LED control circuit and computer mainboard

Abstract

The utility model relates to the related technical field of LED control circuits, in particular to an LED control circuit and a computer mainboard. The LED control circuit comprises a first signal input end, a second signal input end and a driving control module. The driving control module is connected with the first signal input end and the second signal input end. The driving control module comprises a first control unit, a second control unit, a third control unit and an LED lamp, the first control unit is connected with the second control unit, and the second control unit and the third control unit are respectively connected with the LED lamp. The LED control circuit controls the LED lamp based on high and low level signals sent by the first signal input end and the second signal input end, so that when the same circuit board uses different IC chips, a material control table does not need to control different materials, the circuit is automatically switched to a corresponding circuit structure, the universality of LED control is improved, and the cost is reduced. And the production process is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field related to LED control circuits, and in particular to an LED control circuit and a computer mainboard. Background Art

[0002] With the increasing popularity of desktop computers and the increasing importance of network connectivity, the LAN port's LED indicator has become a key indicator of network connection status. These LEDs are typically divided into connection indicators and data transfer indicators, reflecting network connection status through different colors and flashing patterns, allowing users to quickly understand network status.

[0003] Two common existing designs are: one in which LED0 / LED1 / LED2 outputs a low-level signal to illuminate the LED, and the other in which LED0 / LED1 / LED2 outputs a high-level signal to illuminate the LED. These two designs have different logic requirements for driving LED indicators, requiring adjustments to component configurations to accommodate different integrated circuit (IC) solutions. This prevents universal integration, requiring manual adjustments to components on the circuit board when switching from one IC solution to another, increasing production and maintenance complexity. Utility Model Content

[0004] The embodiments of the present invention provide an LED control circuit and a computer motherboard to solve the problem of how to improve the versatility of LED control and ensure that different IC solutions can share the same hardware settings, thereby simplifying the production process.

[0005] In order to solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: to provide an LED control circuit, comprising: a first signal input terminal, a second signal input terminal and a drive control module, wherein the drive control module is connected to the first signal input terminal and the second signal input terminal respectively; the drive control module comprises a first control unit, a second control unit, a third control unit and an LED lamp, wherein the first control unit is connected to the second control unit, and the second control unit and the third control unit are also connected to the LED lamp respectively; the first signal input terminal transmits the received first drive signal to the first control unit and the third control unit; when the first drive signal is a first high-level signal, the first control unit and the third control unit respond The first control unit is turned on in response to the first drive signal, and the first control unit outputs a low-level signal to the second control unit, the second control unit is turned off in response to the low-level signal, and when the second control unit is turned off, the second signal input terminal outputs a second high-level signal to the third control unit to light up the LED lamp; when the first drive signal is a first low-level signal, the first control unit and the third control unit are turned off in response to the first drive signal, and the first control unit outputs a high-level signal to the second control unit, the second control unit is turned on in response to the high-level signal, and when the second control unit is turned on, the second signal input terminal outputs a second low-level signal to the second control unit to light up the LED lamp.

[0006] Optionally, the second control unit includes a first switch unit and a second switch unit, the third control unit includes a third switch unit and a fourth switch unit, the first signal input end is respectively connected to the first end of the first control unit, the third switch unit and the fourth switch unit, the second end of the first control unit is respectively connected to the first switch unit and the second switch unit, the second signal input end is respectively connected to the second switch unit and the third switch unit, and the second control unit and the third control unit are both connected to the LED lamp.

[0007] Optionally, the first switch unit is connected to the first pin of the LED lamp, the second switch unit is connected to the second pin of the LED lamp, the third switch unit is connected to the first pin of the LED lamp, and the fourth switch unit is connected to the second pin of the LED lamp, the first pin is the anode, and the second pin is the cathode.

[0008] Optionally, the first control unit includes a resistor RL_146, a switch tube Q11, a first power supply, and a resistor RL_15, wherein a first end of the switch tube Q11 is connected to the first signal input end through the resistor RL_146, a second end of the switch tube Q11 is grounded, a third end of the switch tube Q11 is connected to the first power supply through the resistor RL_15, and the third end of the switch tube Q11 serves as the second end of the first control unit.

