Multi-branch high-power pump-driven two-phase heat dissipation system and control method thereof

Abstract

This invention discloses a multi-branch high-power pump-driven two-phase heat dissipation system and its control method, belonging to the field of electronic device heat dissipation technology. The core of the method lies in using the temperature of the heat dissipation plate as the highest priority control input. When the temperature of any branch's heat dissipation plate exceeds a preset target, an inter-branch flow redistribution operation is immediately executed. This involves increasing the opening of the regulating valve in that branch while simultaneously decreasing the openings of regulating valves in other branches, thereby preferentially distributing the cooling medium to the most demanding heat dissipation components. If a temperature difference still exists after this operation, the valve opening in that branch is further increased until it reaches its maximum, and finally, a cascaded adjustment is performed to increase the total system flow. This invention, through its cascaded control logic of "first dynamic redistribution between branches, then system-level total flow adjustment," can directly and quickly prevent thermal runaway of electronic components, while simultaneously achieving intelligent dynamic flow distribution and optimizing system operating costs.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for electronic devices, specifically to a multi-branch high-power pump-driven two-phase heat dissipation system and its control method. Background Technology

[0002] With the continuous increase in power density of electronic devices, liquid cooling technology has become a key solution. Among them, pump-driven two-phase cooling systems utilize the boiling phase change of the working fluid within the cold plate to absorb a large amount of latent heat, resulting in extremely high heat dissipation efficiency. For devices containing multiple heat-generating units, a two-phase cooling system with multiple branches connected in parallel is typically used.

[0003] Most existing liquid cooling control methods are designed for single-phase systems, focusing on maintaining stable flow and pressure. However, applying these methods directly to two-phase systems presents significant challenges. Two-phase systems involve a phase change process in the working fluid; improper control can easily lead to heat transfer deterioration within the cold plate, causing thermal runaway or even burnout of electronic components. Existing single-phase control methods cannot intelligently adjust the working fluid flow distribution between branches based on differences in heat load, making it difficult to ensure the temperature safety of each electronic component under complex operating conditions.

[0004] Furthermore, while some existing two-phase system control schemes attempt to adjust branch circuits, their control objectives are often limited to maintaining stable system pressure or uniform parameters at the inlet of each branch, rather than prioritizing "preventing thermal runaway of electronic components." For example, Chinese patent document CN118591156A discloses a scheme that stabilizes system pressure by monitoring the pressure and temperature at nodes such as the outlet of the circulating pump and the inlet of the main circuit pressure relief valve, and adjusting pump power and bypass valves accordingly. Simultaneously, it adjusts branch valves to ensure consistent inlet conditions by comparing parameters from sensors at each branch inlet. This method aims to achieve uniformity and stability of the system flow field, ensuring each cold plate operates under ideal conditions. This control logic is insufficiently responsive to sudden high heat loads and may operate at high power consumption for extended periods to maintain system uniformity, increasing system operating costs.

[0005] Therefore, there is an urgent need for a control method specifically designed for multi-branch pump-driven two-phase heat dissipation systems that can directly and effectively prevent thermal runaway of electronic components, intelligently allocate branch flow, optimize system energy efficiency, and reduce operating costs. Summary of the Invention

[0006] To address the shortcomings in the aforementioned background technology, this invention proposes a multi-branch high-power pump-driven two-phase heat dissipation system and its control method to solve the problem of thermal runaway of electronic components in the two-phase heat dissipation system, realize intelligent dynamic allocation of branch flow, and reduce system operating costs.

[0007] The technical solution of this invention is implemented as follows:

[0008] A multi-branch high-power pump-driven two-phase cooling system includes a two-phase liquid cooling source system, a liquid supply distributor, and a liquid return distributor connected in series. The liquid supply distributor and the liquid return distributor are connected by at least two parallel cooling branches. The outlet of the two-phase liquid cooling source system is connected to the inlet of each cooling branch through the liquid supply distributor, and the outlet of each cooling branch is connected to the inlet of the two-phase liquid cooling source system through the liquid return distributor. Each cooling branch includes a branch pipe connecting the liquid supply distributor and the liquid return distributor, and a [missing information - likely a device or component] is connected to the branch pipe. The system includes branch regulating valves and two-phase heat dissipation plates for cooling electronic components. Temperature sensors for monitoring temperature are installed on the branch pipes and the two-phase heat dissipation plates. It also includes a control system, which is communicatively connected to each of the temperature sensors and each of the branch regulating valves. The control system is configured to: based on temperature changes fed back from the temperature sensors in any heat dissipation branch, adjust the opening of the branch regulating valve in that branch, and correspondingly adjust the opening of the branch regulating valves in the remaining heat dissipation branches, to perform flow distribution priority control on that heat dissipation branch.

