KR20190038972A - Wireless charging coil, manufacturing method thereof and wireless charging apparatus having the same - Google Patents

Abstract

A wireless charging coil comprises: a first film having a plurality of via holes; a first coil unit arranged on a first surface of the first film; a second coil unit arranged on a second surface of the first film; a connection unit arranged in the plurality of via holes to electrically connect the first and second coil units; and a first extended line extended from one end inside the coil unit and overlapped with the second coil unit. The first and second coil units include at least one conductive layer and further include: a first conductive layer; a second conductive layer; and a third conductive layer surrounding the second conductive layer.

Description

Technical Field [0001] The present invention relates to a wireless charging coil, a manufacturing method thereof, and a wireless charging device having the same,

The present invention relates to a wireless charging coil, a manufacturing method thereof, and a wireless charging apparatus having the same.

Portable terminals, such as mobile phones and laptops, include a battery for storing power and a circuit for charging and discharging the battery. In order for the battery of such a terminal to be charged, power must be supplied from an external charger.

2. Description of the Related Art [0002] Generally, as an example of an electrical connection between a charging device and a battery for charging electric power of a battery, a commercial electric power is supplied to a terminal for converting electric power into voltage and current corresponding to the battery, Supply method. This type of terminal supply is accompanied by the use of physical cables or wires. Therefore, when handling a lot of terminal-supplied equipment, many cables occupy considerable work space, are difficult to organize, and are not well apparent. Also, the terminal supply method may cause problems such as instantaneous discharge due to different potential difference between terminals, burnout due to foreign substances, fire, natural discharge, battery life and deterioration of performance.

In order to solve such a problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly are proposed. In addition, since the wireless charging system has not been installed in some portable terminals in the past and the consumer has to purchase a separate wireless charging receiver accessory, the demand for the wireless charging system is low, but the wireless charging user is expected to increase rapidly. Wireless charging function is expected to be equipped basically.

Generally, a wireless charging system comprises a wireless power transmitter for supplying electric energy in a wireless power transmission mode and a wireless power receiver for receiving electric energy supplied from a wireless power transmitter to charge the battery.

The conventional wireless charging coil is formed in the form of an FPCB type and attached to a shielding material.

Typically, the coil factors that determine the charging efficiency of the wireless charging are the inductance L, the resistance R, and Q.

Since the FPCB type coil has a design autocircuit and a plating type, the L value and the R (resistance) characteristics are good, and the inductance and the capacitance value can be secured easily, and the Q value characteristic is also good.

However, the conventional wireless charging coil has a disadvantage of high product cost due to expensive material cost and processing cost.

Accordingly, a new coil for replacing the conventional wireless charging coil is required.

On the other hand, among types of conventional wireless charging coils, a type formed by pressing a copper plate has been studied due to a low material cost. However, since a separate contact terminal must be manufactured and connected to a coil in the form of a product, There arises a problem that the material cost is also increased.

The embodiment provides a wireless charging coil of a new structure.

The embodiment provides a method of manufacturing a wireless charging coil in which the process is simple and the material cost is reduced.

The embodiment provides a wireless charging device having the wireless charging coil.

A wireless charging coil according to an embodiment includes: a first film having a plurality of via holes; A first coil portion disposed on a first side of the first film; A second coil portion disposed on a second side of the first film; A connection portion disposed in the plurality of via holes to electrically connect the first coil portion and the second coil portion; And a first extension line extending from an inner end of the first coil section and overlapping the second coil section. The first and second coil portions may include at least one conductive layer. Each of the first and second coil portions may include a first conductive layer, a second conductive layer surrounding the second conductive layer, and a third conductive layer surrounding the second conductive layer.

A method of manufacturing a wireless charging coil according to an embodiment includes: providing a first film having a plurality of via holes; Forming a first conductive layer on the first and second sides of the first film, the first conductive layer being spaced apart from each other by a plurality of turns using a printing process; Forming a second conductive layer surrounding the first conductive layer using a first plating process; Forming a third conductive layer surrounding the second conductive layer using a second plating process; And forming a connection portion in the via hole. The first coil portion may be formed by the first to third conductive layers formed on the first surface of the first film. The second coil portion may be formed by the first to third conductive layers formed on the second surface of the first film. The connection portion may be formed simultaneously with one of the first to third conductive layers.

A wireless charging apparatus according to an embodiment includes: a printed circuit board; A plurality of wireless charging coils disposed on the printed circuit board; And a shielding material disposed between the printed circuit board and the wireless charging coil.

According to the embodiment, the contact pads connected to the extension lines and extension lines are manufactured at the same time when the coil is manufactured, so that the processing time can be shortened and the process material cost can be reduced.

According to the embodiment, since the printing process as well as the plating process is performed to form the coil portion, the limitation on the thickness expansion by the plating process can be supplemented by the printing process to easily secure the desired thickness.

According to the embodiment, the first and second coil portions are formed on the upper and lower surfaces of the film, respectively, and the first and second coil portions are electrically connected through the via hole formed in the film, thereby remarkably improving the wireless charging efficiency .

1 is a block diagram illustrating a wireless charging system in accordance with an embodiment.
2 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.
3 is a block diagram illustrating the structure of a wireless power receiver in conjunction with the wireless power transmitter of FIG.
4 is an exploded perspective view of a wireless power transmitter according to an embodiment.
5 shows a wireless power receiver according to an embodiment.
6 is a plan view showing a wireless charging coil according to an embodiment.
7 is a rear view showing a wireless charging coil according to an embodiment.
8 is a cross-sectional view taken along line H-H 'in FIG.
9 is a cross-sectional view taken along the line I-I 'in FIG.
10 is a view for explaining a process for manufacturing a wireless charging coil according to the embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which the embodiments 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.

The present invention is not necessarily limited to these embodiments, as long as all of the constituent elements of the embodiment are described as being combined or operated together. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program may be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing embodiments. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Lower) "and" front or rear "encompass both that the two components are in direct contact with each other or that one or more other components are disposed between the two components.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power charging system includes a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a wireless power transmitter, And a wireless charging device are used in combination. In addition, a wireless power receiving device, a wireless power receiver, a receiving terminal, a receiving side, a receiving device, a receiver terminal, and the like may be used in combination for the sake of convenience of description in the expression for a device for receiving wireless power from a wireless power transmission device.

The wireless charging device according to the embodiment may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, And may transmit power to the wireless power receiving device.

As an example, a wireless power transmitter can be used not only on a desk, on a table, etc., but also for an automobile and used in a vehicle. A wireless power transmitter installed in a vehicle can be provided in a form of a stand that can be easily and stably fixed and mounted.

A mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, an MP3 player, (Hereinafter referred to as a " device ") capable of charging a battery by mounting a wireless power receiver according to an embodiment of the present invention without limitation to a toothbrush, an electronic tag, a lighting device, a remote control, ), And the term terminal or device may be used in combination. A wireless power receiver according to another embodiment may also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.

A wireless power receiver according to an embodiment may include at least one wireless power transmission scheme and may receive wireless power from two or more wireless power transmitters at the same time. Here, the wireless power transmission scheme may include at least one of an electromagnetic induction scheme, an electromagnetic resonance scheme, and an RF wireless power transmission scheme. In particular, wireless power receivers supporting electromagnetic induction can include electromagnetic induction wireless charging technology as defined in the Wireless Power Consortium (WPC) and the Air Fuel Alliance (formerly Power Matters Alliance) have. In addition, a wireless power receiver supporting electromagnetic resonance may include a resonant wireless charging technique defined in the Air Fuel Alliance (formerly Alliance for Wireless Power) standard instrument, a wireless charging technology standard organization.

