Diode Diagnostic Methods and Devices for High-Power Rectifiers

Abstract

This invention discloses a diode diagnostic method and apparatus for high-power rectifiers. The method includes: during the pre-charging process of the high-power rectifier, acquiring the three-phase AC current signals of the input line; statistically analyzing the comparison results of each phase AC current signal with zero; analyzing the conduction count of each diode in the high-power rectifier based on the comparison results; and determining whether all diodes are functioning normally based on the conduction count of each diode. This invention can perform diode diagnostics on high-power rectifiers, accurately predict changes in external environmental parameters, and avoid major failures such as equipment damage.

Description

Technical Field

[0001] This invention relates to the field of rectifier technology, and more particularly to diode diagnostic methods and apparatus for high-power rectifiers. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] A high-power rectifier is a rectifier used to handle large currents. High-power rectified power supplies require rectifiers with large current capacity, high breakdown voltage, and good heat dissipation. However, these devices have large junction areas and large junction capacitances, resulting in very low operating frequencies, typically below tens of kilohertz. In the two basic types of rectifiers based on high-power diodes or thyristors, the high-voltage AC power from the power grid is converted into DC power. Other future types of rectifiers are mentioned: choppers based on cutting-edge uncontrolled diode products, chopper DC / DC converters, or current-source inverter active rectifiers. Clearly, this latest type of rectifier involves considerable technical development, but it offers advantages such as very low harmonic interference and a power factor of 1 when applied to the power grid.

[0004] Existing diode diagnostic solutions rely on waiting for pre-charge timeouts or repeatedly pre-charging and closing the circuit to fully charge the DC bus voltage before proceeding to the next step. This lack of identification and assessment of critical parameters makes it impossible to accurately predict changes in external environmental parameters, potentially leading to serious malfunctions such as equipment damage. Furthermore, assessing the diode status at different stages can result in discontinuous current signals and excessively small current amplitudes, leading to incorrect diode status determinations.

[0005] Therefore, it is necessary to propose a new diode diagnostic scheme for high-power rectifiers to accurately predict changes in external environmental parameters and achieve accurate diode diagnosis for high-power rectifiers. Summary of the Invention

[0006] This invention provides a diode diagnostic method for high-power rectifiers, used to accurately predict changes in external environmental parameters and perform diode diagnostics on high-power rectifiers. The method includes:

[0007] During the pre-charging process of the high-power rectifier, the three-phase AC current signal of the high-power rectifier's input line is collected;

[0008] The results of comparing the AC current signal of each phase of the three-phase incoming line with the zero value are statistically analyzed.

[0009] Based on the comparison with zero, analyze the number of times each diode in the high-power rectifier conducts.

[0010] Determine whether all diodes are working properly based on the number of times each diode conducts.

[0011] This invention provides a diode diagnostic device for a high-power rectifier, used to accurately predict changes in external environmental parameters and perform diode diagnostics on the high-power rectifier. The device includes:

[0012] The current signal acquisition module is used to acquire the three-phase AC current signal of the input line of the high-power rectifier during the pre-charging process of the high-power rectifier.

[0013] The statistics module is used to calculate the results of comparing the AC current signal of each phase of the incoming three-phase AC current signal with the zero value;

[0014] The conduction count analysis module is used to analyze the conduction count of each diode in a high-power rectifier based on the comparison with zero value.

[0015] The diode detection module is used to determine whether each diode is working properly based on the number of times each diode conducts.

[0016] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the diode diagnostic method for the high-power rectifier described above.

[0017] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the diode diagnostic method for the high-power rectifier described above.

[0018] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the diode diagnostic method for the high-power rectifier described above.

[0019] In this embodiment of the invention, during the pre-charging process of a high-power rectifier, the three-phase AC current signal of the high-power rectifier's input line is collected; the result of comparing the AC current signal of each phase of the input three-phase AC current signal with zero is statistically analyzed; based on the result of the comparison with zero, the conduction count of each diode in the high-power rectifier is analyzed; and based on the conduction count of each diode, it is determined whether all diodes are working properly. This embodiment of the invention accurately predicts the problem of diode malfunction caused by changes in the external parameter of DC bus voltage. This is mainly achieved by predicting changes in DC bus voltage, collecting the three-phase AC current signal of the high-power rectifier's input line, comparing it with zero, and obtaining the result of the comparison with zero. This allows for accurate analysis of the conduction count of each diode, thereby determining whether all diodes are working properly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of a diode diagnostic method for a high-power rectifier in an embodiment of the present invention;

