A DC power supply aging test method, device and system

Abstract

The present invention relates to the technical field of electrical parameter measurement, and particularly relates to a method, device and system for aging test of a bidirectional DC power supply, including: obtaining monitoring data during the aging test of the bidirectional DC power supply in a high-temperature environment; determining a first stability parameter according to the first current data and the first voltage data at adjacent moments; determining a switching duration according to the termination detection moment of the first monitoring period and the start detection moment of the second monitoring period; determining the similarity between the current fluctuation and the voltage fluctuation after switching according to the second current data and the second voltage data at each adjacent moment; determining a first quantity of monitoring periods in a stable state when the bidirectional DC power supply performs current switching according to the first stability parameter, the switching duration and the similarity; determining the aging test result of the bidirectional DC power supply according to a second quantity of the total monitoring periods of the bidirectional DC power supply and the first quantity. The present invention improves the accuracy of the aging test result of the bidirectional DC power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical parameter measurement, and particularly to a method, device and system for aging test of a DC power supply. Background Art

[0002] A bidirectional DC power supply is a power supply device that can transmit electrical energy in two directions. It can not only be used as a power supply to charge a load, but also absorb energy from an external power supply as a load. The bidirectional DC power supply can switch between the forward and reverse directions to achieve bidirectional energy flow. Among them, with the continuous use of the bidirectional DC power supply, the bidirectional DC power supply will age, so it is necessary to perform an aging detection on the bidirectional DC power supply.

[0003] In some scenarios, the bidirectional DC power supply is placed in a high-temperature environment for aging detection, and the stability of the bidirectional DC power supply is used to detect whether the bidirectional DC power supply is aging. However, for the bidirectional DC power supply, due to the current switching operation, the high-temperature environment will combine with the temperature rise phenomenon of the internal components of the bidirectional DC power supply, resulting in an increase in resistance, thereby affecting the switching efficiency of the bidirectional DC power supply. Thus, detecting the stability of the bidirectional DC power supply to perform aging detection on the bidirectional DC power supply may cause a difference between the aging test result of the bidirectional DC power supply and the actual situation, resulting in a low accuracy of the aging test result of the bidirectional DC power supply. Summary of the Invention

[0004] In order to solve the technical problem of low accuracy of the aging test result of the bidirectional DC power supply, the purpose of the present invention is to provide a method, device and system for aging test of a DC power supply, and the specific technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for aging test of a DC power supply, including: obtaining monitoring data during the aging test of a bidirectional DC power supply in a high-temperature environment, where the monitoring data includes first current data and first voltage data during a first monitoring period in the forward direction of the bidirectional DC power supply, and second current data and second voltage data during a second monitoring period in the reverse direction of the bidirectional DC power supply; determining a first stability parameter of the first monitoring period according to the first current data and the first voltage data at adjacent moments; determining a switching duration when the bidirectional DC power supply performs a period switch according to the termination detection moment of the first monitoring period and the start detection moment of the second monitoring period; determining the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after the period switch according to the second current data and the second voltage data at adjacent moments; determining a first number of monitoring periods in a stable state when the bidirectional DC power supply performs a current switch according to the first stability parameter, the switching duration, and the similarity; and determining the aging test result of the bidirectional DC power supply according to a second number of the total monitoring periods of the bidirectional DC power supply and the first number.

[0006] Optionally, determining the first stability parameter of the first monitoring period based on the first current data and the first voltage data at adjacent moments includes: calculating a first difference sequence of first differences between the first current data at adjacent moments within the first monitoring period, a second difference sequence of second differences between the first voltage data at adjacent moments, a first ratio between the first current data at adjacent moments, and a second ratio between the first voltage data at adjacent moments; determining a first fluctuation coefficient of the forward current in the positive test direction based on the first difference sequence and the first ratio, and determining a second fluctuation coefficient of the forward voltage in the positive test direction based on the second difference sequence and the second ratio; and determining the first stability parameter of the first monitoring period by using the first fluctuation coefficient, the second fluctuation coefficient, the maximum current value and the maximum voltage value within the first monitoring period.

[0007] Optionally, determining the first fluctuation coefficient of the forward current in the positive test direction based on the first difference sequence and the first ratio includes: calculating a first average value of the first ratios between the first current data at adjacent moments; determining the maximum value of the first differences from the first difference sequence; and determining the first product of the first average value and the maximum value of the first differences as the first fluctuation coefficient; determining the second fluctuation coefficient of the forward voltage in the positive test direction based on the second difference sequence and the second ratio includes: calculating a second average value of the second ratios between the first voltage data at adjacent moments; determining the maximum value of the second differences from the second difference sequence; and determining the second product of the second average value and the maximum value of the second differences as the second fluctuation coefficient.

[0008] Optionally, determining the first stability parameter of the first monitoring period by using the first fluctuation coefficient, the second fluctuation coefficient, the maximum current value and the maximum voltage value within the first monitoring period includes: calculating a third ratio between the first fluctuation coefficient and the second fluctuation coefficient, and the absolute value of the third difference between the third ratio and a preset value; calculating a fourth ratio between the maximum current value and the maximum voltage value, and calculating the third product of the absolute value of the third difference and the fourth ratio; and performing a normalization process on the third product to obtain the first stability parameter.

[0009] Optionally, determining the similarity between the current fluctuation and the voltage fluctuation after the bidirectional DC power supply performs periodic switching according to the second current data and the second voltage data at adjacent moments includes: calculating a third difference sequence of fourth differences between the second current data at adjacent moments within the second monitoring period, a fourth difference sequence of fifth differences between the second voltage data at adjacent moments, a fifth ratio between the second current data at adjacent moments, and a sixth ratio between the second voltage data at adjacent moments; determining a third fluctuation coefficient of the bidirectional DC power supply after switching according to the third difference sequence and the fifth ratio, and determining a fourth fluctuation coefficient of the bidirectional DC power supply after switching according to the fourth difference sequence and the sixth ratio; determining a first recovery duration of the bidirectional DC power supply from the current fluctuation state to the stable state after switching according to the third fluctuation coefficient and determining a second recovery duration of the bidirectional DC power supply from the voltage fluctuation state to the stable state after switching according to the fourth fluctuation coefficient; determining a second stability parameter of the second monitoring period according to the third fluctuation coefficient, the fourth fluctuation coefficient, the maximum current value and the maximum voltage value within the second monitoring period; determining the similarity between the current fluctuation and the voltage fluctuation after the bidirectional DC power supply switches based on the first recovery duration, the second recovery duration and the second stability parameter.