Generally, a wireless power transmitter and a wireless power receiver that constitute a wireless charging system can exchange control signals or information through in-band communication or BLE (Bluetooth Low Energy) communication. Here, the in-band communication and the BLE communication can be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, and the like. For example, the wireless power receiver may transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching on / off the current induced through the receiving coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various status information including received power intensity information. At this time, the wireless power transmitter can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.

1 is a block diagram illustrating a wireless charging system in accordance with an embodiment.

Referring to FIG. 1, a wireless charging system according to an embodiment of the present invention includes a wireless power transmitter 10 that wirelessly transmits power, a wireless power receiver 20 that receives transmitted power, and an electronic device 30).

For example, the wireless power transmitter 10 and the wireless power receiver 20 may 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 transmitter 10 and the wireless power receiver 20 may use out-of-band communication to exchange information using a separate frequency band that is different from the operating frequency used for wireless power transmission .

As an example, the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transceivers 10 and 20 will become more apparent through the description of embodiments to be described later.

In-band communication and out-of-band communication may provide bidirectional communication, but are not limited thereto, and in other embodiments, may provide unidirectional communication or half duplex communication.

 In one example, the unidirectional communication may be that the wireless power receiver 20 only transmits information to the wireless power transmitter 10, but the wireless power transmitter 10 is not limited to this, Lt; / RTI >

The half-duplex communication mode is a communication mode in which bidirectional communication is possible between the wireless power receiver 20 and the wireless power transmitter 10, but is set to enable information transmission by only one device at any one time.

The wireless power receiver 20 according to the embodiment 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.

2 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.

2, the wireless power transmitter 200 includes a power conversion unit 210, a power transmission unit 220, a wireless charging communication unit 230, a control unit 240, a sensing unit 250, a local communication unit 270 and a wireless communication coil 280. It should be noted that the above-described configuration of the wireless power transmitter 200 is not necessarily an essential configuration, but may be configured to include more or fewer components.

As shown in FIG. 2, when power is supplied from the power supply unit 260, the power conversion unit 210 may convert the power to a predetermined intensity.

For this, the power conversion unit 210 may include a DC / DC converter 211 and an amplifier 212.

The DC / DC converting unit 211 may convert the DC power supplied from the power supply unit 260 into a DC power having a specific intensity according to a control signal of the controller 240.

At this time, the sensing unit 250 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the control unit 240. For example, the control unit 240 may adaptively cut off the power supply from the power supply unit 250 or block the power supply to the amplifier 212 based on the voltage / current value measured by the sensing unit 250 . The sensing unit 250 may measure the internal temperature of the wireless power transmitter 200 and may provide the measurement result to the controller 240 in order to determine whether overheating occurs. More specifically, the sensing unit 250 may include one or more temperature sensors. One or more temperature sensors may measure the temperature of the transmit coil of the power transfer section 220. For example, the control unit 240 can adaptively cut off the power supply from the power supply unit 250 or block the power supply to the amplifier 212 based on the temperature value measured by the sensing unit 250 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 210 to cut off power supplied from the power supply unit 250 or to cut off power supplied to the amplifier 212. Alternatively, the control unit 240 may adjust the intensity of the power supplied to the power transfer unit 220 based on the temperature value measured by the sensing unit 250. Accordingly, the wireless power transmitter 200 according to the embodiment can prevent the internal circuit from being damaged due to overheating.

The amplifier 212 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 240. For example, the control unit 240 may receive the power reception status information and / or the power control signal of the wireless power receiver (300 of FIG. 3) through the wireless charging communication unit 230 and may receive the received power reception status information or The amplification factor of the amplifier 212 can be dynamically adjusted based on the power control signal. For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmission unit 220 may be configured to include a multiplexer 221 (or a multiplexer), a wireless charging coil module 222 for controlling the output power of the amplifier 212 to be transmitted to the transmission coil. The wireless charging coil module 222 may include first to nth transmission coils. The power transmission unit 220 may also include a carrier generator (not shown) for generating a specific operating frequency for power transmission .

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 212 transmitted through the multiplexer 221 to AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer 221 to generate AC power. However, this is merely one embodiment, It should be noted that they may be mixed only or later.

The controller 240 according to the embodiment may transmit power through time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected. For example, if the wireless power transmitter 200 has three wireless power receivers-i. E., The first through third wireless power receivers, respectively, identified through three different transmit coils, i. E. First through third transmit coils , The control unit 240 controls the multiplexer 221 so that power can be transmitted through a specific transmission coil in a specific time slot. At this time, the amount of power transmitted to the corresponding wireless power receiver can be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. The amplification rate of the amplifier 212 of the wireless power receiver may be controlled to control the transmission power of each wireless power receiver.

The control unit 240 may control the multiplexer 221 so that the detection signals may be sequentially transmitted through the first through n'th transmit coils 222 during the first differential sense signal transmission procedure. At this time, the control unit 240 can identify the time at which the detection signal is transmitted using the timer 255. When the detection signal transmission time comes, the control unit 240 controls the multiplexer 221 so that the detection signal is transmitted through the corresponding transmission coil It can be controlled to be transmitted. For example, the timer 255 may transmit a specific event signal to the control unit 240 at a predetermined period during the ping transmission step. When the event signal is detected, the control unit 240 controls the multiplexer 221 It is possible to control the digital ping to be transmitted through the transmission coil.

In addition, the control unit 240 transmits a transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) received through the transmission coil from the demodulation unit 232 during the first detection signal transmission procedure, And receive the received signal strength indicator. In the second sensing signal sending process, the controller 240 controls the multiplexer 221 so that the signal strength indicator can be transmitted only through the transmitting coil (s) You may. In another example, when there are a plurality of transmit coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 240 transmits the transmit coil, which receives the signal strength indicator having the largest value, In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 221 may be controlled according to the determination result.

The modulator 231 may modulate the control signal generated by the controller 240 and transmit the modulated control signal to the multiplexer 221. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 232 can demodulate the detected signal and transmit the demodulated signal to the controller 240 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

The demodulation unit 232 may identify which demodulated signal is received from which transmission coil, and may provide the control unit 240 with a transmission coil identifier corresponding to the identified transmission coil.

In one example, the wireless power transmitter 200 may acquire a signal strength indicator through in-band communication that communicates with a wireless power receiver using the same frequency used for wireless power transmission.

In addition, the wireless power transmitter 200 can transmit wireless power using the transmit coil 222, as well as exchange various information with the wireless power receiver through the transmit coil 222. [ In another example, the wireless power transmitter 200 may further include a separate coil corresponding to each of the transmit coil 222 (i.e., first to n < th > transmit coils) It should be noted that it may also perform in-band communication with the receiver.

In addition, the wireless power transmitter 200 may include a short range communication unit 270. The short-range communication unit 270 may perform short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission. For example, the short-range bidirectional communication may be an NFC (Near Field Communication) method. NFC is one of Radio Frequency IDentification (RFID) technologies and it is a wireless communication technology that transmits various wireless data within a distance of 10cm or less using a frequency of 13.56MHz.

In addition, the wireless power transmitter 200 may include a wireless communication coil 280 that transmits and receives signals for use in short-distance bidirectional communication with a wireless power receiver.

3 is a block diagram illustrating the structure of a wireless power receiver in conjunction with the wireless power transmitter of FIG.

3, the wireless power receiver 300 includes a wireless charging coil module 310, a rectifier 320, a DC / DC converter 330, a load 340, a sensing unit 350, A wireless charging communication unit 360, a main control unit 370, a short range communication unit 380, and a wireless communication coil 390. Here, the wireless charging communication unit 360 may include at least one of a demodulation unit 361 and a modulation unit 362.