[0009] Preferably, each heat dissipation branch includes several parallel two-phase heat dissipation plates, and the two ends of the several two-phase heat dissipation plates are respectively connected to the branch pipeline through a branch liquid supply distributor and a branch liquid return distributor.

[0010] Preferably, each of the heat dissipation branches further includes a flow meter and a first pressure sensor disposed between the branch regulating valve and the branch liquid supply distributor, and a second pressure sensor disposed at the outlet of the branch liquid return distributor; the temperature sensor includes a first temperature sensor disposed between the flow meter and the first pressure sensor, and a second temperature sensor disposed between the second pressure sensor and the liquid return distributor, and also includes a third temperature sensor disposed on the two-phase heat dissipation plate.

[0011] A control method for the above-mentioned multi-branch high-power pump-driven two-phase heat dissipation system, the method comprising: monitoring that the temperature of the two-phase heat dissipation plate in the Nth heat dissipation branch meets the first adjustment condition, and performing a flow redistribution operation between branches: increasing the opening of the branch regulating valve of the Nth branch and decreasing the opening of the branch regulating valve of at least one other heat dissipation branch.

[0012] Preferably, the specific process of monitoring that the temperature of the two-phase heat dissipation plate in the Nth heat dissipation branch meets the first adjustment condition includes: obtaining the temperature difference ΔT between the real-time temperature TN of the two-phase heat dissipation plate in the Nth heat dissipation branch and the preset target temperature T0, where ΔT = TN - T0; the first adjustment condition is ΔT > 0.

[0013] Preferably, after performing the inter-branch flow redistribution operation, the method further includes: if ΔT is still greater than 0, then continue to increase the opening of the branch regulating valve of the Nth heat dissipation branch; if the opening of the branch regulating valve of the Nth heat dissipation branch reaches its maximum opening and ΔT is still greater than 0, then perform a system-level flow regulation operation: increase the liquid supply flow of the two-phase liquid cooling source system.

[0014] Preferably, in the specific process of reducing the opening of the branch regulating valve of at least one other heat dissipation branch: the reduction range of the opening of the regulating valve of each branch is determined differently according to the temperature difference between the real-time temperature of the two-phase heat dissipation cold plate in each other heat dissipation branch and the target temperature T0; wherein, for the heat dissipation branch with a smaller temperature difference, the reduction range of the opening of its branch regulating valve is greater.

[0015] Preferably, after ensuring that ΔT meets the requirements, an energy-saving optimization step is also included: after a preset stable operating time, an attempt is made to reduce the liquid supply flow rate of the two-phase liquid cooling source system; during the process of reducing the liquid supply flow rate, if ΔT is detected to be greater than 0 again, the liquid supply flow rate of the two-phase liquid cooling source system is adjusted back.

[0016] Preferably, when performing the inter-branch flow redistribution operation, the real-time flow of each heat dissipation branch is monitored simultaneously; wherein, when reducing the opening of the branch regulating valve of other heat dissipation branches, their flow is controlled to be no lower than the preset minimum safe flow threshold.

[0017] Preferably, the method further includes: using a first temperature sensor to monitor the temperature at the inlet end of each heat dissipation branch, and reducing the liquid supply temperature or heat dissipation capacity of the two-phase liquid cooling source system when the medium temperature at the inlet end is lower than a preset subcooling degree; using a second temperature sensor to monitor the temperature at the outlet end of each heat dissipation branch, and increasing the flow rate of the heat dissipation branch when the medium temperature at the outlet end is higher than a preset temperature.

[0018] The beneficial effects of this invention are:

[0019] By using the direct temperature of the two-phase heat dissipation plate as the core control signal and establishing a direct control link of "temperature difference drive - valve linkage", the system can react to local overheating as quickly as possible and allocate cooling resources to the branches that need them most, thus fundamentally solving the problem that existing technologies cannot cope with the risk of local thermal runaway.