[0010] Optionally, determining the third fluctuation coefficient of the bidirectional DC power supply after switching according to the third difference sequence and the fifth ratio includes: selecting the maximum value of the fourth differences from the third difference sequence; calculating the reciprocal of the absolute value of the sixth difference between the fifth ratio and the preset value, and calculating the fourth product between the reciprocal of the absolute value of the sixth difference and the maximum value of the fourth differences; performing a normalization process on the fourth product to obtain the third fluctuation coefficient; determining the fourth fluctuation coefficient of the bidirectional DC power supply after switching according to the fourth difference sequence and the sixth ratio includes: selecting the maximum value of the fifth differences from the fourth difference sequence; calculating the reciprocal of the absolute value of the seventh difference between the sixth ratio and the preset value, and calculating the fifth product between the reciprocal of the absolute value of the seventh difference and the maximum value of the fifth differences; performing a normalization process on the fifth product to obtain the fourth fluctuation coefficient.

[0011] Optionally, determining the similarity between the current fluctuation and the voltage fluctuation after the bidirectional DC power supply switches based on the first recovery duration, the second recovery duration and the second stability parameter includes: calculating the reciprocal of the absolute value of the eighth difference between the first recovery duration and the second recovery duration; determining that the sixth product between the reciprocal of the absolute value of the eighth difference and the second stability parameter is the similarity.

[0012] Optionally, determining the first quantity of monitoring periods in a stable state when a bidirectional DC power supply performs current switching according to the first stability parameter, switching duration, and similarity includes: determining a steady-state recovery index when the bidirectional DC power supply performs current switching after completion of the first monitoring period according to the first stability parameter, switching duration, and similarity; determining a variation coefficient between the steady-state recovery indices within adjacent monitoring periods according to the steady-state recovery indices of adjacent monitoring periods; determining an influence parameter that affects the stability of the bidirectional DC power supply during current switching according to the variation coefficient and the switching duration of adjacent monitoring periods; performing normalization processing on the influence parameter using a reverse min-max function to obtain a normalized value; marking the monitoring periods with a normalized value greater than a threshold to obtain the first quantity of monitoring periods in a stable state when the bidirectional DC power supply performs current switching.

[0013] In a second aspect, an embodiment of the present invention provides a DC power supply aging test device, including: an acquisition module, configured to acquire monitoring data during an aging test of a bidirectional DC power supply in a high-temperature environment, where the monitoring data includes first current data and first voltage data within a first monitoring period in the positive direction of the bidirectional DC power supply, and second current data and second voltage data within a second monitoring period in the reverse direction of the bidirectional DC power supply; a determination module, configured to determine a first stability parameter of the first monitoring period according to the first current data and the first voltage data at each adjacent moment; the determination module is further configured to determine a switching duration when the bidirectional DC power supply performs periodic switching according to the termination detection moment of the first monitoring period and the start detection moment of the second monitoring period; the determination module is further configured to determine the similarity between current fluctuations and voltage fluctuations of the bidirectional DC power supply after performing periodic switching according to the second current data and the second voltage data at each adjacent moment; the determination module is further configured to determine the first quantity of monitoring periods in a stable state when the bidirectional DC power supply performs current switching according to the first stability parameter, switching duration, and similarity; the determination module is further configured to determine an aging test result of the bidirectional DC power supply according to a second quantity of the total monitoring periods of the bidirectional DC power supply and the first quantity.

[0014] In a third aspect, an embodiment of the present invention provides a DC power supply aging test system, including: a processor and a memory; wherein, the memory is used to store a computer program that can run on the processor; the processor is configured to execute the program stored on the memory to implement the steps of the DC power supply aging test method as mentioned in the first aspect.

[0015] The present invention has the following beneficial effects: First, obtain the monitoring data during the aging test of the bidirectional DC power supply in a high-temperature environment. The monitoring data includes the first current data and the first voltage data during the first monitoring period in the positive direction of the bidirectional DC power supply, and the second current data and the second voltage data during the second monitoring period in the reverse direction of the bidirectional DC power supply. Then, determine the first stability parameter of the first monitoring period according to the first current data and the first voltage data at adjacent moments. Next, determine the switching duration when the bidirectional DC power supply performs cycle switching according to the termination detection moment of the first monitoring period and the start detection moment of the second monitoring period. Secondly, determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after cycle switching according to the second current data and the second voltage data at adjacent moments. And determine the first number of monitoring periods in a stable state when the bidirectional DC power supply performs current switching according to the first stability parameter, the switching duration, and the similarity. Finally, determine the aging test result of the bidirectional DC power supply according to the second number of the total monitoring periods of the bidirectional DC power supply and the first number.

[0016] In this way, the embodiment of the present invention monitors the voltage data and current data of the bidirectional DC power supply in the positive and negative directions, and obtains the stability of the bidirectional DC power supply during current switching, the switching duration during cycle switching, and the similarity between the current fluctuation and the voltage fluctuation during cycle switching in a high-temperature environment. Finally, based on this stability, switching duration, and similarity, determine the number of monitoring periods in a stable state when the bidirectional DC power supply performs switching, so as to obtain the aging test result of the bidirectional DC power supply. Therefore, the embodiment of the present invention considers the influence of the high-temperature environment on the switching efficiency when the bidirectional DC power supply switches, reduces the difference between the aging test result of the bidirectional DC power supply and the actual situation, and improves the accuracy of the aging test result of the bidirectional DC power supply. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a flowchart of a method for aging test of a DC power supply provided by an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a device for aging test of a DC power supply provided by an embodiment of the present invention.

[0020] Figure 3Schematic diagram of a DC power supply aging test system provided by an embodiment of the present invention. Detailed implementation manners

[0021] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following combines the accompanying drawings and preferred embodiments to detail a DC power supply aging test method proposed according to the present invention, its specific implementation manners, structures, features and effects. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0023] It should be noted that to ensure the significance of the calculation results, when performing fractional operations in the embodiments of the present invention, in the case of a denominator of 0, a tuning factor greater than 0 needs to be added to the denominator to prevent the denominator from being 0. The value of the tuning factor is set by the implementer according to the actual situation, and this application does not make special restrictions.

[0024] The following specifically describes the specific solution of a DC power supply aging test method provided by the present invention with reference to the accompanying drawings.

