Power module call control method and charging system

Abstract

This application discloses a power module control method and a charging system, relating to the field of charging technology. The method is applied to a charging system comprising at least two power modules and at least one charging interface, with the power modules connected according to a preset connection method. The method includes: determining the charging link of the charging interface based on the preset connection method and the required power of the charging interface, and sequentially controlling each power module to supply power to the charging interface according to the charging link; if an abnormal power module exists in the charging link, controlling the abnormal power module and its nearest normal power module on the charging link to form a module group, and connecting the module group to the charging interface after the normal power module in the module group is pre-charged to a preset voltage. This protects the abnormal power module from the impact of a sudden large voltage when it enters the charging link, improving the safety of the charging system.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a method for controlling the use of a power module and a charging system. Background Technology

[0002] In existing charging systems, a common architecture is multiple power modules connected in parallel, with the DC side of each module connected to the charging gun via a switching circuit. When a power module fails to operate due to a malfunction or inability to power on, the power output paths of other normal modules may still need to pass through the link where the malfunctioning module is located. For example, when multiple modules need to output in parallel to meet vehicle charging requirements, if an intermediate module malfunctions, the normal modules must sequentially close the switches on their paths to connect to the power line.

[0003] However, at the instant the switch directly connected to the fault module is closed, because the fault module, although unable to output power, is still physically connected to the power line, its front end will suddenly experience a high voltage surge of several hundred volts from the charging gun side. This instantaneous high voltage will cause severe electrical stress on the anti-reverse diode at the front end of the fault module, which can easily lead to the breakdown and damage of the anti-reverse diode, thereby affecting the reliability and safety of the entire charging system. Summary of the Invention

[0004] The main purpose of this application is to provide a power module call control method and a charging system to protect abnormal power modules from the impact of instantaneous high voltage when switching into the charging link, thereby improving the safety of the charging system.

[0005] To achieve the above objectives, this application provides a method for controlling the use of power modules, applied to a charging system. The charging system includes at least two power modules and at least one charging interface, with the power modules connected according to a preset connection method. The method includes: Based on the preset connection method and the power requirement of the charging interface, the charging link of the charging interface is determined, and each power module is controlled to supply power to the charging interface in sequence according to the charging link; If there is an abnormal power module in the charging link, the abnormal power module and the nearest normal power module on the charging link are connected to form a module group. While controlling the normal power module in the module group to be precharged to a preset voltage, the module group is connected to the charging interface.

[0006] Optionally, the charging interface is directly connected to the designated power module via a main power switch; if the abnormal power module is a power module directly connected to the charging interface, then connecting the module group to the charging interface includes: controlling the main power switch to close, so that the module group is connected to the charging interface.

[0007] Optionally, each of the power modules is interconnected with each other according to the preset connection method and via a controllable switch; if the abnormal power module is a power module that is not directly connected to the charging interface, then connecting the module group to the charging interface includes: closing the controllable switch connected to the module group near the charging interface, so that the module group is connected to the charging interface.

[0008] Optionally, the abnormal power control module and the nearest normal power module on the charging link are connected to form a module group, including: controlling the closure of all controllable switches between the abnormal power control module and the nearest normal power module on the charging link to form the module group.

[0009] Optionally, the charging link has two or more consecutive abnormal power modules, and controlling the abnormal power modules and the nearest normal power module on the charging link to form a module group includes: controlling each of the abnormal power modules to connect to form an initial module group, and controlling the initial module group and the nearest normal power module on the charging link to connect to form the module group.

[0010] Optionally, the number of normal power modules closest to the abnormal power module on the charging link is two; controlling the abnormal power module and its closest normal power module on the charging link to form a module group includes: controlling the abnormal power module and any of its closest normal power modules on the charging link to form a module group.

[0011] Optionally, the charging link has two abnormal power modules separated by only one normal power module; controlling the abnormal power module and the nearest normal power module on the charging link to form a module group includes: controlling the two abnormal power modules to connect with the normal power module between the two abnormal power modules to form a module group.

[0012] Optionally, the method further includes: determining the target power module currently undergoing pre-charging and the controllable switch to be closed, and obtaining the voltage across the controllable switch to be closed; wherein the target power module is directly connected to the controllable switch to be closed; if the voltage at the end of the controllable switch to be closed connected to the target power module is less than the voltage at the end of the controllable switch to be closed furthest from the target power module, then the controllable switch to be closed is closed.

[0013] Optionally, the method further includes: determining the controllable switch to be closed; if it is determined that closing the controllable switch to be closed will form a charging loop, then prohibiting the closing of the controllable switch to be closed; wherein, in the charging loop, at least one power module supplies power to the charging interface through two charging links.

[0014] In addition, to achieve the above objectives, this application also provides a charging system, including at least two power modules, at least one charging interface, a power distribution device, and a main controller; the main controller is connected to each of the power modules, each of the charging interfaces, and the power distribution device respectively, and the main controller is used to execute the power module calling control method as described in any one of claims 1 to 9; the power distribution device is connected to each of the power modules and each of the charging interfaces respectively.

[0015] The power module calling control method of this application, after determining the charging link corresponding to the charging interface, if there is an abnormal power module in the charging link, first connects the abnormal power module to the nearest normal power module on the charging link; then pre-charges the normal power module, so that the DC side voltage of the abnormal power module gradually increases with the DC side voltage of the normal power module until it reaches the preset voltage; finally, the module group composed of the abnormal power module and the normal power module is directly connected to the charging link to supply power to the charging interface. When the module group is connected, the DC side voltage of the abnormal power module is close to the input voltage of the charging interface, thereby protecting the abnormal power module from the impact of instantaneous large voltage when connecting to the charging link and improving the safety of the charging system. Attached Figure Description

[0016] Figure 1 This is a scenario example of the power module invocation control method according to an embodiment of this application; Figure 2 This is one of the flowcharts of the invocation control method in this application embodiment; Figure 3 This is a schematic diagram of the default connection method of the power module in the first example of this application; Figure 4 This is a schematic diagram of the preset connection method of the power module in the second example of this application; Figure 5 This is a schematic diagram of the preset connection method of the power module in the third example of this application; Figure 6 This is a schematic diagram of the preset connection method of the power module in the fourth example of this application; Figure 7 This is the second flowchart of the invocation control method in this application embodiment; Figure 8 This is a schematic diagram of the preset connection method of the power module in the fifth example of this application; Figure 9 This is the third flowchart of the invocation control method in this application embodiment; Figure 10 This is a schematic diagram of the preset connection method of the power module in the sixth example of this application; Figure 11 A schematic diagram of the physical structure of a main controller is provided; In the diagram, 110 is the power module; 120 is the charging interface; 130 is the main controller; 140 is the power distribution device; 150 is the charging terminal; 1110 is the processor; 1120 is the communication interface; 1130 is the memory; and 1140 is the communication bus.

