Indicator lamp control circuit and computer mainboard with same

Abstract

The utility model provides an indicating lamp control circuit and a computer mainboard with the indicating lamp control circuit. The indicating lamp control circuit comprises a control unit with a GPIO port, a first LED indicating lamp and a second LED indicating lamp. The cathode of the first LED indicating lamp is connected with the anode of the second LED indicating lamp, and the connection point is a first connection point. The first end of the first resistor is connected to the anode of the first LED indicating lamp, and the second end is used for receiving voltage applied by the first power supply. The first end of the second resistor is connected to the cathode of the second LED indicating lamp, and the second end is grounded. The third resistor is connected between the second power supply and the first connection point. The fourth resistor is connected between the first connection point and the ground. The switch unit is turned on to output a low level signal to the first connection point when receiving a first level signal output by the GPIO port, and is turned off when receiving a second level signal output by the GPIO port. According to the utility model, the two LED indicating lamps can be controlled through one path of GPIO signal of the control unit.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to an indicator light control circuit and a computer mainboard with the indicator light control circuit. Background Art

[0002] Indicator lights are components found in most electronic devices, used to indicate the operating status of the device and its internal modules. For example, a desktop computer typically has a power indicator, hard drive access indicator, fault indicator, reset indicator, and other indicators to indicate the working status of related devices or the computer's current operating status.

[0003] In existing desktop computers or other electronic devices with multiple indicator lights, each GPIO (General Purpose Input / Output) port on the control unit is typically connected to a corresponding indicator light, meaning that each indicator light is controlled by a single GPIO signal. Taking a desktop computer as an example, the power indicator and reset indicator light are controlled separately by two GPIO signals from the control unit to indicate the current motherboard status or highlight the location of the power and reset buttons on the front panel.

[0004] However, as the functions of computers and other electronic devices continue to increase, the GPIO port resources of the control unit will become tight and insufficient. It is necessary to optimize certain circuits of these electronic devices to share GPIO ports as much as possible, or to delete certain functions to save some GPIO ports.

[0005] To address this situation, if there are multiple indicator lights on the motherboard of an electronic device, the use of GPIO signals to control the indicator lights can be reduced by optimizing the circuit, thus freeing up the corresponding GPIO ports for other necessary functions. This is a problem that needs to be solved urgently. Summary of the Invention

[0006] The purpose of the utility model is to provide an indicator light control circuit and a computer motherboard with the indicator light control circuit, which can control two LED indicator lights through a GPIO signal of a control unit, thereby ensuring the realization of the respective functions of the two LED indicator lights and saving the use of the GPIO port of the control unit.

[0007] To achieve the above-mentioned objectives, the present invention provides an indicator light control circuit, comprising a control unit, a first LED indicator light and a second LED indicator light, the control unit comprising a GPIO port, the indicator light control circuit further comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a switch unit, a first power supply and a second power supply, wherein the cathode of the first LED indicator light is connected to the anode of the second LED indicator light, and the connection point thereof is a first connection point; the first end of the first resistor is connected to the anode of the first LED indicator light, and the second end of the first resistor is used to receive the voltage applied by the first power supply; the first end of the second resistor is connected to the cathode of the second LED indicator light, and the second end of the second resistor is grounded; the third resistor is connected between the second power supply and the first connection point; the fourth resistor is connected between the first connection point and the ground; the switch unit is connected between the GPIO port of the control unit and the first connection point, and the switch unit is turned on and outputs a low-level signal to the first connection point when receiving a first-level signal output by the GPIO port, and is turned off when receiving a second-level signal output by the GPIO port.

[0008] Preferably, when the switch unit is closed, the voltage between the second end of the first resistor and the first connection point is less than the forward conduction voltage of the first LED indicator, and the voltage between the first connection point and the ground is greater than the forward conduction voltage of the second LED indicator; when the switch unit is turned on, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator.

[0009] Preferably, when the switch unit is closed, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator, and the voltage between the first connection point and the ground is greater than the forward conduction voltage of the second LED indicator; when the switch unit is turned on, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator.