[0022] Figure 2 Circuit diagram for the pre-charging process of an existing high-power rectifier;

[0023] Figure 3 This is a schematic diagram of the DC bus voltage in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the input three-phase AC current signal of the high-power rectifier in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the input three-phase AC current signal of another high-power rectifier in an embodiment of the present invention;

[0026] Figure 6 This is a structural diagram of the diode diagnostic device for a high-power rectifier in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the computer device structure according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0029] To perform diode diagnostics on high-power rectifiers and accurately predict changes in the external environmental parameter of DC bus voltage, this invention provides a diode diagnostic method for high-power rectifiers, such as... Figure 1 As shown, the method may include:

[0030] Step 101: During the pre-charging process of the high-power rectifier, the three-phase AC current signal of the high-power rectifier's input line is collected;

[0031] Step 102: Calculate the results of comparing the AC current signal of each phase of the incoming three-phase AC current signal with the zero value;

[0032] Step 103: Based on the comparison with zero, analyze the number of times each diode in the high-power rectifier conducts.

[0033] Step 104: Determine whether all diodes are working properly based on the number of times each diode conducts.

[0034] Depend on Figure 1 As shown, during the pre-charging process of the high-power rectifier, the three-phase AC current signals of the high-power rectifier's input line are collected; the results of comparing each phase AC current signal with zero are statistically analyzed; based on the results of the comparison with zero, the conduction count of each diode in the high-power rectifier is analyzed; and based on the conduction count of each diode, it is determined whether all diodes are working properly. This embodiment of the invention accurately predicts the problem of diode malfunction caused by changes in the external parameter of the DC bus voltage. This is mainly achieved by predicting changes in the DC bus voltage, collecting the three-phase AC current signals of the high-power rectifier's input line, comparing them with zero, and obtaining the comparison results. This allows for accurate analysis of the conduction count of each diode, thereby determining whether all diodes are working properly.

[0035] Figure 2The circuit diagram for the pre-charging process of an existing high-power rectifier is shown. After receiving a closing command, the three-phase contactor Sw of the pre-charging circuit engages, and the three-phase moving contacts gradually approach the three-phase stationary contacts. Once the moving and stationary contacts are fully in contact, the contactor engagement is complete. Because the moving contacts of the three-phase contactor Sw cannot move completely synchronously during the engagement process, some moving contacts may contact the stationary contacts first. When the first two moving and stationary contacts close, a single-phase full-bridge rectifier circuit is formed, enabling the charging of the DC capacitor. When all three moving and stationary contacts are closed, a three-phase full-bridge rectifier circuit is formed, enabling simultaneous charging of the DC capacitor by all three phases. Assuming that the moving and stationary contacts of phases U and V make contact first, forming a single-phase full-bridge rectifier circuit, the charging current I flows through the moving contact 1 and stationary contact 2 of the three-phase contactor Sw, through the pre-charging resistor Ru, the input reactor L11, and the diode D1 of the insulated-gate bipolar transistor IGBT to the positive DC bus, charging the DC capacitors C1 to C3. Then, after passing through the diode D4 of the insulated-gate bipolar transistor IGBT, the input reactor L12, and the pre-charging resistor Rv, it passes through the stationary contact 4 and moving contact 3 of the three-phase contactor Sw, forming a complete closed current loop between phases U and V.

[0036] Since the amplitude of the three-phase AC voltage is different at each moment, the closing of the three-phase contactor Sw at different times will result in different charging currents for the DC capacitor, different charging processes for the DC bus voltage, and different power consumption on the pre-charging resistors Ru, Rv, and Rw.

[0037] Once the three-phase contactor Sw is fully closed, the complete three-phase full-bridge rectification process begins, with the DC bus voltage gradually increasing and the three-phase current gradually decreasing.

[0038] The following is a detailed analysis of each step.

[0039] In one embodiment, the method further includes:

[0040] The actual value of the DC bus voltage is collected every preset time interval (e.g., 1ms);

[0041] The actual value is compared with the rated voltage of the high-power rectifier to determine whether the high-power rectifier is in the pre-charging process.

[0042] Figure 3 This is a schematic diagram of the DC bus voltage in an embodiment of the present invention. In one embodiment, comparing the actual value with the rated voltage of the high-power rectifier to determine whether the high-power rectifier is in a pre-charging process includes:

[0043] When the actual value is less than 2% of the rated voltage of the high-power rectifier, the high-power rectifier is determined to enter the pre-charging process.

