A method, system and related device for suppressing AC-DC switching surge current of a high-power power supply

Abstract

The application provides a high-power power supply AC-DC switch surge current suppression method and system and related equipment, and relates to the technical field of switching power supplies. The method comprises the following steps: after the power supply system is powered on, parameters are initialized to obtain surge current suppression parameters, and the nth AC-DC power module in the N AC-DC power modules is started; the total input current on the AC input bus of the power supply system is monitored in real time, and the following operations are executed in a loop until the N AC-DC power modules are all started: it is determined whether the nth AC-DC power module enters a steady-state running state; in the case that it is determined that the nth AC-DC power module has entered the steady-state running state and n is less than N, it is determined whether the n AC-DC power modules enter the steady-state running state; in the case that it is determined that the n AC-DC power modules have all entered the steady-state running state, a cooperative suppression operation is performed on the n+1th AC-DC power module in the N AC-DC power modules according to the surge current suppression parameters, so as to start the n+1th AC-DC power module.

Description

A method, system, and related equipment for suppressing surge current in high-power AC-DC switching power supplies. Technical Field

[0001] This application relates to the field of switching power supply technology, and in particular to a method, system and related equipment for suppressing surge current in a high-power AC-DC switching power supply. Background Technology

[0002] With the rapid development of data centers, industrial equipment, and new energy fields, surge current suppression in high-power power supply systems plays an increasingly important role in ensuring stable system operation, improving equipment safety, and extending service life. Especially in high-power power supply systems composed of multiple AC-DC power modules, the rectifier and filter circuits at the input terminals of each AC-DC power module cause a sharp increase in capacitor charging current at the moment of power-on, generating a surge current several times the rated current. When multiple AC-DC power modules start simultaneously, the surge currents of each module linearly superimpose, easily exceeding the instantaneous current carrying capacity of the upstream AC power distribution system, causing upstream protection to trip, and resulting in the failure of the entire high-power power supply system to power on.

[0003] In related technologies, to suppress inrush current during power-up of high-power power supply systems, single-module surge suppression and fixed-delay sequential power-up strategies are commonly employed. Specifically, the single-module surge suppression method involves adding a soft-start circuit to the input of a single AC-DC power module to limit the rate of increase of the capacitor charging current, or connecting an NTC thermistor in series at the front end of the rectifier and filter circuit of a single AC-DC power module. The negative temperature characteristic of the NTC thermistor results in a high resistance value when cold, thereby reducing the peak surge current of the single AC-DC power module. The fixed-delay sequential power-up strategy avoids the linear superposition of inrush currents caused by multiple AC-DC power modules being powered on simultaneously by pre-setting the startup time interval for each AC-DC power module.

[0004] However, using the above method, the single-module surge suppression method can only reduce the peak surge current of a single AC-DC power module. When multiple AC-DC power modules are started, the surge currents of each AC-DC power module will still be superimposed. The delay time of the fixed delay sequence power-on strategy needs to be preset based on experience. If the delay is too short, there is a risk of the total current exceeding the limit. If the delay is too long, it will excessively prolong the startup time of the high-power power supply system, thus making it difficult for related technologies to simultaneously achieve both surge current suppression effect and startup efficiency of the high-power power supply system. Summary of the Invention

[0005] This application provides a method, system, and related equipment for suppressing surge current in a high-power AC-DC switch, which aims to balance the surge current suppression effect and startup efficiency of a high-power power supply system.

[0006] In a first aspect, this application provides a method for suppressing surge current in a high-power AC-DC switch, applied to the aforementioned high-power AC-DC switch surge current suppression system. The method includes: after the power system is powered on, parameter initialization is performed to obtain surge current suppression parameters, and the nth AC-DC power module out of N AC-DC power modules is started, where N and n are both positive integers; the total input current on the AC input bus of the power system is monitored in real time, and the following operations are performed cyclically until all N AC-DC power modules have been started: determining whether the nth AC-DC power module has entered a steady-state operating state; if the nth AC-DC power module has entered a steady-state operating state and n is less than N, determining whether all n AC-DC power modules have entered a steady-state operating state; if all n AC-DC power modules have entered a steady-state operating state, performing a coordinated suppression operation on the (n+1)th AC-DC power module out of the N AC-DC power modules according to the surge current suppression parameters to start the (n+1)th AC-DC power module.

[0007] By adopting the above technical solution, after the power system is powered on, parameter initialization is performed to obtain surge current suppression parameters. The first AC-DC power module is then started. Real-time monitoring of the total input current on the AC input bus of the power system ensures that all currently started AC-DC power modules have entered a steady-state operating state. Then, based on the surge current suppression parameters, a coordinated suppression operation is performed to determine whether to start the next AC-DC power module. This achieves dynamic sequential start-up control based on real-time current monitoring, ensuring that the peak surge current times of each AC-DC power module are staggered, avoiding the superposition of surge currents caused by the simultaneous start-up of multiple AC-DC power modules. Furthermore, because a real-time monitoring and dynamic judgment mechanism is used instead of a fixed delay, subsequent AC-DC power modules can be started in the shortest possible time interval while ensuring safety. This solves the technical problem in related technologies of simultaneously achieving both surge current suppression and start-up efficiency in high-power power systems, achieving the technical effect of simultaneously achieving both surge current suppression and start-up efficiency in high-power power systems.

[0008] Optionally, determining whether the nth AC-DC power module has entered a steady-state operating state specifically includes: sampling the total input current waveform over multiple consecutive AC cycles to obtain multiple current waveform amplitudes; performing fluctuation characteristic analysis on the multiple current waveform amplitudes to obtain amplitude fluctuation characteristic values; comparing the amplitude fluctuation characteristic values ​​with a preset fluctuation threshold to obtain a stability comparison result; sorting the multiple current waveform amplitudes in descending order to obtain a current waveform amplitude sequence; comparing the current waveform amplitude at the top of the current waveform amplitude sequence with a preset surge current threshold to obtain a surge characteristic judgment result; and determining whether the nth AC-DC power module has entered a steady-state operating state based on the stability comparison result and the surge characteristic judgment result.

