KR20190115573A - Wireless charging device - Google Patents

Abstract

The present invention relates to a wireless charging device comprising: a first shielding unit including a first region and a second region; a first coil module arranged in the first region of the first shielding unit; a second shielding unit arranged in the second region of the first shielding unit; and a second coil module arranged in the second shielding unit. The second coil module can include a region overlapping with the first coil module in a vertical direction.

Description

Wireless charging device

An embodiment relates to a wireless charging device.

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

In general, as an example of an electrical connection method between a charging device and a battery for charging power to a battery, the terminal is supplied with commercial power and converted into a voltage and a current corresponding to the battery to supply electrical energy to the battery through the terminal of the battery. Supply method. This terminal supply method is accompanied by the use of a physical cable (cable) or wire. Therefore, when handling a lot of terminal supply equipment, many cables occupy considerable working space, are difficult to organize, and are not good in appearance. In addition, the terminal supply method may cause problems such as instantaneous discharge phenomenon due to different potential difference between the terminals, burnout and fire caused by foreign substances, natural discharge, deterioration of battery life and performance.

Recently, in order to solve this problem, a charging system (hereinafter referred to as "" wireless charging system ") and a control method using a method of transmitting power wirelessly have been proposed. In addition, the wireless charging system was not basically installed in some portable terminals in the past, and the consumer had to separately purchase a wireless charging receiver accessory, so the demand for the wireless charging system was low, but wireless charging users are expected to increase rapidly. It is expected to be equipped with wireless charging function.

In general, the wireless charging system is composed of a wireless power transmitter for supplying electrical energy in a wireless power transmission method and a wireless power receiver for charging the battery by receiving the electrical energy supplied from the wireless power transmitter.

The wireless power transmitter requires a power supply unit, a voltage conversion unit, a transmission coil, etc. to generate and convert power required for a battery, and thus has a problem of being bulky and expensive to manufacture.

Recently, a single wireless power transmitter has been designed to charge batteries of different sizes.

Therefore, there is an urgent need to develop a wireless power transmitter capable of efficiently charging batteries having different sizes at low cost.

The embodiment aims to solve the above and other problems.

Another object of the embodiment is to provide a wireless charging device capable of charging a battery having a different size from each other.

Another object of the embodiment to provide a wireless charging device capable of low cost.

Another object of the embodiment to provide a wireless charging device capable of minimizing the size.

According to an aspect of the embodiment to achieve the or another object, the wireless charging device, the first shield including a first area and a second area; A first coil module disposed on the first region of the first shielding portion; A second shield disposed on the second area of the first shield; And a second coil module disposed on the second shield. The second coil module may include a region overlapping with the first coil module in a vertical direction.

The effect of the wireless charging device according to the embodiment is as follows.

According to at least one of the embodiments, since the first coil module and the second coil module are partially overlapped, there is an advantage that the size of the coil unit can be reduced.

According to at least one of the embodiments, by arranging the first coil module and the second coil module to partially overlap, the arrangement structure of the first coil module and the second coil module is not only optimized but also made by the first coil module. Partial area of the 2 coil module is supported, there is an advantage that the support stability of the second coil module can be secured.

According to at least one of the embodiments, by placing at least two coil modules on the same shield, it is possible not only to charge batteries of different sizes, but also to efficiently charge batteries having different sizes at low cost. There is an advantage.

Further scope of the applicability of the embodiments will become apparent from the detailed description below. However, various changes and modifications within the spirit and scope of the embodiments can be clearly understood by those skilled in the art, and therefore, specific embodiments, such as the detailed description and the preferred embodiments, are to be understood as given by way of example only.

1 is a block diagram illustrating a wireless charging system according to an embodiment.
2 is a block diagram showing the structure of a wireless power transmitter according to an embodiment.
3 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter of FIG. 2.
4 is an exploded perspective view of the wireless charging device according to the embodiment.
5 is a perspective view showing a coil unit according to an embodiment.
6 is an exploded perspective view showing a coil unit according to the embodiment.
7 is a plan view of the coil unit according to the embodiment.
8 is a front view illustrating the coil unit according to the embodiment.
9 illustrates a heat dissipation plate according to an embodiment.
10 shows a first coil module according to an embodiment.
11 illustrates a state in which the first coil module and the second coil coil overlap with each other according to the embodiment.
12 to 16 illustrate the assembly process of the coil unit according to the embodiment.

Hereinafter, an apparatus and various methods to which the embodiments are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the foregoing description, the present invention is not necessarily limited to these embodiments, although all of the components constituting the embodiments are described as being combined or operating in combination. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing the embodiments. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In the description of the embodiments, in the case of being described as being formed at "up (up) or down (down)", "before (front) or back (back)" of each component, "up (up) or down (Below) " and " before (front) or back (back) " include both formed by direct contact of two components or one or more other components disposed between two components.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art with respect to the related well-known technology, the detailed description thereof will be omitted.

In the description of the embodiment, the device for transmitting wireless power on the wireless power charging system is a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a wireless power transmitter, wireless power transmission for convenience of description. I will use a combination of wireless charging device. In addition, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver terminal, etc. may be used interchangeably as a representation of an apparatus for receiving wireless power from a wireless power transmitter.

