KR20190027629A - Coil Assembly For Wireless Charging - Google Patents

Abstract

The present invention relates to a coil assembly for wireless charging and a wireless power transmission device in which the coil assembly for wireless charging is installed. According to an embodiment of the present invention, the coil assembly installed in a wireless power transmission device comprises: a substrate; a first coil disposed on one surface of the substrate; and second and third coils disposed on the other surface of the substrate. Accordingly, the present invention provides a coil assembly having excellent heating characteristics and durability and a wireless power transmission device in which the coil assembly is installed.

Description

[0001] Coil Assembly For Wireless Charging [0002]

The present invention relates to wireless charging technology, and more particularly, to a wireless charging coil assembly and a wireless power transmitter equipped with the same.

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer And thereafter, a method of radiating electromagnetic waves such as radio waves, lasers, high frequencies, and microwaves to transfer electrical energy has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

Up to the present, energy transmission using radio may be roughly classified into a magnetic induction method, an electromagnetic resonance method, and an RF transmission method using a short wavelength radio frequency.

In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, . The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.

The self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents. The self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.

Short wavelength wireless power transmission - simply, RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.

Wireless power transmission technology can be used in various fields such as automobile, IT, railroad, home appliance industry as well as mobile.

Wireless charging can increase the temperature of the charged surface during transmission of power to the primary coil, which is the transmit coil, and the secondary coil, which is the receive coil, during power transfer. At this time, when a temperature higher than a reference value is detected, the wireless power transmission apparatus should stop the power transmission until the temperature becomes normal.

It is important to prevent overheating by accurate temperature measurement because overheating can cause malfunction and damage of wireless power receiving apparatus as well as wireless power transmitting apparatus. If the overheating determination is wrong, the charging may be stopped unnecessarily and the charging time may become longer.

Therefore, accurate temperature measurements must be made internally within the wireless power transmitter.

It is an object of the present invention to provide a durable coil assembly and a wireless power transmitter equipped with the same.

SUMMARY OF THE INVENTION The present invention provides a coil assembly with improved heating characteristics by disposing coils on both sides of a substrate without overlap, and a wireless power transmitter equipped with the same.

SUMMARY OF THE INVENTION The present invention provides a coil assembly and a radio power transmitter equipped with the coil assembly capable of minimizing inter-coil interference by arranging coils on both sides of a substrate without overlapping, and capable of accurately measuring temperature by coil.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The present invention can provide a wireless charging coil assembly and a wireless power transmission device equipped with it.

A coil assembly mounted on a wireless power transmission apparatus according to an embodiment of the present invention may include a substrate, a first coil disposed on one side of the substrate, and a second coil and a third coil disposed on the other side of the substrate .

The antenna may further include a short-range wireless communication antenna disposed on one side of the first coil so as not to overlap with the first coil.

The short-range wireless communication antenna may be pattern-printed on the substrate.

The coil assembly may further include a terminal disposed on one side of the substrate, and the coil assembly and the control circuit board may be electrically connected through the terminal.

The coil assembly may further include a temperature sensor disposed on a corresponding surface of the substrate corresponding to each of the coils disposed on the one surface and the other surface.

Here, the temperature sensor may be disposed at the center of the inner diameter of the coil.

The coil assembly may further include a magnetic shielding member disposed between the other surface and the control circuit board.

The coil assembly may further include at least one hole penetrating the one surface and the other surface of the substrate, and the coil assembly may be disposed at both ends of the second coil and the third coil and on the other surface through the at least one hole. The temperature sensor may be connected to the terminal.

Further, the second coil and the third coil may be disposed on the other surface without overlapping each other.

A wireless power transmission apparatus for transmitting wireless power to a wireless power receiving apparatus according to another embodiment of the present invention includes a coil assembly and a control circuit board electrically connected to the coil assembly, And may include a first coil disposed on one side of the substrate and a second coil and a third coil disposed on the other side of the substrate.

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, but, on the contrary, And can be understood and understood.

Effects of the method and apparatus according to the present invention will be described as follows.

The present invention has the advantage of providing a durable coil assembly and a wireless power transmitter with it.

Further, the present invention has an advantage of providing a coil assembly and a wireless power transmitter equipped with the same with improved heating characteristics by disposing coils on both sides of a substrate without overlapping.