[0009] By adopting the above technical solution, and by sampling the waveform of the total input current and performing fluctuation characteristic analysis over multiple consecutive AC cycles, it is possible to accurately determine whether the total input current tends to stabilize. Simultaneously, by comparing the maximum value in the current waveform amplitude sequence with a preset surge current threshold, it is possible to determine whether surge characteristics still exist. Based on the comprehensive judgment of the stability comparison results and surge characteristic judgment results, it is possible to accurately identify whether the AC-DC power module has completed the startup process and entered a steady-state operation, providing a reliable basis for the startup timing decision of subsequent AC-DC power modules and avoiding the superposition of surge currents caused by starting the next AC-DC power module before the previous AC-DC power module has stabilized.

[0010] Optionally, the determination of whether the nth AC-DC power module has entered steady-state operation is based on the stability comparison results and surge characteristic judgment results. Specifically, this includes: if the amplitude fluctuation characteristic value is less than the preset fluctuation threshold as determined by the stability comparison results, determining that the total input current is in a stable state over multiple AC cycles; if the amplitude of the first current waveform is less than the preset surge current threshold as determined by the surge characteristic judgment results, determining that the waveform of the total input current over multiple AC cycles does not have surge characteristics; and if the total input current is in a stable state over multiple AC cycles and the waveform of the total input current over multiple AC cycles does not have surge characteristics, determining that the nth AC-DC power module has entered steady-state operation.

[0011] By adopting the above technical solution, the total input current is determined to be stable by the amplitude fluctuation characteristic value being less than the preset fluctuation threshold, and the absence of surge characteristics is determined by the maximum current waveform amplitude being less than the preset surge current threshold. Only when both conditions of current stabilization and absence of surge characteristics are met simultaneously is the AC-DC power module determined to have entered steady-state operation. This dual judgment mechanism can effectively avoid erroneous start-up decisions caused by misjudgment due to a single judgment condition, and improve the accuracy and reliability of steady-state judgment.

[0012] Optionally, if it is determined that all n AC-DC power modules have entered a steady-state operating state, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among the N AC-DC power modules according to the surge current suppression parameters to start the (n+1)th AC-DC power module. Specifically, this includes: obtaining the current steady-state total current of the n AC-DC power modules; and performing a coordinated suppression operation on the (n+1)th AC-DC power module among the N AC-DC power modules according to the current steady-state total current and the surge current suppression parameters to start the (n+1)th AC-DC power module.

[0013] By adopting the above technical solution, before starting the next AC-DC power module, the current steady-state total current of the n currently started AC-DC power modules is obtained. Based on the current steady-state total current and surge current suppression parameters, a coordinated suppression operation is performed. This enables dynamic decision-making on the start-up timing of subsequent AC-DC power modules according to the real-time operating status of the power system, achieving system-level coordinated control and ensuring that the peak value of the total input current of the power system does not exceed the carrying capacity of the upstream power supply network when starting subsequent AC-DC power modules.

[0014] Optional surge current suppression parameters include the maximum instantaneous current threshold allowed by the power supply network of the power system, the peak surge current of a single AC-DC power module at startup, and a preset safety margin.

[0015] By adopting the above technical solution, the surge current suppression parameters include three key parameters: maximum instantaneous current threshold, peak surge current at startup, and preset safety margin. The maximum instantaneous current threshold represents the instantaneous current carrying capacity of the upstream power supply network, the peak surge current at startup represents the magnitude of the surge current generated when a single AC-DC power module starts up, and the preset safety margin is used to compensate for uncertainties caused by factors such as current sampling errors, component tolerances, and dynamic load changes. Based on the above three parameters, it is possible to accurately predict whether the peak current after starting subsequent AC-DC power modules will exceed the safety limit, providing a complete parameter basis for coordinated suppression operation.

[0016] Optionally, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among the N AC-DC power modules based on the current steady-state total current and surge current suppression parameters to start the (n+1)th AC-DC power module. Specifically, this includes: determining the target current peak value based on the current steady-state total current and the peak value of the startup surge current; determining the peak value of the startup total current based on the target current peak value and a preset safety margin; performing a safety margin comparison analysis between the peak value of the startup total current and the maximum instantaneous current threshold to obtain a safety margin comparison result; and if the peak value of the startup total current is determined to be less than the maximum instantaneous current threshold based on the safety margin comparison result, sending a startup command to the (n+1)th AC-DC power module to power it on.

[0017] By adopting the above technical solution, the target current peak value is determined based on the sum of the current steady-state total current and the peak value of the starting surge current. Then, a preset safety margin is added to obtain the peak value of the starting total current. Finally, the peak value of the starting total current is compared with the maximum instantaneous current threshold. Only when the peak value of the starting total current is less than the maximum instantaneous current threshold is a start command sent to the next AC-DC power module. This predictive safety judgment mechanism can confirm that the current over-limit will not occur before startup, fundamentally eliminating the risk of the upstream protection being activated due to the superposition of surge current, and ensuring the safety and reliability of the power supply system during the power-on process.

[0018] Optionally, the above method further includes: if the peak value of the total startup current is determined to be greater than or equal to the maximum instantaneous current threshold based on the safety margin comparison result, the startup command is not sent; the total input current of the power system is monitored in real time, and the cooperative suppression operation is re-executed on the (n+1)th AC-DC power module until the peak value of the total startup current is less than the maximum instantaneous current threshold.

[0019] By adopting the above technical solution, when the predicted peak value of the total starting current is greater than or equal to the maximum instantaneous current threshold, the starting command is not sent temporarily. Instead, the total input current is monitored in real time and the cooperative suppression operation is re-executed until the peak value of the total starting current meets the safety conditions. This dynamic waiting mechanism can adapt to the load changes of the power system. When the load of the already running AC-DC power module is large, resulting in a high current in the current steady state, the starting of the subsequent AC-DC power module is automatically delayed. The module is started after the load decreases or the current stabilizes, thus ensuring the safe power-on of the power system under any operating conditions.