[0020] A cascaded control strategy of "dynamic redistribution between branches first, followed by system-level total flow regulation" is creatively adopted. Prioritizing flow adjustment between branches allows for rapid response to localized overheating with zero additional pump power cost; the total system flow is only increased when the adjustment reaches its limit. Simultaneously, a differentiated strategy is introduced to reduce flow in other branches, ensuring overall stability. This strategy maximizes energy efficiency while ensuring safety. Under most heat load fluctuations, only valve adjustments are needed, avoiding frequent pump start-ups and shutdowns or prolonged high-speed operation. Furthermore, the system automatically optimizes its operation after reaching steady state, reducing flow to the minimum necessary level, and combined with inlet subcooling optimization, reduces overall system energy consumption and operating costs from multiple dimensions. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of a multi-branch pump-driven two-phase heat dissipation system provided in an embodiment of the present invention.

[0023] Figure 2 for Figure 1 A schematic diagram of a structure in which multiple two-phase heat dissipation plates are installed inside a single heat dissipation branch.

[0024] Figure 3 for Figure 1 A schematic diagram of the sensor arrangement structure inside a single heat dissipation branch.

[0025] The diagram is labeled as follows: 1-Two-phase liquid cooling source system, 2-Liquid supply distributor, 3-Heat dissipation branch, 4-Liquid return distributor, 5-Branch liquid supply distributor, 6-Two-phase heat dissipation plate, 7-Branch liquid return distributor, 8-Branch regulating valve, 9-Flow meter, 10-First temperature sensor, 11-First pressure sensor, 12-Second pressure sensor, 13-Second temperature sensor. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1 , 2As shown in Embodiment 1, a multi-branch high-power pump-driven two-phase heat dissipation system includes a two-phase liquid cooling source system 1, a liquid supply distributor 2, and a liquid return distributor 4 connected in series. The liquid supply distributor 2 and the liquid return distributor 4 are connected by at least two parallel heat dissipation branches 3, forming the core heat dissipation circuit of the system.

[0028] Specifically, in this embodiment, the outlet of the two-phase liquid cooling source system 1 is connected to the inlet of each heat dissipation branch 3 via the liquid supply distributor 2, and the outlet of each heat dissipation branch 3 is connected to the inlet of the two-phase liquid cooling source system 1 via the liquid return distributor 4, forming a complete closed loop. The two-phase liquid cooling source system 1 integrates a circulating pump, a liquid storage tank, and a condenser (optionally a conventional air-cooled radiator) connected by pipes. Its function is to provide a single-phase liquid cooling medium with a certain degree of subcooling and to receive and condense the gas-liquid two-phase mixture returned from each heat dissipation branch 3, thereby achieving cyclic cooling.

[0029] In addition, such as Figure 3 As shown, each heat dissipation branch 3 includes a branch pipe connected between the liquid supply distributor 2 and the liquid return distributor 4. A branch regulating valve 8 and a two-phase heat dissipation plate 6 for cooling electronic components are connected to this branch pipe. In this embodiment, the branch regulating valve 8 is preferably an electrically operated regulating valve, which can achieve continuous and precise control of the opening degree. The two-phase heat dissipation plate 6 has microchannels inside, which are closely fitted to the heat-generating electronic components, where the working fluid flows and absorbs heat, undergoing a phase change.

[0030] To achieve precise control, temperature sensors for monitoring temperature are installed on both the branch pipes and the two-phase heat dissipation plates 6. Alternatively, each heat dissipation branch 3 may also include one or more parallel-connected two-phase heat dissipation plates 6 to simultaneously dissipate heat from one or more electronic components. When several two-phase heat dissipation plates 6 are arranged in parallel, both ends of each plate are connected to the branch pipe via a branch liquid supply distributor 5 and a branch liquid return distributor 7, thus utilizing one heat dissipation branch to serve a group of electronic components.

[0031] As a further specific implementation, each heat dissipation branch 3 also includes a flow meter 9 and a first pressure sensor 11 disposed between the branch regulating valve 8 and the branch liquid supply distributor 5, and a second pressure sensor 12 disposed at the outlet of the branch liquid return distributor 7. The temperature sensors include a first temperature sensor 10 disposed between the flow meter 9 and the first pressure sensor 11, a second temperature sensor 13 disposed between the second pressure sensor 12 and the liquid return distributor 4, and a third temperature sensor directly disposed on the two-phase heat dissipation plate 6. The third temperature sensor may be a thermocouple for monitoring; it serves as the most critical signal source for preventing thermal runaway in this system and is used to directly measure the temperature of the two-phase heat dissipation plate 6.

