Liquid leakage detection circuit

Abstract

The liquid leakage detection circuit comprises a polarity control unit, a threshold comparison unit and at least one liquid leakage induction unit, the liquid leakage induction unit is provided with a first induction line and a second induction line, the first induction line and the second induction line are connected to the polarity control unit, and the threshold comparison unit is connected with the first induction line; the liquid leakage sensing unit is configured to control the on-off state between the first sensing line and the second sensing line according to the liquid leakage state of the corresponding liquid leakage detection point; the polarity control unit is configured to provide corresponding liquid leakage detection voltages for the first induction line and the second induction line in response to the received liquid leakage detection signal, and to detect the liquid leakage according to the on-off state between the first induction line and the second induction line. Adjusting the relative voltage relation between the liquid leakage detection voltage of the first induction line and a preset reference voltage; the threshold comparison unit is configured to output a liquid leakage detection result according to a comparison result of the liquid leakage detection voltage of the first induction line and a preset reference voltage.

Description

Technical Field

[0001] This application relates to the technical field of liquid leakage detection, and particularly relates to a liquid leakage detection circuit. Background Art

[0002] The rapid development of artificial intelligence has driven a surge in the demand for computing power and high-throughput chips. From GPUs to network acceleration engines, the power consumption of various ASICs and general-purpose chips is increasing exponentially. Heat dissipation has become a key factor restricting the high-power integration of computing power and network communication equipment. The current mainstream heat dissipation solution uses a sheet or toothed radiator plus air cooling, and this technology cannot meet the heat dissipation requirements of high heat flux density chips. Liquid cooling technology can effectively improve the system heat dissipation efficiency. Among them, indirect cold plate liquid cooling has characteristics such as relatively simple structure and the cooling medium does not require insulation, so it can balance the heat management efficiency and economy.

[0003] Among them, the connection point between the conduit and the cold plate is usually completed by welding or plugging, but the connection point is prone to reduce the airtightness under working conditions such as vibration, resulting in leakage of the cooling medium, and then causing a short circuit abnormality in the circuit on the board. Therefore, there is an urgent need for a liquid leakage detection tool that can timely and effectively locate and report the liquid leakage fault, and isolate the single board with liquid leakage to prevent abnormal circuit on the board. Summary of the Invention

[0004] This application provides a liquid leakage detection circuit.

[0005] An embodiment of this application provides a liquid leakage detection circuit, which includes: a polarity control unit, a threshold comparison unit, and at least one liquid leakage induction unit. Each liquid leakage induction unit is correspondingly arranged with a liquid leakage detection point. The liquid leakage induction unit has a first induction wire and a second induction wire. The first induction wire and the second induction wire are respectively connected to the polarity control unit, and the threshold comparison unit is connected to the first induction wire;

[0006] The liquid leakage induction unit is configured to control the on-off state between the first induction wire and the second induction wire according to the liquid leakage state of the corresponding liquid leakage detection point;

[0007] The polarity control unit is configured to, in response to receiving a liquid leakage detection signal, respectively provide corresponding liquid leakage detection voltages to the first induction wire and the second induction wire, and adjust the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction wire and a preset reference voltage according to the on-off state between the first induction wire and the second induction wire;

[0008] The threshold comparison unit is configured to output a liquid leakage detection result according to the comparison result between the liquid leakage detection voltage of the first induction wire and the preset reference voltage.

[0009] According to the liquid leakage detection circuit of the embodiments of the present application, when the liquid leakage detection point is in different liquid leakage states, the corresponding liquid leakage induction unit can control the first induction line and the second induction line to be in different on-off states, and the polarity control unit controls the magnitudes of the liquid leakage detection voltages of the first induction line and the second induction line, so that the liquid leakage detection voltage of the first induction line is configured to satisfy different relative voltage magnitude relationships with the preset reference voltage in different on-off states. Thus, by detecting the change in the relative voltage magnitude between the liquid leakage detection voltage of the first induction line and the preset reference voltage through the threshold comparison unit, the on-off state between the first induction line and the second induction line can be determined, and further, it can be determined whether there is liquid leakage at the liquid leakage detection point corresponding to the liquid leakage induction unit, realizing liquid leakage detection. In the embodiments of the present application, by correspondingly arranging a liquid leakage induction unit at each liquid leakage detection point, and through the voltage control of the polarity control unit and the voltage detection of the threshold comparison unit, the liquid leakage detection of each liquid leakage detection point can be realized, the liquid leakage detection point where liquid leakage occurs can be accurately located, and the liquid leakage detection points and their corresponding liquid leakage detection units can be flexibly expanded and configured.

[0010] More descriptions about the above embodiments and other aspects of the present application and their implementation manners are provided in the accompanying drawings description, the specific implementation manner, and the claims. Description of the Drawings

[0011] In the drawings of the embodiments of the present application:

[0012] Figure 1 A schematic diagram showing the composition structure of a liquid leakage detection circuit provided by the embodiments of the present application is shown.

[0013] Figure 2 A schematic diagram showing the composition structure of a liquid leakage induction unit provided by the embodiments of the present application is shown.

[0014] Figure 3 A schematic diagram showing the structure of a liquid leakage induction body provided by the embodiments of the present application is shown.

[0015] Figure 4 A schematic diagram showing the composition structure of another liquid leakage detection circuit provided by the embodiments of the present application is shown.

[0016] Figure 5 A schematic diagram showing the composition structure of a disconnection detection control unit provided by the embodiments of the present application is shown.

[0017] Figure 6 A schematic diagram showing the positional relationship between a liquid leakage induction body and a unidirectional conductor provided by the embodiments of the present application is shown.

[0018] Figure 7 A schematic diagram showing the composition structure of a unidirectional conductor provided by the embodiments of the present application is shown.

[0019] Figure 8 Schematic diagram of an equivalent circuit structure of a liquid leakage inductor and a unidirectional conductor provided by an embodiment of the present application.

[0020] Figure 9 Schematic diagram of an equivalent circuit structure of multiple liquid leakage inductors and multiple unidirectional conductors provided by an embodiment of the present application.

[0021] Figure 10 Schematic diagram of a composition structure of a polarity control unit provided by an embodiment of the present application.

[0022] Figure 11 Schematic diagram of a composition structure of a first control circuit provided by an embodiment of the present application.

[0023] Figure 12 Schematic diagram of a composition structure of a second control circuit provided by an embodiment of the present application.

[0024] Figure 13 Schematic diagram of an implementation circuit structure of a polarity control unit provided by an embodiment of the present application.

[0025] Figure 14 Schematic diagram of a composition structure of a threshold comparison unit provided by an embodiment of the present application.

[0026] Figure 15 Schematic diagram of an implementation circuit structure of a threshold comparison unit provided by an embodiment of the present application.

[0027] Figure 16 Schematic diagram of a composition structure of another liquid leakage detection circuit provided by an embodiment of the present application.

[0028] Figure 17 Schematic diagram of a composition structure of yet another liquid leakage detection circuit provided by an embodiment of the present application.

[0029] Figure 18 Schematic diagram of a connection relationship among a processing unit, an interface expansion unit, and a threshold comparison unit in an embodiment of the present application.

[0030] Figure 19 Schematic diagram of a detection scenario of a liquid leakage detection circuit in an embodiment of the present application. Detailed implementation manners

[0031] To enable those skilled in the art to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] The present application will be described more fully hereinafter with reference to the accompanying drawings. However, the illustrated embodiments may be embodied in different forms, and the present application should not be construed as limited to the embodiments set forth below. On the contrary, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0033] The accompanying drawings of the embodiments of the present application are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the detailed embodiments, they are used to explain the present application and do not constitute a limitation to the present application. By describing the detailed embodiments with reference to the accompanying drawings, the above and other features and advantages will become more apparent to those skilled in the art.

[0034] The present application may be described with reference to the plan views and / or cross-sectional views by means of the ideal schematic diagrams of the present application. Therefore, the example illustrations may be modified according to the manufacturing technology and / or tolerances.

[0035] In the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0036] The terms used in the present application are only for describing specific embodiments and are not intended to limit the present application. As used in the present application, the term "and / or" includes any and all combinations of one or more of the related listed items. As used in the present application, the singular forms "a" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. As used in the present application, the terms "comprising", "made of", specify the presence of the stated features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their groups.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used in the present application have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present application, and will not be interpreted as having an idealized or overly formal meaning unless the present application clearly so defines.

[0038] The present application is not limited to the embodiments shown in the accompanying drawings, but includes modifications to the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be restrictive.

[0039] In the related art, in the indirect cold plate liquid cooling system of a chip, the connection point between the conduit and the cold plate is usually connected through welding or plugging. However, the connection point is likely to reduce the airtightness under working conditions such as vibration, resulting in leakage of the cooling medium, and further causing short - circuit abnormalities in the circuits on the board. Therefore, there is an urgent need for a liquid leakage detection tool that can timely and effectively locate and report the liquid leakage fault, and isolate the single board with liquid leakage to prevent abnormal circuits on the board. The liquid leakage detection tools used in the related art usually have problems such as complex winding assembly, difficult to accurately locate the leakage point, and complex broken - wire detection.

[0040] In order to effectively improve the technical problems existing in the above - mentioned related art, an embodiment of the present application provides a liquid leakage detection circuit.

[0041] Figure 1 The composition structure diagram of a liquid leakage detection circuit provided by an embodiment of the present application is shown, as Figure 1 As shown, an embodiment of the present application provides a liquid leakage detection circuit 10. The liquid leakage detection circuit 10 includes: a polarity control unit 11, a threshold comparison unit 12, and at least one liquid leakage induction unit 13. Each liquid leakage induction unit 13 is correspondingly arranged with a liquid leakage detection point. The liquid leakage induction unit 13 has a first induction wire A and a second induction wire B. The first induction wire A and the second induction wire B are respectively connected to the polarity control unit 11, and the threshold comparison unit 12 is connected to the first induction wire A.

[0042] Among them, the liquid leakage induction unit 13 is configured to control the on - off state between the first induction wire A and the second induction wire B according to the liquid leakage state of the corresponding liquid leakage detection point; the polarity control unit 11 is configured to, in response to receiving a liquid leakage detection signal, provide corresponding liquid leakage detection voltages to the first induction wire A and the second induction wire B respectively, and adjust the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction wire A and a preset reference voltage according to the on - off state between the first induction wire A and the second induction wire B; the threshold comparison unit 12 is configured to output a liquid leakage detection result according to the comparison result between the liquid leakage detection voltage of the first induction wire A and the preset reference voltage.