[0020] Secondly, embodiments of this application provide a high-power AC-DC switching surge current suppression system, which includes: one or more processors and a memory; the memory is coupled to one or more processors, and the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the high-power AC-DC switching surge current suppression system to perform the method described in the first aspect and any possible implementation thereof.

[0021] Thirdly, embodiments of this application provide a computer program product containing instructions that, when the computer program product is run on a high-power AC-DC switching surge current suppression system, cause the high-power AC-DC switching surge current suppression system to perform the method described in the first aspect and any possible implementation thereof.

[0022] Fourthly, embodiments of this application provide a computer-readable storage medium including instructions that, when executed on a high-power AC-DC switching surge current suppression system, cause the high-power AC-DC switching surge current suppression system to perform the method described in the first aspect and any possible implementation thereof.

[0023] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0024] 1. This application takes the perspective of the entire power system, monitors the total input current on the AC input bus in real time, and dynamically decides the start-up timing of each AC-DC power module based on this. It intelligently staggers the surge current occurrence time of each AC-DC power module, realizes system-level surge current collaborative suppression, and ensures that the peak value of the total input current of the power system is always lower than the maximum instantaneous current threshold allowed by the upstream power supply network. This fundamentally solves the problem of surge current superposition caused by the simultaneous start-up of multiple AC-DC power modules.

[0025] 2. This application is based on a dynamic decision-making mechanism of real-time current monitoring, which enables the startup strategy to adapt to the load conditions of the already running AC-DC power modules. Before starting the subsequent AC-DC power modules, it predicts whether the current peak will exceed the safety limit. Only when it is confirmed to be safe will the startup command be sent, ensuring that starting a new AC-DC power module under any operating condition will not cause electrical overstress, thus ensuring high safety.

[0026] 3. Under the premise of ensuring safety, this application finds the earliest safe start-up opportunity through real-time monitoring and dynamic judgment mechanism. Compared with the fixed delay sequence power-on strategy, it does not need to reserve too large a safety margin, which can significantly shorten the overall time from power-on to the completion of startup of all AC-DC power modules and improve the startup efficiency of the power system. Attached Figure Description

[0027] Figure 1 is a flowchart illustrating a method for suppressing surge current of a high-power AC-DC switch in an embodiment of this application.

[0028] Figure 2 is a schematic diagram of a hardware architecture of a high-power AC-DC switching surge current suppression system in an embodiment of this application.

[0029] Figure 3 is a flowchart illustrating a suppression strategy in an embodiment of this application;

[0030] Figure 4 is a schematic diagram comparing the total input current waveform of the power system under the time-sharing cooperative start-up and the traditional simultaneous start-up modes in the embodiments of this application;

[0031] Figure 5 is a schematic diagram of the physical device structure of a high-power AC-DC switch surge current suppression system in an embodiment of this application. Detailed Implementation

[0032] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to any or all possible combinations including one or more of the listed items.

[0033] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0034] This application provides a method for suppressing surge current in a high-power AC-DC switch. Referring to Figure 1, Figure 1 is a schematic flowchart of a method for suppressing surge current in a high-power AC-DC switch according to an embodiment of this application, including the following steps:

[0035] Step S101: After the power system is powered on, perform parameter initialization to obtain surge current suppression parameters, and start the nth AC-DC power module among the N AC-DC power modules, where N and n are both positive integers;

[0036] Step S102: Monitor the total input current on the AC input bus of the power system in real time, and perform the following operations in a loop until all N AC-DC power modules have started up: Determine whether the nth AC-DC power module has entered a steady-state operating state;

[0037] Step S103: If it is determined that the nth AC-DC power module has entered a steady-state operating state and n is less than N, determine whether the n AC-DC power modules have entered a steady-state operating state.

[0038] Step S104: After determining that all n AC-DC power modules have entered steady-state operation, perform a coordinated suppression operation on the (n+1)th AC-DC power module among the N AC-DC power modules according to the surge current suppression parameter, so as to start the (n+1)th AC-DC power module.

[0039] In the above embodiment, the power system includes N AC-DC power modules, where N is a positive integer, such as 4, 8, 12, etc. After the power system is powered on, parameter initialization is performed first to obtain surge current suppression parameters. These surge current suppression parameters are used in subsequent coordinated suppression operations to determine whether to allow the next AC-DC power module to be started. After parameter initialization is completed, the first AC-DC power module among the N AC-DC power modules (i.e., n=1) is started. Subsequently, the total input current on the AC input bus of the power system is monitored in real time. This total input current is the sum of the input currents of all started AC-DC power modules. During real-time monitoring, steady-state judgment and coordinated suppression operations are executed cyclically: First, it is determined whether the nth AC-DC power module that has just started has entered a steady-state operating state; if the nth AC-DC power module has entered a steady-state operating state and n is less than N (i.e. there are still AC-DC power modules that have not started), then it is further determined whether all n AC-DC power modules that have started are in a steady-state operating state. This step is used to eliminate the possibility that the previously stable AC-DC power modules will fluctuate again due to load changes or other reasons; after determining that all n AC-DC power modules have entered a steady-state operating state, a coordinated suppression operation is performed on the (n+1)th AC-DC power module according to the surge current suppression parameters. If the safety conditions are met, the (n+1)th AC-DC power module is started, and n is updated to n+1, and the next cycle continues until all N AC-DC power modules have started.

[0040] Through the above steps, after the power system is powered on, parameter initialization is performed to obtain surge current suppression parameters. The first AC-DC power module is then started. By monitoring the total input current on the AC input bus of the power system in real time, and confirming that all currently started AC-DC power modules have entered a steady-state operating state, a coordinated suppression operation is performed based on the surge current suppression parameters to determine whether to start the next AC-DC power module. This achieves dynamic sequential start-up control based on real-time current monitoring, ensuring that the surge current peak times of each AC-DC power module are staggered, avoiding the superposition of surge currents caused by the simultaneous start-up of multiple AC-DC power modules. Furthermore, because a real-time monitoring and dynamic judgment mechanism is used instead of a fixed delay, subsequent AC-DC power modules can be started in the shortest possible time interval while ensuring safety. This solves the technical problem in related technologies of simultaneously achieving both surge current suppression and start-up efficiency in high-power power systems, achieving the technical effect of simultaneously achieving both surge current suppression and start-up efficiency in high-power power systems.