[0044] When the actual value reaches 85% of the rated voltage of the high-power rectifier, the high-power rectifier is considered to have completed the pre-charging process.

[0045] This condition allows for the rapid identification of the pre-charging process.

[0046] In step 101, during the pre-charging process of the high-power rectifier, the three-phase AC current signal of the high-power rectifier's input line is acquired; Figure 4 This is a schematic diagram of the incoming three-phase AC current signal in an embodiment of the present invention.

[0047] In step 102, the results of comparing the AC current signal of each phase of the incoming three-phase AC current signal with zero are statistically analyzed; in one embodiment, before statistically analyzing the results of comparing the AC current signal of each phase of the incoming three-phase AC current signal with zero, the method further includes:

[0048] The portion of the incoming three-phase AC current signal that exceeds a preset ratio is extracted to obtain the signal to be analyzed.

[0049] The results of comparing the AC current signal of each phase of the three-phase incoming line with zero are statistically analyzed, including:

[0050] The results of comparing the AC current signal of each phase in the signal to be analyzed with zero are statistically analyzed.

[0051] In this embodiment of the invention, the preset ratio is 2% of the rated current of the high-power rectifier. This is because of the deviation in analog sampling, current signals less than 2% of the rated current are easily interfered with by external factors and cannot accurately reflect the actual signal. Therefore, only signals greater than 2% of the rated current are analyzed. Figure 4 In this context, Iu represents the current flowing into the device from phase U of the power grid; Iv represents the current flowing into the device from phase V of the power grid; and Iw represents the current flowing into the device from phase W of the power grid.

[0052] A value greater than zero indicates that current flows from phase U through diode D1 to the positive DC bus, while a value less than zero indicates that current flows from the negative DC bus through diode D2 to phase U.

[0053] A value greater than zero indicates that current flows from phase V through diode D3 to the positive DC bus, while a value less than zero indicates that current flows from the negative DC bus through diode D4 to phase V.

[0054] Iw greater than zero indicates that current flows from phase W through diode D5 to the positive DC bus, and Iw less than zero indicates that current flows from the negative DC bus through diode D6 to phase W.

[0055] In one embodiment, the statistical comparison of the AC current signal of each phase in the signal to be analyzed with zero includes:

[0056] Statistically count the first occurrence of positive values ​​and the second occurrence of negative values ​​in each phase of the AC current signal in the signal to be analyzed;

[0057] Based on the comparison with zero, the conduction frequency of each diode in the high-power rectifier is analyzed, including:

[0058] Based on the first and second counts, analyze the conduction counts of each diode in the high-power rectifier.

[0059] By counting the first and second times, the conduction count of each diode in a high-power rectifier can be analyzed very quickly, improving the efficiency of diode fault diagnosis.

[0060] In step 104, based on the comparison with zero, the conduction count of each diode in the high-power rectifier is analyzed. Due to factors such as the closing time of the pre-charge contactor and the voltage phase, the conduction counts of D1 to D6 are not exactly the same, so they need to be processed in subsequent judgments.

[0061] In step 105, based on the number of times each diode conducts, it is determined whether all diodes are working properly.

[0062] In one embodiment, determining whether all diodes are functioning correctly based on the number of times each diode has been turned on includes:

[0063] Calculate the average number of conduction cycles for all diodes;

[0064] The deviation of the conduction count of each diode from the average value is less than 3, confirming that all diodes are working properly.

[0065] Otherwise, it indicates that the electrical characteristics of the diode have changed, and the corresponding diode needs to be checked for electrical characteristics.

[0066] The introduction of average values ​​can quickly determine whether a diode is working properly, thus improving the efficiency of diode fault diagnosis.

[0067] In one embodiment, the device further includes:

[0068] Once it is determined that all diodes are not functioning properly, an electrical characteristic checklist is generated to facilitate inspection by staff.

[0069] The following is a specific embodiment to illustrate the specific application of the method proposed in this invention.

[0070] Taking the pre-charging process of a high-power rectifier device as an example, during the pre-charging process, the actual value of the DC bus voltage is collected and recorded every 1ms to determine whether the pre-charging process has begun. (See [link to relevant documentation]). Figure 3Then, during the pre-charging process, the three-phase AC current signal of the high-power rectifier's input line is acquired, see... Figure 5 The portion of the three-phase AC current signal exceeding 2% of the rated current of the high-power rectifier is extracted to obtain the signal to be analyzed. The results of comparing each phase AC current signal with zero are statistically analyzed, including the first and second counts. The conduction counts of each diode in the high-power rectifier are then analyzed, as shown in Table 1. From Table 1, the first and second counts of Iu, Iv, and Iw can be statistically determined. Then, the conduction counts of each diode D1 to D6 are analyzed. In Table 1, a value of 1 for D1 to D6 represents conduction, and a value of 0 represents non-conduction.