[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the field of DC charging technology for electric vehicles, to meet the demands of high-power fast charging, charging piles typically employ an architecture of multiple AC / DC power modules connected in parallel. The AC side of each power module is connected to the power grid, while the DC side is connected in parallel to the charging gun output point via a switching network (i.e., a power distribution device). In practical applications, by controlling the switching of different numbers of power modules, the required charging voltage and current for the vehicle can be flexibly matched.

[0020] However, according to national standards, a reverse diode (i.e., a reverse protection diode) must be connected in series between each power module and the power output link. Its core function is to block reverse current and prevent reverse voltage from the vehicle battery or other modules from flowing back into the power module, thereby protecting the power devices in the power module from damage. While this design ensures the safety of a single module, it introduces new electrical surge risks in complex switching scenarios involving multiple modules in parallel and faulty modules.

[0021] For example, assume P1 is the charging point, M1, M2, and M3 are three AC / DC power modules, and S1 and S2 are two controllable switches. Switch S1 connects the DC sides of M1 and M2, and switch S2 connects the DC sides of M2 and M3. M1, M2, and M3 are sequentially connected to the charging point P1. Assume that charging point P1 starts charging a vehicle, requiring the output power of two modules (e.g., a voltage of 500V and a current of 20A). However, M2 is unable to power on due to a fault. Therefore, the only usable power modules are M1 and M3.

[0022] The current power module switching method is typically as follows: First, power module M1 is turned on, and its output voltage reaches the 500V required by the vehicle. Then, switch S1 is closed. Since the power output link of power module M3 to P1 needs to pass through two stages of switches S2 and S1 in sequence, after power module M3 is turned on and also reaches 500V, switch S2 is closed. At this time, the output power of M3 is combined with the output power of M1 through S2 and S1 to charge the vehicle together.

[0023] However, the above switching scheme has a serious flaw: although power module M2 is faulty and unable to output power, it is still physically connected to the power output link between S1 and S2. The instant switch S1 is closed, a voltage of several hundred volts is suddenly applied to the DC side of power module M2 (i.e., the cathode side of its reverse protection diode), originating from the already powered-on power module M1. This instantaneous high voltage causes the reverse protection diode to experience extreme reverse electrical stress, leading to breakdown of its internal PN junction and permanent damage. Once the reverse protection diode fails, not only will power module M2 completely lose its protection capability, but it may also trigger a short circuit, further affecting the safe operation of other normal power modules in the entire charging system.

[0024] It is evident that existing power module switching schemes, when multiple modules are connected in parallel and a faulty module exists, inevitably cause destructive voltage surges to the anti-reverse diodes at the faulty power modules during the step-by-step switching process. This potential hazard has not yet been effectively resolved. Therefore, there is an urgent need to propose an improved circuit topology or control strategy that can prevent the anti-reverse diodes from being impacted during the instantaneous switch closure in the event of a module failure, thereby improving the reliability and lifespan of the charging system.

[0025] To address this, this application provides a method for controlling the use of power modules and a charging system. By first connecting the abnormal power module with an adjacent normal power module to form a module group, the normal power module is pre-charged, thereby gradually increasing the voltage on the DC side of the abnormal power module until it reaches the preset pre-charge voltage. At this point, the module group is switched to the charging link together. This avoids high-voltage surges, protects the reverse protection diode of the abnormal power module, and improves the safety of the charging system.

[0026] For ease of understanding, this specification provides a scenario example of a power module call control method, which is applied in situations such as... Figure 1 The example application environment is shown. In this example scenario, a large electric vehicle charging station is used. In this scenario, the charging system of the charging station may include several power modules 110, several charging interfaces 120, a main controller 130, a power distribution device 140, and several charging terminals 150.

[0027] It should be noted that the charging system in this scenario example is a split-type DC charging pile. The power module 110, charging interface 120, main controller 130, and power distribution device 140 constitute the charging pile. Each charging terminal 150 is set separately from the main body of the charging pile. The charging terminal 150 is equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0028] In this scenario example, the power module 110 may include an AC / DC power conversion module and a DC / DC power conversion module. The power module 110 is used to convert the AC power input from the power grid into the required DC power, and then provide the DC power to the charging interface 120.

[0029] Each charging port 120 can be directly connected to a designated power module 110 via a power distribution device 140, with different charging ports 120 directly connected to different power modules 110. The charging port 120 and the directly connected power module 110 can be connected via a power switch device, or they can be directly connected by a single wire. Each charging port 120 is connected to a corresponding charging terminal 150.

[0030] The main controller 130 is connected to each power module 110 and each charging interface 120 respectively. The main controller 130 is used to obtain the power demand of each charging interface 120 and generate scheduling instructions for the power modules according to the connection relationship of the controllable switches in the power distribution device 140 and the power demand. In addition, the main controller 130 is also used to execute the power module calling control method of the present application embodiment, which is mainly implemented by controlling the power module to turn on, precharge, and issue control instructions to the controllable switches of the power distribution device.

[0031] The power distribution device 140 is connected to each power module 110, each charging interface 120, and the main controller 130. The power distribution device 140 is composed of multiple controllable switches, such as contactors or relays. The power distribution device 140 can connect different power modules 110 through its internal controllable switches, and then, according to the scheduling commands issued by the main controller 130, controls the opening and closing of its internal controllable switches to distribute the power output of each power module 110 to each charging interface 120 as needed, and then output it to the charging electric vehicle. The power distribution device 140 can connect the power modules 110 in different preset connection methods, and different combination methods result in different power module distribution results.

[0032] In some implementations, the charging system can also be an integrated DC charging pile, with the charging interface 120 connected to the charging gun, and the charging gun being hung on the main unit of the charging system via a gun mount on the main body of the charging system.

[0033] Referring to the scenario example of the power module invocation control method in the foregoing embodiments, the power module invocation control method of this application embodiment will be described in detail below.

[0034] Figure 2 This is one of the flowcharts of the invocation control method in the embodiments of this application. This invocation control method can be executed by the main controller of the charging system in the aforementioned scenario example, such as... Figure 2 As shown, the invocation control method may include the following steps: Step 210: Based on the preset connection method and the power requirement of the charging interface, determine the charging link of the charging interface, and control each power module to supply power to the charging interface in sequence according to the charging link.

[0035] Step 220: If there is an abnormal power module in the charging link, control the abnormal power module and the nearest normal power module on the charging link to form a module group, and connect the module group to the charging interface while the normal power module in the control module group is precharged to the preset voltage.

[0036] First, it should be noted that the calling control method of this application embodiment can be applied to a charging system, which includes at least two power modules and at least one charging interface; the power modules are connected according to a preset connection method, thereby enabling different power outputs to the charging interface. The preset connection method can be a star, series, ring, star-ring combination, or other connection methods. The calling control method of this embodiment can be applied to any combination connection method of power modules, and no specific limitation is made here on the preset connection method.

