Direct current group charging control system and power switching method thereof

Abstract

The invention provides a direct-current group charging control system and a power switching method thereof, and relates to the technical field of electric vehicle charging, and the control system comprises a data interaction controller, a charging module group, a switch module group, a plurality of charging terminals, a direct-current loop module and a direct-current loop controller. According to the method, a data interaction controller controls a switch module group to realize'full matrix 'type dynamic connection between any charging module and any charging terminal according to the real-time requirement of each terminal, and an idle terminal is electrically isolated by combining a direct current loop module; and power switching is carried out by adopting safety strategies such as double-threshold hysteresis control, voltage pre-synchronization and zero-current breaking. According to the invention, the problems of inflexible power scheduling and insufficient idle terminal safety of the existing group charging system are solved, safe, efficient, stable and dynamic distribution of the charging power in a global range is realized, and the utilization rate and the operation safety of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and in particular to a DC group charging control system and its power switching method. Background Technology

[0002] With the increasing popularity of electric vehicles, DC group charging systems, which can provide fast charging services for multiple vehicles simultaneously, are widely used in charging stations. Compared to single-gun charging piles, DC group charging systems can theoretically improve overall power utilization and charging efficiency by sharing power modules among multiple charging terminals.

[0003] However, most existing mainstream DC group charging systems employ a power allocation scheme with fixed module groups and ring switching. This scheme assigns a fixed group of charging modules to a few terminals, allowing neighboring terminals to "borrow" power only when the associated terminal is idle. The limitation of this model is that the allocation range of power modules is restricted, making it impossible to flexibly schedule power according to the real-time needs of all terminals across the entire system. This results in uneven utilization of power resources within the system, with some terminals having excess power while others have insufficient power, and the overall charging efficiency needs improvement. Furthermore, since the DC circuit of an idle terminal may still be energized when power is borrowed, there is a safety hazard, and maintenance operations become more complex and risky. Summary of the Invention

[0004] To address the technical problems of inflexible global scheduling of power resources and insufficient security of idle terminals in existing technologies, this invention provides a DC group charging control system and its power switching method. By introducing a full matrix switching mode and integrating a DC loop module on the host side, dynamic and safe power allocation within the system is achieved.

[0005] To achieve the above objectives, a first aspect of the present invention provides a DC group charging control system, comprising: a data interaction controller for communicating with a charging platform and serving as the system control hub; The charging module group contains multiple charging modules used to convert AC power to DC power; The switching module group includes multiple power control boards with magnetic latching relays, which are used to establish or disconnect the DC output circuit between any charging module and any charging terminal under the control of the data interaction controller. Multiple charging terminals, each charging terminal including a charging terminal controller and a charging gun, wherein the charging terminal controller is used to obtain the vehicle charging demand through the charging gun and upload it to the data interaction controller; A DC circuit module, located on the host side, includes a DC output contactor corresponding to each charging terminal; and a DC circuit controller for controlling the DC output contactor and monitoring its status.

[0006] Furthermore, the magnetic latching relays within the switch module group are equipped with mutual exclusion control logic to ensure that at most one of the multiple relays corresponding to the same charging module is in a closed state at any given time.

[0007] Furthermore, the switch module group adopts a separate design for the DC output positive plate and negative plate, and the positive and negative plate structures are interchangeable.

[0008] A second aspect of the present invention provides a power switching method for a DC group charging control system based on the first aspect of the present invention, comprising the following steps: The data interaction controller acquires the charging needs of each charging terminal in real time. Based on the charging demand and the status of the charging modules in the system, one or more charging modules are dynamically allocated to the corresponding charging terminals according to the full matrix switching rules, wherein each charging module is only allocated to one charging terminal at the same time. The magnetic latching relays in the switch module group corresponding to the assigned charging module and the target charging terminal are closed to establish a DC output circuit. The dynamic allocation and power switching process follows a predetermined flow logic, including charging start allocation, dynamic power adjustment during charging, and charging stop release of the charging module.

[0009] Furthermore, the charging start-up allocation step includes: After the charging gun is initially connected to the vehicle, the first step is to determine whether there is an idle charging module in the system. If it exists, then an idle charging module will be allocated to the charging gun; If no charging module is available, select the terminal with the largest remaining power from the currently allocated charging terminals, release a charging module, and allocate the released charging module to the charging gun.

