Mobile power conversion apparatus for charging electric vehicle and control method thereof

Abstract

Disclosed are a mobile power conversion apparatus for charging an electric vehicle and a control method thereof. An embodiment of the present disclosure provides a mobile power conversion apparatus for charging an electric vehicle, the mobile power conversion apparatus including: a first charging interface electrically connected to an external AC charger on one side; a second charging interface electrically connected to an external vehicle on the other side, the vehicle having no on-board charger (OBC); a power supply, such as a switched mode power supply (SMPS), configured to supply power to an interior of the device; an AC / DC converter configured to convert AC power input from the AC charger into DC power capable of charging a high-voltage battery of the vehicle; and a controller configured to execute vehicle charging control of supplying the DC power converted by the AC / DC converter to the vehicle.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0122960, filed with the Korean Intellectual Property Office on September 10, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a mobile power conversion device and its control method for charging electric vehicles, and more particularly, to a mobile power conversion device and its control method for charging electric vehicles that supports AC charging of electric vehicles from external charging infrastructure. Background Technology

[0004] Typically, electric vehicles (including EVs and PHEVs) can charge their internal high-voltage batteries by connecting a charging cable from an external charging infrastructure such as an Electric Vehicle Power Supply (EVSE).

[0005] For example, Figure 5 A conventional AC slow charging system for charging electric vehicles is shown.

[0006] Reference Figure 5 Traditional AC EVSEs in homes and / or public utilities can only supply AC power to electric vehicles. For this reason, traditional EVs require an on-board charger (OBC), which converts the input AC power into direct current (DC) output power. In other words, the OBC in an EV converts AC power supplied by an external AC slow charger into DC power to slowly charge the high-voltage battery. Therefore, traditional EVs can only use an AC slow charger when equipped with an OBC.

[0007] However, OBCs are expensive components, and installing OBCs in electric vehicles has the problem of reduced electric range (driving distance) due to increased vehicle weight and price (manufacturing cost).

[0008] Conversely, if an electric vehicle does not have an OBC (Original Bus Charger), users face the inconvenience of constantly searching for DC fast charging infrastructure because they cannot use AC slow chargers, leading to user dissatisfaction.

[0009] The information disclosed in this background section is only intended to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0010] The embodiments of this disclosure aim to provide a mobile power conversion device for vehicle charging, which utilizes a bidirectional charging interface to connect a slow charger that can only supply AC power to a vehicle that can only perform DC charging, and provides smooth vehicle charging through AC-DC power conversion.

[0011] Another embodiment of this disclosure aims to provide a mobile power conversion device for vehicle charging that reduces weight, increases electric range, and lowers costs by eliminating the need for an onboard charger (OBC) inside the vehicle, and provides smooth AC charging between a slow charger and a vehicle without an OBC.

[0012] Embodiments of this disclosure provide a mobile power conversion device for charging an electric vehicle, the mobile power conversion device comprising: a first charging interface electrically connected on one side to an external AC charger; a second charging interface electrically connected on the other side to an external vehicle, the vehicle having no on-board charger (OBC); a power source, such as a switch-mode power supply (SMPS), configured to supply power to the device's internal components; an AC / DC converter configured to convert AC power input from the AC charger into DC power capable of charging the vehicle's high-voltage battery; and a controller configured to perform vehicle charging control by supplying the DC power converted by the AC / DC converter to the vehicle.

[0013] The first charging interface may include: an inlet plug, which connects to the charging connector of the AC charger to enable charging communication; a proximity detection (PD) module configured to detect that the charging connector of the AC charger is connected to the inlet plug; and a control pilot (CP) input module configured to perform low-level pulse-width modulation (PWM)-based communication with the AC charger when the charging communication connection is established.

[0014] The second charging interface may include: a cable connector for connecting to the vehicle's charging plug to enable charging communication; a power line communication (PLC) modem configured to perform advanced communication with the vehicle; and a CP output module required for advanced communication by the PLC modem.