[0041] The entity performing the above steps may be a system or device, or a controller or processor in the device or system, or a separate controller or processor, or other processing devices or processing units with similar processing functions, but is not limited to these.

[0042] In an optional embodiment, determining whether the nth AC-DC power module has entered a steady-state operating state specifically includes: sampling the total input current waveform over multiple consecutive AC cycles to obtain multiple current waveform amplitudes; performing fluctuation characteristic analysis on the multiple current waveform amplitudes to obtain amplitude fluctuation characteristic values; performing stability comparison analysis on the amplitude fluctuation characteristic values ​​and a preset fluctuation threshold to obtain a stability comparison result; sorting the multiple current waveform amplitudes in descending order to obtain a current waveform amplitude sequence; performing surge characteristic comparison analysis on the current waveform amplitude value at the top of the current waveform amplitude sequence and a preset surge current threshold to obtain a surge characteristic judgment result; and determining whether the nth AC-DC power module has entered a steady-state operating state based on the stability comparison result and the surge characteristic judgment result.

[0043] The preset fluctuation threshold needs to be determined based on the actual operating conditions of the power system and the characteristics of the AC-DC power module. In a specific embodiment, the preset fluctuation threshold can be set to 5% to 15% of the rated input current of the AC-DC power module. For example, when the rated input current of the AC-DC power module is 10A, the preset fluctuation threshold can be set to 0.5A to 1.5A. A preset fluctuation threshold that is too small will lead to overly strict steady-state judgment, prolonging the startup time; a preset fluctuation threshold that is too large will lead to a steady-state determination before the AC-DC power module has fully stabilized, posing a safety risk. The preset surge current threshold needs to be determined based on the peak value of the startup surge current of a single AC-DC power module. In a specific embodiment, the preset surge current threshold can be set to 1.2 to 1.5 times the peak value of the startup surge current of a single AC-DC power module, or to 2 to 3 times the steady-state operating current of the AC-DC power module. For example, when the peak inrush current of a single AC-DC power module is 30A and the steady-state operating current is 10A, the preset inrush current threshold can be set to 36A to 45A, or to 20A to 30A. When the maximum current waveform amplitude within the sampling window exceeds the preset inrush current threshold, it indicates that the AC-DC power module is still in the inrush phase and has not yet entered the steady-state operating state.

[0044] In the above embodiments, steady-state operation refers to the operating state where the input current of the AC-DC power module tends to be stable and no longer exhibits surge characteristics after the AC-DC power module completes the startup process. To accurately determine whether the nth AC-DC power module has entered steady-state operation, the total input current on the AC input bus is sampled over multiple consecutive AC cycles (e.g., 5 to 10 consecutive AC cycles). The amplitude of the current waveform in each AC cycle (i.e., the peak or effective value of the current in that cycle) is obtained, resulting in multiple current waveform amplitudes. Then, fluctuation characteristic analysis is performed on the multiple current waveform amplitudes to calculate amplitude fluctuation characteristic values. These amplitude fluctuation characteristic values ​​can be characterized using statistical measures such as the variance, standard deviation, or range of the multiple current waveform amplitudes. The amplitude fluctuation characteristic values ​​are compared with a preset fluctuation threshold to obtain a stability comparison result, which is used to determine whether the total input current tends to be stable. Simultaneously, multiple current waveform amplitudes are sorted in descending order to obtain a current waveform amplitude sequence. The current waveform amplitude at the top of the sequence (i.e., the maximum current waveform amplitude) is compared with a preset surge current threshold to obtain a surge characteristic judgment result, which is used to determine whether surge current characteristics exist within the sampling window. Finally, by combining the stability comparison result and the surge characteristic judgment result, it is determined whether the nth AC-DC power module has entered a steady-state operation state.

[0045] In an optional embodiment, determining whether the nth AC-DC power module has entered a steady-state operation state based on the stability comparison result and the surge characteristic judgment result specifically includes: if the amplitude fluctuation characteristic value is less than a preset fluctuation threshold as determined by the stability comparison result, determining that the total input current is in a stable state over multiple AC cycles; if the amplitude of the first current waveform is less than a preset surge current threshold as determined by the surge characteristic judgment result, determining that the waveform of the total input current over multiple AC cycles does not have surge characteristics; and if the total input current is in a stable state over multiple AC cycles and the waveform of the total input current over multiple AC cycles does not have surge characteristics, determining that the nth AC-DC power module has entered a steady-state operation state.

[0046] In the above embodiments, the steady-state operation is determined using a dual-condition mechanism: First, based on the stability comparison results, if the amplitude fluctuation characteristic value is less than a preset fluctuation threshold, it indicates that the total input current fluctuates less over multiple AC cycles, and the current tends to stabilize. Second, based on the surge characteristic judgment results, if the amplitude of the current waveform at the beginning of the current waveform amplitude sequence (i.e., the maximum current amplitude within the sampling window) is less than a preset surge current threshold, it indicates that there are no obvious surge current spikes within the sampling window. Only when both conditions are met—that the total input current is tending to stabilize and that there are no surge characteristics—is the nth AC-DC power module determined to have entered a steady-state operation. This dual-judgment mechanism effectively distinguishes between the start-up transition process and the steady-state operation process of the AC-DC power module, avoiding misjudgments that may occur due to a single-condition judgment. For example, when the AC-DC power module has just completed surge charging but the output has not yet stabilized, although there may be no surge characteristics, the current fluctuation is still relatively large; or when there is a periodic load disturbance, although the current is generally stable, occasional current spikes may occur. By comprehensively judging the dual conditions, the accuracy of steady-state judgment can be improved.