[0071] Table 1

[0072]

[0073]

[0074]

[0075]

[0076]

[0077] Based on the number of times the diodes conduct, determine whether all diodes are working properly.

[0078] In summary, the method proposed in this embodiment of the invention involves acquiring the three-phase AC current signal of the high-power rectifier's input line during the pre-charging process; statistically analyzing the comparison result of each phase AC current signal with zero; analyzing the conduction count of each diode in the high-power rectifier based on the comparison result; and determining whether all diodes are functioning normally based on the conduction count of each diode. This embodiment of the invention accurately predicts the problem of diode malfunction caused by changes in the external parameter of the DC bus voltage. This is mainly achieved by predicting changes in the DC bus voltage, acquiring the three-phase AC current signal of the high-power rectifier's input line, comparing it with zero, and obtaining the comparison result. This allows for accurate analysis of the conduction count of each diode, thereby determining whether all diodes are functioning normally.

[0079] Based on the same inventive concept, embodiments of the present invention also provide a diode diagnostic device for a high-power rectifier, as described in the following embodiments. Since the principles of these problem-solving methods are similar to those of the diode diagnostic method for a high-power rectifier, the implementation of the diode diagnostic device for a high-power rectifier can be referred to the implementation of the method, and repeated details will not be elaborated further.

[0080] Figure 6This is a structural diagram of the diode diagnostic device for a high-power rectifier in an embodiment of the present invention, as shown below. Figure 6 As shown, the diode diagnostic device for this high-power rectifier includes:

[0081] The current signal acquisition module 601 is used to acquire the three-phase AC current signal of the input line of the high-power rectifier during the pre-charging process of the high-power rectifier.

[0082] The statistics module 602 is used to statistically analyze the results of comparing the AC current signal of each phase of the incoming three-phase AC current signal with the zero value.

[0083] The conduction count analysis module 603 is used to analyze the conduction count of each diode in a high-power rectifier based on the result of comparison with zero value;

[0084] The diode detection module 604 is used to determine whether each diode is working properly based on the number of times each diode conducts.

[0085] In one embodiment, the statistics module is further configured to:

[0086] Before comparing the results of each phase AC current signal with zero in the statistical analysis of the incoming three-phase AC current signal, the portion of the incoming three-phase AC current signal that is greater than a preset proportion is extracted to obtain the signal to be analyzed.

[0087] The results of comparing the AC current signal of each phase in the signal to be analyzed with zero are statistically analyzed.

[0088] In one embodiment, the statistics module is specifically used for:

[0089] Statistically count the first number of times the AC current signal of each phase in the signal to be analyzed is greater than zero and the second number of times it is less than zero.

[0090] In one embodiment, the conduction count analysis module is specifically used for:

[0091] Based on the first and second counts, analyze the conduction counts of each diode in the high-power rectifier.

[0092] In one embodiment, the diode detection module is specifically used for:

[0093] Calculate the average number of conduction cycles for all diodes;

[0094] The deviation of the conduction count of each diode from the average value is less than 3, confirming that all diodes are working properly.

[0095] In one embodiment, the device further includes a pre-charging process determination module 605, used for:

[0096] The actual value of the DC bus voltage is collected every preset time interval;

[0097] The actual value is compared with the rated voltage of the high-power rectifier to determine whether the high-power rectifier is in the pre-charging process.

[0098] In one embodiment, the pre-charging process determination module 605 is specifically used for:

[0099] When the actual value is less than 2% of the rated voltage of the high-power rectifier, the high-power rectifier is determined to enter the pre-charging process.

[0100] When the actual value reaches 85% of the rated voltage of the high-power rectifier, the high-power rectifier is considered to have completed the pre-charging process.

[0101] In one embodiment, the preset ratio is 2% of the rated current of the high-power rectifier.

[0102] In one embodiment, the diode detection module is further configured to:

[0103] Once it is determined that all diodes are not functioning properly, an electrical characteristic checklist is generated.