In addition, the wireless power receiver 300 may include a short range communication unit 380. The short-range communication unit 380 can perform short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission. For example, the short-range bidirectional communication may be an NFC (Near Field Communication) method. NFC is one of Radio Frequency IDentification (RFID) technologies and it is a wireless communication technology that transmits various wireless data within a distance of 10cm or less using a frequency of 13.56MHz.

In addition, the wireless power receiver 300 may include a wireless communication coil 390 that transmits and receives signals for use in short-distance bidirectional communication with the wireless power transmitter 200.

The AC power received through the wireless charging coil module 310 may be transmitted to the rectifier 320. The rectifier 320 may convert the AC power to DC power and transmit it to the DC / DC converter 330. The DC / DC converter 330 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 340 and then deliver it to the load 340. Also, the wireless charging coil module 310 may include a plurality of reception coils (not shown), that is, first to n-th reception coils. The frequency of the AC power transmitted to each of the reception coils (not shown) according to an embodiment may be different from each other. In another embodiment, a frequency controller having a function of controlling LC resonance characteristics for different reception coils The resonance frequencies of the respective reception coils can be set differently.

The sensing unit 350 may measure the intensity of the DC power output from the rectifier 320 and may provide the measured DC power to the main control unit 370. Also, the sensing unit 350 may measure the intensity of the current applied to the receiving coil 310 according to the wireless power reception, and may transmit the measurement result to the main control unit 370. For example, the main controller 370 may compare the measured rectifier output DC power with a preset reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage occurs, a packet indicating that an overvoltage has occurred can be generated and transmitted to the modulator 362. Here, the signal modulated by the modulating unit 362 may be transmitted to the wireless power transmitter 200 through the receiving coil 310 or a separate coil (not shown). The main controller 370 may determine that the sensing signal is received when the intensity of the rectifier output DC power is equal to or greater than the reference value. When receiving the sensing signal, the signal strength indicator corresponding to the sensing signal is received by the modulator 362, To be transmitted to the wireless power transmitter 200 via the wireless network. The demodulation unit 361 demodulates the AC power signal between the reception coil 310 and the rectifier 320 or the DC power signal output from the rectifier 320 to identify whether or not the detection signal is received, (370). At this time, the main control unit 370 can control the signal strength indicator corresponding to the detection signal to be transmitted through the modulator 362. [ Also, the sensing unit 350 may measure the internal temperature of the wireless power receiver 300 and provide the measured temperature value to the main control unit 370. More specifically, the sensing unit 350 may include one or more temperature sensors. One or more temperature sensors may measure the temperature of the receiving coil of the charging coil module 310. For example, the main control unit 370 may determine whether overheating occurs by comparing the measured internal temperature with a reference value. As a result of the determination, if overheating occurs, a packet indicating that overheating has occurred can be generated and transmitted to the modulating unit 362. [ Here, the signal modulated by the modulating unit 362 may be transmitted to the wireless power transmitter 200 through the receiving coil 310 or a separate coil (not shown).

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

The wireless power transmitter according to an embodiment may be the wireless power transmitter 10 shown in FIG. 1 or the wireless power transmitter 200 shown in FIG.

4, the wireless charging apparatus according to the embodiment includes a first bracket 400, a first substrate 500, a second bracket 600, a shielding material 605, a wireless charging coil 610, (700). It should be noted that the configuration of the above-described wireless charging device is not necessarily an essential configuration, but may be configured to include more or fewer components.

The first and second substrates 500 and 700 may be a printed circuit board (PCB) or a flexible printed circuit board (FPCB), but the present invention is not limited thereto.

The first bracket 400 may be fastened to the second bracket 600. That is, the first bracket 400 and the second bracket 600 can be fastened using a bolt such as a screw.

The first substrate 500 may be positioned on the first bracket 400. The first substrate 500 may be fastened to the first bracket 400 and / or the second bracket 600. For example, a screw may be fastened to the second bracket 600 through the first bracket 400 and the first substrate 500.

The first substrate 500 may be mounted on the lower surface thereof with various kinds of circuit parts for driving or controlling the wireless charging coil 610. For example, the circuit unit includes the multiplexer 221, the wireless charging communication unit 230, the timer 255, the sensing unit 250, and the control unit 240 shown in FIG. 2, and the wireless charging communication unit 360, a main control unit 370, and a sensing unit 350. However, the present invention is not limited thereto.

The first substrate 500 may have a rigid rectangular shape, but the present invention is not limited thereto. Accordingly, the first substrate 500 can support the shielding member 605, the wireless charging coil 610, and the like disposed on the upper surface. The area of the first substrate 500 may be larger than the area of the wireless charging coil 610 and the area of the shielding material 605. A terminal portion 660 may be formed on one side of the first substrate 500. The circuit portion of the first substrate 500 can be electrically connected to the wireless charging coil 610 and the circuit portion of the second substrate 700 using the terminal portion. The terminal portion may be composed of a plurality of pins or pads, but the present invention is not limited thereto.

The shielding member 605 may be disposed on the upper surface of the first substrate 500.

Specifically, the shielding member 605 may be disposed on the upper surface of the first substrate 500 in the opening 601 of the second substrate 700. As another example, the shielding material 605 may be disposed below the second substrate 700 and above the first substrate 500. In this case, the area of the shielding material 605 may be larger than the area of the opening 601 of the second substrate 700. Therefore, the edge region of the shielding material 605 can overlap with the frame 603 of the second substrate 700. [ As another example, the shielding member 605 may be disposed on the upper portion of the second substrate 700. In this case, the area of the shielding material 605 may be larger than the area of the opening 601 of the second substrate 700. Therefore, the edge region of the shielding material 605 can overlap with the frame 603 of the second substrate 700. [

In order to sufficiently shield the magnetic field of the wireless charging coil 610, the area of the shield 605 may be larger than the area of the wireless charging coil 610.

A wireless charging coil 610 may be disposed on the shielding member 605. The wireless charging coil 610 may include one or more wireless charging coils 620-640. The one or more wireless charging coils 620-640 may be one or more transmit coils of the wireless power transmitter or one or more receive coils of the wireless power receiver. Further, when there are a plurality of wireless charging coils 610, each of the wireless charging coils 620 to 640 may be wound with the same number of turns. However, the present invention is not limited to this, and may be wound in different numbers of turns. Further, the plurality of wireless charging coils 620 to 640 may have the same inductance. However, the present invention is not limited thereto and different inductances may be provided. In addition, the plurality of wireless charging coils 620 to 640 may be arranged in one or more layers. More specifically, the plurality of wireless charging coils 620 to 640 may include first to third wireless charging coils 620 to 640. The second wireless charging coil 630 and the third wireless charging coil 640 may be arranged in parallel to each other in the same layer, that is, the first layer. In this case, the first wireless charging coil 620 may be disposed in a second layer that is different from the first layer. For example, some areas of the first wireless charging coil 620 may overlap some areas of the second wireless charging coil 630 and other areas may overlap to overlap some areas of the third wireless charging coil 640, It is not limited thereto.

As described above, the plurality of wireless charging coils 620 to 640 can be arranged in different layers to expand the charging area so that wireless power can be efficiently transmitted. In particular, the first wireless charging coil 620 may be disposed in the same layer as the substrate 400.

The wireless charging coil 610 may be coated with an insulating material on the outer surface or coated with an insulating layer.

