KR102357248B1 - Portable wireless charging apparatus - Google Patents

Abstract

The present invention relates to a mobile wireless charging device. Specifically, according to an embodiment of the present invention, there is provided a mobile wireless charging device capable of charging an electric vehicle equipped with a power receiver, comprising: a power transmitter capable of wirelessly transmitting power to the power receiver; an adjustment unit capable of adjusting at least one of a position and a tilt of the power transmitter; a body part which supports the adjustment part and which is movable; and a controller that receives information about charging of the electric vehicle from the electric vehicle and moves the power transmitter to an optimal position of the power transmitter so that the charging efficiency of the electric vehicle is maximized by controlling the controller , The controller may be provided with a mobile wireless charging device capable of controlling the controller so that the distance between the power transmitter and the power receiver is less than or equal to a predetermined range.

Description

Portable wireless charging device {PORTABLE WIRELESS CHARGING APPARATUS}

The present invention relates to a mobile wireless charging device.

Recently, research and development and commercialization of electric vehicles that store electricity in a battery and use it instead of a general engine vehicle using fossil fuels that generate a lot of soot are being actively conducted.

In order to charge the battery of such an electric vehicle, a contact-type charging device has been used. However, in the contact-type charging device, a connector of a cable for supplying electrical energy must be connected to a connector of an electric vehicle in order to charge a battery, and this connection process is very cumbersome and inconvenient.

In order to solve this problem, a wireless charging system for charging a battery mounted in an electric vehicle through electromagnetic induction has been developed, and this wireless charging system is known as the most convenient and efficient method among various charging systems.

On the other hand, the wireless charging system consists of a receiving pad installed under the vehicle body and a transmitting pad installed in a charging station. This is a way to charge the battery. However, in such a wireless charging system, if the receiving pad of the vehicle and the transmitting pad of the charging station are not aligned correctly or are far apart from each other, charging efficiency may be reduced. In addition, when the transmission pad of the charging station is installed, it is mainly buried in the ground, so it is expensive to build the infrastructure.

Accordingly, there is a need for a device capable of increasing wireless charging efficiency without incurring excessive costs to build a wireless charging system.

Embodiments of the present invention were invented based on the above background, moving the power transmitter so that the distance with the power receiver of the vehicle can be adjusted, and controlling the position of the power transmitter so that the power transmitter is located at the center of the power receiver. An object of the present invention is to provide a portable wireless charging device that can

Another object of the present invention is to provide a mobile wireless charging device capable of supplying power to several vehicles in different locations while moving the power transmitter.

According to an aspect of the present invention, there is provided a mobile wireless charging device capable of charging an electric vehicle equipped with a power receiver, comprising: a power transmitter capable of wirelessly transmitting power to the power receiver; an adjustment unit capable of adjusting at least one of a position and a tilt of the power transmitter; a body part which supports the adjustment part and which is movable; and a controller that receives information about charging of the electric vehicle from the electric vehicle and moves the power transmitter to an optimal position of the power transmitter so that the charging efficiency of the electric vehicle is maximized by controlling the controller , The controller may be provided with a mobile wireless charging device capable of controlling the controller so that the distance between the power transmitter and the power receiver is less than or equal to a predetermined range.

In addition, the controller may receive information on charging of the electric vehicle when the electric vehicle is in a charging state determined by at least one of a position and a slope of the electric vehicle to obtain charging efficiency of the electric vehicle, and Reference charging efficiency, which is charging efficiency when the power transmitter is placed in a predetermined position and placed in a reference charging state having a predetermined slope, and control charging in which at least one of the position and inclination of the power transmitter is changed compared to the reference charging state A mobile wireless charging device capable of performing search control for controlling the control unit to search for an optimal charging state in which charging efficiency is maximized while comparing control charging efficiency, which is charging efficiency in the state, may be provided.

In addition, the control unit controls the adjusting unit to move the power transmitting unit in at least one of a first direction, a second direction, and a third direction, and the power transmitting unit at one or more of the first direction and the second direction By moving in the direction, it is possible to provide a mobile wireless charging device capable of performing horizontal position control to search for an optimal horizontal position state in which the charging efficiency of the electric vehicle is maximized at a constant height.

In addition, the control unit controls the adjusting unit to move the power transmitting unit in at least one of a first direction, a second direction, and a third direction, and the control unit, the power transmitting unit in the first direction and the second direction By moving in one or more directions among directions, horizontal position control can be performed to search for an optimal horizontal position state in which the charging efficiency of the electric vehicle is maximized at a constant height, and by moving the power transmitter in the third direction, The vertical position control can be performed so that the distance in the third direction between the power transmitter and the power receiver is less than or equal to a predetermined range, and by rotating the power transmitter, the optimal inclination state in which the charging efficiency of the electric vehicle is maximized A mobile wireless charging device capable of performing a tilt control to search may be provided.

In addition, a plurality of detection units may be provided on one surface of the power transmitter, and the controller receives distance measurement values between the power transmitter and the power receiver measured from the plurality of detection units, and receives the distance measurement value An apparatus capable of determining whether the power transmitter and the power receiver are parallel by comparing them may be provided.

In addition, when it is determined that the power transmitter and the power receiver are parallel, the controller performs the vertical position control without performing the tilt control, a mobile wireless charging device may be provided.

