Fan working state indicating lamp control circuit

Abstract

The utility model provides a fan working state indicating lamp control circuit. The fan working state indicating lamp control circuit comprises a fan connector used for being connected with a fan, a control unit, a first driving unit and a second driving unit. When the control unit outputs a first level signal to the control end of the first driving unit through a GPIO interface, the first driving unit outputs a high level signal to a first indicator light signal pin of the fan connector and the control end of the second driving unit, so that the output end of the second driving unit is in a direct grounding state; when the control unit outputs a second level signal to the control end of the first driving unit through the GPIO interface, the output end of the first driving unit is in a direct grounding state, and the second driving unit outputs a high level signal to a second indicator light signal pin of the fan connector. The two working state indicating lamps of the fan can be controlled through one path of GPIO signals of the control unit, and meanwhile the situation that the two working state indicating lamps are turned on at the same time in the state conversion process is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic technical field especially relates to a fan working state indicating lamp control circuit. BACKGROUND

[0002] The working temperature of electronic equipment (such as computer) directly determines its service life and running stability, and electronic equipment will generate a large amount of heat in the running process, therefore, to keep the working temperature of each part of electronic equipment in reasonable range, in addition to ensuring that the temperature of its working environment is in reasonable range, it must be cooled in time, that is, through the heat dissipation device, the heat generated inside electronic equipment is continuously transferred to external environment to ensure that the temperature inside equipment is in safe range. Fan is such a heat dissipation device commonly used in electronic equipment for heat dissipation.

[0003] Because the internal heat of electronic equipment needs to be transferred in time to ensure that electronic equipment works normally, therefore, it is particularly important for fan to keep normal working state. Fan is usually provided with two working state indicating lamps to indicate the working state of fan, one is used to indicate that fan works normally, and the other is used to indicate that fan speed, power supply and the like have problems, fan does not work normally, and needs to be maintained or replaced, for example, green indicating lamp can be used to indicate that fan works normally, and red indicating lamp is used to indicate that fan does not work normally. The two working state indicating lamps are controlled by control unit according to the working state of fan, specifically, control unit usually controls two working state indicating lamps through two GPIO (General Purpose Input / Output, general purpose input / output) interfaces, that is to say, one working state indicating lamp is controlled through one GPIO signal.

[0004] However, as the functions of electronic devices are continuously increasing, the GPIO interface resources of the control unit are insufficient, and the use of two GPIO signals to control the working state indicator light of the fan causes waste of the GPIO interface of the control unit. More importantly, due to the influence of the parasitic capacitance of the working state indicator light of the fan, when the control unit controls the state conversion of the two working state indicator lights of the fan through the transformation of the two GPIO signals, the two working state indicator lights may emit light at the same time. Specifically, due to the large parasitic capacitance of the working state indicator light of the fan, when the two working state indicator lights are in state conversion, the indicator light in the light-emitting state first does not convert to the extinguishing state in time due to the energy storage effect of the parasitic capacitance, but will be bright for a few milliseconds, and thus will emit light at the same time with the indicator light in the light-emitting state second.

[0005] Therefore, how to reduce the control signal of the working state indicator light of the fan and avoid the simultaneous lighting of the two working state indicator lights of the fan during state conversion is a technical problem to be solved. SUMMARY

[0006] The utility model discloses a kind of fan working state indicator light control circuits, can control the two working state indicator lights of fan by the GPIO signal of control unit, simultaneously avoid the simultaneous lighting of the two working state indicator lights of fan during state conversion.

[0007] In order to achieve the above object, the utility model provides a fan working state indicator lamp control circuit, including fan connector for connecting fan, fan connector has first indicator lamp signal pin and second indicator lamp signal pin, first indicator lamp signal pin is used for providing first indicator lamp signal for first working state indicator lamp of fan to drive first working state indicator lamp emit light, second indicator lamp signal pin is used for providing second indicator lamp signal for second working state indicator lamp of fan to drive second working state indicator lamp emit light, fan working state indicator lamp control circuit still includes control unit, first drive unit and second drive unit, control unit includes a GPIO interface, the control end of first drive unit is connected to GPIO interface, the output of first drive unit is connected to first indicator lamp signal pin and the control end of second drive unit, the output of second drive unit is connected to second indicator lamp signal pin, wherein, when the control unit is through the GPIO interface and exports first level signal to the control end of first drive unit, the output of first drive unit exports high level signal to first indicator lamp signal pin, as first indicator lamp signal, simultaneously exports high level signal to the control end of second drive unit to make the output of second drive unit be direct ground state, when the control unit is through the GPIO interface and exports second level signal to the control end of first drive unit, the output of first drive unit is direct ground state, the output of second drive unit exports high level signal to second indicator lamp signal pin, as second indicator lamp signal.

