KR20210081497A - Common charger for charging electric vehicle, plug and concentric plug of common charge - Google Patents

Abstract

The present invention relates to a common charging device for charging electric vehicles, and a plug and a socket thereof. The common charging device includes: a socket part into which a plug part is inserted, and which supplies power to the plug part, and transmits a control signal for charging an electric vehicle; a relay switch supplying power to the plug part in accordance with control by a control part; and the control part controlling the relay switch by sensing the plug part inserted into the socket part, depending on whether the control signal is sensed. The socket part includes: a socket body part having a concave shape into which the plug part can be inserted; a plug pin connection part which is formed in the socket body part, and into which a plug pin of the plug part is inserted; a socket earth terminal formed in the socket body part, and connected with an earth; a socket control terminal formed in the socket body part, and connected with the control part to deliver the control signal; and first and second guide groove parts formed on an inner wall of the socket body part, wherein the first and second guide groove parts are different in shape. Therefore, the present invention is capable of preventing the plug part from being inserted incorrectly.

Description

A common charging device capable of charging an electric vehicle, and a plug and outlet of the charging device {COMMON CHARGER FOR CHARGING ELECTRIC VEHICLE, PLUG AND CONCENTRIC PLUG OF COMMON CHARGE}

The present invention relates to a common charging device capable of charging an electric vehicle, a plug and an outlet for the charging device, and more particularly, to an electric mobility device including an electric vehicle or a kickboard using a 220VAC commercial outlet, and a portable terminal. A common charging device capable of charging an electric vehicle, the plug of the charging device, and a common charging device capable of charging an electric vehicle, which prevent erroneous insertion of the plug part when the plug part of the electric vehicle is inserted into the outlet part of the common charging device that can charge general electric devices in common It's about outlets.

In general, an electric vehicle refers to a vehicle operated using electricity, and can be largely divided into a battery powered electric vehicle and a hybrid electric vehicle. Here, a pure electric vehicle is a vehicle driven using only electricity, and a hybrid electric vehicle is a vehicle driven using electricity and fossil fuels.

An electric vehicle is provided with a battery for supplying electricity for driving. In particular, a pure electric vehicle and a plug-in type hybrid electric vehicle charge a battery using power supplied from an external power source, and drive an electric motor using the electric power charged in the battery.

Also, recently, a mobility device is used as a concept including an electric vehicle, and the mobility device means a means of transportation or a means of transportation. Accordingly, the electric mobility device is a means for moving using electricity, and means a means for moving using an electric motor such as an electric vehicle, an electric kickboard, and an electric bicycle.

Recently, such electric mobility devices are rapidly increasing, and the use of general electric devices including various portable terminals (eg, laptops, smart phones, etc.) is also rapidly increasing. Accordingly, various charging infrastructures are being built that allow users to easily and quickly charge at their current location. In terms of efficiency, rather than building a dedicated charging infrastructure that can only charge one electric device (e.g. an electric vehicle), it is possible to charge multiple electric devices (e.g., electric mobility, general electric devices, etc.) in common (or both). We are building a charging infrastructure that allows

However, since the plug part of the electric vehicle uses the upper part as a control signal for charging and the lower part as the ground, the upper part and the lower part must be separated and inserted into the outlet. As such, when inserting the plug part of the electric vehicle into the outlet part, there is an inconvenience of always checking the direction of the plug part.

The background technology of the present invention is disclosed in Korean Patent Publication No. 2016-0109529 (published on September 21, 2016, title of the invention: vehicle charging device).

According to one aspect of the present invention, the present invention was created to solve the above problems, and using a 220VAC commercial outlet, an electric mobility device including an electric vehicle or a kickboard, and a general electric device including a portable terminal. To provide a common charging device capable of charging an electric vehicle, a plug and an outlet for charging an electric vehicle, to prevent erroneous insertion of the plug part when the plug part of the electric vehicle is inserted into the outlet part of the common charging device that can be charged in common. it has its purpose

In a common charging device capable of charging an electric vehicle according to an aspect of the present invention, a plug unit is inserted, an outlet unit for supplying power to the plug unit, and an outlet unit for transmitting a control signal for charging an electric vehicle, according to the control of the control unit, the a relay switch for supplying power to the plug, and the control unit for controlling the relay switch by sensing a plug inserted into the outlet according to whether the control signal is detected, wherein the outlet unit includes the plug unit insertable An outlet body portion having a concave shape so as to be formed, a plug pin connection portion formed in the outlet body portion and into which the plug pin of the plug portion is inserted, an outlet grounding terminal formed in the outlet body portion and connected to the ground, and the outlet body portion and an outlet control terminal connected to the control unit to transmit the control signal, and first and second guide grooves formed on an inner wall of the outlet body, wherein the shape of the first guide groove and the second guide groove can be characterized as being different.

