KR20170106008A - Wireless power transfer pad and ground assembly having the same - Google Patents

Abstract

Disclosed are a wireless power transmission pad used for an electric car wireless power transmission and a ground assembly having the same. The wireless power transmission pad comprises: a primary coil with a rectangular shape having the X-width defined in the x-direction and the Y-width defined by the y-direction, and having a central space; a ferrite connected with the primary coil; and a housing supporting the primary coil and the ferrite. A first cross-section area with respect to a first part of the primary coil having the X-width is smaller than a second cross-section area with respect to a second part of the primary coil having the Y-width.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission pad and a ground assembly having the wireless power transmission pad.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission pad, and more particularly, to a wireless power transmission pad used in an electric vehicle wireless power transmission and a ground assembly having the wireless power transmission pad.

J2954 is the capacity and performance of wireless power transmission system using magnetic induction method for electric vehicles, vertical and horizontal separation distance based on interoperability, rated output, transmission and reception pads It contains various contents such as communication method, operating frequency, EMI (electromagnetic interference) / electromagnetic compatibility (EMC), and stability.

Since this standard not only describes the performance but also the specification of the transmitting and receiving pads according to capacity, most automobile manufacturers follow the configuration and size of the transmitting and receiving pads presented in the specification when manufacturing the transmitting and receiving pads.

Since the numerical values given in the specification are not absolute values except for the external size, it is necessary to consider the optimum configuration method of the transmitting and receiving pad in order to maximize the performance. Thus, there is a need for an optimum configuration for a wireless power transmission pad.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless power transmission pad capable of maximizing wireless power transmission performance.

Another object of the present invention is to provide a ground assembly having the aforementioned wireless power transmission pad.

According to an aspect of the present invention, there is provided a wireless power transmission pad prepared to transmit wireless power to a receiving pad including a secondary coil, the wireless power transmitting pad comprising: A primary coil of a rectangular shape having a Y-width and having a central space, a ferrite for coupling with the primary coil, and a housing for supporting the primary coil and the ferrite, wherein the primary coil Is smaller than a second cross-sectional area for the second portion of the primary coil having the Y-width.

Here, the ratio of the first cross-sectional area to the second cross-sectional area may be 9/13.

The X-width may be greater than 80 mm and less than 100 mm, and the Y-width may be greater than 120 mm and less than 140 mm. The X-width may be 90 mm, and the Y-width may be 130 mm.

Here, the second ratio of the Y-width to the Y-length of the ferrite defined in the y-direction and the first ratio of the X-width to the X-length of the ferrite defined in the x- 0.0 > 0.21 < / RTI > 0.07.

The X2-width of the secondary coil defined in the x-direction is greater than 35 mm and smaller than 37 mm, and the Y2-width of the secondary coil defined in the y-direction is greater than 35 mm and smaller than 37 mm .

Here, the Y-width in the rectangular primary coil includes a first Y-width and a second Y-width disposed in the y-direction with the central space of the primary coil interposed therebetween, and the first Y- The size and the size of the second Y-width may be different. The size of either the first Y-width and the second Y-width may be the same as the X-width.

According to another aspect of the present invention for achieving the above object, there is provided a wireless power transmission pad prepared to transmit wireless power to a receiving pad including a secondary coil, the wireless power transmission pad comprising: A primary coil of a rectangular shape having a Y-width and having a central space, a ferrite for coupling with the primary coil, and a housing for supporting the primary coil and the ferrite, wherein the primary coil Sectional area of the insulating material at a second cross-sectional area of the first portion of the primary coil having the Y-width is less than a second area of the insulating material at a second cross- A transfer pad is provided.

Here, the average distance between two adjacent coils arranged in the x-direction in the cross section of the first part is smaller than the average distance between two coils adjacent to each other arranged in the y- It can be narrow.

Here, the ratio of the first cross-sectional area to the second cross-sectional area may be 9/13.

Here, the ferrite may have a structure that surrounds the primary coil and protrudes into a central space of the primary coil.

Here, the wireless power transmission pad may further include a metallic shield, and a laminated structure of the first insulating material, the ferrite, the second insulating material, and the primary coil may be disposed on the metallic shield.

Here, the outer shape thickness or vertical distance from the lower portion of the first insulating member located below the metallic shield to the upper portion of the primary coil in the laminated structure may be smaller than 40 mm.

Here, the windings of the second portion may have a multi-layer structure.

Here, the coils in the multi-layered winding can be arranged at regular intervals in the y-direction. Further, adjacent coils of the first layer in the multi-layer structure winding and mutually adjacent coils of the second layer may be arranged at different average intervals. Further, the coils in the winding of the multi-layer structure can be arranged so that the interval between two coils adjacent in the y-direction sequentially decreases or increases.

According to another aspect of the present invention, there is provided a ground assembly for a wireless power transmission system, comprising: a power conversion unit for converting power from a grid or a power source; and a wireless power transmission pad Wherein the wireless power transmission pad comprises: a rectangular-shaped primary coil having a X-width defined in the x-axis direction and a Y-width defined in the y-axis direction and having a central space, Wherein the first cross-sectional area for the first portion of the primary coil having the X-width is less than the second cross-sectional area for the second portion of the primary coil having the Y-width, do.

Here, the first area of the insulating material within the first cross-sectional area may be smaller than the second area of the insulating material within the second cross-sectional area.

In the case of using the wireless power transmission pad and the ground assembly having the same according to the embodiment of the present invention as described above, the wireless power transmission performance between the transmitting and receiving coils in the wireless power transmission system can be maximized.

Further, it is possible to provide a transmission pad having a thin outer shape and excellent coupling performance, thereby improving the wireless power transmission efficiency in a wireless power transmission system.

