KR20190047857A - Wireless charging coil, manufacturing method thereof and wireless charging apparatus having the same - Google Patents

Abstract

An embodiment of the present invention relates to a wireless charging coil, a manufacturing method thereof, and a wireless charging device having the same. According to the embodiment of the present invention, the wireless charging device comprises: a first insulation layer; a coil unit disposed on the first insulation layer and including a coil wound a plurality of times from the inner end to the outer end thereof; a first terminal disposed on the first insulation layer; a first lead unit connecting the outer end of the coil unit with the first terminal; a second terminal disposed on the first insulation layer; a second insulation layer disposed on the coil unit; and a connecting unit disposed on the second insulation layer and connecting the inner end of the coil unit with the second terminal. The second insulation layer includes a first through unit and a second through unit. The connecting unit is connected to the inner end of the coil unit through the first through unit, and the connecting unit is connected to the second terminal through the second through unit. The connecting unit may include a first conductive pattern including silver and a second conductive pattern including copper on the first conductive pattern. The embodiment of the present invention may have a simple process and reduce the material cost.

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.

Conventional wireless charging coils adopt FPCB type for space utilization and precision design. In particular, the FPCB type wireless charging coil applies a double-sided FPCB to apply a signal to the inner end of the coil.

However, the double-sided FPCB has a problem that the process becomes complicated and the price increases because of formation of a via for connecting the coil, formation of an insulating layer for insulation, increase of a coil material, and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a wireless charging coil, a manufacturing method thereof, and a wireless charging device having the same.

It is still another object of the present invention to provide a wireless charging coil having a simple process and a reduced material cost, a method of manufacturing the same, and a wireless charging device having the same.

Still another object of the present invention is to provide a wireless charging coil with reduced thickness, a method of manufacturing the same, and a wireless charging apparatus having the same.

It is still another object of the present invention to provide a wireless charging coil having excellent resistance characteristics, a method of manufacturing the same, and a wireless charging apparatus having the same.

It is still another object of the present invention to provide a wireless charging coil having high durability, a method of manufacturing the same, and a wireless charging apparatus having the same.

The technical problems to be solved by the embodiments are not limited to the technical problems mentioned above, and other technical problems which are not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

According to an aspect of the present invention, there is provided a wireless charging apparatus including: a first insulation layer; A coil portion disposed on the first insulating layer and including a coil wound multiple times from an inner end to an outer end; A first terminal disposed on the first insulating layer; A first lead portion connecting an outer end of the coil portion and the first terminal; A second terminal disposed on the first insulating layer; A second insulating layer disposed on the coil portion; And a connecting portion disposed on the second insulating layer and connecting an inner end of the coil portion to the second terminal, wherein the second insulating layer includes a first penetrating portion and a second penetrating portion, Is connected to an inner end of the coil portion through the first penetrating portion, the connecting portion is connected to the second terminal through the second penetrating portion, and the connecting portion includes a first conductive pattern including silver, And a second conductive pattern comprising copper on the second conductive pattern.

In the wireless charging apparatus according to the embodiment, the first conductive pattern may be formed by printing.

Also, in the wireless charging apparatus according to the embodiment, the second conductive pattern may be formed by plating.

In addition, in the wireless charging apparatus according to the embodiment, the connection portion may include a third conductive pattern including nickel on the second conductive pattern.

Also, in the wireless charging apparatus according to the embodiment, the third conductive pattern may be formed by plating.

Further, in the wireless charging apparatus according to the embodiment, the thickness of the second conductive pattern may be larger than the thickness of the first conductive pattern.

Further, in the wireless charging apparatus according to the embodiment, the thickness of the first conductive pattern may be larger than the thickness of the third conductive pattern.

A wireless charging apparatus according to an embodiment includes: a first insulating layer; A coil portion disposed on the first insulating layer and including a coil wound multiple times from an inner end to an outer end; A first terminal disposed on the first insulating layer; A first lead portion connecting an outer end of the coil portion and the first terminal; A second terminal disposed on the first insulating layer; A second insulating layer disposed on the coil portion; And a connecting portion disposed on the second insulating layer and connecting an inner end of the coil portion to the second terminal, wherein the second insulating layer includes a first penetrating portion and a second penetrating portion, Is connected to the inner end of the coil portion through the first penetrating portion, the connecting portion is connected to the second terminal through the second penetrating portion, and the connecting portion is formed on the printed first conductive pattern and the second conductive pattern And may include a plated second conductive pattern.

