Continuous-flow control method for dual-power-supply switching water pump and liquid cooling system

Abstract

The embodiment of the invention provides a dual-power-supply switching water pump continuous-current control method and a liquid cooling system.The dual-power-supply switching water pump continuous-current control method is applied to a water pump control system, and the water pump control system comprises a main and standby power supply module, a frequency converter connected with the main and standby power supply module, a water pump connected with the frequency converter and a main control board; the main control board comprises a first communication connection mode connected with the frequency converter through a terminal and a second communication connection mode connected with the frequency converter through a serial port communication interface; the method comprises the following steps: when the main / standby power supply module performs main / standby power supply switching through the automatic change-over switch, the main control board keeps sending a start control instruction to the frequency converter through the first communication connection mode, and sends a frequency control instruction to the frequency converter through the second communication connection mode.

Description

Technical Field

[0001] The present application relates to the field of liquid cooling technology, and in particular to a dual-power switching water pump uninterrupted flow control method and a liquid cooling system. Background Art

[0002] As the computing power of GPU (graphics processing unit) computing servers increases, the heat generated by the servers also increases dramatically. Therefore, a new challenge is posed to the liquid-cooled CDU (cold distribution unit). When the dual power supply of the unit is switched, the cold source for cooling the server cannot be interrupted.

[0003] It is currently known that when the dual power supply of the liquid-cooled CDU is switched, the load water pump will quickly lower the bus voltage of the inverter and the water pump will stop, which will directly lead to the interruption of the cold source in the secondary side pipeline, and ultimately cause the server temperature to rise too high, which may cause irreparable losses to data centers with high computing power. Summary of the invention

[0004] The present application provides a dual power switching water pump non-stop flow control method and a liquid cooling system which can effectively avoid water pump shutdown during dual power switching to improve the flow stability of a secondary side cold source.

[0005] In a first aspect of the present application, a method for controlling a water pump without interrupting flow by switching a dual power supply is provided, which is applied to a water pump control system, wherein the water pump control system comprises a main and standby power supply module, a frequency converter connected to the main and standby power supply module, a water pump connected to the frequency converter, and a main control board, wherein the main control board comprises a first communication connection mode connected to the frequency converter through a terminal and a second communication connection mode connected through a serial communication interface; the method comprises:

[0006] When the main and standby power supply modules perform main and standby power supply switching through the automatic switching switch, the main control board keeps sending startup control instructions to the inverter through the first communication connection mode, and sends frequency control instructions to the inverter through the second communication connection mode.

[0007] In a second aspect of the present application, a liquid cooling system is provided, comprising a main and standby power supply module, a frequency converter connected to the main and standby power supply module, a water pump and a main control board connected to the frequency converter, wherein the main control board comprises a first communication connection mode connected to the frequency converter through a terminal and a second communication connection mode connected through a serial communication interface;

[0008] Among them, the main control board is used to execute the dual power switching water pump uninterrupted flow control method described in any embodiment of the present application.

[0009] The above-mentioned embodiment of the present application provides a method for controlling the uninterrupted flow of a water pump by switching between dual power supplies. The main control board includes a first communication connection mode connected to the frequency converter through a terminal and a second communication connection mode connected through a serial communication interface. When the main and standby power modules switch between the main and standby power supplies through the automatic switching switch, the main control board maintains the first communication connection mode connected through the terminal to send a start control instruction to the frequency converter, and sends a frequency control instruction to the frequency converter by the second communication connection mode connected through the serial communication interface. In this way, the response speed of the start and stop control of the frequency converter can be improved, which is beneficial to the rapid recovery of the bus voltage of the frequency converter during the dual power switching process. The frequency converter can maintain non-stop operation before power supply is restored, and the water pump can also maintain non-stop operation, so that the secondary side cold source flow rate can be stabilized above the target ratio to meet the uninterrupted flow requirement.

[0010] The liquid cooling system provided in the above embodiment belongs to the same concept as the corresponding embodiment of the power switching water pump non-stop flow control method, and thus has at least the same technical effect as the corresponding embodiment of the power switching water pump non-stop flow control method, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a diagram of optional application scenarios of a method for controlling non-stop flow of a water pump using dual power switching in one embodiment.

[0012] Figure 2 This is a flow chart of a method for controlling a water pump without interrupting flow by switching between dual power supplies in one embodiment.

[0013] Figure 3 Schematic diagram of the structure of a liquid cooling system in one embodiment.

