WO2018131944A1 - Coil device and wireless power transmission/reception device comprising same - Google Patents

Abstract

The present invention relates to a coil device and a wireless power transmission/reception device comprising same. The coil device, according to one embodiment, may comprise: a first coil arranged on a first layer; and a second coil which is the upper part of the first coil, is arranged on a second layer and extends from the first coil.

Description

Wireless power transceiver including coil device and coil device

The present invention relates to a wireless power transmission and reception device including a coil device and a coil 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 a "wireless charging system") and a control method using a method of transmitting power wirelessly have been proposed. In addition, since the wireless charging system was not pre-installed in some portable terminals in the past and the consumer had to separately purchase a wireless charging receiver accessory, the demand for the wireless charging system was low, but the number of wireless charging users is expected to increase rapidly. It is expected to be equipped with wireless charging function.

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

The wireless charging system may transmit power by at least one wireless power transmission method (eg, electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method, etc.).

For example, the wireless power transmission scheme may use various wireless power transmission standards based on an electromagnetic induction scheme that generates a magnetic field in the power transmitter coil and charges using an electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field. . Here, the electromagnetic induction wireless power transmission standard may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and Air Fuel Alliance (formerly PMA, Power Matters Alliance).

As another example, the wireless power transmission method may use an electromagnetic resonance method of transmitting power to a wireless power receiver located in close proximity by tuning a magnetic field generated by a transmission coil of the wireless power transmitter to a specific resonance frequency. . Here, the electromagnetic resonance method may include a wireless charging technology of the resonance method defined in the Air Fuel Alliance (formerly A4WP, Alliance for Wireless Power) standard mechanism which is a wireless charging technology standard mechanism.

As another example, the wireless power transmission method may use an RF wireless power transmission method that transmits power to a wireless power receiver located at a far distance by putting energy of low power in an RF signal.

On the other hand, as the wireless charging function is mounted in various devices, and as the strength of the power required by the wireless power receiver increases, heat generation may occur in a coil through which wireless power is transmitted and received, and the device may be damaged.

The present invention has been devised to solve the above-described problems of the prior art, and an object of the present invention is to provide a wireless power transmission and reception device including a coil device and a coil device.

In addition, the present invention provides a wireless power transmission and reception device including a coil device and a coil device having excellent heat dissipation efficiency.

In addition, the present invention is to provide a wireless power transmission and reception apparatus including a coil device and a coil device having excellent wireless power transmission efficiency.

In addition, the present invention is to provide a wireless power transmission and reception device comprising a simple coil device and a coil device.

In addition, the present invention provides a wireless power transmission and reception device including a coil device and a coil device having a plurality of charging directions.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to solve the above technical problem, the coil device according to the embodiment includes a first coil disposed in the first layer; And a second coil disposed above the first coil and extending from the first coil.

In addition, the coil device according to the embodiment may further include a first adhesive layer disposed between the first coil and the second coil.

In addition, in the coil device according to the embodiment, the first adhesive layer may include a coil hole, and the first coil and the second coil may be connected through the coil hole.

In addition, in the coil device according to the embodiment, the first adhesive layer may be an adhesive or an adhesive member.

In addition, the coil device according to the embodiment includes a first extension line extending from the first coil; And a second extension line extending from the second coil, wherein the first extension line and the second extension line may be disposed in the same area.

In addition, in the coil device according to the embodiment, the first coil may include coil wires spaced apart from each other, and the second coil may include coil wires spaced apart from each other.

In addition, in the coil device according to the embodiment, the first coil and the second coil may be disposed to cross.

In addition, the coil device according to the embodiment may be arranged so that the first coil and the second coil do not overlap.

In the coil device according to the embodiment, the first coil and the second coil may overlap each other.

In addition, the coil device according to the embodiment includes a substrate; And a shield disposed on the substrate, wherein the first coil may be disposed on the shield.

In addition, the coil device according to the embodiment may further include a shielding material disposed between the first coil and the second coil.

In addition, in the coil device according to the embodiment, the first coil and the second coil may be disposed in parallel.

In addition, the coil device according to the embodiment includes a first shielding material disposed on the first coil; A heat radiation sheet disposed on the first shielding material; And a second shielding material disposed on the heat dissipation sheet and disposed under the second coil.

In addition, the coil device according to the embodiment may have the same shape of the first coil and the second coil.

In addition, in the coil device according to the embodiment, the shape of the first coil and the second coil may not be the same.

In addition, the coil device according to the embodiment may have the same number of turns of the first coil and the second coil.

In addition, in the coil device according to the embodiment, the number of turns of the first coil and the second coil may not be the same.

In addition, in the coil device according to the embodiment, the turn direction of the first coil and the turn direction of the second coil may not be the same.

In accordance with another aspect of the present invention, there is provided a wireless power transmission apparatus comprising: a coil device including a first coil disposed on a first layer, and a second coil disposed above and extending from the first coil on the second layer; And a drive circuit connected to the coil.

