Method and system for transmitting available real-time current of electric vehicle charger

Abstract

A method and system for delivering real-time current available to an electric vehicle charger is provided in which a power line communication device measures the total current flowing through one or more power lines that provide power to the EV charger. The device establishes communication with at least one EV charger using one or more power lines as a communication medium. The device also transmits the power management information to an electric vehicle charger. When the device receives a request from the EV chargers, it calculates the current for each EV charger based on the total current, the preset maximum current, or both the total current and the preset maximum current, and sends the calculated current to each EV charger. Alternatively, the device may provide a total current to one of the EV chargers acting as a power manager and communicate power management information to the other EV chargers using one or more power lines as a communication medium.

Description

Technical Field The present invention relates to load balancing for charging electric vehicles (EVs) using power line communications, and more particularly to a method and system for transmitting real-time current available to an electric vehicle charger. This application is based on the priority of U.S. Provisional Patent Application No. 63 / 516539 filed on July 31, 2023, the entire contents of which are incorporated herein by reference. Background Art Installing an EV charger in a parking lot or parking garage requires a lot of work. Not only does it require connecting the power lines, but it also requires establishing communication between the EV charger and the cloud. For wired communication, you usually need to install an Ethernet cable or RS485 cable to connect the EV charger to the cloud through a gateway. For wireless communication, you usually need to install WiFi (IEEE 802.11) or a cellular network to connect the EV charger to the cloud. Both methods require an electronic engineer to install and set up the EV charger. This prolongs the installation time and increases the installation cost. Summary of the invention According to a first aspect, the present application provides a system for transmitting real-time current available to an electric vehicle (EV) charger, comprising: a power line communication device for: measuring the total current flowing through one or more power lines that power m electric vehicle chargers, and establishing communication with one or more of the m EV chargers using the one or more power lines as a communication medium. In some embodiments, the power line communication device further comprises a preset maximum current for the one or more power lines. In some embodiments, the power line communication device establishes communication with each of n chargers among the m EV chargers. The power line communication device also receives a power request from the charger, The power line communication device calculates the current of each of the n chargers based on the total current, the preset maximum current, or both the total current and the preset maximum current, and The power line communication device transmits the calculated current to each charger in the n nodes. In some embodiments, the power line communication device calculates the current of each of the n chargers based on a first-in-first-out principle. In some embodiments, the power line communication device calculates the current of each of the n chargers based on a phase awareness algorithm. In some embodiments, the power line communication device calculates the current of each of the n chargers by evenly distributing the total current among the n chargers. In some embodiments, the system further comprises a power management EV charger, wherein the power management EV charging device is one of the m EV chargers, The power line communication device transmits the total current, the preset maximum current, or both the total current and the preset maximum current to the power management EV charger, The power management EV charger uses one or more power lines as the communication medium to establish communication with each of the n chargers of m-1 chargers, where n≤m-1, The power-managed EV charger also receives power requests from the n chargers, the power-managed EV charging device calculates a current for each of the n chargers from the total current, the preset maximum current, or the total current and the preset maximum current, and the power-managed EV charger transmits the calculated current to each of the n EV chargers. In some embodiments, the power management EV charger calculates the current of each of the n chargers based on a first-in, first-out principle. In some embodiments, the power management EV charger calculates the current of each of the n chargers based on a phase awareness algorithm. In some embodiments, the power-managed EV charger calculates the current for each of the n chargers by evenly distributing the total current among the n chargers. According to a second aspect, the present application provides a method for communicating real-time current available to an electric vehicle (EV) charger, comprising: measuring a total current flowing through one or more power lines that provide power to m electric vehicle chargers using a power line communication device, and establishing communications with one or more of the m EV chargers using the power line communication device, using the one or more power lines as a communication medium. In some embodiments, a power line communication device establishes communication with each of n chargers among the m EV chargers, the power line communication device also receives a power request from the n chargers, the power line communication device calculates a current of each of the n chargers based on a total current, a preset maximum current, or both the total current and the preset maximum current, and the power line communication device transmits the calculated current to each