Wireless charging apparatus according to the embodiment may be configured in the form of a pad, a cradle, an access point (AP), small base station, stand (stand), ceiling buried, wall-hung, etc., one transmitter is a plurality of Power may be transmitted to the wireless power receiver.

For example, the wireless power transmitter may not only be used on a desk or table or the like, but may also be developed for an automobile and used in a vehicle. The wireless power transmitter installed in the vehicle may be provided in the form of a cradle that can be fixed and mounted easily and stably.

Terminal according to the embodiment is a mobile phone (smart phone), smart phone (smart phone), laptop computer (laptop computer), digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in small electronic devices such as toothbrushes, electronic tags, lighting devices, remote controls, fishing bobbers, and the like, but is not limited thereto, and is a mobile device device (hereinafter, referred to as a "device") equipped with a wireless power receiver according to an embodiment to charge a battery. The term "terminal" or "device" may be used interchangeably. The wireless power receiver according to another embodiment may be mounted in a vehicle, an unmanned aerial vehicle, an air drone, or the like.

The wireless power receiver according to the embodiment may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Herein, the wireless power transmission method may include at least one of an electromagnetic induction method, an electromagnetic resonance method, and an RF wireless power transmission method. In particular, the wireless power receiver supporting the electromagnetic induction method may include the electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and Air Fuel Alliance (formerly PMA, Power Matters Alliance). have. In addition, the wireless power receiver supporting the electromagnetic resonance method may include a resonant wireless charging technology defined in the Air Fuel Alliance (formerly A4WP, Alliance for Wireless Power) standard organization, which is a wireless charging technology standard organization.

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

1 is a block diagram illustrating a wireless charging system according to an embodiment.

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

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission. As another example, the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication for exchanging information using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.

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

In-band communication and out-of-band communication may provide bidirectional communication, but are not limited thereto. In another embodiment, in-band communication and out-of-band communication may provide one-way communication or half duplex communication.

 For example, the unidirectional communication may be that the wireless power receiver 20 transmits information only to the wireless power transmitter 10, but is not limited thereto. The wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.

The half-duplex communication method is a communication set up such that bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but only one device can transmit information at any one time.

The wireless power receiver 20 according to the embodiment may obtain various state information of the electronic device 30. For example, the state information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, and the like. The information may be obtained from the electronic device 30 and may be utilized for wireless power control.

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

Referring to FIG. 2, the wireless power transmitter 200 is largely comprised of a power converter 210, a power transmitter 220, a wireless charging communication unit 230, a controller 240, a sensing unit 250, and a near field communication unit ( 270 and the wireless communication coil 280 may be configured. Note that the above-described configuration of the wireless power transmitter 200 is not necessarily an essential configuration, and may include more or fewer components.

As shown in FIG. 2, when power is supplied from the power supply unit 260, the power converter 210 may perform a function of converting the power into power of a predetermined intensity.

To this end, the power converter 210 may include a DC / DC converter 211 and an amplifier 212.

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

In this case, the sensing unit 250 may measure the voltage / current of the DC-converted power and provide the same to the controller 240. For example, the controller 240 may adaptively block power supply from the power supply unit 250 or block power from being supplied to the amplifier 212 based on the voltage / current value measured by the sensing unit 250. Can be. In addition, the sensing unit 250 may measure the internal temperature of the wireless power transmitter 200 to determine whether overheating occurs, and provide the measurement result to the controller 240. More specifically, the sensing unit 250 may include one or more temperature sensors. One or more temperature sensors may measure the temperature of the transmission coil of the power transmitter 220. For example, the controller 240 may adaptively block power supply from the power supply unit 250 or block power from being supplied to the amplifier 212 based on the temperature value measured by the sensing unit 250. . To this end, one side of the power converter 210 may further include a power cutoff circuit for cutting off the power supplied from the power supply unit 250 or cutting off the power supplied to the amplifier 212. As another example, the controller 240 may adjust the intensity of the power provided to the power transmitter 220 based on the temperature value measured by the sensor 250. Thus, the wireless power transmitter 200 according to the embodiment can prevent the internal circuit from being damaged due to overheating.

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

The power transmitter 220 may include a multiplexer 221 (or multiplexer) and 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 be configured to include first to nth transmission coils. In addition, the power transmitter 220 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission. It may also include.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 212 received through the multiplexer 221 into 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 only one embodiment, and the other example is before the amplifier 212. Note that it may be mixed in stages or later.

When a plurality of wireless power receivers are connected, the controller 240 may transmit power through time division multiplexing for each transmission coil. For example, in the wireless power transmitter 200, three wireless power receivers, that is, the first to third wireless power receivers, are identified through three different transmission coils, that is, the first to third transmission coils, respectively. The controller 240 may control the multiplexer 221 to control power to be transmitted through a specific transmission coil in a specific time slot. In this case, the amount of power transmitted to the corresponding wireless power receiver may be controlled according to the length of time slots allocated for each transmission coil. However, this is only one embodiment. Another example is for a time slot allocated for each transmission coil. By controlling the amplification rate of the amplifier 212 of the wireless power receiver can also control the transmission power.