[0015] The PLC modem can be configured to support advanced communication with the vehicle based on the international electric vehicle charging standards DIN 70121 or ISO 15118.

[0016] The power supply can be configured to supply power when the power switch Q3 for power activation inside the device is operated, and may include a regulator configured to maintain the power at a constant voltage required for the operation of the components inside the device.

[0017] The power switch Q3 can be configured as a push-pull switch and can be operated ON / OFF by the user.

[0018] The AC / DC converter can be connected to the inlet plug of the first charging port via an AC cable at the input end, and can be connected to the cable connector of the second charging port via a DC cable at the output end.

[0019] The AC line may include an L1 line and a N line, and is used to input AC power into the AC / DC converter. The DC line may include a DC+ line and a DC- line, and is used to output DC power converted from the AC / DC converter.

[0020] The first relay Q1 and the second relay Q2 can be installed on the DC+ line and DC- line of the DC line, respectively, to transmit or block DC power to the vehicle.

[0021] The controller can perform vehicle charging control based on status information collected from outside or inside the device, monitor status information or control results, and output status information or control results through the display unit.

[0022] The controller may include: a ready light to indicate the power activation status of the device; a charging light to indicate the ON / OFF state of vehicle charging; and a malfunction light to indicate an abnormality in the device.

[0023] Another embodiment of this disclosure provides a control method for a mobile power conversion device for charging an electric vehicle. The control method includes the following steps: connecting an external AC charger and a vehicle without an on-board charger (OBC) to a first charging port and a second charging port, respectively, and activating the internal power of the device by turning on a power switch Q3; checking whether the electrical connection status of the first charging port and the second charging port is normal in order to prepare for vehicle charging; if the electrical connection status is normal, operating the AC / DC converter and the first relay Q1 and the second relay Q2 installed on the DC line to ON; and converting the AC power input from the AC charger into DC power through the AC / DC converter and supplying the DC power to the vehicle to perform vehicle charging control.

[0024] The steps for checking whether the electrical connection status is normal may include the following steps: collecting the CP PWM signal of the AC charger through the first charging interface, and determining whether the connection is normal by comparing the CP status and PD voltage with their respective reference values; if at least one of the CP voltage and PD voltage does not meet the corresponding reference value, an abnormal connection status is determined, and an abnormal situation is indicated by illuminating the fault light on the display; or, if both the CP voltage and PD voltage meet the corresponding reference values, the second switch SW2 located on the first charging interface side is operated to ON.

[0025] The steps to check whether the electrical connection status is normal may include the following steps: generating CP±12VPWM from the AC charger side and turning on the first switch SW1 located on the second charging interface side; and turning on the PLC modem and connecting to the vehicle's advanced communication via the second charging interface.

[0026] The steps for performing vehicle charging control may include the following: indicating the vehicle charging status by illuminating the charging indicator on the display.

[0027] The control method for the mobile power conversion device may further include the following steps after performing the vehicle charging control step: inputting one of the following during vehicle charging control: charging termination of the AC charger, charging termination of the vehicle, and occurrence of an internal fault; and terminating vehicle charging by disconnecting the AC / DC converter and the first relay Q1 and the second relay Q2.

[0028] The steps to terminate vehicle charging may include: indicating the vehicle charging termination status by turning off the charging light on the display, and illuminating the fault light on the display to further indicate the internal fault status when an internal fault occurs. Attached Figure Description

[0029] Figure 1 A schematic diagram of a mobile power conversion device for charging an electric vehicle according to an embodiment of the present disclosure is shown.

[0030] Figure 2 The components of a mobile power conversion device for charging an electric vehicle are schematically shown according to an embodiment of the present disclosure.

[0031] Figure 3 and Figure 4 A flowchart illustrating a control method for a mobile power conversion device for charging an electric vehicle according to an embodiment of the present disclosure is shown schematically.

