Ripple voltage deterioration state detection method and system of electric power supply module

Abstract

The invention discloses a ripple voltage degradation state detection method and system of an electric power supply module, and relates to the technical field of electric variable measurement. The ripple voltage degradation state detection method of the electric power supply module comprises the following steps: acquiring monitoring data of the electric power supply module; obtaining an output current quality evaluation coefficient based on the monitoring data; obtaining a difference factor of the output current based on the actual output current of the electric power supply module and the change of the corresponding ripple voltage; and based on the output current quality evaluation coefficient and the difference factor of the output current, obtaining a degradation state index of the power supply module. Compared with the prior art, the method has the advantages that the hysteresis is small, and the evaluation result can be more accurate through superposition evaluation of multiple factors.

Description

Technical Field

[0001] The present application relates to the technical field of electrical variable measurement, and specifically to a method and system for detecting a ripple voltage degradation state of an electric power supply module. Background Art

[0002] The power high-frequency switching power supply module is one of the important core components of electronic equipment. Ripple voltage is an important technical indicator of the DC system. The high-frequency sound waves, electromagnetic waves, thermal fluctuations, etc. generated by the ripple voltage will interfere with electronic equipment and affect the reliability and performance of the equipment. For example, it has a great impact on computers, communication circuits, protection devices, precision testing instruments, etc., which may cause them to fail to work properly.

[0003] Large ripple voltage will lead to energy waste and affect system efficiency. Because ripple voltage will cause additional loss in capacitors, so that energy returns to the power supply, thus wasting part of the electric energy. In circuits where power conversion efficiency is important, the impact of ripple voltage may cause equipment efficiency to decrease, reducing the efficiency of the system. Ripple voltage will have an impact on the circuit. Circuits with poor stability will lead to increased instrument errors, system instability, and unreliable equipment. It is easy to generate undesirable harmonics in the equipment in use, and harmonics will cause more harm; strong ripples will cause surge voltage or current, resulting in burning of electrical equipment; it will interfere with the logical relationship of digital circuits and affect their normal operation; it will cause noise interference, making image equipment and audio equipment unable to work normally.

[0004] At present, the general method for detecting and screening the ripple voltage of power supply modules is to monitor the actual output ripple voltage value at the output end of the power supply. It is impossible to continuously and automatically observe, continuously and scientifically analyze, and continuously detect the size of the ripple voltage to evaluate the module status. Summary of the invention

[0005] The purpose of the present application is to provide a method and system for detecting the ripple voltage degradation state of an electric power module, so as to solve the technical problem that the ripple voltage degradation state detection method of the electric power module in the prior art has hysteresis.

[0006] To achieve the above objectives, this application provides the following technical solutions: In a first aspect, the present application proposes a method for detecting a ripple voltage degradation state of an electric power module, the method for detecting a ripple voltage degradation state of an electric power module comprising: Acquire monitoring data of the power supply module; the monitoring data includes timing data of output voltage, ripple voltage and temperature at the output end of the power supply module; Based on the monitoring data, obtaining an output current quality assessment coefficient; Based on the actual output current of the power supply module and the change of the corresponding ripple voltage, a difference factor of the output current is obtained; Based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the electric power module is obtained; the degradation state indicator is at least used to characterize the reliability of the electric power module.

[0007] As a specific solution in the technical solution of the present application, the obtaining of the output current quality evaluation coefficient based on the monitoring data includes: Based on the monitoring data, acquiring time series data of the output voltage and the ripple voltage; Based on the time series data of the output voltage, first data is acquired; the first data is any data in the time series data of the output voltage; Based on the timing data of the ripple voltage, obtaining second data; the timing of the second data is the same as the timing of the first data; Based on the first data and the second data, a ripple voltage occupancy rate corresponding to the power supply module is acquired; the ripple voltage occupancy rate is at least used to characterize the synchronization of the output voltage and the ripple voltage change; Based on the ripple voltage occupancy rate, the output current quality assessment coefficient is obtained.

[0008] As a specific solution in the technical solution of the present application, the calculation formula for obtaining the ripple voltage occupancy rate corresponding to the power supply module based on the first data and the second data is as follows: in, represents the ripple voltage occupancy rate corresponding to the i-th sequential power supply module; Represents the output voltage value of the i-th time sequence; Indicates the ripple voltage value of the i-th time sequence; Indicates the minimum value of the output voltage in each timing sequence; Indicates the minimum value of the ripple voltage in each timing sequence; Expressed as a constant greater than 0; Represents a normalization function, which is used to map the values ​​in the brackets to the interval (0, 1).

[0009] As a specific solution in the technical solution of the present application, the step of obtaining the output current quality evaluation coefficient based on the ripple voltage occupancy rate includes: Based on the ripple voltage occupancy rate, a third coefficient, a fourth coefficient and a fifth coefficient are obtained; the third coefficient and the fourth coefficient are two ripple voltage occupancy rates adjacent to each other in any time sequence; the fifth coefficient is an average value of the ripple voltage occupancy rates corresponding to multiple time sequences; Obtaining a standard coefficient; the standard coefficient is preset; Based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, an output current stability coefficient of the power supply module is obtained; the output current stability coefficient of the power supply module is at least used to characterize the discrete degree of the ripple voltage occupancy rate of each time sequence; The output current quality assessment coefficient is obtained based on the output current stability coefficient of the power supply module.