The controller 240 may control the multiplexer 221 to sequentially transmit the detection signals through the first to nth transmission coils 222 during the first detection signal transmission procedure. At this time, the control unit 240 may identify the time when the detection signal is transmitted using the timer 255. When the detection signal transmission time arrives, the control unit 240 controls the multiplexer 221 to detect the detection signal through the corresponding transmission coil. Can be controlled to be sent. For example, the timer 255 may transmit a specific event signal to the controller 240 at a predetermined period during the ping transmission step. When the corresponding event signal is detected, the controller 240 controls the multiplexer 221 to correspond to the event signal. The digital coil can be controlled through the transmission coil.

In addition, the control unit 240 through the transmission coil identifier and the corresponding transmission coil for identifying which transmission coil received a signal strength indicator from the demodulator 232 during the first detection signal transmission procedure The received signal strength indicator may be received. Subsequently, in the second detection signal transmission procedure, the control unit 240 controls the multiplexer 221 to transmit the detection signal only through the transmission coil (s) in which the signal strength indicator is received during the first detection signal transmission procedure. You may. As another example, the controller 240 transmits the second detection signal to the transmission coil in which the signal strength indicator having the largest value is received when the signal strength indicator has a plurality of transmission coils received during the first detection signal transmission procedure. In the procedure, the detection signal may be determined as the 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 is a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a pulse width modulation scheme, a differential 2 Differential bi-phase modulation schemes may be included, but is not limited thereto.

When a signal received through the transmission coil is detected, the demodulator 232 may demodulate the detected signal and transmit the demodulated signal to the controller 240. 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 (EOC) indicator, an overvoltage / overcurrent / overheat indicator, and the like. However, the present invention is not limited thereto, and may include various state information for identifying a state of the wireless power receiver.

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

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

In addition, the wireless power transmitter 200 may not only transmit wireless power using the transmission coil 222 but also exchange various information with the wireless power receiver through the transmission coil 222. As another example, the wireless power transmitter 200 further includes a separate coil corresponding to each of the transmission coils 222, that is, the first to nth transmission coils, and wireless power using the separate coils provided. Note that in-band communication with the receiver may also be performed.

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 a frequency band used for wireless power signal transmission. For example, the short-range bidirectional communication may be a near field communication (NFC) method. NFC is one of Radio Frequency IDentification (RFID) technologies, which uses a frequency of 13.56 MHz to exchange various wireless data within a short distance of 10 cm.

In addition, the wireless power transmitter 200 may include a wireless communication coil 280 that transmits and receives a signal used when the wireless power receiver communicates with the wireless power receiver in short distance.

3 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter of FIG. 2.

Referring to 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, It may be configured to include a wireless charging communication unit 360, the main control unit 370, a short-range communication unit 380, a wireless communication coil 390. Herein, the wireless charging communication unit 360 may include at least one of a demodulator 361 and a modulator 362.

In addition, the wireless power receiver 300 may include a short range communication unit 380. The short range communication unit 380 may perform short range bidirectional communication through a frequency band different from a frequency band used for wireless power signal transmission. For example, the short-range bidirectional communication may be a near field communication (NFC) method. NFC is one of Radio Frequency IDentification (RFID) technologies, which uses a frequency of 13.56 MHz to exchange various wireless data within a short distance of 10 cm.

In addition, the wireless power receiver 300 may include a wireless communication coil 390 for transmitting and receiving a signal used when the wireless power transmitter 200 performs short-range communication with the wireless power transmitter 200.

The AC power received through the wireless charging coil module 310 may be transferred to the rectifier 320. The rectifier 320 may convert AC power into DC power and transmit the DC power to the DC / DC converter 330. The DC / DC converter 330 may convert the strength of the rectifier output DC power into a specific intensity required by the load 340 and then transmit the converted power to the load 340. In addition, the wireless charging coil module 310 may be configured to include a plurality of receiving coils (not shown), that is, the first to n-th receiving coil. According to an embodiment, frequencies of AC power delivered to each receiving coil (not shown) may be different from each other, and another embodiment may include a frequency controller having a function of differently adjusting LC resonance characteristics for each receiving coil. It is also possible to set different resonant frequencies for each receiving coil.

The sensing unit 350 may measure the intensity of the rectifier 320 output DC power and provide the same to the main controller 370. In addition, the sensing unit 350 may measure the strength of the current applied to the receiving coil 310 according to the wireless power reception, and transmit the measurement result to the main control unit 370. For example, the main controller 370 may determine whether the overvoltage occurs by comparing the measured intensity of the rectifier output DC power with a preset reference value. As a result of the determination, when the overvoltage is generated, a packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 362. Here, the signal modulated by the modulator 362 may be transmitted to the wireless power transmitter 200 through the receiving coil 310 or a separate coil (not shown). In addition, when the intensity of the rectifier output DC power is greater than or equal to the reference value, the main controller 370 may determine that a detection signal has been received. When the detection signal is received, a signal strength indicator corresponding to the detection signal may be modulated. It can be controlled to be transmitted to the wireless power transmitter 200 through. As another example, the demodulator 361 demodulates an AC power signal or a rectifier 320 output DC power signal between the receiving coil 310 and the rectifier 320 to identify whether a detection signal is received, and then, the main subject of the identification result. The unit 370 may be provided. In this case, the main controller 370 may control the signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 362. In addition, the sensing unit 350 may measure the internal temperature of the wireless power receiver 300 and provide the measured temperature value to the main controller 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 controller 370 may determine whether the measured internal temperature is overheated by comparing with the reference value. As a result of determination, when overheating occurs, a packet indicating that overheating has occurred may be generated and transmitted to the modulator 362. Here, the signal modulated by the modulator 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 charging device according to an embodiment.

