A monitoring method and device for electrolytic capacitors

Abstract

An embodiment of the present application provides a method and device for monitoring an electrolytic capacitor, the method comprising: obtaining the current temperature of any electrolytic capacitor connected to a DC bus in a power supply device; performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters characterizing the fault. Since the temperature of the electrolytic capacitor is closely related to the loss of the electrolytic capacitor, and the loss of the electrolytic capacitor characterizes the fault condition of the electrolytic capacitor, such as the fault type, health status, etc., each electrolytic capacitor can be accurately monitored for faults based on the current temperature of the electrolytic capacitor and the parameters characterizing the fault.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of intelligent control, and in particular to a monitoring method and device for electrolytic capacitors. Background Art

[0002] The DC bus inside the power supply device is connected in parallel with multiple electrolytic capacitors. Electrolytic capacitors are devices with a designed lifespan, and failure of electrolytic capacitors may cause power supply device failure.

[0003] In the related art, the capacity decay rate of the electrolytic capacitor is determined by detecting the current of the electrolytic capacitor, and then the electrolytic capacitor is monitored for faults based on the capacity decay rate of the electrolytic capacitor.

[0004] However, the capacity decay rate of the electrolytic capacitor cannot accurately reflect the fault condition of the electrolytic capacitor. Therefore, the electrolytic capacitor cannot be accurately monitored for faults based on the current of the electrolytic capacitor. Summary of the Invention

[0005] The embodiments of the present application provide a method and device for monitoring an electrolytic capacitor, for accurately monitoring the faults of the electrolytic capacitor.

[0006] In a first aspect, an embodiment of the present application provides a method for monitoring an electrolytic capacitor, the method comprising:

[0007] For any electrolytic capacitor connected to the DC bus in the power supply device, obtaining the current temperature of the electrolytic capacitor;

[0008] The electrolytic capacitor is monitored for faults based on the current temperature of the electrolytic capacitor and parameters characterizing the faults.

[0009] In the above scheme, since the temperature of the electrolytic capacitor is closely related to the loss of the electrolytic capacitor, the loss of the electrolytic capacitor represents the fault condition of the electrolytic capacitor (such as fault type, health status, etc.). Therefore, according to the current temperature of the electrolytic capacitor and the parameters representing the fault, each electrolytic capacitor can be accurately monitored for faults.

[0010] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature and a current temperature of an air inlet of the power supply device;

[0011] Performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and a parameter characterizing the fault includes:

[0012] If the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it is determined that the electrolytic capacitor has failed; or

[0013] If the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than a threshold, it is determined that an open circuit fault occurs in the electrolytic capacitor.

[0014] In the above scheme, since the electrolytic capacitor generates more heat when it fails, if the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it means that the electrolytic capacitor generates too much heat, and the electrolytic capacitor can be determined to have failed more accurately. Since the electrolytic capacitor basically does not generate heat when an open circuit fault occurs, if the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet (i.e., the ambient temperature) is less than the threshold value, it means that the electrolytic capacitor generates less heat, and the electrolytic capacitor can be determined to have an open circuit fault more accurately.

[0015] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature difference and a preset minimum temperature difference;

[0016] Performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and a parameter characterizing the fault includes:

[0017] determining a first temperature difference between a current temperature of the electrolytic capacitor and an average of the current temperatures of all electrolytic capacitors; and determining a difference between the first temperature difference of the electrolytic capacitor and an initial temperature difference of the electrolytic capacitor as a target temperature difference of the electrolytic capacitor;

[0018] If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference value, or if the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference value, it is determined that the health state of the electrolytic capacitor is abnormal.

[0019] In the above scheme, due to the differences in structure and operation of different electrolytic capacitors, the heat generation between different electrolytic capacitors is also different. The first temperature difference of the electrolytic capacitor is adjusted by the initial temperature difference when the electrolytic capacitor is in a good health state to obtain the target temperature difference caused by the health state of the electrolytic capacitor. The target temperature difference represents the difference in heat generation caused by the health state of the electrolytic capacitor compared with other electrolytic capacitors; if the target temperature of the electrolytic capacitor is greater than the preset maximum temperature difference, it means that the electrolytic capacitor generates too much heat compared with other electrolytic capacitors due to the influence of the health state, and the health state of the electrolytic capacitor can be determined more accurately; if the target temperature of the electrolytic capacitor is less than the preset minimum temperature difference, it means that the electrolytic capacitor generates too little heat compared with other electrolytic capacitors due to the influence of the health state, and the health state of the electrolytic capacitor can also be determined more accurately.

[0020] In some optional implementations, the initial temperature difference of the electrolytic capacitor is: the temperature difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors when the power supply device initially operates.

[0021] In the above scheme, since the health status of each electrolytic capacitor is relatively good when the power supply equipment is initially operating, the temperature difference between the initial temperature of any electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors is used as the initial temperature difference of the electrolytic capacitor; based on the initial temperature difference, the first temperature difference of the electrolytic capacitor is adjusted to reduce the interference caused by the differences in the structures and operations of different electrolytic capacitors, and obtain the target temperature difference caused by the health status of the electrolytic capacitor, that is, the target temperature difference represents the difference in heat generation caused by the health status of the electrolytic capacitor compared with other electrolytic capacitors.

[0022] In some optional implementations, the parameter characterizing the fault includes a preset ratio;

[0023] Performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and a parameter characterizing the fault includes:

[0024] determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment;

[0025] Determine a first temperature change of the electrolytic capacitor, a difference between a first temperature change of the electrolytic capacitor and an average value of the first temperature changes of all the electrolytic capacitors, and determine a ratio between the first temperature change difference and the average value of the first temperature changes of all the electrolytic capacitors as a ratio corresponding to the electrolytic capacitor;

[0026] If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0027] In the above scheme, since the temperature of the electrolytic capacitor usually does not increase or decrease too quickly when it is working normally, if the difference rate of the first temperature change of a certain electrolytic capacitor relative to the average value of the first temperature change of all electrolytic capacitors (that is, the ratio of the difference between the first temperature change of the electrolytic capacitor relative to the above average value and the above average value) is greater than the preset ratio, it means that the temperature change of the electrolytic capacitor is significantly different from that of other electrolytic capacitors, thereby more accurately determining that the temperature change of the electrolytic capacitor is abnormal.