[0047] In an optional embodiment, after determining that all n AC-DC power modules have entered a steady-state operating state, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among the N AC-DC power modules according to the surge current suppression parameters to start the (n+1)th AC-DC power module. Specifically, this includes: obtaining the current steady-state total current of the n AC-DC power modules; and performing a coordinated suppression operation on the (n+1)th AC-DC power module among the N AC-DC power modules according to the current steady-state total current and the surge current suppression parameters to start the (n+1)th AC-DC power module.

[0048] In the above embodiments, the coordinated suppression operation refers to performing a safety assessment based on the real-time operating status of the power system and surge current suppression parameters before starting subsequent AC-DC power modules. Startup is only permitted if safety is confirmed. Specifically, the current steady-state total current of the n currently started AC-DC power modules is first obtained. This current steady-state total current can be obtained by sampling the total input current and taking the average or effective value during the steady-state period. Specifically, after determining that the nth AC-DC power module has entered steady-state operation, the total input current on the AC input bus is continuously sampled. The sampling time window can be set to 2 to 5 AC cycles. Then, the root mean square (RMS) value or arithmetic mean of the total input current within this sampling time window is calculated, and the result is used as the current steady-state total current. Using the RMS value can more accurately reflect the effective value of the AC current and is suitable for scenarios where the current waveform has some distortion; using the arithmetic mean is simpler to calculate and is suitable for scenarios where the current waveform is relatively regular. Then, the predicted current peak value is calculated based on the current steady-state total current and surge current suppression parameters, and compared with the safety limit to determine whether to send a start command. By obtaining the current steady-state total current as the input for the cooperative suppression operation, the real-time load status of the power supply system can be accurately reflected, enabling the startup decision to adapt to different operating conditions.

[0049] In an optional embodiment, the surge current suppression parameters include the maximum instantaneous current threshold allowed by the front-end power supply network of the power system, the peak value of the startup surge current of a single AC-DC power module, and a preset safety margin.

[0050] In the above embodiments, the surge current suppression parameters include three key parameters: First, the maximum instantaneous current threshold I_threshold allowed by the upstream power supply network of the power system. This threshold is determined by factors such as the rated current of the circuit breaker and the instantaneous tripping current multiple of the upstream AC power distribution system, representing the maximum instantaneous current that the upstream power supply network can withstand. Exceeding this threshold will cause the upstream protection to operate. In a specific embodiment, assuming that the upstream power distribution of the power system uses a circuit breaker with a rated current of 63A and an instantaneous tripping current multiple of 10, then theoretically the maximum instantaneous current that the upstream power supply network can withstand is 630A. However, considering the operating characteristics and protection margin of the circuit breaker, the maximum instantaneous current threshold I_threshold is usually set to 1.5 to 3 times the rated current of the circuit breaker, for example, set to 95A to 189A. In practical applications, the setting of the maximum instantaneous current threshold I_threshold also needs to consider factors such as the current carrying capacity of the upstream cables and the protection coordination of the upstream power distribution system to ensure that the upstream protection will not be triggered under any circumstances. Second, the peak value of the startup inrush current I_inrush of a single AC-DC power module. This peak value can be obtained by calibrating the AC-DC power module, or it can be theoretically calculated based on the input filter capacitor value, soft start circuit parameters, etc. of the AC-DC power module. It represents the maximum inrush current generated by a single AC-DC power module at the moment of startup. Third, the preset safety margin M_safe. This margin is used to compensate for uncertainties caused by factors such as current sampling error, component parameter tolerance, and dynamic load changes. In practical applications, the preset safety margin can be set to 10% to 20% of the maximum instantaneous current threshold, or it can be set according to the safety requirements of the specific application scenario.

[0051] In an optional embodiment, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among N AC-DC power modules based on the current steady-state total current and surge current suppression parameters to start the (n+1)th AC-DC power module. Specifically, this includes: determining the target current peak value based on the current steady-state total current and the peak value of the startup surge current; determining the peak value of the startup total current based on the target current peak value and a preset safety margin; performing a safety margin comparison analysis between the peak value of the startup total current and the maximum instantaneous current threshold to obtain a safety margin comparison result; and if the peak value of the startup total current is determined to be less than the maximum instantaneous current threshold based on the safety margin comparison result, sending a startup command to the (n+1)th AC-DC power module to power on the (n+1)th AC-DC power module.

[0052] In the above embodiments, the specific execution logic of the collaborative inhibition operation is as follows: First, determine the target current peak value I_predict according to the current steady-state total current I_total_current_steady and the starting inrush current peak value I_inrush. The calculation formula is I_predict = I_total_current_steady + I_inrush. This target current peak value represents the predicted peak value of the total input current of the power supply system when starting the next AC-DC power module under the current load conditions. Then, determine the starting total current peak value according to the target current peak value I_predict and the preset safety margin M_safe. The calculation formula is starting total current peak value = I_predict + M_safe. The starting total current peak value after superimposing the safety margin is used to compare with the safety limit value. Next, perform a safety margin comparison analysis between the starting total current peak value and the maximum instantaneous current threshold I_threshold: If the starting total current peak value is less than the maximum instantaneous current threshold (i.e., I_predict + M_safe < I_threshold), the safety margin comparison result is that the safety condition is met. At this time, send a start command to the (n + 1)-th AC-DC power module to power on and start the (n + 1)-th AC-DC power module. Through the above predictive safety judgment mechanism, it is possible to confirm before starting that current overlimit will not occur, ensuring the safety of the power-on process of the power supply system.

