Electric vehicle charging device capable of supplying current to home load

Abstract

The present invention relates to an electric vehicle charging device connected to a power supply unit and a home load, and may comprise: a grid switching unit for connecting / disconnecting an output of the power supply unit to / from the home load and an electric vehicle; an EV switching unit for connecting / disconnecting an output of the grid switching unit to / from the EV; and a control unit for controlling each switching 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.

[0002] As carbon dioxide emissions increase due to the use of petroleum-based fuels in automobiles, and as the resulting global warming continues and abnormal climate phenomena occur, extensive research is being conducted on eco-friendly vehicle technologies to reduce carbon dioxide emissions.

[0003] As such eco-friendly vehicles, electric vehicles (EVs) powered by batteries and electric motors have been commercialized, and extensive research and development is underway.

[0004] Since such electric vehicles are equipped with a large-capacity battery and charge it with power, if the output of the power supply unit (GRID, commercial power) is abnormal due to causes such as a power outage, the electric vehicle's battery can be used to supply power to household loads.

[0005] However, in order for currently used electric vehicle charging devices to supply current to a household load using the electric vehicle's battery, the user must manually disconnect the connection between the power supply and the household load for it to operate normally.

[0006] Figure 1 illustrates a conventional AC 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 (300) and connected through the first switch (311). The input AC current passes through the EV switching unit (193) and is output to the AC output terminal (120) of the charging device (100).

[0008] At this time, the output current of the first switch (311) is connected to the household load (500) via the second switch (511).

[0009] The first switch (311) and the second switch (511) 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 electric vehicle. The AC current connected to the AC input terminal (210) can be converted into DC current by the OBC (On Board Charger, 230) built into the electric vehicle and can charge the battery (280) of the electric vehicle (200) through the connection part (260).

[0011] Since the OBC (On Board Charger, 230) can operate in both directions, it can operate by converting AC current into DC current and supplying it to the battery (280), and also by converting the DC current output from the battery (280) into AC current and supplying it to the charging device (100).

[0012] At this time, in order to supply current to a household load (500) using the battery (280) of the electric vehicle (200), the connection between the power supply unit (300) and the charging device must be cut off, so the user must manually switch the first switch (311) to the cut-off mode. However, since the electric vehicle (200) and the charging device (100) cannot check the connection and cut-off status of the first switch (311), there is a possibility that an accident may occur if the OBC (On Board Charger, 230) is operated while connected to the power supply unit (300) during a power outage.

[0013] Another problem with currently used electric vehicle charging devices is that a separate backup device must be installed to supply current to household loads using the vehicle's internal battery.

[0014] Figure 2 illustrates a conventional DC-type electric vehicle charging device.

[0015] Referring to FIG. 2, the charging device (100) receives AC current through the AC input terminal (110) and outputs a charging DC current to the DC output terminal (120) of the charging device (100) through the first input switching unit (191), the AC-DC converter (130), the DC-DC converter (140), and the first output switching unit (193).

[0016] When such a charging device is used, a backup device (400) must be additionally installed to supply current to a household load using the battery inside the electric vehicle.

[0017] When the output of the power supply unit (300) is normal, the backup device (400) receives current from the power supply unit (300) that supplies AC current through the backup device input terminal (410), and supplies current to a household load (500) through the load connection terminal (430) via the second input switching unit (491). At the same time, the output of the second input switching unit (491) outputs AC current for charging an electric vehicle to the backup device output terminal (420) through the first output switching unit (493).

[0018] When the output of the power supply unit (300) is abnormal, the backup device (400) turns off the second input switching unit (491) to cut off the power and turns on the first output switching unit (493) to supply the power of the electric vehicle battery supplied through the charging device (100) to the household load (500).

[0019] In this way, when the output of the power supply unit (300) is normal, current is supplied simultaneously to the household load (500) and the charging device (100), and when the output of the power supply unit (300) is abnormal, current can be supplied to the household load using the power of the battery inside the electric vehicle.

[0020] However, in order to supply current to a household load using the power of the battery inside the electric vehicle, a separate backup device (400) must be added and installed as described above. The second input switching unit (491) applied at this time places a burden on the configuration of the backup device (400) because it must control a large amount of current, which is the sum of the current supplied to the household load (500) and the current for charging the electric vehicle.

[0021] In addition, the backup device (400) and the electric vehicle charging device (100) must be connected by a separate communication line to perform linked control operations.

[0022] As such, since two devices must be installed and connected separately to form the system, there is a problem in that the manufacturing cost of the entire device for system construction increases and the installation for connection becomes complex.

[0023] Another problem with currently used electric vehicle charging devices is that if the device malfunctions, it cannot supply current to household loads.

[0024] Figure 3 illustrates another conventional electric vehicle charging device.

[0025] Referring to FIG. 3, the charging device (100) is an electric vehicle charging device connected to a power supply unit (300) and a household load (500), and is connected to the power supply unit (300) through an AC input terminal (110) and to the household load (500) through a load connection terminal (113).

[0026] Compared to Fig. 2, there is a difference in that the backup device (200) is removed while the load switching unit (185) is placed within the charging device (100).

[0027] The grid switching unit (183) can connect or disconnect the AC input terminal (110) to the AC-DC converter (130) and the load switching unit (185), and the load switching unit (185) can connect or disconnect the output of the grid switching unit (183) or the AC-DC converter (130) to the load connection terminal (113).

[0028] However, if a defect occurs in the charging device (100) and there is an abnormality in the switching unit (183, 185) of the charging device (100), there is a problem in that power cannot be supplied to the household load (500) even if the power supply unit (300) is normal.

[0029] Meanwhile, conventional electric vehicle charging devices must start the necessary operations for charging after verifying charging-related data through mutual data communication with the electric vehicle, but if the communication between the two parties is based on wireless communication, another problem may arise.

[0030] Currently, a system is being established to perform bidirectional communication between the electric vehicle charging device and the electric vehicle through a Control Pilot (CP) signal line connecting the charging device to the electric vehicle.

[0031] In other words, to perform bidirectional communication between the electric vehicle charging device and the electric vehicle, bidirectional communication can be carried out using the Power Line Communication (PLC) method as a high-level communication protocol. Signal messages modulated by the PLC are transmitted through the Control Pilot (CP) signal line.

[0032] However, the electric vehicle may support two-way communication while the charging device does not, or conversely, the charging device may support two-way communication while the electric vehicle does not, or neither the electric vehicle nor the charger may support two-way communication.

[0033] To support bidirectional communication in these existing systems, a separate wireless communication module can be added to the electric vehicle and the electric vehicle charger to enable relatively easy bidirectional wireless communication.

[0034] However, when charging is controlled via wireless communication between the electric vehicle charging device and the electric vehicle, it may be difficult to accurately verify the connection status of the charging cable and the communication status.

[0035] There is a problem that if a communication issue occurs between the wireless communication module of an electric vehicle and the wireless communication module of a charger, the charging device and the electric vehicle may improperly connect power lines, potentially causing serious safety issues and reduced charging efficiency in the electric vehicle charging system.

[0036] Technology development is required to address these issues of user inconvenience and concerns regarding accidents.

