Electric vehicle charging apparatus capable of supplying current to home load

Abstract

The present invention relates to an electric vehicle charging apparatus capable of supplying current to a home load. The electric vehicle charging apparatus according to the present invention comprises: an AC input terminal connected to a power supply unit; a grid switching unit for connecting or disconnecting the output of the AC input terminal; an EV switching unit for connecting or disconnecting the output of the grid switching unit; an AC output terminal to which the output of the EV switching unit is connected; and a control unit for controlling the grid switching unit and the EV switching unit, wherein the output of the grid switching unit may be connected in parallel to a home load. According to the present invention, when the battery of the electric vehicle is sufficiently charged and an abnormality occurs in the power supply unit, the current can be automatically supplied to the home load even if the user does not manually disconnect the connection with the power supply unit.

Description

Electric vehicle charging device capable of supplying current to household loads

[0001] The present invention relates to an electric vehicle charging device capable of supplying current to a household load. More specifically, it relates to an electric vehicle charging device capable of automatically supplying current to a household load by utilizing power from a battery inside the electric vehicle in the event of a power outage.

[0002] The use of petroleum fuels in automobiles is increasing carbon dioxide emissions, and as the resulting global warming persists, abnormal climate phenomena are occurring. Accordingly, research on eco-friendly vehicle technologies to reduce carbon dioxide emissions is being actively conducted.

[0003] As an example of such eco-friendly vehicles, electric vehicles (EVs) powered by batteries and electric motors have been commercialized, and research and development regarding them are also continuously underway.

[0004] Electric vehicles are equipped with large-capacity batteries that can be charged with external power, and in the event that the output of the power supply unit is abnormal due to a power outage or other reasons, current can be supplied to household loads using the battery mounted on the vehicle.

[0005] However, conventional electric vehicle charging devices have a problem in that they only operate normally if the user manually disconnects the connection to the power supply unit in order to supply current to a household load using the battery inside the electric vehicle.

[0006] Figure 1 is a drawing illustrating a conventional electric vehicle charging device.

[0007] Referring to FIG. 1, the charging device (100) receives AC current through the AC input terminal (110) which is output from the power supply unit (500) and connected through the first switch (511). The input AC current is output to the AC output terminal (120) of the charging device (100) via the EV switching unit (193).

[0008] At this time, the output current of the first switch (511) is connected to the household load (600) via the second switch (611).

[0009] The first switch (511) and the second switch (611) can be connected or disconnected by the user.

[0010] The AC output terminal (120) can be connected to the AC input terminal (210) of the AC electric vehicle (200). The AC current applied through the AC input terminal (210) is converted into DC current by the OBC (On Board Charger, 230) equipped in the AC electric vehicle (200), and then can charge the battery (280) through the connection part (260).

[0011] Since the OBC (230) is capable of bidirectional operation, it can not only convert AC current into DC current and supply it to the battery (280), but also convert the DC current output from the battery (280) into AC current and supply it to the charging device (100).

[0012] At this time, in order to supply current to a household load (600) using the battery (280) of the AC electric vehicle (200), the user must manually disconnect the connection with the power supply unit (500), so the first switch (511) must be switched to the disconnection mode. However, since the AC electric vehicle (200) and the charging device (100) cannot detect the connection or disconnection status of the first switch (511), there is a risk of an accident occurring if the OBC (230) operates while connected to the power supply unit (500) during a power outage.

[0013] Therefore, the development of technology capable of resolving inconveniences and the possibility of accidents arising from user operation is required.

[0014] The technical problem that the present invention aims to solve is to provide an electric vehicle charging device capable of automatically utilizing battery power inside the electric vehicle to supply current to a household load, even when the user does not manually disconnect the connection with the power supply unit in the event of a power outage.

[0015] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.

[0016] An electric vehicle charging device capable of supplying current to a household load according to the present invention for solving the above technical problem comprises an AC input terminal connected to a power supply unit, a grid switching unit that connects or disconnects the output of the AC input terminal, an EV switching unit that connects or disconnects the output of the grid switching unit, an AC output terminal to which the output of the EV switching unit is connected, and a control unit that controls the grid switching unit and the EV switching unit, wherein the output of the grid switching unit can be connected in parallel with a household load.