[0010] As a specific solution in the technical solution of the present application, the calculation formula for obtaining the output current stability coefficient of the power supply module based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient is as follows: in, Indicates the output current stability coefficient of the power supply module; N represents the timing number, which is a positive integer greater than or equal to 2; Indicates the ripple voltage occupancy rate corresponding to the kth sequential power supply module; Indicates the ripple voltage occupancy rate corresponding to the k+1th sequential power supply module; Indicates the absolute value. Indicates the average value of the ripple voltage occupancy rate of N time sequences; Represents the standard coefficient.

[0011] As a specific solution in the technical solution of the present application, the step of obtaining the output current quality evaluation coefficient based on the output current stability coefficient of the power supply module includes: Obtaining a set current value of the power supply module; The output current quality evaluation coefficient is obtained based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module.

[0012] As a specific solution in the technical solution of the present application, the calculation formula for obtaining the output current quality evaluation coefficient based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module is as follows: Wherein, V represents the output current quality assessment coefficient; Indicates the total number of time series; Indicates the output current value of the kth time sequence; Indicates the set current value of the power supply module; Represents the output current stability coefficient, output current quality assessment coefficient, and output current stability coefficient of the power supply module corresponding to the power supply module.

[0013] As a specific solution in the technical solution of the present application, the difference factor of the output current is obtained based on the change of the actual output current of the power supply module and the corresponding ripple voltage, including: Obtaining a first characteristic value based on a difference between an upper limit of an actual output current of the power supply module and an upper limit of a rated current, and obtaining a second characteristic value based on a difference between a lower limit of an actual output current of the power supply module and a lower limit of a rated current; A difference factor of an output current is obtained based on the first characteristic value and the second characteristic value.

[0014] As a specific solution in the technical solution of the present application, the calculation formula for obtaining the degradation state index of the power supply module based on the output current quality evaluation coefficient and the output current difference factor is as follows: in, Indicator indicating the degradation status of the power supply module; represents a normalization function, which is used to map the value in the brackets to the interval (0, 1); V represents the output current quality evaluation coefficient corresponding to the power supply module, Indicates the lower limit of the actual output current of the power supply module, represents the upper limit of the actual output current of the power supply module, Indicates the lower limit of the rated current, Indicates the upper limit of the rated current, represents the first eigenvalue, represents the second eigenvalue, Indicates the difference factor of the output current corresponding to the power supply module.

[0015] In a second aspect, the present application proposes a ripple voltage degradation state detection system for an electric power supply module, the ripple voltage degradation state detection system for an electric power supply module comprising: A monitoring module, used to obtain monitoring data of the power supply module; the monitoring data includes timing data of the output voltage, ripple voltage and temperature of the output end of the power supply module; A processing module, used for obtaining an output current quality assessment coefficient based on the monitoring data; and, obtaining a difference factor of the output current based on a change in the actual output current of the power supply module and the corresponding ripple voltage; And, based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the electric power module is obtained; the degradation state indicator is at least used to characterize the reliability of the electric power module.

[0016] As a specific solution in the technical solution of the present application, the processing module is also used to obtain the timing data of the output voltage and the ripple voltage based on the monitoring data; And, based on the time series data of the output voltage, obtaining first data; the first data is any data in the time series data of the output voltage; And, based on the timing data of the ripple voltage, obtaining second data; the timing of the second data is the same as the timing of the first data; And, based on the first data and the second data, obtaining a ripple voltage occupancy rate corresponding to the power supply module; the ripple voltage occupancy rate is at least used to characterize the synchronization of the output voltage and the ripple voltage change; And, based on the ripple voltage occupancy rate, the output current quality evaluation coefficient is obtained.

[0017] As a specific solution in the technical solution of the present application, the processing module obtains the calculation formula of the ripple voltage occupancy rate corresponding to the power supply module based on the first data and the second data as follows: in, represents the ripple voltage occupancy rate corresponding to the i-th sequential power supply module; Represents the output voltage value of the i-th time sequence; Indicates the ripple voltage value of the i-th time sequence; Indicates the minimum value of the output voltage in each timing sequence; Indicates the minimum value of the ripple voltage in each timing sequence; Expressed as a constant greater than 0; Represents a normalization function, which is used to map the values ​​in the brackets to the interval (0, 1).

[0018] As a specific solution in the technical solution of the present application, the processing module is also used to obtain a third coefficient, a fourth coefficient and a fifth coefficient based on the ripple voltage occupancy rate; the third coefficient and the fourth coefficient are two ripple voltage occupancies adjacent to each other in any time sequence; the fifth coefficient is an average value of the ripple voltage occupancies corresponding to multiple time sequences; and, obtaining a standard coefficient; the standard coefficient is preset; And, based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, an output current stability coefficient of the power supply module is obtained; the output current stability coefficient of the power supply module is at least used to characterize the discrete degree of the ripple voltage occupancy rate of each time sequence; And, based on the output current stability coefficient of the electric power module, the output current quality evaluation coefficient is obtained.

[0019] As a specific solution in the technical solution of the present application, the processing module obtains the calculation formula of the output current stability coefficient of the power supply module based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient as follows: in, Indicates the output current stability coefficient of the power supply module; N represents the timing number, which is a positive integer greater than or equal to 2; Indicates the ripple voltage occupancy rate corresponding to the kth sequential power supply module; Indicates the ripple voltage occupancy rate corresponding to the k+1th sequential power supply module; Indicates the absolute value. Indicates the average value of the ripple voltage occupancy rate of N time sequences; Represents the standard coefficient.