[0037] The present invention is to provide an electric vehicle charging device capable of automatically supplying current to a household load using the battery power of an electric vehicle without the user having to manually disconnect the connection to the power supply unit in the event of a power outage.

[0038] The present invention also aims to provide an electric vehicle charging device capable of supplying current to a household load using the battery power of an electric vehicle without installing a separate backup device.

[0039] The present invention is also intended to provide an electric vehicle charging device capable of supplying current to a household load even if a defect occurs in the charging device.

[0040] The present invention also aims to provide an electric vehicle charging device capable of enhancing the stability of an electric vehicle charging system by verifying the cable connection between the electric vehicle charging device and the electric vehicle and then connecting the power line, in preparation for the possibility that it may be difficult to accurately verify the connection status of the charging cable and the communication status when charging is controlled via wireless communication between the electric vehicle charging device and the electric vehicle.

[0041] Other technical problems not mentioned herein in relation to the present invention may be further understood from the description below.

[0042] An electric vehicle charging device capable of supplying current to a household load as an embodiment of the present invention for solving the above technical problem may include a power supply unit and an electric vehicle charging device connected to a household load, a grid switching unit that connects or disconnects the output of the power supply unit to the household load and the electric vehicle, an EV switching unit that connects or disconnects the output of the grid switching unit to the electric vehicle, and a control unit that controls each of the switching units.

[0043] 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.

[0044] In some embodiments of the present invention, the control unit can turn on the EV switching unit when connected to an electric vehicle.

[0045] 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.

[0046] 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 electric vehicle is greater than or equal to a predetermined value.

[0047] In some embodiments of the present invention, a grid switch may be included between the AC input terminal and the grid switching unit.

[0048] In some embodiments of the present invention, a load switch may be included between the grid switching unit and the load connection unit.

[0049] An electric vehicle charging device capable of supplying current to a household load according to another embodiment of the present invention for solving the above technical problem is an electric vehicle charging device connected to a power supply unit and a household load, and may include a bypass switching unit that connects or disconnects the output of the power supply unit to the household load, a grid switching unit that connects or disconnects the output of the power supply unit to the electric vehicle, a load switching unit that connects or disconnects the battery output of the electric vehicle to the household load, and a control unit that controls the switching unit.

[0050] In some embodiments of the present invention, the control unit may turn ON the bypass switching unit and turn OFF the load switching unit when the output of the power supply unit is normal.

[0051] In some embodiments of the present invention, the control unit may turn on the grid switching unit when connected to an electric vehicle.

[0052] In some embodiments of the present invention, the control unit may turn off the bypass switching unit and the grid switching unit when the output of the power supply unit is abnormal.

[0053] In some embodiments of the present invention, the control unit may turn on the load switching unit when the charge amount of the battery of the connected electric vehicle is greater than or equal to a predetermined value.

[0054] An electric vehicle charging device according to another embodiment of the present invention for solving the above technical problem is an electric vehicle charging device connected to a power supply unit and a household load, and may include a bypass switching unit that connects or disconnects the output of the power supply unit to the household load, a grid switching unit that connects or disconnects the output of the power supply unit, a load switching unit that connects or disconnects the output of the grid switching unit to the household load, and a control unit that controls the switching units.

[0055] In some embodiments of the present invention, the control unit may turn off the bypass switching unit, turn on the grid switching unit, and turn on the load switching unit when the output of the power supply unit is normal and connected to an electric vehicle.

[0056] In some embodiments of the present invention, the control unit may turn ON the bypass switching unit, turn OFF the grid switching unit, and turn OFF the load switching unit when the output of the power supply unit is normal and not connected to an electric vehicle.

[0057] In some embodiments of the present invention, the control unit may turn off the bypass switching unit and the grid switching unit when the output of the power supply unit is abnormal.

[0058] In some embodiments of the present invention, the control unit may turn on the load switching unit when the charge amount of the battery of the connected electric vehicle is greater than or equal to a predetermined value.

[0059] In some embodiments of the present invention, the bypass switching unit may include a power relay that connects an AC current and a signal relay that drives the power relay.

[0060] In some embodiments of the present invention, the power relay may be characterized as being cut off when there is no driving signal, and the signal relay may be connected when there is no driving signal.

[0061] The electric vehicle charging system equipped with wireless communication according to the present invention for solving the above technical problem may include an electric vehicle charging device that charges an electric vehicle and a battery of the electric vehicle, the electric vehicle charging device comprising an output switching unit that connects or disconnects a current for charging the electric vehicle, a wireless communication unit that communicates with the electric vehicle, and a charging device control unit that controls the output switching unit and the wireless communication unit, and an electric vehicle comprising a connection unit that connects or disconnects the output switching unit and the battery, an electric vehicle wireless communication unit that communicates with the electric vehicle charging device, and an electric vehicle control unit that controls the connection unit and the electric vehicle wireless communication unit, wherein the control units confirm that the electric vehicle and the electric vehicle charging device are connected to each other by a cable and start operation using wireless communication.

[0062] An electric vehicle charging device equipped with wireless communication according to the present invention for solving the above technical problem may include, in an electric vehicle charging device for charging a battery of an electric vehicle, an output switching unit that connects or cuts off a current for charging the electric vehicle, a wireless communication unit that communicates with the electric vehicle, and a charging device control unit that controls the output switching unit and the wireless communication unit, wherein the charging device control unit confirms that the electric vehicle and the charging device are connected to each other by a cable and starts operation using wireless communication.

[0063] In some embodiments of the present invention, the charging device control unit can check whether the electric vehicle and the cable are connected by checking the voltage of the PD (Proximity Detection).

[0064] In some embodiments of the present invention, the charging device control unit may determine that the electric vehicle is connected by a cable if the voltage of the PD (Proximity Detection) is greater than the reference voltage.

[0065] In some embodiments of the present invention, the charging device control unit can enable wireless communication operation when connected to the electric vehicle by a cable.

[0066] In some embodiments of the present invention, the charging device control unit may cut off the connection of the output switching unit when the electric vehicle is not connected by a cable.

[0067] In some embodiments of the present invention, the electric vehicle control unit can check whether the electric vehicle charging device and the cable are connected by checking the voltage of the PD (Proximity Detection).

[0068] In some embodiments of the present invention, the electric vehicle control unit may determine that it is connected to an electric vehicle charging device via a cable if the voltage of the PD (Proximity Detection) is lower than the reference voltage.

[0069] In some embodiments of the present invention, the electric vehicle control unit can enable wireless communication operation when connected to the electric vehicle charging device by a cable.

[0070] In some embodiments of the present invention, the electric vehicle control unit may block the connection of the connection unit when the electric vehicle is not connected by a cable.

[0071] An electric vehicle charging device capable of supplying current to a household load according to the present invention can automatically supply current to a household load without the user manually disconnecting the connection with the power supply unit.

[0072] The charging device of the present invention can also supply current to a household load using the battery power of an electric vehicle without installing a separate backup device.

[0073] The charging device of the present invention can also supply current to a household load even if the internal switching unit cannot be controlled normally due to a malfunction of the charging device.

