WO2018190509A1

WO2018190509A1 - Wireless power transmitter comprising plurality of overlappingly arranged wireless power antennas

Info

Publication number: WO2018190509A1
Application number: PCT/KR2018/002364
Authority: WO
Inventors: 임성현
Original assignee: 엘지이노텍(주)
Priority date: 2017-04-14
Filing date: 2018-02-27
Publication date: 2018-10-18
Also published as: KR20180115932A

Abstract

The present invention relates to a wireless power transmitter comprising a plurality of overlappingly arranged wireless power antennas. A wireless power transmitter/receiver, according to one embodiment of the present invention, comprises: a wireless power antenna assembly comprising a plurality of wireless power antennas arranged so as to overlap with each other; and a shielding material for reflecting an electromagnetic wave generated from the wireless power antenna assembly, wherein the wireless power antenna assembly may comprise a plurality of sub-wireless power antennas arranged at the lower part of a first wireless power antenna positioned at the upper end of the assembly, or at the upper part of a second wireless power antenna positioned at the lower end of the assembly.

Description

Wireless power transmitter comprising a plurality of wireless power antennas arranged in overlap

The present invention relates to a wireless power transmitter, and more particularly, to a wireless power transmitter including a plurality of wireless power antennas arranged in overlap.

In general, as an example of an electrical connection method between a charging device and a battery for charging power to a battery, the terminal is supplied with commercial power and converted into a voltage and a current corresponding to the battery to supply electrical energy to the battery through the terminal of the battery. Supply method. This terminal supply method is accompanied by the use of a physical cable (cable) or wire. Therefore, when handling a lot of terminal supply equipment, many cables occupy considerable working space, are difficult to organize, and are not good in appearance. In addition, the terminal supply method may cause problems such as instantaneous discharge phenomenon due to different potential difference between the terminals, burnout and fire caused by foreign substances, natural discharge, deterioration of battery life and performance.

Recently, in order to solve this problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly have been proposed. In addition, since the wireless charging system was not pre-installed in some terminals in the past and the consumer had to separately purchase a wireless charging receiver accessory, the demand for the wireless charging system was low, but the number of wireless charging users is expected to increase rapidly. It is expected to be equipped with a charging function.

In general, the wireless charging system includes a wireless power transmitter for supplying electrical energy through a wireless power transmission method and a wireless power receiver for charging the battery by receiving the electrical energy supplied from the wireless power transmitter.

The wireless charging system may transmit power by at least one wireless power transmission method (eg, electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method, etc.).

For example, the wireless power transmission scheme may use various wireless power transmission standards based on an electromagnetic induction scheme that generates a magnetic field in the power transmitter coil and charges using an electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field. . Here, the electromagnetic induction wireless power transmission standard may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) or / and the Power Matters Alliance (PMA).

As another example, the wireless power transmission method may use an electromagnetic resonance method of transmitting power to a wireless power receiver located in close proximity by tuning a magnetic field generated by a transmission coil of the wireless power transmitter to a specific resonance frequency. . Here, the electromagnetic resonance method may include a wireless charging technology of a resonance method defined in an A4WP (Alliance for Wireless Power) standard device, which is a wireless charging technology standard device.

As another example, the wireless power transmission method may use an RF wireless power transmission method that transmits power to a wireless power receiver located at a far distance by putting energy of low power in an RF signal.

On the other hand, a plurality of wireless power antennas may be mounted in the wireless power transmitter for reasons of securing a wider charging area. When a plurality of wireless power antennas are arranged, the plurality of wireless power antennas may be disposed to overlap each other so that an unchargeable area does not occur.

One of the plurality of wireless power antennas overlappingly disposed may be disposed below, and the other may be disposed above. The step difference caused by the multi-layer arrangement may affect the electrical characteristics between the plurality of wireless power antennas in relation to the shielding material, and may cause difficulty in radiating heat generated from the wireless power antennas arranged above. Can be.

Therefore, when a plurality of wireless power antennas are overlapped and arranged, there is a need for an arrangement structure having the same electrical characteristics throughout the charging region and effectively dissipating heat generated from the wireless power antenna to the outside.

The present invention has been devised to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a wireless power transmitter including a plurality of wireless power antennas arranged in an overlapping manner.