[0020] As a specific solution in the technical solution of the present application, the processing module is also used to obtain a set current value of the power supply module; And, based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module, the output current quality evaluation coefficient is obtained.

[0021] As a specific solution in the technical solution of the present application, the processing module obtains the calculation formula of the output current quality evaluation coefficient based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module as follows: Wherein, V represents the output current quality assessment coefficient; Indicates the total number of time series; Indicates the output current value of the kth time sequence; Indicates the set current value of the power supply module; Represents the output current stability coefficient, output current quality assessment coefficient, and output current stability coefficient of the power supply module corresponding to the power supply module.

[0022] As a specific solution in the technical solution of the present application, the processing module is also used to obtain a first temperature and a second temperature based on the monitoring data; the first temperature and the second temperature are any two temperature data adjacent in the time series data of the temperature; And, based on the first temperature and the second temperature, a difference factor of the output current is obtained.

[0023] As a specific solution in the technical solution of the present application, the processing module obtains the calculation formula of the degradation state index of the power supply module based on the output current quality evaluation coefficient and the output current difference factor as follows: in, Indicator indicating the degradation status of the power supply module; represents a normalization function, which is used to map the value in the brackets to the interval (0, 1); V represents the output current quality evaluation coefficient corresponding to the power supply module, Indicates the lower limit of the actual output current of the power supply module, represents the upper limit of the actual output current of the power supply module, Indicates the lower limit of the rated current, Indicates the upper limit of the rated current, represents the first eigenvalue, represents the second eigenvalue, Indicates the difference factor of the output current corresponding to the power supply module.

[0024] Compared with the prior art, the beneficial effects of this application are: This application evaluates and determines the degradation state of the power supply module by analyzing the change characteristics of the output voltage and the corresponding ripple voltage of the power supply module (that is, the output current quality evaluation coefficient), and analyzing the difference characteristics of the output current during the operation of the power supply module (that is, the difference factor of the output current). Compared with the prior art that only uses the output voltage conversion rate to evaluate and determine the degradation state of the power supply module, this application evaluates the corresponding degradation state by analyzing the output current stability and ripple voltage change rate of this power supply module, and the evaluation result can be made more accurate by superimposing multiple factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a flow chart of a method for detecting a ripple voltage degradation state of an electric power module proposed in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a ripple voltage degradation state detection system for an electric power module proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the description of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, such as the output current quality assessment coefficient and the output current difference factor proposed below, which belong to different coefficients. It should be understood that the coefficients used in this way can be interchanged where appropriate, so that the embodiments described here can be implemented in an order other than the content illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices. The division of modules that appear in the embodiments of the present application is only a logical division. There may be other division methods when implemented in actual applications, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, and the indirect coupling or communication connection between modules can be electrical or other similar forms, which are not limited in the embodiments of the present application. Furthermore, the modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed in multiple circuit modules, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0028] It should be clear that in order to solve the technical problem that the ripple voltage degradation state detection method of the power supply module in the prior art proposed in the background technology has a certain hysteresis, resulting in inaccurate degradation assessment results, the present application proposes an embodiment of the ripple voltage degradation state detection method of the power supply module, such as Figure 1 As shown, the method for detecting the ripple voltage degradation state of the power supply module includes steps S100 to S400.

[0029] Step S100: Acquire monitoring data of the power supply module.

[0030] It should be clear that the main function of the power supply module in the DC power supply cabinet is to convert AC power into DC power, ensure the stable output of the DC power supply, and determine different output voltage levels and output branches for different power supply equipment. The degradation of the power supply module will lead to a decrease in the stability of the output voltage, which is specifically manifested in the decrease in the conversion efficiency of the output voltage and the increase in the amplitude of the ripple voltage. Therefore, this embodiment obtains the real-time output voltage of the power supply module by installing a voltage sensor at the output end of the power supply module, and obtains the corresponding ripple voltage during the operation of the power supply module through an oscilloscope, and installs a temperature sensor to obtain the temperature data of the power supply module. That is to say, in an embodiment of the present application, the monitoring data includes the timing data of the output voltage, ripple voltage and temperature at the output end of the power supply module.

[0031] In an embodiment of the present application, there is no restriction on the frequency of obtaining monitoring data. For example, the real-time output voltage, ripple voltage and temperature of the power supply module can be obtained. It is easy to understand that if the amount of monitoring data is large, the amount of data to be processed in the subsequent analysis process is larger; if the amount of monitoring data is small, the accuracy in the subsequent analysis process is worse. In order to ensure the accuracy of subsequent analysis, the amount of monitoring data is also small enough. In an embodiment of the present application, the monitoring data can be sampled starting at the time when the power supply module starts working, and the sampling interval is set to 0.05 seconds, so as to obtain the monitoring data of the power supply module.

[0032] It should be noted that obtaining the real-time output voltage of the power supply module through a voltage sensor, obtaining the ripple voltage of the power supply module through an oscilloscope decomposition, and obtaining the temperature data of the power supply module through a temperature sensor are mature technologies and will not be described in detail here.

[0033] Step S200: Based on the monitoring data, an output current quality assessment coefficient is obtained.

