KR20150142905A

KR20150142905A - Wireless power transmission system using Shaped Magnetic Field in Resonance

Info

Publication number: KR20150142905A
Application number: KR1020140071499A
Authority: KR
Inventors: 심형욱; 김종우; 조동호
Original assignee: 한국과학기술원
Priority date: 2014-06-12
Filing date: 2014-06-12
Publication date: 2015-12-23

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission system using a self resonance shaping technique, and more particularly, to a wireless power transmission system using a self-resonant shaping technique among wireless power transmission techniques, To a wireless power transmission system usable for a monorail for commercialization of an electric vehicle.
According to the present invention, it is possible to provide a monorail that reduces power loss due to power supply cabling during wireless power transmission.

Description

Technical Field [0001] The present invention relates to a wireless power transmission system using a self-resonant shaping technique,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission system using a self resonance shaping technique, and more particularly, to a wireless power transmission system using a self resonance shaping technique among wireless power transmission techniques, To a wireless power transmission system usable for a monorail for commercialization of an electric vehicle.

Compared with the technology used for general wireless power transfer (WPT), the magnetic resonance method has been improved and improved in terms of transmission distance and transmission efficiency. However, there are still many difficulties in commercialization or commercialization of the electronic devices and transport machines because they are insufficient in the synchronous efficient parts.

In order to solve these problems, a self-resonant shaping technique (SMFIR, Shaped Magnetic Field in Resonance for monorail) has been developed, and electric power having a high-performance power transmission efficiency which can be used by transmitting more than 85% Commercialization of automobiles has been made. Therefore, it has been proved to be highly technically perfected and operated in various places such as Seoul National University Park, KAIST shuttle bus, and Gumi city, and it is expected to be used in more areas and fields.

Despite the many advantages of wireless power transmission, however, the technical improvement of the power supply system and the introduction of new technologies are insufficient and the use and introduction in the monorail and railway fields are insufficient. Particularly in the monorail and railroad sectors, there is a problem that the power loss due to the power supply line is still large among power losses that may occur in the wireless power transmission.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a monorail that reduces power loss due to a power supply line during wireless power transmission.

According to an aspect of the present invention, there is provided a magnetic resonance imaging method for a monorail,

A radio power transmission system for a monorail, wherein the power supply module of the radio power transmission system includes an I-shaped beam, a ferrite core provided inside the I-shaped beam, and a body provided at a predetermined interval from the I- Shaped beam, wherein the I-shaped beam has a predetermined space for inserting a power line, and further includes a ferrite core skeleton in addition to a part of the outer side of the I-shaped beam, wherein the skeleton is included in the feed module The ferrite cores are disposed in parallel with the ferrite core in a space between the spaced apart portions, and the ferrite cores are additionally provided on the surface of the body facing the power feeding module and a part of the surface of the power feeding module, And a grate-like structure is padded therebetween.

The power module prevents the power line from being exposed to the outside by a certain space in which the power line can be inserted, and the skeleton and the frying structure are attached to only a part of the left and right edges to cause wear and heat generation by the auxiliary wheels Can be reduced.

The feed module further comprises a ferrous structure of a ferrite core in a vertical direction on a surface facing the feed module and a part of a surface of the feed module, The direction of the induced magnetic field flowing out to the pickup module side can be adjusted in the direction toward the pickup module.

According to the present invention, there is an effect of providing a monorail that reduces power loss according to a power supply line during wireless power transmission.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the principle of a wireless power transmission system according to the prior art; FIG.
FIG. 2 is a view showing the structure of a monorail without a separate ferrite core according to the prior art and the shape of a magnetic field formed on a conventional monorail
3 is a view showing the structure and arrangement of the monorail according to the present invention;
4 is a view showing the shape of a magnetic field formed on a monorail having a separate ferrite core according to the present invention
Fig. 5 is a perspective view showing the structure of the monorail according to Fig. 3,
Fig. 6 is a transparent perspective view showing the structure of the monorail according to Fig.
Fig. 7 is a right side view showing the structure of the monorail according to Fig. 3

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a diagram illustrating a principle of a wireless power transmission scheme according to the related art. 2 is a view showing the structure of a monorail 1 without a separate ferrite core 40 and the shape of a magnetic field formed on a conventional monorail 1 according to the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 briefly describe a wireless electric vehicle to which a wireless power transmission system is applied. The wireless power transmission system includes a power supply module and a pick-up module.

The feed module is divided into segment type to generate a high frequency current and use a feed inverter to control the resonance with high efficiency and a feed rail to generate and provide EMF (Electro Motive Force) for driving an electric car buried under the road Respectively. The pickup module includes a collecting pick-up device mounted on the lower portion of the electric vehicle for guiding the EMF generated from the power feeding module in a noncontact manner, a regulator for charging the battery for driving the electric vehicle during stopping or traveling, And an inverter for driving a motor or the like.