[0074] The charging device of the present invention can also improve the stability of the electric vehicle charging system by checking the cable connection between the electric vehicle charging device and the electric vehicle, starting charging control via wireless communication between the electric vehicle charging device and the electric vehicle, and cutting off the output of the power line when the connection cable is not connected.

[0075] Figure 1 illustrates a conventional electric vehicle charging device.

[0076] Figure 2 illustrates a conventional DC-type electric vehicle charging device.

[0077] Figure 3 illustrates another conventional DC-type electric vehicle charging device.

[0078] FIG. 4 illustrates an electric vehicle charging device according to one embodiment of the present invention.

[0079] FIG. 5 illustrates a flowchart of a control unit of an electric vehicle charging device according to an embodiment of the present invention.

[0080] FIG. 6 illustrates the control of a switching unit of an electric vehicle charging device according to one embodiment of the present invention.

[0081] FIG. 7 illustrates an electric vehicle charging device according to another embodiment of the present invention.

[0082] FIG. 8 illustrates a flowchart of a control unit of an electric vehicle charging device according to another embodiment of the present invention.

[0083] FIG. 9 illustrates the control of a switching unit of an electric vehicle charging device according to another embodiment of the present invention.

[0084] FIG. 10 illustrates an electric vehicle charging device according to another embodiment of the present invention.

[0085] Figure 11 illustrates a bypass switching section according to Figure 10.

[0086] FIG. 12 illustrates a flowchart of a control unit of an electric vehicle charging device according to another embodiment of the present invention.

[0087] FIG. 13 illustrates the control of a switching unit of an electric vehicle charging device according to another embodiment of the present invention.

[0088] FIG. 14 illustrates an AC electric vehicle charging device and an electric vehicle according to one embodiment of the present invention.

[0089] FIG. 15 illustrates a DC electric vehicle charging device and an electric vehicle according to another embodiment of the present invention.

[0090] FIG. 16 illustrates a cable connection part according to the present invention.

[0091] FIG. 17 illustrates a flowchart of a charging device control unit according to one embodiment of the present invention.

[0092] FIG. 18 illustrates a flowchart of an electric vehicle control unit according to one embodiment of the present invention.

[0093] 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.

[0094] "And / or" includes each of the mentioned items and all combinations of one or more.

[0095] 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.

[0096] 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 interposed between them.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] FIG. 4 illustrates an electric vehicle charging device according to one embodiment of the present invention.

[0102] Referring to FIG. 4, the charging device (100) according to the present invention is an AC electric vehicle charging device connected to a power supply unit (300) and a household load (500), and receives AC current output from the power supply unit (300) and connected through a first switch (311) through an AC input terminal (110), and can be connected to a household load (500) through a load connection terminal (113).

[0103] At this time, the output current of the load connection terminal (113) is connected to the household load (500) via the second switch (511).

[0104] The first switch (311) and the second switch (511) can be connected or disconnected by the user.

[0105] The charging device (100) according to the present invention may include a grid switching unit (191) that connects or disconnects the output of a power supply unit (300) to a household load (500) and an electric vehicle (200), an EV switching unit (193) that connects or disconnects the output of the grid switching unit (191) to an electric vehicle (200), and a control unit (170) that controls each of the switching units (191, 193).

[0106] The grid switching unit (191) can connect or disconnect the output of the power supply unit (300) to both the electric vehicle (200) and the household load (500), and the EV switching unit (193) can connect or disconnect the output of the grid switching unit (191) to the electric vehicle (200).

[0107] The AC current output to the AC output terminal (120) via the EV switching unit (193) can be connected to the AC input terminal (210) of the electric vehicle (200). At this time, the AC current input to the AC input terminal (210) is converted into a DC current by the OBC (On Board Charger, 230) built into the electric vehicle and can charge the battery (280) of the electric vehicle (200) via the connection unit (260).

[0108] Since the OBC (On Board Charger, 230) can operate in both directions, it can operate by converting AC current into DC current and supplying it to the battery (280), and also by converting the DC current output from the battery (280) into AC current and supplying it to the charging device (100).

[0109] 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.

[0110] The grid switch (181) and the load switch (183) may not be included as their roles overlap with those of the first switch (311) and the second switch (511). Since electric vehicle charging devices may vary depending on the electrical regulations, standards, and criteria of each country, the grid switch (181) and the load switch (183) may not be included when the device is introduced in an environment where the first switch (311) and the second switch (511) are already installed.

[0111] When the output of the power supply unit (300) is normal, it can operate as follows.

[0112] The AC current supplied from the power supply unit (300) through the AC input terminal (110) can be input to the EV switching unit (193) and the load switch (183) by passing through the grid switch (181) that the user has switched to connect, and through the grid switching unit (191) that is turned ON by the control unit (170).

[0113] When the electric vehicle (200) is connected, the EV switching unit (193) is turned ON by the control unit (170) and outputs an AC current to the AC output terminal (120) for charging the battery (280) of the electric vehicle (200).

[0114] At the same time, the AC current supplied through the AC input terminal (110) passes through the load switch (183) that the user has switched to connect, and is output to the load connection terminal (113) to supply current to the household load (500).

[0115] In this way, the control unit (170) according to the present invention can turn on the grid switching unit (191) when the output of the power supply unit (300) is normal.

[0116] At this time, the control unit (170) can turn on the EV switching unit (193) when connected to an electric vehicle.

[0117] If the output of the power supply unit (300) is abnormal, it can be operated as follows.

[0118] If the output of the power supply unit (300) is abnormal, the control unit (170) can turn off the grid switching unit (191). That is, the grid switching unit (191) disconnects the output of the power supply unit (300) from both the electric vehicle (200) and the household load (500). Thus, the EV switching unit (193) and the load switch (183) can both be disconnected from the power supply unit (300).

[0119] When the output of the power supply unit (300) is abnormal and the electric vehicle (200) is connected, the DC current output from the battery (280) of the electric vehicle (200) can be output as AC current from the OBC (230). The electric vehicle (200) outputs AC current to the AC input terminal (210), and the charging device (100) can receive AC current through the AC output terminal (120). The AC output terminal (120) operates as the input terminal of the power supply for supplying current to the household load (500).

[0120] At this time, the EV switching unit (193) can be turned ON by the control unit (170). The AC current supplied through the AC output terminal (120) is supplied to the load switch (183) via the EV switching unit (193). The AC current passing through the load switch (183), which is switched to allow the next user to be connected, can be output to the load connection terminal (113).

[0121] The AC current output from the load connection terminal (113) can be supplied to the household load (500) via the second switch (511).

[0122] In this way, the control unit (170) according to the present invention can turn off the grid switching unit (191) when the output of the power supply unit (300) is abnormal.

[0123] At this time, the control unit (170) can turn on the EV switching unit (193) when the charge amount of the battery (280) of the connected electric vehicle (200) is greater than or equal to a predetermined value.

[0124] 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.

[0125] The control unit (170) checks the input voltage and current of the power supply unit (300) and can determine whether the power supply unit (300) can normally supply power to charge the electric vehicle (200) and operate the household load (500).