[0032] Figure 5 A conventional AC slow charging system for charging electric vehicles is shown. Detailed Implementation

[0033] The present disclosure will be described more fully below with reference to the accompanying drawings, in which embodiments of the present disclosure are shown.

[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well. When used in this specification, the terms “comprising” and / or “including,” “containing,” and / or “comprising” specify the presence of the mentioned features, integrals, steps, operations, constituent elements, and / or components, but it will also be understood that this does not exclude the presence or addition of one or more other features, integrals, steps, operations, constituent elements, components, and / or groups thereof. As used herein, the term “and / or” includes any one or all combinations of the associated and listed items.

[0035] Throughout this specification, terms such as first, second, "A", "B", (a), (b), etc., will be used only to describe the various constituent elements and will not be construed as limiting these constituent elements. These terms are only used to distinguish one element from another, and the characteristics or order of the elements are not limited by these terms.

[0036] Throughout this specification, it should be understood that when an element is described as being "connected" or "attached" to another element, that element may be "directly connected" or "attached" to the other element, or may be "connected" or "attached" to the other element via a third element. Conversely, it should be understood that when an element is described as being "directly connected" or "attached" to another element, there is no element between that element and the other element.

[0037] Throughout this specification, the terminology used herein is for the purpose of describing particular embodiments or examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular forms are intended to include the plural forms.

[0038] Furthermore, it is understood that one or more of the methods or aspects thereof described below can be operated by at least one or more controllers. The term "controller" can refer to a hardware device that includes a memory and a processor. The memory is configured to store program instructions, and the processor is specifically programmed to execute the program instructions to perform one or more processes described in more detail below. As described herein, a controller can control the operation of a control unit, module, component, device, or the like. Furthermore, it is understood that, as those skilled in the art will recognize, the following methods can be operated by a device that includes a controller and one or more other components.

[0039] In the following, a mobile power conversion device and its control method for charging electric vehicles according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0040] Figure 1 A schematic diagram of a mobile power conversion device for charging an electric vehicle according to an embodiment of the present disclosure is shown.

[0041] Reference Figure 1 When the vehicle 20 does not have an on-board charger (OBC) installed, it cannot be AC ​​charged using the AC charger 10, and the user always has to find a DC fast charger, which is inconvenient.

[0042] Therefore, according to an embodiment of the present invention, a mobile power conversion device 100 for charging electric vehicles is connected between an AC charger 10 that can only supply AC power to the vehicle and a vehicle 20 without an OBC (i.e., an electric vehicle that can only perform DC charging), so as to provide a smooth vehicle charging function through AC-DC power conversion.

[0043] Another object of this disclosure is to provide a mobile power conversion device for charging electric vehicles, which increases electric range and reduces vehicle price by eliminating the need for an on-board charger (OBC) inside the vehicle, and improves customer satisfaction by providing a smooth charging function between the AC charger 10 and the vehicle 20.

[0044] on the other hand, Figure 2 The components of a mobile power conversion device for charging an electric vehicle are schematically shown according to an embodiment of the present disclosure.

[0045] Reference Figure 2 According to an embodiment of the present disclosure, a mobile power conversion device 100 for charging an electric vehicle includes: a bidirectional charging interface (110, 120) electrically connecting an AC charger 10 disposed on one side to a vehicle 20 disposed on the other side; a switch-mode power supply (SMPS) 130 for supplying power to the device's internal components; an AC / DC converter 140 for converting AC power input from the AC charger 10 into DC power, which can charge the high-voltage battery of the vehicle 20; and a controller 150 for performing vehicle charging control to supply the vehicle 20 with the DC power converted by the AC / DC converter 140.

[0046] AC charger 10 is an external charging infrastructure, namely an electric vehicle power supply device (EVSE), and AC charger 10 can charge vehicle 20 by supplying only AC power.

[0047] Vehicle 20 can be an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV), which can be charged using only DC power without an on-board charger (OBC).