[0010] Furthermore, the dynamic power adjustment step during charging includes: When the charging demand of the target charging terminal exceeds the power cut-in threshold and there is an idle charging module that meets the cut-in conditions, the idle charging module is allocated to the target charging terminal. When the charging demand of the target charging terminal is detected to be lower than the power cut-off threshold, one charging module that has been allocated to the target charging terminal will be shut down and released as an idle resource of the system. Wherein, the power cut-in threshold is higher than the power cut-out threshold.

[0011] Furthermore, a safety control step is included before the control switch module group relay switches to or off the charging module: Before power switching, the starting voltage of the charging module to be switched in is matched with the DC circuit voltage of the target charging terminal, and the corresponding relay is closed only after the voltage difference falls within the preset safety range. Before power is cut off, the charging module to be cut off is controlled to stop output, and after confirming that its output current is zero, the corresponding relay is controlled to disconnect.

[0012] A third aspect of the present invention provides an electronic device including a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor executes the program to implement the steps in the power switching method as described in the second aspect of the present invention.

[0013] A fourth aspect of the present invention provides a computer-readable storage medium having a program stored thereon that, when executed by a processor, implements the steps of the power switching method as described in the second aspect of the present invention.

[0014] A fifth aspect of the present invention provides a computer program product including software code, wherein the program in the software code performs the steps of the power switching method as described in the second aspect of the present invention.

[0015] Compared with the prior art, the DC group charging control system and its power switching method provided by the present invention have the following beneficial effects: (1) This invention constructs a full-matrix physical connection network based on the collaborative operation of the switch module group and the data interaction controller. The data interaction controller can receive global demands and, theoretically, dynamically allocate any idle charging module to any charging terminal by controlling the opening and closing of any magnetic latching relay in the switch module group. This design breaks the limitations of traditional fixed grouping or ring switching, enabling power resources to flow flexibly among all terminals as needed, thereby significantly improving the overall power utilization efficiency of the system and the average charging speed of vehicles, and solving the technical problem of uneven utilization caused by inflexible global scheduling of power resources in the prior art.

[0016] (2) This invention integrates a DC output contactor on the host side based on a DC loop module and a DC loop controller. The DC loop controller independently controls the DC output contactor connected to each charging terminal. When a terminal is idle, its corresponding contactor is disconnected, and even if the voltage of the charging module is output to the switch module group, it cannot reach the charging gun of that terminal, thus achieving physical electrical isolation. This eliminates the need to power down the entire system when repairing idle terminals, greatly improving operational safety and system availability.

[0017] (3) The mutual exclusion logic, threshold control, and voltage and current safety steps provided by this invention form a complete safety control strategy. The mutual exclusion logic prevents the same charging module from being mistakenly allocated to multiple terminals simultaneously, avoiding the risk of short circuits. The power cut-in and cut-out thresholds and their hysteresis intervals prevent frequent module switching caused by power demand fluctuations near the critical point, ensuring stable system operation and extending device life. The voltage pre-synchronization and current detection steps ensure that the voltage difference or current across the relay is within a safe range at the moment the relay is closed or opened, effectively preventing damage to the relay and power devices from arcing or surge current. Attached Figure Description

[0018] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0019] Figure 1 This is a schematic diagram of the overall architecture of the DC group charging control system provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the positive power control board circuit of the switching module group in an embodiment of the present invention; Figure 3 This is a schematic diagram of the negative power control board circuit of the switching module group in an embodiment of the present invention; Figure 4 This is a schematic diagram of the threshold for dynamic power adjustment in Embodiment 2 of the present invention; Figure 5 This is an overall flowchart of the power switching method in Embodiment 2 of the present invention. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] All data acquisition in this embodiment is carried out in accordance with laws and regulations and with user consent, and the data is used legally.

[0024] Example 1 like Figure 1 This embodiment provides a DC group charging control system, including: The data interaction controller is used to communicate with the charging platform and serves as the system control center. The charging module group contains multiple charging modules used to convert AC power to DC power; The switching module group includes multiple power control boards with magnetic latching relays, which are used to establish or disconnect the DC output circuit between any charging module and any charging terminal under the control of the data interaction controller. Multiple charging terminals, each charging terminal including a charging terminal controller and a charging gun, wherein the charging terminal controller is used to obtain the vehicle charging demand through the charging gun and upload it to the data interaction controller; A DC circuit module, located on the host side, includes a DC output contactor corresponding to each charging terminal; and a DC circuit controller for controlling the DC output contactor and monitoring its status.