[0043] In the embodiment of the present application, the on - off state between the first induction wire A and the second induction wire B is an electrically conductive state or a disconnected state, and the liquid leakage state of the liquid leakage detection point is a state of having liquid leakage or a state of no liquid leakage; when the corresponding liquid leakage detection point is in a state of having liquid leakage, the liquid leakage induction unit 13 is turned on in response to the liquid leakage at the corresponding liquid leakage detection point to control the state between the first induction wire A and the second induction wire B to be in an electrically conductive state; when the corresponding liquid leakage detection point is in a state of no liquid leakage, the liquid leakage induction unit 13 is not turned on in response to no liquid leakage at the corresponding liquid leakage detection point, so that the state between the first induction wire A and the second induction wire B is in a disconnected state.

[0044] In some embodiments, a liquid leakage detection signal may be provided to the polarity control unit 11 by an external circuit (such as a processing unit), so that the liquid leakage detection circuit 10 enters the liquid leakage detection mode and enables the liquid leakage detection function. Among them, the polarity control unit 11 is controlled by the liquid leakage detection signal provided by the external circuit. In response to receiving the liquid leakage detection signal from the external circuit, corresponding liquid leakage detection voltages are provided to the first induction line A and the second induction line B respectively according to the liquid leakage detection signal, and according to the on / off state between the first induction line A and the second induction line B, the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction line A and a preset reference voltage is adjusted, so that when the first induction line A and the second induction line B are in different on / off states, the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction line A and the preset reference voltage satisfies different conditions.

[0045] For example, when the first induction line A and the second induction line B are in an open state, the polarity control unit 11 can control the liquid leakage detection voltage provided to the first induction line A to be in a state greater than the preset reference voltage, and when the first induction line A and the second induction line B are in an electrically conductive state, the polarity control unit 11 can control the liquid leakage detection voltage provided to the first induction line A to change to a state less than the preset reference voltage.

[0046] In the embodiments of the present application, since the polarity control unit 11 can adjust the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction line A and the preset reference voltage according to the on / off state between the first induction line A and the second induction line B, so that the relative voltage magnitude relationship between the liquid leakage detection voltage of the first induction line A and the preset reference voltage is different in different on / off states. Therefore, the threshold comparison unit 12 can determine the on / off state between the first induction line A and the second induction line B by detecting the comparison result of the liquid leakage detection voltage of the first induction line A and the preset reference voltage, and thus determine the liquid leakage state of the liquid leakage detection point corresponding to the liquid leakage induction unit 13 to obtain the liquid leakage detection result.

[0047] Among them, when the threshold comparison unit 12 determines that the first induction line A and the second induction line B are in a conductive state according to the comparison result of the liquid leakage detection voltage of the first induction line A and the preset reference voltage, it indicates that the liquid leakage detection point is in a state of liquid leakage, and the output liquid leakage detection result can be information indicating that there is liquid leakage at the liquid leakage detection point; while when the threshold comparison unit 12 determines that the first induction line A and the second induction line B are in an open state according to the comparison result of the liquid leakage detection voltage of the first induction line A and the preset reference voltage, it indicates that the liquid leakage detection point is in a non-liquid leakage state, and the output liquid leakage detection result can be information indicating that there is no liquid leakage at the liquid detection point.

[0048] According to the liquid leakage detection circuit of the embodiments of the present application, when the liquid leakage detection point is in different liquid leakage states, the corresponding liquid leakage induction unit can control the first induction line and the second induction line to be in different on-off states, and the polarity control unit controls the magnitudes of the liquid leakage detection voltages of the first induction line and the second induction line, so that the liquid leakage detection voltage of the first induction line is configured to satisfy different relative voltage magnitude relationships with the preset reference voltage in different on-off states. Thus, by detecting the change in the relative voltage magnitude between the liquid leakage detection voltage of the first induction line and the preset reference voltage through the threshold comparison unit, the on-off state between the first induction line and the second induction line can be determined, and further whether there is liquid leakage at the liquid leakage detection point corresponding to the liquid leakage induction unit can be determined, realizing liquid leakage detection. Compared with the related art, the liquid leakage detection circuit of the embodiments of the present application has a relatively simple structure, is easy to assemble, and can achieve fast and accurate liquid leakage detection. By correspondingly setting a liquid leakage induction unit at each liquid leakage detection point, and through the voltage control of the polarity control unit and the voltage detection of the threshold comparison unit, the liquid leakage detection of each liquid leakage detection point can be realized, the liquid leakage detection point where liquid leakage occurs can be accurately located, and the liquid leakage detection points and their corresponding liquid leakage detection units can be flexibly expanded and configured.

[0049] It should be noted that Figure 1 Only the case of setting one liquid leakage induction unit 13 is exemplarily shown. The embodiments of the present application include but are not limited to this case. In the embodiments of the present application, two or more liquid leakage induction units 13 can also be set, and specifically, they can be correspondingly configured according to the number of liquid leakage detection points that need to be configured actually. Among them, the liquid leakage induction units 13 are set in one-to-one correspondence with the liquid leakage detection points.

[0050] In some embodiments, the number of liquid leakage induction units 13 is multiple, the liquid leakage induction units 13 are set in one-to-one correspondence with the liquid leakage detection points, each liquid leakage induction unit 13 is set at the corresponding liquid leakage detection point, the second induction lines B of the multiple liquid leakage induction units 13 are electrically connected and connected to the polarity control unit 11, the first induction lines A of the multiple liquid leakage induction units 13 are respectively connected to the polarity control unit 11, and the first induction lines A of the multiple liquid leakage induction units 13 are respectively connected to the threshold comparison unit 12.

[0051] Figure 2 The composition structure diagram of a liquid leakage induction unit provided by the embodiments of the present application is shown. In some embodiments, such as Figure 2As shown, the liquid leakage induction unit 13 further includes a liquid leakage inductor 131. The first induction wire A and the second induction wire B are respectively connected to both ends of the liquid leakage inductor 131. Among them, one end of the first induction wire A is connected to one end of the liquid leakage inductor 131, and the other end of the first induction wire A is connected to the polarity control unit 11 and the threshold comparison unit 12. One end of the second induction wire B is connected to the other end of the liquid leakage inductor 131, and the other end of the second induction wire B is connected to the polarity control unit 11.

[0052] In some embodiments, the liquid leakage inductor 131 is configured to conduct electricity in response to liquid leakage occurring at the corresponding liquid leakage detection point, so as to control the conduction between the first induction wire A and the second induction wire B, that is, the first induction wire A and the second induction wire B are in an electrically conductive state, or not conduct electricity in response to no liquid leakage at the corresponding liquid leakage detection point, so as to control the disconnection between the first induction wire A and the second induction wire B, that is, the first induction wire A and the second induction wire B are in a disconnected state.

[0053] In some embodiments, both the first induction wire A and the second induction wire B are low-impedance wires, and there are no special restrictions on the preparation materials of the first induction wire A and the second induction wire B.

[0054] Figure 3 The structural schematic diagram of a liquid leakage inductor provided by an embodiment of the present application is shown. In some embodiments, as Figure 3 As shown, the liquid leakage inductor 131 includes a conductive polymer layer 1311 and an adhesive layer 1312. The adhesive layer 1312 is pasted on the corresponding liquid leakage detection point; the first induction wire A and the second induction wire B are respectively connected to both ends of the conductive polymer layer 1311. The conductive polymer layer 1311 is configured to conduct electricity in response to liquid leakage occurring at the corresponding liquid leakage detection point, so as to make the first induction wire A and the second induction wire B conduct, or not conduct electricity in response to no liquid leakage at the corresponding liquid leakage detection point, so as to make the first induction wire A and the second induction wire B disconnect.

[0055] Among them, the adhesive layer 1312 can be made of an adhesive material with high-temperature-resistant and pasteable characteristics. Through the adhesive layer 1312, the liquid leakage inductor 131 can be directly pasted on the corresponding liquid leakage detection point. Compared with the winding detection method used in the related art, the assembly is more convenient, and the flexibility and scalability are stronger. The conductive polymer layer 1311 is made of a conductive polymer material that can conduct electricity with low resistance when encountering water. By using the physical property of the conductive polymer layer 1311 to conduct electricity when encountering water, the on-off state between the first induction wire A and the second induction wire B at both ends can be controlled.

[0056] In some embodiments, as Figure 3As shown, the first induction wire A is connected to one end of the conductive polymer layer 1311 through the first conductive structure 1313, and the second induction wire B is connected to the other end of the conductive polymer layer 1311 through the second conductive structure 1314. In some embodiments, the first conductive structure 1313 and the second conductive structure 1314 can be implemented using conductive buses or busbars.

[0057] In some embodiments, in combination with Figure 3 As shown, the first induction wire A and the second induction wire B can be isolated by an insulating layer (not shown in the figure).

[0058] In some embodiments, such as Figure 3 As shown, the liquid leakage inductor 131 can be a sheet-like and pasteable structure, with conductive polymer layers 1311 on both its top and bottom surfaces, an adhesive layer 1312 on its bottom surface, a first conductive structure 1313 on its left side surface, and a second conductive structure 1314 on its right side surface.

[0059] It should be noted that the specific shape structure and size settings of the liquid leakage inductor 131 in the embodiments of the present application are not particularly limited. The liquid leakage inductor 131 can also be constructed in other shapes, and the size of the liquid leakage inductor 131 can be set according to the area requirements of the liquid leakage detection point. Among them, the length and width dimensions of the liquid leakage inductor 131 can have multiple size options, and the thickness dimension of the liquid leakage inductor can be controlled at the millimeter level to adapt to various detection space requirement limitations.

[0060] Figure 4 Shows a schematic diagram of the composition structure of another liquid leakage detection circuit provided by the embodiments of the present application. In some embodiments, such as Figure 4 As shown, the liquid leakage detection circuit 10 further includes a disconnection detection control unit 14, and the first induction wire A and the second induction wire B are also respectively connected to the disconnection detection control unit 14; wherein, one end of the disconnection detection control unit 14 is connected to the first induction wire A, and the other end of the disconnection detection control unit 14 is connected to the second induction wire B.

[0061] In some embodiments, the disconnection detection control unit 14 is configured to control the on / off state between the first induction wire A and the second induction wire B according to the voltages of the first induction wire A and the second induction wire B; the polarity control unit 11 is also configured to, in response to receiving a disconnection detection signal, provide corresponding disconnection detection voltages to the first induction wire A and the second induction wire B respectively, and adjust the relative voltage magnitude relationship between the disconnection detection voltage of the first induction wire A and a preset reference voltage according to the on / off state between the first induction wire A and the second induction wire B; the threshold comparison unit 12 is also configured to output a disconnection detection result according to the comparison result between the disconnection detection voltage of the first induction wire A and the preset reference voltage.