[0048] The mobile power conversion device 100 can be implemented as user-movable by installing the aforementioned components 110 to 150, as well as various circuit components and switching elements described later, inside the device and by providing external moving components such as wheels.

[0049] The mobile power conversion device 100 acts as a medium that supports vehicle charging between an AC charger 10 supplying AC power and a vehicle 20 charging using DC power by moving according to the user's needs.

[0050] The bidirectional charging interfaces 110 and 120 include: a first charging interface 110 located on one side and electrically connected to an external AC charger 10; and a second charging interface 120 located on the other side and electrically connected to an external vehicle 20.

[0051] The first charging interface 110 includes: an inlet plug 111, which is connected to the charging connector 11 of the AC charger 10 to connect to charging communication; a proximity detection (PD) module 112, which detects that the charging connector 11 of the AC charger 10 is connected (coupled) to the inlet plug 111; and a control pilot (CP) input module 113, which performs low-level communication with the AC charger 10 based on pulse width modulation (PWM) when charging communication is connected.

[0052] For example, the inlet plug 111 has an inlet configuration of a corresponding type (e.g., Type 1) depending on the type of the charging connector 11 of the AC charger 10 (e.g., AC Type 1). That is, the inlet plug 111 can be set with various compatible inlet configurations depending on the type of the charging connector 11 of the AC charger 10.

[0053] The PD module 112 detects whether the inlet plug 111 and the charging connector 11 of the AC charger 10 are connected, and transmits the PD signal to the controller 150 in response to the connection detection.

[0054] The CP input module 113 receives the CP signal from the AC charger 10 and transmits the CP signal to the controller 150.

[0055] The second charging interface 120 includes: a cable connector 121, connected to the charging plug of the vehicle 20 for charging communication; a power line communication (PLC) modem 122 for performing advanced communication with the vehicle 20; and a CP output module 123, which is required for advanced communication with the PLC modem 122. In other words, the second charging interface 120 is capable of AC / DC charging with the vehicle 20 based on advanced communication.

[0056] The PLC modem 122 can support advanced communication with vehicle 20 based on the international standard for electric vehicle charging, DIN 70121 or ISO 15118.

[0057] When the power switch Q3, used for power activation within the device, is activated, the SMPS130 supplies power. In this case, the SMPS130 includes a regulator 160 that maintains the power at a constant voltage required for the operation of the components within the device.

[0058] The power switch Q3 can be configured as a push-pull switch and operated by the user on / off.

[0059] In the above description, the first charging interface 110 and the second charging interface 120 have been described as being respectively configured with an inlet plug 111 and a cable connector 121. However, the embodiments of this disclosure are not limited thereto, and the first charging interface 110 and the second charging interface 120 may be configured with corresponding inlet plugs or cable connectors depending on the cable connection structure (connector / inlet) of the AC charger 10 and the vehicle 20.

[0060] The AC / DC converter 140 is connected at its input end to the inlet plug 111 of the first charging interface 110 via an AC line 141, and at its output end to the cable connector 121 of the second charging interface 120 via a DC line 142.

[0061] AC line 141 includes an L1 line and an N line, and is used to input AC power to AC / DC converter 140.

[0062] DC line 142 includes a DC+ line and a DC- line, and uses the DC+ line and DC- line to output DC power converted by AC / DC converter 140.

[0063] The first relay Q1 and the second relay Q2 are respectively installed on the DC+ line and DC- line of DC line 142 to transmit (ON) or block (OFF) the DC power output to vehicle 20.

[0064] The first relay Q1 and the second relay Q2 can be controlled to operate ON / OFF by a switch. For example, the first relay Q1 and the second relay Q2 can be turned on and operated in the closed state during vehicle charging control, and can be turned off and operated in the OFF state when charging is not in progress (e.g., before charging begins / after charging is completed).

[0065] The AC / DC converter 140 can convert input AC power into high-voltage DC power and output high-voltage DC power.

