Power supply method and device, electronic equipment and readable storage medium

Abstract

A power supply method and device, electronic equipment and readable storage medium, the method comprising: determining whether the current power grid is a weak power grid (S301), if the current power grid is a weak power grid, determining the target limit current value according to the actual input voltage of the power supply system (S302), and powering the load based on the target limit current value (S303). The power supply system can adaptively adjust the limit current value of the power supply system according to the input voltage, thereby being able to provide power for the load while avoiding under-voltage of the power supply system. When the input voltage is large, the limit current value of the power supply system is adjusted to a higher value, thereby enabling the power supply system to output a larger output current, ensuring efficient charging of the load. When the input voltage is small, the limit current value of the power supply system is adjusted to a lower value, thereby enabling the power supply system to output a smaller output current, to ensure that power can be provided for the load while avoiding under-voltage of the power supply system.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a power supply method, apparatus, electronic device, and readable storage medium. Background Technology

[0002] Power supply systems are a crucial component of communication systems, providing electrical energy from the power grid to loads. Some power supply systems may be deployed in mountainous areas, highways, or other similar locations to power loads such as remote radio units (RRUs). In these scenarios, the power supply system may be located at a considerable distance from the power transformer. This distance can lead to abnormally high impedance in the transmission cables connecting the power transformer and the power supply system. Consequently, excessive voltage drop in the transmission cables can cause the power supply system to experience undervoltage and repeated restarts, ultimately preventing the RRUs and other loads from functioning properly.

[0003] In the prior art, when a power supply system experiences repeated restarts due to input undervoltage, engineers typically manually modify the power supply system's limiting current value on-site to prevent the input voltage from dropping below the undervoltage point, thereby avoiding repeated restarts.

[0004] However, existing technologies forcibly limit the power supply capacity of the power system, which may cause the load to lose power due to insufficient power supply under heavy load conditions. Summary of the Invention

[0005] This application provides a power supply method, apparatus, electronic device, and readable storage medium. The power supply system can adaptively adjust the limiting current value of the power supply system according to the input voltage, thereby providing power to the load while avoiding undervoltage of the power supply system.

[0006] Firstly, embodiments of this application provide a power supply method. This method can be applied to a power supply system, a chip within a power supply system, a rectifier within a power supply system, or a chip within a rectifier. The following description uses an application to a rectifier as an example. In this method, the power supply system supplies power to the load through an external power grid. The rectifier can determine whether the current power grid is a weak grid. If the current power grid is a weak grid, it can determine a target limiting current value based on the actual input voltage of the power supply system, and then supply power to the load based on the target limiting current value.

[0007] If the current power grid is weak, it can lead to input undervoltage in the power supply system. When input undervoltage occurs, the power supply system will activate its self-protection mechanism, causing components within the system (such as the rectifier and monitoring devices) to repeatedly restart. In this embodiment, when the current power grid is weak, the rectifier can adaptively adjust the power supply system's limiting current value based on the input voltage, thereby providing power to the load while preventing undervoltage. When the power grid is normal, such as when it can provide a larger input voltage to the power supply system, the limiting current value can be adjusted to a commonly used value, allowing the power supply system to charge the load and the battery within the system. When the power grid is weak, such as when the input voltage is low, the limiting current value can be adjusted to a lower value, allowing the power supply system to output a smaller output current, ensuring that power is provided to the load while preventing undervoltage.

[0008] In one possible implementation, the method by which the rectifier determines whether the current power grid is a weak grid can be: if the number of times the power system is in an undervoltage state within a preset time period is greater than or equal to a preset number, then the current power grid is determined to be a weak grid. Because the output voltage of the power grid varies, the bus voltage and the actual input voltage of the power system can change. Therefore, in this embodiment, determining that the current power grid is a weak grid simply because the power system is in an undervoltage state once may be inaccurate. Therefore, in order to improve the accuracy of the rectifier's determination of whether the current power grid is a weak grid, this embodiment uses the number of times the power system is in an undervoltage state within a preset time period to determine whether the current power grid is a weak grid.

[0009] The rectifier can determine whether the power system is in an undervoltage state based on at least one of the bus voltage and the actual input voltage. Optionally, if the bus voltage is less than or equal to a first undervoltage threshold, and / or the actual input voltage is less than or equal to a second undervoltage threshold, then the power system is determined to be in an undervoltage state.

[0010] If the current power grid is a weak grid, the rectifier can determine the target limiting current value based on the actual input voltage of the power system. This process can be as follows: adjust the limiting current value of the power system to a first limiting current value; obtain the sum of the first limiting current value and a preset adjusted limiting current value, and use this sum as a second limiting current value; determine the target limiting current value based on the actual input voltage of the power system operating at the second limiting current value. The first limiting current value can be predefined and is the minimum limiting current value supported by the power system. In this embodiment, a preset adjusted limiting current value can be preset, which is the amount by which the rectifier increases or decreases the limiting current value based on the adjusted limiting current value of the power system. After adjusting the first limiting current value to the second limiting current value, the rectifier can determine whether to readjust the second limiting current value based on the actual input voltage of the power system. If the actual input voltage of the power system operating at the second limiting current value is greater than a first voltage threshold, the rectifier can determine that the second limiting current value is too small and can adjust it to a larger value. It should be understood that the first voltage threshold can be the upper limit (or upper boundary) of a preset range of the actual input voltage. In this embodiment, the rectifier can determine the sum of the second limiting current value and the preset adjustment limiting current value, and use the sum of the second limiting current value and the preset adjustment limiting current value as the third limiting current value, thereby adjusting the limiting current value of the power supply system to the third limiting current value.

[0011] Specifically, if the actual input voltage of the power supply system operating at the second limiting current value is less than the second voltage threshold, then the difference between the second limiting current value and the preset adjustment limiting current value is determined, and this difference is taken as the third limiting current value, where the second voltage threshold is less than the first voltage threshold. If the actual input voltage of the power supply system operating at the second limiting current value or the third limiting current value is greater than or equal to the second voltage threshold, and less than or equal to the first voltage threshold, then the second limiting current value or the third limiting current value is taken as the target limiting current value.

[0012] In other words, in this embodiment, the rectifier can determine the target current limit value iteratively based on the actual input voltage when the power system is operating at the second current limit value. The specific steps are as follows:

[0013] A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold, and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t is taken as the target limiting current value; otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage in iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1;

[0014] B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0015] C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0016] D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

[0017] In this embodiment, the rectifier can dynamically adjust the limiting current value of the power system according to the actual input voltage, thereby adjusting the limiting current value to the target limiting current value. This method is more in line with actual application scenarios, fully charging the load according to the real-time actual input voltage, maximizing the utilization of the grid capacity, and improving charging efficiency.

[0018] In one possible implementation, the power supply system may include a battery. In this scenario, when the input voltage is already low, the range of adjustable limiting current values ​​for the power supply system is limited. Therefore, in this embodiment, to ensure the accuracy of adjusting the limiting current value, when the actual input voltage is within a suitable voltage range, increasing or decreasing the limiting current value of the rectifier will not cause undervoltage in the power supply system, and the limiting current value can still be adjusted to the target limiting current value. This method can improve the stability of the power supply system and increase the stability of the power supply method. Accordingly, in this embodiment, before determining the target limiting current based on the actual input voltage of the power supply system, it can also be determined whether the power supply system includes an energy storage module and whether the actual input voltage of the power supply system is greater than or equal to a third voltage threshold. If the power supply system includes the energy storage module and the actual input voltage is greater than or equal to the third voltage threshold, then the limiting current value of the power supply system is adjusted according to the actual input voltage to obtain the target limiting current value. It should be understood that the energy storage module can be a battery.