[0062] In some embodiments, the disconnection detection control unit 14 is turned on in response to the voltages of the first sensing line A and the second sensing line B satisfying a preset condition, so as to control the first sensing line A and the second sensing line B to be in an electrically conductive state; the disconnection detection control unit 14 is turned off in response to the voltages of the first sensing line A and the second sensing line B not satisfying the preset condition, so as to make the first sensing line A and the second sensing line B in a disconnected state.

[0063] In some embodiments, a disconnection detection signal may be provided to the polarity control unit 11 by an external circuit (such as a processing unit), so that the liquid leakage detection circuit 10 enters the disconnection detection mode and enables the disconnection detection function. Among them, the polarity control unit 11 is controlled by the disconnection detection signal provided by the external circuit. In response to receiving the disconnection detection signal from the external circuit, the polarity control unit 11 provides corresponding disconnection detection voltages to the first sensing line A and the second sensing line B respectively, and adjusts the relative voltage magnitude relationship between the disconnection detection voltage of the first sensing line A and a preset reference voltage according to the on / off state between the first sensing line A and the second sensing line B, so that when the first sensing line A and the second sensing line B are in different on / off states, the relative voltage magnitude relationship between the disconnection detection voltage of the first sensing line A and the preset reference voltage satisfies different relationships.

[0064] In some embodiments, in the disconnection detection mode, the polarity control unit 11 controls the disconnection detection voltage provided to the first sensing line A to be in a state less than the preset reference voltage, and the disconnection detection voltage provided to the first sensing line A by the polarity control unit 11 and the disconnection detection voltage provided to the second sensing line B satisfy the preset condition, and the disconnection detection control unit 14 controls the first sensing line A and the second sensing line B to be in an electrically conductive state; when any one of the first sensing line A and the second sensing line B is in a disconnected state, resulting in the first sensing line A and the second sensing line B being in a disconnected state, the polarity control unit 11 can control the disconnection detection voltage provided to the first sensing line A to change to a state greater than the preset reference voltage. In this way, the relative voltage magnitude relationship between the liquid leakage detection voltage of the first sensing line A and the preset reference voltage can be made to be different in different on / off states. Therefore, the threshold comparison unit 12 can determine the on / off state between the first sensing line A and the second sensing line B by detecting the comparison result between the disconnection detection voltage of the first sensing line A and the preset reference voltage, so as to determine whether the first sensing line A and the second sensing line B are disconnected and obtain the disconnection detection result.

[0065] Among them, when the threshold comparison unit 12 determines that the first induction line A and the second induction line B are in a conducting state according to the comparison result between the disconnection detection voltage of the first induction line A and the preset reference voltage, it indicates that there is no disconnection in the first induction line A and the second induction line B, and the output disconnection detection result can be information indicating that there is no disconnection in the first induction line A and the second induction line B; while when the threshold comparison unit 12 determines that the first induction line A and the second induction line B are in a disconnected state according to the comparison result between the disconnection detection voltage of the first induction line A and the preset reference voltage, it indicates that there is a disconnection in the first induction line A and the second induction line B, and the output disconnection detection result can be information indicating that there is a disconnection in the first induction line A and the second induction line B.

[0066] In some embodiments, when performing leakage detection in the leakage detection mode, regardless of the on / off state between the first induction line A and the second induction line B, the leakage detection voltages provided by the polarity control unit 11 to the first induction line A and the second induction line B are both configured not to meet the above preset conditions, so as to control the disconnection detection control unit 14 to remain in a non-conducting state in the leakage detection mode, thereby effectively avoiding interference with the leakage detection caused by the conduction of the disconnection detection control unit 14.

[0067] Similarly, in order to avoid interference with the disconnection detection caused by the conduction of the leakage induction unit 13, a disconnection detection signal can be provided to the polarity control unit 11 through an external circuit (such as a processing unit) when the leakage detection point is in a non-leakage state, so that the leakage detection circuit 10 enters the disconnection detection mode and enables the disconnection detection function; when performing disconnection detection in the disconnection detection mode, regardless of the on / off state between the first induction line A and the second induction line B, the disconnection detection voltages provided by the polarity control unit 11 to the first induction line A and the second induction line B are both configured to meet the above preset conditions.

[0068] In other words, in the leakage detection mode, the leakage detection voltages provided by the polarity control unit 11 to the first induction line A and the second induction line B are configured not to meet the above preset conditions, and the disconnection detection control unit 14 is cut off in response to the voltages of the first induction line A and the second induction line B not meeting the preset conditions; in the disconnection detection mode, the leakage detection voltages provided by the polarity control unit 11 to the first induction line A and the second induction line B are configured to meet the above preset conditions, and the disconnection detection control unit 14 is conducted in response to the voltages of the first induction line A and the second induction line B meeting the preset conditions.

[0069] In some embodiments, the liquid leakage detection signal and the wire break detection signal provided by the external circuit are different level voltage signals respectively. The external circuit can provide the liquid leakage detection signal or the wire break detection signal to the polarity control unit 11 of the liquid leakage detection circuit, so as to realize the switching of the liquid leakage detection circuit between the liquid leakage detection mode and the wire break detection mode. For example, the liquid leakage detection signal is a low-level voltage signal, and the wire break detection signal is a high-level voltage signal; or, the liquid leakage detection signal is a high-level voltage signal, and the wire break detection signal is a low-level voltage signal.

[0070] Figure 5 The schematic diagram of the composition structure of a wire break detection control unit provided by an embodiment of the present application is shown. In some embodiments, as Figure 5 shown, the wire break detection control unit 14 includes a unidirectional conductor 141, and the first induction wire A and the second induction wire B are respectively connected to both ends of the unidirectional conductor 141; wherein, one end of the first induction wire A is connected to one end of the unidirectional conductor 141, and one end of the second induction wire B is connected to the other end of the unidirectional conductor 141; the unidirectional conductor 141 is configured to conduct in response to the voltages of the first induction wire A and the second induction wire B satisfying a preset condition, so as to control the first induction wire A and the second induction wire B to conduct.

[0071] In some embodiments, according to the unidirectional conduction characteristic of the unidirectional conductor 141, the above preset condition can be configured such that the voltage difference between the voltage of the second induction wire B and the voltage of the first induction wire A is greater than the conduction voltage of the unidirectional conductor 141. When the voltages of the second induction wire B and the first induction wire A satisfy the preset condition, the unidirectional conductor 141 is in the conduction state, and when the voltages of the second induction wire B and the first induction wire A do not satisfy the preset condition, the unidirectional conductor 141 is in the cut-off state.

[0072] Figure 6 The schematic diagram of the positional relationship between a liquid leakage inductor and a unidirectional conductor provided by an embodiment of the present application is shown. In some embodiments, in combination with Figure 3 and Figure 6 shown, the unidirectional conductor 141 can be disposed in the liquid leakage inductor 131. Wherein, the unidirectional conductor 141 is disposed between the conductive polymer layer 1311 and the adhesive layer 1312 of the liquid leakage inductor 131. The first induction wire A is further connected to one end of the unidirectional conductor 141 through a first conductive structure 1313, and the second induction wire B is further connected to the other end of the unidirectional conductor 141 through a second conductive structure 1314.

[0073] In some embodiments, the unidirectional conductor 141 is made of a unidirectional conductive dielectric material with unidirectional conductive characteristics. By filling a unidirectional conduction dielectric material between the conductive polymer layer 1311 and the adhesive layer 1312 of the liquid leakage inductor 131, the unidirectional conductor 141 is formed.

[0074] Figure 7 Shows a schematic diagram of the composition structure of a unidirectional conductor provided by an embodiment of the present application. In some embodiments, as Figure 7 shown, the unidirectional conductor 141 includes a PN junction device 1411. The PN junction device 1411 has a P-type region and an N-type region. The first induction wire A is connected to the N-type region, and the second induction wire B is connected to the P-type region.

[0075] In some embodiments, the voltage of the first induction wire A and the second induction wire B is controlled by the polarity control unit 11. Utilizing the unidirectional conduction characteristic of the PN junction device 1411, the PN junction device 1411 can be in a conducting or cutoff state under different circumstances, thereby realizing the control of the on-off state between the first induction wire A and the second induction wire B. Among them, the PN junction device 1411 has a fixed conduction voltage. For example, the conduction voltage is 0.7V. The PN junction device 1411 conducts in the forward direction and cuts off in the reverse direction. When a positive voltage V P is applied to the P terminal of the PN junction device 1411 and a negative voltage V N is applied to the N terminal of the PN junction device 1411, and V P -V N > the conduction voltage, there is a continuous current flowing from the P terminal to the N terminal of the PN junction device 1411. The above preset condition can be configured as the voltage difference between the voltage of the second induction wire B and the voltage of the first induction wire A being greater than the conduction voltage of the PN junction device 1411. When the voltage of the second induction wire B and the voltage of the first induction wire A meet the preset condition, the PN junction device 1411 is in a conducting state, making the first induction wire A and the second induction wire B in a conducting state; while when the voltage of the second induction wire B and the voltage of the first induction wire A do not meet the preset condition, the PN junction device 1411 is in a cutoff state, making the first induction wire A and the second induction wire B in a disconnected state.

[0076] Figure 8 Shows a schematic diagram of the equivalent circuit structure of a liquid leakage inductor and a unidirectional conductor provided by an embodiment of the present application. In some embodiments, as Figure 8 shown, the liquid leakage inductor 131 includes a conductive polymer layer 1311, and the unidirectional conductor 141 includes a PN junction device 1411; one end of the first induction wire A is connected to one end of the conductive polymer layer 1311 and is connected to the N-type region of the PN junction device 1411; one end of the second induction wire B is connected to the other end of the conductive polymer layer 1311 and is connected to the P-type region of the PN junction device 1411.

[0077] It should be noted that Figure 8 only an exemplary case of the equivalent circuit structure of one liquid leakage inductor and one unidirectional conductor is shown. Embodiments of the present application include but are not limited to this case.

[0078] Figure 9 Schematic diagram of the equivalent circuit structure of multiple liquid leakage sensors and multiple unidirectional conductors provided by the embodiments of the present application. In some embodiments, as Figure 9 shown, the number of liquid leakage sensing units 13 is multiple. Correspondingly, the number of liquid leakage sensors 131 is multiple. Each liquid leakage sensor 131 includes a conductive polymer layer 1311. The disconnection detection control unit 14 is provided in one-to-one correspondence with the liquid leakage sensing unit 13. Correspondingly, the unidirectional conductor 141 is provided in one-to-one correspondence with the liquid leakage sensor 131. Each unidirectional conductor 141 includes a PN junction device 1411.

