Liquid leakage detection circuit, mainboard and liquid cooling server
Through differential signal design and logic judgment module, the problem of liquid cooling server leakage detection being susceptible to noise interference is solved, fast and accurate leakage judgment is achieved, and detection accuracy and system stability are improved.
Patent Information
- Application Number
- CN202510995026.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-18
- Publication Date
- 2025-10-17
AI Technical Summary
The leakage detection scheme of existing liquid-cooled servers is easily affected by noise interference, resulting in false alarms, affecting the stable operation of the system and the efficiency of operation and maintenance.
Using a differential signal design, combined with pull-up and pull-down resistors, the differential voltage signal is compared with the preset threshold voltage signal to achieve fast and accurate leakage detection, and the logic judgment module is used to distinguish between real leakage signals and noise signals.
Significantly reduce the false alarm rate of liquid leakage, improve detection accuracy and anti-interference ability, ensure the stable operation of the system in complex environments, simplify system design and reduce costs.
Smart Images
Figure CN120800686A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of liquid-cooled server design, and particularly relates to a liquid leakage detection circuit, a mainboard and a liquid-cooled server. BACKGROUND
[0002] In the field of server technology, with the continuous improvement of the performance requirements of servers, liquid-cooled servers are more and more widely used due to their high heat dissipation capacity. In the design of liquid-cooled servers, liquid leakage detection is a key link to ensure the safe operation of the system, and its reliability directly affects the stable operation of the server.
[0003] In the related art, an impedance detection scheme based on a liquid leakage detection cable is usually used. Specifically, by detecting the impedance change of the liquid leakage detection cable, a level voltage division operation is performed, and then whether a liquid leakage state occurs is determined according to a pre-set voltage level interval. However, there is a problem of liquid leakage false alarm. SUMMARY
[0004] The liquid leakage detection circuit, the mainboard and the liquid-cooled server provided by the present application can improve the problem of liquid leakage false alarm in the related art.
[0005] In a first aspect, the present application provides a liquid leakage detection circuit, comprising: a differential signal generation module, a signal comparison module and a logic judgment module, wherein:
[0006] The differential signal generation module comprises a first liquid leakage detection cable and a second liquid leakage detection cable, the first liquid leakage detection cable is connected to a power supply voltage through a pull-up resistor, the second liquid leakage detection cable is grounded through a pull-down resistor, and the two detection cables constitute a differential pair of equal length and equal distance in a printed circuit board (PCB) layout, and are used to generate a differential detection signal pair;
[0007] The two input ends of the signal comparison module are connected with the first liquid leakage detection cable and the second liquid leakage detection cable respectively, and are used to output a differential voltage signal corresponding to the impedance change between the two detection cables in real time based on the differential detection signal pair;
[0008] The logic judgment module is connected with the output end of the signal comparison module, and is used to judge whether liquid leakage occurs based on the differential voltage signal and a pre-set threshold voltage signal.
[0009] In a dry state, the two detection cables present an open circuit characteristic, and the differential voltage signal maintains a first steady state value; in a wet state, a conductive path is formed between the two detection cables, and the differential voltage signal jumps to a second steady state value different from the first steady state value.
[0010] In a possible implementation, the signal comparison module comprises an operational amplifier, the non-inverting input and the inverting input of the operational amplifier are respectively used as the two inputs of the signal comparison module, and the output of the operational amplifier is used as the output of the signal comparison module.
[0011] In a possible implementation, the logic judgment module comprises a voltage comparator and a logic control unit, wherein: the two inputs of the voltage comparator are used as the two inputs of the logic judgment module, and are connected with the output of the signal comparison module and a preset threshold voltage signal respectively, for comparing the differential voltage signal with the preset threshold voltage signal and outputting a comparison result; the input of the logic control unit is connected with the output of the voltage comparator, for judging whether liquid leakage occurs according to the comparison result.
[0012] In a possible implementation, when judging whether liquid leakage occurs according to the comparison result, the logic control unit is specifically configured to: if the comparison result is high, it is determined that liquid leakage occurs; and if the comparison result is low, it is determined that liquid leakage does not occur.
