Water flow adjusting system, water temperature machine and AC reactive power test system

Abstract

The utility model relates to a water flow adjusting system, a water temperature machine and an AC reactive test system, the water flow adjusting system comprises a controller, a water tank and a plurality of water channel plates used for heat dissipation of power devices, and each water channel plate is connected with the water tank through a corresponding pipeline; a flow meter and a servo pump which are electrically connected with the controller are arranged on each pipeline, and each flow meter is used for detecting the water flow of the corresponding pipeline and outputting a flow detection signal; the controller sends corresponding rotating speed control signals to the servo pumps of the pipelines based on the flow detection signals corresponding to the pipelines so as to adjust the rotating speed of the servo pumps, and the servo pumps are used for driving heat conduction water to be transmitted to the corresponding water channel plates from the water tank through the corresponding pipelines. The problem that a water flow adjusting system cannot accurately adjust and control the water flow of each test station, so that the over-temperature alarm of the power semiconductor module is caused is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor testing, in particular to a water flow regulating system, a water temperature machine and an AC reactive power testing system. Background Art

[0002] AC reactive power testing of power semiconductors simulates actual application scenarios by using high currents and harsh operating conditions to screen for defects in power semiconductors, effectively improving the qualification rate of power semiconductors. The higher the current in the AC reactive power test, the greater the heat generated by the power semiconductor module. While this heat must be quickly dissipated, the module temperature must also be stabilized within a certain range. However, the temperature margin between the module's operating temperature and over-temperature is relatively small, necessitating more precise temperature control for the water temperature controller used to cool the power semiconductor module.

[0003] The water temperature controller in the related art typically uses a high-power water pump controlled by a variable frequency speed regulator to pump water into a main water supply pipe, which is then transported to multiple test stations through multiple pipes. When multiple test stations are tested simultaneously, the water temperature returning to the water tank is relatively high. However, the control method of using a single high-power water pump cannot accurately adjust the water flow to each test station, and cannot accurately control the temperature range of each test station. This often causes overtemperature alarms in the power semiconductor modules, failing to meet the functional requirements of the AC reactive power test system. Utility Model Content

[0004] In view of this, it is necessary to provide a water flow regulation system, a water temperature machine and an AC reactive power test system to solve the problem in the prior art that the water flow of each test station cannot be accurately adjusted and controlled, resulting in an over-temperature alarm of the power semiconductor module.

[0005] In the first aspect, a water flow regulating system is provided in this embodiment.

[0006] The system includes a controller, a water tank, and multiple waterway plates for dissipating heat from power devices. Each of the waterway plates is connected to the water tank via a corresponding pipeline. Each of the pipelines is provided with a flow meter and a servo pump electrically connected to the controller. Each flow meter is used to detect the water flow in the corresponding pipeline and output a flow detection signal.

[0007] Among them, the controller sends a corresponding speed control signal to the servo pump of each pipeline based on the flow detection signal corresponding to each pipeline to adjust the speed of each servo pump. Each servo pump is used to drive the heated water from the water tank through the corresponding pipeline to the corresponding waterway plate.

[0008] In a further embodiment, the pipeline is further provided with a return valve and a pressure sensor electrically connected to the controller, and the pressure sensor is used to detect the water pressure of the pipeline and output a water pressure detection signal;

[0009] The controller sends a corresponding opening adjustment signal to the return valve corresponding to the pipeline based on the water pressure detection signal corresponding to each pipeline to adjust the conduction area of ​​the corresponding return valve. Each return valve is used to control the water flow of the heated water returning to the water tank from the corresponding waterway plate through the corresponding pipeline.

[0010] In a further embodiment, a temperature sensor electrically connected to the controller is further provided on the pipeline, and the temperature sensor is used to detect the water temperature of the pipeline and output a temperature detection signal;

[0011] The controller sends a corresponding speed control signal to the servo pump corresponding to the pipeline based on the flow detection signal and temperature detection signal corresponding to each pipeline; and / or sends a corresponding opening adjustment signal to the return valve corresponding to the pipeline based on the water pressure detection signal and temperature detection signal corresponding to each pipeline.