The wireless charging device may be a wireless power transmitter (10 in FIG. 1, 200 in FIG. 2), but may also be applied to a wireless power receiver.

Referring to FIG. 4, the wireless charging device according to an embodiment may include a bracket 400, a substrate 500, and a coil unit 600. It should be noted that the above-described configuration of the wireless charging device is not necessarily an essential configuration and may include more or fewer components.

The bracket 400 serves to fix and support the components disposed thereon, for example, the substrate 500 and the coil unit 600. The bracket 400 may include a plurality of seating portions 403 protruding upward from the bottom surface 401. Thus, the seating portion 403 may be spaced apart from the bottom surface 401 by a predetermined distance.

The substrate 500 may be disposed on the bracket 400. The substrate 500 may be fastened to the mounting portion 403 of the bracket 400. The substrate 500 may be a printed circuit board (PCB) or a flexible printed circuit board (FPCB), but is not limited thereto. The substrate 500 may be fastened to the bracket 400. That is, the substrate 500 and the bracket 400 may be fastened by using bolts such as screws.

Various circuit parts for driving or controlling the coil unit 600 may be mounted on the bottom surface of the substrate 500. For example, the circuit unit includes a multiplexer 221 shown in FIG. 2, a wireless charging communication unit 230, a timer 255, a sensing unit 250, a control unit 240, and a wireless charging communication unit shown in FIG. 3 ( 360, the main control unit 370, and the sensing unit 350 are not limited thereto.

The substrate 500 is fastened to the seating portion 403 spaced a predetermined distance from the bottom surface 401 of the bracket 400, and by the separation distance between the substrate 500 and the seating portion 403 of the bracket 400 The circuit portion mounted on the bottom surface of the substrate 500 does not contact the bottom of the bracket 400.

The substrate 500 may have a rigid rectangular shape, but is not limited thereto. Therefore, the substrate 500 may support the coil unit 600 disposed on the upper surface. In addition, an area of the substrate 500 may be larger than that of the coil unit 600. The coil unit 600 may be fastened to the substrate 500 using bolts or fastened to the bracket 400 by penetrating the substrate 500.

The coil unit 600 may be disposed on the substrate 500. The coil unit 600 may include one or more coil modules 620 and 630. One or more coil modules 620 and 630 may be one or more transmission coils of the wireless power transmitter. In addition, each of the coil modules 620 and 630 may be arranged in one or more layers. The coil modules 620 and 630 will be described later in detail.

As such, the plurality of coil modules 620 and 630 are disposed to be partially overlapped on different layers to selectively drive the charging region, and thus the charging performance may be varied. Therefore, wireless charging can be performed efficiently regardless of the size or charging capacity of the battery for wireless power reception.

Although not shown, another substrate may be disposed on the coil unit 600. On the upper surface of the substrate, for example, a circuit unit such as the near field communication units 270 and 380 illustrated in FIG. 2 or 3 may be mounted. In addition, wireless communication coils 280 and 390 may be arranged in a pattern on the upper surface of the substrate. The wireless communication coils 280 and 390 may have at least one turn. Although not shown, both ends of the wireless communication coils 280 and 390 may be electrically connected to circuit units such as the short range communication units 270 and 380 through via holes. In addition, the circuit portion of the substrate may be electrically connected to the controller (240 of FIG. 2) or the main controller (370 of FIG. 3) mounted on the substrate 500 using, for example, a cable or a bus line.

5 is a perspective view illustrating a coil unit according to an embodiment, FIG. 6 is an exploded perspective view illustrating a coil unit according to an embodiment, FIG. 7 is a plan view illustrating a coil unit according to an embodiment, and FIG. 8 is an embodiment. It is a front view which shows the coil unit which concerns on an example. 9 illustrates a heat dissipation plate according to an embodiment, FIG. 10 shows a first coil module according to an embodiment, and FIG. 11 shows a state in which a first coil module and a second coil coil overlap with each other according to an embodiment. do.

Each of the first coil module 620 and the second coil module 630 included in the coil unit 600 may correspond to the first transmission coil and the second transmission coil shown in FIG. 2. Coil unit 600 according to the embodiment may be provided with a first to n-th coil module to correspond to the first to n-th transmission coil shown in FIG.

It should be noted that the components included in the coil unit 600 described below are not necessarily required, and may include more or fewer components.

<Shielding part 610>

The coil unit 600 according to the embodiment may provide a shield 610.

The shield 610 may be a member for shielding a magnetic field generated in each of the first coil module 620 and the second coil module 630. The shield 610 may be formed of, for example, a magnetic material such as ferrite, but is not limited thereto.

The shield 610 may include a first shield 612 and a second shield 614. The shield 610 of the coil unit 600 may be disposed on the substrate 500, as shown in FIG. 4. The second shield 614 may be disposed on the first shield 612. The first shield 612 and the second shield 614 may have different areas (or sizes) from each other. For example, the area of the second shield 614 may be smaller than the area of the first shield 612. Accordingly, when viewed from above, since the first shield 612 is not covered by the second shield 614, a portion of the first shield 612 may be exposed.

