WO2018190510A1

WO2018190510A1 - Wireless power module

Info

Publication number: WO2018190510A1
Application number: PCT/KR2018/002367
Authority: WO
Inventors: 임성현
Original assignee: 엘지이노텍(주)
Priority date: 2017-04-11
Filing date: 2018-02-27
Publication date: 2018-10-18
Also published as: KR20180114721A

Abstract

The present invention relates to a wireless power transmitter comprising a plurality of wireless power antennas. A wireless power module, according to one embodiment of the present invention, comprises: a wireless power antenna assembly comprising at least one wireless power antenna; and a planar shielding material comprising a plurality of holes through which heat generated from the wireless power antenna assembly is emitted, wherein the position at which the plurality of holes are arranged may be determined so as to be on a region where the wireless power antenna is positioned according to the shape of the wireless power antenna or the position at which the wireless power antenna is arranged.

Description

Wireless power module

The present invention relates to a wireless power module including a shield for dissipating heat generated from a wireless power antenna.

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.

Meanwhile, heat may be generated from the wireless power antenna when the wireless power transmitter transmits the wireless power signal to the wireless power receiver. The circuit elements included in the wireless power transmitter may have difficulty in controlling voltage or current if heat is not radiated smoothly, resulting in difficulty in controlling the wireless power transmitter. Can be shortened. In addition, the heat generated by the wireless power transmitter may threaten the safety of the user.

The wireless power antenna may be disposed together with a shielding material that blocks or reflects electromagnetic waves generated from the wireless power antenna, and may radiate heat generated from the wireless power antenna through the shielding material disposed adjacently.

Accordingly, there is a need for a specific method capable of dissipating heat generated from a wireless power antenna through a shield disposed adjacent to the wireless power antenna.

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 module including a heat dissipation shield.

The present invention provides a wireless power module including a shield including a hole for radiating heat generated from the wireless power antenna to the outside.

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, the wireless power module according to the embodiment, the wireless power antenna assembly including at least one wireless power antenna; And a plurality of holes for dissipating heat generated from the wireless power antenna assembly. The position where the plurality of perforations are disposed may be determined to be disposed on an area where the wireless power antenna is located according to the shape of the wireless power antenna or the position where the wireless power antenna is disposed.

According to an embodiment, the sizes of the plurality of perforations may be determined to be disposed on an area where the wireless power antenna is located according to the shape of the wireless power antenna or the position where the wireless power antenna is disposed.

According to an embodiment, the ratio of the total area of the plurality of perforations to the area of the planar shielding material may be determined by the required heat generation to be radiated or the required shielding rate of electromagnetic waves.

According to an embodiment, said wireless power antenna assembly comprises: a central wireless power antenna; And a first wireless power antenna and a second wireless power antenna arranged symmetrically about the central wireless power antenna.

According to an embodiment, the plurality of perforations may be classified into first patterns and second patterns having different sizes and arrangement regions.

In some embodiments, the first pattern may be disposed in a first region in which the central wireless power antenna, the first wireless power antenna, and the second wireless power antenna overlap.

In some embodiments, the second pattern may be disposed in a second area that does not overlap the center wireless power antenna among the areas in which the first wireless power antenna and the second wireless power antenna are disposed.

In some embodiments, at least one perforation included in the second pattern may be disposed on an orthogonal shaft formed based on the center of each of the first wireless power antenna and the second wireless power antenna.

According to an embodiment, the size of the perforation included in the first pattern may be smaller than the size of the perforation included in the second pattern.

According to an embodiment, the perforation included in the first pattern may be circular, and the perforation included in the second pattern may be slit type.

The wireless power module according to the embodiment may be included in a wireless power transmitter.

Wireless power module according to an embodiment, the shielding material comprising a plurality of perforations; And a wireless power antenna assembly disposed on the shielding material, wherein the wireless power antenna assembly includes a first wireless power antenna, a second wireless power antenna, and a third wireless power antenna. The plurality of perforations may be disposed on the first wireless power antenna and the second wireless power antenna, and the plurality of perforations may include first perforations and second perforations, and the first perforations and the second perforations may have different shapes. .

In the wireless power module according to the embodiment, the first puncturing may be disposed in a first region where the third wireless power antenna and the first wireless power antenna or the second wireless power antenna overlap.

In the wireless power module according to the embodiment, the second perforation may be disposed in a second area where the third wireless power antenna and the first wireless power antenna or the second wireless power antenna do not overlap.

In the wireless power module according to the embodiment, the size of the first puncture may be smaller than the size of the second puncture.

In the wireless power module according to the embodiment, the number of the first holes may be smaller than the number of the second holes.