[0009] Optionally, the first switching unit includes a second power supply and a switch tube Q7, the first end of the switch tube Q7 is connected to the second end of the first control unit, the second end of the switch tube Q7 is connected to the first pin of the LED lamp, and the third end of the switch tube Q7 is connected to the second power supply.

[0010] Optionally, the second switch unit includes a switch tube Q8, a first end of the switch tube Q8 is connected to the second end of the first control unit, a second end of the switch tube Q8 is connected to the second pin of the LED lamp, and a third end of the switch tube Q8 is connected to the second signal input end.

[0011] Optionally, the third switch unit includes a switch tube Q9, a first end of the switch tube Q9 is connected to the first signal input end, a second end of the switch tube Q9 is connected to the first pin of the LED lamp, and a third end of the switch tube Q9 is connected to the second signal input end.

[0012] Optionally, the fourth switch unit includes a switch tube Q10, a first end of the switch tube Q10 is connected to the first signal input end, a second end of the switch tube Q10 is grounded, and a third end of the switch tube Q10 is connected to the second pin of the LED lamp.

[0013] Optionally, the drive control module further includes a resistor RL_67, a first end of the resistor RL_67 is connected to the second end of the switch tube Q7 and the second end of the switch tube Q9 respectively, and a second end of the resistor RL_67 is connected to the first pin of the LED lamp.

[0014] In order to solve the above technical problems, another technical solution adopted by the embodiment of the present utility model is: providing a computer motherboard, which is provided with the above-mentioned LED control circuit.

[0015] Different from the related art, the present invention provides an LED control circuit and a computer motherboard. When the first drive signal is a first high-level signal, the first control unit and the third control unit are turned on in response to the first drive signal, and the first control unit outputs a low-level signal to the second control unit. The second control unit is turned off in response to the low-level signal. When the second control unit is turned off, the second signal input terminal outputs a second high-level signal to the third control unit to illuminate the LED lamp. When the first drive signal is a first low-level signal, the first control unit and the third control unit are turned off in response to the first drive signal, and the first control unit outputs a high-level signal to the second control unit. The second control unit is turned on in response to the high-level signal. When the second control unit is turned on, the second signal input terminal outputs a second low-level signal to the second control unit to illuminate the LED lamp. In this way, when using different IC chips on the same circuit board, there is no need for a material control table to control different materials, thereby achieving automatic circuit switching to the corresponding circuit structure, improving the versatility of LED control and simplifying the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an LED control circuit provided by an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of a drive control module provided by an embodiment of the present utility model;

[0018] Figure 3 This is a circuit structure diagram of an LED control circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. Similarly, when a module / unit is described as "connected" to another module / unit, it can be directly connected to the other module / unit, or there can be one or more intermediate modules / units therebetween. In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the art of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] See also Figure 1 The embodiment of the present invention provides an LED control circuit, which includes a first signal input terminal 10, a second signal input terminal 20 and a drive control module 30. The drive control module 30 is connected to the first signal input terminal 10 and the second signal input terminal 20 respectively.

[0022] The drive control module 30 includes a first control unit 31 , a second control unit 32 , a third control unit 33 and an LED lamp 34 . The first control unit 31 is connected to the second control unit 32 , and the second control unit 32 and the third control unit 33 are also connected to the LED lamp 34 , respectively.

[0023] Regarding the first signal input terminal 10 described above, in this embodiment, the first signal input terminal 10 can provide a first drive signal to the first control unit 31 and the third control unit 33 of the drive control module 30. For example, the CPU chip can send the first drive signal to the first control unit 31 and the third control unit 33 via the first signal input terminal 10 to control the conduction and shutdown of the first control unit 31 and the third control unit 33. The first drive signal can be a high-level signal or a low-level signal, and the corresponding drive signal is provided according to the actual application scenario. It is understood that the circuit can read the VID (identifying the manufacturer of the IC chip) and DID (identifying the device model of the IC chip) of the IC chip through software to accurately identify the type of the IC chip. For example, if the IC chip is identified as Yutai Micro's YT6801, the CPU chip sends a high-level signal to the first control unit 31 and the third control unit 33 via the first signal input terminal 10; if the IC chip is identified as Realtek's RTL8111H, the CPU chip sends a low-level signal to the first control unit 31 and the third control unit 33 via the first signal input terminal 10.