[0079] As Figure 9 shown, in each liquid leakage sensing unit 13 and the corresponding disconnection detection control unit 14, one end of the first sensing wire A is connected to one end of the conductive polymer layer 1311 and is connected to the N-type region of the PN junction device 1411. One end of the second sensing wire B is connected to the other end of the conductive polymer layer 1311 and is connected to the P-type region of the PN junction device 1411. In addition, the second sensing wires B of multiple liquid leakage sensing units 13 are electrically connected.

[0080] Figure 10 Schematic diagram of the composition structure of a polarity control unit provided by the embodiments of the present application. In some embodiments, as Figure 10 shown, the polarity control unit 11 includes at least one first control circuit 111 and a second control circuit 112; the first control circuit 111 is configured in one-to-one correspondence with the liquid leakage sensing unit 13. The first sensing wire A of the liquid leakage sensing unit 13 is connected to the corresponding first control circuit 111. The second sensing wire B of at least one liquid leakage sensing unit 13 is connected to the second control circuit 112.

[0081] In some embodiments, in the liquid leakage detection mode, the first control circuit 111 is configured to provide a first liquid leakage detection voltage to the first sensing wire A of the corresponding liquid leakage sensing unit 13 in response to receiving a liquid leakage detection signal. The first liquid leakage detection voltage is greater than a preset reference voltage; the second control circuit 112 is configured to provide a second liquid leakage detection voltage to the second sensing wire B of the corresponding liquid leakage sensing unit 13 in response to receiving a liquid leakage detection signal. The second liquid leakage detection voltage is less than the first liquid leakage detection voltage. And, in response to the on-off state between the first sensing wire A and the second sensing wire B being in the on state, the voltage of the first sensing wire A is pulled down to a third liquid leakage detection voltage. The third liquid leakage detection voltage is less than the preset reference voltage.

[0082] In some embodiments, in the open - circuit detection mode, the first control circuit 111 is further configured to provide a first open - circuit detection voltage to the first induction line A in response to receiving an open - circuit detection signal, where the first open - circuit detection voltage is less than a preset reference voltage; the second control circuit 112 is further configured to provide a second open - circuit detection voltage to the second induction line B in response to receiving the open - circuit detection signal, where the second open - circuit detection voltage is greater than the first open - circuit detection voltage, and in response to the on - off state between the first induction line A and the second induction line B being in the conducting state, raise the voltage of the first induction line A to a third open - circuit detection voltage, where the third open - circuit detection voltage is greater than the preset reference voltage.

[0083] It should be noted that the number of configured liquid leakage induction units 13 in the embodiments of the present application is not particularly limited. Correspondingly, the number of the first control circuits 111 is also not particularly limited. Figure 9 An example shows the case of multiple liquid leakage induction units 13 and multiple first control circuits 111. The embodiments of the present application include but are not limited to this case. For example, the embodiments of the present application may also include the case of setting one liquid leakage induction unit 13 and one first control circuit 111.

[0084] In some embodiments, as Figure 10 shown, the number of liquid leakage induction units 13 is multiple, and the second induction lines of the multiple liquid leakage induction units 13 are electrically connected and respectively connected to the second control circuit 112 of the polarity control unit 11.

[0085] Figure 11 The following shows a schematic structural diagram of a first control circuit provided by the embodiments of the present application. In some embodiments, as Figure 11 shown, the first control circuit 111 includes a first control transistor S A , a first resistor R a1 and a second resistor R a2 ; the control electrode of the first control transistor S A is connected to the control signal providing terminal CTL, and the control signal providing terminal CTL is configured to provide a liquid leakage detection signal or an open - circuit detection signal to the control electrode of the first control transistor S A ; the first pole of the first control transistor S A is connected to the first end of the first resistor R a1 , and the second pole of the first control transistor S A is grounded to GND; the second end of the first resistor R a1 is connected to the high - level voltage providing terminal VCC, and the high - level voltage providing terminal is used to provide a high - level voltage V cc , the first end of the second resistor R a2 is connected to the first pole of the first control transistor S A , and the first end of the second resistor R a2The second end is connected to the first induction wire A of the corresponding liquid leakage induction unit 13.

[0086] Figure 12 Fig. shows a schematic structural diagram of a second control circuit provided by an embodiment of the present application. In some embodiments, as Figure 12 shown, the second control circuit 112 includes a signal inverting unit N1, a second control transistor S B , a third resistor R b1 and a fourth resistor R b2 ; the input end of the signal inverting unit N1 is connected to the control signal providing end CTL, and the output end is connected to the control electrode of the second control transistor S B ; the control signal providing end CTL is configured to provide a liquid leakage detection signal or a wire break detection signal to the signal inverting unit N1, and the signal inverting unit N1 is configured to output an inverted signal of the liquid leakage detection signal or the wire break detection signal; the first pole of the second control transistor S B is connected to the first end of the third resistor R b1 , and the second pole of the second control transistor S B is grounded to GND; the second end of the third resistor R b1 is connected to the high-level voltage providing end VCC, and the high-level voltage providing end VCC is used to provide a high-level voltage V cc , the first end of the fourth resistor R b2 is connected to the first pole of the second control transistor S B , and the second end of the fourth resistor R b2 is connected to the second induction wire B of each liquid leakage induction unit 13.

[0087] Figure 13 Fig. shows a schematic implementation circuit structure diagram of a polarity control unit provided by an embodiment of the present application. In some embodiments, the number of liquid leakage induction units 13 is multiple. Correspondingly, the polarity control unit 11 includes a second control circuit 112 and multiple first control circuits 111. The first control circuits 111 are arranged in one-to-one correspondence with the liquid leakage induction units 13. The first control circuit 111 adopts the first control circuit as Figure 11 shown above, and the second control circuit 112 adopts the second control circuit as Figure 12 shown above. The specific circuit structures of the first control circuit 111 and the second control circuit 112 will not be specifically described in detail. Reference can be made to the first control circuit as Figure 11 shown above and the second control circuit as Figure 12 shown above; wherein, the control electrodes of the first control transistors S A of the multiple first control circuits 111 are electrically connected to the input end of the signal inverting unit N1 in the second control circuit 112 and are connected to the control signal providing end CTL; the output end of each first control circuit 111, that is, the second resistor R a2The second end is connected to the first induction wire A of the corresponding liquid leakage induction unit 13; the second induction wires B of multiple liquid leakage induction units 13 are electrically connected and connected to the output end of the second control circuit 112, that is, the fourth resistor R b2 The second end.

[0088] It should be noted that Figure 13 Only the case of setting 3 first control circuits 111 is exemplarily shown. The embodiments of the present application include but are not limited to this case. The number of first control circuits 111 can be correspondingly configured according to the number of liquid leakage induction units 13 configured as required. When the number of liquid leakage induction units 13 is 1, the number of first control circuits 111 is 1. When the number of liquid leakage induction units 13 is 2 or more, the number of first control circuits 111 is configured to be 2 or more.

[0089] In some embodiments, the first control transistor S in the first control circuit 111 A And the second control transistor S in the second control circuit 112 B Both use NPN-type triodes. Among them, the control pole of the first control transistor S A Or the second control transistor S B Is the base, the first pole is the collector, and the second pole is the emitter. The embodiments of the present application do not impose special restrictions on the transistor types of the first control transistor S A And the second control transistor S B Other types of transistors can also be used, such as PNP-type triodes, Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs), etc.

[0090] In some embodiments, in the second control circuit 112, the signal inversion unit N1 is implemented by an inverter. The embodiments of the present application do not impose special restrictions on the type of inverter used. For example, a CMOS inverter can be used, etc.

[0091] In some embodiments, the control signal providing end CTL is connected to an external circuit (such as a processing unit). The external circuit can provide a liquid leakage detection signal or a wire break detection signal to the control signal providing end CTL, and provide a liquid leakage detection signal or a wire break detection signal to the first control circuit 111 and the second control circuit 112 through the control signal providing end CTL to control the first control transistor S in the first control circuit 111 A And the second control transistor S in the second control circuit 112 BThe on-state. Among them, the liquid leakage detection signal is a low-level voltage signal, the wire break detection signal is a high-level voltage signal, or the liquid leakage detection signal is a high-level voltage signal and the wire break detection signal is a low-level voltage signal.

[0092] Taking the first control transistor S A and the second control transistor S B as an NPN-type triode as an example, the control signal providing end CTL currently provides a liquid leakage detection signal, and this liquid leakage detection signal is a low-level voltage signal. The first control transistor S A in the first control circuit 111 is cut off under the action of the liquid leakage detection signal. The signal inversion unit N1 in the second control circuit 112 outputs an inverted signal as a high-level voltage signal according to the input liquid leakage detection signal. The second control transistor S B is turned on under the action of the inverted signal output by the signal inversion unit N1; the control signal providing end CTL currently provides a wire break detection signal, and the wire break detection signal is a high-level voltage signal. The first control transistor S A in the first control circuit 111 is turned on under the action of the wire break detection signal. The signal inversion unit N1 in the second control circuit 112 outputs an inverted signal as a low-level voltage signal according to the input wire break detection signal. The second control transistor S B is cut off under the action of the inverted signal output by the signal inversion unit N1.

[0093] According to the circuit structure of the first control circuit 111 above, the on-state of the first control transistor S A can be controlled to control the voltage state output by the first control circuit 111, that is, to control the voltage provided to the first induction line A. When the first control transistor S A is cut off, the voltage output by the first control circuit 111 is a high-level voltage V CC ; when the first control transistor S A is turned on, the voltage output by the first control circuit 111 is a low-level voltage.

[0094] Similarly, according to the circuit structure of the second control circuit 112 above, the on-state of the second control transistor S B can be controlled to control the voltage state output by the second control circuit 112, that is, to control the voltage provided to the second induction line B. When the second control transistor S B is turned on, the voltage output by the second control circuit 112 is a low-level voltage; when the second control transistor S B is cut off, the voltage output by the second control circuit 112 is a high-level voltage V CC .

[0095] Combining the circuit structure of the above-mentioned first control circuit 111 and the circuit structure of the above-mentioned second control circuit 112, due to the voltage division effect of the first resistor R a1 , the second resistor R a2 , the third resistor R b1 , the fourth resistor R b2 , when in the liquid leakage detection mode or the disconnection detection mode, when the first induction line A and the second induction line B are in different on-off states, the voltage of the first induction line A will be adjusted to different voltage states. When the first induction line A and the second induction line B are in the off state, the voltage of the first induction line A will remain the voltage output by the first control circuit 111, and the voltage of the second induction line B will remain the voltage output by the second control circuit 112; when the first induction line A and the second induction line B are in the on state, the voltage of the first induction line A will be pulled up or pulled down due to the voltage division effect of the resistor.