In the wireless power module according to the embodiment, the first puncture and the second puncture are formed in plurality,

The second perforation may be disposed outside the first perforation.

In the wireless power module according to the embodiment, the width of the first puncture or the second puncture may be less than or equal to the width of the first wireless power antenna, the second wireless power antenna or the third wireless power antenna. have.

In the wireless power module according to the embodiment, the first perforation may be circular.

In the wireless power module according to the embodiment, the second perforation may be a slit type.

In the wireless power module according to the embodiment, the sum of the plurality of perforations may be at least 5% of the area of the shielding material.

In the wireless power module according to the embodiment, the sum of the plurality of perforations may be less than 10% of the area of the shielding material.

Wireless power module according to an embodiment, the shielding material comprising a plurality of perforations; And a wireless power antenna assembly disposed on the shielding material, wherein the wireless power antenna assembly includes a first wireless power antenna, a second wireless power antenna, and a third wireless power antenna. The area of the first wireless power antenna and the second wireless power antenna, wherein the sum of the plurality of perforations may be less than 10% of the area of the shielding material.

In the wireless power module according to the embodiment, the plurality of perforations may include a first perforation and a second perforation.

The second perforation may be disposed outside the first perforation.

The above aspects of the present invention are merely 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.

Referring to the effect on the wireless power transmitter including a heat shield shield according to an embodiment as follows.

First, one embodiment can overcome the difficult properties of thermal diffusion of the shielding material in a mechanical form through a perforation.

Second, one embodiment can ensure the operation safety of the wireless power transmitter by heat dissipation through the puncture while maintaining the shielding efficiency of the shielding material in an appropriate state, and can prevent the problem that the internal circuit device is burned out by heat, and as a result the circuit The life of the device can be extended.

Third, in one embodiment, the perforation may be arranged in a region in which a relatively high amount of heat is generated in the wireless power antenna.

Fourth, an embodiment may improve power transmission efficiency through thermal management of a wireless power transmitter.

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 view for explaining a wireless power transmitter including a heat shield shield according to an embodiment of the present invention.

4A to 4B are views for explaining a heat dissipation shield including perforations according to an embodiment.

5A to 5B are diagrams for describing a heat dissipation shield including perforations positioned on a wireless power antenna, according to an exemplary embodiment.

6 is a diagram for describing a surface temperature of a wireless power transmitter including a heat dissipation shield according to an embodiment.

7 is a view for explaining the ratio of the total area of the perforations included in the shielding material according to an embodiment.

A wireless power module according to an embodiment of the present invention, a wireless power antenna assembly including at least one wireless power antenna; And a plurality of holes for dissipating heat generated from the wireless power antenna assembly. The position where the plurality of perforations are disposed may be determined to be disposed on an area where the wireless power antenna is located according to the shape of the wireless power antenna or the position where the wireless power antenna is disposed.

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 transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 30 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. In 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. Here, the status information and control information exchanged between the transceivers will be 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 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.

Recently, the wireless charging system can be used not only in buildings such as homes or office spaces, but also mounted in vehicles. A wireless charging system mounted inside the vehicle can be used to charge a passenger's portable device, including the driver.

On the other hand, the wireless power transmitter mounted on the vehicle may be equipped with an antenna capable of performing short-range wireless communication. In one embodiment, the short range wireless communication may be Near Field Communication (NFC) communication, but may include other Bluetooth communication, beacon communication, Zigbee communication, Wi-Fi communication, and the like.

The wireless power transmitter mounted in a vehicle may perform various functions by performing short range wireless communication with a user's portable device. According to an embodiment, a wireless power transmitter mounted on a vehicle may perform a financial settlement service (eg, a high-pass service or a fueling settlement service) that occurs while driving a vehicle through short-range wireless communication with a portable device. Can be. In addition, the remote start service of the vehicle may be used through short-range wireless communication with the portable device, and as a driver of the vehicle, it may be determined whether the vehicle has the access right to the driving. In addition, the location information of the vehicle may be transmitted to the portable device through the wireless power transmitter to allow the user to confirm the location of the vehicle.

In one embodiment, the wireless power transmitter may transmit a payment request signal to the portable device via short-range wireless communication, and the portable device may transmit a response signal thereto. In one embodiment, the portable device may transmit a remote start signal to the wireless power transmitter via near field communication. In one embodiment, the wireless power transmitter may transmit a signal including the location information of the vehicle to the portable device. In addition, in one embodiment, the wireless power transmitter may transmit control signals of various operations using short-range wireless communication.

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. 5A and 5B 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.