[0053] In the above embodiments, assume that the power supply system includes 4 AC-DC power modules, the maximum instantaneous current threshold I_threshold is set to 80A, the starting inrush current peak value I_inrush of a single AC-DC power module is 30A, and the preset safety margin M_safe is set to 8A (i.e., 10% of I_threshold). After the first AC-DC power module starts and enters the steady-state operation state, assume that the current steady-state total current I_total_current_steady is 8A. Then calculate the target current peak value I_predict = 8A + 30A = 38A, and the starting total current peak value = 38A + 8A = 46A. Since 46A < 80A, the safety condition is met. Therefore, send a start command to the second AC-DC power module. After the second AC-DC power module starts and enters the steady-state operation state, assume that the current steady-state total current I_total_current_steady becomes 16A. Then calculate the target current peak value I_predict = 16A + 30A = 46A, and the starting total current peak value = 46A + 8A = 54A. Since 54A < 80A, the safety condition is met. Therefore, send a start command to the third AC-DC power module. And so on, until all AC-DC power modules have completed starting.

[0054] In an optional embodiment, the method further includes: if the peak value of the total startup current is determined to be greater than or equal to the maximum instantaneous current threshold based on the safety margin comparison result, not sending a startup command; continuing to monitor the total input current of the power system in real time, and re-performing the cooperative suppression operation on the (n+1)th AC-DC power module until the peak value of the total startup current is less than the maximum instantaneous current threshold.

[0055] In the above embodiments, when the safety margin comparison result shows that the peak value of the total starting current is greater than or equal to the maximum instantaneous current threshold (i.e., I_predict + M_safe ≥ I_threshold), it indicates that starting the next AC-DC power module under the current operating condition may cause the peak value of the total input current of the power supply system to exceed the carrying capacity of the upstream power supply network. At this time, no start command is sent to the (n+1)th AC-DC power module, and the current state is maintained. At the same time, the total input current on the AC input bus of the power supply system continues to be monitored in real time, and the cooperative suppression operation is periodically re-executed: the current steady-state total current is re-acquired, the target current peak value and the peak value of the starting total current are recalculated, and the safety margin comparison is re-performed. When the load of the already running AC-DC power module decreases or the current further stabilizes, resulting in a decrease in the current steady-state total current, the recalculated peak value of the starting total current will also decrease accordingly. Once the peak value of the starting total current is less than the maximum instantaneous current threshold, i.e., the safety condition is met, a start command is immediately sent to the (n+1)th AC-DC power module. This dynamic waiting mechanism enables the power system to adapt to load changes, automatically delaying startup when the load is high and starting up promptly when the load decreases, thus balancing safety and startup efficiency.

[0056] In the above embodiment, assume the power system contains four AC-DC power modules, the maximum instantaneous current threshold I_threshold is set to 80A, the peak inrush current I_inrush of a single AC-DC power module is 30A, and the preset safety margin M_safe is set to 8A. Currently, three AC-DC power modules are started. Due to the large load, the current steady-state total current I_total_current_steady is 45A. At this point, the target peak current I_predict is calculated as 45A + 30A = 75A, and the peak peak inrush current is 75A + 8A = 83A. Since 83A ≥ 80A, the safety condition is not met, therefore, no start command is sent to the fourth AC-DC power module. The power supply system continues to monitor the total input current in real time. Assuming that after a period of time the load decreases and the current steady-state total current I_total_current_steady drops to 40A, the target peak current I_predict is recalculated as 40A + 30A = 70A, and the peak startup current is 70A + 8A = 78A. Since 78A < 80A, the safety condition is met. At this point, a startup command is immediately sent to the fourth AC-DC power module, completing the overall startup of the power supply system. Through this dynamic waiting mechanism, even under heavy loads, the power supply system can safely complete the startup of all AC-DC power modules without manual intervention.

[0057] It should be noted that the embodiments described above are only some embodiments of this application, and not all embodiments. The present application will be described in detail below with reference to specific embodiments.

[0058] This application provides a high-power AC-DC switching surge current suppression system. Referring to Figure 2, Figure 2 is a schematic diagram of a hardware architecture of the high-power AC-DC switching surge current suppression system according to this application. The system includes:

[0059] The power monitoring unit, located on the AC input bus of the power system, is used to collect the total input current I_total on the AC input bus in real time and transmit the collected total input current signal to the main control unit. The power monitoring unit can be implemented using current sampling devices such as current transformers or sampling resistors, and needs to have sufficient bandwidth to accurately capture the rising edge and peak characteristics of surge current.

[0060] The main control unit, connected to the power monitoring unit, receives the total input current signal collected by the power monitoring unit, executes the algorithm logic of the high-power AC-DC switching surge current suppression method described above, including parameter initialization, steady-state judgment, and coordinated suppression operations, and generates enable control signals for each AC-DC power module. The main control unit can be implemented using a microcontroller unit (MCU) or a digital signal processor (DSP). The main control unit is connected to the enable control terminal EN of each AC-DC power module via control signal lines Ctrl_1, Ctrl_2, Ctrl_3, ..., Ctrl_n.

[0061] N AC-DC power modules (represented in Figure 2 as AC-DC power module 1, AC-DC power module 2, AC-DC power module 3, AC-DC power module 4, ..., AC-DC power module N) are connected in parallel to the AC input bus to receive AC input power AC_INPUT. The DC output terminals of each AC-DC power module are connected in parallel to provide DC output power DC_OUTPUT. The enable control terminal EN of each AC-DC power module is independently controlled by the main control unit. When the main control unit sends a start command (high-level or low-level enable signal, depending on the specific AC-DC power module design) to the enable control terminal EN of a given AC-DC power module, that AC-DC power module powers on and starts.

[0062] The main control unit is configured to: initialize parameters and obtain surge current suppression parameters after the power system is powered on; first start AC-DC power module 1 through control signal Ctrl_1; receive the total input current I_total signal fed back by the power monitoring unit to determine whether the started AC-DC power module has entered steady-state operation; after determining that the safety conditions are met, start the subsequent AC-DC power modules in sequence through control signals Ctrl_2, Ctrl_3, ..., Ctrl_n to realize active suppression of the total input surge current of the power system and optimized management of the startup timing.