[0019] In one possible implementation, if the rectifier determines that the current power grid is a weak grid, it can output an alarm message indicating that the current power grid is a weak grid.

[0020] Furthermore, in this embodiment, if the current power grid is not a weak grid, the rectifier can adjust the limiting current value of the power system to the initial limiting current value. For example, if the actual output current is less than the target limiting current value, the limiting current value of the power system is adjusted to the initial limiting current value. Alternatively, if the actual input voltage is greater than or equal to a preset voltage, the limiting current value of the power system is adjusted to the initial limiting current value. In this way, when the rectifier can adjust the limiting current value of the power system when the current power grid is not a weak grid, the power system can charge the load at the maximum charging voltage, improving the intelligence of the power system.

[0021] Secondly, embodiments of this application provide a power supply device, disposed in a power supply system, wherein the power supply system supplies power to the load through an external power grid, and the power supply device includes:

[0022] The processing module is used to determine whether the current power grid is a weak grid, and if the current power grid is a weak grid, it determines the target limiting current value based on the actual input voltage of the power supply system.

[0023] The power supply module is used to supply power to the load based on the target current limit value.

[0024] In one possible implementation, the processing module is specifically used to determine that the current power grid is a weak power grid if the number of times the power system is in an undervoltage state within a preset time period is greater than or equal to a preset number.

[0025] In one possible implementation, the processing module is further configured to determine whether the power system is in an undervoltage state based on at least one of the bus voltage of the power system and the actual input voltage.

[0026] In one possible implementation, the processing module is specifically configured to determine that the power system is in an undervoltage state if the bus voltage is less than or equal to a first undervoltage threshold and / or the actual input voltage is less than or equal to a second undervoltage threshold.

[0027] In one possible implementation, the processing module is specifically configured to adjust the limiting current value of the power supply system to a first limiting current value, and to obtain the sum of the first limiting current value and a preset adjusted limiting current value, and to use the sum of the first limiting current value and the preset adjusted limiting current value as a second limiting current value; and to determine the target limiting current value based on the first actual input voltage of the power supply system when it operates at the second limiting current value.

[0028] In one possible implementation, the processing module is specifically used to perform the following steps:

[0029] A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold, and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t is taken as the target limiting current value; otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage in iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1;

[0030] B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0031] C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0032] D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

[0033] In one possible implementation, the processing module is further configured to adjust the limiting current value of the power system to the initial limiting current value if the actual output current of the power system is less than the target limiting current value.

[0034] In one possible implementation, the processing module is further configured to adjust the limiting current value of the power supply system to the initial limiting current value if the actual input voltage is greater than or equal to the second undervoltage threshold.

[0035] In one possible implementation, the processing module is specifically used to determine whether the power system includes an energy storage module and whether the actual input voltage of the power system is greater than or equal to a third voltage threshold. If the power system includes the energy storage module and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the target limiting current value is determined based on the actual input voltage of the power system.

[0036] In one possible implementation, the processing module is further configured to output an alarm message if the current power grid is a weak power grid, the alarm message being used to indicate that the current power grid is a weak power grid.

[0037] Thirdly, embodiments of this application provide a power supply device, the power supply device comprising: a processor and a memory; wherein the memory is used to store computer-executable program code, the program code including instructions; when the processor executes the instructions, the instructions cause the power supply device to perform the methods provided by the first aspect or various possible designs of the first aspect.

[0038] Fourthly, embodiments of this application provide a power supply device, including a unit, module, or circuit for performing the methods provided in the first aspect or various possible designs of the first aspect. The power supply device may be a rectifier or a module applied to a rectifier, for example, a chip applied to a rectifier.

[0039] Fifthly, embodiments of this application provide a power supply device (e.g., a chip) that stores a computer program that, when executed by the power supply device, implements the method provided by the first aspect or various possible designs of the first aspect.

[0040] In a sixth aspect, embodiments of this application provide a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods described in the first aspect or various possible designs of the first aspect.

[0041] In a seventh aspect, embodiments of this application provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the methods described in the first aspect or various possible designs of the first aspect.

[0042] Eighthly, embodiments of this application provide a power supply system including a power supply device and a monitoring device as described in the second aspect above or in various possible designs, wherein the monitoring device is used to monitor the power supply device.

[0043] Ninthly, embodiments of this application provide a power supply system, including a power system, a power grid, and a power transformer as described in the eighth aspect above, wherein the power grid supplies power to the power system through the power transformer.

[0044] It should be understood that the implementation principles and technical effects of the third to ninth aspects in the embodiments of this application can refer to the first aspect, and will not be repeated here. Attached Figure Description

[0045] Figure 1 A schematic diagram illustrating a scenario to which the power supply method provided in the embodiments of this application is applicable;

[0046] Figure 2 This is a schematic diagram of a power supply.

[0047] Figure 3 A schematic flowchart of one embodiment of the power supply method provided in this application;

[0048] Figure 4 A schematic flowchart of another embodiment of the power supply method provided in this application;

[0049] Figure 5 A schematic flowchart of another embodiment of the power supply method provided in this application;

[0050] Figure 6 A schematic flowchart of another embodiment of the power supply method provided in this application;

[0051] Figure 7 This is a schematic flowchart of another embodiment of the power supply method provided in this application.

[0052] Figure 8 This is a schematic diagram of the structure of a power supply device provided in an embodiment of this application;

[0053] Figure 9 This is a schematic diagram of another power supply device provided in an embodiment of this application. Detailed Implementation

[0054] Figure 1 This is a schematic diagram illustrating a scenario where the power supply method provided in the embodiments of this application is applicable. For example... Figure 1As shown, this scenario may include a power grid, a power transformer, a power supply system, and a load. The power transformer transforms the voltage output from the power grid and transmits the transformed voltage to the power supply system via transmission cables, thereby enabling the power supply system to power the load. The power supply system may include a rectifier and a battery. The rectifier converts the alternating current from the power grid into direct current and outputs the direct current to the load to power it. The rectifier may also output the converted direct current to the battery to charge it. The battery can store electrical energy while charging, and can discharge to power the load when the power system loses power or the voltage of the power system is insufficient. In this embodiment, the load may be, but is not limited to, a remote radio unit (RRU), and the load may also include a building base band unit (BBU). It should be understood that the above... Figure 1 The power supply scenario shown may also include other devices, such as monitoring devices, etc. This application embodiment does not limit this. Furthermore, the power supply method in this application embodiment is also applicable to power systems that do not include batteries. Figure 1 The following explanation uses a power system, including batteries, as an example.