The present invention provides a wireless power transmitter including a plurality of wireless power antennas, in which a wireless power antenna is additionally disposed in an empty space generated in a multi-layer arrangement, or a filler filling the empty space is provided.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to solve the above technical problem, a wireless power transmitter according to an embodiment of the present invention, a wireless power antenna assembly comprising a top wireless power antenna, two side wireless power antenna and a bottom wireless power antenna; A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly; The two side wireless power antennas disposed to be spaced apart from each other are overlapped with the upper wireless power antenna and disposed at the bottom, and the winding length of the lower wireless power antenna is the inductance of the upper wireless power antenna and the It may be determined by the inductance difference of the side wireless power antenna.

In some embodiments, the winding length of the lower wireless power antenna may be a difference between the winding length of the upper wireless power antenna and the winding length of the side wireless power antenna.

According to an embodiment, the bottom wireless power antenna may be located between the two side wireless power antennas spaced apart from each other.

According to an embodiment, the filler filling the step with the top wireless power antenna on the top of the side wireless power antenna; It may further include.

According to an embodiment, the filler may include silicon.

In addition, the wireless power transmitter according to an embodiment of the present invention, a wireless power antenna assembly including a plurality of wireless power antennas disposed to overlap each other; A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly; The wireless power antenna assembly includes: a plurality of sub wireless power antennas disposed on an upper portion of a second wireless power antenna positioned below or below a first wireless power antenna positioned at an upper portion thereof; It may include.

In some embodiments, the sub-wireless power antenna may fill a step between the first wireless power antenna and the second wireless power antenna.

In an embodiment, the sum of the winding lengths of the first wireless power antenna and the first sub-wireless power antenna positioned below the first wireless power antenna is located above the second wireless power antenna and the second wireless power antenna. It may be equal to the sum of the winding lengths of the second sub wireless power antenna.

In some embodiments, an inductance of a first combination of the first wireless power antenna and the first sub-wireless power antenna positioned below the first wireless power antenna is an upper portion of the second wireless power antenna and the second wireless power antenna. It may be equal to the inductance of the second combination of the second sub-wireless power antenna located at.

In addition, a wireless power transmitter according to an embodiment of the present invention, a wireless power antenna assembly including a first wireless power antenna, a second wireless power antenna and a third wireless power antenna; A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly; The first wireless power antenna, the second wireless power antenna and the third wireless power antenna each may be a multi-layer wireless power antenna including a lower layer wireless power antenna and an upper layer wireless power antenna.

In some embodiments, the second wireless power antenna and the third wireless power antenna may be symmetrically disposed about the first wireless power antenna.

In some embodiments, winding lengths of the first wireless power antenna, the second wireless power antenna, and the third wireless power antenna may be the same.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described in detail below by those skilled in the art. Can be derived and understood.

An effect of a wireless power transmitter including a plurality of wireless power antennas that are disposed in an overlapping manner according to an embodiment will be described below.

First, an embodiment may adjust an electrical characteristic, for example, an inductance value, through a plurality of wireless power antennas arranged in two layers.

Secondly, in one embodiment, an injection molding using a separate mold for a mounting frame for mounting a wireless power antenna is unnecessary by eliminating a step through a plurality of wireless power antennas arranged in two layers.

Third, in one embodiment, as the step difference of the plurality of wireless power antennas is eliminated and the contact area with the shielding material is increased, the thermal diffusion structure is improved, so that heat can be effectively radiated to the outside.

Fourth, in one embodiment, durability can be improved due to a filling material filling the empty space generated by the step of the plurality of wireless power antennas.

The effects obtainable in the embodiments are not limited to the effects mentioned above, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, 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 new embodiments.

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 illustrating a wireless power transmitter including a plurality of wireless power antennas according to an embodiment of the present invention.

4A to 4C are diagrams for describing a wireless power antenna assembly including three wireless power antennas according to an embodiment of the present invention.

5A to 5D are diagrams for describing a wireless power antenna assembly including a bottom wireless power antenna according to an embodiment of the present invention.

6 is a view for explaining a wireless power antenna assembly including a filler according to an embodiment of the present invention.

7A to 7E are diagrams for describing a wireless power antenna assembly including a plurality of multilayer wireless power antennas according to an embodiment of the present invention.

8A through 8D are diagrams for describing a wireless power antenna assembly including two wireless power antennas.

