Dual-power switching water pump uninterrupted flow control method and liquid cooling system

Abstract

This application provides a dual-power switching water pump uninterrupted flow control method and a liquid cooling system. The dual-power switching water pump uninterrupted flow control method is applied to a water pump control system, which includes a main and backup power module, a frequency converter connected to the main and backup power module, a water pump connected to the frequency converter, and a main control board. The main control board includes a first communication connection method connected to the frequency converter via terminals and a second communication connection method connected via a serial communication interface. The method includes: when the main and backup power modules switch between main and backup power via an automatic switching switch, the main control board continues to send start control commands to the frequency converter via the first communication connection method and frequency control commands to the frequency converter via the second communication connection method.

Description

Technical Field

[0001] This application relates to the field of liquid cooling technology, and in particular to a method for controlling a dual-power switching water pump without interruption of flow and a liquid cooling system. Background Technology

[0002] As GPU (Graphics Processing Unit) computing servers become increasingly powerful, the heat generated by these servers also increases dramatically. This presents new challenges for liquid-cooled CDUs (Cooling Distribution Units), ensuring that the cooling source for the servers remains uninterrupted during dual power supply switching.

[0003] Currently known liquid-cooled CDUs experience a rapid drop in inverter bus voltage during dual-power switching, causing the pumps to stop. This directly leads to a break in the cooling supply to the secondary side pipes, ultimately resulting in excessive server temperature rise. This could cause irreparable damage to high-performance data centers. Summary of the Invention

[0004] This application provides a method and liquid cooling system for controlling a water pump that does not stop flowing during dual power supply switching, thereby improving the stability of the secondary side cold source flow.

[0005] In a first aspect, this application provides a dual-power switching water pump uninterrupted flow control method, applied to a water pump control system. The water pump control system includes a main and backup power module, a frequency converter connected to the main and backup power module, a water pump connected to the frequency converter, and a main control board. The main control board includes a first communication connection method connected to the frequency converter via terminals and a second communication connection method connected via a serial communication interface. The method includes:

[0006] When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board continues to send start control commands to the frequency converter through the first communication connection method and frequency control commands to the frequency converter through the second communication connection method.

[0007] In a second aspect, this application provides a liquid cooling system, including a main and backup power module, a frequency converter connected to the main and backup power module, a water pump connected to the frequency converter, and a main control board. The main control board includes a first communication connection method connected to the frequency converter via terminals and a second communication connection method connected via a serial communication interface.

[0008] The main control board is used to execute the dual-power switching water pump uninterrupted flow control method described in any embodiment of this application.

[0009] The dual-power switching water pump uninterrupted flow control method provided in the above embodiments of this application includes a main control board with a first communication connection to the frequency converter via terminals and a second communication connection via a serial communication interface. When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board maintains the first communication connection via terminals to send start control commands to the frequency converter, and sends frequency control commands to the frequency converter via the second communication connection via the serial communication interface. This improves the response speed of the frequency converter's start and stop control, facilitates the rapid recovery of the frequency converter's bus voltage during dual-power switching, and ensures that the frequency converter and water pump remain running until power is restored. This allows the secondary side cold source flow rate to remain stable above the target ratio, meeting the requirement of uninterrupted flow.

[0010] The liquid cooling system provided in the above embodiments belongs to the same concept as the corresponding power switching water pump uninterrupted flow control method embodiments, and thus has at least the same technical effect as the corresponding power switching water pump uninterrupted flow control method embodiments, which will not be repeated here. Attached Figure Description

[0011] Figure 1 This is a diagram illustrating an optional application scenario of the dual-power switching water pump uninterrupted flow control method in one embodiment.

[0012] Figure 2 This is a flowchart of a dual-power switching water pump uninterrupted flow control method in one embodiment.

[0013] Figure 3 This is a schematic diagram of the liquid cooling system in one embodiment.