[0010] Preferably, the switching unit includes an NMOS tube, the gate of the NMOS tube is connected to the third power supply, the source of the NMOS tube is connected to the GPIO port of the control unit, the drain of the NMOS tube is connected to the first connection point, the first level signal is a low level signal, and the second level signal is a high level signal.

[0011] Preferably, the output voltage of the third power supply is 3.3V, the control unit is an embedded controller, and the second level signal is 3.3V.

[0012] Preferably, the indicator light control circuit also includes a fifth resistor and a sixth resistor, the first end of the fifth resistor is connected to the first power supply; the second end of the fifth resistor, the first end of the sixth resistor and the second end of the first resistor are connected; the second end of the sixth resistor is grounded.

[0013] Preferably, the output voltage of the first power supply is 12V, and the output voltage of the second power supply is 12V.

[0014] Preferably, the indicator light control circuit further includes a seventh resistor and a fourth power supply, and the seventh resistor is connected between the fourth power supply and the GPIO port of the control unit.

[0015] Preferably, the output voltage of the fourth power supply is 3.3V.

[0016] The utility model also provides a computer mainboard, comprising the above-mentioned indicator light control circuit.

[0017] The beneficial effects of the present invention are as follows: the indicator light control circuit of the present invention and the computer motherboard having the indicator light control circuit can control two LED indicator lights through a single GPIO port of the control unit, that is, one GPIO signal, to ensure the realization of the respective functions of the two LED indicator lights, thereby saving the use of the GPIO port of the control unit; moreover, the indicator light control circuit of the present invention can also realize different modes of controlling the two LED indicator lights through simple resistance and / or power supply adjustment as needed, so as to be suitable for different usage scenarios of the LED indicator lights, for example, the scenario of lighting up the two LED indicator lights separately, or the scenario of lighting up the two LED indicator lights together and lighting up only one of the LED indicator lights, thereby enriching its application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0019] Figure 1 This is a circuit wiring diagram of the indicator light control circuit of the present utility model.

[0020] Figure 2 This is a circuit wiring diagram of an indicator light control circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.

[0022] The utility model provides an indicator light control circuit and a computer motherboard with the indicator light control circuit, which can control two indicator lights through a GPIO signal of a control unit, thereby ensuring the realization of the respective functions of the two indicator lights and saving the use of the GPIO port of the control unit.

[0023] like Figure 1 As shown, the indicator light control circuit of the present invention includes a control unit 10, a first LED (Light Emitting Diode) indicator LED1, a second LED indicator LED2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a switch unit 20, a first power supply PS1, and a second power supply PS2. The control unit 10 includes a GPIO port.

[0024] The cathode of the first LED indicator LED1 is connected to the anode of the second LED indicator LED2, and their connection point D1 is a first connection point. The first end of the first resistor R1 is connected to the anode of the first LED indicator LED1, and the second end of the first resistor R1 is used to receive the voltage applied by the first power supply PS1. The first end of the second resistor R2 is connected to the cathode of the second LED indicator LED2, and the second end of the second resistor R2 is grounded. The third resistor R3 is connected between the second power supply PS2 and the first connection point D1. The fourth resistor R4 is connected between the first connection point D1 and ground. The switch unit 20 is connected between the GPIO port of the control unit 10 and the first connection point D1. The switch unit 20 is turned on and outputs a low-level signal to the first connection point D1 when it receives a first-level signal output by the GPIO port, and is turned off when it receives a second-level signal output by the GPIO port.

[0025] Specifically, when the GPIO port of the control unit 10 outputs a first level signal to the switch unit 20, the switch unit 20 turns on and outputs a low level signal to the first connection point D1. At this time, the first LED indicator LED1 can be lit under the action of the voltage applied by the first power supply PS1, and the second LED indicator LED2 is not lit because the first connection point D1 receives a low level signal.

