KR20230065488A - Variable power slow charger for electric vehicle - Google Patents

Abstract

The present invention relates to a variable power control-type charging system for one or more buildings, which can comprise: a power controller connected to a switchboard of the one or more buildings to be able to transmit and receive power and data, and capable of variably controlling one or more of a charging power, charging current, charging voltage, charging speed, and number of connection dispensers based on the preset total charging capacity for an EVSE in the switchboard; and a plurality of variable power chargers parallelly connected to the power controller with n units for one power controller, and transmitting the charging power received from the power controller to the electric vehicle. As such, no separate complex additional facility design or excessive facility installation spaces are required, and the number of simultaneously chargeable electric vehicles can be economically and efficiently increased despite the preset switchboard capacity and/or the limits in the total available charging capacity of the charging system of the buildings.

Description

Variable power slow charger for electric vehicles {VARIABLE POWER SLOW CHARGER FOR ELECTRIC VEHICLE}

The present invention relates to an electric vehicle charging system capable of efficiently utilizing limited charging capacity, and more particularly, in a building such as an apartment complex, the charging output of an electric vehicle charger according to the limited charging capacity compared to the power receiving capacity previously set at the time of construction. and a variable power control type charging system capable of flexibly controlling and distributing a charging speed.

The present invention is carried out from April 1, 2021 to December 31, 2022 of the Korea Institute for Advancement of Technology's "Regional Specialized Industry Fostering + (R&D)-Regional Key Industry Fostering" project, "OCPP2.0 using automatic license plate recognition" Charging system development" task (institutional specific task number: S3093197) is an invention produced as a result of research.

In order to solve the climate change crisis caused by greenhouse gases, which has emerged as a continuous problem worldwide, countries around the world have invested heavily in new and renewable energy development and energy saving policies. In particular, Jeju Special Self-Governing Province also contributed greatly to the supply of new and renewable energy generation facilities and the increase in power generation, resulting in a significant increase in the capacity of new and renewable energy facilities, among which the proportion of solar and wind power generation facilities increased very significantly.

The capacity of such new and renewable energy power generation facilities has a serious problem of occurrence of surplus power or power shortage by time of day according to the increase and decrease of wind and sunlight / heat, which are basic power sources. Technology to install an electric vehicle charging system in the parking lot of an existing building or a newly built building so that electric vehicles can be charged during times of high surplus power and discharged during times of power shortage to recover power. development is expanding.

However, in the case of installing an electric vehicle charging system in an existing building, not only is the capacity of receiving power from the commercial system pre-determined at the time of obtaining a building permit, but also the total charging capacity available in the parking lot is pre-determined. Later, it was recognized that it is difficult to change this and that the number of vehicles that can be charged at the same time is very limited when an electric vehicle charging system is installed in an existing building.

In this regard, Korean Patent Registration No. 1663086 discloses a grid-type energy network facility consisting of row conductors, column conductors, and a bi-directional switch in the charger so that multiple electric vehicles can be charged using fewer chargers than electric vehicles. Although it is possible to simultaneously charge more electric vehicles than the number of chargers by connecting them, the design is complicated and the installation space and cost increase rapidly because the energy network facilities must be separately composed of row conductors, column conductors, and multiple bi-directional switches. There is a problem with

(Patent Document) Republic of Korea Patent Registration No. 1663086

It has been made to solve the above problems, and the technical problem to be achieved by the present invention is a preset power receiving capacity and / or charging system of a built building without requiring a separate complicated additional facility design or excessive facility installation space. An object of the present invention is to provide a variable power control type charging system capable of economically and efficiently increasing the number of electric vehicles that can be simultaneously charged despite the limitation of the total usable charging capacity.

Another technical problem of the present invention is to charge efficiently by freely and variably controlling the charging power, charging speed, and number of electric vehicles to be charged according to the time zone or the number of electric vehicles to be charged simultaneously within the preset receiving capacity or total charging capacity of the building. It is to provide a variable power control type charging system capable of this.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, a variable power-controlled charging system for one or more buildings according to an embodiment of the present invention is connected to a switchboard of the one or more buildings to transmit and receive power and data, and is preset in the switchboard. A power controller capable of variably adjusting at least one of charging power, charging current, charging voltage, charging speed, and the number of connected chargers based on the total charging capacity for the EVSE; and a plurality of variable power chargers connected to the power controller in parallel in a 1:n manner and transmitting charging power received from the power controller to the electric vehicle.