[0024] Regarding the second signal input terminal 20 described above, in this embodiment, the second signal input terminal 20 can provide a second drive signal to the second control unit 32 and the third control unit 33 of the drive control module 30. For example, when the VID (identifying the manufacturer of the IC chip) and the DID (identifying the device model of the IC chip) of the IC chip are read by software to accurately identify the type of the IC chip, the IC chip can provide the second drive signal to the second control unit 32 and the third control unit 33 through the second signal input terminal 20 according to the current network status. It can be understood that, for example, if the IC chip is Yutai Micro's YT6801, when the network status is connected, the IC chip can send a high-level signal (e.g., 3.3V) to the second control unit 32 and the third control unit 33 through the second signal input terminal 20, and when the network status is disconnected, the IC chip can send a low-level signal to the second control unit 32 and the third control unit 33 through the second signal input terminal 20. For another example, if the IC chip is Realtek's RTL8111H, when the network status is connected, the IC chip can send a low-level signal to the second control unit 32 and the third control unit 33 through the second signal input terminal 20; when the network status is disconnected, the IC chip can send a high-level signal (for example, 3.3V) to the second control unit 32 and the third control unit 33 through the second signal input terminal 20.

[0025] Regarding the above-mentioned drive control module 30, in this embodiment, please combine Figure 2 , Figure 2 A schematic diagram of a drive control module provided in an embodiment of the present utility model, wherein the second control unit 32 includes a first switch unit 321 and a second switch unit 322, the third control unit 33 includes a third switch unit 331 and a fourth switch unit 332, the first signal input end 10 is respectively connected to the first end of the first control unit 31, the third switch unit 331 and the fourth switch unit 332, the second end of the first control unit 31 is respectively connected to the first switch unit 321 and the second switch unit 322, the second signal input end 20 is respectively connected to the second switch unit 322 and the third switch unit 331, and the second control unit 32 and the third control unit 33 are both connected to the LED lamp 34.

[0026] Among them, the first switch unit 321 is connected to the first pin of the LED lamp 34, the second switch unit 322 is connected to the second pin of the LED lamp 34, the third switch unit 331 is connected to the first pin of the LED lamp 34, and the fourth switch unit 332 is connected to the second pin of the LED lamp 34. The first pin is the anode and the second pin is the cathode.

[0027] For the above-mentioned LED control circuit, when the first drive signal is a first high-level signal, the first control unit 31 and the third control unit 33 are turned on in response to the first drive signal, and the first control unit 31 outputs a low-level signal to the second control unit 32, the second control unit 32 is turned off in response to the low-level signal, and when the second control unit 32 is turned off, the second signal input end outputs a second high-level signal to the third control unit 33 to light up the LED lamp 34. It can be understood that when it is determined that the IC chip type is Yutai Micro's YT6801 and is in a network state, the first signal input terminal 10 sends a first high-level signal (3.3V, the first high-level signal is used to trigger the conduction mechanism) to turn on the first control unit 31 and the third control unit 33. At this time, the first control unit 31 will send a low-level signal to the second control unit 32 after receiving the first high-level signal to turn off the second control unit 32. Because the third switch unit 331 of the third control unit 33 is connected to the first pin of the LED lamp 34, and the second signal input terminal 20 will send a second high-level signal (3.3V, the second high-level signal is used to provide a voltage) to the third switch unit 331 in a network state, the voltage of the first pin is 3.3V at this time. Since one end of the fourth switch unit 332 of the third control unit is connected to the second pin of the LED lamp 34, and the other end is grounded (such as Figure 3 As shown), at this time, the voltage of the second pin is 0V, so that a voltage difference is formed between the first pin and the second pin, thereby realizing lighting of the LED lamp 34.

