KR20170107877A - Wireless Power Transfer - Google Patents

Abstract

A wireless power transmission apparatus according to an embodiment of the present invention includes a substrate, a shielding sheet attached to a lower portion of the substrate, a shielding sheet formed on the substrate and adapted to transmit a radio power to the wireless power receiving apparatus, A first penetrating member passing through the substrate and the shielding sheet to connect one end of the coil and the output end of the AC voltage, and a second penetrating member passing through the substrate and the shielding sheet to connect the output end of the AC voltage with the other end of the coil, And a penetrating member.

Description

[0001] Wireless Power Transfer [0002]

The present invention relates to a wireless power transmission apparatus, and more particularly, to a wireless power transmission apparatus that includes a substrate on which a through hole is formed and a penetrating member inserted into a shielding sheet to connect one end and the other end of the coil, (Electro Magnetic Interference < RTI ID = 0.0 > (EMI) < / RTI >

2. Description of the Related Art In recent years, there has been a surge in the number of users of mobile devices capable of wireless communication regardless of places such as various smart phones and tablet PCs. The number of users of such mobile devices is increasing rapidly. In order to drive such devices, a power source, a battery, and the like are essential. In order to charge the battery, most of them are connected by wired power and charge (wired charge).

However, when wired charging is used, various adapters and connectors must be installed or carried in order to connect to an outlet or an outlet, so that not only an aesthetic effect on the interior can be deteriorated but also the working efficiency may be deteriorated due to complicated line connections , And, in severe cases, fire. In addition, if the battery of the mobile device is exhausted and there is not an appropriate connector, it may inconvenience that the device can not be used due to failure to supply power.

For example, in the case of a display device such as a wall-mounted TV which has been recently launched, the beauty of the display device is reduced by a complicated power supply line or various cables. Even if the display device is placed behind the TV in order not to expose it to the outside, Or risk may occur.

Accordingly, in order to solve such a problem, wireless power transmission technologies for wirelessly transmitting power have been developed.

In recent years, attempts have been made to transmit power with a high efficiency to a longer distance by using magnetic resonance instead of a simple magnetic coupling method in order to perform wireless power transmission to a long distance.

1 is a diagram illustrating a conventional wireless power transmission apparatus.

Referring to FIG. 1, a conventional wireless power transmission apparatus includes a power conversion unit 11, a control unit 12, resonance capacitors 13a and 13b, feed lines 14a and 14b, and a coil 21.

The power conversion unit 11 can convert the DC voltage supplied from the outside into an AC voltage usable for wireless power transmission. To this end, the power conversion unit 11 may include a DC-DC converter for converting a DC voltage supplied from the outside into a DC voltage having a specific voltage value, and a DC-AC converter for converting the converted DC voltage to an AC voltage.

The control unit 12 can control the voltage and the frequency to be converted by the power conversion unit 11 described above.

The resonance capacitors 13a and 13b are connected to one end and the other end of the coil 21 to be described later and are connected to the power conversion unit 11 and the control unit 12 due to a high voltage generated during resonance. EMI) phenomenon can be reduced.

The coil 21 can transmit radio power to the wireless power receiving apparatus by generating a magnetic flux from a change in current due to a change in the AC voltage converted by the power converting unit 11. [

At this time, one end and the other end of the coil 21 are connected to the power conversion unit 11 through the power supply lines 14a and 14b through the resonance capacitors 13a and 13b, respectively, thereby being able to receive the AC voltage.

In the structure of the conventional wireless power transmission apparatus, the feed lines 14a and 14b are soldered and connected to one end and the other end of the coil 21, respectively.

Thereby, a part of the power feed line 14b passes over the upper part of the coil 21 and the coil 21 and the feeder line 14b are placed on the same plane, .

The resonance capacitors 13a and 13b are mounted together on the substrate on which the power conversion unit 11 and the control unit 12 are mounted so that the gap between the substrate on which the resonance capacitors 13a and 13b are mounted and the substrate on which the coil 21 is formed There is a problem that the EMI phenomenon increases as the distance d between the electrodes increases.

According to the present invention, electromagnetic interference (EMI) phenomena can be reduced by inserting a penetrating member into a substrate having a through hole and a shielding sheet, and connecting one end and the other end of the coil located on the substrate with the output terminal of the AC power source And an object of the present invention is to provide a wireless power transmission apparatus having the same.

Another object of the present invention is to provide a wireless power transmission apparatus capable of reducing EMI phenomenon by reducing a distance between a coil and a resonance capacitor by mounting a resonance capacitor on a capacitor pad formed at one end and the other end of the coil.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including: a substrate; a shielding sheet attached to a lower portion of the substrate; A first penetrating member passing through the substrate and the shielding sheet to connect one end of the coil and the output end of the AC voltage, and a second penetrating member passing through the substrate and the shielding sheet, And a second penetrating member connecting the output ends.