charger among the n nodes. In some embodiments, the power line communication device calculates the current of each of the n chargers based on a first-in-first-out principle. In some embodiments, the power line communication device calculates the current of each of the n chargers based on a phase awareness algorithm. In some embodiments, the power line communication device calculates the current of each of the n chargers by evenly distributing the total current among the n chargers. In some embodiments, the m EV chargers include a power management EV charger, the power line communication device transmits the total current, the preset maximum current, or both the total current and the preset maximum current to the power management EV charger, and the power management EV charger establishes communication with each of the n chargers of the m-1 EV chargers using one or more power lines as a communication medium, where n≤m-1; The power-managed EV charger also receives power requests from the n chargers, the power-managed EV charging device calculates a current for each of the n chargers from the total current, the preset maximum current, or the total current and the preset maximum current, and the power-managed EV charger transmits the calculated current to each of the n EV chargers. In some embodiments, the power management EV charger calculates the current of each of the n chargers based on a first-in, first-out principle. In some embodiments, the power management EV charger calculates the current of each of the n chargers based on a phase awareness algorithm. In some embodiments, the power-managed EV charger calculates the current for each of the n chargers by evenly distributing the total current among the n chargers. According to a second aspect, the present application provides a computer program product, including a non-transitory tangible computer-readable storage medium, the content of which causes a processor to execute a method for transmitting real-time current available to an electric vehicle (EV) charger, comprising: providing a system, wherein the system includes one or more different software modules, and wherein the different software modules include a measurement module and a communication module; measuring the total current flowing through one or more power lines that provide power to m electric vehicle chargers using the measurement module; and using the communication module, using the one or more power lines as a communication medium, establishing communication with one or more of the m EV chargers. The power line communication device of the present application measures the total current flowing through one or more power lines that provide power to the EV charger. The device uses one or more power lines as a communication medium to establish communication with at least one EV charger. The device also transmits power management information to the electric vehicle charger. When the device receives a request from the EV charger, it calculates the current of each EV charger based on the total current, the preset maximum current, or both the total current and the preset maximum current, and transmits the calculated current to each EV charger. Alternatively, the device can provide the total current to one of the EV chargers acting as a power manager and use one or more power lines as a communication medium to transmit power management information to other EV chargers. BRIEF DESCRIPTION OF THE DRAWINGS Those skilled in the art will appreciate that the drawings described below are for illustration purposes only and are not intended to limit the scope of the present teachings in any way. Figure 1 is a block diagram illustrating a computer system on which embodiments of the present application may be implemented. Figure 2 is an exemplary diagram illustrating a static load balancing method in a fully occupied parking lot. Figure 3 is an exemplary schematic diagram illustrating a static load balancing method in a partially occupied parking lot. Figure 4 is an exemplary diagram illustrating a dynamic load balancing method having two charging vehicles in wireless communication. Figure 5 is an exemplary diagram showing a dynamic load balancing method having wireless communication when four charging vehicles are connected Figure 6 is an exemplary diagram illustrating a dynamic load balancing method with three charging vehicles in wireless communication. Figure 7 is an exemplary diagram illustrating a dynamic load balancing method with power line communication when there are two charging vehicles, according to various embodiments. Figure 8 is an exemplary diagram illustrating a dynamic load balancing method with power line communication when there are four charging vehicles, according to various embodiments. Fig. 9 is an exemplary diagram illustrating a dynamic load balancing method with power line communication when there are three charging vehicles, according to various embodiments. Fig.10 is a flow chart illustrating a real-time communication method. Fig.11 is a schematic diagram of a system that includes one or more different software modules and implements a method for providing real-time available current to an EV charger according to various embodiments. Before describing one or more embodiments of the present invention in detail, it will be understood by those skilled in the art that the present invention is not limited to the construction details, the arrangement of components and the arrangement of steps shown in the following detailed description or the accompanying drawings. In addition, it should be understood that the words and terms used herein are for the purpose of description and should not be regarded as limiting. DETAILED DESCRIPTION Computer-implemented systems Figure 11 is a block diagram illustrating a computer system 100 upon which embodiments of the present teachings may be implemented. The computer system 100 includes a bus 102 or other communication mechanism for communicating information, and a processor 104 coupled to the bus 102 for processing information. The computer