[0028] When the first drive signal is a first low-level signal, the first control unit 31 and the third control unit 33 are turned off in response to the first drive signal, and the first control unit 31 outputs a high-level signal to the second control unit 32. The second control unit 32 is turned on in response to the high-level signal. When the second control unit 32 is turned on, the second signal input terminal outputs a second low-level signal to the second control unit 32 to turn on the LED lamp 34. It can be understood that when it is determined that the IC chip type is Realtek's RTL8111H and is in a network state, the first signal input terminal 10 sends a first low-level signal (the first low-level signal is used to trigger the shutdown mechanism) to turn off the first control unit 31 and the third control unit 33. At this time, after receiving the first low-level signal, the first control unit 31 will send a high-level signal (3.3V) to the second control unit 32 to turn on the second control unit 32. Because the first switch unit 321 of the second control unit 32 is connected to the first pin of the LED lamp 34, and the first switch unit 321 is connected to the second power supply (providing a 3.3V voltage, such as Figure 3As shown), the voltage of the first pin is 3.3V at this time, and the second signal input terminal 20 will send a second low level signal (the second low level signal is used to provide a voltage) to the second switch unit 322 in the network state. Since the other end of the second switch unit 322 is connected to the second pin of the LED lamp 34 (as shown), the voltage of the first pin is 3.3V. Figure 3 As shown), at this time, the voltage of the second pin is 0V, so that a voltage difference is formed between the first pin and the second pin, thereby realizing lighting of the LED lamp 34.

[0029] Specifically, see Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the LED control circuit of the present invention. The first control unit 31 includes a resistor RL_146, a switch Q11, a first power supply, and a resistor RL_15. The first terminal of the switch Q11 is connected to the first signal input terminal 10 via the resistor RL_146. The second terminal of the switch Q11 is grounded, and the third terminal of the switch Q11 is connected to the first power supply via the resistor RL_15. The third terminal of the switch Q11 serves as the second terminal of the first control unit. It is understood that the resistor RL_146 is a pull-down resistor with a resistance of 10 kΩ. Its function is to connect the gate of the MOSFET (Q11) to ground (GND). This pull-down resistor ensures that when the first drive signal LAN_LED2_EN is inactive (i.e., the signal is high-impedance or floating), the gate potential is low, thereby maintaining the gate voltage of Q11 at 0V to prevent malfunction. In other words, RL_146 ensures that Q11 remains off when no input signal is present. The switch tube Q11 is an N-channel field effect transistor (MOSFET) used for signal switching control. It has three main pins: 1 corresponds to the gate (G), 3 corresponds to the drain (Drain, D), and 2 corresponds to the source (Source, S). Among them, the gate is used to control whether the MOSFET is on or off. The voltage between the gate and the source determines whether there is current flowing from the drain to the source. In other words, controlling the size of the gate voltage can control the size of the drain current; the drain is used to connect to one end of the power supply or load. When it is turned on, the current flows from the drain to the source; the source, the starting point of the current flow, is usually connected to the ground or a low potential point in the current loop. It should be noted that Figure 3 All the switches (Q7 to Q11) are N-channel field effect transistors and will not be described in detail below. The first power supply can be a 3.3V external power supply. Resistor RL_15 is a pull-up resistor with a resistance of 1KΩ. Its function is: when LAN_LED2_EN is a low-level signal, the switch Q11 is turned off. At this time, the first power supply needs to provide a 3.3V voltage to pull the voltage at the third terminal of the switch Q11 up to 3.3V, that is, to generate a high-level signal ( Figure 3LAN_LED2_EN_N in the LAN).

[0030] The first switch unit 321 includes a second power supply and a switch tube Q7. A first end of the switch tube Q7 is connected to the second end of the first control unit 31, a second end of the switch tube Q7 is connected to the first pin of the LED lamp 34, and a third end of the switch tube Q7 is connected to the second power supply. The second power supply can be a 3.3V external power supply.

[0031] The second switch unit 322 includes a switch tube Q8, a first end of the switch tube Q8 is connected to the second end of the first control unit 31, a second end of the switch tube Q8 is connected to the second pin of the LED lamp 34, and a third end of the switch tube Q8 is connected to the second signal input end 20.

[0032] The third switch unit 331 includes a switch tube Q9, a first end of the switch tube Q9 is connected to the first signal input end 10, a second end of the switch tube Q9 is connected to the first pin of the LED lamp 34, and a third end of the switch tube Q9 is connected to the second signal input end 20.