[0025] Embodiment 1:

[0026] Please refer to Figure 1 , which shows the flowchart of the DC power supply aging test method provided by an embodiment of the present invention, including:

[0027] S101, obtaining the monitoring data during the aging test of the bidirectional DC power supply in a high-temperature environment.

[0028] Among them, the monitoring data includes the first current data and the first voltage data of the bidirectional DC power supply in the first monitoring period in the positive direction, and the second current data and the second voltage data of the bidirectional DC power supply in the second monitoring period in the reverse direction.

[0029] Specifically, in the embodiments of the present invention, the bidirectional DC power supply can be selected as a bidirectional DC power supply with a color touch screen and physical buttons to improve the operation flexibility and usage efficiency. Its product model can be determined according to actual test requirements. In the embodiments of the present invention, the bidirectional DC power supply with the product model BD651000-30 is selected for aging test. The test equipment participating in the aging test of the bidirectional DC power supply can be a current sensor, a voltage sensor, and an aging test chamber. The test environment is that the aging test chamber and loads and power supplies are connected to the two poles of the bidirectional DC power supply, and a high-temperature environment is set in the aging test chamber. In the embodiments of the present invention, the temperature in the aging test chamber is set to .

[0030] Further, when testing the bidirectional DC power supply, a current sensor and a voltage sensor are used to monitor the voltage and current data during the testing process of the bidirectional DC power supply. The monitoring data is recorded according to the time series. In the embodiments of the present invention, the voltage data detected at the i-th moment is recorded as , and the current data is . The initial test direction of the bidirectional DC power supply is set as the positive direction, which is recorded as in the embodiments of the present invention, and vice versa is . Then the positive voltage data is , and the reverse voltage data is . The current is switched every 1 h, that is, a monitoring cycle is completed . In the embodiments of the present invention, the detection time is specific to , and detection is performed every 2 s. The detection time between adjacent monitoring cycles uses the number of moments when the current data is redetected as the initial moment of the next monitoring cycle. In the embodiments of the present invention, the monitoring cycle of the bidirectional DC power supply in the positive direction is recorded as the first monitoring cycle, and the monitoring cycle of the bidirectional DC power supply in the reverse direction is recorded as the second monitoring cycle.

[0031] S102. Determine the first stability parameter of the first monitoring cycle according to the first current data and the first voltage data at each adjacent moment.

[0032] Specifically, the bidirectional DC power supply belongs to a type of DC power supply. A DC power supply is a power supply device that provides a stable DC voltage. When conducting a test, it mainly tests the state stability of the DC power supply. In the embodiments of the present invention, that is, to conduct a stability test on the bidirectional DC power supply.

[0033] Further, when determining the first stability parameter of the first monitoring period, as an alternative embodiment of the present invention, first calculate the first difference sequence of the first differences between the first current data at adjacent moments within the first monitoring period, the second difference sequence of the second differences between the first voltage data at adjacent moments, the first ratio between the first current data at adjacent moments, and the second ratio between the first voltage data at adjacent moments; then determine the first fluctuation coefficient of the forward current in the positive test direction according to the first difference sequence and the first ratio, and determine the second fluctuation coefficient of the forward voltage in the reverse test direction according to the second difference sequence and the second ratio; secondly, use the first fluctuation coefficient, the second fluctuation coefficient, the maximum current value and the maximum voltage value within the first monitoring period to determine the first stability parameter of the first monitoring period.

[0034] Specifically, in the embodiment of the present invention, the first difference sequence of the first differences between the first current data at adjacent moments within the first monitoring period is obtained. In the embodiment of the present invention, this first difference sequence is denoted as . represents the first difference between the first current data at adjacent moments i and i + 1 in the positive direction. Further, according to the ratio between the current data obtained at adjacent moments, the first fluctuation coefficient of the forward current in the positive test direction is determined. At the same time, to avoid the pseudo-steady state caused by the continuous increase and similar amplitude of fluctuations at adjacent moments, the difference value between the maximum amplitude and the minimum amplitude that appears during the monitoring process is used as a reference factor for the first fluctuation coefficient. It should be noted that in the above embodiment, the positive test direction refers to the positive direction of the bidirectional DC power supply, and the reverse test direction refers to the reverse direction of the bidirectional DC power supply.

[0035] Further, when determining the first fluctuation coefficient of the forward current, as an alternative embodiment of the present invention, calculate the first average value of the first ratios between the first current data at adjacent moments; determine the maximum value of the first differences from the first difference sequence; determine the first product of the first average value and the maximum value of the first differences as the first fluctuation coefficient.

[0036] Specifically, in the embodiment of the present invention, the following formula is used to calculate the first fluctuation coefficient:

[0037]

[0038] In the above formula, is the first fluctuation coefficient of the forward current in the positive test direction. i is the number of moments, n is the total number of moments, and n is a natural number greater than or equal to 2. is the first current data monitored at moment i of the forward current in the positive test direction. is the first current data monitored at moment i + 1 of the forward current in the positive test direction. is the ratio between the first current data at adjacent moments. It is the average value of the ratio of the first current data changes at adjacent moments in the first monitoring period, indicating the fluctuation state of the current. It is the maximum value of the first difference between the first current data at adjacent moments, which is used as a reference coefficient to reduce randomness. Indicates the first fluctuation coefficient of the forward current in the positive test direction. The larger the value, the more violent the current fluctuation state, and vice versa.

[0039] Further, when determining the second fluctuation coefficient of the forward voltage in the positive test direction, as an optional embodiment of the present invention, the second average value of the second ratio between the first voltage data at each adjacent moment is calculated; the maximum value of the second difference is determined from the second difference sequence; and the second product of the second average value and the maximum value of the second difference is determined as the second fluctuation coefficient.

[0040] Specifically, the embodiment of the present invention specifically uses the following formula to calculate the second fluctuation coefficient:

[0041]

[0042] In the above formula, is the second fluctuation coefficient of the forward voltage in the positive test direction. i is the time number, n is the total number of time, and n is a natural number greater than or equal to 2. The first voltage data monitored at time i of the forward voltage in the positive test direction. The first voltage data monitored at time i+1 is the forward voltage in the positive test direction. is the ratio between the first voltage data at adjacent moments. It is the average value of the ratio of the first voltage data changes at adjacent moments in the first monitoring period, indicating the voltage fluctuation state. The maximum value of the second difference between the first voltage data at adjacent moments is used as a reference coefficient to reduce randomness. Indicates the second fluctuation coefficient of the forward voltage in the positive test direction. The larger the value, the more violent the voltage fluctuation state, and vice versa.