[0032] As a further specific implementation, the system also includes a control system (optionally a conventional PLC controller). The control system is communicatively connected to each of the first temperature sensors 10, the second temperature sensor 13, and the third temperature sensor on the two-phase heat dissipation plate 6, as well as each of the branch regulating valves 8. It also communicates with the flow meter 9, the first pressure sensor 11, the second pressure sensor 12, and the two-phase liquid cooling source system 1. The control system is configured to execute the following control logic: based on the temperature change feedback from the temperature sensor in any heat dissipation branch 3, it adjusts the opening of the branch regulating valve 8 of that branch, and correspondingly adjusts the opening of the branch regulating valves 8 of the remaining heat dissipation branches 3, thereby achieving priority control of flow distribution to branches with high heat loads.

[0033] Example 2: A control method applied to the above-mentioned multi-branch high-power pump-driven two-phase heat dissipation system includes the following steps:

[0034] First, the control system continuously monitors the readings of the third temperature sensor on the two-phase heat dissipation plate 6 in each heat dissipation branch 3. When the temperature of the two-phase heat dissipation plate 6 in the Nth heat dissipation branch 3 meets the first adjustment condition, the system responds immediately. Specifically, the response process includes:

[0035] The temperature difference ΔT between the real-time temperature TN of the two-phase heat dissipation plate 6 in the Nth heat dissipation branch 3 and the preset target temperature T0 is obtained by the third temperature sensor, where ΔT = TN - T0.

[0036] The first adjustment condition is △T > 0.

[0037] The target temperature T0 is a threshold set according to the safe operating temperature of electronic components. ΔT > 0 means that the component is at risk of overheating.

[0038] If the first adjustment condition is met, the control system will perform the inter-branch flow redistribution operation:

[0039] The opening of the regulating valve 8 of the Nth heat dissipation branch 3 is increased, while the opening of the regulating valve 8 of at least one other heat dissipation branch 3 is decreased. This allows for the dynamic distribution of more cooling fluid to the Nth branch with the highest temperature through flow adjustment between branches, without immediately changing the total pump power of the two-phase liquid cooling source system 1. This enables rapid and targeted cooling of the hottest spot, thus achieving initial prevention of thermal runaway at low cost.

[0040] As a further specific implementation, after performing the inter-branch flow redistribution operation, the control system continues to determine: if ΔT is still greater than 0, the opening of the branch regulating valve 8 of the Nth heat dissipation branch 3 is further increased, and ΔT is gradually adjusted to approach zero. If the opening of the branch regulating valve 8 of the Nth heat dissipation branch 3 has reached its maximum opening (e.g., 100%), and ΔT is still greater than 0, it indicates that relying solely on inter-branch flow adjustment has reached its limit. At this time, to prevent thermal runaway, the control system will perform a system-level total flow regulation operation: increasing the liquid supply flow of the two-phase liquid cooling source system 1 (e.g., increasing the speed of the circulating pump or increasing the external heat dissipation efficiency). The increase in the total system flow provides a stronger cooling capacity foundation for all branches, thereby ultimately suppressing the temperature difference ΔT of the Nth heat dissipation branch 3 to a range that meets the requirements (ΔT ≤ 0), thus constituting the final guarantee against thermal runaway. This embodiment employs a cascaded control strategy, which allows for adjustments to valves to handle most heat load fluctuations, avoiding frequent pump start-ups and shutdowns or prolonged high-speed operation. Furthermore, the system automatically optimizes its operation after reaching steady state, reducing flow to the minimum necessary level. Combined with inlet subcooling optimization, this approach reduces overall energy consumption and operating costs from multiple perspectives.

[0041] This embodiment uses the direct temperature of the two-phase heat dissipation plate as the core control signal. By establishing a direct control link of "temperature difference drive - valve linkage", the system can react to local overheating as quickly as possible and allocate cooling resources to the branches that need them most, thus fundamentally solving the problem that existing technologies cannot cope with the risk of local thermal runaway.

[0042] Example 3, based on Example 2, specifically involves reducing the opening of the branch regulating valve 8 of at least one other heat dissipation branch 3 as follows:

[0043] The control system determines the reduction in the opening of the regulating valve 8 for each branch differently based on the temperature difference between the real-time temperature of the two-phase cooling plate 6 in each of the other cooling branches 3 and the target temperature T0. Specifically, for cooling branches 3 with smaller temperature differences, their own temperatures are lower, their heat dissipation margin is larger, and the reduction in the opening of their regulating valve 8 is greater; conversely, for branches with larger temperature differences, the reduction is smaller or no adjustment is made at all. This strategy is not a simple averaging; it prioritizes the hottest branch while maximizing the overall temperature balance of the system, avoiding overheating of other branches while addressing one hot spot, demonstrating the intelligence of the system's flow distribution.