[0013] In a possible implementation, the logic control unit is further configured to: when it is determined that liquid leakage occurs, perform a corresponding control operation, and the control operation comprises triggering an alarm device.
[0014] In a possible implementation, the logic judgment module further comprises a state latch unit, and the state latch unit is configured to lock an alarm state when it is determined that liquid leakage occurs.
[0015] In a possible implementation, the state latch unit is a data latch flip-flop (D flip-flop) or a reset-set flip-flop (RS flip-flop).
[0016] In a possible implementation, the preset threshold voltage signal is provided by a programmable reference voltage source, for adapting to liquid leakage detection sensitivity adjustment in different environments.
[0017] In a second aspect, the application provides a mainboard comprising the liquid leakage detection circuit according to any one of the first aspect.
[0018] In a third aspect, the application provides a liquid-cooled server comprising the liquid leakage detection circuit according to any one of the first aspect, or comprising the mainboard according to the second aspect.
[0019] The liquid leakage detection circuit, the mainboard and the liquid-cooled server provided by the application comprise a differential signal generation module, a signal comparison module and a logic judgment module, wherein the differential signal generation module comprises a first liquid leakage detection cable and a second liquid leakage detection cable, the first liquid leakage detection cable is connected to a power supply voltage through a pull-up resistor, the second liquid leakage detection cable is grounded through a pull-down resistor, and the two detection cables form a differential trace pair with equal length and equal distance in the PCB layout; two input ends of the signal comparison module are connected with the first liquid leakage detection cable and the second liquid leakage detection cable respectively, and are used for outputting a differential voltage signal corresponding to the impedance change between the two detection cables in real time; the logic judgment module is connected with the output end of the signal comparison module, and is used for judging whether liquid leakage occurs based on the differential voltage signal and a preset threshold voltage signal; wherein the two detection cables present an open circuit characteristic in a dry state, and the differential voltage signal maintains a first steady state value; in a wet state, a conductive path is formed between the two detection cables, and the differential voltage signal jumps to a second steady state value different from the first steady state value. By adopting the differential signal design and cooperating with the pull-up and pull-down resistor design, the application can effectively reduce noise interference, significantly improve the liquid leakage false alarm problem caused by the traditional single-end detection scheme being susceptible to noise interference; in addition, by using the signal comparison module to output the differential voltage signal corresponding to the impedance change between the two detection cables in real time, and further using the logic judgment module to compare the differential voltage signal with the preset threshold voltage signal, the rapid and accurate determination of whether liquid leakage occurs is realized, the anti-interference ability and detection precision of liquid leakage detection are greatly improved, and it is helpful to provide more efficient and accurate solutions for various scenarios involving liquid leakage detection. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.
[0021] Figure 1 Structure diagram of the liquid leakage detection circuit provided for the exemplary embodiment of the application Figure One
[0022] Figure 2 Structure diagram of the liquid leakage detection circuit provided for the exemplary embodiment of the application Figure Two
[0023] Explanation of reference signs:
[0024] 10, liquid leakage detection circuit; 11, differential signal generation module; 111, first liquid leakage detection cable; 112, second liquid leakage detection cable; 12, signal comparison module; 13, logic judgment module; 131, voltage comparator; 132, logic control unit.
[0025] The specific embodiments of the present application have been shown by way of illustration in the above drawings and more details will be described in the following. These drawings and detailed description are not intended to limit the scope of the present application in any way, but to explain the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0026] It should be noted that the terms "first", "second" are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0027] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the connection between two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0028] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0029] In the above description, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification and the features of different embodiments or examples, without contradiction.
[0030] In order for those skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present application, the solutions of the related art are introduced before the technical solutions provided by the embodiments of the present application are introduced.