[0043] Furthermore, in a high-temperature test environment, each component inside the bidirectional DC power supply will experience a temperature rise phenomenon, resulting in an increase in the resistance of electronic components, which in turn affects the stability of the voltage and current during the operation of the bidirectional DC power supply. Therefore, in the embodiments of the present invention, the stability parameters within the monitoring period are obtained by comparing the fluctuation coefficients of the current and voltage. As an alternative embodiment of the present invention, first, calculate the third ratio between the first fluctuation coefficient and the second fluctuation coefficient, and the absolute value of the third difference between the third ratio and the preset value; then calculate the fourth ratio between the maximum current value and the maximum voltage value, and calculate the third product between the absolute value of the third difference and the fourth ratio; finally, perform normalization processing on the third product to obtain the first stability parameter.

[0044] Specifically, in the embodiments of the present invention, the preset value can be taken as 1, and the following formula is specifically used in the embodiments of the present invention to calculate the first stability parameter:

[0045]

[0046] In the above formula, is the first stability parameter of the first monitoring period. is the first fluctuation coefficient of the forward current in the positive test direction. is the second fluctuation coefficient of the forward voltage in the positive test direction. is the difference value between the first fluctuation coefficient of the forward current, the second fluctuation coefficient of the forward voltage and 1, indicating the fluctuation similarity of the current and voltage. The closer this value is to 0, the higher the similarity, and vice versa. is the maximum current value within the first monitoring period. is the maximum voltage value within the first monitoring period. is the ratio of the maximum current value and the maximum voltage value, serving as an influence factor for similarity to reduce the difference. represents the first stability parameter of the first monitoring period. The smaller the value, the smaller the fluctuation degree, and vice versa. represents the derivative function of the softsign function. Use the derivative function of the softsign function to perform normalization processing, so that when has a value of 0, and when the value is larger, is smaller, and vice versa. The higher the stability of the first monitoring period.

[0047] Furthermore, in order to reduce the subsequent calculation amount, in the embodiments of the present invention, a predetermined threshold is set to 0.6. When When the monitoring period is relatively stable, the subsequent steps of the embodiment of the present invention are continued; otherwise, it is unstable, and the aging test result of the bidirectional DC power supply is directly obtained, and the subsequent processing of the embodiment of the present invention is not performed.

[0048] S103. Determine the switching duration when the bidirectional DC power supply performs cycle switching according to the termination detection time of the first monitoring cycle and the start detection time of the second monitoring cycle.

[0049] Specifically, when switching the state of the bidirectional DC power supply, due to the increase in the resistance value caused by the temperature rise of electronic components in the high-temperature test environment, the current steering efficiency during the switching process is affected. Moreover, after the steering, the current, voltage, etc. will fluctuate, exacerbating the reduction of the current steering efficiency, and further affecting the stability of the bidirectional DC power supply. The current switching efficiency of the bidirectional DC power supply and the output stability of related parameters such as the current after switching determine the overall performance state parameters of the detection device. Therefore, in the embodiment of the present invention, the current switching efficiency is obtained by the change coefficient of the current switching duration during the monitoring process and the time change parameter of the related parameters such as the current from the conversion fluctuation to the stable state after the current switching is completed. The higher the efficiency, the more stable the bidirectional DC power supply; otherwise, it is unstable.

[0050] Further, in the embodiment of the present invention, the switching duration of each current switching is obtained according to the detection time data detected by the current sensor during the conversion. In the embodiment of the present invention, the formula is used for calculation, where is the switching duration from the th monitoring cycle to the th monitoring cycle, is the number of the monitoring cycle, is the termination detection time of the monitoring cycle , is the start detection time of the monitoring cycle .

[0051] Further, in the embodiment of the present invention, the change state parameter can also be obtained by the ratio of the switching durations of adjacent monitoring cycles:

[0052]

[0053] In the above formula, is the change duration state parameter, is the monitoring cycle number, , are the switching durations of adjacent monitoring cycles respectively. is the difference value of the ratio of the switching durations of adjacent monitoring cycles to 1. The larger this value is, the greater the difference value; otherwise, the difference value is smaller.

[0054] S104. Determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after periodic switching according to the second current data and the second voltage data at adjacent moments.

[0055] Specifically, when the current is switched, the current direction changes, which in turn causes instantaneous peak phenomena in the current, voltage, etc. Subsequently, it takes a period of time to transition to a stable state. The shorter the transition time, the more stable the bidirectional DC power supply as a whole, and vice versa. Therefore, when analyzing the switching duration, it is necessary to consider the transition duration ratio of the current, voltage, etc. from the instantaneous peak to the steady state.

[0056] Further, when determining the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after periodic switching, as an optional embodiment of the present invention, first calculate the third difference sequence of the fourth differences between the second current data at adjacent moments in the second monitoring period, the fourth difference sequence of the fifth differences between the second voltage data at adjacent moments, the fifth ratio between the second current data at adjacent moments, and the sixth ratio between the second voltage data at adjacent moments; then determine the third fluctuation coefficient of the bidirectional DC power supply after switching according to the third difference sequence and the fifth ratio, and determine the fourth fluctuation coefficient of the bidirectional DC power supply after switching according to the fourth difference sequence and the sixth ratio; secondly, determine the first recovery duration of the bidirectional DC power supply from the current fluctuation state to the stable state after switching according to the third fluctuation coefficient and determine the second recovery duration of the bidirectional DC power supply from the voltage fluctuation state to the stable state after switching according to the fourth fluctuation coefficient; and determine the second stability parameter of the second monitoring period according to the third fluctuation coefficient, the fourth fluctuation coefficient, the maximum current value and the maximum voltage value in the second monitoring period; finally, determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after switching based on the first recovery duration, the second recovery duration and the second stability parameter.

[0057] Specifically, after the current direction is switched, from the positive to the negative , in the embodiment of the present invention, for the current data after the current switching, obtain the third difference sequence of the fourth differences between the second current data at adjacent moments in the second monitoring period. In the embodiment of the present invention, the third difference sequence is denoted as . represents the fourth difference between the second current data between adjacent moments i and i + 1 in the second monitoring period.