[0012] In a further embodiment, the pipeline includes a water outlet pipe and a water return pipe, the water outlet pipe transfers the heated water from the water tank to the waterway plate, and the water return pipe transfers the heated water from the waterway plate to the water tank;

[0013] The servo pump, the flow meter and the pressure sensor are sequentially arranged on the water outlet pipe along the water flow direction, and the temperature sensor and the return valve are sequentially arranged on the return pipe along the water flow direction.

[0014] In a further embodiment, the water outlet pipe is further provided with a water outlet valve, and the water outlet valve is arranged between the servo pump and the flow meter to control the water flow of the water outlet pipe.

[0015] In a further embodiment, the water outlet pipe is further provided with an air blowing port, which is arranged after the flow meter and is used to test the air tightness of the water outlet pipe before water is passed.

[0016] In a further embodiment, the pipeline is detachably connected to the waterway plate.

[0017] On the second aspect, a water temperature machine is provided in this embodiment, which includes a heating pipe and a cooler for heating and cooling the hot water, and the water flow regulation system described in the first aspect. The heating pipe and the cooler are both installed in the water tank to adjust the temperature of the hot water in the water tank.

[0018] In a further embodiment, the water temperature controller further includes a water purification system, which is disposed in the water tank and is used to purify the heated water flowing back into the water tank.

[0019] In a third aspect, an AC reactive power test system is provided in this embodiment, characterized in that the AC reactive power test system includes the water temperature machine described in the second aspect, and a plurality of power modules to be tested that dissipate heat through the water temperature machine.

[0020] The water flow regulation system of the present invention comprises a controller, a water tank and a plurality of water channel plates for heat dissipation of power devices, each water channel plate is connected to the water tank through a corresponding pipeline, and each pipeline is provided with a flow meter and a servo pump electrically connected to the controller; the water flow of the corresponding pipeline is detected by the flow meter, and a corresponding flow detection signal is output; the controller adjusts the rotation speed of the corresponding servo pump based on the flow detection signal corresponding to the corresponding pipeline, and automatically adjusts the water flow of the corresponding pipeline according to the difference between the actual water flow of each pipeline and the expected water flow of the corresponding pipeline, takes away the heat of the water channel plate corresponding to the corresponding pipeline, realizes precise control of the water flow of each test station, and solves the problem that the water flow of each test station cannot be accurately adjusted and controlled, resulting in an over-temperature alarm of the power semiconductor module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a water flow regulation system according to some embodiments of the present application;

[0022] Figure 2 is a schematic structural diagram of a water flow regulation system in some other embodiments of the present application;

[0023] Figure 3 is a schematic structural diagram of a water flow regulation system according to some other embodiments of the present application;

[0024] Figure 4 This is a structural diagram of the water outlet pipe and the water return pipe of some embodiments of the present application;

[0025] Figure 5 is a schematic structural diagram of a water temperature controller according to some embodiments of the present application;

[0026] Figure 6 Schematic diagram of the structure of an AC reactive power test system in some embodiments of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. "First" and "second" are only for the distinction of component names and do not indicate order.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following is a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. The embodiments of the present invention are described in detail with reference to schematic diagrams, which are merely examples and should not limit the scope of protection of the present invention.

[0031] The water flow regulating system provided by the embodiment of the present utility model is further described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1 As shown in FIG, it is a schematic diagram of the structure of the water flow regulating system of some embodiments of the present application. Figure 1As shown, the water flow regulation system includes a controller 10, a water tank 20, and multiple waterway plates 30 (three are shown) for dissipating heat from power devices. Each waterway plate 30 is connected to the water tank 20 via a corresponding pipe 40. Each pipe 40 is provided with a flow meter 41 and a servo pump 42, which are electrically connected to the controller 10. The flow meter 41 is used to detect the water flow in the corresponding pipe 40 and output flow detection signals Sf1-Sfn. Based on the corresponding flow detection signals Sf1-Sfn of each pipe 40, the controller 10 sends corresponding speed control signals Sr1-Srn to the servo pump 42 in the corresponding pipe 40 to adjust the speed of the corresponding servo pump 42, so that each servo pump 42 drives the heated water from the water tank 20 through the corresponding pipe 40 to the corresponding waterway plate 30.