[0026] When the GPIO port of the control unit 10 outputs a second level signal to the switch unit 20, the switch unit 20 is closed, and the voltage between the first connection point D1 and the ground is the voltage applied to the fourth resistor R4 in the voltage divider circuit formed by the second power supply PS2, the third resistor R3, and the fourth resistor R4. At this time, the second LED indicator LED2 will light up due to this voltage, and whether the first LED indicator LED1 will light up can be controlled by setting the voltage between the second end of the first resistor R1 and the first connection point D1 as needed. For example, when the voltage between the second end of the first resistor R1 and the first connection point D1 is less than the forward conduction voltage of the first LED indicator LED1, the first LED indicator LED1 will not light up; when the voltage between the second end of the first resistor R1 and the first connection point D1 is greater than the forward conduction voltage of the first LED indicator LED1, the first LED indicator LED1 will light up.

[0027] Thus, the indicator light control circuit of the present invention can control the two LED indicator lights LED1 and LED2 through a single GPIO port of the control unit 20, that is, one GPIO signal, so that they can realize their respective functions, thereby saving the use of the GPIO port of the control unit. Moreover, the indicator light control circuit of the present invention can also be set as needed to light up the first LED indicator light LED1 and the second LED indicator light LED2 separately, or to light up the first LED indicator light LED1 and the second LED indicator light LED2 together, or to light up only the first LED indicator light LED1, so as to realize different ways of lighting up the two LED indicator lights LED1 and LED2.

[0028] Specifically, the indicator light control circuit of the present invention can realize the scene of lighting up the first LED indicator light LED1 and the second LED indicator light LED2 respectively through the following settings:

[0029] When the switch unit 20 is closed, the voltage between the second end of the first resistor R1 and the first connection point D1 is less than the forward conduction voltage of the first LED indicator LED1, and the voltage between the first connection point D1 and the ground is greater than the forward conduction voltage of the second LED indicator LED2; when the switch unit 20 is turned on, the voltage between the second end of the first resistor R1 and the first connection point D1 is greater than the forward conduction voltage of the first LED indicator LED1.

[0030] Thus, when the switch unit 20 is turned off, only the second LED indicator LED2 in the indicator light control circuit is lit; when the switch unit 20 is turned on, only the first LED indicator LED1 in the indicator light control circuit is lit.

[0031] The indicator light control circuit of the present invention can realize the scenarios of lighting up the first LED indicator light LED1 and the second LED indicator light LED2 together or lighting up only the first LED indicator light LED1 through the following settings:

[0032] When the switch unit 20 is closed, the voltage between the second end of the first resistor R1 and the first connection point D1 is greater than the forward conduction voltage of the first LED indicator LED1, and the voltage between the first connection point D1 and the ground is greater than the forward conduction voltage of the second LED indicator LED2; when the switch unit 20 is turned on, the voltage between the second end of the first resistor R1 and the first connection point D1 is greater than the forward conduction voltage of the first LED indicator LED1.

[0033] Thus, when the switch unit 20 is turned off, both the first LED indicator LED1 and the second LED indicator LED2 in the indicator light control circuit are lit; when the switch unit 20 is turned on, only the first LED indicator LED1 in the indicator light control circuit is lit.

[0034] When the switch unit 20 is turned off and on, the voltage between the second end of the first resistor R1 and the first connection point D1, and the voltage between the first connection point D1 and the ground can be controlled by specific settings of the first power supply PS1, the second power supply PS2, the third resistor R3 and the fourth resistor R4.

[0035] Furthermore, the indicator light control circuit may also include a fifth resistor R5 and a sixth resistor R6, the first end of the fifth resistor R5 is connected to the first power supply PS1; the second end of the fifth resistor R5, the first end of the sixth resistor R6 and the second end of the first resistor R1 are connected, and their connection point D2 is the second connection point; the second end of the sixth resistor R6 is grounded.

[0036] Thus, the voltage applied by the first power source PS1 to the second end of the first resistor R1 is the voltage applied to the sixth resistor R6 by the voltage divider circuit formed by the first power source PS1, the fifth resistor R5, and the sixth resistor R6. Thus, the voltage between the second end of the first resistor R1 (the second connection point D2) and the first connection point D1, and the voltage between the first connection point D1 and ground, can be controlled by specifically configuring the first power source PS1, the second power source PS2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6. In particular, in an application environment where the first power source PS1 and the second power source PS2 are set power sources, the voltage between the second end of the first resistor R1 (the second connection point D2) and the first connection point D1, and the voltage between the first connection point D1 and ground, can be controlled by adjusting the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6. This will be further illustrated below by example.

