KR20180120048A - Wireless Charging Apparatus With EMI Filter - Google Patents

Abstract

The present invention relates to a wireless charging device. The wireless charging device according to an embodiment of the present invention includes 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 the second surface of the first substrate. The coil assembly may include a plurality of coils. The electromagnetic interference filter may include a plurality of different pattern regions corresponding to the plurality of coils. Accordingly, there is an advantage of providing a wireless charging device with an EMI (Electro Magnetic Interference) filter.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless charging apparatus having an electromagnetic interference filter,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a wireless charging technique, and more particularly, to a wireless charging device capable of blocking an unnecessary electromagnetic wave generated when a wireless charging is performed.

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

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

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

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

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

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

Devices using electromagnetic fields, such as wireless charging, are restricted by EMI (Electro Magnetic Interference) regulations to release electromagnetic waves above a certain size.

The wireless power transmitter generates an AC power signal having a specific operating frequency and wirelessly transmits the generated AC power signal through a transmitting coil. At this time, the wireless power transmitter can generate harmonics signals of different bands as well as signals of a desired operating frequency band. These harmonic signals have a problem in affecting the operation of other electronic devices around the wireless power transmitter. As an example, a wireless power transmitter may be mounted in the vehicle. At this time, the harmonic component generated by the wireless power transmitter may act as an interference component in the vehicle radio wave reception.

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

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems of the prior art described above, and it is an object of the present invention to provide a wireless power transmitter equipped with an EMI (Electro Magnetic Interference) filter.

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

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

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

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

Also, the electromagnetic interference filter may be disposed inside the short-range wireless communication antenna without overlapping the short-range wireless communication antenna.

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

The electromagnetic interference filter may include a first conductor connected to the ground terminal and a plurality of pattern filters diverging from the first conductor, and the slit direction of the pattern filter may be different according to the step.

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

The plurality of transmission coils and the short-range wireless communication antennas may be arranged so as not to overlap with each other.

The short-range wireless communication antenna may be an NFC (Near Field Communication) antenna.

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

Further, the loop has a plurality of turns, and the plurality of turns in some sections of the loop may cross each other through the first surface.

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.

The first surface may face the filling bed, and the second surface may face the transmission 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 can provide a wireless charging device.

An embodiment of a wireless charging apparatus includes a coil assembly, a first substrate disposed on the coil assembly, and an electromagnetic interference filter disposed on a first side of the first substrate; And a wireless communication antenna disposed on a second side 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 .

The coil assembly according to the embodiment 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 a plurality of different pattern regions disposed on the second coil 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 an embodiment may include a first conductor disposed in a loop shape on the second surface.

The first pattern region may be connected through a first connection structure located on both side regions of the first conductive line and the second pattern region may be connected through a second connection structure located in a central region of the first conductive line .

The first connection structure according to the embodiment may be plural.

The first pattern region may include a second connection line connected to the first connection structure and the second pattern region may include a third connection line connected to the second connection structure, The conductor may have a smaller width than the first conductor or the second conductor.

The first pattern region according to an embodiment may include a first slit structure disposed in a first direction at the second connection conductor, and the second pattern region may include a second slit structure disposed at a second direction Slit structure.

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

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

The first pattern region may be disposed apart from the first coil or the second coil, and the second pattern region may be disposed in contact with the third coil.

The first pattern region and the second pattern region may have inductance values different from each other.

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

The second pattern region may be larger than the area where the third coil is disposed.

The areas of the first pattern area and the second pattern area may be different from each other.

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

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

The spacing portion may be disposed between the first pattern region and the second pattern region according to the embodiment.

The spacing portion may be disposed between the first pattern region and the second pattern region according to the embodiment.

The second connection wire according to the embodiment may have a straight shape and the third connection wire may have a curved shape.

The first slit structure may include a plurality of spaced conductors, and the plurality of spaced conductors may have different lengths.

The second slit structure may include a plurality of spaced conductors, and the plurality of spaced conductors 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.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

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

An advantage of the present invention is to provide a wireless charging device equipped with an EMI (Electro Magnetic Interference) filter.

In addition, the present invention has an advantage of providing a wireless power transmitter equipped with an EMI filter capable of enhancing process efficiency and material cost by integrating an EMI filter on a substrate on which an NFC (Near Field Communication) antenna is disposed.

