Electric vehicle charging control device, vehicle-to-vehicle charging system, and method

Abstract

The present invention provides an electric vehicle charging control device and an electric vehicle charging system that effectively control charging during vehicle-to-vehicle charging and optimize charging control for vehicle-to-vehicle charging methods. [Solution] The electric vehicle charging control device includes a power input unit that supplies an input voltage, a charging control signal generation unit 500 that generates a charging control signal based on the input voltage supplied from the power input unit, and a charging control unit that determines the characteristics of the charging control signal generated by the charging control signal generation unit. The charging control signal generation unit includes a plurality of voltage conversion units 550, 530, and each of the plurality of voltage conversion units converts voltage using a different voltage conversion method. According to the electric vehicle charging control device of the present invention, it is possible to control charging between electric vehicles and improve the efficiency of signal generation for controlling charging between electric vehicles.

Description

Technical Field

[0001] The present invention relates to vehicle-to-vehicle battery charging, and more particularly to an apparatus for controlling inter-vehicle charging of electric vehicles based on a charging control signal. The present invention also relates to inter-vehicle charging control and power transmission for electric vehicle batteries.

Background Art

[0002] Electric Vehicles (EVs) have been spreading worldwide as an environmentally friendly means of transportation, and along with this trend, technologies for charging batteries of electric vehicles have also been developed. In general, battery charging for electric vehicles is performed at fixed charging stations, which are operated by applying various charging standards and communication protocols such as SAE 2847 / 2, SAE J1772, ISO 15118, Combined Charging System (CCS), Tesla Supercharger, etc., for stable power transmission with electric vehicles.

[0003] Among charging standards, SAE J1772 and ISO 15118 utilize PWM (Pulse Width Modulation) signals as charging control signals for the Electric Vehicle Communication Controller (EVCC) to monitor and control the charging status. The method of determining the charger status and available charging current using PWM signals is generally used in fixed charging infrastructure and enables stable charging management.

[0004] However, in recent years, there has been an increasing need for V2V (Vehicle-to-Vehicle) charging that shares battery power between vehicles. The V2V charging method directly shares electric power between vehicles in environments where charging infrastructure is insufficient, so it can be effectively utilized even in situations where emergency charging is required.

[0005] Conventional PWM signal generation circuits were designed for use in high-voltage, high-power environments such as charging stations. Therefore, a new PWM signal generation and control method suitable for V2V charging is needed, and technological improvements are required to enable more efficient and stable charging through this method.

[0006] Supported by advancements in battery technology, electrical and electronic technology, and communication technology, the performance, efficiency, and user convenience of electric vehicles have greatly improved. Combined with efforts to address environmental issues and conserve energy, the adoption of electric vehicles is steadily increasing. The improvement in the energy density of lithium-ion batteries has increased battery capacity, resulting in a significant increase in the driving range of electric vehicles.

[0007] In addition, research is progressing on charging high-voltage batteries for electric vehicles. International standards for communication between electric vehicle battery charging stations and in-vehicle charging control devices related to wired charging, such as CCS, Tesla, and NACS, are also being actively established.

[0008] Research is actively progressing on methods for receiving power from charging stations to charge electric vehicle batteries, and research is also actively progressing on charging methods that allow electric vehicles to share battery power with each other.

[0009] Since electric vehicle batteries employ a high-voltage charging system, power-related safety management is essential and a critical issue. Furthermore, in battery charging between electric vehicles, there are requirements for efficient power transmission and safety management in relation to power transfer.

[0010] Furthermore, in systems that transmit power to charge high-voltage batteries between electric vehicles, there is a need for development of systems that control the charging of electric vehicles and transmit power according to the charging type or charging mode. [Prior art documents] [Patent Documents]

[0011] Patent Document 1: Korean Published Patent Publication No. 10-2021-0097950 (2021.08.10) Patent Document 2: Korean Patent Registration Publication No. 2722310 (October 22, 2024) [Overview of the project] [Problems that the invention aims to solve]

[0012] This invention aims to effectively control charging during vehicle-to-vehicle charging. Furthermore, this invention aims to provide a device that can control charging optimized for vehicle-to-vehicle charging systems.

[0013] The present invention aims to transmit power for effective charging during vehicle-to-vehicle charging. Furthermore, the present invention aims to provide a system and method that can provide power supply and charging control functions while improving the stability of charging mode switching in accordance with the control of the vehicle's power supply mode and power charging mode. [Means for solving the problem]

[0014] The electric vehicle charging control device according to the present invention includes a power input unit configured to supply an input voltage, a charging control signal generation unit that generates a charging control signal based on the input voltage supplied from the power input unit, and a charging control unit that determines the characteristics of the charging control signal generated by the charging control signal generation unit, wherein the charging control signal generation unit includes a plurality of voltage conversion units, and each of the plurality of voltage conversion units can convert voltage using a voltage conversion method different from that of the others.

[0015] Furthermore, the charging control signal generation unit may further include a PWM signal generator that generates the charging control signal using the converted voltages output from the plurality of voltage conversion units as input.

[0016] Furthermore, the input voltage may be 15V, and the conversion voltage may be +12V and -12V.

[0017] Further, the charging control signal may be a PWM (Pulse Width Modulation) signal.

[0018] Further, the plurality of voltage conversion units may include a positive voltage conversion unit that converts the input voltage into a positive voltage, and a negative voltage conversion unit that converts the input voltage into a negative voltage.

[0019] Further, the positive voltage conversion unit may include a linear regulator circuit.

[0020] Further, the linear regulator circuit may include an internal resistance and a load.

[0021] Further, the negative voltage conversion unit may include a DC-DC converter circuit.

[0022] Further, the DC-DC converter circuit may include at least one of a switching element, a diode, an inductor, and a capacitor.

[0023] Further, the electric vehicle charging control device may further include an output resistance connected to the charging control signal unit and an external vehicle.

[0024] Further, the charging control signal may be a signal that controls charging according to at least one of CHAdeMO, CCS, NACS and GB / T standards.

[0025] Further, the electric vehicle charging control device may further include an inlet, and the inlet may include a CP port for transmitting and receiving charging control signals and a power port for transmitting and receiving electric power.

[0026] Further, the electric vehicle charging control device can communicate the charging control signal generated via the CP port with an external vehicle.