[0055] However, when power systems are deployed in mountainous areas or along highways, the distance between the power system and the power transformer may be considerable. For example... Figure 1 As shown, the distance between the power system and the power transformer is greater than 1 km. When the power system is far from the voltage transformer, the impedance of the transmission cable between the power transformer and the power system is abnormally high. Consequently, the voltage drop of the transmission cable between the power transformer and the power system is too large, leading to an input undervoltage in the power system. Undervoltage can be understood as the input voltage of the power system being too low, failing to meet the minimum requirements for normal operation. When the power system experiences input undervoltage, it will trigger self-protection, causing components in the power system (rectifiers and monitoring devices, etc.) to repeatedly restart, ultimately preventing loads such as RRUs from functioning properly.

[0056] Figure 2 This is a schematic diagram of a power supply. For example... Figure 2 As shown, to solve the above problems, a power transformer can be added between the power system and the power transformer to shorten the length of the transmission cable between them, thereby reducing the impedance of the transmission cable and preventing undervoltage at the power system input. For example, a power transformer could be added every 500 meters between the power system and the power transformer. However, this method is costly, and if the above problems frequently occur in mountainous areas, the power transformers are large and heavy, making installation difficult.

[0057] To avoid adding extra equipment, a technical solution is currently available where engineers manually modify the power system's limiting current value on-site. This limiting current value refers to the maximum current the power system can output. For example, engineers typically adjust the limiting current value based on experience to meet the normal operating current requirements of a typical load, such as the current required for one RRU (Remote Utility Unit) to operate normally, where this RRU is the primary load. Correspondingly, because the power system limits the output current (i.e., the limiting current value), it limits the output power, indirectly limiting the input power as well. When the input power after limiting the power system's current value is less than the power supplied by the grid (voltage multiplied by current), the power system's input voltage will not be pulled down below the undervoltage protection point, thus allowing the power system to operate normally and preventing input undervoltage. However, this technical solution requires engineers to manually adjust the current limiting value at the power system's location. This manual adjustment is very costly, and once the current limiting value is modified, it cannot be changed back. Even if the power grid returns to normal, the initial current limiting value cannot be automatically restored. This effectively restricts the power supply capacity of the power system, supplying power only to the main loads. Under heavy load conditions, this can lead to power outages due to insufficient power. For example, if 12 RUUs require power, but the power system's output current is insufficient to power these loads, the batteries in the power system will discharge, causing a power outage. Furthermore, if the batteries remain in an over-discharged state for an extended period, they will become unusable.

[0058] To address the aforementioned issues, this application provides a power supply method. The power supply system can adaptively adjust its limiting current value based on the input voltage, thereby providing power to the load while preventing undervoltage. For example, when the power grid is normal, such as when it can provide a large input voltage, the limiting current value can be adjusted to a commonly used value, allowing the power supply system to charge the load and its battery. When the power grid is weak, such as when the input voltage is low, the limiting current value can be adjusted to a lower value, allowing the power supply system to output a smaller current, ensuring power supply to the load while preventing undervoltage. Furthermore, the power supply method provided in this application does not alter the existing hardware structure of the power supply system. The power supply system automatically adjusts its limiting current value based on the input voltage, improving its intelligence, ensuring battery lifespan, and requiring no manual intervention, thus reducing maintenance difficulty and costs.

[0059] It should be understood that the methods provided in the embodiments of this application can be applied not only to the above-described methods. Figure 1The power supply scenario shown can also be applied to scenarios where the input voltage of the power supply system is relatively small, and this application embodiment does not impose any limitations on this. It should be understood that the executing entity for performing the following power supply method in the embodiments of this application can be a power supply device, which can be a power supply system, or a chip in the power supply system, or a rectifier or other module included in the current power supply system, or a chip in a rectifier or other module included in the current power supply system. In the following embodiments, the executing entity is a rectifier as an example for description.

[0060] The power supply method of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. Figure 3 This is a schematic flowchart of one embodiment of the power supply method provided in this application. Figure 3 As shown, the power supply method provided in this application embodiment may include:

[0061] S301, determine whether the current power grid is a weak power grid.

[0062] S302, If the current power grid is a weak grid, the target limiting current value is determined based on the actual input voltage of the power supply system.

[0063] S303 supplies power to the load based on the target current limit value.

[0064] In S301 above, the voltage output by the power grid is variable due to various external factors. These factors can include the switching of equipment or lines within the power grid, or the aging of equipment. A weak power grid can be understood as the voltage output being less than a voltage threshold. It should be understood that the rectifier can determine whether the current power grid is a weak grid. In this embodiment, one possible implementation for the rectifier to determine whether the current power grid is a weak grid is as follows: the power grid may include a communication module, the power supply system may include a communication module, and the rectifier may be connected to the communication module in the power supply system. When the voltage output by the power grid is less than the voltage threshold, the power grid can interact with the communication module in the power supply system through its communication module to notify the rectifier that the current power grid is a weak grid. For example, when the voltage output by the power grid is less than a first voltage threshold, the power grid can send a weak grid message to the communication module in the power supply system through its communication module. This weak grid message indicates that the current power grid is a weak grid. When the communication module in the power supply system receives this message, it can synchronize the message with the rectifier.

[0065] Alternatively, another possible implementation of the rectifier determining whether the power grid is weak is as follows: when the rectifier determines that the power system is in an undervoltage state, it can determine that the current power grid is weak. In this method, the rectifier can determine whether the power system is in an undervoltage state based on at least one of the power system's bus voltage and the actual input voltage. The power system's bus voltage can be the voltage of the power factor correction (PFC) bus inside the rectifier. The actual input voltage of the power system can be the voltage currently input to the power system. It should be understood that the power system may include a monitoring device that can monitor the actual input voltage of the power system. The monitoring device, upon acquiring the actual input voltage of the power system, can send the actual input voltage of the power system to the rectifier so that the rectifier can obtain the actual input voltage of the power system.

[0066] The first method: The rectifier can determine whether the power system is in an undervoltage state based on the bus voltage of the power system. Specifically, if the bus voltage is less than or equal to a first undervoltage threshold, the rectifier can determine that the power system is in an undervoltage state. For example, the first undervoltage threshold can be 300V. It should be understood that different types of rectifiers can set different first undervoltage thresholds. The second method: The rectifier can determine whether the power system is in an undervoltage state based on the actual input voltage of the power system. Specifically, if the actual input voltage is less than or equal to a second undervoltage threshold, the rectifier determines that the power system is in an undervoltage state. For example, the second undervoltage threshold can be 70V. It should be understood that different types of power systems can set different second undervoltage thresholds. The third method: The rectifier can determine whether the power system is in an undervoltage state based on the bus voltage and the actual input voltage of the power system. Specifically, if the bus voltage is less than or equal to the first undervoltage threshold and the actual input voltage is less than or equal to the second undervoltage threshold, the rectifier determines that the power system is in an undervoltage state. It should be understood that these three methods are illustrative examples in the embodiments of this application. The first undervoltage threshold and the second undervoltage threshold in the embodiments of this application can be preset, and the first undervoltage threshold and the second undervoltage threshold can be stored in the rectifier.

[0067] Because the voltage output from the power grid varies, the bus voltage and the actual input voltage of the power supply system can change. Therefore, in this embodiment, determining that the current power grid is a weak grid simply because the power supply system is in an undervoltage state once may be inaccurate. For example, if the voltage output from the power grid suddenly drops significantly but then immediately rises again, the rectifier might determine that the current power grid is a weak grid, potentially limiting the output current adjusted by the power supply system. Therefore, to improve the accuracy of the rectifier's determination of whether the current power grid is a weak grid in this embodiment, the following possible implementation can be adopted: if the number of times the power supply system is in an undervoltage state within a preset time period is greater than or equal to a preset number, then the rectifier determines that the current power grid is a weak grid. For example, the preset number can be 9 times, and the preset time period can be 3 minutes. Specifically, if the number of times the power supply system is in an undervoltage state within 3 minutes is greater than or equal to 9 times, then the rectifier determines that the current power grid is a weak grid.