Fig. 1 is a conceptual diagram for the x / y axis defined in SAE J2954, which can be employed in this embodiment.
2 is a configuration diagram of a transmission pad according to a SAE J2954 standard according to a comparative example.
3 is a block diagram of a receiving pad according to a SAE J2954 standard according to a comparative example.
4 is a graph illustrating a coupling performance between the transmitting and receiving pads according to a comparative example.
5 is a plan view of a wireless power transmission pad (hereinafter simply referred to as a transmission pad) according to an embodiment of the present invention.
Figure 6 is a left side view of the transmission pad of Figure 5;
Figure 7 is a front view of the transmission pad of Figure 5;
8 is a partially enlarged front view of the transmission pad of Fig.
FIG. 9 is an exemplary view of experimental conditions for obtaining the coil width condition of the transmission pad of FIG. 5; FIG.
10 is a graph showing the coupling coefficient according to the x-axis separation distance in the experimental conditions of FIG.
11 is a graph showing the coupling coefficient according to the y-axis separation distance in the experimental conditions of FIG.
12 is a graph of the x-axis spacing coupling coefficient in a state where the z-axis spacing distance is fixed at the first distance in the experimental conditions of Fig.
13 is a graph of the y-axis separation coupling coefficient in a state where the z-axis separation distance is fixed at the first distance in the experimental conditions of Fig.
FIG. 14 is a graph of the x-axis spacing coupling coefficient in a state where the z-axis spacing distance is fixed at the second distance in the experimental conditions of FIG.
15 is a graph of the y-axis separation coupling coefficient in a state where the z-axis separation distance is fixed at the second distance in the experimental conditions of Fig.
Fig. 16 is a view for explaining the primary coil portion in the first section cut by the D1-D1 line and the primary coil portion in the second section cut by the D2-D2 line in the transmission pad of Fig. 5 .
FIG. 17 is a view for explaining the arrangement structure of the coils in the second section of the transmission pad of FIG. 16; FIG.
18 is a view for explaining another embodiment of the arrangement structure of the coils in the second cross section of the transmission pad of Fig.
19 is a view for explaining another embodiment of the arrangement structure of the coils in the second section of the transmission pad of Fig.
20 is an exemplary view for explaining a lead wire structure for a primary coil of a transmission pad which can be employed in this embodiment.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all changes, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms 'first, second, A, B', etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term " and / or " includes any combination of a plurality of related listed items or any of a plurality of related listed items.

One end and the other end of the electronic component or element represent two terminals, which may also be referred to as a first terminal and a second terminal, respectively.

When an element is referred to as being "connected" or "connected" to another element, it should be understood that other elements may be present in the middle, or may be directly connected to the other element something to do. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms related to 'comprising', 'having', and the like are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, in the present specification, when subscripts of certain characters have different subscripts, other subscripts of subscripts can be displayed with the same size as subscripts for convenience of display.

Unless otherwise defined herein, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted to be consistent with the contextual meanings of the related art and are not to be construed as ideal or overly formal meanings unless explicitly defined herein.

Some terms used in this specification are defined as follows.

An Electric Vehicle (EV) may refer to an automobile as defined in 49 CFR Code 523.3. The electric vehicle is freely available on the highway and can be driven by electricity supplied from an in-vehicle energy storage device such as a rechargeable battery from a power source outside the vehicle. The power source may include a residential or public electrical service or a generator utilizing vehicle-mounted fuel, and the like.

An electric vehicle EV can be referred to as an electric car, an electric automobile, an electric road vehicle (ERV), a plug-in vehicle (PV), a plug-in vehicle (xEV) XEV is a plug-in all-electric vehicle or battery electric vehicle, a plug-in electric vehicle (PEV), a hybrid electric vehicle (HEV), a hybrid plug-in electric vehicle (HPEV) hybrid electric vehicle, and the like.

A Plug-in Electric Vehicle (PEV) can be referred to as an electric vehicle that is connected to a power grid and recharges a quantity-loaded primary battery.

A plug-in vehicle (PV) may be referred to herein as a rechargeable vehicle through a wireless charging scheme without the use of physical plugs and sockets from electric vehicle supply equipment (EVSE).

Heavy duty vehicles (H.D. Vehicles) may refer to any vehicle with four or more wheels as defined in 49 CFR 523.6 or CFR 37.3 (bus).

A light duty plug-in electric vehicle is a light duty plug-in electric vehicle that can be recharged for use on public streets, roads and highways, or three or four wheels that get propelled by an electric motor powered by another energy device It can refer to a vehicle having an engine. Lightweight plug-in electric vehicles may be specified to have a total weight less than 4.545 kg.

A wireless power charging system (WCS) may refer to a system for controlling between GA and VA, including wireless power transmission, alignment and communication.

Wireless power transfer (WPT) can refer to the transfer of electrical power through contactless means to an electric vehicle in an AC power supply network, such as a utility or a grid.

Utility provides electrical energy and is a set of systems that typically include a Customer Information System (CIS), an Advanced Metering Infrastructure (AMI), and a Rates and Revenue system. Lt; / RTI > The utility allows the plug-in electric vehicle to use energy through price tags or discrete events. The utility can also provide information on tariff rates, intervals for measured power consumption, and verification of electric vehicle programs for plug-in electric vehicles.

Smart charging can be described as a system in which EVSE and / or plug-in electric vehicles communicate vehicle charge rates or discharge rates with the power grid to optimize the grid capacity or time of use ratio.

Automatic charging can be defined as the inductive charging operation of the vehicle in a proper position relative to the primary charger assembly capable of transmitting power. Automatic charging can be performed after obtaining the required authentication and authorization.

Interoperability can refer to a state in which the components of the system relative to each other can operate together to perform the desired operation of the overall system. Information interoperability can refer to the ability of two or more networks, systems, devices, applications or components to share and easily use information securely and effectively, with little or no inconvenience to the user .

An inductive charging system may refer to a system in which two parts transfer energy electronically in a forward direction from an electricity supply network to an electric vehicle via a loosely coupled transformer. In this embodiment, the induction charging system may correspond to the electric vehicle charging system.

An inductive coupler may refer to a transformer that is formed of a GA coil and an VA coil and that transfers power through electrical isolation.

Inductive coupling can refer to magnetic coupling between two coils. The two coils can refer to a ground assembly coil and a vehicle assembly coil.

A ground assembly (GA) may refer to an assembly disposed on the ground or infrastructure side, including a GA coil and other suitable components. Other suitable components may include at least one component for controlling the impedance and resonant frequency, ferrite and electromagnetic shielding material for enhancing the magnetic path. For example, the GA may include the power / frequency converter required to function as a power source for the wireless charging system, the GA controller, and the wiring from the grid and the wiring between each unit and the filtering circuits, the housing, and the like.

A vehicle assembly (VA) may refer to an assembly disposed in a vehicle, including a VA coil and other suitable components. Other suitable components may include at least one component for controlling the impedance and resonant frequency, ferrite and electromagnetic shielding material for enhancing the magnetic path. For example, the VA may include wiring between each unit and filtering circuits, housing, etc., as well as the wiring of the VA controller and the vehicle battery, as well as the rectifier / power converter required to function as a vehicle component of the wireless charging system .

The aforementioned GA may be referred to as a primary device (PD), a primary device, and the like, and VA may be referred to as a secondary device (SD), a secondary device, and so on.

The primary device may be a device that provides contactless coupling to the secondary device, that is, a device external to the electric vehicle. The primary device may be referred to as a primary device. When the electric vehicle receives power, the primary device can operate as a power source for transmitting power. The primary device may include a housing and all covers.