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

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

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
FIG. 3 is a view for explaining a problem of electromagnetic interference occurring in wireless charging in a vehicle. FIG.
4 is an exploded perspective view of a wireless power transmitter in accordance with an embodiment of the present invention.
5 is a view illustrating a structure of a first surface of an antenna substrate according to an embodiment of the present invention.
6 is a view illustrating a structure of a second surface of an antenna substrate according to an embodiment of the present invention.
7 is a view for explaining a configuration of a connection terminal disposed on one surface of an antenna substrate according to an embodiment of the present invention.
8 is a view for explaining a structure of a transmission coil assembly according to an embodiment of the present invention.
FIG. 9 is a view showing the detailed structure of the reference numeral 900 of FIG.
10 shows a substrate on which an electromagnetic interference filter according to the prior art is mounted.
11 is a graph of an experimental result showing the EMI shielding performance of the electromagnetic interference filter of FIG.
12 is a graph of an experimental result showing the EMI shielding performance of the electromagnetic interference filter of FIG.

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

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

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

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

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means and may receive wireless power from two or more transmitters at the same time. A wireless power receiver according to the present invention may be mounted on one side of a transportation device, but is not limited thereto, and may be a device equipped with wireless power receiving means according to the present invention to charge a battery.

The wireless power transmitter and the wireless power receiver according to the present invention can be classified into a class and a category, respectively.

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

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

Here, the rank of the wireless power transmitter is determined by the maximum power of the power (PTX_IN_COIL) applied to the resonance circuit by the predefined maximum input power (PTX_IN_MAX) according to the rating specified in the wireless power transmitter class table - Can be determined. Here, PTX_IN_COIL may be an average real number value calculated by dividing the product of the voltage V (t) and the current I (t) applied to the resonance circuit for a unit time by the unit time.

Class Maximum Input Power Min Category
Support Requirements Support Max
Number of devices Class 1 2W 1 x grade 1 1 x grade 1 Grade 2 10W 1 x Grade 3 2 x Grade 2 Grade 3 16W 1 x rating 4 2 x Grade 3 Grade 4 33W 1 x Grade 5 3 x Grade 3 Rating 5 50W 1 x grade 6 4 x Grade 3 Rating 6 70W 1 x grade 6 5 x Grade 3

The grades disclosed in Table 1 above are merely one example, and new grades may be added or deleted. It should also be noted that the values for the maximum input power per class, the minimum category support requirements, and the maximum number of devices that can be supported may vary depending on the use, configuration, and implementation of the wireless power transmitter.

For example, referring to Table 1, if the maximum value of the power (PTX_IN_COIL) applied to the resonance circuit is greater than or equal to the PTX_IN_MAX value corresponding to the class 3 and smaller than the PTX_IN_MAX value corresponding to the class 4, Can be determined as a grade 3.

Second, the wireless power transmitter may be identified according to the 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 the highest level category of the wireless power receiver category that the wireless power transmitter of the corresponding class can support. That is, the minimum category support requirement may be the minimum number of maximum category devices that the wireless power transmitter can support. At this time, the wireless power transmitter may support all categories of wireless power receivers corresponding to less than the maximum category 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, then the wireless power transmitter may not limit its support of 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 a wireless power receiver that falls into a category lower than the category level corresponding to the minimum category support requirement.

It should also be noted that the wireless power transmitter may support a wireless power receiver with a higher level category if it is determined that it is capable of supporting 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 supportable devices corresponding to the identified class. Here, the maximum number of devices that can be supported may be identified by the maximum number of supportable wireless power receivers corresponding to the lowest-level category among the categories that can be supported by the rating - hereinafter simply referred to as the maximum number of supportable devices .

For example, referring to Table 1 above, a Class 3 wireless power transmitter should be able to support up to two wireless power receivers with a minimum category of 3.

However, when the wireless power transmitter can support more than the maximum number of devices corresponding to its own rating, it does not limit to support more than the maximum number of devices.

The wireless power transmitter according to the present invention must be capable of performing at least the wireless power transmission within the available power up to the number defined in Table 1 if there is no particular reason not to allow the power transmission request of the wireless power receiver.

In one example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if there is not enough available power to accommodate the power transfer request. Alternatively, the power adjustment of the wireless power receiver can be controlled.

In another example, the wireless power transmitter may not accept a power transfer request of the wireless power receiver if the number of acceptable wireless power receivers is exceeded upon accepting the power transfer request.

