Capacitor capacity detection circuit, detection method and related device

Abstract

The invention provides a capacitor capacity detection circuit, a capacitor capacity detection method and a related device, which are applied to the technical field of capacitor detection. The detection circuit comprises a reference capacitor, a detection module and a processing module. The processing module is electrically connected with the reference capacitor and used for sending out a control signal. The detection module is electrically connected with the reference capacitor, the detection module is electrically connected with the processing module, and the detection module is used for detecting a feedback signal of the reference capacitor under the action of the control signal and sending detection information obtained through detection to the processing module. The processing module is further used for determining the capacitance value of the reference capacitor according to the detection information, comparing the capacitance value of the reference capacitor with an early warning threshold value, and sending out early warning information when the capacitance value of the reference capacitor is smaller than the early warning threshold value. By monitoring the capacitance value of the reference capacitor in real time, online monitoring of the capacitance of the target capacitor can be realized, so that the fault of the target capacitor can be warned in advance, and the reliability of the circuit board is improved.

Description

Technical Field

[0001] The present application relates to the field of capacitance detection technology, and in particular to a capacitance detection circuit, a detection method and related devices. Background Art

[0002] With the continuous development of electronic technology, capacitors are widely used in various circuits such as energy storage, bypass, delay, tuning, etc. In some highly complex electronic products, the number of capacitors in the circuit board even reaches thousands. Usually, the capacity of the capacitor will gradually decay as the circuit board is used for a longer time. When the capacity of the capacitor decays to a certain extent, it will cause various abnormalities on the circuit board.

[0003] However, the capacitor itself has no detection function. During the use of the circuit board, the circuit board cannot detect the capacity of the capacitor online, so the risk of circuit board failure cannot be identified in advance. In the prior art, the abnormality of the capacitor capacity can only be discovered by analyzing the cause of the failure after the circuit board has an abnormal operation, and the failure of the capacitor cannot be warned in advance. Summary of the invention

[0004] The embodiments of the present application provide a capacitor capacity detection circuit, a detection method and related devices, which are used to realize online detection of capacitor capacity and provide early warning of capacitor failure.

[0005] In the first aspect, an embodiment of the present application provides a detection circuit for capacitance, and the detection circuit provided by the embodiment of the present application may include: a reference capacitor, a detection module and a processing module. The processing module is electrically connected to the reference capacitor, and the processing module is used to send a control signal. The detection module is electrically connected to the reference capacitor, and the detection module is electrically connected to the processing module. The detection module is used to detect the feedback signal of the reference capacitor under the action of the control signal, and send the detection information obtained by the detection to the processing module. The processing module is also used to determine the capacitance of the reference capacitor based on the detection information, compare the capacitance of the reference capacitor with the warning threshold, and send a warning message when the capacitance of the reference capacitor is less than the warning threshold.

[0006] In the detection circuit in the embodiment of the present application, by setting the detection module and the processing module in the detection circuit, the online detection of the capacitance of the reference capacitor can be realized. In addition, the processing module can compare the capacitance of the reference capacitor with the early warning threshold, and when the capacitance of the reference capacitor is less than the early warning threshold, an early warning message is issued. The capacitance of the reference capacitor can reflect the capacitance of the target capacitor. If the capacitance of the reference capacitor is detected to drop to the early warning threshold, it indicates that there is a risk of failure in the capacitance of the target capacitor. Therefore, by real-time monitoring of the capacitance of the reference capacitor, online monitoring of the capacitance of the target capacitor can be realized, and early warning of the failure of the target capacitor can be given, thereby improving the reliability of the circuit board.

[0007] In order to make the capacitance of the reference capacitor accurately reflect the capacitance of the target capacitor, the initial capacitance of the reference capacitor is equal to or close to that of the target capacitor, and the capacitance decay speed of the reference capacitor and the target capacitor is basically the same. In the specific setting, the material type of the reference capacitor and the target capacitor is the same. For example, the reference capacitor and the target capacitor can both be ceramic capacitors. The reference capacitor can use the same batch of capacitors as the target capacitor, that is, the reference capacitor and the target capacitor can use the same coding. In addition, the reference capacitor can be set on the circuit board where the target capacitor is located, and the reference capacitor and the target capacitor are placed close to each other on the circuit board. For example, the distance between the reference capacitor and the target capacitor can be less than 10 millimeters (mm). In this way, the working environment of the reference capacitor and the target capacitor is the same or similar. For example, the mechanical stress, temperature stress and other factors to which the reference capacitor and the target capacitor are subjected during operation are consistent, so that the capacitance decay speed of the reference capacitor and the target capacitor is basically the same.

[0008] In the specific implementation, the detection circuit can be controlled to perform detection operations regularly, and the detection frequency of the detection circuit can be reasonably set according to actual needs. For example, the capacity of the capacitor usually changes slowly, and the detection frequency of the detection circuit can be set to perform a detection operation once a day, a week, a month, or a quarter. The detection circuit can be in a dormant state for the rest of the time. Of course, the detection circuit can also be controlled to perform detection operations according to other rules or at any other time, which can be set according to actual needs. In practical applications, in order to ensure that the target capacitor is in a normal working state, the detection circuit can be controlled to perform multiple detection operations continuously. When the capacitance of the detected reference capacitor is greater than the warning threshold for multiple times (for example, three times), the detection circuit is controlled to stop the detection operation; as long as it is detected that the capacitance of any reference capacitor is less than the warning threshold, a warning message is issued.

[0009] Furthermore, in the detection circuit provided in the embodiment of the present application, the processing module can also be used to report sample information to the processor, and receive the early warning threshold sent by the processor to correct the early warning threshold. Among them, the sample information may include: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times. This arrangement allows the processing module to interact with the processor to realize the correction of the early warning threshold and improve the early warning accuracy and reliability of the detection circuit. In a possible implementation, a temperature sensor can also be set in the circuit board, and the processing module can also be used to obtain the temperature value sensed by the temperature sensor. The above-mentioned sample information also includes: multiple temperature values ​​corresponding to the reference capacitor detected multiple times. In this way, the processor can correct the early warning threshold in combination with the multiple detection capacitance values ​​and corresponding temperature values ​​of the reference capacitor, and further improve the early warning accuracy and reliability.

[0010] The detection circuit in the embodiment of the present application has multiple implementation methods, and the specific structure of the detection circuit in the embodiment of the present application is described in detail below.

[0011] In some embodiments of the present application, the capacitance of the reference capacitor can be calculated by detecting the charging time of the reference capacitor. The above detection circuit may also include: a trigger module, the trigger module may include a first end and a second end, and the reference capacitor may include a first pole and a second pole. The first end of the trigger module is electrically connected to the processing module, the second end is electrically connected to the first pole of the reference capacitor, the first pole of the reference capacitor is electrically connected to the first potential, and the second pole is electrically connected to the ground terminal. The processing module is specifically used to send a control signal to the first end of the trigger module. The trigger module is used to control the reference capacitor to charge and discharge under the action of the control signal. In an embodiment of the present application, the processing module can control the reference capacitor to charge and discharge through the trigger module. When the capacitance of the reference capacitor changes, the charging time will change with the capacitance. In this way, by detecting the charging time of the reference capacitor, the capacitance of the reference capacitor can be calculated. In practical applications, the processing module can also send a detection instruction to the detection module at the same time or before sending the control signal to activate the detection module to prepare for detecting the feedback signal of the reference capacitor.

[0012] In a possible implementation, the charging time of the reference capacitor can be determined by detecting the pulse width of the feedback signal. The detection module is electrically connected to the first pole of the reference capacitor, and the detection module can be used to detect the pulse width of the feedback signal output by the reference capacitor, and the above detection information is used to indicate the pulse width. In a specific setting, the detection module may include a pulse width detection circuit. During the charging process of the reference capacitor, the feedback signal gradually rises from a low level to a high level. When the capacitance of the reference capacitor changes, the pulse width of the feedback signal will also change with the capacitance, so that the charging time of the reference capacitor can be obtained by detecting the pulse width of the feedback signal. In practical applications, the above detection circuit may also include: a shaping module, the shaping module is electrically connected to the first pole of the reference capacitor, and the shaping module is electrically connected to the detection module, the shaping module can be used to shape the feedback signal, and the shaped feedback signal is sent to the detection module, the shaping module can convert the waveform of the feedback signal into a regular waveform, so that the detection accuracy of the detection module can be improved.