[0126] When connected to the electric vehicle (200), the control unit (170) communicates with the control unit (270) of the electric vehicle (200) to check whether the charging capacity of the battery (280) of the electric vehicle (200) can output the power required by the household load (500).

[0127] The control unit (170) can appropriately control each switching unit of the charging device (100) by recognizing whether the power supply unit (300) is operating normally, the connection status of the electric vehicle (200), and the amount of charge.

[0128] The above switching unit may be configured, for example, as a relay switch, and the output of the relay switch is maintained in a blocked or connected state before the driving signal of the control unit is input, and the state of the switch may be switched when the driving signal is transmitted.

[0129] FIG. 5 illustrates a flowchart of a control unit of an electric vehicle charging device according to one embodiment of the present invention, and FIG. 6 illustrates the control of a switching unit of an electric vehicle charging device according to one embodiment of the present invention.

[0130] The switching operation of the present invention will be explained with reference to FIGS. 5 and FIGS. 6.

[0131] A control unit (170) according to one embodiment of the present invention can control each switching unit (191, 193) so that when the output of the power supply unit (300) is normal and connected to the electric vehicle (200), the power supplied from the power supply unit (300) is supplied to the household load (500) and the electric vehicle (200). That is, the grid switching unit (191) can be turned 'ON' and the EV switching unit (193) can be turned 'ON'.

[0132] The control unit (170) can control each switching unit (191, 193) so that when the output of the power supply unit (300) is normal and not connected to an electric vehicle, the power supplied from the power supply unit (300) is supplied only to the household load (500). That is, the grid switching unit (191) can be turned 'ON' and the EV switching unit (193) can be turned 'OFF'.

[0133] The control unit (170) can control each switching unit (191, 193) so that power supplied from the battery (280) of the electric vehicle (200) is supplied to the household load (500) when the output of the power supply unit (300) is abnormal and connected to the electric vehicle (200) and at the same time the battery (280) of the electric vehicle (200) is charged above a predetermined level. That is, the grid switching unit (191) can be turned 'OFF' and the EV switching unit (193) can be turned 'ON'.

[0134] At this time, the predetermined level must be a level at which the electric vehicle (200) can travel a certain distance. For example, it can be set to a 30% level so that the power of the battery (280) of the electric vehicle (200) does not decrease further at 30% or less.

[0135] The control unit (170) can control each switching unit (191, 193) so that the connection between them is cut off when the output of the power supply unit (300) is abnormal and not connected to the electric vehicle (200), or when the charge amount of the battery (280) is below a predetermined level even if connected. That is, the grid switching unit (191) can be turned 'OFF' and the EV switching unit (193) can be turned 'OFF'.

[0136] As such, the electric vehicle charging device of the present invention can supply power from the electric vehicle battery to a household load when the power supply is abnormal and the charge level of the electric vehicle battery is higher than a predetermined value. In particular, without the user manually disconnecting the connection to the power supply unit, it can automatically supply current to a household load by determining the charge level of the battery inside the electric vehicle and the power outage.

[0137] In particular, it is possible to prevent accidents that may occur when the OBC (On Board Charger, 230) of the electric vehicle (200) operates while connected to the power supply unit during a power outage.

[0138] FIG. 7 illustrates an electric vehicle charging device according to another embodiment of the present invention.

[0139] Referring to FIG. 7, the charging device (100) according to the present invention is an electric vehicle charging device connected to a power supply unit (300) and a household load (500), and can be connected to the power supply unit (300) through an AC input terminal (110) and to the household load (500) through a load connection terminal (113).

[0140] It may include a bypass switching unit (181) that connects or disconnects the output of the power supply unit (300) to a household load (500), a grid switching unit (183) that connects or disconnects the output of the power supply unit (300) to an AC-DC converter (130), a load switching unit (185) that connects or disconnects the output of the AC-DC converter (130) to a household load (500), and a control unit (170) that controls the switching units (181, 183, 185).

[0141] The bypass switching unit (181) can connect or disconnect the output of the power supply unit to a household load, the grid switching unit (183) can connect or disconnect the output of the power supply unit to an electric vehicle, and the load switching unit (185) can connect or disconnect the battery output of the electric vehicle to a household load (500).

[0142] When the output of the power supply unit (300) is normal, it can operate as follows.

[0143] The AC current supplied from the power supply unit (300) through the AC input terminal (110) passes through the grid switching unit (183) controlled to be ON, is input to the AC-DC converter (130), and can be converted into DC current and output.

[0144] The output DC current of the AC-DC converter (130) is converted into a DC current having a voltage suitable for charging an electric vehicle in the DC converter (140) and outputs the DC current as charging power for the electric vehicle's battery to the DC output terminal (120) of the charging device (100) via the first output switching unit (193).

[0145] At the same time, the AC current supplied from the power supply unit (300) through the AC input terminal (110) is output to the load connection terminal (113) via the bypass switching unit (181) controlled to be ON, thereby supplying current to the household load (500).

[0146] In this way, the control unit (170) can turn on the bypass switching unit (181) and turn off the load switching unit (185) when the output of the power supply unit (300) is normal.

[0147] At this time, the control unit (170) can turn on the grid switching unit (183) when connected to an electric vehicle.

[0148] If the output of the power supply unit (300) is abnormal, it can be operated as follows.

[0149] Since the AC current supplied through the AC input terminal (110) from the power supply unit (300) is abnormal, the grid switching unit (183) can be turned OFF to cut off the current input to the AC-DC converter (130). At the same time, the bypass switching unit (181) can be turned OFF to cut off the connection between the load connection terminal (113) and the power supply unit (300).

[0150] On the other hand, DC current output from the charged battery of the electric vehicle can be input to the DC output terminal (120). That is, the DC output terminal (120) operates as a power supply terminal to supply current to the household load (500).

[0151] The DC current input to the DC output terminal (120) can be converted into an AC current capable of supplying power to a household load (500) by passing through the DC converter (140) and the AC-DC converter (130).

[0152] The DC converter (140) and the AC-DC converter (130) can be formed to operate in both directions, and since their configuration and operation are the same as those of a conventional bidirectional electric vehicle charging device, a detailed description is omitted.

[0153] The AC current output from the AC-DC converter (130) can be connected to a household load (500) via the load switching unit (185) and the load connection terminal (113).

[0154] The above control unit (170) can turn off the bypass switching unit (181) and turn on the load switching unit (185) when the output of the power supply unit (300) is abnormal and the charging power of the battery of the connected electric vehicle can supply power to the household load (500).

[0155] At this time, the control unit (170) can turn off the grid switching unit (183) when the output of the power supply unit (300) is abnormal.

[0156] The three switching units (181, 183, 185) configured in this way, namely the bypass switching unit (181), the grid switching unit (183), and the load switching unit (185), can all be configured with switching units of the same capacity.

[0157] Generally, the power capacity of the power supply unit (300) is set to be more than twice the combined power capacity of the household load (500) and the battery charging capacity of the electric vehicle. For example, if the power capacity of the power supply unit (300) is set to 22.8kW and the power capacity of the household load (500) and the battery charging capacity of the electric vehicle are each set to 11.4kW, then each switching unit (181, 183, 185) can be configured with the same current capacity of 48A.