[0017] In some embodiments of the present invention, the control unit may turn on the grid switching unit when the output of the power supply unit is normal.

[0018] In some embodiments of the present invention, the control unit can turn on the EV switching unit when connected to an AC electric vehicle.

[0019] In some embodiments of the present invention, the control unit may turn off the grid switching unit when the output of the power supply unit is abnormal.

[0020] In some embodiments of the present invention, the control unit may turn on the EV switching unit when the charge amount of the battery of the connected AC electric vehicle is greater than or equal to a predetermined value.

[0021] In some embodiments of the present invention, a grid switch may be included between the AC input terminal and the grid switching unit.

[0022] In some embodiments of the present invention, a load switch may be included between the grid switching unit and the load connection unit.

[0023] In some embodiments of the present invention, a DC charging device may further include an AC input terminal connected to the AC output terminal, a bidirectional AC-DC converter that converts the AC input into a DC output, and a DC output terminal to which the output of the AC-DC converter is connected.

[0024] In some embodiments of the present invention, the control unit may turn on the grid switching unit when the output of the power supply unit is normal, and turn on the EV switching unit when connected to the DC charging device.

[0025] In some embodiments of the present invention, the control unit may turn off the grid switching unit when the output of the power supply unit is abnormal, and turn on the EV switching unit when the output of the DC charging unit is connected to the DC charging unit and the output of the DC charging unit is connected to the DC electric vehicle and the charge amount of the battery of the DC electric vehicle is greater than or equal to a predetermined value.

[0026] According to the electric vehicle charging device capable of supplying current to a household load of the present invention, when the battery of the electric vehicle is sufficiently charged and an abnormality occurs in the power supply unit, current can be automatically supplied to the household load without the user having to manually disconnect the connection with the power supply unit. In particular, since current is supplied to the household load by determining the charge level of the battery inside the electric vehicle and the power outage, accidents caused by user error can be prevented, thereby providing a safer charging device.

[0027] Figure 1 is a drawing illustrating a conventional electric vehicle charging device.

[0028] FIG. 2 is a drawing illustrating an electric vehicle charging device according to one embodiment of the present invention.

[0029] FIG. 3 is a flowchart showing the operation of a control unit of an electric vehicle charging device according to one embodiment of the present invention.

[0030] FIG. 4 is a diagram showing the control of a switching unit of an electric vehicle charging device according to one embodiment of the present invention.

[0031] FIG. 5 is a drawing illustrating an electric vehicle charging device according to another embodiment of the present invention.

[0032] FIG. 6 is a flowchart showing the operation of a control unit of an electric vehicle charging device according to another embodiment of the present invention.

[0033] FIG. 7 is a diagram showing an example of a pin arrangement of an electric vehicle charging device employed in an embodiment of the present invention.

[0034] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0035] "And / or" includes each of the mentioned items and all combinations of one or more.

[0036] The terms used herein are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprising" and / or "comprising" does not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0037] Furthermore, throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly" or "electrically connected" with other members or elements in between.

[0038] Additionally, throughout the specification, the description that each layer (film), region, pattern, or structure is formed "on" or "under" the substrate, each layer (film), region, pad, or pattern includes both direct formation and formation through another layer. The criteria for "on" or "under" each layer are described based on the drawings.

[0039] Furthermore, expressions such as 'first, second,' etc., are used solely to distinguish multiple compositions and do not limit the order or other characteristics between the compositions.

[0040] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0041] Hereinafter, an electric vehicle charging device capable of supplying current to a household load according to the present invention will be described with reference to the drawings.

[0042] FIG. 2 is a drawing illustrating an electric vehicle charging device according to one embodiment of the present invention.

[0043] Referring to FIG. 2, an electric vehicle charging device according to one embodiment of the present invention is an electric vehicle charging device connected to a power supply unit (500) and a household load (600), and receives an AC current output from the power supply unit (500) and applied through a first switch (511) through an AC input terminal (110), and can be connected to a household load (600) through a load connection terminal (113).