[0025] In this DC group charging control system, the data interaction controller acts as the brain, collecting vehicle demand and the status of various components within the system from the charging terminal controller. The charging module group serves as the power source, providing allocable DC power. The switching module group acts as the nerves and muscles, executing the instructions of the data interaction controller and physically enabling the connection or disconnection of any module to any terminal through its internal matrix-arranged magnetic latching relays. This full-matrix switching architecture breaks the fixed grouping limitation of charging modules, allowing all power resources within the system to be scheduled globally, thus achieving more efficient utilization of charging power and significantly improving the charging efficiency of vehicles. Multiple charging terminals serve as demand sensing and energy delivery interfaces. The DC loop module and controller act as safety guardians, managing the circuit connection to the charging gun. This system architecture solves the technical problem of the inability to centrally schedule and flexibly configure system power resources globally, providing a physical implementation possibility for subsequent intelligent power allocation algorithms and achieving the technical effect of building a highly flexible, globally scalable power hardware platform. Furthermore, both the charging module unit (MDU) and the switching module unit (PDU) can be flexibly configured and expanded in number according to the system power requirements. This excellent scalability lays a solid foundation for future upgrades and expansions to support higher-power liquid-cooled charging guns and other devices.

[0026] Specifically, the magnetic latching relays in the switch module group are equipped with mutual exclusion control logic to ensure that at most one of the multiple relays corresponding to the same charging module is in a closed state at the same time.

[0027] In the control circuit or firmware logic, all relays belonging to the same charging module output path (such as all relays controlling the positive or negative output of the same module) are set as a mutual exclusion group. When it is necessary to close a relay within the group, the control logic will automatically ensure that all other relays in the group are in the open state first. This solves the serious technical problem of DC bus short circuit caused by multiple charging terminals being connected to the same charging module simultaneously due to control abnormalities or misoperations during dynamic switching. It achieves the technical effect of fundamentally eliminating short circuit risk from the hardware logic level and ensuring the basic operational safety of the system.

[0028] Specifically, the switch module group adopts a separate design for the positive and negative DC output plates, and the structures of the positive and negative plates are interchangeable.

[0029] The relay clusters connecting to the positive and negative DC output terminals of the charging module are placed on two separate power control boards with identical circuit layouts. This design, where the DC output positive and negative PDUs are separated and universally compatible, effectively reduces the size and complexity of a single power control board while maintaining the total number of relays and switching functions required by the system. This lowers PCB manufacturing costs and reduces the difficulty of heat dissipation design, further improving the integration of the entire charging host system and reducing subsequent maintenance costs. This design solves the technical problems of large PCB area, high cost, concentrated heat dissipation, and inconvenient maintenance caused by centralized positive and negative relay design on a single board, due to high requirements for electrical clearance and creepage distance, as well as complex wiring. Through this separate and universal design, the technical effects of simplifying single-board design complexity, improving the universality of board production and maintenance, and optimizing system heat dissipation layout are achieved, thereby reducing manufacturing costs and improving reliability.

[0030] Furthermore, this invention integrates the DC output contactors connecting each charging terminal into the DC circuit module on the host side. Compared to the traditional approach of distributing contactors within each charging terminal, this invention, through centralized design, eliminates the need for bulky components such as high-current contactors inside the charging terminal, thereby significantly reducing the physical size and footprint of the terminal.

[0031] Example 2 This embodiment provides a power switching method based on the DC group charging control system described in Embodiment 1 of the present invention, including the following steps: The data interaction controller acquires the charging needs of each charging terminal in real time. Based on the charging demand and the status of the charging modules in the system, one or more charging modules are dynamically allocated to the corresponding charging terminals according to the full matrix switching rules, wherein each charging module is only allocated to one charging terminal at the same time. The magnetic latching relays in the switch module group corresponding to the assigned charging module and the target charging terminal are closed to establish a DC output circuit. The dynamic allocation and power switching process follows a predetermined flow logic, including charging start allocation, dynamic power adjustment during charging, and charging stop release of the charging module.