In addition, in the wireless charging apparatus according to the embodiment, the connection portion may include a third conductive pattern plated on the second conductive pattern.

Also, in the wireless charging apparatus according to the embodiment, the first conductive pattern may include silver, and the second conductive pattern may include copper.

Effects of the wireless charging coil according to the embodiment, the manufacturing method thereof, and the wireless charging device having the same will be described as follows.

Embodiments can provide a wireless charging coil, a manufacturing method thereof, and a wireless charging device having the same.

Further, the embodiment can simplify the process and reduce the material cost.

Further, the embodiment can be reduced in thickness.

In addition, the embodiments can have excellent resistance characteristics.

In addition, the embodiment can have high durability.

The effects obtained in the embodiments are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below .

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 noted, however, that the technical features of the embodiments 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 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 a top plan view of a wireless charging coil according to one embodiment.
5 is a cross-sectional view taken along line AB in Fig.
6A is a plan view illustrating a first process for manufacturing a wireless charging coil according to an embodiment.
6B is a cross-sectional view taken along line AB in FIG. 6A.
7A is a plan view illustrating a second process for manufacturing a wireless charging coil according to one embodiment.
FIG. 7B is a cross-sectional view taken along line AB in FIG. 7A. FIG.
8A is a plan view illustrating a third process for manufacturing a wireless charging coil according to an embodiment.
FIG. 8B is a cross-sectional view taken along line AB in FIG. 8A. FIG.
9A is a plan view illustrating a fourth step of manufacturing a wireless charging coil according to an embodiment.
FIG. 9B is a cross-sectional view taken along line AB in FIG. 9A. FIG.
10A is a plan view showing a wireless charging coil according to another embodiment.
FIG. 10B is a cross-sectional view taken along line AB in FIG. 10A. FIG.

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 the above embodiments, as long as all of the constituent elements of the embodiment are described as being combined or combined in one operation. That is, within the scope of the object of the embodiment, all of the elements 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 or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments belong, unless otherwise defined. Commonly used terms, such as predefined terms, are to be interpreted as being consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless explicitly defined in the examples.

In describing the components of the embodiment, 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 wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, , A wireless power transmitter, and a wireless charging device. For the sake of convenience, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver Terminals and the like can be used in combination.

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, Power may be transmitted to the device.

As an example, a wireless power transmitter can be used not only on a desk or on a table, but also developed for automobiles 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 receiving means according to an embodiment, but not limited thereto, may be used for a small electronic device such as a toothbrush, an electronic tag, a lighting device, Quot;), 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 the electromagnetic induction scheme, the electromagnetic resonance scheme, and the RF wireless power transmission scheme. Generally, a wireless power transmitter and a wireless power receiver that constitute a wireless power system can exchange control signals or information through in-band communication or Bluetooth low energy (BLE) 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 can 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 reception 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, 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 status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but 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 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 may include a power conversion unit 210, a power transmission unit 220, a communication unit 230, a control unit 240, and a sensing unit 250 . It should be noted that the configuration of the wireless power transmitter 200 described above is not necessarily an essential configuration, and may be configured to include more or less 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.

To this end, the power conversion unit 210 may convert the power supplied from the power supply unit 260 into the power for wireless transmission.

The power transmission unit 220 may be configured to include a multiplexer 321 (or a multiplexer), and a transmission coil 222. [ In addition, the power transmitting unit 220 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

2, the power transmission unit 220 includes a multiplexer 221 and a plurality of transmission coils 222 for controlling the output power of the power conversion unit 210 to be transmitted to the transmission coil, that is, And first through n-th transmission coils.

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.

In addition, the control unit 240 transmits a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 232 during the first detection signal transmission procedure, Lt; / RTI > 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. For example, 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), and an overvoltage / overcurrent / However, the present invention is not limited thereto, and various status information for identifying the status of the wireless power receiver may be included.

The demodulating unit 232 may identify which of the transmitting coils the demodulated signal is received and may provide the controlling unit 240 with a predetermined transmitting coil identifier corresponding to the identified transmitting coil.

In one example, the wireless power transmitter 200 may obtain the signal strength indicator through in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.

