Fan control system, server system, and fan control method and apparatus

Abstract

A fan control system, a server system, and a fan control method and apparatus. The fan control system comprises a measurement circuit and a delay circuit, the measurement circuit acquiring a first voltage of an alternating current power supply and / or a second voltage output by a power supply unit during rotating of a fan; when the first voltage and / or the second voltage drops, a mainboard stops outputting a closing signal to the delay circuit, such that an energy storage unit discharges within a preset time, the delay circuit being provided between an output end of the mainboard and an enabling end of an overcurrent protection switch, and the delay time of the delay circuit being the preset time. The mainboard is used for outputting, when the server system satisfies a preset cooling condition, the closing signal to the overcurrent protection switch by means of the delay circuit. By means of the delay circuit, the fan control system can prevent a fan controller from performing closed-loop control on the rotating speed of the fan, thereby avoiding fan stopping caused by disconnection of the overcurrent protection switch.

Description

Fan control system, server system, fan control method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on July 26, 2023, with application number 202310922112.1, and application name “Fan Control System, Server System, Fan Control Method and Device”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of server security protection, and in particular to a fan control system, a server system, a fan control method and a fan control device. Background Art

[0004] In a server system, AC power is input to the PSU (Power Supply Unit), which converts the AC power into DC power to power the motherboard and fans in the server system. When the voltage of the AC power drops, the DC voltage output by the PSU will also drop, resulting in insufficient power supply to the fan and a reduction in the fan speed. When the fan speed drops rapidly, the fan controller will perform closed-loop control on the fan speed, thereby increasing the duty cycle of the PWM (pulse width modulation) signal, causing a large impulse current, which may trigger the fan's overcurrent protection switch, causing the fan to stop. The inventors realized that when the AC power and PSU resume normal power supply, the motherboard and other components in the server system will continue to work, but because the fan stops, the temperature of key components may overheat, posing a risk of damage.

[0005] Summary of the Invention

[0006] The present application provides a fan control system, a server system, a fan control method, and a device. A delay circuit can prevent the fan's overcurrent protection switch from being triggered, thereby preventing the fan from stalling due to the overcurrent protection switch being disconnected. This ensures that the fan can resume operation after the first voltage and the second voltage return to normal, thereby ensuring that key components in the server system maintain heat dissipation and avoiding the risk of damage due to overheating.

[0007] In a first aspect, the present application provides a fan control system, which is applied to a server system. The server system includes a power supply unit, a mainboard, an overcurrent protection switch, an energy storage unit, a fan controller, and a fan. The input end of the power supply unit inputs an AC power supply, the output end of the power supply unit is connected to the power end of the mainboard, and is connected to the power end of the energy storage unit, the power end of the fan controller, and the power end of the fan through the overcurrent protection switch. The output end of the mainboard is connected to the enable end of the overcurrent protection switch, and the fan controller is connected to the fan.

[0008] The fan control system includes:

[0009] a detection circuit, having an input end connected to the input end and / or the output end of the power supply unit, and an output end connected to the mainboard, for obtaining a first voltage of the AC power supply and / or a second voltage output by the power supply unit during fan rotation;

[0010] The delay circuit is provided between the output terminal of the mainboard and the enable terminal of the overcurrent protection switch, and the delay time of the delay circuit is a preset time;

[0011] The mainboard is used to output a closing signal to the overcurrent protection switch through a delay circuit when the server system meets the preset cooling conditions, so that the overcurrent protection switch is closed after a preset time; when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, stop outputting the closing signal to the delay circuit, so that the energy storage unit discharges within a preset time, so that the fan controller is powered off.

[0012] In some embodiments, the detection circuit is specifically configured to obtain a second voltage output by the power supply unit during fan rotation; the fan control system further includes:

[0013] The undervoltage detection circuit has an input end connected to the output end of the power supply unit and the power end of the fan controller respectively, and an output end connected to the reset end of the fan controller. The circuit is used to compare the second voltage output by the power supply unit with the threshold voltage of the fan controller, and when the second voltage is less than the threshold voltage, output a reset signal to the reset end of the fan controller to reset the fan controller, thereby triggering the fan controller to readjust the fan speed.

[0014] In some embodiments, the brown-out detection circuit includes:

[0015] A sampling circuit, the input end of which is connected to the power supply end of the fan controller, for obtaining the threshold voltage of the fan controller;

[0016] The comparison circuit has a first input end connected to the output end of the detection circuit, a second input end connected to the output end of the sampling circuit, and an output end connected to the reset end of the fan controller. The comparison circuit is used to output a reset signal to the reset end of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the fan speed.

[0017] In some embodiments, the comparison circuit is a comparator; the positive input terminal is connected to the output terminal of the detection circuit, the negative input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, and is configured to output a low-level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than a threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan;

[0018] Alternatively, the negative input terminal is connected to the output terminal of the detection circuit, the positive input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, so as to output a high-level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

[0019] In some embodiments, the sampling circuit includes a first resistor and a second resistor; one end of the first resistor is connected to the power supply end of the fan controller, the other end of the first resistor is connected to one end of the second resistor and serves as the output end of the sampling circuit, and the other end of the second resistor is grounded.

[0020] In some embodiments, when the detection circuit is specifically used to detect the second voltage of the power supply unit, the detection circuit includes a first resistor and a fourth resistor; one end of the third resistor is connected to the output end of the power supply unit, the other end of the third resistor is connected to one end of the fourth resistor and serves as the output end of the detection circuit, and the other end of the fourth resistor is grounded.

[0021] In some embodiments, the delay time of the delay circuit is determined according to the type of the fan controller and the type of the fan; and the preset time is not less than a preset multiple of the discharge time, and the discharge time is the time required for the power supply voltage of the fan controller to drop to the threshold voltage during the discharge of the energy storage unit.

[0022] In some embodiments, the energy storage unit is a capacitor.

[0023] In some embodiments, the delay circuit is a timer or a counter or an RC circuit.

[0024] In some embodiments, a filtering device is further included, which is provided between the output terminal connection of the detection circuit and the main board, and is used to filter the first voltage and / or the second voltage obtained by the detection circuit.

[0025] In some embodiments, a prompt device is further included, which is connected to the mainboard and is used to output a prompt message when it is determined that the first voltage drops to the first preset voltage and / or when it is determined that the second voltage drops to the second preset voltage.

[0026] In some embodiments, the prompt device is a sound prompt device and / or a display prompt device and / or a vibration prompt device.

[0027] In some embodiments, the mainboard is used to stop outputting a closing signal to the delay circuit when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so as to stop outputting a closing signal to the overcurrent protection switch by delaying the delay circuit for a preset time, so that the energy storage unit discharges within the preset time, thereby cutting off the power to the fan controller.

[0028] In a second aspect, the present application provides a server system, including a power supply unit, a mainboard, an overcurrent protection switch, an energy storage unit, a fan controller, a fan, and the fan control system as described above;

[0029] The input end of the power supply unit inputs AC power, the output end of the power supply unit is connected to the power end of the mainboard, and is connected to the power end of the energy storage unit, the power end of the fan controller and the power end of the fan through the overcurrent protection switch, the output end of the mainboard is connected to the enable end of the overcurrent protection switch, the fan controller is connected to the fan, the input end of the fan control system is connected to the input end and / or output end of the power supply unit, and the output end of the fan control system is connected to the fan controller.

[0030] In a third aspect, the present application further provides a fan control method, which is applied to the above-mentioned fan control system, and the method includes:

[0031] During the rotation of the fan, obtaining a first voltage of the AC power supply and / or a second voltage output by the power supply unit;

[0032] When the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

[0033] In some embodiments, further comprising:

[0034] When the preset cooling conditions are met, the control mainboard outputs a closing signal to the overcurrent protection switch, so that the overcurrent protection switch is closed for a preset delay time to start the fan.