[0028] In some optional implementations, determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target duration at a current moment includes:

[0029] determining a second temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the first target time duration;

[0030] The first temperature change of the electrolytic capacitor is obtained by subtracting the third temperature difference and the fourth temperature difference from the second temperature difference; wherein the third temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the first target time at the current moment, and the fourth temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the first target time at the current moment.

[0031] The above scheme determines the second temperature difference between the current temperature of the electrolytic capacitor and the temperature before the first target time at the current moment; subtracts the temperature difference caused by environmental changes (the temperature difference between the current temperature of the air inlet of the power supply equipment and the temperature before the target time) and the temperature difference caused by load changes (the temperature difference between the temperature corresponding to the current load of the power supply equipment and the temperature corresponding to the load before the target time) from the second temperature difference to obtain a first temperature change that is not affected by environmental changes and load changes. Based on the first temperature change, the abnormal temperature change of the electrolytic capacitor can be judged more accurately.

[0032] In some optional implementations, the parameter characterizing the fault includes a preset rate of change;

[0033] Performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and a parameter characterizing the fault includes:

[0034] determining a second temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a second target time at a current moment;

[0035] determining a rate of change of a second temperature change of the electrolytic capacitor relative to a third temperature change of the electrolytic capacitor, wherein the third temperature change is determined based on a temperature of the electrolytic capacitor at a historical moment and a temperature of the electrolytic capacitor before a second target time at the historical moment;

[0036] If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0037] In the above scheme, since the temperature of an electrolytic capacitor usually does not increase or decrease too quickly when it is working normally, if the rate of change of the second temperature change of a certain electrolytic capacitor relative to the third temperature change of the electrolytic capacitor is greater than the preset rate of change, it means that the temperature change of the electrolytic capacitor is significantly different from the previous temperature change, thereby more accurately determining that the temperature change of the electrolytic capacitor is abnormal.

[0038] In a second aspect, an embodiment of the present application further provides a monitoring device for an electrolytic capacitor, comprising:

[0039] A temperature acquisition module is used to obtain the current temperature of any electrolytic capacitor connected to the DC bus in the power supply device;

[0040] The fault monitoring module is used to perform fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters characterizing the fault.

[0041] In a third aspect, an embodiment of the present application provides a computing device comprising at least one processor and at least one memory, wherein the memory stores a computer program, and when the program is executed by the processor, the processor executes the electrolytic capacitor monitoring method described in any one of the first aspects above.

[0042] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program executable by a computing device. When the program runs on the computing device, the computing device executes the electrolytic capacitor monitoring method described in any one of the first aspects above.

[0043] In addition, the technical effects brought about by any implementation method in the second to fourth aspects can refer to the technical effects brought about by different implementation methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A schematic diagram showing the change in capacity decay rate of an electrolytic capacitor over time provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram showing the change in loss of an electrolytic capacitor over time provided in an embodiment of the present application;

[0047] Figure 3Schematic diagram of application scenarios provided by embodiments of the present application;

[0048] Figure 4 A schematic flow chart of a first electrolytic capacitor monitoring method provided in an embodiment of the present application;

[0049] Figure 5 A schematic flow chart of a second electrolytic capacitor monitoring method provided in an embodiment of the present application;

[0050] Figure 6 A schematic flow chart of a third electrolytic capacitor monitoring method provided in an embodiment of the present application;

[0051] Figure 7 A schematic flow chart of a fourth electrolytic capacitor monitoring method provided in an embodiment of the present application;

[0052] Figure 8 A schematic flow chart of a fifth electrolytic capacitor monitoring method provided in an embodiment of the present application;

[0053] Figure 9 A schematic diagram of the structure of a monitoring device for an electrolytic capacitor provided in an embodiment of the present application;

[0054] Figure 10 A schematic diagram of the structure of a computing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0056] The DC bus inside the power supply device is connected in parallel with multiple electrolytic capacitors. Electrolytic capacitors are devices with a designed lifespan, and failure of electrolytic capacitors may cause power supply device failure.

[0057] In the related art, the capacity decay rate of the electrolytic capacitor is determined by detecting the current of the electrolytic capacitor, and then the electrolytic capacitor is monitored for faults based on the capacity decay rate of the electrolytic capacitor.

[0058] See Figure 1As shown, during the normal aging process of electrolytic capacitors, the capacity decay rate does not change significantly (the capacity decay rate variation range is very small), and the detected current itself may have errors, which in turn leads to errors in the capacity decay rate. Since the capacity decay rate variation range is very small, a small error in the capacity decay rate will lead to a misjudgment of the electrolytic capacitor's fault condition. In addition, due to the structural limitations of the power supply equipment, it may not be possible to measure the current of each electrolytic capacitor in the power supply equipment. It is necessary to monitor the fault of the entire group of electrolytic capacitors based on the current of some electrolytic capacitors. Some faulty electrolytic capacitors cannot be detected in time. Therefore, it is difficult to accurately monitor the electrolytic capacitor for faults based on the current of the electrolytic capacitor.

[0059] In view of this, embodiments of the present application provide a method and apparatus for monitoring electrolytic capacitors to accurately monitor electrolytic capacitor faults. The method comprises: obtaining the current temperature of any electrolytic capacitor connected to a DC bus in a power supply device; and performing fault monitoring on the electrolytic capacitor based on the current temperature and parameters indicative of the fault.

[0060] Since the temperature of the electrolytic capacitor is closely related to the loss of the electrolytic capacitor, the loss of the electrolytic capacitor represents the fault condition of the electrolytic capacitor (such as fault type, health status, etc.). Figure 2 As shown in the figure, during the normal aging process, the loss of electrolytic capacitors changes significantly. Even if there is a slight error in the measured temperature, it will not affect the judgment of the fault condition of the electrolytic capacitor. Therefore, according to the current temperature of the electrolytic capacitor and the parameters characterizing the fault, each electrolytic capacitor can be accurately monitored for faults.

[0061] See Figure 3 As shown in FIG. 1 , an application scenario provided by this embodiment includes: a temperature acquisition device ( Figure 3 Eight temperature acquisition devices, namely, temperature acquisition device 110, temperature acquisition device 120, temperature acquisition device 130, temperature acquisition device 140, temperature acquisition device 150, temperature acquisition device 160, temperature acquisition device 170, and temperature acquisition device 180, are used as an example for description, but in actual applications, more or fewer temperature acquisition devices may be provided), a multi-channel temperature measuring instrument 200 supporting cascade connection, and a computing device 300.