In the present invention, when the plug part is a plug part connected to an electric vehicle, the plug part includes a plug body part on which a cable part connected to the electric vehicle is mounted, a pair of plug pin parts mounted on the plug body part, and the plug body part. It is formed and includes a plug grounding terminal connected to the ground, a plug control terminal connecting the cable part and the pair of plug pin parts to transmit a control signal, and first and second guide parts protruding from the outside of the plug body part. , The first guide part has a shape corresponding to the shape of the first guide groove part to be inserted into the first guide groove part, and the second guide part has a shape corresponding to the shape of the second guide groove part to be inserted into the second guide groove part It may be in shape.

In the present invention, the outlet part is connected to a cover for opening and closing the plug pin connection part, a rotation pin for rotating the cover, and the rotation pin, and when the plug part is separated from the outlet part, the cover is connected to the plug pin connection part. It may further include a pressing member for pressing the cover so as to cover.

In the present invention, when a control signal is sensed through the outlet control terminal, the controller enters a designated electric vehicle charging sequence and outputs power for charging the electric vehicle to the plug unit.

A plug according to another aspect of the present invention includes a plug body part on which a cable part connected to an electric vehicle is mounted, a pair of plug pin parts mounted on the plug body part, a plug grounding part formed on the plug body part and connected to the ground a terminal, a plug control terminal connecting the cable part and the pair of plug pin parts to transmit a control signal, and first and second guide parts protruding outside the plug body part, wherein the first guide part and the first guide part are provided. 2 The shape of the guide part is characterized in that it is different.

The outlet according to another aspect of the present invention includes an outlet body having a concave shape so that a plug part can be inserted, a plug pin connection part which is formed in the outlet body part, and a plug pin of the plug part is inserted, and the outlet body part is formed and an outlet grounding terminal connected to the ground, formed in the outlet body, an outlet control terminal connected to the control unit to transmit the control signal, and first and second guide grooves formed in the inner wall of the outlet body However, it is characterized in that the shape of the first guide groove portion and the second guide groove portion are different.

A common charging device capable of charging an electric vehicle according to an aspect of the present invention, and a plug and an outlet of the charging device, can prevent erroneous insertion of the plug when inserting the electric vehicle plug into the outlet of the common charging device.

A public charging device capable of charging an electric vehicle according to another aspect of the present invention, a plug and an outlet of the charging device, use a 220VAC commercial outlet to provide an electric mobility device including an electric vehicle or a kickboard and general electricity including a portable terminal Allow devices to be charged in public.

1 is an exemplary view showing a schematic configuration of an electric vehicle charging apparatus according to an embodiment of the present invention.
2 is a diagram schematically illustrating a common charging device capable of charging an electric vehicle according to an embodiment of the present invention.
3 and 4 are exemplary views for explaining the outlet unit and the plug unit shown in FIG. 2 .
5 is an exemplary view of an outlet unit according to another embodiment of the present invention.
6 is an exemplary diagram schematically shown to explain the mounting position and shape of a common charging device capable of charging an electric vehicle according to an embodiment of the present invention.

Hereinafter, an embodiment of a common charging device capable of charging an electric vehicle according to the present invention, a plug of the charging device, and an outlet will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is an exemplary view showing a schematic configuration of an electric vehicle charging apparatus according to an embodiment of the present invention.

As shown in FIG. 1 , the electric vehicle charging device according to the present embodiment includes a power supply unit 50 , an outlet unit 10 , a voltage sensing unit 20 , a relay switch 30 , a control unit 40 and a driving unit. It includes a charging cable 80 as well as a voltage converter 60 .

The power supply unit 50 supplies the mobilely charged power or supplies power through self-generation.