[0044] At this time, the output current of the load connection terminal (113) is supplied to the household load (600) through the second switch (611).

[0045] The first switch (511) and the second switch (611) can be connected or disconnected by the user.

[0046] A charging device (100) according to the present invention comprises an AC input terminal (110) connected to a power supply unit (500), a grid switching unit (191) that connects or disconnects the output of the AC input terminal (110), an EV switching unit (193) that connects or disconnects the output of the grid switching unit (191), an AC output terminal (120) connected to the output side of the EV switching unit (193), and a control unit (170) that controls the grid switching unit (191) and the EV switching unit (193), and the output of the grid switching unit (191) can be connected in parallel to a household load (600).

[0047] The grid switching unit (191) can connect or disconnect the output of the power supply unit (500) to both the AC electric vehicle (200) and the household load (600), and the EV switching unit (193) can connect or disconnect the output of the grid switching unit (191) to the AC electric vehicle (200).

[0048] The AC current output to the AC output terminal (120) via the EV switching unit (193) can be supplied to the AC input terminal (210) of the AC electric vehicle (200). The AC current input through the AC input terminal (210) is converted into DC current by the OBC (On Board Charger, 230) equipped in the AC electric vehicle (200), and then charges the battery (280) via the connection unit (260).

[0049] Since the OBC (230) is capable of bidirectional operation, it can not only convert AC current into DC current and supply it to the battery (280), but also convert the DC current output from the battery (280) into AC current and supply it to the charging device (100).

[0050] The charging device (100) according to the present invention may include a grid switch (181) between the AC input terminal (110) and the grid switching unit (191). It may also include a load switch (183) between the grid switching unit (191) and the load connection terminal (113). The grid switch (181) and the load switch (183) can be connected or disconnected by the user.

[0051] Since the grid switch (181) and the load switch (183) may have functions that overlap with the first switch (511) and the second switch (611), respectively, they may not be included depending on the embodiment.

[0052] The components of an electric vehicle charging device may vary depending on the electrical regulations, standards, and criteria of each country. Therefore, when the device of the present invention is applied to an environment where the first switch (511) and the second switch (611) are already installed, the grid switch (181) and the load switch (183) may not need to be provided separately.

[0053] When the output of the power supply unit (500) is normal, it can operate as follows.

[0054] The AC current supplied from the power supply unit (500) through the AC input terminal (110) can be applied to the EV switching unit (193) and the load switch (183) after passing through the grid switch (181) that the user has switched to a connected state and the grid switching unit (191) that is turned ON by the control unit (170).

[0055] When the AC electric vehicle (200) is connected, the control unit (170) turns on the EV switching unit (193) and outputs an AC current for charging the battery (280) through the AC output terminal (120).

[0056] At the same time, the AC current can be output to the load connection terminal (113) via the load switch (183) that the user has switched to a connected state and supplied to the household load (600).

[0057] In this way, the control unit (170) according to the present invention can control the grid switching unit (191) to the ON state when the output of the power supply unit (500) is normal.

[0058] At this time, when the control unit (170) determines that the AC electric vehicle (200) is connected, it can control the EV switching unit (193) to the ON state.

[0059] If the output of the power supply unit (500) is abnormal, it can operate as follows.

[0060] If the output of the power supply unit (500) is determined to be abnormal, the control unit (170) controls the grid switching unit (191) to an OFF state to cut off the output of the power supply unit (500) from the AC electric vehicle (200) and the household load (600). Accordingly, the EV switching unit (193) and the load switch (183) are electrically disconnected from the power supply unit (500).

[0061] In this state, when the AC electric vehicle (200) is connected, the DC current output from the battery (280) is converted into AC current by the OBC (230) and output through the AC input terminal (210). The charging device (100) receives the AC current through the AC output terminal (120), and the AC output terminal (120) operates as an input path to supply power to a household load (600).