According to an embodiment of the present invention, the variable power-controlled charging system is a power-controlled charging system, and the plurality of variable power chargers transmit the charging power received from the power controller to the electric vehicle or transmit the charging power received from the electric vehicle to the electric vehicle. It can be a bi-directional variable power charger that transmits to the power controller.

According to one embodiment of the present invention, the plurality of variable power chargers may be slow chargers.

According to one embodiment of the present invention, a monitoring server communicatively connected to the power controller and controllably configured to readjust the maximum charging output and charging speed of the power controller according to the power receiving capacity preset for the one or more buildings. may further include.

According to an embodiment of the present invention, the power controller may control to differently supply at least one of the charging power and charging speed to each of the plurality of variable power chargers.

According to one embodiment of the present invention, the variable power control type charging system may add one or more chargers and connect them to the power controller, and charge the preset EVSE total of the power controller through the one or more additional chargers. It may be configured to enable charging within capacity.

According to one embodiment of the present invention, the power controller variably adjusts at least one or more of charging power, charging voltage, charging current, charging speed, and the number of connected chargers based on the total charging capacity for EVSE set in the switchboard. and an EVSE (Electronic Vehicle Supply Equipment) main control module that controls charging power by generating variable information for distribution, wherein each variable power charger communicates with the EVSE main PCB and is controlled by the EVSE main PCB. It may include an ESVE sub control module that controls to receive the variable redistributed charging power received from the power controller and supply it to the electric vehicle.

According to one embodiment of the present invention, the power controller may include a power conversion module for converting power transmitted and received from the switchboard; and receiving or transmitting power with the power conversion module, and being connected to the EVSE main control module, the charging power, charging voltage, charging current, charging speed of power transmitted and received from the power conversion module according to the variable information, and a power management module variably adjusting or distributing at least one of the number of connected chargers.

According to one embodiment of the present invention, the monitoring server is communicatively connected to the power controller, monitors the state of power and total charging capacity of the power controller, and performs the monitoring according to the preset power receiving capacity of the one or more buildings. A charging monitoring module that controls to readjust the maximum charging output and charging speed of the power controller; and a billing module for calculating a billed fee according to the bi-directional charging information received from the bi-directional charging monitoring module.

According to an embodiment of the present invention, each of the variable power chargers is communicatively connected to a power controller to transmit and receive variable information for variably adjusting or distributing at least one of charging power, charging voltage, charging current, and charging speed, and an EVSE sub control module generating a control signal for variably adjusting charging of the charger according to the variable information; an inverter converting power received from the power controller according to the signal of the EVSE sub-PCB; and a connector for transmitting the converted power to the electric vehicle, and is connected to a power controller for one or more buildings in a 1:n manner to transmit charging power to the electric vehicle.

According to an embodiment of the present invention, each of the variable power chargers is a bidirectional variable power charger capable of transmitting charging power to the electric vehicle or receiving discharged power from the electric vehicle and further transmitting the power to the power controller, and the inverter comprises A bidirectional inverter capable of bidirectionally converting power transmitted or received from the power controller according to the signal of the EVSE sub-PCB, and the connector may be a bidirectional connector that transmits charging power to the electric vehicle or receives discharging power from the electric vehicle. there is.

According to one embodiment of the present invention, the variable power charger may be a slow charger.

According to an embodiment of the present invention, a power regulating module for receiving the signal from the EVSE sub control module and adjusting power for charging and discharging power is further included, and the inverter controls the power regulating It can be controlled by an adjustment signal generated by the module.

According to an embodiment of the present invention, a battery management module may further include a battery management module for monitoring and displaying a state of variable power received from the power controller on a display.

According to one embodiment of the present invention, a separate and complex additional facility design, excessive facilities, and installation space are not required, and at a low cost, the preset power receiving capacity of the built building and / or the total charging capacity available for the charging system Despite the limitations, it shows the effect of economically and efficiently increasing the number of electric vehicles that can be charged simultaneously.