[0034] Under normal circumstances, the ripple voltage of the power supply module should be within the specified range of the design. If the ripple voltage increases, it may mean that the output voltage conversion performance of the power supply module has decreased or other components have degraded. Since evaluating the degree of degradation of the power supply based solely on the output ripple voltage is unscientific, discontinuous, and unintuitive, and the fluctuation characteristics of the ripple voltage can more intuitively reflect the stability of the power supply output, in this embodiment, the quality assessment coefficient of this power supply module can be determined in combination with the real-time ripple voltage occupancy rate and the output current stability. That is to say, in this embodiment, the output current quality assessment coefficient is at least used to characterize the stability of the output voltage and ripple voltage at the output end of the power supply module.

[0035] In an embodiment of the present application, the output current quality evaluation coefficient can be obtained based on the monitoring data in any reasonable manner. For example, the variance or standard deviation of the ripple voltage time series data can be used as the output current quality evaluation coefficient.

[0036] It should be noted that the quality of the power supply module can generally be measured by the ratio of the ripple voltage of the power supply module to the output voltage timing value of the power supply module. If the ratio is smaller, it means that the output voltage of the power supply module is closer to pure DC and the quality is better; otherwise, it means that the AC noise in the output power of the power supply module is larger, that is, the output voltage of the power supply module is more unstable.

[0037] In order to obtain an output current quality evaluation coefficient that can accurately characterize the output voltage and ripple voltage stability of the output end of the power supply module, in one embodiment of the present application, step S200, based on the monitoring data, obtains the output current quality evaluation coefficient, including steps S210 to S250.

[0038] Step S210: Based on the monitoring data, obtaining timing data of the output voltage and the ripple voltage.

[0039] It should be clear that obtaining some specific data (for example, timing data of output voltage or timing data of ripple voltage, etc.) by screening monitoring data is a mature technology and will not be elaborated here.

[0040] Step S220: acquiring first data based on the timing data of the output voltage.

[0041] It should be clear that, in this embodiment, the first data is any data in the time series data of the output voltage. That is, the first data can be a historical output voltage or a current output voltage.

[0042] Step S230: acquiring second data based on the timing data of the ripple voltage.

[0043] It should be clear that in this embodiment, the second data and the first data have the same timing. It should be noted that since the timing data of the output voltage and the timing data of the ripple voltage are one-to-one corresponding, if the timing is determined, the first data and the second data are also determined.

[0044] Step S240: based on the first data and the second data, obtaining a ripple voltage occupancy rate corresponding to the power supply module.

[0045] It should be clear that in this embodiment, the ripple voltage occupancy rate is at least used to characterize the synchronization of the output voltage and the ripple voltage change. For example, the ripple voltage occupancy rate may be the ratio of the ripple voltage to the output voltage, or in step S240, based on the first data and the second data, the calculation formula for obtaining the ripple voltage occupancy rate corresponding to the power supply module is as follows: in, represents the ripple voltage occupancy rate corresponding to the i-th sequential power supply module; represents the output voltage value of the i-th time sequence (i.e., the first data); represents the ripple voltage value of the i-th time sequence (ie, the second data); Indicates the minimum value of the output voltage in each timing sequence; Indicates the minimum value of the ripple voltage in each timing sequence; Expressed as a constant greater than 0; Represents a normalization function, which is used to map the values ​​in the brackets to the interval (0, 1).

[0046] It should be noted that in the embodiments of the present application, the constant The purpose is to avoid the denominator being zero, in order to avoid the constant Affects calculation results, constant Can take infinitesimal amount. In this embodiment, / Represents the The ratio of the timing ripple voltage to the output voltage. The larger the value, the larger the amplitude of the corresponding timing ripple voltage relative to the peak value of the output voltage, which means that the noise is more obvious at this time, that is, the output voltage stability is worse, and vice versa. ( ) / ( ) represents the The stability of the ripple voltage and output voltage of a timing sequence, the larger the value, the greater the overall fluctuation amplitude of the ripple voltage relative to the overall fluctuation amplitude of the output voltage. In other words, the fluctuation amplitude of the ripple voltage value of the timing sequence is relatively larger, that is, the output voltage stability of the timing sequence is worse.

[0047] Step S250: based on the ripple voltage occupancy rate, obtaining the output current quality assessment coefficient.

[0048] In an embodiment of the present application, the ripple voltage occupancy rate can be directly used as the output current quality evaluation coefficient. It should be noted that the ripple voltage occupancy rate can only evaluate the stability of the output voltage of the power supply module under a certain timing. In order to evaluate the stability of the output voltage of the power supply module during the overall use process. In one embodiment of the present application, step S250, based on the ripple voltage occupancy rate, obtains the output current quality evaluation coefficient, including steps S251 to S254.

[0049] Step S251: Based on the ripple voltage occupancy rate, obtain the third coefficient, the fourth coefficient and the fifth coefficient.

[0050] It should be noted that, as can be seen from the foregoing, each timing corresponds to a ripple voltage occupancy rate. If there are multiple timings, the ripple voltage occupancy rate also corresponds to multiple. In this embodiment, the third coefficient and the fourth coefficient are two ripple voltage occupancies adjacent to any timing; the fifth coefficient is the average value of the ripple voltage occupancies corresponding to multiple timings. It is easy to understand that if the output voltage of the power supply module is stable, the third coefficient, the fourth coefficient and the fifth coefficient must also be close. If the output voltage of the power supply module is unstable, the gap between the third coefficient, the fourth coefficient and the fifth coefficient must also increase.

[0051] Step S252: Obtain standard coefficients.