system 100 also includes a memory 106, which may be a random access memory (RAM) or other dynamic storage device, coupled to the bus 102 for storing instructions to be executed by the processor 104. The memory 106 may also be used to store temporary variables or other intermediate information during execution of instructions by the processor 104. The computer system 100 also includes a read-only memory (ROM) 108 or other static storage device coupled to the bus 102 for storing static information and instructions for the processor 104. A storage device 110, such as a magnetic disk or optical disk, is provided and coupled to the bus 102 for storing information and instructions. The computer system 100 may be coupled via the bus 102 to a display 112, such as a cathode ray tube (CRT) or a liquid crystal display (LCD), for displaying information to a computer user. An input device 114, including alphanumeric and other keys, is coupled to the bus 102 for communicating information and command selections to the processor 104. Another type of user input device is a cursor controller 116, such as a mouse, trackball, or cursor direction keys, for communicating direction information and command selections to the processor 104 and for controlling cursor movement on the display 112. The computer system 100 can perform the present teachings. According to some implementations of the present teachings, the computer system 100 provides results in response to the processor 104 executing one or more sequences of one or more instructions contained in the memory 106. Such instructions can be read into the memory 106 from another computer-readable medium such as the storage device 110. Execution of the sequences of instructions contained in the memory 106 causes the processor 104 to perform the processes described herein. Alternatively, the present teachings may be implemented using hardwired circuits instead of or in combination with software instructions. For example, the present teachings may also be implemented using a programmable artificial intelligence (AI) chip that programs only the encoder neural network to achieve performance and reduce costs. Therefore, implementation of the present teachings is not limited to any specific combination of hardware circuits and software. As used herein, the terms "computer-readable medium" or "computer program product" refer to any medium that participates in providing instructions to processor 104 for execution. In this written description, the terms "computer-readable medium" and "computer program product" may be used interchangeably. Such media may take a variety of forms, including, but not limited to, non-volatile media and volatile media. Non-volatile media include, for example, optical or magnetic disks, such as storage device 110. Volatile media include dynamic memory, such as memory 106. Common forms of computer readable media include, for example, floppy disks, diskettes, hard disks, magnetic tapes or any other magnetic media, CD-ROMs, Digital Video Discs (DVDs), Blu-ray Discs, any other optical media, thumb drives, memory cards, RAM, PROMs and EPROMs, FLASH-EPROMs, any other memory chips or cassettes, or any other tangible media from which a computer can read. Various forms of computer readable media may be involved in carrying one or more sequences of instructions to processor 104 for execution. For example, the instructions may initially be stored on a disk of a remote computer. The remote computer can load the instructions into its dynamic memory and send the instructions over a telephone line using a modem. A modem local to computer system 100 can receive the data on the telephone line and use an infrared transmitter to convert the data to an infrared signal. An infrared detector coupled to bus 102 can receive the data carried in the infrared signal and place the data on bus 102. Bus 102 transfers the data to memory 106, from which processor 104 retrieves and executes the instructions. The instructions received by memory 106 may optionally be stored on storage device 110 before or after execution by processor 104. According to various embodiments, instructions configured to be executed by a processor to perform a method are stored on a computer-readable medium. A computer-readable medium may be a device that stores digital information. The computer-readable medium is accessed by a processor adapted to execute the instructions configured to be executed. For the purpose of illustration and description, the following description of various implementations of the present teaching has been given. It is not exhaustive and does not limit the present teaching to the precise form disclosed. Modifications and variations are possible in accordance with the above teachings or can be obtained from the practice of the present teachings. In addition, the implementation described includes software, but the present teaching can be implemented as a combination of hardware and software or hardware alone. The present teaching can be implemented with object-oriented and non-object-oriented programming systems. Local dynamic load balancing for electric vehicle charging using power line communication As mentioned above, installing an EV charger in a parking lot or parking garage requires a lot of work. It not only requires connecting the power line, but also requires establishing communication between the EV charger and the cloud. Each building or charging location has a different and limited amount of EV charging power. Each building or charging location can also have a different number of EV chargers. In the following non-limiting example, there are five EV chargers installed in a parking lot, and the maximum power allocated to these EV chargers is 100A. Figure 2is an example diagram 200 showing a static load balancing method in a fully occupied parking lot. Each EV charger receives the same fixed power of 20A, which is provided to each EV charger. When there are five charging vehicles, each charging vehicle is allocated 20A, and the available power is evenly distributed.