In addition, according to an embodiment of the present invention, the charging power, charging speed, and number of charging electric vehicles are freely and variably controlled according to the time zone or the number of electric vehicles to be charged simultaneously within the total charging capacity preset at the time of building construction permit. It shows the effect that can be charged efficiently.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 shows a schematic diagram of an electric vehicle charging system installed in a parking lot of an apartment complex according to the prior art.
2 shows a schematic diagram of a variable power control type charging system according to an embodiment of the present invention.
3 shows a schematic diagram of a variable power-controlled charging system that can be connected to a commercial power system according to another embodiment of the present invention.
4 shows a schematic diagram of a variable power control type AC charging system installed in a parking lot of an apartment complex according to an embodiment of the present invention.
Figure 5 shows an example of power distribution at the time of 7kW variable power control type AC slow charging system according to an embodiment of the present invention.
6 illustrates an example of power distribution at a variable 3kW of the variable power-controlled AC slow charging system according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In this specification, the term "bidirectional charging" refers to a commercial power system or one or more buildings that can both charge the electric power received from the electric vehicle and discharge the electric vehicle and recover the received power to the one or more buildings or commercial power grids. means that

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a schematic diagram of an electric vehicle charging system installed in a parking lot of an apartment complex according to the prior art. Referring to FIG. 1, in the related art, power is received from a commercial power system in a power distribution board of an apartment complex, and through a switchboard of the apartment complex, it is possible to install within the range of the total charging capacity preset at the time of building permission for the apartment complex. An electric vehicle charger (eg dispenser) can be installed. In the case of FIG. 1 , when a plurality of 7kW slow chargers are installed within a preset total charging capacity, the maximum number of electric vehicles that can be charged at the same time becomes three, and further expansion of electric vehicle chargers is impossible. Therefore, there arises a problem that the charging facility cannot handle the increasing speed of the number of electric vehicles in the multi-unit dwelling.

To solve this problem, FIG. 2 shows a schematic diagram of a variable power control type charging system 200 according to an embodiment of the present invention.

Referring to FIG. 2 , a variable power-controlled charging system 200 according to an embodiment of the present invention may include a power controller 220 and one or more chargers 230 . The variable power-controlled charging system 200 for one or more buildings according to an embodiment of the present invention may further include a monitoring server 240 communicating with the power controller 220 . The variable power-controlled charging system is configured to charge the electric power received from the commercial power system through the one or more buildings into an electric vehicle or discharge the electric power from the electric vehicle to recover power back to the one or more buildings or commercial power systems. may be a system.

Specifically, the power controller 220 is connected to transmit/receive power and data to the one or more buildings (eg, buildings, apartment complexes, complex facilities, etc.) or the switchboard 210, and to the switchboard. At least one of charging power, charging current, charging voltage, charging speed, and the number of connected chargers may be variably adjusted based on a preset total charging capacity for EVSE. The variable adjustment may be implemented by software, hardware, or software/hardware included in the power controller 220, and variable adjustment may be performed in one direction or in both directions. The power controller 220 may control to differently supply at least one of the charging power, charging voltage, charging current, and charging speed to each of the plurality of variable power chargers.

According to an embodiment of the present invention, the power controller 220 performs at least one of charging power, charging voltage, charging current, charging speed, and the number of connected chargers based on the total EVSE charging capacity set in the switchboard 210. an EVSE (Electronic Vehicle Supply Equipment) main control module 222 that controls charging power by generating variable information for variably adjusting or distributing the abnormality; a power conversion module (PCS, 224) for converting power transmitted and received from the switchboard 210; And the charging power of power that receives or transmits power with the power conversion module 224 and is connected to the EVSE main control module 222 and transmitted and received from the power conversion module 224 according to the variable information; A power management module (PMS) 226 variably adjusts or distributes at least one of charging voltage, charging current, charging speed, and the number of connected chargers.