[0037] Of course, the first power supply PS1 may also be directly connected to the second end of the first resistor R1 to supply power thereto. This may be configured appropriately according to the application environment of the indicator light control circuit.

[0038] Furthermore, the switching unit 20 may include an NMOS tube Q1, the gate of the NMOS tube Q1 is connected to the third power supply PS3, the source of the NMOS tube Q1 is connected to the GPIO port of the control unit 10, the drain of the NMOS tube Q1 is connected to the first connection point D1, the first level signal is a low level signal, and the second level signal is a high level signal.

[0039] When the GPIO port of the control unit 10 outputs a first-level signal to the source of the NMOS transistor Q1, the NMOS transistor Q1 is turned on, that is, the switch unit 20 is turned on, and the drain of the NMOS transistor Q1 outputs a low-level signal (the first-level signal) to the first connection point D1. When the GPIO port of the control unit 10 outputs a second-level signal to the source of the NMOS transistor Q1, the NMOS transistor Q1 is turned off, that is, the switch unit 20 is turned off, and the voltage between the first connection point D1 and ground is the voltage applied to the fourth resistor R4 in the voltage divider circuit formed by the second power supply PS2, the third resistor R3, and the fourth resistor R4.

[0040] Of course, the structure of the switch unit 20 is not limited thereto, and other switch structures that can achieve the same function may also be used.

[0041] Furthermore, the indicator light control circuit may also include a seventh resistor R7 and a fourth power supply PS4. The seventh resistor R7 is connected between the fourth power supply PS4 and the GPIO port of the control unit 10 and serves as a pull-up resistor, which helps to extend the transmission distance of the signal output by the GPIO port and ensure its transmission stability.

[0042] Next, the working principle of the indicator light control circuit of the present invention will be further described with reference to a specific embodiment.

[0043] like Figure 2 FIG2 is a circuit wiring diagram of an embodiment of an indicator light control circuit of the present invention disposed on a computer motherboard. The indicator light control circuit is an indicator light control circuit on the computer motherboard and includes a control unit 10, a first LED indicator LED1, a second LED indicator LED2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a switch unit 20, a first power supply PS1, a second power supply PS2, and a fourth power supply PS4. The control unit 10 includes a GPIO port.

[0044] The first end of the fifth resistor R5 is connected to the first power supply PS1; the second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, and the connection point D2 is the second connection point; the second end of the sixth resistor R6 is grounded.

[0045] The cathode of the first indicator LED LED1 is connected to the anode of the second indicator LED LED2, and the connection point D1 is a first connection point. The first end of the first resistor R1 is connected to the anode of the first indicator LED LED1, and the second end of the first resistor R1 is connected to the second connection point D2. The first end of the second resistor R2 is connected to the cathode of the second indicator LED LED2, and the second end of the second resistor R2 is grounded.

[0046] The third resistor R3 is connected between the second power source PS2 and the first connection point D1. The fourth resistor R4 is connected between the first connection point D1 and the ground.

[0047] The switch unit 20 includes an NMOS transistor Q1 , a gate of the NMOS transistor Q1 connected to the third power supply PS3 , a source of the NMOS transistor Q1 connected to the GPIO port of the control unit 10 , and a drain of the NMOS transistor Q1 connected to the first connection point D1 .

[0048] The seventh resistor R7 is connected between the fourth power source PS4 and the GPIO port of the control unit 10 .

[0049] In this embodiment, the first power supply PS1 and the second power supply PS2 are P12V power supplies on the computer motherboard, each with an output voltage of 12V; the third power supply PS3 and the fourth power supply PS4 are P3V3 power supplies on the computer motherboard, each with an output voltage of 3.3V. The first level signal output by the GPIO port of the control unit 10 is a low-level signal of 0V, and the second level signal output is a high-level signal of 3.3V. Preferably, the control unit 10 may be an embedded controller (EC).