The secondary device may be an electric vehicle mounting device that provides contactless engagement with the primary device. The secondary device may be referred to as a secondary side device. When the electric vehicle receives electric power, the secondary device can transfer the electric power from the primary device to the electric car. The secondary device may include a housing and all covers.

The ground assembly controller (GA controller) may be part of a GA that adjusts the output power level for the GA coil based on information from the vehicle.

The vehicle assembly controller (VA controller) may be part of a VA that monitors specific vehicle parameters during charging and initiates communication with the GA to control the output power level.

The GA controller described above may be referred to as a primary device communication controller (PDCC), and the VA controller may be referred to as an electric vehicle communication controller (VA controller).

The magnetic gap is the distance between the highest plane of the upper portion of the litz wire or the upper portion of the magnetic material of the GA coil and the lowest plane of the magnetic material of the VA coil, Vertical distance can be referred to.

Ambient temperature can refer to the ground level temperature measured in the atmosphere of the target subsystem that is not directly exposed to sunlight.

Vehicle ground clearance can refer to the vertical distance between the road or road pavement and the bottom of the vehicle floor pan.

Vehicle magnetic ground clearance can refer to the vertical distance between the bottom floor of the Litz wire or the insulating material of the VA coil mounted on the vehicle and the pavement.

Vehicle Assembly (VA) The Vehicle Assembly Coil Surface Distance can refer to the vertical distance between the plane bottom of the Litz wire or the magnetic material of the VA coil and the lowest outer surface of the VA coil. Such a distance may include additional items wrapped in a protective cover and coil wrapper.

The aforementioned VA coil may be referred to as a secondary coil, a vehicle coil, a receiver coil, etc. Similarly, a ground assembly coil (GA coil) may be referred to as a primary coil A primary coil, a transmit coil, or the like.

The exposed conductive component may refer to a conductive part of an electrical device (e.g., an electric vehicle) that can be contacted by a person and does not normally conduct electricity but can conduct electricity in the event of a failure.

Hazardous live components can refer to live components that can give a hazardous electric shock under certain conditions.

A live component may refer to any conductor or conductive component that is electrically activated in a basic use.

Direct contact can refer to human contact as an organism.

Indirect contact may refer to the contact of an exposed, electrically-conductive, or electrically-active active ingredient with a failure of insulation.

Alignment may refer to a procedure for locating the relative position of the secondary device with respect to the primary device and / or a procedure for locating the relative position of the primary device with respect to the secondary device for a defined efficient power transfer. Alignment herein may refer to, but is not limited to, alignment of a wireless power transmission system.

Pairing may refer to a procedure in which a vehicle (electric vehicle) is associated with a single dedicated ground assembly (primary device) arranged to transmit power. Pairing herein may include a procedure for associating a charge spot or a specific ground assembly with a vehicle assembly controller. Correlation / Association may involve establishing a relationship between two peer communication entities.

Command and control communication may refer to communication between an electric vehicle and an electric vehicle, which exchanges information necessary to initiate, control, and terminate the wireless power transfer process.

High level communication can handle all information that exceeds the information in command and control communication. The data link of the high level communication can use PLC (Power line communication), but is not limited thereto.

Low power excitation may refer to activating an electric vehicle to sense a primary device to perform precise positioning and pairing, but is not so limited, and vice versa.

An SSID (service set identifier) is a unique identifier consisting of 32-characters attached to a header of a packet transmitted on a wireless LAN. The SSID identifies the basic service set (BSS) that the wireless device attempts to connect to. SSID basically distinguishes several wireless LANs from each other. Therefore, all APs and all terminal / station devices that want to use a particular wireless LAN can use the same SSID. Devices that do not use a unique SSID are not able to join the BSS. Because the SSID is shown as plain text, it may not provide any security features to the network.

Extended service set identifier (ESSID) is the name of the network to which you want to connect. It is similar to SSID but can be a more extended concept.

A basic service set identifier (BSSID) is usually used to distinguish a specific basic service set (BSS) by 48 bits. In the case of an infrastructure BSS network, the BSSID may be medium access control (MAC) of the AP equipment. For an independent BSS or ad hoc network, the BSSID can be generated with any value.

The charging station may include at least one ground assembly and at least one ground assembly controller for managing the at least one ground assembly. The ground assembly may include at least one wireless communication device. The charging station may refer to a place having at least one ground assembly installed in a home, office, public place, road, parking lot, and the like.

In the present embodiment, the light load operation or the light load operation is performed by, for example, charging the high voltage battery to a charging voltage lower than a predetermined rated voltage for charging the battery in the latter half of the high voltage battery connected to the VA in the WPT system Operation. In addition, the light load operation may include a case where the high-voltage battery of the electric vehicle is charged at a relatively low voltage at a low speed using a low-speed charger such as a household charger.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a conceptual diagram for the x / y axis defined in SAE J2954, which can be employed in this embodiment.

As shown in FIG. 1, in the wireless power transmission system of an electric vehicle, a right hand coordinate system can be used to define the structure and position of the transmission pad and the reception pad.

In the right-handed coordinate system, the front direction or the back-and-forth direction of the vehicle is defined as the x-axis, the driver side for the left hand side vehicle or the left and right sides of the vehicle as the y- , The magnetic center of the ground assembly (GA) coil can be defined as x = 0 and y = 0, and the ground surface as z = 0.

2 is a configuration diagram of a transmission pad according to a SAE J2954 standard according to a comparative example.

As shown in the cross-sectional view (A) and the plan view (b) of FIG. 2, the transmission pad is composed of a GA coil, a ferrite, an aluminum plate, and a housing covering them. The B-B cross-sectional structure is substantially the same as the cross-sectional structure shown in the A-A cross-sectional view except that the length in the x-direction of the central space of the GA coil is 240 mm.

The GA coil has a rectangular structure, and four corners of the rectangular structure have a shape bent to a predetermined radius. The coil width of the GA coil is substantially the same in the x-direction and the y-direction. That is, the coil width is 70 mm in the x-direction or y-direction. In this comparative example, the GA coil is illustrated in the form of a winding wound 22 times in a rectangular shape.

The thickness of the ferrite is 6 mm, and the thickness of the aluminum plate is 2 mm. The external thickness of the transmission pad is 60 mm, and the vertical height from the ground to the top of the GA coil is 53 mm (see SAE J2954). This vertical height may correspond to a vertical height from the bottom of the housing to the top of the ferrite in the case of other structures.

3 is a block diagram of a receiving pad according to a SAE J2954 standard according to a comparative example.