[0013] In another possible implementation, the charging time of the reference capacitor can be determined by the time difference between the control signal and the feedback signal. The trigger module may also include a third terminal, the first end of the trigger module is electrically connected to the processing module, the second end is electrically connected to the first pole of the reference capacitor, and the third end is electrically connected to the detection module. The first pole of the reference capacitor is electrically connected to the first potential, and the second pole is electrically connected to the ground terminal. The processing module can be specifically used to send a control signal to the trigger module and the detection module, and the processing module can send the control signal to the trigger module and the detection module simultaneously or approximately simultaneously. In addition, the processing module can also send a detection instruction to the detection module at the same time or before sending the control signal to the detection module to activate the detection module and prepare to detect the feedback signal of the reference capacitor. The trigger module can be used to control the reference capacitor to charge and discharge under the action of the control signal. The reference capacitor is used to output a feedback signal through the third terminal after charging. The detection module is used to detect the time difference between the control signal and the feedback signal, and the above detection information is used to indicate the time difference. When specifically set, the detection module may include a delay detection circuit. Since the reference capacitor starts to charge under the action of the control signal and outputs a feedback signal after the charging is completed, the charging time of the reference capacitor can be approximately equal to the time difference between the control signal and the feedback signal.

[0014] In other embodiments of the present application, the capacitance of the reference capacitor can be calculated by detecting the frequency of charging and discharging of the reference capacitor. The reference capacitor may include a first pole and a second pole, and the processing module is electrically connected to the first pole of the reference capacitor, and the processing module is used to send a control signal to the first pole to control the reference capacitor to charge and discharge. The detection module is electrically connected to the first pole of the reference capacitor, and the detection module is used to detect the frequency of the feedback signal output by the reference capacitor, and the above detection information is used to indicate the frequency. Exemplarily, the detection module may include a frequency detection circuit. In a specific setting, the processing module may be electrically connected to the first pole of the reference capacitor through a resistor, and the second pole of the reference capacitor may be electrically connected to the ground terminal. The charging time of the reference capacitor may be equal to the product between the resistance value of the resistor and the capacitance value of the reference capacitor, and the frequency of charging and discharging may be the inverse of the charging time. In an embodiment of the present application, the processing module may control the reference capacitor to charge and discharge by sending a control signal, and when the capacitance value of the reference capacitor changes, the frequency of charging and discharging will change with the capacitance value. Therefore, by detecting the frequency of charging and discharging of the reference capacitor, the capacitance value of the reference capacitor can be calculated. In practical applications, while or before the processing module issues the control instruction, it can also send a detection instruction to the detection module to activate the detection module and prepare to detect the feedback signal of the reference capacitor. In practical applications, the feedback signal output by the reference capacitor may be irregular, and the detection circuit may also include: a shaping module, the shaping module is electrically connected to the first pole of the reference capacitor, and the shaping module is electrically connected to the detection module, the shaping module can be used to shape the feedback signal, and send the shaped feedback signal to the detection module. By setting a shaping module electrically connected to the reference capacitor, the waveform of the feedback signal can be converted into a regular waveform, thereby improving the detection accuracy of the detection module.

[0015] The above is a detailed introduction to the implementation method of the detection circuit in the embodiment of the present application. In the specific implementation, the detection circuit can also adopt other methods and can be reasonably configured according to actual needs. Examples will not be given one by one here.

[0016] In the specific implementation, a reference capacitor can be set in the detection circuit, or at least two reference capacitors can be set in the detection circuit, which can be set according to actual needs. When the detection circuit includes at least two reference capacitors, the reference capacitors in the detection circuit can be connected in parallel. The detection circuit can also include: a switching module, each reference capacitor in the detection circuit can be connected to the detection module through the switching module, and the switching module is used to switch the connection state between each reference capacitor and the detection module. In the specific implementation, the processing module can be electrically connected to the switching module, and the processing module can send a switching instruction to the switching module to control the switching module to switch the connection state between the reference capacitor and the detection module. During the detection process, the processing module can send a control signal to each reference capacitor in a time-sharing manner, and control the switching module to switch the connection state between the reference capacitor and the detection module, so that the detection module detects the feedback signal of each reference capacitor in a time-sharing manner, thereby realizing the detection of the capacitance of each reference capacitor. In this way, multiple reference capacitors can share components such as processing modules and detection modules in the detection circuit, thereby simplifying the circuit structure in the circuit board. In a specific implementation, at least two capacitors in the functional circuit can be used as the target capacitors, and a reference capacitor can be set near each target capacitor. Thus, the capacitance of multiple target capacitors can be reflected by one detection circuit.

[0017] In some cases, when there are many capacitors to be detected in the functional circuit, multiple detection circuits can be set in the circuit board, and one or more reference capacitors can be set in each detection circuit. The multiple capacitors to be detected can be used as the target capacitors, and each target capacitor can be set corresponding to at least one reference capacitor. In this way, the capacitance of the reference capacitor is detected by the detection circuit to reflect the capacitance of the corresponding target capacitor.

[0018] In the second aspect, the embodiment of the present application further provides a circuit board, and the circuit board provided by the embodiment of the present application may include: a functional circuit and a detection circuit for any capacitance in the first aspect above. The functional circuit includes a target capacitance, and the capacitance in a key module or key component in the functional circuit can be used as the target capacitance. Of course, other capacitances in the functional circuit can also be used as target capacitances, which can be set according to actual needs. The reference capacitance in the detection circuit is insulated from the target capacitance, and the capacitance value of the reference capacitance detected by the detection circuit is used to indicate the capacitance of the target capacitance.

[0019] In the circuit board provided in the embodiment of the present application, a capacitance detection circuit is provided in the circuit board, and the reference capacitor in the detection circuit can be used to indicate the capacitance of the target capacitor, and the capacitance of the target capacitor can be reflected by detecting the capacitance value of the reference capacitor. Thus, during the use of the circuit board, the capacitance of the target capacitor can be detected in real time, the online detection of the capacitance of the target capacitor can be achieved, and the failure of the target capacitor can be warned in advance. In addition, the reference capacitor and the target capacitor are insulated from each other, and the detection process of the reference capacitor by the detection circuit will not affect the normal operation of the target capacitor.

[0020] In a third aspect, an embodiment of the present application further provides a processor, which is used to obtain sample information reported by a circuit board, correct the warning threshold according to the sample information, and send the corrected warning threshold to the circuit board; wherein the sample information includes: the capacitance of the reference capacitor obtained by multiple detections. In an embodiment of the present application, the processor can correct the warning threshold according to the sample information reported by the circuit board, so that the detection circuit can promptly detect the target capacitor with a risk of failure, and prevent the normal target capacitor from being misjudged as having a risk of failure, thereby improving the warning accuracy and reliability of the detection circuit.

[0021] In a fourth aspect, an embodiment of the present application further provides a capacitance detection system, and the capacitance detection system provided by the embodiment of the present application may include: any circuit board in the second aspect and any processor in the third aspect, and the circuit board is electrically connected to the processor. The circuit board can realize information exchange with the processor, for example, the circuit board can exchange information with the processor when powered on, when a fault occurs, or regularly. Exemplarily, the processor can be a device or equipment with data processing function such as a server.

[0022] In one possible implementation, the circuit board can be used to report sample information to the processor, and the sample information may include: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times. For example, the multiple capacitance values ​​in the sample information may include: the initial value of the reference capacitor when it is powered on, the capacitance value during normal operation, the capacitance value when a fault occurs, etc. The processor can be used to correct the warning threshold value according to the sample information, and send the corrected warning threshold value to the circuit board. In the embodiment of the present application, the processor can correct the warning threshold value according to the sample information of the reference capacitor, so that the detection circuit can promptly detect the target capacitor with a risk of failure, and prevent the normal target capacitor from being misjudged as having a risk of failure, thereby improving the warning accuracy and reliability of the detection circuit.