In addition, the control unit, if it is determined that the power transmitter and the power receiver are not parallel, performing the vertical position control after performing the tilt control, a mobile wireless charging device may be provided.

In addition, the control unit performs any one of the horizontal position control, the vertical position control, and the inclination control, and when any one of the control ends, the horizontal position control, the vertical position control, and the inclination control A mobile wireless charging device may be provided to perform another control of the.

In addition, the control unit, the horizontal position control, the vertical position control and the inclination control can be simultaneously performed in order to search for the optimal charging state in which the charging efficiency is maximized, a mobile wireless charging device can be provided.

In addition, the diameter of the transmitter coil provided in the power transmitter is 0.8 times or more and 1.2 times or less of the diameter of the receiver coil provided in the power receiver, a mobile wireless charging device may be provided.

According to the embodiments of the present invention, charging efficiency is increased by minimizing the distance between the power transmitter and the power receiver and matching the center of the power transmitter with the center of the power receiver.

In addition, there is an effect that a plurality of vehicles disposed in different positions can be charged by moving one power receiver.

In addition, since it is movable and does not need to be buried in the ground, there is an effect that it does not cost much to construct the infrastructure.

1 is a side view conceptually showing that a mobile wireless charging device according to an embodiment of the present invention is charging an electric vehicle.
FIG. 2 is a plan view conceptually showing that the power transmitter of the mobile wireless charging device of FIG. 1 is horizontally position controlled to move toward the power receiver from the beginning.
3 is a plan view conceptually illustrating that the power transmitter of the mobile wireless charging device of FIG. 1 is horizontally position controlled to move toward the power receiver while initially moving in the opposite direction of the power receiver.
4 is a side view conceptually illustrating that the power transmitter of the mobile wireless charging device of FIG. 1 is vertically positioned toward the power receiver.
FIG. 5 is a side view conceptually showing that the power transmitter of the mobile wireless charging device of FIG. 1 is tilted to rotate toward the power receiver from the beginning.
6 is a side view conceptually illustrating that the power transmitter of the mobile wireless charging device of FIG. 1 is tilted to rotate toward the power receiver while initially rotating in the opposite direction of the power receiver.

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, when it is said that a component is 'connected', 'supported', 'supplied', or 'transferred' to another component, it may be directly connected, supported, supplied, or transmitted to the other component, but other components in the middle It should be understood that elements may exist.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

In addition, in the present specification, expressions such as front, rear, left, right, etc. are described with reference to the drawings in the drawings, and it is to be noted in advance that they may be expressed differently if the direction of the corresponding object is changed. Meanwhile, in the present specification, the first direction may be the x-axis direction of FIGS. 1 to 6 . In addition, the second direction may be the y-axis direction of FIGS. 1 to 6 , and the third direction may be the z-axis direction of FIGS. 1 to 6 . In the present specification, the front side may be the +y-axis direction in FIGS. 1 to 6, and the rear side may be the -y-axis direction in FIGS. In addition, the right side may be the +x-axis direction in FIGS. 1 to 6 , the left side may be the -x-axis direction, the upper side may be the +z-axis direction, and the lower side may be the -z-axis direction.

The mobile wireless charging device 2 according to an embodiment of the present invention may be used to wirelessly charge the electric vehicle 1 . Hereinafter, the electric vehicle 1 will be described.

First, referring to FIG. 1 , an electric vehicle 1 may be wirelessly charged by a mobile wireless charging device 2 . The electric vehicle 1 may include a power receiver 10 , a signal transmitter 20 , and a vehicle battery 30 .

The power receiver 10 may wirelessly receive power from the power transmitter 200 to be described later and transmit it to the vehicle battery 30 . For example, the power receiver 10 may be an electromagnetic coil panel. The power receiver 10 may be provided with a receiver coil 11 , and the receiver coil 11 may wirelessly receive power from a transmitter coil 210 to be described later by an electromagnetic induction method or a resonance method. The power receiver 10 may be installed in the electric vehicle 1 . For example, the power receiver 10 may be installed on the lower side of the electric vehicle 1 (eg, lower than the engine room), and may be installed on the front side of the electric vehicle 1 . However, in the present specification, the power receiver 10 is expressed as being installed on the lower side and the front side of the electric vehicle 1 , but this is only an example, and it is also possible to be installed on the upper side or the rear side of the electric vehicle 1 .

The signal transmitter 20 may transmit information about charging of the vehicle battery 30 to the mobile wireless charging device 2 . The information about such charging may be the capacity of the vehicle battery 30 , the degree of charging, charging speed, charging efficiency, and the like. In addition, the signal transmission unit 20 may be a one-way communication means for generating a signal in one direction toward the mobile wireless charging device 2, or a communication means that can communicate in both directions with the mobile wireless charging device 2 have.

The vehicle battery 30 may supply power to a driving unit (not shown) of the electric vehicle 1 for driving of the electric vehicle 1 . The vehicle battery 30 may be charged by power transmitted from the power receiver 10 . In addition, the vehicle battery 30 may receive power directly from the electric charging means through a plug (not shown) as well as the power receiver 10 .