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 the description of FIG. 2, the wireless power transmitter 200 and the wireless power receiver perform in-band communication. However, the wireless power transmitter 200 and the wireless power receiver use only the frequency band Directional communication through different frequency bands. For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

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. Also, the sensing unit 250 may measure the internal temperature of the wireless power transmitter 200 or the inside of the charging interface (surface) to determine whether overheating occurs, and provide the measurement result to the control unit 240. For example, the control unit 240 may adaptively cut off the power supply from the power supply unit 260 based on the voltage / current value or the internal temperature value measured by the sensing unit 250. To this end, a power cutoff circuit for shutting off power supplied from the power supply unit 260 may be further provided at one side of the power conversion unit 210. [

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 receiving coil 310, a rectifier 320, a DC / DC converter 330, a load 340, a sensing unit 350, 360, and a main control unit 370. Here, the communication unit 360 may include at least one of a demodulation unit 361 and a modulation unit 362.

Although the wireless power receiver 300 shown in the example of FIG. 3 is shown as being capable of exchanging information with a wireless power transmitter through in-band communication, this is only one embodiment, and in another embodiment The communication unit 360 may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

AC power received through the receiving coil 310 may be transmitted to the rectifying unit 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 receiving coil 310 may include a plurality of receiving coils (not shown), that is, first through n-th receiving 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, and another embodiment may include a predetermined frequency controller having a function of adjusting 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. For example, the sensing unit 350 may measure the intensity of the current applied to the reception coil 310 according to the wireless power reception, and may transmit the measurement result to the main control unit 370. As another example, 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.

For example, the main controller 370 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage occurs, a predetermined 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 through the receiving coil 310 or a separate coil (not shown). The main control unit 370 may determine that the sensing signal is received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value. When receiving the sensing signal, the signal intensity indicator corresponding to the sensing signal is received by the modulating unit 362 To be transmitted to the wireless power transmitter. 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 470 may control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulation unit 362. [

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. 4 is a plan view showing a wireless charging coil according to an embodiment, and FIG. 5 is a cross-sectional view taken along line A-B in FIG.

Referring to FIGS. 4 and 5, the wireless charging coil 40 according to an embodiment may include an insulation portion 60. More specifically, the insulating portion 60 may include a first insulating layer 61 and a second insulating layer 62.

The first insulating layer 61 may be a supporting member for supporting the coil portion 41 disposed on the upper surface, or may be an insulating member or insulating film for insulating from an external configuration. The first insulating layer 61 may be formed of a transparent material, but the present invention is not limited thereto.

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

The wireless charging coil 40 according to one embodiment may include a coil portion 41. [

The coil portion 41 may be disposed on the upper surface of the first insulating layer 61. The coil portion 42 can be in contact with the upper surface of the first insulating layer 61. In addition, the coil portion 41 may be disposed on the lower surface of the second insulating layer 62. The coil portion 42 can be in contact with the lower surface of the second insulating layer 62.

The coil portion 41 may include a coil 42 wound in a spiral multiple turns. The coils 42 may be spaced apart from each other in a plurality of turns of the wound portion. The coil portion 41 may further include a hollow portion 43 formed inside the coil 42. The hollow portion 43 is not provided with the coil 42. [ The hollow portion 43 may have a circular or rectangular shape, but the present invention is not limited thereto.

The coil portion 41 may further include a first lead portion 44 extending from an outer end 42a of the coil 42. [ That is, the first lead portion 44 may be electrically connected to the coil 42. [ The coil portion 41 may further include a first terminal P1 connected to an end of the first lead portion 44. [ The width of the first terminal P1 is larger than the width of the first lead portion 44 because the first terminal P1 must be electrically connected to the signal line to which the power is applied and in this case, . The first pad P1 may have a rectangular shape, but the present invention is not limited thereto.

The coil 42, the first lead portion 44 and the first pad P1 included in the coil portion 41 may be integrally formed.

The coil portion 41 may further include a second lead portion 45. The second lead portion 45 may be disposed in a region adjacent to the first lead portion 44. The second lead portion 45 may be electrically connected to the inner end 42b of the coil 42 through the connection portion 50. [ The coil portion 41 may further include a second terminal P2 connected to an end of the second lead portion 45. [ The width of the second terminal P2 is larger than the width of the second lead portion 45 because the second terminal P2 should be electrically connected to the signal line to which power is supplied and in this case, . The second pad P2 may have a rectangular shape, but it is not limited thereto.