[0023] In one possible implementation, the processor may collect sample information of one or more reference capacitors in the same circuit board, and correct the warning threshold by analyzing the sample information of one or more reference capacitors. In another possible implementation, the detection system in the embodiment of the present application may include multiple circuit boards, and the processor may be used to obtain sample information reported by multiple circuit boards, correct the warning threshold according to the sample information reported by each circuit board, and send the corrected warning threshold to each circuit board respectively. In this way, the processor can further improve the warning accuracy and reliability of the detection circuit by collecting and analyzing sample information of reference capacitors in multiple circuit boards and correcting the warning threshold.

[0024] In practical applications, the sample information may also include: multiple temperature values ​​corresponding to multiple detections of the reference capacitor. In this way, the processor can correct the warning threshold based on the multiple detection values ​​of the reference capacitor and the corresponding temperature values, further improving the accuracy and reliability of the warning.

[0025] In some embodiments of the present application, the processor can process the sample information reported by the circuit board, and construct a data model according to the sample information reported by the circuit board. For example, the data model can be a decision tree model, and the warning threshold is corrected according to the constructed data model. Specifically, the processor can pre-construct a data model based on known capacitance data, and the data model can include a fault capacitance range and a non-fault capacitance range, and the boundary between the fault capacitance range and the non-fault capacitance range can be used as the warning threshold. Then, the processor processes the sample information reported by the circuit board, for example, the data such as the capacitance value and the capacitance value in the sample information can be normalized, and the fault prediction value of the reference capacitor is predicted according to the processed sample information and the pre-constructed data model; if the fault prediction value is within the fault capacitance range, the reference capacitor is judged to have a fault risk; if the fault prediction value is within the non-fault capacitance range, the reference capacitor is judged to have no fault risk. The processor can also update the sample information obtained each time into the data model, and adjust the fault capacitance range and the non-fault capacitance range according to the sample information to adjust the warning threshold, thereby improving the accuracy of the data model.

[0026] In a fifth aspect, an embodiment of the present application further provides an electronic device, and the electronic device provided by the embodiment of the present application may include: any circuit board and a housing in the second aspect, wherein the circuit board is located inside the housing. The technical solution provided by the embodiment of the present application can detect the capacity of the capacitor in the circuit board, realize early warning of capacitor failure, and make the circuit board more reliable, so the reliability of the electronic device including the circuit board provided by the embodiment of the present application is also higher.

[0027] In a sixth aspect, the embodiments of the present application further provide a method for detecting capacitance. The method for detecting capacitance provided by the embodiments of the present application may include:

[0028] Step 1: The processing module sends a control signal;

[0029] Step 2: The detection module detects the feedback signal of the reference capacitor under the action of the control signal, and sends the detection information obtained by the detection to the processing module;

[0030] Step 3: The processing module determines the capacitance of the reference capacitor according to the detection information, compares the capacitance of the reference capacitor with the warning threshold, and issues a warning message when the capacitance of the reference capacitor is less than the warning threshold.

[0031] In the detection method of the capacitance provided by the embodiment of the present application, the processing module can control the reference capacitor to charge and discharge by a control signal, the detection module can detect the feedback signal of the reference capacitor under the action of the control signal, and send the detection information obtained by the detection to the processing module, and the processing module can determine the capacitance of the reference capacitor according to the detection information, thereby, the online detection of the capacitance of the reference capacitor can be realized. In addition, the processing module can also compare the capacitance of the reference capacitor with the early warning threshold, and issue an early warning message when the capacitance of the reference capacitor is less than the early warning threshold. The capacitance of the reference capacitor can reflect the capacitance of the target capacitor. If the capacitance of the reference capacitor is detected to drop to the early warning threshold, it means that the capacitance of the target capacitor has a risk of failure. Therefore, by real-time monitoring of the capacitance of the reference capacitor, the online monitoring of the capacitance of the target capacitor can be realized, and the failure of the target capacitor can be warned in advance, thereby improving the reliability of the circuit board.

[0032] In specific implementation, the above steps 1 to 3 can be performed by any detection circuit in the above first aspect, the detection circuit can be controlled regularly to perform detection operations, and the detection frequency of the detection circuit can be reasonably set according to actual needs. For example, the capacity of the capacitor usually changes slowly, and the detection frequency of the detection circuit can be set to perform a detection operation once a day, a week, a month, or a quarter, and the detection circuit can be in a dormant state for the rest of the time. Of course, the detection circuit can also be controlled to perform detection operations according to other rules or at any other time, which can be set according to actual needs. In practical applications, in order to ensure that the target capacitor is in a normal working state, the detection circuit can be controlled to perform multiple detection operations continuously. When the capacitance of the detected reference capacitor is greater than the warning threshold for multiple times (for example, three times), the detection circuit is controlled to stop the detection operation; if it is detected that the capacitance of any reference capacitor is less than the warning threshold, a warning message is issued.

[0033] Furthermore, the detection method in the embodiment of the present application may also modify the warning threshold. Specifically, the detection method in the embodiment of the present application may further include:

[0034] Step 4: The processing module reports sample information to the processor, where the sample information includes: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times. For example, the multiple capacitance values ​​in the sample information may include: the initial power-on value of the reference capacitor, the capacitance value during normal operation, the capacitance value when a fault occurs, etc.

[0035] Step 5: The processor modifies the warning threshold according to the sample information and sends the modified warning threshold to the processing module.

[0036] In specific implementation, the above steps 4 and 5 can be executed by any detection system in the above fourth aspect. In the embodiment of the present application, the processor can correct the warning threshold according to the sample information of the reference capacitor, so that the detection circuit can promptly detect the target capacitor with failure risk and prevent the normal target capacitor from being misjudged as having failure risk, thereby improving the warning accuracy and reliability of the detection circuit.

[0037] In one possible implementation, the processor can collect sample information of one or more reference capacitors in the same circuit board, and correct the warning threshold by analyzing the sample information of one or more reference capacitors. In another possible implementation, when the detection system includes multiple circuit boards, the processor can be used to obtain sample information reported by processing modules in multiple circuit boards, correct the warning threshold according to the sample information reported by each circuit board, and send the corrected warning threshold to the processing modules in each circuit board respectively. In this way, the processor can further improve the warning accuracy and reliability of the detection circuit by collecting and analyzing sample information of reference capacitors in multiple circuit boards and correcting the warning threshold.

[0038] In practical applications, the sample information may also include: multiple temperature values ​​corresponding to multiple detections of the reference capacitor. In this way, the processor can correct the warning threshold based on the multiple detection values ​​of the reference capacitor and the corresponding temperature values, further improving the accuracy and reliability of the warning.

[0039] In some embodiments of the present application, the processor can process the sample information reported by the circuit board and construct a data model based on the sample information reported by the circuit board. Exemplarily, the data model can be a decision tree model, and the warning threshold can be modified based on the constructed data model. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a circuit board provided in an embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the structure of the detection circuit in the embodiment of the present application;

[0043] Figure 4 Another structural schematic diagram of the detection circuit in the embodiment of the present application;

[0044] Figure 5 Another structural schematic diagram of the detection circuit in the embodiment of the present application;

[0045] Figure 6 Another structural schematic diagram of the detection circuit in the embodiment of the present application;

[0046] Figure 7 for Figure 6 A schematic diagram showing a comparison of waveforms of various signals in the detection circuit shown;

[0047] Figure 8 Another structural schematic diagram of the detection circuit in the embodiment of the present application;

[0048] Fig. 9 Schematic diagram of the structure of the capacitance detection system in the embodiment of the present application;

[0049] Fig.10 A flow chart of a method for detecting capacitance provided in an embodiment of the present application;

[0050] Fig.11 Another flow chart of the method for detecting the capacitance provided in the embodiment of the present application;

[0051] Fig.12 Schematic diagram of the processing flow of the processor in the embodiment of the present application.