In accordance with an aspect of the present invention, a wireless power transmitter includes: a wireless power antenna assembly including an upper wireless power antenna, two side wireless power antennas, and a lower wireless power antenna; A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly; The two side wireless power antennas disposed to be spaced apart from each other are overlapped with the upper wireless power antenna and disposed at the bottom, and the winding length of the lower wireless power antenna is the inductance of the upper wireless power antenna and the It may be determined by the inductance difference of the side wireless power antenna.

Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In the description of the embodiments, in the case of being described as being formed at "up (up) or down (down)", "before (front) or back (back)" of each component, "up (up) or down (Below) "and" before (before) or after (behind) "include both in which the two components are in direct contact with each other or one or more other components are formed disposed between the two components.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art with respect to the related well-known technology, the detailed description thereof will be omitted.

In the description of the embodiment, the apparatus for transmitting wireless power on the wireless power charging system is a wireless power transmitter, wireless power transmitter, wireless power transmitter, wireless power transmitter, transmitter, transmitter, transmitter, transmitting side for convenience of description. A wireless power transmitter, a wireless power transmitter, and a wireless charging device will be used in combination. In addition, as a representation of a device for receiving the wireless power from the wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Terminals and the like may be used interchangeably.

Wireless charging apparatus according to the present invention may be configured in the form of a pad, a cradle, an access point (AP), a small base station, a stand, a ceiling buried, a wall, etc., one transmitter receives a plurality of wireless power It may also transmit power to the device.

For example, the wireless power transmitter may not only be used on a desk or a table, but also may be developed and applied to an automobile and used in a vehicle. The wireless power transmitter installed in the vehicle may be provided in the form of a cradle that can be fixed and mounted simply and stably.

The terminal according to the present invention is a mobile phone, smart phone, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in small electronic devices such as toothbrushes, electronic tags, lighting devices, remote controls, fishing bobbers, and the like, but is not limited thereto. The term "terminal" or "device" may be used interchangeably. The wireless power receiver according to another embodiment of the present invention may be mounted in a vehicle, an unmanned aerial vehicle, an air drone, or the like.

The wireless power receiver according to an embodiment of the present invention may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission method may include at least one of the electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method. In particular, the wireless power receiving means supporting the electromagnetic induction method may include a wireless charging technology of the electromagnetic induction method defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA) which are wireless charging technology standard organizations.

In general, the wireless power transmitter and the wireless power receiver constituting the wireless power system may exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication. Here, in-band communication and BLE communication may be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, or the like. For example, the wireless power receiver may transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching ON / OFF the current induced through the receiving coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various state information including received power strength information. In this case, the wireless power transmitter may calculate the charging efficiency or the power transmission efficiency based on the received power strength information.

Referring to FIG. 1, a wireless charging system includes a wireless power transmitter 10 that wirelessly transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 20 that receives the received power. Can be configured.

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission. As another example, the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication in which information is exchanged using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.

For example, the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other.

In detail, the state information and control information exchanged between the wireless power transceivers may establish an out-of-band communication link between the wireless power transceivers and transmit its static state information through the established out-of-band communication link.

Here, the static state information of the wireless power receiver 20 may include category information, hardware and software version information, maximum rectifier output power information, initial reference parameter information for power control, information on a required voltage or power, and whether a power regulation function is installed. It may include at least one of information for identifying the information, information on the supportable out-of-band communication scheme, information on the supportable power control algorithm, preferred voltage value of the rectifier stage initially set in the wireless power receiver.

When the static state information of the wireless power receiver 20 is received, the wireless power transmitter 10 may transmit the static state information of the wireless power transmitter 10 to the wireless power receiver through an out-of-band communication link.

Here, the static state information of the wireless power transmitter 10 may include transmitter power information, class information, hardware and software version information, information on the maximum number of supportable wireless power receivers, and / or information about the number of wireless power receivers currently connected. It may be configured to include at least one of the information.

Thereafter, the wireless power receiver 20 monitors its real-time power reception state and charging state, and may transmit dynamic state information to the wireless power transmitter 10 when a periodic or specific event occurs.

Here, the dynamic state information of the wireless power receiver 20 includes information on the rectifier output voltage and current, information on the voltage and current applied to the load, information on the internal measurement temperature of the wireless power receiver (overheating information), power control It may be configured to include at least one of reference parameter change information (rectified voltage minimum value, rectified voltage maximum value, initially set preferred rectifier terminal voltage change value), charging status information, system error information, alarm information for. The wireless power transmitter 10 may perform power adjustment by changing a setting value included in the existing static state information when receiving the reference parameter change information for power control.