[0158] 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.

[0159] The control unit (170) checks the voltage and current of the power supply unit (300) and can determine whether the power supply unit (300) can normally supply power for charging the battery of an electric vehicle or power to operate a household load (500).

[0160] When connected to an electric vehicle, the control unit (170) communicates with the control unit (not shown) of the electric vehicle to check whether the charging capacity of the electric vehicle's battery can output the power required by the household load (500).

[0161] The control unit (170) can appropriately control each switching unit of the charging device (100) by recognizing whether the power supply unit (300) is operating normally, the connection status of the electric vehicle, and the amount of charge.

[0162] The above switching unit may be configured, for example, as a relay switch, and the output of the relay switch is maintained in a blocked or connected state before the driving signal of the control unit is input, and the state of the switch may be switched when the driving signal is transmitted.

[0163] For example, the bypass switching unit (181) is formed in a connected state before the driving signal is input, and the load switching unit (185) is formed in a cut-off state before the driving signal is input, thereby ensuring the stability of the device so that the power supply unit (300) can supply power to the household load (500) preferentially.

[0164] FIG. 8 illustrates a flowchart of a control unit of an electric vehicle charging device according to one embodiment of the present invention, and FIG. 9 illustrates the control of a switching unit of an electric vehicle charging device according to one embodiment of the present invention.

[0165] The switching operation of the present invention will be explained with reference to FIGS. 8 and FIGS. 9.

[0166] A control unit (170) according to one embodiment of the present invention can control each switching unit (181, 183, 185) so that when the output of the power supply unit (300) is normal and connected to an electric vehicle, the power supplied from the power supply unit (300) is supplied to a household load (500) and an electric vehicle. That is, the bypass switching unit (181) can be turned 'ON', the grid switching unit (183) can be turned 'ON', and the load switching unit (185) can be turned 'OFF'.

[0167] The control unit (170) can control each switching unit (181, 183, 185) so that when the output of the power supply unit (300) is normal and not connected to an electric vehicle, the power supplied from the power supply unit (300) is supplied to the household load (500). That is, the bypass switching unit (181) can be turned 'ON', and the grid switching unit (183) and load switching unit (185) can be turned 'OFF'.

[0168] The control unit (170) can control each switching unit (181, 183, 185) so that power supplied from the electric vehicle battery is supplied to the household load (500) when the output of the power supply unit (300) is abnormal and connected to the electric vehicle and at the same time the battery of the electric vehicle is charged above a predetermined level. That is, the bypass switching unit (181) and the grid switching unit (183) can be turned 'OFF' and the load switching unit (185) can be turned 'ON'.

[0169] At this time, the specified level must be a level at which the electric vehicle can operate immediately and travel a certain distance. For example, it can be set to a 30% level so that the power of the electric vehicle's battery does not decrease further when it is below 30%.

[0170] The control unit (170) can turn off each of the switching units (181, 183, 185) when the output of the power supply unit (300) is abnormal and is not connected to the electric vehicle, or when it is connected but the charge amount of the battery is not charged above a predetermined level.

[0171] In this way, the electric vehicle charging device of the present invention can supply power from the electric vehicle battery to a household load when the power supply is not normal and at the same time the charge amount of the electric vehicle battery is higher than a predetermined value. In this way, the convenience of using the electric vehicle charging device can be dramatically improved.

[0172] In addition, by configuring each switching unit with identical specifications that do not differ in current capacity, stability can be ensured for the operation and maintenance of the device.

[0173] FIG. 10 illustrates an electric vehicle charging device according to another embodiment of the present invention.

[0174] Referring to FIG. 10, the charging device (100) according to the present invention is an electric vehicle charging device connected to a power supply unit (300) and a household load (500), and can be connected to the power supply unit (300) through an AC input terminal (110) and to the household load (500) through a load connection terminal (113).

[0175] It may include a bypass switching unit (181) that connects or disconnects the output of the power supply unit (300) to a household load (500), a grid switching unit (183) that connects or disconnects the output of the power supply unit (300), a load switching unit (185) that connects or disconnects the output of the grid switching unit (183) to a household load (500), and a control unit (170) that controls the switching units (181, 183, 185).

[0176] The bypass switching unit (181) can connect or disconnect the AC input terminal (110) and the load connection terminal (113), the grid switching unit (183) can connect or disconnect the AC input terminal (110) to the AC-DC converter (130) and the load switching unit (185), and the load switching unit (185) can connect or disconnect the output of the grid switching unit (183) or the AC-DC converter (130) to the load connection terminal (113).

[0177] 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.

[0178] The control unit (170) checks the voltage of the power supply unit (300) in real time and can determine whether the power supply unit (300) can normally supply power to charge the battery of an electric vehicle or power to operate a household load (500).

[0179] When connected to an electric vehicle, the control unit (170) communicates with the control unit (not shown) of the electric vehicle to check whether the charging capacity of the electric vehicle's battery can output the power required by the household load (500).

[0180] The control unit (170) can appropriately control each switching unit of the charging device (100) by recognizing whether the power supply unit (300) is operating normally, the connection status of the electric vehicle, and the amount of charge.

[0181] The above switching unit may be configured, for example, as a relay switch, and the output of the relay switch is maintained in a blocked or connected state before a driving signal from the control unit is input, and when the driving signal is transmitted, the state of the relay switch may be switched according to the driving signal.

[0182] When the electric vehicle charging device is operating normally, if the output of the power supply unit (300) is normal and the electric vehicle is connected to the charging device, it can operate as follows.

[0183] The AC current supplied from the power supply unit (300) through the AC input terminal (110) is input to the AC-DC converter (130) via the grid switching unit (183) which is controlled to be ON, and can be converted into DC current and output from the AC-DC converter (130).

[0184] The DC current output of the AC-DC converter (130) is converted into a DC current of a voltage suitable for charging an electric vehicle in the DC converter (140) and can output a DC current for charging the battery of an electric vehicle to the DC output terminal (120) of the charging device (100) via the first output switching unit (193).

[0185] At the same time, the AC current supplied from the power supply unit (300) through the AC input terminal (110) passes through the grid switching unit (183) and passes through the load switching unit (185) controlled to be ON, and is output to the load connection terminal (113) to supply current to the household load (500).

[0186] In this way, the control unit (170) can turn off the bypass switching unit (181), turn on the grid switching unit (183), and turn on the load switching unit (185) when the output of the power supply unit (300) is normal and connected to an electric vehicle.

[0187] However, if the electric vehicle is not connected to the charging device, the bypass switching unit (181) is turned ON, the grid switching unit (183) is turned OFF, and the load switching unit (185) is turned OFF so that current is not supplied to the electric vehicle for charging the battery, and current is supplied only to the household load (500).

[0188] When the electric vehicle charging device is operating normally, if the output of the power supply unit (300) is abnormal, it may operate as follows.

[0189] Since the AC current supplied from the power supply unit (300) through the AC input terminal (110) is abnormal, the grid switching unit (183) can be turned OFF to cut off the current input to the AC-DC converter (130). At the same time, the bypass switching unit (181) can be turned OFF to cut off the connection between the load connection terminal (113) and the power supply unit (300).