[0014] Figure 4 This is a circuit diagram of a water pump control circuit in one embodiment. Detailed Implementation

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the following description, the phrase "some embodiments" refers to a subset of all possible embodiments. It should be noted that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0018] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only in conjunction with the embodiments in the accompanying drawings and do not represent the only possible implementations.

[0019] The water pump control system in this application may include, but is not limited to, various systems that involve water pumps for fluid transport, such as water circulation systems that treat and recycle used water, and liquid cooling systems that utilize coolant circulation for heat dissipation. Of course, the specific form of the water pump control system is not limited in the following embodiments.

[0020] Please see Figure 1 This diagram illustrates an optional application scenario of a dual-power switching water pump uninterrupted flow control method provided in an embodiment of this application. This method can be typically applied to a liquid cooling system powered by two power supplies. The liquid cooling system includes a main / backup power supply module 11 comprising a main power supply and a backup power supply, a circulating water pump 13, a frequency converter 15 connected to the circulating water pump 13, and a main control board 16 controlling the frequency converter 15. The main control board 16 and the frequency converter 15 are connected via two communication methods: terminal connection and serial communication interface connection. During operation, the liquid cooling system automatically selects the main power supply or the backup power supply that meets the current power requirements based on the power supply capacity of the main power supply and the backup power supply. For example, when the main power supply fails, it automatically switches to the backup power supply to ensure continuous power supply to the load (such as the water pump). When the main power supply capacity is restored, it automatically switches back to the main power supply to maintain the normal power supply state of supplying power to the load using the main power supply. Thus, the main / backup power supply switching includes the process of switching from the main power supply to the backup power supply and the process of switching back from the backup power supply to the main power supply. During the switching of primary and backup power, the main control board 16 executes the dual-power switching water pump uninterrupted flow control method provided in this application embodiment. It sends start control commands and frequency control commands to the frequency converter 15 through the terminal connection and serial communication interface connection with the frequency converter 15, respectively. This improves the response speed of the start and stop control of the frequency converter 15, which is conducive to the rapid recovery of the bus voltage of the frequency converter 15 during the dual-power switching process. The frequency converter 15 can remain running before the power supply is restored, and the water pump can remain running. This ensures that the secondary side cold source flow can be stabilized above the target ratio, meeting the uninterrupted flow requirement and avoiding the server temperature abnormality problem that may occur during the switching of primary and backup power.

[0021] Please see Figure 2This is a flowchart of a dual-power switching water pump uninterrupted flow control method according to one embodiment. This dual-power switching water pump uninterrupted flow control method can be applied to, but is not limited to, [examples of applications]. Figure 1 The liquid cooling system is shown. For ease of description and understanding, the communication connection between the main control board 16 and the frequency converter 15 via terminals is referred to as the first communication connection method 151, and the communication connection between the main control board 16 and the frequency converter 15 via serial communication is referred to as the second communication connection method 152. This dual-power switching water pump uninterrupted flow control method includes:

[0022] S11, when the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board continues to send start control commands to the frequency converter through the first communication connection method and frequency control commands to the frequency converter through the second communication connection method.

[0023] Please refer to the following: Figure 3 The frequency converter 15 is connected to the main and backup power modules 11 via an automatic transfer switch 12 (ATS). The automatic transfer switch 12 automatically switches between the main power and backup power according to the power supply capacity status of the main power and backup power to ensure continuous power supply to the load in the liquid cooling system.

[0024] Terminal connection refers to the traditional analog and digital input / output methods, which are communication connections implemented through physical terminals on the inverter 15. Serial communication connection refers to the communication connection method implemented through a communication interface on the inverter 15 that supports communication connections using preset communication protocols, such as an RS485 communication interface or a communication interface that supports communication using the Mudbus-RTU communication protocol.