In addition, when sufficient power for charging the wireless power receiver 20 is ready, the wireless power transmitter 10 may transmit a predetermined control command through the out-of-band communication link to control the wireless power receiver 20 to start charging. Can be.

Thereafter, the wireless power transmitter 10 may dynamically control the transmission power by receiving the dynamic state information from the wireless power receiver 20.

In addition, when an internal system error is detected or the charging is completed, the wireless power receiver may transmit the dynamic state information to the wireless power transmitter including data for identifying the system error and / or data indicating that the charging is completed ( S617). Here, the system error may include an overcurrent, an overvoltage, an overheating state, and the like.

For example, when the system error state is changed due to overheating, the wireless power receiver 20 may transmit a predetermined message indicating the occurrence of overheating to the wireless power transmitter 10. In this case, the wireless power receiver may reduce the heat generated internally by driving the provided cooling fan. On the contrary, the wireless power transmitter 10 may also monitor the occurrence of overheating of the internal temperature and transmit it to the wireless power receiver 20, and may perform an operation for resolving the overheating state.

The in-band communication and the out-of-band communication may provide bidirectional communication, but are not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may provide one-way communication or half-duplex communication.

For example, unidirectional communication may be the wireless power receiver 20 to transmit information only to the wireless power transmitter 10, but is not limited thereto. The wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.

In the half-duplex communication method, bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.

The wireless power receiver 20 according to an embodiment of the present invention may obtain various state information of the electronic device 30. For example, the state 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 the like. The information may be obtained from the electronic device 30 and may be utilized for wireless power control.

In particular, the wireless power transmitter 10 according to an embodiment of the present invention may transmit a predetermined packet indicating whether to support fast charging to the wireless power receiver 20. The wireless power receiver 20 may notify the electronic device 30 when it is determined that the connected wireless power transmitter 10 supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through predetermined display means provided, for example, it may be a liquid crystal display.

In addition, the user of the electronic device 30 may control the wireless power transmitter 10 to operate in the fast charge mode by selecting a predetermined fast charge request button displayed on the liquid crystal display means. In this case, when the quick charge request button is selected by the user, the electronic device 30 may transmit a predetermined fast charge request signal to the wireless power receiver 20. The wireless power receiver 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the charging mode packet to the wireless power transmitter 10 to convert the normal low power charging mode into the fast charging mode.

For example, as illustrated by reference numeral 200a, the wireless power receiver 20 may be configured with a plurality of wireless power receivers, and a plurality of wireless power receivers are connected to one wireless power transmitter 10 so that the wireless Charging may also be performed. In this case, the wireless power transmitter 10 may distribute and transmit power to a plurality of wireless power receivers in a time division manner, but is not limited thereto. As another example, the wireless power transmitter 10 may be configured for each wireless power receiver. By using different allocated frequency bands, power may be distributed and transmitted to a plurality of wireless power receivers.

In this case, the number of wireless power receivers that can be connected to one wireless power transmitter 10 may include at least one of a required power amount for each wireless power receiver, a battery charge state, power consumption of an electronic device, and available power amount of the wireless power transmitter. Can be adaptively determined based on the

As another example, as illustrated in FIG. 200B, the wireless power transmitter 10 may be configured with a plurality of wireless power transmitters. In this case, the wireless power receiver 20 may be simultaneously connected to a plurality of wireless power transmitters, and may simultaneously receive power from the connected wireless power transmitters and perform charging. In this case, the number of wireless power transmitters connected to the wireless power receiver 20 may be adaptively based on the required power amount of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, the available power amount of the wireless power transmitter, and the like. Can be determined.

Meanwhile, a plurality of wireless power antennas may be disposed in one wireless power transmitter 10. When a plurality of wireless power antennas are arranged in the wireless power transmitter, the amount of power delivered to the wireless power receiver 20 in the area where the wireless power antenna is arranged is preferably uniform in any of the areas where power transmission is performed.

In other words, the wireless power receiver 20 preferably receives the same amount of power in a region where power can be received. For this purpose, each of the plurality of wireless power antennas included in the wireless power transmitter 10 requires the same electrical characteristics.