The outlet unit 10 has a structure of a 220VAC commercial outlet, and supplies power to a pair of plug pin connecting units 13 , and ground terminals 11 and 12 disposed in a vertical direction with the pair of plug pin connecting units 13 . ) of the first ground terminal 11 is grounded, and is connected to transmit a control signal (eg, a CP signal for communication through electric vehicle charging) to the second ground terminal 12 .

That is, in the 220VAC commercial outlet, the pair of grounding terminals 11 and 12 are commonly connected, but in this embodiment, the pair of grounding terminals 11 and 12 are electrically separated from each other, and the first grounding terminal 11 is grounded, and the second ground terminal 12 is connected to the control unit 40 to transmit a control signal (eg, a CP signal for communication through charging of an electric vehicle).

The charging cable 80 has one end connected to the charging gun 90 for the electric vehicle and the other end connected to the plug unit 70 for connecting to the outlet unit 10 of the charging device, thereby providing a control signal between the electric vehicle and the charging device. transmits and receives electricity to charge the electric vehicle through a 220VAC commercial outlet.

The third grounding terminal 71 of the pair of grounding terminals 71 and 72 in the plug part 70 is grounded, and the fourth grounding terminal 72 is connected to the control terminal of the charging gun 90, and the pair of the plug pin 73 is provided and is connected to a pair of plug pin connection parts 13 of the outlet part 10, and power is supplied therethrough.

The voltage sensing unit 20 senses the voltage level of the control signal from the second ground terminal 12 of the outlet unit 10 and provides it to the control unit 40 .

Here, the control signal may be a CP (Control Pilot) control signal according to the J1772 standard, and the voltage level of the control signal means a square wave upper voltage of the CP control signal.

The relay switch 30 supplies power from the power supply unit 50 to the outlet unit 10 under the control of the control unit 40 . Here, the relay switch 30 may be configured as an NC (Normal Close) type, and may be driven on/off during charging control of an electric vehicle.

The control unit 40 outputs a control signal to the second ground terminal 12 of the outlet unit 10, receives the voltage level of the control signal from the voltage sensing unit 20, and according to the voltage level of the control signal, the relay switch ( 30) to supply power to charge the electric vehicle.

On the other hand, when a plug of a general electric device (eg, home electric appliance) is inserted, a ground voltage is sensed also at the second ground terminal 12 because a pair of ground terminals are commonly connected to each other.

As such, when the voltage level of the control signal is received from the voltage sensing unit 20 and the voltage level is the first voltage or the ground voltage, the control unit 40 is not connected to the electric vehicle through the charging cable 80 or a general electric device. It is determined that (eg, home appliance) is connected, and the relay switch 30 is turned on to receive power from the power supply unit 50 from a general electric device (eg, home appliance).

However, if the electric vehicle plug part 70 is inserted in a reversed direction, the ground terminals 11 and 12 of the outlet part 10 to which the ground terminals 71 and 72 of the plug part 70 are connected are changed. This causes a problem that the voltage sensing unit 20 cannot detect the control signal. Therefore, it is necessary to prevent the electric vehicle plug 70 from being inserted into the outlet 10 by changing the vertical direction. Accordingly, in the present invention, reference is made to FIG. 2 for a structure in which the vertical direction of the plug part 70 for an electric vehicle is changed so that it is not inserted into the outlet part 10 .

On the other hand, when the electric vehicle and the outlet unit 10 are connected through the charging cable 80 and the control signal output from the control unit 40 is transmitted to the electric vehicle through the second ground terminal 12 of the outlet unit 10, The electric vehicle lowers the voltage level of the control signal to a second voltage of 9V by changing the internal resistance to prepare for charging. At this time, when the voltage level is lowered to the second voltage of 9V, the control unit 40 turns off the relay switch 30 to prepare for charging.

Afterwards, when the electric vehicle is ready for charging, if the internal resistance is further changed, the voltage level of the control signal is lowered to the third voltage of 6V, so the control unit 40 determines that the electric vehicle is ready for charging and switches the relay switch By turning on (30), the power of the power supply unit 50 is supplied to the electric vehicle through the outlet unit 10 to charge the electric vehicle.