[0190] On the other hand, DC current output from the charged battery of the electric vehicle can be input to the DC output terminal (120). That is, the DC output terminal (120) operates as a power supply terminal to supply current to the household load (500).

[0191] The DC current input to the DC output terminal (120) can be converted into an AC current capable of supplying power to a household load (500) by passing through the DC converter (140) and the AC-DC converter (130).

[0192] The DC converter (140) and the AC-DC converter (130) can be formed to operate in both directions, and since their configuration and operation are the same as those of a conventional bidirectional electric vehicle charging device, a detailed description is omitted.

[0193] The control unit (170) can turn on the load switching unit (185) when the output of the power supply unit (300) is abnormal and the charging power of the battery of the connected electric vehicle can supply power to the household load (500).

[0194] The AC current output from the AC-DC converter (130) can be connected to a household load (500) via the load switching unit (185) and the load connection terminal (113).

[0195] FIG. 12 illustrates a flowchart of a control unit of an electric vehicle charging device according to one embodiment of the present invention, and FIG. 13 illustrates the control of a switching unit of an electric vehicle charging device according to one embodiment of the present invention.

[0196] The switching operation of the present invention will be explained with reference to FIGS. 12 and FIGS. 13.

[0197] A control unit (170) according to one embodiment of the present invention can control each switching unit (181, 183, 185) so that when the output of the power supply unit (300) is normal and connected to an electric vehicle, the power supplied from the power supply unit (300) is supplied to a household load (500) and an electric vehicle. That is, the bypass switching unit (181) can be turned 'OFF', the grid switching unit (183) can be turned 'ON', and the load switching unit (185) can be turned 'ON'.

[0198] The control unit (170) can control each switching unit (181, 183, 185) so that when the output of the power supply unit (300) is normal and not connected to an electric vehicle, the power supplied from the power supply unit (300) is supplied to the household load (500). That is, the bypass switching unit (181) can be turned 'ON', and the grid switching unit (183) and load switching unit (185) can be turned 'OFF'.

[0199] The control unit (170) can control each switching unit (181, 183, 185) so that the output current of the battery is supplied to the household load (500) when the output of the power supply unit (300) is abnormal and connected to the electric vehicle and at the same time the battery of the electric vehicle is charged above a predetermined level, that is, when the battery can be discharged so as to supply power. That is, the bypass switching unit (181) and the grid switching unit (183) can be turned 'OFF' and the load switching unit (185) can be turned 'ON'.

[0200] At this time, the specified level must be a level at which the electric vehicle can operate immediately and travel a certain distance. For example, it can be set to a 30% level so that the power of the electric vehicle's battery does not decrease further when it is below 30%.

[0201] The control unit (170) can turn off each of the switching units (181, 183, 185) when the output of the power supply unit (300) is abnormal and is not connected to the electric vehicle, or when it is connected but the charge amount of the battery is not charged above a predetermined level.

[0202] In this way, the electric vehicle charging device of the present invention can supply power from the electric vehicle battery to a household load when the power supply is not normal and at the same time the charge amount of the electric vehicle battery is higher than a predetermined value.

[0203] However, there may be cases where the electric vehicle charging device does not operate normally due to problems such as unexpected defects. In such cases, even though the output of the power supply unit (300) is normal, power is not supplied to the household load (500), so the user may experience serious inconvenience. To prepare for such cases, the bypass switching unit (181) according to the present invention may be configured as follows.

[0204] Figure 11 illustrates a bypass switching section according to Figure 10.

[0205] Referring to FIG. 11, the bypass switching unit (181) according to the present invention may include a power relay (181p) that connects AC current and a signal relay (181s) that drives the power relay (181p).

[0206] At this time, the power relay (181p) may be characterized as being cut off when there is no driving signal, and the signal relay (181s) may be connected when there is no driving signal.

[0207] The power supply unit (300) supplies AC current to two lines, L1 and L2, and the bypass switching unit (181) may include two power relays (181p) that connect or disconnect L1 and L2 lines, respectively. At this time, the two power relays (181p) may be one component included in one package.

[0208] L1 line and L2 line can be connected to each input terminal of the power relay (181p), and L1' line and L2' line of the household load (500) can be connected to each output terminal.

[0209] The L1 line is connected to the input terminal of the driving part of the power relay (181p), and the input terminal of the signal relay (181s) can be connected to the output terminal.

[0210] The output terminal of the driving part of the power relay (181p) is connected to the input terminal of the signal relay (181s), and the L2 line can be connected to the output terminal.

[0211] The driving signal of the control unit (170) is connected to the input terminal of the driving unit of the signal relay (181s), and the output terminal can be connected to the secondary side ground. The bypass switching unit (181) may include two signal relays (181s) to drive two power relays (181p). In this case, the two signal relays (181s) may be one component configured in one package.

[0212] In particular, the power relay (181p) according to the present invention may be characterized by being cut off when there is no driving signal, and the signal relay (181s) may be connected when there is no driving signal.

[0213] When the driving signal of the control unit (170) is output as 'H', the signal relay (181s) is configured to be connected when there is no driving signal and disconnected when there is a driving signal, so the input and output terminals are disconnected, and the driving part of the power relay (181p) is also disconnected. Since the power relay (181p) is configured to be disconnected when there is no driving signal and connected when there is a driving signal, the input and output terminals of the power relay (181p) are also disconnected, so both the L1 line and L2 line constituting the AC current are disconnected, and no current is supplied to the household load (500). On the other hand, when the driving signal of the control unit (170) is output as 'L', the input and output terminals of the signal relay (181s) are connected, and the driving part of the power relay (181p) is also connected. Therefore, the input and output terminals of the power relay (181p) are also connected, so both the L1 line and L2 line constituting the AC current are connected, and current is supplied to the household load (500).

[0214] In this way, when the driving signal of the control unit (170) is output as 'H', the bypass switching unit (193) is turned OFF and blocked, and when the driving signal is output as 'L', the bypass switching unit (193) can be connected to be turned ON.

[0215] If the electric vehicle charging device fails to operate normally due to an unexpected malfunction or other issues, the control unit (170) is not applied to the signal relay (181s). Since the input and output terminals of the power relay (181p) are connected in the same way as when the driving signal of the control unit (170) outputs 'L', both the L1 line and the L2 line are connected, allowing current to be supplied to the household load (500).

[0216] As such, since the bypass switching unit (181) according to the present invention drives the power relay (181p) using the L1 and L2 lines of the AC current of the power supply unit (300), power can be supplied to the household load (500) even if the secondary circuit of the electric vehicle charging device becomes inoperable due to a defect. In particular, since the signal relay (181s) plays the role of isolating and separating the primary circuit and the secondary circuit, and the power relay (181p) is composed only of the primary circuit, the probability of failure of the bypass switching unit (181) is low when problems such as insulation breakdown occur between the primary circuit and the secondary circuit due to causes such as lightning strikes. Therefore, the probability of a situation occurring where power cannot be supplied to the household load (500) can be minimized.

[0217] Hereinafter, an electric vehicle charging device equipped with wireless communication according to the present invention and a system including the same will be described with reference to the drawings.