[0027] The electric vehicle charging system according to the present invention may include an electric vehicle charging control device for controlling a V2V mode, an inlet configured to send and receive power and signals in the V2V mode, a battery unit configured to transmit power according to the V2V mode, an inverter configured to convert DC power transmitted from the battery unit into AC power, and a junction box configured to transmit power transmitted from the battery unit to the inlet.

[0028] Furthermore, the V2V mode may include at least one of the AC charging mode and the DC charging mode.

[0029] An electric vehicle charging system inlet according to one embodiment of the present invention may include a first inlet for AC charging mode and a second inlet for DC charging mode.

[0030] Furthermore, when performing the AC charging mode, the electric vehicle charging control device may be configured to generate a control signal that transmits power from the battery unit to the inverter and transmits power from the inverter to the first inlet.

[0031] Furthermore, when performing at least one of the AC charging mode and DC charging mode, the electric vehicle charging control device may be configured to generate a control signal that transmits power from the battery to the junction box and transmits power from the junction box to the second inlet.

[0032] Furthermore, the AC charging mode may be an AC charging mode that conforms to at least one of Type 1, Type 2, or GB / t standards.

[0033] Furthermore, at least one of the AC charging and DC charging methods may conform to at least one of the CCS1 and CCS2 standards.

[0034] An inlet of an electric vehicle charging system according to one embodiment of the present invention may be configured to transmit and receive both power and signals in the AC charging mode and power and signals in the DC charging mode.

[0035] Furthermore, when performing the AC charging mode, the electric vehicle charging control device can generate a control signal to transmit power from the battery unit to the inverter and from the inverter to the inlet, and when performing the DC charging mode, the electric vehicle charging control device can generate a control signal to transmit power from the battery unit to the junction box and from the junction box to the inlet.

[0036] Furthermore, the AC charging mode and the DC charging mode may conform to the NACS standard.

[0037] Furthermore, when the electric vehicle charging control device operates in V2V mode, it may further include a communication unit that communicates charging control information with an external source.

[0038] The electric vehicle charging control method according to the present invention may include the steps of: generating a V2V mode control signal in an electric vehicle charging control device; transmitting power from the battery unit to an inverter or junction box based on the V2V mode control signal; and transmitting power from the inverter or junction box to an inlet based on the V2V mode control signal.

[0039] Furthermore, the V2V mode may include AC charging mode and DC charging mode.

[0040] Furthermore, when performing the AC charging mode, the power from the battery unit can be transmitted to the inverter, and when performing the DC charging mode, the power from the battery unit can be transmitted to the junction box. [Effects of the Invention]

[0041] According to the present invention, an electric vehicle charging control device that assists in vehicle-to-vehicle charging can effectively detect errors that occur when switching charging modes.

[0042] Furthermore, electric vehicle charging control devices that support vehicle-to-vehicle charging can reduce noise in charging control signals and improve cost-effectiveness.

[0043] Furthermore, the vehicle-to-vehicle charging control device can effectively detect errors that occur during charging mode switching, and by detecting these errors, it can control charging to minimize charging safety risks. [Brief explanation of the drawing]

[0044] [Figure 1] This is a conceptual diagram of an electric vehicle and an electric vehicle charging station. [Figure 2] This is a diagram illustrating the configuration of an electric vehicle battery charging system. [Figure 3] This is a conceptual diagram of electric vehicle-to-electric vehicle charging according to the present invention. [Figure 4a] This is a diagram showing a circuit for controlling the charging of electric vehicles according to the present invention. [Figure 4b] This is a diagram showing a circuit for controlling charging in an electric vehicle and charging station system according to the present invention. [Figure 5] This is a diagram illustrating the linear regulator (LDO) included in the charging control signal generation unit. [Figure 6] This is a diagram illustrating the DC-DC converter included in the charging control signal generation unit. [Figure 7] This is a diagram illustrating a charging control signal generation unit including a DC-DC converter. [Figure 8] This is a diagram illustrating a charging control signal generation unit including a linear regulator according to one embodiment of the present invention. [Figure 9]This is a diagram showing a circuit for controlling the charging mode of an electric vehicle according to the present invention. [Figure 10] This diagram illustrates the operation of the integrated charging control circuit when the electric vehicle according to the present invention is operating in EV mode. [Figure 11] This diagram illustrates the operation of the integrated charging control circuit when the electric vehicle according to the present invention is operating in EVSE mode. [Figure 12a] This diagram illustrates the voltage values ​​detected according to the charging mode of an electric vehicle according to the present invention. [Figure 12b] This diagram illustrates the voltage values ​​detected according to the charging mode of an electric vehicle according to the present invention. [Figure 13] This is a diagram illustrating a positive voltage detection circuit for an electric vehicle charging control circuit according to the present invention. [Figure 14] This is a diagram illustrating a negative voltage detection circuit for an electric vehicle charging control circuit according to the present invention. [Figure 15] This is a diagram illustrating a switch operation detection circuit for an electric vehicle charging control circuit according to the present invention. [Figure 16] This is a diagram illustrating an electric vehicle equipped with an electric vehicle charging system for car-to-car charging according to one embodiment of the present invention. [Figure 17] Figure 16 is a diagram illustrating power transmission according to the charging type of the electric vehicle charging system. [Figure 18] This is a diagram illustrating an electric vehicle equipped with an electric vehicle charging system for car-to-car charging according to one embodiment of the present invention. [Figure 19] Figure 18 is a diagram illustrating power transmission according to the charging type of the electric vehicle charging system. [Figure 20] This is a flowchart illustrating a method for car-to-car charging according to one embodiment of the present invention. [Modes for carrying out the invention]

[0045] Specific details of the embodiments are included in the detailed description and drawings.

[0046] The advantages and features of the present invention, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be embodied in a variety of different forms. These embodiments are provided merely to complete the disclosure of the present invention and to fully inform a person ordinary skill in the art to which the invention pertains, of the scope of the invention, which is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0047] Figure 1 is a conceptual diagram of an electric vehicle and an electric vehicle charging station.

[0048] An electric vehicle battery charging system can operate by transmitting and receiving charging control signals, charging control information, and power from electric vehicle supply equipment (EVSE) to an electric vehicle.

[0049] As illustrated, the EVSE can be located at a charging station. The EVSE may also be located in a home or be implemented in a portable form. Furthermore, the EVSE may be implemented within an electric vehicle (EV) and through it, capable of performing the function of charging other electric vehicles (EVs).

[0050] Figure 2 is a diagram showing the configuration of an electric vehicle battery charging system, including EVSE.