[0035] In some embodiments, the server system further includes an electronic device to be cooled and connected to the mainboard, and further includes:

[0036] Determine whether the electronic device to be cooled is connected to the mainboard;

[0037] If so, it is determined that the preset cooling condition is met.

[0038] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so as to cause the energy storage unit to discharge for a preset time and thereby control the fan controller to power off, including:

[0039] When the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, the control mainboard stops outputting the closing signal to the delay circuit, so as to stop outputting the closing signal to the overcurrent protection switch by delaying the preset time through the delay circuit, so that the energy storage unit discharges within the preset time and thereby controls the fan controller to power off.

[0040] In some embodiments, further comprising:

[0041] When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the fan controller is reset to trigger the fan controller to readjust the speed of the fan.

[0042] In some embodiments, before resetting the fan controller to trigger the fan controller to re-regulate the fan speed, the method further includes:

[0043] determining whether the second voltage output by the power supply unit is less than a threshold voltage of the fan controller;

[0044] If it is less than, it is determined that the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, and the process enters the step of resetting the fan controller to trigger the fan controller to readjust the fan speed.

[0045] In some embodiments, the undervoltage monitoring circuit in the fan control system includes a sampling circuit and a comparison circuit for detecting a threshold voltage of the fan controller, the detection circuit is connected to a first input terminal of the comparison circuit, and the sampling circuit is connected to a second input terminal of the comparison circuit;

[0046] Determining whether the second voltage output by the power supply unit is less than a threshold voltage of the fan controller includes:

[0047] Comparing the voltage value of the first input terminal of the device with the comparison circuit to see whether it is smaller than the voltage value of the second input terminal;

[0048] If the voltage value of the first input terminal is less than the voltage value of the second input terminal, it is determined that the second voltage output by the power supply unit is less than the threshold voltage of the fan controller; otherwise, it is determined that the second voltage output by the power supply unit is not less than the threshold voltage of the fan controller.

[0049] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, resetting the fan controller to trigger the fan controller to readjust the fan speed includes:

[0050] When it is determined that the voltage value of the first input terminal is less than the voltage value of the second input terminal, the comparison circuit is triggered to output a reset signal to the fan controller to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

[0051] In some embodiments, after obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, the method further includes:

[0052] Determining whether a first difference between the first reference voltage and the first voltage is greater than a first threshold, and / or determining whether a second difference between the second reference voltage and the second voltage is greater than a second threshold;

[0053] If the first difference is greater than the first threshold, determining that the first voltage drops to a first preset voltage;

[0054] If the second difference is greater than the second threshold, it is determined that the second voltage drops to a second preset voltage.

[0055] In some embodiments, after obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, the method further includes:

[0056] Filtering is performed on the first voltage and / or the second voltage.

[0057] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so as to cause the energy storage unit to discharge for a preset time and thereby control the fan controller to power off, including:

[0058] Determining whether a duration of the first voltage dropping to a first preset voltage and / or the second voltage dropping to a second preset voltage reaches a time threshold;

[0059] If so, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for the preset time and then controls the fan controller to power off.

[0060] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so as to cause the energy storage unit to discharge for a preset time and thereby control the fan controller to power off, further comprising:

[0061] When the first voltage is restored and the second voltage is restored, the fan controller is controlled to be powered on again to restart the fan.

[0062] In some embodiments, when the first voltage is restored and the second voltage is restored, controlling the fan controller to power on again to restart the fan includes:

[0063] When the first voltage is restored and the second voltage is restored, the fan controller is controlled to be powered on again with a delay to restart the fan.

[0064] In a fourth aspect, the present application further provides a fan control device, which is applied to the above-mentioned fan control system, comprising:

[0065] a voltage acquisition unit, configured to acquire a first voltage of the AC power supply and / or a second voltage output by the power supply unit during the rotation of the fan;

[0066] The control unit is used to control the mainboard to continuously output a closing signal to the overcurrent protection switch for a preset time when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0068] Figure 1 is a block diagram of the server system;

[0069] FIG2 is a waveform diagram of a voltage drop according to one or more embodiments of the present application;

[0070] FIG3 is a schematic diagram of a general power supply structure of a fan provided in accordance with one or more embodiments of the present application;

[0071] FIG4 is a schematic diagram of internal power supply of a fan according to one or more embodiments of the present application;

[0072] FIG5 is a structural block diagram of a fan control system provided by the present application according to one or more embodiments;

[0073] FIG6 is a schematic diagram of an improved power supply structure of a fan provided in accordance with one or more embodiments of the present application;

[0074] FIG7 is a schematic diagram of an improved internal power supply of a fan according to one or more embodiments of the present application;

[0075] FIG8 is a structural block diagram of a server system provided by the present application according to one or more embodiments;

[0076] FIG9 is a flow chart of a fan control method according to one or more embodiments of the present application;

[0077] FIG10 is a structural block diagram of a fan control device provided in accordance with one or more embodiments of the present application;

[0078] FIG11 is a structural block diagram of a fan control device provided in accordance with one or more embodiments of the present application. DETAILED DESCRIPTION

[0079] The core of this application is to provide a fan control system, a server system, a fan control method and a device. Through a delay circuit, the triggering of the fan overcurrent protection switch can be avoided, thereby preventing the fan from stopping due to the disconnection of the overcurrent protection switch, ensuring that the fan can resume operation after the first voltage and the second voltage return to normal, thereby ensuring that the key components in the server system maintain heat dissipation and avoiding the risk of damage due to overtemperature.

[0080] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0081] Please refer to Figure 1 for details. Figure 1 is a structural block diagram of the server system. Among them, the programmable AC power supply is input to the power supply unit, and then the power supply unit supplies power to the server system (such as the motherboard, OCP (Open Compute Project) network card, central processing unit, fan and hard disk array, etc.). Please refer to Figure 2, which is a waveform diagram of the voltage drop provided by this application. In the current server system, insufficient power supply to the fan may cause the fan speed to drop. The fan controller will perform closed-loop control on the fan speed, thereby increasing the duty cycle of the PWM signal, causing a large impulse current, thereby triggering the fan's overcurrent protection switch, causing the fan to stop. At this time, although the AC power and the power supply unit have resumed normal power supply, due to the fan stopping, key components may overheat and be at risk of damage.

[0082] To further understand the fan power supply principle, please refer to Figures 3 and 4. Figure 3 is a schematic diagram of a general power supply structure of a fan provided by this application, and Figure 4 is a schematic diagram of an internal power supply of a fan provided by this application. In Figure 3, after the power supply unit is powered on, P12V_PSU is output to provide standby power for the motherboard. At this time, the motherboard (or a processor on the motherboard) will detect the presence of the OCP network card (device to be cooled). If the OCP network card is detected to be in place (OCP CARD_PRESENT_N signal is low and valid), the motherboard will send a P12V_FAN_EN signal to control the overcurrent protection switch to close, output the P12V_FAN voltage, and power the system fan units 1-4. In Figure 4, P12V_PSU outputs P12V_FAN through the overcurrent protection switch. P12V_FAN is used as the power input for the fan unit and is divided into two paths after entering the fan unit. The first path passes through the isolation diode D1, and the MOS tube Q supplies power to the fan (specifically the fan motor). The second path passes through the isolation diode D2, and then the voltage conversion unit converts it to P5V to power the fan controller. The fan controller automatically adjusts the fan speed based on the detected fan speed, outputting a PWM signal that is transmitted to the driver module to generate a signal to control the MOS transistor Q, thereby controlling the fan motor speed.

[0083] In the first aspect, please refer to FIG5 , which is a structural block diagram of a fan control system provided by the present application, and refer to FIG6 , which is a schematic diagram of an improved power supply structure of a fan provided by the present application.

[0084] The fan control system is applied to a server system, which includes a power supply unit, a mainboard, an overcurrent protection switch, an energy storage unit, a fan controller, and a fan. The input end of the power supply unit inputs an AC power supply, the output end of the power supply unit is connected to the power end of the mainboard, and is connected to the power end of the energy storage unit, the power end of the fan controller, and the power end of the fan through the overcurrent protection switch. The output end of the mainboard is connected to the enable end of the overcurrent protection switch, and the fan controller is connected to the fan.