[0025] In the above embodiments, when the main and backup power modules 11 switch between main and backup power through the automatic switching switch 12, the main control board 16 maintains the first communication connection 151 connected via terminals to send start control commands to the inverter 15, and sends frequency control commands to the inverter 15 through the second communication connection 152 connected via the serial communication interface. In this way, on the one hand, the terminal control, which has higher reliability and stability, is used to control the start and stop of the inverter 15. During the main and backup power switching process, the response speed of the start and stop control of the inverter 15 can be improved, which is conducive to the rapid recovery of the bus voltage of the inverter 15 during the dual power switching process. On the other hand, the serial communication interface, which is more conducive to remote monitoring and centralized management, is used to control the frequency of the inverter 15. During the main and backup power switching process, the frequency ramp-up speed and voltage recovery speed of the inverter 15 can be adjusted, so that the inverter 15 can remain running without stopping before the power supply is restored, and the water pump can remain running without stopping. This ensures that the secondary side cold source flow can be stabilized above the target ratio, meeting the requirement of uninterrupted flow.

[0026] In some embodiments, the frequency converter 15 includes a kinetic energy recovery device, and the method further includes:

[0027] When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board controls the frequency converter to enable the kinetic energy recovery device through the second communication connection method, so that the frequency converter can recover the energy generated by the deceleration of the water pump motor through the kinetic energy recovery device, and use the recovered kinetic energy to maintain the bus voltage of the frequency converter.

[0028] Among them, inverter 15 can be a known model inverter 15 with kinetic energy recovery function, such as Huichuan MD290 series inverter 15. The kinetic energy recovery function of inverter 15 refers to the fact that during the switching of main and standby power supplies, there will be a momentary short power outage. At this time, the water pump motor is in the rapid deceleration stage, and the water pump motor will generate a back electromotive force. Inverter 15 is equipped with a kinetic energy recovery device. By activating the kinetic energy recovery function, the excess energy generated by the motor deceleration can be fed back to the power grid of inverter 15 to maintain the bus voltage of inverter 15 and make up for the power consumption of the momentary power outage.

[0029] In the above embodiment, by selecting a frequency converter 15 with kinetic energy recovery function, the main controller can control the frequency converter 15 to be configured to turn on the kinetic energy recovery function when switching between main and standby power supplies. The kinetic energy recovery function of the frequency converter 15 is used to recover kinetic energy for constant bus voltage control. The power supply stops momentarily but the frequency converter 15 does not stop. The power supply is quickly restored by issuing start control commands through the communication connection via the terminal connection.

[0030] Optionally, the dual-power switching water pump uninterrupted flow control method further includes:

[0031] After the kinetic energy recovery device is activated, the main control board adjusts the undervoltage point of the inverter's bus voltage to reduce it, and / or the main control board issues the frequency control command through the second communication connection to increase the inverter's frequency ramp-up rate.

[0032] In this embodiment, the main controller can enable the kinetic energy recovery function of the inverter 15 during the main / standby power supply switchover, and also adjust relevant parameters. The main controller can lower the undervoltage point of the inverter 15's bus voltage and continuously send frequency control commands to the inverter 15 via serial communication to increase the inverter 15's frequency ramp-up rate. In an optional example, the undervoltage point of the bus voltage is lowered to 280V, and the frequency ramp-up rate is increased to 50Hz / s to avoid the inverter shutting down due to a low-voltage fault during the main / standby power supply switchover. This allows the inverter 15's bus voltage to be maintained more stably during power supply interruptions without interruption, which is more conducive to improving the voltage recovery rate of the inverter 15.

[0033] In some embodiments, the frequency converter 15 includes a capacitor board, and the dual-power switching water pump uninterrupted flow control method further includes:

[0034] When the main and backup power modules switch between main and backup power through an automatic switching switch, the capacitor plate releases electrical energy to maintain the bus voltage of the frequency converter.

[0035] Among them, the frequency converter 15 can increase the capacitor for energy storage by expanding the capacitor plate. When the main power supply switches, the energy stored in the capacitor can maintain the consumption of the frequency converter 15 during the moment of power failure.