As illustrated in FIG. 7, the first shield 612 may have a first area A1 and a second area A2. In this case, an area of the first area A1 may be larger than that of the second area A2.

The first shield 612 may have a first width W1 along the first direction and a second width W2 along the second direction. The first direction and the second direction may be directions perpendicular to each other. The area of the first shield 612 may be defined by the product of the first width W1 and the second width W2. In this case, the area of the first shielding portion 612 may be the sum of the first area A1 and the second area A2. The second direction may be a vertical direction or a direction perpendicular to the first direction.

The area of the first area A1 of the first shield 612 may be defined as the product of the first width W1 and the fourth width W4. An area of the second area A2 of the first shielding part 612 may be defined as a product of the first width W1 and the third width W3. In this case, the second width W2 of the first shield 612 may be the sum of the third width W3 and the fourth width W4.

The second shield 614 may be disposed on the first shield 612. The second shield 614 may be disposed on the second area A2 of the first shield 612. The lower surface of the second shield 614 may contact the upper surface of the second area A2 of the first shield 612.

The area of the second shield 614 may be the same as the second area A2 of the first shield 612. Accordingly, the area of the second shield 614 may be defined as the product of the first width W1 and the third width W3.

In an embodiment, each of the first and second shields 612, 614 has a rectangular shape, but is not limited thereto. For example, the first shield 612 may have a square shape, and the second shield 614 may have a rectangular shape.

Since the area of the second shield 614 is smaller than that of the first shield 612, the shielding performance may be reduced. To compensate for this, the permeability of the second shield 614 may be greater than the permeability of the first shield 612. According to an embodiment, the permeability of the first shield 612 may be at least 40 Wb / A · m and the permeability of the second shield 614 may be at least 150 Wb / A · m. In addition, the thickness T1 of the second shield 614 may be greater than the thickness of the first shield 612. For example, the thickness of the first shield 612 may be at least 0.5 nm, and the thickness T1 of the second shield 614 may be at least 0.8 nm.

In particular, the thickness T1 of the second shield 614 may be set in consideration of the thickness T2 + T3 of the first coil module 620. For example, the thickness T1 of the second shield 614 may be the same as the thickness T2 + T3 of the first coil module 620, which will be described in detail later.

Coil Module

The coil unit 600 according to the embodiment may provide at least two or more coil modules 605. The coil module may include a first coil module 620 and a second coil module 630.

The first coil module 620 and the second coil module 630 may be disposed on the first shield 612. The first coil module 620 may be disposed on the first area A1 of the first shield 612. The lower surface of the first coil module 620 may contact the upper surface of the first area A1 of the first shielding part 612.

The second coil module 630 may be disposed on the second shield 614. Some regions of the second coil module 630 may be disposed on the second shield 614, and other portions of the second coil module 630 may be disposed on the first shield 612. A lower surface of a portion of the second coil module 630 may contact the upper surface of the second shield 614. Some other region of the second coil module 630 may be spaced apart from the first shield 612 by the thickness T1 of the second shield 614. That is, a space may be formed between the other partial region of the second coil module 630 and the second shield 614. In this space, for example, the first coil module 620 may be disposed. That is, a partial region of the first coil module 620 may be disposed in a space formed between the other partial region of the second coil module 630 and the second shield 614. Accordingly, another partial region of the second coil module 630 may be disposed to overlap with a partial region of the first coil module 620.

The first coil module 620 may include a first coil part 622, a second coil part 624, and a third coil part 626. As illustrated in FIG. 7, the first to third coil units 622, 624, and 626 may be disposed to partially overlap each other. For example, the first coil part 622 and the second coil part 624 are arranged to be in contact with each other horizontally to form a first layer, and the third coil part 626 is a second layer as a first coil part ( A portion of 622 and a portion of the second coil unit 624 may overlap. In this case, the first coil part 622, the third coil part 626, and the second coil part 624 may be arranged side by side in the first direction. Each of the first to third coil parts 622, 624, and 626 may include a hollow part 622a, 624a, and 626a having an empty center. Each of the first to third coil units 622, 624, and 626 may include, for example, a plurality of coils wound in a clockwise direction. The outer surface of each coil can be coated with an insulating material or covered with an insulating layer.

The second coil module 630 may include a first coil part 632, a second coil part 634, and a third coil part 636. The first to third coil parts 632, 634, and 636 may be disposed to partially overlap each other. For example, the first coil part 632 and the second coil part 634 are arranged to be in contact with each other horizontally to form a first layer, and the third coil part 636 is a second layer as a first coil part ( A portion of the 632 and a portion of the second coil unit 634 may overlap. In this case, the first coil part 632, the third coil part 636, and the second coil part 634 may be arranged side by side in the first direction. Each of the first to third coil parts 632, 634, and 636 may include a hollow part 632a, 634a, and 636a having an empty center. Each of the first to third coil parts 632, 634, and 636 may include, for example, a plurality of coils wound in a clockwise direction. The outer surface of each coil can be coated with an insulating material or covered with an insulating layer.