[0052] Reference numerals:

[0053] 100-electronic device; 101-circuit board; 102-housing; 200-processor; 20-functional circuit; 201-target capacitor; 30-detection circuit; 301-reference capacitor; 302-detection module; 303-processing module; 304-trigger module; 304a-logic gate circuit; 305-resistance; 306-shaping module; 307-switching module; A1-first end; A2-second end; A3-third end; V-first potential; C1-first pole; C2-second pole; M1-first transistor; M2-second transistor. DETAILED DESCRIPTION

[0054] In order to realize online detection of capacitor capacity and provide early warning for capacitor failure, the present application embodiment provides a detection circuit, detection method and related device of capacitor capacity. The present application can be applied to various circuits containing capacitors, such as energy storage, bypass, delay, tuning and other circuits. The circuit board provided by the present application embodiment can be applied to various types of electronic devices, such as network equipment, telecommunication equipment, mobile phones, tablet computers, laptop computers, smart wearable devices, smart TVs, smart door locks, smart home appliances and other electronic devices.

[0055] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0056] It should be noted that the drawings of the present application are only used to illustrate the relative position relationship and do not represent the true scale. The same reference numerals in the drawings of the present application represent the same or similar structures, and thus their repeated description will be omitted.

[0057] Words expressing position and direction described in this application, such as the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are all based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. Changes can also be made as needed, and all changes are included in the scope of protection of this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0058] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application, such as Figure 1 As shown, the electronic device 100 provided in the embodiment of the present application may include: a circuit board 101 and a housing 102, the circuit board 101 is located inside the housing 102, and illustratively, the circuit board 101 in the embodiment of the present application may be a single board, and of course, the circuit board 101 in the embodiment of the present application may also have other forms. The technical solution provided in the embodiment of the present application can detect the capacity of the capacitor in the circuit board 101, realize early warning of capacitor failure, and make the reliability of the circuit board 101 higher, so the reliability of the electronic device 100 including the circuit board 101 provided in the embodiment of the present application is also higher.

[0059] Figure 2 A schematic diagram of the structure of the circuit board provided in the embodiment of the present application, such as Figure 2As shown, the circuit board 101 provided in the embodiment of the present application may include: a functional circuit 20 and a capacitance detection circuit 30. The functional circuit 20 is used to enable the circuit board 101 to achieve corresponding functions. For example, by setting the circuit structure of the functional circuit 20, the circuit board 101 can achieve functions such as energy storage, bypass, delay, tuning, etc., and the function of the functional circuit 20 can be reasonably set according to actual needs. Among them, the functional circuit 20 may include a target capacitor 201, and the capacitor in the key module or key component in the functional circuit 20 can be used as the target capacitor 201. Of course, other capacitors in the functional circuit 20 can also be used as the target capacitor 201, which can be set according to actual needs. The detection circuit 30 may include a reference capacitor 301, and the reference capacitor 301 is insulated from the target capacitor 201. The capacitance of the reference capacitor 301 detected by the detection circuit 30 is used to indicate the capacitance of the target capacitor 201.

[0060] In order to make the capacitance of the reference capacitor 301 accurately reflect the capacitance of the target capacitor 201, the initial capacitance of the reference capacitor 301 is equal to or close to that of the target capacitor 201, and the capacitance attenuation speed of the reference capacitor 301 is substantially the same as that of the target capacitor 201. In the specific setting, the reference capacitor 301 and the target capacitor 201 are made of the same material type. For example, the reference capacitor 301 and the target capacitor 201 can both be ceramic capacitors. The reference capacitor 301 can use capacitors from the same batch as the target capacitor 201, that is, the reference capacitor 301 and the target capacitor 201 can use the same coding. Furthermore, the reference capacitor 301 and the target capacitor 201 are placed close to each other on the circuit board 101. For example, the distance between the reference capacitor 301 and the target capacitor 201 can be less than 10 millimeters (mm). In this way, the working environment of the reference capacitor 301 and the target capacitor 201 is the same or similar. For example, the mechanical stress, temperature stress and other factors to which the reference capacitor 301 and the target capacitor 201 are subjected during operation are consistent, so that the capacitance attenuation rates of the reference capacitor 301 and the target capacitor 201 are basically the same.

[0061] In the circuit board 101 provided in the embodiment of the present application, a capacitance detection circuit 30 is provided in the circuit board 101, and the reference capacitor 301 in the detection circuit 30 can be used to indicate the capacitance of the target capacitor 201, and the capacitance of the target capacitor 201 can be reflected by detecting the capacitance value of the reference capacitor 301. Thus, during the use of the circuit board 101, the capacitance of the target capacitor 201 can be detected in real time, the capacitance of the target capacitor 201 can be detected online, and the failure of the target capacitor 201 can be warned in advance. In addition, the reference capacitor 301 is insulated from the target capacitor 201, and the detection process of the reference capacitor 301 by the detection circuit 30 will not affect the normal operation of the target capacitor 201.

[0062] Figure 3 Schematic diagram of the structure of the detection circuit in the embodiment of the present application. Figure 3 As shown, the detection circuit 30 of the capacitance in the embodiment of the present application may include: a reference capacitor 301, a detection module 302 and a processing module 303. The processing module 303 is electrically connected to the reference capacitor 301, and the processing module 303 is used to send a control signal. The detection module 302 is electrically connected to the reference capacitor 301, and the detection module 302 is electrically connected to the processing module 303. The detection module 302 is used to detect the feedback signal of the reference capacitor 301 under the action of the control signal, and send the detection information obtained by the detection to the processing module 303. The processing module 303 is also used to determine the capacitance of the reference capacitor 301 according to the detection information, compare the capacitance of the reference capacitor 301 with the warning threshold, and send a warning message when the capacitance of the reference capacitor 301 is less than the warning threshold.

[0063] In the detection circuit 30 in the embodiment of the present application, by setting the detection module 302 and the processing module 303 in the detection circuit 30, the online detection of the capacitance of the reference capacitor 301 can be realized. In addition, the processing module 303 can compare the capacitance of the reference capacitor 301 with the early warning threshold, and when the capacitance of the reference capacitor 301 is less than the early warning threshold, an early warning message is issued. The capacitance of the reference capacitor 301 can reflect the capacitance of the target capacitor. If the capacitance of the reference capacitor 301 is detected to drop to the early warning threshold, it indicates that there is a risk of failure in the capacitance of the target capacitor 201. Therefore, by real-time monitoring of the capacitance of the reference capacitor 301, online monitoring of the capacitance of the target capacitor 201 can be realized, and the failure of the target capacitor 201 is warned in advance, thereby improving the reliability of the circuit board.

[0064] In specific implementation, the detection circuit 30 can be controlled to perform detection operations regularly, and the detection frequency of the detection circuit 30 can be reasonably set according to actual needs. For example, the capacitance of the capacitor usually changes slowly, and the detection frequency of the detection circuit 30 can be set to perform a detection operation once a day, a week, a month, or a quarter. The detection circuit 30 can be in a dormant state at other times. Of course, the detection circuit 30 can also be controlled to perform detection operations according to other rules or at any other time, which can be set according to actual needs.

[0065] In practical applications, in order to ensure that the target capacitor is in a normal working state, the detection circuit 30 can be controlled to perform multiple detection operations continuously. When the capacitance of the detected reference capacitor 301 is greater than the warning threshold for multiple consecutive times (for example, three times), the detection circuit 30 is controlled to stop the detection operation; as long as it is detected that the capacitance of the reference capacitor 301 is less than the warning threshold at any time, a warning message is issued.

[0066] Further, in the detection circuit 30 provided in the embodiment of the present application, the processing module 303 can also be used to report sample information to the processor and receive the warning threshold sent by the processor to correct the warning threshold. Among them, the sample information may include: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times. This setting allows the processing module 303 to interact with the processor to realize the correction of the warning threshold and improve the warning accuracy and reliability of the detection circuit 30.

[0067] In a possible implementation, a temperature sensor may also be provided in the circuit board ( Figure 3 The processing module 303 may also be used to obtain the temperature value sensed by the temperature sensor. The sample information also includes: multiple temperature values ​​corresponding to the reference capacitor 301 detected multiple times. In this way, the processor can correct the warning threshold value by combining the multiple detection capacitance values ​​and the corresponding temperature values ​​of the reference capacitor 301, thereby further improving the accuracy and reliability of the warning.