[0066] The controller 150 controls the overall operation of the mobile power conversion device 100 and includes at least one program and data for this control. That is, the controller 150 is configured by a combination of hardware (HW) and software (SW) for vehicle charging control.

[0067] The controller 150 can perform vehicle charging control based on status information collected from outside or inside the device, and can monitor status information or control results and output status information or control results through the display unit 170. For example, the display unit 170 includes: a ready light 171, indicating the power activation status inside the device; a charging light 172, indicating whether charging is ON or OFF; and a fault light 173, indicating that an abnormality has occurred inside the device.

[0068] The controller 150 may be implemented as one or more processors that operate according to a setup program, and the setup program may be programmed to perform each step in the control method for a mobile power conversion device for charging an electric vehicle according to embodiments of the present disclosure.

[0069] The control method of the mobile power conversion device for charging electric vehicles will now be described in more detail with reference to the accompanying drawings.

[0070] Figure 3 and Figure 4 A flowchart illustrating a control method for a mobile power conversion device for charging an electric vehicle according to an embodiment of the present disclosure is shown schematically.

[0071] Reference Figure 3 and Figure 4 The control method for a mobile power conversion device for charging an electric vehicle according to an embodiment of the present disclosure includes step (S110), in which a user connects the charging connector 11 of the AC charger 10 to the first charging port 110 of the mobile power conversion device 100 and turns on the power switch Q3 to activate the power inside the device. In this case, the charging plug of the vehicle 20 can be connected to the second charging port 120.

[0072] The mobile power conversion device 100 determines whether the power supply (SMPS) 130 and controller 150 within the device are operating (ON) (S120).

[0073] For example, if the power supply 130 is activated (ON) through the connection of the charging connector 11 of the AC charger 10 and the ON state of the power switch Q3, thereby supplying power to the inside of the device, and the controller 150 is activated (ON) by this power (S120: Yes), the mobile power conversion device 100 prepares for vehicle charging. In this case, the controller 150 can illuminate the ready light 171 of the display unit 170 to indicate the power activation status inside the device (ready light ON).

[0074] In other words, when the user connects the AC charger 10 and the vehicle 20 to the first charging port 110 and the second charging port 120 respectively, the controller 150 is activated by turning the power switch Q3 ON. Furthermore, when preparing to charge the vehicle, the controller 150 checks whether the electrical (charging communication) connection status of the bidirectional charging ports 110 and 120, which will be described later, is normal.

[0075] In the following text, the control method (process) of the mobile power conversion device 100 can be described with the controller 150 as the main body, and the controller 150 controls the overall operation of the device.

[0076] The controller 150 collects the CP PWM signal of the AC charger 10 through the first charging interface 110 (S130), and determines whether a normal connection has been established by comparing the CP state and PD voltage with their respective reference values ​​(S140). The reference values ​​can be set based on international standards for electric vehicle charging.

[0077] For example, controller 150 compares whether the CP voltage meets a first reference value (e.g., 6V) and whether the PD voltage meets a second reference value (e.g., 1.5V). If at least one of the corresponding reference values ​​is not met (S140: No), an abnormal connection state is determined, and the process returns to step S110. In this case, controller 150 illuminates the fault light 173 on display unit 170 to indicate an abnormality within the device (fault light ON). This prompts the user to check the connection status and / or reconnect, or to confirm that the use complies with normal specifications (e.g., international standards for electric vehicle charging).

[0078] On the other hand, if the CP voltage meets the first reference value and the PD voltage meets the second reference value (S140: Yes), the controller 150 will operate the second switch SW2 located on the first charging interface 110 side to the ON state (S150). Therefore, normal charging communication with the AC charger 10 side is established.