[0031] At present, since the liquid leakage detection cable needs to be laid along the liquid cooling pipeline, it inevitably passes through some high-frequency interference intervals during its laying process. These high-frequency interference sources can interfere with the liquid leakage detection signal, probabilistically introduce noise, and the noise can affect the level of the detection signal, so that the originally stable level signal fluctuates or abnormally changes. In the related art, it is usually determined whether the liquid leakage state occurs based on the level interval, and the abnormal change of the level easily leads to system misjudgment, thereby causing the liquid leakage false alarm. The false alarm not only causes unnecessary alarm and processing measures, increases the operation and maintenance cost, but also, when the liquid leakage really occurs, the sensitivity of the operation and maintenance personnel to the alarm is reduced due to frequent false alarms, which affects the timely processing of the real liquid leakage, which brings potential risks to the safe operation of the liquid cooling server. Therefore, how to improve the anti-interference ability of the liquid leakage detection and reduce the frequency of false alarms has become a problem to be solved in the current liquid cooling server liquid leakage detection design.
[0032] Therefore, in order to solve the above problems, the present application provides a liquid leakage detection circuit scheme. In a general liquid leakage detection circuit, a differential signal design is adopted to determine whether liquid leakage occurs by detecting the differential voltage of the differential voltage signal. By adopting the differential signal design, the influence of noise on the single-ended signal can be effectively avoided, and the problem of liquid leakage false alarm caused by the traditional single-ended detection scheme being easily disturbed by noise is significantly improved. The differential signal itself has the suppression characteristic of common-mode noise, so that the detection signal can still remain relatively stable in a complex interference environment, thereby accurately and quickly determining whether liquid leakage occurs, so that the anti-interference ability and detection precision of the liquid leakage detection are greatly improved, which helps to provide more efficient and accurate solutions for various scenarios involving liquid leakage detection.
[0033] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail in the specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in detail in some embodiments. The embodiments of the present application will be described below with reference to the drawings.
[0034] Figure 1 Structure diagram of the liquid leakage detection circuit provided by the exemplary embodiments of the present application Figure One As shown in Figure 1 The liquid leakage detection circuit 10 provided by the embodiments of the present application includes a differential signal generation module 11, a signal comparison module 12 and a logic judgment module 13, wherein:
[0035] The differential signal generation module 11 includes a first liquid leakage detection cable 111 and a second liquid leakage detection cable 112. The first liquid leakage detection cable 111 is connected to a power supply voltage through a pull-up resistor, and the second liquid leakage detection cable 112 is grounded through a pull-down resistor. The two detection cables form a differential pair of equal length and equal distance in the PCB layout, and are used to generate a differential detection signal pair.
[0036] The signal comparison module 12 has two input terminals connected to the first liquid leakage detection cable 111 and the second liquid leakage detection cable 112, respectively. Based on the differential detection signal pair, the signal comparison module 12 outputs a differential voltage signal corresponding to the impedance change between the two detection cables in real time.
[0037] The logic judgment module 13 is connected to the output terminal of the signal comparison module 12, and is used to judge whether liquid leakage occurs based on the differential voltage signal and a preset threshold voltage signal.
[0038] In a dry state, the two detection cables present an open circuit characteristic, and the differential voltage signal maintains a first steady state value. In a wet state, a conductive path is formed between the two detection cables, and the differential voltage signal jumps to a second steady state value different from the first steady state value.
[0039] In some embodiments, the resistance values of the pull-up resistor and the pull-down resistor correspond to a resistance value range of 10kΩ-100kΩ. For example, as shown in FIG. 2, the pull-up resistor and the pull-down resistor are both 51kΩ. Figure 1
[0040] The first liquid leakage detection cable 111 and the second liquid leakage detection cable 112 are key components for sensing whether there is liquid leakage. A humidity-sensitive resistor is connected between the first liquid leakage detection cable 111 and the second liquid leakage detection cable 112. The two detection cables form a differential pair of equal length and equal distance in the PCB layout, and are used to generate a differential detection signal pair. When liquid leakage occurs and contacts the first liquid leakage detection cable 111 and the second liquid leakage detection cable 112, the electrical characteristics between the two detection cables will change. The first liquid leakage detection cable 111 is connected to the power supply voltage through a pull-up resistor. The pull-up resistor functions to pull the potential of the first liquid leakage detection cable 111 to the power supply voltage level in the absence of liquid leakage or other special conditions, thereby providing a stable initial potential reference for the circuit. The second liquid leakage detection cable 112 is grounded through a pull-down resistor, which ensures that the potential of the second liquid leakage detection cable 112 remains at a low level under normal conditions, thereby forming a potential difference with the first liquid leakage detection cable 111.