[0036] In some embodiments, please refer to Figure 2 and Figure 4 The liquid cooling system further includes a power frequency circuit and a switching circuit, the switching circuit being used to switch between the frequency converter 15 and the power frequency circuit; the dual-power switching water pump uninterrupted flow control method further includes:

[0037] When the main and backup power modules switch between main and backup power through an automatic switching switch, the pump shutdown conditions are detected.

[0038] When the water pump shutdown condition is met, the main control board sends a switch control command to the switch circuit to control the switch circuit to switch the water pump from the inverter operation state to the power frequency operation state when the water pump is connected to the power frequency circuit.

[0039] By designing a power frequency circuit, during the power outage moment when the main and backup power supplies are switched, the water pump is switched from variable frequency operation to power frequency operation through the control of the switching circuit to keep the water pump running continuously, so that the secondary side cold source flow can be stabilized above the target ratio and meet the requirement of uninterrupted flow.

[0040] Optionally, the pump shutdown conditions include at least one of the following: the bus voltage of the frequency converter 15 is lower than the undervoltage point; or the frequency converter 15 is in a fault state. In an embodiment designing a power frequency circuit, before the main control board 16 switches the pump from variable frequency operation to power frequency operation, it checks whether the pump shutdown conditions are met to improve the orderliness of control and the control accuracy during main / standby power supply switching.

[0041] In some embodiments, the frequency converter 15 includes a main frequency converter and a standby frequency converter, and the dual-power switching water pump uninterrupted flow control method further includes:

[0042] When the main and backup power modules switch between main and backup power through an automatic switching switch, the status of the main frequency converter is detected.

[0043] If a fault is detected in the main inverter, the control switches to the standby inverter.

[0044] By designing a backup frequency converter, the main control board 16 can detect the status of the main frequency converter. When a fault is detected in the main frequency converter, it controls the switch to the backup frequency converter to prevent water pump shutdown and flow interruption caused by a fault in frequency converter 15. The control circuit design for the main frequency converter and the backup frequency converter can be the same, such as... Figure 4 As shown, the main frequency converter and the standby frequency converter are frequency converter 1 and frequency converter 2, respectively. Frequency converter 1 corresponds to water pump PUMP1 and frequency converter 2 corresponds to water pump PUMP2. In the dual power switching water pump uninterrupted flow control method provided in this application embodiment, the control of frequency converter 15 is applicable to both the main frequency converter and the standby frequency converter, which will not be described in detail here.

[0045] In some embodiments, the switching circuit includes a first relay KM1 and a second relay KM2;

[0046] The moving contact of the first relay KM1 is connected to the water pump, and the two stationary contacts are connected to the frequency converter 15 and the main and backup power modules 11, respectively.

[0047] The moving contact of the second relay KM2 is connected to the water pump, and the two stationary contacts are connected to the frequency converter 15 and the power frequency circuit, respectively.

[0048] The main control board 16 integrates the switching control of the water pump from variable frequency operation to power frequency operation, and the switching control between the main frequency converter and the standby frequency converter, using a switching circuit to form a unified control system. During the dual power supply switching instant, a relay in the switching circuit switches the water pump from variable frequency operation to power frequency operation. When the main frequency converter fails, the control of the water pump is switched from the main frequency converter to the standby frequency converter, forming a more complete and effective control scheme to prevent water pump shutdown and flow interruption. It should be noted that in embodiments that include both a main frequency converter and a standby frequency converter, the description of the switching circuit here uses the control circuit containing the main frequency converter as an example. Figure 4 As shown, in the control circuit of the standby frequency converter, the first relay in the switching circuit is KM3, and the second relay is KM4.

[0049] In some embodiments, the dual-power switching water pump uninterrupted flow control method further includes:

[0050] When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board selects the heavy-load power of the frequency converter according to the power of the water pump, and sends a frequency control command to the frequency converter through the second communication connection method to adjust the output power of the frequency converter.