[0085] The fan control system includes:

[0086] A detection circuit 11, having an input end connected to the input end and / or output end of the power supply unit and an output end connected to the mainboard, for obtaining a first voltage of the AC power supply and / or a second voltage output by the power supply unit during fan rotation;

[0087] The delay circuit 12 is provided between the output terminal of the mainboard and the enable terminal of the overcurrent protection switch, and the delay time of the delay circuit 12 is a preset time;

[0088] The mainboard is used to output a closing signal to the overcurrent protection switch through the delay circuit 12 when the server system meets the preset cooling conditions, so that the overcurrent protection switch is closed after a preset time; when the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, stop outputting the closing signal to the delay circuit 12, so that the energy storage unit is discharged within the preset time, so that the fan controller is powered off.

[0089] In some embodiments, the detection circuit 11 obtains a first voltage from the AC power source and / or a second voltage output by the power supply unit to monitor the current voltage status. The first voltage can be a voltage directly obtained from the AC power source, and the second voltage can be a voltage output by the power supply unit. By monitoring these voltages, the status of the AC power and the power supply unit can be understood in real time, and appropriate control measures can be taken based on this information. This can help the system detect voltage drops in a timely manner, providing accurate trigger conditions for subsequent fan control.

[0090] In specific implementations, the overcurrent protection switch monitors whether the current exceeds the rated range. When the current exceeds the rated range, the overcurrent protection switch automatically disconnects the circuit to protect the safe operation of the system. The energy storage unit provides a certain period of power reserve when the power supply is unstable or suddenly lost, ensuring the normal operation of the fan and preventing the server system from shutting down due to power fluctuations or interruptions. The specific implementation of the energy storage unit can be, but is not limited to, a capacitor. Technically speaking, the use of an overcurrent protection switch and an energy storage unit enables reliable control of the fan. During normal operation, the fan monitors the power supply status in real time by obtaining the voltage of the AC power supply and the output voltage of the power supply unit. When the voltage of the AC power supply or the output voltage of the power supply unit drops to a preset value, the fan controller is controlled to power down to prevent the low voltage from affecting the normal operation of the fan.

[0091] For example, when the AC power supply voltage of a server system drops or the output voltage of the power supply unit drops to a preset value, the fan controller is controlled to power down to protect the fans from the voltage drop. Furthermore, when the current exceeds the rated range, the overcurrent protection switch automatically disconnects the circuit, ensuring the safe operation of the entire system. Furthermore, additional voltage stabilizers or power management devices can be added between the fan controller and the energy storage unit to improve the reliability and stability of fan control.

[0092] In some embodiments, a delay circuit 12 in the server system is used to set a delay time to control the timing of the motherboard's output of a close signal to the overcurrent protection switch. In one embodiment, the delay circuit 12 is positioned between the motherboard's output terminal and the enable terminal of the overcurrent protection switch. By presetting the delay time to a desired interval, the function of continuously outputting a close signal to the overcurrent protection switch can be achieved.

[0093] Specifically, when the first voltage or the second voltage drops to the corresponding preset voltage, the mainboard will begin to output a closing signal to the delay circuit 12. The delay circuit 12 maintains the output of the closing signal according to the preset delay time, and stops outputting the closing signal after a preset time interval. In this way, time control under specific conditions can be achieved through the control of the delay circuit 12. That is, after the control of the delay circuit 12, the closing signal reaches the enable terminal of the overcurrent protection switch, causing the overcurrent protection switch to close. The closed overcurrent protection switch will cause the energy storage unit to begin discharging, thereby controlling the power supply voltage of the fan controller to drop below the threshold voltage. In this way, the fan controller will lose power and power down.

[0094] By introducing the delay circuit 12, the power-off timing of the fan controller can be more accurately controlled. The delay time of the delay circuit 12 can be adjusted and preset according to specific needs (specifically, it can be adjusted according to the time required for the fan controller's supply voltage to drop to the threshold voltage during the energy storage unit discharge process), thereby flexibly controlling the power-off time of the fan controller in different situations.

[0095] In summary, in this embodiment, the performance and reliability of the server system are improved by introducing the delay circuit 12 and optimizing the control method. At the same time, a more flexible and intelligent fan control strategy is provided, which brings convenience and security to the operation and maintenance of the server system.

[0096] In summary, this embodiment provides an improved server system. By introducing an overcurrent protection switch and an energy storage unit, reliable control of the fan can be achieved, ensuring the normal operation of the fan in an unstable power environment and improving the safety and reliability of the entire system.

[0097] In this embodiment, if the first voltage drops below a first preset voltage or the second voltage drops below a second preset voltage, the mainboard is controlled to continuously output a closing signal to the overcurrent protection switch to prevent the overcurrent protection switch from opening. This causes the energy storage unit to discharge for a preset time, thereby reducing the fan controller's supply voltage to below a threshold voltage, thereby achieving power-down operation. This prevents the fan controller from continuing to operate under low voltage conditions, which could cause malfunction or damage.

[0098] During implementation, different preset voltages and threshold voltages can be set to meet the needs of different server systems. For example, depending on the performance and load of the server system, a lower preset voltage and threshold voltage can be set, so that the fan controller is powered off when the voltage drops below a certain level, ensuring that the fan controller is not affected by low voltage.

[0099] As can be seen, some of these embodiments can ensure that the server system is powered off promptly when the voltage drops to a certain level, and provide a stable power supply through the use of an overcurrent protection switch and energy storage unit. This prevents the fan controller from continuing to operate when the voltage is too low, which could cause malfunction or damage, thereby improving the stability and reliability of the server system. Furthermore, by setting different preset voltages and threshold voltages, and combining the coordinated operation of the motherboard, overcurrent protection switch, and energy storage unit, fans can be activated and controlled according to the needs of different server systems, further improving the performance and energy efficiency of the server system.

[0100] Please refer to FIG. 7 , which is a schematic diagram of an improved internal power supply for a fan provided by the present application.

[0101] In some embodiments, the detection circuit 11 is specifically used to obtain the second voltage output by the power supply unit during the rotation of the fan; the detection circuit is specifically used to obtain the second voltage output by the power supply unit during the rotation of the fan; the fan control system further includes:

[0102] The undervoltage detection circuit has an input end connected to the output end of the power supply unit and the power end of the fan controller respectively, and an output end connected to the reset end of the fan controller. The circuit is used to compare the second voltage output by the power supply unit with the threshold voltage of the fan controller, and when the second voltage is less than the threshold voltage, output a reset signal to the reset end of the fan controller to reset the fan controller, thereby triggering the fan controller to readjust the fan speed.

[0103] The undervoltage detection circuit includes:

[0104] A sampling circuit, the input end of which is connected to the power supply end of the fan controller, for obtaining the threshold voltage of the fan controller;

[0105] The comparison circuit has a first input end connected to the output end of the detection circuit 11, a second input end connected to the output end of the sampling circuit, and an output end connected to the reset end of the fan controller. It is used to output a reset signal to the reset end of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the fan speed.