In another example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if the category of the wireless power receiver requesting power transmission exceeds a category level that is supported in its rating.

In another example, a wireless power transmitter may not accept a power transfer request from the wireless power receiver if the internal temperature exceeds a reference value.

The types and characteristics of the wireless power receiver will be described below.

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

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

category
(Category) Maximum Input Power Application example Category 1 TBD Bluetooth Handset Category 2 3.5 W Feature phone Category 3 6.5 W Smartphone Category 4 13W Tablet Category 5 25W Small laptop Category 6 37.5 W laptop Category 6 50W TBD

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

The classes and categories disclosed in the above Tables 1 and 2 are only one example, and some classes and categories may be added or deleted. In addition, examples of maximum input power and application by class and category shown in Tables 1 and 2 above may be changed according to usage, shape, implementation type as well as wireless charging standard applied to wireless power transmitter and wireless power receiver .

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

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

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission.

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

For example, information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include control information as well as status information of each other. Here, the state information and control information exchanged between the transmitting and receiving ends include information for identifying the category of the wireless power receiver, information for identifying the current power receiving state of the wireless power receiver, information about whether or not the overvoltage protection function is mounted, Software version information mounted on the power receiver, power control request information, and the like.

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

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

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

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

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

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

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

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

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

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

FIG. 3 is a view for explaining a problem of electromagnetic interference occurring in wireless charging in a vehicle. FIG.

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 alternating power signal using the in-vehicle power source and wirelessly propagate the alternating power signal through the provided transmitting coil to charge the wireless power receiver 600 disposed in the charging bed .

An AVN (Audio Video Navigation) system installed at one side of the vehicle center pager can be connected to an antenna mounted inside / outside the vehicle. The vehicle occupant can listen to the radio or watch the TV broadcast by using radio waves received through the in-vehicle / external antenna.

When charging is initiated between the wireless power transmitter 100 and the wireless power receiver 600, the wireless power transmitter may generate an AC power signal in the operating frequency band and transmit it wirelessly via the transmit coil. At this time, harmonic components as well as AC power signals can be output. At this time, some harmonic components may correspond to the FM / AM radio frequency band or (and) the TV viewing frequency band. In this case, the harmonic component may interfere with the radio received signal and / or the TV received signal, which may degrade radio listening sensitivity and / or 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.

4, a wireless power transmitter 400 includes a charging bed 410, a first substrate 420, a coil assembly 430, and a second substrate 440, And a control circuit board 450, as shown in FIG.

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

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

NFC antennas and EMI filters 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. At this time, the NFC antenna and EMI filter may be pattern-printed on the corresponding surface of the antenna substrate 420 so as not to overlap each other.

In one example, the EMI filter can be implemented such that frequency signals exceeding the operating frequency band for wireless charging are blocked. For example, the operating frequency band may be 110 kHz to 205 kHz, but is not limited thereto and may vary according to standard specifications applied to the 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 transmission coil assembly 430 may be arranged so as not to overlap each other. The transmission coil assembly 430 according to an embodiment of the present invention may include a plurality of coils, and the adjacent coils may be partially overlapped. For example, as shown in FIG. 4, the transmission coil assembly 430 may be composed of three coils, and adjacent coils may be disposed in a partially overlapped manner.

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

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

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

For example, the shielding member 440 and the receiving portion may be formed of a sandstroke block integrally injection-molded. As another example, the shielding member 440 may be realized in the form of a metal plate having a ferrite-based shielding sheet and / or a shielding sheet, and the receiving portion may be formed of plastic resin and bonded to the metal plate.

The shielding member 440 may have a terminal on one side and may be connected to both ends of the coil of the transmission coil assembly 430. Of course, the transmission 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.

The control circuit board 450 may also include a modulator and demodulator for in-band or (and) out-of-band communications with the wireless power receiver.

The control circuit board 450 may also include a sensing circuit that measures voltage, current, temperature, etc. at a particular location within 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), or 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 transmit coil assembly 430 may include a plurality of transmit coils having steps and the shape of the electromagnetic interference filter disposed on one side of the antenna substrate 420 may be determined based on the step.

For example, the electromagnetic interference filter may include a conductor connected to the ground terminal and a plurality of pattern filters diverging from the conductor. In this case, the slit direction of the pattern filter may be different depending on the step of the transmission coil. In one example, the slit directions of the pattern filters having different step differences can be arranged orthogonal to each other.