[0051] Heavy-load power refers to the power at which the frequency converter 15 can operate stably under high load. The heavy-load power of the frequency converter 15 is selected to correspond to the power of the water pump, so that the frequency converter 15 has higher output power and torque characteristics when the water pump starts frequently, in order to meet the high power requirements and large starting torque of the load.

[0052] To gain a more comprehensive understanding of the dual-power switching water pump uninterrupted flow control method provided in this application embodiment, the following description uses a liquid-cooled CDU device as an example of a liquid-cooled system. The main control board 16 is connected to the DI port and serial communication interface of the frequency converter 15. The main control board 16 controls the start-up of the frequency converter 15 by issuing start-stop control commands through the DI port, and controls the frequency of the frequency converter 15 by issuing frequency control commands through the RS485 communication interface. This dual-power switching water pump uninterrupted flow control method includes the following improvements:

[0053] First, during ATS switching, the main control board 16 continues to send start / stop control commands to the inverter 15 through the DI port and frequency control commands through the serial communication interface.

[0054] Second, the main control board 16 controls the inverter 15 to start the energy recovery function and configures the relevant parameters.

[0055] In an optional example, the main control board 16 enables the kinetic energy recovery function of the inverter 15. The relevant parameter configurations include: selecting the inverter 15's "stop-and-go" function as constant bus voltage control, adjusting the "stop-and-go" recovery voltage to 85%, adjusting the "stop-and-go" action voltage to 70%, changing the undervoltage point to 280V, and adjusting the frequency ramp-up rate to 50Hz / s. The "stop-and-go" function allows the inverter 15 to operate in generator mode during a short power outage when the ATS switches, maintaining the bus voltage at the voltage corresponding to the "stop-and-go" action. This prevents the inverter 15 from shutting down due to an undervoltage fault caused by the bus voltage falling below the undervoltage point. If an undervoltage fault still occurs, the "stop-and-go" gain Kp and integral coefficient Ki can be increased.

[0056] Third, the capacitor board of the external inverter 15 is expanded to increase the capacitor storage of electrical energy. During the power outage in ATS switching, the electrical energy of the capacitor is used to maintain the power consumption of the inverter 15.

[0057] Fourth, add a power frequency circuit so that during the power failure in ATS switching, the water pump can be switched from variable frequency operation to power frequency operation based on the currently detected water pump shutdown conditions.

[0058] The dual-power switching water pump uninterrupted flow control method provided in the above embodiments uses terminal command control for the start / stop of the frequency converter 15 and RS485 communication frequency transmission. Compared to control via RS485 communication alone, the start / stop of the frequency converter 15 is faster and more effective in quickly restoring the bus voltage. During ATS switching, the activation of the kinetic energy recovery function of the frequency converter 15 ensures that the bus voltage of the frequency converter 15 remains stable above the undervoltage point, preventing a significant impact on the unit's cold source flow rate from the frequency converter 15 shutdown. The use of terminal command start / stop control and RS485 frequency transmission facilitates the rapid recovery of the voltage after the frequency converter 15 is powered on again, maintaining a stable cold source flow rate and meeting the uninterrupted flow requirement. Therefore, the dual-power switching water pump uninterrupted flow control method provided in this application embodiment can ensure that the unit's cold source flow rate remains at least 80% under various operating conditions, from low load to full load, according to different requirements for the unit's cold source flow rate after dual-power switching, achieving the goal of uninterrupted water pump flow during dual-power switching.

[0059] In another aspect, this application also provides a liquid cooling system, including a main and backup power module 11, a frequency converter 15 connected to the main and backup power module 11, a water pump connected to the frequency converter 15, and a main control board 16. The main control board 16 includes a first communication connection method 151 connected to the frequency converter 15 via terminals and a second communication connection method 152 connected via a serial communication interface. The main control board 16 is used to execute the dual power switching water pump uninterrupted flow control method described in the embodiments of this application.