Referring to FIG. 3, the wireless power transmitter 300 includes a wireless power antenna coil 310 mounted with a wireless power antenna assembly, a wireless power antenna assembly 320 including a plurality of wireless power antennas, and wireless power. A shielding material 330 for absorbing or reflecting electromagnetic waves generated from the antenna assembly 320, a metal substrate 340 covering the shielding material 330, and input / output terminals for electrical signals generated from each of the plurality of wireless power antennas. The terminal plate 350 may be included. The components shown in FIG. 3 are not essential, such that a wireless power transmitter 300 with more or fewer components may be implemented.

Wireless power antenna assembly 320 is a collection of a plurality of wireless power antenna, the present invention is not limited to the number of wireless power antenna included in the wireless power antenna assembly 320, embodiments of the present invention is a plurality of wireless power The arrangement of the antenna is not limited. The arrangement of the plurality of wireless power antennas will be described together in FIGS. 4A to 8D below.

The wireless power transmitter 300 may arrange the shielding material 330 adjacent to the wireless power antenna assembly 320 to block or reflect the electromagnetic wave generated from the wireless power antenna assembly 320. The wireless power signal generated from the wireless power antenna assembly 320 may act as electromagnetic interference (EMI) to other circuit devices therein.

The shield 330 may block the influence of the current or voltage of the circuit device by blocking electromagnetic waves generated from the wireless power antenna assembly 320 from reaching the circuit device mounted to the wireless power transmitter.

The shield 330 may be a planar shield, and the planar shield is easy to be disposed adjacent to the wireless power antenna assembly 320 that generates heat as a flat plate shield.

The terminal plate 350 may include a plurality of input / output terminals. The terminal board 350 may be a printed circuit board (PCB) or a board including electrical wiring for connecting circuit components included in the wireless power transmitter 300. The terminal plate 350 may be mechanically fixed through pins while electrically connecting circuit components.

4A to 4C are diagrams for describing a wireless power antenna assembly including three wireless power antennas according to an embodiment of the present invention. 4A is a perspective view of the wireless power antenna assembly, FIG. 4B is a surface view by the orthographic projection method of the wireless power antenna assembly, and FIG. 4C is a front view of the wireless power antenna assembly.

4A-4C, the wireless power antenna assemblies 400, 400a-400c may include a first wireless power antenna 410, a second wireless power antenna 420, and a third wireless power antenna 430. Can be. However, the number of wireless power antennas included in the wireless power antenna assembly 400 of the present invention is not limited to the number shown in the drawings, and the arrangement of the wireless power antennas is not limited to the arrangement shown in the drawings.

The first wireless power antenna 410, the second wireless power antenna 420, and the third, depending on which region of the wireless power transmitter (see FIG. 1, 20) is located in the wireless power transmitter (see FIG. 1, 10). At least one of the wireless power antennas 430 may be activated. The wireless power transmitter 10 may include a capacitive sensing sensor (not shown) capable of sensing whether the wireless power receiver 20 is located on the wireless power transmitter 10, and thus sensing It is possible to selectively activate the wireless power antenna disposed in the area.

The first wireless power antenna 410, the second wireless power antenna 420, and the third wireless power antenna 430 may be disposed on the shielding material 440 by overlapping each other in some areas.

The second wireless power antenna 420 and the third wireless power antenna 430 of the plurality of overlapping wireless power antennas may be disposed below, and the first wireless power antenna 410 may be a second wireless power antenna ( 420 and the third wireless power antenna 430 may be disposed on the upper layer to include an area overlapping with each other.

The second wireless power antenna 420 and the third wireless power antenna 430 disposed on the lower layer may be symmetrically disposed with respect to the central axis 415 crossing the first wireless power antenna 420.

In addition, the second wireless power antenna 420 and the third wireless power antenna 430 may be spaced apart from each other by a distance 425.

The step generated by such a multi-layer arrangement may affect the electrical characteristics between the plurality of wireless power antennas in relation to the shield 440. For example, a difference may occur between the inductance measured on the first wireless power antenna 410 and the inductance of the second wireless power antenna 420 or the third wireless power antenna 430. This may be due to a difference in absorption or reflection of electromagnetic waves by the shielding material 440 since the first wireless power antenna 410 is spaced apart from the shielding material 440 by the height of the second wireless power antenna 420. .

In addition, the step generated by the multilayer arrangement may cause difficulty in radiating heat generated from the plurality of wireless power antennas to the outside in relation to the shielding material 440. The second wireless power antenna 420 and the third wireless power antenna 430 may be disposed to directly contact the surface of the shielding material 440 to facilitate heat transfer generated from each wireless power antenna. On the contrary, in the case of the first wireless power antenna 410, as the shielding material 440 is disposed apart by a predetermined height, heat is not directly transferred to the second wireless power antenna 420 or the third wireless power antenna 430. Can be delivered via.