[0079] On the other hand, when a CP±12V PWM is generated from the AC charger 10 side and the first switch SW1 located on the second charging interface 120 side is operated to the ON state (S160), the controller 150 operates the PLC modem 122 (ON) and connects to the vehicle 20 via the second charging interface 120 for advanced communication (S170). In this case, the controller 150 can connect to the vehicle 20 via the PLC modem 122 for advanced communication based on DIN 70121 or ISO 15118. That is, the controller 150 connects the AC charger 10, which can only supply AC power, and the vehicle 20, which can only charge DC power, for mutual charging communication, thereby enabling vehicle charging according to international standards for electric vehicle charging (e.g., ISO 15118-2). Thus, the controller 150 can transmit at least one type of charging information between the vehicle 20 and the AC charger 10, such as the high-voltage battery charging capacity, state of charge (SoC), target charge amount, and charging time.

[0080] The controller 150, having completed vehicle charging preparation as described above, initiates vehicle charging control, which will be described later.

[0081] The controller 150 operates both the first relay Q1 and the second relay Q2 installed in the AC / DC converter 140 and the DC line 142 to ON (S180). In this case, actual vehicle charging is started, and the controller 150 can illuminate the charging light 172 on the display unit 170 to indicate the vehicle charging status (charging light ON).

[0082] The controller 150 performs vehicle charging control to convert the AC power input from the AC charger 10 into DC power via the AC / DC converter 140 and supply the DC power to the vehicle 20 (S190).

[0083] The controller 150 performs vehicle charging control for a set target charging amount and / or charging time, and monitors whether charging of the external AC charger 10 has terminated (S200), charging of the vehicle 20 has terminated (S210), and whether an internal fault has occurred (S220). For example, the termination of charging of the AC charger 10 and the vehicle 20 can be input by the user through operation of the respective devices. An internal fault may occur when overvoltage / overcurrent, circuit / wire short circuit, etc., are identified in the device due to self-diagnosis.

[0084] When one of the following is input during vehicle charging control: charging termination of external AC charger 10, charging termination of vehicle 20, or occurrence of an internal fault (S200, S210, or S220: Yes), controller 150 disconnects AC / DC converter 140 and first relay Q1 and second relay Q2 to terminate vehicle charging (S230). In this case, controller 150 turns off charging light 172 on display unit 170 to indicate vehicle charging termination status (charging light OFF). However, when an internal fault is detected (S220: Yes), fault light 173 can be illuminated to further indicate the internal fault status (fault light ON).

[0085] Subsequently, the controller 150 can terminate vehicle charging by disconnecting all switches SW2 and SW1 located on the first charging interface 110 and the second charging interface 120 according to the charging termination sequence (S240).

[0086] On the other hand, when the controller 150 completes vehicle charging control for the set target charging amount and / or charging time during vehicle charging control without any abnormalities (S200, S210 and S220: No), the controller 150 normally executes steps S230 and S240, and then terminates vehicle charging.

[0087] As described above, according to embodiments of the present disclosure, a mobile power conversion device is provided that connects an AC charger capable only of supplying AC power to a vehicle without an OBC via a bidirectional communication interface, and provides a smooth vehicle charging function through AC-DC power conversion, thereby enabling vehicles capable only of DC charging to use an AC charger anywhere.

[0088] In addition, it has the effect of increasing driving range (electric efficiency) by reducing costs and vehicle weight by eliminating the OBC and related high-voltage cables installed in traditional vehicles.

[0089] Furthermore, it enables advanced communication-based charging communication between vehicles without an On-Board Charger (OBC) via a mobile power conversion device. Therefore, it allows for the transmission and reception of data required for various electric vehicle charging-related application services (e.g., charging start and end, communication channel setup, billing and payment, authentication and security, charging control and scheduling, vehicle ancillary services, etc.) based on advanced communication.

[0090] The methods and apparatus described above are not only implemented through embodiments of this disclosure, but are also intended to be implemented through programs for implementing functions corresponding to the configurations of embodiments of this disclosure, or through non-transitory recording media for recording such programs.