[0041] Correspondingly, in the dry state, the two detection cables present an open circuit characteristic, the impedance between the two detection cables is infinite, and the signal comparison module 12 outputs a differential voltage signal corresponding to the change in impedance between the two detection cables based on the pair of differential detection signals, which is maintained at a first steady-state value, for example, 3V; in the wet state, a conductive path is formed between the two detection cables, and the signal comparison module 12 outputs a differential voltage signal corresponding to the change in impedance between the two detection cables, which jumps to a second steady-state value, for example, 0.5V, which is different from the first steady-state value.
[0042] Further, the logic judgment module 13 judges whether liquid leakage occurs based on the differential voltage signal and a preset threshold voltage signal. For example, when the differential voltage signal output by the signal comparison module 12 exceeds or is lower than the preset threshold voltage signal, the logic judgment module 13 determines that liquid leakage occurs and outputs a corresponding control signal to trigger corresponding protection measures.
[0043] In the embodiments of the present application, by adopting a differential signal design and cooperating with pull-up and pull-down resistance design, noise interference can be effectively reduced, and the problem of liquid leakage false alarm caused by traditional single-end detection scheme being easily affected by noise interference can be significantly improved. In addition, by using the signal comparison module to output a differential voltage signal corresponding to the change in impedance between the two detection cables in real time, and further using the logic judgment module to compare the differential voltage signal with the preset threshold voltage signal, rapid and accurate determination of whether liquid leakage occurs is realized, the anti-interference ability and detection precision of liquid leakage detection are greatly improved, and it is helpful to provide more efficient and accurate solutions for various scenarios involving liquid leakage detection.
[0044] In some embodiments, the signal comparison module includes an operational amplifier, the non-inverting input terminal and the inverting input terminal of the operational amplifier are respectively used as two input terminals of the signal comparison module, and the output terminal of the operational amplifier is respectively used as an output terminal of the signal comparison module.
[0045] For example, the non-inverting input terminal and the inverting input terminal of the operational amplifier are respectively used as two input terminals of the signal comparison module, that is, the first liquid leakage detection cable is connected with the non-inverting input terminal of the operational amplifier, and the second liquid leakage detection cable is connected with the inverting input terminal of the operational amplifier; the output terminal of the operational amplifier is connected with an input terminal of the logic judgment module. Correspondingly, the operational amplifier is used to output a differential voltage signal corresponding to the change in impedance between the two detection cables in real time.
[0046] In some embodiments, the logic judging module comprises a voltage comparator and a logic control unit, wherein two input terminals of the voltage comparator are connected to the output terminal of the signal comparing module and a preset threshold voltage signal, respectively, for comparing the differential voltage signal with the preset threshold voltage signal and outputting a comparison result; and an input terminal of the logic control unit is connected to an output terminal of the voltage comparator for judging whether the liquid leakage occurs according to the comparison result.
[0047] For example, Figure 2 Structure of the liquid leakage detection circuit provided by the exemplary embodiments of the present application Figure Two As shown in Figure 2 The logic judging module 13 comprises a voltage comparator 131 and a logic control unit 132, wherein two input terminals of the voltage comparator 131 are connected to the output terminal of the signal comparing module 12 and a preset threshold voltage signal, respectively, for receiving the differential voltage signal output by the signal comparing module 12 and comparing the differential voltage signal with the preset threshold voltage signal; and an input terminal of the logic control unit 132 is connected to an output terminal of the voltage comparator 131 for judging whether the liquid leakage occurs according to the comparison result.
[0048] Correspondingly, when the liquid-cooled server is in a dry state, the differential voltage signal output by the signal comparing module 12 is a first steady-state value, for example, 3V, at this time, the voltage comparator 131 compares the received 3V differential voltage signal with the preset threshold voltage signal of 1V, since 3V is greater than 1V, the voltage comparator 131 outputs a high-level signal; when the server leaks, a conductive path is formed between the two detection cables, the differential voltage signal output by the signal comparing module 12 jumps to a second steady-state value, for example, 0.5V, the voltage comparator 131 compares 0.5V with the preset threshold voltage signal of 1V, since 0.5V is less than 1V, the voltage comparator 131 outputs a low-level signal.