The area of the shielding member 605 may be larger than the occupied area of the first to third wireless charging coils 620 to 640. The batch occupied area may be a total area occupied by the first to third wireless charging coils 620 to 640. Therefore, the electromagnetic field generated by the first to third wireless charging coils 620 to 640 may be shielded by the shielding material 605, and may not affect the circuit unit mounted on the first substrate 500 or the outside.

The shielding member 605 may be disposed on the lower surface of the wireless charging coil 610. The upper surface of the shielding member 605 may contact the lower surface of the wireless charging coil 610, specifically, the lower surfaces of the second and third wireless charging coils 630 and 640, but this is not limited thereto.

For example, an adhesive or an adhesive member (not shown) is disposed between the upper surface of the shielding material 605 and the lower surfaces of the second and third wireless charging coils 630 and 640 to shield the second and third wireless charging coils 630 and 640, (630, 640) may be fixed. The shielding member 605 can guide the wireless power generated in the wireless charging coil 610 disposed in the upper portion in the charging direction and protect various circuit parts mounted on the lower portion of the first substrate 500 from the electromagnetic field.

A second substrate 700 may be disposed on the wireless charging coil 610 or the second bracket 600. The second substrate 700 may be fastened to the second bracket 600 using bolts such as screws.

For example, when the second and third wireless charging coils 630 and 640 in which the wireless charging coil 610 is disposed in the first layer and the first wireless charging coil 620 are disposed in the second layer on the first layer , The total thickness of the first layer and the second layer may be greater than the thickness of the second bracket 600. To this end, some regions of both ends of the second bracket 600 may have first and second protrusions 602 and 604 projecting upwardly. Accordingly, the second substrate 700 is fastened to the first and second protrusions protruding from both ends of the second bracket 600, so that at least the upper surface of the first wireless charging coil 620 is located on the lower surface of the second substrate 700 So that damage to the first wireless charging coil 620 due to contact with the lower surface of the second substrate 700 can be prevented.

A circuit portion such as the short-range communication units 270 and 380 shown in FIG. 2 or 3 may be mounted on the upper surface of the second substrate 700, for example. In addition, the wireless communication coils 280 and 390 may be disposed on the upper surface of the second substrate 700 in a pattern. The wireless communication coils 280 and 390 may have at least one turn number. Although not shown, both ends of the wireless communication coils 280 and 390 can be electrically connected to circuit portions such as the short-range communication units 270 and 380 via via-holes. The circuit portion of the second substrate 700 may be electrically connected to a control portion (240 in Fig. 2) or a main control portion (370 in Fig. 3) mounted on the first substrate 500 using a cable or a bus line .

On the other hand, in the above description, the wireless charging coil 50 has been described as a transmission coil to be mounted in a wireless power transmitter (10 in Fig. 1, 200 in Fig. 2).

However, the embodiment of the wireless charging coil 50 may be employed as a receiving coil mounted in a wireless power receiver (20 in Figure 1, 300 in Figure 3).

5 shows a wireless power receiver according to an embodiment.

The wireless power receiver according to an embodiment may be the wireless power receiver shown in FIG. 1 or the wireless power receiver 300 shown in FIG. The wireless power receiver shown in FIG. 5 may be referred to as a multi-mode antenna module.

5, a wireless power receiver 300 according to an embodiment includes a printed circuit board 360, a first antenna 310, a second antenna 320, a third antenna 330, a first connection terminal 340 and a second connection terminal 350. [ Here, (310) may be a wireless charging coil of the embodiment.

In detail, the wireless power receiver 300 according to the embodiment includes a printed circuit board 360, a first antenna 310 that is pattern-printed and disposed in a central area of the printed circuit board 360 for wireless charging, A second antenna 320 disposed in a pattern printed on the outer periphery of the first antenna 310 for wireless communication and an outer periphery of the second antenna 320 so as not to be overlapped with the second antenna 320 for the second short- A first connection terminal 340 for connecting both ends of the first connection pattern corresponding to the first antenna 310 and a second connection terminal 340 corresponding to the second antenna 320 and the third connection terminal 340, And a second connection terminal 350 for connecting both ends of the second to third connection patterns corresponding to the antenna 330, respectively.

Here, the first connection terminal 340 and the second connection terminal 350 may be physically separated from the printed circuit board 350. The first connection terminal 340 and the second connection terminal 350 may be physically and electrically connected to the printed circuit board 360 such that the first connection pattern does not overlap the second antenna 320 and the third antenna 330. [ And can be separately arranged.

The connection pattern of each antenna may be formed of a lead wire extending from both ends of the antenna, or may be branched at a specific position of the antenna. Here, the connection patterns of the respective antennas and the positions at which the connection terminals are disposed may be arranged such that the length of the connection pattern is minimized.

For example, the first local area wireless communication may be Magnetic Secure Transmission (MST) and the second local area wireless communication may be Near Field Communication (NFC). Here, the MST operates in the 3.24 MHz band and the NFC operates in the 13.56 MHz band.

As another example, the first short range wireless communication may be Near Field Communication (NFC) and the second short range wireless communication may be Magnetic Secure Transmission (MST).

As another example, the first short range wireless communication and the second short range wireless communication correspond to any one of NFC, RFID communication, Bluetooth communication, UWB (Ultra Wideband) communication, MST communication, Apple Pay communication and Google Pay communication .

A pattern of the corresponding antenna may be disposed on the printed circuit board 360 such that a separation distance between the second antenna 320 and the third antenna 330 is maintained at least 1 mm or more. The second antenna 320 and the third antenna 330 may be mounted on the printed circuit board 300 so that the deviation from the separation distance between the second antenna 320 and the third antenna 330 is maintained below a predetermined first reference value, 360, respectively.

A pattern of the corresponding antenna may be disposed on the printed circuit board 360 so that a separation distance between the first antenna 310 and the second antenna 320 is maintained at least 0.5 mm or more. The first antenna 310 and the second antenna 320 may be mounted on a printed circuit board (not shown) so that the deviation of the distance between the first antenna 310 and the second antenna 320 is maintained below a predetermined second reference value. 360, respectively.

For example, the first antenna 310 may be pattern printed on both sides of the printed circuit board 360, and patterns printed on both sides through through holes (not shown) Can be conducted. Through this, the resistance component of the first antenna can be reduced, and the reception sensitivity of the antenna can be improved accordingly.

In another example, the second antenna 320 may be pattern printed on both sides of the printed circuit board 360, and a pattern printed on both sides through a through hole (not shown) disposed on the printed circuit board 360 They can be interconnected. Thus, the resistance component of the second antenna can be reduced, and thus the receiving sensitivity of the antenna can be improved.

In another example, the third antenna 330 may be pattern printed on both sides of the printed circuit board 360, and may be pattern printed on both sides through a through hole (not shown) disposed on the printed circuit board 360 Can be interconnected. Thus, the resistance component of the third antenna can be reduced, and the receiving sensitivity of the antenna can be improved accordingly.

In another example, at least one of the first antenna 310, the second antenna 320, and the third antenna 330 may be pattern-printed on both sides of the printed circuit board 360, The corresponding antenna patterns printed on both sides through the through holes (not shown) arranged in the antenna 360 can be conducted to each other. Through this, the resistance component of the antenna can be reduced, and the receiving sensitivity of the antenna can be improved accordingly.

3, the first antenna 310 may be printed on the printed circuit board 360 in a circular pattern having a predetermined inner diameter, and the first connection terminal may be disposed outside the inner diameter , Which is only one embodiment.