[0058] Further, when determining the third fluctuation coefficient of the bidirectional DC power supply after switching, as an alternative embodiment of the present invention, first select the maximum value of the fourth difference from the third difference sequence; calculate the reciprocal of the absolute value of the sixth difference between the fifth ratio and the preset value, and calculate the fourth product between the reciprocal of the absolute value of the sixth difference and the maximum value of the fourth difference; perform normalization processing on the fourth product to obtain the third fluctuation coefficient.

[0059] Specifically, the embodiment of the present invention uses the following formula to calculate the third fluctuation coefficient:

[0060]

[0061] In the above formula, is the third fluctuation coefficient of the bidirectional DC power supply after switching. is the second current data at the current detection time i in the reverse direction. is the second current data at the current detection time i + 1 in the reverse direction. is the maximum value of the fourth difference selected from the third difference sequence. represents the normalization function, which is used to perform normalization processing on

[0062] Further, when determining the fourth fluctuation coefficient of the bidirectional DC power supply after switching, as an alternative embodiment of the present invention, first select the maximum value of the fifth difference from the fourth difference sequence; then calculate the reciprocal of the absolute value of the seventh difference between the sixth ratio and the preset value, and calculate the fifth product between the reciprocal of the absolute value of the seventh difference and the maximum value of the fifth difference; finally, perform normalization processing on the fifth product to obtain the fourth fluctuation coefficient.

[0063] Specifically, the embodiment of the present invention specifically uses the following formula to calculate the fourth fluctuation coefficient:

[0064]

[0065] In the above formula, is the fourth fluctuation coefficient of the bidirectional DC power supply after switching. is the second voltage data at the voltage detection time i in the reverse direction. is the second voltage data at the voltage detection time i + 1 in the reverse direction. is the maximum value of the fifth difference selected from the fourth difference sequence. represents the normalization function, which is used to perform normalization processing on

[0066] Further, when determining the first recovery duration and the second recovery duration, the embodiment of the present invention sets a duration threshold. In the embodiment of the present invention, the duration threshold is set to 0.2. When​​ When it is, the current fluctuation is relatively large, otherwise it is relatively small. Obtain Mark the moment when it is, then this moment is the current fluctuation termination moment, and obtain the first recovery duration . The first recovery duration can be the difference between the current fluctuation termination moment and the initial moment when the current is switched. When it is, the voltage fluctuation is relatively large, otherwise it is relatively small. Obtain Mark the moment when it is, then this moment is the voltage fluctuation termination moment, and obtain the second recovery duration . The second recovery duration can be the difference between the voltage fluctuation termination moment and the initial moment when the current is switched.

[0067] Furthermore, the embodiment of the present invention calculates the second stability parameter of the second monitoring period by using the following formula:

[0068]

[0069] In the above formula, represents the second stability parameter of the second monitoring period. is the fourth fluctuation coefficient of the bidirectional DC power supply after switching. is the third fluctuation coefficient of the bidirectional DC power supply after switching. represents the maximum current value within the second monitoring period. represents the maximum voltage value within the second monitoring period. represents the derivative function of the softsign function, and the derivative function of the softsign function is used to perform normalization processing.

[0070] Furthermore, the embodiment of the present invention obtains the similarity between the voltage fluctuation and the current fluctuation according to the time change of the recovery period after the current is switched. As an optional embodiment of the present invention, first calculate the reciprocal of the absolute value of the eighth difference between the first recovery duration and the second recovery duration; then determine that the sixth product of the reciprocal of the absolute value of the eighth difference and the second stability parameter is the similarity.

[0071] Specifically, the embodiment of the present invention specifically calculates the similarity by using the following formula:

[0072]

[0073] In the above formula, is the similarity between the current fluctuation and the voltage fluctuation after the bidirectional DC power supply is switched in the jth monitoring period. is the number of the monitoring period. is the first recovery duration. is the second recovery duration. is the ratio of the difference value between the first recovery duration of the current and the second recovery duration of the voltage to 1. The larger the difference value, the smaller the ratio and the lower the similarity. is the second stability parameter of the j-th monitoring period.

[0074] S105. Determine the first quantity of the monitoring periods in a stable state when the bidirectional DC power supply performs current switching according to the first stability parameter, the switching duration, and the similarity.

[0075] Specifically, in the embodiment of the present invention, it is determined whether the bidirectional DC power supply is in a stable state when performing current switching according to the first stability parameter, the switching duration, and the similarity. As an optional embodiment of the present invention, first, determine the stable state recovery index when the bidirectional DC power supply performs current switching after the completion of the first monitoring period according to the first stability parameter, the switching duration, and the similarity; then determine the change coefficient between the stable state recovery indexes in adjacent monitoring periods according to the stable state recovery indexes of adjacent monitoring periods; then determine the influence parameter that affects the stability of the bidirectional DC power supply during current switching according to the change coefficient and the switching duration of adjacent monitoring periods; secondly, perform normalization processing on the influence parameter using the inverse min-max function to obtain a normalized value; finally, mark the monitoring periods with the normalized value greater than the threshold to obtain the first quantity of the monitoring periods in a stable state when the bidirectional DC power supply performs current switching.

[0076] Specifically, the embodiment of the present invention specifically calculates the stable state recovery index when performing current switching after the completion of the first monitoring period using the following formula:

[0077]

[0078] In the above formula, is the stable state recovery index of the bidirectional DC power supply when performing current switching after the completion of the monitoring period j. is the similarity between the current fluctuation and the voltage fluctuation after switching in the j-th monitoring period of the bidirectional DC power supply. is the switching duration when performing current switching in the j-th monitoring period. is the first stability parameter of the monitoring period j. is the difference value between the similarity between the current fluctuation and the voltage fluctuation after switching in the monitoring period and the first stability parameter of the monitoring period j, which represents the influence change state of the monitoring period switching on the current and voltage parameters. The larger this value, the worse the recovery state of the monitoring period, and vice versa. is the ratio of the influence change state to the current switching duration and 1. The larger this value, the better the recovery effect, and vice versa. Use the sigmoid function for Perform normalization processing.