[0106] In some embodiments, the undervoltage detection circuit functions to monitor whether the output voltage of the power supply unit is less than the threshold voltage of the fan controller. The detection circuit 11 is used to collect the output voltage of the power supply unit and connect it to the first input of the comparison circuit. The sampling circuit is used to detect the threshold voltage of the fan controller and connect it to the second input of the comparison circuit. The comparison circuit compares whether the voltage value at the first input is less than the voltage value at the second input. In a specific implementation, the comparison circuit determines whether the voltage value at the first input is less than the voltage value at the second input. If the voltage value at the first input is less than the voltage value at the second input, it indicates that the output voltage of the power supply unit is less than the threshold voltage of the fan controller. Conversely, if the voltage value at the first input is not less than the voltage value at the second input, it indicates that the output voltage of the power supply unit is not less than the threshold voltage of the fan controller. In some embodiments, when the detection circuit 11 is specifically used to detect the second voltage of the power supply unit, both the detection circuit 11 and the sampling circuit are resistor divider circuits. The comparison circuit can be a comparator. When the sampling circuit is a resistor divider circuit, the sampling circuit includes a first resistor (R3 in FIG. 7 ) and a second resistor (R4 in FIG. 7 ); one end of the first resistor is connected to the power supply terminal of the fan controller, the other end of the first resistor is connected to one end of the second resistor and serves as the output terminal of the sampling circuit, and the other end of the second resistor is grounded. When the detection circuit is a resistor divider circuit, the detection circuit includes a third resistor (R1 in FIG. 7 ) and a fourth resistor (R2 in FIG. 7 ); one end of the third resistor is connected to the output terminal of the power supply unit, the other end of the third resistor is connected to one end of the fourth resistor and serves as the output terminal of the detection circuit, and the other end of the fourth resistor is grounded. When the comparison circuit is a comparator, the comparison circuit is a comparator; the positive input terminal is connected to the output terminal of the detection circuit, the negative input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, and is used to output a low-level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan; or, the negative input terminal is connected to the output terminal of the detection circuit, the positive input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, and is used to output a high-level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

[0107] For example, assume that the second voltage output by the power supply unit in the server system is the reference voltage for the fan speed. When the AC power supply or the power supply unit fails and causes the second voltage to drop below the second preset voltage, the comparison circuit will trigger a reset signal and send it to the fan controller. After receiving the reset signal, the fan controller will be reinitialized, re-judge the voltage situation, and adjust the fan speed to ensure the heat dissipation performance of the server system. In Figure 7, at the power supply input terminal P12V_FAN of the internal circuit of the fan, VP is obtained by voltage division of resistors R1 and R2 and connected to the non-inverting input terminal of the comparator. P5V output by the internal voltage conversion unit of the fan is divided by resistors R3 and R4 to obtain VN and connected to the inverting terminal of the comparator. The output signal RESET_N of the voltage comparator is connected to the Reset pin of the fan controller. When P12V_FAN drops below the undervoltage threshold Vuv, at this time: VP < VN. The output signal RESET_N of the voltage comparator becomes low level. At this time, the fan controller will be reset, and the fan controller will reinitialize and regulate the fan speed according to the normal fan startup process.

[0108] The undervoltage detection circuit in some of these embodiments can effectively monitor whether the output voltage of the power supply unit meets the requirements of the fan controller. Through the judgment of the comparison circuit, it can be timely found whether the output voltage of the power supply unit is lower than the threshold voltage, so as to control the power-off action of the fan controller. This can ensure that in case of insufficient or abnormal power supply, even if the fan controller loses power, timely measures can be taken to avoid possible damage or faults, and ensure the normal operation and stability of the server system.

[0109] In some of these embodiments, the energy storage unit is a capacitor. In some of these embodiments, the delay circuit 12 is a timer or a timer or an RC circuit.

[0110] In some of these embodiments, when the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, the motherboard is used to stop outputting the closing signal to the delay circuit, so as to stop outputting the closing signal to the overcurrent protection switch through the delay circuit for a preset time, so that the energy storage unit discharges within the preset time, causing the fan controller to lose power.

[0111] In a second aspect, the present application also provides a server system. Please refer to Figure 8. Figure 8 is a structural block diagram of a server system provided by the present application. The system includes a power supply unit, a motherboard, an overcurrent protection switch, an energy storage unit, a fan controller, a fan, and a fan control system as described in any one of the above;

[0112] The input end of the power supply unit inputs AC power, the output end of the power supply unit is connected to the power end of the mainboard, and is connected to the power end of the energy storage unit, the power end of the fan controller and the power end of the fan through the overcurrent protection switch. The output end of the mainboard is connected to the enable end of the overcurrent protection switch, and the fan controller is connected to the fan.

[0113] In the third aspect, please refer to FIG. 9 , which is a flow chart of a fan control method provided by the present application. The fan control method is applied to the above-mentioned fan control system. The fan control method includes:

[0114] S11: During the rotation of the fan, obtaining a first voltage of the AC power supply and / or a second voltage output by the power supply unit;

[0115] In some embodiments, the current voltage status is monitored by obtaining a first voltage from the AC power supply and / or a second voltage output by the power supply unit. The first voltage can be a voltage directly obtained from the AC power supply, and the second voltage can be a voltage output from the power supply unit. By monitoring these voltages, the status of the AC power and the power supply unit can be understood in real time, and appropriate control measures can be taken based on this information. This can help the system detect voltage drops in a timely manner, providing accurate trigger conditions for subsequent fan control.

[0116] In some embodiments, sensors may be used to monitor the voltage of the AC power source and the voltage output by the power supply unit in real time.

[0117] S12: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

[0118] The design idea of ​​this embodiment is: by monitoring the voltage of the AC power supply and the voltage output by the power supply unit, and setting a preset voltage value, when the voltage drops below the preset voltage, the control mainboard is triggered to continuously output a closed signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for the preset time and then controls the fan controller to power off, thereby ensuring the normal operation of the fan.

[0119] In some embodiments, the fan controller can control the mainboard to continuously output a closed signal to the overcurrent protection switch for a preset time when the AC voltage or the output voltage of the power supply unit drops to a preset voltage level (specifically, the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage), so that the energy storage unit discharges for a preset time and thus controls the fan controller to power off. This fan power-off control can achieve power-off operation on the fan by controlling the working state of the fan controller. The specific operation can be to turn off the fan controller or disconnect the power connection between the power supply unit and the fan. By executing this control operation, the system can reduce or stop the operation of the fan in a timely manner to reduce the risk of insufficient power supply to the fan and thus triggering overcurrent protection.

[0120] Furthermore, in some embodiments, the AC power supply voltage and the voltage output by the power supply unit are monitored during fan rotation and compared with preset voltages. If the first voltage drops below a first preset voltage or the second voltage drops below a second preset voltage, the mainboard is controlled to continuously output a closing signal to the overcurrent protection switch to prevent the switch from tripping. This causes the energy storage unit to discharge for a preset time, thereby reducing the fan controller's supply voltage to below a threshold voltage, thereby achieving power-down operation. This prevents continued operation of the fan controller under low voltage conditions, which could potentially cause malfunction or damage.

[0121] During implementation, different preset voltages and threshold voltages can be set to meet the needs of different server systems. For example, depending on the performance and load of the server system, a lower preset voltage and threshold voltage can be set, so that the fan controller is powered off when the voltage drops below a certain level, ensuring that the fan controller is not affected by low voltage.

[0122] As can be seen, some of these embodiments can ensure that the server system is powered off promptly when the voltage drops to a certain level, and provide a stable power supply through the use of an overcurrent protection switch and energy storage unit. This prevents the fan controller from continuing to operate when the voltage is too low, which could cause malfunction or damage, thereby improving the stability and reliability of the server system. Furthermore, by setting different preset voltages and threshold voltages, and combining the coordinated operation of the motherboard, overcurrent protection switch, and energy storage unit, fans can be activated and controlled according to the needs of different server systems, further improving the performance and energy efficiency of the server system.

[0123] For example, in a server system, the power supply unit converts 220V AC power to 12V DC power to power the fan controller and fans. Assume that the first preset voltage is set to 200V and the second preset voltage is set to 8V. When the AC power voltage drops below 200V or the voltage output by the power supply unit drops below 8V, the fan controller will power down to ensure normal operation of the fans.

[0124] In addition, in some embodiments, after obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, it also includes: determining whether a first difference between the first reference voltage and the first voltage is greater than a first threshold, and / or determining whether a second difference between the second reference voltage and the second voltage is greater than a second threshold; if the first difference is greater than the first threshold, determining that the first voltage has dropped to a first preset voltage; if the second difference is greater than the second threshold, determining that the second voltage has dropped to a second preset voltage.