In one embodiment, the wireless power transmission device includes a first resonant capacitor coupled to one end of the coil and resonating the coil at a predetermined frequency, and a second resonant capacitor coupled to the other end of the coil, As shown in FIG.

In one embodiment, the coil may be formed at one end with a first capacitor pad on which the first resonant capacitor is mounted, and with a second capacitor pad on which the second resonant capacitor is mounted.

In one embodiment, the substrate and the shielding sheet have a first through hole through which the first penetrating member is inserted corresponding to the position of one end of the coil on the substrate, and a second penetrating member corresponding to the position of the other end of the coil on the substrate A second through hole to be inserted may be formed.

In one embodiment, the wireless power transmission apparatus includes a DC-DC conversion unit for converting an externally supplied DC voltage into a converted DC voltage, a DC-AC conversion unit for converting the converted converted DC voltage into an AC voltage at a conversion frequency, And a controller for controlling the DC-DC converter and the DC-AC converter by setting the DC voltage and the conversion frequency.

According to the present invention as described above, a through-hole is inserted into a through-hole formed in a substrate and a shielding sheet, and one end and the other end of the coil are connected to an output terminal of an AC power source, EMI ") phenomenon can be reduced.

Further, the present invention has the effect of reducing the EMI phenomenon by reducing the distance between the coil and the resonance capacitor by mounting the resonance capacitor on the capacitor pad formed at one end and the other end of the coil.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a conventional wireless power transmission apparatus. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless power transmission device,
3 is a cross-sectional view of a wireless power transmission apparatus according to an embodiment of the present invention.
4 is a top view of an antenna portion of a wireless power transmission apparatus according to an embodiment of the present invention.
5 shows a coil in the form of a circular coil according to a second embodiment of the present invention.
6 is a view showing a coil of a rectangular coil type according to a third embodiment of the present invention.
7 shows a coil in the form of a triangular coil according to a fourth embodiment of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

FIG. 2 is a diagram specifically illustrating a configuration of a wireless power transmission apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, a wireless power transmission apparatus 100 according to an embodiment of the present invention may include a transmitting circuit 110 and an antenna 120. The wireless power transmission apparatus 100 shown in FIG. 2 is according to one embodiment, and its components are not limited to the embodiment shown in FIG. 2, and some components may be added, changed or deleted as needed .

The transmission circuit 110 may convert an external DC voltage into an AC voltage for wireless power transmission and supply the AC voltage to the antenna unit 120.

The transmission circuit 110 includes a DC-DC converter 111, a DC-AC converter 112, a controller 113, a sensing unit 114, an oscillation unit 115, and a communication unit 116 Lt; / RTI >

More specifically, the DC-DC converter 111 can perform a role of converting a DC voltage supplied from the outside to a converted DC voltage. At this time, the DC-DC converting unit 111 may include a rectifying circuit for rectifying the DC voltage supplied from the outside.

That is, the DC-DC converter 111 can rectify the DC voltage supplied from the outside through the rectifying circuit and convert it into the converted DC voltage. Here, the converted DC voltage may be the level of the DC voltage converted for the wireless power transmission.

The DC-AC converting unit 112 may convert the DC voltage converted by the DC-DC converting unit 111 into an AC voltage of a converting frequency. Here, the conversion frequency may be the frequency of the voltage required to supply power wirelessly.

The control unit 113 may perform the function of setting the converted DC voltage to be converted by the DC-DC converting unit 111 in response to the wireless power transmission. In addition, the controller 113 may perform the role of setting the conversion frequency of the AC voltage to be converted by the DC-AC converter 112 in response to the wireless power transmission.

That is, the control unit 113 controls the DC-DC conversion unit 111 and the DC-AC conversion unit 112 through the control of the converted DC voltage and the conversion frequency so as to output a DC voltage suitable for wireless power transmission in the transmission circuit unit 110. [ Can be controlled.

The sensing unit 114 may measure the voltage and current of the power in the process of transmitting the wireless power. More specifically, the DC voltage before conversion and the voltage of the converted DC voltage after conversion can be measured in the DC-DC converter 111, and the DC voltage before conversion can be measured by the DC-AC converter 111, The voltage of each voltage can be measured.

In one embodiment, the controller 113 and the sensing unit 114 may be configured as one microcontroller unit (MCU).

The oscillation unit 115 can generate and supply a frequency used for communication between the communication unit 116 and a wireless power receiving apparatus to be described later. The oscillation unit 115 may generate a frequency of an AC voltage supplied to the antenna unit 120.