As shown in plan view (a), central section (b) and partial enlargement (c) of the central cross-sectional view of FIG. 3, the receiving pad is comprised of VA aluminum, VA ferrite, vehicle assembly (VA) coil and insulating VA housing .

The VA coil has a square structure, and four corners of the square structure have a shape bent to a predetermined radius. The maximum thickness of the VA coil is 7.0 mm, and the coil width is the same in the x-direction and the y-direction. The coil width is 36 mm in the x- and y-directions, respectively. In this comparative example, the GA coil is illustrated in the form of a wound wire wound sixteen times in a rectangular shape.

The thickness of the VA ferrite is 6 mm. The VA ferrite may have a central protruding U-shaped structure inserted into the center space of the VA coil.

The insulating AV housing is placed between the VA ferrite and the VA aluminum, surrounding the VA coil and covering the VA ferrite. The VA aluminum is disposed in contact with the aluminum underbody plate.

The size of the receiving pad is 250 mm x 250 mm, and the thickness of the receiving pad is 20 mm except for the aluminum underbody plate.

The dimensions and spacing of the transmission pad and the reception pad in the above-described comparative example are summarized in Table 1 below.

4 is a graph illustrating a coupling performance between the transmitting and receiving pads according to a comparative example.

Referring to FIG. 4, in the wireless power transfer (WPT) of the comparative example, the vertical separation distance between the transmitting and receiving coils included in the Z-classes 1 and 2 (Z1 and Z2) is 50/170 [mm] When the receiving pad is horizontally spaced, the coupling performance between SAE J2954 transceiver pads is shown.

According to the criteria presented in the comparative example, the performance at the vertical spacing distance of 50 mm was evaluated to a maximum of 100 mm and 150 mm when the spacing between the x and y axes was 100 mm and 150 mm, respectively. Were evaluated to the maximum of 75 mm and 100 mm, respectively. At this time, the receiving pad is applied as it is, except that the ferrite shape is changed to the plate type among the receiving pad conditions shown in SAE J2954. The meaning of each axis (x axis, y axis and z axis) is as described in FIG.

Table 2 shows the values of each point for the distribution of the coupling coefficient for each condition.

As shown in the comparative example, the coupling coefficient between the GA / VA coils is 0.222 at the maximum vertical spacing of 50 mm, and the distance between the GA and VA coils tends to decrease with distance from the x-axis.

Also, the coupling coefficient between GA / VA coils was 0.080 at the vertical separation distance of 170 mm, and the coupling coefficient did not change much within the range of x / y axis separation distance of 75 mm / 100 mm.

5 is a plan view of a wireless power transmission pad in accordance with an embodiment of the present invention.

Referring to FIG. 5, a wireless power transmission pad (hereinafter simply referred to as a "transmission pad") 100 according to the present embodiment includes a primary coil 10, a ferrite 20, and a housing. The transmission pad 100 may further include a metallic shield (see 30 in FIG. 6). The housing may be referred to as an insulating member (40), a first insulating material, or a second insulating material as an insulating member.

The primary coil 10 places the transmission pad 100 on a floor parallel to the xy plane defined by the x- and y-directions and defines an X-width (x1) defined in the x-direction and a y- And a Y-width (y1) defined in a rectangular shape. Further, the primary coil 10 may have a central space C1 located inside the rectangular shape.

The X-width (x1) is the width for the first portion of the primary coil (10) overlapping with a straight line extending in the x-direction, and the Y- Lt; RTI ID = 0.0 > 10 < / RTI >

In this embodiment, the X-width (x1) is smaller than the Y-width (y1). The X-width (x1) may be less than about 0.7 times the Y-width (y1). If the thickness of the first portion and the thickness of the second portion are the same in the z-direction orthogonal to the xy plane, the first cross-sectional area of the first portion with X-width (x1) .

In other respects, since there is a section of the winding made up of substantially the same number of coils in the first cross-sectional area and the second cross-sectional area, the area (first area) of the insulating material between the coils of the windings in the first cross- (Second area) of the insulating material between the coils of the windings in the cross sectional area.

The X-width (x1) is greater than 80 mm and smaller than 100 mm in consideration of the error range, and the Y-width (y1) may be larger than 120 mm and smaller than 140 mm in consideration of the error range. Preferably, the X-width (x1) is 90 mm and the Y-width (y1) may be 130 mm. Therefore, the ratio (x1 / y1) of the X-width (x1) and the Y-width (y1) may be larger than 0.5715 (4/7) and smaller than 0.8333 (5/6). Preferably, the ratio (x1 / y1) of the X-width (x1) and the Y-width (y1) may be about 0.6923 (9/13).

Corresponding to the above-described transmission pad, the reception pad can have the structure and dimensions shown in FIG. That is, in the receiving pad of the wireless power transmission system using the transmission pad of this embodiment, the X2-width of the secondary coil defined in the x-direction is greater than 35 mm and smaller than 37 mm, The Y2-width of the coil may be greater than 35 mm and less than 37 mm.

The ferrite 20 is disposed adjacent to the primary coil 10 and is magnetized by the magnetism induced from the primary coil 10 and paired with the ferrite of the receiving pad to realize a high permeability. Since the ferrite 20 is close to the insulator, heat generation is small.

In this embodiment, the ferrite 20 or the ferrite structure can be manufactured in the form of a plate using MnZn ferrite (PL-13). Of course, the ferrite 20 can be manufactured by using ferrites of different series within a range where the initial permeability is high and the saturation magnetic flux density is satisfied. When the flat plate type ferrite 20 is used, there is an advantage that a magnetic flux component leaking into the bar type ferrite is not generated when the bar type ferrite is used, so that the loss can be prevented as compared with the bar type ferrite.

The ferrite 20 has a rectangular shape having a vertical length Xf and a horizontal length Yf in an x-y plane orthogonal to the z-axis. The ferrite 20 may have a size protruding by a predetermined length outside the outline edge of the primary coil 10 when superimposed on the primary coil 10 in the x-y plane.

The ferrite 20 may have a coupling structure 22 for enhancing coupling with the insulating member 40 in a structure in which the ferrite 20 is laminated with the primary coil 10 and the insulating member 40. The coupling structure 22 may include a concave-convex structure disposed at the boundary between the ferrite 20 and the insulating member 40. The concave-convex structure may include a concave portion, a convex portion, or a combination thereof.

In this embodiment, the joining structure 22 may have a shape in which two concave-convex portions cross each other at each bottom portion of the four corners of the ferrite 20 when viewed in the x-y plane. The concave and convex portion may have a cross-sectional structure of a groove, a projection, or a combination thereof. In this case, the laminated structure of the ferrite 20 and the insulating member 40 can be made solid in both the x-, y-, and z-axis directions.