[0049] Further, the logic control unit 132 is configured to receive the comparison result, for example, a high-level or low-level signal, output by the voltage comparator 131, and determine whether the liquid leakage occurs according to the received high-level or low-level signal according to a preset judging logic.
[0050] In some embodiments, when judging whether the liquid leakage occurs according to the comparison result, the logic control unit is specifically configured to: if the comparison result is a high level, it is determined that the liquid leakage occurs; and if the comparison result is a low level, it is determined that the liquid leakage does not occur.
[0051] For example, when the logic control unit receives a high level signal output by the voltage comparator, it is determined that the liquid cooling server has a liquid leakage; when the logic control unit receives a low level signal output by the voltage comparator, it is determined that the liquid cooling server has no liquid leakage.
[0052] In the embodiments of the present application, by clearly corresponding the high level to the liquid leakage and the low level to no liquid leakage, the voltage signal change caused by the liquid leakage can be accurately captured, so as to effectively distinguish the real liquid leakage signal from the noise signal such as electromagnetic interference in the environment, greatly reduce the misjudgment and missed judgment probability, and effectively ensure that the detection result can accurately reflect the actual situation; in addition, the above-mentioned judgment logic is simple, clear and easy to implement, which not only simplifies the system design and development process, reduces the hardware and software cost, but also greatly facilitates the subsequent system debugging, maintenance and upgrading work, so that the operation and maintenance personnel can quickly locate the problem and adjust the parameters, which helps to ensure the long-term stable operation of the server system.
[0053] In some embodiments, the logic control unit is further configured to execute a corresponding control operation when it is determined that the liquid leakage occurs, and the control operation includes triggering an alarm device.
[0054] For example, the logic control unit is configured to trigger a corresponding control operation immediately when it is determined that the liquid leakage occurs, and the control operation includes but is not limited to activating the sound and light alarm device such as the light emitting diode (LED) warning light and the buzzer inside the case, sending a liquid leakage interrupt signal to the baseboard management controller (BMC), or starting an emergency protection process such as gradually reducing the central processing unit (CPU) power consumption and recording fault logs.
[0055] In some embodiments, the logic judgment module further includes a state latch unit, which is configured to lock the alarm state when it is determined that the liquid leakage occurs.
[0056] For example, after it is determined that the liquid leakage occurs, even if the impedance of the detection cable recovers, such as the evaporation of the liquid leakage, the alarm state is still locked and needs to be manually reset by the operation and maintenance personnel or cleared by the BMC.
[0057] In the embodiments of the present application, the state latch unit locks the alarm state, which can effectively avoid the situation that the alarm and control operation are mistakenly removed due to temporary signal fluctuation, and ensure that the system is always in an alert state before the liquid leakage problem is completely solved, and continues to take countermeasures, thereby further improving the system reliability; in addition, the continuous alarm state can provide clear fault indication for the operation and maintenance personnel, so that they can quickly locate the problem and the liquid leakage position, which helps to reduce the fault troubleshooting time and improve the maintenance efficiency.
[0058] In some embodiments, the state latching unit is a D flip-flop or an RS flip-flop.
[0059] For example, a D flip-flop with an asynchronous reset terminal, such as SN74LVC1G79, can be used for high-reliability scenarios, and a basic RS flip-flop, such as CD4043, can be used for cost-sensitive scenarios.
[0060] In some embodiments, the preset threshold voltage signal is provided by a programmable reference voltage source, which is used to adjust the liquid leakage detection sensitivity in different environments.
[0061] For example, according to the type of coolant used (such as coolant with different viscosity and conductivity), environmental temperature and humidity changes, and other factors, the programmable reference voltage source can be controlled by a host computer software or a laboratory control terminal to adjust the preset threshold voltage signal. For example, when a new type of coolant with strong conductivity is used, the preset threshold voltage can be appropriately reduced to improve the detection sensitivity; and when the environmental humidity is high and there are many interference signals, the preset threshold voltage can be appropriately increased to enhance the anti-interference ability.