In addition, the wireless power receiver according to the embodiment includes a coil device including a first coil disposed on a first layer and a second coil on top of the first coil and extending from the first coil; And a control circuit connected to the coil.

Referring to the effects on the coil device and the wireless power transceiver including the coil device according to the present invention.

The present invention can provide a wireless power transmission and reception device including a coil device and a coil device.

In addition, the present invention can provide a coil device having excellent heat dissipation efficiency.

In addition, the present invention can provide a coil device having excellent wireless power transmission efficiency.

In addition, the present invention can provide a coil device having a simple structure.

In addition, the present invention can provide a coil device having a plurality of charging directions.

In addition, the present invention can have a wider charging area by using a plurality of transmission coils, and thus user convenience is high.

In addition, the present invention can use only one of a plurality of the same circuit can reduce the size of the wireless power transmitter itself, it is possible to reduce the cost of the components used.

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

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention with detailed description. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute new embodiments.

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

2 is a block diagram illustrating a wireless charging system according to another embodiment.

3 is a diagram for describing a detection signal transmission procedure in a wireless charging system according to an embodiment.

4 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.

5 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC (Qi) standard.

6 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.

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

FIG. 8 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 7.

9 is a diagram for describing a coil of a coil device, according to an exemplary embodiment.

10 is a cross-sectional view for describing a cross section of the coil of FIG. 9.

11 is an exploded perspective view for explaining a coil device in which the coil of FIG. 9 is disposed.

12 is a diagram for describing a coil of a coil device according to another embodiment.

FIG. 13 is a cross-sectional view for describing a cross section of the coil of FIG. 12.

14 is an exploded perspective view illustrating a coil of a coil device according to still another embodiment.

FIG. 15 is a plan view illustrating the coil of FIG. 14.

FIG. 16 is a cross-sectional view illustrating a cross section of the coil of FIG. 15.

17 is a cross-sectional view illustrating a coil of a coil device according to still another embodiment.

FIG. 18 is a diagram illustrating three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils, according to an exemplary embodiment.

FIG. 19 is a diagram for describing a wireless power transmitter including a plurality of coils and a single drive circuit, according to an exemplary embodiment.

20 is a diagram for describing a plurality of switches connecting one of a plurality of transmission coils to a drive circuit according to an exemplary 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 (before) or after (behind) "include both in which the two components are in direct contact with each other or one or more other components are formed disposed between the 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 apparatus for transmitting wireless power on the wireless power charging system is a wireless power transmitter, wireless power transmitter, wireless power transmitter, wireless power transmitter, transmitter, transmitter, transmitter, transmitting side for convenience of description. A wireless power transmitter, a wireless power transmitter, and a wireless charging device will be used in combination. In addition, as a representation of a device for receiving the wireless power from the wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Terminals and the like may be used interchangeably.

Wireless charging apparatus according to the embodiment may be configured in the form of a pad, a cradle, an access point (AP), a small base station, a stand, a ceiling buried, a wall, etc., one transmitter receives a plurality of wireless power It may also transmit power to the device.

For example, the wireless power transmitter may not only be used on a desk or a table, but also may be developed and applied to 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 simply 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 a toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, and the like, but is not limited to this. 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. Here, the wireless power transmission method may include at least one of the electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method. In particular, the wireless power receiving means supporting the electromagnetic induction method may include electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and Air Fuel Alliance (formerly PMA, Power Matters Alliance). Can be. In addition, the wireless power receiving means supporting the electromagnetic resonance method may include a wireless charging technology of the resonance method defined in the Air Fuel Alliance (formerly A4WP, Alliance for Wireless Power) standard mechanism of the wireless charging technology standard mechanism.

In general, the wireless power transmitter and the wireless power receiver constituting the wireless power system may exchange control signals or information through in-band communication or Bluetooth low energy (BLE) 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.

Referring to FIG. 1, a wireless charging system includes a wireless power transmitter 10 that largely transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 30 that receives the received power. Can be configured.

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

For example, the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transmitting and receiving end will be more clear 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 are not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may provide one-way communication or half-duplex communication.

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

In the half-duplex communication method, bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.

The wireless power receiver 20 according to an embodiment 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 illustrating a wireless charging system according to another embodiment.

For example, as illustrated by reference numeral 200a, the wireless power receiver 20 may be configured with a plurality of wireless power receivers, and a plurality of wireless power receivers are connected to one wireless power transmitter 10 so that the wireless Charging may also be performed. In this case, the wireless power transmitter 10 may distribute and transmit power to the plurality of wireless power receivers in a time division manner, but is not limited thereto. As another example, the wireless power transmitter 10 may be configured for each wireless power receiver. By using different allocated frequency bands, power may be distributed and transmitted to a plurality of wireless power receivers.