[0008] Preferably, the first drive unit includes a first field effect transistor, the gate of the first field effect transistor as the control end of the first drive unit, the drain of the first field effect transistor as the output of the first drive unit; the second drive unit includes a second field effect transistor, the gate of the second field effect transistor as the control end of the second drive unit, the drain of the second field effect transistor as the output of the second drive unit.

[0009] Preferably, the first field effect transistor is a first NMOS transistor, and the second field effect transistor is a second NMOS transistor; the first driving unit further comprises a first resistor and a second resistor, and the second driving unit further comprises a third resistor and a fourth resistor, wherein the gate of the first NMOS transistor is connected to the GPIO interface and connected to a first power supply through the first resistor, the drain of the first NMOS transistor is connected to the first indicator light signal pin, the gate of the second NMOS transistor, and the first power supply through the second resistor, and the source of the first NMOS transistor is grounded; the gate of the second NMOS transistor is further connected to a second power supply through the third resistor, the drain of the second NMOS transistor is connected to the second indicator light signal pin and the second power supply through the fourth resistor, and the source of the second NMOS transistor is grounded.

[0010] Preferably, the first power supply and the second power supply are the same power supply.

[0011] Preferably, the first level signal is a low level signal, and the second level signal is a high level signal.

[0012] Preferably, the fan connector is a double-rotor fan connector.

[0013] Preferably, the fan connector further has a first rotation speed feedback pin and a second rotation speed feedback pin, and the control unit further comprises a first rotation speed detection interface and a second rotation speed detection interface, wherein the first rotation speed feedback pin is connected to the first rotation speed detection interface through a first signal conversion unit, and the second rotation speed feedback pin is connected to the second rotation speed detection interface through a second signal conversion unit.

[0014] Preferably, the first signal conversion unit comprises a third NMOS transistor and a fifth resistor, wherein the gate of the third NMOS transistor is connected to the first rotation speed feedback pin, the drain of the third NMOS transistor is connected to the first rotation speed detection interface and connected to a third power supply through the fifth resistor, and the source of the third NMOS transistor is grounded; and the second signal conversion unit comprises a fourth NMOS transistor and a sixth resistor, wherein the gate of the fourth NMOS transistor is connected to the second rotation speed feedback pin, the drain of the fourth NMOS transistor is connected to the second rotation speed detection interface and connected to the third power supply through the sixth resistor, and the source of the fourth NMOS transistor is grounded.

[0015] Preferably, the fan connector further has a rotating speed control pin, and the control unit further comprises a PWM signal output interface connected to the rotating speed control pin through a seventh resistor and connected to a third power supply through an eighth resistor, the rotating speed control pin is further connected to an anode of a diode, a cathode of the diode is connected to a fourth power supply, and the fourth power supply is further connected to the power supply pin of the fan connector.

[0016] Preferably, the control unit is an embedded controller.

[0017] The fan working state indicator lamp control circuit of the utility model has the advantages that through the setting of the first driving unit and the second driving unit, the fan working state indicator lamp control circuit can realize the control of the two working state indicator lamps of the fan by using only one GPIO interface of the control unit, namely, the control signal can be provided for the two indicator lamp signal pins of the fan connector, the realization of the respective functions of the two working state indicator lamps is ensured, and the use of the GPIO interface of the control unit is saved; and through the setting of the first driving unit and the second driving unit, when the working state indicator lamp in the extinguished state is converted into the light-emitting state, the working state indicator lamp in the light-emitting state in advance is converted into the extinguished state in time by accelerating the discharging speed due to the conversion of the corresponding indicator lamp signal pin from receiving the high-level signal into being directly grounded, so that the two working state indicator lamps of the fan are prevented from being lighted at the same time in the state conversion process. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Figure 1 It is a structural schematic view of the fan working state indicator lamp control circuit of the utility model.

[0020] Figure 2 It is a circuit wiring diagram of the first driving unit and the second driving unit of the fan working state indicator lamp control circuit of the utility model embodiment.