[0062] The control unit (170) can control the EV switching unit (193) to the ON state, and the AC current supplied through the AC output terminal (120) is output to the load connection terminal (113) via the EV switching unit (193) and the load switch (183) to which the user has switched to the connection state. Subsequently, the AC current can be supplied to a household load (600) through the second switch (611).

[0063] In this way, the control unit (170) according to the present invention can control the grid switching unit (191) to an OFF state when the output of the power supply unit (500) is abnormal, and can control the EV switching unit (193) to an ON state when the charge amount of the battery (280) of the connected AC electric vehicle (200) is greater than or equal to a predetermined value.

[0064] The above control unit (170) may include a microcontroller and a memory, and can perform control operations of the electric vehicle charging device according to the present invention by a microcontroller that executes a program stored in the memory.

[0065] The control unit (170) checks the input voltage and current of the power supply unit (500) to determine whether the power supply unit (500) can normally charge the AC electric vehicle (200) and supply the power required for the household load (600).

[0066] In addition, when connected to an AC electric vehicle (200), communication with the vehicle's control unit (270) can be performed to check whether the charging capacity of the battery (280) is sufficient to supply the power required by the household load (600).

[0067] The control unit (170) can appropriately control each switching unit of the charging device (100) by recognizing whether the power supply unit (500) is operating normally, the connection status of the AC electric vehicle (200), and the amount of charge.

[0068] The above switching unit may be configured, for example, as a relay switch. The relay switch maintains a set cut-off state or connected state before a driving signal from the control unit is applied, and the switch state may be switched when a driving signal is applied.

[0069] FIG. 3 is a flowchart showing the operation of a control unit of an electric vehicle charging device according to an embodiment of the present invention, and FIG. 4 is a diagram showing the control state of a switching unit.

[0070] The switching operation of the present invention will be explained with reference to FIGS. 3 and FIGS. 4.

[0071] A control unit (170) according to one embodiment of the present invention can control switching units (191, 193) so that when the output of the power supply unit (500) is normal and the AC electric vehicle (200) is connected, the power supplied from the power supply unit (500) is applied to the household load (600) and the AC electric vehicle (200), respectively. That is, both the grid switching unit (191) and the EV switching unit (193) can be controlled to the ON state.

[0072] The control unit (170) can control the switching unit (191, 193) so that when the output of the power supply unit (500) is normal and the AC electric vehicle (200) is not connected, the power supplied from the power supply unit (500) is applied only to the household load (600). That is, the grid switching unit (191) can be controlled to the ON state and the EV switching unit (193) can be controlled to the OFF state.

[0073] Additionally, when the output of the power supply unit (500) is abnormal and the AC electric vehicle (200) is connected, and at the same time the charge amount of the battery (280) is above a predetermined level, the switching unit (191, 193) can be controlled so that the power supplied from the battery (280) of the AC electric vehicle (200) is applied to the household load (600). That is, the grid switching unit (191) can be controlled to an OFF state and the EV switching unit (193) can be controlled to an ON state.

[0074] At this time, the above-mentioned predetermined level can be set to a level at which the AC electric vehicle (200) can travel a certain distance or more. For example, by setting it to supply power to a household load only when the battery charge is 30% or more, it is possible to control the charge so that it does not decrease to less than 30%.

[0075] The control unit (170) can control each switching unit (191, 193) to be cut off if the output of the power supply unit (500) is abnormal and the AC electric vehicle (200) is not connected, or even if it is connected, the charge amount of the battery (280) is below a predetermined level. That is, the grid switching unit (191) and the EV switching unit (193) can both be controlled to be in an OFF state.

[0076] As such, the electric vehicle charging device of the present invention can supply battery power to a household load only when the power supply is abnormal and the battery charge of the AC electric vehicle is greater than or equal to a predetermined value. In particular, even if the user does not manually disconnect the connection with the power supply unit, it can automatically supply current to the household load by determining the battery charge and whether there is a power outage.

[0077] In particular, accidents that may occur when the OBC (230) of the AC electric vehicle (200) operates while connected to the power supply unit during a power outage can be prevented.