Hereinafter, a specific configuration of the mobile wireless charging device 2 according to an embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1 , the mobile wireless charging device 2 may wirelessly charge the electric vehicle 1 . This mobile wireless charging device 2 can wirelessly charge the electric vehicle 1 wherever the electric vehicle 1 is. For example, a space in which the mobile wireless charging device 2 can be disposed to charge the electric vehicle 1 is possible wherever the electric vehicle 1 exists, such as a gas station, a parking lot, and a road. The mobile wireless charging device 2 may include a body part 100 , a power transmitter 200 , a controller 300 , a device battery 400 , a receiver 500 , and a controller 600 .

The body part 100 may configure the external shape of the mobile wireless charging device 2 , and may support the power transmitter 200 , the controller 300 , the receiver 400 , and the controller 500 . Also, the body part 100 may provide a space in which the device battery 400 and the controller 600 are accommodated. The body part 100 may be provided with a moving means 110 . These moving means 110 can move the body part 100 in the horizontal direction. In other words, the moving means 110 may be configured to be movable in forward, backward, left, and right directions. For example, the moving means 110 may be a wheel, and may be driven by a motor (not shown). In addition, other moving means having other well-known driving principles may be employed. The body part 100 may move toward the electric vehicle 1 through the moving means 110 . In addition, a known method may be used as a method of moving the body part 100 . For example, the body part 100 may be moved by a user or may be automatically moved toward the electric vehicle 1 by an autonomous driving function, and the present invention is not limited thereto.

The power transmitter 200 may wirelessly transmit power to the power receiver 10 . For example, the power transmitter 200 may be an electromagnetic coil panel. The power transmitter 200 may be provided with a transmitter coil 210 , and the transmitter coil 210 may wirelessly transmit power to the receiver coil 11 by an electromagnetic induction method or a resonance method. In addition, the diameter of the transmitter coil 210 may be 0.8 or more and 1.2 times or less of the diameter of the receiver coil 11 . The power transmitter 200 may receive power from a device battery 400 to be described later, and may be supported by the controller 300 . In addition, the power transmitter 200 may move in one or more of the first direction, the second direction, and the third direction by the adjusting unit 300 , and the inclination may be adjusted.

A sensing unit 220 may be provided on one surface of the power transmitter 200 . For example, the sensing unit 220 may be a distance sensor capable of measuring a distance to an object. The sensing unit 220 may be provided on one surface of the power transmitter 200 facing the power receiver 10 to measure the distance between the power transmitter 200 and the power receiver 10 . In addition, a plurality of detection units 220 may be provided, and the plurality of detection units 220 may be spaced apart from each other on one surface facing the power receiver 10 of the power transmitter 200 . For example, the plurality of sensing units 220 may be disposed at vertices or corners of the opposing surface of the power transmitter 200 , or may be disposed at the center of the power transmitter 200 . The distance measurement value between the power transmitter 200 and the power receiver 10 measured by the sensing unit 220 may be transmitted to the controller 600 .

The adjustment unit 300 may adjust the position and angle of the power transmitter 200 . The adjustment unit 300 may move the power transmitter 200 in one or more of the first direction, the second direction, and the third direction, and may adjust the angle of the power transmitter 200 . In addition, the driving of the control unit 300 may be controlled by the control unit 600 . The adjustment unit 300 may be supported by the body unit 100 . In addition, the adjusting unit 300 may include a first guide member 310 , a second guide member 320 , a third guide member 330 , and a tilting unit 340 .

The first guide member 310 can guide the movement of the tilting unit 340 in the first direction. The first guide member 310 may support the tilting part 340 . In addition, a wheel coupled to the second guide member 320 may be provided on the bottom surface of the first guide member 310 , and the wheel may be connected to a separate power source to rotate. In other words, by moving the first guide member 310 in the second direction on the second guide member 320 , the power transmitter 200 may be moved in the second direction. The movement of the first guide member 310 may be controlled by the controller 600 .

The second guide member 320 can guide the movement of the first guide member 310 in the second direction. The second guide member 320 may be supported on one side of the third guide member 310 . In addition, a wheel coupled to the third guide member 330 may be provided on one surface of the second guide member 320 , and the wheel may be connected to a separate power source to rotate. In other words, the second guide member 320 may move the power transmitter 200 in the third direction by moving on the third guide member 330 in the third direction. The movement of the second guide member 320 may be controlled by the controller 600 .

The third guide member 330 can guide the movement of the second guide member 320 in the third direction. The third guide member 330 may be supported by the body part 100 .

The tilting unit 340 may support the power transmitter 200 and may adjust an angle of the power transmitter 200 . In other words, the tilting unit 340 may rotate the power transmitting unit 200 so that the inclination of the power transmitting unit 200 with respect to a horizontal plane perpendicular to the direction of gravity is adjusted. The tilting unit 340 may also adjust the inclination of the power transmitting unit 200 so that the power transmitting unit 200 is completely parallel to the horizontal plane. The tilting unit 340 may adjust the inclination of the power transmitting unit 200 so that any one of the front side, the rear side, the left, and the right side of the power transmitting unit 200 moves downward and the opposite side faces upward. The tilting unit 340 may include, as an example, a ball, a cup rotatable on the ball, and a motor providing power for the cup to rotate, but as another example, a hinge for pivotally rotating the adjusting unit 200, and It may include a motor.