[0021] Figure 3 It is a partial circuit wiring diagram of the fan connector of the fan working state indicator lamp control circuit of the utility model embodiment. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects of the utility model, the following describes the preferred embodiments of the utility model and the drawings thereof.

[0023] The utility model provides a fan working state indicator lamp control circuit, can control two working state indicator lamps of fan through one way GPIO signal of control unit, avoid two working state indicator lamps of fan in state conversion process bright light simultaneously simultaneously.

[0024] As Figure 1 The utility model discloses a fan working state indicator lamp control circuit 10, including the fan connector 11 for connecting fan 20, control unit 12, first drive unit 13 and second drive unit 14.

[0025] The fan connector 11 is used for connecting fan 20 and has a first indicator lamp signal pin 111 and a second indicator lamp signal pin 112. The first indicator lamp signal pin 111 is used to provide a first indicator lamp signal for the first working state indicator lamp 21 of the fan 20 to drive the first working state indicator lamp 21 to emit light. The second indicator lamp signal pin 112 is used to provide a second indicator lamp signal for the second working state indicator lamp 22 of the fan 20 to drive the second working state indicator lamp 22 to emit light.

[0026] The control unit 12 includes a GPIO interface. The control end of the first drive unit 13 is connected to the GPIO interface, the output end of the first drive unit 13 is connected to the first indicator lamp signal pin 111 and the control end of the second drive unit 14, and the output end of the second drive unit 14 is connected to the second indicator lamp signal pin 112. When the control unit 12 outputs a first level signal to the control end of the first drive unit 13 through the GPIO interface, the output end of the first drive unit 13 outputs a high-level signal to the first indicator lamp signal pin 111 as the first indicator lamp signal, and simultaneously outputs a high-level signal to the control end of the second drive unit 14 to make the output end of the second drive unit 14 in a direct grounding state. When the control unit 12 outputs a second level signal to the control end of the first drive unit 13 through the GPIO interface, the output end of the first drive unit 13 is in a direct grounding state, and the output end of the second drive unit 14 outputs a high-level signal to the second indicator lamp signal pin 112 as the second indicator lamp signal.

[0027] Specifically, when the control unit 12 outputs a first level signal to the control end of the first drive unit 13 through the GPIO interface, the output end of the first drive unit 13 outputs a high level signal to the first indicator lamp signal pin 111, and the first working state indicator lamp 21 of the fan 20 can be driven to emit light. At this time, the output end of the second drive unit 14 is in a direct grounding state, that is, the second indicator lamp signal pin 112 receives a low level signal, and the second working state indicator lamp 22 of the fan 20 does not emit light. When the control unit 12 outputs a second level signal to the control end of the first drive unit 13 through the GPIO interface, the output end of the first drive unit 13 is in a direct grounding state, that is, the first indicator lamp signal pin 111 receives a low level signal, and the first working state indicator lamp 21 of the fan 20 does not emit light. At the same time, the control end of the second drive unit 14 receives a low level signal, so that the output end of the second drive unit 14 outputs a high level signal to the second indicator lamp signal pin 112, and the second working state indicator lamp 22 of the fan 20 can be driven to emit light.

[0028] Therefore, the fan working state indicator lamp control circuit 10 provided by the utility model can realize the use of only one GPIO interface of the control unit 12, that is, the first indicator lamp signal pin 111 and the second indicator lamp signal pin 112 can be provided with control signals to control the two working state indicator lamps 21 and 22 of the fan 20, ensure the realization of the functions of the two working state indicator lamps 21 and 22, and thus save the use of the GPIO interface of the control unit 12.

[0029] Further, when the control unit 12 controls the first working state indicator lamp 21 and the second working state indicator lamp 22 to change state according to the running state of the fan 20, for example, if the first working state indicator lamp 21 emits light to indicate that the fan 20 is in a normal working state and the second working state indicator lamp 22 emits light to indicate that the fan 20 is in an abnormal working state, when the control unit 12 changes from outputting a high-level signal (first indicator lamp signal) to the first indicator lamp signal pin 111 to control the first working state indicator lamp 21 to emit light to outputting a high-level signal (second indicator lamp signal) to the second indicator lamp signal pin 112 to control the second working state indicator lamp 22 to emit light, the GPIO interface of the control unit 12 changes from outputting a first-level signal to outputting a second-level signal, and the output end of the first driving unit 13 changes from outputting a high-level signal to a direct grounding state, that is, the first indicator lamp signal pin 111 changes from receiving a high-level signal to direct grounding, so that the discharging speed of the first working state indicator lamp 21 can be accelerated, thereby prompting it to change to an extinguished state in time, and at the same time, the output end of the second driving unit 14 changes from a direct grounding state to outputting a high-level signal to the second indicator lamp signal pin 112 to drive the second working state indicator lamp 22 of the fan 20 to emit light, so that the two working state indicator lamps 21 and 22 of the fan 20 can be prevented from emitting light at the same time during state change.