Here, the current collecting pick-up device included in the power feeding rail and the pickup module included in the power feeding module is generally manufactured using a ferrite core, but the present invention is not limited thereto and any material having the same or similar characteristics may be used. Member can be used. Ferrite is made of a magnetic material obtained by sintering a mixture of iron oxide, zinc oxide, manganese oxide, nickel oxide, or the like. Generally, the ferrite forms an induction magnetic field well by current and variously forms a magnetic field in a frequency range of several KHz to several tens KHz Can be used. In addition, since the frequency band is relatively high, it can be formed smaller in size than the capacity, and it is mainly used in a wireless power transmission system because it can be manufactured in a light weight and has a high efficiency.

A brief description of the wireless power transmission method is as follows. An electric current is supplied to an induction coil provided in a power supply module to generate an induced magnetic field. The induced magnetic field is collected by a pick-up module to charge the self- And can be used as power for driving. Thus, the capacity of the battery mounted on the electric vehicle can be greatly reduced, and the long-distance battery can be traveled without a separate charging time.

Fig. 3 is a view showing the structure and arrangement of the monorail 1 according to the present invention. 4 is a view showing the shape of a magnetic field formed on a monorail 1 having a separate ferrite core 40 according to the present invention. Fig. 5 is a perspective view showing the structure of the monorail 1 according to Fig. 3 on the basis of the rear surface. 6 is a transparent perspective view showing the structure of the monorail 1 according to Fig. 7 is a right side view showing the structure of the monorail 1 according to Fig.

3 to 7, the structure of the monorail 1 to which the SMFIR (Shaped Magnetic Field in Resonance for Monorail) proposed by the present invention is applied has a general I-beam structure And additionally has a framework formed of a ferrite core 40 material. In addition, a space for inserting a power line 30 is formed at an upper end or a lower end of the I-beam 10 to form a structure in which the power line 30 is not exposed to the outside. Wherein the skeleton can be arranged parallel and parallel to the space between the spaced distances of the ferrite cores 40 constituting the conventional monorail 1.

Here, the SMFIR (Shaped Magnetic Field in Resonance for monorail) is a technology that allows an electric vehicle to be charged in a moving state. The electric power line installed under the road is about 20 kHz in the inversion device controlled by the constant current output. Electromagnetic fields can be generated by receiving AC electricity. Phase electric current of 380 V or 440 V, which is a typical industrial electric power, through the power inverter. For example, when it is applied to a bus, the capacitance of the inverter can be selected in the range of 100 to 200 kW and can be expanded according to the required electric load. The pick-up coil is typically attached to the underside of the electric vehicle and is tuned to a resonant frequency of 20 kHz. Also, for the same purpose, as shown in FIG. 4, an optimized shape is designed and exposed to the magnetic field. In this way, the transmission efficiency can be maximized while the leakage magnetic field is reduced outside the design-oriented space. The purpose of the design is to obtain maximum power transmission efficiency to a predetermined required power capacity by optimizing the equal power supply. The application range of the magnetic field by the pickup device is shown in Fig. This system is called a so-called dual-type power supply system because of the shape of these magnetic fields.

As shown in FIG. 2, a general monorail 1 includes a body portion 20 spaced apart from the I-shaped beam 10 by a predetermined distance. In the present invention, as shown in FIG. 5, a ferrite core 40 (in the form of a rib) is formed on the face of the body 20 facing the monorail 1 and on the back face of the monorail 1, ). At this time, the reason why the sash structure is applied in the vertical direction is to increase the amount of the magnetic force lines coming into the pickup module by guiding the magnetic field diffracted so as to form a spiral in the outward direction of the body 20 in the direction of the pickup module. In addition, the ferrite core 40 applied here can reduce wear and heat due to the auxiliary wheels by attaching only a part of the left and right corners.

As a result, as shown in Fig. 4, the ferrite core 40 provided in the monorail 1 is centered, and is formed to show the shape of the dense induction magnetic field. Therefore, by additionally providing the ferrite core 40 in the conventional monorail 1, the magnetic field discharged or discharged to the outside is reduced and the shape of the magnetic field for directing a large number of lines of magnetic force toward the side of the pickup module .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

1: Monorail
10: beam 20: body
30: power line 40: additional ferrite core

Claims

1. A wireless power transmission system for a monorail,
Among the wireless power transmission systems,
An I-shaped beam, a ferrite core disposed within the I-shaped beam, and a body spaced apart from the I-shaped beam by a predetermined distance,
Wherein the I-shaped beam has a predetermined space for inserting a power line,
And a skeleton of a ferrite core material in addition to a part of the outer side of the I-shaped beam, wherein the skeleton is disposed in parallel with the ferrite core in a space between spaced apart ferrite cores included in the feed module,
Wherein a ferrite structure of a ferrite core material is additionally formed on a surface of the body facing the power feeding module and a part of a surface of the power feeding module in an up and down direction.

The method according to claim 1,
The feed module
The power line is prevented from being exposed to the outside by a predetermined space into which the power line can be inserted,
Wherein the skeleton and the frying structure are attached to only part of the left and right edges to reduce wear and heat generated by the auxiliary wheels.

The method according to claim 1,
The feed module
A ferrite structure of a ferrite core material is additionally provided in a vertical direction on a surface facing the power feeding module and a part of a surface of the power feeding module,
Wherein the direction of the induction magnetic field generated in the power feeding module and diffracted to the outside is adjusted in the direction toward the pickup module.