[0032] The data interaction controller continuously executes a "perception-decision-execution" cycle. "Perception" involves acquiring global demand and resource status in real time; "decision" calculates the optimal or suboptimal module allocation scheme based on full matrix rules, ensuring each module is dedicated to a single terminal; and "execution" drives the switching module group and DC loop controller to complete the physical connection. This process solves the technical problems of rigid power allocation strategies and inability to respond to real-time global changes in traditional solutions. It transforms the hardware capabilities of Example 1 into actual "on-demand allocation" intelligent scheduling capabilities, achieving the technical effect of improving overall system energy efficiency and response speed. Specifically, during the dynamic allocation of charging power, the DC output of the charging module must sequentially pass through the switching of the switching module group (PDU) and the on / off state of the contactor in the DC loop module before reaching the charging gun of the target charging terminal. This design creates dual electrical isolation between the charging module and the terminal charging gun: the PDU (relay) and the DC output module (contactor). When a terminal is idle, even if a power module is allocated to its corresponding PDU output port, as long as the DC output contactor corresponding to that terminal is open, high-voltage DC power cannot reach the terminal side. This allows for the inspection and maintenance of any idle terminal without shutting down the entire charging system, greatly improving the overall availability and operational efficiency of the equipment, while completely eliminating the safety hazards caused by an idle terminal being charged.

[0033] Specifically, the charging start-up allocation step includes: After the charging gun is initially connected to the vehicle, the first step is to determine whether there is an idle charging module in the system. If it exists, then an idle charging module will be allocated to the charging gun; If no charging module is available, select the terminal with the largest remaining power from the currently allocated charging terminals, release a charging module, and allocate the released charging module to the charging gun.

[0034] When a new vehicle connects and the system has no available modules, the algorithm doesn't simply queue it. Instead, it proactively searches among already charging vehicles for the terminal with the "maximum remaining power" (i.e., the one whose currently allocated power exceeds its actual demand the most) and reclaims one of its modules. This strategy solves the technical problem of new charging requests not being responded to immediately when the system is at full load, leading to a decline in user experience. Through dynamic "peak shaving and valley filling" adjustments, it ensures that newly connected vehicles can quickly obtain basic charging power, maximizing system resource utilization, reducing user waiting time, and improving service fairness.

[0035] Specifically, the dynamic power adjustment step during charging includes: When the charging demand of the target charging terminal exceeds the power cut-in threshold and there is an idle charging module that meets the cut-in conditions, the idle charging module is allocated to the target charging terminal. When the charging demand of the target charging terminal is detected to be lower than the power cut-off threshold, one charging module that has been allocated to the target charging terminal will be shut down and released as an idle resource of the system. Wherein, the power cut-in threshold is higher than the power cut-out threshold.

[0036] Each charging terminal is assigned a higher power input threshold and a lower power output threshold. When the terminal demand consistently exceeds the power input threshold, an "add module" process is triggered; when the demand consistently falls below the power output threshold, a "remove module" process is triggered; when the demand falls between the two, the status quo is maintained. This mechanism solves the technical problem of frequent module activation and deactivation (i.e., "oscillation") caused by normal fluctuations in vehicle power demand. The "hysteresis interval" formed by the dual thresholds acts as a buffer, effectively filtering short-term fluctuations and triggering redistribution only when demand changes significantly and continuously. This achieves the technical effects of significantly improving system control stability, reducing relay mechanical wear, and extending equipment life.

[0037] Specifically, before the control switch module group relays switch into or out of the charging module, a safety control step is also included: Before power switching, the starting voltage of the charging module to be switched in is matched with the DC circuit voltage of the target charging terminal, and the corresponding relay is closed only after the voltage difference falls within the preset safety range. Before power is cut off, the charging module to be cut off is controlled to stop output, and after confirming that its output current is zero, the corresponding relay is controlled to disconnect.

[0038] Before "cutting in," the output voltage of the charging module to be put into operation is "pre-synchronized" to near the target circuit voltage, greatly reducing the voltage difference at the moment of closing and thus suppressing inrush current. Before "cutting out," it is ensured that the module to be cut off has stopped outputting and the current is zero, achieving "zero-current interruption." These steps solve the technical problems of potentially huge electric arcs and electromagnetic shocks that may occur during differential voltage closing or current interruption, which could damage key components such as relay contacts and power module IGBTs. Through precise timing and state control, the system achieves the technical effect of ensuring that every power switching operation is safe and smooth, greatly improving the long-term operational reliability of the system.