Hereinafter, the wireless charging coil will be described in detail. The wireless charging coil according to the embodiment may be a transmission coil employed in the wireless power transmitter 10 shown in FIG. 1 or the wireless power transmitter 200 shown in FIG. 2 or the wireless power receiver shown in FIG. 1, Lt; RTI ID = 0.0 > 300 < / RTI >

FIG. 6 is a plan view showing a wireless charging coil according to the embodiment, and FIG. 7 is a rear view illustrating a wireless charging coil according to the embodiment. FIG. 8 is a cross-sectional view taken along the line H-H 'in FIG. 6, and FIG. 9 is a cross-sectional view taken along the line I-I' in FIG.

The wireless charging coil according to the embodiment may be the wireless power receiver shown in FIG. 1 or the receiving coil employed in the wireless power receiver 300 shown in FIG.

6 to 9, the wireless charging coil 50 according to the embodiment may include a first film 61.

The first film 61 is a supporting member for supporting the first and second coil parts 51a and 51b disposed on the lower and upper surfaces of the first film 61 or an insulating member for insulating the first and second coil parts 51a and 51b Or may be an insulating layer. The first film 61 may be formed of a transparent material, but the present invention is not limited thereto.

The first film 61 may be formed of a material having excellent insulation and strength. For example, the first film 61 may be made of a plastic material. The first film 61 may be formed of a thin and flexible material. Specifically, the first film 61 may be polyimide (PI) or polyethylene terephthalate (PET), but the present invention is not limited thereto.

The wireless charging coil 50 according to the embodiment may further include a first coil portion 51a.

The first coil part 51a may be disposed on the lower surface of the first film 61. [ The first coil portion 51a can be in contact with the lower surface of the first film 61.

The first coil portion 51a may include a first coil 52a that is wound multiple times in a spiral manner. The first coil 52a may be disposed apart from each other in a plurality of turns of the wound portion. The first coil portion 51a may further include a first hollow portion 53a formed on the inner side of the first coil 52a. The first coil 52a is not disposed in the first hollow portion 53a. The first hollow portion 53a may have a circular or rectangular shape, but the present invention is not limited thereto.

The first coil portion 51a may further include a first extension line 55 extending from an inner end of the first coil portion 51a adjacent to the first hollow portion 53a. The first extension line 55 can be in contact with the lower surface of the first film 61. The first extension line 55 may extend in a direction intersecting the spirally-wound second coil 52b of the second coil portion 51b.

The first coil 52a may have first and second ends 56a, 56b that are spaced apart from each other. One side of the first extension line 55 is spaced from the first end 56a of the first coil 52a and the other side of the first extension line 55 is spaced apart from the first end 52a of the first coil 52a And can be spaced from the two ends 56b.

The distance between the first extension line 55 and the first end 56a of the first coil 52a may be 0.4 mm to 0.8 mm. Specifically, the distance between the first extension line 55 and the first end 56a of the first coil 52a may be 0.4 mm to 0.6 mm. The first extension line 55 and the first coil 52a may be electrically insulated from each other if the distance between the first extension line 55 and the first end 56a of the first coil 52a is 0.4 mm or more have. When the distance between the first extension line 55 and the first end 56a of the first coil 52a is 0.8 mm or less, the arrangement area of the first coil 52a can be further extended.

The distance between the first extension line 55 and the second end 56b of the first coil 52a may be 0.4 mm to 0.8 mm. Specifically, the distance between the first extension line 55 and the second end 56b of the first coil 52a may be 0.4 mm to 0.6 mm. The gap between the first extension line 55 and the second end 56b of the first coil 52a is 0.4 mm or greater and the gap between the first extension line 55 and the first coil 52a is electrically insulated have. When the distance between the first extension line 55 and the second end 56b of the first coil 52a is 0.8 mm or less, the arrangement area of the first coil 52a can be further extended.

A via hole 67 may be formed in the first film 61 corresponding to each of the first end 56a and the second end 56b. The first end 56a of the first coil 52a can be electrically connected to the second coil 52b through the via hole 67. [ The second end 56b of the first coil 52a can be electrically connected to the second coil 52b via the via hole 67. [

The length of the first extension line 55 may be larger than the shortest distance from the innermost portion of the second coil portion 51b to the outermost portion of the second coil portion 51b.

The first coil portion 51a may further include a bent portion 54 bent from an inner end of the first coil portion 51a adjacent to the first hollow portion 53a. One side of the bent portion 54 may be electrically connected to the first coil 52a and the other side of the bent portion 54 may be electrically connected to the first extended line 55. [

The first coil portion 51a may further include a first contact pad 58 connected to an end of the first extension line 55. [ The first contact pad 58 must be electrically connected to the signal line to which power is applied and in this case the contact resistance must be minimized so that the width of the first contact pad 58 is equal to the width of the first extension line 55 . The first contact pad 58 may have a rectangular shape, but is not limited thereto.

The first coil 52a, the bent portion 54, the first extension line 55, and the first contact pad 58 included in the first coil portion 51a may be integrally formed.

The first extension line 55 is formed integrally with the first coil 52a of the first coil portion 51a so that the first extension line 55 is separately fabricated to form the first coil 52a, It is possible to simplify the structure of the first coil portion 51a, shorten the process time, and reduce the process cost.

The wireless charging coil 50 according to the embodiment may further include a second coil portion 51b.

The second coil part 51b may be disposed on the upper surface of the first film 61. [ The second coil part 51b may be in contact with the upper surface of the first film 61.

The second coil portion 51b may include a second coil 52b that is wound multiple times in a spiral manner. And the second coil 52b may be disposed apart from each other in a plurality of turns of the wound portion. The second coil portion 51b may further include a second hollow portion 53b formed inside the second coil 52b. And the second hollow portion 53b is not provided with the second coil 52b. The second hollow portion 53b may have a circular or rectangular shape, but the present invention is not limited thereto.

The second coil portion 51b may further include a second extension line 57 extending from an outer end of the second coil portion 51b. That is, the second extension line 57 may be electrically connected to the second coil 52b. The second coil portion 51b may further include a second contact pad 59 connected to an end of the second extension line 57. [ The second contact pad 59 must be electrically connected to the signal line to which power is applied and in this case the contact resistance must be minimized so that the width of the second contact pad 59 is equal to the width of the second extension line 57 . The second contact pad 59 may have a rectangular shape, but is not limited thereto.

The first extension line 55 may overlap the plurality of second coils 52b with the first film 61 sandwiched therebetween.

The second coil 52b, the second extension line 57 and the second contact pad 59 included in the second coil portion 51b may be integrally formed.

The wireless charging coil 50 according to the embodiment may further include a second film 63. The second film (63) may be disposed on the lower surface of the first film (61). Specifically, the second film 63 may be disposed on the first coil portion 51a. The second film 63 can be in contact with the first film 61 and the first coil part 51a. The first coil portion 51a can be covered by the second film 63. [ That is, the first coil portion 51a is not exposed to the outside by the second film 63. [ Therefore, the second film 63 can protect the first coil portion 51a and prevent electrical shorting between the first coils 52a of the first coil portion 51a. The second film 63 may be formed of a material having excellent insulation and strength. For example, the second film 63 may be made of a plastic material. Specifically, the second film 63 may be PI or PET, but the present invention is not limited thereto.

The wireless charging coil 50 according to the embodiment may further include a third film 65. The third film 65 may be disposed on the upper surface of the first film 61. Specifically, the third film 65 may be disposed on the second coil portion 51b. The third film 65 may be in contact with the first film 61 and the second coil part 51b. And the second coil portion 51b can be covered by the third film 65. [ That is, the second coil portion 51b is not exposed to the outside by the third film 65. [ Therefore, the third film 65 can protect the second coil portion 51b and prevent electrical short-circuiting between the second coils 52b of the second coil portion 51b. The third film 65 may be formed of a material excellent in insulation and strength. For example, the third film 65 may be made of a plastic material. Specifically, the third film 65 may be PI or PET, but it is not limited thereto.