[0096] Among them, the voltage of the first induction line A being pulled up or pulled down is related to the on-off states of the first control transistor S A and the second control transistor S B . When the second control transistor S A is on and the first control transistor S B is off, the voltage of the first induction line A will be pulled down; when the first control transistor S A is on and the second control transistor S B is off, the voltage of the first induction line A will be pulled up.

[0097] In some embodiments, in the first control circuit 111, the resistance values of the first resistor R a1 and the second resistor R a2 can be configured and adjusted according to the liquid leakage detection voltage / disconnection detection voltage that needs to be output actually. In the embodiments of the present application, there are no special restrictions on the type and resistance value of the first resistor R a1 and the second resistor R a2 . Similarly, in the second control circuit 112, the resistance values of the third resistor R b1 and the fourth resistor R b2 can be configured and adjusted according to the liquid leakage detection voltage / disconnection detection voltage that needs to be output actually. In the embodiments of the present application, there are no special restrictions on the type and resistance value of the third resistor R b1 and the fourth resistor R b2 either.

[0098] Figure 14 FIG. shows the structural schematic diagram of a threshold comparison unit provided by the embodiments of the present application. In some embodiments, such as Figure 14As shown, the threshold comparison unit 12 includes a reference voltage supply terminal Ref and at least one voltage comparison circuit 121, and the voltage comparison circuits 121 are configured in one-to-one correspondence with the liquid leakage sensing units 13.

[0099] Among them, the first input terminal of the voltage comparison circuit 121 is connected to the reference voltage supply terminal Ref, and the first input terminal is configured to receive a preset reference voltage V Ref provided by the reference voltage supply terminal Ref; the second input terminal of the voltage comparison circuit 121 is connected to the first induction line A of the corresponding liquid leakage sensing unit 13, and the second input terminal is configured to receive the voltage V A of the first induction line A of the corresponding liquid leakage sensing unit 13; the voltage comparison circuit 121 is configured to compare the voltage V A of the first induction line A with the preset reference voltage V Ref and output a liquid leakage detection result or a disconnection detection result through the corresponding output terminal Out according to the comparison result.

[0100] In some embodiments, through the voltage comparison circuit 121, the relative voltage magnitude relationship between the voltage V A of the first induction line A and the preset reference voltage V Ref can be determined to obtain a comparison result. The comparison result can be information indicating the relative voltage magnitude relationship between the voltage V A of the first induction line A and the preset reference voltage V Ref . According to the comparison result of the voltage V A of the first induction line A and the preset reference voltage V Ref , the relative voltage magnitude relationship between the voltage V A of the first induction line A and the preset reference voltage V Ref can be determined. Thus, according to the relative voltage magnitude relationship between the voltage V A of the first induction line A and the preset reference voltage V Ref , the on-off state between the first induction line A and the second induction line B can be determined, that is, it can be judged whether there is liquid leakage at the corresponding liquid leakage detection point to obtain a liquid leakage detection result, or it can be judged whether there is a disconnection between the first induction line A and the second induction line B to obtain a disconnection detection result.

[0101] In some embodiments, as Figure 14 shown, the number of the liquid leakage sensing units 13 is multiple. Correspondingly, the number of the voltage comparison circuits 121 in the threshold comparison unit 12 is configured to be multiple. Among them, the first input terminals of the multiple voltage comparison circuits 121 are all connected to the reference voltage supply terminal Ref, and the second input terminal of each voltage comparison circuit 121 is connected to the first induction line A of the correspondingly arranged liquid leakage sensing unit 13.

[0102] It should be noted thatFigure 14 Only the case where the threshold comparison unit 12 includes multiple voltage comparison circuits 121 is exemplarily shown. The embodiments of the present application include but are not limited to this case. The corresponding number of voltage comparison circuits 121 can be configured according to the number of actually configured liquid leakage sensing units 13. For example, if the number of liquid leakage sensing units 13 is 1, the number of voltage comparison circuits 121 in the threshold comparison unit 12 is 1.

[0103] Figure 15 The following shows a schematic circuit structure diagram of an implementation of a threshold comparison unit provided by an embodiment of the present application. In some embodiments, as Figure 15 shown, in the threshold comparison unit 12, the reference voltage providing terminal Ref includes a first reference resistor R x and a second reference resistor R y , the first end of the first reference resistor R x is connected to the high-level voltage providing terminal VCC, and the high-level voltage providing terminal VCC is used to provide a high-level voltage V CC , the second end of the first reference resistor R x is connected to the first end of the second reference resistor R y , and the second end of the second reference resistor R y is grounded to GND.

[0104] Wherein, the connection point between the first reference resistor R x and the second reference resistor R y , that is, the second end of the first reference resistor R x or the first end of the second reference resistor R y , is connected to the first input terminal of each voltage comparison circuit 121. The high-level voltage provided by the high-level voltage providing terminal VCC, through the voltage division of the first reference resistor R x and the second reference resistor R y , at the connection point between the first reference resistor R x and the second reference resistor R y , that is, the second end of the first reference resistor R x or the first end of the second reference resistor R y , generates a preset reference voltage V Ref , and provides the preset reference voltage V Ref to the first input terminal of each voltage comparison circuit 121. Among them, the magnitude of the preset reference voltage V Ref is related to the resistance values of the first reference resistor R x and the second reference resistor R y and the high-level voltage V CC , V Ref =V CC *R y / R x, in the embodiments of the present application, a preset reference voltage V can be provided according to actual needs Ref Configure the first reference resistor R x and the second reference resistor R y resistance values.

[0105] As Figure 15 shown, in the threshold comparison unit 12, each voltage comparison circuit 121 includes a voltage comparator 1211. The negative pole of the voltage comparator 1211 is the first input terminal, and the negative pole of the voltage comparator 1211 is connected to the reference voltage supply terminal Ref. The positive pole of the voltage comparator 1211 is the second input terminal, and the positive pole of the voltage comparator 1211 is connected to the first induction line A of the corresponding liquid leakage induction unit 13. Each voltage comparator 1211 outputs the corresponding liquid leakage detection result or disconnection detection result through the corresponding output terminal according to the comparison result of the voltage of the corresponding connected first induction line A and the preset reference voltage.

[0106] For example, as Figure 15 shown, n (n is greater than or equal to 1) liquid leakage induction units 13 are configured. Correspondingly, n voltage comparators 1211 are configured in the threshold comparison unit 12. Among them, the first induction line A of the first liquid leakage induction unit 13 is connected to the second input terminal of the first voltage comparator 1211, and the voltage of the first induction line A of the first liquid leakage induction unit 13 is denoted as V A1 , the liquid leakage detection result / disconnection detection result output by the output terminal Out1 of the first voltage comparator 1211 is denoted as WD1; the first induction line A of the second liquid leakage induction unit 13 is connected to the second input terminal of the second voltage comparator 1211, and the voltage of the first induction line A of the second liquid leakage induction unit 13 is denoted as V A2 , the liquid leakage detection result / disconnection detection result output by the output terminal Out2 of the second voltage comparator 1211 is denoted as WD2; the first induction line A of the third liquid leakage induction unit 13 is connected to the second input terminal of the third voltage comparator 1211, and the voltage of the first induction line A of the third liquid leakage induction unit 13 is denoted as V A3 , the liquid leakage detection result / disconnection detection result output by the output terminal Out3 of the third voltage comparator 1211 is denoted as WD3; and so on. The first induction line A of the nth liquid leakage induction unit 13 is connected to the second input terminal of the nth voltage comparator 1211, and the voltage of the first induction line A of the nth liquid leakage induction unit 13 is denoted as V An , the liquid leakage detection result / disconnection detection result output by the output terminal Outn of the nth voltage comparator 1211 is denoted as WD n .

[0107] In some embodiments, the output terminal of each voltage comparator 1211 is correspondingly connected to a pull-up resistor, and the liquid leakage detection result / disconnection detection result output from the output terminal of each voltage comparator 1211 is transmitted to an external circuit (such as a processing unit) through the corresponding pull-up resistor.

[0108] For example, as Figure 15 shown, the output terminal Out1 of the first voltage comparator 1211 is connected to one end of the pull-up resistor R1, and the other end of the pull-up resistor R1 is connected to an external circuit (not shown in the figure); the output terminal Out2 of the second voltage comparator 1211 is connected to one end of the pull-up resistor R2, and the other end of the pull-up resistor R2 is connected to an external circuit; the output terminal Out3 of the third voltage comparator 1211 is connected to one end of the pull-up resistor R3, and the other end of the pull-up resistor R3 is connected to an external circuit; and so on, the output terminal Outn of the nth voltage comparator 1211 is connected to one end of the pull-up resistor R n and the other end of the pull-up resistor R n is connected to an external circuit.

[0109] Figure 16 Fig. shows a schematic structural diagram of another liquid leakage detection circuit provided by an embodiment of the present application. In some embodiments, as Figure 16 shown, the liquid leakage detection circuit 10 further includes a processing unit 15, the above external circuit is the processing unit 15, and the polarity control unit 11 and the threshold comparison unit 12 are respectively connected to the processing unit 15.

[0110] Among them, the processing unit 15 is configured to provide a liquid leakage detection signal or a disconnection detection signal to the polarity control unit 11, and read the liquid leakage detection result or the disconnection detection result output by the threshold comparison unit 12.

[0111] In some embodiments, the processing unit 15 may include a microcontroller unit (MCU). The specific implementation form of the processing unit 15 in the embodiments of the present application is not particularly limited, and other methods may also be used to implement the configuration of the processing unit 15.

[0112] In some embodiments, the polarity control unit 11 includes at least one of the above first control circuits and the above second control circuits. The control signal providing end in the first control circuit and the control signal providing end in the second control circuit are connected to the processing unit 15 to receive the liquid leakage detection signal or the disconnection detection signal provided by the processing unit 15, and provide the liquid leakage detection signal or the disconnection detection signal to the first control circuit and the second control circuit.

[0113] In some embodiments, the threshold comparison unit 12 includes at least one of the above voltage comparison circuits 121, wherein the output terminal corresponding to each voltage comparison circuit 121 is connected to the processing unit 15, and the processing unit 15 is configured to read the liquid leakage detection result or the disconnection detection result output by the output terminal corresponding to each voltage comparison circuit.

