WO2018169206A1 - Wireless charging device - Google Patents

Abstract

The present invention relates to a wireless charging device. A wireless charging device, according to one embodiment of the present invention, comprises: a coil assembly; a first substrate disposed on the coil assembly; an electromagnetic interference (EMI) filter disposed on a first surface of the first substrate; and a wireless communications antenna disposed on a second surface of the first substrate, wherein the coil assembly includes a plurality of coils, and the EMI filter can include a plurality of different pattern regions corresponding to the plurality of coils. Therefore, the wireless charging device having the EMI filter can be provided.

Description

Wireless charging device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charging technology, and more particularly, to a wireless charging device having an EMI filter and capable of blocking unnecessary electromagnetic waves generated during wireless charging.

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.

Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as radio waves, lasers, high frequencies, and microwaves. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.

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.

To date, energy transmission using wireless may be classified into magnetic induction, electromagnetic resonance, and RF transmission using short wavelength radio frequency.

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.

The magnetic induction method uses the phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows to one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Magnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).

The magnetic resonance method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Since the magnetic resonance method is hardly affected by the electromagnetic wave problem, it has the advantage of being safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.

The short wavelength wireless power transmission scheme—simply, the RF transmission scheme— takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWave. This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power. In other words, the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.

Wireless power transfer technology can be widely used not only in mobile but also in the automobile, IT, railroad and consumer electronics industries.

Devices using electromagnetic fields, such as wireless charging, are restricted from emitting electromagnetic waves of a predetermined size or more under the regulation of Electro Magnetic Interference (EMI).

Meanwhile, Korean Patent Application No. 10-2013-7033209 (a receiver for receiving wireless power and a method for receiving wireless power thereof) is provided separately from a coil for receiving power energy and an outer side of the coil to provide near field communication (Near Field Communication, A receiver for a wireless charging system has been disclosed that includes a coil.

The wireless power transmitter may include both a wireless power transmission antenna and a short range wireless communication antenna, and signals transmitted and received by each antenna may act as electromagnetic interference (EMI). In general, wireless power signals that include relatively higher power may affect as a barrier to near field communication.

Accordingly, there is a need for a method capable of alleviating the effects of a communication failure that a short range wireless communication antenna may receive by a wireless power signal.

The wireless power transmitter generates an AC power signal having a specific operating frequency and wirelessly transmits the generated AC power signal through a transmission coil.

In this case, the wireless power transmitter may generate harmonic signals of other bands as well as signals of a desired operating frequency band.

These harmonic signals have a problem that affects the operation of other electronic devices around the wireless power transmitter.

As an example, a wireless power transmitter may be mounted in a vehicle. In this case, the harmonic component generated by the wireless power transmitter may act as an interference component for vehicle radio wave reception.

Therefore, it is very important to block unnecessary frequency components except the operating frequency band used for wireless charging.

The present invention has been devised to solve the above-described problems of the prior art, and an object of the present invention is to provide a wireless power transmitter equipped with an Electro Magnetic Interference (EMI) filter.

Another object of the present invention is to provide a wireless power transmitter having an EMI filter that is integrated with a NFC (Near Field Communication) antenna on one substrate to block unnecessary electromagnetic fields.

It is still another object of the present invention to provide a wireless power transmitter including a near field communication antenna.

The present invention provides a wireless power transmitter using an electromagnetic interference filter capable of blocking a harmonic signal of a wireless power signal that may affect a short range wireless communication antenna.

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.

The present invention can provide a wireless power transmitter equipped with an electromagnetic interference filter.

A wireless power transmitter according to an embodiment of the present invention is disposed between a charging bed and a transmitting coil assembly and the charging bed and the transmitting coil assembly, and includes an antenna substrate and a transmitting coil assembly including a near field communication antenna and an electromagnetic interference filter. And a control circuit board connected to the antenna substrate to control short range wireless communication and wireless charging.

Here, the electromagnetic interference filter may be disposed on a first surface of the antenna substrate and the short range wireless communication antenna may be disposed on a second surface of the antenna substrate.

In addition, the electromagnetic interference filter may be disposed inside the short range wireless communication antenna so as not to overlap the short range wireless communication antenna.

In addition, the transmitting coil assembly may include a plurality of transmitting coils having a step, and the shape of the electromagnetic interference filter may be determined based on the step.

In addition, the electromagnetic interference filter may include a first lead connected to a ground terminal and a plurality of pattern filters branched from the first lead, and the slit direction of the pattern filter may be different according to the step difference.

Here, the slit direction of the pattern filter may be perpendicular to each other according to the step difference.

In addition, the plurality of transmission coils and the short range wireless communication antenna may be disposed not to overlap each other.

The short range wireless communication antenna may be a near field communication (NFC) antenna.

Here, the NFC antenna has a loop shape, and one end and the other end of the loop may be connected to the negative signal terminal and the positive signal terminal disposed on the first surface through first through second through holes provided in the antenna substrate, respectively. have.

In addition, the loop may have a plurality of turns, and in some sections of the loop, the plurality of turns may cross each other through the first surface.

In addition, a terminal branched from one side of the outermost turn of the loop may be connected to a ground terminal disposed on the first surface through a third through hole provided in the antenna substrate.

In addition, the first surface may face the charging bed, and the second surface may face the transmitting coil assembly.

In addition, the electromagnetic interference filter may block a signal in a frequency band exceeding an operating frequency band for wireless charging.

Another embodiment of the present invention may provide a wireless charging device.

In an embodiment, a wireless charging device includes a coil assembly, a first substrate disposed on the coil assembly, and an electromagnetic interference filter disposed on a first surface of the first substrate; And a wireless communication antenna disposed on a second surface of the first substrate, wherein the coil assembly includes a plurality of coils, and the electromagnetic interference filter includes a plurality of different pattern regions corresponding to the plurality of coils. It may include.

In an embodiment, the coil assembly may include a first coil, a second coil, and a third coil, wherein the first coil and the second coil are disposed on a second substrate, and the third coil is the first coil. The plurality of different pattern regions disposed on the coil and the second coil, and the plurality of different pattern regions include a first pattern region corresponding to the first coil or the second coil and a second pattern region corresponding to the third coil. can do.

The electromagnetic interference filter according to the embodiment may include a first conductive line disposed in a loop shape on the second surface.

In an embodiment, the first pattern region may be connected through a first connection structure positioned at both side regions of the first conductive line, and the second pattern region may be connected through a second connection structure positioned in a center region of the first conductive line. Can be.

The first connection structure according to the embodiment may be a plurality.

In an embodiment, the first pattern region may include a second connection lead connected to the first connection structure, and the second pattern region may include a third connection lead connected to the second connection structure. The conductive wire may be smaller in width than the first conductive wire or the second conductive wire.

In an embodiment, the first pattern region may include a first slit structure disposed in a first direction in the second connection conductor, and the second pattern region may be arranged in a second direction in the third connection conductor. It may include a slit structure.