[0051] As shown in the diagram, the electric vehicle battery charging system may include EV10, EVSE20, and a connector / inlet 300 connecting EV10 and EVSE20. EV10 may include an onboard charger 11, a charging control unit 12, a monitoring unit 13, and a battery unit 14.

[0052] The onboard charger 11 can convert power received from the EVSE 20 to the high-voltage battery to charge the battery when performing slow charging or AC charging of the electric vehicle. The onboard charger 11 may also be implemented to amplify, rectify, cut off high voltage, and perform CAN communication for slow charging or AC charging. Furthermore, even when performing slow charging or AC charging, the onboard charger 11 may not be used by the charging control circuit inside the EV10.

[0053] The charging control unit 12 can communicate with the in-vehicle MCU (Micro Control Unit) and EVSE 20 to charge the electric vehicle's battery and can generate a charging control signal. Specifically, the in-vehicle MCU may include components related to electric vehicle battery charging, such as a BMS (Battery Management System), BMU (Battery Management Unit), CMU (Cell Monitoring Unit), BMIC (Battery Monitoring Integrated Circuit), CMM (Cell Management Microcontroller), and BCU (Battery Control Unit).

[0054] The charging control unit 12 receives the charging control signal transmitted from the EVSE 20 and can generate information and signals for controlling the charging of the electric vehicle. The generated electric vehicle battery charging control signal is transmitted to the MCU inside the vehicle, enabling precise control of the battery charging process.

[0055] The monitoring unit 13 can perform tasks such as detecting overvoltage, current leakage, abnormal signal generation, and the presence or absence of circuit isolation during electric vehicle battery charging. For example, the monitoring unit 13 can detect whether EVSE20 and EV10 are electrically connected for electric vehicle battery charging, and can detect whether EV10 is connected to ground for the safety of electric vehicle battery charging.

[0056] The battery unit 14 can store the power transmitted from the EVSE 20 during electric vehicle battery charging. Furthermore, the battery unit 14 can measure State of Charge (SOC) information, which represents the state of the stored power, and convert that power.

[0057] Referring to Figure 2, the EVSE20 may include a power transmission unit 21 and a charge control unit 22. The power transmission unit 21 can transmit power to the EV10 based on charge control signals and information. The charge control unit 22 can transmit signals to control charging, and can start and stop charging, via communication with the charge control unit 12 of the EV10.

[0058] Communication between the EVSE20's charge control unit 22 and the EV10's charge control unit 12 may be conducted using standard protocols such as CHAdeMO, CCS (Combined Charging System), GB / T, or NACS, but is not limited to these. For example, when using the CCS (Combined Charging System) protocol, charge control signals can be sent and received via PLC and PWM communication.

[0059] Furthermore, the charging control signal may be a charging control signal conforming to a standard specification such as CHAdeMO, CCS, GB / T, or NACS, and can satisfy the requirements for various charging control signals defined in each standard specification.

[0060] The connector / inlet 30 can connect the communication of power and charging control signals and information between the EVSE 20 and the EV10. Specifically, the connector / inlet 30 may include a Power port, a Ground port, a CP (Control Pilot) port, and a PD (Proximity Detection) port. The Power port can transmit power transmitted from the EVSE 20 to the EV10. The CP (Control Pilot) port can transmit signals for controlling charging and can support PLC (Power Line Communication), PWM (Power Width Modulation), and / or CAN (Controller Area Network) communication protocols. The PD port can sense whether the connector is plugged into the inlet.

[0061] Figure 3 is a conceptual diagram of electric vehicle-to-electric vehicle charging according to the present invention.

[0062] As illustrated, electric vehicle-to-electric vehicle charging can be carried out by connecting the first EV100 and the second EV200. The first EV100 can operate in EVSE mode or V2V (Vehicle to Vehicle) mode, transmitting and / or supplying power. The second EV200 can operate in EV mode, transmitting and / or receiving power.

[0063] In this specification, the EVSE mode may be named the V2V mode or the first mode, and the EV mode may be named the second mode.

[0064] The first EV100 may be configured to function to transmit and / or supply power to the second EV200, and to function to transmit and / or receive power from the EVSE20.

[0065] Figure 4a is a diagram showing a circuit for controlling the charging of an electric vehicle to another electric vehicle according to the present invention. Figure 4b is a diagram showing a circuit for controlling charging in an electric vehicle and charging station system according to the present invention.

[0066] Referring to Figure 4a, the first EV100 can operate in EVSE mode, which allows it to transmit and / or supply power to the second EV200. Therefore, the first EV100 may include a circuit 310 for EVSE mode charge control. The EVSE mode charge control circuit of the first EV100 may include a PWM signal generator. In the circuit 310 for EVSE mode charge control, Va is the voltage of the pilot wire measured at the output terminal of the first EV100, and Vg is the voltage inside the PWM signal generator.

[0067] When operating in EVSE mode, the first EV100 can control power transmission and / or supply by transmitting the generated PWM signal to the second EV200. The first EV100 can control charging by changing the duty cycle of the PWM signal in the PWM signal generation unit and transmitting it. Furthermore, the first EV100 can control charging more precisely via PLC (Power Line Communication) communication, which is possible via the PWM signal transmission circuit.

[0068] Referring to Figure 4b, the first EV100 can operate in EV mode, which means it can receive and / or be supplied with power from the EVSE20. Therefore, the first EV100 may include a circuit 320 for EV mode charging control. The EV mode charging control circuit of the first EV100 may include a resistor and a switch. In the circuit 320 for EV mode charging control, Vb is the voltage, duty cycle, and frequency measured by the first EV100. The EV mode charging control circuit of the first EV100 may include a switch S1 connected to a resistor. The magnitude of the voltage detected by the circuit may be controlled via the on / off switching of switch S1.

[0069] As shown in Figures 4a and 4b, the first EV100 may include circuits for operating in EV mode and EVSE mode. The circuit for operating in EV mode and the charging control circuit for operating in EVSE mode may be provided separately. However, the charging control circuits for operating in EV mode and EVSE mode may be provided as a single unit. In this case, the integrated circuit for operating in EV mode and EVSE mode may further include configurations for switching from EV mode to EVSE mode or from EVSE mode to EV mode.