[0068] In step S302 above, if the current power grid is a weak grid, the rectifier can determine that the current grid voltage may cause the power system to repeatedly restart. In this embodiment, the rectifier can adjust the limiting current value of the power system according to the actual input voltage of the power system to avoid insufficient power supply to the load and undervoltage. The limiting current value can be understood as the maximum current value that the power system can output. In this embodiment, the rectifier can determine the target limiting current value according to the actual input voltage of the power system, so that the rectifier can adjust the limiting current value of the power system to the target limiting current value. When the power system operates at the target limiting current value, it can supply power to the load, and the power system will not restart due to undervoltage.

[0069] In one possible implementation, the rectifier can store a correspondence between the actual input voltage and the target limiting current value, which can be based on the above. Figure 1 The scenario shown in the test results indicates that the target limiting current value corresponding to the actual input voltage can be understood as the maximum current that can maintain the actual input voltage within a preset range under a certain load. For example, if the actual input voltage is 150V and the preset range is 140V-160V, then if adjusting the limiting current value of the rectifier can make the actual input voltage vary within the preset range of 140V-160V, then this adjusted limiting current value can be used as the target limiting current value. Specifically, after determining the actual input voltage, the rectifier can determine the target limiting current value based on the correspondence between the actual input voltage and the target limiting current value.

[0070] It should be understood that the embodiments of this application are based on the above. Figure 1The scenario test shown illustrates how the above correspondence can be obtained as follows: With a constant load and actual input voltage, the rectifier can change its limiting current value, thereby recording the change in actual input voltage. The maximum limiting current value among these limiting current values ​​is then used as the target limiting current value. Using this method, the target limiting current value corresponding to different actual input voltages can be obtained.

[0071] It should be noted that in this possible implementation, the rectifier can store the correspondence between the actual input voltage, the target limiting current value, and the load. Because different target limiting current values ​​have different effects on the actual input voltage when the actual input voltage is the same but the load is different, the rectifier in this embodiment can store the correspondence between the actual input voltage, the target limiting current value, and the load. This correspondence can also be based on the above... Figure 1 The scenario test is shown. For example, with a fixed load and actual input voltage, the rectifier can change the limiting current value, record the change in the actual input voltage, and then use the largest limiting current value as the target limiting current value. Using this method, the target limiting current value corresponding to different loads and different actual input voltages can be obtained. In this method, after determining the actual input voltage, the rectifier can determine the target limiting current value based on the correspondence between the actual input voltage, the target limiting current value, and the load. It should be noted that in this embodiment, the rectifier can use the load in operation as a parameter for the target limiting current value calculated above.

[0072] In another possible implementation, the rectifier can determine the target limiting current value based on the actual input voltage and the load of the power supply system. In this embodiment, to ensure the power supply system does not repeatedly restart under weak grid conditions, it is sufficient to ensure power is supplied to the main load. The rectifier can determine the target limiting current value based on the actual input voltage and the main load. It should be understood that the main load in this embodiment is pre-defined. When the rectifier determines the load in operation, it can identify the main load and use the current required by the main load as the target limiting current value.

[0073] In step S303 above, after obtaining the target limiting current value, the rectifier can adjust the limiting current value of the power supply system to the target limiting current value, and then supply power to the load based on the target limiting current value. It should be understood that after adjusting the limiting current value of the power supply system to the target limiting current value, the rectifier can adjust the output current according to the actual input voltage to ensure that the output current does not exceed the target limiting current value. It should be understood that the method by which the rectifier supplies power to the load based on the target limiting current value in this embodiment can refer to the relevant descriptions in current technical solutions, and will not be repeated here.

[0074] This application provides a power supply method. The method includes determining whether the current power grid is a weak grid. If the current power grid is a weak grid, a target limiting current value is determined based on the actual input voltage of the power supply system, and power is supplied to the load based on the target limiting current value. In this application embodiment, the power supply system can adaptively adjust its limiting current value according to the input voltage, thereby providing power to the load while avoiding undervoltage. For example, when the input voltage is high, the limiting current value of the power supply system can be adjusted to a higher value, allowing the power supply system to output a larger output current to ensure efficient charging of the load. When the input voltage is low, the limiting current value of the power supply system is adjusted to a lower value, allowing the power supply system to output a smaller output current to ensure that power is provided to the load while avoiding undervoltage.

[0075] The above embodiments describe how the rectifier can obtain the target limiting current value based on a pre-stored correspondence (such as the correspondence between the actual input voltage and the target limiting current value, or the correspondence between the actual input voltage, the target limiting current value, and the load). In the above methods, the preset relationship is obtained in a test scenario. In actual applications, due to the usage time of components in the power system or other factors, this correspondence may not match the actual application. Alternatively, the above embodiments describe how the rectifier can obtain the target limiting current value based on the actual input voltage and the main load in the load. Although this method can ensure that the power system does not repeatedly restart in a weak power grid, it cannot guarantee that all loads will be powered. Therefore, to solve these two problems, the power supply method provided in this application, based on the above embodiments, allows the rectifier to determine the target limiting current value during the adjustment of the limiting current value according to the actual input voltage, making the power supply method more in line with the actual application scenario and ensuring that each load is powered.

[0076] Figure 4 This is a schematic flowchart of another embodiment of the power supply method provided in this application. Figure 4 As shown, the power supply method provided in this application embodiment may include:

[0077] S401, determine whether the current power grid is a weak power grid.

[0078] S402, If the current power grid is a weak grid, adjust the limiting current value of the power supply system to the first limiting current value.

[0079] S403, obtain the sum of the first limiting current value and the preset adjustment limiting current value, and use the sum of the first limiting current value and the preset adjustment limiting current value as the second limiting current value.

[0080] S404 determines the target current limit value based on the first actual input voltage when the power supply system is operating at the second current limit value.

[0081] S405 supplies power to the load based on the target current limit value.

[0082] The S401 and S405 in this embodiment can be referred to the relevant descriptions in the above embodiments S301 and S303, and will not be repeated here.

[0083] In the above-described S402 embodiment, if the current power grid is a weak grid, the rectifier can continuously adjust the limiting current value of the power system to achieve a suitable limiting current value, i.e., a target limiting current value. During the adjustment process, the rectifier can first adjust the limiting current value of the power system to a first limiting current value. It should be understood that the first limiting current value can be the lowest limiting current value supported by the power system, and this lowest limiting current value can be predefined. For example, the first limiting current value of the power system can be 1A. Optionally, the first limiting current value can be related to the attributes of the power system, which may include the type of rectifier, the type of battery, its capacity, etc.

[0084] In the above S403, it should be noted that in this embodiment, a preset adjustment limit current value can be set in advance. This preset adjustment limit current value can be the amount by which the rectifier increases or decreases the limit current value of the power system based on the adjusted limit current value. Specifically, after the rectifier adjusts the limit current value of the power system to the first limit current value, the limit current value can be gradually increased. The rectifier can obtain the sum of the first limit current value and the preset adjustment limit current value, and use this sum as the second limit current value, adjusting the limit current value of the power system to this second limit current value.