[0125] Specifically, in response to determining that a first difference between the first reference voltage and the first voltage is greater than a first threshold, it is determined that the first voltage has dropped to a first preset voltage. In response to determining that a first difference between the first reference voltage and the first voltage is greater than a first threshold, it is determined that the second voltage has dropped to a second preset voltage.

[0126] Some of these embodiments illustrate how to determine whether a voltage has dropped below a preset voltage based on the difference between a sampled voltage and a corresponding voltage. They further clarify the voltage monitoring and control processes involved in the system and provide a method for implementing power-off control. This power-off control method effectively monitors voltage in server systems and takes timely action to ensure stable system operation.

[0127] In some embodiments, the fan control system further includes a filtering device, which is provided between the output terminal connection of the detection circuit and the mainboard, and is used to filter the first voltage and / or the second voltage obtained by the detection circuit. After obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, it also includes: filtering the first voltage and / or the second voltage. Stable power supply voltage information can be obtained. The filtering process can be achieved by using a filtering circuit or a filtering algorithm. For example, in some embodiments, a capacitor filter can be used to filter the obtained first voltage and / or second voltage signal. By performing real-time monitoring and filtering on the power supply voltage, the stability and reliability of the server system are improved.

[0128] In some embodiments, the fan control system further includes a prompt device connected to the motherboard and configured to output a prompt message when determining that the first voltage has dropped to a first preset voltage and / or when determining that the second voltage has dropped to a second preset voltage. After determining that the first voltage has dropped to the first preset voltage and / or when determining that the second voltage has dropped to the second preset voltage, the system further includes: controlling the prompt device to output the prompt message. In some embodiments, the prompt device is an audio prompt device, a display prompt device, and / or a vibration prompt device.

[0129] Specifically, the prompt device is used to provide a prompt message to the user after determining that the first voltage has dropped to a first preset voltage and / or determining that the second voltage has dropped to a second preset voltage. The prompt device can take various forms, such as a sound prompt device, a display prompt device, and / or a vibration prompt device. In some embodiments, when the fan controller detects that the first voltage of the AC power supply and / or the second voltage output by the power supply unit is lower than a preset voltage, the fan controller triggers a power-off operation to prevent the low voltage from causing adverse effects or malfunction on the fan. At this time, the prompt device will simultaneously output corresponding prompt information to the user so that the user can take timely measures to repair the fault or adjust the power supply. For example, when the first voltage drops to the first preset voltage, the fan controller will control the prompt device to emit a sound prompt to alert the user that there may be a problem with the AC power supply. If the second voltage drops to the second preset voltage, the fan controller can display a warning message through the display prompt device or vibrate the user through the vibration prompt device to attract their attention.

[0130] Furthermore, the notification device can also provide additional functions, such as sending a message to the user's mobile phone or email, or uploading fault information to the server remote monitoring system so that technicians can promptly handle the fault. Through timely notifications and alarms, the reliability and security of the server system can be improved, and the integrity of the server and data can be protected.

[0131] In summary, by adding a notification device and linking it with the fan controller, a more intelligent and reliable fan control method is provided. This method can promptly detect power supply problems and notify the user through various forms of notification information, thereby improving system reliability and user experience.

[0132] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so as to cause the energy storage unit to discharge for a preset time and thereby control the fan controller to power off, including:

[0133] Determining whether a duration of the first voltage dropping to a first preset voltage and / or the second voltage dropping to a second preset voltage reaches a time threshold;

[0134] If so, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for the preset time and then controls the fan controller to power off.

[0135] In which, in response to the duration of the first voltage dropping to the first preset voltage and / or the second voltage dropping to the second preset voltage reaching a time threshold, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for the preset time and thereby controls the fan controller to power off.

[0136] In some embodiments, it is determined whether the duration of the first voltage dropping to the first preset voltage and / or the second voltage dropping to the second preset voltage reaches a time threshold. This time threshold can be set according to the needs of the fan control system. If the duration of the voltage drop exceeds the threshold, it means that there may be some problems and corresponding measures need to be taken. During the operation of the fan, if an abnormality in the power supply is found, resulting in a voltage drop, control measures can be taken in time to avoid further damage to the circuit or equipment. Moreover, by setting a time threshold, unnecessary power-off operations caused by a short-term voltage drop can be avoided, thereby improving the reliability of the system.

[0137] In summary, the methods described in some of these embodiments can effectively address the issues of insufficient fan power supply and overcurrent protection triggering in server systems. This method offers flexibility, allowing for flexible adjustment of preset voltage levels based on actual conditions and the ability to control fan operation at appropriate times. This ensures that the motherboard and other components in the system can continue to operate effectively even after the AC power and power supply unit return to normal operation. Furthermore, timely fan control can reduce the risk of overheating and damage to critical components.

[0138] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closed signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off. Furthermore, the control mainboard further includes: when the first voltage and the second voltage are restored, controlling the fan controller to power on again to restart the fan. In some embodiments, when the first voltage and the second voltage are restored, controlling the fan controller to power on again to restart the fan includes: when the first voltage and the second voltage are restored, delaying the control of the fan controller to power on again to restart the fan.

[0139] In some embodiments, controlling the fan controller to power on again to restart the fan when both the first and second voltages are restored includes delaying the fan controller from powering on again when both the first and second voltages are restored. The delay time can be set as needed to fully ensure normal operation of the fan while ensuring a stable power supply. The delay control can be implemented using a timer or other implementation methods.

[0140] The core concept of this embodiment is to control the fan controller to power off, determine whether the fan needs to be restarted by judging conditions, and then control the power supply unit to repower the fan controller after the voltage is restored to resume fan operation. This effectively protects the safety and stability of the fan and server system, and can dynamically control the fan's operating status according to actual needs, improving the system's energy efficiency and service life.

[0141] In terms of technical principles, by monitoring the voltage of the AC power supply and the voltage output by the power supply unit, the energy information required by the fan can be obtained in real time. When the voltage drops below the preset value, the fan controller is controlled to power off to avoid damage to the fan due to unstable power supply. When the voltage recovers, the fan controller is controlled to power on again with a delay to ensure that the power supply is stable before restarting the fan, avoiding frequent starts and stops caused by power fluctuations, thereby extending the life of the fan. The specific implementation method can be completed through hardware circuits, controllers and software. For example, voltage monitoring is added to the fan controller, and the fan controller can be controlled and restarted through programming.

[0142] In some embodiments, the fan control method further includes:

[0143] When the preset cooling conditions are met, the control mainboard outputs a closing signal to the overcurrent protection switch, so that the overcurrent protection switch is closed for a preset delay time to start the fan.

[0144] In some embodiments, the server system further includes an electronic device to be cooled and connected to the mainboard, and the fan control method further includes:

[0145] Determine whether the electronic device to be cooled is connected to the mainboard;

[0146] If so, it is determined that the preset cooling condition is met.

[0147] In which, in response to the electronic device to be cooled being connected to the mainboard, it is determined that the preset cooling condition is met.

[0148] In some embodiments, the server system further includes electronic components to be cooled and connected to the motherboard. These electronic components may include processors, graphics cards, memory cards, and in some embodiments, OCP network cards. During server operation, a high level of heat is generated. To ensure the proper operation and extend the life of these electronic components, timely heat dissipation and cooling are necessary.

[0149] Therefore, in some embodiments, whether the preset cooling conditions are met is determined by whether the electronic device to be cooled is connected to the mainboard. If the electronic device to be cooled is connected to the mainboard, it indicates that there is a risk of high temperature during system operation, meaning that the electronic device to be cooled requires timely cooling. In this case, based on the preset cooling conditions, the mainboard can be controlled to output a closing signal to the overcurrent protection switch, causing it to close and thus activating the fan.