The second insulating layer 62 may be disposed on the upper surface of the first insulating layer 61. Specifically, the second insulating layer 62 may be disposed on the coil portion 41. [ The coil portion 41 can be covered by the second insulating layer 62. [ That is, the coil portion 41 is not exposed to the outside by the second insulating layer 62. Therefore, the second insulating layer 62 protects the coil portion 41 and can prevent electric short-circuiting between the coils 42 of the coil portion 41. The second insulating layer 62 may be a supporting member for supporting the coil part 41 disposed on the underside, or may be an insulating member for insulating from an external configuration or an insulating film. The second insulating layer 62 may be formed of a transparent material, but the present invention is not limited thereto.

The second insulating layer 62 may be formed of a material having excellent insulating properties and strength. For example, the second insulating layer 62 may be made of a plastic material. The second insulating layer 62 may be formed of a thin and flexible material. Specifically, the second insulating layer 62 may be polyimide (PI) or polyethylene terephthalate (PET), but the present invention is not limited thereto.

The second insulating layer 62 may include a first terminal hole PH1 disposed corresponding to the first terminal P1 and a second terminal hole PH2 disposed corresponding to the second terminal P2 . That is, the first terminal P1 of the coil portion 41 may not be covered by the first terminal hole PH1 of the second insulating layer 62. [ The second terminal P2 of the coil portion 41 may not be covered by the second terminal hole PH2 of the second insulating layer 62. [ The first terminal P1 and the second terminal P2 thus exposed may be electrically connected to a signal line (not shown) to which power is supplied.

The second insulation layer 62 is formed by the first penetration portion VH1 disposed corresponding to the inner end 42b of the coil 42 of the coil portion 41 and the second lead portion 45 of the coil portion 41, (VH2) arranged corresponding to one end of the first through hole (VH2).

On the other hand, the thickness of the first insulating layer 61 may be equal to or greater than the thickness of the second insulating layer 62. For example, the thickness of the first insulating layer 61 may be 1: 1 to 1: 5 times the thickness of the second insulating layer 62. For example, the thickness of the first insulating layer 61 may be, for example, 0.025 mm, and the thickness of the second insulating layer 62 may be 0.015 mm. In addition, the thickness of the second insulating layer 62 may be 0.013 mm to 0.025 mm.

The width of the coil 42 in the coil portion 41 may be larger than the interval between adjacent coils 42. [ With this arrangement, the occupied area of the coil 42 can be maximized and the wireless charging efficiency can be improved. For example, the width of the coil 42 may be 0.8 mm, and the spacing between the coils 42 may be 0.1 mm.

The wireless charging coil 40 according to one embodiment may include a connection 50. The connecting portion 50 may be disposed on the upper surface of the second insulating layer 62. One end of the connection portion 50 may be disposed on the inner end 42b of the coil 42 through the first penetration portion VH1. That is, one end of the connection portion 50 may be electrically connected to the inner end 42b of the coil 42. [ The other end of the connection portion 50 may be disposed on one end of the second lead portion 45 through the second penetration portion VH2. That is, the other end of the connection portion 50 may be electrically connected to the second lead portion 45.

The connection portion 50 may include a first conductive pattern 51 and a second conductive pattern 52.

The first conductive pattern 51 is disposed on the upper surface of the second insulating layer 62 and has one end disposed on the inner end 42b of the coil 42 through the first penetration portion VH1, And may be disposed on one end of the second lead portion 45 through the second penetration portion VH2. The second conductive pattern 52 may be disposed on the first conductive pattern 51. In addition, the second conductive pattern 52 may be disposed to surround the first conductive pattern 51. For example, the second conductive pattern 52 may be disposed on the upper surface and the side surface of the first conductive pattern 51. That is, the first conductive pattern 51 may be surrounded by the second conductive pattern 52.

The first conductive pattern 51 may be formed of a metal material having excellent adhesion to the second insulating layer 62 and electrical conductivity. For example, the first conductive pattern 51 may include silver (Ag). As will be described later, the first conductive pattern 51 may be formed by a printing process.