[0044] As a further specific implementation, during the inter-branch flow redistribution operation, the control system also simultaneously monitors the real-time flow of each heat dissipation branch 3 obtained through the flow meter 9. Specifically, when reducing the opening of the branch regulating valve 8 of other heat dissipation branches 3, the flow rate is controlled to not fall below a preset minimum safe flow rate threshold. This threshold is the minimum cooling flow rate required to ensure the basic operation of electronic components. This provides a fundamental safety guarantee for all branches, ensuring that intelligent allocation does not compromise the basic operational safety of the system.

[0045] As a further specific implementation, after adjusting the total flow rate at the system level to ensure that ΔT meets the requirements, the control system also performs energy-saving optimization steps to reduce operating costs: after a preset stable operating time, it attempts to gradually reduce the liquid supply flow rate of the two-phase liquid cooling source system 1. During the process of reducing the liquid supply flow rate, if ΔT is detected to be greater than 0 again, the liquid supply flow rate of the two-phase liquid cooling source system 1 is immediately adjusted back; if ΔT continues to meet the requirements, the flow rate is further reduced. This process enables the system to automatically find the minimum total system flow rate required under the current heat dissipation load, thereby minimizing the power consumption of the circulating pump and optimizing the system operating costs.

[0046] Example 4, based on Example 3, further includes the following steps:

[0047] The working fluid temperature at the inlet of each heat dissipation branch 3 is monitored using the first temperature sensor 10. This inlet temperature reflects the subcooling of the working fluid before it enters the cold plate. If the inlet medium temperature is found to be lower than the preset subcooling value, it indicates that the subcooling of the working fluid provided by the two-phase liquid cooling source system 1 is too large, which may result in unnecessary waste of cooling capacity. In this case, the control system can instruct the liquid supply temperature or heat dissipation capacity of the two-phase liquid cooling source system 1 to be reduced (for example, by adjusting the fan speed of the condenser), thereby reducing the energy consumption of the refrigeration system while ensuring the minimum subcooling required for boiling heat exchange, thus reducing the system operating cost from another perspective.

[0048] Simultaneously, the working fluid temperature at the outlet end of each heat dissipation branch 3 is monitored using the second temperature sensor 13. This outlet temperature reflects the state of the working fluid after absorbing heat within the cold plate. If the medium temperature at the outlet end is higher than the preset outlet temperature threshold, it may indicate that the heat exchange intensity of that branch is high, or the flow rate is still relatively insufficient. In this case, as an auxiliary or enhanced regulation, the control system can trigger or instruct an increase in the flow rate of that heat dissipation branch 3: more aggressively increase the valve opening of that branch, or meet the conditions for triggering system-level total flow regulation earlier, thereby adding a layer of protection against thermal risks caused by changes in heat exchange state and helping to prevent thermal runaway.

[0049] This embodiment achieves coordinated control using first and second temperature sensors, further optimizing system performance.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-branch high-power pump-driven two-phase cooling system, comprising a two-phase liquid cooling source system (1), a liquid supply distributor (2), and a liquid return distributor (4) connected in series, characterized in that: The liquid supply distributor (2) and the liquid return distributor (4) are connected by at least two parallel heat dissipation branches (3); The outlet of the two-phase liquid cooling source system (1) is connected to the inlet of each heat dissipation branch (3) through the liquid supply distributor (2), and the outlet of each heat dissipation branch (3) is connected to the inlet of the two-phase liquid cooling source system (1) through the liquid return distributor (4). Each heat dissipation branch (3) includes several branch pipes connected between the liquid supply distributor (2) and the liquid return distributor (4). A branch regulating valve (8) and a two-phase heat dissipation plate (6) for heat dissipation of electronic components are connected to the branch pipes. Temperature sensors for monitoring temperature are provided on the branch pipes and the two-phase heat dissipation plate (6). It also includes a control system, which is communicatively connected to each of the temperature sensors and each of the branch regulating valves (8); the control system is configured to: adjust the opening of the branch regulating valve (8) of any heat dissipation branch (3) based on the temperature change fed back by the temperature sensor in that branch, and adjust the opening of the branch regulating valves (8) of the other heat dissipation branches (3) accordingly, so as to perform flow distribution priority control on the heat dissipation branch (3).