[0062] In the embodiments of the present application, the preset threshold voltage signal is provided by a programmable reference voltage source, which can flexibly adjust the preset threshold voltage according to different environmental conditions and coolant characteristics, thereby ensuring accurate detection of liquid leakage in various complex environments and further improving the universality and adaptability of liquid leakage detection. In addition, by reasonably adjusting the preset threshold voltage, the sensitivity and anti-interference ability of liquid leakage detection can be optimized, the detection ability of small liquid leakage can be improved as much as possible under the premise of not false reporting, and more reliable protection for the safe operation of the liquid-cooled server is provided.
[0063] The present application also provides a mainboard comprising the liquid leakage detection circuit described in the above embodiments.
[0064] For example, in addition to the liquid leakage detection circuit, the mainboard also comprises a central processing unit, a memory unit, a storage, a power management unit, a connection interface, and the like. These components collectively constitute the core functions of the mainboard and support the overall operation of the device and user experience.
[0065] The liquid leakage detection circuit provided in the above embodiments is applied to the mainboard of the present application, which effectively improves the problem of false reporting of liquid leakage caused by noise interference in the traditional single-ended detection scheme.
[0066] The present application also provides a liquid-cooled server comprising the liquid leakage detection circuit described in the above embodiments, or the liquid-cooled server comprising the mainboard described in the above embodiments.
[0067] For example, the liquid-cooled server can be a high-density computing server suitable for large data centers. In large data centers, there are a large number of servers and intensive deployment, and the heat dissipation requirement is extremely high. By applying the liquid leakage detection circuit or the mainboard provided in the above embodiment to the liquid-cooled server of the present application, the problem of false leakage caused by the traditional single-end detection scheme being easily disturbed by noise can be effectively improved, a set of efficient and accurate liquid leakage detection protection system can be built for the liquid-cooled server, the false leakage rate can be significantly reduced, the stable and reliable operation of the liquid-cooled server in various complex environments can be ensured, and solid technical support can be provided for key application scenarios such as data centers.
[0068] In summary, the present application has at least the following advantages:
[0069] I. By adopting a differential signal design and cooperating with pull-up and pull-down resistor designs, noise interference can be effectively reduced, and the problem of false leakage caused by the traditional single-end detection scheme being easily disturbed by noise can be significantly improved. In addition, by using the signal comparison module to output the differential voltage signal corresponding to the impedance change between the two detection cables in real time, and further using the logic judgment module to compare the differential voltage signal with the preset threshold voltage signal, rapid and accurate determination of whether leakage occurs is realized, the anti-interference ability and detection accuracy of the liquid leakage detection are greatly improved, and more efficient and accurate solutions can be provided for various scenarios involving liquid leakage detection.
[0070] II. By clearly corresponding high level to liquid leakage and low level to no liquid leakage, the voltage signal change caused by liquid leakage can be accurately captured, thereby effectively distinguishing between real liquid leakage signals and noise signals such as electromagnetic interference in the environment, greatly reducing the probability of false judgment and missed judgment, and effectively ensuring that the detection result accurately reflects the actual situation. In addition, the above judgment logic is simple, clear and easy to implement, which not only simplifies the system design and development process, reduces hardware and software costs, but also greatly facilitates subsequent system debugging, maintenance and upgrading, so that operation and maintenance personnel can quickly locate problems and adjust parameters, which helps to ensure the long-term stable operation of the server system.
[0071] III. By locking the alarm state through the state latching unit, the situation that the alarm and control operation are mistakenly removed due to temporary signal fluctuations can be effectively avoided, and the system is always in an alert state before the liquid leakage problem is completely solved, and continuous measures are taken, which further improves the system reliability. In addition, the continuous alarm state can provide clear fault indication for the operation and maintenance personnel, so that they can quickly locate the problem and the liquid leakage position, which helps to reduce the fault troubleshooting time and improve the maintenance efficiency.