In addition, a wheel coupled to the first guide member 310 may be provided on the bottom surface of the tilting unit 340 , and the wheel may be connected to a separate power source to rotate. In other words, the tilting unit 340 may move the power transmitter 200 in the first direction by moving on the first guide member 310 in the first direction. The movement of the tilting unit 340 may be controlled by the controller 600 .

The device battery 400 may store power and transmit power to the power transmitter 200 . The device battery 400 may be supported on the inside of the body part 100 . Also, the device battery 400 may be connected to an external power source (not shown) for charging to receive power from the outside.

The receiver 500 may receive a signal generated by the signal transmitter 20 of the electric vehicle 1 . The receiver 500 may be a receiving device or a two-way communication means. Also, the receiver 500 may receive information about charging of the vehicle battery 30 from the signal transmitter 20 and transmit it to the controller 600 .

The controller 600 may control whether the power transmitter 200 is operated, and may control the operation of the controller 300 . The controller 600 may move the power transmitter 200 in one or more of the first direction, the second direction, and the third direction by controlling the controller 300 , and the inclination of the power transmitter 200 . can be adjusted. In addition, the control unit 600 may obtain charging efficiency by receiving information about charging from the receiver 500 in order to control the control unit 300 . For example, the control unit 600 may directly receive charging efficiency, such as a charging speed, from the receiver 500, or receive information about how much the battery 30 is charged (charged degree) from the receiver 500. It is also possible to calculate the charging efficiency. In addition, the control unit 600 receives the distance between the power transmitter 200 and the power receiver 10 from the sensing unit 220 and controls the inclination and the third direction of the power transmitter 200 through the controller 300 . position can be adjusted.

The control unit 600 may be implemented by an arithmetic device including a microprocessor and a memory, and since the implementation method is obvious to those skilled in the art, further detailed description thereof will be omitted. The arithmetic unit of the control unit 600 may calculate charging efficiencies and may compare information on a plurality of charging efficiencies. In addition, the memory of the controller 600 may store information on the charging state and charging efficiency at a specific inclination and a specific position of the power transmitter 200 .

The controller 600 may operate the power transmitter 200 when the body part 100 moves toward the front side of the electric vehicle 1 as shown in FIG. 1 . When a predetermined time elapses, the controller 600 may receive information about charging from the signal transmitter 20 and the receiver 500 of the electric vehicle 1 . Here, the charging efficiency received by the controller 600 is defined as the reference charging efficiency, and in this case, the position and the inclination of the power transmitter 200 are defined as the reference charging state. The control unit 600 may obtain a reference charge state through a memory or a sensor. In addition, the reference charging state may include location information and tilt information of the power transmitter 200 . The control unit 600 may store the reference charging efficiency and the reference charging state in the memory.

The control unit 600 determines the optimal charging state (optimal position state and optimal inclination state) in which the power transmitter 200 maximizes the charging efficiency of the vehicle battery 30 of the electric vehicle 1 through the reference charging efficiency and the reference charging state. Search control can be performed so that it is placed on . The search control of the controller 600 is a position control that moves the power transmitter 200 to a position where the charging efficiency of the car battery 30 is maximum and the power transmitter ( 200) may include a tilt control to adjust the tilt.

Hereinafter, position control among the search control of the controller 600 will be described in detail with reference to FIGS. 2 and 3 . Referring to FIG. 2 , the controller 600 may perform position control so that the power transmitter 200 is placed in an optimal position. This position control is a horizontal position control in which the controller 600 controls the position of the power transmitter 200 in the horizontal direction (the first direction and the second direction) and the position in the vertical direction (the third direction) of the power transmitter 200 . It may include a vertical position control to control the. By moving the power transmitter 200 in one or more of the first direction and the second direction through the control unit 600 horizontal position control, the optimum horizontal position state in which the charging efficiency of the electric vehicle 1 is maximized at a constant height is obtained. can explore. In addition, the controller 600 moves the power transmitter 200 in the third direction through vertical position control so that the distance between the power transmitter and the power receiver in the third direction is less than or equal to a predetermined range. ) can be controlled.

The controller 600 may move the power transmitter 200 in a horizontal direction, that is, in the front, rear, left, and right directions, through the adjusting unit 300 in order to perform horizontal position control. In other words, the control unit 600 moves the tilting unit 340 along the first guide member 310 to move the power transmitter 200 in the first direction (left and right in FIGS. 2 and 3). can In addition, the control unit 600 moves the first guide member 310 along the second guide member 320 to move the power transmitter 200 in the second direction (the front side and the rear side in FIGS. 2 and 3 ). can be moved to

Referring to FIG. 2 , the controller 600 controls the power transmitter 200 to perform horizontal position control on the premise that the power transmitter 200 is not placed directly below the power receiver 10 as shown in FIG. 200) can be moved in any direction (left in Fig. 2(b)). The control unit 600 provides information on charging of the electric vehicle 1 through the signal transmitter 20 and the receiver 500 of the electric vehicle 1 when a predetermined time elapses after the movement of the power transmitter 200 is terminated. can be delivered to obtain charging efficiency. In this case, the charging efficiency obtained by the controller 600 is defined as a control charging efficiency. In addition, the control unit 600 may acquire information on the position and inclination of the power transmitter 200 that has moved a predetermined distance through an internal memory or a sensor. In this case, the position and the inclination of the power transmitter 200 are defined as a control charging state. The control unit 600 may compare the pre-measured reference charging efficiency with the control charging efficiency.