2. The multi-branch high-power pump-driven two-phase cooling system according to claim 1, characterized in that, Each heat dissipation branch (3) includes several parallel two-phase heat dissipation plates (6), and the two ends of the several two-phase heat dissipation plates (6) are connected to the branch pipeline through the branch liquid supply distributor (5) and the branch liquid return distributor (7), respectively.

3. The multi-branch high-power pump-driven two-phase cooling system according to claim 2, characterized in that, Each of the heat dissipation branches (3) also includes a flow meter (9) and a first pressure sensor (11) disposed between the branch regulating valve (8) and the branch liquid supply distributor (5), and a second pressure sensor (12) disposed at the outlet of the branch return liquid distributor (7); the temperature sensor includes a first temperature sensor (10) disposed between the flow meter (9) and the first pressure sensor (11), and a second temperature sensor (13) disposed between the second pressure sensor (12) and the return liquid distributor (4), and also includes a third temperature sensor disposed on the two-phase heat dissipation plate (6).

4. A control method for a multi-branch high-power pump-driven two-phase cooling system, applied to the multi-branch high-power pump-driven two-phase cooling system as described in any one of claims 1-3, characterized in that, The method includes: In response to the detection that the temperature of the two-phase heat dissipation plate (6) in the Nth heat dissipation branch (3) meets the first regulation condition, the flow redistribution operation between branches is performed: the opening of the branch regulating valve (8) of the Nth branch is increased, and the opening of the branch regulating valve (8) of at least one other heat dissipation branch (3) is decreased.

5. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 4, characterized in that, The specific process in response to the monitoring that the temperature of the two-phase heat dissipation plate (6) in the Nth heat dissipation branch (3) meets the first regulation condition includes: Obtain the temperature difference ΔT between the real-time temperature TN of the two-phase heat dissipation plate (6) in the Nth heat dissipation branch (3) and the preset target temperature T0, where ΔT = TN - T0; The first adjustment condition is △T > 0.

6. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 5, characterized in that, After performing the inter-branch traffic redistribution operation, the following is also included: If △T is still greater than 0, then continue to increase the opening of the branch regulating valve (8) of the Nth heat dissipation branch (3); When the branch regulating valve (8) of the Nth heat dissipation branch (3) reaches its maximum opening and ΔT is still greater than 0, a system-level flow regulation operation is performed: the liquid supply flow of the two-phase liquid cooling source system (1) is increased.

7. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 6, characterized in that, In the specific process of reducing the opening of the branch regulating valve (8) of at least one other heat dissipation branch (3): Based on the temperature difference between the real-time temperature of the two-phase heat dissipation cold plate (6) in each of the other heat dissipation branches (3) and the target temperature T0, the reduction range of the opening of the regulating valve (8) of each branch is determined differently. Among them, for the heat dissipation branch (3) with a smaller temperature difference, the opening degree of its branch regulating valve (8) decreases more significantly.

8. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 6, characterized in that, After ensuring that ΔT meets the requirements, energy-saving optimization steps are also included: After a preset stable operating time, the liquid supply flow rate of the two-phase liquid cooling source system (1) is reduced. If ΔT is detected to be greater than 0 again during the process of reducing the liquid supply flow rate, the liquid supply flow rate of the two-phase liquid cooling source system (1) will be adjusted back.

9. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 4, characterized in that, When performing the inter-branch flow redistribution operation, the real-time flow of each heat dissipation branch (3) is monitored simultaneously; When reducing the opening of the branch regulating valve (8) of other heat dissipation branch (3), the flow rate is controlled to be no less than the preset minimum safe flow rate threshold.

10. The control method for a multi-branch high-power pump-driven two-phase heat dissipation system according to claim 4, characterized in that, It also includes using the first temperature sensor (10) to monitor the temperature of the working fluid at the inlet of each heat dissipation branch (3). When the inlet temperature is lower than the preset subcooling threshold, the two-phase liquid cooling source system (1) is controlled to reduce the subcooling of its supply working fluid in order to optimize the system energy efficiency. The temperature of the working fluid at the outlet of each heat dissipation branch (3) is monitored by the second temperature sensor (13). When the temperature of the medium at the outlet is higher than the preset temperature, the flow rate of the heat dissipation branch (3) is increased.

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