[0070] According to one embodiment of the present invention, a charging control circuit for controlling the charging of a first EV100 operating in EVSE mode for supplying and / or transmitting power may be embodied in a form in which a charging control circuit for operating in EV mode and EVSE mode is integrated. The integrated charging control circuit may further include a switch S connected to a resistor R5 of a circuit 320 for controlling charging in EV mode in order to effectively switch between EV mode and EVSE mode. The integrated charging control circuit via the switch S can switch between EV mode and EVSE mode by switching the on / off state of the switch. The charging control circuit can also detect errors or abnormal conditions that occur during the switching process between EV mode and EVSE mode by monitoring the on / off state of the switch S.

[0071] Figure 5 is a diagram illustrating the linear regulator (LDO) included in the charging control signal generation unit.

[0072] The charging control signal generation unit of the present invention may include a linear regulator to generate a signal for controlling V2V (Vehicle-to-Vehicle) charging. The charging control signal for controlling charging may be a PWM (Pulse Width Modulation) signal.

[0073] In this invention, a linear regulator can be used to supply a stable voltage during the process of generating a PWM (Pulse Width Modulation) signal. Specifically, the linear regulator may be an LDO (Low Dropout Regulator).

[0074] As shown in the diagram, the linear regulator is input voltage V IN It receives an input, and has an internal resistance R LDO Output voltage V via OUT The circuit may be configured to output a load R, and the output voltage is the load R. LOAD It may be maintained stably through this. Furthermore, a linear regulator can linearly reduce the output voltage with respect to the input voltage through its internal resistance.

[0075] The charging control signal generation unit can improve the accuracy of the charging control signal by performing precise voltage adjustment while minimizing voltage drop using a linear regulator.

[0076] The main advantages of linear regulators (e.g., LDOs) are their high efficiency and low ripple noise due to their low voltage drop characteristics. Unlike conventional switching voltage regulators, LDOs do not contain high-frequency switching elements, resulting in less electromagnetic interference (EMI) and minimizing signal distortion within the charging system. Furthermore, LDOs offer fast response speeds, allowing them to quickly respond to voltage fluctuations required by the PWM signal generation unit, thereby ensuring the stability of the charging process. These characteristics enable reliable power conversion in V2V charging systems and contribute to effectively controlling voltage fluctuations that may occur during vehicle-to-vehicle charging.

[0077] Figure 6 is a diagram illustrating the DC-DC converter included in the charging control signal generation unit.

[0078] In this invention, the charge control signal generation unit for V2V (Vehicle-to-Vehicle) charging may include a DC-DC converter to perform power conversion. The charge control signal for controlling charging may be a PWM (Pulse Width Modulation) signal.

[0079] As illustrated, a DC-DC converter may include at least one of a switching device, a diode, an inductor, and a capacitor, and such circuit elements can work together to perform efficient voltage conversion.

[0080] The switching element is periodically switched on and off based on the PWM signal, thereby regulating the voltage by storing and releasing energy in the inductor.

[0081] Furthermore, DC-DC converters can operate in a boost mode to generate an output voltage higher than the input voltage, thereby maintaining the voltage level required by V2V charging systems. When the switching element is turned on, the inductor stores energy, and when the switching element is turned off, the stored energy is released to the capacitor via the diode, allowing the converter to operate in a way that increases the output voltage.

[0082] The DC-DC converter can provide high conversion efficiency and ensure the stability of the power supply required by the PWM signal generation unit. Furthermore, it can improve responsiveness through high-speed switching, minimizing voltage fluctuations that may occur during the charging process and enhancing the accuracy of the charging control signal.

[0083] In the V2V (Vehicle-to-Vehicle) charging of the present invention, a linear regulator (e.g., an LDO) can be used to minimize signal distortion and supply a stable voltage.

[0084] While typical DC-DC converters, especially buck converters, can provide highly efficient power conversion, they operate using high-frequency switching, which means their output voltage is likely to contain switching noise.

[0085] On the other hand, linear regulators operate using a resistive voltage drop method, generating almost no switching noise during the voltage adjustment process and exhibiting a very low ripple characteristic in the output voltage. Therefore, they may have an advantage in maintaining the precise voltage level required by the charge control signal generation unit (e.g., a PWM (Pulse Width Modulation) signal).

[0086] Furthermore, DC-DC converters can generate EMI (Electromagnetic Interference) due to their output inductor and switching frequency, which can lead to a degradation in the quality of the charging control signal.

[0087] On the other hand, linear regulators generate almost no EMI during the power conversion process, ensuring stable operation without signal interference within the charge control system. This characteristic enhances the reliability of V2V charging systems, especially when implementing charging protocols that are sensitive to power fluctuations.

[0088] Furthermore, in terms of energy efficiency, linear regulators have the characteristic of converting power into heat and consuming it due to the difference between the input and output voltages, and their efficiency can be low when the difference between the input and output voltages is large. On the other hand, DC-DC converters generally offer a high conversion efficiency of 85% or more.

[0089] However, linear regulators that can be applied to the charging control signal generation unit have a relatively small difference between the input and output voltage, and can maintain signal quality while minimizing unnecessary power consumption. Therefore, in the charging control signal generation unit, when V2V charging control is performed, low noise characteristics may act as a more important factor than high power efficiency, and may offer advantages.

[0090] Furthermore, while DC-DC converters have high conversion efficiency, heat can be generated during the switching process. For example, heat can be generated in the MOSFET and inductor during high-speed switching.

[0091] On the other hand, linear regulators operate using a simple resistive voltage drop, eliminating the need for separate high-frequency switching elements, resulting in constant power loss and a simplified heat dissipation structure.

[0092] Linear regulators also offer advantages in terms of the area they occupy on a printed circuit board (PCB). DC-DC converters require many circuit elements such as inductors, capacitors, and switching elements, and therefore occupy a relatively large area on the PCB during circuit design.

[0093] On the other hand, linear regulators consist of relatively simple circuits and do not require additional inductors or large capacitors, which can be advantageous for miniaturization within a PCB. Such advantages allow for increased system integration and optimized design when circuits must be implemented in confined spaces, such as in V2V charge control systems.

[0094] Furthermore, the smaller the area occupied by the printed circuit board (PCB), the higher the power density on the side of the electric vehicle charge control unit (EVCC), which is an advantage.

[0095] Figure 7 is a diagram illustrating the charging control signal generation unit, which includes a DC-DC converter.

[0096] The charging control signal generation unit 400, which includes a DC-DC converter, performs DC-DC conversion based on the input voltage, and then generates a PWM signal to execute a charging protocol with an external vehicle.