According to an embodiment, the first direction and the second direction may be different from each other.

The first direction and the second direction according to the embodiment may be perpendicular to each other.

In an embodiment, the first pattern region may be spaced apart from the first coil or the second coil, and the second pattern region may be disposed in contact with the third coil.

In some embodiments, the first pattern region and the second pattern region may have different inductance values.

The first pattern area may be smaller than an area in which the first coil or the second coil is disposed.

The second pattern area may be larger than an area in which the third coil is disposed.

In an exemplary embodiment, an area of the first pattern region and the second pattern region may be different from each other.

The first pattern region and the second pattern region according to the embodiment may have different shapes.

The second pattern region may be disposed between the first pattern regions.

In an embodiment, a spacer may be disposed between the first pattern region and the second pattern region.

In an embodiment, a spacer may be disposed between the first pattern region and the second pattern region.

The second connection lead may have a straight shape, and the third connection lead may have a curved shape.

According to an embodiment, the first slit structure may include a plurality of spaced apart conductive wires, and the plurality of spaced apart conductive wires may have different lengths.

According to an embodiment, the second slit structure may include a plurality of spaced apart conductive wires, and the plurality of spaced apart conductive wires may have different lengths.

According to an embodiment, the width of the first connection structure may be smaller than the width of the second connection structure.

In accordance with another aspect of the present invention, a wireless power transmitter includes: a wireless power transmission antenna for transmitting a wireless power signal in a first operating frequency band; A near field communication antenna for transmitting and receiving a near field communication signal in a second operating frequency band; And an electromagnetic interference filter for blocking harmonic signals of the first operating frequency band. The electromagnetic interference filter may include: a first filter configured to pass a signal above a first cutoff frequency; And a second filter passing the signal below the second cutoff frequency. It may include.

According to an embodiment, the first filter may include a first antenna having a first pattern, and the second filter may include a second antenna having a second pattern.

According to an embodiment, the first antenna may have a first length determined based on the first cutoff frequency, and the second antenna may have a second length determined based on the second cutoff frequency.

In some embodiments, the slit of the first pattern and the slit direction of the second pattern may be orthogonal to each other.

According to an embodiment, the first antenna and the second antenna may not be overlapped and stacked on different layers.

In some embodiments, the wireless power transmission antenna and the short range wireless communication antenna may be spaced apart on the same plane.

In some embodiments, the first antenna and the second antenna may be spaced apart on the same plane as the short range wireless communication antenna.

According to an embodiment, the first antenna is located outside the short range communication antenna and is arranged to surround the short range communication antenna, and the second antenna is located inside the short range communication antenna and surrounded by the short range communication antenna. Can be.

According to an embodiment, the wireless power transmission antenna may be disposed overlapping at a different layer from at least one of the first antenna and the second antenna.

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.

The effects on the method and apparatus according to the present invention are described as follows.

The present invention has the advantage of providing a wireless charging device equipped with an Electromagnetic Interference (EMI) filter.

In addition, the present invention integrates and implements an EMI filter on a substrate on which a Near Field Communication (NFC) antenna is disposed, thereby providing a wireless power transmitter having an EMI filter capable of increasing process efficiency and reducing material costs.

In addition, the present invention has the advantage that the product thickness can be minimized by disposing the EMI filter and the NFC (Near Field Communication) antenna on each side of one substrate.

In addition, according to the present invention, by performing a short range wireless communication in a wireless power transmitter, a user can secure a payment means using short range wireless communication.

In addition, when the wireless power transmitter including the short range wireless communication antenna is mounted in the vehicle, the present invention may be used in various ways such as starting the vehicle, checking the position of the vehicle, or checking user authentication through the short range wireless communication.

The effects obtainable in the present invention are not limited to the above-mentioned effects, 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 an electromagnetic interference problem generated during wireless charging in a vehicle.

4 is an exploded perspective view of a wireless power transmitter according to an embodiment of the present invention.

5 is a view for explaining the structure of the antenna substrate first surface according to an embodiment of the present invention.

6 is a view for explaining the structure of the antenna substrate second surface according to an embodiment of the present invention.

7 is a view for explaining the configuration of the connection terminal disposed on one surface of the antenna substrate according to an embodiment of the present invention.

8 is a view for explaining the structure of a transmitting coil assembly according to an embodiment of the present invention.

FIG. 9 is a diagram illustrating a detailed structure of reference numeral 900 of FIG. 5.

10 shows a substrate equipped with an electromagnetic interference filter according to the prior art.

FIG. 11 is a graph showing experimental results showing EMI shielding performance of the electromagnetic interference filter of FIG. 10.

FIG. 12 is a graph showing experimental results showing EMI shielding performance of the electromagnetic interference filter of FIG. 5.

13A to 13D are diagrams for describing an arrangement of a wireless power transmission antenna and a short range wireless communication antenna according to an embodiment of the present invention.

14 is a view for explaining the harmonics of the wireless power signal and the frequency band of the short-range wireless communication signal according to an embodiment of the present invention.

FIG. 15 is a diagram for describing an electromagnetic interference filter, according to an exemplary embodiment.

FIG. 16 is a diagram illustrating a matching circuit of an electromagnetic interference filter according to an exemplary embodiment of the present invention.

Wireless power transmitter according to an embodiment of the present invention is disposed between the charging bed and the transmitting coil assembly and the charging bed and the transmitting coil assembly, the antenna substrate and the transmitting coil assembly including a near field communication antenna and electromagnetic interference filter and It may include a control circuit board connected to the antenna substrate to control short-range wireless communication and wireless charging.

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, and the like.

In the description of the embodiments, where it is described as being formed on the "top" or "bottom" of each component, the top (bottom) or the bottom (bottom) is the two components are in direct contact with each other or One or more other components are all included disposed between the two components. In addition, when expressed as "up (up) or down (down)" may include the meaning of the down direction as well as the up direction based on one component.

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 system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably. In addition, as a representation of a device for receiving wireless power from a 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 Or the like can be used in combination.

Transmitter 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 floor buried, a wall hanging, etc., one transmitter is a plurality of wireless Wireless power may also be transmitted to the power receiving device. To this end, the transmitter may comprise at least one wireless power transmission means. Here, various wireless power transmission standards based on an electromagnetic induction method for generating a magnetic field in a power transmitter coil and charging using an electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field may be used.

In addition, the receiver according to an embodiment of the present invention may be provided with at least one wireless power receiving means, and may simultaneously receive wireless power from two or more transmitters. The wireless power receiver according to the present invention may be mounted on one side of the transportation device, but is not limited thereto, and the wireless power receiver may be a device capable of charging a battery by mounting the wireless power receiver according to the present invention.

In the wireless power transmitter and the wireless power receiver according to the present invention, types and characteristics may be classified into classes and categories, respectively.

The type and characteristics of the wireless power transmitter can be largely identified through the following three parameters.

First, the wireless power transmitter may be identified by a rating determined according to the strength of the maximum power applied to the resonant circuit.