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

An electromagnetic interference filter (hereinafter referred to as an EMI filter) is disposed on the first surface 5a of the antenna substrate 500 according to an embodiment and a second surface 5b of FIG. 6 A short-range wireless communication antenna may be disposed.

Herein, the short-range wireless communication antenna may include a near field communication (NFC) antenna, a radio frequency identification (RFID) communication antenna, and a magnetic security transfer (MST) Hereinafter, it is assumed that the short-range wireless communication antenna is an NFC communication antenna.

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

5, the first surface 5a of the antenna substrate 500 is divided into a loop-shaped first conductor 503, a first conductor 503, and a comb-like slit structure. A first pattern filter 511 and a second pattern filter 512 disposed in the pattern region, a third pattern filter 513 disposed in the second pattern region, and a connection terminal 530. Note that the first through third pattern filters 511, 512, and 513 are electrically connected to each other through the first conductive line 503.

The shape of the slit arrangement of the third pattern filter 511 disposed at the center of the first surface 5a may be different from that of the slit arrangement of the first pattern filter 511 and the second pattern filter 512. [ 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 corresponding to the shape or outer diameter of the first transmission coil 801 disposed at the upper center of the transmission coil assembly having the three-coil structure of FIG.

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 conductor 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 lead wire 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 may include a plurality of spaced conductors, and the plurality of spaced conductors may have different lengths.

The second slit structure may include a plurality of spaced conductive lines, and the plurality of spaced conductive lines may have different lengths.

8, the coil lengths of the third coil 803 disposed at the center and the first coil 801 and the second coil 802 disposed at the side may be different, The inductance value of the transmission coil disposed in the transmission coil may be different.

It is possible to optimize the electromagnetic wave interference shielding effect by making the inductance value, the shape, and the length different from each other in consideration of the different inductance values of the coils.

The electromagnetic wave interference shielding effect can be optimized by varying the inductance value, shape, and length of the first pattern region and the second pattern region in consideration of the different positional relationship of the coils.

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

The area of the second pattern area may be larger than the 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.

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 line 503 having a loop shape . The actual NFC antenna 540 is disposed at the corresponding area of the second surface 5b corresponding to the NFC antenna area 520 called the NFC antenna area 520 for convenience of explanation Be careful.

However, when a plurality of windings of the NFC antenna 540 are provided, one end 542 and the other end 543 of the NFC antenna 540 are connected to each other through the through hole (through hole or via hole) 530). ≪ / RTI > To this end, some sections 509 of the NFC antenna 540 windings may be designed to be disposed in the NFC antenna area 520 of the first side 5a. Both ends of the section 509 of the NFC antenna 540 winding may be connected to the respective reference numerals 544 and 545 of FIG. 6 through through holes.

The 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 .

Here, the number and position of the connection structures disposed on the first surface 5a for electrically connecting the first conductor 503 and the respective pattern filters may differ depending on the design purpose of the person skilled in the art.

Referring to FIG. 5, the first pattern filter 511 may be connected to the first conductor 503 through the first and second connection structures 504 and 505 and the second connection conductor 540. The current flowing through the first pattern filter 511 through the first and second connection structures 504 and 505 and the second connection conductor 540-1 can be evenly distributed to the respective slits.

The second pattern filter 512 may be connected to the first conductor 503 through the third to fourth connection structures 506 and 507 and the second connection conductor 540-2. The current flowing in the second pattern filter 512 through the third to fourth connection structures 506 and 507 and the second connection conductor 540-2 can be evenly distributed to the respective slits.

The third pattern filter 513 may be connected to the first lead 503 through the fifth connection structure 508 and the third connection line 550. The current flowing in the third pattern filter 513 through the fifth connection structure 508 and the third connection line 550 can be evenly distributed to the respective slits.

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

The third connecting conductor 550 may have a curved shape. Therefore, the third connecting conductor 550 can be disposed in consideration of the shape and arrangement of the electronic substrate interference filter and the coil module.

The spacing portion 560 may be disposed between the first pattern region and the second pattern region, which are separated from the third pattern region through the third pattern region and the third connection line 550. Each pattern region or pattern filter is divided by the spacing portion 560, and an electromagnetic interference filter optimized according to the coil shape can be formed.

The arrangement 900 of spacing portions 560 that form the boundaries of the different patterns is shown in detail in FIG.

One end and the other end of the first lead wire 503 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 the ground.