[0030] Further, the first driving unit 13 can include a first field effect transistor, the gate of the first field effect transistor serving as the control end of the first driving unit 13, and the drain of the first field effect transistor serving as the output end of the first driving unit; and the second driving unit 14 can include a second field effect transistor, the gate of the second field effect transistor serving as the control end of the second driving unit 14, and the drain of the second field effect transistor serving as the output end of the second driving unit 14.

[0031] In a preferred embodiment, the first field effect transistor and the second field effect transistor can both be NMOS tubes. Specifically, as shown in Figure 2 FIG. 1 is a circuit wiring diagram of a fan working state indicator lamp control circuit 10 according to an embodiment of the present application.

[0032] Figure 2In one embodiment, the first driving unit 13 includes a first field-effect transistor, which is a first NMOS transistor Q1; the second driving unit 14 includes a second field-effect transistor, which is a second NMOS transistor Q2. Further, the first driving unit 13 also includes a first resistor R1 and a second resistor R2; the second driving unit 14 also includes a third resistor R3 and a fourth resistor R4. The gate of the first NMOS transistor Q1 is connected to the GPIO interface of the control unit 12 and is connected to a first power supply PS1 via the first resistor R1. The drain of the first NMOS transistor Q1 is connected to the first indicator light signal pin 111 of the fan connector 11, the gate of the second NMOS transistor Q2, and is connected to the first power supply PS1 via the second resistor R2. The source of the first NMOS transistor Q1 is grounded. The gate of the second NMOS transistor Q2 is also connected to a second power supply PS2 via the third resistor R3. The drain of the second NMOS transistor Q2 is connected to the second indicator light signal pin 112 of the fan connector 11 and is connected to the second power supply PS2 via the fourth resistor R4. The source of the second NMOS transistor Q2 is grounded.

[0033] In this embodiment, the first level signal output by the GPIO interface of the control unit 12 is a low level signal, and the second level signal is a high level signal.

[0034] Thus, when the GPIO interface of the control unit 12 outputs a low-level signal ( Figure 2 When the FAN_LED_ACT signal is low, the first NMOS transistor Q1 is turned off when the gate of the first NMOS transistor Q1 is reached. The drain of the first NMOS transistor Q1 outputs a high-level signal to the first indicator light signal pin 111. Figure 2 The FAN_LED_G signal is a high-level signal) and the gate of the second NMOS transistor Q2 is turned on. The drain of the second NMOS transistor Q2 is directly grounded, that is, the second indicator signal pin 112 receives a low-level signal ( Figure 2 The FAN_LED_R signal is low. When the GPIO interface of the control unit 12 outputs a high-level signal ( Figure 2 When the FAN_LED_ACT signal is high, the first NMOS transistor Q1 is turned on, and its drain is directly grounded. The first indicator light signal pin 111 receives a low-level signal. Figure 2When the FAN_LED_G signal is a low level signal, the first NMOS tube Q1 is turned off, and the drain of the first NMOS tube Q1 outputs a high level signal to the second indicator light signal pin 112 (the second NMOS tube Q2 is turned on, and the drain of the second NMOS tube Q2 outputs a low level signal to the first indicator light signal pin 111 Figure 2 When the FAN_LED_R signal is a high level signal.

[0035] Through the arrangement of the first driving unit 13 and the second driving unit 14, the utility model not only can realize that only a single GPIO interface of the control unit 12 is used to provide control signals for the first indicator light signal pin 111 and the second indicator light signal pin 112, to control two working state indicator lights 21 and 22 of the fan 20, ensure the realization of the respective functions of the two working state indicator lights 21 and 22, to save the use of the GPIO interface of the control unit 12, but also when control conversion is carried out, the drain of the first NMOS tube Q1 or the second NMOS tube Q2 can be converted from outputting a high level signal to being directly grounded, and the signal level of the first indicator light signal pin 111 or the second indicator light signal pin 112 is directly pulled from a high level to a low level (0V), to accelerate the speed of extinguishing the corresponding working state indicator light 21 or 22, and avoid the situation that the two working state indicator lights 21 and 22 of the fan 20 are simultaneously lighted in the state conversion process.