[0014] Figure 4 Schematic diagram of a water pump control circuit in one embodiment. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0016] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0017] In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments. It should be noted that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may 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 may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "inside", "outside", "left", "right" and similar expressions used herein are only for the purpose of explanation in conjunction with the embodiments of the accompanying drawings and do not represent the only implementation method.

[0019] The water pump control system in the present application may include, but is not limited to: a water circulation system that recycles used water after treatment, a liquid cooling system that circulates coolant to dissipate heat, and other systems that include a water pump for fluid transportation. Of course, in the following embodiments, the specific form of the water pump control system is not limited.

[0020] See also Figure 1 , which is an optional application scenario diagram of a dual power supply switching water pump non-stop flow control method provided in an embodiment of the present application. The dual power supply switching water pump non-stop flow control method can be typically applied to a liquid cooling system powered by dual power supplies, and the liquid cooling system includes a main and standby power supply module 11 including a main power supply and a standby power supply, a circulating water pump 13, a frequency converter 15 connected to the circulating water pump 13, and a main control board 16 for controlling the frequency converter 15. There are two communication connection modes between the main control board 16 and the frequency converter 15, namely, a terminal connection and a serial communication interface connection. During operation, the liquid cooling system automatically selects a main power supply or a standby power supply that can meet the current power supply requirements to supply power according to the power supply capacity status of the main power supply and the standby power supply. For example, when the main power supply fails, it will automatically switch to the standby power supply to ensure the continuous power supply of the load (such as a water pump), and when the power supply capacity of the main power supply is restored, it will automatically switch back to the main power supply again to maintain the normal power supply state of the main power supply supplying power to the load. In this way, the main and standby power supply switching includes the process of switching from the main power supply to the standby power supply and the process of switching from the standby power supply back to the main power supply. When the main and standby power supplies are switched, the main control board 16 executes the dual power switching water pump uninterrupted flow control method provided in the embodiment of the present application, and keeps sending start control instructions and frequency control instructions to the inverter 15 through the terminal connection and the serial communication interface connection with the inverter 15, so as to improve the response speed of the start and stop control of the inverter 15, which is beneficial to the rapid recovery of the bus voltage of the inverter 15 during the dual power switching process. The inverter 15 can maintain non-stop operation before power supply is restored, and the water pump can be kept running, so that the secondary side cold source flow can be stabilized above the target ratio, meeting the uninterrupted flow requirement, so as to avoid the problem of abnormal server temperature that may be caused when the main and standby power supplies are switched.

[0021] See also Figure 2, is a flow chart of a dual power switching water pump uninterrupted flow control method provided by an embodiment, the dual power switching water pump uninterrupted flow control method can be but is not limited to being applied to Figure 1 For ease of description and understanding, the communication connection mode between the main control board 16 and the inverter 15 through the terminal connection is referred to as the first communication connection mode 151, and the communication connection mode between the main control board 16 and the inverter 15 through the serial communication connection is referred to as the second communication connection mode 152. The dual power switching water pump uninterrupted flow control method includes:

[0022] S11, when the main and standby power supply modules perform main and standby power supply switching through the automatic switching switch, the main control board keeps sending startup control instructions to the inverter through the first communication connection mode, and sends frequency control instructions to the inverter through the second communication connection mode.

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

[0024] Terminal connection refers to the traditional analog and switch input / output method, which is a communication connection method realized by physical terminals provided on the inverter 15. Serial communication connection refers to the communication connection method realized by a communication interface equipped on the inverter 15 that supports communication connection with a preset communication protocol, such as an RS485 communication interface and a communication interface that supports communication with the Mudbus-RTU communication protocol.

[0025] In the above embodiment, when the main and standby power supply module 11 switches the main and standby power supplies through the automatic switching switch 12, the main control board 16 maintains the first communication connection mode 151 connected through the terminal to send a start control instruction to the inverter 15, and sends a frequency control instruction to the inverter 15 through the second communication connection mode 152 connected through the serial communication interface. In this way, on the one hand, the terminal control with higher reliability and stability is used to control the start and stop of the inverter 15. During the switching process of the main and standby power supplies, 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 that is more conducive to remote monitoring and centralized management is used to control the frequency regulation of the inverter 15. During the switching process of the main and standby power supplies, the frequency increase speed and voltage recovery speed of the inverter 15 can be adjusted, so that the inverter 15 can maintain non-stop before the power supply is restored, and the water pump can be stopped, so that the secondary side cold source flow can be stabilized above the target ratio to meet the requirement of continuous 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 standby power supply modules switch between the main and standby power supplies through the automatic switching switch, the main control board controls the inverter to enable the kinetic energy recovery device through the second communication connection method, so that the inverter converts the energy generated by decelerating the water pump motor into recovered kinetic energy through the kinetic energy recovery device, and uses the recovered kinetic energy to maintain the bus voltage of the inverter.

