KR20210124798A - Electric vehicle charging device and control method therefor - Google Patents

Abstract

The present invention relates to an electric vehicle charging system comprising: a charger main body; a charging gun which has a connector for charging an electric vehicle; a charging cable which connects the charger main body and the charging gun; a winding reel which is mounted on the charger main body, and unwinds or winds the charging cable to take out or take in the charging cable; an actuating unit which actuates the winding reel; a cable sensor which detects a length of the charging cable, taken out or in from the winding reel, by measuring the charger main body and the charging gun; and a control unit which controls the actuating unit by receiving a detection signal from the cable sensor, to control the length of the charging cable. The electric vehicle charging system prevents the charging cable from dragging on the floor or being entangled.

Description

Electric vehicle charging system and control method thereof

The present invention relates to an electric vehicle charging system having a charging cable winding device capable of automatically winding a charging cable, and a method for controlling the same.

Recently, as the number of transportation methods using so-called electricity such as electric bicycles and electric buses as well as electric vehicles increase, charging infrastructure is emerging as the most important eco-friendly business.

An electric vehicle receives power from a charger, stores it in a battery, and is driven by using the battery as a power source.

However, in the related art, after the battery charging of the electric vehicle is completed, the cable is left unattended and dragged or twisted on the floor. For this reason, a phenomenon in which the cable is damaged may occur or there is a risk of a safety accident.

KR 10-2018-0116020 A (published on October 24, 2018; hereinafter, Patent Document 1) discloses an electric vehicle charging device installed on a pole for controlling the extension length of a charging cable and a method for controlling an electric vehicle charging device installed on the pole.

The electric vehicle charging device installed on the electric pole of Patent Document 1 may include a sensor for detecting whether the charger is mounted on the cradle, and may control fixing or rotation of the reel around which the charging cable is wound based on the detection result of the sensor.

However, Patent Document 1 does not have a sensor for detecting the length of the charging cable, so it does not suggest how long to wind the charging cable or how much to unwind.

Due to this, there is a limitation in that the cable is not fundamentally solved the problem of being dragged or twisted on the floor.

The present invention was created to solve the problems of the prior art, and it is a first object to provide an electric vehicle charging system and a control method thereof, which can fundamentally solve the problem that the charging cable is dragged or twisted on the floor.

In addition, a second object of the present invention is to provide an electric vehicle charging system and a method for controlling the same, which can automatically prepare for charging when the charging gun approaches an electric vehicle to increase the driver's convenience.

In order to achieve the first object described above, an electric vehicle charging system according to the present invention includes a charger body; A charging gun having a connector for charging an electric vehicle; a charging cable connecting the charger body and the charging gun; a winding reel mounted on the charger body, for unwinding or winding the charging cable so that the charging cable can be drawn out or retracted; a driving unit for driving the winding reel; a cable sensor that measures the distance between the charger body and the charging gun to detect the length of the charging cable drawn out or drawn in from the winding reel; and a control unit configured to receive a sensing signal from the cable sensor and control the driving unit to control the length of the charging cable.

According to an example related to the present invention, the cable sensor may be installed in the charging gun.

According to an example related to the present invention, the cable sensor may measure a distance to a sensor unit built in the charger body.

According to an example related to the present invention, the cable sensor may be a distance measuring sensor that measures the distance by measuring the time when one of light, sound, and radio waves is transmitted to the measurement object, reflected and returned.

According to an example related to the present invention, the cable sensor may be a UWB sensor.

According to an example related to the present invention, the winding reel may include: a reel body that is rotatably installed on the charger body about a rotation axis, and on which the charging cable is wound; It may include protrusions formed to protrude from both ends of the reel body to prevent separation of the charging cable.

In order to achieve the second object described above, it is built into the electric vehicle for charging by moving to the charger body, further comprising a charging gun sensor for measuring the distance between the electric vehicle and the charging gun, between the electric vehicle and the charging gun When the distance of is within a preset value, the electric vehicle may be controlled to switch to the charging mode.

According to an example related to the present invention, the charging cable may further include a guide ring that is formed in a closed loop shape to pass through, and guides drawing out and inlet of the charging cable.

According to an example related to the present invention, the charger body may include a power converter for converting AC power to DC power and the charging gun in one case integrally.

According to an example related to the present invention, a power converter accommodated in the charger body, converting AC power into DC power; and a charging terminal including the charging gun, the winding reel, and the driving unit so that the power converter and the charging gun are separated.

