KR20180022523A - Apparatus for providing wireless power - Google Patents

Abstract

The present invention relates to a wireless power transmission apparatus with improved wireless power transmission efficiency. The wireless power transmission apparatus according to an embodiment of the present invention comprises: a receiving coil surrounding a surface of a rotating body; and a transmission coil part surrounding the receiving coil, wherein the receiving coil can include first parts in parallel with a major axis of the rotating body, and a second part connecting one ends of the first parts.

Description

[0001] APPARATUS FOR PROVIDING WIRELESS POWER [0002]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio power transmission apparatus, and more particularly to a radio power transmission apparatus disposed on a rotating body surface.

Wireless power transmission can be classified into an electromagnetic wave radiation method and an inductive coupling method. The magnetic induction coupling method can be classified into a simple inductive coupling method and a resonant coupling method depending on the resonance coupling.

In simple inductive coupling, the power source drives the primary coil to form a magnetic field that varies with time. A time-varying magnetic field causes a voltage across the secondary coil. The induced voltage is transferred to the load resistance. Wireless power transmission using simple inductive coupling is widely used in electric appliances including electric toothbrushes. However, the inductive coupling method has a problem of low transmission efficiency in long-distance power transmission, heat generation due to eddy current, and charging of plural devices.

The resonant coupling scheme is based on the combination of attenuation waves in which electromagnetic waves travel from transmitter to receiver through a short - range electromagnetic field when the transmitter and the receiver resonate at the same frequency.

Therefore, energy is transmitted only when the resonant frequencies of the transmitter and the receiver are the same, and unused energy can be re-absorbed. Also, unlike other power transmission methods, it does not affect the surrounding machines or human body. As a result, the resonant coupling method can transmit power over a long distance compared to the inductive coupling method.

SUMMARY OF THE INVENTION The present invention provides a wireless power transmission apparatus with improved wireless power transmission efficiency.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

A wireless power transmission apparatus according to an exemplary embodiment of the present invention includes a receiving coil that surrounds a surface of a rotating body and a transmitting coil portion that surrounds the receiving coil, the receiving coil includes first portions that are parallel to the major axis direction of the rotating body And a second portion connecting one ends of the first portions.

According to the embodiment of the present invention, a receiving coil having first portions parallel to the major axis direction (i.e., the X direction) of the rotating body is disposed so as to surround the surface of the rotating body, And can be coupled to the receiving coil between the part and the transmitting coil part. Accordingly, the transmission efficiency of the radio power transmission can be increased by increasing the magnetic field coupling coefficient between the transmission coil and the reception coil, preventing a magnetic field from being formed in the rotating body, .

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a perspective view of a wireless power transmission apparatus attached to a rotating body surface according to an embodiment of the present invention. FIG.
1B is a cross-sectional view of a wireless power transmission device attached to a surface of a rotating body according to an embodiment of the present invention.
2A is a perspective view of a wireless power transmission apparatus attached to a surface of a rotating body according to an embodiment of the present invention.
FIG. 2B is a cross-sectional view illustrating a wireless power transmission device attached to a surface of a rotating body according to an embodiment of the present invention.
3 is a schematic view showing a receiver installed on the surface of the rotating body.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms 'comprises' and / or 'comprising' mean that the stated element, step, operation and / or element does not imply the presence of one or more other elements, steps, operations and / Or additions.

In addition, the embodiments described herein will be described with reference to cross-sectional views and / or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have schematic attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific types of regions of the elements and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a perspective view of a wireless power transmission apparatus attached to a rotating body surface according to an embodiment of the present invention. FIG. 1B is a cross-sectional view of a wireless power transmission device attached to a surface of a rotating body according to an embodiment of the present invention.

1A and 1B, the wireless power transmission apparatus may include a receiving coil section 10, and a transmitting coil section 20. [ The receiving coil part 10 can cover the surface of the rotating body 2 and the transmitting coil part 20 can cover the receiving coil part 10. [

The rotating body 2 may be a columnar metal column. The rotating body 2 may be in a cylindrical shape elongated in the first direction X. [ The rotating body 2 may have a major axis direction in the first direction X. [ In one example, the rotating body 2 may correspond to a part of the production facility requiring a rotating operation. The shielding film 4 can cover the surface of the rotating body 2. The shielding film 4 can prevent the magnetic field 30 from penetrating into the rotating body 2. [

The receiving coil part 10 may include a first flexible substrate 12 and a receiving coil 14. [ The first flexible substrate 12 may cover the surface of the rotating body 2. [ The first flexible substrate 12 can be in physical contact with the rotating body 2. The first flexible substrate 12 may have insulating properties. The first flexible substrate 12 may be, for example, a plastic substrate.

The receiving coil 14 can be disposed on the first flexible substrate 12. [ The receiving coil 14 can be physically spaced from the rotating body 2. [ The receiving coil 14 can be fixed on the surface of the first flexible substrate 12. [ The receiving coil 14 may extend along the edge of the first flexible substrate 12. [ The number of turns of the receiving coil 14 may be one. The receiving coil 14 may include first portions 14a and second portions 14b. The first portions 14a may extend in a first direction X and be parallel to each other. For example, the first portions 14a may be parallel to the major axis direction of the rotator 2. The second portion 14b extends in the second direction Y and may connect one ends of the first portions 14a. The receiving coil 14 can receive the radio-frequency power transmitted from the transmitting coil 24 of the transmitting coil part 20 by radio.