[0063] This application embodiment also provides a core logic flow of an inhibition strategy. Referring to Figure 3, Figure 3 is a schematic flowchart of an inhibition strategy in this application embodiment, including the following steps:

[0064] Step S301, Start / Power System Power On:

[0065] Step S302: Parameter initialization, preset I_threshold (corresponding to the maximum instantaneous current threshold mentioned above), I_inrush (corresponding to the peak value of the start-up surge current mentioned above) and preset safety margin M_safe;

[0066] Step S303: Start the nth AC-DC power module;

[0067] Step S304: Monitor the total current I_total on the AC input bus of the power system in real time (corresponding to the above total input current), and make a first judgment to determine whether the started AC-DC power module (corresponding to the above nth AC-DC power module) has entered the steady-state operation state. If the result of the first judgment is negative, repeat Step S304;

[0068] Step S305: When the result of the first judgment is positive, make a second judgment to determine whether all the current AC-DC power modules (corresponding to the above n AC-DC power modules) have been started (i.e., whether n is equal to N);

[0069] Step S306: When the result of the second judgment is positive (i.e., n = N, all AC-DC power modules have been started), determine that the power system startup is complete;

[0070] Step S307: When the result of the second judgment is negative (i.e., n < N, there are still AC-DC power modules not started), calculate the predicted starting current peak I_predict (corresponding to the above target current peak), and the calculation formula is I_predict = I_total_current_steady (corresponding to the above current steady-state total current) + I_inrush (corresponding to the above starting inrush current peak);

[0071] Step S308: Make a third judgment to determine whether I_predict + M_safe is less than I_threshold. If the result of the third judgment is negative, return to Step S304;

[0072] Step S309: When the result of the third judgment is positive, send a startup instruction to the (n + 1)th AC-DC power module, update n to n + 1, and return to Step S303 to continue starting and subsequent monitoring of the updated nth AC-DC power module (i.e., the AC-DC power module that has just received the startup instruction). Loop through the above Steps S303 to S309 until all the AC-DC power modules in the power system have been started (i.e., n = N), and complete the overall power-on process of the power system.

[0073] This application embodiment also provides a comparison of the total input current waveform of the power system under time-sharing cooperative startup and traditional simultaneous startup modes. Referring to Figure 4, Figure 4 is a schematic diagram comparing the total input current waveform of the power system under time-sharing cooperative startup and traditional simultaneous startup modes in this application embodiment. Figure 4 uses a power system containing 4 AC-DC power modules as an example for illustration. In Figure 4, the upper half of the vertical axis represents the positive current, and the lower half represents the negative current, corresponding to the positive and negative half cycles of AC power, respectively. The black solid line represents the total input current waveform of the power system under the traditional simultaneous startup mode, and the red solid line represents the total input current waveform of the power system under the time-sharing cooperative startup mode of this application. The horizontal dashed line represents the maximum instantaneous current threshold I_threshold allowed by the upstream power supply network (80A is used as an example in the figure).

[0074] In the traditional simultaneous start-up mode, when four AC-DC power modules are powered on and started simultaneously, the surge current of each AC-DC power module is generated simultaneously and linearly superimposed, resulting in a surge current peak of up to about 120A in the total input current of the power system at the moment of startup, which far exceeds the maximum instantaneous current threshold I_threshold (80A). This will cause the upstream circuit breaker and other protection devices to operate, resulting in the failure of the power system to power on.

[0075] In the time-sharing collaborative startup mode of this application, the four AC-DC power modules start sequentially at staggered times, as shown by the red waveform in Figure 4. The first AC-DC power module starts first, generating a surge current peak of approximately 40A. After the first AC-DC power module enters a steady-state operating state, the second AC-DC power module starts; and so on, with the third and fourth AC-DC power modules starting sequentially. Because the surge current peaks of each AC-DC power module occur at staggered times, and a safety condition judgment is performed before each startup, the total input current peak of the power supply system always remains below the maximum instantaneous current threshold I_threshold (80A), preventing the triggering of upstream protection actions and ensuring the safe power-on of the power supply system.

[0076] As can be clearly seen from the comparison in Figure 4, the time-sharing collaborative startup strategy of this application can effectively suppress the peak value of the total input surge current of the power system, keeping it below the safety limit, and solving the problem of excessive surge current caused by the simultaneous startup of multiple AC-DC power modules.

[0077] Through the embodiments of this application, the power system monitors the total input current on the AC input bus in real time at the system level and dynamically decides the startup timing of each AC-DC power module based on this. Each AC-DC power module must undergo a safety condition judgment before startup to ensure that the peak value of the total input current after startup does not exceed the maximum instantaneous current threshold I_threshold allowed by the upstream power supply network. This ensures that the peak value of the total input surge current of the power system is always lower than the maximum instantaneous current threshold allowed by the upstream power supply network, thus achieving effective suppression of surge current. At the same time, due to the use of real-time monitoring and dynamic judgment mechanism, subsequent AC-DC power modules can be started as soon as the safety conditions are met, without waiting for a fixed delay time. This enables the optimal startup time of multiple AC-DC power modules in the power system while ensuring safety, balancing surge current suppression effect and startup efficiency.

[0078] The surge current suppression system for a high-power AC-DC switch in this application is described below from the perspective of hardware processing. Referring to Figure 5, Figure 5 is a schematic diagram of the physical device structure of a surge current suppression system for a high-power AC-DC switch in this application.

[0079] It should be noted that the structure of the high-power AC-DC switch surge current suppression system shown in Figure 5 is only an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0080] As shown in Figure 5, the high-power AC-DC switching surge current suppression system includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes according to a program stored in Read-Only Memory (ROM) 502 or a program loaded from storage portion 508 into Random Access Memory (RAM) 503, such as executing the methods described in the above embodiments. The RAM 503 also stores...