[0037] In this embodiment, the main controller can allocate power modules to the charging interface and determine the charging link based on the preset connection method of each power module, the power requirement of the charging interface, the current status of each power module and the maximum output power, so as to call each power module to supply power to the charging interface in sequence according to the charging link.

[0038] Specifically, the main controller can obtain the power demand of the vehicle being charged by interacting in real time with the BMS (Battery Management System). This power demand is the power required by the charging interface connected to the vehicle. It should be noted that this power demand is typically calculated by the vehicle's BMS based on the battery's real-time voltage, state of charge (SOC), temperature, and the battery's maximum allowable charging current, and is expressed as the product of the required voltage and current. For example, if an electric vehicle's BMS outputs a required voltage of 500V and a required current of 20A, then the required power is 10kW.

[0039] After receiving the power demand, the main controller can combine the rated output power of each power module in the charging system, its current status (e.g., online, faulty, or offline), and the information of power modules currently occupied by other charging interfaces, and use any existing power module allocation strategy to determine the number of power modules that need to be allocated to the charging interface, as well as the voltage and current settings that each power module should output.

[0040] Furthermore, the main controller can determine the charging link for the current charging interface based on the preset connection methods between each power module and the switching network topology between the currently available power modules and the charging interface. It should be noted that the charging link refers to the complete electrical path from the output of one or more selected power modules, through the corresponding switching elements (such as DC contactors and solid-state relays), the common bus, and intermediate nodes on the path, to the charging interface.

[0041] Figure 3 This is a schematic diagram of the preset connection method of the power module in the first example of this application. It should be noted that the charging link connection relationship shown in the figure refers to the connection relationship after the DC side of the power module is connected in parallel.

[0042] like Figure 3As shown in the example, charging interface A is directly connected to power module 1, and power modules 1 through 9 are connected via relays in a grid matrix. If the power requirement of charging interface A is 90kW, and the rated output power of each power module is 40kW, then calculations determine that charging interface A requires 3 power modules for power supply. Assuming that power modules 1 through 9 are all online and functioning normally, the charging link corresponding to charging interface A can be: power module 1 – power module 2 – power module 3, or: power module 1 – power module 2 – power module 5, or: power module 1 – power module 4 – power module 7, etc. If power module 7 is already occupied by charging interface B, then the charging link corresponding to charging interface A can be: power module 1 – power module 4 – power module 5.

[0043] After determining the charging link using the above method, the main controller sequentially controls each power module to power on and close its corresponding controllable switch according to the arrangement order of the power modules in the charging link, thus switching the power module to that charging link. The arrangement order of the charging link is typically: starting with the power module closest to the charging interface. For example, continue to refer to... Figure 3 If the charging link is: power module 1 - power module 2 - power module 3, then power module 1 is powered on first for pre-charging and then switched to the charging link; then power module 2 is powered on for pre-charging and then switched to the charging link; finally, power module 3 is powered on for pre-charging and then switched to the charging link.

[0044] Therefore, the main controller can allocate power modules to the charging interface and call each power module to supply power to the charging interface. However, if there is at least one abnormal power module on the charging link of the charging interface, and some power modules need to pass through the abnormal power module, the front end of the abnormal power module will be subjected to a momentary large voltage surge at the instant the abnormal power module enters the charging link. At this time, it may cause a surge to the anti-reverse diode at the front end of the abnormal power module, causing the anti-reverse diode to break down.

[0045] Figure 4 This is a schematic diagram of the preset connection method of the power module in the second example of this application. For example... Figure 4 As shown, P1 is the charging interface (i.e., the outlet point); M1, M2, and M3 are three power modules; and S1 and S2 are two controllable switches. It should be noted that the charging link connection shown in the diagram refers to the connection of the charging modules connected in parallel on the DC side.

[0046] As an example, if charging port P1 starts charging, it requires the output power of two power modules. If M2 is malfunctioning (or unusable), then the power modules available for P1 are M1 and M3. Therefore, the actual power switching method is as follows: M1 is turned on, and after reaching the voltage and current required for vehicle charging (e.g., 500V and 20A), switch S1 is closed. Although M2 is unusable, M3's connection to P1's charging path requires passing through switches S1 and S2. Therefore, when M3 is turned on and reaches the pre-charge voltage and current, switch S2 is closed. At this point, M3's output power passes through switches S2 and S1, merging with M1's output power to charge the vehicle connected to charging port P1.

[0047] However, this solution has a problem: although M2 cannot be used, it will be connected to this charging link in actual application; when the switch S1 is closed, the connection point A of M2 will suddenly be connected to a high voltage, possibly several hundred volts, which will cause a large impact on the anti-reverse diode in M2, thus causing damage to the anti-reverse diode in M2.

[0048] To address the aforementioned issues, this embodiment connects the malfunctioning power module to its nearest normal power module on the charging link, forming a module group. It's important to note that "nearest neighbor" in this embodiment refers to the nearest normal power module within the charging link's connection relationships, not necessarily the closest in physical space. Specifically, in the topology structure formed by the power modules according to a preset connection method, the power modules are connected in a defined electrical sequence via switches and wires. When a power module malfunctions, the system searches forward or backward along the electrical connection direction of the malfunctioning module on the charging link. The first normally functioning power module encountered is defined as the "nearest neighbor" normal power module. This "nearest neighbor" depends entirely on the node order within the charging link, not on the physical installation location or spatial distance of the power modules within the cabinet.

[0049] Continue to refer to Figure 3 As an example, suppose the charging link corresponding to charging interface A is: power module 1 - power module 2 - power module 5 - power module 6, where power module 5 is an abnormal power module and the rest are normal power modules; then the normal power module closest to power module 5 can be power module 2 or power module 6.

[0050] It should also be noted that when combining abnormal power modules with the nearest normal power modules to form a module group, the abnormal power module can be grouped with only one nearest normal power module.

[0051] In this embodiment, after connecting the abnormal power module to the nearest normal power module on the charging link to form a module group, the normal power module in the module group can be powered on and pre-charged first. Pre-charging refers to controlling the power module to start with a lower voltage or a slowly rising voltage before connecting it to the charging link, so that its output voltage gradually increases to a preset voltage value, thereby avoiding excessive voltage difference and inrush current at the moment of subsequent switch closure. The pre-charging process usually adopts a soft start or slope control method, that is, the main controller sends a voltage rise command to the power module, so that the output voltage of the power module smoothly rises from zero to the preset voltage according to a set slope (such as 10V / ms), and the output current and voltage changes of the power module are monitored in real time during the process to ensure that there is no abnormal overcurrent or overvoltage.

[0052] It should be noted that the preset voltage value can be determined jointly based on the charging voltage currently required by the charging interface and / or the output voltage of the normally operating power module in the charging link. For example, if the charging interface requires a charging voltage of 500V, the preset voltage can be set to 490V.