[0062] Each temperature acquisition device can send the collected data to the connected multi-channel temperature measuring instrument 200 , and the multi-channel temperature measuring instrument 200 converts the data collected by the temperature acquisition device into a temperature signal and sends it to the computing device 300 .

[0063] Since there are a large number of electrolytic capacitors in the power supply device, the corresponding number of temperature acquisition devices is also large. In some embodiments, different temperature acquisition devices can be connected to different multi-channel temperature measuring instruments, that is, the power supply device converts the collected data into temperature signals through multiple multi-channel temperature measuring instruments and sends them to the computing device 300.

[0064] The computing device 300 can obtain the current temperature of any electrolytic capacitor and can also perform fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters indicating the fault.

[0065] In some embodiments, to facilitate the placement of the temperature acquisition device, the temperature acquisition device may use a temperature detection line, such as a temperature detection line that supports a K-type thermocouple or a negative temperature coefficient resistor, and the temperature detection line is set on the housing of the corresponding electrolytic capacitor to collect data representing the housing temperature of the corresponding electrolytic capacitor through the temperature detection line;

[0066] In some other embodiments, in order for the computing device 300 to subsequently obtain a more realistic temperature of the electrolytic capacitor, the temperature acquisition device is a temperature measuring probe customized inside the electrolytic capacitor to collect data representing the internal temperature of the corresponding electrolytic capacitor.

[0067] The computing device 300 includes one or more groups of servers, and the servers can be of one or more types.

[0068] The above application scenarios are only exemplary descriptions, and the embodiments of the present application are not limited thereto. For example, the number of temperature acquisition devices, the number of multi-channel temperature measuring instruments, and the connection relationship between the temperature acquisition devices and the multi-channel temperature measuring instruments can all be set according to the actual application scenarios.

[0069] The following will be combined with the accompanying drawings and specific embodiments to explain in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0070] The embodiment of the present application provides a first electrolytic capacitor monitoring method, which can be applied to the above-mentioned computing equipment, such as Figure 4 As shown, the following steps are included:

[0071] Step S401: for any electrolytic capacitor connected to a DC bus in a power supply device, obtain the current temperature of the electrolytic capacitor.

[0072] The computing device can receive the temperature of each electrolytic capacitor through the multi-channel temperature measuring instrument and store the received temperature based on a preset time interval and a preset storage rule. The specific receiving method can refer to the above embodiment and will not be repeated here.

[0073] In this embodiment, the current temperature is the temperature measured at the current moment, and the current temperature of the electrolytic capacitor is the temperature of the electrolytic capacitor measured at the current moment.

[0074] Step S402: performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters characterizing the fault.

[0075] Since the temperature of the electrolytic capacitor is closely related to the loss of the electrolytic capacitor, the loss of the electrolytic capacitor represents the fault condition of the electrolytic capacitor (such as fault type, health status, etc.). Therefore, according to the current temperature of the electrolytic capacitor and the parameters representing the fault, each electrolytic capacitor can be accurately monitored for faults.

[0076] In this embodiment, different fault conditions of the electrolytic capacitor can be monitored in different ways based on different parameters representing the fault, which are described below respectively.

[0077] The parameters characterizing the fault include a preset maximum temperature and the current temperature of the air inlet of the power supply device. The embodiment of the present application provides a second electrolytic capacitor monitoring method, which can be applied to the above-mentioned computing device, such as Figure 5 As shown, the following steps are included:

[0078] Step S501: for any electrolytic capacitor connected to a DC bus in a power supply device, obtain the current temperature of the electrolytic capacitor.

[0079] The specific implementation of step S501 can refer to the above embodiment and will not be repeated here.

[0080] Step S502: If the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it is determined that the electrolytic capacitor has failed.

[0081] During implementation, since the electrolytic capacitor generates a lot of heat when it fails, it is necessary to determine whether the current temperature of the electrolytic capacitor is greater than the preset maximum temperature. If the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it means that the electrolytic capacitor generates too much heat, and the failure of the electrolytic capacitor can be determined more accurately.

[0082] The preset maximum temperature value can be set according to the actual application scenario. For example, the preset maximum temperature value is obtained according to the temperature of the electrolytic capacitor in the failed power supply device. In some specific embodiments, the preset maximum temperature value is 75°C.

[0083] Step S503: If the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than a threshold, it is determined that an open circuit fault occurs in the electrolytic capacitor.

[0084] Since the electrolytic capacitor basically does not generate heat when an open circuit fault occurs, it is necessary to determine whether the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than a threshold. If the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than the threshold, it means that the electrolytic capacitor basically does not generate heat, and it can be determined more accurately that the electrolytic capacitor has an open circuit fault.

[0085] In some specific embodiments, the threshold is 0°C, and in other specific embodiments, the threshold may also be 5°C or 2°C. The above thresholds can be set according to actual application scenarios, and will not be given examples one by one here.

[0086] In this embodiment, the computing device needs to obtain the temperature of the air inlet of the power supply device. Based on this, a temperature acquisition device is also provided at the air inlet of the power supply device. The temperature acquisition device can send the collected data to the connected multi-channel temperature measuring instrument. The multi-channel temperature measuring instrument converts the data collected by the temperature acquisition device into a temperature signal and sends it to the computing device. The specific implementation method can refer to the above embodiment and will not be repeated here.

[0087] In the above scheme, since the electrolytic capacitor generates more heat when it fails, if the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it means that the electrolytic capacitor generates too much heat, and the electrolytic capacitor can be determined to have failed more accurately. Since the electrolytic capacitor basically does not generate heat when an open circuit fault occurs, if the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet (i.e., the ambient temperature) is less than the threshold value, it means that the electrolytic capacitor generates less heat, and the electrolytic capacitor can be determined to have an open circuit fault more accurately.

[0088] The parameters characterizing the fault include a preset maximum temperature difference and a preset minimum temperature difference. The embodiment of the present application provides a third electrolytic capacitor monitoring method, which can be applied to the above-mentioned computing device, such as Figure 6 As shown, the following steps are included:

[0089] Step S601: for any electrolytic capacitor connected to a DC bus in a power supply device, obtain the current temperature of the electrolytic capacitor.

[0090] The specific implementation of step S601 can refer to the above embodiment and will not be repeated here.