A hole (not shown) for transferring heat generated from the wireless power antenna assembly 320 included in the shield 330 to the outside may affect shielding efficiency of the shield. The heat generated from the wireless power antenna assembly 320 may be directly transferred to the outside through the metal substrate 340 having a relatively high thermal conductivity through the perforation. The shield 330 may be a planar shield and the planar shield is The flat plate shield is easy to place adjacent to the wireless power antenna assembly 320 where heat is generated.

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 4B are views for explaining a heat dissipation shield including perforations according to an embodiment. In detail, FIGS. 4A to 4B are diagrams for explaining perforations included in a shielding material according to a wireless power antenna according to an embodiment.

In the present invention, the wireless power antennas 401 to 403 are not limited to the wireless power transmission method. In other words, the wireless power antenna may receive power by at least one of an electromagnetic induction method, an electromagnetic resonance method, an RF wireless power transmission method, or another wireless power transmission method.

In addition, in the present invention, the wireless power antenna is not limited to various wireless power transmission standards that are applied by the same wireless power transmission scheme. In other words, a wireless power antenna that receives power according to an electromagnetic induction scheme may receive power by at least one of a Wireless Power Consortium (WPC) and / or a Power Matters Alliance (PMA). In addition, the wireless power antenna that receives power according to the electromagnetic resonance method may receive power in a resonance method defined by an AFA (Airfuel Alliane) standard mechanism.

The wireless power antennas 401 to 403 may be disposed adjacent to each other. The wireless power antennas 401 to 403 may be arranged not to overlap on the same plane, but may be disposed on another plane. When the wireless power antennas 401 to 403 are disposed on different planes, overlapping areas may occur when the wireless power antenna assembly is viewed from above.

According to an embodiment, the wireless power antenna assembly is disposed on the lower layer of the first wireless power antenna 401 and the first wireless power antenna 401 in an area located at the center (eg, center of gravity) of the shield 400. The second wireless power antenna 402 and the third wireless power antenna 403 may be included.

According to an embodiment, the second wireless power antenna 402 and the third wireless power antenna 403, which may be disposed below the first wireless power tena 401, may be spaced apart from each other. The second wireless power antenna 402 and the third wireless power antenna 403 may be symmetrically disposed about the first wireless power antenna 401. In this case, the first wireless power antenna 401 may be disposed to have an area overlapping with the second wireless power antenna 402 and the third wireless power antenna 403, respectively.

The first wireless power antenna 401, the second wireless power antenna 402, and the third, depending on which region of the wireless power receiver (see FIG. 1, 20) is located in the wireless power transmitter (see FIG. 1, 10). At least one of the wireless power antennas 403 may be activated. The wireless power transmitter 10 may include a capacitive sensing sensor (not shown) capable of detecting whether the wireless power receiver 20 is positioned on the wireless power transmitter 10, and thus detected. The wireless power antenna disposed in the area may be selectively activated.

There may be a plurality of perforations 410 included in the shielding material 410, and the size (diameter) and the regular arrangement pattern of the perforations 410 may be determined according to the required shielding rate or required heating value.

In addition, the size (diameter) and the regular arrangement pattern of the perforation 410 may be determined in consideration of maintaining the shape of the shielding material 400 itself. For example, when the perforation 410 is excessively large or the total area of the perforations 410 is excessively large, the shielding material may be broken or bent due to the external force of the shielding material 400. 400 should be able to maintain shape.

The perforations 410 included in the shielding material 400a have the same size, and each of the plurality of perforations 410 may be disposed to have a predetermined separation distance.

The

perforations

410 and 420 included in the shielding material 400b may be classified according to size, and each of the

perforations

410 and 420 classified according to the size may have a different pattern.

In the case of the shielding material 400b, a perforation 420 having a relatively small size may be disposed in an inner region where the wireless power antennas 401 to 403 are not mainly located, and an outer portion where the wireless power antennas 401 to 403 are located. Perforations 410 having a relatively large size may be disposed in the side region. Since a large amount of heat is generated in the outer region where the wireless power antennas 401 to 403 are located, a large sized perforation 420 may be disposed to discharge heat out of the shielding material 400b.

However, when the total area of the

perforations

410 and 420 is excessively large (when the predetermined area is exceeded) as shown in FIGS. 4A to 4B, the shielding effect of the shielding member 400 may be reduced.

If the wireless power transmission efficiency is lowered by reducing the shielding rate of the shielding material 400, more current or voltage may be applied to the wireless power antennas 401 to 403, and consequently more to the wireless power antennas 401 to 403. Problems that can generate a lot of heat can occur.