[0114] Figure 17 FIG. shows a schematic structural diagram of another liquid leakage detection circuit provided by an embodiment of the present application. In some embodiments, as Figure 17 shown, the liquid leakage detection circuit 10 further includes an interface expansion unit 16, and the threshold comparison unit 12 is connected to the processing unit 15 through the interface expansion unit 16.

[0115] Figure 18 FIG. shows a schematic connection relationship diagram among the processing unit, the interface expansion unit, and the threshold comparison unit in an embodiment of the present application. In some embodiments, as Figure 18 shown, the processing unit 15 is connected to the interface expansion unit 16 through a bus L. The interface expansion unit 16 includes preset input / output interfaces (not shown in the figure) configured in one-to-one correspondence with the voltage comparison circuits 121 in the threshold comparison unit 12, and the output terminal of each voltage comparison circuit 121 is connected to the corresponding preset input / output interface in the interface expansion unit 16.

[0116] In some embodiments, in the interface expansion unit 16, each preset input / output interface may be an input / output interface (Input / Output, I / O), such as a general-purpose input / output interface (General-purpose Input / Output, GPIO).

[0117] In some embodiments, the bus L may be an I2C (Inter-Integrated Circuit) bus or other communication buses. As Figure 18 shown, taking the bus L as an I2C bus as an example, the bus L includes a serial clock line (Serial Clock Line, SCL), a serial data signal line (Serial Data, SDA), a power supply VCC, and two pull-up resistors R. The serial clock line SCL is connected to one end of a pull-up resistor R, and the other end of this pull-up resistor R is connected to the power supply VCC. The serial data signal line SDA is connected to one end of the other pull-up resistor R, and the other end of this other pull-up resistor R is connected to the power supply VCC.

[0118] In some embodiments, the interface expansion unit 16 may communicate with the processing unit 15 through the bus L interface. The processing unit 15 serves as the master device of the bus L, and the interface expansion unit 16 serves as the slave device of the bus L. The interface expansion unit 16 may be assigned a fixed device address.

[0119] In some embodiments, the processing unit 15 may initiate reading the level values of all preset input / output interfaces in the interface expansion unit 16 during multiple bus data read cycles, so as to read the liquid leakage detection result or disconnection detection result (WD1 to WD) output by the output end corresponding to each voltage comparison circuit 121 in the threshold comparison unit 12 through the preset input / output interfaces of the interface expansion unit 16 n )

[0120] In some embodiments, the processing unit 15 has a bus data register, and this bus data register can be used to store the liquid leakage detection result or disconnection detection result (WD1 to WD) output by each voltage comparison circuit 121 in the threshold comparison unit 12 n )

[0121] Among them, the bus data register can respectively store the liquid leakage detection results or disconnection detection results output by n voltage comparison circuits 121 through n storage units (bit0 to bit n-1 ). Each storage unit corresponds to a bit, and each storage unit stores a liquid leakage detection result or disconnection detection result output by a voltage comparison circuit 121. That is, each storage unit corresponds to the liquid leakage detection result of a liquid leakage detection point or the disconnection detection result of a liquid leakage induction unit. The processing unit 15 can determine the liquid leakage detection point with liquid leakage or the liquid leakage induction unit with disconnection according to the values stored in each storage unit in the bus data register

[0122] In some embodiments, after the processing unit 15 reads the liquid leakage detection result or disconnection detection result (WD1 to WD) output by each voltage comparison circuit 121 corresponding in the threshold comparison unit 12 through the interface expansion unit 16 n ) n ), it can respectively store the liquid leakage detection results or disconnection detection results (WD1 to WD) corresponding to each voltage comparison circuit 121 into the corresponding storage units in the bus data register

[0123] In some embodiments, in the liquid leakage detection mode, the liquid leakage detection result output by the voltage comparison circuit 121 is information indicating whether there is liquid leakage. For example, it is represented by "0" and "1". "1" represents a high level and there is no liquid leakage, and "0" represents a low level and there is liquid leakage. Similarly, in the disconnection detection mode, the disconnection detection result output by the voltage comparison circuit 121 is information indicating whether there is a disconnection. For example, it is represented by "0" and "1". "1" represents a high level and there is no disconnection, and "0" represents a low level and there is a disconnection

[0124] In some embodiments, the processing unit 15 may be connected to the polarity control unit 11 through an I / O interface, and output an I / O signal to the polarity control unit 11 through this I / O interface as a liquid leakage detection signal or a wire break detection signal, so as to control the on-state of the control transistor in the control circuit of the polarity control unit 11.

[0125] In some embodiments, the processing unit 15 has a polarity control register, which can be used to control the output of the liquid leakage detection signal or the wire break detection signal to the polarity control unit 11, and the detection mode can be switched by setting the value of the polarity control register. For example, when the polarity control register is set to 1, the processing unit 15 outputs a wire break detection signal to the polarity control unit 11, and when the polarity control register is set to 0, the processing unit 15 outputs a liquid leakage detection signal to the polarity control unit 11.

[0126] In an actual application scenario, in the above liquid leakage detection circuit, the polarity control unit 11, the threshold comparison unit 12, the processing unit 15, and the interface expansion unit 16 can all be integrated on the same motherboard (main board). The motherboard has a plurality of connectors, and each connector has a first pin and a second pin. On the motherboard, the first pins are respectively connected to the output ends of the first control circuit 111 in the polarity control unit 11 in a one-to-one correspondence, and the first pins are used to connect the first induction line A of the corresponding liquid leakage induction unit 13. The second pins of the plurality of connectors are respectively connected to the output ends of the second control circuit 112 in the polarity control unit 11, and the second pins are used to connect the second induction line B of the corresponding liquid leakage induction unit 13.

[0127] In the above liquid leakage detection circuit, one or more liquid leakage induction units 13 are respectively arranged at each liquid leakage detection point that needs to be detected for liquid leakage. The first induction line A of each liquid leakage induction unit 13 is connected to the corresponding first pin on the above motherboard through a connector, and the second induction line B of each liquid leakage induction unit 13 is connected to the corresponding second pin on the above motherboard through a connector.

[0128] Figure 19 The figure shows a schematic diagram of the detection scenario of a liquid leakage detection circuit according to an embodiment of the present application. In some detection scenarios, the liquid leakage detection circuit according to an embodiment of the present application can be applied to an indirect cold plate liquid cooling system of a chip to detect the liquid leakage situation on the cold plate of the chip, such as Figure 19As shown, there are 6 liquid leakage detection points on the cold plates of two chips (Chip 1 and Chip 2), namely Liquid Leakage Detection Point 1, Liquid Leakage Detection Point 2, Liquid Leakage Detection Point 3, Liquid Leakage Detection Point 4, Liquid Leakage Detection Point 5, and Liquid Leakage Detection Point 6. The positions of the liquid leakage detection points can be at the connection points between the cold plate and the catheter, the liquid guiding groove openings, and other places where liquid is likely to leak. Among them, Liquid Leakage Detection Points 1, 3, 4, and 5 are at the connection points between the cold plate and the catheter, and Liquid Leakage Detection Points 2 and 6 are at the liquid guiding groove openings.

[0129] Liquid leakage induction units (not shown in the figure) are respectively provided corresponding to each of Liquid Leakage Detection Point 1, Liquid Leakage Detection Point 2, Liquid Leakage Detection Point 3, Liquid Leakage Detection Point 4, Liquid Leakage Detection Point 5, and Liquid Leakage Detection Point 6. The first induction lines of the liquid leakage induction units at each liquid leakage detection point are respectively connected to the first pins of the corresponding connectors on the motherboard, and the second induction lines of the liquid leakage induction units at each liquid leakage detection point are respectively connected to the second pins of the corresponding connectors on the motherboard.

[0130] For example, as Figure 19 shown, there are 6 connectors on the motherboard, namely Connector 1, 2, 3, 4, 5, and 6. The first induction lines of the liquid leakage induction units at Liquid Leakage Detection Point 1, Liquid Leakage Detection Point 2, and Liquid Leakage Detection Point 3 are respectively connected to the first pins of Connectors 1, 2, and 3, and the second induction lines are respectively connected to the second pins of Connectors 1, 2, and 3; the first induction lines of the liquid leakage induction units at Liquid Leakage Detection Point 4, Liquid Leakage Detection Point 5, and Liquid Leakage Detection Point 6 are respectively connected to the first pins of Connectors 4, 5, and 6, and the second induction lines are respectively connected to the second pins of Connectors 4, 5, and 6.

[0131] It should be noted that the application scenarios of the liquid leakage detection circuit in the embodiments of the present application include, but are not limited to, the indirect cold plate type liquid cooling heat dissipation system of the above chips, and can also be applicable to any scenario where liquid leakage detection is required.

[0132] Next, taking Figure 9 、 Figure 13 、 Figure 15 、 Figure 17 、 Figure 18 as examples, the liquid leakage detection principle and the disconnection detection principle of the liquid leakage detection circuit in the embodiments of the present application are described. Among them, in the polarity control unit 11, the first control transistors S A in each first control circuit 111 and the second control transistors S B in the second control circuit 112 are all NPN-type triodes, having the characteristics of conducting when at a high level and cutting off when at a low level.

[0133] Taking the liquid leakage detection signal as a low-level voltage signal and the disconnection detection signal as a high-level voltage signal as an example, when the processing unit 15 provides the liquid leakage detection signal to the control signal supply terminal CTL of the first control circuit 111, the system enters the liquid leakage detection mode. In the polarity control unit 11, in each first control circuit 111, the first control transistor S A is turned off under the action of the liquid leakage detection signal, and the output terminals of the first control circuits 111 respectively output a high-level voltage V CC to the first induction line A of each liquid leakage induction unit 13. At this time, the liquid leakage detection voltage V A of each first induction line A CC = V

[0134] Meanwhile, in the second control circuit 112, the signal inversion unit N1 generates an inverted signal according to the input liquid leakage detection signal. The inverted signal is a high-level voltage signal, and the second control transistor S B is turned on under the action of the inverted signal, and the voltage at the output terminal of the second control circuit 112 is pulled down to a low-level voltage. The output terminal of the second control circuit 112 is connected to the second induction line B of each liquid leakage induction unit 13, and the voltage of the second induction line B of each liquid leakage induction unit 13 is set to a low-level voltage. At this time, the liquid leakage detection voltage V B of each second induction line B

[0135] = 0. B At this time, since the voltage V A of the second induction line B CC = 0, and the voltage V B of the first induction line A A = V B - V A is not greater than the conduction voltage (such as 0.7V) of the PN junction device 1411 in the one-way conductor 141, the PN junction devices 1411 of each one-way conductor 141 are all in the cut-off state.