[0033] Specifically, the controller 10 can be a device with data processing function such as a CPU, an MCU, a field programmable gate array (FPGA), a complex programmable logic device (CPLD), a programmable logic controller (PLC), etc. In a specific embodiment, the controller 10 is a PLC.

[0034] Specifically, the waterway plate 30 can be made of metal and is provided with a first water inlet, a first water outlet, and an internal pipe for hot water to flow. The first water inlet and the first water outlet are connected to the pipe 40.

[0035] Furthermore, the pipe 40 is detachably connected to the first water inlet and first water outlet of the waterway plate 30 via fasteners such as quick-release fittings, facilitating rapid docking of the waterway plate 30 and pipe 40. The waterway plate 30 is in contact with the power module through thermally conductive material, allowing the heat from the power module to be removed through the circulation of heated water within the pipe. The water tank 20 stores the heated water, heating or cooling it as needed before transporting it back to the waterway plate, forming a circulating water cooling system.

[0036] In this embodiment, multiple waterway plates 30 can be dispersed, each connected to the water tank 20 via a corresponding pipeline 40. Each pipeline 40 is equipped with a flowmeter 41 and a servo pump 42, both electrically connected to the controller 10. The servo pump 42 is used to drive the transfer of heated water through the pipeline, from the water tank 20 to the waterway plate 30. The faster the servo pump 42 rotates, the greater the water flow rate in the pipeline 40 per unit time. The flowmeter 41 detects the water flow in the pipeline 40 and outputs corresponding flow detection signals Sf1-Sfn. The controller 10 adjusts the speed of the corresponding servo pump 42 based on the flow detection signals Sf1-Sfn, thereby precisely regulating the water flow rate in the corresponding pipeline 40.

[0037] Specifically, the sensing component of the flow meter 41 can be welded in the pipeline 40, and the control panel can be placed outside the pipeline 40 for easy configuration.

[0038] Specifically, the controller 10 can regulate the water flow rate through closed-loop feedback, including but not limited to closed-loop control using a PID algorithm. During each control cycle, the PID algorithm calculates the difference between the set water flow rate and the actual value measured by the flow meter 41 to determine the control variable. The speed of the servo pump 42 is then adjusted based on the control variable. The flow meter 41 then measures the new water flow rate and feeds it back to the controller 10, beginning the next cycle. This process repeats continuously, forming a closed-loop control system.

[0039] In the water flow regulation system of this embodiment, each pipeline uses a separate servo pump to control the water flow. The water flow of the pipeline is detected by the flow meter of each pipeline, and a corresponding flow detection signal is output. Based on the flow detection signal, the controller sends a corresponding speed control signal to the servo pump of each pipeline. The water flow of each pipeline is adjusted by adjusting the speed of the servo pump, thereby achieving fast response and higher-precision water flow control, preventing excessive or insufficient water flow in the pipeline from adversely affecting the heat dissipation of the power module, and improving the stability and reliability of the system operation.

[0040] Furthermore, the starting speed of the servo pump 42 can be determined based on historical data. In a specific embodiment, the water flow regulation system is used in a power module test scenario, which requires multiple tests on multiple power modules. The speed data of the servo pump 42 when the water flow in the pipeline is stable during each test can be stored, and the average value of the speed data can be calculated after accumulating multiple times. This average value is used as the starting speed when the servo pump 42 is started next time. On the one hand, the conditions required for the test condition can be achieved more quickly, reducing the test time and improving the test efficiency; on the other hand, when the water level in the water tank drops to near the alarm line and no alarm is triggered, the water flow can still be stabilized to ensure normal test conditions and improve the stability of the test operation.

[0041] In some embodiments, Figure 2 is a schematic structural diagram of a water flow regulating system in some other embodiments of the present application, such as Figure 2 As shown, each pipeline 40 is provided with a return valve 43 and a pressure sensor 44 electrically connected to the controller 10. Each pressure sensor 44 detects the water pressure of the corresponding pipeline 40 and outputs a corresponding water pressure detection signal Sp1~Spn; based on the water pressure detection signal Sp1~Spn corresponding to each pipeline 40, the controller 10 sends a corresponding opening adjustment signal So1~Son to the return valve 43 of the corresponding pipeline 40 to adjust the conduction area of ​​the corresponding return valve 43, so that the corresponding return valve 43 controls the water flow of the heated water from the corresponding waterway plate 30 through the corresponding pipeline 40 to the water tank 20.