5A to 5D are diagrams for describing a wireless power antenna assembly including a bottom wireless power antenna according to an embodiment of the present invention. 5A is a perspective view of the wireless power antenna assembly, FIG. 5B is a surface view by the orthographic projection method of the wireless power antenna assembly, FIG. 5C is a front view of the wireless power antenna assembly, and FIG. 5D is a side view of the wireless power antenna assembly.

5A-5D, the wireless power antenna assemblies 500, 500a-500d are spaced between the top wireless power antenna 510, the two side

wireless power antennas

520, 530, and the two side wireless power antennas. And a bottom wireless power antenna 540 with a short width (see FIG. 4A, 425). The wireless power antenna assembly 500 may be disposed on the shield 550. The two side

wireless power antennas

520 and 530 which are spaced apart from each other may overlap the upper wireless power antenna 510 in some areas and be disposed at the bottom thereof.

Meanwhile, the upper wireless power antenna 510 and the two side

wireless power antennas

520 and 530 may be manufactured according to the specifications of the coils defined in the WPC or the PMA, and within the range in which the respective physical characteristics are allowed. May be the same.

For example, the wireless power antenna may have a standard as shown in Table 1 below.

Table 1 is a specification for the A13 type transmission coil defined in the WPC, and in one embodiment, the top wireless power antenna 510 and the two side

wireless power antennas

520 and 530 are the outer length and the inner side defined in Table 1. It can be produced in length, outer width, inner width, thickness and number of turns. Preferably, by the same manufacturing process, the upper wireless power antenna 510 and the two side

wireless power antennas

520 and 530 may have the same physical characteristics within an error range.

However, as shown in FIGS. 4A to 4C, each of the upper wireless power antenna 510 and the two side

wireless power antennas

520 and 530 may have different inductances depending on the arrangement position due to the arrangement with the shielding material 550. It can have a value.

For example, the two side

wireless power antennas

520 and 530 satisfy the specification of Table 1 and have an inductance of 12.5 uH, and the upper wireless power antenna 510 has a distance of 2 by the shielding material 550. Unlike the two side

wireless power antennas

520 and 530, the antenna may have an inductance (eg, 11.5 uH) smaller than 12.5 uH.

Preferably, uniform power transmission is preferably performed throughout the charging region in which the plurality of wireless power antennas are arranged. However, due to the difference in inductance, the amount of power transmission may be small in the region where the upper wireless power antenna is located.

Accordingly, the lower wireless power antenna 540 may be disposed below the upper wireless power antenna 510 to compensate for the difference in inductance between the side

wireless power antennas

520 or 530 in the upper wireless power antenna 510. As a result, the inductance of the top wireless power antenna 510 and the inductance of the side

wireless power antenna

520 or 530 may have the same value within the error range by the bottom wireless power antenna 540.

The winding length of the lower wireless power antenna 540 may be determined by the difference between the inductance of the upper wireless power antenna 510 and the inductance of the side

wireless power antenna

520 or 530.

Since the inductance is dependent on the winding length, the winding length of the lower wireless power antenna 540 may be a difference between the winding length of the upper wireless power antenna 510 and the winding length of the side

wireless power antenna

520 or 530.

The bottom wireless power antenna 540 may be located between the two side

wireless power antennas

520, 530, and the short width of the bottom wireless power antenna 540 is between the two side

wireless power antennas

520, 530. It can be included in the separation distance.

In addition, the lower wireless power antenna 540 may transfer heat generated from the upper wireless power antenna 510 to the outside through the shielding material 550. In a situation where the lower wireless power antenna 540 is not disposed, heat generated from the upper wireless power antenna 510 may be transferred to the shielding material 550 through the side

wireless power antennas

520 and 530. The lower wireless power antenna 540 is a medium in which heat generated from the upper wireless power antenna 510 may move directly to the shielding material 550 so that heat generated from the upper wireless power antenna 510 may be transferred to the outside. . As the thermal diffusion structure of the wireless power antenna assembly 500 is changed by the lower wireless power antenna 540, efficiency in heat dissipation may be improved.