[0053] When the normal power module in the module group is pre-charging, its DC-side voltage gradually increases from 0V to the preset voltage. Since the DC-side of the abnormal power module is connected to that of the normal power module, its DC-side voltage change is the same, also gradually increasing from 0V to the preset voltage. When the output voltage of the normal power module reaches the preset voltage, it indicates that the normal power module has completed pre-charging. At this point, the DC-side voltage of the abnormal power module is also at the preset voltage. When the module group is then switched to the charging link, the DC-side voltage of the abnormal power module is close to the voltage at the charging interface input, preventing a large voltage difference and thus avoiding inrush current that could cause voltage surges to the anti-reverse diodes in the abnormal power module. This protects the device safety of the abnormal power module and ensures normal power supply to the charging link, guaranteeing the normal charging process.

[0054] As an example, continue to refer to Figure 4Power module M2 is an abnormal power module. After the main controller controls M1 to start normally and provides power output to the vehicle at P1, switch S2 can be closed first, instead of switch S1 in the normal switching logic. At this time, M2 and M3 are considered as a module group. The voltage at connection points A and B of the two modules is 0V, because switch S1 is not yet closed, and the voltage at the M1 terminal is not actually connected to the module group. Then M3 is turned on and pre-charged. If the preset voltage is 500V, then M3 will gradually increase from 0V to 500V after being turned on. Since switch S2 is already closed, the voltage at the anti-reverse diode at connection point A of M2 also gradually increases from 0V to 500V. There is no sudden large voltage surge, which does not significantly impact the physical characteristics of this diode, thus protecting its lifespan. When the output voltage of M3 rises to the preset voltage, the overall output voltage of the module group can be considered to have reached 500V, that is, the voltage at connection points A and B is the same, i.e., VA=VB=500V. Then close switch S1 to connect the module group to the charging link of P1.

[0055] Therefore, the call control method in this embodiment ensures that the normal power module can be connected to the charging link to provide power to the charging interface, and also avoids the sudden application of high voltage to the connection point of the abnormal power module when the abnormal power module is connected to the charging link, which would damage the anti-reverse diode inside the abnormal power module. This effectively protects the components of the abnormal power module and avoids unnecessary damage. At the same time, it does not affect the normal progress of the charging process and does not require additional hardware replacement, thus ensuring the overall power supply capacity of the charging system.

[0056] In some implementations, the charging interface is directly connected to the designated power module via a main power switch; if the abnormal power module is a power module directly connected to the charging interface, then connecting the module group to the charging interface may include: controlling the main power switch to close, so that the module group is connected to the charging interface.

[0057] In this embodiment, the charging interface is directly connected to a designated power module. If this directly connected power module malfunctions and cannot output power normally, the abnormal power module can be connected to a normal power module adjacent to it on the charging link to form a module group according to the above-mentioned calling strategy. Then, the main power switch corresponding to the charging interface can be directly controlled to close.

[0058] Continue to refer to Figure 4 As an example, if the power module M1 in the diagram is malfunctioning and cannot be used, then after the charging interface P1 is connected to the charging vehicle, the main power switches K1 and K2 (not shown in the diagram) at the connection point D will initially be in the off state.

[0059] Furthermore, the main controller first closes the controllable switch S1, combining M1 and M2 into a module group. Then, it controls the power module M2 to power on and pre-charge, with the output voltage of power module M2 gradually increasing to a preset voltage, maintaining consistency between connection points A and C. Once the voltage of the module group reaches the preset voltage, the main power switches K1 and K2 at connection point D are closed, thereby charging the vehicle connected to P1.

[0060] Continue to refer to Figure 4 As another example, if power module M3 malfunctions and cannot be powered on, the main controller will first power on power module M1. Once the output voltage of power module M1 reaches the preset voltage, switches K1 and K2 at point D will close. At this time, power module M1 will be connected to the charging link of charging interface P1. Further, power module M2 will power on, and its output voltage will gradually rise to the preset voltage. Then, controllable switch S1 will close, connecting power module M2 to the charging link of charging interface P1 to provide charging power. If power module M3 malfunctions and is at the end of the charging link, power module M3 will not be used, and controllable switch S2 will not close.

[0061] In some implementations, if the abnormal power module is a power module that is not directly connected to the charging interface, connecting the module group to the charging interface may include: closing the controllable switch connected to the module group near the charging interface to connect the module group to the charging interface.

[0062] When the abnormal power module is not directly connected to the charging interface, but is located in the middle of the charging link, after the module group is assembled, it is only necessary to close the controllable switch on the side of the module group closest to the charging interface to allow the power of the module group to be smoothly connected to the charging link and delivered to the charging interface for output. It should be noted that the controllable switch on the side of the module group closest to the charging interface refers to the controllable switch that is closest to the charging interface among all the controllable switches connected in the module group on the charging link.

[0063] In some implementations, the power modules are interconnected according to a preset connection method and through controllable switches; step 220, controlling the abnormal power module and the nearest normal power module on the charging link to form a module group, may include: controlling all controllable switches between the abnormal power module and the nearest normal power module on the charging link to close, thereby forming a module group.

[0064] In a charging system, power modules are interconnected via controllable switches according to a preset connection method. These controllable switches are typically centrally located in the power distribution unit of the charging system. The power distribution unit is one of the core components of the charging equipment, integrating a switch matrix composed of contactors, relays, or high-power MOSFETs. The main controller sends control commands to the power distribution unit, which then outputs control signals based on these commands to drive the closing and opening of these controllable switches, thereby dynamically reconstructing the electrical topology between the power modules and the charging interface.

[0065] When it is necessary to connect the abnormal power module to the nearest normal power module on the charging link, the main controller sends a switch control command to the power distribution device to close all controllable switches between the two, thereby enabling the abnormal power module and the normal power module to connect.

[0066] The following section details the formation process of the module group using the switching topology of two power distribution devices.

[0067] Continue to refer to Figure 4 As an example, if power modules M1 and M2 are both faulty power modules, power module M3 needs to provide power to charging interface P1. For M3 to switch to the charging link to charging interface P1, switches S1 and S2 must be closed, passing through power modules M1 and M2. The nearest normal power module to the faulty power modules M1 and M2 on the charging link is M3. Therefore, M1, M2, and M3 need to be grouped into a module group. In this case, the main controller can first control all controllable switches between the faulty power modules M1 and M2 and the nearest normal power module M3, i.e., issue control commands to close switches S1 and S2. After switches S1 and S2 are closed, the faulty power modules M1 and M2 and the nearest normal power module M3 can form a module group.

[0068] Figure 5 This is a schematic diagram of the preset connection method of the power module in the third example of this application.