[0218] FIG. 14 illustrates an AC electric vehicle charging device and an electric vehicle according to one embodiment of the present invention.

[0219] Referring to FIG. 14, an AC electric vehicle charging system may include an electric vehicle charging device (100) and an electric vehicle (200).

[0220] An electric vehicle charging device (100) according to one embodiment of the present invention may include an AC output switching unit (192a) for connecting or cutting off a current for charging the electric vehicle (200), a wireless communication unit (171) for communicating with the electric vehicle (200), and a charging device control unit (170) for controlling the AC output switching unit (192a) and the wireless communication unit (171).

[0221] Charging power is supplied from a power supply unit (300) that supplies AC current, and is output to the AC output terminal (110) of the charging device (100) via a power switching unit (191) and an AC output switching unit (192a).

[0222] The above power supply unit (300) is a power supply network including a transmission / distribution power grid.

[0223] The electric vehicle (200) may include a connection unit (240) that connects or disconnects the battery of the electric vehicle (200) to the AC output switching unit (192a), an electric vehicle wireless communication unit (271) that communicates with the electric vehicle charging device (100), and an electric vehicle control unit (270) that controls the connection unit (240) and the electric vehicle wireless communication unit (271).

[0224] The AC output terminal (110) is connected to the AC input terminal (210) of the electric vehicle to charge the battery (280) of the electric vehicle (200). At this time, the AC current of the AC input terminal (210) is converted into DC current by the OBC (On Board Charger, 230) built into the electric vehicle and supplied to the battery (280) through the connection part (240).

[0225] The electric vehicle charging device (100) and the electric vehicle (200) can be connected to each other by a cable.

[0226] The cable may include a power line that supplies AC current by connecting the AC output terminal (110) and the AC input terminal (210), a grounding line for connecting the grounds to each other, and a PD (Proximity Detection) line.

[0227] FIG. 15 illustrates a DC electric vehicle charging device and an electric vehicle according to another embodiment of the present invention.

[0228] Referring to FIG. 15, a DC electric vehicle charging system may include an electric vehicle charging device (100) and an electric vehicle (200).

[0229] An electric vehicle charging device (100) according to another embodiment of the present invention may include a DC output switching unit (192d) for connecting or disconnecting a current for charging the electric vehicle (200), a wireless communication unit (171) for communicating with the electric vehicle (200), and a charging device control unit (170) for controlling the DC output switching unit (192d) and the wireless communication unit (171).

[0230] Charging power is supplied from a power supply unit (300) that supplies AC current, passes through a power switching unit (191), passes through an AC-DC converter (130) that converts AC current into DC current, passes through a DC converter (140) that converts to a voltage of the size required by the electric vehicle (200), and finally passes through a DC output switching unit (192d) to output charging power to the DC output terminal (120) of the charging device (100).

[0231] The above power supply unit (300) is a power supply network including a transmission / distribution power grid.

[0232] The electric vehicle (200) may include a connection unit (240) that connects or disconnects the DC output switching unit (192d) and the battery of the electric vehicle (200), an electric vehicle wireless communication unit (271) that communicates with the electric vehicle charging device (100), and an electric vehicle control unit (270) that controls the connection unit (240) and the electric vehicle wireless communication unit (271).

[0233] The DC output terminal (120) is connected to the DC input terminal (220) of the electric vehicle (200) to charge the battery (280) of the electric vehicle (200). At this time, since the DC input terminal (220) is input as DC current, it is supplied to the battery (280) through the connection part (240) without a separate conversion process.

[0234] The electric vehicle charging device (100) and the electric vehicle (200) can be connected to each other by a cable.

[0235] The cable may include a power line that supplies DC current by connecting the DC output terminal (120) and the DC input terminal (220), a grounding line for connecting the grounds to each other, and a PD (Proximity Detection) line.

[0236] The PD (Proximity Detection) line included in the embodiment of the present invention is a signal line for checking whether a charging cable is plugged into the charging port, and if the charging cable is plugged into the charging port, the electric vehicle cannot move.

[0237] FIG. 16 illustrates a cable connection part according to the present invention.

[0238] Referring to FIGS. 14 to 16, the PD1 terminal (101) of the charging device control unit (170) of the electric vehicle charging device (100) and the PD2 terminal (201) of the electric vehicle control unit (270) of the electric vehicle (200) can be connected to each other by a PD line.

[0239] A pull-down resistor R5 may be embedded between the PD line and the ground line in the inlet port inside the electric vehicle (200), and a pull-down resistor R7 may be installed between the PD line and the ground line in the cable of the electric vehicle charging device (100). Additionally, a pull-up resistor R4 may be installed between the PD2 terminal (201) of the electric vehicle control unit (270), the power supply, and 5V.

[0240] When the electric vehicle (200) and the electric vehicle charging device (100) are not connected by a cable, that is, when the PD line is not connected, a voltage of 0V is applied to the PD1 terminal (101) of the electric vehicle charging device (100). When the electric vehicle (200) and the electric vehicle charging device (100) are connected by a cable, that is, when the PD line is connected, a voltage divided by the parallel combined resistance of resistor R4, resistor R7, and resistor R5 is applied to the PD1 terminal (101) of the electric vehicle charging device (100).

[0241] In this way, the voltage rises from 0V, and by setting a reference voltage to an intermediate voltage value between the two and comparing them, the charging device control unit (170) can detect the connection and disconnection of the cable.

[0242] When the electric vehicle (200) and the electric vehicle charging device (100) are not connected by a cable, that is, when the PD line is not connected, a voltage of 5 V is applied to the PD2 terminal (201) of the electric vehicle (200). When the electric vehicle (200) and the electric vehicle charging device (100) are connected by a cable, that is, when the PD line is connected, a voltage divided by the parallel combined resistance of resistor R4 and resistor R7 and resistor R5 is applied to the PD2 terminal (201) of the electric vehicle (200).

[0243] In this way, the voltage is reduced from 5 V, and by setting a reference voltage to an intermediate voltage value between the two and comparing them, the electric vehicle control unit (270) can detect the connection and disconnection of the cable.

[0244] The charging device control unit (170) and the electric vehicle control unit (270) of the electric vehicle charging device (100) of the electric vehicle charging system according to an embodiment of the present invention may be characterized by being able to confirm that the electric vehicle (200) and the electric vehicle charging device (100) are connected to each other by a cable, and when they are connected to each other, starting operation using wireless communication.

[0245] The charging device control unit (170) of the electric vehicle charging device (100) according to the embodiment can check whether the electric vehicle (200) and the cable are connected by checking the voltage of the PD (Proximity Detection), and the electric vehicle control unit (270) can check whether the electric vehicle charging device (100) and the cable are connected by checking the voltage of the PD (Proximity Detection).

[0246] The charging device control unit (170) and the electric vehicle control unit (270) of the electric vehicle charging device (100) can communicate with each other to check the required charging type of the electric vehicle (200).

[0247] The charging device control unit (170) of the electric vehicle charging device (100) can recognize the state of the power supply unit (300) and the required charging type of the electric vehicle (200), and appropriately control each switching unit of the electric vehicle charging device (100).