[0091] Step S602: Determine a first temperature difference between the current temperature of the electrolytic capacitor and an average value of the current temperatures of all electrolytic capacitors.

[0092] Since electrolytic capacitors generate different amounts of heat in different health states, for example, a capacitor in poor health generates significantly different amounts of heat than other electrolytic capacitors, it is necessary to determine a first temperature difference between the current temperature of the electrolytic capacitor and the average current temperature of all electrolytic capacitors.

[0093] Step S603: determining the difference between the first temperature difference of the electrolytic capacitor and the initial temperature difference of the electrolytic capacitor as the target temperature difference of the electrolytic capacitor.

[0094] Due to the differences in structure and operation of different electrolytic capacitors, the heat generation between different electrolytic capacitors is different. Based on this, it is necessary to adjust the first temperature difference based on the initial temperature difference of each electrolytic capacitor when it is in a good health state to obtain the target temperature difference caused by the health state of the electrolytic capacitor.

[0095] In some optional implementations, the initial temperature difference of the electrolytic capacitor is: the temperature difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors when the power supply device initially operates.

[0096] When the power supply equipment is initially operating, the health status of each electrolytic capacitor is relatively good. The temperature difference between the initial temperature of any electrolytic capacitor and the average initial temperature of all electrolytic capacitors is used as the initial temperature difference of the electrolytic capacitor. Based on the initial temperature difference, the first temperature difference of the electrolytic capacitor is adjusted to reduce interference caused by differences in the structures and operations of different electrolytic capacitors, thereby obtaining a target temperature difference caused by the health status of the electrolytic capacitor. That is, the target temperature difference represents the difference in heat generation caused by the health status of the electrolytic capacitor compared with other electrolytic capacitors.

[0097] It can be understood that in this embodiment, the first temperature difference is the difference between the current temperature of the electrolytic capacitor and the average value of the current temperatures of all electrolytic capacitors, which can be a positive number (the current temperature of the electrolytic capacitor is greater than the average value) or a negative number (the current temperature of the electrolytic capacitor is less than the average value); the initial temperature difference is the difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors, which can be a positive number (the initial temperature of the electrolytic capacitor is greater than the average value) or a negative number (the initial temperature of the electrolytic capacitor is less than the average value). Therefore, the target temperature difference of the electrolytic capacitor can also be a positive number or a negative number. If the target temperature difference is a positive number, it means that the electrolytic capacitor produces more heat than other electrolytic capacitors due to the influence of its health status; if the target temperature difference is a negative number, it means that the electrolytic capacitor produces less heat than other electrolytic capacitors due to the influence of its health status.

[0098] Step S604: If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference, or if the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference, it is determined that the health state of the electrolytic capacitor is abnormal.

[0099] As described above, when the health status of an electrolytic capacitor is abnormal, it will generate more or less heat than other electrolytic capacitors. Based on this, the target temperature difference is compared with the preset maximum temperature difference and the preset minimum temperature difference. If the target temperature of the electrolytic capacitor is greater than the preset maximum temperature difference, it means that the electrolytic capacitor generates more heat than other electrolytic capacitors due to the influence of its health status, and the health status of the electrolytic capacitor can be determined more accurately. If the target temperature of the electrolytic capacitor is less than the preset minimum temperature difference, it means that the electrolytic capacitor generates too little heat compared with other electrolytic capacitors due to the influence of its health status, and the health status of the electrolytic capacitor can also be determined more accurately.

[0100] In some specific embodiments, the preset maximum temperature difference is 10°C, and the preset minimum temperature difference is -10°C; in some specific embodiments, the preset maximum temperature difference is 8°C, and the preset minimum temperature difference is -11°C; in some specific embodiments, the preset maximum temperature difference is 12°C, and the preset minimum temperature difference is -10°C. The above-mentioned preset maximum temperature difference and preset minimum temperature difference can be set according to actual application scenarios, and will not be illustrated here one by one.

[0101] In the above scheme, due to the differences in structure and operation of different electrolytic capacitors, the heat generation between different electrolytic capacitors is also different. The first temperature difference of the electrolytic capacitor is adjusted by the initial temperature difference when the electrolytic capacitor is in a good health state to obtain the target temperature difference caused by the health state of the electrolytic capacitor. The target temperature difference represents the difference in heat generation caused by the health state of the electrolytic capacitor compared with other electrolytic capacitors; if the target temperature of the electrolytic capacitor is greater than the preset maximum temperature difference, it means that the electrolytic capacitor generates too much heat compared with other electrolytic capacitors due to the influence of the health state, and the health state of the electrolytic capacitor can be determined more accurately; if the target temperature of the electrolytic capacitor is less than the preset minimum temperature difference, it means that the electrolytic capacitor generates too little heat compared with other electrolytic capacitors due to the influence of the health state, and the health state of the electrolytic capacitor can also be determined more accurately.

[0102] In view of the fact that the parameters characterizing the fault include a preset ratio, the embodiment of the present application provides a fourth method for monitoring an electrolytic capacitor, which can be applied to the above-mentioned computing device, such as Figure 7 As shown, the following steps are included:

[0103] Step S701: for any electrolytic capacitor connected to a DC bus in a power supply device, obtain the current temperature of the electrolytic capacitor.

[0104] The specific implementation of step S701 can refer to the above embodiment and will not be repeated here.

[0105] Step S702: determining a first temperature change of the electrolytic capacitor based on the current temperature of the electrolytic capacitor and the temperature of the electrolytic capacitor before the first target time at the current moment.

[0106] Since the temperature of an electrolytic capacitor generally does not increase or decrease too quickly when the capacitor is operating normally, it is necessary to determine whether the temperature change (increase or decrease) of the electrolytic capacitor is abnormal.

[0107] If the temperature change of a certain electrolytic capacitor over a period of time is significantly different from the temperature change of other electrolytic capacitors during this period, it means that the temperature change of the electrolytic capacitor is abnormal relative to the other electrolytic capacitors. Therefore, it is necessary to first determine the temperature change of the electrolytic capacitor over a period of time. Based on the current temperature of the electrolytic capacitor (as described above, the current temperature of the electrolytic capacitor is the temperature of the electrolytic capacitor measured at the current moment) and the temperature before the first target duration at the current moment, the first temperature change of the electrolytic capacitor within the first target duration can be determined.

[0108] During implementation, the first target duration may be set according to actual application scenarios, such as one month.