[0104] In summary, the device proposed in this embodiment of the invention collects the three-phase AC current signal of the high-power rectifier during the pre-charging process; it statistically analyzes the comparison result of each phase AC current signal with zero; based on the comparison result with zero, it analyzes the conduction count of each diode in the high-power rectifier; and based on the conduction count of each diode, it determines whether all diodes are working properly. This embodiment of the invention accurately predicts the problem of diode malfunction caused by changes in the external parameter of the DC bus voltage. This is mainly achieved by predicting changes in the DC bus voltage, collecting the three-phase AC current signal of the high-power rectifier's input, comparing it with zero, and obtaining the comparison result. This allows for accurate analysis of the conduction count of each diode, thereby determining whether all diodes are working properly.

[0105] Based on the aforementioned inventive concept, such as Figure 7 As shown, this embodiment of the invention also provides a computer device 700, including a memory 710, a processor 720, and a computer program 730 stored in the memory 710 and executable on the processor 720. When the processor 720 executes the computer program 730, it implements the diode diagnostic method for the high-power rectifier described above.

[0106] Based on the foregoing inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the diode diagnostic method for the high-power rectifier described above.

[0107] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the diode diagnostic method for the high-power rectifier described above.

[0108] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0109] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0110] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0111] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0112] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of diagnosing diodes of a high-power rectifier, characterized in that, The method comprises the following steps: During the pre-charging process of the high-power rectifier, the incoming three-phase alternating current signals of the high-power rectifier are collected; The results of comparison with zero value in each phase of the incoming three-phase alternating current signals are counted; According to the results of comparison with zero value, the number of conduction of each diode in the high-power rectifier is analyzed; According to the number of conduction of each diode, it is determined whether all diodes are working normally; Before counting the results of comparison with zero value in each phase of the incoming three-phase alternating current signals, the part of the incoming three-phase alternating current signals greater than a preset proportion is intercepted to obtain a signal to be analyzed; The results of comparison with zero value in each phase of the signal to be analyzed are counted; The results of comparison with zero value in each phase of the signal to be analyzed are counted, which comprises counting the first number of values greater than zero and the second number of values less than zero in each phase of the signal to be analyzed; According to the results of comparison with zero value, the number of conduction of each diode in the high-power rectifier is analyzed, which comprises analyzing the number of conduction of each diode in the high-power rectifier according to the first number and the second number.

2. The method of claim 1, wherein, According to the number of conduction of each diode, it is determined whether all diodes are working normally, which comprises: The average value of the number of conduction of all diodes is calculated; If the deviation of the number of conduction of each diode from the average value is less than 3, it is determined that all diodes are working normally.

3. The method of claim 1, wherein, Further comprising: The actual value of the DC bus voltage is collected every preset time length; The actual value is compared with the rated voltage of the high-power rectifier to determine whether the high-power rectifier is in the pre-charging process.

4. The method of claim 3, wherein, The actual value is compared with the rated voltage of the high-power rectifier to determine whether the high-power rectifier is in the pre-charging process, which comprises: When the actual value is less than 2% of the rated voltage of the high-power rectifier, it is determined that the high-power rectifier enters the pre-charging process; When the actual value reaches 85% of the rated voltage of the high-power rectifier, it is determined that the high-power rectifier completes the pre-charging process.

5. The method of claim 1, wherein, The preset proportion is 2% of the rated current of the high-power rectifier.

6. The method of claim 1, wherein, Further comprising: When it is determined that all diodes are not working normally, an electrical characteristic check sheet is generated.

7. A diode diagnostic device for high power rectifiers, characterized by The method comprises the following steps: The current signal collection module is configured to collect the incoming three-phase alternating current signals of the high-power rectifier during the pre-charging process of the high-power rectifier; The counting module is configured to count the results of comparison with zero value in each phase of the incoming three-phase alternating current signals; The number of conduction analysis module is configured to analyze the number of conduction of each diode in the high-power rectifier according to the results of comparison with zero value; The diode judgment module is configured to determine whether each diode is working normally according to the number of conduction of each diode; The counting module is further configured to: Before counting the results of comparison with zero value in each phase of the incoming three-phase alternating current signals, the part of the incoming three-phase alternating current signals greater than a preset proportion is intercepted to obtain a signal to be analyzed; The results of comparison with zero value in each phase of the signal to be analyzed are counted; The counting module is specifically configured to: counting a first number of times of signals greater than zero and a second number of times of signals less than zero in each phase of the AC current signal to be analyzed; The on-time analysis module is specifically configured to: According to the first number and the second number, analyze the on-time of each diode in the high-power rectifier.

8. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the method in any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method in any one of claims 1 to 6.

10. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is executed by the processor to implement the method in any one of claims 1 to 6.

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