The second conductive pattern 52 may be formed of a metal material having an excellent electrical conductivity. In addition, the second conductive pattern 52 may be formed of a metal material suitable for the plating process. For example, the second conductive pattern 52 may include copper (Cu), aluminum (Al), or the like. As will be described later, the second conductive pattern 52 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 pattern 52 by the plating process. Accordingly, in the embodiment, it is possible to supplement the difficulty in securing the thickness of the second conductive pattern 52 formed by the plating process by the first conductive pattern 51 formed by the printing process. That is, the first conductive pattern 51 having a predetermined thickness is formed by the printing process, and the second conductive pattern 52 having excellent electrical conductivity can be formed on the first conductive pattern 51.

On the other hand, the thickness of the second conductive pattern 52 may be larger than the thickness of the first conductive pattern 51. The second conductive pattern 52 may be formed thick to facilitate current flow.

For example, the thickness of the second conductive pattern 52 may be 1: 7 to 1: 15 times the thickness of the first conductive pattern 51. For example, the thickness of the first conductive pattern 51 may be 0.01 mm to 0.02 mm, and the thickness of the second conductive pattern 52 may be 0.12 mm.

Thus, one embodiment provides a FPCB type coil for space utilization and precision design, while simplifying the process and reducing the material cost. Also, one embodiment does not use a double-sided coil, so the thickness can be reduced. In addition, one embodiment may have excellent resistance characteristics of a connection portion to which a signal is applied.

6 to 9 illustrate a process for manufacturing a wireless charging coil according to an embodiment.

FIG. 6A is a plan view illustrating a first process for manufacturing a wireless charging coil according to an embodiment, FIG. 6B is a sectional view taken along the line AB in FIG. 6A, FIG. 7A is a view showing a wireless charging coil according to an embodiment 7A is a cross-sectional view taken along line AB in FIG. 7A, FIG. 8A is a plan view for explaining a third process for manufacturing a wireless charging coil according to an embodiment, and FIG. 9A is a plan view for explaining a fourth step of manufacturing a wireless charging coil according to an embodiment, and FIG. 9B is a sectional view taken along line AB in FIG. 9A. FIG. 9A is a cross- to be.

Referring to FIGS. 6A and 6B, the first step may include forming a coil portion 41 on the upper surface of the first insulating layer 61. More specifically, in the first step, the coil part 41 may be formed on the upper surface of the first insulating layer 61 by an etching process. For example, the coil portion 41 may be formed by etching a metal plate, for example, a metal plate containing copper (Cu), aluminum (Al), or the like by an etching solution or the like. The present invention is not limited thereto, and the coil portion 41 may be formed on the upper surface of the first insulating layer 61 by a printing process.

The coil portion 41 may include a hollow portion 43, a coil 42, a first lead portion 44, a first pad P1, a second lead portion 45, and a second pad P2. have.

In the first step, the hollow portion 43 in which the coil 42 is not disposed can be formed inside. The first process may form a coil 42 that is wound several times from the inner end 42b of the coil 42 to the outer end 42a. In the first step, the first pad P1 and the second pad P2 disposed on one side of the first insulating layer 61 may be formed. The first step may form the first lead wire 44 extending from the outer end 42a of the coil 42 to the first pad Pl. The first step may form a second lead 45 extending from the outside of the coil 42 to the second pad P2 so as to correspond to the inner end 42b of the coil 42. [

Referring to FIGS. 7A and 7B, the second step may include forming a second insulating layer 62 on the upper surface of the first insulating layer 61. For example, in the second step, a second insulating layer 62 may be formed on the upper surface of the first insulating layer 61 using a thermal compression process. The thermocompression process is a process in which heat and pressure are simultaneously applied, and the second insulation layer 62 can be fixed to the first insulation layer 61 by heat and pressure. As shown in FIG. 7B, air gaps may exist in the first insulating layer 61 and the second insulating layer 62. The present invention is not limited thereto and a structure may be formed between the first insulating layer 61 and the second insulating layer 62 such as a region spaced between the hollow portion 43 and the coil 41 of the coil portion 41, The first insulating layer 61 and the second insulating layer 62 may have a shape in which they are in direct contact with each other without an air gap.

In the second step, the first through hole VH1, the second through hole VH2, the first terminal hole PH1, and the second terminal hole PH2 are formed in the second insulating layer 62 . More specifically, the first penetrating portion VH1, the second penetrating portion VH2, the first terminal hole PH1, and the second terminal hole PH2 are formed on the second insulating layer 62 by a laser irradiation or punching process As shown in FIG. The first through hole VH1 may be formed corresponding to the inner end 42b of the coil 42. [ The second penetrating portion VH2 may be formed corresponding to one end of the second lead wire 45. [ The first terminal hole PH1 may be formed corresponding to the first pad P1. And the second terminal hole PH2 may be formed corresponding to the second pad P2.