[0042] Similar to the above embodiment, the controller 10 can also regulate the water pressure in each pipeline through a closed-loop feedback method, including but not limited to closed-loop control through a PID method. During each control cycle, the PID algorithm first calculates a control variable based on the difference between the set water flow rate and the actual value measured by the flowmeter 41. The speed of the servo pump 42 is adjusted based on the control variable. The control variable is then calculated based on the difference between the set water pressure and the actual value measured by the pressure sensor 44. The conductance area of ​​the return valve 43 is adjusted based on the control variable, thereby achieving closed-loop control of the water flow and water pressure in the pipeline during each control cycle.

[0043] The water flow regulation system of this embodiment performs closed-loop control of the water flow and water pressure of each pipeline through a controller, further improving the timeliness and accuracy of water flow control in each pipeline, further reducing test interruptions or alarms caused by poor heat dissipation of the power module, improving test operation stability, and expanding the use scenarios of the water flow regulation system.

[0044] In some embodiments, Figure 3 is a schematic structural diagram of a water flow regulating system in some other embodiments of the present application, such as Figure 3 As shown, each pipeline 40 is also provided with a temperature sensor 45 electrically connected to the controller 10, and each temperature sensor 45 is used to detect the water temperature of the corresponding pipeline 40 and output a corresponding temperature detection signal St1~Stn; the controller 10 sends a corresponding speed control signal Sr1~Srn to the servo pump 42 of the corresponding pipeline 40 based on the flow detection signal Sf1~Sfn and temperature detection signal St1~Stn corresponding to each pipeline 40; and / or sends a corresponding opening adjustment signal So1~Son to the return valve 43 of the corresponding pipeline 40 based on the water pressure detection signal Sp1~Spn and temperature detection signal St1~Stn corresponding to each pipeline 40.

[0045] In each control cycle, the controller 10 adjusts the rotation speed of the servo pump 42 of the corresponding pipeline through a preset PID closed-loop control method based on the temperature detection signals St1~Stn obtained by the temperature sensors 45 corresponding to each pipeline, combined with the flow detection signals Sf1~Sfn obtained by the corresponding flow meter 41, thereby adjusting the water flow in the corresponding pipeline; in the same control cycle, the controller 10 also adjusts the conduction area of ​​the return valve 43 of the corresponding pipeline through a preset PID closed-loop control method based on the temperature detection signals St1~Stn obtained by the temperature sensors 45 corresponding to each pipeline, combined with the water pressure detection signals Sp1~Spn obtained by the corresponding pressure sensor 44.

[0046] When the water temperature measured by the temperature sensor 45 is high, it means that the heat generated by the power module is high and the demand for water flow is large. At this time, the servo pump speed can be increased and the conduction area of ​​the return valve 43 can be increased to take away the heat of the water channel plate 30 in time. When the water temperature measured by the temperature sensor 45 is low, it means that the heat generated by the power module is low and the demand for water flow is small. At this time, the opening of the return valve 43 can be closed first, and then the speed of the servo pump 42 can be reduced to fully utilize the heated water in the pipeline and reduce energy consumption.

[0047] Furthermore, the controller 10 can also heat or cool the heated water in the water tank 20 in advance according to the water temperature values ​​of the corresponding pipelines measured by each temperature sensor 45 and the water temperature value of the water tank 20 to maintain the stability of the water temperature in the water tank and avoid temperature fluctuations.

[0048] In some embodiments, Figure 4 is a schematic diagram of the structure of the pipeline in some embodiments of the present application, such as Figure 4 As shown, the pipeline 40 includes an outlet pipe 410 and a return pipe 420. The outlet pipe 410 transfers heated water from the water tank 20 to the waterway plate 30, while the return pipe 420 transfers heated water from the waterway plate 30 to the water tank 20. A servo pump 42, a flow meter 41, and a pressure sensor 44 are sequentially arranged on the outlet pipe 410 along the direction of water flow. A temperature sensor 45 and a return valve 43 are sequentially arranged on the return pipe 420 along the direction of water flow.