The present invention also provides a coil assembly and a radio power transmitter equipped with the coil assembly, in which coils are not overlapped on both sides of a substrate to minimize inter-coil interference, and an accurate temperature measurement is possible.

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

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.
4A and 4B are views for explaining a coil assembly for wireless power transmission according to an embodiment of the present invention and a wireless power transmission apparatus equipped with the same.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case where it is described as being formed "above" or "below" each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, in the case of "upper (upper) or lower (lower)", it may include not only the upward direction but also the downward direction based on one component.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmission device, a wireless power transmitter, and the like are used in combination. Also, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, a receiving apparatus, Etc. may be used in combination.

The transmitter according to the present invention may be configured as a pad, a cradle, an access point (AP), a small base station, a stand, a ceiling, a floor, And may transmit wireless power to the power receiving device. To this end, the transmitter may comprise at least one radio power transmission means. Here, the radio power transmission means may be various non-electric power transmission standards based on an electromagnetic induction system in which a magnetic field is generated in a power transmitting terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving terminal coil under the influence of the magnetic field. For example, the wireless power transmission means may include an electromagnetic induction wireless charging technique as defined in a wireless charging technology standards organization such as Wireless Power Consortium (WPC), Power Matters Alliance (PMA), and the like.

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means and may receive wireless power from two or more transmitters at the same time. Here, the wireless power receiving means may include, but is not limited to, an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC), Power Matters Alliance (PMA), Qi and the like.

A wireless power receiver according to the present invention may be mounted on one side of a transportation device, but is not limited thereto, and may be a device equipped with wireless power receiving means according to the present invention to charge a battery.

1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.

Referring to FIG. 1, the wireless charging system includes a wireless power transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission. In another example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 perform out-of-band communication in which information is exchanged using a different frequency band different from the operating frequency used for wireless power transmission .

For example, information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include control information as well as status information of each other. Here, the status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but the present invention is not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may be provided.

 For example, the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the present invention is not limited thereto, and the wireless power transmitting terminal 10 may transmit information Lt; / RTI >

In the half duplex communication mode, bidirectional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted only by any one device at any time.

The wireless power receiving terminal 20 according to an embodiment of the present invention may acquire various status information of the electronic device 30. [ For example, the status information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, And is information obtainable from the electronic device 30 and available for wireless power control.

In particular, the wireless power transmitting terminal 10 according to an embodiment of the present invention can transmit a predetermined packet indicating whether or not to support fast charging to the wireless power receiving terminal 20. The wireless power receiving terminal 20 can inform the electronic device 30 of the connected wireless power transmitting terminal 10 when it is confirmed that it supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.

Also, the user of the electronic device 30 may select the predetermined fast charge request button displayed on the liquid crystal display means to control the wireless power transmitting terminal 10 to operate in the fast charge mode. In this case, the electronic device 30 can transmit a predetermined fast charge request signal to the wireless power receiving terminal 20 when the quick charge request button is selected by the user. The wireless power receiving terminal 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the same to the wireless power transmitting terminal 10 to switch the general low power charging mode to the fast charging mode.

2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.

For example, as shown in 200a, the wireless power receiving terminal 20 may include a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices may be connected to one wireless power transmitting terminal 10, Charging may also be performed. At this time, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses in a time division manner, but it is not limited thereto. In another example, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses using different frequency bands allocated to the wireless power receiving apparatuses.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus 10 is set to at least one of the required power amount for each wireless power receiving apparatus, the battery charging state, the power consumption amount of the electronic apparatus, Can be determined adaptively based on

As another example, as shown in 200b, the wireless power transmitting terminal 10 may be composed of a plurality of wireless power transmitting apparatuses. In this case, the wireless power receiving terminal 20 may be connected to a plurality of wireless power transmission apparatuses at the same time, and may simultaneously receive power from connected wireless power transmission apparatuses to perform charging. At this time, the number of wireless power transmission apparatuses connected to the wireless power receiving terminal 20 is adaptively set based on the required power amount of the wireless power receiving terminal 20, the battery charging status, the power consumption amount of the electronic apparatus, Can be determined.

3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.