That is, the oscillation unit 115 can generate the frequency generated by the transmission circuit unit 110 according to the intended use of the frequency.

The communication unit 116 may perform communication with the wireless power receiving apparatus to transmit and receive information required for wireless power transmission. Also, the communication unit 116 may communicate with the wireless power receiving apparatus and sense that the wireless power receiving apparatus is positioned within a preset distance to the antenna unit 120. [

The antenna unit 120 may serve to supply radio power to the wireless power receiving apparatus by generating a magnetic flux from a change in current due to a change in the AC voltage supplied from the transmission circuit unit 110. [

The antenna unit 120 may include a coil 121, a resonant capacitor 122, a substrate 123, a car seat 124, and a penetrating member 125.

The antenna unit 120 will be described in detail with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a cross-sectional view of a wireless power transmission apparatus 100 according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of an antenna unit 120 of a wireless power transmission apparatus 100 according to an embodiment of the present invention. Fig.

3 and 4, the coil 121 receives the converted AC voltage from the DC-AC converter 112 and generates a magnetic flux from a change in current due to a change in the AC voltage, And can serve as a wireless power supply source.

At this time, the coil 121 may be formed by soldering on the upper surface of the substrate 123 in a wire state or may be printed on the upper surface of the substrate 123.

Meanwhile, when the coil 121 is formed by soldering on the upper part of the substrate 123 in a wire state, the coil 121 may be a wire having a thickness smaller than the skin depth in order to prevent a current loss due to an eddy current.

When the coil 121 is printed on the upper surface of the substrate 123, the thickness of the printed coil 121 may be thinner than the skin depth to prevent current loss due to eddy currents.

Since the skin depth may differ depending on the material of the metal used as the coil 121, the thickness and thickness of the coil 121 may be determined corresponding to the material of the metal used as the coil 121.

Meanwhile, although only the symmetrical coil form shown in FIG. 4 is shown connected in a crossing manner from the lower side, it should be noted that the shape of the coil 121 according to the present invention is not limited.

FIG. 5 is a view showing a coil 121 in the form of a circular coil according to a second embodiment of the present invention, and FIG. 6 is a view showing a coil 121 in the form of a rectangular coil according to a third embodiment of the present invention And FIG. 7 is a diagram showing a coil 121 in the form of a triangular coil according to a fourth embodiment of the present invention.

Like the coil 121 shown in Figs. 5 to 7, the shape of the coil 121 may be at least one of a circular coil shape, a rectangular coil shape, and a triangle coil shape.

The resonance capacitor 122 may be connected to the coil 121 to resonate the coil 121 at a preset frequency. More specifically, the resonant capacitor 122 may be composed of the first resonant capacitor 122a and the second resonant capacitor 122b.

The first resonance capacitor 122a is connected to one end of the coil 121 to resonate the coil 121 at a preset frequency and the second resonance capacitor 122b is connected to the other end of the coil 121, The coil 121 can be resonated.

The first resonant capacitor 122a may be soldered to the top of the substrate 123 together with one end of the coil 121. The first resonant capacitor 122a may be soldered to the upper surface of the substrate 123, have. The second resonant capacitor 122b may be soldered to the upper portion of the substrate 123 together with the other end of the coil 121. [

On the other hand, when the coil 121 is printed on the upper surface of the substrate 123, a first capacitor pad 122a 'and a second capacitor pad 122b' are formed at one end and the other end of the coil 121, respectively . Also, the first resonant capacitor 122a may be mounted on the first capacitor pad 122a 'and the second resonant capacitor 122b may be mounted on the second capacitor pad 122b'.

In this case, the coil 121 in the form of a circular coil, the coil 121 in the form of a square coil, and the coil 121 in the form of a triangular coil, shown in FIGS. 5 to 7, A first capacitor pad 122a 'and a second capacitor pad 122b' may be formed at one end and the other end, respectively.

4, the first resonant capacitor 122a is mounted on the first capacitor pad 122a 'and the second resonant capacitor 122b is mounted on the second capacitor pad 122b ').

 As a result, the antenna unit 120 according to an embodiment of the present invention minimizes the distance between the coil 121 and the first resonant capacitor 122a and the second resonant capacitor 122b, It is possible to reduce the EMI phenomenon caused by the separation of the capacitor 122a and the second resonance capacitor 122b.

The substrate 123 may be formed by soldering the coil 121 on the upper part of the substrate 123 in a wire state or by printing the coil 121 on the upper part of the substrate 123 as described above.

The substrate 123 may have through holes corresponding to positions of one end and the other end of the coil 121 formed on the upper side.