[0049] Specifically, one end of the water outlet pipe 410 is the second water inlet 1, which is located below one side of the water tank and connected to the water tank. Hot water enters the servo pump 42 through the second water inlet 1. The servo pump 42 is fixed to the base and connected to the second water inlet 1. The flow meter 41 is located after the servo pump 42, and its sensing component is welded to the water outlet pipe 410. The control panel is placed on the outside of the water outlet pipe 410 for easy operation. The pressure sensor 44 is installed on the bypass after the flow meter 41 to detect the water pressure value of the water outlet pipe 410 in real time and feedback it to the controller. The first water inlet and the first water outlet of the waterway plate are both detachably connected to the corresponding second water outlet 7 of the water outlet pipe 410 and the third water inlet 8 of the return pipe 420 via quick-release connectors, facilitating the rapid connection of the waterway plate with the water inlet and outlet pipes.

[0050] The temperature sensor 45 is installed on the return water pipe 420 to detect the return water temperature and send it to the controller. The controller can control the heating or cooling of the heated water in the water tank in advance based on the return water temperature and the water tank temperature; the return water valve 43 is installed on the return water pipe 420 to control the return water flow and adjust the water flow according to different working conditions; the return water port 11 is located above the same side of the second water inlet 1 and is connected to the water tank. The test water flows back to the water tank through the return water port 11.

[0051] Furthermore, if Figure 4As shown, the outlet pipe 410 is further provided with an outlet valve 46, which is disposed between the servo pump 42 and the flow meter 41. The outlet valve 46 is used to control the water flow rate of the outlet pipe 410, thereby adjusting the flow rate of the heated water entering the waterway plate 30. The outlet valve 46 can be used in conjunction with the return valve 43 to adjust the flow rate of the outlet pipe 410 and the return pipe 420, thereby improving the accuracy and timeliness of water flow regulation.

[0052] Furthermore, if Figure 4 As shown, the water outlet pipe 410 is also provided with an air blow port 47, which is arranged after the flow meter 41 and is used to test the air tightness of the water outlet pipe 410 before water is passed, and can blow the heated water in the water outlet pipe 410 back to the water tank 20 through the air blow port 47 after the test is completed.

[0053] Specifically, the air blowing port 47 may be installed on the bypass after the flow meter 41 and controlled to be on and off by a solenoid valve.

[0054] Some embodiments of the present application also provide a water temperature controller, Figure 5 This is a schematic diagram of the structure of the water temperature machine in some embodiments of the present application, such as Figure 5 As shown, the water temperature controller includes a heating pipe 50 and a cooler 60 for heating and cooling the heated water, as well as the water flow control system of the above embodiment (the servo pump, flow meter, and other components installed on the various pipes are not shown in the figure). The heating pipe and cooler are both installed on the water tank to adjust the temperature of the heated water in the water tank. It is understood that the method of installing the heating pipe and cooler on the water tank is a conventional technical content and will not be repeated here.

[0055] In each control cycle, the controller 10 can adjust the rotation speed of the servo pump corresponding to each pipeline based on the water flow detection value measured by the flow meter in each pipeline, thereby achieving fast response and high-precision water flow control.

[0056] In a further embodiment, the controller 10 can also adjust the speed of the servo pump and the opening of the return valve based on the water flow detection value measured by the flow meter in each pipeline and the water pressure detection value measured by the pressure sensor, so as to achieve fast response and higher precision water flow control, prevent the water flow in the pipeline from being too large or too small and causing adverse effects on the heat dissipation of the power module, and improve the stability and reliability of the operation of the water flow regulation system.

[0057] Furthermore, the controller 10 can obtain the actual temperature value of the hot water returned to the water tank based on the temperature detection signal of the temperature sensor of each pipeline, and adjust the speed of each servo pump and the opening of the corresponding return valve based on the actual temperature value, water flow detection value and water pressure detection value of the hot water in each pipeline to cope with various test conditions with different heat of different power modules; and according to the difference between the expected temperature value and the actual temperature value of the hot water, the hot water in the water tank is heated or cooled through the heating pipe 50 and the cooler 60, and the water temperature in the water tank is adjusted to the expected temperature value, and then the temperature-adjusted hot water is transported to each waterway plate 30 through the pipeline 40 to realize circulating water cooling and heat dissipation of the power module.