Here, the rating of the wireless power transmitter is a maximum value of the power (PTX_IN_COIL) applied to the resonant circuit and the predefined maximum input power (PTX_IN_MAX) for each rating specified in the wireless power transmitter rating table (hereinafter referred to as Table 1). Can be determined by comparison. Here, PTX_IN_COIL may be an average real value calculated by dividing the product of the voltage V (t) and the current I (t) applied to the resonant circuit for a unit time by the corresponding unit time.

Class	Input power	Minimum Category Support Requirements	Maximum number of devices that can be supported
Grade 1	2 W	1 x Grade 1	1 x Grade 1
Grade 2	10 W	1 x Grade 3	2 x Grade 2
Grade 3	16 W	1 x Grade 4	2 x Grade 3
Grade 4	33 W	1 x Grade 5	3 x Grade 3
Grade 5	50 W	1 x Grade 6	4 x Grade 3
Grade 6	70 W	1 x Grade 6	5 x Grade 3

The grade disclosed in Table 1 is merely an example, and a new grade may be added or deleted. In addition, it should be noted that the values for the maximum input power for each class, the minimum category support requirement, and the maximum number of devices that can be supported may also change according to the purpose, shape, and implementation of the wireless power transmitter.

For example, referring to Table 1, when the maximum value of the power (PTX_IN_COIL) applied to the resonant circuit is greater than or equal to the PTX_IN_MAX value corresponding to class 3, and smaller than the PTX_IN_MAX value corresponding to class 4, the corresponding wireless power transmitter May be determined as Class 3.

Second, the wireless power transmitter may be identified according to Minimum Category Support Requirements corresponding to the identified class.

Here, the minimum category support requirement may be a supportable number of wireless power receivers corresponding to a category of the highest level among wireless power receiver categories that can be supported by a wireless power transmitter of a corresponding class. That is, the minimum category support requirement may be the minimum number of maximum category devices that the wireless power transmitter can support. In this case, the wireless power transmitter may support all categories of wireless power receivers corresponding to the maximum category or less according to the minimum category requirement.

However, if the wireless power transmitter can support a wireless power receiver of a category higher than the category specified in the minimum category support requirement, the wireless power transmitter may not be limited to supporting the wireless power receiver.

For example, referring to Table 1 above, a class 3 wireless power transmitter should support at least one category 5 wireless power receiver. Of course, in this case, the wireless power transmitter may support the wireless power receiver corresponding to a category lower than the category level corresponding to the minimum category support requirement.

In addition, it should be noted that the wireless power transmitter may support a wireless power receiver having a higher level category if it is determined that the wireless power transmitter can support a higher level category than the category corresponding to the minimum category support requirement.

Third, the wireless power transmitter may be identified by the maximum number of devices that can be supported corresponding to the identified class. Here, the maximum supportable device number may be identified by the maximum supportable number of wireless power receivers corresponding to the lowest level category among the categories supported in the corresponding class, hereinafter, simply the maximum number of devices that can be supported by a business card. .

For example, referring to Table 1 above, a class 3 wireless power transmitter should be able to support up to two wireless power receivers of at least category 3.

However, when the wireless power transmitter can support more than the maximum number of devices corresponding to its class, it is not limited to supporting more than the maximum number of devices.

The wireless power transmitter according to the present invention should be able to perform wireless power transmission at least up to the number defined in Table 1 within the available power, unless there is a special reason for not allowing the power transmission request of the wireless power receiver.

For example, when there is no power available to accommodate the power transmission request, the wireless power transmitter may not accept the power transmission request of the wireless power receiver. Alternatively, power adjustment of the wireless power receiver may be controlled.

As another example, if the wireless power transmitter exceeds the number of acceptable wireless power receivers when the wireless power transmitter accepts the power transmission request, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

As another example, when the category of the wireless power receiver requesting power transmission exceeds the category level supported by its class, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

As another example, when the internal temperature exceeds a reference value, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

Hereinafter, the type and characteristics of the wireless power receiver will be described.

The average output voltage PRX_OUT of the receiver may be a real value calculated by dividing the product of the voltage V (t) and the current I (t) output by the rectifier for a unit time by the corresponding unit time.

The category of the wireless power receiver may be defined based on the maximum output voltage PRX_OUT_MAX of the rectifier, as shown in Table 2 below.

Category	Input power	Application example
Category 1	TBD	Bluetooth handset
Category 2	3.5 W	Feature Phone
Category 3	6.5 W	Smartphone
Category 4	13 W	Tablet
Category 5	25 W	Small laptop
Category 6	37.5 W	laptop
Category 6	50 W	TBD

For example, when the charging efficiency at the load stage is 80% or more, the category 3 wireless power receiver may supply 5W of power to the charging port of the load.

The grades and categories disclosed in Table 1 and Table 2 are merely exemplary, and some grades and categories may be added or deleted. In addition, the maximum input power for each grade and category shown in Table 1 and Table 2, and an example of an application may be changed depending on the purpose, shape and implementation form as well as the wireless charging standard applied to the wireless power transmitter and the wireless power receiver. Be careful.

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

Referring to FIG. 1, a wireless charging system includes a wireless power transmitter 10 that largely 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 for exchanging information 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 transmitting and receiving end may include information for identifying a category of the wireless power receiver, information for identifying a current power reception state of the wireless power receiver, information on whether the overvoltage protection function is installed, wireless Software version information, power control request information, and the like mounted on the power receiver may be included.

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, the unidirectional communication may be performed by the wireless power receiver 20 only transmitting information 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. In this case, when the quick charge request button is selected by the user, the electronic device 30 may transmit a predetermined quick charge request signal to the wireless power receiver 20. The wireless power receiver 20 may convert the normal low power charging mode into the fast charging mode by generating a charging mode packet corresponding to the received fast charging request signal to the wireless power transmitter 10.

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

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 the plurality of wireless power receivers in a time division manner, but is not limited thereto. As another example, the wireless power transmitter 10 may distribute and transmit power to a plurality of wireless power receivers by using different frequency bands allocated for each wireless power receiver.

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 required power for each wireless power receiver, a state of charge of a battery, power consumption of an electronic device, and available power of the wireless power transmitter. Can be adaptively determined based on the

As another example, as shown at 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 connected to a plurality of wireless power transmitters at the same time, 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 is adaptively based on the required power of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, the available power 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.

3 is a view for explaining an electromagnetic interference problem generated during wireless charging in a vehicle.

As shown in FIG. 3, a wireless power transmitter 100 may be mounted on one side of the vehicle. The wireless power transmitter 100 may generate an AC power signal using a vehicle internal power source, and wirelessly propagate the AC power signal through the provided transmission coil to charge the wireless power receiver 600 disposed in the charging bed. .

An audio video navigation (AVN) system mounted on one side of the vehicle centerfayer may be connected to an antenna mounted inside or outside the vehicle. The vehicle occupant may listen to radio or watch TV broadcast using radio waves received through an internal / external antenna.