[0085] For example, if the preset adjustment limit current value is 0.5A, the rectifier can obtain the sum of the first limit current value and the preset adjustment limit current value as 1.5A based on the first limit current value being 1A, and use this 1.5A as the second limit current value. The rectifier can then adjust the limit current value of the power system to 1.5A.

[0086] In the above-described S404 embodiment, the rectifier can, after adjusting the first limiting current value to the second limiting current value, determine whether to readjust the second limiting current value of the power system based on the actual input voltage of the power system. In this embodiment, the rectifier can determine whether to readjust the second limiting current value of the power system based on the actual input voltage of the power system after adjusting the first limiting current value to the second limiting current value, and a preset range. Specifically, in this embodiment, a preset range of the actual input voltage can be preset. When the actual input voltage of the power system is within this preset range, it can be determined that the power system will not restart repeatedly, and therefore the limiting current value of the power system will not be readjusted. Alternatively, when the actual input voltage of the power system is within this preset range, the limiting current value of the power system can be readjusted.

[0087] If the actual input voltage of the power supply system operating at the second limiting current value is greater than the first voltage threshold, the rectifier can determine that the second limiting current value is too small and can adjust it to be larger. It should be understood that the first voltage threshold can be the upper limit (or upper boundary) of a preset range of the actual input voltage. In this embodiment, the rectifier can obtain the sum of the second limiting current value and the preset adjustment limiting current value, and use this sum as the third limiting current value, thereby adjusting the limiting current value of the power supply system to the third limiting current value. Similarly, if the actual input voltage of the power supply system operating at the third limiting current value is greater than the first voltage threshold, the rectifier can continue to adjust the third limiting current value, and the adjustment method can refer to the above-described adjustment method for the second limiting current value.

[0088] If the actual input voltage of the power supply system operating at the second limiting current value is less than the second voltage threshold, the rectifier can determine that the second limiting current value is too large and needs to be adjusted to a smaller value. It should be understood that the second voltage threshold can be the lower limit (or lower boundary) of a preset range of the actual input voltage; that is, in this embodiment, the second voltage threshold is less than the first voltage threshold. In this embodiment, the rectifier can obtain the difference between the second limiting current value and the preset adjustment limiting current value, use this difference as the third limiting current value, and then adjust the limiting current value of the power supply system to this third limiting current value.

[0089] It should be understood that when the rectifier adjusts the limiting current value of the power system, it can adjust the limiting current value to the second limiting current value (or the third limiting current value) within a preset time period to avoid affecting the stability of the power system due to excessively rapid adjustment of the limiting current value. For example, the preset time period can be 5 seconds, and the rectifier can adjust the limiting current value of the power system from 1A to 1.5A within 5 seconds.

[0090] If the actual input voltage of the power supply system when it operates at the second limiting current value is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, it can be determined that the actual input voltage of the power supply system is within the preset range. In this case, the limiting current value of the power supply system will not be readjusted. In this embodiment, the second limiting current value can be used as the target limiting current value.

[0091] It should be noted that in this embodiment, after the rectifier adjusts the limiting current value to the second limiting current value (or the third limiting current value) within a preset time period, it can wait for a preset time period before acquiring the actual input voltage of the power supply system, and use this actual input voltage as the actual input voltage of the power supply system when it operates at the second limiting current value (or the third limiting current value). Because the actual input voltage of the power supply system may change rapidly after the rectifier adjusts the limiting current value, this embodiment allows for waiting a preset time period to acquire the actual input voltage of the power supply system in order to obtain a stable and accurate actual input voltage. For example, if the rectifier adjusts the limiting current value of the power supply system from 1A to 1.5A within 5 seconds, and the actual input voltage of the power supply system is 155V after 2 seconds, then 155V can be used as the actual input voltage of the power supply system when it operates at the second limiting current value (or the third limiting current value).

[0092] In other words, the process by which the rectifier determines the target current limit value based on the first actual input voltage when the power system is operating at the second current limit value can be viewed as an iterative process. This iterative process can be illustrated by the following steps:

[0093] A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t is taken as the target limiting current value; otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage in iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1.

[0094] B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0095] C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0096] D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

[0097] t is an integer greater than or equal to 1. In step A, when t is 1, the actual input voltage of iteration period 1 is the first actual input voltage. If the first actual input voltage is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, then the second limiting current value can be used as the target limiting current value. Wherein, if the first actual input voltage is greater than the first voltage threshold, step B can be executed. Or, if the first actual input voltage is less than the second voltage threshold, step C can be executed.

[0098] In step B, if the first actual input voltage is greater than the first voltage threshold, the sum of the current limit value (second current limit value) of iteration period 1 and the preset adjustment current limit value can be obtained, and the sum of the second current limit value and the preset adjustment current limit value can be used as the current limit value of the next iteration period, such as the third current limit value.

[0099] In step C, if the first actual input voltage is less than the second voltage threshold, the difference between the current limit value (second current limit value) of iteration period 1 and the preset adjustment current limit value is obtained, and the difference between the second current limit value and the preset adjustment current limit value is used as the current limit value of the next iteration period, such as the third current limit value.

[0100] In step D, the rectifier can obtain the actual input voltage (such as the second input voltage) when the power system is operating at the third current limit value, and enter the next iteration cycle, returning to execute A. Returning to execute A means determining the relationship between the second input voltage and the first and second voltage thresholds, and then executing steps A, B, or C as described above.

[0101] The following example illustrates the process of adjusting the limiting current value of the power supply system using a rectifier. For instance, the preset range of the actual input voltage can be 150V-160V, so the first voltage threshold can be 160V and the second voltage threshold can be 150V. The rectifier can first adjust the limiting current value of the power supply system to the first limiting current value, such as 1A. After adjusting the limiting current value to 1A, the rectifier can adjust the limiting current value from 1A to 1.5A within 5 seconds; this 1.5A is the second limiting current value. After waiting 2 seconds to obtain the actual input voltage of the power supply system, if the actual input voltage is greater than 160V, the rectifier can continue to adjust the limiting current value of the power supply system from 1.5A to 2A within 5 seconds; this 2A is the third limiting current value. After waiting 2 seconds to obtain the actual input voltage of the power supply system, if the actual input voltage is still greater than 160V, the rectifier can continue to increase the limiting current value of the power supply system. Conversely, if the input voltage of the power supply system is less than 150V after adjusting the current limiting value, the method described in step C above can be used to reduce the current limiting value for dynamic adjustment.

[0102] If the rectifier adjusts the power system's limiting current value from 1.5A to 2A within 5 seconds, and then waits 2 seconds to obtain the actual input voltage of the power system which is less than 150V, the rectifier can adjust the power system's limiting current value from 2A to 1.5A within 5 seconds, wait 2 seconds to obtain the actual input voltage of the power system, and if the actual input voltage is within the preset range of 150V-160V, then 1.5A can be used as the target limiting current value. In other words, because the actual input voltage initially increases and then decreases as the power system's limiting current value increases from the first limiting current value, the limiting current value at which the actual input voltage reaches its maximum value can be used as the target limiting current value in the above embodiment.