As an example, the wireless power transmitter may be equipped with three transmit coils 111, 112, 113. Each of the transmission coils may be disposed such that a portion of the transmission coils overlaps with the other transmission coils. However, this is merely an example, and the transmission coils may be disposed without overlapping one another or with one transmission coil.

The wireless power transmitter sequentially transmits predetermined sensing signals 117, 127 (e.g., digital ping) for sensing the presence of a wireless power receiver through each transmit coil in a predefined sequence.

3, the wireless power transmitter sequentially transmits the detection signal 117 when the primary sensing signal transmission procedure shown in the reference numeral 110 is started, and outputs a predetermined response signal - For example, a signal strength indicator 116 or a signal strength packet may be referred to as a signal strength indicator for convenience of explanation. The received transmission coils 111 and 112 can be identified. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 when the secondary detection signal delivery procedure shown in the reference numeral 120 is started, and when the signal strength indicator 126 indicates that the power of the transmission coils 111 and 112 It is possible to control the transmission efficiency (or charging efficiency) - that is, the alignment state between the transmitting coil and the receiving coil - to identify a good transmitting coil and to allow power to be delivered through the identified transmitting coil, have.

As shown in FIG. 3, the reason why the wireless power transmitter performs the two detection signal transmission procedures is to more accurately identify to which transmission coil the reception coil of the wireless power receiver is well aligned.

If the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112 as shown in the aforementioned numerals 110 and 120 of FIG. 3, Selects a transmission coil having the best alignment based on the received signal strength indicator 126 in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil .

4A and 4B are views for explaining a coil assembly for wireless power transmission and a wireless power transmission device in which the same are mounted, according to an embodiment of the present invention.

The coil assembly according to the present embodiment may be configured to include three transmission coils.

As shown in FIGS. 4A to 4B, the transmission coils constituting the coil assembly in this embodiment may be disposed on both sides of the substrate on which the near field communication (NFC) antenna is pattern-printed.

For convenience of explanation, three transmission coils disposed on both sides of the substrate will be referred to as a first coil, a second coil, and a third coil. The transmission coil according to the present embodiment may be attached to the substrate by winding the coated lead wire in a circular shape, but this is merely one embodiment, and another example may be a patterned printed on a substrate or a conductive metal plate The etched coil may be attached to the substrate.

Hereinafter, the configuration of the first surface 410 of the coil assembly 400 will be described with reference to FIG. 4A.

The first surface 410 of the coil assembly 400 includes a substrate 411, a first coil 412, an NFC antenna 413, a first temperature sensor 414, a terminal 415, 406, a third hole 403, a fourth hole 404, a fifth hole 405, and a sixth hole 406. The first hole 401, the second hole 402, the third hole 403, the fourth hole 404, ). ≪ / RTI >

Here, the NFC antenna 413 may be pattern-printed on the substrate 411 to be integrated with the substrate 411, but if it is only one embodiment, for example, the NFC antenna 413 may be separately bonded Or may be attached to the substrate 411 using a member.

Reference numeral 410 denotes a plan view corresponding to the first surface 410 of the coil assembly 400 and reference numeral 420 denotes a cross-sectional view showing a cut surface when the first surface 410 is cut along the dotted lines a1 to a2.

As shown in the drawing 420, the first coil 412 and the NFC antenna 413 constituting the second layer can be disposed on the substrate 411 without overlapping each other. The first temperature sensor 414 may be disposed at the center of the inner diameter of the first coil 412, but is not limited thereto.

Referring to reference numeral 420, the second coil 421 and the third coil 421 may be disposed on the third layer without overlapping each other. The second temperature sensor 424 and the third temperature sensor 425 may be disposed at the center of the inner diameters of the second coil 421 and the third coil 425, but are not limited thereto.

The coil assembly 400 according to the present invention can arrange the coils on both sides of the substrate 411 so that the coils do not directly overlap with each other so that the heat generated by the transmission coil can be evenly Can be distributed.

The coil assembly 400 according to the present invention can improve the heat generation characteristic compared with the conventional products having the superposed coil structure.

The coil assembly 400 according to the present invention includes the first coil 412, the second coil 421 and the third coil 422 on both sides of the substrate 411 as a first layer, So that the heat generated in the coils of the other coil can be minimized. In addition, there is an advantage that accurate temperature measurement can be performed for each coil.