In the control method of the electric vehicle charging system related to the present invention, in controlling an electric vehicle charging system including a charger body having a built-in power converter, a charging gun, and a charging cable connecting the charger body and the charging gun, using a cable sensor measuring a distance between the charging gun and the charger body; determining whether the measured value of the distance between the charging gun and the charger body measured in real time using the cable sensor increases or decreases; unwinding the charging cable from the winding reel using a winding reel configured to wind the charging cable and a driving unit for driving the winding reel when the measured value of the distance between the charging gun and the charger body increases; and winding the charging cable around the winding reel when the measured value of the distance between the charging gun and the charger body decreases.

According to an example related to the control method of the electric vehicle charging system of the present invention, before the step of measuring the distance between the charging gun and the charger body, the step of waiting until the power converter is ready for charging when the electric vehicle starts charging ; and determining whether the charging gun and the electric vehicle are connected. When the charging gun and the electric vehicle are connected, the distance may be measured.

According to an example related to the control method of the electric vehicle charging system of the present invention, before the step of measuring the distance between the charging gun and the charger body, when the charging of the electric vehicle is terminated, the power converter until the electric vehicle is charged waiting; And further comprising the step of determining whether the charging gun is returned to the charger body, if the charging gun is not returned to the charger body, the distance can be measured.

According to an example related to the control method of the electric vehicle charging system of the present invention, before the step of measuring the distance between the charging gun and the charger body, the power converter waits until the electric vehicle moving toward the charger body stops to do; detecting whether there is a charging gun around the electric vehicle using a charging gun sensor built into the electric vehicle; measuring a distance between the charging gun and the electric vehicle by using the charging gun sensor when there is the charging gun around the electric vehicle; determining whether the measured value of the distance between the charging gun and the electric vehicle measured in real time using the charging gun sensor increases or decreases; notifying the driver that the charging mode is entered when the measured value of the distance between the charging gun and the electric vehicle decreases; and opening the charging port cover of the electric vehicle to prepare for charging.

According to an example related to the control method of the electric vehicle charging system of the present invention, the step of notifying that the charging mode is entered may notify the driver by using a horn or a light.

The effects of the electric vehicle charging system and the control method thereof according to the present invention will be described as follows.

First, the distance between the charging gun and the charger body is measured, and the winding reel on which the charging cable is wound is installed in the charger body, and based on this, the winding reel is controlled to control the winding reel of the charger body, so that the charging is extended so that it can be drawn in and out of the winding reel of the charger body. By adjusting the length of the cable, the problem of the charging cable being dragged or tangled on the floor can be fundamentally solved.

Second, by adjusting the length of the charging cable, it is possible to prevent the charging cable from being left on the floor after charging is finished, and to prevent a safety accident that may occur due to abrasion of the charging cable, thereby increasing the stability of the electric vehicle charging system.

Third, by measuring the distance between the charging gun and the electric vehicle, when the charging gun approaches the electric vehicle, it is automatically prepared for charging, thereby increasing the convenience of the driver.

Fourth, the guide ring surrounds the charging cable and guides the charging cable so that the charging cable is wound or unwound on the winding reel, the spring elastically supports the guide ring, and the charging cable is wound while the charging cable is wound along the winding groove of the winding reel. By pulling, the charging cable can be drawn out and drawn into the winding reel in the vertical direction, and by allowing the charging cable to move along the left and right longitudinal directions of the winding reel without sagging, the movement for pulling out and entering the charging cable can be smoothly maintained. .

1 is a block diagram showing an electric vehicle charging system according to the present invention.
2 is a conceptual diagram illustrating an integrated electric vehicle charging system according to the present invention.
3 is a conceptual diagram showing a state in which the winding reel in which the charging cable is wound in FIG. 2 is installed in the charger body.
Figure 4 is a front view of the charging gun in Figure 3;
5 is a side view showing a state in which the cable sensor is installed on the side of the charging gun in FIG. 4 .
6 is a conceptual diagram for explaining the principle of the UWB sensor according to the present invention.
7 is a conceptual diagram showing a detachable charger body according to another embodiment of the present invention.
8 is a flowchart illustrating a control method of an electric vehicle charging system when starting electric vehicle charging according to the present invention.
9 is a flowchart illustrating a method of controlling an electric vehicle charging system when terminating electric vehicle charging according to the present invention.
10 is a flowchart illustrating a control method of an electric vehicle charging system for electric vehicle charging secretion according to the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a block diagram showing a charging system for an electric vehicle 10 according to the present invention.

2 is a conceptual diagram illustrating an integrated electric vehicle 10 charging system according to the present invention.