[0039] In one specific embodiment, refer to Figures 1 to 5 , Figure 1 The overall framework diagram of the DC group charging system has been clarified. Figure 2 and Figure 3 The internal circuit principle and external wiring principle of the switch module have been clarified. Figure 4 The switching thresholds during power switching have been clarified. Figure 5 The power switching logic during equipment operation has been clarified.

[0040] Firstly, based on Figure 1 The main components of a DC group charging system are explained below: The AC input from the low-voltage section of the transformer is input to the charging module group (MDU) after passing through the AC circuit breaker. The charging module group is a power conversion unit containing multiple charging modules (the number of modules can be set, MDU1, MDU2, MDU3, etc.). Each charging module provides an AC input interface and a DC output interface (DC output positive and DC output negative), which can convert the input AC power into DC power and output it.

[0041] The DC output of the module group will enter the switching module group (PDU). The switching module group is a power switching unit containing multiple power control boards (the number of power control boards can be set, PDU1, PDU2, PDU3, etc.), such as Figure 2 Each switch module shown contains 16 magnetic latching relays, and full matrix power switching with 2 inputs and 8 outputs is achieved by controlling the magnetic latching relays.

[0042] Specifically, such as Figure 3 Each switch module shown contains two DC input ports, supporting unipolar input of two charging modules. The polarity of the two inputs of each switch module is the same, that is, each switch module corresponds to the positive or negative output of two charging modules. It contains eight sets of output interfaces, which are connected to the positive or negative terminals of the DC output circuit.

[0043] The upper limit of the entire DC group charging system can be adjusted by changing the number of MDUs and PDUs in the system.

[0044] The PCU (Power Control Unit) is the upper-level control unit of the DC charging host. It interacts with the cloud platform via a wireless 4G module, communicates with the CCU and DCU via the Modbus UDP protocol, and communicates with the MDU and PDU via CAN 2.0. The PCU schedules the working status of the MDU according to system presets, vehicle charging needs, and remaining power, and simultaneously triggers the corresponding PDU to switch the DC circuit.

[0045] Specifically, the PCU can dynamically monitor the output status of the charging module group and the load of the charging vehicle. While ensuring all charging guns can operate normally, it dynamically and intelligently allocates power. During charging, if the demand of a vehicle corresponding to a particular charging gun increases, and the existing module power cannot meet that demand, the PCU will utilize an idle module. By controlling the PDU, it will establish a DC circuit between the idle module and the charging gun, achieving dynamic power replenishment. If the demand of a vehicle corresponding to a particular charging gun decreases, the PCU will control the PDU to disconnect the connection circuit between the excess charging module and the charging gun, and shut down the charging module, making it available for use by other charging guns, achieving dynamic power recovery. Through these methods of dynamic power switching, the system achieves "group management and control, flexible charging, power sharing, and dynamic allocation," comprehensively improving the vehicle's charging efficiency.

[0046] The DC loop controller (DCU) controls and acquires the status of the DC output contactors in the DC loop module, and simultaneously acquires the voltage inside and outside the DC output contactors through an ADC sampling circuit. Each DCU can control and acquire data for four DC outputs simultaneously. Due to the existence of this partition, when the charging terminal is idle, the voltage borrowed from the MDU output cannot enter the DC output terminal, improving the safety of the equipment in idle conditions.

[0047] The charging terminal controller (CCU) communicates with the vehicle via the charging gun (GUN) to obtain vehicle demand-related information in real time and transmit it to the PCU via the network cable.

[0048] Through the above framework, the DC group charging system realizes independent power supply and group control of multiple modules and multiple DC circuits, providing a structural foundation for the subsequent realization of full matrix switching mode and dynamic power scheduling control.

[0049] Secondly, the implementation method of the full matrix scheme provided by the present invention will be described in detail: in accordance with Figure 2 and Figure 3The PDU clearly adopts a design with separate positive and negative output boards for DC output, and each pole uses a 2-input, 8-output design. The positive and negative PDUs are distinguished by CAN communication addresses. The positive PDU starts with 0xB0 and the negative PDU starts with 0xD0. When the PCU controls the closing or opening of a specified circuit, it is necessary to control the relays of the positive and negative PDUs at the same time to form a DC circuit.