[0081] The system contains various programs and data required for operation. CPU 501, ROM 502, and RAM 503 are interconnected via bus 504. Input / output (I / O) interface 505 is also connected to bus 504. The following components are connected to I / O interface 505: input section 506, including audio input devices, push-button switches, etc.; output section 507, including a liquid crystal display (LCD), audio output devices, indicator lights, etc.; storage section 508, including a hard disk, etc.; and communication section 509, including a network interface card such as a LAN (Local Area Network) card, modem, etc. Communication section 509 performs communication processing via a network such as the Internet. Drive 510 is also connected to I / O interface 505 as needed. Removable media 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 510 as needed so that computer programs read from them can be installed into storage section 508 as needed.

[0082] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 509, and / or installed from removable medium 511. When the computer program is executed by central processing unit (CPU) 501, it performs the various functions defined in the present invention.

[0083] It should be noted that specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0084] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. Each block in a flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those shown in the drawings.

[0085] Specifically, the high-power AC-DC switch surge current suppression system of this embodiment includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, it implements the high-power AC-DC switch surge current suppression method provided in the above embodiment.

[0086] In another aspect, the present invention also provides a computer-readable storage medium, which may be included in the high-power AC-DC switching surge current suppression system described in the above embodiments; or it may exist independently and not assembled into the high-power AC-DC switching surge current suppression system. The storage medium carries one or more computer programs, which, when executed by a processor of the high-power AC-DC switching surge current suppression system, cause the high-power AC-DC switching surge current suppression system to implement the high-power AC-DC switching surge current suppression method provided in the above embodiments.

[0087] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0088] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM or random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method for suppressing surge current in a high-power AC-DC switching power supply, characterized in that, include: After the power system is powered on, parameter initialization is performed to obtain surge current suppression parameters, and the nth AC-DC power module out of N AC-DC power modules is started, where N and n are both positive integers. The total input current on the AC input bus of the power system is monitored in real time, and the following operations are performed cyclically until all N AC-DC power modules have been started: determining whether the nth AC-DC power module has entered a steady-state operating state; if the nth AC-DC power module has entered the steady-state operating state, and n is less than N, determining whether all n AC-DC power modules have entered the steady state. Operating state; When it is determined that all n AC-DC power modules have entered the steady-state operating state, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among the N AC-DC power modules according to the surge current suppression parameters to start the (n+1)th AC-DC power module; The step of performing a coordinated suppression operation on the (n+1)th AC-DC power module among the N AC-DC power modules according to the surge current suppression parameters to start the (n+1)th AC-DC power module specifically includes: obtaining the... The current steady-state total current of the n AC-DC power modules is determined; based on the current steady-state total current and the surge current suppression parameters, a coordinated suppression operation is performed on the (n+1)th AC-DC power module among the N AC-DC power modules to start the (n+1)th AC-DC power module; the surge current suppression parameters include the maximum instantaneous current threshold allowed by the front-end power supply network of the power system, the peak value of the startup surge current of a single AC-DC power module, and a preset safety margin; the (n+1)th AC-DC power module among the N AC-DC power modules is started based on the current steady-state total current and the surge current suppression parameters. Performing a coordinated suppression operation to start the (n+1)th AC-DC power module specifically includes: determining a target current peak value based on the current steady-state total current and the peak value of the startup surge current; determining the peak value of the startup total current based on the target current peak value and the preset safety margin; performing a safety margin comparison analysis between the peak value of the startup total current and the maximum instantaneous current threshold to obtain a safety margin comparison result; and, if the peak value of the startup total current is determined to be less than the maximum instantaneous current threshold based on the safety margin comparison result, sending a startup command to the (n+1)th AC-DC power module to power on the (n+1)th AC-DC power module.

2. The method according to claim 1, characterized in that, The step of determining whether the nth AC-DC power module has entered a steady-state operation specifically includes: sampling the total input current waveform over multiple consecutive AC cycles to obtain multiple current waveform amplitudes; performing fluctuation characteristic analysis on the multiple current waveform amplitudes to obtain amplitude fluctuation characteristic values; comparing the amplitude fluctuation characteristic values ​​with a preset fluctuation threshold to obtain a stability comparison result; sorting the multiple current waveform amplitudes in descending order to obtain a current waveform amplitude sequence; comparing the current waveform amplitude at the top of the current waveform amplitude sequence with a preset surge current threshold to obtain a surge characteristic judgment result; and determining whether the nth AC-DC power module has entered the steady-state operation based on the stability comparison result and the surge characteristic judgment result.

3. The method according to claim 2, characterized in that, The step of determining whether the nth AC-DC power module has entered the steady-state operation state based on the stability comparison result and the surge characteristic judgment result specifically includes: if the amplitude fluctuation characteristic value is less than the preset fluctuation threshold determined by the stability comparison result, determining that the total input current is in a stable state within the multiple AC cycles; if the amplitude of the first current waveform is less than the preset surge current threshold determined by the surge characteristic judgment result, determining that the waveform of the total input current does not have surge characteristics within the multiple AC cycles; and if the total input current is in the stable state within the multiple AC cycles and the waveform of the total input current does not have surge characteristics within the multiple AC cycles, determining that the nth AC-DC power module has entered the steady-state operation state.

4. The method according to claim 1, characterized in that, The method further includes: if the peak value of the total startup current is determined to be greater than or equal to the maximum instantaneous current threshold based on the safety margin comparison result, the startup command is not sent; the total input current is continuously monitored in real time, and the cooperative suppression operation is re-executed on the (n+1)th AC-DC power module until the peak value of the total startup current is less than the maximum instantaneous current threshold.

5. A high-power AC-DC switching surge current suppression system, characterized in that, The high-power AC-DC switching surge current suppression system includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the high-power AC-DC switching surge current suppression system to perform the method as described in any one of claims 1-4.

6. A computer-readable storage medium comprising instructions, characterized in that, When the instruction is executed on a high-power AC-DC switching surge current suppression system, the high-power AC-DC switching surge current suppression system performs the method as described in any one of claims 1-4.

7. A computer program product, characterized in that, When the computer program product is run on a high-power AC-DC switching surge current suppression system, the high-power AC-DC switching surge current suppression system performs the method as described in any one of claims 1-4.

Images