FIG. 3 is a conceptual diagram illustrating a state in which the winding reel 114 on which the charging cable 120 is wound is installed in the charger body 100 in FIG. 2 .

4 is a front view of the charging gun 121 in FIG. 3 .

5 is a side view showing a state in which the cable sensor 122 is installed on the side of the charging gun 121 in FIG. 4 .

6 is a conceptual diagram for explaining the principle of the UWB sensor according to the present invention.

The electric vehicle 10 charging system according to the present invention includes a charger body 100 , a charging gun 121 , and a charging cable 120 .

The charger body 100 may form the exterior of the charger.

The charger body 100 may be formed in a stand-shaped rectangular parallelepiped shape.

The charger body 100 may include a power converter 110 and a control unit 130 .

The charger body 100 may be configured as an integral type in which the power converter 110 and the charging gun 121 are provided in one case, or may be configured as a separate type in which the power converter 110 and the charging gun 121 are separated. This embodiment shows the integrated charger body 100 .

The power converter 110 may be connected to the distribution line 1 . The distribution line 1 is a wire line that transmits electricity from a distribution substation to a house, a store, a factory, or a charging station, which is a consumption area.

The power converter 110 is a device for converting AC power supplied from the distribution line 1 into DC power to be stored in a battery.

The power converter 110 includes a filter, an AC-DC converter, and a DC-DC converter.

The filter may be connected to the distribution line (1). The filter is configured to remove harmonic components of the input AC power supply.

The AC-DC converter is configured to convert an AC voltage to a DC voltage.

The DC-DC converter is configured to step-up or step-down the DC voltage to a DC voltage suitable for storage in the battery.

The power converter 110 may be configured in one or a plurality of pieces. 1 shows an example in which the electric vehicle 10 charging system of the present invention is configured with one power converter 110 .

2 shows an example in which the electric vehicle 10 charging system of the present invention is configured with a plurality of power converters 110 .

The plurality of power converters 110 may be respectively connected in parallel to a plurality of first branch circuits branched from the input terminal of the distribution line 1 . The plurality of power converters 110 may include first to Nth power converters 110 . N is a natural number greater than or equal to 2.

The control unit 130 may be connected to the power converter 110 to enable bidirectional communication. The control unit 130 is configured to control the power converter 110 .

After the AC power supplied from the distribution line 1 is distributed to the plurality of power converters 110 , the DC power respectively converted by the plurality of power converters 110 is integrated again and distributed to the plurality of charging guns 121 . can

A plurality of first switches 111 and a plurality of second switches 112 may be disposed between the power converter 110 and the charging gun 121 .

The first switch 111 may be connected to an output terminal of the power converter 110 . A plurality of first switches 111 may be connected in parallel to the power converter 110 in a one-to-one correspondence.

The plurality of first switches 111 may selectively turn on/off the N DC power sources converted by each of the plurality of power converters 110 . Accordingly, it is possible to adjust the size of the amount of power converted by the plurality of power converters (110).

A plurality of first branch circuits each extending in the current flow direction from the plurality of first switches 111 may be connected to one junction point, and the junction circuit may be branched into a plurality of second branch circuits.

The plurality of second switches 112 may be disposed in parallel in each of the plurality of second branch circuits.

The plurality of second switches 112 may be disposed on the downstream side of the first switch 111 based on the current flow direction.

The plurality of second switches 112 may turn on/off the second branch circuit. According to this, the plurality of second switches 112 selectively turn on/off the plurality of second branch circuits to distribute the power flowing in the merging circuit to the plurality of charging guns 121 through the plurality of second branch circuits. have.

The control unit 130 may be configured to include a charging control board 119 . The charge control board 119 may be communicatively connected to the power converter 110 in both directions through CAN, Ethernet, or the like.

The charge control board 119 may be unidirectionally communicatively connected to the plurality of first switches 111 and the plurality of second switches 112 through a general purpose input output (GPIO).

Accordingly, the charging control board 119 may control the power converter 110 and the first and second switches 112 .

A speaker, a touch screen, an emergency stop button, a credit card slot, and an RFID may be provided in the charger body 100 as the user interface 113 .

Accordingly, a user such as a driver may input information about charging the electric vehicle 10 or check current charging state information, etc. through the user interface 113 .

The charging cable 120 is configured to electrically connect the charger body 100 and the charging gun 121 .

A plurality of charging cables 120 may be connected to one charger body 100 .

The plurality of charging guns 121 may be respectively provided at the ends of the plurality of charging cables 120 .

