~SATA_LED4 and PCIE_SSD_LEDN1~PCIE_SSD_LEDN2 outputs a low-level signal, the diode corresponding to the hard disk indicator signal interface that outputs the low-level signal is turned on, so that the anode output terminal of the corresponding common anode dual diode D outputs a low-level signal. The gate of the first NMOS transistor Q1 receives a low-level signal, the first NMOS transistor Q1 is turned off, the second NMOS transistor Q2 is turned on, and the light-emitting diode LED is forward biased and thus emits light.

[0042] Refer to Figure 2As shown, when the light-emitting diode LED conducts forward and emits light, the HDD_LED-_D signal at the cathode of the light-emitting diode LED does not directly contact the hard disk indicator control signals output by the multiple hard disk indicator signal interfaces SATA_LED1~SATA_LED4 and PCIE_SSD_LEDN1~PCIE_SSD_LEDN2, thus avoiding the situation where the power signal of the second power supply P5V leaks to the hard disk indicator control signal through the light-emitting diode LED, resulting in damage to related devices. At this time, the first NMOS transistor Q1 and the second NMOS transistor Q2 play a role in isolating the HDD_LED-_D signal and the hard disk indicator control signal, that is to say, the switch module 22 plays a role in isolating the light-emitting diode LED and the hard disk indicator control signal. Moreover, when the second NMOS transistor Q2 conducts, the level of the HDD_LED-_D signal at the cathode of the light-emitting diode LED is low, and the voltage at the cathode of the light-emitting diode LED is 0V, thus ensuring the brightness of the light-emitting diode LED.

[0043] In one embodiment, the first NMOS transistor Q1 and the second NMOS transistor Q2 can use MOS transistors of model LBSS139WT1G; the common anode dual diode D can use a diode of model LBAT54AWT1G; the resistance value of the first resistor R1 can be 10K ohms, and the resistance value of the second resistor R2 can be 100K ohms.

[0044] In summary, through the setting of the hard disk indicator control circuit on the computer motherboard of the present utility model, a plurality of hard disk indicator signal interfaces on the computer motherboard are respectively connected to a plurality of first switching elements, and the plurality of hard disk indicator control signals are independently connected to the hard disk indicator control circuit through the plurality of first switching elements to achieve the control of the same hard disk indicator (light-emitting diode), so that the plurality of hard disk indicator control signals from the plurality of hard disk indicator signal interfaces can be isolated from each other to avoid mutual influence; at the same time, the hard disk indicator control circuit of the present utility model can ensure that when any hard disk indicator control signal is a low-level signal (as long as there is a low-level hard disk indicator control signal), the hard disk indicator (light-emitting diode) can emit light corresponding to the low-level signal. Therefore, the present utility model can ensure the normal operation of the hard disk indicator, enabling the hard disk indicator to accurately indicate the data transmission status of the hard disk; moreover, through the setting of the switching module in the hard disk indicator control circuit of the present utility model, the hard disk indicator control signal from the hard disk indicator signal interface can be isolated from the hard disk indicator (light-emitting diode), thereby avoiding the situation where the power signal of the second power supply leaks to the hard disk indicator control signal through the hard disk indicator and causes damage to related devices. When the switching module is implemented by using a first NMOS transistor and a second NMOS transistor, complete isolation between the hard disk indicator control signal and the hard disk indicator can be achieved, and the brightness of the hard disk indicator can be ensured.

[0045] As described above, for those of ordinary skill in the art, various corresponding changes and deformations can be made according to the technical solutions and technical concepts of the present utility model, and all such changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A computer motherboard is provided with a plurality of hard disk indicator signal interfaces for outputting hard disk indicator control signals according to the data transmission status of the hard disks, characterized in that, The computer motherboard further includes a hard disk indicator control circuit, which includes a plurality of first switching elements, a first resistor, a second resistor, a switching module, a light-emitting diode, and a third resistor. Among them, the plurality of first switching elements respectively correspond to the plurality of hard disk indicator signal interfaces, and the first end of each first switching element is connected to the corresponding hard disk indicator signal interface; the first resistor and the second resistor are connected in series between a first power supply and the ground, and the second end of each first switching element is connected between the first resistor and the second resistor and is connected to the control end of the switching module. The output end of the switching module is connected to the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected to a second power supply through the third resistor. Among them, each first switching element is turned off when receiving a high-level signal from the corresponding hard disk indicator signal interface, and is turned on when receiving a low-level signal from the corresponding hard disk indicator signal interface and outputs a low-level signal to the control end of the switching module; when the control end of the switching module receives a low-level signal, it controls the output end to output a low-level signal to the cathode of the light-emitting diode, and when the control end receives a high-level signal, it controls the output end to output a high-level signal to the cathode of the light-emitting diode.

2. The computer motherboard according to claim 1, characterized in that, Each of the first switching elements is a diode, the cathode of each diode is connected to the corresponding hard disk indicator signal interface, and the anode of each diode is connected between the first resistor and the second resistor and is connected to the control end of the switching module.

3. The computer motherboard according to claim 2, characterized in that, Each two of the plurality of diodes are implemented by a common-anode dual diode.

4. The computer motherboard according to claim 1, characterized in that, The plurality of hard disk indicator signal interfaces include a plurality of SATA hard disk indicator signal interfaces or a plurality of PCIe hard disk indicator signal interfaces.

5. The computer motherboard according to claim 1, characterized in that, The plurality of hard disk indicator signal interfaces include a plurality of SATA hard disk indicator signal interfaces and a plurality of PCIe hard disk indicator signal interfaces.

6. The computer motherboard according to any one of claims 1 to 5, characterized in that The switching module includes a second switching element and a third switching element. The control end of the second switching element is the control end of the switching module. The output end of the second switching element is connected to the control end of the third switching element. The output end of the third switching element is the output end of the switching module. Among them, when the control end of the second switching element receives a low-level signal, the output end of the second switching element outputs a high-level signal to the control end of the third switching element, so that the output end of the third switching element outputs a low-level signal to the cathode of the light-emitting diode; when the control end of the second switching element receives a high-level signal, the output end of the second switching element outputs a low-level signal to the control end of the third switching element, so that the output end of the third switching element outputs a high-level signal to the cathode of the light-emitting diode.

7. The computer motherboard according to claim 6, wherein, The switch module further includes a fourth resistor. The second switching element is a first NMOS transistor, and the second switching element is a second NMOS transistor. Among them, the gate of the first NMOS transistor is the control terminal of the switch module, connected to the second ends of the first switching elements, the source of the first NMOS transistor is grounded, and the drain of the first NMOS transistor is connected to a third power supply through the fourth resistor; the gate of the second NMOS transistor is connected to the drain of the first NMOS transistor, the source of the second NMOS transistor is grounded, and the drain of the second NMOS transistor is the output terminal of the switch module, connected to the cathode of the light-emitting diode.

8. The computer motherboard according to claim 7, wherein, The first power supply is the P3V3 power supply on the computer motherboard, and the second power supply and the third power supply are the P5V power supply on the computer motherboard.

9. The computer motherboard according to claim 8, characterized in that, The second resistor is connected between the first resistor and the ground, and the resistance value of the second resistor is 10 times that of the first resistor.

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