[0050] In this embodiment, the resistance of the third resistor R3 is equal to the resistance of the fourth resistor R4. Figure 2 As shown, both are 330 ohms, but not limited thereto; the ratio of the resistance of the fifth resistor R5 to the resistance of the sixth resistor R6 is approximately 1:3, as Figure 2 As shown, the resistance of the fifth resistor R5 is 330 ohms, and the resistance of the sixth resistor R6 is 1K ohms, but the present invention is not limited thereto.

[0051] The first LED indicator LED1 may be a white LED indicator with a forward conduction voltage of 3.2V; the second LED indicator LED2 may be a red LED indicator with a forward conduction voltage of 2V, but is not limited thereto.

[0052] In this way, when the indicator light control circuit is working, when the GPIO port of the control unit 10 outputs a first level signal (low level signal, 0V) to the source of the NMOS transistor Q1, the NMOS transistor Q1 is turned on, and the drain of the NMOS transistor Q1 outputs a low level signal (first level signal, 0V) to the first connection point D1, the second LED indicator LED2 is not lit, and the voltage between the second end of the first resistor R1, i.e., the second connection point D2, and the first connection point D1 is approximately 9V, which is greater than the forward conduction voltage of the first LED indicator LED1 of 3.2V, and the first LED indicator LED1 is lit.

[0053] When the GPIO port of the control unit 10 outputs a second-level signal (a high-level signal, 3.3V) to the source of the NMOS transistor Q1, the NMOS transistor Q1 is turned off. The voltage between the first connection point D1 and ground is the voltage applied to the fourth resistor R4 by the second power supply PS2, which is 6V. This voltage is greater than the forward conduction voltage of the second LED indicator LED2, which is 2V. The second LED indicator LED2 is illuminated. However, the voltage between the second end of the first resistor R1, i.e., the second connection point D2, and the first connection point D1, is approximately 3V, which is less than the forward conduction voltage of the first LED indicator LED1, which is 3.2V. The first LED indicator LED1 is not illuminated. It can be seen from this that the main function of the NMOS transistor Q1, i.e., the switch unit 20, is to convert the 3.3V voltage output by the GPIO port into a 6V voltage, thereby controlling the first LED indicator LED1 to be off.

[0054] It can be seen that the indicator light control circuit can control the first LED indicator light LED1 and the second LED indicator light LED2 to light up respectively through a single GPIO port of the control unit 20, that is, one GPIO signal.

[0055] If the above-mentioned indicator light control circuit is required to realize the scenario of lighting up the first LED indicator light LED1 and the second LED indicator light LED2 together, or lighting up only the first LED indicator light LED1, it can be achieved by selectively changing the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6.

[0056] For example, the resistance of the fifth resistor R5 is set to 330 ohms, the resistance of the sixth resistor R6 is set to 2 k ohms, and the ratio of the resistance of the fifth resistor R5 to the resistance of the sixth resistor R6 is approximately 1:6. At this time, the situation where the GPIO port of the control unit 10 outputs the first level signal (low level signal, 0 V) remains unchanged, and only the first LED indicator LED1 is still lit, and the second LED indicator LED2 is not lit. When the GPIO port of the control unit 10 outputs the second level signal (high level signal, 3.3 V), the NMOS transistor Q1 is turned off, the voltage between the first connection point D1 and the ground is the voltage applied to the fourth resistor R4 by the second power supply PS2, which is 6 V, and the second LED indicator LED2 is lit. Moreover, the voltage between the second end of the first resistor R1, i.e., the second connection point D2, and the first connection point D1 is approximately 4 V, which is greater than the forward conduction voltage of the first LED indicator LED1, 3.2 V, and the first LED indicator LED1 is also lit.

[0057] It can be seen that, by simply adjusting the resistance values of the fifth resistor R5 and the sixth resistor R6 (in fact, only the resistance value of the sixth resistor R6 is adjusted), the indicator light control circuit of the present invention can realize two different modes of controlling the first LED indicator light LED1 and the second LED indicator light LED2.

[0058] The utility model also provides a computer mainboard, which comprises the indicator light control circuit.