According to this configuration, the plurality of electric vehicles 10 can be simultaneously or continuously charged through the plurality of charging guns 121 . In addition, the charging standby time of the electric vehicle 10 is shortened.

The charging gun 121 may include a housing 1211 and a handle portion 1213 .

The housing 1211 has an accommodation space for accommodating the connector 1212 therein. An opening may be formed at one side of the housing 1211 .

The connector 1212 may be composed of one or a plurality of connectors. In this embodiment, one connector 1212 is accommodated in the housing 1211 .

The connector 1212 may be configured to use any one method selected from the ‘DC Combo’ method, the ‘CHAdeMO’ method, and the ‘AC3 phase’ method.

When the plurality of connectors 1212 are configured to be accommodated in the housing 1211, the plurality of connectors 1212 have different types depending on the automobile manufacturer, for example, a 'DC Combo' method, a 'CHAdeMO' method, ' AC3 phase 'can be configured to be applied in the form of each.

A plurality of connectors 1212 may be rotatably installed inside the housing 1211 .

By selectively exposing one connector 1212 of the plurality of connectors 1212 to the outside through the opening of the housing 1211, any one of the 'DC Combo' method, the 'CHAdeMO' method, and the 'AC3 phase' method can be made available.

According to this configuration, the charging gun 121 may be used for various types of connector 1212 structures according to automobile manufacturers.

The connector 1212 may be configured to use DC power or AC power.

The handle portion 1213 is formed at the rear of the receiving portion. The handle portion 1213 may be formed in a cylindrical shape so as to be wrapped by a hand of a driver or the like.

An end of the charging cable 120 passes through the handle portion 1213 and is electrically connected to the connector 1212 .

The connector 1212 is configured to be connected to a charging port of the electric vehicle 10 . According to this configuration, as the connector 1212 of the charging gun 121 and the charging port of the electric vehicle 10 are connected, the battery of the electric vehicle 10 can be charged.

The charging gun holder 101 may be formed to mount the charging gun 121 on the charger body 100 . The charging gun holder 101 may be formed to be recessed from the charger body 100 .

The present invention is configured to include a winding reel 114 , a driving unit 115 , a cable sensor 122 and a sensor unit 116 to solve the problem that the charging cable 120 is dragged or twisted on the floor.

The winding reel 114 may be rotatably mounted to the lower portion of the charger body 100 .

The winding reel 114 mounting portion may be recessed. The winding reel 114 may be rotatably mounted to the winding reel 114 mounting unit.

The winding reel 114 may include a reel body 1141 and a plurality of protrusions 1142 .

The reel body 1141 may be formed in a cylindrical shape so that the charging cable 120 is wound. A winding groove 1143 in the reel body 1141 may extend in a spiral direction along the longitudinal direction.

The winding groove 1143 guides the winding position of the charging cable 120 so that the charging cable 120 can be uniformly wound around the reel body 1141 in the longitudinal direction.

The plurality of protrusions 1142 may be formed to protrude radially outward from both ends of the winding reel 114 . The protrusion 1142 may be configured in a disk shape.

The protrusion 1142 may prevent the charging cable 120 wound along the winding groove 1143 of the reel body 1141 from being separated from the reel body 1141 .

A rotating shaft may be installed in the center of the reel body 1141 . The rotating shaft is configured to rotate together with the reel body 1141 . The winding reel 114 is configured to rotate about an axis of rotation.

The rotating shaft is rotatably mounted to the winding reel 114 mounting portion with respect to the charger body 100 . Both ends of the rotating shaft may be rotatably supported by bearings.

The driving unit 115 may include an electric motor and a gearbox. The gearbox may be composed of a plurality of gears to adjust the rotational speed of the electric motor. The gearbox is configured to transmit the rotational force of the electric motor to the winding reel 114 .

The electric motor is configured to be rotatable in forward and reverse directions. Depending on the rotational direction of the electric motor, the charging cable 120 may be wound around the winding reel 114 or the charging cable 120 may be unwound from the winding reel 114 .

The control unit 130 controls the driving unit 115 to rotate the winding reel 114 to adjust the length of the charging cable 120 drawn out from the winding reel 114 or the charging cable 120 drawn into the winding reel 114 . ) can be adjusted.

The gearbox may be connected to the rotating shaft to transmit power to the rotating shaft.

The sensor unit 116 may be installed in the charger body 100 . The sensor unit 116 may be configured to measure a distance between the charger body 100 and the charging gun 121 .

The sensor unit 116 may be configured as a distance measuring sensor.