As another example, the receiving coil 14 may be disposed directly on the surface of the shielding film 4, although not shown in the drawing. That is, the first flexible substrate 12 may be omitted.

The transmitting coil part 20 can be placed on the receiving coil part 10. [ The transmitting coil part 20 can be supported by an external structure. The transmitting coil section 20 may include a second flexible substrate 22 and a transmission coil 24. [ The second flexible substrate 22 may be spaced apart from the first flexible substrate 12 to cover the first flexible substrate 12. The second flexible substrate 22 may have insulating properties. The second flexible substrate 22 may be, for example, a plastic substrate.

The transmission coil 24 may be disposed on the second flexible substrate 22. [ For example, the transmission coil 24 may be fixed on the inner surface of the first flexible substrate 22. [ The transmission coil 24 may extend along the edge of the second flexible substrate 22 and the number of turns of the transmission coil 24 may be equal to the number of turns of the reception coil 14. [ For example, the number of turns of the transmitting coil 24 may be one. The transmit coil 24 may include third portions 24a and fourth portions 24b. The third portions 24a may extend in a first direction X and be parallel to each other. For example, the third portions 24a may be parallel to the major axis direction of the rotator 2. The fourth portion 24b extends in the second direction Y and may connect one ends of the third portions 24a. The transmission coil 24 can wirelessly transmit high-frequency power according to a power source applied by a power application unit (not shown).

The magnetic field 30 generated by the current flowing through the transmitting coil 24 can be directed toward the receiving coil 14 perpendicular to the surface of the rotating body 2 as shown in Fig. That is, the high frequency power can be wirelessly transmitted from the transmitting coil 24 to the receiving coil 14. [ For example, the magnetic field 30 may not penetrate into the rotating body 2 by the shielding film 4. Even if a part of the magnetic field 30 which is not shielded by the shielding film 4 penetrates into the rotating body 2, the magnetic fields 30 penetrating in opposite directions are offset from each other, so that the magnetic field 30 It may not exist.

According to the embodiment of the present invention, the receiving coil 14 having the first portions 14a parallel to the major axis direction (i.e., the X direction) of the rotating body 2 is wrapped around the surface of the rotating body 2 So that the magnetic field 30 transmitted from the transmitting coil 24 can be coupled to the receiving coil 14 between the receiving coil part 10 and the transmitting coil part 20. [ Thus, the magnetic field coupling coefficient between the transmission coil 24 and the reception coil 14 can be increased, and the transmission efficiency of the radio power transmission can be increased. Therefore, the electric power can be smoothly supplied to the rotating body 2.

According to the embodiment of the present invention, it is possible to prevent the magnetic field from being formed in the rotating body 2, and to prevent the electric power transmitted by the magnetic field from being turned into heat and thus to lose power.

2A is a perspective view of a wireless power transmission apparatus attached to a surface of a rotating body according to an embodiment of the present invention. FIG. 2B is a cross-sectional view illustrating a wireless power transmission device attached to a surface of a rotating body according to an embodiment of the present invention. For simplicity of explanation, the same reference numerals are used for components substantially the same as those of the embodiment shown in Figs. 1A and 1B, and a description of corresponding components will be omitted.

Referring to FIGS. 2A and 2B, when a large inductance of a coil is required according to the design of a wireless power transmission apparatus and / or when another inductance of the coil is required depending on the type of the wireless power transmission system, And the number of turns of the receiving coil 14 can be increased. When the wireless power transmission system is of a resonance type, two kinds of resonance coils and the power supply coils can be simultaneously mounted on the receiver or the transmitter. The number of turns of the transmission coil 24 and the number of turns of the reception coil 14 may be two or more and the number of turns of the transmission coil 24 and the number of turns of the reception coil 14 may be equal to each other.

3 is a schematic view showing a receiver of a wireless power transmission apparatus installed in a rotating body.

Referring to FIG. 3, a receiver 100 electrically connected to the receiving coil 14 may be provided on the surface of the rotating body 2. The receiver 100 can supply power to various sensors mainly used in the rotating body 2. [ The receiver 100 may include a rectifier circuit 101 and a DC / DC converter 103. The rectifying circuit 101 can rectify the AC signal received by the coil and convert it into a DC signal. The DC / DC converter 103 can convert the voltage converted from the rectifying circuit 101 to DC into a voltage suitable for the load. Various signals sensed by the sensor, such as the force applied to rotate the rotating body 2 and / or the temperature of the rotating body, can transmit data to the outside in a wireless communication method.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and not restrictive in every respect.

Claims (1)

A receiving coil surrounding the surface of the rotating body; And
And a transmitting coil part surrounding the receiving coil,
Wherein the receiving coil includes first portions parallel to the major axis direction of the rotating body, and a second portion connecting one ends of the first portions.

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