[0069] like Figure 5 As shown, the controllable switch described in this embodiment may include a first controllable switch and a second controllable switch. The power distribution device may include 4 switch units and 12 groups of second controllable switches. The charging system includes power modules M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11 and M12 with a rated power of 40kW, and also includes outlet points (i.e., charging interfaces) 1 to 8.

[0070] In this system, the first node 1-3 in the first switching unit is connected to the first node 4-2 in the fourth switching unit via the second controllable switch S1. The first node 4-3 in the fourth switching unit is connected to the first node 3-2 in the third switching unit via the second controllable switch S2. The first node 3-3 in the third switching unit is connected to the first node 2-2 in the second switching unit via the second controllable switch S3. The first node 2-3 in the second switching unit is connected to the first node 1-2 in the first switching unit via the second controllable switch S4. These first nodes, connected via the second controllable switches, form the first ring network (i.e., the inner ring).

[0071] The second node 1-1 in the first switching unit is connected to the second node 4-1 in the fourth switching unit via the second controllable switch S5. The second node 4-1 in the fourth switching unit is connected to the second node 3-1 in the third switching unit via the second controllable switch S6. The second node 3-1 in the third switching unit is connected to the second node 2-1 in the second switching unit via the second controllable switch S7. The second node 2-1 in the second switching unit is connected to the second node 1-1 in the first switching unit via the second controllable switch S8. After these second nodes are connected via the second controllable switches, a second ring network (i.e., the outer ring) is formed.

[0072] The first node 1-3 in the first switching unit is connected to the first node 4-3 in the fourth switching unit via the second controllable switch S9. The first node 4-3 in the fourth switching unit is connected to the first node 3-3 in the third switching unit via the second controllable switch S10. The first node 3-3 in the third switching unit is connected to the first node 2-3 in the second switching unit via the second controllable switch S11. The first node 2-3 in the second switching unit is connected to the first node 1-3 in the first switching unit via the second controllable switch S12. After the first nodes are connected via the second controllable switches, a quadrilateral (i.e., a cross connection) is formed.

[0073] refer to Figure 5Taking the switch topology in the example, the charging link determined for outlet point 1 is power module M1-power module M4-power module M5, where power module M4 is an abnormal power module. The nearest normal power module to the abnormal power module M4 on the charging link can be either M1 or M5. If the abnormal power module M4 is grouped with its nearest normal power module M1, it is only necessary to close the second controllable switch S10 between M4 and M1; after the main controller issues a control command to close the second controllable switch S10, M1 and M4 are connected to form a module group. If the abnormal power module M4 is grouped with its nearest normal power module M5, it is only necessary to close the first controllable switch K2-2 between M4 and M5; after the main controller issues a control command to close the first controllable switch K2-2, M5 and M4 are connected to form a module group.

[0074] In some implementations, there are two or more consecutive abnormal power modules in the charging link. Controlling the abnormal power modules and the nearest normal power module on the charging link to form a module group may include: controlling each abnormal power module to connect to form an initial module group, and controlling the initial module group to connect with the nearest normal power module on the charging link to form a module group.

[0075] In some operating conditions, there may be two or more consecutive abnormal power modules on a single charging link. To more easily and quickly resolve the high voltage problem of multiple consecutive abnormal power modules, this embodiment proposes controlling the abnormal power modules to connect and form an initial module group, and then controlling the initial module group and the nearest neighbor normal power module on the charging link to form the aforementioned module group.

[0076] Specifically, the main controller identifies power modules that appear consecutively in the charging link and are all marked as abnormal, and then controls the closure of all controllable switches between these abnormal power modules. For example, if the charging link is: power module M1—power module M2—power module M3—power module M4, and M2 and M3 are both abnormal modules, then the main controller controls the closure of the controllable switch between M2 and M3, making M2 and M3 electrically connected to form an initial module group. At this time, although none of the modules within this initial module group can actively output power, their DC terminals are interconnected through closed switches, forming an equipotential body.

[0077] After forming the initial module group, the main controller further controls the connection between this initial module group and the nearest normal power module on the charging link. Here, "nearest neighbor" refers to the first normally functioning power module encountered along the charging link direction, starting from the boundary of the initial module group (i.e., the left and right ends of the consecutive abnormal modules). For the initial module group, there may be one nearest normal module on each of its left and right sides. The main controller only needs to close the controllable switch between the initial module group and any one of these nearest normal modules. Continuing the example: the nearest normal module on the left side of the initial module group (M2, M3) is M1, and the nearest normal module on the right side is M4. The main controller can choose to close the controllable switch between M1 and the initial module group, or it can choose to close the controllable switch between M4 and the initial module group, forming a complete module group.

[0078] Figure 6 This is a schematic diagram of the preset connection method of the power module in the fourth example of this application.

[0079] As an example, such as Figure 6 As shown, if power modules M2 and M3 are both malfunctioning and cannot be powered on, and charging interface P1 is connected to the vehicle for charging, then power modules M1 and M4 are allocated. The charging process is as follows: First, power module M1 is powered on. After reaching the preset voltage, the main power switches K1 and K2 at point A are closed to charge the vehicle connected to P1. Further, controllable switches S2 and S3 are simultaneously closed, at which point power modules M2, M3, and M4 form a module group. Then, M4 is powered on at the preset voltage and pre-charges. The output voltage of M4 gradually increases. Because controllable switches S2 and S3 are already closed, the voltages at connection points E, D, and C are the same, and thus the voltages at all three points gradually increase. When the voltage of M4 reaches the pre-charge voltage, controllable switch S1 is closed. The output power of M4, through S3, S2, and S1, combines with the output power of M1 to charge the vehicle connected to P1.

[0080] Compared to handling individual abnormal power modules one by one, the control strategy in this embodiment can complete the assembly and pre-charging of the module group more quickly, shortening the time required for calling, simplifying the control process, reducing the number of switching control commands that the main controller needs to issue, reducing the computational load of the control program, enabling the module group to complete switching more quickly, ensuring the response speed of the charging system, and preventing the charging time from being extended due to the presence of multiple consecutive abnormal power modules, thus balancing charging efficiency and device safety.

[0081] In some implementations, the number of normal power modules closest to the abnormal power module on the charging link is two; controlling the abnormal power module and its closest normal power module on the charging link to form a module group may include: controlling the abnormal power module and any of its closest normal power modules on the charging link to form a module group.

[0082] In some operating conditions, there may be two normal power modules that are the nearest neighbors of the abnormal power module on the charging link. In this case, it is only necessary to connect the abnormal power module with one of the nearest neighbors of the normal power module to form a module group.

[0083] Continue to refer to Figure 6 The charging link of charging interface P1 is: power module M1 - power module M2 - power module M3 - power module M4. If power module M3 is an abnormal power module, while power modules M2 and M4 are normal power modules, the main controller can control the abnormal power module M3 to form a module group with either power module M2 or power module M4.