5A and 5B, the position and size of the plurality of perforations are located according to the shape of the wireless power antennas 501 to 502 or the position where the wireless power antennas 501 to 502 are disposed. It can be determined to be placed on the area.

The perforations may have a first perforation 510 and a second perforation 520 according to the amount of heat generated by the wireless power antennas 501 to 502. According to an embodiment, the plurality of perforations may be classified into first perforations 510 and second perforations 520 that differ in shape, size, and placement area.

The first perforation 510 may be disposed in a first region where the first wireless power antenna 501, the second wireless power antenna 502, and the third wireless power antenna 503 overlap each other.

The second perforation 520 may be disposed in a second area not overlapping with the first wireless power antenna 501 among the areas in which the second wireless power antenna 502 and the second wireless power antenna 503 are disposed.

At least one perforation included in the second perforation 520 may be disposed on an orthogonal shaft 530 formed based on the center of each of the second wireless power antenna 502 and the third wireless power antenna 503. .

Since the first wireless power antenna 501, the second wireless power antenna 502, and the third wireless power antenna 503 may each generate a larger amount of heat in a non-overlapping second area than in the overlapping first area, The size of the perforation included in the first perforation 510 may be smaller than the size of the perforation included in the second perforation 520.

According to an embodiment, the perforation included in the first perforation 510 may be circular, and the perforation included in the second perforation 520 may be a slit type.

The first puncture 510 disposed in an area where the first wireless power antenna 501, the second wireless power antenna 502, and the third wireless power antenna 503 overlap each other may be circular in consideration of the direction of electromagnetic waves. The second hole 520 disposed in the non-overlapping area may have a slit shape having a vertical direction in the coil winding direction of the wireless power antenna.

The first perforation 510 or the second perforation 520 may be formed in conjunction with the arrangement state of the wireless power antenna to maximize the heat radiation effect and durability of the shielding material. Therefore, the first perforation 510 may be different from another adjacent first perforations 510. For example, the distance between the first perforation 510 and another first perforation 510 adjacent to the horizontal direction and the other first perforation 510 adjacent to the vertical direction may be different. In addition, the distance between the second perforation 520 and the other second perforation 520 adjacent in the horizontal direction, the other second perforation 520 adjacent in the vertical direction, and the distance from the other second perforation 520 adjacent in the diagonal direction are different. Can be.

The first puncture 510 or the second puncture 520 may be formed in conjunction with the arrangement state of the wireless power antenna to maximize the heat dissipation effect and durability. Therefore, the second perforation 520 may be disposed outside the area where the first perforation 510 is disposed. For example, the first perforation 510 may be disposed inside an imaginary line connecting the second perforation 520.

When the first wireless power antenna 501 operates, the first wireless power antenna 501 does not directly contact the shielding material. In addition, heat generated from the first wireless power antenna 501 is transferred to the second wireless power antenna 502 or the third wireless power antenna 503. Therefore, the first perforation 510 may be disposed in an area where the first wireless power antenna 503 and the second wireless power antenna overlap or an area where the first wireless power antenna 503 and the third wireless power antenna overlap. It can radiate heat. At this time, the width of the first perforation 510 is equal to or smaller than the width of the wireless power antenna (length or width minus the inner diameter of the inner hole from the total outer diameter), thereby maximizing heat dissipation effect and durability.

When the second wireless power antenna 502 or the third wireless power antenna 503 is operated, the second wireless power antenna 502 or the third wireless power antenna 503 is in direct contact with the shielding material. Therefore, in order to increase the heat dissipation effect, the size of the second perforation 520 may be larger than that of the first perforation 510 to efficiently dissipate heat. In addition, the size of the first perforation 510 may be smaller than the size of the second perforation 520 to adjust the area ratio of the total perforation to the total shielding area to maintain durability and inductance while maximizing the heat dissipation effect. At this time, the width of the second perforation 520 is formed equal to or smaller than the width of the wireless power antenna (length or width minus the inner diameter of the inner hole from the total outer diameter), it is possible to maximize the heat dissipation effect and durability.

The shielding material may include a perforation (not shown) for assembly, a perforation (not shown) for temperature measurement, in addition to a perforation for heat dissipation. However, since the drilling for the assembly and the drilling for the temperature measurement is disposed in the area where the wireless power antenna is not disposed, the heat dissipation effect is insignificant, and thus the purpose, configuration, and effect of the drilling for dissipation are completely different.

The shield 500b may include a first perforation 510 and a second perforation 520 that include more perforations than the shield 500a.

Referring to FIG. 6, the surface temperatures of each of the wireless power transmitter 610 equipped with a shield including no perforation and the wireless power transmitter 620 equipped with a shield including perforation may be used.