[0033] The fourth switch unit 332 includes a switch tube Q10 , a first end of the switch tube Q10 is connected to the first signal input end 10 , a second end of the switch tube Q10 is grounded, and a third end of the switch tube Q10 is connected to the second pin of the LED lamp 34 .

[0034] The drive control module 30 also includes a resistor RL_67. A first end of the resistor RL_67 is connected to the second end of the switch Q7 and the second end of the switch Q9, respectively. A second end of the resistor RL_67 is connected to the first pin of the LED lamp 34. It will be appreciated that the resistor RL_67 is a current-limiting resistor with a resistance of 330Ω. Its primary purpose is to limit the current flowing through the LED lamp to prevent damage from excessive current. Specifically, the resistor RL_67 ensures that the current flowing through the LED lamp remains within a safe range while also affecting the brightness of the LED lamp.

[0035] It should be noted that the LED control circuit provided by the embodiment of the present invention solves the problem of how to improve the versatility of LED control and ensure that different IC solutions can share the same hardware settings, thereby simplifying the production process. The working principle of the circuit is as follows: when the IC chip type is determined to be the first type (such as Yutai Micro's YT6801), the first signal input terminal 10 sends a first high-level signal (LAN_LED2_EN, 3.3V, LAN_LED2_EN is used to trigger the conduction mechanism) to turn on the switch tube Q11, the switch tube Q9 and the switch tube Q10. When the switch tube Q11 is turned on, the current flows from the drain of the switch tube Q11 to the source and then to the ground. At this time, the voltage of the third terminal of the switch tube Q11 is 0V, which generates a low-level signal (LAN_LED2_EN_N). Because LAN_LED2_EN_N is connected to the gates of the switch tubes Q7 and Q8 respectively, the switch tubes Q7 and Q8 are turned on. Q8 is in the off state. If the computer is in a network state, that is, when the network cable is connected, the second signal input terminal 20 will send a high-level signal (LAN_LED2, 3.3V). At this time, the voltage input from the switch tube Q9 to the first pin of the LED lamp is 3.3V, and the source of the switch tube Q10 is grounded, that is, the voltage of the second pin of the LED lamp is 0V, so that a voltage difference is formed between the first pin and the second pin, thereby lighting the LED lamp; if the computer is in an offline state, that is, when the network cable is not connected, the second signal input terminal 20 will send a low-level signal (LAN_LED2, 0V). At this time, the voltage of the first pin of the LED lamp is 0V, and the voltage of the second pin is also 0V, and no voltage difference is formed, thereby turning off the LED lamp.

[0036] When the IC chip type is determined to be the second type (such as Realtek's RTL8111H), the first signal input terminal 10 sends a first low-level signal (LAN_LED2_EN, 0V, LAN_LED2_EN is used to trigger the shutdown mechanism) to turn off the switch tubes Q11, Q9, and Q10. When the switch tube Q11 is turned off, the voltage at the third terminal of the switch tube Q11 is pulled up to 3.3V through the pull-up resistor RL_15, generating a high-level signal (LAN_LED2_EN_N). Since LAN_LED2_EN_N is connected to the gates of the switch tubes Q7 and Q8, respectively, the switch tubes Q7 and Q8 are in the on state. If the computer is in the network state, that is, connected When the network cable is connected, the second signal input terminal 20 will send a low-level signal (LAN_LED2, 0V). At this time, the voltage input from the switch tube Q7 to the first pin of the LED lamp is 3.3V, and the low-level signal sent by the second signal sending terminal 20 flows through the switch tube Q8 to the second pin of the LED lamp, that is, the voltage of the second pin of the LED lamp is 0V, so that a voltage difference is formed between the first pin and the second pin, thereby realizing the lighting of the LED lamp; if the computer is in an offline state, that is, when the network cable is not connected, the second signal input terminal 20 will send a high-level signal (LAN_LED2, 3.3V). At this time, the voltage of the first pin of the LED lamp is 3.3V, and the voltage of the second pin is also 3.3V, and no voltage difference is formed, thereby turning off the LED lamp.

[0037] The embodiment of the utility model uses the above method to make it possible for the same circuit board to use different IC chips without the need for a material control table to control different materials, thereby achieving automatic switching of the circuit to the corresponding circuit structure, improving the versatility of LED control, and simplifying the production process.