[0068] The detection circuit in the embodiment of the present application has multiple implementation methods. The specific structure of the detection circuit in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0069] In some embodiments of the present application, the capacitance of the reference capacitor can be calculated by detecting the charging time of the reference capacitor. Figure 4 As shown, Figure 4 Another structural diagram of the detection circuit in the embodiment of the present application, the detection circuit 30 may also include: a trigger module 304, the trigger module 304 may include a first terminal A1 and a second terminal A2, and the reference capacitor 301 may include a first pole C1 and a second pole C2. The first terminal A1 of the trigger module 304 is electrically connected to the processing module 303, and the second terminal A2 is electrically connected to the first pole C1 of the reference capacitor 301. The first pole C1 of the reference capacitor 301 is electrically connected to the first potential V, and the second pole C2 is electrically connected to the ground terminal. The processing module 303 is specifically used to send a control signal to the first terminal A1 of the trigger module 304. The trigger module 304 is used to control the reference capacitor 301 to charge and discharge under the action of the control signal. In the embodiment of the present application, the processing module 303 can control the reference capacitor 301 to charge and discharge through the trigger module 304. When the capacitance of the reference capacitor 301 changes, the charging time will change with the capacitance. In this way, by detecting the charging time of the reference capacitor 301, the capacitance of the reference capacitor 301 can be calculated. In practical applications, the processing module 303 may send a detection instruction to the detection module 302 at the same time or before sending the control signal to activate the detection module 302 to prepare to detect the feedback signal of the reference capacitor 301 .

[0070] In a possible implementation, the charging time of the reference capacitor can be determined by detecting the pulse width of the feedback signal. Figure 4 , the detection module 302 is electrically connected to the first electrode C1 of the reference capacitor 301, and the detection module 302 can be used to detect the pulse width of the feedback signal output by the reference capacitor 301, and the above detection information is used to indicate the pulse width. In the specific setting, the detection module 302 may include a pulse width detection circuit. During the charging process of the reference capacitor 301, the feedback signal gradually increases from a low level to a high level. When the capacitance of the reference capacitor 301 changes, the pulse width of the feedback signal will also change with the capacitance. Therefore, by detecting the pulse width of the feedback signal, the charging time of the reference capacitor 301 can be obtained.

[0071] In a specific implementation, the control signal sent by the processing module 303 to the trigger module 304 can be a low-level pulse, and the trigger module 304 can control the reference capacitor 301 to discharge first and then charge under the action of the low-level pulse, so that the pulse width of the feedback signal is approximately equal to the charging time of the reference capacitor 301, thereby making the calculated capacitance of the reference capacitor 301 more accurate. Specifically, the trigger module 304 may include: a logic gate circuit 304a, a first transistor M1 and a second transistor M2, the logic gate circuit 304a is electrically connected to the first terminal A1, the gate of the first transistor M1 and the gate of the second transistor M2 are both electrically connected to the logic gate circuit 304a, and the drain of the first transistor M1 and the source of the second transistor M2 are both electrically connected to the second terminal A2. When the trigger module 304 inputs a low level pulse at the first terminal A1, the logic gate circuit 304a controls the first transistor M1 to be turned off and the second transistor M2 to be turned on under the action of the low level pulse, and pulls the voltage of the first electrode C1 of the reference capacitor 301 down to the ground level, so that the feedback signal jumps from a high level (for example, 3.3V) to zero. Then, the logic gate circuit 304a controls the second transistor M2 to be turned off, and charges the reference capacitor 301 through the first potential V. In a specific setting, a resistor 305 is also connected between the first electrode C1 of the reference capacitor 301 and the first potential V. The charging time T of the reference capacitor 301 can be equal to the product between the resistance R of the resistor 305 and the capacitance C of the reference capacitor 301, that is, T=RC. Exemplarily, the trigger module 304 in the embodiment of the present application may include a Schmitt trigger circuit. Due to the internal circuit of the Schmitt trigger, when the first electrode C1 of the reference capacitor 301 is charged to a critical voltage (e.g., 2.4V), the voltage of the first electrode C1 will be directly pulled up to a high level (e.g., 3.3V), thereby obtaining Figure 4 The waveform of the feedback signal is shown.

[0072] In practical applications, the detection circuit 30 may further include: a shaping module 306, the shaping module 306 is electrically connected to the first electrode C1 of the reference capacitor 301, and the shaping module 306 is electrically connected to the detection module 302, and the shaping module 306 may be used to shape the feedback signal and send the shaped feedback signal to the detection module 302. Since the waveform of the feedback signal output by the reference capacitor 301 may be irregular, by providing the shaping module 306 electrically connected to the reference capacitor 301, the waveform of the feedback signal can be converted into a regular waveform with a high level (e.g., 3.3V) and a low level (e.g., 0V), thereby improving the detection accuracy of the detection module 302.

[0073] In another possible implementation, the charging time of the reference capacitor may be determined by the time difference between the control signal and the feedback signal. Figure 5 As shown, Figure 5 Another structural diagram of the detection circuit in the embodiment of the present application, the trigger module 304 may also include a third terminal A3, the first terminal A1 of the trigger module 304 is electrically connected to the processing module 303, the second terminal A2 is electrically connected to the first pole C1 of the reference capacitor 301, and the third terminal A3 is electrically connected to the detection module 302. The first pole C1 of the reference capacitor 301 is electrically connected to the first potential V, and the second pole C2 is electrically connected to the ground terminal. The processing module 303 can be specifically used to send a control signal to the trigger module 304 and the detection module 302, and the processing module 303 can send the control signal to the trigger module 304 and the detection module 302 at the same time or approximately at the same time. Exemplarily, the control signal issued by the processing module 303 can be a low-level pulse. In addition, the processing module 303 can also send a detection instruction to the detection module 302 while or before sending a control signal to the detection module 302, so as to activate the detection module 302, and prepare to detect the feedback signal of the reference capacitor 301. The trigger module 304 can be used to control the reference capacitor 301 to charge and discharge under the action of the control signal. The reference capacitor 301 is used to output a feedback signal through the third terminal A3 after charging. The detection module 302 is used to detect the time difference between the control signal and the feedback signal, and the above detection information is used to indicate the time difference. In specific settings, the detection module 302 may include a delay detection circuit. Since the reference capacitor 301 starts to charge under the action of the control signal and outputs a feedback signal after the charging is completed, the charging time of the reference capacitor 301 can be approximately equal to the time difference between the control signal and the feedback signal. For example, the time when the processing module 303 sends the control signal to the detection module 302 is t1, and the time when the reference capacitor 301 outputs the feedback signal after charging is t2, then the charging time of the reference capacitor 301 is T=t1-t2=RC. In specific settings, the trigger module 304 may include a circuit with a signal delay function such as a Schmitt trigger circuit or a delay circuit.

[0074] In other embodiments of the present application, the capacitance of the reference capacitor can be calculated by detecting the frequency of charging and discharging of the reference capacitor. Figure 6 As shown, Figure 6 Another structural schematic diagram of the detection circuit in the embodiment of the present application, the reference capacitor 301 may include a first pole C1 and a second pole C2, the processing module 303 is electrically connected to the first pole C1 of the reference capacitor 301, and the processing module 303 is used to send a control signal to the first pole C1 to control the reference capacitor 301 to charge and discharge. The detection module 302 is electrically connected to the first pole C1 of the reference capacitor 301, and the detection module 302 is used to detect the frequency of the feedback signal output by the reference capacitor 301, and the above detection information is used to indicate the frequency. Exemplarily, the detection module 302 may include a frequency detection circuit. In a specific setting, the processing module 303 may be electrically connected to the first pole C1 of the reference capacitor 301 through the resistor 305, and the second pole C2 of the reference capacitor 301 may be electrically connected to the ground terminal. The charging time T of the reference capacitor 301 may be equal to the product between the resistance R of the resistor 305 and the capacitance C of the reference capacitor 301, that is, T=RC, and the frequency of charging and discharging may be the reciprocal of the charging time, that is, the frequency f=1 / T. In an embodiment of the present application, the processing module 303 can control the reference capacitor 301 to charge and discharge by sending a control signal. When the capacitance of the reference capacitor 301 changes, the frequency of charging and discharging will change with the capacitance. For example, when the capacitance of the reference capacitor 301 decreases, the speed of charging and discharging of the reference capacitor 301 will be accelerated, the charging time will be reduced, and the frequency of charging and discharging will be increased. Therefore, by detecting the frequency of charging and discharging of the reference capacitor 301, the capacitance of the reference capacitor 301 can be calculated. In practical applications, while or before the processing module 303 sends a control instruction, it can also send a detection instruction to the detection module 302 to activate the detection module 302 and prepare to detect the feedback signal of the reference capacitor 301.