[0136] Taking any one liquid leakage induction unit 13 as an example, in this liquid leakage induction unit 13, when the corresponding liquid leakage detection point is in a non-liquid leakage state, the conductive polymer layer 1311 is non-conductive, making the first induction line A and the second induction line B in a disconnected state. The voltage of the first induction line A remains V A = V CC , V B = 0, V A is greater than V B , and V A is greater than the preset reference voltage V Ref . Among them, the first reference resistor R xand the second reference resistor R y so that the output preset reference voltage V Ref satisfies V Ref is less than V CC .

[0137] When the corresponding liquid leakage detection point is in a liquid leakage state, the conductive polymer layer 1311 is low-resistance conductive when encountering water, so that the first induction line A and the second induction line B are in a conductive state, that is, the output end of the first control circuit 111 is connected to the output end of the second control circuit 112. Among the first resistor R a1 , the second resistor R a2 and the fourth resistor R b2 , the voltage of the first induction line A is pulled down. According to the principle of resistor voltage division, at this time, the voltage V A of the first induction line A = V B = V CC * R b2 / (R a1 + R a2 + R b2 ), and V A = V CC * R b2 / (R a1 + R a2 + R b2 ) is less than the preset reference voltage V Ref . Among them, the resistance values of the first resistor R a1 , the second resistor R a2 , the fourth resistor R b2 , the first reference resistor R x and the second reference resistor R y can be pre-configured so that the preset reference voltage V Ref satisfies V Ref is greater than V CC * R b2 / (R a1 + R a2 + R b2 ), and V Ref is less than V CC .

[0138] According to the above analysis, in the liquid leakage detection mode, when the first induction line A and the second induction line B are in different on-off states, the relative voltage magnitude relationship between the voltage V A of the first induction line A and the preset reference voltage V Ref is different. When the first induction line A and the second induction line B are in a conductive state, the voltage V A of the first induction line A and the preset reference voltage V Ref satisfy V A is less than VRef Regarding the relative voltage magnitude relationship, when it is in the cut-off state between the first induction line A and the second induction line B, the voltage V of the first induction line A A and the preset reference voltage V Ref satisfy V A is greater than V Ref in the relative voltage magnitude relationship.

[0139] At this time, through the voltage comparison circuit 121 of the threshold comparison unit 12, according to the voltage V of the first induction line A A and the preset reference voltage V Ref in the comparison result, that is, the relative voltage magnitude relationship, the on-off state (conducting or disconnecting state) between the first induction line A and the second induction line B can be judged, so as to determine whether there is a liquid leakage situation at the liquid leakage detection point corresponding to the liquid leakage induction unit 13, and the liquid leakage detection result corresponding to this comparison result is output through the output terminal of the voltage comparison circuit 121. This liquid leakage detection result is output through the output terminal and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor.

[0140] For example, as Figure 15 shown, the voltage comparator 1211 in the voltage comparison circuit 121 compares the voltage V of the first induction line A1 A1 with the preset reference voltage V Ref . If the comparison result is that the voltage V of the first induction line A1 A1 is greater than the preset reference voltage V Ref , a high-level liquid leakage detection result WD1 is generated, indicating that there is no liquid leakage at the corresponding liquid leakage detection point. This liquid leakage detection result WD1 is output through the output terminal Out1 and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor R1; if the comparison result is that the voltage V of the first induction line A1 A1 is less than the preset reference voltage V Ref , a low-level liquid leakage detection result WD1 is generated, indicating that there is liquid leakage at the corresponding liquid leakage detection point. This liquid leakage detection result WD1 is output through the output terminal Out1 and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor R1.

[0141] When the processing unit 15 provides a disconnection detection signal to the control signal supply terminal CTL of the first control circuit 111, the system enters the disconnection detection mode. In the polarity control unit 11, in each first control circuit 111, the first control transistor S AUnder the action of the disconnection detection signal, it conducts, and the output terminals of the first control circuits 111 are pulled down to a low-level voltage. The output terminals of the first control circuits 111 are respectively connected to the first induction lines A of the corresponding liquid leakage induction units 13, and the first induction lines A of the liquid leakage induction units 13 are set to a low-level voltage. At this time, the disconnection detection voltage V of each first induction line A A = 0.

[0142] Meanwhile, in the second control circuit 112, the signal inversion unit N1 generates an inverted signal according to the input disconnection detection signal, and the inverted signal is a low-level voltage signal. The second control transistor S B is cut off under the action of the inverted signal, and the voltage at the output terminal of the second control circuit 112 is set to a high-level voltage. The output terminal of the second control circuit 112 is connected to the second induction lines B of the liquid leakage induction units 13, and the voltages of the second induction lines B of the liquid leakage induction units 13 are set to high-level voltages. At this time, the disconnection detection voltage V of each second induction line B B = V CC .

[0143] At this time, since the voltage V of the second induction line B B = V CC , the voltage V of the first induction line A A = 0, V CC is greater than 0, and the voltage V of the second induction line B B and the voltage V of the first induction line A A satisfy the conduction condition of the PN junction device 1411 in the one-way conductor 141: V B - V A is greater than the conduction voltage of the PN junction device 1411 (such as 0.7V), and the PN junction devices 1411 of each one-way conductor 141 are all in the conduction state.

[0144] Taking the one-way conductor 141 corresponding to any liquid leakage induction unit 13 as an example, when the one-way conductor 141 is in the conduction state, when there is a disconnection in the first induction line A or the second induction line B, the first induction line A and the second induction line B will be in a disconnected state, and the voltage of the first induction line A remains V A = 0, V B = V CC , V A is less than V B , and V A is less than the preset reference voltage V Ref . Among them, the resistance values of the first reference resistor R x and the second reference resistor R y in the reference voltage supply terminal Ref can be pre-configured so that the output preset reference voltage V Ref satisfies V Ref is greater than 0.

[0145] When there is no open circuit in both the first induction wire A and the second induction wire B, since the unidirectional conductor 141 is in a conducting state, the first induction wire A and the second induction wire B are in a conducting state, that is, the output end of the first control circuit 111 is connected to the output end of the second control circuit 112. At the second resistor R a2 , the third resistor R b1 , the fourth resistor R b2 , the voltage of the first induction wire A is pulled up. According to the principle of resistor voltage division, at this time, the voltage of the first induction wire A is pulled up to V A = V B = (V CC - the conduction voltage of the unidirectional conductor 141) * R a2 / (R b1 + R b2 + R a2 ), and V A = (V CC - the conduction voltage of the unidirectional conductor 141) * R a2 / (R b1 + R b2 + R a2 ) is greater than the preset reference voltage V Ref . Among them, the resistance values of the first resistor R a1 , the second resistor R a2 , the third resistor R b1 , the fourth resistor R b2 , the first reference resistor R x and the second reference resistor R y can be pre-configured so that the preset reference voltage V Ref satisfies V Ref is less than (V CC - the conduction voltage of the unidirectional conductor 141) * R a2 / (R b1 + R b2 + R a2 ), and V Ref is less than V CC .

[0146] According to the above analysis, in the open circuit detection mode, when the first induction wire A and the second induction wire B are in different on-off states, the relative voltage magnitude relationship between the voltage V A of the first induction wire A and the preset reference voltage V Ref is different. When there is no open circuit and the first induction wire A and the second induction wire B are in a conducting state, the voltage V A of the first induction wire A and the preset reference voltage V Ref satisfy V A is greater than VRef Regarding the relative voltage magnitude relationship, when there is a wire break and the first induction wire A and the second induction wire B are in a cut-off state, the voltage V of the first induction wire A A and the preset reference voltage V Ref satisfy V A is less than V Ref for the relative voltage magnitude relationship.

[0147] At this time, through the voltage comparison circuit 121 of the threshold comparison unit 12, according to the voltage V of the first induction wire A A and the comparison result with the preset reference voltage V Ref , that is, the relative voltage magnitude relationship, the on-off state (conducting or disconnecting state) between the first induction wire A and the second induction wire B can be determined, so as to determine whether there is a wire break in the first induction wire A and the second induction wire B of the liquid leakage induction unit 13, and the wire break detection result corresponding to this comparison result is output through the output terminal of the voltage comparison circuit 121, and this wire break detection result is output through the output terminal and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor.

[0148] For example, as Figure 15 shown, the voltage comparator 1211 in the voltage comparison circuit 121 compares the voltage V of the first induction wire A1 A1 with the preset reference voltage V Ref . If the comparison result is that the voltage V of the first induction wire A1 A1 is greater than the preset reference voltage V Ref , then the wire break detection result WD1 is generated as a high level, indicating that there is no wire break in the first induction wire A and the second induction wire B. This wire break detection result WD1 is output through the output terminal Out1 and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor R1; if the comparison result is that the voltage V of the first induction wire A1 A1 is less than the preset reference voltage V Ref , then the wire break detection result WD1 is generated as a low level, indicating that there is a wire break in the first induction wire A or the second induction wire B. This wire break detection result WD1 is output through the output terminal Out1 and transmitted to the corresponding preset input / output interface connected in the interface expansion unit 16 via the pull-up resistor R1.

[0149] The processing unit 15 can obtain the level states of each preset input / output interface in the interface expansion unit 16 during a bus data read cycle. The level states of each preset input / output interface are respectively used to represent the liquid leakage detection result / wire break detection result output by the voltage comparison circuit 121. Among them, the level states of the preset input / output interfaces can be represented by "0" and "1". "0" represents a low level state, and "1" represents a high level state. When the level state of the preset input / output interface in the interface expansion unit 16 is "1", it indicates that the liquid leakage detection result output by the corresponding voltage comparison circuit 121 is that there is no liquid leakage or the wire break detection result is that there is no wire break. When the level state of the preset input / output interface in the interface expansion unit 16 is "0", it indicates that the liquid leakage detection result output by the corresponding voltage comparison circuit 121 is that there is liquid leakage or the wire break detection result is that there is a wire break.

[0150] The processing unit 15 can store the level states of each preset input / output interface in the interface expansion unit 16 read through the bus L into each storage unit bit0 - bit of the bus data register. n-1 Each storage unit bit0 - bit n-1 respectively corresponds to storing the liquid leakage detection result or wire break detection result WD1 - WD output by each voltage comparison circuit 121 in the threshold comparison unit 12. n The value stored in each storage unit can be 0 or 1. "0" indicates that the corresponding liquid leakage detection result / wire break detection result is in a low level state, that is, there is liquid leakage or there is a wire break. "1" indicates that the corresponding liquid leakage detection result / wire break detection result is in a high level state, that is, there is no liquid leakage or there is no wire break.