Referring to FIGS. 8A and 8B, the third step may include forming a first conductive pattern 51 on the upper surface of the second insulating layer 62. In the third step, the first conductive pattern 51 may be formed on the upper surface of the second insulating layer 62 by a printing process. For example, in the third step, a metal paste, specifically, a silver (Ag) paste is sprayed onto a screen, and a silver paste passing through the screen is coated on the upper surface of the first insulating layer 62 with a first conductive pattern 51 ). The screen may be designed to have an opening corresponding to the first conductive pattern 51.

The first conductive pattern 51 is formed to correspond to the upper surface of the inner end 42b of the coil 42 and is formed to correspond to the upper surface of one end of the second lead portion 45, And may extend from the upper surface of the end 42b to the upper surface of the end of the second lead portion 45 to correspond to the upper surface of the second insulating layer 62. [

In addition, the first conductive pattern 51 may have a first width W1.

Referring to FIGS. 9A and 9B, the fourth step may include forming a second conductive pattern 52 on the first conductive pattern 51. In the fourth step, the second conductive pattern 52 may be formed on the first conductive pattern 51 by a first plating process. For example, in the fourth step, after the second insulating layer 62 having the first conductive pattern 51 formed therein is immersed in an electrolyte solution containing a metallic material such as copper (Cu) or aluminum (Al) A metal material included in the electrolytic solution may be adhered to the first conductive pattern 51 to form the second conductive pattern 52. Accordingly, the first conductive pattern 51 may be a seed layer for forming the second conductive pattern 52. The first conductive pattern 51 may be surrounded by the second conductive pattern 52.

The second conductive pattern 52 is formed to correspond to the upper surface of the inner end 42b of the coil 42 and is formed to correspond to the upper surface of one end of the second lead portion 45, And may extend from the upper surface of the end 42b to the upper surface of the end of the second lead portion 45 to correspond to the upper surface of the second insulating layer 62. [

The second conductive pattern 51 may have a second width W2. The second width W2 may be equal to or greater than the first width W1.

Thus, one embodiment provides a FPCB type coil for space utilization and precision design, while simplifying the process and reducing the material cost. Also, one embodiment does not use a double-sided coil, so the thickness can be reduced. In addition, one embodiment may have excellent resistance characteristics of a connection portion to which a signal is applied.

10A is a plan view showing a wireless charging coil according to another embodiment, and FIG. 10B is a sectional view taken along line A-B in FIG. 10A.

The wireless charging coil according to another embodiment is the same in configuration as the wireless charging coil according to the embodiment except for the configuration of the connection portion. Hereinafter, the description of the wireless charging coil according to another embodiment will be mainly described with respect to a configuration different from the wireless charging coil according to the embodiment.

10A and 10B, a connection portion 150 of a wireless charging coil 140 according to another embodiment includes a first conductive pattern 51 and a second conductive pattern 52, And may further include a third conductive pattern 53 at the connecting portion 50 of the charging coil 40.

That is, the connection part 150 may include a first conductive pattern 51, a second conductive pattern 52, and a third conductive pattern 53.

The third conductive pattern 53 may be disposed to surround the second conductive pattern 52. For example, the third conductive pattern 53 may be disposed on the upper surface and the side surface of the second conductive pattern 52. That is, the second conductive pattern 52 may be surrounded by the third conductive pattern 53.

The third conductive pattern 53 may be formed of a metal material having excellent electrical conductivity and corrosion resistance. For example, the third conductive pattern 53 may include nickel (Ni), chromium (Cr), or an alloy thereof. When the second conductive pattern 52 is formed of copper, a third conductive pattern 53 may be formed on the second conductive pattern 52 to prevent corrosion of the second conductive pattern 52.

On the other hand, the thickness of the third conductive pattern 53 may be smaller than the thickness of the first conductive pattern 51. The third conductive pattern 53 is for preventing corrosion of the second conductive pattern 52 and may be formed thin. For example, the thickness of the first conductive pattern 51 may be 1: 1.5 to 1: 2.5 times the thickness of the third conductive pattern 53. For example, the thickness of the third conductive pattern 53 may be 0.005 mm, i.e., 5 占 퐉.