When the control charging efficiency is greater than the reference charging efficiency, the control unit 600 determines that the moving direction of the power transmitter 200 to the control charging state is the correct direction, and the charging state of the power transmitter 200 in the same manner as in the previous prioritization process (Position, inclination) can be changed or modified. Accordingly, the control unit 600 moves the power transmitter 200 when the power transmitter 200 changes from the reference charging state to the control charging state so that the power transmitter 200 faces an optimal horizontal position state (eg, FIG. 2C ) to be described later. The power transmitter 200 may be further moved in the same direction as the moving direction (left in FIG. 2(b)) without changing the direction.

When a predetermined time elapses after the additional movement of the power transmitter 200 is completed, the controller 600 provides information on charging of the electric vehicle 1 through the signal transmitter 20 and the receiver 500 of the electric vehicle 1 . to obtain charging efficiency. Since the additional movement of the power transmitter 200 has ended, the control unit 600 defines the control charging state and the reference charging efficiency before the additional movement of the power transmitter 200 as a new reference charging state and a new reference charging efficiency. In addition, the control unit 600 defines the charging efficiency of the electric vehicle 1 after the additional movement is completed as a new reference charging efficiency, and the position and inclination state of the power transmitter 200 at this time are respectively defined as a new reference charging state. .

In addition, the control unit 600 moves the power transmitter 200 in the same direction until the defined control charging efficiency becomes less than or equal to the reference charging efficiency, and compares the newly defined reference charging efficiency with the newly defined reference charging efficiency. repeat the process

Meanwhile, since the controller 600 moves the power transmitter 200 in an arbitrary direction, the controller 300 may control the controller 300 to move the power transmitter 200 to a position opposite to the optimal horizontal position state. Hereinafter, with reference to FIG. 3 , a case in which the power transmitter 200 is initially controlled to move in a direction not toward the power receiver 10 (eg, in the opposite direction) will be described.

Referring to FIG. 3 , when the control charging efficiency of the power transmitter 200 moved in an arbitrary direction (eg, the right direction in FIG. 3B ) is less than or equal to the reference charging efficiency, the control unit 600 controls the control charging state It is determined that the moving direction of the power transmitter 200 to the furnace (the right direction in FIG. 3(b)) is incorrect, and the power transmitter 200 returns to the reference charging state (the state of FIG. 3(c)). In other words, the control unit 600 recognizes that the direction in which the power transmitter 200 moves is not the direction toward the optimal horizontal position when changing from the reference charging state to the control charging state, and sets the power transmitter 200 back to the reference charging state. move

Thereafter, the controller 600 may move the power transmitter 200 that has moved back to the reference charging state in a direction different from the wrong direction (the right side in FIG. 3B ). Here, the other directions mean left, front, and rear directions except for the right.

At this time, although not shown in the drawing, the control unit 600 moving in a different direction (eg, the front side in FIG. 3( c )) transmits information about charging of the electric vehicle 1 from the signal transmission unit 20 . and obtain a charging efficiency, and compare the new reference charging efficiency with the new reference charging efficiency. If the new control charging efficiency is smaller than the new reference charging efficiency again, the control unit 600 returns the power transmitter 200 back to the reference charging state (the state of FIG. 3(c)) and then moves it in another direction. can Here, another direction may be a left or a rearward direction other than the right and frontward directions moved once in the previous step. The control unit 600 determines a new control charging state and a new control charging efficiency based on the position of the power transmitter 200 moved in another direction (eg, the left side of FIG. 3(d)) as shown in FIG. 3(d). can be defined. In addition, the process of moving the power transmitter 200 and comparing the charging efficiencies is repeated a predetermined number of times until the new reference charging efficiency is greater than the new reference charging efficiency. The predetermined number of times may be four or more to include at least all of the front, rear, left, and right directions.

According to the horizontal position control, the control unit 600 moves the power transmitter 200 in the same direction until the new reference charging efficiency becomes less than or equal to the new reference charging efficiency, and sets the new reference charging efficiency defined again. Repeat the comparison with the new control charging efficiency. When the redefined new control charging efficiency is less than or equal to the new reference charging efficiency, the control unit 600 repeats the process of comparing the two by leaving the new reference charging efficiency as it is as described above and re-defining only the control charging efficiency again a predetermined number of times. do. When a charging state in which the control charging efficiency becomes greater than the reference charging efficiency is not found for the same reference charging efficiency, it is determined that the reference charging state is an optimal horizontal position state (the state of FIG. 4(d)), and the power transmitter 200 position can be maintained.

When the control unit 600 does not find a charging state in which the control charging efficiency becomes greater than the reference charging efficiency with respect to the same reference charging efficiency, the position of the power transmitter 200 at this time may be defined as an optimal horizontal position state. In addition, when the power transmitter 200 reaches the optimum horizontal position state, the controller 600 may end the horizontal position control and perform the vertical position control.