[0248] The switching unit may be composed of, for example, a relay switch, and the relay switch may be switched to a cut-off state or a connected state depending on the input of a driving signal from the control unit.

[0249] FIG. 17 illustrates a flowchart of a charging device control unit according to one embodiment of the present invention.

[0250] Referring to FIG. 17, the operation of the charging device control unit (170) of the electric vehicle charging device (100) is explained.

[0251] The above charging device control unit (170) may include a microcontroller and a memory, and may perform control operations of the power supply device according to the present invention by a microcontroller that executes a program stored in the memory.

[0252] A charging device control unit (170) according to an embodiment of the present invention can check whether the electric vehicle (200) and the cable are connected by checking the voltage of the PD (Proximity Detection), and at this time, if the voltage of the PD (Proximity Detection) is greater than the reference voltage, it can be determined that the electric vehicle (200) is connected.

[0253] First, the charging device control unit (170) can check whether it is connected to the electric vehicle wireless communication unit (271) through the wireless communication unit (171).

[0254] When the wireless communication units (171, 271) are connected to each other, that is, when the PD voltage is the same as the voltage when the cable is connected, wireless communication with the electric vehicle (200) is continued, and wireless communication data with the electric vehicle (200) is validated to perform operations such as charging.

[0255] At this time, if the wireless communication units (171, 271) are not connected to each other, that is, if the PD voltage is not equal to the voltage when the cable is connected, the connection of the output switching unit (192a, 192d) can be blocked.

[0256] At this time, in the case of an AC electric vehicle charging device as in FIG. 14, the connection of the AC output switching unit (192a) can be cut off, and in the case of a DC electric vehicle charging device as in FIG. 15, the connection of the DC output switching unit (192d) can be cut off.

[0257] By blocking in this way, the mutual stability between the electric vehicle charging device and the electric vehicle in the electric vehicle charging system can be enhanced.

[0258] FIG. 18 illustrates a flowchart of an electric vehicle control unit according to one embodiment of the present invention.

[0259] The operation of the electric vehicle control unit (270) of the electric vehicle (200) is explained with reference to FIG. 18.

[0260] The above electric vehicle control unit (270) may include a microcontroller and a memory, and may perform control operations of the power supply device according to the present invention by a microcontroller that executes a program stored in the memory.

[0261] The electric vehicle control unit (270) according to an embodiment of the present invention can check whether the electric vehicle charging device (100) and the cable are connected by checking the voltage of the PD (Proximity Detection), and at this time, if the voltage of the PD (Proximity Detection) is lower than the reference voltage, it can be determined that the electric vehicle charging device (100) is connected.

[0262] First, the electric vehicle control unit (270) can check whether it is connected to the wireless communication unit (171) of the electric vehicle charging device (100) through the electric vehicle wireless communication unit (271).

[0263] When the wireless communication units (171, 271) are connected to each other, that is, when the PD voltage is the same as the voltage when the cable is connected, wireless communication with the electric vehicle charging device (100) is continued, and wireless communication data with the electric vehicle charging device (100) is validated to perform operations such as charging.

[0264] At this time, if the wireless communication units (171, 271) are not connected to each other, that is, if the PD voltage is not equal to the voltage when the cable is connected, the connection of the connection unit (240) can be blocked.

[0265] By blocking in this way, the mutual stability between the electric vehicle charging device and the electric vehicle in the electric vehicle charging system can be enhanced.

[0266] As such, the electric vehicle charging system according to the embodiment of the present invention can enhance the stability of the electric vehicle charging system by checking the cable connection between the electric vehicle charging device and the electric vehicle, starting charging control via wireless communication between the electric vehicle charging device and the electric vehicle, and cutting off the output of the power line when the connection cable is not connected.

[0267] 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.

[0268] 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. As an electric vehicle charging device connected to a power supply unit and a household load, A grid switching unit that connects or disconnects the output of the above power supply unit to a household load and an electric vehicle; EV switching unit that connects or disconnects the output of the grid switching unit to the electric vehicle; and An electric vehicle charging device comprising a control unit that controls each of the above switching units.

2. In Paragraph 1, The above control unit is, When the output of the above power supply unit is normal, Turn on the grid switching unit, and turn on the EV switching unit when connected to an electric vehicle, and If the output of the above power supply unit is abnormal, An electric vehicle charging device that turns off the grid switching unit and turns on the EV switching unit when the charge amount of the battery of the connected electric vehicle is greater than or equal to a predetermined value.

3. In Paragraph 1, A grid switch is included between the AC input terminal and the grid switching unit, and An electric vehicle charging device comprising a load switch between the grid switching unit and the load connection unit.

4. As an electric vehicle charging device connected to a power supply unit and a household load, A grid switching unit that connects or disconnects the output of the above power supply unit; A bypass switching unit that connects or disconnects the household load between the power supply unit and the grid switching unit; A load switching unit that connects or disconnects the household load between the grid switching unit and the electric vehicle; and An electric vehicle charging device comprising a control unit that controls each of the above switching units.

5. In Paragraph 4, The above control unit is, When the output of the above power supply unit is normal, Turn the bypass switching unit ON, turn the load switching unit OFF, and turn the grid switching unit ON when connected to an electric vehicle, and If the output of the above power supply unit is abnormal, Turn OFF the bypass switching unit and the grid switching unit, and An electric vehicle charging device that turns on a load switching unit when the charge amount of a connected electric vehicle battery is greater than or equal to a predetermined value.

6. In Paragraph 4, The above control unit is, When the output of the above power supply unit is normal, When connected to an electric vehicle, the bypass switching unit is turned OFF, and the grid switching unit and load switching unit are turned ON. When not connected to an electric vehicle, the bypass switching unit is turned ON, and the grid switching unit and load switching unit are turned OFF. When the output of the above power supply unit is abnormal, An electric vehicle charging device that turns off the bypass switching unit and the grid switching unit, and turns on the load switching unit when the charge amount of the battery of the connected electric vehicle is greater than or equal to a predetermined value.

7. In Paragraph 4, The above bypass switching unit includes a power relay that connects AC current and a signal relay that drives the power relay, and An electric vehicle charging device in which the power relay is cut off when there is no driving signal, and the signal relay is connected when there is no driving signal.

8. As an electric vehicle charging device for charging the battery of an electric vehicle, It includes an output switching unit for connecting or cutting off current for charging the electric vehicle, a wireless communication unit for communicating with the electric vehicle, and a charging device control unit for controlling the output switching unit and the wireless communication unit. An electric vehicle charging device characterized by the above-described charging device control unit confirming that the electric vehicle and the above-described charging device are connected to each other via a cable and starting operation using wireless communication.

9. In Paragraph 8, The above charging device control unit checks whether the electric vehicle and the cable are connected using the PD (Proximity Detection) voltage, and Enable wireless communication operation when connected to an electric vehicle via cable, and An electric vehicle charging device that blocks the connection of the output switching unit when the connection is not established.

10. In Paragraph 9, The above charging device control unit determines that the electric vehicle is connected to the electric vehicle via a cable if the voltage of the PD (Proximity Detection) is greater than the reference voltage.

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