[0052] Specifically, in this embodiment, the standard coefficient is preset. In the embodiment of the present application, the standard coefficient can be set according to demand, for example, the standard coefficient can be a fixed value, or the standard coefficient can be the ripple voltage occupancy rate of the power supply module when it leaves the factory.

[0053] Step S253: Based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, obtain the output current stability coefficient of the power supply module.

[0054] It should be clear that in this embodiment, the output current stability coefficient of the power supply module is at least used to characterize the discrete degree of the ripple voltage occupancy rate of each time sequence. For example, the output current stability coefficient of the power supply module can be the ratio of the fifth coefficient and the standard coefficient. If the ratio of the fifth coefficient to the standard coefficient is larger, the discrete degree of the ripple voltage occupancy rate of each time sequence is larger, that is, the state of the power supply module is more deteriorated, otherwise the state of the power supply module is more optimized. In one embodiment of the present application, step S253, based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, the calculation formula for obtaining the output current stability coefficient of the power supply module is as follows: in, Indicates the output current stability coefficient of the power supply module; N represents the timing number, which is a positive integer greater than or equal to 2; Indicates the ripple voltage occupancy rate (i.e., the third coefficient) corresponding to the kth sequential power supply module; represents the ripple voltage occupancy rate (i.e., the fourth coefficient) corresponding to the k+1th sequential power supply module; Indicates the absolute value. Represents the average value of the ripple voltage occupancy rate of N time sequences (also known as the fifth coefficient); It represents the standard coefficient. According to the DL / T781-2021 "High-frequency switching rectifier module for power use" standard, the output ripple (noise) voltage is generally required to not exceed 200mV peak-to-peak.

[0055] It should be clear that in this embodiment, It is the average difference between the ripple voltage occupancy rates of any adjacent timings in the power supply module (that is, the discrete degree of the ripple voltage occupancy rate of each timing), which represents the fluctuation degree of the ripple voltage occupancy rate. The larger its value is, the more discrete the ripple voltage occupancy rate of each timing of this power supply module is, and the lower the output voltage stability of the power supply module is, that is, the output current stability coefficient of the power supply module. The bigger. Represents the overall change degree of the ripple voltage occupancy rate of the power supply module. The larger its value is, the greater the difference between the average ripple voltage occupancy rate of the power supply module and the standard coefficient is, and the lower the stability of the power supply module is. In summary, in this embodiment, if the output current stability coefficient of the power supply module is The larger the value, the lower the stability of the output voltage corresponding to the power supply module; if the output current stability coefficient of the power supply module The smaller the value, the higher the stability of the output voltage corresponding to the power supply module.

[0056] Step S254: Based on the output current stability coefficient of the power supply module, the output current quality assessment coefficient is obtained.

[0057] It should be clear that in the embodiment of the present application, the output current stability coefficient of the power supply module can be directly used as the output current quality evaluation coefficient. It should be noted that the degraded power supply module is mainly manifested in that the output voltage cannot reach the rated voltage value and the ripple voltage accounts for a large proportion of the output voltage. The ripple voltage occupancy rate in the above text represents the stability of the output voltage of the power supply module. However, it is difficult to accurately determine whether the power supply module is degraded by relying solely on the stability of the output voltage of the power supply module. In order to accurately determine whether the power supply module is degraded, in the embodiment of the present application, the voltage conversion efficiency can also be introduced. It can be seen from the background technology that the voltage conversion efficiency represents the operating capacity of the power supply module. If the output voltage stability of a power supply module is higher and the voltage conversion efficiency is higher, it means that the quality of the power supply module is better and the degree of degradation is lower. In a specific embodiment of the present application, step S254, based on the output current stability coefficient of the power supply module, obtains the output current quality evaluation coefficient, including steps S255 and S256.

[0058] Step S255: Obtain the set current value of the power supply module.

[0059] It should be clear that obtaining the set current value of the power supply module is a mature technology and will not be elaborated here.

[0060] Step S256: Based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module, the output current quality evaluation coefficient is obtained.

[0061] Specifically, in this embodiment, in step S256, based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module, the calculation formula for obtaining the output current quality evaluation coefficient is as follows: Wherein, V represents the output current quality assessment coefficient; Indicates the total number of time series; Indicates the output voltage value of the kth time sequence; Indicates the set current value of the power supply module; Indicates the output current stability coefficient of the power supply module corresponding to the power supply module. In this embodiment, the set current value of the power supply module is 10A. In specific applications, the implementer can set it according to specific circumstances.

[0062] It should be noted that since the power supply module converts AC power into DC power of a fixed voltage, the real-time output current of the power supply module represents the current value after conversion. Therefore, the voltage conversion efficiency of the power supply module can be determined by the difference between the real-time output current value and the set current value, and then the ratio with the set current value. It is used to reflect the steady current accuracy, which is another important indicator of the high-frequency power supply module. Represents the current conversion efficiency of the power supply module. The larger the value, the greater the difference between the output current of the power supply module and the set current value in most time sequences, indicating that the current conversion efficiency of the power supply module is lower and the output current quality evaluation coefficient V is smaller. As can be seen from the previous text, if the output current stability coefficient of the power supply module is The larger the value, the lower the stability of the output current corresponding to the power supply module, and the smaller the output current quality assessment coefficient V.

[0063] Step S300: obtaining a difference factor of the output current based on the actual output current of the power supply module and the change of the corresponding ripple voltage.