Referring to FIG. 6, the wireless power antenna assembly 600 includes a lower wireless power antenna that increases inductance of the upper wireless power antenna 610, the two side

wireless power antennas

620 and 630, and the upper wireless power antenna 610. 640 and filler 660 filling the step 615 by the height of the top wireless power antenna 610.

The filler 660 may be disposed on top of each of the two side

wireless power antennas

620 and 630, and the step difference between the side

wireless power antennas

620 and 630 and the upper wireless power antenna 610 by the filler 660. 615 may be compensated.

The filler 660 may be silicon, and the empty space may be filled with silicon to improve durability of the wireless power antenna assembly 600.

The filler 660 may be filled so that the top surface of the wireless power antenna assembly 600 is flat and bordered at the edges of the two side

wireless power antennas

620 and 630.

7A to 7E are diagrams for describing a wireless power antenna assembly including a plurality of multilayer wireless power antennas according to an embodiment of the present invention. FIG. 7A is a perspective view of the wireless power antenna assembly, FIG. 7B is an exploded view of each layer of the wireless power antenna arranged in multiple layers, FIG. 7C is a surface view by the orthographic projection method of the wireless power antenna assembly, and FIG. Is a front view of the antenna assembly, and FIG. 7E is a side view of the wireless power antenna assembly.

7A-7D, the wireless power antenna assemblies 700, 700a-700e each include a first wireless power antenna 710, a second wireless power antenna 720, and a third wireless, including two layers. It may include a power antenna 730.

The first wireless power antenna 710 may be disposed in the center area of the shielding material 740, and each of the second wireless power antenna 720 and the third wireless power antenna 730 may be connected to the first wireless power antenna 710. It may be arranged symmetrically about the center.

Each of the first wireless power antenna 710, the second wireless power antenna 720, and the third wireless power antenna 730 may include a lower layer wireless power antenna and a higher layer wireless power antenna. The upper layer

wireless power antennas

713, 723, and 733 and the lower layer

wireless power antennas

715, 725, and 735 may be arranged in layers and overlapped with each other (hereinafter, referred to as a "multilayer arrangement"). The wireless power antenna including the lower layer wireless power antenna and the upper layer wireless power antenna may be referred to as a multilayer wireless power antenna.

The winding length of the wireless power antenna may have the greatest influence on the inductance of the wireless power antenna, so that the windings of each of the first wireless power antenna 710, the second wireless power antenna 720, and the third wireless power antenna 730 may be different. The length may be the same, and accordingly, inductances of the first wireless power antenna 710, the second wireless power antenna 720, and the third wireless power antenna 730 may also be the same.

Accordingly, the sum of the winding lengths of the first upper layer wireless power antenna 713 and the first lower layer wireless power antenna 715 is the sum of the winding lengths of the second upper layer wireless power antenna 723 and the second lower layer wireless power antenna 725. May be the same as Similarly, the sum of the winding lengths of the second upper wireless power antenna 723 and the second lower wireless power antenna 725 is equal to the sum of the winding lengths of the third upper wireless power antenna 733 and the third lower wireless power antenna 735. May be the same.

According to an embodiment, the long dow of the second lower layer wireless power antenna 725 may be the same as the long dow of the second upper layer wireless power antenna 723, but the second lower layer wireless power antenna 725 may be the same. ) May be half of the short width (first dol) of the second upper layer wireless power antenna 713.

The multiple duplex wireless power antennas do not generate a step, and thus the wireless power antenna mounting frame on which the wireless power antenna assembly including the multiple duplex wireless power antennas is mounted does not need a separate injection molding having a complicated shape using a mold. You may not. In other words, a flat plate may be sufficient without using a separate mold generated in consideration of the shape of each of the wireless power antennas.

In addition, as the contact area increases with the shielding material disposed around the wireless power antenna assembly and the wireless power antenna mounting frame as the step is not generated, heat generated from the wireless power antenna assembly is directly transferred to the shielding material and the wireless power antenna mounting frame. The heat transfer efficiency to the outside can be increased.

The multilayer wireless power antenna may have a larger inductance than a general wireless power antenna of the same size (a wireless power antenna composed of only one layer), so that the size of the multilayer wireless power antenna itself that meets the inductance required by the WPC or PMA It may be smaller than a typical wireless power antenna.

Therefore, a multi-layered wireless power antenna may be mounted on a wearable device (eg, smart-watch, smart-glasses, etc.) requiring miniaturization.