[0036] In an embodiment, the first power supply PS1 and the second power supply PS2 are the same power supply, such as a mainboard P3V3 power supply.

[0037] In the above embodiment, the first driving unit 13 and the first driving unit 14 both use NMOS tubes to realize their functions, but the first driving unit 13 and the first driving unit 14 are not limited to this, and can also use PMOS tubes or transistors or the combination of NMOS tubes and transistors, and corresponding circuit adjustment is carried out, to achieve the same technical effect, and at the same time, the first level signal and the second level signal can also be adjusted accordingly.

[0038] Further, in a preferred embodiment, the fan connector 11 is a double rotor fan connector, used for connecting a double rotor fan. Figure 3 As shown in the figure, the fan connector 11 of the fan working state indicator light control circuit 10 of an embodiment of the utility model is a partial circuit wiring diagram when the double rotor fan connector FAN1 is used.

[0039] Figure 3 As shown in the embodiment, the double rotor fan connector FAN1 is used for connecting a fan 20 ( Figure 3The dual-rotor fan connector FAN1 has a first indicator signal pin 6 for providing a first indicator signal to the first working state indicator 21 of the fan 20 and a second indicator signal pin 8 for providing a second indicator signal to the second working state indicator 22 of the fan 20. Please refer to Figure 2 The first indicator signal pin 6 can be connected to the output end of the first driving unit 13, i.e. the drain of the first NMOS Q1, to receive the FAN_LED_G signal output therefrom; the second indicator signal pin 8 can be connected to the output end of the second driving unit 14, i.e. the drain of the second NMOS Q2, to receive the FAN_LED_R signal output therefrom. The dual-rotor fan connector FAN1 provides the FAN_LED_G signal to the first working state indicator 21 and the FAN_LED_R signal to the second working state indicator 22 of the fan 20 under the control of the control unit 12 to control the light emitting or extinguishing process thereof as described above, which will not be repeated here.

[0040] The dual-rotor fan connector FAN1 also has a first speed feedback pin 2 and a second speed feedback pin 4. Correspondingly, the control unit 12 can include a first speed detection interface and a second speed detection interface. The first speed feedback pin 2 is connected to the first speed detection interface through a first signal conversion unit 113 for feeding back the first rotor speed detection signal SYSTEM_FANTACH_R of the dual-rotor fan connector FAN1 to the control unit 12; the second speed feedback pin 4 is connected to the second speed detection interface through a second signal conversion unit 114 for feeding back the second rotor speed detection signal SYSTEM_FANTACH2_R of the dual-rotor fan connector FAN1 to the control unit 12. The control unit 12 can determine the working state of the first working state indicator 21 and the second working state indicator 22 according to the received first rotor speed detection signal SYSTEM_FANTACH_R and second rotor speed detection signal SYSTEM_FANTACH2_R.

[0041] Specifically, the first signal conversion unit 113 can include a third NMOS tube Q3 and a fifth resistor R5, a gate of the third NMOS tube Q3 is connected to the first speed feedback pin 2, a drain of the third NMOS tube Q3 is connected to the first speed detection interface and connected to a third power supply PS3 through the fifth resistor R5, and a source of the third NMOS tube Q3 is grounded; the second signal conversion unit 114 includes a fourth NMOS tube Q4 and a sixth resistor R6, a gate of the fourth NMOS tube Q4 is connected to the second speed feedback pin 4, a drain of the fourth NMOS tube Q4 is connected to the second speed detection interface and connected to the third power supply PS3 through the sixth resistor R6, and a source of the fourth NMOS tube Q4 is grounded.

[0042] When the first speed feedback pin 2 outputs a low-level speed detection signal SYSTEM_FANTACH_R, the third NMOS tube Q3 is turned off, and the first signal conversion unit 113 outputs a high-level SYSTEM_TACH signal to the control unit 12; when the first speed feedback pin 2 outputs a high-level speed detection signal SYSTEM_FANTACH_R, the third NMOS tube Q3 is turned on, and the first signal conversion unit 113 outputs a low-level SYSTEM_TACH signal to the control unit 12.