[0030] Figure 3 is an example diagram 300 showing a static load balancing method in a partially occupied parking lot. Each EV charger receives the same fixed amount of power. For example, 20A is provided to each EV charger. When there are two charging vehicles, three EV chargers are idle. Each charging vehicle is allocated 20A, and 60A is unused. Therefore, the available power is not optimally distributed. Figure 4 is an example diagram 400 showing a dynamic load balancing method using WiFi communication when there are two charging carts. Electric vehicle chargers with WiFi communication capabilities can easily connect to the WiFi network through a WiFi router. All electric vehicle chargers communicate with the cloud or computer server through the WiFi communication network. If the electric vehicle charger has cellular communication capabilities, it can be directly connected to the cloud without a router. The central management system in the cloud communicates with all electric vehicle chargers and notifies that there are two charging carts and three idle electric vehicle chargers. The central management system then sends a message to the two electric vehicle chargers with charging carts. The maximum allocated current is 100A. This current is dynamically allocated to the two charging carts, and each charging cart is allocated 50A. The available power is then optimally allocated. Figure 5 is an example diagram 500 showing a dynamic load balancing method using WiFi communication when there are four charging vehicles. When two vehicles are charging and two more vehicles arrive, the associated electric vehicle chargers notify the central management system in the cloud. The central management system then sends a message to the four electric vehicle chargers with charging vehicles. Then, the four charging vehicles are each allocated 25A. Figure 6 is an example diagram 600 showing a dynamic load balancing method using WiFi communication when there are three charging vehicles. When the car is fully charged, the associated electric vehicle charger notifies the central management system in the cloud. The central management system then sends a message to the three electric vehicle chargers and the remaining charging vehicles. Then, 33A is dynamically allocated to the remaining three charging vehicles. The disadvantage of this method is that dynamic load balancing will not be possible if the Internet or the cloud fails. In various embodiments, dynamic load balancing is provided using power line communications. Power line communications uses power lines as a medium for sending and retrieving information. There is no need to lay new communication lines. It only requires the power lines to be installed by a certified electrician. It reduces installation time and reduces installation costs while providing a reliable and robust network. Electric vehicle chargers with power line communications capabilities connect to the power line communications network as easily as they connect to a power source on the power line. Figure 7 is an example diagram 700 showing a dynamic load balancing method using power line communication when there are two charging vehicles according to various embodiments. The power line communication module or device 710 uses, for example, a current transformer meter 715 to measure the real-time total current flowing from the power grid to the electric vehicle chargers 721-725. The maximum total current that can be provided to the EV chargers 721-725 connected to the power line is preset in the power line communication device. The power line communication device 710 acts as a power manager that can intelligently allocate available power based on the real-time needs of the vehicles. This method supports more electric vehicles and dynamically allocates power to each electric vehicle in the most efficient manner without connecting to the cloud. The power line communication device 710 may include a processor, a controller, or a computer system, such as Figure 1 computer system. The electric vehicle chargers 721-725 communicate with the power line communication device 710 via the power line 730. The power line communication device 710 is notified that there are two charging vehicles and three idle EV chargers 723-725. The power line communication device 710 then sends a message to the EV chargers 721-722 with charging vehicles. The maximum distribution current is 100A, and the two charging vehicles are each allocated 50A. The available power is optimally distributed. Figure 8 is an example diagram showing a dynamic load balancing method with power line communication when there are four charging vehicles according to various embodiments. When two vehicles are charging, two more vehicles arrive, and the related EV chargers 723-724 notify the power line communication device 710. Then, the power line communication device 710 sends a message to the four EV chargers 721-724 with charging vehicles. The four charging vehicles are equipped with 25A respectively. In other words, the message instructs the EV chargers 721-722 to reduce their current consumption from 50A to 25A, and instructs the EV chargers 723-724 to increase their current from 0A to 25A. Fig. 9is an example diagram showing a dynamic load balancing method with power line communication when there are three charging vehicles according to various embodiments. When the car is fully charged, the associated EV charger 723 notifies the power line communication device 710. Then, the power line communication device 710 sends a message to the three EV chargers 721, 722, and 724 with the charging vehicles, provided that 33A will be dynamically allocated to the remaining three charging vehicles. In other words, the message instructs the EV chargers 721, 722, and 724 to increase their current consumption from 25A to 33A. In these examples, the distribution of power is based on the principle of uniform distribution. In various embodiments, it can be based on the first-in-first-charge principle, a phase-aware algorithm, or any algorithm. The advantage of this local dynamic load balancing of power line communication for electric vehicle charging is that it reduces installation time and cost. It also distributes available power to charging cars in real time without connecting to the cloud. In an alternative embodiment, one of the EV chargers is designated as the power manager and the power line communication device only provides the maximum current of the power line and the real-time total current flowing to the EV charger or EV charger acting as the power manager. The electric vehicle charger may include a processor, controller, or computer system such as Figure 1 The computer system shown. System for transmitting real-time current available to electric vehicle chargers Back to Figure 7 , a system for transmitting real-time current available to electric