The insulating member 40 is made of a material that supports and electrically insulates the primary coil 10, the ferrite 20, and the metallic shield. The insulating member 40 may include a first insulating member and a second insulating member that are stacked on each other. The insulating member 40 may be formed by molding the epoxy material at least once.

In this embodiment, the ferrite 20 is disposed on the first insulating member, and the second insulating member can be laminated on the ferrite 20. [ A primary coil may be embedded in the second insulating member.

On the other hand, in the above-described embodiment, two X-widths on both sides in the vertical direction (x-direction) of the central space C1 in the rectangular primary coil are equal to each other, Although the two Y-widths of both sides are described as being equal to each other, the present embodiment is not limited to such a configuration, and two X-widths may have different widths, or two Y-widths may have different widths, One of the Y-widths may have the same size as the X-width. Such a modified form is a form in which the coil width structure shown in this embodiment is partially adopted. Although the performance may be slightly lower than that of the optimal embodiment, it is still possible to have a high coupling performance as compared with the conventional technique or the comparative example , And can be included in the scope of the present invention. The structure of such a transmission pad can be predicted from this embodiment, and a detailed description thereof will be omitted.

Figure 6 is a left side view of the transmission pad of Figure 5;

6, the transmission pad 100 according to the present embodiment includes a metallic shield 30 disposed in a first insulation material 42, a ferrite 20 deposited on a first insulation material 42, A second insulating material 44 laminated on the ferrite 20 and a laminated structure of the primary coil 10 accommodated in the second insulating material 44. [

The primary coil 10 may include a first coil layer 11 and a second coil layer 12 stacked on the first coil layer 11. [ When the first coil layer 11 is arranged so as to be in contact with a first plane parallel to the xy plane, the second coil layer 12 contacts the second plane which is parallel to the z- As shown in FIG. In this embodiment, a material of the first insulation member having a thickness of several millimeters may be placed between the first coil layer 11 and the second coil layer 12.

The primary coil 10 may have two X-widths (x1) with respect to the longitudinal length L1 in the x-direction of the transmission pad 100. [ In this embodiment, the lengths of the two X-widths (x1) arranged on both sides of the central space portion of the predetermined length (x2) are the same. Depending on the implementation, the two X-widths may have different lengths, but at least one of the two X-widths must have the coil width x1 suggested herein for improved wireless power transmission performance. The coil width x1 corresponding to the X-width may be greater than 80 mm, less than 100 mm, and preferably 90 mm.

The ferrite 20 may have a size slightly larger than the rectangular primary coil 10. Assuming that the transmission pad 100 is placed on the xy plane and can be viewed through the second insulating member 44, the ferrite 20 is arranged outside the outline of the primary coil 10 in both directions of the x- ) As shown in FIG. The width x3 may be 30 mm, but is not limited thereto.

The metallic shield 40 can be made of aluminum. In this embodiment, the aluminum structure for the metallic shield 40 may be pure aluminum having a purity of 99% or more. However, the present invention is not limited thereto, and aluminum having other compositions can be applied as long as there is little difference in electrical characteristics.

The metallic shield 40 or its corresponding aluminum may have a size slightly larger than the rectangular ferrite 20. [ Assuming that the transmission pad 100 is placed on the xy plane and can be seen through the first insulating member 42, the metallic shield 40 is formed on the outside of the outline of the ferrite 20 in both directions of the x- ) As shown in FIG. The width x4 may be 20 mm, but is not limited thereto.

The first insulating member 42 may have a size slightly larger than that of the second insulating member 42 having a rectangular shape. When the transmission pad 100 is placed on the xy plane, the first insulation member 42 may have a portion exposed by a predetermined width x4 outside the outline of the second insulation member 44 in both the x-axis direction . According to this structure, in the laminated structure of the first insulating member 42 and the second insulating member 44, the vertical length of the rectangular insulating member may have a stepped portion which is different in the z-axis direction.

Figure 7 is a front view of the transmission pad of Figure 5; 8 is an enlarged front view of part A of the transmitting pad of Fig.

Referring to FIG. 7, in the transmission pad 100 according to the present embodiment, the primary coil 10 has two Y-widths (hereinafter referred to as " Y-widths & y1. In this embodiment, the lengths of the two Y-widths y1 arranged on both sides of the central space of the specific transverse length y2 are the same. Depending on the implementation, the two Y-widths may have different lengths, but at least one of the two Y-widths must have the coil width y1 suggested herein for improved wireless power transmission performance. The coil width y1 corresponding to the Y-width may be greater than 120 mm, less than 140 mm, and preferably 130 mm.

The ferrite 20 may have a size slightly larger than the rectangular primary coil 10. The ferrite 20 is formed on the outer side of the outline of the primary coil 10 in both the y-axis directions with a predetermined width y3 (see FIG. 5), assuming that the transmission pad 100 is placed on the xy plane and viewed through the second insulating member 44. [ ) As shown in FIG. The width y3 may be 30 mm, but is not limited thereto.

The metallic shield 40 may be formed of aluminum and may have a size slightly larger than that of the rectangular ferrite 20. The metallic shield 40 is exposed to the outside of the outline of the ferrite 20 by a predetermined width x4 in both directions of the y axis when the transmission pad 100 is placed on the xy plane and viewed through the first insulating member 42. [ . ≪ / RTI > The width x4 may be 20 mm, but is not limited thereto.

The first insulating member 42 may have a size slightly larger than that of the second insulating member 42 having a rectangular shape. When the transmission pad 100 is placed on the xy plane, the first insulation member 42 may have a portion exposed by a predetermined width x4 outside the outline of the second insulation member 44 in both directions on the y axis. According to this structure, in the laminated structure of the first insulating member 42 and the second insulating member 44, the transverse length of the rectangular insulating member may have a stepped portion which is different in the z-axis direction.

7, the specific dimensions of the transmission pad according to the present embodiment can be exemplified as shown in Fig.

That is, the thickness of the metallic shield 30 disposed in the first insulating member may be 2 mm, and the thickness between the upper portion and the lower portion of the first insulating member 42 including the metallic shield 30 may be 17 mm , Where the thickness between the top of the metallic shield 30 and the bottom of the ferrite 20 may be 10 mm.

The thickness of the ferrite 20 may be 6 mm and the thickness of the first insulating member 42 may be 15 mm and the thickness of each of the first coil layer 11 and the second coil layer 12 may be, And the thickness of the interlayer material of the second insulating member 44 disposed between the first coil layer 11 and the second coil layer 12 may be 2 mm. The second coil layer 12 may be exposed on the upper portion of the second insulating member 44.