[0075] In practical applications, the feedback signal output by the reference capacitor 301 may be irregular, and the detection circuit 30 may further include: a shaping module 306, the shaping module 306 is electrically connected to the first electrode C1 of the reference capacitor 301, and the shaping module 306 is electrically connected to the detection module 302, and the shaping module 306 can be used to shape the feedback signal and send the shaped feedback signal to the detection module 302. By providing the shaping module 306 electrically connected to the reference capacitor 301, the waveform of the feedback signal can be converted into a regular waveform, thereby improving the detection accuracy of the detection module 302.

[0076] Figure 7 for Figure 6 The waveform comparison diagram of each signal in the detection circuit shown in FIG. Figure 7(1) is a waveform diagram of the control signal. Figure 7 (2) is a waveform diagram of the feedback signal output by the reference capacitor. Figure 7 (3) in FIG. 1 is a waveform diagram of the feedback signal after shaping. Figure 6 and Figure 7 The control signal sent by the processing module 303 may be a waveform W1 having a certain frequency, for example Figure 6 and Figure 7 The square wave waveform W1 is taken as an example for illustration. The period of waveform W1 can be T1, and the frequency can be 1 / T1. The reference capacitor 301 is charged and discharged under the control of waveform W1. The feedback signal output by the reference capacitor 301 at the first pole C1 can be waveform W2. The period of waveform W2 can be T2, and the frequency can be 1 / T2. The feedback signal is shaped by the shaping module 306 to obtain waveform W3. The periods of waveform W2 and waveform W3 are approximately equal, that is, the period of waveform W3 can also be T2, and the frequency can also be 1 / T2. If the capacitance of the reference capacitor 301 decreases, the charging and discharging speed of the reference capacitor 301 will increase, and the periods of waveform W2 and waveform W3 will become shorter. Figure 7 It can be seen that the period T2 of waveform W2 and waveform W3 is significantly smaller than the period T1 of waveform W1, and the frequencies of waveform W2 and waveform W3 are greater than the frequency of waveform W1. Therefore, the frequency change of the feedback signal can reflect the capacitance change of the reference capacitor 301, and the capacitance of the reference capacitor 301 can be calculated by detecting the frequency of the feedback signal.

[0077] The above is a detailed introduction to the implementation method of the detection circuit in the embodiment of the present application. In the specific implementation, the detection circuit can also adopt other methods and can be reasonably configured according to actual needs. Examples will not be given one by one here.

[0078] Figures 4 to 6 In the embodiment, one reference capacitor is set in the detection circuit for illustration. In a specific implementation, at least two reference capacitors may also be set in the detection circuit. Figure 8 FIG. 1 is another schematic diagram of the structure of the detection circuit in the embodiment of the present application. Figure 8 As shown, the detection circuit 30 may include at least two reference capacitors 301 connected in parallel. Figure 8In the example, two reference capacitors 301 are set in the detection circuit 30. In the specific implementation, three, four or more reference capacitors 301 can also be set in the detection circuit 30, and the number of reference capacitors 301 can be reasonably set according to actual needs. The detection circuit 30 can also include: a switching module 307, each reference capacitor 301 in the detection circuit 30 can be connected to the detection module 302 through the switching module 307, and the switching module 307 is used to switch the connection state between each reference capacitor 301 and the detection module 302. In the specific implementation, the processing module 303 can be electrically connected to the switching module 307, and the processing module 303 can send a switching instruction to the switching module 307 to control the switching module 307 to switch the connection state between the reference capacitor 301 and the detection module 302. During the detection process, the processing module 303 can send control signals to each reference capacitor 301 in a time-sharing manner, and control the switching module 307 to switch the connection state between the reference capacitor 301 and the detection module 302, so that the detection module 302 detects the feedback signal of each reference capacitor 301 in a time-sharing manner, thereby realizing the detection of the capacitance value of each reference capacitor 301. In this way, multiple reference capacitors 301 can share the processing module 303, the detection module 302 and other components in the detection circuit 30, thereby simplifying the circuit structure in the circuit board. In specific implementation, at least two capacitors in the functional circuit can be used as the above-mentioned target capacitors, and a reference capacitor 301 is respectively set near each target capacitor, so that the capacitance of multiple target capacitors can be reflected by one detection circuit 30.

[0079] Figure 8 China-Israel Figure 6 Taking the circuit structure shown in FIG. 1 as an example, the structure of the detection circuit 30 including multiple reference capacitors 301 is illustrated. In a specific implementation, Figure 4 and Figure 5 The detection circuit 30 shown in the figure may also be provided with a plurality of reference capacitors 301, which may be used in the same manner as Figure 8 In a similar manner, the components in the detection circuit 30 are arranged, and examples are not given one by one here.

[0080] In some cases, when there are many capacitors to be detected in the functional circuit, multiple detection circuits can be set in the circuit board, and one or more reference capacitors can be set in each detection circuit. The multiple capacitors to be detected can be used as the target capacitors, and each target capacitor can be set corresponding to at least one reference capacitor. In this way, the capacitance of the reference capacitor is detected by the detection circuit to reflect the capacitance of the corresponding target capacitor.

[0081] Based on the same technical concept, the embodiment of the present application also provides a capacitor capacity detection system. The detection system in the embodiment of the present application is an intelligent detection, analysis and early warning system that can realize online detection of capacitor capacity and provide early warning of capacitor failure. Fig. 9 Schematic diagram of the structure of the capacitance detection system in the embodiment of the present application, such as Fig. 9 As shown, the detection system of the capacitance in the embodiment of the present application may include: any of the above-mentioned circuit boards 101 and the processor 200, and the circuit board 101 is electrically connected to the processor 200. In this way, the circuit board 101 can realize information interaction with the processor 200. For example, the circuit board 101 can interact with the processor 200 at power-on, when a fault occurs, or regularly. Among them, the circuit board 101 can perform online detection of the capacitance and has an alarm function for capacitor faults. The processor 200 can be a device or equipment with a data processing function such as a server. Exemplarily, the processor 200 may include an artificial intelligence (AI) data processing module for running on the server. Fig. 9 The example in which the processor 200 is electrically connected to three circuit boards 101 is used for illustration. In a specific implementation, the processor 200 may also be electrically connected to one, two or more circuit boards 101, and may be reasonably configured according to actual needs.

[0082] In a possible implementation, the circuit board 101 can be used to report sample information to the processor 200. The sample information may include: multiple capacitance values ​​obtained by detecting the reference capacitor 301 multiple times. For example, the multiple capacitance values ​​in the sample information may include: the initial value of the reference capacitor 301 when it is powered on, the capacitance value during normal operation, the capacitance value when a fault occurs, etc. The processor 200 can be used to correct the warning threshold value according to the sample information, and send the corrected warning threshold value to the circuit board 101. In the embodiment of the present application, the processor 200 can correct the warning threshold value according to the sample information of the reference capacitor 301, so that the detection circuit 30 can timely detect the target capacitor 201 with a risk of failure, and prevent the normal target capacitor 201 from being misjudged as having a risk of failure, thereby improving the warning accuracy and reliability of the detection circuit 30.