[0097] The charging control signal generation unit 400 may include a voltage input unit 410, a positive DC-DC converter 420, a negative DC-DC converter 430, and a PWM signal generator 440. The voltage input unit 410 can receive voltage from the vehicle's internal power supply and convert it to +12V DC and -12V DC via the positive and negative DC-DC converters 420 and 430 before providing it to the PWM signal generator 440.

[0098] Furthermore, the absolute value of the voltage input to the voltage input section 410 may be less than 12V. For example, the voltage input to the voltage input section 410 may be 3.3V, and the input voltage may be converted to +12V_DC and -12V_DC via the positive and negative DC-DC converters 420 and 430.

[0099] The charging control signal generation unit 400 can transmit the input voltage supplied via the voltage input unit 410 to the positive DC-DC converter 420 and the negative DC-DC converter 430. The positive DC-DC converter 420 converts the input voltage to generate a +12V DC output, and the negative DC-DC converter 430 generates a -12V DC output. The voltages converted to positive and negative in this way are input to the PWM signal generator 440, which can ultimately generate a PWM signal for communication with an external vehicle and for charging control.

[0100] The PWM signal generator 440 may further include a 1kΩ output resistor to ensure that the generated PWM signal can be stably transmitted to an external vehicle. The current flow of the PWM signal is regulated through the output resistor (1kΩ), which minimizes interference and enables accurate signal transmission when transmitting signals to an external vehicle.

[0101] Figure 8 is a diagram illustrating a charging control signal generation unit including a linear regulator according to one embodiment of the present invention.

[0102] The charging control signal generation unit 500 can generate a stable PWM signal by utilizing a DC-DC converter and a linear regulator (LDO) from the input voltage 510. The charging control signal generation unit 500 may include a voltage input unit 510 for inputting the input voltage, a negative DC-DC converter 530, a PWM signal generator 540, and a linear regulator 550. The input voltage may be provided as, for example, 12V.

[0103] The input voltage of the voltage input section 510 is converted to -12V DC via the negative DC-DC converter 530 and can be generated as a stable +12V DC voltage via the linear regulator 550. The converted and generated positive and negative voltages are transmitted to the PWM signal generator 540, which can generate a PWM signal for charge control.

[0104] The input voltage provided from the voltage input unit 510 in the charging control signal generation unit 500 is supplied to the negative DC-DC converter 530 and the linear regulator 550. The negative DC-DC converter 530 converts the input voltage to generate a -12V DC output, and the linear regulator 550 can generate a low-noise +12V DC output based on the input voltage.

[0105] When the generated positive and negative voltages are input to the PWM signal generator 540, the PWM signal generator 540 can generate a PWM signal for performing charging communication with an external vehicle.

[0106] The PWM signal generated by the PWM signal generator 540 can be transmitted to an external vehicle via a 1kΩ output resistor. The output resistor (1kΩ) limits the signal current, ensuring the stability of the PWM signal.

[0107] The charging control signal generation unit 500 includes a linear regulator and has lower noise characteristics compared to the charging control signal generation unit 400 on a DC-DC converter board, offering the advantage of improved signal quality with external vehicles. Furthermore, the charging control signal generation unit 500 can use a linear regulator only for positive voltage conversion and a DC-DC converter for negative voltage conversion.

[0108] Specifically, the charging control signal generation unit 500 uses a linear regulator 550 to generate the positive electrode voltage (+12V_DC), but a DC-DC converter 530 can be used to generate the negative electrode voltage (-12V_DC). This is because while the linear regulator has the advantage of providing low noise and a stable voltage output, it can only be adjusted to a voltage lower than the input voltage.

[0109] Generally, linear regulators serve to reduce voltage and cannot generate voltages higher than the input voltage (e.g., 12V) or voltages with reversed polarity. Therefore, to generate a -12V DC voltage, a converter that can reverse voltage polarity can be used.

[0110] Furthermore, the DC-DC converter 530 utilizes a switching method to convert an input voltage (e.g., +12V) to -12V DC, providing high conversion efficiency. If a linear regulator were to be used in the process of generating -12V DC, an even more negative voltage than -12V DC would have to be supplied separately. This would require an additional power supply circuit, potentially increasing the complexity of the overall system.

[0111] On the other hand, using a DC-DC converter allows for the direct generation of a negative voltage even with a single input voltage (e.g., +12V), which simplifies the design and enables efficient power conversion.

[0112] Therefore, the power conversion efficiency of the charging control signal generation unit 500 can be improved by using a linear regulator 550 with low noise characteristics to generate the positive electrode voltage (+12V_DC) and applying a DC-DC converter 530 capable of polarity conversion to generate the negative electrode voltage (-12V_DC).

[0113] Figure 9 is a diagram showing a circuit for controlling the charging mode of an electric vehicle according to the present invention.

[0114] The circuit for controlling the charging mode of an electric vehicle according to the present invention may be an integrated charging control circuit that includes charging control circuits for operating in EVSE mode and EV mode. The integrated charging control circuit 600 may include a PMIC (Power Management Integrated Chip) 610, a power source 620, a PWM generation unit 630, a charging control unit 640, and a switch S. The PMIC 610 is connected to the power source 620 and can control the generation of a PWM signal. The PMIC 610 applies a first voltage to the power source 620, and the power source 620 can transform the first voltage into a second voltage and output it. The power source 620 can convert the first voltage into a second voltage and provide it to the PWM generation unit 630, which can generate a PWM signal based on the second voltage and transmit it to a second EV200 that receives and / or power from a first EV100.

[0115] The integrated charging control circuit 600 may further include a PLC generation unit that generates PLC signals. The PLC generation unit can perform charging control via PLC (Power Line Communication) communication. For example, charging control via PLC communication may be performed by bidirectional exchange of charging control signals for DC charging, fast charging, and high-speed charging.

[0116] When operating in EVSE mode, the charging control unit 640 can transmit a charging control signal (e.g., a CP signal) to an external source. The charging control unit 640 is connected to the power source 620 and can control the on / off state of the power source 620. For example, it can control the transmission of +12V and -12V voltages to the PWM generation unit 630 via GPIO (General Purpose Input / Output). The charging control unit 640 is also connected to the PWM generation unit 630 and can control the generation of the PWM signal. Specifically, it can control the generation of the voltage, duty cycle, and frequency of the PWM signal.