[0109] The temperature change directly obtained based on the current temperature of the electrolytic capacitor and the temperature before the first target duration at the current moment is not only affected by the fault condition of the electrolytic capacitor itself, but also by environmental changes and load changes. For example, a rise in ambient temperature will cause the temperature of the electrolytic capacitor to increase, and an increase in the load of the power supply device will also cause the temperature of the electrolytic capacitor to increase. Based on this, in some optional embodiments, the first temperature change of the electrolytic capacitor can be determined by the following method:

[0110] determining a second temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the first target time duration;

[0111] The first temperature change of the electrolytic capacitor is obtained by subtracting the third temperature difference and the fourth temperature difference from the second temperature difference; wherein the third temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the first target time at the current moment, and the fourth temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the first target time at the current moment.

[0112] Exemplarily, the current temperature of the electrolytic capacitor is subtracted from the temperature before the first target time at the current moment to obtain the second temperature difference; the current temperature of the air inlet of the power supply device is subtracted from the temperature before the target time to obtain the third temperature difference (the method for obtaining the temperature of the air inlet of the power supply device can refer to the above embodiment and will not be repeated here); the temperature corresponding to the current load of the power supply device is subtracted from the temperature corresponding to the load before the target time to obtain the fourth temperature difference. The load of the power supply device can be determined based on the temperature difference between the temperature of the air outlet of the power supply device and the temperature of the air inlet, and the temperature corresponding to the load can be determined based on the preset correspondence between the load and the temperature. After obtaining the second temperature difference, the third temperature difference, and the fourth temperature difference, the second temperature difference is subtracted from the third temperature difference and the fourth temperature difference to obtain the first temperature change of the electrolytic capacitor.

[0113] It can be understood that the second temperature difference, the third temperature difference and the fourth temperature difference can be positive or negative, so the first temperature change can also be positive or negative.

[0114] By determining the second temperature difference between the current temperature of the electrolytic capacitor and the temperature before the first target time at the current moment; subtracting the temperature difference caused by environmental changes (the temperature difference between the current temperature of the air inlet of the power supply equipment and the temperature before the target time) and the temperature difference caused by load changes (the temperature difference between the temperature corresponding to the current load of the power supply equipment and the temperature corresponding to the load before the target time) from the second temperature difference, a first temperature change amount that is not affected by environmental changes and load changes is obtained, and then based on the first temperature change amount, the temperature change abnormality of the electrolytic capacitor can be judged more accurately.

[0115] Step S703: Determine the first temperature change of the electrolytic capacitor, the difference in change relative to the average value of the first temperature change of all electrolytic capacitors, and determine the ratio between the difference in change and the average value of the first temperature change of all electrolytic capacitors as the ratio corresponding to the electrolytic capacitor.

[0116] As described above, if the temperature change of a certain electrolytic capacitor over a period of time is significantly different from the temperature change of other electrolytic capacitors during this period, it indicates that the temperature change of the electrolytic capacitor is abnormal relative to other electrolytic capacitors. After determining the first temperature change of each electrolytic capacitor within the first target time, it is also necessary to determine whether the first temperature change of each electrolytic capacitor is significantly different from the average value of the first temperature change of all electrolytic capacitors.

[0117] Exemplarily, the difference in the first temperature change of the electrolytic capacitor relative to the average value of the first temperature change of all electrolytic capacitors characterizes the difference in temperature change between the electrolytic capacitor and other electrolytic capacitors during the first target time; the ratio between the difference in the change and the average value of the first temperature change of all electrolytic capacitors characterizes the difference in the first temperature change of the electrolytic capacitor relative to the average value of the first temperature change of all electrolytic capacitors.

[0118] It can be understood that the first temperature change of a certain electrolytic capacitor can be a positive number or a negative number, and the average value of the first temperature change of all electrolytic capacitors can be a positive number or a negative number. However, the above-mentioned difference in the change amount represents the difference in temperature change between the electrolytic capacitor and other electrolytic capacitors during the first target time, and can be indistinguishable between positive and negative. Regardless of whether the difference in the change amount is a larger positive number or a smaller negative number, it indicates that the temperature change of the electrolytic capacitor and other electrolytic capacitors during the first target time is significantly different.

[0119] Step S704: If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0120] As mentioned above, if the temperature change of a certain electrolytic capacitor over a period of time is significantly different from the temperature change of other electrolytic capacitors during that period, it indicates that the temperature change of the electrolytic capacitor is abnormal relative to the other electrolytic capacitors. The corresponding ratio of the electrolytic capacitor represents the difference between the first temperature change of the electrolytic capacitor during the first target time and the average value of the first temperature change of all electrolytic capacitors during the first target time. Based on this, by comparing the corresponding ratio of the electrolytic capacitor with the preset ratio, if the corresponding ratio of the electrolytic capacitor is greater than the preset ratio, it indicates that the temperature change of the electrolytic capacitor is significantly different from that of the other electrolytic capacitors, and the abnormal temperature change of the electrolytic capacitor can be determined more accurately.

[0121] In some specific embodiments, the preset ratio is 1 / 5 (i.e., 20%); in some specific embodiments, the preset ratio is 1 / 4 (i.e., 25%); in some specific embodiments, the preset ratio is 3 / 8 (i.e., 37.5%); the above preset ratios can be set according to actual application scenarios, and will not be explained one by one here.

[0122] In the above scheme, since the temperature of the electrolytic capacitor usually does not increase or decrease too quickly when it is working normally, if the difference rate of the first temperature change of a certain electrolytic capacitor relative to the average value of the first temperature change of all electrolytic capacitors (that is, the ratio of the difference between the first temperature change of the electrolytic capacitor relative to the above average value and the above average value) is greater than the preset ratio, it means that the temperature change of the electrolytic capacitor is significantly different from that of other electrolytic capacitors, thereby more accurately determining that the temperature change of the electrolytic capacitor is abnormal.

[0123] In view of the fact that the parameter characterizing the fault includes a preset change rate, the embodiment of the present application provides a fifth method for monitoring an electrolytic capacitor, which can be applied to the above-mentioned computing device, such as Figure 8 As shown, the following steps are included:

[0124] Step S801: for any electrolytic capacitor connected to a DC bus in a power supply device, obtain the current temperature of the electrolytic capacitor.

[0125] The specific implementation of step S801 can refer to the above embodiment and will not be repeated here.