[0079] Furthermore, the bidirectional DC power supply can quickly pass through the failure period after aging test treatment, so that the product enters a relatively stable long-term accidental failure period. And during the test of the bidirectional DC power supply, the influence of current switching on the stability of the detection parameters of the bidirectional DC power supply needs to be considered. In the embodiment of the present invention, the steady-state recovery index between the two monitoring periods before and after current switching is obtained through the above embodiment . As the monitoring period increases, the influence degree of current switching on the bidirectional DC power supply gradually tends to be stable, that is, the steady-state recovery index gradually approaches. Therefore, in the embodiment of the present invention, the change coefficient between the steady-state recovery indexes within adjacent monitoring periods is determined according to the steady-state recovery indexes of adjacent monitoring periods. That is, the change coefficient between the steady-state recovery indexes within adjacent monitoring periods is calculated by the following formula :

[0080]

[0081] In the above formula, represents the change coefficient between the steady-state recovery indexes within adjacent monitoring periods. is the steady-state recovery index of the bidirectional DC power supply when current switching is performed after the completion of monitoring period j. is the steady-state recovery index of the bidirectional DC power supply when current switching is performed after the completion of monitoring period j + 1. represents the maximum-minimum normalization function, which is used to perform normalization processing on Perform normalization processing.

[0082] Furthermore, the switching duration of the current is an important parameter affecting the conversion of the current direction of the bidirectional DC power supply. Therefore, when obtaining the overall influence parameter of current switching on current change, the change difference parameter of the current switching duration is used as an influence factor. In the embodiment of the present invention, the following formula is specifically used to calculate the influence parameter that affects the stability of the bidirectional DC power supply during current switching:

[0083]

[0084] In the above formula, is the influence parameter that affects the stability of the bidirectional DC power supply during current switching. is the monitoring period. is the change coefficient between the steady-state recovery indexes between adjacent monitoring periods j and j + 1. is the switching duration of the jth monitoring period. is the switching duration of the (j + 1)-th monitoring period. is the difference value between the ratio of the switching durations in adjacent monitoring periods and 1. The closer the value is to 0, the better the stable state, and vice versa.

[0085] Furthermore, use the reverse min-max function to perform normalization processing to obtain the normalized value , such that the smaller the value of the larger the value of . The above threshold in the embodiments of the present invention can be determined according to actual situations, and the value in the embodiments of the present invention is 0.6. When , the bidirectional DC power supply state is stable under adjacent current switching operations, and the monitoring period in this stable state is marked. Otherwise, it is not marked, and the first quantity of the monitoring periods in the stable state during current switching is counted .

[0086] S106, determine the aging test result of the bidirectional DC power supply according to the second quantity and the first quantity of the total monitoring periods of the bidirectional DC power supply.

[0087] Specifically, when the bidirectional DC power supply is in a stable state for a long time during operation, the bidirectional DC power supply has passed the early failure period and entered a relatively stable long-term accidental failure period. Therefore, by analyzing the proportion of the duration of the continuous stable stage during the aging test of the bidirectional DC power supply in the overall detection, the proportion is obtained to determine whether the bidirectional DC power supply has completed the aging test.

[0088] Furthermore, as an optional embodiment of the present invention, first determine the stable proportion coefficient of the bidirectional DC power supply according to the second quantity and the first quantity of the total monitoring periods of the bidirectional DC power supply; then determine the aging test result of the bidirectional DC power supply according to the stable proportion coefficient.

[0089] Specifically, the embodiments of the present invention specifically calculate the stable proportion coefficient using the following formula:

[0090]

[0091] In the above formula, is the stable proportion coefficient of the bidirectional DC power supply. is the first quantity of the monitoring periods in the stable state when the bidirectional DC power supply performs current switching. is the second quantity of the total monitoring periods of the bidirectional DC power supply. is the ratio between the first quantity of the monitoring periods in the stable state of the bidirectional DC power supply and the second quantity of the total monitoring periods. The larger this value is, the longer the stable state duration of the bidirectional DC power supply, and vice versa.

[0092] Further, in the embodiments of the present invention, a test threshold is set, and the test threshold can be determined according to actual conditions. In the embodiments of the present invention, the value is 0.5. When this is the case, it is determined that the aging test result of the bidirectional DC power supply enters the relatively stable long-term accidental failure period, and the aging test is completed. If then the test continues.

[0093] It should be noted that during the aging test process, when the monitored data of the bidirectional DC power supply exceeds the safety threshold set by the test staff, the test status is abnormal, the test product is unqualified, the aging test is stopped, and the test product is replaced for re-detection.

[0094] In the embodiments of the present invention, by monitoring the voltage data and current data of the bidirectional DC power supply in the positive and negative directions, the stability of the bidirectional DC power supply when switching the current in a high-temperature environment, the switching duration during periodic switching, and the similarity between the current fluctuation and voltage fluctuation during periodic switching are obtained. Finally, based on the stability, switching duration, and similarity, the number of monitoring periods in a stable state when the bidirectional DC power supply is switched is determined, so as to obtain the aging test result of the bidirectional DC power supply. Therefore, in the embodiments of the present invention, the influence of the high-temperature environment on the switching efficiency is considered when the bidirectional DC power supply is switched, the difference between the aging test result of the bidirectional DC power supply and the actual situation is reduced, and the accuracy of the aging test result of the bidirectional DC power supply is improved.

[0095] Embodiment 2:

[0096] Based on the DC power supply aging test method provided in the above embodiments, and based on the same technical concept, the embodiments of the present invention also provide a DC power supply aging test device. Figure 2 The structural schematic diagram of a DC power supply aging test device provided for an embodiment of the present invention is as Figure 2As shown in the figure. The DC power supply aging test device 200 includes: an acquisition module 201, configured to acquire monitoring data during the aging test of the bidirectional DC power supply in a high-temperature environment, where the monitoring data includes first current data and first voltage data of the bidirectional DC power supply during a first monitoring period in the positive direction, and second current data and second voltage data of the bidirectional DC power supply during a second monitoring period in the reverse direction; a determination module 202, configured to determine a first stability parameter of the first monitoring period according to the first current data and the first voltage data at each adjacent moment; the determination module 202 is further configured to determine the switching duration when the bidirectional DC power supply performs a period switch according to the termination detection moment of the first monitoring period and the start detection moment of the second monitoring period; the determination module 202 is further configured to determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after the period switch according to the second current data and the second voltage data at each adjacent moment; the determination module 202 is further configured to determine a first number of monitoring periods in a stable state when the bidirectional DC power supply performs a current switch according to the first stability parameter, the switching duration, and the similarity; the determination module 202 is further configured to determine the aging test result of the bidirectional DC power supply according to the second number of the total monitoring periods of the bidirectional DC power supply and the first number.