[0050] in accordance with Figure 5 As shown, when the charging gun is in an idle state, the charging gun does not have a fixed MDU. When the charging gun is connected to the vehicle, the PCU determines the operating status of the charging module, finds an idle charging module and assigns it to the gun, and controls the PDU to close the relay of the corresponding circuit (for example: when GUN4 is connected to the vehicle, MDU2 is idle and assigned, PDU1+:KM8 and PDU1-:KM8 should be closed), so that the MDU establishes a connection with the corresponding GUN.

[0051] If the PCU determines that there are no available modules in the entire system, the PCU will detect the assigned modules, find the charging gun with the largest remaining power, control it to remove a charging module, and control the PDU to control the relay of the original circuit to disconnect the MDU from the original GUN. Then, the PCU will allocate the MDU to this gun and control the PDU to control the relay of this circuit to ensure that this gun has a charging module available and the power replenishment function is normal.

[0052] During charging, if the demand of a charging gun increases, exceeding the power input threshold, and the PCU finds an available module, and the change in the module's status will not affect the normal use of other terminals, the PCU assigns the available module to that charging gun and controls the PDU to close the corresponding relay, establishing a connection between the input MDU and the corresponding GUN. At this point, the power of the available module can be supplied to that charging gun. During charging, if the demand of a charging gun continuously decreases, falling below the power output threshold, the PCU searches backwards for the charging module occupied by that gun, shuts down and outputs the last occupied charging module, and controls the PDU to open the corresponding relay, disconnecting the output MDU from the corresponding GUN. The output MDU can then be used by other GUNs. When the charging gun's demand is between the power input and output thresholds, it is within the power maintenance range. The charging gun uses the existing charging module for output, maintaining the currently occupied power without switching.

[0053] Clearly, whether the PDU relay is closing or opening, a large voltage difference across the relay will generate a transient current, damaging the PDU. Therefore, during power switching in charging, the PCU needs to preprocess the charging module's operating status. In power-on mode, the PCU first sets the idle module's startup voltage to the DC output circuit voltage of that charging gun. Only after detecting that the module's output voltage is within the -1 to 10V range of that gun's circuit voltage should the PCU control the PDU to close the corresponding relay. In power-off mode, the PCU first stops the charging module's output. Only after detecting that the disconnected module has no current output should the PCU control the PDU to open the corresponding relay. Under no circumstances should the PDU be controlled when the voltage difference is too large.

[0054] During charging, each charging module is only allowed to be assigned to one charging gun at a time; otherwise, it will cause a short circuit between vehicles, resulting in vehicle malfunction. To prevent this problem, the magnetic latching relays within the PDU have a mutual exclusion mechanism, meaning that only one magnetic latching relay corresponding to the same module is allowed to close at a time. The PDU implements this mechanism by collecting feedback from the magnetic latching relays to determine their status. Figure 3 For example, the relays corresponding to MDU1 are KM1, KM3, KM5, KM7, KM9, KM11, KM13, and KM15. If any one of them is closed, the rest cannot be closed. The same applies to the relays corresponding to MDU2.

[0055] During power switching, the PCU incorporates a power switching threshold mechanism suitable for this solution. This mechanism includes a power in-threshold and a power out-threshold. The power in-threshold determines whether to trigger a new action from the charging module, while the power out-threshold determines whether to trigger a reduction action. A clear safety range is established between the power in-threshold and power out-threshold to ensure a stable control loop and avoid repeated switching near the power critical point. This mechanism effectively improves the stability of the DC group charging system and significantly extends the lifespan of the charging modules.

[0056] Finally, as Figure 1 As shown, compared to ordinary DC group charging systems, the DC group charging system of the present invention has a separate DC output module. This module contains multiple sets of DC output contactors for the charging guns. When the terminal is in an idle state, the DC output contactor of the corresponding DC circuit is in an open state, and the DC output of the charging module can only reach the DC circuit module, thereby keeping the terminal in a safe state. This allows for uninterrupted maintenance of the terminal without affecting the system operation, improving the overall perception and experience of the user.

[0057] Example 3 Embodiment 3 of the present invention provides an electronic device.