[0103] In this embodiment, the rectifier can dynamically adjust the limiting current value of the power system according to the actual input voltage, thereby adjusting the limiting current value to the target limiting current value. This method is more in line with actual application scenarios, fully charging the load according to the real-time actual input voltage, maximizing the utilization of the grid capacity, and improving charging efficiency.

[0104] As above Figure 1As shown, the power system in this embodiment may include a battery. When the power system is in an undervoltage state, the battery can also discharge to the load, thus providing a portion of the load current to charge the load. When the power system includes a battery, if the power system activates the automatic adjustment of the current limiting value in the above embodiment, the current supplied to the battery decreases after the current limiting value is reduced, primarily ensuring the current supplied to the load to maintain stable power supply. Simultaneously, the battery is charged with a relatively small current, allowing it to charge normally, albeit at a slower rate than when the current limiting value is not limited, but preventing the power system from collapsing (constantly restarting). If the power system does not limit the current limiting value, the current supplied to the battery increases, causing the load current (the current used to charge the battery and load) to exceed the grid's capacity. This leads to repeated undervoltage restarts, unstable power supply to the load, and inability to charge the battery. Over time, the battery will become permanently undervoltage and unusable.

[0105] In this scenario, as the actual input voltage increases from the minimum limiting current value, it can initially increase and then decrease. The above embodiment describes using the limiting current value at which the actual input voltage reaches its maximum value as the target limiting current value. If the actual input voltage of the power system is already low (e.g., 150V) when the rectifier begins adjusting the limiting current value, further increasing the limiting current value will cause the actual input voltage to decrease further, resulting in undervoltage. In other words, when the input voltage is already low, the range of adjustable limiting current values ​​for the power system is very limited. Therefore, in this embodiment, to ensure the accuracy of adjusting the limiting current value, when the actual input voltage is within a suitable voltage range, increasing or decreasing the limiting current value of the power system by the rectifier will not cause undervoltage, and the limiting current value can still be adjusted to the target limiting current value. This method improves the stability of the power system and increases the stability of the power supply method.

[0106] Figure 5 This is a schematic flowchart of another embodiment of the power supply method provided in this application. Figure 5 As shown in the embodiments of this application, S402 can be replaced by S402' and S403':

[0107] S402' If the current power grid is a weak power grid, determine whether the power system includes an energy storage module and whether the actual input voltage of the power system is greater than or equal to the third voltage threshold.

[0108] S403' If the power system includes an energy storage module and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the limiting current value of the power system is adjusted to the first limiting current value.

[0109] In S402' above, the energy storage module of the power system can be the one described above. Figure 1 The battery or other energy storage components, such as capacitors, are not limited in this application embodiment. The monitoring device mentioned in the above embodiments can monitor the operating status of each component in the power system, and can also monitor whether the power system includes an energy storage module. It is conceivable that in this application embodiment, the rectifier can interact with the monitoring device to determine whether the power system includes an energy storage module. For example, the rectifier can read the status of the energy storage module in the monitoring device; if the energy storage module is in a present state, then it is determined that the power system includes an energy storage module. In addition, this application embodiment also determines that the actual input voltage is greater than or equal to a third voltage threshold, which can be an empirically set value, such as 170V.

[0110] In S403' above, if the power system includes an energy storage module and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the rectifier in this embodiment performs the action of adjusting the limiting current value of the power system in the above embodiment. It should be understood that "adjusting the limiting current value of the power system to the first limiting current value" in S403' can be referred to the relevant description of S402 in the above embodiment.

[0111] It should be understood that in the embodiments of this application, when the power system includes an energy storage module, the purpose of also satisfying that the actual input voltage is greater than or equal to the third voltage threshold is to avoid undervoltage in the power system during the process of the rectifier adjusting the limiting current value of the power system, thereby ensuring the power supply stability of the power system.

[0112] Based on the above embodiments, Figure 6 This is a schematic flowchart of another embodiment of the power supply method provided in this application. Figure 6 As shown, the power supply method provided in this application embodiment may include:

[0113] S601, determine whether the current power grid is a weak power grid.

[0114] S602 If the current power grid is a weak power grid, an alarm message is output, and the target limit current value is determined according to the actual input voltage of the power system. The alarm message is used to indicate that the current power grid is a weak power grid.

[0115] S603 supplies power to the load based on the target current limit value.

[0116] S604 If the current power grid is not a weak grid or the load decreases, adjust the limiting current value of the power system to the initial limiting current value.

[0117] The implementation methods in S601 and S603 of this application can be referred to the relevant descriptions in the above embodiments S301 and S303, and will not be repeated here.

[0118] In step S602 above, if the current power grid is a weak grid, the rectifier can output alarm information. The alarm information indicates that the current power grid is a weak grid. In this embodiment, the rectifier may be equipped with one or more of a display module, an alarm light, or a buzzer. The rectifier can input alarm information by controlling the display module to display text such as "weak grid." Alternatively, the rectifier can turn on the alarm light, or control the buzzer to sound. Alternatively, in this embodiment, the rectifier can also send the alarm information to the user's terminal device via a communication module. This embodiment does not limit the method of outputting alarm information; the display module, alarm light, or buzzer are merely illustrative examples.

[0119] In S604 above, if the current power grid is not a weak grid, the rectifier can adjust the limiting current value of the power system to the initial limiting current value. The initial limiting current value can be understood as the limiting current value of the power system before the rectifier adjusts the limiting current value. It should be understood that the rectifier can determine that the current power grid is not a weak grid in the following ways: if the number of times the power system is in an undervoltage state within a preset time period is less than a preset number, then the current power grid is determined to be not a weak grid. Alternatively, if the actual input voltage is greater than or equal to a second undervoltage threshold, then the current power grid is determined to be not a weak grid. It should be understood that the second undervoltage threshold can be understood as the voltage required for the power system to operate normally, such as 220V, or other preset voltage values.

[0120] Alternatively, when the actual output current is less than the target limiting current value, i.e., the load on the power supply system decreases, it is not necessary to limit the limiting current value of the power supply system, nor will it cause undervoltage in the power supply system. Specifically, if the actual output current is less than the target limiting current value, it is determined that the current power grid is not a weak grid. In this embodiment, when the current power grid is not a weak grid, the purpose of adjusting the limiting current value of the power supply system to the initial limiting current value by the rectifier is to enable the power supply system to charge the load at the maximum charging voltage (i.e., the output voltage of the power supply system).

[0121] It should be understood that in this embodiment, if the power grid is not a weak grid within a preset time period, the rectifier can adjust the limiting current value of the power supply system to the initial limiting current value. For example, if the actual input voltage within the preset time period is greater than or equal to the second undervoltage threshold, it is determined that the current power grid is not a weak grid; or if the actual output current within the preset time period is less than the target limiting current value, it is determined that the current power grid is not a weak grid. This is done to avoid misjudgment by the rectifier due to sudden voltage changes in the power grid, thereby improving the accuracy and stability of the power supply method.

[0122] In this embodiment, when the rectifier adjusts the limiting current value of the power system to the initial limiting current value, it may also include eliminating alarm information to indicate that the current power grid is not a weak grid. For example, it may disable the display of text information such as "weak grid." Alternatively, the rectifier may turn off the alarm light or the buzzer.