The first coil module 620 and the second coil module 630 may be arranged to partially overlap each other along the second direction (vertical direction), for example. For example, the first coil part 632 of the second coil module 630 may be disposed to vertically overlap the first coil part 622 and the third coil part 626 of the first coil module 620. . For example, the second coil part 634 of the second coil module 630 may be disposed to vertically overlap the second coil part 624 and the third coil part 626 of the first coil module 620. . For example, an upper surface of the third coil unit 626 of the first coil module 620 may be a portion of the upper surface of the first coil unit 632 of the second coil module 630 and a portion of the upper surface of the second coil unit 634. It may be placed in contact with.

As illustrated in FIG. 7, the first shield 612 may have a third region A3. The third area A3 may be a partial area of the predefined first area A1. The third area A3 is positioned at the center of the first shield 612 and may be defined as a center area. An overlapping area OA may be defined in which the first coil module 620 and the second coil module 630 partially overlap. In this case, the overlap region may overlap the third region A3 of the first shield 612 in the vertical direction.

Some areas of the first coil part 622 of the first coil module 620 may be located in the hollow part 632a of the first coil part 632 of the second coil module 630. Some regions of the second coil part 624 of the first coil module 620 may be located in the hollow part 634a of the second coil part 634 of the second coil module 630.

The thickness T1 of the second shield 614 may be the same as the thickness T2 + T3 of the first coil module 620. The thickness T1 of the second shield 614 is the total thickness that is the sum of the thickness T2 of the first coil part 622 of the first coil module 620 and the thickness T3 of the third coil part 626. Alternatively, the total thickness may be equal to the sum of the thickness T2 of the second coil part 624 and the thickness T3 of the third coil part 626. As described above, since the thickness T1 of the second shield 614 is the same as the thickness T2 + T3 of the first coil module 620, the second coil module disposed on the second shield 614 ( A lower surface of a portion of the region 630 may contact the upper surface of the first coil module 620.

As shown in FIG. 10, the outer diameter D2 of the first coil part 622 or the second coil part 624 of the first coil module 620 is the outer diameter D1 of the third coil part 626. ), But is not limited thereto.

Although not shown, the outer diameter of the first coil part 632 or the second coil part 634 in the second coil module 630 may be larger than the outer diameter of the third coil part 636, but the present invention is not limited thereto. I never do that.

The width of the short side of the first coil module 620 may be greater than the width of the short side of the second shield 614. The width of the short side of the second coil module may be greater than the width of the short side of the second shield 614.

The short side surface of the first coil module 620, the short side surface of the second coil module 630, and the short side surface of the second shielding part 614 may be side surfaces defined along the second direction. The width of the short side surface of the first coil module 620 may have a width smaller than the long side surface of the first coil module 620 defined along the first direction. The width of the short side surface of the second coil module 630 may have a width smaller than the long side surface of the second coil module 630 defined along the first direction. The width W3 of the short side surface of the second shield 614 may have a width smaller than the width W1 of the long side surface of the second shield 614 defined along the first direction.

The number of coil turns of the second coil module 630 may be greater than the number of coil turns of the first coil module 620. For example, the number of turns of the first coil module 620 may be 11 and the number of turns of the second coil module 630 may be 12.

The area of the first coil module 620 may be larger than the area of the second coil module 630, but is not limited thereto. The area of the first coil module 620 is the total area of the first to third coil parts 622, 624, 626, and the area of the second coil module 630 is the first to third coil parts 632, 634. , 636). An area of the first coil unit 622 of the first coil module 620 may be larger than an area of the first coil unit 632 of the second coil module 630. An area of the second coil unit 624 of the first coil module 620 may be larger than an area of the second coil unit 634 of the second coil module 630. An area of the third coil unit 626 of the first coil module 620 may be larger than an area of the third coil unit 636 of the second coil module 630.

The thickness of the second coil module 630 may be greater than the thickness T2 + T3 of the first coil module. For example, the thickness of the first coil part 632 of the second coil module 630 may be greater than the thickness T2 of the first coil part 632 of the second coil module 630. For example, the thickness of the second coil part 634 of the second coil module 630 may be greater than the thickness T2 of the second coil part 624 of the first coil module 620. For example, the thickness of the third coil part 636 of the second coil module 630 may be greater than the thickness T3 of the third coil part 626 of the first coil module 620.

The second shield 614 and the first coil module 620 may be arranged on the same line. That is, the second shield 614 and the first coil module 620 may be disposed on the first shield 612. The lower surface of the second shield 614 and the lower surface of the first shield 612 may contact the upper surface of the first shield 612.

An inner surface of the second shield 614 may be in contact with a portion of the outer surface of the first coil module 620, but the embodiment is not limited thereto. That is, the inner surface of the second shield 614 is part of the outer surface of each of the first coil portion 622, the second coil portion 624, and the third coil portion 626 of the first coil module 620. Can touch the area.

According to the embodiment, the first coil module 620 and the second coil module 630 are disposed to partially overlap, thereby reducing the size of the coil unit 600.

According to the embodiment, the first coil module 620 and the second coil module 630 are arranged to partially overlap, thereby optimizing the arrangement of the first coil module 620 and the second coil module 630. In addition, a partial region of the second coil module 630 may be supported by the first coil module 620 to ensure the support stability of the second coil module 630.

According to the embodiment, at least two or more coil modules are disposed on the same shield 610, so that not only the batteries of different sizes can be charged but also the batteries of different sizes can be efficiently charged at low cost. .

<Heat radiating plate>

The coil unit 600 according to the embodiment may include a heat dissipation plate 640.