The plurality of variable power chargers 230 may be connected in parallel to the power controller in a 1:n manner and transmit charging power received from the power controller 220 to the electric vehicle. The plurality of variable power chargers 230 may be variable power chargers that transmit charging power received from the power controller to the electric vehicle or transmit charging power received from the electric vehicle to the power controller. According to an embodiment of the present invention, the plurality of variable power chargers may be slow chargers. In another embodiment of the present invention, each of the plurality of variable power chargers may include a separate energy storage device (ESS).

The monitoring server 240 is communicatively connected to the power controller 220 and controls to readjust the maximum charging output and charging speed of the power controller 220 according to the power receiving capacity preset for the one or more buildings. can be made possible. The monitoring server 240 may be installed inside or outside the one or more buildings. In one embodiment of the present invention, one monitoring server 240 may be connected to a plurality of power controllers 220 . The monitoring server 240 may be configured to simultaneously monitor a plurality of chargers when implementing a large-scale charging system in the future, and to enable collective control for the progress of a business model for simultaneous charging/discharging. The monitoring server 240 may receive and display charger status and charge/discharge information from the plurality of variable power chargers 230 . The monitoring server 240 may be configured to implement system monitoring and charge/discharge control operations by linking a conventional vehicle-to-grid (V2G) charger monitoring server with a variable power-controlled charging system according to an embodiment of the present invention. there is.

The monitoring server may communicate a charging operation command signal to the power controller 220 through RS-232, for example. In addition, the power controller 220 may transmit a control signal to the plurality of variable power chargers 230 through, for example, CAN, mobile communication, or Wi-Fi.

3 shows a schematic diagram of a variable power-controlled charging system that can be connected to a commercial power system according to another embodiment of the present invention. Referring to FIG. 3 , the variable power-controlled charging system 300 may include a power controller 320, a variable power charger 330, and a monitoring server 340.

Specifically, the power controller 320 is connected to the KEPCO system, which is a commercial power system, and received through a switchboard and / or switchboard (eg, AC 3-phase circuit breaker) in an apartment house or facility that receives a certain power reception capacity. Power may be received by the power conversion module (PCS) 324 to mutually convert the power between AC (alternating current) and DC (direct current). In another embodiment of the present invention, the power conversion module (PCS, 324) may additionally convert a power level or method between AC-AC or DC-DC. The converted power is variably adjusted with respect to at least one or more of charging power, charging voltage, charging current, charging speed, and the number of chargers to which power is to be distributed by the power management module (PMS, 326), such variable adjustment and/or Redistribution is performed in the power management module 326 according to the control signal generated by the EVSE main control module 322. The EVSE main control module may be an EVSE main printed circuit board (PCB).

The variable power charger 330 receives the variablely adjusted and/or redistributed power, and includes a battery management system (BMS) 331 that detects and manages a state of the power, and the EVSE main control module ( 322) to transmit/receive information related to variable adjustment and/or redistribution and to generate a control signal accordingly, which performs power regulation according to the control signal of the EVSE sub-control module 332. A power regulating module 333, a bi-directional inverter 334 that converts the power received from the power management module 326, and/or supplies charging power to the electric vehicle 350 or the electric vehicle 350 It may include a bi-directional connector 335 for recovering discharged power from. The variable power charger 330 may display information such as a received power state detected by the BMS on a display or as an indicator. The user of the variable power charger 330 may drive the variable power charger 330 by pressing a button 336 or providing user information to the RFID/NFC recognition module 337 using a credit card or the like. The power regulating module may be a switching mode power supply (SMPS). The power regulating module 333 and/or the bidirectional connector 335 may further include a noise filter.

The monitoring server 340 is communicatively connected to the power controller 320, monitors power variable adjustment and redistribution of the power controller 320, and adjusts the maximum power of the power controller 320 according to the power receiving capacity preset in the corresponding facility. It may include a charging monitoring module 342 that controls to readjust the charging output and charging speed, and a charging module 344 that calculates charging information to the user based on the charging monitoring. The monitoring server 340 may be installed outside the facility, and one monitoring server 240 may be connected to each of the power controllers 320 installed in a plurality of facilities to manage variable power control and billing accordingly. there is.

According to an embodiment of the present invention, the monitoring server 340 may perform the following operations when monitoring the power controller 220 .