[0126] Step S802: determining a second temperature change of the electrolytic capacitor based on the current temperature of the electrolytic capacitor and the temperature of the electrolytic capacitor before the second target time at the current moment.

[0127] Since the temperature of an electrolytic capacitor generally does not increase or decrease too quickly when the capacitor is operating normally, it is necessary to determine whether the temperature change (increase or decrease) of the electrolytic capacitor is abnormal.

[0128] If the temperature change of an electrolytic capacitor over a period of time differs significantly from its previous temperature change, it indicates that the electrolytic capacitor has experienced an abnormal temperature change compared to the previous temperature change. Therefore, it is necessary to first determine the temperature change of the electrolytic capacitor over a period of time. Based on the current temperature of the electrolytic capacitor and its temperature before the second target time period at the current moment, the second temperature change of the electrolytic capacitor within the second target time period can be determined.

[0129] During implementation, the second target duration can be set according to the actual application scenario, such as three months.

[0130] In this embodiment, the second temperature change of the electrolytic capacitor can be determined by the following method:

[0131] determining a fifth temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the second target time duration;

[0132] The second temperature change of the electrolytic capacitor is obtained by subtracting the sixth temperature difference and the seventh temperature difference from the fifth temperature difference; wherein the sixth temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the second target time at the current moment, and the seventh temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the second target time at the current moment.

[0133] The second temperature variation that is not affected by environmental changes or load changes is obtained in the above manner. The implementation method for determining the second temperature variation of the electrolytic capacitor is similar to the implementation method for determining the first temperature variation of the electrolytic capacitor. The specific implementation method can refer to the above embodiment.

[0134] Step S803: determining a rate of change of the second temperature change of the electrolytic capacitor relative to the third temperature change of the electrolytic capacitor.

[0135] The third temperature change is determined based on the temperature of the electrolytic capacitor at a historical moment and the temperature of the electrolytic capacitor before the second target time at the historical moment.

[0136] As described above, if the temperature change of a certain electrolytic capacitor over a period of time is significantly different from the temperature change before the electrolytic capacitor, it means that the temperature change of the electrolytic capacitor is abnormal compared to the previous temperature change. After determining the second temperature change of each electrolytic capacitor within the second target time, it is also necessary to determine whether the second temperature change of each electrolytic capacitor is significantly different from the third temperature change before the electrolytic capacitor.

[0137] Exemplarily, the difference between the second temperature change of the electrolytic capacitor and the third temperature change represents the difference in temperature change of the electrolytic capacitor within the two second target time periods; the ratio between the difference and the third temperature change represents the change in the second temperature change of the electrolytic capacitor relative to the third temperature change.

[0138] The historical moment is the moment corresponding to the third target duration before the current moment. The third target duration can be set according to the actual application scenario, such as one month, two months, three months, etc.

[0139] It can be understood that the second temperature change of a certain electrolytic capacitor can be a positive number or a negative number, and the third temperature change can also be a positive number or a negative number, but the above difference represents the difference in temperature change of the electrolytic capacitor within the two second target time periods, and can be indistinguishable between positive and negative. Regardless of whether the difference is a larger positive number or a smaller negative number, it indicates that the difference in temperature change of the electrolytic capacitor within the two second target time periods is large.

[0140] In this embodiment, the third temperature change of the electrolytic capacitor can be determined by the following method:

[0141] determining an eighth temperature difference between the temperature of the electrolytic capacitor at the historical moment and the temperature of the electrolytic capacitor a second target time period before the historical moment;

[0142] The third temperature change of the electrolytic capacitor is obtained by subtracting the ninth temperature difference and the tenth temperature difference from the eighth temperature difference; wherein the ninth temperature difference is the temperature difference between the temperature of the air inlet of the power supply device at the historical moment and the temperature of the air inlet before the second target time at the historical moment, and the tenth temperature difference is the temperature difference between the temperature corresponding to the load of the power supply device at the historical moment and the temperature corresponding to the load of the power supply device before the second target time at the historical moment.

[0143] The third temperature variation that is not affected by environmental changes or load changes is obtained in the above manner. The implementation method for determining the third temperature variation of the electrolytic capacitor is similar to the implementation method for determining the first temperature variation of the electrolytic capacitor. The specific implementation method can refer to the above embodiment.

[0144] Step S804: If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0145] As mentioned above, if the temperature change of an electrolytic capacitor over a period of time is significantly different from the previous temperature change of the electrolytic capacitor, it indicates that the temperature change of the electrolytic capacitor is abnormal compared to the previous temperature change; the corresponding change rate of the electrolytic capacitor represents the change of the current second temperature change of the electrolytic capacitor relative to the previous third temperature change. Based on this, by comparing the corresponding change rate of the electrolytic capacitor with the preset change rate, if the corresponding change rate of the electrolytic capacitor is greater than the preset change rate, it indicates that the temperature change of the electrolytic capacitor is significantly different from the previous temperature change, and the abnormal temperature change of the electrolytic capacitor can be determined more accurately.

[0146] In some specific embodiments, the preset change rate is 50% (i.e., 1 / 2); in some specific embodiments, the preset change rate is 40% (i.e., 2 / 5); in some specific embodiments, the preset change rate is 60% (i.e., 3 / 5). The above preset change rates can be set according to actual application scenarios and will not be given as examples here.

[0147] In the above scheme, since the temperature of an electrolytic capacitor usually does not increase or decrease too quickly when it is working normally, if the rate of change of the second temperature change of a certain electrolytic capacitor relative to the third temperature change of the electrolytic capacitor is greater than the preset rate of change, it means that the temperature change of the electrolytic capacitor is significantly different from the previous temperature change, thereby more accurately determining that the temperature change of the electrolytic capacitor is abnormal.

[0148] In some optional embodiments, after determining that the electrolytic capacitor has failed, has an open circuit fault, is in an abnormal health state, or has an abnormal temperature change, the computing device can notify the electrolytic capacitor of the failure through a preset notification method. For example, when a certain electrolytic capacitor fails, a notification message carrying the electrolytic capacitor identification and information indicating the failure is sent to a preset person; or, the electrolytic capacitor identification and information indicating the failure are displayed on the display screen of the computing device.

[0149] In addition, the computing device may execute the electrolytic capacitor monitoring method in response to a user instruction, or may execute the electrolytic capacitor monitoring method once every set time period.