[0059] In one embodiment, the NMOS transistor Q1 may be a MOS transistor of model LBSS139WT1G. In one embodiment, the control unit 10 may be an embedded controller, and the embedded controller may be an embedded controller of the IT8637, IT8528, or other series.

[0060] To sum up, the indicator light control circuit of the present invention and the computer motherboard with the indicator light control circuit can control two LED indicator lights through a single GPIO port of the control unit, that is, one GPIO signal, to ensure the realization of the respective functions of the two LED indicator lights, thereby saving the use of the GPIO port of the control unit; moreover, the indicator light control circuit of the present invention can also realize different ways of controlling the two LED indicator lights through simple resistance and / or power supply adjustment as needed, so as to be suitable for different usage scenarios of the LED indicator lights, for example, the scenario of lighting up the two LED indicator lights separately, or the scenario of lighting up the two LED indicator lights together and lighting up only one of the LED indicator lights, thereby enriching its application.

[0061] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical solution and technical concept of the utility model, and all these changes and modifications should fall within the scope of protection of the claims of the utility model.

Claims

1. An indicator light control circuit, comprising a control unit, a first LED indicator light, and a second LED indicator light, wherein the control unit comprises a GPIO port, characterized in that: The indicator light control circuit also includes a first resistor, a second resistor, a third resistor, a fourth resistor, a switch unit, a first power supply and a second power supply, wherein the cathode of the first LED indicator light is connected to the anode of the second LED indicator light, and the connection point is a first connection point; the first end of the first resistor is connected to the anode of the first LED indicator light, and the second end of the first resistor is used to receive the voltage applied by the first power supply; the first end of the second resistor is connected to the cathode of the second LED indicator light, and the second end of the second resistor is grounded; the third resistor is connected between the second power supply and the first connection point; the fourth resistor is connected between the first connection point and the ground; the switch unit is connected between the GPIO port of the control unit and the first connection point, and the switch unit is turned on and outputs a low-level signal to the first connection point when receiving a first-level signal output by the GPIO port, and is turned off when receiving a second-level signal output by the GPIO port.

2. The indicator light control circuit according to claim 1, characterized in that: When the switch unit is closed, the voltage between the second end of the first resistor and the first connection point is less than the forward conduction voltage of the first LED indicator, and the voltage between the first connection point and the ground is greater than the forward conduction voltage of the second LED indicator; when the switch unit is turned on, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator.

3. The indicator light control circuit according to claim 1, characterized in that: When the switch unit is closed, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator, and the voltage between the first connection point and the ground is greater than the forward conduction voltage of the second LED indicator; when the switch unit is turned on, the voltage between the second end of the first resistor and the first connection point is greater than the forward conduction voltage of the first LED indicator.

4. The indicator light control circuit according to claim 1, characterized in that: The switching unit includes an NMOS tube, the gate of the NMOS tube is connected to the third power supply, the source of the NMOS tube is connected to the GPIO port of the control unit, the drain of the NMOS tube is connected to the first connection point, the first level signal is a low level signal, and the second level signal is a high level signal.

5. The indicator light control circuit according to claim 4, characterized in that: The output voltage of the third power supply is 3.3V, the control unit is an embedded controller, and the second level signal is 3.3V.

6. The indicator light control circuit according to any one of claims 1 to 5, characterized in that: The indicator light control circuit also includes a fifth resistor and a sixth resistor, the first end of the fifth resistor is connected to the first power supply; the second end of the fifth resistor, the first end of the sixth resistor and the second end of the first resistor are connected; the second end of the sixth resistor is grounded.

7. The indicator light control circuit according to claim 6, characterized in that: The output voltage of the first power supply is 12V, and the output voltage of the second power supply is 12V.

8. The indicator light control circuit according to claim 1, characterized in that: The indicator light control circuit further includes a seventh resistor and a fourth power supply, and the seventh resistor is connected between the fourth power supply and the GPIO port of the control unit.

9. The indicator light control circuit according to claim 8, characterized in that: The output voltage of the fourth power supply is 3.3V.

10. A computer mainboard comprising the indicator light control circuit according to any one of claims 1 to 9.

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