The dimensions and spacing of the transmission pad 100 of the present embodiment are summarized as follows.

The outer thickness of the laminated structure including the primary coil 10, the second insulating member 44, the ferrite 20, the first insulating member 42, and the metallic shield 30 is about 38 mm . The vertical distance from the lower portion of the first insulating member 42 to the upper portion of the primary coil 10 or the upper portion of the second insulating member 42 is smaller than 40 mm . This indicates that it is possible to provide a transmission pad which is considerably thinner than the vertical distance 53 mm or 60 mm of the comparative example.

In addition, the transmission pad 100 according to the present embodiment has a new structure in the relationship of the X-width (x1) and the Y-width (y1).

That is, in the transmission pad 100 of the present embodiment, the first value A obtained by adding the X-width of the primary coil and the vertical length in the x-direction of the center space, the Y- (B / A) with respect to the second value B obtained by adding the horizontal length in the - direction to the first value A and the second value B, (A / (BA)) with respect to the value BA obtained by subtracting the first ratio [A / (BA)] from the first ratio [A / (BA)] is about 1.414 and about 2.417. This indicates that the structure of the transmission pad of the present embodiment is different from that of the conventional transmission pad in that the ratio A: (B-A) is designed with a golden ratio of [1: 1.618].

In addition, the transmission pad 100 according to the present embodiment has a structure different from that of the comparative example in the relationship between the coil width and the ferrite length in addition to the condition of the coil width itself.

That is, when the coil width and the ferrite length in the x-direction and the y-direction in the transmission pad 100 according to the present embodiment are respectively expressed as a ratio, the first ratio in the x-direction is 0.204 (90 mm / 440 Mm) and the second ratio in the y-direction is equal to 0.216 (130 mm / 600 mm). This ratio can be equally applied when the external size of the transmission pad and the ferrite length are to be increased or decreased. As described above, the transmission pad 100 according to the present embodiment can obtain excellent coupling performance in a similar manner by changing the coil width of the primary coil according to the length of the transmission pad or ferrite.

For example, in the transmission pad 100 of the present embodiment, the X-length Xf indicating the length (vertical length) of the ferrite 20 in the x-direction and the corresponding coil width in the x- The first ratio x1 / Xf of the X-width x1 is greater than 0.2 and the Y-length Yf indicating the length (width) in the y-direction of the ferrite 20 and the corresponding y- The second ratio y1 / Yf of the Y-width y1 representing the coil width in the first region is greater than 0.2, and the first ratio and the second ratio may have a difference of less than 0.02 in the range of 0.21 + 0.07.

As described above, according to the present embodiment, it is possible to provide a transmission pad in which coupling performance is maximized under a coil width condition different from that of the comparative example.

FIG. 9 is an exemplary view of experimental conditions for obtaining the coil width condition of the transmission pad of FIG. 5; FIG.

9, the X-width (x1) of the primary coil, that is, the X-axis width and the X-axis width of the primary coil, which can maximize the coupling performance for wireless power transmission to the transmission pad having the rectangular- , And the Y-width (y1), that is, the Y-axis width. For this purpose, in the present embodiment, evaluation of the coupling coefficient according to the x-axis (corresponding to the x-direction) or the y-axis (corresponding to the y-direction)

Adjustable coil configuration parameters include coil, ferrite, and aluminum to maximize coupling performance between the transmit and receive coils, ie, the primary and secondary coils. In order to minimize the loss of these components, aluminum has a dimension (2 mm) corresponding to the standard, and the maximum thickness (6 mm) of the ferrite is adopted in consideration of the maximum coupling factor.

The number of turns of the coils, the diameter of the coils, and the spacing between the coils are considered in the system design, such as magnetic resonance and frequency control, but they have no substantial effect on the coupling performance between the transmitting and receiving coils. Evaluation was carried out. In the present embodiment, the coupling performance according to the coil width was compared and evaluated for each of the five conditions (50/70/90/110/130 mm) for the X-width and the Y-width.

10 is a graph showing the coupling coefficient according to the x-axis separation distance in the experimental conditions of FIG.

10, when the receiving coil, i.e., the secondary coil, is spaced apart from the x-axis, the coupling coefficient performance increases as the y-axis coil width increases when the transmitting coil, that is, the x- And showed excellent performance.

This is because as the y-axis width of the primary coil increases, the y-direction inner diameter of the primary coil and the y-direction inner diameter of the secondary coil are positioned substantially perpendicular to each other, which is advantageous for magnetic flux linkage. It was observed that this coupling coefficient aspect / tendency changes substantially the same with the variation of the y-axis coil width regardless of the x-axis coil width of the primary coil.

As described above, in the present embodiment, when the y-axis width of the primary coil is varied from 50 mm to 20 mm to 130 mm, as the y-axis coil width increases, the coupling coefficient due to the spacing fluctuates from a relatively large value .

11 is a graph showing the coupling coefficient according to the y-axis separation distance in the experimental conditions of FIG.

11, when the y-axis coil width (for example, 90 mm) of the primary coil is the same as that of the primary coil when the secondary coil is separated from the y-axis, the coupling coefficient performance increases as the x- Respectively.

This is because, as the x-axis width of the primary coil increases, the x-direction inner diameter of the primary coil and the x-direction inner diameter of the secondary coil are positioned substantially perpendicular to each other, which is advantageous for flux linkage. It was observed that this coupling coefficient aspect / tendency changes substantially the same with the variation of the x-axis coil width regardless of the y-axis coil width of the primary coil.

As described above, in the present embodiment, when the x-axis width of the primary coil is varied from 50 mm to 20 mm to 130 mm, as the x-axis coil width increases, the coupling coefficient due to the generation of the spacing varies from a relatively large value .

In the above-described embodiment, when the coil width is 30 mm, the space for winding the coil is too small to ensure the inductance. When the coil width is 150 mm, the performance against the horizontal spacing is relatively too low .

In addition to the examples described above, the x-axis coil width may be fixed to 50 mm, 70 mm, 110 mm, or 130 mm to change the y-axis coil width, or the y-axis coil width to be 50 mm, 70 mm, Or 130 mm, and the x-axis coil width was changed. As a result, it was observed that the bonding performance was the best when the x-axis coil width was 90 mm and the y-axis coil width was 130 mm.

12 is a graph of the x-axis spacing coupling coefficient in a state where the z-axis spacing distance is fixed at the first distance in the experimental conditions of Fig. 13 is a graph of the y-axis separation coupling coefficient in a state where the z-axis separation distance is fixed at the first distance in the experimental conditions of Fig. FIG. 14 is a graph of the x-axis spacing coupling coefficient in a state where the z-axis spacing distance is fixed at the second distance in the experimental conditions of FIG. And FIG. 15 is a graph of the y-axis separation coupling coefficient in a state where the z-axis separation distance is fixed at the second distance in the experimental conditions of FIG.