The cable sensor 122 is made to measure the distance between the charger body 100 and the charging gun 121 .

The cable sensor 122 may be installed on the side of the housing 1211 of the charging gun 121 .

The cable sensor 122 may be implemented as a distance measuring sensor.

The sensor unit 116 and the cable sensor 122 may be selectively applied or both may be applied. In this embodiment, both are shown in the applied form.

The distance measuring sensor transmits a medium such as light, sound, radio wave, etc. to the measurement object and when it is reflected back from the measurement object, measures the reciprocating movement time of the medium and multiplies the speed of the medium to measure the distance.

Depending on the type of energy used by the medium, the distance measuring sensor is an ultrasonic sensor (sound wave), an infrared sensor (infrared), a LIDAR sensor (laser), a radar (RADAR) sensor (radio wave), and a camera sensor (visible light). can be classified as

Each of the cable sensor 122 and the sensor unit 116 may be implemented as an ultra-wideband (UWB) sensor.

UWB is a wireless communication technology that transmits a large amount of information using a wide frequency band with low power.

The UWB sensor is configured to transmit a signal using UWB and receive a reflected signal to measure the position of the measurement object.

The measurement principle of the UWB sensor will be described with reference to FIG. 6 as follows.

The signal moves from the starting point Node A to the arrival point Node B, and the travel time is measured after being reflected from the arrival point and returning back to the starting point.

The time taken for the signal to travel from the starting point to the destination point can be called tp.

There is a time table to the left of the departure point and to the right of the arrival point respectively.

“00:05” displayed in the time table means 00 minutes 05 seconds.

TroundA as seen from the starting point is (00:05-00:00), and TreplyB as seen from the arrival point is (00:07-00:04).

t _P can be obtained by the following formula.

Therefore, _{calculating t P} is 1 second. By multiplying this by the speed of the signal (medium), the distance between the measurement objects can be obtained.

The cable sensor 122 built in the charging gun 121 may measure a distance with the sensor unit 116 built in the charger body 100 .

According to this configuration, the cable sensor 122 can measure the distance between the charging gun 121 and the charger body 100 .

The controller 130 may receive a sensing signal from the cable sensor 122 to control the driving unit 115 .

For example, the controller 130 controls the driving unit 115 to rotate the winding reel 114 in the forward direction, so that as the distance between the charging gun 121 and the charger body 100 increases, the winding reel 114 in the winding reel 114 increases. The length of the charging cable 120 drawn out may be increased.

Conversely, the controller 130 rotates the winding reel 114 in the reverse direction as the distance between the charging gun 121 and the charger body 100 increases, thereby controlling the charging cable 120 to be wound around the winding reel 114 . can do.

The charging gun sensor 11 may be mounted inside the electric vehicle 10 .

The charging gun sensor 11 may be implemented as a UWB sensor.

The charging gun sensor 11 may measure a distance between the electric vehicle 10 and the charging gun 121 . Also, the electric vehicle 10 may detect whether the charging gun 121 is positioned around the electric vehicle 10 using the charging gun sensor 11 .

A guide ring 117 may be provided on the charger body 100 .

The guide ring 117 may be formed in a closed loop shape to surround the charging cable 120 . The guide ring 117 is formed to have a larger diameter than the diameter of the charging cable 120 .

The charging cable 120 may pass through the guide ring 117 .

The guide ring 117 may be disposed to be spaced apart from the upper portion of the winding reel 114 .

The guide ring 117 is configured to guide the movement of the charging cable 120 that is drawn out and inserted into the winding reel 114 .

The guide ring 117 may be elastically supported by the spring 118 on the charger body 100 .

One side of the spring 118 may be connected to be supported by the charger body 100 , and the other side of the spring 118 may be connected to the guide ring 117 to support the guide ring 117 .

The spring 118 elastically supports the guide ring 117 and pulls the charging cable 120 while the charging cable 120 is wound along the winding groove 1143 of the winding reel 114, so that the charging cable 120 ) can be drawn out and drawn into the winding reel 114 in the vertical direction, and by allowing the charging cable 120 to move along the left and right longitudinal direction of the winding reel 114 without sagging, draw-out of the charging cable 120 to keep the movement smooth.

7 is a conceptual diagram showing a detachable charger body 100 according to another embodiment of the present invention.

This embodiment is different from the above-described embodiment of FIGS. 1 to 6 in that the charger body 100 is configured as a separate type in which the power converter 110 and the charging gun 121 are separated.

The charger body 100 accommodates the power converter 110 , the plurality of first switches 111 , and the charge control board 119 .