[0043] When the second speed feedback pin 4 outputs a low-level speed detection signal SYSTEM_FANTACH2_R, the fourth NMOS tube Q4 is turned off, and the second signal conversion unit 114 outputs a high-level SYSTEM_TACH2 signal to the control unit 12; when the second speed feedback pin 4 outputs a high-level speed detection signal SYSTEM_FANTACH2_R, the fourth NMOS tube Q4 is turned on, and the second signal conversion unit 114 outputs a low-level SYSTEM_TACH2 signal to the control unit 12.

[0044] Through the setting of the third NMOS tube Q3 and the fourth NMOS tube Q4, isolation can be formed between the first speed feedback pin 2, the second speed feedback pin 4 and the control unit 12. Once fan hot plug occurs, the high voltage generated on the first speed feedback pin 2 and the second speed feedback pin 4 of the double-rotor fan connector FAN1 will not be loaded to the control unit 12 due to the isolation effect of the third NMOS tube Q3 and the fourth NMOS tube Q4, thereby protecting the control unit 12.

[0045] Further, the dual-rotor fan connector FAN1 also has a rotating speed control pin 5. Accordingly, the control unit 12 also comprises a PWM signal output interface. The PWM signal output interface is connected to the rotating speed control pin 5 through a seventh resistor R7 and connected to a third power supply PS3 through an eighth resistor R8. The rotating speed control pin 5 is also connected to an anode of a diode D1, and a cathode of the diode D1 is connected to a fourth power supply PS4. The fourth power supply PS4 is also connected to power supply pins 1, 3 of the dual-rotor fan connector FAN1 to supply power to the fan 20.

[0046] The control unit 12 outputs a PWM signal SYSTEM_PWM to the dual-rotor fan connector FAN1 through the PWM signal output interface to control the fan 20 to operate. The seventh resistor R7 and the diode D1 can also form a hot plug protection circuit of the fan 20. Once fan hot plug occurs, a high voltage is generated on the rotating speed control pin 5. The high voltage is first conducted to a power supply copper foil of the fourth power supply PS4 through the diode D1, and then when passing through the seventh resistor R7, the seventh resistor R7 functions as a current limiting resistor to limit the current to a small amplitude, thereby protecting the control unit 12 from being damaged by a large current on the rotating speed control pin 5.

[0047] Here, the third power supply PS3 can be a mainboard P3V3 power supply, and the fourth power supply PS4 can be a mainboard P12V power supply. Since the fourth power supply PS4 is a 12V power supply, its power supply copper foil is large and can withstand a high voltage.

[0048] The dual-rotor fan connector FAN1 also has ground pins 7, 9 for grounding.

[0049] In an embodiment, the control unit 12 is an embedded controller (EC), which can be of model IT8637E, but is not limited thereto. In an embodiment, the NMOS tubes Q1, Q2, Q3, Q4 can be MOS tubes of model L2N7002WT1G, but are not limited thereto.

[0050] In summary, the fan working state indicator lamp control circuit through the setting of the first driving unit and the second driving unit can realize only using one GPIO interface of the control unit, that is, can provide control signals for two indicator lamp signal pins of the fan connector, to control two working state indicator lamps of the fan, ensure the realization of respective functions of the two working state indicator lamps, thereby saving the use of the GPIO interface of the control unit; moreover, the fan working state indicator lamp control circuit through the setting of the first driving unit and the second driving unit can, in the process of the control unit converting the states of the two working state indicator lamps of the fan, when converting the working state indicator lamp in the extinguished state to the light-emitting state, make the working state indicator lamp in the light-emitting state first accelerate the discharging speed by converting the corresponding indicator lamp signal pin from receiving the high-level signal to being directly grounded, so as to timely convert to the extinguished state, thereby avoiding the two working state indicator lamps of the fan from lighting up at the same time in the state conversion process.

[0051] The above description is for the ordinary skilled in the art to make other various corresponding changes and deformations according to the technical scheme and technical concept of the utility model, and all these changes and deformations shall belong to the protection scope of the utility model claim.