When charging is started between the wireless power transmitter 100 and the wireless power receiver 600, the wireless power transmitter may generate an AC power signal in an operating frequency band and wirelessly transmit it through a transmission coil. In this case, harmonic components as well as the AC power signal may be output. In this case, some harmonic components may correspond to the FM / AM radio frequency band and / or the TV viewing frequency band. In this case, the harmonic component may act as an interference to the radio reception signal and / or the TV reception signal, which may degrade the radio listening sensitivity or (and) TV reception sensitivity.

4 is an exploded perspective view of a wireless charging device (hereinafter, referred to as a wireless power transmitter) according to an embodiment of the present invention.

Referring to FIG. 4, the wireless power transmitter 400 includes a charging bed 410, a first substrate 420 (hereinafter referred to as an antenna substrate), a coil assembly 430 (hereinafter referred to as a transmit coil assembly), and a second substrate 440 (hereinafter referred to as a shielding member). ) And a control circuit board 450.

An NFC antenna may be disposed on a first surface of the antenna substrate 420, and an EMI filter may be disposed on a second surface of the antenna substrate 420. Here, the first surface may be a surface in contact with the transmitting coil assembly 430, the second surface may be a surface in contact with the charging bed 410, but is not limited thereto.

The antenna substrate 420 may be electrically connected to the control circuit board 450.

An NFC antenna and an EMI filter may be disposed on one surface and the other surface of the antenna substrate 420, respectively. For example, the NFC antenna and the EMI filter may be pattern printed on the antenna substrate 420. In this case, the NFC antenna and the EMI filter may be pattern printed on the corresponding surface of the antenna substrate 420 so as not to overlap each other.

For example, the EMI filter may be implemented such that a frequency signal exceeding an operating frequency band for wireless charging is cut off. For example, the operating frequency band may be 110 kHz to 205 kHz, but is not limited thereto and may be different according to a standard specification applied to a wireless power transmitter.

For example, when the NFC antenna is a loop antenna, the EMI filter may be disposed inside the loop of the NFC antenna. In addition, the NFC antenna and the transmitting coil assembly 430 may be disposed so as not to overlap each other. The transmitting coil assembly 430 according to an embodiment of the present invention may include a plurality of coils, and adjacent coils may be partially overlapped. For example, as illustrated in FIG. 4, the transmitting coil assembly 430 may include three coils, and adjacent coils may be partially overlapped.

The shape of the EIM filter will be described in detail with reference to FIG. 5 to be described later.

The shielding member 440 may block electromagnetic waves generated by the transmitting coil assembly 430 from being transmitted to the control circuit board 450. In addition, the shielding member 440 may include a heat dissipation structure for dissipating heat generated by the transmitting coil 430.

The shielding member 440 may further include a receiving part (not shown) for receiving the transmitting coil assembly 430. Here, the receiving part may be made of the same material as the shielding member 440 or may be made of a different material.

For example, the shielding member 440 and the receiving portion may be composed of a sand dust block that is integrally injection molded. As another example, the shielding member 440 may be implemented in the form of a ferrite shielding sheet and / or a metal sheet to which the shielding sheet is attached, and the receiving portion may be molded of plastic resin and bound to the metal sheet.

The shielding member 440 has a terminal at one side thereof and may be connected to both ends of the coil of the transmitting coil assembly 430. Of course, the transmitting coil assembly 430 may be electrically connected to the control circuit board 450 through the corresponding terminal.

The control circuit board 450 may include a power converter for converting an external power source into an AC power signal for wireless charging.

In addition, the control circuit board 450 may include a modulator and a demodulator for in-band and / or out-of-band communication with the wireless power receiver.

In addition, the control circuit board 450 may include a sensing circuit that measures a voltage, a current, a temperature, etc. at a specific position in the wireless power transmitter 400.

In addition, the control circuit board 450 may include a controller for controlling the overall operation of the wireless power transmitter 400. Here, the controller may be implemented in the form of a microprocessor, a digital signal processor (DSP), an ASIC, and may operate in conjunction with a memory in which programs and various data are stored, but the form of the controller is not particularly limited.

In addition, the control circuit board 450 may include an NFC processing processor for NFC signal processing.

The transmission coil assembly 430 may include a plurality of transmission coils having a step, and the shape of the electromagnetic interference filter disposed on one surface of the antenna substrate 420 may be determined based on the step.

For example, the electromagnetic interference filter may include a conductive line connected to the ground terminal and a plurality of pattern filters branched from the conductive line. In this case, the slit direction of the pattern filter may be different depending on the step of the transmitting coil. For example, the slit directions of the pattern filters having different steps may be disposed to be orthogonal to each other.

5 is a view for explaining the structure of the antenna substrate first surface according to an embodiment of the present invention.

On the first surface 5a of the antenna substrate 500 according to an embodiment, an electromagnetic interference filter-a business card called an EMI filter-is disposed for convenience of description. The second surface 5b of FIG. 6 will be described later. A near field communication antenna may be disposed.

Here, the near field communication antenna may include a near field communication (NFC) antenna, a radio frequency identification (RFID) communication antenna, a magnetic security transfer (MST) antenna, etc. Hereinafter, the short range wireless communication antenna will be described with an example of an NFC communication antenna.

In the following embodiment, as shown in FIG. 8 to be described later, the first to third coils 801, 802, and 803 are mounted on the wireless power transmitter, and include a transmitting coil assembly in which two adjacent coils are partially overlapped. A three coil wireless power transmitter will be described as an example.

Referring to FIG. 5, the first surface 5a of the antenna substrate 500 is largely branched from one side of the loop-shaped first conductor 503 and the first conductor 503 to have a comb-shaped slit structure and has a first shape. The first pattern filter 511 and the second pattern filter 512 disposed in the pattern region, the third pattern filter 513 and the connection terminal 530 disposed in the second pattern region may be included. Here, it should be noted that the first to third pattern filters 511, 512, and 513 are electrically connected to each other through the first conductive line 503.

The slit arrangement of the third pattern filter 511 disposed in the center of the first surface 5a may be different from the slit arrangement of the first pattern filter 511 and the second pattern filter 512. For example, as shown in FIG. 5, the slit arrangement direction of the third pattern filter 513 and the slit arrangement direction of the first pattern filter 511 and the second pattern filter 512 may be designed to be orthogonal to each other. .

In addition, the third pattern filter 513 may be disposed to correspond to the shape or outer diameter of the first transmission coil 801 disposed at the upper center in the transmission coil assembly having the three coil structure of FIG. 8.

For example, the third pattern filter 513 may be designed to be larger than the outer diameter of the first transmission coil 801 and disposed inside the loop of the first conductive line 503. Of course, the first pattern filter 511 and the second pattern filter 512 may also be designed to be disposed inside the loop of the first conductive line 503.

The first pattern region may have a first slit structure, and the second pattern region may have a second slit structure.

The first slit structure includes a plurality of spaced apart conductive wires, and the plurality of spaced conductive wires may have different lengths.