[0117] When operating in EV mode, the charging control unit 640 can receive an external charging control signal (e.g., a CP signal). The charging control unit 640 can receive the voltage, duty cycle, and frequency of the charging control signal. The charging control unit 640 can also receive and / or communicate the charging control signal via PLC communication and CAN communication. The charging control unit 640 may further include a communication unit for receiving and / or communicating the external charging control signal. The charging control unit 640 can also monitor and / or control the on / off state of switch S.

[0118] Switch S may be turned on or off to activate the corresponding circuit as the charging control circuit 600 operates in EVSE mode or EV mode. The on / off state of switch S may be controlled by an internal vehicle communication circuit (e.g., CAN communication and / or PLC communication). Alternatively, the on / off state of switch S may be controlled based on the type of object connected to the vehicle inlet and / or user settings. The operation of the charging control circuit 600 in response to the on / off state of switch S is described in more detail below.

[0119] Figure 10 is a diagram illustrating the operation of the integrated charging control circuit when the electric vehicle according to the present invention is operating in EV mode. Figure 11 is a diagram illustrating the operation of the integrated charging control circuit when the electric vehicle according to the present invention is operating in EVSE mode.

[0120] When the electric vehicle according to the present invention operates in EV mode, the integrated charging control circuit 600 can have switch S turned on. That is, when switch S is turned on, the integrated charging control circuit 600 operates in EV mode. While the integrated charging control circuit 600 is operating in EV mode, the power source 620 and the PWM generation unit 630 do not operate in the off state. On the other hand, charging control signals (e.g., CP signals and PLC signals) can be received from an external source by the charging control unit 640.

[0121] When the electric vehicle according to the present invention operates in EVSE mode, the integrated charging control circuit 600 can be set to the off state by switching S. That is, when switch S is set to the off state, the integrated charging control circuit 600 operates in EVSE mode. While the integrated charging control circuit 600 is operating in EVSE mode, the PMIC 610 applies a first voltage to the power source 620. The power source 620 then applies a second voltage to the PWM generation unit 630, and the PWM generation unit 630 converts the second voltage to generate a PWM signal. The generated PWM signal can be transmitted to the charging control unit of a second EV200 or power receiving device that receives and / or is supplied with external power. The integrated charging control circuit 600 may further include a PLC signal generation unit. The PLC signal generation unit can generate a PLC signal, and the integrated charging control circuit 600 can transmit the generated PLC signal to the charging control unit of the second EV200 or power receiving device via the CP port of the connector / inlet 30.

[0122] The integrated charging control circuit 600 can switch between EV mode and EVSE mode by changing the on / off state of switch S. Switching between EV mode and EVSE mode by changing the on / off state of switch S has cost advantages compared to having separate modules to support EV mode and EVSE mode, and control can be simplified by realizing each module on a single board. The integrated charging control circuit 600 enables switching between modes by integrating the circuits and modules that control EV mode and EVSE mode into one. Error sensing and monitoring are also necessary to sense and monitor errors that occur during the switching process.

[0123] When the integrated charging control circuit 600 switches from EV mode to EVSE mode, the integrated charging control circuit 600 can monitor the voltage of the power source 620. Specifically, in EV mode, since switch S is ON, the power source 620 and PWM generation unit 630 are OFF, and therefore the voltage detected and monitored by the (positive / negative) voltage detection circuit is 0V. On the other hand, in EVSE mode, since switch S is OFF, the power source 620 is ON, and as a result, +12V can be detected and monitored by the positive voltage detection circuit and -12V by the negative voltage detection circuit.

[0124] When the integrated charging control circuit 600 switches from EV mode to EVSE mode, the integrated charging control circuit 600 can monitor the state of switch S connected to resistor R5. Specifically, as mentioned above, switch S is in the ON state in EV mode and in the OFF state in EVSE mode. The integrated charging control circuit 600 can detect and / or monitor the ON / OFF state of switch S. For example, the integrated charging control circuit 600 can detect and / or monitor the ON / OFF state of switch S via stack monitoring. Stack monitoring can detect whether the voltage measured via the ADC (Analog-to-Digital Converter) appropriately switches between the voltage range corresponding to the ON state and the voltage range corresponding to the OFF state (e.g., a predetermined critical value).

[0125] A switch S according to one embodiment of the present invention may be switched based on a switching signal from EV mode to EVSE mode (e.g., a control unit signal such as a BMS and / or CMU) received via internal vehicle communication (e.g., CAN communication). In this case, the integrated charging control circuit 600 can monitor the state of the switch S described above.

[0126] An integrated charging control circuit 600 according to one embodiment of the present invention may further include a monitoring unit. The monitoring unit may include a BMU, CMU, MCU and / or monitoring circuitry, and can monitor the state of the switch S and the voltage and / or state of the power source 620.

[0127] Furthermore, if the monitored state value of switch S and / or the monitored state value of power source 620 does not match a predetermined normal state value, the monitoring unit can transmit an abnormal state value to the charge control unit 640. For example, when switch S is in the ON state, if the voltage value corresponding to the normal state is 2.5V, then if 4V is monitored, the monitored 4V can be transmitted to the charge control unit 640 as an abnormal state value.

[0128] Figures 12a and 12b are diagrams illustrating the voltage values ​​detected according to the charging mode of the electric vehicle according to the present invention.

[0129] An integrated charging control circuit 600 according to one embodiment of the present invention can be switched from EV mode to EVSE mode and operated by changing the state of switch S from on to off.

[0130] In one embodiment of the present invention, the power source 620 is in the off state when operating in EV mode, so 0V can be detected and / or monitored. Conversely, when operating in EVSE mode, the power source 620 is in the on state, so +12V and -12V can be monitored and / or detected.

[0131] According to one embodiment of the present invention, when the switch S is operating in EV mode, it is in the ON state, so 0V can be detected and / or monitored. When the switch S is operating in EVSE mode, it is in the OFF state, so 2.5V can be detected and / or monitored. It should be understood that the value of 2.5V may vary depending on the configuration of the detection circuit for detecting and / or monitoring the ON state of the switch, and that other values ​​other than voltage may be detected.

[0132] Furthermore, the integrated charging control circuit 600 according to one embodiment of the present invention may further include a monitoring unit. The monitoring unit can monitor the state of the power source 620 and / or switch S. The monitoring unit may include a positive voltage detection circuit and a negative voltage detection circuit for the power source 620. The monitoring unit may include a circuit for detecting the operating state of switch S.