The first contact pad 58 in the first coil portion 51a is not covered by the second film 63 and the second contact pad 59 in the second coil portion 51b is not covered with the third film 65. [ But it is not limited thereto. The exposed first and second contact pads 58 and 59 may be electrically connected to a signal line to which power is supplied.

Meanwhile, the first coil portion 51a may include first through third conductive layers 71a, 73a, and 75a.

The first conductive layer 71a may be disposed on the lower surface of the first film 61. The first conductive layer 71a may be arranged in a plurality of turns and spaced apart from each other. The second conductive layer 73a may be disposed to surround the first conductive layer 71a. For example, the second conductive layer 73a may be disposed on the upper surface and the side surface of the first conductive layer 71a. That is, the first conductive layer 71a may be surrounded by the second conductive layer 73a. For example, the third conductive layer 75a may be disposed to surround the second conductive layer 73a. The third conductive layer 75a may be disposed on the upper surface and the side surface of the second conductive layer 73a. That is, the second conductive layer 73a may be surrounded by the third conductive layer 75a.

The first conductive layer 71a may be formed of a metal material having excellent adhesion to the first film 61 and electrical conductivity. For example, the first conductive layer 71a may include silver (Ag). As will be described later, the first conductive layer 71a may be formed by a printing process.

The second conductive layer 73a may be formed of a metal material having excellent electrical conductivity. In addition, the second conductive layer 73a may be formed of a metal material suitable for the plating process. For example, the second conductive layer 73a may include copper (Cu), aluminum (Al), or the like. As will be described later, the second conductive layer 73a may be formed by a plating process.

In order to increase the electrical conductivity, a certain thickness must be secured, and the thickness of the second conductive layer 73a is difficult to be secured by the plating process. Accordingly, in the embodiment, the first conductive layer 71a formed by the printing process can be supplemented with difficulty in securing the thickness of the second conductive layer 73a formed by the plating process. That is, the first conductive layer 71a having a predetermined thickness is formed by the printing process, and the second conductive layer 73a having an excellent electrical conductivity is formed on the first conductive layer 71a, It is possible to easily obtain the thickness required in the present invention.

The third conductive layer 75a may be formed of a metal material having excellent electrical conductivity and corrosion resistance. For example, the third conductive layer 75a may include nickel (Ni), chromium (Cr), or an alloy thereof. When the second conductive layer 73a is formed of copper, a third conductive layer 75a may be formed on the second conductive layer 73a to prevent corrosion of the second conductive layer 73a.

When the second conductive layer 73a itself is formed of a material having excellent corrosion resistance, the third conductive layer 75a may not be formed, so that the third conductive layer 75a may be selectively adopted.

The second coil portion 51b may include first through third conductive layers 71b, 73b, and 75b.

The first conductive layer 71b may be disposed on the lower surface of the first film 61. The first conductive layers 71b may be arranged in a plurality of turns and spaced apart from each other. The second conductive layer 73b may be disposed to surround the first conductive layer 71b. For example, the second conductive layer 73b may be disposed on the upper surface and the side surface of the first conductive layer 71b. That is, the first conductive layer 71b may be surrounded by the second conductive layer 73b. The third conductive layer 75b may be disposed to surround the second conductive layer 73b. For example, the third conductive layer 75b may be disposed on the upper surface and the side surface of the second conductive layer 73b. That is, the second conductive layer 73b may be surrounded by the third conductive layer 75b.

The first conductive layer 71b may be formed of a metal material having excellent adhesion to the first film 61 and electrical conductivity. For example, the first conductive layer 71b may include silver (Ag). As will be described later, the first conductive layer 71b may be formed by a printing process.

The second conductive layer 73b may be formed of a metal material having an excellent electrical conductivity. In addition, the second conductive layer 73b may be formed of a metal material suitable for the plating process. For example, the second conductive layer 73b may include copper (Cu), aluminum (Al), or the like. As will be described later, the second conductive layer 73b may be formed by a plating process.

In order to increase the electrical conductivity, a certain thickness must be secured, and it is difficult to secure the thickness of the second conductive layer 73b by the plating process. Accordingly, in the embodiment, it is possible to supplement the difficulty in securing the thickness of the second conductive layer 73b formed by the plating process by the first conductive layer 71b formed by the printing process. That is, the first conductive layer 71b having a predetermined thickness is formed by the printing process, and the second conductive layer 73b having an excellent electrical conductivity is formed on the first conductive layer 71b, It is possible to easily obtain the thickness required in the present invention.

The third conductive layer 75b may be formed of a metal material having excellent electrical conductivity and corrosion resistance. For example, the third conductive layer 75b may include nickel (Ni), chromium (Cr), or an alloy thereof. When the second conductive layer 73b is formed of copper, a third conductive layer 75b may be formed on the second conductive layer 73b to prevent corrosion of the second conductive layer 73b.

When the second conductive layer 73b itself is formed of a material having excellent corrosion resistance, the third conductive layer 75b may not be formed, so that the third conductive layer 75b may be selectively adopted.

On the other hand, the thickness of the first film 61 may be equal to or greater than the thickness of the second film 63 or the thickness of the third film 65. The thickness of the first film 61 is set such that the first coil 52a of the first coil portion 51a disposed above and below the first film 61 and the second coil 52b of the second coil portion 51b Can be defined as the minimum thickness that can be electrically isolated.

The thickness of the second film 63 may be the same as the thickness of the third film 65, but the thickness is not limited thereto. For example, the thickness of the first film 61 may be 1: 1 to 1: 5 times the thickness of the second film 63. For example, the thickness of the first film 61 may be 0.025 mm, the thickness of the second film 63 may be 0.015 mm, and the thickness of the third film 65 may be 0.015 mm.

The width W of the first coil 52a in the first coil portion 51a may be larger than the distance L between the adjacent first coils 52a. With this arrangement, the area occupied by the first coil 52a can be maximized and the wireless charging efficiency can be improved. For example, the width W of the first coil 52a may be 0.8 mm, and the distance L between the first coils 52a may be 0.1 mm. The gap L between the first coils 52a may be a space between the third conductive layers 75a of the adjacent first coil 52a to be described later in detail. The interval between the first conductive layers 71a of the adjacent first coils 52a may be 0.3 mm.

The width of the second coil 52b in the second coil portion 51b may be the same as the width of the first coil 52a in the first coil portion 51a, but the present invention is not limited thereto. The gap between the second coil portion 51b and the second coil 52b may be the same as the gap between the first coil portion 51a and the first coil 52a, but the present invention is not limited thereto. In the second coil portion 51b, the second coil 52b may overlap the first coil 52a in the first coil portion 51a, but the present invention is not limited thereto.

The width of the second coil 52b in the second coil portion 51b may be larger than the distance between the adjacent second coils 52b. With this arrangement, the area occupied by the second coil 52b can be maximized and the wireless charging efficiency can be improved. For example, the width of the second coil 52b may be 0.8 mm, and the distance between the second coils 52b may be 0.1 mm. The gap between the second coils 52b may be a space between the third conductive layers 75b of the adjacent second coil 52b to be described later in detail. The interval between the first conductive layers 71b of the adjacent second coils 52b may be 0.3 mm.

Meanwhile, the wireless charging coil 50 according to the embodiment may further include a plurality of via holes 67 formed in the first film 61. The via hole 67 may be an opening penetrating from the upper surface to the lower surface of the first film 61. The via hole 67 may have a circular shape when viewed from above, but the present invention is not limited thereto.