[0123] In this embodiment, an alarm message can be output when the power grid is weak to remind users that the current power grid is weak. Additionally, the rectifier can adjust the power system's limiting current value to the initial limiting current value when the current power grid is not weak, allowing the power system to charge the load at the maximum charging voltage and improving the intelligence of the power system.

[0124] The following embodiments illustrate the power supply method in the embodiments of this application through the operation process in actual application. Figure 7 This is a schematic flowchart of another embodiment of the power supply method provided in this application. Figure 7 As shown, the power supply method provided in this application embodiment may include:

[0125] S701 If the power system is in an undervoltage state more than or equal to 9 times within 3 minutes, the rectifier determines that the current power grid is a weak grid.

[0126] S702 outputs alarm information.

[0127] S703: Determine whether the power system includes an energy storage module and whether the actual input voltage of the power system is greater than or equal to 170V. If yes, execute S704; otherwise, execute S709.

[0128] S704 adjusts the current limiting value of the power supply system to the first current limiting value of 1A.

[0129] S705 adjusts the power system's current limit from 1A to 1.5A within 5 seconds.

[0130] S706 If the actual input voltage of the power supply system is greater than 160V when the current limit value is 1.5A, the current limit value of the power supply system will continue to be increased until the actual input voltage of the power supply system when the current limit value is less than or equal to 160V and greater than or equal to 150V.

[0131] S707 If the actual input voltage of the power supply system is less than 150V when the current limit value is 1.5A, the current limit value of the power supply system will continue to be reduced until the actual input voltage of the power supply system when the current limit value is less than or equal to 160V and greater than or equal to 150V.

[0132] S708 If, within 1 minute, the actual input voltage of the power supply system is greater than the preset voltage, or the actual output current of the power supply system is less than the target limit current value, then the limit current value of the power supply system is adjusted to the initial limit current value, and the alarm information is cleared.

[0133] S709, Stop.

[0134] It should be understood that S702 and S703 can be executed simultaneously, and there is no distinction in their order. S706 and S707 can also be executed simultaneously.

[0135] In S703 of this application embodiment, if the power system includes an energy storage module and the actual input voltage of the power system is greater than or equal to 170V, the rectifier performs the action of adjusting the limiting current value of the power system in this application embodiment.

[0136] It should be noted that when the rectifier executes S706 above, if the actual input voltage of the power supply system operating at the current limit value is less than 150V, then the step in S707 can be executed. Similarly, in S707 above, if the actual input voltage of the power supply system operating at the current limit value is greater than 160V, then the step in S706 can be executed. That is to say, in this embodiment of the application, when the actual input voltage of the power supply system operating at the current limit value is less than 150V, the operation of decreasing the current limit value of the power supply system can be performed; when the actual input voltage of the power supply system operating at the current limit value is greater than 160V, the operation of increasing the current limit value of the power supply system can be performed, until the actual input voltage of the power supply system operating at the current limit value is less than or equal to 160V and greater than or equal to 150V.

[0137] It should be understood that the technical effects of the embodiments of this application can be referred to the relevant descriptions in the above embodiments.

[0138] Figure 8This is a schematic diagram of a power supply device provided in an embodiment of this application. The power supply device involved in this embodiment can be the aforementioned rectifier, a chip applied to a rectifier, or another device or module applied to a power supply system or power supply system. This power supply device can be used to perform the operation of the rectifier in the above method embodiments. Figure 8 As shown, the power supply device may include: a processing module 801 and a power supply module 802. Wherein,

[0139] The processing module 801 is used to determine whether the current power grid is a weak power grid, and if the current power grid is a weak power grid, it determines the target limiting current value based on the actual input voltage of the power supply system.

[0140] The power supply module 802 is used to supply power to the load based on the target limit current value.

[0141] In one possible implementation, the processing module 801 is specifically used to determine that the current power grid is a weak power grid if the number of times the power system is in an undervoltage state within a preset time period is greater than or equal to a preset number.

[0142] In one possible implementation, the processing module 801 is further configured to determine whether the power system is in an undervoltage state based on at least one of the bus voltage of the power system and the actual input voltage.

[0143] In one possible implementation, the processing module 801 is specifically used to determine that the power system is in an undervoltage state if the bus voltage is less than or equal to a first undervoltage threshold and / or the actual input voltage is less than or equal to a second undervoltage threshold.

[0144] In one possible implementation, the processing module 801 is specifically used to adjust the limiting current value of the power supply system to a first limiting current value, and obtain the sum of the first limiting current value and the preset adjusted limiting current value, and use the sum of the first limiting current value and the preset adjusted limiting current value as a second limiting current value; and determine the target limiting current value based on the first actual input voltage of the power supply system when it is operating at the second limiting current value.

[0145] In one possible implementation, processing module 801 is specifically used to perform the following steps:

[0146] A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold, and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t is taken as the target limiting current value; otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage in iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1;

[0147] B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period.

[0148] C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limit current value of the iteration period t and the preset adjustment limit current value is obtained, and the difference between the limit current value of the iteration period t and the preset adjustment limit current value is used as the limit current value of the next iteration period.

[0149] D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

[0150] In one possible implementation, the processing module 801 is further configured to adjust the limiting current value of the power system to the initial limiting current value if the actual output current of the power system is less than the target limiting current value.

[0151] In one possible implementation, the processing module 801 is further configured to adjust the limiting current value of the power supply system to the initial limiting current value if the actual input voltage is greater than or equal to the second undervoltage threshold.

[0152] In one possible implementation, the processing module 801 is specifically used to determine whether the power system includes an energy storage module and whether the actual input voltage of the power system is greater than or equal to a third voltage threshold; if the power system includes an energy storage module and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the target limiting current value is determined based on the actual input voltage of the power system.

[0153] In one possible implementation, the processing module 801 is further configured to output an alarm message if the current power grid is a weak power grid, the alarm message being used to indicate that the current power grid is a weak power grid.

[0154] The power supply device provided in this application embodiment can perform the operation of the rectifier in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described again here.

[0155] It should be noted that the above processing modules can be implemented in software via a processing element or in hardware. For example, a processing module can be a separate processing element or integrated into a chip in the aforementioned device. Alternatively, it can be stored as program code in the memory of the aforementioned device, and called and executed by a processing element of the device. Furthermore, these modules can be integrated in whole or in part, or implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In implementation, each step of the above method or each of the above modules can be completed through integrated logic circuits in the hardware of the processor element or through software instructions. For example, these modules can be one or more integrated circuits configured to implement the above method, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs). Furthermore, when a module is implemented by scheduling program code through a processing element, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. For example, these modules can be integrated together to form a system-on-a-chip (SOC).

[0156] Figure 9 This is a schematic diagram of another power supply device provided in an embodiment of this application. Figure 9As shown, the power supply device can be the rectifier in the above embodiments. The power supply device may include a processor 901 (e.g., CPU) and a memory 902. The memory 902 may include high-speed random-access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 902 can store various instructions for performing various processing functions and implementing the method steps of this application. Optionally, the power supply device involved in this application may also include a communication bus 903 and a communication port 904. The communication bus 903 is used to realize communication connections between components. The communication port 904 is used to realize communication between the power supply device and other peripherals. In the embodiments of this application, the memory 902 is used to store computer-executable program code, which includes instructions. When the processor 901 executes the instructions, the instructions cause the processor 901 of the power supply device to perform the processing actions of the terminal device in the above method embodiments. The implementation principle and technical effects are similar and will not be repeated here.