When the charging of the electric vehicle is completed in this way and the voltage level of the control signal rises to the second voltage of 9V by changing the internal resistance in the electric vehicle, the control unit 40 changes the voltage level of the control signal to the second voltage. As it rises, the relay switch 30 is turned off to cut off the power supply, and when the plug part 70 of the charging cable 80 is removed from the outlet part 10 and the voltage level rises to the first voltage, the relay switch Turn on (30) to initialize.

The driving voltage converter 60 may convert the power of the power supply unit 50 into a driving voltage for driving the controller 40 and supply it to the controller 40 .

As described above, according to the charging device for an electric vehicle according to an embodiment of the present invention, the electric vehicle is charged through a 220VAC commercial outlet provided in the charging device, or a general electric device having a grounding terminal in the plug (eg: electrical appliances) so that it can be used.

2 is a view schematically showing a common charging device capable of charging an electric vehicle according to an embodiment of the present invention, FIGS. 3 and 4 are exemplary views for explaining the outlet unit and the plug unit shown in FIG. 2, FIG. 5 is It is an exemplary view of an outlet unit according to another embodiment of the present invention.

Referring to FIG. 2 , a common charging device capable of charging an electric vehicle according to an embodiment of the present invention includes a power supply unit 50 , an outlet unit 10 , a voltage sensing unit 20 , a relay switch 30 , and a control unit ( 40 ), a driving voltage conversion unit 60 , a plug unit 70 , and a cable unit 80 .

Hereinafter, in FIG. 2, a description of the constituent means overlapping with the constituent means shown in FIG. 1 will be omitted, and only the outlet unit 10 and the plug unit 70 of the electric vehicle having a difference will be described.

The outlet unit 10 has a plug unit 70 inserted thereinto, supplies power to the plug unit 70 , and transmits a control signal for charging the electric vehicle.

The outlet portion 10 includes an outlet body portion 15, a plug pin connection portion 13, an outlet grounding terminal 11, an outlet control terminal 12, a first guide groove portion 16, and a second guide groove portion 17. includes

The outlet body 15 has a concave shape so that the plug 70 can be inserted thereinto. For example, a portion of the outlet body 15 may be formed with an outlet groove 111 for insertion of the plug body 75 . The outlet body 15 may include a resin material that is an insulating material.

The plug pin connection portion 13 is formed in the outlet body portion 15 , and the plug pin of the plug portion 70 is inserted thereinto. For example, the pair of plug pin connection parts 13 may be connected to the plug pin part 73 so as to transmit an electric signal, a metal material that is a conductive material may be embedded therein.

The outlet ground terminal 11 is formed in the outlet body 15 and is connected to the ground.

The outlet control terminal 12 is formed in the outlet body 15 and is connected to the control unit 40 to transmit a control signal (eg, a CP signal for communication through charging an electric vehicle).

The first guide groove portion 16 and the second guide groove portion 17 are formed on the inner wall of the outlet body portion 15 . At this time, the first guide groove portion 16 and the second guide groove portion 17 may have different shapes so as not to be inserted into the outlet portion 10 by changing the vertical direction of the plug portion 70 for the electric vehicle, and a symmetrical position can be placed in For example, the first guide groove portion 16 and the second guide groove portion 17 may have different shapes, such as length, shape, shape, groove thickness, and the like.

For example, as shown in Figure 3, the first guide groove portion 16 may be formed on the inner wall of the outlet body portion 15 with a length L1, the second guide groove portion 17 has a longer length than the length L1. L2 of the outlet body 15 can be formed on the inner wall. In addition, as shown in FIG. 4 , the first guide groove 16 may be formed in a circular shape and the second guide groove 17 may be formed in a square shape on the inner wall of the outlet body 15 .

According to another embodiment of the present invention, the outlet unit 10 includes a cover 18 for opening and closing the plug pin connection 13 as shown in FIG. 5, a rotation pin 19 for rotating the cover 18, and a pressing member (not shown).

A rotation pin 19 is inserted into the cover 18 and the outlet body 15 so that the cover 18 is rotatably coupled to the outlet body 15 .

The rotation pin 19 penetrates the upper end of the outlet body 15 and the cover 18 so that the cover 18 rotates about the rotation pin 19 as an axis, so that the cover 18 is connected to the plug pin ( 13) can be opened and closed.