[0028] Among them, the inverter 15 can select a known model inverter 15 with kinetic energy recovery function, such as Huichuan MD290 series inverter 15. The function recovery function of the inverter 15 means that during the switching process of the main and standby power supplies, there will be a momentary short-term power outage. At this time, the water pump motor is in a rapid deceleration stage, and the water pump motor will generate reverse electromotive force. The inverter 15 is provided with a kinetic energy recovery device. By turning on the kinetic energy recovery function, the excess energy generated by the motor deceleration can be fed back to the inverter 15 power grid to maintain the bus voltage of the inverter 15 and supplement the power consumption of the momentary power outage.

[0029] In the above embodiment, by selecting the inverter 15 with kinetic energy recovery function, the main controller can control the kinetic energy recovery function configuration of the inverter 15 to be turned on when the main and standby power supplies are switched, so as to use the kinetic energy recovery function of the inverter 15 to recover kinetic energy for constant control of the bus voltage, and the inverter 15 does not stop when the power supply is momentarily stopped, and a start control instruction is issued through the communication connection method connected through the terminals to quickly restore the power supply for a regulation.

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

[0031] After the kinetic energy recovery device is enabled, the main control board adjusts the undervoltage point of the bus voltage of the inverter to lower it, and / or the main control board sends the frequency control instruction through the second communication connection mode to increase the frequency increase rate of the inverter.

[0032] In this embodiment, the main controller can control the kinetic energy recovery function of the inverter 15 to be turned on when the main and standby power supplies are switched, and also includes configuration adjustment of relevant parameters. The main controller can lower the undervoltage point of the bus voltage of the inverter 15, and can keep sending frequency control instructions to the inverter 15 through the serial communication connection to increase the frequency increase rate of the inverter 15. In an optional example, the undervoltage point of the bus voltage is lowered to 280V, and the frequency increase rate is increased to 50HZ / S to avoid the bus voltage reporting a low voltage fault and shutting down during the main and standby power supply switching process, so that the bus voltage of the inverter 15 can be more stably maintained in the power supply instantaneous stop without stopping, 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 plate, and the dual power switching water pump uninterrupted flow control method further includes:

[0034] When the main and standby power supply modules perform main and standby power supply switching through the automatic switching switch, the capacitor plate releases electrical energy to maintain the bus voltage of the inverter.

[0035] The inverter 15 can store energy by increasing the capacitance through an external capacitor plate. When the main power supply is switched to the standby power supply, the energy stored in the capacitor can be used to maintain the consumption of the inverter 15 at the moment of power failure.

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

[0037] When the main and standby power supply modules switch the main and standby power supplies through the automatic switching switch, the water pump shutdown condition is detected;

[0038] When the water pump shutdown condition is met, the main control board sends a switch control instruction to the switch circuit to control the switch circuit to switch the variable frequency operation state in which the water pump is connected to the inverter to the industrial frequency operation state in which the water pump is connected to the industrial frequency circuit.

[0039] Among them, by designing the industrial frequency circuit, when the main and standby power supplies are switched, at the moment of power outage, the water pump is switched from the variable frequency operation state to the industrial frequency operation state through the control of the switching circuit to maintain the water pump without stopping, so that the secondary side cold source flow can be stabilized above the target ratio to meet the continuous flow requirement.

[0040] Optionally, the water pump shutdown condition includes at least one of the following: the bus voltage of the inverter 15 is lower than the undervoltage point; the inverter 15 is in a fault state. In the embodiment of designing the power frequency circuit, before the main control board 16 switches the water pump from the variable frequency operation state to the power frequency operation state, it detects whether the water pump shutdown condition is currently met to improve the orderliness of the control and the control accuracy when the main and standby power supplies are switched.

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

[0042] When the main and standby power supply modules switch the main and standby power supplies through the automatic switching switch, detecting the state of the main frequency converter;

[0043] If a failure of the main inverter is detected, control is switched to the standby inverter.