(1) Transmit charger information after moving to standby screen

(2) Select usage type (general charging user/V2G service user)

(3) User authentication (for example, authentication according to the card number registered in the Energy Management System (EMS))

(4) Service operation specified by EMS (charge/standby/discharge/charge)

(5) EMS continuously checks for emergency stop

(6) EMS transmission of information during charging

(7) Transmission of charging completion information

4 shows a schematic diagram of a variable power control type AC charging system installed in a parking lot of an apartment complex according to an embodiment of the present invention. Referring to FIG. 4, the apartment complex receives a preset power reception capacity from the commercial power system during construction, and can be connected to the variable power control type charging system according to an embodiment of the present invention to the switchboard of the apartment complex. The variable power-controlled charging system may include a power controller and a plurality of variable power chargers, and may further include a monitoring server installed inside or outside a facility and communicatively connected thereto. In the embodiment of FIG. 4 , AC slow chargers are used for the plurality of variable power chargers.

The power controller may variably adjust or distribute at least one of charging power, charging current, charging voltage, charging speed, and the number of connected chargers based on the total EVSE charging capacity preset in the switchboard. The power controller may control to differently supply at least one of the charging power, charging voltage, charging current, and charging speed to each of the plurality of variable power chargers.

According to an embodiment of the present invention, when the charging output of the slow charger is configured as AC and distributed within a preset total chargeable power capacity, the output of each charger can be variably adjusted in the range of about 3kW to 7kW. When the power control type charging system is installed in the parking lot of the apartment complex or facility, the variable power control type charging system is variably adjusted to 3 kW to charge up to 15 electric vehicles, and considering the efficiency of the charger, actually charges about 14 electric vehicles at the same time. This becomes possible, and at the same time, it is possible to efficiently secure a parking area capable of charging at least 6 to 14 electric vehicles. Therefore, the power controller can control the electric power amount of the electric vehicle charger according to the capacity (or total chargeable capacity) in the apartment complex or facility, and the number of electric vehicles that can be charged at the same time even if only a slow charger is added to the parking lot and connected to the power controller has a structure that allows it to be extended.

5 shows an example of power distribution at 7 kW of variable power control charging system according to an embodiment of the present invention, and FIG. 6 shows an example of power distribution at 3 kW of variable power control charging system according to an embodiment of the present invention. An example of power distribution is shown.

When the permitted power receiving capacity of an apartment complex or facility is predetermined at 45 kW and an AC slow charger variable in the range of about 3 kW to 7 kW is used in the variable power control charging system according to an embodiment of the present invention, in FIG. 5, power The controller and multiple variable power chargers are set to charge and distribute variable power at 7 kW for individual charging, showing that in such a case, about six electric vehicles can be charged simultaneously.

In addition, FIG. 6 shows that a power controller and a plurality of variable power chargers are set to charge and distribute variable power for individual charging at 3 kW, and in this case, about 15 electric vehicles can be charged simultaneously.

According to this configuration, the variable power control charging system may additionally install one or more chargers in a parking lot and connect them to the power controller. It may be configured to enable charging within the charging capacity.

Therefore, the charger utilization is improved by efficiently utilizing the limited charging capacity due to the preset power reception capacity of the apartment house or facility. It is facilitated to protect, for example, to limit usage due to the transformer capacity or to prevent accidents from occurring due to load capacity exceeding the transformer capacity. In addition, chargers can be manufactured in various shapes (wall type, rail type, etc.), and even when additional chargers are installed, they can be installed in the parking lot without the need for underground construction for separate cable burial, reducing the size of the construction and reducing the amount required. this may be reduced.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

200, 300: variable power control charging system
210: switchboard or facility
220, 320: power controller
222, 322: EVSE main control module
224, 324: power conversion module (PCS)
226, 326: power management module (PMS)
230, 330: variable power charger
232, 332: EVSE sub control module
234 Inverter
236: connector
240, 340: monitoring server
250, 350: electric car
331: BMS (Battery Management System) module
333: power regulating module
334: bidirectional inverter
335 bi-directional connector
336: button
337: RFID/NFC recognition module
342: charging monitoring module
344: billing module

Claims (14)