vehicle chargers is shown. The system includes a power line communication device 710. The power line communication device 710 measures the total current flowing through one or more power lines that provide power to m EV chargers 721-725. The power line communication device 710 establishes communication with one or more of the m EV chargers 721-725 using the one or more power lines 730 as a communication medium. In various embodiments, the power line communication device 710 also includes a preset maximum current for the one or more power lines 730. In various embodiments, the power line communication device 710 also provides dynamic load balancing. For example, the power line communication device 710 establishes communication with at least each of the n chargers 721-722 in the m EV chargers 721-725, where n≤m. In other words, the n chargers 721-722 tell the power line communication device 710 that they have cars to charge. The power line communication device 710 calculates the current of each of the n chargers based on the total current, the preset maximum current, or the total current and the preset maximum current. Finally, the power line communication device 710 transmits the calculated current to each of the n chargers 721-722. In various embodiments, the power line communication device 710 calculates the current of each of the n chargers 721 - 722 based on a first-in, first-out principle. In various embodiments, the power line communication device 710 calculates the current of each of the n chargers 721 - 722 based on a phase awareness algorithm. In various embodiments, the power line communication device 710 calculates the current of each of the n chargers 721 - 722 by evenly distributing the total current among the n chargers 721 - 722 . In various embodiments, the power management electric vehicle charger provides dynamic load balancing. For example, the power management EV charger is EV charger 721 among m EV chargers 721-725. The power line communication device 710 transmits the total current, the preset maximum current, or both the total current and the preset maximum current to the power management EV charger 721. The power management EV charger 721 uses one or more power lines 730 as a communication medium to establish communication with at least each of n chargers 722 among m-1 chargers 722-725, where n≤m-1. The power management EV charger 721 also receives power requests from n chargers 722. The power management EV charger 721 calculates the current of each of the n chargers 722 and the power management EV charging device 721 based on the total current, the preset maximum current, or both the total current and the preset maximum current. In this case, since both EV chargers 721 and 722 have cars requesting charging, the currents of the two chargers are calculated. The power management EV charger 721 transmits the calculated current to each of the n chargers 722. In this case, power-managing EV charger 721 calculates the current for itself, but does not need to communicate over power line(s) 730 . Similarly, as described above, in various embodiments, the power management EV charger 721 is based on a first input, a second input, and a third output, a first charging principle. In various embodiments, the power-managed EV charger 721 calculates the current of each of the n chargers 722 and the power-managed EV charging device 721 based on a phase-aware algorithm. In various embodiments, power-managed EV charger 721 calculates the current for each of n chargers 722 and power-managed EV charging device 721 by evenly distributing the total current among n chargers 721 - 722 . Method for communicating real-time current available from electric vehicle charger Fig.10 A flow chart of a method 1000 for communicating real-time current available to an electric vehicle charger is shown, according to various embodiments. In step 1010 of method 1000 , a total current flowing through one or more power lines that supply power to m EV chargers is measured using a power line communication device. In step 1020 , a power line communication device is used to establish communication with one or more of the m EV chargers using one or more power lines as a communication medium. Computer program product for transmitting real-time available current In various embodiments, a computer program product includes a non-transitory tangible computer readable storage medium, the contents of which include a program with instructions executed on a processor to perform a method for delivering real-time current available to an EV charger. The processor may be, but is not limited to, a controller, a computer, a microprocessor, Figure 1 The method is performed by a computer system or any device capable of providing control signals and analyzing data. The method is performed by a system including one or more different software modules. Fig.11 1 is a schematic diagram of a system 1100 according to various embodiments, the system 1100 including one or more different software modules and executing a method for transmitting real-time current available to an electric vehicle charger. The system 1100 includes a measurement module 1110 and a communication module 1120 . The measurement module 1110 measures the total current flowing through one or more power lines that supply power to the m electric vehicle chargers. The communication module 1120 establishes communication with one or more of the m EV chargers using the one or more power lines as a communication medium. Although the present teaching is described in conjunction with various embodiments, it is not intended that the present teaching is limited to these embodiments. On the contrary, those skilled in the art will appreciate that the present teaching includes various alternatives, modifications and equivalents. In addition, when describing various embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, in the case where the method or process does not rely on the specific sequence of steps described herein, the method or method should not be limited to the specific sequence of steps described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, the claims for the method and / or process should not be limited to performing its steps in the order written, and those skilled in the art can easily understand that the sequence can be changed and still remain within the spirit and scope of the various embodiments. The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A system for transmitting real-time current available to an electric vehicle charger, characterized in that include: A power line communication device is used to: measure the total current flowing through one or more power lines that supply power to m electric vehicle chargers, and establish communication with one or more of the m EV chargers using the one or more power lines as a communication medium.