A charging terminal 240 is further provided separately from the charger body 100 . A plurality of charging terminals 240 may be disposed. The plurality of charging terminals 240 may be configured to correspond to the plurality of charging guns 121 in one-to-one correspondence.

The plurality of charging terminals 240 may be composed of first to Mth charging terminals 240 .

The charging terminal 240 includes a second switch 112 , a cooler 241 , a charging gun 121 , a user interface board 242 , a user interface 113 such as a speaker, a winding reel 114 , and a driving unit 115 . , a sensor unit 116 and the like are provided.

The thinner the charging cable 120, the better. This is because, when the charging cable 120 is thin, the weight of the charging cable 120 is reduced, making it easier for the user to carry the charging gun 121 .

However, when the charging cable 120 is thin, if the current flowing along the charging cable 120 is large, heat is generated by the resistance, so the charging cable 120 needs to be cooled.

To this end, the cooler 241 is installed on the charging cable 120 to cool the charging cable 120 .

The cooler 241 may be disposed between the second switch 112 and the charging gun 121 .

The second switch 112 may be accommodated one by one in the charging terminal 240 to be connected to the charging gun 121 .

The user interface board 242 is capable of bidirectional communication using the charging control board 119 provided in the charger body 100 and CAN, Wifi, and the like.

The user interface board 242 of the charging terminal 240 is capable of bidirectional communication with the user interface board 242 of the other charging terminal 240 .

The user interface board 242 may be configured to send a signal to the second switch 112 .

The user interface board 242 may be configured to send or receive control signals to the winding reel 114 , the driving unit 115 , and the sensor unit 116 to control them.

Since other configurations are the same as or similar to those of the above-described embodiments of FIGS. 1 to 6 , a redundant description will be omitted.

8 is a flowchart illustrating a control method of the electric vehicle 10 charging system when starting charging the electric vehicle 10 according to the present invention.

The electric vehicle 10 moves to a charging station and prepares to start charging (S00).

The power converter 110 of the charging system waits until the preparation for charging the electric vehicle 10 is completed ( S01 ). The electric vehicle 10 opens the charging port for charging.

When the electric vehicle 10 is ready to be charged, it is checked whether the charging gun 121 and the electric vehicle 10 are connected (S02). It is checked whether the connector 1212 of the charging gun 121 and the connector 1212 provided in the charging port of the electric vehicle 10 are connected.

Whether the charging gun 121 and the electric vehicle 10 are connected can be checked using a sensor.

When the charging gun 121 and the electric vehicle 10 are connected, the control of the charging system is terminated (S03).

When the charging gun 121 and the electric vehicle 10 are not connected, the cable sensor 122 built in the charging gun 121 measures the distance with the sensor unit 116 built in the charger body 100, so that charging The distance between the gun 121 and the charger body 100 is measured (S10).

The control unit 130 receives a signal from the cable sensor 122 and measures the distance between the charging gun 121 and the charger body 100 in real time. The measured distance value is stored in a memory mounted on the charge control board 119 .

The control unit 130 determines whether there is a change in the distance between the charging gun 121 and the charger body 100 (S11).

By measuring the distance between the charging gun 121 and the charger main body 100 at a preset time interval (eg, 0.1 to 1.0 seconds), it is possible to determine whether the change in the measured distance value increases or decreases over time.

The control unit 130 receives a signal from the cable sensor 122 and determines whether the distance between the charging gun 121 and the charger body 100 increases (S12).

When the distance between the charging gun 121 and the charger body 100 increases, that is, when the measured distance increases, the winding reel 114 is rotated in the forward direction to release the charging cable 120 (S13).

When the distance between the charging gun 121 and the charger body 100 is close, that is, when the measured distance value decreases, the winding reel 114 is rotated in the reverse direction to wind the charging cable 120 (S14).

Then, the steps S10 to S14 are repeated until the charging gun 121 and the automatic vehicle are connected.

9 is a flowchart illustrating a control method of the electric vehicle 10 charging system when the electric vehicle 10 charging is terminated according to the present invention.

The electric vehicle 10 waits until charging ends at the charging station (S00).

The power converter 110 of the electric vehicle 10 charging system waits until charging of the electric vehicle 10 is completed ( S01 ).

It is checked whether the charging gun 121 is returned to the charger body 100 (S02). This can be confirmed depending on whether the charging gun 121 is mounted on the cradle 101 of the charger body 100 .

Whether the charging gun 121 is returned can be checked using a sensor.