The heat dissipation plate 640 may be referred to as a heat exchanger, a heat exchange member, a cooling member, a cooling plate, a heat dissipation member, a heat dissipation sheet, and the like.

The heat dissipation plate 640 may be disposed under the shield 610. The heat dissipation plate 640 may be disposed under the first shield 612. The heat dissipation plate 640 may be in contact with the bottom surface of the first shield 612. The heat dissipation plate 640 may have a sheet or tape form.

Although the first shield 612 and the heat dissipation plate 640 are shown to have the same area in the drawing, the embodiment is not limited thereto. For example, the area of the heat radiation plate 640 may be larger than the area of the first shield 612. That is, the side surface of the heat dissipation plate 640 may further protrude along at least two or more horizontal directions from the side surface of the first shield 612.

The bottom surface of the heat dissipation plate 640 may be in contact with the top surface of the substrate 500. At least one region of the heat dissipation plate 640 may be connected to the bracket 400. Accordingly, heat generated in the first and second coil modules 620 and 630 may be discharged through the heat dissipation plate 640 through the substrate 500 or the bracket 400.

The heat dissipation play may be made of a material having high thermal conductivity or thermal emissivity. For example, the heat dissipation plate 640 may be made of a metal material such as aluminum (Al) or an alloy material such as an aluminum alloy. For example, the heat dissipation plate 640 may be made of a resin material such as epoxy or silicon. For example, the heat dissipation plate 640 may be made of a graphene material.

The heat dissipation plate 640 may include first and second grooves 642 and 644 formed on the first side and the second side, respectively. The first and second grooves 642 and 644 of the heat dissipation plate 640 may be disposed to face each other at the first and second sides of the heat dissipation plate 640, but are not limited thereto. The first groove 642 may have a shape toward the inside of the heat dissipation plate 640, that is, the second side, and the second groove 644 may have a shape inside the heat dissipation plate 640, that is, toward the first side. have. When viewed from above, the first and second grooves 642 and 644 may have an open side and open up and down.

In the drawing, the first and second grooves 642 and 644 have an angular shape into which they enter, but may be rounded without being angled.

First and second connectors 650 and 660 may be disposed in the first and second grooves 642 and 644 of the heat dissipation plate 640, respectively.

<First and second connectors 650 and 660>

The coil unit 600 according to the embodiment may provide the first and second connectors 650 and 660.

Each of the first and second connectors 650 and 660 may be disposed on the first and second sides of the heat dissipation plate 640. For example, the first connector 650 may be disposed in the first groove 642 of the heat dissipation plate 640, and the second connector 660 may be disposed in the second groove 644 of the heat dissipation plate 640. Each of the first and second connectors 650 and 660 may be fastened to the heat dissipation plate 640. Each of the first and second connectors 650 and 660 may be fastened to the substrate 500. That is, each of the first and second connectors 650 and 660 may be fastened to the substrate 500 and inserted into each of the first and second grooves 642 and 644 of the heat dissipation plate 640.

The first connector 650 may include a substrate 652, a first contact terminal 654, and a second contact terminal 656. The substrate 652 may support the first contact terminal 654 and the second contact terminal 656 and electrically connect the first contact terminal 654 and the second contact terminal 656. The first contact terminal 654 may be disposed on the substrate 652 and the second contact terminal may be disposed below the substrate 652. The first contact terminal 654 may include a plurality of pins. Each of the plurality of pins of the first contact terminal 654 may be electrically connected to the first to third coil modules 622, 624, and 626 of the first coil module 620. The second contact terminal 656 may include a plurality of pins. The plurality of pins of the second contact terminal 656 may be electrically connected to the circuit portion of the substrate 500.

The second connector 660 may include a substrate 662, a first contact terminal 664, and a second contact terminal 666. The substrate 662 may support the first contact terminal 664 and the second contact terminal 666 and electrically connect the first contact terminal 664 and the second contact terminal. The first contact terminal 664 may be disposed on the substrate 662 and the second contact terminal 666 may be disposed below the substrate 662. The first contact terminal 664 may include a plurality of pins. Each of the plurality of pins of the first contact terminal 664 may be electrically connected to the first to third coil modules 632, 634, and 636 of the second coil module 630. The second contact terminal 666 may include a plurality of pins. The plurality of pins of the second contact terminal 666 may be electrically connected to the circuit portion of the substrate 500.

12 to 16 illustrate the assembly process of the coil unit according to the embodiment.

As shown in FIG. 12, a heat radiating plate 640 may be prepared. The first and second connectors 650 and 660 may be fastened to the first and second grooves 642 and 644 of FIG. 9 formed on the first and second sides of the heat dissipation plate 640.

As shown in FIG. 13, the first shield 612 may be disposed on the heat dissipation plate 640.

As illustrated in FIG. 14, the second shield 614 may be disposed on one region (A2 of FIG. 7) of the first shield 612. The shield 610 may be configured by the first shield 612 and the second shield 614.

As shown in FIG. 15, the first coil module 620 including the first to third coil parts 622, 624, and 626 is positioned on another region (A1 of FIG. 7) of the first shielding part 612. Can be placed in. In this case, the second shield 614 and the first coil module 620 may be disposed on the same line.