More specifically, the substrate 123 may have a first through-hole at a position perpendicular to the position of one end of the coil 121, and a second through-hole at a position perpendicular to the position of the other end of the coil 121 .

A shielding sheet 124 for blocking the EMI phenomenon may be attached to the lower portion of the substrate 123. Here, the shielding sheet 124 may be made of a material having a magnetic field and may block the magnetic field radiated to the lower portion of the antenna unit 120.

In addition, the shielding sheet 124 can increase the inductance value of the antenna unit 120 to improve the efficiency of wireless power transmission.

Such a shielding sheet 124 may be composed of at least one of a ferrite, a soft magnetic metal powder composite, and an amorphous alloy. In this case, the ferrite may be at least one of a Mn-Zn series and a Ni-Zn series in the form of a sintered body, and may be a hexagonal system in a composite form. The soft magnetic metal powder composite may also include at least one of Sendust, Fe-CR, NI-Fe, Fe-SI, and Carbon Iron. In addition, the amorphous alloy may include at least one of amorphous and nanocrystalline.

A first through hole may be formed at a position perpendicular to one end of the coil 121 on the shielding sheet 124. A second through hole may be formed at a position perpendicular to the other end of the coil 121 .

That is, the substrate 123 and the shielding sheet 124 may have a first through-hole and a second through-hole formed therein, and a position perpendicular to one end and the other end of the coil 121 may be penetrated.

The penetrating member 125 may penetrate the substrate 123 and the shielding sheet 124 to electrically connect the output terminal of the AC voltage to the coil 121. [ More specifically, the penetrating member 125 may include a first penetrating member 125a and a second penetrating member 125b.

The first penetrating member 125a is inserted into a first through hole formed in the substrate 123 and the shielding sheet 124 so that the upper side is in contact with one end of the coil 121 and the lower side is in contact with the feed line Ta ).

Accordingly, the AC voltage output from the AC voltage output terminal of the DC-AC converter 112 can be applied to one end of the coil 121 through the feeder line Ta and the first penetrating member 125a in order.

 Similarly, the second penetrating member 125b is inserted into the second through hole formed in the substrate 123 and the shielding sheet 124, the upper side thereof is in contact with the tile end of the coil 121, And can be connected to the connected feeder line Tb.

Accordingly, the AC voltage output from the AC voltage output terminal of the DC-AC converter 112 can be applied to the other end of the coil 121 through the feeder line Tb and the second penetrating member 125b in order.

For this purpose, the first penetrating member 125a and the second penetrating member 125b are made of a conductive material.

Accordingly, the feeder lines Ta and Tb extend to the lower side of the shielding sheet 124 without passing over the coil 121 through the structure of the antenna unit 120 according to the present invention, Ta, and Tb) can be reduced.

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, But the present invention is not limited thereto.

100: Wireless power transmission device
110:
111: DC-DC converter 112: DC-AC converter
113: control unit 114:
115: oscillation unit 116: communication unit
120:
121: coil 122: resonant capacitor
123: substrate 124: shielding sheet
125: penetrating member

Claims (5)

Board;
A shielding sheet attached to a lower portion of the substrate;
A coil formed on the substrate for generating a magnetic flux from a change in current due to a change in AC voltage so as to transmit radio power to the radio power receiving apparatus;
A first penetrating member passing through the substrate and the shielding sheet to connect one end of the coil and an output end of the AC voltage; And
And a second penetrating member passing through the substrate and the shielding sheet to connect the other end of the coil and the output terminal of the AC voltage
Comprising a wireless power transmission device.
The method according to claim 1,
A first resonant capacitor connected to one end of the coil and resonating the coil at a predetermined frequency; And
A second resonant capacitor connected to the other end of the coil and resonating the coil at the predetermined frequency,
Lt; / RTI >
3. The method of claim 2,
The coil
Wherein a first capacitor pad on which the first resonance capacitor is mounted is formed on the one end and a second capacitor pad on which the second resonance capacitor is mounted is formed on the other end.
The method according to claim 1,
The substrate and the shielding sheet
A first through hole into which the first penetrating member is inserted is formed corresponding to a position of one end of the coil on the substrate, and a second penetrating hole is formed in the second through hole, in which the second penetrating member is inserted corresponding to the position of the other end of the coil, Wherein a through hole is formed.
The method according to claim 1,
A DC-DC converter for converting a DC voltage supplied from the outside into a converted DC voltage;
A DC-to-AC converter for converting the converted converted DC voltage into an AC voltage of a converted frequency; And
And a controller for controlling the DC-DC converter and the DC-AC converter by setting the converted DC voltage and the conversion frequency
Lt; / RTI >

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