The second slit structure includes a plurality of spaced apart conductive wires, and the plurality of spaced apart conductive wires may have different lengths.

Referring to FIG. 8 to be described later, coil lengths of the third coil 803 disposed in the center and the first coil 801 and the second coil 802 disposed in the side may be different, and accordingly, the center and the side The inductance values of the transmitting coils arranged at may be different.

In consideration of different inductance values of the coil, the first pattern region and the second pattern region may also have different inductance values, shapes, and lengths, thereby optimizing the electromagnetic interference shielding effect.

In consideration of the different positional relationship of the coils, the first pattern region and the second pattern region also have different inductance values, shapes, and lengths, thereby optimizing the electromagnetic interference shielding effect.

An area of the first pattern region may be smaller than an area where the first coil 801 or the second coil 802 is disposed.

An area of the second pattern region may be larger than an area where the third coil 803 is disposed. Therefore, electromagnetic waves generated in the third coil 803 disposed in contact with the second substrate in the center can be effectively blocked.

5 and 6 to be described later, the NFC antenna 540 may be disposed on the second surface 5b of the antenna substrate 500 along the outer diameter of the first conductive wire 503 having a loop shape. . The actual NFC antenna 540 is disposed in the corresponding area of the second surface 5b corresponding to the card number 520 of the first surface 5a, hereinafter referred to as 520, for convenience of description. Be careful.

However, when there are a plurality of windings of the NFC antenna 540, one end 542 and the other end 543 of the NFC antenna 540 are connected through the through holes (Through Hole or Via Hole), respectively (see FIG. 7). It may be electrically connected to a corresponding terminal of the 530. To this end, some sections 509 of the windings of the NFC antenna 540 may be designed to be disposed in the NFC antenna region 520 of the first surface 5a. Both ends of the portion 509 of the winding of the NFC antenna 540 may be connected to reference numerals 544 and 545 of FIG. 6, which will be described later, through through holes, respectively.

First to fifth connection structures 504, 505, 506, 507, and 508 for electrically connecting the first conductive line 503 and the pattern filters 511, 512, and 513 are disposed on the first surface 5a. Can be.

Here, the number and positions of the connection structures disposed on the first surface 5a to electrically connect the first conductive wires 503 and the respective pattern filters may be different according to the design purpose of those skilled in the art.

Referring to FIG. 5, the first pattern filter 511 may be connected to the first conductive line 503 through the first to second connecting structures 504 and 505 and the formulation 2 connecting conductive line 540. Current flowing through the first pattern filter 511 through the first to second connection structures 504 and 505 and the second connection lead 540-1 may be evenly distributed to each slit.

In addition, the second pattern filter 512 may be connected to the first conductive line 503 through the third to fourth connecting structures 506 and 507 and the second connecting conductive line 540-2. Current flowing through the second pattern filter 512 through the third to fourth connection structures 506 and 507 and the second connection lead 540-2 may be evenly distributed to each slit.

In addition, the third pattern filter 513 may be connected to the first conductive line 503 through the fifth connecting structure 508 and the third connecting conductive line 550. Current flowing through the third pattern filter 513 through the fifth connection structure 508 and the third connection lead 550 may be evenly distributed to each slit.

The second connection leads 540-1 and 540-2 may have a straight line shape. Therefore, the electromagnetic interference filter may be disposed so as not to overlap the NFC antenna disposed on the second surface.

The third connection lead 550 may have a curved shape. Therefore, the third connection lead 550 may be disposed in consideration of the shape and arrangement of the electromagnetic interference filter and the coil module.

A spacer 560 may be disposed between the first pattern region and the second pattern region that are separated from the third pattern region through the third pattern region and the third connection lead 550. Each pattern region or pattern filter may be divided by the spacer 560 to form an optimized electromagnetic interference filter according to the coil shape.

The arrangement structure 900 of the spacers 560 forming the boundaries of the different patterns is shown in detail in FIG. 9.

One end and the other end of the first wire 503 disposed adjacent to each other may be connected to the first terminal 531 and the second terminal 532 of the connection terminal 530, respectively. For example, both the first terminal 531 and the second terminal 532 may be connected to ground.

A detailed configuration of the connection terminal 530 disposed on the first surface 5a of the antenna substrate 500 will be described in detail with reference to FIG. 7 to be described later.

6 is a view for explaining the structure of the antenna substrate second surface according to an embodiment of the present invention.

Referring to FIG. 6, an NFC antenna 540 having a loop shape may be disposed on the second surface 5b of the antenna substrate 500. NFC antenna 540 may have a plurality of windings.

For example, as shown in FIG. 6, when the number of turns of the NFC antenna 540 is 2, as shown in reference numeral 610, two turns may be arranged to cross each other in some sections.

544 and 545 may be electrically connected to each other by a conductive wire 509 disposed on the first surface 5a, as described above with reference to FIG. 5.

Accordingly, as shown in reference numeral 620, one end 542 and the other end 543 of the NFC antenna 540 has the advantage that can be arranged on the line of the same turn. Here, one end 542 may be connected to the third terminal 533 of FIG. 7 to be described later through the through hole, and the other end 543 may be connected to the fourth terminal 534 of FIG. 7 to be described later through the through hole. .

For example, NFC communication may be applied with a differential Manchester encoding scheme. In this case, the third terminal 533 and the fourth terminal 534 may be connected to the positive signal terminal and the negative signal terminal, respectively, but are not limited thereto, and may be connected to the opposite side.

A terminal branched from one side of the outermost turn of the NFC antenna 540-a branch terminal 541 for convenience of explanation, may be connected to the fifth terminal 535 of FIG. 7 to be described later through a through hole. . Here, the fifth terminal 535 may be connected to the ground terminal provided in the control circuit board 450.

7 is a view for explaining the structure of the connection terminal disposed on the antenna substrate according to an embodiment of the present invention.

The connection terminal 530 according to an embodiment may be disposed on one side of the first surface 5a on which the pattern filter is disposed, as in the above-described embodiment of FIG. 5.

Each terminal included in the connection terminal 530 may be electrically connected to a corresponding terminal provided with the control circuit board 450.

As illustrated in FIG. 7, the connection terminal 530 may include first to fifth terminals 531, 531, 533, 534, and 535.

The first terminal 511 and the second terminal 512 may be connected to one end and the other end of the first conductive line 503, respectively. Both the first terminal 511 and the second terminal 512 may be connected to the ground terminal provided in the control circuit board 450.

The third terminal 533 and the fourth terminal 534 may be connected to one end 542 and the other end 543 of the NFC antenna 540 through the first through hole 536 and the second through hole 537, respectively. have.

When differential Manchester encoding is applied to the NFC communication, the third terminal 533 and the fourth terminal 534 may be connected to the positive signal terminal and the negative signal terminal provided on the control circuit board 450, respectively. However, the present invention is not limited thereto and may be connected in reverse.

The fifth terminal 535 may be connected to the terminal 541 branched from the winding middle of the NFC antenna 540 through the third through hole 538. For example, although the branch may be branched from one side of the outermost turn of the NFC antenna 540, the branching position is not limited.