[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for controlling a water pump with dual power supply switching and continuous flow, applied to a water pump control system, characterized in that, The water pump control system includes a main and backup power module, a frequency converter connected to the main and backup power module, a water pump connected to the frequency converter, and a main control board. The main control board includes a first communication connection to the frequency converter via terminals and a second communication connection via a serial communication interface. The frequency converter includes a kinetic energy recovery device. The method includes: When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board continues to send start control commands to the frequency converter through the first communication connection method and frequency control commands to the frequency converter through the second communication connection method. Furthermore, when the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board also controls the frequency converter to enable the kinetic energy recovery device through the second communication connection method, so that the frequency converter can recover the energy generated by the deceleration of the water pump motor through the kinetic energy recovery device, and use the recovered kinetic energy to maintain the bus voltage of the frequency converter.

2. The dual-power switching water pump uninterrupted flow control method according to claim 1, characterized in that, The method further includes: After the kinetic energy recovery device is activated, the main control board adjusts the undervoltage point of the inverter's bus voltage to reduce it, and / or the main control board issues the frequency control command through the second communication connection to increase the inverter's frequency ramp-up rate.

3. The dual-power switching water pump uninterrupted flow control method according to claim 1, characterized in that, The frequency converter includes a capacitor board, and the method further includes: When the main and backup power modules switch between main and backup power through an automatic switching switch, the capacitor plate releases electrical energy to maintain the bus voltage of the frequency converter.

4. The dual-power switching water pump uninterrupted flow control method according to claim 1, characterized in that, The water pump control system further includes a power frequency circuit and a switching circuit, the switching circuit being used to switch between the frequency converter and the power frequency circuit; the method further includes: When the main and backup power modules switch between main and backup power through an automatic switching switch, the pump shutdown conditions are detected. When the water pump shutdown condition is met, the main control board sends a switch control command to the switch circuit to control the switch circuit to switch the water pump from the inverter operation state to the power frequency operation state when the water pump is connected to the power frequency circuit.

5. The dual-power switching water pump uninterrupted flow control method according to claim 4, characterized in that, The pump shutdown conditions include at least one of the following: The bus voltage of the frequency converter is lower than the undervoltage point; The frequency converter is malfunctioning.

6. The dual-power switching water pump uninterrupted flow control method according to claim 4, characterized in that, The frequency converter includes a main frequency converter and a standby frequency converter, and the method further includes: When the main and backup power modules switch between main and backup power through an automatic switching switch, the status of the main frequency converter is detected. If a fault is detected in the main frequency converter, the control switches to the backup frequency converter.

7. The dual-power switching water pump uninterrupted flow control method according to claim 6, characterized in that, The switching circuit includes a first relay and a second relay; The moving contact of the first relay is connected to the water pump, and the two stationary contacts are connected to the frequency converter and the main and backup power modules, respectively. The moving contact of the second relay is connected to the water pump, and the two stationary contacts are connected to the frequency converter and the power frequency circuit, respectively.

8. The method for controlling a dual-power switching water pump without interruption of flow according to claim 1, characterized in that, The method further includes: When the main and backup power modules switch between main and backup power through an automatic switching switch, the main control board selects the heavy-load power of the frequency converter according to the power of the water pump, and sends a frequency control command to the frequency converter through the second communication connection method to adjust the output power of the frequency converter.

9. A liquid cooling system, characterized in that, It includes a main and backup power module, a frequency converter connected to the main and backup power module, a water pump connected to the frequency converter, and a main control board. The main control board includes a first communication connection method connected to the frequency converter via terminals and a second communication connection method connected via a serial communication interface. The main control board is used to execute the dual-power switching water pump uninterrupted flow control method as described in any one of claims 1 to 8.

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