[0097] In the embodiment of the present invention, by monitoring the voltage data and current data of the bidirectional DC power supply in the positive and reverse directions, the stability when the bidirectional DC power supply performs a current switch in a high-temperature environment, the switching duration when performing a period switch, and the similarity between the current fluctuation and the voltage fluctuation when performing a period switch are obtained. Finally, based on the stability, the switching duration, and the similarity, the number of monitoring periods in a stable state when the bidirectional DC power supply performs a switch is determined, so as to obtain the aging test result of the bidirectional DC power supply. Therefore, the embodiment of the present invention considers the influence of the high-temperature environment on the switching efficiency when the bidirectional DC power supply switches, reduces the difference between the aging test result of the bidirectional DC power supply and the actual situation, and improves the accuracy of the aging test result of the bidirectional DC power supply.

[0098] Embodiment 3:

[0099] Corresponding to the DC power supply aging test method provided in the above embodiment, based on the same technical concept, the embodiment of the present invention further provides a DC power supply aging test system, which is used to execute the above DC power supply aging test method. Figure 3 The structural schematic diagram of a DC power supply aging test system provided by another embodiment of the present invention is shown in Figure 3As shown. The DC power supply aging test system can vary greatly due to different configurations or performances, and may include one or more processors 301 and a memory 302. The memory 302 is used to store computer programs that can run on the processor 301. The processor 301 is used to execute the programs stored on the memory 302 to implement the above Figure 1 each step in the method embodiments. Among them, the memory 302 can be transient storage or persistent storage. The application programs stored in the memory 302 can include one or more modules (not shown in the figure), and each module can include a series of computer-executable instructions for the DC power supply aging test system.

[0100] Furthermore, the processor 301 can be set to communicate with the memory 302 and execute a series of computer-executable instructions in the memory 302 on the DC power supply aging test system. The DC power supply aging test system can also include one or more power supplies 303, one or more wired or wireless network interfaces 304, one or more input / output interfaces 305, and one or more keyboards 306.

[0101] Specifically in this embodiment, the DC power supply aging test system includes a processor, a communication interface, a memory, and a communication bus; among them, the processor, the communication interface, and the memory complete mutual communication through the bus; the memory is used to store computer programs; the processor is used to execute the programs stored on the memory to implement the above Figure 1 each step in the method embodiments, and has the beneficial effects of the above method embodiments. To avoid repetition, the embodiments of the present invention will not be described in detail here.

[0102] It should be noted that the DC power supply aging test system provided in the embodiments of the present invention and the DC power supply aging test method provided in the embodiments of the present invention are based on the same application concept. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned DC power supply aging test method and has the same or similar beneficial effects. The repeated parts will not be described again.

[0103] It should be noted that the above order of the embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be beneficial.

[0104] Each embodiment in this specification is described in a progressive manner. The same or similar parts between each embodiment can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

Claims

1. A DC power supply aging test method, characterized in that: The DC power supply aging test method comprises: Acquire monitoring data during an aging test of a bidirectional DC power supply in a high temperature environment, the monitoring data comprising first current data and first voltage data of the bidirectional DC power supply in a first monitoring cycle in a forward direction, and second current data and second voltage data of the bidirectional DC power supply in a second monitoring cycle in a reverse direction; Determine a first stability parameter of the first monitoring period according to first current data and first voltage data at each adjacent moment; Determining a switching duration when the bidirectional direct current power supply performs period switching according to the termination detection time of the first monitoring cycle and the start detection time of the second monitoring cycle; Determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional direct current power supply after periodic switching according to the second current data and the second voltage data at each adjacent moment; Determining a first number of monitoring cycles in which the bidirectional direct current power supply is in a stable state when performing current switching according to the first stability parameter, the switching duration, and the similarity; Determine an aging test result of the bidirectional direct current power supply according to a second number of total monitoring cycles of the bidirectional direct current power supply and the first number; Determining the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after periodic switching according to the second current data and the second voltage data at each adjacent moment includes: Calculate a third difference sequence of fourth differences between second current data at adjacent moments in the second monitoring period, a fourth difference sequence of fifth differences between second voltage data at adjacent moments, a fifth ratio between second current data at adjacent moments, and a sixth ratio between second voltage data at adjacent moments; determining a third fluctuation coefficient of the bidirectional direct current power supply after switching according to the third difference sequence and the fifth ratio, and determining a fourth fluctuation coefficient of the bidirectional direct current power supply after switching according to the fourth difference sequence and the sixth ratio; Determine a first recovery time of the bidirectional DC power supply from a current fluctuation state to a stable state after switching according to the third fluctuation coefficient, and determine a second recovery time of the bidirectional DC power supply from a voltage fluctuation state to a stable state after switching according to the fourth fluctuation coefficient; Determine a second stability parameter of the second monitoring period according to the third fluctuation coefficient, the fourth fluctuation coefficient, the maximum current value and the maximum voltage value in the second monitoring period; Determine similarity between current fluctuation and voltage fluctuation of the bidirectional direct current power supply after switching based on the first recovery time, the second recovery time and the second stability parameter; Determining the first number of monitoring cycles in which the bidirectional DC power supply is in a stable state when performing current switching according to the first stability parameter, the switching duration, and the similarity includes: Determine, according to the first stability parameter, the switching duration and the similarity, a stable state recovery index of the bidirectional direct current power supply when current switching is performed after the first monitoring cycle is completed; Determining, according to the stable state recovery indexes of adjacent monitoring periods, a coefficient of variation between the stable state recovery indexes within the adjacent monitoring periods; Determining, according to the variation coefficient and the switching duration of the adjacent monitoring cycles, an influencing parameter of the bidirectional direct current power supply that affects the stability of the bidirectional direct current power supply when the current is switched; Using an inverse min-max function to normalize the influencing parameter to obtain a normalized value; The monitoring periods in which the normalized value is greater than a threshold value are marked to obtain a first number of monitoring periods in which the bidirectional direct current power supply is in a stable state when performing current switching.

2. The DC power supply aging test method according to claim 1, characterized in that: The determining of the first stability parameter of the first monitoring period according to the first current data and the first voltage data at each adjacent moment comprises: Calculate a first difference sequence of first differences between first current data at adjacent moments in the first monitoring period, a second difference sequence of second differences between first voltage data at adjacent moments, a first ratio between first current data at adjacent moments, and a second ratio between first voltage data at adjacent moments; Determine a first fluctuation coefficient of a forward current in a positive test direction according to the first difference sequence and the first ratio, and determine a second fluctuation coefficient of a forward voltage in the positive test direction according to the second difference sequence and the second ratio; A first stability parameter of the first monitoring period is determined by using the first fluctuation coefficient, the second fluctuation coefficient, a maximum current value, and a maximum voltage value in the first monitoring period.