As illustrated in FIG. 16, a second coil module 630 including first to third coil parts 632, 634, and 636 may be disposed on the first shielding part 612. In detail, the second coil module 630 may be disposed on another region (A1 of FIG. 7) of the second shield 614 and the first shield 612. Accordingly, some regions of the second coil module 630 may be disposed to vertically overlap with the first coil module 620.

As described above, the coil unit 600 may be manufactured through an assembly process as shown in FIGS. 12 to 16. The coil unit 600 manufactured as described above may be disposed on the substrate 500 as a modular component to configure a wireless charging device.

In the above description, the first and second connectors 650 and 660 are directly fastened to the heat dissipation plate 640, but other embodiments are possible. That is, after the first and second connectors 650 and 660 are fastened to the first and second sides of the substrate 500 in advance, the first and second shields 612 and 614 and the first and second coils. The heat dissipation plate 640 on which the modules 620 and 630 are disposed may be fastened to the substrate 500. In this case, each of the first and second connectors 650 and 660 fastened to the substrate 500 may be inserted into the first and second grooves 642 and 644 of FIG. 9.

As another example, the first and second grooves 642 and 644 of FIG. 9 are not formed in the heat radiation plate 640, and the substrates of the first and second connectors 650 and 660 (652 and 662 of FIG. 5). One region of may be fastened to the lower portion of the heat dissipation plate 640. If necessary, one region of the substrates 652 and 662 of the first and second connectors 650 and 660 fastened to the lower portion of the heat radiating plate 640 may be fastened to the upper surface of the substrate 500.

The foregoing detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the embodiments should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the embodiments are included in the scope of the embodiments.

400: bracket
401: bottom surface
403: seating part
500: substrate
600: coil unit
605, 620, 630: coil module
622, 624, 626, 632, 634, 636: coil part
610, 612, 614: shield
640: heat dissipation plate
642, 644: Home
650, 660: connector
652, 662: substrate
654, 656, 664, 666: contact terminal
A1: first area
A2: second area
A3: third area
OA: Overlap Area
W1, W2, W3, W4: Width
T1, T2, T3: thickness

Claims (26)

A first shield comprising a first region and a second region;
A first coil module disposed on the first region of the first shielding portion;
A second shield disposed on the second area of the first shield; And
And a second coil module disposed on the second shield.
The second coil module includes a region overlapping with the first coil module in a vertical direction. The method of claim 1,
The overlapping area is a wireless charging device that does not overlap in the vertical direction with the second shield. The method of claim 1,
The overlapping area is a wireless charging device overlapping in the vertical direction with the central area of the first shield. The method of claim 1,
The first coil module and the second coil module has a different number of winding wireless charging device. The method of claim 1,
Wireless charging device having a width of the short side surface of the first coil module is larger than the width of the short side surface of the second shield. The method of claim 1,
Wireless charging device having a different permeability of the first shield and the second shield. The method of claim 1,
Wireless charging device having the same thickness as the first coil module and the second shield. The method of claim 1,
Wireless charging device having a different area than the first shielding portion and the second shielding portion. The method of claim 1,
The first coil module,
First and second coil parts disposed on the first area of the first shielding part; And
Wireless charging device comprising a third coil portion disposed to overlap with a portion of each of the first and second coil portion. The method of claim 9,
The second coil module,
First and second coil parts partially overlapping with the second shielding part, and other parts overlapping with the first coil module; And
Wireless charging device comprising a third coil portion disposed to overlap with a portion of each of the first and second coil portion. The method of claim 10,
The second shield portion has a thickness equal to the overall thickness of the first coil portion and the third coil portion of the first coil module. The method of claim 10,
The second shield portion has a thickness equal to the overall thickness of the second coil portion and the third coil portion of the first coil module. The method of claim 10,
And the first coil part of the second coil module includes a region vertically overlapping the first coil part and the third coil part of the first coil module. The method of claim 10,
And the second coil part of the second coil module includes an area vertically overlapping the second coil part and the third coil part of the first coil module. The method of claim 10,
The upper surface of the third coil portion of the first coil module is a wireless charging device in contact with each of the upper portion of the first coil portion and the upper portion of the second coil portion of the second coil module. The method of claim 10,
Wireless charging device is located in the hollow portion of the first coil portion of the second coil module of the first coil module of the first coil module. The method of claim 10,
Wireless charging device is located in the hollow portion of the second coil portion of the second coil module of the first coil module. The method of claim 1,
Wireless charging device having an area of the first coil module is larger than the area of the second coil module. The method of claim 1,
The thickness of the second coil module is a wireless charging device larger than the thickness of the first coil module. The method of claim 1,
The number of turns of the second coil module is a wireless charging device larger than the number of turns of the first coil module. The method of claim 1,
Wireless permeability of the second shield is greater than the magnetic permeability of the first shield. The method of claim 1,
The second shield and the first coil module is a wireless charging device disposed on the same line. The method of claim 1,
Wireless charging device further comprises a heat radiation plate under the first shield. The method of claim 23, wherein
The heat dissipation plate,
Wireless charging device comprising a first and a second groove disposed on each of one side and the other side. The method of claim 24,
The wireless charging device further comprises a first connector and a second connector disposed in each of the first and second grooves. The method of claim 1,
A substrate including a circuit unit disposed below the first shield; And
Wireless charging device further comprising a bracket coupled to the substrate.