[0133] Figure 13 is a diagram illustrating a positive voltage detection circuit for an electric vehicle charging control circuit according to the present invention. Figure 14 is a diagram illustrating a negative voltage detection circuit for an electric vehicle charging control circuit according to the present invention. Figure 15 is a diagram illustrating a switch operation detection circuit for an electric vehicle charging control circuit according to the present invention.

[0134] A positive voltage detection circuit in an electric vehicle charging control circuit according to one embodiment of the present invention may be a circuit for detecting a positive voltage when the integrated charging control circuit 600 is operating in EVSE mode. The positive voltage detection circuit may include an ADC (Analog-to-Digital Converter) located at one end of the circuit, a capacitor connected to the ground, a resistor connected to the ground, and a resistor connected to the detection terminal.

[0135] A negative voltage detection circuit in an electric vehicle charging control circuit according to one embodiment of the present invention may include an amplification circuit for detecting a negative voltage. The amplification circuit may include a diode, a positive voltage power supply, and an amplifier. Specifically, the negative voltage input via the diode and the positive voltage power supply in the circuit are input to the amplifier, and the negative voltage can be detected at the output of the amplifier. Furthermore, a negative voltage detection circuit in an electric vehicle charging control circuit according to one embodiment of the present invention can receive a -12V_Negative signal at one end and detect and / or monitor a negative voltage at the other end.

[0136] A switch operation detection circuit for an electric vehicle charging control circuit according to one embodiment of the present invention may include a resistor (S_R3) connected to the switch and an amplifier. When the switch is in the ON state, a voltage is applied through the resistor (S_R3) connected to the switch, and the applied voltage is input to the amplifier so that a predetermined voltage value can be detected and / or monitored. On the other hand, when the switch is in the OFF state, no voltage is applied through the resistor (S_R3) connected to the switch, so 0V can be detected and / or monitored. The resistance value of the resistor (S_R3) connected to the switch may be 2.75Ω.

[0137] Furthermore, the switch operation detection circuit of the electric vehicle charging control circuit according to one embodiment of the present invention can receive an on / off control signal input from a switch connected to a resistor (S_R3) at one end. One end of the resistor (S_R3) connected to the switch may be connected to a CP (Control Pilot) line.

[0138] Figure 16 is a diagram illustrating an electric vehicle equipped with an electric vehicle charging system for vehicle-to-vehicle charging according to one embodiment of the present invention. Figure 17 is a diagram illustrating power transmission according to the charging type of the electric vehicle charging system in Figure 16.

[0139] An electric vehicle charging system 700 for vehicle-to-vehicle charging according to one embodiment of the present invention may include charging inlets 711, 712, a battery 720, an inverter 730 that converts DC to AC voltage, and a junction box 740.

[0140] The charging inlets 711 and 712 can transmit power and signals from the electric vehicle's battery 720 to charge other vehicles. Specifically, they can transmit charging control signals generated via the charging control circuit 600 to other vehicles and transmit and receive signals from other vehicles. They can also transmit power from the battery 720 to other vehicles.

[0141] The charging inlets 711 and 712 can transmit power according to the charging type (e.g., fast charging, slow charging, AC charging, DC charging, etc.) when the electric vehicle charging system 700 is operating in V2V mode.

[0142] The junction box 740 may be configured to transmit power from the battery for vehicle-to-vehicle charging to the onboard charger, inverter, and electrical component inlet 712. The junction box 740 can also use relays to interrupt high voltages. Furthermore, if high voltages rise abnormally, safety protection can be provided by interrupting the high voltages via fuses or relays.

[0143] The electric vehicle charging system 700 may be configured to transmit power from the battery 720 to other vehicles via appropriate inlets 711, 712, depending on the type of electric vehicle charging (e.g., fast charging, slow charging, AC charging, DC charging, etc.). For example, in the case of charging that only performs AC charging, the electric vehicle charging system 700 can transmit power from the battery 720 to the inverter 730, and the power converted by the inverter 730 to have an AC voltage can be transmitted to other vehicles via inlet 711.

[0144] As illustrated, charging that performs only AC charging may be Type 1 according to the SAE J1772 standard mainly used in the United States, South Korea, and Japan, Type 2 mainly used in Europe, or GB / T charging, which is the Chinese charging standard. However, it should be understood that the electric vehicle charging system 700 according to the present invention is not limited to the above-mentioned charging standards and can perform charging according to charging standards that will be established in the future.

[0145] An electric vehicle charging system 700 according to one embodiment of the present invention transmits power from a battery 720 to a junction box 740 when performing charging of at least one of AC and DC charging types, and the junction box 740 can transmit power to other vehicles via an inlet 712.

[0146] As illustrated, charging that performs at least one of AC charging type and DC charging type may be CCS 1 (DC combo), which is mainly used in the United States and South Korea, or CCS 2 (DC combo), which is mainly used in Europe. However, it should be understood that the electric vehicle charging system 700 according to the present invention is not limited to the charging standards described above and can perform charging according to charging standards to be established in the future.

[0147] Figure 18 is a diagram illustrating an electric vehicle equipped with an electric vehicle charging system for vehicle-to-vehicle charging according to one embodiment of the present invention. Figure 19 is a diagram illustrating power transmission according to the charging type of the electric vehicle charging system in Figure 18.

[0148] An electric vehicle charging system 800 for vehicle-to-vehicle charging according to one embodiment of the present invention may include a charging inlet 810, a battery 820, an inverter 830 that converts DC to AC voltage, and a junction box 840.

[0149] The charging inlet 810 can transmit power and signals from the battery 820 to charge other vehicles. Specifically, the charging inlet 810 can transmit charging control signals generated via the integrated charging control circuit 600 to other vehicles and can send and receive signals received from other vehicles. The charging inlet 810 can also transmit power from the battery 820 to other vehicles.

[0150] The charging inlet 810 can transmit power of the appropriate charging type (e.g., fast charging, slow charging, AC charging, and / or DC charging) when the electric vehicle charging system 800 is operating in V2V mode.

[0151] The junction box 840 may be configured to transmit power from the battery 820 for vehicle-to-vehicle charging to the onboard charger, inverter 830, and electrical component inlets. The junction box 840 can also use relays to interrupt high voltages. For example, if high voltage rises abnormally, the junction box 840 can perform a safety protection function by interrupting the high voltage via fuses and / or relays.