As a variable power-controlled charging system for one or more buildings,
At least one or more of charging power, charging current, charging voltage, charging speed, and the number of connected chargers connected to the switchboard of the one or more buildings to be able to transmit and receive power and data, and based on the total charging capacity for EVSE preset in the switchboard A power controller capable of variably adjusting or distributing; and
A variable power-controlled charging system comprising a plurality of variable power chargers connected in parallel to the power controller in a 1:n manner and transmitting charging power received from the power controller to the electric vehicle. According to claim 1,
The variable power-controlled charging system is a power-controlled charging system,
Characterized in that the plurality of variable power chargers are bidirectional variable power chargers that transmit the charging power received from the power controller to the electric vehicle or transmit the charging power received from the electric vehicle to the power controller. According to claim 1,
The variable power control type charging system, characterized in that the plurality of variable power chargers are slow chargers. According to claim 1,
Further comprising a monitoring server communicatively connected to the power controller and controllably configured to readjust the maximum charging output and charging speed of the power controller according to the power receiving capacity preset for the one or more buildings. Characterized in that, Variable power control charging system. According to claim 1,
The variable power-controlled charging system, characterized in that the power controller controls to differently supply at least one of the charging power and charging speed to each of the plurality of variable power chargers. According to claim 1,
The variable power control charging system can connect one or more additional chargers to the power controller, and charge within the preset EVSE total charging capacity of the power controller through the one or more additional chargers. Characterized in that, a variable power control type charging system. According to claim 1,
The power controller generates variable information for variably adjusting or distributing at least one of charging power, charging voltage, charging current, charging speed, and the number of connected chargers based on the total charging capacity for EVSE set in the switchboard. Including an EVSE (Electronic Vehicle Supply Equipment) main control module that controls charging power;
Each of the chargers includes an ESVE sub control module that communicates with the EVSE main PCB and controls to receive variable redistributed charging power received from the power controller controlled by the EVSE main PCB and supply it to the electric vehicle. Characterized in that, a variable power control type charging system. The method of claim 7, wherein the power controller,
a power conversion module that converts power transmitted and received from the switchboard; and
Receives or transmits power with the power conversion module, and is connected to the EVSE main control module to determine the charging power, charging voltage, charging current, charging speed, and A variable power control type charging system further comprising a power management module for variably adjusting or distributing at least one of the connected chargers. The method of claim 4, wherein the monitoring server,
Controlled to be communicatively connected to the power controller to monitor the power and total charging capacity status of the power controller, and readjust the maximum charging output and charging rate of the power controller according to the preset power receiving capacity for the one or more buildings charge monitoring module; and
A variable power-controlled charging system, characterized in that it comprises a billing module for calculating a charge to be charged according to the bi-directional charging information received from the bi-directional charging monitoring module. It is communicatively connected to the power controller to transmit and receive variable information for variably adjusting or distributing at least one of the charging power, charging voltage, charging current, and charging speed, and variably controlling the charging of the charger according to the variable information. EVSE sub-control module generating a signal;
an inverter converting power received from the power controller according to the signal of the EVSE sub-PCB; and
A connector for transmitting the converted power to the electric vehicle;
The variable power charger is connected to a power controller for one or more buildings in a 1:n manner to transmit charging power to an electric vehicle. According to claim 10,
The variable power charger. A bidirectional variable power charger capable of transmitting charging power to the electric vehicle or receiving discharged power from the electric vehicle and further transmitting it to the power controller;
The inverter is a bidirectional inverter capable of converting power transmitted or received from the power controller in both directions according to the signal of the EVSE sub-PCB,
The variable power charger, characterized in that the connector is a bidirectional connector for transmitting charging power to the electric vehicle or receiving discharging power from the electric vehicle. According to claim 10,
The variable power charger is characterized in that the slow charger. According to claim 10,
Further comprising a power regulating module receiving the signal from the EVSE sub control module and adjusting charging/discharging power;
The variable power charger, characterized in that the inverter is controlled by an adjustment signal generated by the power regulating module. According to claim 10,
The variable power charger further comprises a battery management module for monitoring and displaying a state of the variable power received from the power controller on a display.

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