The fifth terminal 535 may be connected to the ground terminal provided in the control circuit board 450.

8 is a view for explaining the structure of a coil assembly (hereinafter referred to as a transmitting coil assembly) according to an embodiment of the present invention.

Referring to FIG. 8, the transmitting coil assembly 800 includes a first coil 801, a second coil 802, a third coil 803, a substrate 810, a receiving part 820, and a connection terminal 830. It may be configured to include.

The connection terminal 830 may be disposed on one side of the substrate 810 and may be electrically connected to the control circuit board 450.

As shown in FIG. 8, the first coil 801 and the second coil 802 are disposed adjacent to each other at a central portion of the substrate 810, and formed on the first coil 801 and the second coil 802. Three coils 803 may be disposed.

In this case, the third coil 803 may be disposed to overlap some regions of the first coil 801 and the second coil 802. The first coil 801 and the second coil 802 disposed on both side surfaces of the third coil 803 and the third coil 803 disposed on the substrate 810 have mutually different heights from the substrate 810. Can be different.

That is, a step may be formed between the third coil 803, the first coil 801, and the second coil 802. In order to compensate the coupling characteristic according to the step, the winding length of the third coil 803 and the winding length of the first coil 801 and the second coil 802 may be designed differently.

In this case, the impedance characteristics of the third coil 803 and the impedance characteristics of the first coil 801 and the second coil 802 may be different from each other due to the step, and accordingly, the high frequency characteristics of the third coil 803 are different. The high frequency characteristics of the first and second coils 801 and 802 may be different. Therefore, as shown in FIG. 5, the shape of the pattern filter and the direction of the slit may be designed to be different from the center and side.

As shown in FIG. 8, the accommodating part 820 may be plastic injection-molded to accommodate the transmitting coil, but this is only one embodiment, and the substrate 810 and the accommodating part 820 are integrated into one. It may be injection molded in the form of a sand dust block. One side of the sandust block may include an accommodating groove for accommodating the connection terminal 830.

The wireless charging device according to the embodiment may be a wireless power transmitter or a wireless power receiver.

Wireless charging device according to an embodiment comprises a coil assembly; A first substrate disposed on the coil assembly; An electromagnetic interference filter disposed on the first surface of the first substrate; And a wireless communication antenna disposed on a second surface of the first substrate, wherein the coil assembly includes a plurality of coils, and the electromagnetic interference filter includes a plurality of different pattern regions corresponding to the plurality of coils. It may include.

In an embodiment, the coil assembly may include a first coil, a second coil, and a third coil, wherein the first coil and the second coil are disposed on a second substrate, and the third coil is the first coil. The plurality of different pattern regions disposed on the coil and the second coil, and the plurality of different pattern regions include a first pattern region corresponding to the first coil or the second coil and a second pattern region corresponding to the third coil. can do.

The electromagnetic interference filter according to the embodiment may include a first conductive line disposed in a loop shape on the second surface.

In an embodiment, the first pattern region may be connected through a first connection structure positioned at both side regions of the first conductive line, and the second pattern region may be connected through a second connection structure positioned in a center region of the first conductive line. Can be.

The first connection structure according to the embodiment may be a plurality.

In an embodiment, the first pattern region may include a second connection lead connected to the first connection structure, and the second pattern region may include a third connection lead connected to the second connection structure. The conductive wire may be smaller in width than the first conductive wire or the second conductive wire.

In an embodiment, the first pattern region may include a first slit structure disposed in a first direction in the second connection conductor, and the second pattern region may be arranged in a second direction in the third connection conductor. It may include a slit structure.

According to an embodiment, the first direction and the second direction may be different from each other.

The first direction and the second direction according to the embodiment may be perpendicular to each other.

In an embodiment, the first pattern region may be spaced apart from the first coil or the second coil, and the second pattern region may be disposed in contact with the third coil.

In some embodiments, the first pattern region and the second pattern region may have different inductance values.

The first pattern area may be smaller than an area in which the first coil or the second coil is disposed.

The second pattern area may be larger than an area in which the third coil is disposed.

In an exemplary embodiment, an area of the first pattern region and the second pattern region may be different from each other.

The first pattern region and the second pattern region according to the embodiment may have different shapes.

The second pattern region may be disposed between two first pattern regions.

In an embodiment, a spacer may be disposed between the first pattern region and the second pattern region.

The second connection lead may have a straight shape, and the third connection lead may have a curved shape.

According to an embodiment, the first slit structure may include a plurality of spaced apart conductive wires, and the plurality of spaced apart conductive wires may have different lengths.

According to an embodiment, the second slit structure may include a plurality of spaced apart conductive wires, and the plurality of spaced apart conductive wires may have different lengths.

According to an embodiment, the width of the first connection structure may be smaller than the width of the second connection structure.

10 shows a substrate equipped with an electromagnetic interference filter according to the prior art.

As shown in FIG. 10, the conventional electromagnetic interference filter 1010 is an electromagnetic interference filter 1010 regardless of the arrangement form of the coils disposed in the coil assembly and the height difference from the bottom surface of the substrate constituting the coil assembly. All the slits 1011 constituting the are arranged in the same direction.

Here, the height difference of the coils may be generated when the third coil 803 is disposed to overlap some regions of the first coil 801 and the second coil 802, as described above with reference to FIG. 8. .

At this time, the third coil 803 and the second coil 801 and the second coil 802 disposed on both sides of the lower end of the third coil 803 disposed on the top of the substrate 810, respectively, by a step The impedance characteristics and the high frequency characteristics of the may vary.

FIG. 11 is a graph showing experimental results showing EMI shielding performance of the electromagnetic interference filter of FIG. 10.

Reference numerals 1110 and 1120 of FIG. 11 show patterns of change in peak and average values of electromagnetic waves measured in an AM frequency band and an FM frequency band, respectively.

As shown in reference numeral 1110 of FIG. 11, in the conventional electromagnetic interference filter, in which the coil arrangement form and the step are not considered, the EMI shielding performance in the AM frequency band satisfies the peak reference value (PK, 1211). It can be seen that AV 1212 is not satisfied. Here, when the measured value is smaller than the reference value, it is determined that the EMI shielding performance in the corresponding frequency band satisfies the reference value, and when the measured value is larger than the reference value, the EMI shielding performance in the corresponding frequency band satisfies the reference value. Can be judged.

In addition, referring to reference numeral 1120 of FIG. 11, it can be seen that the electromagnetic interference filter of FIG. 10 does not satisfy not only the average reference value AV and 1222 but also the peak reference value PK and 1221 in the FM frequency band.

FIG. 12 is a graph showing experimental results showing EMI shielding performance of the electromagnetic interference filter of FIG. 5.

Reference numerals 1210 and 1220 of FIG. 12 show patterns of change in peak and average values of electromagnetic waves measured in an AM frequency band and an FM frequency band, respectively.