[0152] The electric vehicle charging system 800 may be configured to transmit power from the battery 820 to other vehicles via the charging inlet 810, depending on the type of electric vehicle charging (e.g., fast charging, slow charging, AC charging, and / or DC charging). The charging inlet 810 of the electric vehicle charging system 800 may also be configured to transmit power from all different charging types (e.g., AC charging and DC charging). For example, in the case of AC charging, power from the battery 820 is transmitted to the inverter 830, and the power converted to have an AC voltage by the inverter 830 is transmitted to other vehicles via the charging inlet 810. In the case of DC charging, power from the battery 820 is transmitted to the junction box 840, and the junction box 840 can transmit power to other vehicles via the charging inlet 810.

[0153] As illustrated, the charging system 800, configured to transmit power from all different charging types, may perform charging according to the NACS (TESLA Super Charger) standard used in North America. However, it should be understood that the electric vehicle charging system 800 according to the present invention is not limited to this and can perform charging according to future charging standards.

[0154] Figure 20 is a flowchart illustrating a method for car-to-car charging according to one embodiment of the present invention.

[0155] A method for vehicle-to-vehicle charging according to one embodiment of the present invention may include the steps of: generating a charging control signal in V2V mode (S110); transmitting power from batteries 720, 820 to inverters 730, 830 and / or junction boxes 740, 840 according to the charging type (S120); and transmitting power from inverters 730, 830 and / or junction boxes 740, 840 to other vehicles via charging inlets 711, 712, 810 (S130).

[0156] The step of generating a charging control signal in V2V mode (S110) may be performed by the electric vehicle charging control device and / or integrated charging control circuit 600, which can generate a charging control signal for controlling the battery charging of another vehicle in V2V mode. Specifically, when the electric vehicle charging systems 700, 800 are operating in AC charging mode or DC charging mode, they can generate charging control signals (e.g., CP signals and / or PLC signals) for carrying out the charging process in each charging mode.

[0157] The step (S120) of transmitting power from batteries 720,820 to inverters 730,830 and / or junction boxes 740,840 may be performed by controlling the electric vehicle charging systems 700,800 based on the charging control signals generated in step (S110). For example, when the electric vehicle charging systems 700,800 are operating in AC charging mode, power from batteries 720,820 is transmitted to inverters 730,830, which can output power by converting the DC voltage to AC voltage for transmission to other vehicles. Alternatively, for example, when the electric vehicle charging systems 700,800 are operating in DC charging mode, power from batteries 720,820 is transmitted to junction boxes 740,840, which can provide a power path for transmission to other vehicles along with high-voltage cutoff and protection functions.

[0158] The step (S130) of transmitting power from inverters 730, 830 and / or junction boxes 740, 840 to charging inlets 711, 712, 810 may be performed by transmitting power output from inverters 730, 830 and / or junction boxes 740, 840 to charging inlets 711, 712, 810 and transmitting power via charging inlets 711, 712, 810 for battery charging of other vehicles. The electric vehicle charging control device and / or integrated charging control circuit 600 may also perform wired communication with other vehicles to control battery charging of other vehicles, and the wired communication may be implemented by sending and receiving charging control signals via charging inlets 711, 712, 810.

[0159] The scope of the present invention is not limited to the embodiments described above, but can be embodied in various forms within the appended claims. The claims of the present invention are deemed to be within a wide range of forms that can be modified by anyone with ordinary skill in the art to which the invention pertains, without departing from the spirit of the invention as claimed in the claims.

Claims

1. In an electric vehicle charging control device, A power input section configured to supply an input voltage, A charging control signal generation unit that generates a charging control signal based on the input voltage supplied from the power input unit, Includes a charging control unit that determines the characteristics of the charging control signal generated by the charging control signal generation unit, The charging control signal generation unit, Includes multiple voltage conversion units, Each of the aforementioned plurality of voltage conversion units converts voltage using a different voltage conversion method. Electric vehicle charging control device.

2. The charging control signal generation unit, The system further includes a PWM signal generator that generates the charging control signal using the converted voltages output from the plurality of voltage conversion units as input. The electric vehicle charging control device according to claim 1.

3. The aforementioned charging control signal is a PWM (Pulse Width Modulation) signal. The electric vehicle charging control device according to claim 1.

4. The plurality of voltage conversion units are, A positive voltage conversion unit that converts the input voltage into a positive voltage, Includes a negative voltage conversion unit that converts the input voltage into a negative voltage, The electric vehicle charging control device according to claim 1.

5. The positive voltage conversion unit includes a linear regulator circuit. The electric vehicle charging control device according to claim 4.

6. The negative voltage conversion unit includes a DC-DC converter circuit. The electric vehicle charging control device according to claim 4.

7. The aforementioned charging control signal is A signal that controls charging according to at least one of the following standards: CHAdeMO, CCS, NACS, and GB / T. The electric vehicle charging control device according to claim 1.

8. Further including the inlet, The inlet includes a CP port for transmitting and receiving charging control signals and a power port for transmitting and receiving power. The electric vehicle charging control device according to claim 1.

9. In electric vehicle charging systems, An electric vehicle charging control device for controlling V2V mode, An inlet configured to transmit and receive power and signals in the V2V mode, A battery unit configured to transmit power according to the V2V mode, An inverter configured to convert DC power transmitted from the battery unit into AC power, An electric vehicle charging system, comprising: a junction box configured to transmit power transmitted from the battery unit to the inlet.

10. The inlet includes a first inlet for AC charging mode and a second inlet for DC charging mode. The electric vehicle charging system according to claim 9.

11. When performing the AC charging mode, the electric vehicle charging control device is configured to generate a control signal that transmits power from the battery unit to the inverter and transmits power from the inverter to the first inlet. The electric vehicle charging system according to claim 10.

12. When performing at least one of the AC charging mode and DC charging mode, the electric vehicle charging control device is configured to generate a control signal that transmits power from the battery unit to the junction box and transmits power from the junction box to the second inlet. The electric vehicle charging system according to claim 10.

13. In the V2V mode, the inlet is configured to transmit and receive both power and signals in the AC charging mode and power and signals in the DC charging mode. The electric vehicle charging system according to claim 9.

14. When performing the AC charging mode, the electric vehicle charging control device generates a control signal that transmits power from the battery unit to the inverter and transmits power from the inverter to the inlet. When performing the DC charging mode, the electric vehicle charging control device generates a control signal that transmits power from the battery unit to the junction box and transmits power from the junction box to the inlet. The electric vehicle charging system according to claim 13.

15. When the electric vehicle charging control device operates in V2V mode, it further includes a communication unit that communicates charging control information with the outside. The electric vehicle charging system according to claim 9.

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