[0084] When an abnormal power module has two nearest normal power modules, the main controller can choose to connect either one to form a module group. The core advantage of this design is that it avoids unnecessary voltage surges. If the abnormal power module is connected to both normal power modules simultaneously, the voltage of the two normal power modules may differ (e.g., different output power). Closing the double-sided switch may create a circulating current, which would put additional stress on the reverse protection diode of the abnormal module. Choosing to connect only one side completely avoids this risk.

[0085] In some implementations, the charging link has two abnormal power modules separated by only one normal power module; controlling the abnormal power module and its nearest normal power module on the charging link to form a module group may include: controlling the two abnormal power modules to connect with the normal power module between the two abnormal power modules to form a module group.

[0086] In this embodiment, the two abnormal power modules in the charging link are separated by only one normal power module. If each abnormal power module is grouped into a module group, each abnormal power module needs to be combined with the nearest normal power module to form a module group, which would cause the main controller to execute the calling strategy of this application embodiment twice.

[0087] For example, continue to refer to Figure 6The charging link for charging interface P1 is: power module M1 - power module M2 - power module M3 - power module M4. If power modules M1 and M3 are faulty, the main controller will execute the following steps according to the above calling strategy: First, close controllable switch S1 to form module group 1 with modules M1 and M2. Then, the voltage of M2 gradually increases to the preset voltage. Because S1 is closed, the voltages at connection points C and B are the same and gradually increase. Next, close the main power switches K1 and K2 at point A to charge the vehicle connected to P1. Then, close controllable switch S3 to form module group 2 with modules M3 and M4. Then, M4 is powered on, and its output voltage gradually increases to the preset voltage. Because S3 is closed, the voltages at connection points E and D are the same and gradually increase. Finally, close controllable switch S2, and the output power of M4 charges the vehicle connected to P1 through switches S3, S2, and S1.

[0088] Therefore, the main controller needs to execute the calling strategy of this application embodiment twice, which increases the number of switching actions and consumes more control resources. This embodiment connects the two abnormal power modules directly to the intermediate normal power module, and the entire module group can be assembled in a single action.

[0089] Specifically, for example, if the charging link consists of power module M1, power module M2, power module M3, power module M4, and power module M5, where M1 and M5 are faulty power modules, and M2, M3, and M4 are normal power modules, and there are three normal modules between the two faulty modules M1 and M5, then this strategy is not necessary. If the charging link consists of power module M1 (faulty), power module M2 (normal), power module M3 (faulty), and power module M4 (normal), then the two faulty modules M1 and M3 are only separated by one normal power module M2. The main controller only needs to simultaneously close the controllable switches between M1 and M2, and between M2 and M3, to connect M1, M2, and M3 into a complete module group. This eliminates the need to combine M1 with adjacent normal power modules separately, and then combine M3 with adjacent normal power modules. This reduces the number of switching actions, avoids consuming extra power module resources, simplifies the control process, and improves efficiency.

[0090] Figure 7 This is the second flowchart of the invocation control method according to an embodiment of this application. For example... Figure 7 As shown, in some embodiments, the method may further include the following steps: Step 710: Determine the target power module currently undergoing pre-charging and the controllable switch to be closed, and obtain the voltage across the controllable switch to be closed; wherein, the target power module is directly connected to the controllable switch to be closed.

[0091] Step 720: If the voltage at the end of the controllable switch to be closed that is connected to the target power module is less than the voltage at the end of the controllable switch to be closed that is far away from the target power module, then close the controllable switch to be closed.

[0092] It should be noted that the method in this embodiment can be executed by the main controller of the charging system or by the control unit of the power distribution device. Furthermore, the target power module refers to the power module that is currently turned on and has completed pre-charging, and the controllable switch to be closed refers to the controllable switch in the power distribution device that the main controller will next control to close.

[0093] In this embodiment, if the main controller of the charging system executes the calling control method of this application embodiment, the main controller can determine the target power module to be put into operation and the controllable switch that can switch the power module to the charging link of the charging interface according to the power demand of the charging interface. Specifically, the main controller can first determine the number of power modules to be put into operation according to the power demand of the charging interface, and then determine the power module to be put into the charging link according to the switch topology in the power distribution device and the current state of the power module, thereby determining the charging link for the charging interface. The main controller can call the power modules on the charging link in sequence. Each time it is called, the currently called power module is the target power module, and the controllable switch closed to switch the target power module to the charging link is the controllable switch to be closed.

[0094] If the control unit of the power distribution device in the charging system executes the calling control method of this application embodiment, the control unit can determine the target power module and the controllable switch to be closed for pre-charging by receiving the control command issued by the main controller of the charging system. Specifically, after receiving the scheduling command sent by the main controller, the control unit extracts the identifier of the power module to be engaged in this pre-charging and the corresponding controllable switch number to be closed in the charging link, thereby directly obtaining the target power module and the controllable switch to be closed.

[0095] It should be noted that when the calling control method of this application embodiment is executed by different execution entities, only the specific process of determining the target power module to be precharged and the controllable switch to be closed in step 710 is different, and the rest of the process is the same. Therefore, the following will only describe the main controller as the execution entity in detail.

[0096] After identifying the target power module to be pre-charged and the controllable switch to be closed, the main controller can acquire the voltage across the controllable switch. Specifically, a voltage sampling circuit can be set at both ends of each controllable switch in the power distribution device to collect the corresponding port voltage; the voltage collected by the voltage sampling circuit can be output to the main controller or the control unit of the power distribution device via the communication bus.

[0097] After obtaining the voltage across the controllable switch to be closed, the direction of the voltage on the switch after it closes is determined based on this voltage. It can be understood that the voltage at the end of the controllable switch connected to the target power module is the output voltage of the target power module (i.e., the pre-charge voltage); while the end of the controllable switch furthest from the target power module is connected to the charging interface, and therefore the voltage at this end is the charging voltage of the charging interface (i.e., the vehicle's required voltage). Typically, to prevent the vehicle battery voltage from impacting the reverse protection diode on the DC side of the power module due to the power module being connected to the charging link while not powered on, thus causing the diode to break down, the charging system first controls the power module to pre-charge, making the voltage on the DC side of the power module close to the vehicle battery voltage. Furthermore, the pre-charge voltage of the power module needs to be set slightly lower than the vehicle battery's required voltage to prevent the pre-charge voltage from exceeding the vehicle's required voltage, which could cause damage to the vehicle battery.

[0098] Based on this, the embodiments of this application determine whether the pre-charge output voltage of the target power module is actually less than the vehicle's required voltage by judging whether the voltage at the end of the controllable switch to be closed that is connected to the target power module is less than the voltage at the end of the controllable switch to be closed that is far away from the target power module.