As the power transfer is performed, the surface temperature of the wireless power transmitter rises to a certain temperature, and the surface temperature of the wireless power transmitter with the shielding material having a perforation is approximately higher than that of the wireless power transmitter with the shielding material without the perforation. 3 to 5 low.

Since heat generated from the wireless power antenna does not stay inside and continuously radiates to the outside through the perforations, the surface temperature of the wireless power transmitter may be lower when the perforations are included than when the perforations are included.

Referring to FIG. 7, the shielding rate and the heat generation rate according to the ratio of the total area of the perforations to the area of the shielding material may be in a trade-off relationship. As the combined area ratio of the perforations increases, the shielding rate may decrease, and the exothermic rate radiated through the perforations may increase.

If the ratio of the total area of the perforations is increased in order to radiate more heat generated by the wireless power antenna to the outside, the perforation may lower the shielding rate, which is a function of the shielding material, and the lower the shielding rate, the lower the inductance value of the wireless power antenna. This lowers the wireless power transmission efficiency can be reduced. If the power transfer efficiency is low, more current or voltage may be applied to the wireless power antenna, and a greater amount of heat may be generated in the wireless power antenna by a large current or voltage.

Thus, the shielding material may have a required shielding range 715 at an appropriate level, and the total area of perforation may have a required calorific value range 725. Accordingly, the ratio of the total area of the perforations to the total area of the shielding material may be determined in the overlapping range 730 of the shielding rate range 715 and the calorific value range 725.

The ratio of the total area of the perforations to the area of the shielding material may be less than 10%. According to the embodiment, the ratio of the total area of the perforations to the area of the shielding material is 5.4%. Problems with shape retention may occur. If there is a problem in maintaining the shape of the shield, the cost of materials increases due to the need for additional equipment.

In other words, the higher the ratio of the total area of perforation to the area of the shielding material, the lower the strength of maintaining the shape of the shielding material itself.

The ratio of the total area of the perforations to the area of the shielding material may be 5% or more. The area ratio of the perforation to the area of the shielding material according to the embodiment is 5.4%. If the ratio of the total area of the perforations to the area of the shielding material is less than 5%, an adequate heat dissipation effect cannot be obtained.

The ratio of the total area of the perforations to the area of the shielding material may be determined so as to maintain the rigidity so that the shielding material itself is not bent or broken by external force.

Here, the area of the shielding material may be an area excluding a hole for assembly, a hole for temperature measurement.

In accordance with another aspect of the present invention, a wireless power module includes: a wireless power antenna assembly including at least one wireless power antenna; And a plurality of holes for dissipating heat generated from the wireless power antenna assembly. The position where the plurality of perforations are disposed may be determined to be disposed on an area where the wireless power antenna is located according to the shape of the wireless power antenna or the position where the wireless power antenna is disposed.

The second perforation may be disposed outside the first perforation.

In the wireless power module according to the embodiment, the width of the first puncture or the second puncture may be smaller than the width of the first wireless power antenna, the second wireless power antenna or the third wireless power antenna.

The second perforation may be disposed outside the first perforation.

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 shield.

Claims

A shield comprising a plurality of perforations; And

A wireless power antenna assembly disposed on the shield;

The wireless power antenna assembly comprises a first wireless power antenna, a second wireless power antenna and a third wireless power antenna,

The third wireless power antenna is disposed on the first wireless power antenna and the second wireless power antenna,

The plurality of perforations comprises a first perforation and a second perforation,

The first and second perforations have different shapes

Wireless power module.
According to claim 1,

The first perforation,

The third wireless power antenna and the first wireless power antenna or the second wireless power antenna disposed in a first region overlapping

Wireless power module.
According to claim 1,

The second perforation,

The third wireless power antenna and the first wireless power antenna or the second wireless power antenna is disposed in a second area that does not overlap

Wireless power module.
According to claim 1,

The size of the first perforation is less than the size of the second perforation,

The number of first perforations is less than the number of second perforations

Wireless power module.
According to claim 1,

The first perforation and the second perforation are formed in plural,

The second perforation is disposed outside the first perforation

Wireless power module.
According to claim 1,

The width of the first or second puncture,

Less than or equal to the width of the first wireless power antenna, the second wireless power antenna, or the third wireless power antenna

Wireless power module.
According to claim 1,

The first perforation is circular

Wireless power module.
According to claim 1,

The second perforation is slit type

Wireless power module.
According to claim 1,

The sum of the plurality of perforations is 5% or more relative to the area of the shielding material.

Wireless power module.
According to claim 1,

The sum of the plurality of perforations is less than 10% of the area of the shielding material.

Wireless power module.