[0150] Based on the same inventive concept, the present application provides a monitoring device for electrolytic capacitors, see Figure 9 As shown, the monitoring device 900 for electrolytic capacitors includes:

[0151] A temperature obtaining module 901 is configured to obtain the current temperature of any electrolytic capacitor connected to a DC bus in a power supply device;

[0152] The fault monitoring module 902 is configured to perform fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters characterizing the fault.

[0153] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature and a current temperature of an air inlet of the power supply device;

[0154] The fault monitoring module 902 is specifically configured to:

[0155] If the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it is determined that the electrolytic capacitor has failed; or

[0156] If the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than a threshold, it is determined that an open circuit fault occurs in the electrolytic capacitor.

[0157] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature difference and a preset minimum temperature difference;

[0158] The fault monitoring module 902 is specifically configured to:

[0159] determining a first temperature difference between a current temperature of the electrolytic capacitor and an average of the current temperatures of all electrolytic capacitors; and determining a difference between the first temperature difference of the electrolytic capacitor and an initial temperature difference of the electrolytic capacitor as a target temperature difference of the electrolytic capacitor;

[0160] If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference value, or if the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference value, it is determined that the health state of the electrolytic capacitor is abnormal.

[0161] In some optional implementations, the initial temperature difference of the electrolytic capacitor is: the temperature difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors when the power supply device initially operates.

[0162] In some optional implementations, the parameter characterizing the fault includes a preset ratio;

[0163] The fault monitoring module 902 is specifically configured to:

[0164] determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment;

[0165] Determine a first temperature change of the electrolytic capacitor, a difference between a first temperature change of the electrolytic capacitor and an average value of the first temperature changes of all the electrolytic capacitors, and determine a ratio between the first temperature change difference and the average value of the first temperature changes of all the electrolytic capacitors as a ratio corresponding to the electrolytic capacitor;

[0166] If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0167] In some optional implementations, the fault monitoring module 902 is specifically configured to:

[0168] determining a second temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the first target time duration;

[0169] The first temperature change of the electrolytic capacitor is obtained by subtracting the third temperature difference and the fourth temperature difference from the second temperature difference; wherein the third temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the first target time at the current moment, and the fourth temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the first target time at the current moment.

[0170] In some optional implementations, the parameter characterizing the fault includes a preset rate of change;

[0171] The fault monitoring module 902 is specifically configured to:

[0172] determining a second temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a second target time at a current moment;

[0173] determining a rate of change of a second temperature change of the electrolytic capacitor relative to a third temperature change of the electrolytic capacitor, wherein the third temperature change is determined based on a temperature of the electrolytic capacitor at a historical moment and a temperature of the electrolytic capacitor before a second target time at the historical moment;

[0174] If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0175] Since the device is the device in the method in the embodiment of the present application, and the principle of solving the problem by the device is similar to that of the method, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0176] Based on the same technical concept, the embodiment of the present application also provides a computing device 1000, such as Figure 10 As shown, it includes at least one processor 1001 and a memory 1002 connected to the at least one processor. The specific connection medium between the processor 1001 and the memory 1002 is not limited in the embodiment of the present application. Figure 10 For example, the processor 1001 and the memory 1002 are connected via a bus 1003. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0177] Among them, the processor 1001 is the control center of the computing device. It can use various interfaces and lines to connect various parts of the computing device, and realize data processing by running or executing instructions stored in the memory 1002 and calling data stored in the memory 1002. Optionally, the processor 1001 may include one or more processing units. The processor 1001 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes the issuance of instructions. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1001. In some embodiments, the processor 1001 and the memory 1002 may be implemented on the same chip. In some embodiments, they may also be implemented on separate chips.

[0178] The processor 1001 can be a general-purpose processor, such as a central processing unit (CPU), a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiment of the method for monitoring an electrolytic capacitor can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor.

[0179] Memory 1002 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules. Memory 1002 may include at least one type of storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory, a random access memory (Random Access Memory, RAM), a static random access memory (Static Random Access Memory, SRAM), a programmable read-only memory (Programmable Read Only Memory, PROM), a read-only memory (Read Only Memory, ROM), an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a magnetic memory, a disk, an optical disk, etc. Memory 1002 is any other medium that can be used to carry or store a desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory 1002 in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0180] In the embodiment of the present application, the memory 1002 stores a computer program. When the program is executed by the processor 1001, the processor 1001 executes:

[0181] For any electrolytic capacitor connected to the DC bus in the power supply device, obtaining the current temperature of the electrolytic capacitor;

[0182] The electrolytic capacitor is monitored for faults based on the current temperature of the electrolytic capacitor and parameters characterizing the faults.

[0183] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature and a current temperature of an air inlet of the power supply device;

[0184] The processor 1001 specifically performs:

[0185] If the current temperature of the electrolytic capacitor is greater than the preset maximum temperature, it is determined that the electrolytic capacitor has failed; or

[0186] If the temperature difference between the current temperature of the electrolytic capacitor and the current temperature of the air inlet is less than a threshold, it is determined that an open circuit fault occurs in the electrolytic capacitor.

[0187] In some optional implementations, the parameter characterizing the fault includes a preset maximum temperature difference and a preset minimum temperature difference;

[0188] The processor 1001 specifically performs:

[0189] determining a first temperature difference between a current temperature of the electrolytic capacitor and an average of the current temperatures of all electrolytic capacitors; and determining a difference between the first temperature difference of the electrolytic capacitor and an initial temperature difference of the electrolytic capacitor as a target temperature difference of the electrolytic capacitor;

[0190] If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference value, or if the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference value, it is determined that the health state of the electrolytic capacitor is abnormal.

[0191] In some optional implementations, the initial temperature difference of the electrolytic capacitor is: the temperature difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors when the power supply device initially operates.

[0192] In some optional implementations, the parameter characterizing the fault includes a preset ratio;

[0193] The processor 1001 specifically performs:

[0194] determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment;

[0195] Determine a first temperature change of the electrolytic capacitor, a difference between a first temperature change of the electrolytic capacitor and an average value of the first temperature changes of all the electrolytic capacitors, and determine a ratio between the first temperature change difference and the average value of the first temperature changes of all the electrolytic capacitors as a ratio corresponding to the electrolytic capacitor;

[0196] If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0197] In some optional implementations, the processor 1001 specifically performs:

[0198] determining a second temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the first target time duration;

[0199] The first temperature change of the electrolytic capacitor is obtained by subtracting the third temperature difference and the fourth temperature difference from the second temperature difference; wherein the third temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the first target time at the current moment, and the fourth temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the first target time at the current moment.