Hereinafter, vertical position control of the controller 600 will be described. The control unit 600 may move the power transmitter 200 that has reached the optimal horizontal position state in the vertical direction (third direction) to reach the optimal position state. Here, the optimal position state is a position extending in the third direction and maximizing the charging efficiency of the electric vehicle 1 on an imaginary line passing through the optimal horizontal position state.

The controller 600 may move the power transmitter 200 that has reached the optimal horizontal position state in the vertical direction through the third guide member 330 . The charging efficiency of the vehicle battery 30 charged through the power transmitter 200 may increase as the distance between the power transmitter 200 and the power receiver 10 is shorter. Accordingly, the controller 600 may raise the power transmitter 200 to be closer to the power receiver 10 . When the power transmitter 200 reaches the optimal horizontal position state, the controller 600 may receive information about the distance between the power transmitter 200 and the power receiver 10 from the detection unit 220 .

In addition, the computing device of the controller 600 may receive distance measurement values between the power transmitter 200 and the power receiver 10 from the plurality of detection units 220 and compare the measured distance values with each other. Here, the distance measurement value means a distance between the power transmitter 200 and the power receiver 10 measured from the sensing unit 220 .

The controller 600 may determine whether the inclinations of the power transmitter 200 and the power receiver 10 are the same on the premise that the power transmitter 200 is parallel to the ground, as shown in FIG. 4A . The controller 600 may move the power transmitter 200 to an optimal horizontal position state (eg, FIG. 4(b) ). In addition, when the power transmitter 200 of the controller 600 reaches the optimal horizontal position state, the distance measurement values may be transmitted from the sensing units 220 disposed at different positions of the power transmitter 200 . The control unit 600 compares the received distance measurement values and determines that the power transmitter 200 and the power receiver 10 are parallel if the distance measurement values are the same or within a predetermined error range. In addition, the control unit 600 compares the distance measurement values and determines that the power transmitter 200 and the power receiver 10 are not parallel if the distance measurement values are not the same and are out of a predetermined error range.

When the controller 600 determines that the power transmitter 200 and the power receiver 10 are in a parallel state, the distance between the power transmitter 200 and the power receiver 10 is less than or equal to a predetermined range, as shown in FIG. 4C . The power transmitter 200 may be raised through the third guide member 330 to become In addition, when the power transmitter 200 moves so that the distance from the power receiver 10 is less than or equal to a predetermined range, the control unit 600 determines the position of the power transmitter 200 ( FIG. 4( c )) as an optimal position state and , end search control.

Meanwhile, when it is determined that the power transmitter 200 and the power receiver 10 are not parallel, the controller 600 may perform tilt control. Hereinafter, the tilt control of the controller 600 will be described in detail with further reference to FIGS. 5 and 6 .

Referring to FIG. 5 , on the premise that the power transmitter 200 is not parallel to the power receiver 10 , the controller 600 tilts the power transmitter 200 through the tilting part 340 at a predetermined inclination. (200) can be rotated in any direction (rear side in Fig. 5(b)). The control unit 600 controls the charging of the vehicle battery 30 through the signal transmission unit 20 and the receiver 500 of the electric vehicle 1 when a predetermined time elapses after the rotation of the power transmission unit 200 is finished. It receives information and acquires charging efficiency. In this case, the charging efficiency obtained by the control unit is defined as the reference charging efficiency, and the position and the inclination of the power transmitter 200 are defined as the control charging state.

The control unit 600 compares the reference charging efficiency with the control charging efficiency, and when the control charging efficiency is greater than the reference charging efficiency, determines that the rotation direction of the power transmitter 200 in the control charging state is correct, and powers in the same manner as in the previous process. The charging state of the transmitter 200 is changed. In other words, when the control unit 600 changes from the reference charging state to the control charging state, the power transmitter 200 recognizes that the inclination direction is rotated in the direction toward the inclination in the optimal charging state, and rotates the power transmitter 200 . do not change direction Therefore, the control unit 600 is the same as the direction in which the power transmitter 200 rotates when changing from the reference charging state to the control charging state so that the power transmitter 200 is directed toward the slope in the optimal charging state as shown in FIG. 5( c ). Rotate the power transmitter 200 in the direction (rear side in FIG. 5(b)).

When a predetermined time elapses after the additional rotation of the power transmitter 200 is completed, the controller 600 provides information on charging of the electric vehicle 1 through the signal transmitter 20 and the receiver 500 of the electric vehicle 1 . to obtain charging efficiency. Since the additional rotation of the power transmitter 200 has ended, the control unit 600 defines the control charge state and the reference charging efficiency before the additional rotation of the power transmitter 200 as a new reference state of charge and the reference charging efficiency. In addition, the control unit 600 defines the charging efficiency of the electric vehicle 1 after the additional rotation is completed as a new reference charging efficiency, and the position and the inclination state of the power transmitter 200 at this time are respectively defined as the new reference charging state. .

In addition, the control unit 600 rotates the power transmitter 200 in the same direction until the redefined reference charging efficiency becomes less than or equal to the redefined reference charging efficiency, and sets the newly defined reference charging efficiency to the newly defined reference charging efficiency. Repeat the process of comparing with efficiency.