[0099] If so, it means that after the controllable switch to be closed is closed, the voltage direction is from the target power module to the charging interface. At this time, after the power module is put into operation, the output voltage of the target power module will be gradually increased by the vehicle side voltage, and there will be no reverse large current surge. Therefore, the controllable switch can be closed directly to formally connect the target power module to the charging link and provide charging power for the vehicle.

[0100] If it is determined that the voltage at the end of the controllable switch to be closed that is connected to the target power module is greater than the voltage at the end furthest from the target power module, it indicates that the current actual pre-charge voltage output by the target power module is already higher than the vehicle battery voltage on the charging interface side. If the controllable switch is closed at this time, a large current surge will occur from the power module to the vehicle battery at the moment of switch closure, threatening the safety of the vehicle battery and charging equipment. In this situation, the main controller can prevent the current controllable switch from being closed, report a pre-charge anomaly in the target power module, and trigger a voltage adjustment or anomaly protection procedure.

[0101] The following is a detailed introduction through a specific example.

[0102] Figure 8 It is a schematic diagram of the preset connection method of the power module in the fifth example of this application. Here, it should be noted that the charging link connection relationship shown in the figure refers to the connection relationship after the DC sides of the power modules are connected in parallel.

[0103] As an example, as Figure 8 shown, P1 is a charging interface, which is connected to the vehicle to charge the vehicle. M1, M2, and M3 are power modules, and S1 and S2 are controllable switches. When P1 is connected to the vehicle for charging, first, the power module M1 is powered on and outputs according to the required voltage and current of the vehicle. Then, the power module M2 is powered on. If the required voltage of the vehicle is 500V, the power-on voltage of the power module M2 should be less than 500V (for example, 490V). When the power module M2 is powered on and the output voltage of the power module M2 reaches the pre-charge voltage, then control the controllable switch S1 to close, so as to prevent the controllable switch from closing before the module is powered on, resulting in the vehicle battery voltage impacting the anti-reverse diode at the front end of the module and causing the anti-reverse diode of the module to be broken down. And the power-on voltage of the power module is set slightly lower than the required voltage of the vehicle battery (for example, 10V lower), so that it can prevent the power-on voltage of the module from being higher than the required voltage of the vehicle, and introducing a large voltage to the vehicle at the moment when the controllable switch S1 is closed, causing vehicle damage. This process is the pre-charge process of the power module.

[0104] However, after the pre-charge of the power module is completed, the main controller cannot determine whether the actual output voltage of the power module is really less than the required voltage of the vehicle.

[0105] Continue to refer to Figure 8 , based on the analysis of the foregoing example, it can be seen that when P1 is the charging interface that is charging, before the controllable switch S1 is closed, the voltage at the A end of the DC side of the power module M2 is 490V, and the voltage at the B end is 500V, so VA < VB. However, when P2 is the charging interface that is charging, the main controller will first control the power module M3 to be powered on, then control the power module M2 to be powered on, and then close the controllable switch S2; further control the power module M1 to be powered on and pre-charge. The pre-charge voltage of the power module M1 is slightly lower than the required voltage of the vehicle, such as 490V; when the power module M1 completes pre-charging, control the controllable switch S1 to close, and the output voltage of the power module M1 gradually rises to the required voltage of the vehicle, 500V. In this case, for the same controllable switch S1, before the controllable switch S1 is closed, the voltage at the A end is 500V, and the voltage at the B end is 590V, so VA > VB. Therefore, for the same controllable switch in different charging links, the voltage directions at its two ends are different.

[0106] Continue to refer to Figure 8 When determining the voltage direction of controllable switch S1, if the power module to be connected to the charging link is power module M2, the voltage at the end of controllable switch S1 connected to power module M2 will be slightly lower than the voltage at the other end of controllable switch S1 because power module M2 needs to be pre-charged. Therefore, by determining which end of controllable switch S1 power module M2 is on (as shown in the figure, M2 is at end A of S1), when checking the voltage across controllable switch S1, the voltages at ends A and B of controllable switch S1 are compared. Controllable switch S1 can only be closed if the voltage at end A is slightly lower than that at end B. If the voltage at end A of controllable switch S1 is detected to be higher than that at end B, controllable switch S1 cannot be closed.

[0107] Therefore, the voltage direction of the switch can be determined without knowing the startup sequence of the charging link and power module. This avoids damage to the vehicle battery due to abnormal output from the power module, ensuring accurate voltage direction identification every time the power module is engaged, preventing damage to the vehicle battery from high-current surges, and improving charging safety. Furthermore, the calling control method in this embodiment can be executed independently of the power module control program in the main controller.

[0108] Figure 9 This is the third flowchart of the invocation control method in an embodiment of this application. Figure 9 As shown, in some embodiments, the method may further include the following steps: Step 910: Determine the controllable switch to be closed.

[0109] Step 920: If it is determined that closing the controllable switch to be closed will form a charging loop, then the closing of the controllable switch to be closed is prohibited; wherein, in the charging loop, at least one power module supplies power to the charging interface through two charging links.

[0110] In this embodiment, after determining the controllable switch to be closed, it is judged whether closing the controllable switch will form a charging loop. If a charging loop will be formed, the possibility of multiple charging ports being connected after the controllable switch is closed is relatively high, so the main controller will prevent the controllable switch from closing. If a charging loop will not be formed, the possibility of multiple charging ports being connected after the controllable switch is closed is relatively low, so the main controller will control the controllable switch to close.

[0111] The following is a detailed explanation using a specific example.

[0112] Figure 10 This is a schematic diagram of the preset connection method of the power module in the sixth example of this application. It should be noted that the charging link connection relationship shown in the figure refers to the connection relationship after the DC side of the power module is connected in parallel.

[0113] As an example, such as Figure 10 As shown, P1 and P2 are charging interfaces, connected to the vehicle to charge it. M1, M2, and M3 are power modules, and S1, S2, and S3 are controllable switches. It's understandable that, to improve the utilization of power modules, the switching topology of the power distribution device is usually designed with multiple power modules connected in pairs. This easily forms a power loop (e.g., ...). Figure 10 (as shown). If Figure 10 When the controllable switches S1, S2, and S3 are all closed, a power loop is formed to charge the charging interface P1. At this time, the power module M3 can be connected to the charging link of P1 through the two paths S2 and S3.

[0114] In practical applications, if charging interface P1 requires power from three modules M1, M2, and M3, the three power modules can be connected to the charging link of charging interface P1 by closing controllable switches S1 and S2; and the three power modules can be connected to the charging link of charging interface P1 by closing controllable switches S1 and S3. However, if controllable switches S1, S2, and S3 are closed simultaneously, then the output power of power module M3 will have two paths for transmission. In this case, the power value passing through controllable switch S1 is uncertain, and the power value passing through controllable switch S1 may exceed its rated power value, thereby causing damage to the switch.