The manufacturing process of the wireless charging coil according to another embodiment may further include a fifth process in the manufacturing process of the wireless charging coil according to one embodiment.

The fifth step may include forming a third conductive pattern 53 on the second conductive pattern 52. In the fifth step, the third conductive pattern 53 may be formed on the second conductive pattern 52 by a second plating process. For example, in the fifth step, after the second insulating layer 62 having the second conductive pattern 52 formed thereon is immersed in an electrolytic solution containing a metallic material such as nickel (Ni) or chromium (Cr) The metal material included in the electrolyte may be deposited on the second conductive pattern 52 to form the third conductive pattern 53. Accordingly, the second conductive pattern 52 may be a seed layer for forming the third conductive pattern 53. The second conductive pattern 52 may be surrounded by the third conductive pattern 53.

The third conductive pattern 53 is formed to correspond to the upper surface of the inner end 42b of the coil 42 and is formed to correspond to the upper surface of the one end of the second lead portion 45, And may extend from the upper surface of the end 42b to the upper surface of the end of the second lead portion 45 to correspond to the upper surface of the second insulating layer 62. [

The third conductive pattern 53 may have a third width W3. The third width W3 may be equal to or greater than the second width W2.

Thus, another embodiment provides a FPCB type coil for space utilization and precision design, while simplifying the process and reducing the material cost. Further, the other embodiments do not use the double-sided coil, so that the thickness can be reduced. In another embodiment, the resistance characteristic of the connection portion to which the signal is applied may be excellent. Further, in another embodiment, the connection portion to which the signal is applied may have a high durability.

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.

40, 140: Wireless charging coil
41:
42: Coil
43: hollow
44, 45:
P1, P2: Terminal
61, 62: Isolation
PH: Terminal hole
VH:
50: Connection
51: first conductive pattern
52: second conductive pattern
53: Third conductive pattern

Claims (10)

A first insulating layer;
A coil portion disposed on the first insulating layer and including a coil wound multiple times from an inner end to an outer end;
A first terminal disposed on the first insulating layer;
A first lead portion connecting an outer end of the coil portion and the first terminal;
A second terminal disposed on the first insulating layer;
A second insulating layer disposed on the coil portion; And
And a connecting portion disposed on the second insulating layer and connecting an inner end of the coil portion to the second terminal,
Wherein the second insulating layer includes a first penetrating portion and a second penetrating portion,
The connecting portion is connected to an inner end of the coil portion through the first penetrating portion,
The connecting portion is connected to the second terminal through the second penetrating portion,
Wherein the connection comprises a first conductive pattern comprising silver and a second conductive pattern comprising copper over the first conductive pattern. The method according to claim 1,
Wherein the first conductive pattern is formed by printing. The method according to claim 1,
And the second conductive pattern is plated. The method according to claim 1,
Wherein the connection portion comprises a third conductive pattern comprising nickel on the second conductive pattern. 5. The method of claim 4,
And the third conductive pattern is formed by plating. The method according to claim 1,
Wherein the thickness of the second conductive pattern is larger than the thickness of the first conductive pattern. 5. The method of claim 4,
Wherein the thickness of the first conductive pattern is larger than the thickness of the third conductive pattern. A first insulating layer;
A coil portion disposed on the first insulating layer and including a coil wound multiple times from an inner end to an outer end;
A first terminal disposed on the first insulating layer;
A first lead portion connecting an outer end of the coil portion and the first terminal;
A second terminal disposed on the first insulating layer;
A second insulating layer disposed on the coil portion; And
And a connecting portion disposed on the second insulating layer and connecting an inner end of the coil portion to the second terminal,
Wherein the second insulating layer includes a first penetrating portion and a second penetrating portion,
The connecting portion is connected to an inner end of the coil portion through the first penetrating portion,
The connecting portion is connected to the second terminal through the second penetrating portion,
Wherein the connection portion includes a printed first conductive pattern and a second conductive pattern plated on the second conductive pattern. 9. The method of claim 8,
Wherein the connection portion includes a third conductive pattern plated on the second conductive pattern. 9. The method of claim 8,
Wherein the first conductive pattern comprises silver,
Wherein the second conductive pattern comprises copper.

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