[0151] In actual application operations, the wire break detection can be completed first through the above - mentioned wire break detection process. That is, the processing unit 15 first sets the value of the polarity control register to 1, provides a wire break detection signal to the polarity control unit 11, so that the liquid leakage detection circuit enters the wire break detection mode and completes the wire break detection, obtaining the wire break detection results of each liquid leakage induction unit 13. The wire break detection results of each liquid leakage induction unit 13 are read into each storage unit bit0 to bit of the bus data register for storage. n-1 If the wire break detection results stored in each storage unit bit0 to bit n-1 are all "1", it indicates that there is no wire break in each liquid leakage induction unit 13. Otherwise, it is determined that the liquid leakage induction unit 13 corresponding to the wire break detection result of "0" has a wire break.

[0152] Then, when there is no disconnection in each leakage sensing unit 13, the processing unit 15 sets the value of the polarity control register to 0, and provides a leakage detection signal to the polarity control unit 11, so that the leakage detection circuit enters the leakage detection mode and completes the leakage detection, and obtains the leakage detection result of each leakage sensing unit 13. The leakage detection result of each leakage sensing unit 13 is read into each storage unit bit0 to bit1 in the bus data register. n-1 Storage, if each storage unit bit0 to bit n-1 If all the stored leakage detection results are "1", it means that there is no leakage at the leakage detection points corresponding to the leakage sensing units 13. Otherwise, it is determined that there is leakage at the leakage detection points corresponding to the leakage sensing units 13 whose corresponding leakage detection results are "0".

[0153] In the embodiment of the present application, the leakage detection circuit can expand the leakage detection channel according to the location and number of leakage detection points that need to be detected, configure the corresponding number of leakage sensing units, and configure the corresponding polarity control unit, threshold comparison unit, interface expansion unit and processing unit. The circuit can have both leakage detection and disconnection detection functions, and the detection channel is flexible and expandable and can effectively locate the leakage point. Among them, the leakage sensing unit is easy to assemble and can be directly pasted on the leakage detection point. The processing unit can poll the status of each detection point in real time, which is conducive to quickly locating the leakage and disconnection point, and the detection point can be flexibly expanded. The detection sensitivity can be flexibly adjusted through the voltage divider resistor in the polarity control unit, which effectively improves the reliability of the system. The leakage detection circuit device of the embodiment of the present application is low in cost, and the processing unit controls the polarity control unit by digital control, which can effectively ensure the reliability of the detection information and the robustness of the control.

[0154] By way of exemplary and non-limiting examples, a detailed description of exemplary embodiments of the present application has been provided above. However, various modifications and adjustments to the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and claims, but will not depart from the scope of the present application. Therefore, the proper scope of the present application will be determined according to the claims.

Claims

1. A liquid leakage detection circuit, comprising: A polarity control unit, a threshold comparison unit, and at least one liquid leakage sensing unit. Each of the liquid leakage sensing units is correspondingly arranged with a liquid leakage detection point. The liquid leakage sensing unit has a first sensing wire and a second sensing wire. The first sensing wire and the second sensing wire are respectively connected to the polarity control unit. The threshold comparison unit is connected to the first sensing wire; The liquid leakage sensing unit is configured to control the on-off state between the first sensing wire and the second sensing wire according to the liquid leakage state of the corresponding liquid leakage detection point; The polarity control unit is configured to, in response to receiving a liquid leakage detection signal, respectively provide corresponding liquid leakage detection voltages to the first sensing wire and the second sensing wire, and adjust the relative voltage magnitude relationship between the liquid leakage detection voltage of the first sensing wire and a preset reference voltage according to the on-off state between the first sensing wire and the second sensing wire; The threshold comparison unit is configured to output a liquid leakage detection result according to the comparison result between the liquid leakage detection voltage of the first sensing wire and the preset reference voltage.

2. The liquid leakage detection circuit according to claim 1, wherein, The liquid leakage sensing unit further includes a liquid leakage sensing body. The first sensing wire and the second sensing wire are respectively connected to two ends of the liquid leakage sensing body; The liquid leakage sensing body is configured to conduct electricity in response to liquid leakage occurring at the corresponding liquid leakage detection point, so as to control the first sensing wire and the second sensing wire to be conducted.

3. The liquid leakage detection circuit according to claim 1, further includes a disconnection detection control unit. The first sensing wire and the second sensing wire are also respectively connected to the disconnection detection control unit; The disconnection detection control unit is configured to control the on-off state between the first sensing wire and the second sensing wire according to the voltage of the first sensing wire and the voltage of the second sensing wire; The polarity control unit is further configured to, in response to receiving a disconnection detection signal, respectively provide corresponding disconnection detection voltages to the first sensing wire and the second sensing wire, and adjust the relative voltage magnitude relationship between the disconnection detection voltage of the first sensing wire and a preset reference voltage according to the on-off state between the first sensing wire and the second sensing wire; The threshold comparison unit is further configured to output a disconnection detection result according to the comparison result between the disconnection detection voltage of the first sensing wire and the preset reference voltage.

4. The liquid leakage detection circuit according to claim 3, wherein, The disconnection detection control unit includes a unidirectional conductor. The first sensing wire and the second sensing wire are respectively connected to two ends of the unidirectional conductor; The unidirectional conductor is configured to conduct electricity in response to the voltages of the first sensing wire and the second sensing wire satisfying a preset condition, so as to control the first sensing wire and the second sensing wire to be conducted.

5. The liquid leakage detection circuit according to claim 2, wherein, The liquid leakage sensing body includes a conductive polymer layer and an adhesive layer. The adhesive layer is pasted on the liquid leakage detection point; The first sensing wire and the second sensing wire are respectively connected to two ends of the conductive polymer layer.

6. The liquid leakage detection circuit according to claim 4, wherein, The unidirectional conductor includes a PN junction device. The PN junction device has a P-type region and an N-type region. The first sensing wire is connected to the N-type region, and the second sensing wire is connected to the P-type region.

7. The liquid leakage detection circuit according to claim 1, wherein, The polarity control unit includes at least one first control circuit and a second control circuit; the first control circuits are configured in one-to-one correspondence with the liquid leakage sensing units, a first sensing line of the liquid leakage sensing unit is connected to the corresponding first control circuit, and second sensing lines of the at least one liquid leakage sensing unit are connected to the second control circuit; The first control circuit is configured to, in response to receiving a liquid leakage detection signal, provide a first liquid leakage detection voltage to the first sensing line of the corresponding liquid leakage sensing unit, and the first liquid leakage detection voltage is greater than the preset reference voltage; The second control circuit is configured to, in response to receiving a liquid leakage detection signal, provide a second liquid leakage detection voltage to the second sensing line of the corresponding liquid leakage sensing unit, the second liquid leakage detection voltage is less than the first liquid leakage detection voltage, and, in response to the on-off state between the first sensing line and the second sensing line being an on state, pull down the voltage of the first sensing line to a third liquid leakage detection voltage, and the third liquid leakage detection voltage is less than the preset reference voltage.

8. The liquid leakage detection circuit according to claim 7 further includes a breakage detection control unit, and the first sensing line and the second sensing line are also respectively connected to the breakage detection control unit; The breakage detection control unit is configured to control the on-off state between the first sensing line and the second sensing line according to the voltage of the first sensing line and the voltage of the second sensing line; The first control circuit is further configured to, in response to receiving a breakage detection signal, provide a first breakage detection voltage to the first sensing line, and the first breakage detection voltage is less than the preset reference voltage; The second control circuit is further configured to, in response to receiving the breakage detection signal, provide a second breakage detection voltage to the second sensing line, the second breakage detection voltage is greater than the first breakage detection voltage, and in response to the on-off state between the first sensing line and the second sensing line being an on state, pull up the voltage of the first sensing line to a third breakage detection voltage, and the third breakage detection voltage is greater than the preset reference voltage.

9. The liquid leakage detection circuit according to claim 8, wherein, The first control circuit includes a first control transistor, a first resistor, and a second resistor; A control electrode of the first control transistor is connected to a control signal providing end, and the control signal providing end is configured to provide the liquid leakage detection signal or the breakage detection signal to the control electrode of the first control transistor; A first pole of the first control transistor is connected to a first end of the first resistor, and a second pole of the first control transistor is grounded; a second end of the first resistor is connected to a high-level voltage providing end, a first end of the second resistor is connected to the first pole of the first control transistor, and a second end of the second resistor is connected to the first sensing line.

10. The liquid leakage detection circuit according to claim 8, wherein, The second control circuit includes a signal inversion unit, a second control transistor, a third resistor, and a fourth resistor; The input end of the signal inversion unit is connected to the control signal providing end, and the output end is connected to the control electrode of the second control transistor. The control signal providing end is configured to provide the liquid leakage detection signal or the wire break detection signal to the signal inversion unit, and the signal inversion unit is configured to output an inverted signal of the liquid leakage detection signal or the wire break detection signal; The first pole of the second control transistor is connected to the first end of the third resistor, and the second pole of the second control transistor is grounded; the second end of the third resistor is connected to the high-level voltage providing end, the first end of the fourth resistor is connected to the first pole of the second control transistor, and the second end of the fourth resistor is connected to the second induction line.

11. The liquid leakage detection circuit according to claim 1 or 3, wherein, The threshold comparison unit includes a reference voltage providing end and at least one voltage comparison circuit, and the voltage comparison circuits are configured in one-to-one correspondence with the liquid leakage induction units; The first input end of the voltage comparison circuit is connected to the reference voltage providing end, and the first input end is configured to receive the preset reference voltage provided by the reference voltage providing end; The second input end of the voltage comparison circuit is connected to the first induction line of the corresponding liquid leakage induction unit, and the second input end is configured to receive the voltage of the first induction line of the corresponding liquid leakage induction unit; The voltage comparison circuit is configured to compare the voltage of the first induction line with the preset reference voltage, and output a liquid leakage detection result or a wire break detection result through the corresponding output end according to the comparison result.

12. The liquid leakage detection circuit according to claim 11, wherein, It further includes a processing unit; The processing unit is configured to provide the liquid leakage detection signal or the wire break detection signal to the polarity control unit, and read the liquid leakage detection result or the wire break detection result output by the output end corresponding to each voltage comparison circuit.

13. The liquid leakage detection circuit according to claim 12, wherein, It further includes an interface expansion unit, and the interface expansion unit includes preset input / output interfaces configured in one-to-one correspondence with the voltage comparison circuits; The processing unit is connected to the interface expansion unit through a bus, and the output end of each voltage comparison circuit is connected to the corresponding preset input / output interface in the interface expansion unit.

14. The liquid leakage detection circuit according to claim 1, wherein, The number of the liquid leakage induction units is multiple, and the second induction lines of the multiple liquid leakage induction units are electrically connected.

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