[0064] It should be noted that in this embodiment, for the power supply module, the output current quality assessment coefficient can effectively represent the reliability of the power supply module. As can be seen from the foregoing, the smaller the output current quality assessment coefficient, the greater the degree of degradation of the power supply module. The output current quality assessment coefficient is only based on the internal working state of the power supply module to evaluate the degree of degradation. In the embodiment of the present application, the power supply module can also be combined with external factors to evaluate its degree of degradation. It is easy to understand that the more serious the heat generation of the power supply module during operation, the more serious its degradation state. The DL / T781-2021 "High-frequency switching rectifier module for power" standard stipulates that the error of the output current is generally required to be between ±0.8% and ±1% of the rated output current.

[0065] In a specific embodiment of the present application, step S300, based on the actual output current of the power supply module and the change of the corresponding ripple voltage, obtains the difference factor of the output current, including step S310 and step S320.

[0066] Step S310: obtaining a first characteristic value and a second characteristic value based on the actual output current of the power supply module and the change of the corresponding ripple voltage.

[0067] Step S320: obtaining a difference factor of the output current based on the first eigenvalue and the second eigenvalue.

[0068] In this embodiment, in step S320, based on the first characteristic value and the second characteristic value, a calculation formula for obtaining a difference factor of the output current is as follows: Where M is the difference factor of the output current, Indicates the lower limit of the actual output current of the power supply module, represents the upper limit of the actual output current of the power supply module, Indicates the lower limit of the rated current, Indicates the upper limit of the rated current, represents the first eigenvalue, represents the second eigenvalue.

[0069] It represents the current accuracy of this power supply module. The current accuracy is measured by comparing the fluctuation error of the actual output current with the standard value. The larger the value, the closer the actual output current is within the standard range, which means that the current accuracy is higher, and the difference factor of the output current is larger.

[0070] Step S400: obtaining a degradation status indicator of the power supply module based on the output current quality assessment coefficient and the output current difference factor.

[0071] It should be clear that in this embodiment, the degradation state indicator is at least used to characterize the reliability of the power supply module. In an embodiment of the present application, the degradation state indicator of the power supply module can be obtained in any suitable manner based on the output current quality evaluation coefficient and the difference factor of the output current. In another embodiment of the present application, step S400, based on the output current quality evaluation coefficient and the difference factor of the output current, the calculation formula for obtaining the degradation state indicator of the power supply module is as follows: in, Indicator indicating the degradation status of the power supply module; represents a normalization function, which is used to map the value in the brackets to the interval (0, 1); V represents the output current quality evaluation coefficient corresponding to the power supply module, It represents the difference factor of the output current, that is, the difference factor of the output current corresponding to the power supply module.

[0072] The output current difference factor is used to reflect the current accuracy of the power supply module. The current accuracy is measured by comparing the difference between the actual output current fluctuation error and the standard value. The larger the output current difference factor, the closer the corresponding actual output current is within the standard range, indicating that the current accuracy is higher, and the corresponding degree of degradation is lower. At the same time, combined with the output current quality assessment coefficient corresponding to the power supply module, since the larger the output current quality assessment coefficient corresponds to the lower degree of degradation, the degradation index is obtained by combining the two. And the result is normalized to the range of [0,1]. The larger the degradation state index of the power source is, the greater the degree of degradation is.

[0073] It is easy to understand that in this embodiment, the degradation state indicator It is proportional to the degree of degradation of the power supply module. If the degradation status index The larger the value, the greater the degree of degradation of the power supply module; if the degradation status index The smaller it is, the less deterioration of the power supply module.

[0074] According to the embodiment of the ripple voltage degradation state detection method of the power supply module proposed in the present application, the degradation state of the power supply module can be detected based on the degradation state indicator of the power supply module. According to the provisions on power supply performance in the DL / T781-2021 "High-frequency switching rectifier module for power use" standard, if the degradation state indicator of the power supply module is , the corresponding power supply module can be considered as a power supply module with a large degree of degradation. For such power supply modules, their output voltage can be adjusted appropriately and their operating load can be reduced to prevent overheating. They can also be replaced as a whole to avoid sudden system failures. By regularly checking, maintaining and replacing aging components, the service life of the power supply module can be effectively extended to ensure the stability and reliability of the system.

[0075] It should be clear that the embodiment of the ripple voltage degradation state detection method of the power supply module proposed in the present application determines the degradation state of the power supply module by analyzing the change characteristics of the output voltage of the power supply module and the corresponding ripple voltage (that is, the output current quality evaluation coefficient), and analyzing the difference characteristics of the output current during the operation of the power supply module (that is, the difference factor of the output current). Compared with the prior art that only uses the output voltage conversion rate to evaluate and determine the degradation state of the power supply module, the method proposed in the present application has less hysteresis, and the evaluation result can be made more accurate by superimposing multiple factors.

[0076] After introducing the embodiment of the ripple voltage degradation state detection method of the power supply module proposed in the present application, the following introduces a ripple voltage degradation state detection system of the power supply module proposed in the present application, such as Figure 2 As shown, the ripple voltage degradation state detection system 10 of the power supply module includes: The monitoring module 11 is used to obtain monitoring data of the power supply module; the monitoring data includes the timing data of the output voltage, ripple voltage and temperature of the output end of the power supply module; A processing module 12 is configured to obtain an output current quality assessment coefficient based on the monitoring data; and, obtaining a difference factor of the output current based on a change in the actual output current of the power supply module and the corresponding ripple voltage; And, based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the electric power module is obtained; the degradation state indicator is at least used to characterize the reliability of the electric power module.