As shown in reference numeral 1210 of FIG. 12, the electromagnetic interference filter to which the direction and pattern of the slit is applied in consideration of the coil arrangement shape and the step is used in the AM frequency band (PK, 1111) and average reference value (AV, 1112). It can be seen that all satisfy.

In addition, referring to reference numeral 1220 of FIG. 12, it is understood that the electromagnetic interference filter disclosed in FIG. 5 satisfies both the average reference value (AV, 1122) and the peak reference value (PK, 1121) even in the FM frequency band. Can be.

Therefore, it can be seen that the wireless charging device including the electromagnetic interference filter designed in consideration of the coil arrangement and the step is superior to the EMI shielding performance compared to the electromagnetic interference filter, which is not considered the conventional coil arrangement and step.

13A to 13D are diagrams for describing an arrangement of a wireless power transmission antenna and a short range wireless communication antenna according to an embodiment of the present invention.

In the present invention, the wireless power transmission antenna 1310 is not limited to the wireless power transmission scheme. In other words, the wireless power transmission antenna may receive power by at least one of electromagnetic induction, electromagnetic resonance, RF wireless power transmission, or other wireless power transmission.

In addition, in the present invention, the wireless power transmission 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, a wireless power antenna that receives power according to an electromagnetic resonance method may receive power in a resonance method defined by an A4WP (Alliance for Wireless Power) standard apparatus.

The present invention is due to the fact that the near field communication antenna 1320 may be affected by the transmission and reception of a signal by a magnetic field, a power signal, or an RF signal for wireless power transmission. Accordingly, the present invention is located in an area where the near field communication antenna 1320 may receive radio interference from the radio power transmitting antenna 1310 in relation to the arrangement of the near field communication antenna 1320 and the wireless power transmitting antenna 1310. Arrangement in any case may be included as an embodiment. That is, according to the present invention, the short range wireless communication antenna 1320 is disposed on the short distance wireless communication antenna 1320 and the wireless power transmission antenna 1310 for wireless power transmission (for example, a power signal or a power control signal). Any placement case can be included if it can be affected.

In particular, if the wireless power transfer is fast charging (e.g. when the output voltage is 5V and the output current is 2A) other than normal charging (e.g. when the output voltage is 9V and the output current is 1.67A) The distance may be greater, and the present invention is not limited to the adjacent distance between the short range wireless communication antenna 1320 and the wireless power transmission antenna 1310.

13A to 13D, the wireless power transmission antenna 1310 and the short range wireless communication antenna 1320 may be adjacent to each other. According to an embodiment, the short range wireless communication antenna 1320 and the wireless power transmission antenna 1310 may be disposed adjacent to each other, but may not be overlapped on the same plane. According to an embodiment, the wireless power transmitting antenna 1310 and the short range wireless communication antenna 1320 may be disposed on different planes, and overlapping areas when viewed from the front of the wireless power transmitter even when disposed on different planes. It can be arranged so that they do not overlap. This is to reduce the influence of the short range wireless communication antenna 1320 by the wireless power signal.

The number, size, and position of the short range wireless communication antenna 1320 are not limited to FIGS. 13A to 13D.

When the control module (not shown) of the short range wireless communication antenna 1320 controls one short range wireless communication antenna 1320, it may be classified into a one-way structure, and one control module has two control modules. When controlling the short range wireless communication antenna 1320, it may be classified into a 2-way structure. According to an embodiment, the number of control modules included in the wireless power transmitter may also include a plurality of one-way structures corresponding to the number of short range wireless communication antennas 1320. In order to expand an area in which short-range wireless communication is allowed (an area capable of transmitting and receiving short-range wireless communication signals), a plurality of short range wireless communication antennas 1320 and a plurality of control modules may be included in the wireless power transmitter.

As shown in FIG. 13A, one short range wireless communication antenna 1320 included in the wireless power transmitter 1300a may be disposed outside the one wireless power transmitting antenna 1310 on the same plane.

As illustrated in FIG. 13B, a plurality of short range wireless communication antennas 1320 included in the wireless power transmitter 300b may be provided. The short range wireless communication antenna 1320 may be disposed adjacent to the left and right sides on the same plane as the wireless power transmission antenna 1310. The short range wireless communication antenna 1320 disposed on both sides of the wireless power transmission antenna 1310 may extend a recognition area of the short range wireless communication signal.

According to an embodiment, the wireless power transmission antenna 1310 and the short range wireless communication antenna 1320 may be spaced apart on the same plane.

As illustrated in FIG. 13C, a plurality of short range wireless communication antennas 1320 may be disposed inside and outside of the wireless power transmitter antenna 1310 included in the wireless power transmitter 1300c. Depending on the size of the antenna, the near field communication antenna 1320 may be disposed inside or outside the coplanar wireless power antenna and may be disposed on different planes.

The wireless power transmission antenna 1310 may generate a wireless power signal, and the closer the region of the wireless power transmission antenna 1310 is located, the greater the strength of the wireless power signal may be. The short range wireless communication antenna 1320 may be interrupted by a wireless power signal in transmitting and receiving short range wireless communication signals.

In order for the near field communication antenna 1320 to be less affected by the wireless power signal generated by the wireless power transmission antenna 1310 as a obstacle to the near field communication, the electromagnetic interference filter 1330 may be configured to perform the wireless power transmission antenna 1310. It may be arranged in an overlapping area.

As illustrated in FIG. 13D, a plurality of wireless power transmission antennas 1310 may be disposed inside and outside the short range wireless communication antenna 1320.

Each of the plurality of wireless power transmission antennas 1310 may generate a wireless power signal, and the closer the region to which the wireless power transmission antenna 1310 is located, the greater the strength of the wireless power signal may be. Accordingly, the short range wireless communication antenna 1320 disposed surrounded by the wireless power transmitting antenna 1310 may interfere with the wireless power signal in the transmission and reception of the short range wireless communication signal. As shown in FIG. 13C, the electromagnetic interference filter may be disposed to overlap with the wireless power transmission antenna 1310, and the antenna of the electromagnetic interference filter may also have a different pattern according to the arrangement position and the arrangement of the wireless power transmission antenna.

14 is a view for explaining the harmonics of the wireless power signal and the frequency band of the short-range wireless communication signal according to an embodiment of the present invention.

Referring to FIG. 14, a frequency band in which a high frequency signal of a frequency band 1410 of a wireless power signal that can be transmitted and received by a wireless power transmission antenna and a frequency band 1420 of short range wireless communication may overlap.

The wireless power signal may have a preset operating frequency according to a standard specification of the wireless power transmission method and the wireless power transmission antenna. As an ideal system, pure sinusoidal inputs cannot be processed without distortion. Since real systems are not ideal, they can't send or receive perfect sinusoids from either the signal's sender or receiver, and the airwaves in the air are almost sinusoidal, and they're not perfect sinusoids. Also. A multiplication component may exist as a fundamental physical property of frequency, and unwanted multiplication components from the user's point of view may cause noise, or obstacles, to antennas of other communication systems. The multiplication factor can be called the multiplication frequency and is also called harmonics.