[0078] FIG. 5 is a drawing illustrating an electric vehicle charging device according to another embodiment of the present invention.

[0079] Referring to FIG. 5, an electric vehicle charging device according to another embodiment may additionally include a DC charging device (300) in addition to the charging device (100) described above.

[0080] The above DC charging device (300) may include an AC input terminal (310) connected to an AC output terminal (120) of the charging device (100), a bidirectional AC-DC converter (330) that converts the AC input into a DC output, and a DC output terminal (320) to which the output of the AC-DC converter (330) is connected.

[0081] That is, the DC charging device (300) is connected in series to the rear end of the charging device (100), and a DC electric vehicle (400) can be connected to the DC output terminal (320). Accordingly, not only can the DC electric vehicle (400) be charged, but power can also be supplied to a household load (600) using the current output from the battery (480) of the DC electric vehicle (400).

[0082] The grid switching unit (191) of the charging device (100) can selectively connect or disconnect the output of the power supply unit (500) to the DC charging device (300) and the household load (600), and the EV switching unit (193) can selectively connect or disconnect the output of the grid switching unit (191) to the DC charging device (300).

[0083] The AC current output to the AC output terminal (120) via the EV switching unit (193) can be applied to the AC input terminal (310) of the DC charging device (300). The AC current input through the AC input terminal (310) is converted into a DC current in the AC-DC converter (330) capable of bidirectional operation, and then output to the DC output terminal (320) via the DC switching unit (393). The output of the DC output terminal (320) is applied to the DC input terminal (420) of the DC electric vehicle (400), and the input DC current can charge the battery (480) through the connection unit (460).

[0084] In addition, since the AC-DC converter (330) can operate in both directions, it can not only convert AC current into DC current and output it to the DC switching unit (393), but also convert DC current output from the battery (480) of the DC electric vehicle (400) into AC current and supply it to the charging device (100).

[0085] When the output of the power supply unit (500) is normal, it can operate as follows.

[0086] The AC current supplied from the power supply unit (500) through the AC input terminal (110) can be applied to the EV switching unit (193) and the load switch (183) after passing through the grid switch (181) that the user has switched to a connected state and the grid switching unit (191) that is turned ON by the control unit (170).

[0087] When the DC charging device (300) is connected, the control unit (170) controls the EV switching unit (193) to the ON state, and accordingly, the AC current output to the AC output terminal (120) is applied to the AC input terminal (310) of the DC charging device (300). The AC current is converted into a DC current in the AC-DC converter (330) and then applied to the DC input terminal (420) of the DC electric vehicle (400) through the DC output terminal (320) to supply charging power to the battery (480).

[0088] At the same time, the AC current can be output to the load connection terminal (113) via the load switch (183) that the user has switched to a connected state and supplied to the household load (600).

[0089] In this way, the control unit (170) can control the grid switching unit (191) to an ON state when the output of the power supply unit (500) is normal, and can control the EV switching unit (193) to an ON state when the DC charging device (300) is connected.

[0090] If the output of the power supply unit (500) is abnormal, it can operate as follows.

[0091] If the output of the power supply unit (500) is determined to be abnormal, the control unit (170) controls the grid switching unit (191) to an OFF state to cut off the output of the power supply unit (500). Accordingly, the EV switching unit (193) and the load switch (183) are electrically disconnected from the power supply unit (500).

[0092] In this state, when the DC charging device (300) is connected, the DC current output from the battery (480) of the DC electric vehicle (400) is output through the DC input terminal (420) and can be applied to the DC output terminal (320) of the DC charging device (300). Subsequently, the AC-DC converter (330) converts the DC current into an AC current and outputs it through the AC input terminal (310), and the converted AC current is supplied to the AC output terminal (120) of the charging device (100) to supply power to the household load (600). At this time, the DC output terminal (320) can function as an input path for supplying power to the household load (600).

[0093] The control unit (170) can control the EV switching unit (193) to the ON state, and the AC current supplied through the AC output terminal (120) is output to the load connection terminal (113) via the EV switching unit (193) and the load switch (183) to which the user has switched to the connection state. Subsequently, the AC current can be supplied to a household load (600) through the second switch (611).