Meanwhile, since the controller 600 rotates the power transmitter 200 in an arbitrary direction, the controller 300 may control the controller 300 to rotate the power transmitter 200 to a position opposite to the optimal inclination state. Hereinafter, with reference to FIG. 6 , a case in which the power transmitter 200 is initially controlled to be rotated in a direction that does not face the power receiver 10 (eg, the opposite direction) will be described.

Referring to FIG. 6 , when the control charging efficiency of the power transmitter 200 rotated in an arbitrary direction (eg, the forward direction in FIG. 6( b )) is less than or equal to the reference charging efficiency, the control unit 600 controls the control charging It is determined that the rotation direction of the power transmitter 200 to the state (eg, the front side in FIG. 6( b )) is wrong and returns the power transmitter 200 to the reference charging state (state of FIG. 6( c )). make it In other words, the control unit 600 recognizes that the direction in which the power transmitter 200 rotates is not the direction toward the slope in the optimal charging state when changing from the reference charging state to the control charging state, and then resets the power transmitter 200 to the reference charging state. rotate to state.

Thereafter, the control unit 600 may rotate the power transmitter 200 in a direction different from the wrong direction (the forward direction in FIG. 6(c)) of the power transmitter 200 rotated back to the reference charging state. Here, the other directions may be rotated in the left, right, and rear directions except for the front side.

At this time, although not shown in the drawing, the control unit 600 rotated in a different direction (eg, the left side in FIG. 6( c )) receives information about the charging of the electric vehicle 1 from the signal transmission unit 20 . The charging efficiency may be obtained, and the new reference charging efficiency may be compared with the new reference charging efficiency. When the new control charging efficiency is less than the new reference charging efficiency, the control unit 600 may return the power transmitter 200 to the reference charging state ( FIG. 6( c )) and then rotate it in another direction. Here, another direction may be a rear side and a right direction except for the front side, the direction rotated once in the previous step, and the left direction. The control unit 600 may define a new control charging state and a new control charging efficiency based on the inclination of the power transmitter 200 rotated in another direction (eg, the rear side of FIG. 6( d )). In addition, the process of rotating the power transmitter 200 and comparing the charging efficiencies is repeated a predetermined number of times until the new reference charging efficiency is greater than the new reference charging efficiency. The predetermined number of times may be four or more to include at least all of the front, rear, left, and right directions.

The control unit 600 rotates the power transmitter 200 in the same direction until the new reference charging efficiency becomes less than or equal to the new reference charging efficiency according to the gradient control, and sets the new reference charging efficiency defined again as the new reference charging efficiency. Repeat the comparison with the control charging efficiency. When the redefined new control charging efficiency is less than or equal to the new reference charging efficiency, the control unit 600 repeats the process of comparing the two by leaving the new reference charging efficiency as it is as described above and re-defining only the control charging efficiency again a predetermined number of times. do. When a charging state in which the control charging efficiency becomes greater than the reference charging efficiency is not found for the same reference charging efficiency, it is determined that the reference charging state is an optimal charging state, and the power transmitter 200 is slope can be maintained.

When the control unit 600 does not find a charging state in which the control charging efficiency becomes greater than the reference charging efficiency with respect to the same reference charging efficiency, the slope of the power transmitter 200 at this time may be defined as an optimal slope state. In addition, when the power transmitter 200 reaches the optimum inclination state, the controller 600 may terminate the inclination control and perform vertical position control.

When the power transmitter 200 reaches the optimal inclination state (eg, the state of FIG. 5 ( c ) or FIG. 6 ( d )), the control unit 600 , between the power transmitter 200 and the power receiver 10 . The power transmitter 200 may be raised through the third guide member 330 as shown in FIG. 5(d) so that the distance of is less than or equal to a predetermined range. In addition, when the power transmitter 200 moves so that the distance from the power receiver 10 is less than or equal to a predetermined range, the control unit 600 determines the position of the power transmitter 200 as an optimal position state (FIG. 5(d)) and , end search control.

On the other hand, in the drawing according to the present embodiment, it has been described that the adjusting unit 300 moves the power transmitter 200 in the left and right directions, but this is only an exemplary description, and moving the power transmitter 200 in the front and rear directions is also described. It is possible. In addition, the control unit 600 may move the control unit 300 in any direction between the front-back direction and the left-right direction as well as the front, rear, left, and right directions. Similarly, it has been described that the adjusting unit 300 adjusts the inclination of the power transmitter 200 with respect to the horizontal plane along the front-rear and left-right directions. Since this is only an exemplary description, the spirit of the present invention is not limited thereto. Therefore, the adjusting unit 300 may be configured to adjust the inclination of the power transmitting unit 200 in any direction between the front-rear direction and the left-right direction.

In addition, although the controller 600 has been described as performing horizontal position control and tilt control and performing vertical position control, this is only an example, and after performing any one of horizontal position control, vertical position control, and inclination control, the other It is also possible to carry out In addition, it is also possible to re-perform any one of the horizontal position control, the vertical position control, and the inclination control. For example, the control unit 600 raises the power transmitter 200 after the horizontal position control and the inclination control has been completed through vertical position control, and then controls the horizontal position again before the power transmitter 200 reaches the optimal position state. Alternatively, tilt control may be performed. Meanwhile, the controller 600 may simultaneously perform horizontal position control, vertical position control, and tilt control.