A pressing member may be coupled to the rotation pin 19 to have elasticity so that the cover 18 can be restored to a state covering the plug pin connection part 13 .

As the pressing member, a coil spring made of metal may be used, and the cover 18 is inserted into the rotation pin 19 so as to provide an elastic force in the direction in which the cover 18 covers the plug pin connection part 13 .

The plug part 70 includes the plug body part 75 , the plug pin part 73 , the plug ground terminal 71 , the plug control terminal 72 , the first guide part 76 , and the second guide part 77 . include

The plug body part 75 is equipped with a cable part connected to the electric vehicle. As an example, the plug body part 75 is made of a resin material that is an insulating material, and a part thereof may have a cylindrical shape.

A pair of plug pin portions 73 are mounted on the plug body portion 75 . For example, the plug pin part 73 may have a cylindrical shape, and may include a metal material as a conductive material to transmit an electric signal.

The plug ground terminal 71 is formed on the plug body part 75 and is connected to the ground.

The plug control terminal 72 connects the cable part and the pair of plug pin parts 73 to transmit a control signal.

The first guide part 76 and the second guide part 77 protrude outside the plug body part 75 . For example, the first guide part 76 and the second guide part 77 may be integrally formed with the plug body part 75 and disposed at symmetrical positions.

The first guide part 76 may have a shape corresponding to the shape of the first guide groove part 16 to be inserted into the first guide groove part 16 , and the second guide part 77 may have a second guide groove part 17 . It may have a shape corresponding to the shape of the second guide groove portion 17 to be inserted into the .

For example, as shown in FIG. 3 , when the length L1 of the first guide groove portion 16 and the length L2 of the second guide groove portion 17 are, the first guide portion 76 may protrude by the length L1. and the second guide part 77 may protrude by a length L2. In addition, as shown in FIG. 4 , when the first guide groove portion 16 is circular and the second guide groove portion 17 is rectangular, the first guide portion 76 can be inserted into the first guide groove portion 16 . It may protrude circularly so that the second guide part 77 may protrude in a quadrangular shape so as to be insertable into the second guide groove part 17 .

By configuring the outlet unit 10 and the plug unit 70 as described above, the vertical direction of the plug unit 70 for an electric vehicle is changed and inserted into the outlet unit 10 can be prevented.

6 is an exemplary diagram schematically shown to explain the mounting position and shape of a common charging device capable of charging an electric vehicle according to an embodiment of the present invention.

As shown in FIG. 6 , the common charging device capable of charging an electric vehicle according to the present embodiment may be mounted on a pillar portion of a street lamp (or traffic light). Because 220VAC power is already supplied to streetlights (or traffic lights), it is easy to install. However, the mounting position is merely exemplary and is not limited thereto, and may be mounted on an outer wall or column of a building, or may be installed as a separate facility. In addition, it may be mounted in plurality to the pillar portion of the street lamp (or traffic light).

Therefore, the public charging device capable of charging an electric vehicle according to this embodiment does not require a separate space and can be installed using facilities around the road (eg, street lights, traffic lights, etc.), so a charging infrastructure is built in downtown areas. It has an easy effect. However, since the facilities around the road (eg, street lights, traffic lights, etc.) are installed outdoors, there is a possibility of a short circuit depending on the weather.

Accordingly, in this embodiment, a sealing cover is attached to the outlet unit 10 to prevent the risk of such a short circuit, and the body is mounted in a watertight structure to facilities around the road (eg, street lights, traffic lights, etc.), The payment and authentication unit operates in a wireless communication (eg, Bluetooth, NFC, WiFi, etc.) method. In this case, the payment and authentication unit further adds a display means (eg, LED, LCD, etc.) for displaying the power supply state and payment information.

On the other hand, when the sealing cover (Cover) does not use electricity, when the specified weather (eg, rain, snow), and when moisture (or water) is detected in the outlet unit 10, the outlet unit ( 10) improves safety by blocking the entrance to prevent water from entering the inside.

As described above, the common charging device capable of charging an electric vehicle according to an aspect of the present invention, the plug and the outlet of the charging device can prevent erroneous insertion of the plug part when inserting the electric vehicle plug part into the outlet part of the common charging device. have.