If the charging gun 121 is returned, the control of the charging system is terminated (S03).

If the charging gun 121 is not returned, the cable sensor 122 built in the charging gun 121 measures the distance with the sensor unit 116 built in the charger body 100, so that the charging gun 121 and the distance between the charger body 100 is measured (S10).

The control unit 130 receives a signal from the cable sensor 122 and measures the distance between the charging gun 121 and the charger body 100 in real time. The measured distance value is stored in a memory mounted on the charge control board 119 .

The control unit 130 determines whether there is a change in the distance between the charging gun 121 and the charger body 100 (S11).

By measuring the distance between the charging gun 121 and the charger main body 100 at a preset time interval (eg, 0.1 to 1.0 seconds), it is possible to determine whether the change in the measured distance value increases or decreases over time.

The control unit 130 receives a signal from the cable sensor 122 and determines whether the distance between the charging gun 121 and the charger body 100 increases (S12).

When the distance between the charging gun 121 and the charger body 100 increases, that is, when the measured distance increases, the winding reel 114 is rotated in the forward direction to release the charging cable 120 (S13).

When the distance between the charging gun 121 and the charger body 100 is close, that is, when the measured distance value decreases, the winding reel 114 is rotated in the reverse direction to wind the charging cable 120 (S14).

Then, the above steps S10 to S14 are repeated until the charging gun 121 is returned.

10 is a flowchart showing a control method of the electric vehicle 10 charging system for preparing the electric vehicle 10 charging according to the present invention.

The electric vehicle 10 moves to a charging station to prepare for charging (S00).

The power converter 110 of the electric vehicle 10 charging system waits until the electric vehicle 10 is stopped (S01).

It is detected whether the charging gun 121 is around the electric vehicle 10 (S02). This is possible by measuring the distance between the charging gun sensor 11 built in the electric vehicle 10 and the cable sensor 122 built in the charging gun 121 .

If the charging gun 121 is not around the electric vehicle 10, the control of the charging system is terminated (S08).

If the charging gun 121 is around the electric vehicle 10, the charging gun sensor 11 built in the electric vehicle 10 measures the distance with the cable sensor 122 built in the charging gun 121, so that the charging gun The distance between ( 121 ) and the electric vehicle 10 is measured ( S03 ).

The control unit 130 receives a signal from the charging gun sensor 11 and measures the distance between the charging gun 121 and the electric vehicle 10 in real time. The measured distance value is stored in a memory mounted on the charge control board 119 .

The control unit 130 determines whether there is a change in the distance between the charging gun 121 and the electric vehicle 10 (S04).

By measuring the distance between the charging gun 121 and the electric vehicle 10 at a preset time interval (eg, 0.1 to 1.0 seconds), it may be determined whether the change in the measured distance value increases or decreases over time.

The control unit 130 receives a signal from the charging gun sensor 11 and determines whether the distance between the charging gun 121 and the electric vehicle 10 approaches ( S05 ).

When the distance between the charging gun 121 and the electric vehicle 10 approaches, the driver is notified through a horn or a light that the electric vehicle 10 enters the charging mode (S06).

The controller 130 may control the horn or light to inform the electric vehicle 10 of entering the charging mode through bidirectional communication with a BMS (BATTERY MANAGEMENT SYSTEM) or CPU (CONTROL PROCESSESOR UNIT) built in the electric vehicle 10 .

Then, the electric vehicle 10 opens the charging port cover (S07).

When the opening of the charging port cover is completed, preparation for charging the electric vehicle 10 is completed ( S08 ).

Therefore, according to the present invention, the distance between the charging gun 121 and the charger body 100 is measured, and the winding reel 114 on which the charging cable 120 is wound is installed in the charger body 100, and based on this By controlling the winding reel 114 by adjusting the length of the charging cable 120 extending in and out from the winding reel 114 of the charger body 100, the charging cable 120 is dragged or twisted on the floor. The problem can be fundamentally solved.

In addition, by adjusting the length of the charging cable 120, the charging cable 120 is prevented from being left on the floor after charging is finished, and a safety accident that may occur due to abrasion of the charging cable 120 is prevented to charge the electric vehicle 10 The stability of the system can be improved.