[0200] In some optional implementations, the parameter characterizing the fault includes a preset rate of change;

[0201] The processor 1001 specifically performs:

[0202] determining a second temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a second target time at a current moment;

[0203] determining a rate of change of a second temperature change of the electrolytic capacitor relative to a third temperature change of the electrolytic capacitor, wherein the third temperature change is determined based on a temperature of the electrolytic capacitor at a historical moment and a temperature of the electrolytic capacitor before a second target time at the historical moment;

[0204] If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

[0205] Since the computing device is the computing device in the method in the embodiment of the present application, and the principle of solving the problem by the computing device is similar to that of the method, the implementation of the computing device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0206] Based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer program that can be executed by a computing device. When the program runs on the computing device, the computing device executes the steps of the above-mentioned electrolytic capacitor monitoring method.

[0207] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0208] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0209] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0210] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0211] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional 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 that fall within the scope of the present application.

[0212] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for monitoring an electrolytic capacitor, characterized in that: The method includes: For any electrolytic capacitor connected to the DC bus in the power supply device, obtaining the current temperature of the electrolytic capacitor; Performing fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and a parameter characterizing the fault; The parameter characterizing the fault includes a preset maximum temperature difference and a preset minimum temperature difference. Based on the current temperature of the electrolytic capacitor and the parameter characterizing the fault, the electrolytic capacitor is subjected to fault monitoring, including: Determining a first temperature difference between a current temperature of the electrolytic capacitor and an average of the current temperatures of all electrolytic capacitors; determining a difference between the first temperature difference of the electrolytic capacitor and an initial temperature difference of the electrolytic capacitor as a target temperature difference of the electrolytic capacitor; If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference value, or the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference value, then it is determined that the health state of the electrolytic capacitor is abnormal; or The parameter characterizing the fault includes a preset ratio, and fault monitoring of the electrolytic capacitor is performed based on the current temperature of the electrolytic capacitor and the parameter characterizing the fault, including: determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment; Determine a first temperature change of the electrolytic capacitor, a difference between a first temperature change of the electrolytic capacitor and an average value of the first temperature changes of all the electrolytic capacitors, and determine a ratio between the first temperature change difference and the average value of the first temperature changes of all the electrolytic capacitors as a ratio corresponding to the electrolytic capacitor; If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, it is determined that the temperature change of the electrolytic capacitor is abnormal; or The parameter characterizing the fault includes a preset change rate, and fault monitoring of the electrolytic capacitor is performed based on the current temperature of the electrolytic capacitor and the parameter characterizing the fault, including: determining a second temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a second target time at a current moment; determining a rate of change of a second temperature change of the electrolytic capacitor relative to a third temperature change of the electrolytic capacitor, wherein the third temperature change is determined based on a temperature of the electrolytic capacitor at a historical moment and a temperature of the electrolytic capacitor before a second target time at the historical moment; If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

2. The method according to claim 1, wherein The initial temperature difference of the electrolytic capacitor is: the temperature difference between the initial temperature of the electrolytic capacitor and the average value of the initial temperatures of all electrolytic capacitors when the power supply device is initially working.

3. The method according to claim 1, wherein In a case where the parameter characterizing the fault includes a preset ratio, determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment includes: determining a second temperature difference between a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor at a current moment before the first target time duration; The first temperature change of the electrolytic capacitor is obtained by subtracting the third temperature difference and the fourth temperature difference from the second temperature difference; wherein the third temperature difference is the temperature difference between the current temperature of the air inlet of the power supply device and the temperature of the air inlet before the first target time at the current moment, and the fourth temperature difference is the temperature difference between the temperature corresponding to the current load of the power supply device and the temperature corresponding to the load of the power supply device before the first target time at the current moment.

4. A monitoring device for an electrolytic capacitor, characterized in that: include: A temperature acquisition module is used to obtain the current temperature of any electrolytic capacitor connected to the DC bus in the power supply device; a fault monitoring module, configured to perform fault monitoring on the electrolytic capacitor based on the current temperature of the electrolytic capacitor and parameters characterizing the fault; The parameters characterizing the fault include a preset maximum temperature difference and a preset minimum temperature difference. The fault monitoring module is specifically configured to: determining a first temperature difference between a current temperature of the electrolytic capacitor and an average of the current temperatures of all electrolytic capacitors; determining a difference between the first temperature difference of the electrolytic capacitor and the initial temperature difference of the electrolytic capacitor as a target temperature difference of the electrolytic capacitor; If the target temperature difference of the electrolytic capacitor is greater than the preset maximum temperature difference value, or the target temperature difference of the electrolytic capacitor is less than the preset minimum temperature difference value, determining that the health state of the electrolytic capacitor is abnormal; or The parameter characterizing the fault includes a preset ratio, and the fault monitoring module is specifically configured to: determining a first temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a first target time at a current moment; Determine a first temperature change of the electrolytic capacitor, a difference between a first temperature change of the electrolytic capacitor and an average value of the first temperature changes of all the electrolytic capacitors, and determine a ratio between the first temperature change difference and the average value of the first temperature changes of all the electrolytic capacitors as a ratio corresponding to the electrolytic capacitor; If the ratio corresponding to the electrolytic capacitor is greater than the preset ratio, determining that the temperature change of the electrolytic capacitor is abnormal; or The parameter characterizing the fault includes a preset change rate, and the fault monitoring module is specifically configured to: determining a second temperature change of the electrolytic capacitor based on a current temperature of the electrolytic capacitor and a temperature of the electrolytic capacitor before a second target time at a current moment; determining a rate of change of a second temperature change of the electrolytic capacitor relative to a third temperature change of the electrolytic capacitor, wherein the third temperature change is determined based on a temperature of the electrolytic capacitor at a historical moment and a temperature of the electrolytic capacitor before a second target time at the historical moment; If the change rate corresponding to the electrolytic capacitor is greater than the preset change rate, it is determined that the temperature change of the electrolytic capacitor is abnormal.

5. A computing device, characterized in that The method comprises at least one processor and at least one memory, wherein the memory stores a computer program, and when the program is executed by the processor, the processor executes the method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that It stores a computer program executable by a computing device, and when the program is run on the computing device, the computing device is caused to execute the method according to any one of claims 1 to 3.

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