The 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 illustrating a structure of a second surface of an antenna substrate according to an embodiment of the present invention.

Referring to FIG. 6, a loop-shaped NFC antenna 540 may be disposed on the second surface 5b of the antenna substrate 500. The 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, two turns may be arranged to cross each other in a certain section, as shown in FIG.

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

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

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

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

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

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

Each terminal included in the connection terminal 530 can be electrically connected to the corresponding terminal provided on the control circuit board 450.

As shown 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 lead wire 503, respectively. The first terminal 511 and the second terminal 512 may both be connected to a ground terminal provided on 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, have.

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, when the Differential Manchester encoding scheme is applied to the NFC communication However, the present invention is not limited to this, and it may be connected in reverse.

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

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

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

8, the transmission coil assembly 800 includes a first coil 801, a second coil 802, a third coil 803, a substrate 810, a receiving portion 820, and a connection terminal 830, As shown in FIG.

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

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 the first coil 801 and the second coil 802 are disposed on the first coil 801 and the second coil 802, Three coils 803 may be disposed.

At this time, the third coil 803 may be arranged such that a portion of the first coil 801 and the second coil 802 overlap. The first coil 801 and the second coil 802 disposed on both sides of the third coil 803 and the third coil 803 disposed on the substrate 810 are spaced apart from each other Can be different.

That is, a step may be formed between the third coil 803 and the first coil 801 and the second coil 802. 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 to be different from each other in order to compensate the coupling characteristic according to the step difference.

In this case, the impedance characteristic of the third coil 803 and the impedance characteristic 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 characteristic And the high frequency characteristics of the first coil 801 and the second coil 802 may differ. Therefore, as shown in Fig. 5, the shape of the pattern filter and the direction of the slit can be designed to be different from each other at the center and the side.

8, the receiving portion 820 may be plastic injection molded to accommodate the transmitting coil, but this is merely an example, and the substrate 810 and the receiving portion 820 may be integrated into one Or may be injection molded in the form of a sanderst block. A receiving groove for receiving the connection terminal 830 may be included at one side of the sandust block.

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

A wireless charging device according to an embodiment includes a coil assembly; A first substrate disposed on the coil assembly; An electromagnetic interference filter disposed on a first side of the first substrate; And a wireless communication antenna disposed on a second side 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, . ≪ / RTI >

The coil assembly according to the embodiment 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 a plurality of different pattern regions disposed on the second coil 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 an embodiment may include a first conductor disposed in a loop shape on the second surface.

The first pattern region may be connected through a first connection structure located on both side regions of the first conductive line and the second pattern region may be connected through a second connection structure located in a central region of the first conductive line .

The first connection structure according to the embodiment may be plural.

The first pattern region may include a second connection line connected to the first connection structure and the second pattern region may include a third connection line connected to the second connection structure, The conductor may have a smaller width than the first conductor or the second conductor.

The first pattern region according to an embodiment may include a first slit structure disposed in a first direction at the second connection conductor, and the second pattern region may include a second slit structure disposed at a second direction Slit structure.

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

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

The first pattern region may be disposed apart from the first coil or the second coil, and the second pattern region may be disposed in contact with the third coil.

The first pattern region and the second pattern region may have inductance values different from each other.

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

The second pattern region may be larger than the area where the third coil is disposed.

The areas of the first pattern area and the second pattern area may be different from each other.

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

The second pattern region according to an embodiment may be disposed between the two first pattern regions.

The spacing portion may be disposed between the first pattern region and the second pattern region according to the embodiment.

The second connection wire according to the embodiment may have a straight shape and the third connection wire may have a curved shape.

The first slit structure may include a plurality of spaced conductors, and the plurality of spaced conductors may have different lengths.

The second slit structure may include a plurality of spaced conductors, and the plurality of spaced conductors 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 on which an electromagnetic interference filter according to the prior art is mounted.

10, the conventional electromagnetic interference filter 1010 has a structure in which the electromagnetic interference filter 1010 is formed of a plurality of electromagnetic interference filters 1010, regardless of the arrangement of the coils disposed in the coil assembly and the height difference from the bottom surface of the substrate constituting the coil assembly. All of the slits 1011 are arranged in the same direction.

Here, the height difference of the coils may be generated when the third coil 803 is arranged so that the first coil 801 and the second coil 802 partially overlap with each other, as described above with reference to FIG. 8 .