In addition, by measuring the distance between the charging gun 121 and the electric vehicle 10, when the charging gun 121 approaches the electric vehicle 10, charging preparation is automatically performed, thereby increasing the convenience of the driver.

first embodiment
1: distribution line 10: electric vehicle
11: charging gun sensor 100: charger body
101: cradle 110: power converter
111: first switch 112: second switch
113 user interface 114 winding reel
1141: reel body 1142: protrusion
1143: winding groove 115: driving unit
116: sensor unit 117: guide ring
118: spring 119: charge control board
120: charging cable 121: charging gun
1211: housing 1212: connector
1212: handle 122: cable sensor
130: control unit
second embodiment
240: charging terminal 241: cooler
242: user interface board

Claims (15)

charger body;
A charging gun having a connector for charging an electric vehicle;
a charging cable connecting the charger body and the charging gun;
a winding reel mounted on the charger body, for unwinding or winding the charging cable so that the charging cable can be drawn out or retracted;
a driving unit for driving the winding reel;
a cable sensor that measures the distance between the charger body and the charging gun to detect the length of the charging cable drawn out or drawn in from the winding reel;
and a control unit configured to receive a sensing signal from the cable sensor and control the driving unit to control the length of the charging cable. According to claim 1,
The cable sensor is an electric vehicle charging system installed in the charging gun. According to claim 1,
The cable sensor is an electric vehicle charging system for measuring a distance with a sensor unit built into the charger body. According to claim 1,
The cable sensor is a distance measuring sensor that measures the distance by measuring the time when one of light, sound, and radio waves is transmitted to the measurement object, reflected and returned. According to claim 1,
The cable sensor is a UWB sensor for an electric vehicle charging system. According to claim 1,
The winding reel is
a reel body that is rotatably installed on the charger body about a rotation axis, and on which the charging cable is wound;
and protrusions formed to protrude from both ends of the reel body to prevent separation of the charging cable. According to claim 1,
When the distance between the electric vehicle and the charging gun is within a preset value, it is built into the electric vehicle for charging by moving to the charger body, and further comprising a charging gun sensor measuring a distance between the electric vehicle and the charging gun. An electric vehicle charging system in which the electric vehicle is controlled to switch to a charging mode. According to claim 1,
The electric vehicle charging system further comprising a guide ring formed in a closed loop shape to allow the charging cable to pass therethrough, and for guiding withdrawal and entry of the charging cable. According to claim 1,
The charger body is an electric vehicle charging system including a power converter for converting AC power to DC power and the charging gun in one case. According to claim 1,
a power converter accommodated in the charger body and converting AC power into DC power; and
The electric vehicle charging system further comprising a charging terminal including the charging gun, the winding reel, and the driving unit so that the power converter and the charging gun are separated. In the control method of an electric vehicle charging system comprising a charger body with a built-in power converter, a charging gun, and a charging cable connecting the charger body and the charging gun,
measuring a distance between the charging gun and the charger body using a cable sensor;
determining whether the measured value of the distance between the charging gun and the charger body measured in real time using the cable sensor increases or decreases;
unwinding the charging cable from the winding reel using a winding reel configured to wind the charging cable and a driving unit for driving the winding reel when the measured value of the distance between the charging gun and the charger body increases; and
and winding the charging cable around the winding reel when the measured value of the distance between the charging gun and the charger body decreases. 12. The method of claim 11,
Before the step of measuring the distance between the charging gun and the charger body, the step of waiting until the power converter is ready for charging when the electric vehicle starts charging; and
Further comprising the step of determining whether the charging gun and the electric vehicle are connected,
A control method of an electric vehicle charging system for measuring the distance when the charging gun and the electric vehicle are connected. 12. The method of claim 11,
Before the step of measuring the distance between the charging gun and the charger body, the step of waiting until the charging of the electric vehicle is finished by the power converter when the charging of the electric vehicle is finished; and
Further comprising the step of determining whether the charging gun is returned to the charger body,
A control method of an electric vehicle charging system for measuring the distance when the charging gun is not returned to the charger body. 12. The method of claim 11,
Before the step of measuring the distance between the charging gun and the charger body, the step of the power converter waiting until the electric vehicle moving toward the charger body stops;
detecting whether there is a charging gun around the electric vehicle using a charging gun sensor built into the electric vehicle;
measuring a distance between the charging gun and the electric vehicle by using the charging gun sensor when there is the charging gun around the electric vehicle;
determining whether the measured value of the distance between the charging gun and the electric vehicle measured in real time using the charging gun sensor increases or decreases;
notifying the driver that the charging mode is entered when the measured value of the distance between the charging gun and the electric vehicle decreases; and
and opening a charging port cover of the electric vehicle to prepare for charging. 15. The method of claim 14,
The step of notifying that the charging mode is entered is a control method of an electric vehicle charging system informing the driver using a horn or a light.

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