[0150] Once the fan is started, the fan controller controls its speed and rotational speed, thereby forcing the electronic components to cool down to cool down, thereby reducing their temperature. Specifically, the fan controller performs closed-loop speed control based on parameters such as fan speed and input current, dynamically adjusting the fan's operating status to achieve optimal cooling. Furthermore, the fan controller can monitor fan faults, such as abnormal fan speed or fan stall, and promptly issue alarms or take appropriate measures to ensure stable system operation.

[0151] Furthermore, to achieve more efficient heat dissipation, the server system in the above embodiment is also equipped with an energy storage unit, which is connected to the power supply terminal of the fan controller. When the fan loses power, the energy storage unit can provide power to the fan, allowing the fan to continue operating for a short period of time, thus maintaining the system's heat dissipation effect.

[0152] In summary, in some of the embodiments, the present application can achieve intelligent heat dissipation control of electronic devices to be cooled, improve the stability and heat dissipation effect of the server system, and extend the service life of the electronic devices.

[0153] In some embodiments, the preset time is not less than a preset multiple of the discharge time, and the discharge time is the time required for the power supply voltage of the fan controller to drop to the threshold voltage during the discharge of the energy storage unit.

[0154] In some embodiments, the meaning of the preset time can be further clarified based on the above embodiments. In some embodiments, a preset time discharge method based on the threshold voltage can be provided. By continuing to control the mainboard to output a closed signal to the overcurrent protection switch after the power supply voltage of the fan controller drops below the threshold voltage, so that the energy storage unit discharges for the preset time, more intelligent and adaptive fan control is achieved. For example, if the time required for the power supply voltage of the fan controller to drop to the threshold voltage during the discharge of the energy storage unit is 2-3 seconds, the preset time can be set to 5 seconds. During this time, the discharge of the energy storage unit causes the power supply voltage of the fan controller to reliably drop below the threshold voltage, thereby controlling the power off of the fan controller.

[0155] In some embodiments, the fan control method further includes:

[0156] When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the fan controller is reset to trigger the fan controller to readjust the speed of the fan.

[0157] In some embodiments, when the first voltage of the AC power source drops to a predetermined first voltage and / or the second voltage output by the power supply unit drops to a predetermined second voltage, the fan controller is controlled to power off. This is done to reinitialize the fan controller by powering off and thereby readjust the fan speed.

[0158] In some of these embodiments, when the first voltage or the second voltage drops to a preset voltage level, a sensor can be used to monitor the voltage change. The sensor can be connected to the output of the AC power supply and the power supply unit to obtain voltage information in real time. Once the first voltage drops to the preset first voltage and / or the second voltage drops to the preset second voltage, the fan controller will be powered off by the controller. This can be achieved by disconnecting the power connection of the fan controller, for example by disconnecting the corresponding power switch or disconnecting the power line. After power failure, the fan controller can be reinitialized through some reset or restart mechanism. For example, the fan controller can be triggered to restart by sending a reset signal or reapplying power. Once the fan controller restarts, it will re-regulate the fan speed by controlling the power supply and voltage to the fan. It is possible to avoid increasing the duty cycle of the PWM signal to 100% when the voltage drops to avoid triggering the overcurrent protection switch.

[0159] It can be seen that through some embodiments of the present application, it is possible to automatically control the fan controller to power off when the power supply voltage drops to a preset level, and readjust the fan speed by reinitializing the fan controller.

[0160] In some embodiments, before the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so as to cause the energy storage unit to discharge for a preset time and thereby control the fan controller to power off, the method further includes:

[0161] Determine whether the voltage output by the power supply unit is less than the threshold voltage of the fan controller;

[0162] If it is less than, it is determined that the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, and the control mainboard continuously outputs a closed signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and then controls the fan controller to power off.

[0163] In which, in response to the voltage output by the power supply unit being less than the threshold voltage of the fan controller, it is determined that the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, and the control mainboard continuously outputs a closing signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

[0164] In some embodiments, whether the first or second voltage has dropped is determined by determining whether the voltage output by the power supply unit is less than a threshold voltage of the fan controller. This design ensures that, while the fan controller is functioning normally, a power-down operation is triggered only when the voltage output by the power supply unit falls below the threshold voltage, thus avoiding unnecessary power downs. This embodiment optimizes the energy efficiency and reliability of the server system by triggering a power-down operation in the fan controller when the voltage output by the power supply unit falls below the threshold voltage.

[0165] In some embodiments, the undervoltage detection circuit in the fan control system includes a sampling circuit and a comparison circuit for detecting a threshold voltage of the fan controller, the detection circuit is connected to a first input terminal of the comparison circuit, and the sampling circuit is connected to a second input terminal of the comparison circuit;

[0166] Determining whether the voltage output by the power supply unit is less than a threshold voltage of the fan controller includes:

[0167] Comparing the voltage value of the first input terminal of the device with the comparison circuit to see whether it is smaller than the voltage value of the second input terminal;

[0168] If the voltage value of the first input terminal is less than the voltage value of the second input terminal, it is determined that the second voltage output by the power supply unit is less than the threshold voltage of the fan controller; otherwise, it is determined that the second voltage output by the power supply unit is not less than the threshold voltage of the fan controller.

[0169] Specifically, the comparison circuit compares whether the voltage value of its own first input terminal is less than the voltage value of the second input terminal. In response to the voltage value of the first input terminal being less than the voltage value of the second input terminal, it is determined that the second voltage output by the power supply unit is less than the threshold voltage of the fan controller. In response to the voltage value of the first input terminal being not less than the voltage value of the second input terminal, it is determined that the second voltage output by the power supply unit is not less than the threshold voltage of the fan controller.

[0170] In some embodiments, the sampling circuit functions to monitor whether the output voltage of the power supply unit is less than the threshold voltage of the fan controller. The detection circuit is used to collect the output voltage of the power supply unit and connect it to the first input of the comparison circuit. The sampling circuit is used to detect the threshold voltage of the fan controller and connect it to the second input of the comparison circuit. The comparison circuit is used to compare whether the voltage value at the first input is less than the voltage value at the second input. In a specific implementation, the comparison circuit determines whether the voltage value at the first input is less than the voltage value at the second input. If the voltage value at the first input is less than the voltage value at the second input, it indicates that the output voltage of the power supply unit is less than the threshold voltage of the fan controller. Conversely, if the voltage value at the first input is not less than the voltage value at the second input, it indicates that the output voltage of the power supply unit is not less than the threshold voltage of the fan controller. In some embodiments, the detection circuit and the sampling circuit can both be resistor divider circuits. The comparison circuit can be a comparator.

[0171] In some embodiments, the undervoltage detection circuit effectively monitors whether the power supply unit's output voltage meets the fan controller's requirements. The comparison circuit promptly detects whether the power supply unit's output voltage falls below the threshold voltage, thereby controlling the fan controller's power-off action. This ensures that even if the fan controller loses power due to insufficient or abnormal power supply, timely measures can be taken to prevent potential damage or failure, thus ensuring the normal operation and stability of the server system.

[0172] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, resetting the fan controller to trigger the fan controller to readjust the fan speed includes:

[0173] When it is determined that the voltage value of the first input terminal is less than the voltage value of the second input terminal, the comparison circuit is triggered to output a reset signal to the fan controller to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

[0174] In some embodiments, when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the comparison circuit is triggered to output a reset signal to the fan controller to reset the fan controller and readjust the fan speed.

[0175] Specifically, first, when it is determined that the voltage value at the first input terminal is less than the voltage value at the second input terminal, a reset signal is triggered by a comparison circuit. The comparison circuit can be an electronic circuit that compares the magnitude of two input values ​​and outputs a corresponding signal based on the comparison result. When the voltage value at the first input terminal is less than the voltage value at the second input terminal, the comparison circuit generates a reset signal. This reset signal can be directly connected to the fan controller to reset the fan controller. The reset operation reinitializes the fan controller, returning it to its initial state. After the reset, the fan controller can re-adjust the fan speed based on the current voltage conditions. This allows the fan speed to be automatically adjusted according to voltage changes.