[0115] Furthermore, in complex switching topologies, if most charging ports are charging, and the main controller calls a power module for a specific charging port A, and the called power module is the same one currently being used by charging port B, when the main controller closes the controllable switch corresponding to that power module to switch to the charging link of charging port A, there is a high possibility that the controllable switch connecting that power module to the charging link of charging port B may not be disconnected. In this case, a charging loop may have already formed, and the charging links of the two charging ports may be connected, potentially causing damage to the vehicles connected to charging port A and the vehicles connected to charging port B.

[0116] Continue to refer to Figure 10 As an example, assuming that charging interface P1 is being charged, power modules M1 and M2 are powered on, and after controllable switch S1 is closed, power modules M1 and M2 normally enter the charging link; if the main controller also needs to call power module M3 to charge charging interface P1, the main controller controls power module M3 to be powered on and then controls controllable switch S2 to be closed. At this time, S2 can be closed normally, and power module M3 is connected to the charging link of charging interface P1.

[0117] If both controllable switches S1 and S2 are already closed, and the main controller wants to further control the closure of controllable switch S3, the main controller can first detect whether closing controllable switch S3 will form a charging loop. If the main controller determines that closing controllable switch S3 will form a charging loop, the main controller will not execute the operation of closing controllable switch S3.

[0118] Therefore, this embodiment performs secondary verification by detecting whether the controllable switch to be closed will form a charging loop after being closed, so as to reduce the risk of multiple charging interfaces being connected and to ensure the certainty of the current value passing through each closed controllable switch, preventing switch damage caused by the current exceeding the rated value of the switch, and improving the charging safety of the charging system and electric vehicle.

[0119] Based on the above embodiments, this application also provides a main controller. Figure 11 An example of a schematic diagram of the physical structure of a main controller is shown, such as... Figure 11 As shown, the main controller may include a processor 1110, a communication interface 1120, a memory 1130, and a communication bus 1140. The processor 1110, communication interface 1120, and memory 1130 communicate with each other via the communication bus 1140. The processor 1110 can call logic instructions in the memory 1130 to execute a power module control method. This method includes: determining the charging link of the charging interface based on a preset connection method and the required power of the charging interface, and controlling each power module to supply power to the charging interface sequentially according to the charging link; if an abnormal power module exists in the charging link, controlling the abnormal power module and its nearest normal power module on the charging link to connect to form a module group, and connecting the module group to the charging interface after the normal power module in the module group is pre-charged to a preset voltage.

[0120] Furthermore, the logical instructions in the aforementioned memory 1130 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0121] Based on the above embodiments, this application also provides a charging system, including at least two power modules, at least one charging interface, a power distribution device, and a main controller; the main controller is connected to each power module, each charging interface, and the power distribution device respectively, and the main controller is used to execute the power module calling control method as described above; the power distribution device is connected to each power module and each charging interface respectively.

[0122] It should be noted that for details not disclosed in the charging system of this embodiment, please refer to the details disclosed in the embodiment of the power module calling control method in this specification, which will not be repeated here.

[0123] Based on the above embodiments, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a method for controlling the invocation of power modules provided by the above methods. The method includes: determining the charging link of the charging interface based on a preset connection method and the required power of the charging interface, and controlling each power module to supply power to the charging interface in sequence according to the charging link; if there is an abnormal power module in the charging link, controlling the abnormal power module and the nearest normal power module on the charging link to connect to form a module group, and connecting the module group to the charging interface when the normal power module in the module group is precharged to a preset voltage.

[0124] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0125] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A call control method of a power module, characterized by, The method, applied to a charging system comprising at least two power modules and at least one charging interface, wherein the power modules are connected according to a preset connection method, includes: Based on the preset connection method and the power requirement of the charging interface, the charging link of the charging interface is determined, and each power module is controlled to supply power to the charging interface in sequence according to the charging link; If there is an abnormal power module in the charging link, the abnormal power module and the nearest normal power module on the charging link are connected to form a module group. While controlling the normal power module in the module group to be precharged to a preset voltage, the module group is connected to the charging interface.

2. The call control method of the power module according to claim 1, characterized by, The charging interface is directly connected to the designated power module via a main power switch; If the abnormal power module is a power module directly connected to the charging interface, then connecting the module group to the charging interface includes: The main power switch is closed to connect the module group to the charging interface.

3. The call control method of the power module according to claim 2, characterized by, Each of the power modules is interconnected according to the preset connection method and via a controllable switch; If the abnormal power module is a power module that is not directly connected to the charging interface, then connecting the module group to the charging interface includes: Close the controllable switch connected to the module group near the charging interface to connect the module group to the charging interface.

4. The power module call control method according to claim 3, characterized in that, The abnormal power control module and the nearest normal power module on the charging link are connected to form a module group, including: The module group is formed by controlling the closure of all controllable switches between the abnormal power module and the nearest normal power module on the charging link.

5. The method for controlling the activation of a power module according to any one of claims 1 to 4, characterized in that, The charging link has two or more consecutive abnormal power modules. The abnormal power module and its nearest normal power module on the charging link are connected to form a module group, including: Control the connection of each abnormal power module to form an initial module group, and control the connection of the initial module group and the normal power module on the charging link that is closest to the initial module group to form the module group.

6. The method for controlling the activation of a power module according to any one of claims 1 to 4, characterized in that, The number of normal power modules that are closest to the abnormal power module on the charging link is two. The abnormal power control module and the nearest normal power module on the charging link are connected to form a module group, including: The abnormal power module is connected to any normal power module closest to it on the charging link to form a module group.

7. The method for controlling the activation of a power module according to any one of claims 1 to 4, characterized in that, The charging link contains two abnormal power modules separated by only one normal power module. The abnormal power control module and the nearest normal power module on the charging link are connected to form a module group, including: The two abnormal power modules are connected to the normal power module between the two abnormal power modules to form a module group.

8. The power module call control method according to claim 3, characterized in that, The method further includes: The target power module to be precharged and the controllable switch to be closed are determined, and the voltage across the controllable switch to be closed is obtained; wherein the target power module is directly connected to the controllable switch to be closed; If the voltage at the end of the controllable switch to be closed that is connected to the target power module is less than the voltage at the end of the controllable switch to be closed that is farther away from the target power module, then the controllable switch to be closed is closed.

9. The power module call control method according to claim 3, characterized in that, The method further includes: Identify the controllable switch that needs to be closed; If it is determined that closing the controllable switch to be closed will form a charging loop, then closing the controllable switch to be closed is prohibited; wherein, in the charging loop, at least one power module supplies power to the charging interface through two charging links.

10. A charging system, characterized in that, It includes at least two power modules, at least one charging interface, a power distribution device, and a main controller; The main controller is connected to each of the power modules, each of the charging interfaces and the power distribution device respectively, and the main controller is used to execute the power module calling control method as described in any one of claims 1 to 9; The power distribution device is connected to each of the power modules and each of the charging interfaces respectively.

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