12 to 15, when the coil width ratio of the x-axis and the y-axis is 0.204 / 0.217 in this embodiment, the coupling performance is the most excellent in almost all cases. In the case of the vertical separation distance of 50 mm, (See Fig. 13), the coupling coefficient was about 94% at the maximum separation distance (150 mm).

According to the present embodiment, the coil width (Y-width) y1 of the primary coil corresponding to the longitudinal direction (y-direction) of the rectangular transmission pad is divided into the first It is possible to provide a structure (transmission pad structure) capable of maximizing the coupling performance with the secondary coil in the rectangular primary coil in the rectangular transmission pad by designing it to be wider than the coil width (X-width) have.

According to the above-described embodiments, the present invention has the following advantages over the conventional transmission pad.

First, in an electric vehicle wireless power transmission system, high efficiency charging can be performed when an initial coupling coefficient is large and no separation occurs during parking of an electric vehicle. Even when a separation occurs, high efficiency can be achieved compared with the existing structure.

Also, the variation of the coupling coefficient is not large even when the parking is separated, which is easy in terms of the application of the control technique.

Further, when the vertical separation distance between the transmitting and receiving coils is 50 mm and the distance between the center axes of the transmitting coil and the receiving coil is not equal to about 43 (m / s) %, And the coupling performance can be maintained at 94% at the maximum separation distance condition (y-axis separation distance of 150 mm).

In addition, the vertical separation distance between the transmitting and receiving coils is 170 mm and the coupling performance is excellent by about 17% compared to the conventional transmitting pad condition under the condition that there is no separation between the central axes of the transmitting coil and the receiving coil. (y-axis separation distance of 100 mm), it is possible to provide a transmission pad having excellent coupling performance by about 8%.

The second portion of the primary coil having the Y-width in the above-described technical configuration may have various structures or shapes. The arrangement of the coils of the second in-section winding has an advantage that it can improve the degree of freedom of design while providing excellent coupling performance depending on the shape of the transmission pad. In addition, the arrangement of the coils of the second inner coil can be designed differently so that the shape of the magnetic field can be changed while keeping the coupling performance substantially the same in the magnetic coupling between the transmitting and receiving coils for wireless power transmission.

Fig. 16 is a diagram for explaining the primary coil portion in the first section cut by the D1-D1 line and the primary coil portion in the second section cut by the D2-D2 line in the transmission pad of Fig. 5 . In FIG. 16, cross-sections perpendicular to each other are shown on the same plane together with a cross-sectional placement direction indication.

16A and 16B, the first cross-sectional area 10A for the first portion of the primary coil 10 on the first section in the transmission pad according to the present embodiment is smaller than the first cross- Sectional area 10B for the second portion of the coil. Here, the area of the coils of the windings in the first cross-sectional area 10A and the area of the coils of the windings in the second cross-sectional area 10B are substantially equal to each other. That is, the first cross-sectional area 10A includes circular cross-sectional areas for 50 coils, and the second cross-sectional area 10B may also include circular cross-sectional areas for 50 coils. The number of coils of the winding can be changed in consideration of the inductance of the wireless power transmission system.

Regarding the structure of this embodiment, in the case of the primary coil structure of a general transmission pad, assuming that there is a margin in the thickness or the vertical length in the z-direction, from the form in which the windings of the primary coil are arranged substantially parallel to the xy plane, And may have the form of stacking or extending in different layers. However, even in this general primary coil structure, the cross-sectional area for the first part of the primary coil in the x-direction and the cross-sectional area for the second part of the primary coil in the y-direction are usually substantially equal to each other. Here, the cross-sectional area can define a single block connecting the outlines of adjacent coils in the first part or the second part to the cross-sectional area.

As described above, in this embodiment, in the rectangular transmission pad having the longitudinal direction in the y-direction, the coil width (Y-width) in the y-direction of the primary coil having the rectangular shape is defined as the coil width -Width) to form a winding block of a first part having a Y-width and a winding block of a second part having an X-width, Performance can be maximized.

FIG. 17 is a view for explaining the arrangement structure of the coils in the second section of the transmission pad of FIG. 16; FIG.

Referring to Fig. 17, the second portion of the primary coil 10 of the transmission pad according to the present embodiment has a winding block of a second cross-sectional area 10B. The area of the coils 101 in the second cross-sectional area 10B of this winding block is equal to the area of the coils in the winding block of the first cross-sectional area described above. However, the coils 101 of the second part according to the present embodiment may be arranged at a constant interval d1 in the y-direction to maintain the Y-width y1.

In addition, the insulating material 102 is filled between the coils 101 in the second cross-sectional area 10B. In this embodiment, the area of the insulating material 102 in the second cross-sectional area 10B is larger than the area of the insulating material in the first cross-sectional area (see 10A in Fig. 16). This is intended to increase the coil width in the second portion by a certain percentage greater than the coil width in the first portion in order to maximize the coil coupling performance for wireless power transmission.

On the other hand, in the present embodiment, the coils of the windings in the second cross sectional area are arranged at regular intervals in the y-direction. However, the present invention is not limited to such a configuration, and the spacing between adjacent coils in the y- Or < / RTI > In this case, it is possible to concentrate the magnetic field toward the center space side of the primary coil or concentrate the magnetic field toward the outline side of the primary coil.

18 is a view for explaining another embodiment of the arrangement structure of the coils in the second cross section of the transmission pad of Fig.

Referring to FIG. 18, the primary coil of the transmission pad according to the present embodiment may have a multi-layered winding form of the coils of the first layer and the coils of the second layer in the second portion. The first layer and the second layer may be laminated in the z-direction.

The distance d2 between the adjacent two coils of the first layer may be smaller than the distance d1 between the adjacent two coils of the second portion inner winding described above with reference to Fig. If the distance between the adjacent coils is small, the intensity of the magnetic field can be increased as the gap is small.

In addition, the distance d3 between the two adjacent coils of the second layer may be larger than the distance d1 between the adjacent two coils of the second in-portion coil described above with reference to Fig. Here, the interval may be an average interval. If the distance between the adjacent coils is large, the intensity of the magnetic field can be made small as the gap is large.

According to the present embodiment, the primary coils can include coils of the first layer and the coils of the second layer, which are arranged in different numbers in the second portion, A transmission pad having a high degree of freedom can be provided.

19 is a view for explaining another embodiment of the arrangement structure of the coils in the second section of the transmission pad of Fig.