[0094] In this way, the control unit (170) can control the grid switching unit (191) to an OFF state when the output of the power supply unit (500) is abnormal, and can control the EV switching unit (193) to an ON state when the charge amount of the battery (480) of the connected DC electric vehicle (400) is greater than or equal to a predetermined value.

[0095] The above control unit (170) may include a microcontroller and a memory, and can perform control operations of the electric vehicle charging device according to the present invention by a microcontroller that executes a program stored in the memory.

[0096] The control unit (170) checks the input voltage and current of the power supply unit (500) and can determine whether the power supply unit (500) can normally charge the DC electric vehicle (400) and supply the power required for the household load (600).

[0097] When connected to a DC electric vehicle (400), the control unit (170) can communicate with the DC electric vehicle control unit (470) to check whether the charging capacity of the battery (480) is sufficient to supply the power required by the household load (600).

[0098] The control unit (170) can appropriately control each switching unit of the charging device (100) by comprehensively determining whether the power supply unit (500) is operating normally, the connection status of the DC electric vehicle (400), and the battery charge amount.

[0099] FIG. 6 is a flowchart showing the operation of a control unit of an electric vehicle charging device according to another embodiment of the present invention.

[0100] With reference to FIG. 6, a switching operation according to another embodiment of the present invention will be described.

[0101] A control unit (170) according to another embodiment of the present invention can control each switching unit (191, 193) so that when the output of the power supply unit (500) is normal and the DC charging device (300) is connected, the power supplied from the power supply unit (500) is applied to the household load (600) and the DC electric vehicle (400). That is, the grid switching unit (191) and the EV switching unit (193) can both be controlled to the ON state.

[0102] The control unit (170) can control each switching unit (191, 193) so that when the output of the power supply unit (500) is normal and not connected to the DC charging device (300), the power supplied from the power supply unit (500) is applied only to the household load (600). That is, the grid switching unit (191) can be controlled to an 'ON' state and the EV switching unit (193) can be controlled to an 'OFF' state.

[0103] Additionally, the control unit (170) can control each switching unit (191, 193) so that power supplied from the battery (480) of the DC electric vehicle (400) is applied to the household load (600) when the output of the power supply unit (500) is abnormal, the DC charging device (300) is connected, the DC electric vehicle (400) is connected to the DC charging device (300), and at the same time the battery (480) of the DC electric vehicle (400) is charged above a predetermined level. That is, the grid switching unit (191) can be controlled to an 'OFF' state and the EV switching unit (193) can be controlled to an 'ON' state.

[0104] At this time, the above-mentioned predetermined level can be set to a charging level that ensures the DC electric vehicle (400) can travel a certain distance. For example, the battery charge amount can be set to 30% so that when the charge amount decreases to 30% or less, the power of the battery (480) of the DC electric vehicle (400) is controlled so that it is no longer discharged.

[0105] The control unit (170) can control each switching unit (191, 193) so that all connections are blocked when the output of the power supply unit (500) is abnormal and is not connected to the DC charging device (300), or even if it is connected to the DC charging device (300), it is not connected to the DC electric vehicle (400), or even if it is connected to the DC electric vehicle (400), the charge amount of the battery (480) is below a predetermined level. That is, the grid switching unit (191) can be turned 'OFF' and the EV switching unit (193) can be controlled to an 'OFF' state.

[0106] In this way, the electric vehicle charging device of the present invention can supply battery power to a household load only when the battery charge amount of the DC electric vehicle is greater than a predetermined value in a situation where the power supply is not normal. In particular, even if the user does not manually disconnect the connection with the power supply unit (500), the control unit (170) can automatically supply power to the household load (600) by determining whether there is a power outage and the charge amount of the internal battery (480) of the DC electric vehicle.

[0107] In particular, reverse current or safety accidents that may occur when the AC-DC converter (330) of the DC charging device (300) operates while connected to the power supply unit (500) during a power outage can be prevented.