The wireless power transmission antenna may be set to different operating frequencies according to the wireless power transmission method, and the operating frequency band of 125 kHz or 13.56 MHz may be set according to the electromagnetic induction method, and the electromagnetic resonance method may be several tens of kHz to several MHz. The operating frequency band may be set, and when the RF wireless power transmission method, an operating frequency band of 2.45 GHz or 5.8 GHz may be set.

According to an embodiment, a frequency band used to transmit and receive the wireless power signal 1410 transmitted and received by the wireless power transmission antenna may be defined as a first frequency band.

Near-field wireless communication may be NFC communication, and NFC communication uses a frequency band of 13.56 MHz and is a kind of electronic tag (RFID) technology that enables fast two-way communication between NFC devices. NFC communication can support the transmission and reception of data in both directions at a distance of less than 10cm.

According to an embodiment, the frequency band used for transmitting and receiving the short range wireless communication signal 1420 transmitted and received by the short range wireless communication antenna may be defined as a second frequency band.

According to an embodiment, the electromagnetic interference filter included in the wireless power transmitter may remove an obstacle to communication performance of the short range wireless communication antenna by blocking harmonics of the wireless power signal.

The electromagnetic interference filter may include a first filter 1430 passing a signal above a first cutoff frequency and a second filter 1440 passing a signal below a second cutoff frequency.

The first filter may be a high pass filter that passes a signal above the first cutoff frequency, and the second filter may be a low pass filter that passes a signal below the second cutoff frequency.

The electromagnetic interference filter may block signals other than a pass band between the first cutoff frequency and the second cutoff frequency, and the high frequency signals other than the second cutoff frequency may be removed from the first cutoff frequency of the wireless power signal. Accordingly, the short range wireless communication signal 1420 may not be affected by the high frequency of the wireless power signal 1410.

FIG. 15 is a diagram for describing an electromagnetic interference filter, according to an exemplary embodiment.

Referring to FIG. 15, the wireless power transmitter 1500 may wirelessly perform a short range wireless communication antenna 1510, a first filter 1520 and a second filter 1530 included in an electromagnetic wave blocking filter, and a wireless power transmitter 1500. Capacitive Sensing Sensor 540 that can sense whether a power receiver (not shown) is located, and a matching circuit 1550 that can control the frequency band cut off from the EMI filter. Can be. The components shown in FIG. 15 are not essential, such that a wireless power transmitter 1500 with more or fewer components may be implemented.

Any one of the first antenna of the first filter 1520 and the second antenna of the second filter 1530 may have a first pattern having slits in the horizontal direction, and the other one of the slits in the vertical direction with respect to the horizontal direction. It may have a second pattern having a. According to the orthogonality of the first antenna of the first filter 1520 and the second antenna of the second filter 1530, the signals blocked by each of the first filter 510 and the second filter 1520 may influence each other. It can block harmonics of wireless power signals independently without receiving them.

The first antenna of the first filter 1520 and the second antenna of the second filter 1530 may have a pattern in a vertical direction to each other, and the first antenna and the second antenna are not overlapped and stacked on different layers. Can be arranged.

FIG. 16 is a diagram illustrating a matching circuit of an electromagnetic interference filter according to an exemplary embodiment of the present invention.

Referring to FIG. 16, each of the first antenna and the second antenna of each of the first filter and the second filter of FIG. 15 may be an inductor (L) 1610 which is an inductive element in the electromagnetic interference filter. The matching circuit 1620 is an RLC resonant circuit, and the matching circuit 1620 may include capacitors C and 1621 and resistors R and 1622.

The low pass filter and the high pass filter may have a cut-off frequency, which may be determined by the element value of each filter circuit. According to an embodiment, the cutoff frequency may be determined based on the length of the first antenna and the second antenna as the inductance element of the filter. In other words, each of the first antenna and the second antenna may be determined as the first length and the second length based on the first cutoff frequency and the second cutoff frequency, respectively.

The matching circuit 1620 may include a circuit in which a resistor 1622 and a capacitor 1621 are connected in series, and may configure a low pass filter using a voltage applied to the capacitor 1621 as an output value. At the same time, a high pass filter may be configured by using, as an output value, a voltage applied to the resistor 1622 in a circuit in which the resistor 1622 and the capacitor 1621 are connected in series. In this case, the cutoff frequency fc may be 1 / (2 · π · R · C).

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.

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 can be used in the field of wireless charging, and in particular, can be applied to a wireless power transmitter having an electromagnetic shielding structure.

Claims (10)

1. Coil assembly;

   A first substrate disposed on the coil assembly;

   An electromagnetic interference filter disposed on the first surface of the first substrate; And

   A wireless communication antenna disposed on a second surface of the first substrate

   Including,

   The coil assembly includes a plurality of coils,

   The electromagnetic interference filter includes a plurality of different pattern regions corresponding to the plurality of coils.
2. The method of claim 1,

   The coil assembly,

   A first coil, a second coil, and a third coil,

   The first coil and the second coil are disposed on a second substrate,

   The third coil is disposed on the first coil and the second coil,

   The plurality of different pattern regions,

   And a second pattern region corresponding to the first coil or the second coil and a second pattern region corresponding to the third coil.
3. The method of claim 2,

   The electromagnetic interference filter may include a first conductive line arranged in a loop shape on the second surface, and the first pattern region may be connected through a first connection structure positioned at both sides of the first conductive line, and the second conductive line may be connected to the second conductive line. The pattern region is connected through a second connection structure located in the center region of the first conductive wire, the first connection structure is a plurality of wireless charging device is smaller than the width of the second connection structure of the first connection structure.
4. The method of claim 3,

   The first pattern region includes a second connection lead connected to the first connection structure.

   The second pattern region includes a third connection lead connected to the second connection structure.

   The third connecting lead has a smaller width than the first or second connecting lead.
5. The method of claim 4, wherein

   The first pattern region includes a first slit structure disposed in a first direction in the second connection lead,

   The second pattern region includes a second slit structure disposed in a second direction in the third connecting lead line.

   Here, the first slit structure and the second slit structure is composed of a plurality of spaced apart conductive wires of different lengths, wherein the first direction and the second direction is different from each other.
6. The method of claim 5,

   And the first direction and the second direction are perpendicular to each other.
7. The method of claim 2,

   The first pattern region is disposed spaced apart from the first coil or the second coil,

   The second pattern region is disposed in contact with the third coil, wherein the first pattern region and the second pattern region are different inductance value.
8. The method of claim 2,

   And the first pattern region is smaller than an area where the first coil or the second coil is disposed, and the second pattern region is larger than an area where the third coil is disposed.
9. The method of claim 2,

   The wireless charging device, wherein the first pattern region and the second pattern region differ in at least one of an area and a shape.
10. The method of claim 2,

    The second charging region is disposed between the first pattern region corresponding to the first coil and the second coil, respectively.

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