[0091] While this disclosure has been described in conjunction with embodiments now considered practical, it will be understood that this disclosure is not limited to the disclosed embodiments, but rather, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A mobile power conversion device for electric vehicle charging, comprising: a first charging interface electrically connected to an external alternating current charger, i.e., AC charger, at a first side; a second charging interface electrically connected to an external vehicle, which does not have an on-board charger, i.e., OBC, at a second side; a switch mode power supply, i.e., SMPS, supplying power to an inside of the mobile power conversion device; an alternating current / direct current converter, i.e., AC / DC converter, converting AC power input from the AC charger into direct current power, i.e., DC power, which is capable of charging a high voltage battery of the vehicle; and a controller performing vehicle charging control by supplying the DC power converted by the AC / DC converter to the vehicle.

2. The mobile power conversion device for electric vehicle charging according to claim 1, wherein the first charging interface includes: an inlet plug connected to a charging connector of the AC charger to connect charging communication; a proximity detection module, i.e., PD module, detecting that the charging connector of the AC charger is connected to the inlet plug; and a control pilot input module, i.e., CP input module, performing pulse width modulation, i.e., PWM, based low level communication with the AC charger when the charging communication is connected.

3. The mobile power conversion device for electric vehicle charging according to claim 1, wherein the second charging interface includes: a cable connector connected to a charging plug of the vehicle to connect charging communication; a power line communication modem, i.e., PLC modem, performing high level communication with the vehicle; and a control pilot output module, i.e., CP output module, which is required for high level communication of the PLC modem.

4. The mobile power conversion device for electric vehicle charging according to claim 3, wherein the PLC modem supports high level communication with the vehicle based on electric vehicle charging international standard DIN 70121 or ISO 15118.

5. The mobile power conversion device for electric vehicle charging according to claim 1, wherein the SMPS supplies power when a power switch Q3 for power activation inside the mobile power conversion device is operated, and the SMPS includes a regulator maintaining power at a constant voltage required for operation of components inside the mobile power conversion device.

6. The mobile power conversion device for electric vehicle charging according to claim 5, wherein the power switch Q3 is a push-pull switch and is operated ON / OFF by a user. the AC / DC converter:

7. The mobile power conversion apparatus for electric vehicle charging of claim 1, wherein, is connected to the inlet plug of the first charging interface by an AC line at an input side, and is connected to the cable connector of the second charging interface by a DC line at an output side.

8. The mobile power conversion device for electric vehicle charging according to claim 7, wherein the AC line includes an L1 line and an N line, and the L1 line and the N line are used to input AC power to the AC / DC converter, and the DC line includes a positive line and a negative line, and the positive line and the negative line are used to output DC power from the AC / DC converter. The DC lines include a DC+ line and a DC- line, and the DC+ line and the DC- line are used to output DC power converted from the AC / DC converter.

9. The mobile power conversion device for electric vehicle charging according to claim 8, wherein, First and second relays Q1 and Q2 are installed on DC+ and DC- lines of the DC lines, respectively, to transmit or block the DC power to the vehicle.

10. The mobile power conversion apparatus for electric vehicle charging of claim 1, wherein, The controller further: performs the vehicle charging control based on state information collected from the outside or the inside of the mobile power conversion device; monitors the state information or a control result; and outputs the state information or the control result through a display section.

11. The mobile power conversion apparatus for electric vehicle charging of claim 10, wherein, The controller includes: a ready light indicating a power activation state inside the mobile power conversion device; a charging light indicating ON / OFF of vehicle charging; and a fault light indicating an abnormal situation inside the mobile power conversion device.