[0176] Fourthly, the present application further provides a fan control device. Please refer to FIG10 , which is a structural block diagram of a fan control device provided by the present application. The device is applied to the above-mentioned fan control system. The fan control system includes:

[0177] The voltage acquisition unit 81 is used to acquire the first voltage of the AC power supply and / or the second voltage output by the power supply unit during the rotation of the fan;

[0178] The control unit 82 is configured to control the fan controller to power off when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage.

[0179] In some embodiments, the server system further includes a mainboard, an overcurrent protection switch, and an energy storage unit;

[0180] The output end of the power supply unit is also connected to the power end of the mainboard, one end of the overcurrent protection switch is connected to the output end of the power supply unit, the other end of the overcurrent protection switch is respectively connected to the power end of the fan controller and the power end of the fan, the enable end of the overcurrent protection switch is connected to the output end of the mainboard, and the energy storage unit is connected to the power end of the fan controller;

[0181] The control system also includes:

[0182] The fan starting unit is used to control the mainboard to output a closing signal to the overcurrent protection switch when the preset cooling conditions are met, so that the overcurrent protection switch is closed to start the fan.

[0183] In some embodiments, the server system further includes an electronic device to be cooled connected to the mainboard, and the method further includes:

[0184] The in-situ detection unit is used to determine whether the electronic device to be cooled is connected to the mainboard; if so, it is determined that the preset cooling conditions are met.

[0185] In some embodiments, the control unit is specifically used to control the mainboard to continuously output a closing signal to the overcurrent protection switch for a preset time when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

[0186] In some embodiments, the preset time is not less than a preset multiple of the discharge time, and the discharge time is the time required for the power supply voltage of the fan controller to drop to the threshold voltage during the discharge of the energy storage unit.

[0187] In some embodiments, the server system further includes a delay circuit 12, the delay circuit 12 is provided between the output terminal of the mainboard and the enable terminal of the overcurrent protection switch, and the delay time of the delay circuit 12 is a preset time;

[0188] The control unit is specifically used to control the main board to stop outputting the closing signal to the delay circuit 12 when the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, so as to stop outputting the closing signal to the overcurrent protection switch by delaying the preset time through the delay circuit 12, so that the energy storage unit discharges for the preset time and thereby controls the fan controller to power off.

[0189] In some embodiments, the control unit is specifically configured to reset the fan controller when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so as to trigger the fan controller to readjust the speed of the fan.

[0190] In some embodiments, further comprising:

[0191] The first judgment unit is used to determine whether the voltage output by the power supply unit is less than the threshold voltage of the fan controller before controlling the fan controller to power off; if less than, it is determined that the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, and enters the step of controlling the fan controller to power off.

[0192] In some embodiments, the server system further includes an undervoltage detection circuit, the undervoltage monitoring circuit including a first sampling circuit for collecting voltages of the power supply unit, a second sampling circuit for detecting a threshold voltage of the fan controller, and a comparison circuit, the first sampling circuit being connected to a first input terminal of the comparison circuit, and the second sampling circuit being connected to a second input terminal of the comparison circuit;

[0193] The first judgment unit is specifically used to compare whether the voltage value of its own first input terminal is less than the voltage value of the second input terminal through a comparison circuit; if the voltage value of the first input terminal is less than the voltage value of the second input terminal, it is determined that the voltage output by the power supply unit is less than the threshold voltage of the fan controller; otherwise, it is determined that the voltage output by the power supply unit is not less than the threshold voltage of the fan controller.

[0194] In some embodiments, the control unit is specifically configured to trigger the comparison circuit to output a reset signal to the fan controller when determining that the voltage value of the first input terminal is less than the voltage value of the second input terminal, so as to reset the fan controller and trigger the fan controller to readjust the fan speed.

[0195] In some embodiments, the first sampling circuit and the second sampling circuit are both resistor voltage divider circuits.

[0196] In some embodiments, further comprising:

[0197] The second judgment unit is used to judge whether a first difference between the first reference voltage and the first voltage is greater than a first threshold value, and / or to judge whether a second difference between the second reference voltage and the second voltage is greater than a second threshold value; if the first difference is greater than the first threshold value, it is judged that the first voltage drops to a first preset voltage; if the second difference is greater than the second threshold value, it is judged that the second voltage drops to a second preset voltage.

[0198] In some embodiments, further comprising:

[0199] The filtering unit is configured to filter the first voltage and / or the second voltage.

[0200] In some embodiments, the server system further includes a prompting device; and further includes:

[0201] The prompt unit is used to control the prompt device to output prompt information.

[0202] In some embodiments, the prompt device is a sound prompt device and / or a display prompt device and / or a vibration prompt device.

[0203] In some embodiments, the control unit is specifically configured to determine whether the duration of the first voltage dropping to the first preset voltage and / or the second voltage dropping to the second preset voltage reaches a time threshold; if so, control the fan controller to power off.

[0204] In some embodiments, further comprising:

[0205] The restart unit is used to control the fan controller to power on again when the first voltage is restored and the second voltage is restored, so as to restart the fan.

[0206] In some embodiments, the restart unit is specifically configured to delay controlling the fan controller to power on again when the first voltage is restored and the second voltage is restored, so as to restart the fan.

[0207] For an introduction to the fan control system, please refer to the above embodiments, which will not be described in detail in this application.

[0208] In some embodiments, the server system of the present application may also include a memory and one or more processors, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the one or more processors execute the steps of the fan control method provided in any embodiment of the third aspect above.

[0209] In some embodiments, the internal structure diagram of the server system may be as shown in Figure 11. The computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the fan control method of the present application is implemented.

[0210] For an introduction to the fan control device, please refer to the above embodiments, which will not be described in detail in this application.

[0211] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0212] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fan control system, characterized in that: Applied to a server system, the server system includes a power supply unit, a mainboard, an overcurrent protection switch, an energy storage unit, a fan controller and a fan; an input end of the power supply unit inputs an AC power supply, an output end of the power supply unit is connected to a power supply end of the mainboard, and is connected to the energy storage unit, the power supply end of the fan controller and the power supply end of the fan through the overcurrent protection switch, the output end of the mainboard is connected to an enable end of the overcurrent protection switch, and the fan controller is connected to the fan; The fan control system comprises: a detection circuit, the input end of which is connected to the input end and / or the output end of the power supply unit, and the output end of which is connected to the mainboard, and is used to obtain the first voltage of the AC power supply and / or the second voltage output by the power supply unit during the rotation of the fan; A delay circuit is provided between the output terminal of the mainboard and the enable terminal of the overcurrent protection switch, and the delay time of the delay circuit is a preset time; and The mainboard is used to output a closing signal to the overcurrent protection switch through the delay circuit when the server system meets the preset cooling conditions, so that the overcurrent protection switch is closed after the preset time; when the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, stop outputting the closing signal to the delay circuit, so that the energy storage unit discharges within the preset time, so that the fan controller is powered off.

2. The fan control system according to claim 1, characterized in that: The detection circuit is specifically used to obtain the second voltage output by the power supply unit during the rotation of the fan; the fan control system also includes: An undervoltage detection circuit, wherein the input end is respectively connected to the output end of the power supply unit and the power end of the fan controller, and the output end is connected to the reset end of the fan controller, and is used to compare a second voltage output by the power supply unit with a threshold voltage of the fan controller, and when the second voltage is less than the threshold voltage, output a reset signal to the reset end of the fan controller to reset the fan controller, so as to trigger the fan controller to readjust the speed of the fan.