2. The system according to claim 1, characterized in that The power line communication device also includes a preset maximum current for the one or more power lines.

3. The system according to claim 2, characterized in that The power line communication device establishes communication with each of n chargers among the m EV chargers, The power line communication device also receives a power request from the charger, The power line communication device calculates the current of each of the n chargers based on the total current, the preset maximum current, or both the total current and the preset maximum current, and The power line communication device transmits the calculated current to each charger in the n nodes.

4. The system according to claim 3, characterized in that The power line communication device calculates the current of each of the n chargers based on the first-in-first-out principle; or the power line communication device calculates the current of each of the n chargers based on a phase sensing algorithm; Or the power line communication device calculates the current of each of the n chargers by evenly distributing the total current among the n chargers.

5. The system according to claim 2, characterized in that Also included is a power management EV charger, wherein the power management EV charging device is one of the m EV chargers, The power line communication device transmits the total current, the preset maximum current, or both the total current and the preset maximum current to the power management EV charger, The power management EV charger uses one or more power lines as the communication medium to establish communication with each of the n chargers of m-1 chargers, where n≤m-1, The power-managed EV charger also receives power requests from the n chargers, the power-managed EV charging device calculates a current for each of the n chargers from the total current, the preset maximum current, or the total current and the preset maximum current, and the power-managed EV charger transmits the calculated current to each of the n EV chargers.

6. The system according to claim 5, characterized in that The power management EV charger calculates the current of each of the n chargers based on a first-in-first-out principle; or the power management EV charger calculates the current of each of the n chargers based on a phase sensing algorithm; Alternatively, the power management EV charger calculates the current of each of the n chargers by evenly distributing the total current among the n chargers.

7. A method for transmitting real-time current available to an electric vehicle charger, characterized in that include: measuring a total current flowing through one or more power lines that provide power to m electric vehicle chargers using a power line communication device, and establishing communications with one or more of the m EV chargers using the one or more power lines as a communications medium using the power line communication device.

8. The method according to claim 7, characterized in that The power line communication device establishes communication with each of n chargers among the m EV chargers, the power line communication device also receives a power request from the n chargers, the power line communication device calculates a current of each of the n chargers based on a total current, a preset maximum current, or both the total current and the preset maximum current, and the power line communication device transmits the calculated current to each charger among the n nodes.

9. The method according to claim 8, characterized in that The power line communication device calculates the current of each of the n chargers based on the first-in-first-out principle; or the power line communication device calculates the current of each of the n chargers based on a phase sensing algorithm; Or the power line communication device calculates the current of each of the n chargers by evenly distributing the total current among the n chargers.

10. The method according to claim 7, characterized in that The m EV chargers include a power management EV charger, the power line communication device transmits the total current, the preset maximum current, or both the total current and the preset maximum current to the power management EV charger, and the power management EV charger establishes communication with each of the n chargers of the m-1 EV chargers using one or more power lines as a communication medium, where n≤m-1; The power-managed EV charger also receives power requests from the n chargers, the power-managed EV charging device calculates a current for each of the n chargers from the total current, the preset maximum current, or the total current and the preset maximum current, and the power-managed EV charger transmits the calculated current to each of the n EV chargers.

11. The method according to claim 10, characterized in that The power management EV charger calculates the current of each of the n chargers based on a first-in-first-out principle; or the power management EV charger calculates the current of each of the n chargers based on a phase sensing algorithm; Alternatively, the power management EV charger calculates the current of each of the n chargers by evenly distributing the total current among the n chargers.

12. A computer program product comprising a non-transitory tangible computer readable storage medium, the contents of which cause a processor to execute a method for delivering real-time current available to an electric vehicle charger, characterized in that include: A system is provided, wherein the system includes one or more different software modules, and wherein the different software modules include a measurement module and a communication module; measuring a total current flowing through one or more power lines that provide power to m electric vehicle chargers using the measurement module; and using the communication module, establishing communication with one or more of the m EV chargers using the one or more power lines as a communication medium.

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