[0083] In one possible implementation, the processor 200 may collect sample information of one or more reference capacitors 301 in the same circuit board 101, and correct the warning threshold by analyzing the sample information of one or more reference capacitors 301. In another possible implementation, the detection system in the embodiment of the present application may include multiple circuit boards 101, and the processor 200 may be used to obtain sample information reported by multiple circuit boards 101, correct the warning threshold according to the sample information reported by each circuit board 101, and send the corrected warning threshold to each circuit board 101 respectively. In this way, the processor 200 can further improve the warning accuracy and reliability of the detection circuit 30 by collecting and analyzing the sample information of the reference capacitors 301 in multiple circuit boards 101 and correcting the warning threshold.

[0084] In practical applications, the circuit board 101 in the embodiment of the present application may further include: a temperature sensor (not shown in the figure), which is used to sense the temperature of the target capacitor 201. The above sample information may also include: multiple temperature values ​​corresponding to the multiple detections of the reference capacitor 301. In this way, the processor 200 can correct the warning threshold value in combination with the multiple detection capacitance values ​​and the corresponding temperature values ​​of the reference capacitor 301, and further improve the accuracy and reliability of the warning.

[0085] In some embodiments of the present application, the processor 200 can process the sample information reported by the circuit board 101, and construct a data model based on the sample information reported by the circuit board 101. Exemplarily, the data model can be a decision tree model, and the warning threshold can be modified based on the constructed data model.

[0086] Specifically, the processor 200 can pre-build a data model based on known capacitance data, and the data model can include a fault capacitance range and a non-fault capacitance range, and the boundary between the fault capacitance range and the non-fault capacitance range can be used as a warning threshold. Then, the processor 200 processes the sample information reported by the circuit board 101, for example, the data such as the capacitance value and the capacitance value in the sample information can be normalized, and the fault prediction value of the reference capacitor 301 is predicted based on the processed sample information and the pre-built data model; if the fault prediction value is within the fault capacitance range, the reference capacitor 301 is judged to have a fault risk; if the fault prediction value is within the non-fault capacitance range, the reference capacitor 301 is judged to have no fault risk. The processor 200 can also update the sample information obtained each time into the data model, and adjust the fault capacitance range and the non-fault capacitance range according to the sample information to adjust the warning threshold, thereby improving the accuracy of the data model.

[0087] Based on the same technical concept, the embodiment of the present application also provides a processor, which can be used to obtain sample information reported by the circuit board, correct the warning threshold according to the sample information, and send the corrected warning threshold to the circuit board; wherein the sample information may include: multiple capacitance values ​​obtained by multiple detections of the reference capacitor. The specific implementation method of the processor in the embodiment of the present application can refer to the setting method of the processor in the above-mentioned capacitance detection system, and the repeated parts will not be repeated.

[0088] Based on the same technical concept, the embodiment of the present application also provides a method for detecting the capacitance of a capacitor. Fig.10 A flow chart of a method for detecting capacitance provided in an embodiment of the present application, such as Fig.10 As shown, the capacitance detection method provided in the embodiment of the present application may include:

[0089] S401, the processing module sends a control signal;

[0090] S402, the detection module detects the feedback signal of the reference capacitor under the action of the control signal, and sends the detection information obtained by the detection to the processing module;

[0091] S403: The processing module determines the capacitance of the reference capacitor according to the detection information, compares the capacitance of the reference capacitor with the warning threshold, and issues a warning message when the capacitance of the reference capacitor is less than the warning threshold.

[0092] In the detection method of the capacitance provided by the embodiment of the present application, the processing module can control the reference capacitor to charge and discharge by a control signal, the detection module can detect the feedback signal of the reference capacitor under the action of the control signal, and send the detection information obtained by the detection to the processing module, and the processing module can determine the capacitance of the reference capacitor according to the detection information, thereby, the online detection of the capacitance of the reference capacitor can be realized. In addition, the processing module can also compare the capacitance of the reference capacitor with the early warning threshold, and issue an early warning message when the capacitance of the reference capacitor is less than the early warning threshold. The capacitance of the reference capacitor can reflect the capacitance of the target capacitor. If the capacitance of the reference capacitor is detected to drop to the early warning threshold, it means that the capacitance of the target capacitor has a risk of failure. Therefore, by real-time monitoring of the capacitance of the reference capacitor, the online monitoring of the capacitance of the target capacitor can be realized, and the failure of the target capacitor can be warned in advance, thereby improving the reliability of the circuit board.

[0093] In specific implementation, the above steps S401 to S403 can be performed by the above detection circuit, and the detection circuit can be controlled to perform detection operations regularly, and the detection frequency of the detection circuit can be reasonably set according to actual needs. For example, the capacitance of the capacitor usually changes slowly, and the detection frequency of the detection circuit can be set to perform a detection operation once a day, a week, a month, or a quarter, and the detection circuit can be in a dormant state at other times. Of course, the detection circuit can also be controlled to perform detection operations according to other rules or at any other time, which can be set according to actual needs.

[0094] In practical applications, in order to ensure that the target capacitor is in a normal working state, the detection circuit can be controlled to perform multiple detection operations continuously. When the capacitance of the detected reference capacitor is greater than the warning threshold for multiple consecutive times (for example, three times), the detection circuit is controlled to stop the detection operation; if the capacitance of the reference capacitor is detected to be less than the warning threshold at any time, a warning message is issued. Fig.11 Another flow chart of the method for detecting the capacitance provided in the embodiment of the present application is as follows: Fig.11 As shown, the capacitance detection method provided in the embodiment of the present application may specifically include:

[0095] S501, the processing module resets the number of detections to zero;

[0096] S502, the processing module sends a detection instruction to the detection module to activate the detection module, so that the detection module is ready to detect the feedback signal of the reference capacitor;

[0097] S503, the processing module sends a control signal to control the reference capacitor to charge and discharge;

[0098] S504, the detection module detects the feedback signal of the reference capacitor, and sends the detection information obtained by the detection to the processing module;

[0099] S505, the processing module updates the detection times, and increases the detection times by 1;

[0100] S506, the processing module determines the capacitance of the reference capacitor according to the detection information, and determines whether the capacitance of the reference capacitor is greater than the warning threshold; if so, execute step S507; if not, execute step S508;

[0101] S507, the processing module determines whether the number of detection times is greater than a set value; the set value may be an integer greater than or equal to 2, and illustratively, the set value may be 3. If yes, the detection circuit is controlled to end the detection operation; if no, the process returns to step S502;

[0102] S508: The processing module issues a warning message.

[0103] The above steps S501 to S508 can be performed by the above detection circuit.

[0104] In the above step S506, the capacitance of the reference capacitor is compared with the warning threshold. When the capacitance of the reference capacitor is greater than the warning threshold, it indicates that the capacitance of the target capacitor is normal; when the capacitance of the reference capacitor is less than the warning threshold, it indicates that there is a risk of failure in the capacitance of the target capacitor. Of course, in some cases, it is also possible to determine whether it is necessary to issue a warning message by determining whether the pulse width of the feedback signal is greater than the set width, whether the time difference between the control signal and the feedback signal is greater than the set time, whether the frequency of the feedback signal is less than the set frequency, etc., and the function of the processing module can be set according to the specific structure of the detection circuit.

[0105] Furthermore, the detection method in the embodiment of the present application may also modify the warning threshold. Specifically, the detection method in the embodiment of the present application may further include:

[0106] S404, the processing module reports sample information to the processor, the sample information including: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times, illustratively, the multiple capacitance values ​​in the sample information may include: the initial power-on value of the reference capacitor, the capacitance value during normal operation, the capacitance value when a fault occurs, etc.;

[0107] S405: The processor modifies the warning threshold according to the sample information, and sends the modified warning threshold to the processing module.

[0108] The above steps S404 and S405 are not shown in the accompanying drawings. In specific implementation, the above steps S404 and S405 can be executed by the above detection system. In the embodiment of the present application, the processor can correct the warning threshold according to the sample information of the reference capacitor, so that the detection circuit can promptly detect the target capacitor with failure risk and prevent the normal target capacitor from being misjudged as having failure risk, thereby improving the warning accuracy and reliability of the detection circuit.