3. The fan control system according to claim 2, characterized in that: The undervoltage detection circuit comprises: a sampling circuit, the input end of which is connected to the power supply end of the fan controller, and is used to obtain the threshold voltage of the fan controller; and A comparison circuit, having a first input end connected to the output end of the detection circuit, a second input end connected to the output end of the sampling circuit, and an output end connected to the reset end of the fan controller, for outputting a reset signal to the reset end of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

4. The fan control system according to claim 3, characterized in that: The comparison circuit is a comparator; the positive input terminal is connected to the output terminal of the detection circuit, the negative input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, and is used for outputting a low level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to re-regulate the speed of the fan; Or, the negative input terminal is connected to the output terminal of the detection circuit, the positive input terminal is connected to the output terminal of the sampling circuit, and the output terminal is connected to the reset terminal of the fan controller, and is used to output a high-level signal to the reset terminal of the fan controller when the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, so as to reset the fan controller and trigger the fan controller to readjust the speed of the fan.

5. The fan control system according to claim 3, characterized in that: The sampling circuit includes a first resistor and a second resistor; one end of the first resistor is connected to the power supply end of the fan controller, the other end of the first resistor is connected to one end of the second resistor and serves as the output end of the sampling circuit, and the other end of the second resistor is grounded.

6. The fan control system according to claim 1, wherein: When the detection circuit is specifically used to detect the second voltage of the power supply unit, the detection circuit includes a third resistor and a fourth resistor; one end of the third resistor is connected to the output end of the power supply unit, the other end of the third resistor is connected to one end of the fourth resistor and serves as the output end of the detection circuit, and the other end of the fourth resistor is grounded.

7. The fan control system according to claim 1, wherein: The delay time of the delay circuit is determined according to the type of the fan controller and the type of the fan; and the preset time is not less than a preset multiple of the discharge time, and the discharge time is the time required for the power supply voltage of the fan controller to drop to the threshold voltage during the discharge of the energy storage unit.

8. The fan control system according to claim 1, wherein: The energy storage unit is a capacitor.

9. The fan control system according to claim 1, wherein: The delay circuit is a timer or a counter or an RC circuit.

10. The fan control system according to claim 1, wherein: It also includes a filtering device, which is arranged between the output terminal of the detection circuit and the main board, and is used for filtering the first voltage and / or the second voltage obtained by the detection circuit.

11. The fan control system according to claim 1, wherein: It also includes a prompt device connected to the main board, which is used to output prompt information when it is determined that the first voltage drops to a first preset voltage and / or when it is determined that the second voltage drops to a second preset voltage.

12. The fan control system according to claim 11, wherein: The prompting device is a sound prompting device and / or a display prompting device and / or a vibration prompting device.

13. The fan control system according to claim 1, wherein: The mainboard is used to stop outputting the closing signal to the delay circuit when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so as to stop outputting the closing signal to the overcurrent protection switch by delaying the preset time through the delay circuit, so that the energy storage unit discharges within the preset time, thereby cutting off the power of the fan controller.

14. A server system, characterized in that: It comprises a power supply unit, a mainboard, an overcurrent protection switch, an energy storage unit, a fan controller, a fan, and a fan control system as claimed in any one of claims 1 to 12; An AC power source is input to the input end of the power supply unit, an output end of the power supply unit is connected to the power end of the mainboard, and is connected to the energy storage unit, the power end of the fan controller and the power end of the fan through the overcurrent protection switch, an output end of the mainboard is connected to the enable end of the overcurrent protection switch, the fan controller is connected to the fan, an input end of the fan control system is connected to the input end and / or output end of the power supply unit, and an output end of the fan control system is connected to the fan controller.

15. A fan control method, characterized in that: Applied to the fan control system according to any one of claims 1 to 13, the method comprises: During the rotation of the fan, obtaining a first voltage of the AC power supply and / or a second voltage output by a power supply unit; and When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the control mainboard continuously outputs a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

16. The fan control method according to claim 15, wherein: Also includes: When the preset temperature drop condition is met, the mainboard is controlled to output a closing signal to the overcurrent protection switch, so that the overcurrent protection switch is closed after a preset delay time to start the fan.

17. The fan control method according to claim 16, wherein: The server system further includes an electronic device to be cooled and connected to the mainboard, and further includes: When the electronic device to be cooled is connected to the mainboard, it is determined that the preset cooling condition is met.

18. The fan control method according to claim 15, wherein: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, controlling the mainboard to continuously output a closing signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and then controls the fan controller to power off, including: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the mainboard is controlled to stop outputting the closing signal to the delay circuit, so as to stop outputting the closing signal to the overcurrent protection switch by delaying the preset time through the delay circuit, so that the energy storage unit discharges within the preset time and thereby controls the fan controller to power off.

19. The fan control method according to claim 15, wherein: Also includes: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the fan controller is reset to trigger the fan controller to re-regulate the rotation speed of the fan.

20. The fan control method according to claim 19, wherein: Before resetting the fan controller to trigger the fan controller to re-regulate the speed of the fan, the method further includes: When the second voltage output by the power supply unit is less than the threshold voltage of the fan controller, it is determined that the first voltage drops to the first preset voltage and / or the second voltage drops to the second preset voltage, and the step of resetting the fan controller is entered to trigger the fan controller to re-regulate the speed of the fan.

21. The fan control method according to claim 20, wherein: The undervoltage detection circuit in the fan control system includes a sampling circuit and a comparison circuit for detecting a threshold voltage of the fan controller, the detection circuit is connected to a first input terminal of the comparison circuit, and the sampling circuit is connected to a second input terminal of the comparison circuit; The method further comprises: Comparing the voltage value of the first input terminal with the voltage value of the second input terminal through the comparison circuit; When the voltage value of the first input terminal is less than the voltage value of the second input terminal, determining that the second voltage output by the power supply unit is less than the threshold voltage of the fan controller; When the voltage value of the first input terminal is not less than the voltage value of the second input terminal, it is determined that the second voltage output by the power supply unit is not less than the threshold voltage of the fan controller.

22. The fan control method according to claim 21, wherein: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, resetting the fan controller to trigger the fan controller to re-regulate the speed of the fan includes: When it is determined that the voltage value of the first input terminal is less than the voltage value of the second input terminal, the comparison circuit is triggered to output a reset signal to the fan controller to reset the fan controller, thereby triggering the fan controller to readjust the speed of the fan.

23. The fan control method according to claim 15, wherein: After obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, the method further includes: When the first difference is greater than the first threshold, determining that the first voltage drops to a first preset voltage; and / or When the second difference is greater than the second threshold, it is determined that the second voltage drops to a second preset voltage.

24. The fan control method according to claim 15, wherein: After obtaining the first voltage of the AC power supply and / or the second voltage output by the power supply unit, the method further includes: Perform filtering processing on the first voltage and / or the second voltage.

25. The fan control method according to claim 15, wherein: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, controlling the mainboard to continuously output a closing signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and then controls the fan controller to power off, including: When the duration of the first voltage dropping to the first preset voltage and / or the second voltage dropping to the second preset voltage reaches a time threshold, the mainboard is controlled to continuously output a closing signal for a preset time to the overcurrent protection switch, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

26. The fan control method according to any one of claims 15 to 25, characterized in that: When the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, the mainboard is controlled to continuously output a closing signal to the overcurrent protection switch for a preset time, so that the energy storage unit discharges for a preset time and then controls the fan controller to power off, and further includes: When the first voltage is restored and the second voltage is restored, the fan controller is controlled to be powered on again to restart the fan.

27. The fan control method according to claim 26, wherein: When the first voltage is restored and the second voltage is restored, controlling the fan controller to be powered on again to restart the fan includes: When the first voltage is restored and the second voltage is restored, the fan controller is controlled to be powered on again with a delay to restart the fan.

28. A fan control device, characterized in that: A fan control system as claimed in any one of claims 1 to 13, comprising: A voltage acquisition unit, used for acquiring a first voltage of the AC power supply and / or a second voltage output by the power supply unit during the rotation of the fan; A control unit is used to control the mainboard to continuously output a closing signal to the overcurrent protection switch for a preset time when the first voltage drops to a first preset voltage and / or the second voltage drops to a second preset voltage, so that the energy storage unit discharges for a preset time and thereby controls the fan controller to power off.

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