[0038] The embodiment of the present invention further provides a computer motherboard, which is provided with the above-mentioned LED control circuit. The specific structure and function of the LED control circuit can be referred to the above-mentioned embodiment, which will not be described in detail here.

[0039] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An LED control circuit, characterized in that: include: a first signal input terminal, a second signal input terminal, and a drive control module, wherein the drive control module is connected to the first signal input terminal and the second signal input terminal respectively; The drive control module includes a first control unit, a second control unit, a third control unit and an LED lamp, the first control unit is connected to the second control unit, and the second control unit and the third control unit are also connected to the LED lamp respectively; The first signal input terminal transmits the received first driving signal to the first control unit and the third control unit; When the first driving signal is a first high-level signal, the first control unit and the third control unit are turned on in response to the first driving signal, and the first control unit outputs a low-level signal to the second control unit, the second control unit is turned off in response to the low-level signal, and when the second control unit is turned off, the second signal input terminal outputs a second high-level signal to the third control unit, so that the LED lamp is lit; When the first drive signal is a first low-level signal, the first control unit and the third control unit are turned off in response to the first drive signal, and the first control unit outputs a high-level signal to the second control unit, the second control unit is turned on in response to the high-level signal, and when the second control unit is turned on, the second signal input terminal outputs a second low-level signal to the second control unit to light up the LED lamp.

2. The LED control circuit according to claim 1, characterized in that: The second control unit includes a first switch unit and a second switch unit, the third control unit includes a third switch unit and a fourth switch unit, the first signal input end is respectively connected to the first end of the first control unit, the third switch unit and the fourth switch unit, the second end of the first control unit is respectively connected to the first switch unit and the second switch unit, the second signal input end is respectively connected to the second switch unit and the third switch unit, and the second control unit and the third control unit are both connected to the LED lamp.

3. The LED control circuit according to claim 2, characterized in that: The first switch unit is connected to the first pin of the LED lamp, the second switch unit is connected to the second pin of the LED lamp, the third switch unit is connected to the first pin of the LED lamp, and the fourth switch unit is connected to the second pin of the LED lamp. The first pin is an anode and the second pin is a cathode.

4. The LED control circuit according to claim 2, characterized in that: The first control unit includes a resistor RL_146, a switch tube Q11, a first power supply, and a resistor RL_15. A first end of the switch tube Q11 is connected to the first signal input end through the resistor RL_146, a second end of the switch tube Q11 is grounded, and a third end of the switch tube Q11 is connected to the first power supply through the resistor RL_15. The third end of the switch tube Q11 serves as the second end of the first control unit.

5. The LED control circuit according to claim 3, characterized in that: The first switching unit includes a second power supply and a switch tube Q7, the first end of the switch tube Q7 is connected to the second end of the first control unit, the second end of the switch tube Q7 is connected to the first pin of the LED lamp, and the third end of the switch tube Q7 is connected to the second power supply.

6. The LED control circuit according to claim 3, characterized in that: The second switch unit includes a switch tube Q8, a first end of the switch tube Q8 is connected to the second end of the first control unit, a second end of the switch tube Q8 is connected to the second pin of the LED lamp, and a third end of the switch tube Q8 is connected to the second signal input end.

7. The LED control circuit according to claim 5, characterized in that: The third switch unit includes a switch tube Q9, a first end of the switch tube Q9 is connected to the first signal input end, a second end of the switch tube Q9 is connected to the first pin of the LED lamp, and a third end of the switch tube Q9 is connected to the second signal input end.

8. The LED control circuit according to claim 3, characterized in that: The fourth switch unit includes a switch tube Q10, a first end of the switch tube Q10 is connected to the first signal input end, a second end of the switch tube Q10 is grounded, and a third end of the switch tube Q10 is connected to the second pin of the LED lamp.

9. The LED control circuit according to claim 7, characterized in that: The drive control module further includes a resistor RL_67 , a first end of which is connected to the second end of the switch tube Q7 and the second end of the switch tube Q9 , respectively, and a second end of the resistor RL_67 is connected to the first pin of the LED lamp.

10. A computer motherboard, characterized in that: The computer mainboard is provided with the LED control circuit according to any one of claims 1 to 9.

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