[0058] An electronic device includes a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor executes the program to implement the steps in the power switching method as described in Embodiment 2 of the present invention.

[0059] The detailed steps are the same as the power switching method provided in Example 2, and will not be repeated here.

[0060] Example 4 Embodiment 4 of the present invention provides a computer-readable storage medium.

[0061] A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the power switching method as described in Embodiment 2 of the present invention.

[0062] The detailed steps are the same as the power switching method provided in Example 2, and will not be repeated here.

[0063] Example 5 Embodiment 5 of the present invention provides a computer program product.

[0064] A computer program product includes software code, wherein the program in the software code performs the steps of the power switching method as described in Embodiment 2 of the present invention.

[0065] The detailed steps are the same as the power switching method provided in Example 2, and will not be repeated here.

[0066] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0067] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0068] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0069] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0070] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A direct current group charge control system, characterized by, The application relates to a charging system, comprising: a data interaction controller for communicating with the charging platform and serving as a system control center; a charging module group containing multiple charging modules for converting alternating current into direct current; a switch module group containing multiple power control boards with magnetic latching relays for establishing or breaking a direct current output loop between any charging module and any charging terminal under the control of the data interaction controller; multiple charging terminals, each comprising a charging terminal controller and a charging gun, the charging terminal controller being used for obtaining vehicle charging requirements through the charging gun and uploading the requirements to the data interaction controller; a direct current loop module arranged on the host side and containing direct current output contactors corresponding to the charging terminals; and a direct current loop controller for controlling the direct current output contactors and monitoring the states of the contactors.

2. The system of claim 1, wherein, The magnetic latching relays in the switch module group are provided with mutual exclusion control logic, which ensures that at most one of the multiple relays corresponding to the same charging module is in a closed state at the same time.

3. The system of claim 1, wherein, The switch module group adopts a direct current output positive plate and negative plate split design, and the positive plate and negative plate structures are universal.

4. A power switching method based on the DC group charge control system according to any one of claims 1 to 3, characterized by, The application further relates to a charging method, comprising the following steps: obtaining the charging requirements of the charging terminals in real time by the data interaction controller; dynamically allocating one or more charging modules to the corresponding charging terminals according to the full matrix switching rule based on the charging requirements and the states of the charging modules in the system, wherein each charging module is only allocated to one charging terminal at the same time; controlling the magnetic latching relays in the switch module group corresponding to the allocated charging module and the target charging terminal to be closed to establish a direct current output loop; wherein the dynamic allocation and power switching process follows a predetermined process logic, including charging start allocation, charging power dynamic adjustment and charging stop releasing charging modules.

5. The method of claim 4, wherein, The charging start allocation step comprises: after the charging gun is initially connected with the vehicle, firstly judging whether there is an idle charging module in the system; if yes, allocating an idle charging module to the charging gun; if no, selecting the charging terminal with the maximum remaining power from the charging terminals of the currently allocated charging modules to release a charging module, and allocating the released charging module to the charging gun.

6. The method of claim 5, wherein, The charging power dynamic adjustment step comprises: when it is detected that the charging requirement of the target charging terminal exceeds the power cut-in threshold value and there is an idle charging module meeting the cut-in condition, allocating the idle charging module to the target charging terminal; when it is detected that the charging requirement of the target charging terminal is lower than the power cut-out threshold value, stopping and releasing a charging module allocated to the target charging terminal as an idle resource of the system; wherein the power cut-in threshold value is higher than the power cut-out threshold value.

7. The method of claim 6, wherein, Before controlling the relays of the switch module group to cut in or cut out the charging modules, a safety control step is further included: before power cut-in, controlling the start voltage of the charging module to be cut in to match the direct current loop voltage of the target charging terminal, and then controlling the corresponding relay to be closed after the voltage difference falls within a preset safety range; before power cut-out, controlling the charging module to be cut out to stop output, and then controlling the corresponding relay to be disconnected after confirming that the output current is zero.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The processor, when executing the program, realizes the steps of the power switching method as claimed in any one of claims 4 to 7.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by the processor, realizes the steps of the power switching method as claimed in any one of claims 4 to 7.

10. A computer program product comprising software code, characterized in that, The program in the software code performs the steps of the power switching method as claimed in any one of claims 4 to 7.

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