[0157] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state disk (SSD)).

[0158] This application also provides a power supply system, which includes a power supply device (such as a rectifier) ​​and a monitoring device as described in the above embodiments, and may further include a battery or other energy storage modules. This power supply system can be as described above. Figure 1 or Figure 2 The power supply system is shown.

[0159] This application provides a power supply system, which may include a power system, a power grid, and a power transformer as described above. The power grid can supply power to the power system through the power transformer. This power supply system can be configured as described above. Figure 1 or Figure 2 The power supply system shown.

[0160] The term "multiple" in this article refers to two or more. The term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects.

[0161] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0162] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A power supply method for a power supply system, wherein the power supply system supplies power to a load via an external power grid, characterized in that, The power supply method includes: If the number of times the power system is in an undervoltage state within a preset time period is greater than or equal to a preset number, then the current power grid is determined to be a weak power grid. If the current power grid is a weak grid, then the limiting current value of the power supply system is adjusted to the first limiting current value; Obtain the sum of the first limiting current value and the preset adjustment limiting current value, and use the sum of the first limiting current value and the preset adjustment limiting current value as the second limiting current value; Based on the first actual input voltage when the power system is operating at the second limiting current value, determine whether to readjust the second limiting current value of the power system; if the actual input voltage when the power system is operating at the second limiting current value is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, then the second limiting current value is taken as the target limiting current value; The load is powered based on the target current limit value.

2. The method according to claim 1, characterized in that, Also includes: Determine whether the power system is in an undervoltage state based on at least one of the bus voltage of the power system and the actual input voltage.

3. The method according to claim 2, characterized in that, Determining whether the power system is in an undervoltage state based on at least one of the bus voltage of the power system and the actual input voltage includes: If the bus voltage is less than or equal to a first undervoltage threshold, and / or the actual input voltage is less than or equal to a second undervoltage threshold, then the power supply system is determined to be in an undervoltage state.

4. The method according to claim 1, characterized in that, The step of determining whether to readjust the second limiting current value of the power supply system based on the first actual input voltage when the power supply system operates at the second limiting current value; if the actual input voltage of the power supply system operating at the second limiting current value is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, then the second limiting current value is used as the target limiting current value, includes: A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold, and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t is taken as the target limiting current value; otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage in iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1; B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period. C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period. D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

5. The method according to any one of claims 1-4, characterized in that, Also includes: If the actual output current of the power supply system is less than the target current limit value, then the current limit value of the power supply system is adjusted to the initial current limit value.

6. The method according to any one of claims 1-4, characterized in that, Also includes: If the actual input voltage is greater than or equal to the second undervoltage threshold, the limiting current value of the power supply system is adjusted to the initial limiting current value.

7. The method according to any one of claims 1-4, characterized in that, Before determining the target limiting current based on the actual input voltage of the power supply system, the method further includes: Determine whether the power system includes an energy storage module, and whether the actual input voltage of the power system is greater than or equal to a third voltage threshold. Determining the target limiting current based on the actual input voltage of the power supply system includes: If the power system includes the energy storage module, and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the target limiting current value is determined based on the actual input voltage of the power system.

8. The method according to any one of claims 1-4, characterized in that, Also includes: If the current power grid is a weak grid, an alarm message is output, which indicates that the current power grid is a weak grid.

9. A power supply device, installed in a power supply system, wherein the power supply system supplies power to a load via an external power grid, characterized in that, The power supply device includes: The processing module is configured to: if the number of times the power system is in an undervoltage state within a preset time period is greater than or equal to a preset number, determine that the current power grid is a weak grid; if the current power grid is a weak grid, adjust the limiting current value of the power system to a first limiting current value, obtain the sum of the first limiting current value and the preset adjusted limiting current value, use the sum of the first limiting current value and the preset adjusted limiting current value as a second limiting current value, and determine whether to readjust the second limiting current value of the power system based on the first actual input voltage when the power system is operating at the second limiting current value; if the actual input voltage when the power system is operating at the second limiting current value is greater than or equal to a second voltage threshold and less than or equal to a first voltage threshold, use the second limiting current value as a target limiting current value. The power supply module is used to supply power to the load based on the target current limit value.

10. The apparatus according to claim 9, characterized in that, Also includes: The processing module is further configured to determine whether the power system is in an undervoltage state based on at least one of the bus voltage of the power system and the actual input voltage.

11. The apparatus according to claim 10, characterized in that, The processing module is specifically used to determine that the power system is in an undervoltage state if the bus voltage is less than or equal to a first undervoltage threshold and / or the actual input voltage is less than or equal to a second undervoltage threshold.

12. The apparatus according to claim 9, characterized in that, The processing module is specifically used for A. If the actual input voltage of the power supply system in iteration period t is greater than or equal to the second voltage threshold, and the actual input voltage in iteration period t is less than or equal to the first voltage threshold, then the limiting current value in iteration period t shall be used as the target limiting current value. Otherwise, execute B or C; the first voltage threshold is greater than the second voltage threshold, and when t = 1, the actual input voltage of the iteration period t is the first actual input voltage, where t is an integer greater than or equal to 1; B. If the actual input voltage of the iteration period t is greater than the first voltage threshold, then the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the sum of the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period. C. If the actual input voltage of the iteration period t is less than the second voltage threshold, then the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is obtained, and the difference between the limiting current value of the iteration period t and the preset adjustment limiting current value is used as the limiting current value of the next iteration period. D. Obtain the actual input voltage of the power system when it operates at the limit current value in the next iteration cycle, and enter the next iteration cycle, then return to execute A.

13. The apparatus according to any one of claims 9-12, characterized in that, The processing module is further configured to adjust the limiting current value of the power supply system to the initial limiting current value if the actual output current of the power supply system is less than the target limiting current value.

14. The apparatus according to any one of claims 9-12, characterized in that, The processing module is further configured to adjust the limiting current value of the power supply system to the initial limiting current value if the actual input voltage is greater than or equal to the second undervoltage threshold.

15. The apparatus according to any one of claims 9-12, characterized in that, The processing module is further configured to determine whether the power system includes an energy storage module and whether the actual input voltage of the power system is greater than or equal to a third voltage threshold; if the power system includes the energy storage module and the actual input voltage of the power system is greater than or equal to the third voltage threshold, then the target limiting current value is determined based on the actual input voltage of the power system.

16. The apparatus according to any one of claims 9-12, characterized in that, The processing module is further configured to output an alarm message if the current power grid is a weak power grid, the alarm message being used to indicate that the current power grid is a weak power grid.

17. A power supply system, characterized in that, include: The power supply device and monitoring device as described in any one of claims 9-16; The monitoring device is used to monitor the power supply device.

18. A power supply system, characterized in that, include: The power grid, the power transformer, and the power supply system as described in claim 17, wherein the power grid supplies power to the power supply system through the power transformer.

19. An electronic device, characterized in that, include: Memory, processor; The processor is configured to couple with the memory, read and execute instructions in the memory to implement the method of any one of claims 1-8.

20. A computer-readable storage medium, characterized in that, The computer storage medium stores computer instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1-8.

21. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 1-8.

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