Referring to FIG. 19, the primary coil of the transmission pad according to the present embodiment may have a multi-layer structure in the second portion. In that case, the coils of the first layer and the second layer of the multi-layer structure may be arranged differently in the number or spacing.

However, even when the coils are arranged at different lengths (y0, y1), numbers, or intervals for each layer in a plurality of layers, the coils arranged in at least one layer must have the Y-width y1 described above.

In this embodiment, the second cross-sectional area 10B1 may be substantially reduced compared to the second cross-sectional area 10B described above, but if the Y-width y1 is maintained, high bonding performance can be substantially maintained. As described above, in the present embodiment, various coil arrangement structures can be adopted while having high coupling performance within a limited outer thickness or vertical length of the transmission pad.

20 is an exemplary view for explaining a lead wire structure for a primary coil of a transmission pad which can be employed in this embodiment.

Referring to FIG. 20, the transmission pad 100 according to the present embodiment may include a pair of lead lines 101 and 102. The lead wires 101 and 102 may be combined with separate terminals or connectors 103 and 104. [ Of course, depending on the implementation, the connectors 103 and 104 may have a structure 105 that is disposed integrally within a single housing.

The transmission pad 100 having the lead lines 101 and 102 described above can be connected to the power conversion circuit of the direct power conversion unit. Also, depending on the implementation, the transmission pad 100 may be coupled to a separate terminal block or connector unit, and may be electrically connected to a power conversion circuit coupled to the terminal block or connector unit.

On the other hand, in a wireless power transmission system, a compensation capacitor is used in a resonance network for magnetic coupling between a primary coil and a secondary coil. In the transmission pad of the present embodiment, the above-described compensation capacitor can be arranged in the same space as the transmission pad or can be configured using a separate board. Here, the layout for a space such as a transmission pad may include a layout structure in which a compensation capacitor is incorporated inside the housing of the transmission pad or a compensation capacitor is connected to the outside of the housing.

The transmission pad described above may be included in a ground assembly of a wireless power transmission system.

That is, the ground assembly according to the present embodiment may include a power conversion unit for converting power from a grid or a power source, and a wireless power transmission pad for coupling to the power conversion unit.

The wireless power transmission pad includes a rectangular primary coil having a central space with a defined Y-width in the x-direction and a Y-width defined in the y-axis direction and ferrite coupling to the primary coil .

Here, the first cross-sectional area for the first portion of the primary coil having the X-width is smaller than the second cross-sectional area for the second portion of the primary coil having the Y-width. Further, the first area of the insulating material within the first cross-sectional area may be smaller than the second area of the insulating material within the second cross-sectional area.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (20)

A wireless power transmission pad that is prepared to transmit wireless power to a receiving pad comprising a secondary coil,
a rectangular-shaped primary coil having an X-width defined in the x-direction and a Y-width defined in the y-direction and having a central space;
Ferrite bonding with the primary coil; And
And a housing for supporting the primary coil and the ferrite,
Wherein the first cross-sectional area for the first portion of the primary coil having the X-width is less than the second cross-sectional area for the second portion of the primary coil having the Y-width. The method according to claim 1,
Wherein the ratio of the first cross-sectional area to the second cross-sectional area is 9/13. The method according to claim 1,
The X-width is greater than 80 mm and less than 100 mm, and the Y-width is greater than 120 mm and less than 140 mm. The method of claim 3,
The X-width is 90 mm, and the Y-width is 130 mm. The method of claim 3,
The second ratio of the Y-width to the Y-length of the ferrite defined in the y-direction and the first ratio of the X-width to the X-length of the ferrite defined in the x- 0.0 > 0.02. ≪ / RTI > The method of claim 3,
The X2-width of the secondary coil defined in the x-direction is greater than 35 mm and less than 37 mm, and the Y2-width of the secondary coil defined in the y-direction is greater than 35 mm and less than 37 mm. Power transmission pad. The method according to claim 1,
The Y-width in the rectangular primary coil includes a first Y-width and a second Y-width disposed in the y-direction with the central space of the primary coil interposed therebetween, and the size of the first Y- And the second Y-width is different in size. The method of claim 7,
The size of either the first Y-width and the second Y-width is equal to the X-width. A wireless power transmission pad that is prepared to transmit wireless power to a receiving pad comprising a secondary coil,
a rectangular-shaped primary coil having an X-width defined in the x-direction and a Y-width defined in the y-direction and having a central space;
Ferrite bonding with the primary coil; And
And a housing for supporting the primary coil and the ferrite,
The first area of the insulating material in the first cross-sectional area for the first portion of the primary coil having the X-width is greater than the first area of the insulating material in the second cross-sectional area for the second portion of the primary coil having the Y- Is smaller than the second area of the second power supply pad. The method of claim 9,
Wherein an average spacing between two adjacent coils arranged in the x-direction in the cross-section of the first portion is smaller than an average spacing between two adjacent coils arranged in the y-direction in the cross-section of the second portion, Wireless power transmission pad. The method of claim 9,
Wherein the ratio of the first cross-sectional area to the second cross-sectional area is 9/13. The method of claim 9,
Wherein the ferrite surrounds the primary coil and protrudes into a central space of the primary coil. The method of claim 9,
Further comprising a metallic shield, wherein a laminated structure of a first insulating material, the ferrite, a second insulating material, and the primary coil is disposed on top of the metallic shield. 14. The method of claim 13,
Wherein the outer thickness or vertical distance from a lower portion of the first insulating member located below the metallic shield to an upper portion of the primary coil in the laminated structure is less than 40 mm. The method of claim 9,
Wherein the windings of the second portion comprise a multi-layer structure. 16. The method of claim 15,
Wherein the coils in the windings of the multi-layer structure are arranged at regular intervals in the y-direction. 16. The method of claim 15,
Wherein adjacent coils of the first layer in the winding of the multi-layer structure and adjacent coils of the second layer are arranged at different average intervals. 16. The method of claim 15,
Wherein the coils in the windings of the multi-layer structure are arranged such that the spacing between the two coils adjacent in the y-direction sequentially decreases or increases. A ground assembly for a wireless power transmission system,
A power conversion unit for converting power from a grid or a power source; And
And a wireless power transmission pad coupled to the power conversion unit,
The wireless power transmission pad includes a rectangular primary coil having a central space and an X-width defined in the x-axis direction and a Y-width defined in the y-axis direction, and ferrite coupled to the primary coil and,
Wherein the first cross-sectional area for the first portion of the primary coil having the X-width is less than the second cross-sectional area for the second portion of the primary coil having the Y-width. The method of claim 19,
Wherein a first area of the insulating material within the first cross sectional area is smaller than a second area of the insulating material within the second cross sectional area.

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