3. The DC power supply aging test method according to claim 2, characterized in that: The step of determining the first fluctuation coefficient of the forward current in the positive test direction according to the first difference sequence and the first ratio comprises: Calculate a first average value of first ratios between first current data at adjacent moments; Determine a maximum value of first difference values ​​from the first difference value sequence; Determine a first product of the first average value and the maximum value of the first difference as the first fluctuation coefficient; Determining the second fluctuation coefficient of the forward voltage in the positive test direction according to the second difference sequence and the second ratio comprises: Calculate a second average value of second ratios between first voltage data at adjacent moments; Determining a maximum value of second difference values ​​from the second difference value sequence; A second product of the second average value and the maximum value of the second difference is determined as the second fluctuation coefficient.

4. The DC power supply aging test method according to claim 2, characterized in that: The determining of the first stability parameter of the first monitoring period by using the first fluctuation coefficient, the second fluctuation coefficient, the maximum current value and the maximum voltage value in the first monitoring period comprises: Calculating a third ratio between the first fluctuation coefficient and the second fluctuation coefficient, and an absolute value of a third difference between the third ratio and a preset value; calculating a fourth ratio between the maximum current value and the maximum voltage value, and calculating a third product between the absolute value of the third difference and the fourth ratio; The third product is normalized to obtain the first stability parameter.

5. The DC power supply aging test method according to claim 1, characterized in that: Determining the third fluctuation coefficient of the bidirectional direct current power supply after switching according to the third difference sequence and the fifth ratio includes: Selecting the maximum value of the fourth difference from the third difference sequence; calculating the reciprocal of the absolute value of a sixth difference between the fifth ratio and the preset value, and calculating a fourth product between the reciprocal of the absolute value of the sixth difference and the maximum value of the fourth difference; Normalizing the fourth product to obtain the third fluctuation coefficient; Determining a fourth fluctuation coefficient of the bidirectional direct current power supply after switching according to the fourth difference sequence and the sixth ratio includes: Selecting the maximum value of the fifth difference from the fourth difference sequence; calculating the reciprocal of the absolute value of a seventh difference between the sixth ratio and a preset value, and calculating a fifth product between the reciprocal of the absolute value of the seventh difference and the maximum value of the fifth difference; The fifth product is normalized to obtain the fourth fluctuation coefficient.

6. The DC power supply aging test method according to claim 1, characterized in that: The determining, based on the first recovery time, the second recovery time, and the second stability parameter, the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after switching comprises: Calculate the reciprocal of the absolute value of an eighth difference between the first recovery time length and the second recovery time length; A sixth product between the inverse of the absolute value of the eighth difference and the second stability parameter is determined as the similarity.

7. A DC power supply aging test device, characterized in that: include: An acquisition module, used to acquire monitoring data of a bidirectional DC power supply during an aging test in a high temperature environment, wherein the monitoring data includes first current data and first voltage data of the bidirectional DC power supply in a first monitoring cycle in a positive direction, and second current data and second voltage data of the bidirectional DC power supply in a second monitoring cycle in a reverse direction; A determination module, configured to determine a first stability parameter of the first monitoring period according to first current data and first voltage data at adjacent moments; The determination module is further used to determine the switching duration of the bidirectional direct current power supply when performing period switching according to the termination detection time of the first monitoring cycle and the start detection time of the second monitoring cycle; The determination module is further used to determine the similarity between the current fluctuation and the voltage fluctuation of the bidirectional direct current power supply after periodic switching according to the second current data and the second voltage data at each adjacent moment; The determination module is further used to determine a first number of monitoring cycles in which the bidirectional direct current power supply is in a stable state when performing current switching according to the first stability parameter, the switching duration and the similarity; The determination module is further configured to determine an aging test result of the bidirectional DC power supply according to a second number of total monitoring cycles of the bidirectional DC power supply and the first number; Determining the similarity between the current fluctuation and the voltage fluctuation of the bidirectional DC power supply after periodic switching according to the second current data and the second voltage data at each adjacent moment includes: Calculate a third difference sequence of fourth differences between second current data at adjacent moments in the second monitoring period, a fourth difference sequence of fifth differences between second voltage data at adjacent moments, a fifth ratio between second current data at adjacent moments, and a sixth ratio between second voltage data at adjacent moments; determining a third fluctuation coefficient of the bidirectional direct current power supply after switching according to the third difference sequence and the fifth ratio, and determining a fourth fluctuation coefficient of the bidirectional direct current power supply after switching according to the fourth difference sequence and the sixth ratio; Determine a first recovery time of the bidirectional DC power supply from a current fluctuation state to a stable state after switching according to the third fluctuation coefficient, and determine a second recovery time of the bidirectional DC power supply from a voltage fluctuation state to a stable state after switching according to the fourth fluctuation coefficient; Determine a second stability parameter of the second monitoring period according to the third fluctuation coefficient, the fourth fluctuation coefficient, the maximum current value and the maximum voltage value in the second monitoring period; Determine similarity between current fluctuation and voltage fluctuation of the bidirectional direct current power supply after switching based on the first recovery time, the second recovery time and the second stability parameter; Determining the first number of monitoring cycles in which the bidirectional DC power supply is in a stable state when performing current switching according to the first stability parameter, the switching duration, and the similarity includes: Determine, according to the first stability parameter, the switching duration and the similarity, a stable state recovery index of the bidirectional direct current power supply when current switching is performed after the first monitoring cycle is completed; Determining, according to the stable state recovery indexes of adjacent monitoring periods, a coefficient of variation between the stable state recovery indexes within the adjacent monitoring periods; Determining, according to the variation coefficient and the switching duration of the adjacent monitoring cycles, an influencing parameter of the bidirectional direct current power supply that affects the stability of the bidirectional direct current power supply when the current is switched; Using an inverse min-max function to normalize the influencing parameter to obtain a normalized value; The monitoring periods in which the normalized value is greater than a threshold value are marked to obtain a first number of monitoring periods in which the bidirectional direct current power supply is in a stable state when performing current switching.

8. A DC power supply aging test system, characterized in that: include: A processor and a memory; wherein the memory is used to store a computer program that can be run on the processor; A processor is used to execute the program stored in the memory to implement the steps of the DC power supply aging test method as described in any one of claims 1 to 6.

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