[0058] In some embodiments, the water temperature controller also includes a water purification system, located within the water tank, for purifying the heated water returning to the tank. This water purification system circulates and purifies the water in the tank, ensuring the reliability and service life of the water temperature controller. It should be noted that water purification systems are conventional in the art and will not be described in detail here.

[0059] Some embodiments of the present application also provide an AC reactive power testing system, Figure 6 This is a schematic diagram of the structure of the AC reactive power test system in some embodiments of the present application. Figure 6 As shown, the AC reactive power test system includes the water temperature machine 100 in the above embodiment, and a plurality of power modules 70 to be tested that dissipate heat through the water temperature machine 100 .

[0060] Specifically, the power module 70 under test includes but is not limited to an IGBT module. The power module 70 under test can be in contact with the waterway plate 30 via a heat conductive material to achieve heat conduction.

[0061] The AC reactive power test system of this embodiment is used to perform an AC reactive power test on the power module 70 under test, so as to test and evaluate the performance and reliability of the power module 70 under test, thereby reducing the failure risk of the power module 70 under test.

[0062] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A water flow regulation system, characterized in that: The system includes a controller, a water tank, and multiple waterway plates for dissipating heat from power devices. Each of the waterway plates is connected to the water tank via a corresponding pipeline. Each of the pipelines is provided with a flow meter and a servo pump electrically connected to the controller. Each flow meter is used to detect the water flow in the corresponding pipeline and output a flow detection signal. Among them, the controller sends a corresponding speed control signal to the servo pump of each pipeline based on the flow detection signal corresponding to each pipeline to adjust the speed of each servo pump. Each servo pump is used to drive the heated water from the water tank through the corresponding pipeline to the corresponding waterway plate.

2. The system according to claim 1, wherein: The pipeline is also provided with a return valve and a pressure sensor electrically connected to the controller. The pressure sensor is used to detect the water pressure of the pipeline and output a water pressure detection signal; The controller sends a corresponding opening adjustment signal to the return valve corresponding to the pipeline based on the water pressure detection signal corresponding to each pipeline to adjust the conduction area of ​​the corresponding return valve. Each return valve is used to control the water flow of the heated water returning to the water tank from the corresponding waterway plate through the corresponding pipeline.

3. The system according to claim 2, characterized in that The pipeline is also provided with a temperature sensor electrically connected to the controller. The temperature sensor is used to detect the water temperature of the pipeline and output a temperature detection signal; The controller sends a corresponding speed control signal to the servo pump corresponding to the pipeline based on the flow detection signal and temperature detection signal corresponding to each pipeline; and / or sends a corresponding opening adjustment signal to the return valve corresponding to the pipeline based on the water pressure detection signal and temperature detection signal corresponding to each pipeline.

4. The system according to claim 3, characterized in that The pipeline includes a water outlet pipe and a water return pipe, the water outlet pipe transmits the heated water from the water tank to the water channel plate, and the water return pipe transmits the heated water from the water channel plate to the water tank; The servo pump, the flow meter and the pressure sensor are sequentially arranged on the water outlet pipe along the water flow direction, and the temperature sensor and the return valve are sequentially arranged on the return pipe along the water flow direction.

5. The system according to claim 4, characterized in that The water outlet pipe is further provided with a water outlet valve, which is arranged between the servo pump and the flow meter and is used to control the water flow of the water outlet pipe.

6. The system according to claim 4, characterized in that The water outlet pipe is also provided with an air blowing port, which is arranged after the flow meter and is used to test the air tightness of the water outlet pipe before water is passed.

7. The system according to claim 1, wherein: The pipeline is detachably connected to the waterway plate.

8. A water temperature machine, characterized in that: The water temperature machine includes a heating pipe and a cooler for heating and cooling the hot water, and a water flow regulation system as described in any one of claims 1 to 7. The heating pipe and the cooler are both installed in the water tank to adjust the temperature of the hot water in the water tank.

9. The water temperature controller according to claim 8, characterized in that: The water temperature machine further includes a water purification system, which is disposed in the water tank and is used to purify the heated water that flows back into the water tank.

10. An AC reactive power test system, characterized in that: The AC reactive power test system includes the water temperature machine according to claim 8 and a plurality of power modules to be tested that dissipate heat through the water temperature machine.

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