In addition, since the coil assembly 400 according to an embodiment of the present invention can directly attach coils or pattern print on both sides of the substrate without stacking the coils by using an adhesive member on one side of the substrate, Lt; / RTI >

421, 422, both ends of the NFC antenna, temperature sensors 414, 422, 424, 422, 424, 422, 424, And 425 may be separately or integrally mounted.

The second coil 421 disposed on the third layer and both ends of the third coil 422 and the second temperature sensor 424 and the third temperature sensor 424 are connected to the first through sixth And may be electrically connected to the terminal 415 through the holes 401 to 406.

A magnetic shielding material 423 may be disposed on the fourth layer. The magnetic shielding agent 423 may include a control circuit board 426 for controlling the overall operation of the wireless charging device. The magnetic shielding agent 423 may be disposed on the control circuit board 426 As shown in FIG. For example, the magnetic shielding material 423 may be ferrite, but is not limited thereto.

The coil assembly 400 and the control circuit board 426 may be electrically connected through a terminal 415.

Here, the control circuit board 426 includes a power terminal for receiving an external power source, a microprocessor for controlling the various circuit elements for converting the external power source to generate a power signal for wireless charging, and a wireless power receiver And various circuit elements for collecting sensing information of at least one of temperature, current, voltage, and electrostatic capacity at a specific position of the wireless power transmission apparatus to determine overheat, overcurrent, overvoltage, etc. .

FIG. 4B illustrates the configuration of the second side 430 of the coil assembly 400. FIG.

Reference numeral 430 is a plan view corresponding to the second surface 430 of the coil assembly 400 and reference numeral 440 is a cross-sectional view showing a cut surface when the second surface 430 is cut along the dotted lines b1 to b2.

The second surface 430 of the coil assembly 400 includes a substrate 411, a second coil 421, a third coil 422, a second temperature sensor 424, a third temperature sensor 425, To sixth holes (401 to 406).

Referring to reference numeral 430, the second coil 421 and the third coil 421 may be disposed on the substrate 411 without overlapping each other. A second temperature sensor 424 and a third temperature sensor 425 may be disposed on one side of the inner center of the second coil 421 and the third coil 422, respectively.

The line branched from one side of the inner diameter of the second coil 421 and the line branched from the second temperature sensor 424 pass through the second hole 402 and the third hole 403, And may be connected to the terminal 415 disposed on the first surface 410.

Similarly, the line branched from the inner diameter side of the third coil 422 and the line branched from the third temperature sensor 425 pass through the sixth hole 406 and the fifth hole 405, respectively, and pass through the coil assembly 400 To the terminal 415 disposed on the first side 410 of the first housing 410. [

Referring to reference numeral 440, a magnetic shielding member 423 may be disposed on the fourth layer of the coil assembly 400.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (10)

A coil assembly mounted on a wireless power transmission device,
Board;
A first coil disposed on one surface of the substrate; And
A second coil and a third coil disposed on the other surface of the substrate,
. ≪ / RTI > The method according to claim 1,
And a short range wireless communication antenna disposed on the one side of the first coil so as not to overlap the first coil. 3. The method of claim 2,
Wherein the short-range wireless communication antenna comprises a coil assembly The method according to claim 1,
Further comprising a terminal disposed on one side of the substrate, wherein the coil assembly and the control circuit board are electrically connected through the terminal. 5. The method of claim 4,
And a temperature sensor disposed on a corresponding surface of the substrate corresponding to each of the coils disposed on the one surface and the other surface. 6. The method of claim 5,
Wherein the temperature sensor is disposed in the center of the inner diameter of the coil. 5. The method of claim 4,
And a magnetic shielding member disposed between the other surface and the control circuit board. 6. The method of claim 5,
Wherein at least one hole penetrating through the one surface and the other surface of the substrate is provided, and the temperature sensor disposed at both ends of the second coil and the third coil and the other surface through the at least one hole, To the coil assembly. The method according to claim 1,
And the second coil and the third coil are disposed on the other surface without overlapping each other. A wireless power transmission apparatus for transmitting wireless power to a wireless power receiving apparatus,
Coil assembly; And
A control circuit board electrically connected to the coil assembly,
/ RTI >
The coil assembly
Board;
A first coil disposed on one surface of the substrate; And
A second coil and a third coil disposed on the other surface of the substrate,
And a radio frequency generator.

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