[0109] In one possible implementation, the processor can collect sample information of one or more reference capacitors in the same circuit board, and correct the warning threshold by analyzing the sample information of one or more reference capacitors. In another possible implementation, when the detection system includes multiple circuit boards, the processor can be used to obtain sample information reported by processing modules in multiple circuit boards, correct the warning threshold according to the sample information reported by each circuit board, and send the corrected warning threshold to the processing modules in each circuit board respectively. In this way, the processor can further improve the warning accuracy and reliability of the detection circuit by collecting and analyzing sample information of reference capacitors in multiple circuit boards and correcting the warning threshold.

[0110] In practical applications, the sample information may also include: multiple temperature values ​​corresponding to multiple detections of the reference capacitor. In this way, the processor can correct the warning threshold based on the multiple detection values ​​of the reference capacitor and the corresponding temperature values, further improving the accuracy and reliability of the warning.

[0111] In some embodiments of the present application, in the above step S405, the processor can process the sample information reported by the circuit board, build a data model according to the sample information reported by the circuit board, illustratively, the data model can be a decision tree model, and modify the warning threshold according to the built data model. Specifically, the processor can pre-build a data model based on known capacitance data, the data model can include a fault capacitance range and a non-fault capacitance range, and the boundary between the fault capacitance range and the non-fault capacitance range can be used as the warning threshold. Fig.12 Schematic diagram of the processing flow of the processor in the embodiment of the present application, such as Fig.12 As shown, the processor can process the sample information in the following steps:

[0112] S601, obtaining sample information reported by a processing module in a circuit board;

[0113] S602: Process the sample information reported by the circuit board to generate normalized sample data. For example, data such as capacitance and electric capacity in the sample information may be normalized.

[0114] S603. Determine the fault prediction value of the reference capacitor based on the normalized sample data and the pre-built data model; if the fault prediction value is within the fault capacitor range, determine that the reference capacitor has a fault risk; if the fault prediction value is within the non-fault capacitor range, determine that the reference capacitor has no fault risk.

[0115] In addition, the processor can also update the sample information obtained each time into the data model, and adjust the fault capacitance range and the non-fault capacitance range according to the sample information to adjust the warning threshold, thereby improving the accuracy of the data model. In specific implementation, the processor may include an artificial intelligence (AI) data processing module for running on a server, which can build a data model by using AI data processing, and train and optimize the data model by continuously collecting sample data, which can improve the accuracy of the data model, so as to realize real-time correction of the warning threshold and further improve the accuracy and reliability of the warning.

[0116] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0117] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A capacitance detection circuit, characterized in that: include: A reference capacitor, a detection module and a processing module; The processing module is electrically connected to the reference capacitor, and the processing module is used to send a control signal; The detection module is electrically connected to the reference capacitor, and the detection module is electrically connected to the processing module; the detection module is used to detect the feedback signal of the reference capacitor under the action of the control signal, and send the detection information obtained by the detection to the processing module; The processing module is further used to determine the capacitance of the reference capacitor according to the detection information, compare the capacitance of the reference capacitor with a warning threshold, and issue a warning message when the capacitance of the reference capacitor is less than the warning threshold.

2. The detection circuit according to claim 1, characterized in that: The detection circuit also includes: a trigger module; The trigger module includes a first end and a second end, and the reference capacitor includes a first pole and a second pole; the first end of the trigger module is electrically connected to the processing module, the second end is electrically connected to the first pole of the reference capacitor, and the first pole of the reference capacitor is electrically connected to a first potential; The processing module is specifically used to send a control signal to the first end of the trigger module; The trigger module is used to control the reference capacitor to charge and discharge under the action of the control signal.

3. The detection circuit according to claim 2, characterized in that: The detection module is electrically connected to the first end of the reference capacitor; The detection module is used to detect the pulse width of the feedback signal output by the reference capacitor, and the detection information is used to indicate the pulse width.

4. The detection circuit according to claim 2, characterized in that: The trigger module further includes a third end, and the detection module is electrically connected to the third end of the trigger module; The processing module is specifically configured to send the control signal to the trigger module and the detection module; The reference capacitor is used to output the feedback signal through the third terminal after being charged; The detection module is used to detect a time difference between the control signal and the feedback signal, and the detection information is used to indicate the time difference.

5. The detection circuit according to claim 1, characterized in that: The reference capacitor includes a first electrode and a second electrode; The processing module is electrically connected to the first electrode of the reference capacitor, and the processing module is used to send the control signal to the first electrode to control the reference capacitor to charge and discharge; The detection module is electrically connected to the first electrode of the reference capacitor. The detection module is used to detect the frequency of the feedback signal output by the reference capacitor. The detection information is used to indicate the frequency.

6. The detection circuit according to claim 3 or 5, characterized in that: The detection circuit also includes: a shaping module; The shaping module is electrically connected to the first electrode of the reference capacitor, and the shaping module is electrically connected to the detection module. The shaping module is used to shape the feedback signal and send the shaped feedback signal to the detection module.

7. The detection circuit according to any one of claims 1 to 6, characterized in that: The detection circuit includes at least two reference capacitors connected in parallel, and the detection circuit also includes: a switching module; Each of the reference capacitors in the detection circuit is connected to the detection module via the switching module, and the switching module is used to switch the connection state between each of the reference capacitors and the detection module.

8. The detection circuit according to any one of claims 1 to 7, characterized in that: The processing module is further used to report sample information to the processor and receive the warning threshold sent by the processor to modify the warning threshold; wherein the sample information includes: multiple capacitance values ​​obtained by detecting the reference capacitor multiple times.

9. The detection circuit according to claim 8, characterized in that: The processing module is also used to obtain a temperature value sensed by a temperature sensor; The sample information also includes: detecting multiple temperature values ​​corresponding to the reference capacitor multiple times.

10. A circuit board, characterized in that: include: A functional circuit and a capacitance detection circuit as claimed in any one of claims 1 to 9; The functional circuit includes a target capacitor, and a reference capacitor in the detection circuit is insulated from the target capacitor; the capacitance value of the reference capacitor detected by the detection circuit is used to indicate the capacitance of the target capacitor.

11. A processor, characterized in that: The processor is used to obtain sample information reported by the circuit board, correct the warning threshold according to the sample information, and send the corrected warning threshold to the circuit board; wherein the sample information includes: the capacitance of the reference capacitor obtained by multiple detections.

12. A capacitance detection system, characterized in that: include: The circuit board of claim 10 and the processor of claim 11, wherein the circuit board is electrically connected to the processor.

13. The detection system according to claim 12, characterized in that: The circuit board is used to report sample information to the processor, and the sample information includes: multiple capacitance values ​​obtained by detecting reference capacitance multiple times; The processor is used to modify the early warning threshold according to the sample information, and send the modified early warning threshold to the circuit board.

14. The detection system according to claim 13, characterized in that: The circuit board includes: a temperature sensor, the temperature sensor is used to sense the temperature of the target capacitor; The sample information also includes: detecting multiple temperature values ​​corresponding to the reference capacitor multiple times.

15. The detection system according to claim 13 or 14, characterized in that: The detection system comprises a plurality of the circuit boards; The processor is used to obtain sample information reported by the multiple circuit boards, modify the warning threshold according to the sample information reported by the multiple circuit boards, and send the modified warning threshold to each circuit board respectively.

16. An electronic device, characterized in that: include: The circuit board and housing as claimed in claim 10, wherein the circuit board is located inside the housing.

17. A method for detecting capacitance, characterized in that: include: The processing module sends a control signal; The detection module detects a feedback signal of the reference capacitor under the action of the control signal, and sends the detection information obtained by the detection to the processing module; The processing module determines the capacitance of the reference capacitor according to the detection information, compares the capacitance of the reference capacitor with a warning threshold, and issues a warning message when the capacitance of the reference capacitor is less than the warning threshold.

18. The detection method according to claim 17, characterized in that: The detection method further comprises: The processing module reports sample information to the processor, the sample information including: multiple capacitance values ​​obtained by detecting reference capacitance multiple times; The processor modifies the warning threshold according to the sample information, and sends the modified warning threshold to the processing module.

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