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed as having the widest scope according to the basic idea disclosed in the present specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

1: Mobile wireless charging device 2: Electric vehicle
10: power receiving unit 11: receiving unit coil
20: signal transmitter 30: car battery
100: body part 110: transport means
200: power transmitter 210: transmitter coil
220: sensing unit 300: control unit
310: first guide member 320: second guide member
330: third guide member 340: tilting unit
400: device battery 500: receiver
600: control unit

Claims (12)

As a mobile wireless charging device provided to charge an electric vehicle equipped with a power receiver,
a power transmitter provided to wirelessly transmit power to the power receiver;
An adjustment unit provided to adjust at least one of a position and a tilt of the power transmitter, a horizontal guide member provided to guide horizontal movement of the power transmitter, and a vertical direction movement of the power transmitter provided to guide an adjustment unit including a vertical guide member and a tilting unit provided on the horizontal guide member to adjust the inclination of the power transmitter; and
A control unit that receives information about charging of the electric vehicle from the electric vehicle and controls the adjustment unit to move the power transmitter to an optimal position where the charging efficiency of the electric vehicle is maximized; and
The control unit controls the adjusting unit so that the distance between the power transmitting unit and the power receiving unit is less than or equal to a predetermined range,
The horizontal guide member,
a first guide member provided to guide movement of the power transmitter in a first direction extending in a left and right direction of the electric vehicle; and
a second guide member provided to guide the movement of the power transmitter in a second direction extending in the front-rear direction of the electric vehicle;
The tilting part is provided to be movable along the first guide member and the second guide member,
The power transmitter is rotatably coupled to the tilting unit,
Removable wireless charging device. The method of claim 1,
The tilting part is movably mounted to the first guide member,
Removable wireless charging device. The method of claim 1,
The first guide member is movably coupled to the second guide member,
Removable wireless charging device. The method of claim 1,
The diameter of the transmitter coil provided in the power transmitter is formed to be 0.8 times or more and 1.2 times or less of the diameter of the receiver coil provided in the power receiver,
Removable wireless charging device. As a mobile wireless charging device provided to charge an electric vehicle equipped with a power receiver,
a power transmitter provided to wirelessly transmit power to the power receiver;
An adjustment unit provided to adjust at least one of a position and a tilt of the power transmitter, a horizontal guide member provided to guide horizontal movement of the power transmitter, and a vertical direction movement of the power transmitter provided to guide an adjustment unit including a vertical guide member and a tilting unit provided on the horizontal guide member to adjust the inclination of the power transmitter; and
A control unit that receives information about charging of the electric vehicle from the electric vehicle and controls the adjustment unit to move the power transmitter to an optimal position where the charging efficiency of the electric vehicle is maximized; and
The control unit is
When the electric vehicle is placed in a charging state determined by at least one of a position and an inclination of the electric vehicle, information on charging of the electric vehicle is received to obtain charging efficiency of the electric vehicle,
Reference charging efficiency, which is charging efficiency when the power transmitter is placed in a predetermined position and placed in a reference charging state having a predetermined slope, and a comparison in which at least one of the position and inclination of the power transmitter is changed compared to the reference charging state Comparing the control charging efficiency that is the charging efficiency in the state of charge, search control for controlling the adjusting unit to search for an optimal state of charge in which the charging efficiency is maximized can be performed,
Removable wireless charging device. 6. The method of claim 5,
The control unit is
controlling the adjusting unit to move the power transmitting unit in at least one of a first direction, a second direction, and a third direction,
By moving the power transmitter in one or more of the first direction and the second direction, horizontal position control can be performed to search for an optimal horizontal position state in which the charging efficiency of the electric vehicle is maximized at a constant height,
Removable wireless charging device. 7. The method of claim 6,
The control unit is
By moving the power transmitter in the third direction, vertical position control can be performed so that the distance between the power transmitter and the power receiver in the third direction is less than or equal to a predetermined range,
By rotating the power transmitter, it is possible to perform tilt control to search for an optimal tilt state in which the charging efficiency of the electric vehicle is maximized,
Removable wireless charging device. 8. The method of claim 7,
A plurality of sensing units may be provided on one surface of the power transmitter,
The control unit is
It is possible to determine whether the power transmitter and the power receiver are parallel by receiving distance measurement values between the power transmitter and the power receiver measured from the plurality of sensing units and comparing the distance measurements,
Removable wireless charging device. 9. The method of claim 8,
The control unit is
When it is determined that the power transmitter and the power receiver are parallel, the vertical position control is performed without performing the tilt control,
Removable wireless charging device. 9. The method of claim 8,
The control unit is
If it is determined that the power transmitter and the power receiver are not parallel, performing the vertical position control after performing the tilt control,
Removable wireless charging device. 8. The method of claim 7,
The control unit is
Any one of the horizontal position control, the vertical position control, and the inclination control is performed, and when any one control is finished, another control of the horizontal position control, the vertical position control, and the inclination control is performed. ,
Removable wireless charging device. 8. The method of claim 7,
The control unit is
capable of simultaneously performing the horizontal position control, the vertical position control, and the inclination control in order to search for the optimal charging state in which charging efficiency is maximized,
Removable wireless charging device.

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