[0108] FIG. 7 is a diagram showing an example of a pin arrangement of an electric vehicle charging device employed in an embodiment of the present invention, illustrating a pin arrangement of a charging cable according to the North American Charging Standard (NACS).

[0109] Referring to Fig. 7, the NACS connector is an electric vehicle charging standard developed by Tesla, Inc. and is a widely used charging interface in North America. It is designed with a single port structure that supports both AC current (slow charging) and DC current (fast charging), allowing for both AC and DC charging without changing the port.

[0110] When charging with AC current, 240V single-phase AC power is supplied through the L1 and L2 / N pins, and charging state and current regulation negotiations between the charger and the vehicle are performed using the CP pin, and the grounding of the vehicle and the charger is maintained through the PE pin.

[0111] When charging with DC current, high-voltage DC power is transmitted using the L1, L2 / N pins as DC+ and DC- terminals, the charger and the vehicle negotiate a charging protocol via the CP pin to regulate the power supply, and the PP pin detects whether the connector is inserted.

[0112] The charging device (100) according to the embodiment can be directly connected to an AC electric vehicle (200) by employing a NACS charging cable at the AC output terminal (120), and can also be connected to a DC charging device (300) as needed.

[0113] In addition, the DC charging device (300) according to the embodiment can be connected to a DC electric vehicle (400) by employing a NACS charging cable at the DC output terminal (320).

[0114] That is, by selectively connecting the output of the charging device (100) according to the embodiment to an AC electric vehicle (200) or a DC charging device (300), both the AC electric vehicle (200) and the DC electric vehicle (400) can be charged, and furthermore, the battery power of the electric vehicles (200, 400) can be selectively supplied to a household load (600).

[0115] Although the present invention has been described above, those skilled in the art will recognize that the invention may be implemented in other forms while maintaining the technical concept and essential features of the invention.

[0116] The scope of the present invention shall be defined by the claims, but all modifications or variations derived from configurations directly derived from the descriptions in the claims, as well as configurations equivalent thereto, shall be interpreted as being included within the scope of the present invention.

Claims

1. AC input terminal connected to the power supply; A grid switching unit that connects or disconnects the output of the above AC input terminal; EV switching unit that connects or disconnects the output of the above grid switching unit; AC output terminal to which the output of the above EV switching unit is connected; and It includes a control unit that controls the grid switching unit and the EV switching unit, and An electric vehicle charging device characterized by the output of the grid switching unit being connected in parallel to a household load.

2. In Paragraph 1, The above control unit is an electric vehicle charging device that turns ON a grid switching unit when the output of the above power supply unit is normal.

3. In Paragraph 2, The above control unit is an electric vehicle charging device that turns ON an EV switching unit when connected to an AC electric vehicle.

4. In Paragraph 1, The above control unit is an electric vehicle charging device that turns off the grid switching unit when the output of the power supply unit is abnormal.

5. In Paragraph 4, The above control unit is an electric vehicle charging device that turns on an EV switching unit when the charge amount of the battery of a connected AC electric vehicle is greater than or equal to a predetermined value.

6. In Paragraph 1, An electric vehicle charging device comprising a grid switch between the above AC input terminal and the above grid switching unit.

7. In Paragraph 1, An electric vehicle charging device comprising a load switch between the grid switching unit and the load connection unit.

8. In Paragraph 1, An electric vehicle charging device further comprising an AC input terminal connected to the above AC output terminal, a bidirectional AC-DC converter that converts the AC input into a DC output, and a DC output terminal to which the output of the above AC-DC converter is connected.

9. In Paragraph 8, An electric vehicle charging device, wherein the control unit turns ON the grid switching unit when the output of the power supply unit is normal, and turns ON the EV switching unit when connected to the DC charging device.

10. In Paragraph 8, An electric vehicle charging device, wherein the control unit turns off the grid switching unit when the output of the power supply unit is abnormal, is connected to the DC charging device and the output of the DC charging device is connected to the DC electric vehicle, and turns on the EV switching unit when the charge amount of the battery of the DC electric vehicle is greater than or equal to a predetermined value.

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