12. A control method of a mobile power conversion device for electric vehicle charging, the control method of the mobile power conversion device for electric vehicle charging comprising: connecting an external alternating current (AC) charger and a vehicle, which has no on-board charger (OBC), to first and second charging interfaces, respectively; activating power inside the mobile power conversion device by turning on a power switch (Q3); checking whether an electrical connection state of the first and second charging interfaces is normal to prepare for vehicle charging; when the electrical connection state is normal, operating first and second relays (Q1 and Q2) installed on an alternating current / direct current (AC / DC) converter and direct current (DC) lines to ON, respectively; and performing vehicle charging control by converting AC power input from the AC charger into DC power through the AC / DC converter and supplying the DC power to the vehicle. The checking whether the electrical connection state is normal includes:

13. The control method of the mobile power conversion device according to claim 12, wherein, collecting a control pilot (CP) pulse width modulation (PWM) signal of the AC charger through the first charging interface; determining whether the connection is normal by comparing a CP state and a proximity detection (PD) voltage with respective reference values; determining an abnormal connection state when at least one of the CP state and the PD voltage does not satisfy the corresponding reference value; in response to the determination of the abnormal connection state, indicating an abnormal situation inside the mobile power conversion device by lighting a fault light of a display section; and when both the CP state and the PD voltage satisfy the corresponding reference values, operating a second switch (SW2) located at the first charging interface side to ON. The checking whether the electrical connection state is normal includes:

14. The control method of the mobile power conversion device according to claim 12, wherein, generating a control pilot ±12V pulse width modulation (CP ±12V PWM) signal from the AC charger side; turning on a first switch (SW1) located at the second charging interface side; turning on a power line communication (PLC) modem; and connecting advanced communication with the vehicle through the second charging interface. The performing the vehicle charging control includes indicating a vehicle charging state by lighting a charging light of a display section.

15. The control method of the mobile power conversion device according to claim 12, wherein, ​ 16. The control method of a mobile power conversion device according to claim 12, further comprising, after performing the vehicle charging control: inputting one of a charging termination of the AC charger, a charging termination of the vehicle, and an occurrence of an internal fault during the vehicle charging control; and terminating the vehicle charging by turning off the AC / DC converter and the first relay Ql and the second relay Q2.

17. The control method of a mobile power conversion device according to claim 16, wherein terminating the vehicle charging includes indicating a vehicle charging termination state by turning off a charging lamp of a display section, and when the internal fault occurs, a fault lamp of the display section is lit to further indicate an internal fault state.

18. A non-transitory computer readable medium storing instructions that, when executed by one or more processors of a controller of a mobile power conversion device, cause the one or more processors to: determine that an external alternating current (AC) charger is connected to a first charging interface of the mobile power conversion device; determine that a vehicle is connected to a second charging interface of the mobile power conversion device, the vehicle having no on-board charger (OBC); activate power inside the mobile power conversion device by turning on a power switch Q3; check whether an electrical connection state of the first charging interface and the second charging interface is normal for vehicle charging preparation; when the electrical connection state is normal, operate an alternating current / direct current (AC / DC) converter and first and second relays Ql and Q2 installed on a direct current (DC) line to ON; and perform vehicle charging control by converting AC power input from the AC charger into DC power by the AC / DC converter and supplying the DC power to the vehicle. To check whether the electrical connection state is normal, the instructions executed by the one or more processors further cause the one or more processors to:

19. The non-transitory computer-readable medium of claim 18, wherein, collect a control pilot pulse width modulation (PWM) signal (CP PWM signal) of the AC charger through the first charging interface; determine whether the connection is normal by comparing a CP state and a proximity detection (PD) voltage with respective reference values; determine an abnormal connection state when at least one of the CP state and the PD voltage does not satisfy the respective reference value; in response to determining the abnormal connection state, indicate that an abnormal situation has occurred inside the mobile power conversion device by lighting a fault lamp of a display section; and when both the CP state and the PD voltage satisfy the respective reference values, operate a second switch SW2 located on the first charging interface side to ON. To check whether the electrical connection state is normal, the instructions executed by the one or more processors further cause the one or more processors to: generate a control pilot ±12V pulse width modulation (PWM) signal (CP ±12V PWM signal) from the AC charger side; 20. The non-transitory computer-readable medium of claim 18, wherein, turn on a first switch SWl located on the second charging interface side; turn on a power line communication (PLC) modem; and ​ ​ Connect with the vehicle through the second charging interface for advanced communication.

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