Claims

1. A fan operating status indicator light control circuit, comprising a fan connector for connecting a fan, the fan connector having a first indicator light signal pin for providing a first indicator light signal to a first operating status indicator light of the fan to drive the first operating status indicator light to emit light, and a second indicator light signal pin for providing a second indicator light signal to a second operating status indicator light of the fan to drive the second operating status indicator light to emit light, characterized in that, The fan working state indicator lamp control circuit further comprises a control unit, a first driving unit and a second driving unit, the control unit comprises a GPIO interface, the control end of the first driving unit is connected to the GPIO interface, the output end of the first driving unit is connected to the first indicator lamp signal pin and the control end of the second driving unit, and the output end of the second driving unit is connected to the second indicator lamp signal pin, wherein when the control unit outputs a first level signal to the control end of the first driving unit through the GPIO interface, the output end of the first driving unit outputs a high level signal to the first indicator lamp signal pin as the first indicator lamp signal, and outputs a high level signal to the control end of the second driving unit so that the output end of the second driving unit is in a direct grounding state; when the control unit outputs a second level signal to the control end of the first driving unit through the GPIO interface, the output end of the first driving unit is in a direct grounding state, and the output end of the second driving unit outputs a high level signal to the second indicator lamp signal pin as the second indicator lamp signal.

2. The fan status indicator control circuit of claim 1, wherein, The first driving unit comprises a first field effect transistor, the gate of the first field effect transistor serves as the control end of the first driving unit, and the drain of the first field effect transistor serves as the output end of the first driving unit; the second driving unit comprises a second field effect transistor, the gate of the second field effect transistor serves as the control end of the second driving unit, and the drain of the second field effect transistor serves as the output end of the second driving unit.

3. The fan status indicator light control circuit of claim 2, wherein, The first field effect transistor is a first NMOS tube, and the second field effect transistor is a second NMOS tube; the first driving unit further comprises a first resistor and a second resistor, and the second driving unit further comprises a third resistor and a fourth resistor, wherein the gate of the first NMOS tube is connected to the GPIO interface and connected to a first power supply through the first resistor, the drain of the first NMOS tube is connected to the first indicator lamp signal pin, the gate of the second NMOS tube and connected to the first power supply through the second resistor, and the source of the first NMOS tube is grounded; the gate of the second NMOS tube is further connected to a second power supply through the third resistor, the drain of the second NMOS tube is connected to the second indicator lamp signal pin and connected to the second power supply through the fourth resistor, and the source of the second NMOS tube is grounded.

4. The fan status indicator light control circuit of claim 3, wherein, The first power supply and the second power supply are the same power supply.

5. The fan status indicator light control circuit of claim 1, 2, or 3, wherein, The first level signal is a low level signal, and the second level signal is a high level signal.

6. The fan status indicator control circuit of claim 1, wherein, The fan connector is a double-rotor fan connector.

7. The fan status indicator light control circuit of claim 6, wherein, The fan connector further has a first rotation speed feedback pin and a second rotation speed feedback pin, and the control unit further comprises a first rotation speed detection interface and a second rotation speed detection interface, the first rotation speed feedback pin is connected to the first rotation speed detection interface through a first signal conversion unit, and the second rotation speed feedback pin is connected to the second rotation speed detection interface through a second signal conversion unit.

8. The fan status indicator light control circuit of claim 7, wherein, The first signal conversion unit comprises a third NMOS tube and a fifth resistor, the gate of the third NMOS tube is connected to the first rotation speed feedback pin, the drain of the third NMOS tube is connected to the first rotation speed detection interface and to a third power supply through the fifth resistor, and the source of the third NMOS tube is grounded; and the second signal conversion unit comprises a fourth NMOS tube and a sixth resistor, the gate of the fourth NMOS tube is connected to the second rotation speed feedback pin, the drain of the fourth NMOS tube is connected to the second rotation speed detection interface and to the third power supply through the sixth resistor, and the source of the fourth NMOS tube is grounded.

9. The fan status indicator light control circuit of claim 6, wherein, The fan connector further has a rotation speed control pin, and the control unit further comprises a PWM signal output interface, the PWM signal output interface is connected to the rotation speed control pin through a seventh resistor and to a third power supply through an eighth resistor, the rotation speed control pin is further connected to the anode of a diode, the cathode of the diode is connected to a fourth power supply, and the fourth power supply is further connected to the power supply pin of the fan connector.

10. The fan status indicator control circuit of claim 1, wherein, The control unit is an embedded controller.

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