[0077] As a specific embodiment of the present application, the processing module 12 is further used to obtain the timing data of the output voltage and the ripple voltage based on the monitoring data; And, based on the time series data of the output voltage, obtaining first data; the first data is any data in the time series data of the output voltage; And, based on the timing data of the ripple voltage, obtaining second data; the timing of the second data is the same as the timing of the first data; And, based on the first data and the second data, obtaining a ripple voltage occupancy rate corresponding to the power supply module; the ripple voltage occupancy rate is at least used to characterize the synchronization of the output voltage and the ripple voltage change; And, based on the ripple voltage occupancy rate, the output current quality evaluation coefficient is obtained.

[0078] As a specific embodiment of the present application, the processing module 12 obtains the calculation formula of the ripple voltage occupancy rate corresponding to the power supply module based on the first data and the second data as follows: in, represents the ripple voltage occupancy rate corresponding to the i-th sequential power supply module; Represents the output voltage value of the i-th time sequence; Indicates the ripple voltage value of the i-th time sequence; Indicates the minimum value of the output voltage in each timing sequence; Indicates the minimum value of the ripple voltage in each timing sequence; Expressed as a constant greater than 0; Represents a normalization function, which is used to map the values ​​in the brackets to the interval (0, 1).

[0079] As a specific embodiment of the present application, the processing module 12 is further used to obtain a third coefficient, a fourth coefficient and a fifth coefficient based on the ripple voltage occupancy rate; the third coefficient and the fourth coefficient are two ripple voltage occupancies adjacent to each other in any time sequence; the fifth coefficient is an average value of the ripple voltage occupancies corresponding to multiple time sequences; and, obtaining a standard coefficient; the standard coefficient is preset; And, based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, an output current stability coefficient of the power supply module is obtained; the output current stability coefficient of the power supply module is at least used to characterize the discrete degree of the ripple voltage occupancy rate of each time sequence; And, based on the output current stability coefficient of the electric power module, the output current quality evaluation coefficient is obtained.

[0080] As a specific embodiment of the present application, the processing module 12 obtains the calculation formula of the output current stability coefficient of the power supply module based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient as follows: in, Indicates the output current stability coefficient of the power supply module; N represents the timing number, which is a positive integer greater than or equal to 2; Indicates the ripple voltage occupancy rate corresponding to the kth sequential power supply module; Indicates the ripple voltage occupancy rate corresponding to the k+1th sequential power supply module; Indicates the absolute value. Indicates the average value of the ripple voltage occupancy rate of N time sequences; Represents the standard coefficient.

[0081] As a specific embodiment of the present application, the processing module 12 is further used to obtain a set current value of the power supply module; And, based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module, the output current quality evaluation coefficient is obtained.

[0082] As a specific embodiment of the present application, the processing module 12 obtains the calculation formula of the output current quality evaluation coefficient based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module as follows: Wherein, V represents the output current quality assessment coefficient; Indicates the total number of time series; Indicates the output voltage value of the kth time sequence; Indicates the set current value output current quality assessment coefficient of the power supply module; Represents the output current stability coefficient of the electric power module corresponding to the electric power module.

[0083] As a specific embodiment of the present application, the processing module 12 is further used to obtain a difference factor of the output current based on the actual output current of the power supply module and the change of the corresponding ripple voltage; Based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the power supply module is obtained.

[0084] As a specific embodiment of the present application, the processing module 12 obtains the calculation formula of the degradation state index of the power supply module based on the output current quality evaluation coefficient and the output current difference factor as follows: in, Indicator indicating the degradation status of the power supply module; represents a normalization function, which is used to map the value in the brackets to the interval (0, 1); V represents the output current quality evaluation coefficient corresponding to the power supply module, Indicates the lower limit of the actual output current of the power supply module, represents the upper limit of the actual output current of the power supply module, Indicates the lower limit of the rated current, Indicates the upper limit of the rated current, represents the first eigenvalue, represents the second eigenvalue, Indicates the difference factor of the output current corresponding to the power supply module.

[0085] It should be clear that the embodiment of the ripple voltage degradation state detection system of the power supply module proposed in the present application determines the degradation state of the power supply module by analyzing the change characteristics of the output voltage of the power supply module and the corresponding ripple voltage (that is, the output current quality evaluation coefficient), and analyzing the difference characteristics of the output current during the operation of the power supply module (that is, the difference factor of the output current). Compared with the prior art that only uses the output voltage conversion rate to evaluate and determine the degradation state of the power supply module, the system proposed in the present application has less hysteresis, and the evaluation result can be made more accurate by superimposing multiple factors.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the methods, devices and equipment described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0088] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0089] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0090] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0091] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0092] The computer program product includes one or more computer instructions. When the computer program is loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disk), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0093] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles of the present application.

Claims

1. A method for detecting a ripple voltage degradation state of an electric power supply module, characterized in that: include: Acquire monitoring data of the power supply module; the monitoring data includes timing data of output voltage, ripple voltage and temperature at the output end of the power supply module; Based on the monitoring data, obtaining an output current quality assessment coefficient; Based on the actual output current of the power supply module and the change of the corresponding ripple voltage, a difference factor of the output current is obtained; Based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the electric power module is obtained; the degradation state indicator is at least used to characterize the reliability of the electric power module.