The first coil 801 and the second coil 802 disposed on both sides of the lower end of the third coil 803 and the third coil 803 disposed at the upper end of the substrate 810 are The impedance characteristic and the high-frequency characteristic of the antenna can be changed.

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

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

11, the conventional electromagnetic interference filter in which the coil arrangement type and the step difference are not taken into consideration, the EMI shielding performance to the AM frequency band satisfies the peak reference value PK 1211, but the average reference value AV, 1212) is not satisfied. If the measurement value is smaller than the reference value, it is determined that the EMI shielding performance in the corresponding frequency band satisfies the reference value. If 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.

11, it can be seen that not only the average reference value (AV) 1222 but also the peak reference value PK (1221) are not satisfied in the FM frequency band of the electromagnetic interference filter of FIG.

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

Reference numerals 1210 and 1220 in FIG. 12 show patterns of changes in the peak value and the average value of the electromagnetic waves measured in the AM frequency band and the FM frequency band, respectively.

11, the electromagnetic interference filter to which the direction and the pattern of the slit are applied in consideration of the coil arrangement type and the step difference has a peak reference value PK 1111 and an average reference value AV 1112 in the AM frequency band, Are all satisfied.

12, the electromagnetic interference filter disclosed in FIG. 5 can detect that both the average reference value (AV) 1122 and the peak reference value (PK) 1121 are satisfied in the FM frequency band .

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

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

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

Claims (21)

Coil assembly;
A first substrate disposed on the coil assembly;
An electromagnetic interference filter disposed on a first side of the first substrate; And
A wireless communication antenna disposed on a second side of the first substrate
Lt; / RTI >
Wherein the coil assembly includes a plurality of coils,
Wherein the electromagnetic interference filter includes a plurality of different pattern regions corresponding to the plurality of coils. The method according to claim 1,
The coil assembly includes:
A first coil, a second coil, and a third coil,
Wherein 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,
Wherein the plurality of different pattern regions are formed by patterning,
A first pattern area corresponding to the first coil or the second coil, and a second pattern area corresponding to the third coil. 3. The method of claim 2,
Wherein the electromagnetic interference filter comprises a first conductor disposed in a loop on the second surface. The method of claim 3,
Wherein the first pattern region is connected through a first connection structure located at both side regions of the first conductor,
Wherein the second pattern region is connected through a second connection structure located in a central region of the first conductor. 5. The method of claim 4,
And the first connection structure is plural. 5. The method of claim 4,
Wherein the first pattern region includes a second connection conductor connected to the first connection structure,
Wherein the second pattern region includes a third connection conductor connected to the second connection structure
Wherein the third connecting conductor is smaller in width than the first conductor or the second connecting conductor. The method according to claim 6,
Wherein the first pattern region includes a first slit structure disposed in a first direction in the second connection conductor,
And wherein the second pattern region comprises a second slit structure disposed in a second direction at the third connecting conductor. 8. The method of claim 7,
Wherein the first direction and the second direction are different. 8. The method of claim 7,
Wherein the first direction and the second direction are orthogonal to each other. 3. The method of claim 2,
Wherein the first pattern region is disposed apart from the first coil or the second coil,
And the second pattern region is disposed in contact with the third coil. 3. The method of claim 2,
Wherein the first pattern region and the second pattern region have different inductance values. 3. The method of claim 2,
Wherein the first pattern area is smaller than the area where the first coil or the second coil is disposed. 3. The method of claim 2,
Wherein the second pattern area is larger than the area where the third coil is disposed. 3. The method of claim 2,
Wherein the first pattern area and the second pattern area have different areas. 3. The method of claim 2,
Wherein the first pattern area and the second pattern area have different shapes. 3. The method of claim 2,
And the second pattern region is disposed between the first pattern regions corresponding to the first coil and the second coil, respectively. 3. The method of claim 2,
And a spacing portion is disposed between the first pattern region and the second pattern region. The method according to claim 6,
The second connecting conductor has a straight shape,
And the third connecting conductor has a curved shape. 8. The method of claim 7,
Wherein the first slit structure comprises a plurality of spaced conductors,
Wherein the plurality of spaced conductors are different in length. 8. The method of claim 7,
Wherein the second slit structure comprises a plurality of spaced conductors,
Wherein the plurality of spaced conductors are different in length. 5. The method of claim 4,
Wherein the width of the first connection structure is smaller than the width of the second connection structure.

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