A common charging device capable of charging a train vehicle according to another aspect of the present invention, a plug and an outlet of the charging device, use a 220VAC commercial outlet to provide an electric mobility device including an electric vehicle or a kickboard, and general electricity including a portable terminal Allow devices to be charged in public.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is merely exemplary, and various modifications and equivalent other embodiments are possible therefrom by those of ordinary skill in the art. will understand the point. Therefore, the technical protection scope of the present invention should be defined by the following claims. Also, the implementations described herein may be implemented as, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Although discussed only in the context of a single form of implementation (eg, discussed only as a method), implementations of the discussed features may also be implemented in other forms (eg, as an apparatus or program). The apparatus may be implemented in suitable hardware, software and firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a computer, a microprocessor, a processing device, including an integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants (“PDAs”) and other devices that facilitate communication of information between end-users.

10: outlet part
11: outlet ground terminal
12: outlet control terminal
13: plug pin connection part
15: outlet body
16: first guide groove
17: second guide groove
18 : cover
19: rotation pin
20: voltage sensing unit
30: relay switch
40: control unit
50: power supply
60: drive voltage conversion unit
70: plug part
71: plug grounding terminal
72: plug control terminal
73: plug pin part
75: plug body
76: first guide unit
77: second guide unit

Claims (6)

an outlet unit inserted into the plug unit, supplying power to the plug unit, and transmitting a control signal for charging an electric vehicle;
a relay switch for supplying power to the plug unit under the control of the controller; and
In accordance with whether the control signal is sensed, including the control unit for controlling the relay switch by detecting the plug inserted into the outlet unit,
The outlet unit,
an outlet body having a concave shape so that the plug can be inserted;
a plug pin connection part formed on the outlet body and into which the plug pin of the plug part is inserted;
an outlet grounding terminal formed on the outlet body and connected to the ground;
an outlet control terminal formed in the outlet body and connected to the control unit to transmit the control signal; and
Including first and second guide grooves formed on the inner wall of the outlet body,
A common charging device capable of charging an electric vehicle, characterized in that the shape of the first guide groove portion and the second guide groove portion are different.
According to claim 1,
When the plug part is a plug part connected to an electric vehicle,
The plug part,
a plug body on which a cable connected to the electric vehicle is mounted;
a pair of plug pin parts mounted on the plug body part;
a plug ground terminal formed on the plug body and connected to the ground;
a plug control terminal connecting the cable part and the pair of plug pin parts to transmit a control signal; and
Comprising first and second guide portions protruding outside the plug body portion,
The first guide part has a shape corresponding to the shape of the first guide groove part to be inserted into the first guide groove part, and the second guide part has a shape corresponding to the shape of the second guide groove part to be inserted into the second guide groove part. A common charging device capable of charging an electric vehicle, characterized in that it is.
According to claim 1,
The outlet unit,
a cover for opening and closing the plug pin connection part;
a rotation pin for rotating the cover; and
Common charging capable of charging an electric vehicle, characterized in that it further comprises a pressing member connected to the rotation pin and pressing the cover so that the cover can cover the plug pin connection part when the plug part is separated from the outlet part Device.
According to claim 1,
The control unit is
When a control signal is detected through the outlet control terminal,
A common charging device capable of charging an electric vehicle, characterized in that it enters a designated electric vehicle charging sequence and outputs power for charging the electric vehicle to the plug unit.
a plug body on which a cable connected to an electric vehicle is mounted;
a pair of plug pin parts mounted on the plug body part;
a plug ground terminal formed on the plug body and connected to the ground;
a plug control terminal connecting the cable part and the pair of plug pin parts to transmit a control signal; and
Comprising first and second guide portions protruding outside the plug body portion,
The plug, characterized in that the shape of the first guide portion and the second guide portion are different.
an outlet body having a concave shape so that the plug can be inserted;
a plug pin connection part formed on the outlet body and into which the plug pin of the plug part is inserted;
an outlet grounding terminal formed on the outlet body and connected to the ground;
an outlet control terminal formed in the outlet body and connected to the control unit to transmit the control signal; and
Including first and second guide grooves formed on the inner wall of the outlet body,
The shape of the first guide groove portion and the second guide groove portion are different from each other.

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