The via holes 67 may be formed in the overlapping region of the first film 61 corresponding to the first coil portion 51a and the second coil portion 51b which face each other and overlap. Concretely, each of the via holes 67 is formed by a plurality of first coils 52a of the first coil portion 51a and a plurality of second coils 52b of the second coil portion 51b, Can be formed in the overlapping region of the film (61).

6 o'clock direction, 9 o'clock direction and 12 o'clock position with respect to the first hollow portion 53a of the first coil portion 51a and the second hollow portion 53b of the second coil portion 51b, A plurality of via holes 67 may be formed along the direction.

For example, the diameter of the via hole 67 may be smaller than the width of the first coil 52a of the first coil portion 51a or the width of the second coil 52b of the second coil portion 51b, but this is not limited thereto .

For example, the via hole 67 may be provided with a connection portion 77. The connection part is formed by a first coil 52a of the first coil part 51a disposed on the lower surface of the first film 61 and a second coil part 52b of the second coil part 51b disposed on the upper surface of the first film 61 2 coils 52b can be electrically connected.

As a first example, the connection portion 77 may be formed of the same metal material as the first conductive layers 71a and 71b of the first coil portion 51a or the second coil portion 51b. For example, the connection portion 77 may include silver (Ag). For example, the first conductive layers 71a and 71b and the connecting portion 77 may be integrally formed at the same time. In this case, one side of the connection portion 77 is electrically connected to the first conductive layers 71a and 71b of the first coil 52a of the first coil portion 51a, and the other side of the connection portion 77 is electrically connected to the second And may be electrically connected to the first conductive layers 71a and 71b of the second coil 52b of the portion 51b.

As a second example, the connection portion 77 may be formed of the same metal material as the second conductive layers 73a and 73b of the first coil portion 51a or the second coil portion 51b. For example, the connection portion 77 may include copper (Cu), aluminum (Al), or the like. For example, the second conductive layers 73a and 73b and the connection portion 77 may be integrally formed at the same time. In this case, one side of the connection part 77 is electrically connected to the second conductive layers 73a and 73b through the first conductive layer 71a of the first coil 52a of the first coil part 51a, The other side of the connection part 77 may be electrically connected to the second conductive layers 73a and 73b through the first conductive layer 71b of the second coil 52b of the second coil part 51b.

As a third example, the connection portion 77 may be formed of the same metal material as the third conductive layers 75a and 75b of the first coil portion 51a or the second coil portion 51b. For example, the connecting portion 77 may include nickel (Ni), chromium (Cr), or an alloy thereof. For example, the third conductive layers 75a and 75b and the connecting portion 77 may be integrally formed at the same time. In this case, one side of the connecting portion 77 penetrates the first and second conductive layers 71a and 73a of the first coil 52a of the first coil portion 51a to form the third conductive layers 75a and 75b, And the other side of the connecting portion 77 penetrates the first and second conductive layers 71b and 73b of the second coil 52b of the second coil portion 51b to form the third conductive layer 75a , And 75b, respectively.

As a fourth example, the connecting portion 77 is formed by connecting the first conductive layer 71a, 71b, the second conductive layer 73a, 73b of the first coil portion 51a or the second coil portion 51b, (75a, 75b).

As a fifth example, the connecting portion 77 is formed by the first conductive layer 71a, 71b, the second conductive layer 73a, 73b, and the third conductive layer 71b of the first coil portion 51a or the second coil portion 51b, (75a, 75b).

The thickness of the second conductive layers 73a and 73b may be greater than the thickness of the first conductive layers 71a and 71b or the thickness of the third conductive layers 75a and 75b. The thickness of the first conductive layers 71a and 71b may be greater than the thickness of the third conductive layers 75a and 75b. The second conductive layers 73a and 73b may be formed thick to facilitate current flow. The third conductive layers 75a and 75b are for preventing corrosion of the second conductive layers 73a and 73b and may be formed thin.

For example, the thickness of the second conductive layers 73a and 73b may be 1: 7 to 1: 15 times the thickness of the first conductive layers 71a and 71b. For example, the thickness of the first conductive layers 71a and 71b may be 1: 1.5 to 1: 2.5 times the thickness of the third conductive layers 75a and 75b. For example, the thickness of the first conductive layers 71a and 71b is 0.01 mm, the thickness of the second conductive layers 73a and 73b is 0.12 mm, the thickness of the third conductive layers 75a and 75b is 0.005 mm, Lt; / RTI >

10 is a view for explaining a process for manufacturing a wireless charging coil according to the embodiment.

As shown in Fig. 10A, a first film 61 may be provided.

A plurality of via holes 67 may be formed in the first film 61. The via hole 67 may be formed to penetrate from the upper surface to the lower surface of the first film 61. The via hole 67 may be formed on the first film 61 by a laser irradiation or punching process.

The via hole 67 can be formed in the overlapping region of the first film 61 in which the first coil portion 51a and the second coil portion 51b to be formed later overlap. The overlap region may correspond to the first coil portion 51a or the second coil portion 51b. A first hollow portion 53a can be defined inside the first coil portion 51a and a second hollow portion 53b can be defined inside the second coil portion 51b. The first hollow portion 53a and the second hollow portion 53b may not have a coil.

The first conductive layers 71a and 71b may be formed on the lower surface and the upper surface of the first film 61, respectively, as shown in Fig. 10B. For example, a metal paste, specifically a silver (Ag) paste, is sprayed onto a screen so that silver paste having passed through the screen can be formed as a first conductive layer 71a on the lower surface of the first film 61 have. The screen may be designed to have an opening corresponding to the first conductive layer 71a.

First, a first conductive layer 71a may be formed on the lower surface of the first film 61 by performing a first printing process. The first conductive layer 71a formed on the lower surface of the first film 61 is electrically connected to the first coil 52a of the first coil portion 51a, the bent portion 54, the first extension line 55, 1 contact pads 58 as shown in FIG.

Then, a first conductive layer 71b may be formed on the upper surface of the first film 61 by performing a second printing process. The first conductive layer 71b formed on the upper surface of the first film 61 is electrically connected to the second coil 52b, the second extension line 57, and the first contact pad 58 of the second coil portion 51b, As shown in FIG.

Alternatively, the first conductive layer 71a may be formed on the lower surface of the first film 61 after the first conductive layer 71b is formed on the upper surface of the first film 61 first.

The first conductive layers 71a and 71b may be formed in the via hole 67 and may not be formed in the via 77 or in the via hole 67. [

As shown in Fig. 10C, the second conductive layers 73a and 73b may be formed on the first conductive layers 71a and 71b using a first plating process.

The first conductive layer 71a disposed on the lower surface of the first film 61 and the first conductive layer 71b disposed on the upper surface of the first film 61 may be formed by a first plating process, The second conductive layers 73a and 73b may be formed simultaneously.

Specifically, after the first film 61 having the first conductive layers 71a and 71b formed therein is immersed in an electrolytic solution containing a metallic material such as copper (Cu) and aluminum (Al) in the container, power is supplied to the electrolytic solution The second conductive layers 73a and 73b may be formed by attaching a metal material included in the electrolytic solution on the first conductive layers 71a and 71b. Accordingly, the first conductive layers 71a and 71b may be a seed layer for forming the second conductive layers 73a and 73b. The first conductive layers 71a and 71b may be surrounded by the second conductive layers 73a and 73b.

The third conductive layers 75a and 75b may be formed on the second conductive layers 73a and 73b by a second plating process, as shown in FIG. 10D. The third conductive layers 75a and 75b may be selectively adopted. If the second conductive layers 73a and 73b have corrosion resistance, the third conductive layers 75a and 75b may not be formed.