[0044] By designing a backup inverter, the main control board 16 can detect the state of the main inverter. When a fault in the main inverter is detected, the control board 16 switches to the backup inverter to avoid the pump shutdown and flow interruption caused by the inverter 15 state fault. The control circuit design for the main inverter and the backup inverter can be the same, such as Figure 4 As shown, the main inverter and the standby inverter are inverter 1 and inverter 2 respectively, inverter 1 corresponds to water pump PUMP1, and inverter 2 corresponds to water pump PUMP2. In the dual-power switching water pump uninterrupted flow control method provided in the embodiment of the present application, the control of inverter 15 is applicable to both the main inverter and the standby inverter, which will not be repeated here.

[0045] In some embodiments, the switch 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 static contacts are connected to the frequency converter 15 and the main and standby power supply module 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 industrial frequency circuit respectively.

[0048] Among them, the main control board 16 will use the switch circuit to form an overall control for the switching control of the water pump from the variable frequency operation state to the industrial frequency operation state, and the switching control between the main frequency converter and the standby frequency converter. At the moment of dual power switching, the water pump is switched from the variable frequency operation to the industrial frequency operation through the relay in the switch circuit. When the main frequency converter fails, the water pump is switched from the main frequency converter control to the standby frequency converter control, so as to form a more complete and effective control scheme to prevent the water pump from shutting down and interrupting the flow. It should be noted that in the embodiment including both the main frequency converter and the standby frequency converter, the description of the switch circuit here is explained by taking the control circuit of the main frequency converter as an example, such as Figure 4 As shown, in the control circuit of the standby inverter, the first relay in the switch 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 standby power supply modules switch between the main and standby power supplies through the automatic switching switch, the main control board selects the heavy load power of the inverter according to the power of the water pump, and sends a frequency control instruction to the inverter through the second communication connection method to adjust the output power of the inverter.

[0051] Heavy-load power refers to the power at which the inverter 15 can work stably under high load. The heavy-load power of the inverter 15 is selected according to the power of the water pump, so that when the water pump is frequently started, the inverter 15 has higher output power and torque characteristics to meet the high power demand and large starting torque of the load.

[0052] In order to have a more comprehensive understanding of the dual power switching water pump uninterrupted flow control method provided in the embodiment of the present application, the following is an example of a liquid cooling system as a liquid cooling CDU device. The main control board 16 is connected to the DI port and the serial communication interface of the inverter 15 respectively. The main control board 16 uses the DI port to send start and stop control instructions for the start control of the inverter 15, and uses the RS485 communication interface to send frequency control instructions for the frequency of the inverter 15. The dual power switching water pump uninterrupted flow control method includes the following improvements:

[0053] First, when the ATS is switched, the main control board 16 keeps sending start and stop control instructions to the inverter 15 through the DI port, and sends frequency control instructions through the serial communication interface.

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

[0055] In an optional example, the main control board 16 turns on the configuration of the kinetic energy recovery function of the inverter 15, and the relevant parameter configuration includes: selecting the instantaneous stop and stop function of the inverter 15 as constant bus voltage control, adjusting the instantaneous stop and stop recovery voltage to 85%, adjusting the instantaneous stop and stop action voltage to 70%, changing the undervoltage point to 280V, and adjusting the frequency increase rate to 50HZ / S. The instantaneous stop and stop function causes a short power outage at the moment of ATS switching. The inverter 15 is in the power generation state, so that the bus voltage is maintained at the voltage corresponding to the instantaneous stop and stop action, so that the inverter 15 will not shut down because the bus voltage is lower than the undervoltage point and reports an undervoltage fault. If undervoltage is still reported, the instantaneous stop and stop gain Kp and the instantaneous stop and stop integral coefficient Ki can be increased.

[0056] Third, the capacitor plate of the frequency converter 15 is expanded externally to increase the capacitor to store electrical energy. At the moment of power failure during ATS switching, the power of the capacitor is used to maintain the consumption of the frequency converter 15.

[0057] Fourth, add an industrial frequency circuit. At the moment of power failure during ATS switching, the water pump will be switched from variable frequency operation to industrial frequency operation according to the currently detected water pump shutdown conditions.

[0058] The dual power switching water pump non-stop flow control method provided in the above embodiment, the control mode of the inverter 15 is terminal command control of the inverter 15 start and stop and RS485 communication sending frequency, compared with only RS485 communication control, the inverter 15 start and stop faster, which is effective for the rapid recovery of the bus voltage; when the ATS is switched, the kinetic energy recovery function of the inverter 15 is controlled to be enabled, so that the bus voltage of the inverter 15 can be stabilized above the undervoltage point, avoiding the inverter 15 shutdown from causing a significant impact on the unit cold source flow; the use of terminal sending start and stop control and RS485 sending frequency control is conducive to the rapid recovery of the current voltage after the inverter 15 is powered on again, so as to maintain the stability of the cold source flow and meet the demand for non-stop flow. Based on this, the dual power switching water pump non-stop flow control method provided in the embodiment of the present application can be used according to the different requirements for the unit cold source flow after the dual power switching, so that the unit cold source flow after the dual power switching under various working conditions from low load to full load will not be less than 80%, and the purpose of non-stop flow of the water pump during the dual power switching process can be achieved.