[0072] Four, by setting the preset threshold voltage signal provided by the programmable reference voltage source, the preset threshold voltage can be flexibly adjusted according to different environmental conditions and coolant characteristics, so as to ensure that the liquid leakage condition can be accurately detected in various complex environments, and the universality and adaptability of the liquid leakage detection are further improved. In addition, by reasonably adjusting the preset threshold voltage, the sensitivity and anti-interference ability of the liquid leakage detection can be optimized, the detection ability of the micro liquid leakage is improved as much as possible under the premise of ensuring no false alarm, and more reliable protection is provided for the safe operation of the liquid cooling server.
[0073] Finally, it should be noted that: other embodiments of the application will be readily apparent to those skilled in the art with the disclosure of the specification and practice of the application. The application is intended to cover any variations, uses, or adaptations of the application that follow the general principles of the application and include common knowledge or conventional technical means in the art that are not disclosed in the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.
Claims
1. A liquid leakage detection circuit, characterized in that: include: Differential signal generation module, signal comparison module and logic judgment module, where: The differential signal generation module includes a first leakage detection cable and a second leakage detection cable, wherein the first leakage detection cable is connected to a supply voltage via a pull-up resistor, and the second leakage detection cable is connected to ground via a pull-down resistor. The two detection cables form a differential trace pair of equal length and distance in a printed circuit board (PCB) layout, for generating a differential detection signal pair; The two input ends of the signal comparison module are respectively connected to the first leakage detection cable and the second leakage detection cable, and are used to output a differential voltage signal corresponding to the impedance change between the two detection cables in real time based on the differential detection signal pair; The logic judgment module is connected to the output end of the signal comparison module and is used to judge whether leakage occurs based on the differential voltage signal and a preset threshold voltage signal; In the dry state, an open circuit characteristic is presented between the two detection cables, and the differential voltage signal maintains a first steady-state value; in the wet state, a conductive path is formed between the two detection cables, and the differential voltage signal jumps to a second steady-state value different from the first steady-state value.
2. The liquid leakage detection circuit according to claim 1, characterized in that: The signal comparison module includes an operational amplifier, wherein the in-phase input terminal and the inverting input terminal of the operational amplifier serve as two input terminals of the signal comparison module respectively, and the output terminals of the operational amplifier serve as output terminals of the signal comparison module respectively.
3. The liquid leakage detection circuit according to claim 1 or 2, characterized in that: The logic judgment module includes a voltage comparator and a logic control unit, wherein: The two input terminals of the voltage comparator serve as the two input terminals of the logic judgment module, and are respectively connected to the output terminal of the signal comparison module and the preset threshold voltage signal, and are used to compare the differential voltage signal with the preset threshold voltage signal and output a comparison result; The input end of the logic control unit is connected to the output end of the voltage comparator, and is used to determine whether liquid leakage occurs according to the comparison result.
4. The liquid leakage detection circuit according to claim 3, characterized in that: When used to determine whether liquid leakage occurs according to the comparison result, the logic control unit is specifically used to: If the comparison result is a high level, it is determined that leakage has occurred; If the comparison result is a low level, it is determined that no leakage has occurred.
5. The liquid leakage detection circuit according to claim 3, characterized in that: The logic control unit is further used for: When it is determined that a liquid leakage occurs, a corresponding control operation is performed, and the control operation includes triggering an alarm device.
6. The liquid leakage detection circuit according to claim 3, characterized in that: The logic judgment module further includes a state latch unit, and the state latch unit is used to lock the alarm state when it is determined that leakage occurs.
7. The liquid leakage detection circuit according to claim 6, characterized in that: The state latch unit is a data latch trigger or a reset-set trigger.
8. The liquid leakage detection circuit according to claim 1 or 2, characterized in that: The preset threshold voltage signal is provided by a programmable reference voltage source and is used to adjust the sensitivity of leakage detection in different environments.
9. A motherboard, characterized in that: The device comprises the liquid leakage detection circuit according to any one of claims 1 to 8.
10. A liquid cooling server, characterized in that: The liquid cooling server includes the liquid leakage detection circuit according to any one of claims 1 to 8, or the liquid cooling server includes the mainboard according to claim 9.
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