Specifically, after the first film 61 in which the second conductive layers 73a and 73b are formed is immersed in an electrolytic solution containing a metallic material such as nickel (Ni) or chromium (Cr) in the container, power is supplied to the electrolytic solution The third conductive layers 75a and 75b can be formed by attaching a metal material included in the electrolyte solution onto the second conductive layers 73a and 73b. Accordingly, the second conductive layers 73a and 73b may be a seed layer for forming the third conductive layers 75a and 75b. The second conductive layers 73a and 73b may be surrounded by the third conductive layers 75a and 75b.

Thus, a first coil part 51a made of first to third conductive layers is formed on the lower surface of the first film 61, and first to third conductive layers 51a and 51b are formed on the upper surface of the first film 61, The second coil portion 51b may be formed.

The first coil portion 51a may include a plurality of first coils 52a, a bent portion 54, a first extension line 55 and a first contact pad 58. [ The second coil portion 51b may include a plurality of second coils 52b, a second extension line 57, and a second contact pad 59.

The second film 63 and the third film 65 may be formed on the lower surface and the upper surface of the first film 61, for example, using a thermocompression bonding process, as shown in FIG. 10E.

The second and third films 63 and 65 may be simultaneously formed by the thermocompression process, and the second and third films 63 and 65 may be sequentially formed. The thermocompression process is a process in which heat and pressure are simultaneously applied, and the second and third films 63 and 65 can be fixed to the first film 61 by heat and pressure.

The first coil portion 51a and the second coil portion 51b are protected by the second and third films 63 and 65 and the plurality of first coils 52a and 52b of the first coil portion 51a are protected, Electrical shorting between the plurality of second coils 52b of the second coil portion 51b can be prevented.

10E, the lower surface of the second film 63 or the upper surface of the third film 65 has a flat surface. However, when the thickness of the second film 63 or the third film 65 is larger than the thickness of the first coil portion 65, The lower surface of the second film 63 or the upper surface of the third film 65 may be formed to have a thickness smaller than that of the first to third conductive layers 71a, 73a, 75a of the second coil portion 51a or the second coil portion 51b, It may have a non-flat surface. That is, the lower surface of the second film 63 or the upper surface of the third film 65 may have a shape corresponding to a thickness step between the first coil portion 51a and the first film 61, I never do that.

According to the conventional art, when an antenna is printed with a paste containing silver (Ag), the resistance is very high, which is not suitable for wireless charging. Thus, no one has attempted to make a wireless charging antenna in this manner.

However, in the wireless charging coil according to the embodiment, the paste containing silver (Ag) is printed to form the shape of the wireless charging coil, and the resistance is minimized through the optimal plating process, . Thus, the conventional FPCB type coil-to-coil process is reduced to half, and a wireless charging coil having the same performance can be obtained even though the cost is low. This is a solution that has not been tried by anyone in the industry, and has a remarkable process simplification and cost reduction effect.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Accordingly, the contents of such combinations and modifications should be construed as being included in the scope of the embodiments.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It can be seen that the modification and application of branches are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

50: Wireless charging coil
51a and 51b:
52a, 52b: coil
53a and 53b:
54:
55, 57: extension line
58, 59: contact pad
61, 63, 65: Film
67: Via hole
71a, 71b: a first conductive layer
73a, 73b: a second conductive layer
75a, 75b: a third conductive layer
77: Connection

Claims (23)

A first film having a plurality of via holes;
A first coil portion disposed on a first side of the first film;
A second coil portion disposed on a second side of the first film;
A connection portion disposed in the plurality of via holes to electrically connect the first coil portion and the second coil portion; And
And a first extension line extending from an inner end of the first coil section and overlapping the second coil section,
Wherein the first and second coil portions include at least one conductive layer,
Wherein each of the first and second coil portions includes a first conductive layer, a second conductive layer surrounding the second conductive layer, and a third conductive layer surrounding the second conductive layer. The method according to claim 1,
And a bent portion bent from an inner end of the first coil portion. 3. The method of claim 2,
Wherein the first coil portion includes a first coil wound a plurality of times,
Wherein the bent portion has one side electrically connected to the first coil and the other side electrically connected to the first extension line. The method of claim 3,
Wherein the first coil, the bent portion, and the first extension line are integrally formed. The method of claim 3,
The second coil portion includes a plurality of turns of a second coil; And
And a second extension line extending from one side of the second coil to the outside of the second coil section,
Wherein the first extension line overlaps with the second coil. 6. The method of claim 5,
Wherein the first extension line extends in a direction crossing the second coil. 6. The method of claim 5,
And the first coil and the second coil are electrically connected through the via. The method of claim 3,
The first coil having first and second ends spaced apart from each other,
Wherein one side of the first extension line is spaced from the first end of the first coil and the other side of the first extension line is spaced from the second end of the first coil. 9. The method of claim 8,
And the distance between the first extension line and the first end or the second end is 0.4 mm to 0.8 mm. The method according to claim 1,
Wherein the length of the first extension line is larger than the shortest distance from the innermost side of the second coil section to the outermost side of the second coil section. The method according to claim 1,
Wherein the second conductive layer comprises a metal material different from the first conductive layer. The method according to claim 1,
Wherein the third conductive layer comprises a metal material different from the first and second conductive layers. The method according to claim 1,
Wherein the first conductive layer comprises silver (Ag)
Wherein the second conductive layer comprises copper (Cu) or aluminum (Al)
Wherein the third conductive layer comprises at least one selected from the group consisting of nickel (Ni), chromium (Cr), and alloys thereof. The method according to claim 1,
Wherein the thickness of the second conductive layer is 1: 7 to 1: 15 times the thickness of the first conductive layer. The method according to claim 1,
Wherein the thickness of the first conductive layer is 1: 1.5 times to 1: 2.5 times the thickness of the third conductive layer. The method according to claim 1,
Wherein the connection portion includes the same metal material as the second conductive layer. 6. The method of claim 5,
Wherein one side of the connection portion is electrically connected to the second conductive layer through the first conductive layer of the first coil,
And the other side of the connection portion is electrically connected to the second conductive layer through the first conductive layer of the second coil. The method according to claim 1,
Wherein the connection portion includes the same metal material as at least one of the first to third conductive layers. The method according to claim 1,
A second film disposed on the first coil part; And
And a third film disposed on the second coil portion. Providing a first film having a plurality of via holes;
Forming a first conductive layer on the first and second sides of the first film, the first conductive layer being spaced apart from each other by a plurality of turns using a printing process;
Forming a second conductive layer surrounding the first conductive layer using a first plating process;
Forming a third conductive layer surrounding the second conductive layer using a second plating process; And
And forming a connection portion in the via hole,
A first coil portion is formed by the first to third conductive layers formed on the first surface of the first film,
A second coil portion is formed by the first to third conductive layers formed on the second surface of the first film,
Wherein the connection portion is formed simultaneously with one of the first to third conductive layers. 21. The method of claim 20,
Wherein the first conductive layer comprises silver (Ag)
Wherein the second conductive layer comprises copper (Cu) or aluminum (Al)
Wherein the third conductive layer comprises at least one selected from the group consisting of nickel (Ni), chromium (Cr), and alloys thereof. 21. The method of claim 20,
And forming a second film and a third film on each of the first and second surfaces of the first film using a thermocompression process. Printed circuit board;
A plurality of wireless charging coils according to any one of claims 1 to 19 arranged on the printed circuit board; And
And a shielding member disposed between the printed circuit board and the wireless charging coil.

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