8A to 8C, the wireless power antenna assemblies 800 and 800a to 800c may include a first wireless power antenna 810 and a second wireless power antenna 820.

Each of the first wireless power antenna 810 and the second wireless power antenna 820 may include a main

wireless power antenna

813 and 823 and a sub

wireless power antenna

815 and 825.

The first main wireless power antenna 813 and the second main wireless power antenna 823 may overlap each other in some areas, and the first main wireless power antenna 813 may be disposed above the overlapping area. The second main wireless power antenna 823 may be disposed below the overlapping area. An empty space may be generated below the first main wireless power antenna 813, and an empty space may be generated above the second main wireless power antenna 823.

Steps generated by the multi-layer arrangement generate empty spaces, which can affect the inductance and heat dissipation of the wireless power antenna.

Referring to FIG. 8B, a first sub wireless power antenna 815 and a second sub wireless power antenna 825 may be disposed in each empty space. In other words, the

sub-wireless power antennas

815 and 825 may fill the step between the first main wireless power antenna 813 and the second wireless power antenna 823.

According to an embodiment, the size specifications of the first main wireless power antenna 813 and the second main wireless power antenna 823 may be the same, and the first sub wireless power antenna 815 and the second sub wireless power antenna ( The size specification of 825 may be the same.

In this case, the long width of the first main wireless power antenna 813 may be the same as the long width of the first sub wireless power antenna 815, but the short width of the first sub wireless power antenna 815 (second dol ) May be half of the short width (first dol) of the first main wireless power antenna 813.

According to an embodiment, the sum of the winding lengths of the first main wireless power antenna 813 and the first sub wireless power antenna 815 may be the windings of the second main wireless power antenna 823 and the second sub wireless power antenna 825. As the sum of lengths, inductances of the first wireless power antenna 810 and the second wireless power antenna 820 may be the same.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention relates to a wireless charging technology, and can be applied to a wireless power transmitter including a plurality of wireless power antennas.

Claims

A wireless power antenna assembly comprising an upper wireless power antenna, two side wireless power antennas, and a lower wireless power antenna;

A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly;

Including;

The two side wireless power antennas spaced apart from each other are disposed at the bottom overlapping with the upper wireless power antenna,

The winding length of the lower wireless power antenna is,

The difference between the inductance of the upper wireless power antenna and the inductance of the side wireless power antenna

Wireless power transmitter.
The method of claim 1,

The winding length of the lower wireless power antenna is

The difference between the winding length of the upper wireless power antenna and the winding length of the side wireless power antenna

Wireless power transmitter.
The method of claim 1,

The lower wireless power antenna is positioned between the two side wireless power antennas spaced apart from each other.

Wireless power transmitter.
The method of claim 1,

A filling material filling a step with the upper wireless power antenna on the side wireless power antenna;

Containing more

Wireless power transmitter.
The method of claim 4, wherein

The filler comprises silicon

Wireless power transmitter.
A wireless power antenna assembly including a plurality of wireless power antennas disposed to overlap each other;

A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly;

Including;

The wireless power antenna assembly,

A plurality of sub-wireless power antennas disposed above or below a second wireless power antenna positioned at a lower portion of the first wireless power antenna;

Containing

Wireless power transmitter.
The method of claim 6,

The sub wireless power antenna,

Filling a step between the first wireless power antenna and the second wireless power antenna;

Wireless power transmitter.
The method of claim 6,

The sum of the winding lengths of the first sub power antenna and the first sub power antenna positioned below the first wireless power antenna and the first wireless power antenna,

The sum of the winding lengths of the second sub power antenna and the second sub power antenna positioned above the second wireless power antenna and the second wireless power antenna.

Wireless power transmitter.
The method of claim 6,

Inductance of the first combination of the first wireless power antenna and the first sub-wireless power antenna positioned below the first wireless power antenna,

Inductance of the second combination of the second wireless power antenna and the second sub-wireless power antenna positioned above the second wireless power antenna

Wireless power transmitter.
A wireless power antenna assembly comprising a first wireless power antenna, a second wireless power antenna, and a third wireless power antenna;

A shielding material for reflecting electromagnetic waves generated from the wireless power antenna assembly;

Including;

Each of the first wireless power antenna, the second wireless power antenna, and the third wireless power antenna is a multilayer wireless power antenna including a lower layer wireless power antenna and an upper layer wireless power antenna.

Wireless power transmitter.