[0059] On the other hand, the present application further provides a liquid cooling system, including a main-standby power supply module 11, a frequency converter 15 connected to the main-standby power supply module 11, a water pump connected to the frequency converter 15, and a main control board 16, wherein the main control board 16 includes a first communication connection mode 151 connected to the frequency converter 15 through a terminal and a second communication connection mode 152 connected through a serial communication interface; wherein the main control board 16 is used to execute the dual power supply switching water pump non-stop flow control method described in the embodiment of the present application.

[0060] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0061] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling the flow of a water pump without interruption when switching between dual power supplies, applied to a water pump control system, characterized in that: The water pump control system comprises a main and standby power supply module, a frequency converter connected to the main and standby power supply module, a water pump and a main control board connected to the frequency converter, wherein the main control board comprises a first communication connection mode connected to the frequency converter through a terminal and a second communication connection mode connected through a serial communication interface; the method comprises: When the main and standby power supply modules perform main and standby power supply switching through the automatic switching switch, the main control board keeps sending startup control instructions to the inverter through the first communication connection mode, and sends frequency control instructions to the inverter through the second communication connection mode.

2. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 1, characterized in that: The frequency converter includes a kinetic energy recovery device, and the method further includes: When the main and standby power supply modules switch between the main and standby power supplies through the automatic switching switch, the main control board controls the inverter to enable the kinetic energy recovery device through the second communication connection method, so that the inverter converts the energy generated by decelerating the water pump motor into recovered kinetic energy through the kinetic energy recovery device, and uses the recovered kinetic energy to maintain the bus voltage of the inverter.

3. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 2, characterized in that: The method further comprises: After the kinetic energy recovery device is enabled, the main control board adjusts the undervoltage point of the bus voltage of the inverter to lower it, and / or the main control board sends the frequency control instruction through the second communication connection mode to increase the frequency increase rate of the inverter.

4. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 1, characterized in that: The frequency converter includes a capacitor plate, and the method further includes: When the main and standby power supply modules perform main and standby power supply switching through the automatic switching switch, the capacitor plate releases electrical energy to maintain the bus voltage of the inverter.

5. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 1, characterized in that: The water pump control system further includes an industrial frequency circuit and a switch circuit, wherein the switch circuit is used to switch the frequency converter and the industrial frequency circuit; the method further includes: When the main and standby power supply modules switch the main and standby power supplies through the automatic switching switch, the water pump shutdown condition is detected; When the water pump shutdown condition is met, the main control board sends a switch control instruction to the switch circuit to control the switch circuit to switch the variable frequency operation state in which the water pump is connected to the inverter to the industrial frequency operation state in which the water pump is connected to the industrial frequency circuit.

6. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 5, characterized in that: The water pump shutdown condition includes at least one of the following: The bus voltage of the inverter is lower than the undervoltage point; The frequency converter is in a fault state.

7. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 5, 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 standby power supply modules switch the main and standby power supplies through the automatic switching switch, detecting the state of the main frequency converter; If a fault in the main inverter is detected, control is switched to the standby inverter.

8. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 7, characterized in that: The switch 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 static contacts are respectively connected to the frequency converter and the main and standby power supply modules; The moving contact of the second relay is connected to the water pump, and the two static contacts are respectively connected to the frequency converter and the industrial frequency circuit.

9. The method for controlling the water pump without interruption of flow by switching between dual power supplies according to claim 1, characterized in that: The method further comprises: When the main and standby power supply modules switch between the main and standby power supplies through the automatic switching switch, the main control board selects the heavy load power of the inverter according to the power of the water pump, and sends a frequency control instruction to the inverter through the second communication connection method to adjust the output power of the inverter.

10. A liquid cooling system, characterized in that: It includes a main and standby power supply module, a frequency converter connected to the main and standby power supply module, a water pump and a main control board connected to the frequency converter, wherein the main control board includes a first communication connection mode connected to the frequency converter through a terminal and a second communication connection mode connected through a serial communication interface; Wherein, 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 9.

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