2. The method for detecting the ripple voltage degradation state of the power supply module according to claim 1, characterized in that: The obtaining of the output current quality assessment coefficient based on the monitoring data includes: Based on the monitoring data, acquiring time series data of the output voltage and the ripple voltage; Based on the time series data of the output voltage, first data is acquired; the first data is any data in the time series data of the output voltage; Based on the timing data of the ripple voltage, obtaining second data; the timing of the second data is the same as the timing of the first data; Based on the first data and the second data, a ripple voltage occupancy rate corresponding to the power supply module is acquired; the ripple voltage occupancy rate is at least used to characterize the synchronization of the output voltage and the ripple voltage change; Based on the ripple voltage occupancy rate, the output current quality assessment coefficient is obtained.

3. The method for detecting the ripple voltage degradation state of the power supply module according to claim 2, characterized in that: The calculation formula for obtaining the ripple voltage occupancy rate corresponding to the power supply module based on the first data and the second data is as follows: in, represents the ripple voltage occupancy rate corresponding to the i-th sequential power supply module; Represents the output voltage value of the i-th time sequence; Indicates the ripple voltage value of the i-th time sequence; Indicates the minimum value of the output voltage in each timing sequence; Indicates the minimum value of the ripple voltage in each timing sequence; Expressed as a constant greater than 0; Represents a normalization function, which is used to map the values ​​in the brackets to the interval (0, 1).

4. The method for detecting the ripple voltage degradation state of the power supply module according to claim 2, characterized in that: The obtaining the output current quality evaluation coefficient based on the ripple voltage occupancy rate includes: Based on the ripple voltage occupancy rate, a third coefficient, a fourth coefficient and a fifth coefficient are obtained; the third coefficient and the fourth coefficient are two ripple voltage occupancy rates adjacent to each other in any time sequence; the fifth coefficient is an average value of the ripple voltage occupancy rates corresponding to multiple time sequences; Obtaining a standard coefficient; the standard coefficient is preset; Based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient, an output current stability coefficient of the power supply module is obtained; the output current stability coefficient of the power supply module is at least used to characterize the discrete degree of the ripple voltage occupancy rate of each time sequence; The output current quality assessment coefficient is obtained based on the output current stability coefficient of the power supply module.

5. The method for detecting the ripple voltage degradation state of the power supply module according to claim 4, characterized in that: The calculation formula for obtaining the output current stability coefficient of the power supply module based on the third coefficient, the fourth coefficient, the fifth coefficient and the standard coefficient is as follows: in, Indicates the output current stability coefficient of the power supply module; N represents the timing number, which is a positive integer greater than or equal to 2; Indicates the ripple voltage occupancy rate corresponding to the kth sequential power supply module; Indicates the ripple voltage occupancy rate corresponding to the k+1th sequential power supply module; Indicates the absolute value. Indicates the average value of the ripple voltage occupancy rate of N time sequences; Represents the standard coefficient.

6. The method for detecting the ripple voltage degradation state of the power supply module according to claim 4, characterized in that: The step of obtaining the output current quality assessment coefficient based on the output current stability coefficient of the power supply module includes: Obtaining a set current value of the power supply module; The output current quality evaluation coefficient is obtained based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module.

7. The method for detecting the ripple voltage degradation state of the power supply module according to claim 6, characterized in that: The calculation formula for obtaining the output current quality evaluation coefficient based on the set current value, the timing data of the output voltage and the output current stability coefficient of the power supply module is as follows: Wherein, V represents the output current quality assessment coefficient; Indicates the total number of time series; Indicates the output current value of the kth time sequence; Indicates the set current value of the power supply module; Represents the output current stability coefficient of the electric power module corresponding to the electric power module.

8. The method for detecting the ripple voltage degradation state of an electric power supply module according to any one of claims 1 to 7, characterized in that: The step of obtaining the difference factor of the output current based on the actual output current of the power supply module and the change of the corresponding ripple voltage includes: Obtaining a first characteristic value based on a difference between an upper limit of an actual output current of the power supply module and an upper limit of a rated current, and obtaining a second characteristic value based on a difference between a lower limit of an actual output current of the power supply module and a lower limit of a rated current; A difference factor of an output current is obtained based on the first characteristic value and the second characteristic value.

9. The method for detecting the ripple voltage degradation state of the power supply module according to claim 8, characterized in that: The calculation formula for obtaining the degradation status index of the power supply module based on the output current quality evaluation coefficient and the output current difference factor is as follows: in, Indicator indicating the degradation status of the power supply module; represents a normalization function, which is used to map the value in the brackets to the interval (0, 1); V represents the output current quality evaluation coefficient corresponding to the power supply module, Indicates the lower limit of the actual output current of the power supply module, represents the upper limit of the actual output current of the power supply module, Indicates the lower limit of the rated current, Indicates the upper limit of the rated current, represents the first eigenvalue, represents the second eigenvalue, Indicates the difference factor of the output current corresponding to the power supply module.

10. A ripple voltage degradation state detection system for an electric power supply module, characterized in that: include: A monitoring module, used to obtain monitoring data of the power supply module; the monitoring data includes timing data of the output voltage, ripple voltage and temperature of the output end of the power supply module; A processing module, used for obtaining an output current quality assessment coefficient based on the monitoring data; and, obtaining a difference factor of the output current based on a change in an actual output current of the power supply module and a corresponding ripple voltage; And, based on the output current quality assessment coefficient and the output current difference factor, a degradation state indicator of the electric power module is obtained; the degradation state indicator is at least used to characterize the reliability of the electric power module.

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