In this case, the number of wireless power receivers that can be connected to one wireless power transmitter is adapted based on at least one of required power for each wireless power receiver, battery charge state, power consumption of the electronic device, and available power of the wireless power transmitter. Can be determined as

As another example, as illustrated in FIG. 200B, the wireless power transmitter 10 may include a plurality of wireless power transmitters. In this case, the wireless power receiver 20 may be connected to a plurality of wireless power transmitters at the same time, and may simultaneously receive power from the connected wireless power transmitters and perform charging. In this case, the number of wireless power transmitters connected to the wireless power receiver 20 is adaptively based on the required power of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, the available power of the wireless power transmitter, and the like. Can be determined.

3 is a diagram for describing a detection signal transmission procedure in a wireless charging system according to an embodiment.

For example, the wireless power transmitter may be equipped with three transmitting coils 111, 112, and 113. Each transmission coil may overlap some other area with another transmission coil, and the wireless power transmitter may detect a predetermined detection signal 117, 127 for detecting the presence of the wireless power receiver through each transmission coil, for example, Digital ping signals are sent sequentially in a predefined order.

As shown in FIG. 3, the wireless power transmitter sequentially transmits the detection signal 117 through the primary detection signal transmission procedure illustrated in FIG. 110, and receives a signal strength indicator from the wireless power receiver 115. The strength indicator 116 (or signal strength packet) may identify the received transmission coils 111, 112. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in FIG. 120, and transmits power among the transmission coils 111 and 112 where the signal strength indicator 126 is received. The efficiency (or charging efficiency)-that is, the alignment between the transmitting coil and the receiving coil-can identify a good transmitting coil and control that power can be sent through the identified transmitting coil-i.e. wireless charging is made. .

As shown in FIG. 3, the reason why the wireless power transmitter performs two sensing signal transmission procedures is to more accurately identify which transmitting coil is well aligned with the receiving coil of the wireless power receiver.

If the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112, as shown in the reference numerals 110 and 120 of FIG. 3, the wireless power transmitter. Based on the signal strength indicator 126 received at each of the first transmitting coil 111 and the second transmitting coil 112 selects the best-aligned transmitting coil and performs wireless charging using the selected transmitting coil. .

4 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.

Referring to FIG. 4, power transmission from a transmitter to a receiver according to the WPC standard is largely selected from a selection phase 410, a ping phase 420, an identification and configuration phase 430, It may be divided into a power transfer phase 440.

The selection step 410 may be a step of transitioning when a specific error or a specific event is detected while starting or maintaining the power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the selection step 410, the transmitter may monitor whether an object exists on the interface surface. If the transmitter detects that an object is placed on the interface surface, it may transition to the ping step 420 (S401). In the selection step 410, the transmitter transmits a very short pulse of an analog ping signal, and may detect whether an object exists in an active area of the interface surface based on a change in current of a transmitting coil.

In ping step 420, when an object is detected, the transmitter activates the receiver and sends a digital ping to identify whether the receiver is a receiver that is compliant with the WPC standard. If the transmitter does not receive a response signal (for example, a signal strength indicator) from the receiver in response to the digital ping in step 420, it may transition back to the selection step 410 (S402). In addition, in the ping step 420, when the transmitter receives a signal indicating that power transmission is completed, that is, a charging completion signal, from the receiver, the transmitter may transition to the selection step 410 (S403).

When the ping step 420 is completed, the transmitter may transition to the identification and configuration step 430 for collecting receiver identification and receiver configuration and status information (S404).

In the identification and configuration step 430, the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, a packet transmission error, or a power transmission contract. If this is not set (no power transfer contract) it may transition to the selection step (410) (S405).

When identification and configuration of the receiver is completed, the transmitter may transition to a power transmission step 440 for transmitting wireless power (S406).

In the power transfer step 440, the transmitter receives an unexpected packet, the desired packet has not been received for a predefined time, or a violation of a preset power transfer contract occurs. transfer contract violation), if the filling is completed, the transition to the selection step (410) (S407).

In addition, in the power transmission step 440, if it is necessary to reconfigure the power transmission contract in accordance with the change in the transmitter state, the transmitter may transition to the identification and configuration step 430 (S408).

The power transmission contract may be set based on state and characteristic information of the transmitter and the receiver. For example, the transmitter state information may include information about the maximum amount of power that can be transmitted, information about the maximum number of receivers that can be accommodated, and the receiver state information may include information about required power.

5 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC (Qi) standard.

Referring to FIG. 5, power transmission from a transmitter to a receiver according to the WPC (Qi) standard is largely selected as a selection phase 510, a ping phase 520, an identification and configuration phase, and so on. 530, a negotiation phase 540, a calibration phase 550, a power transfer phase 560, and a renegotiation phase 570.

The selection step 510 may be a transition step, for example, S502, S504, S507, S510, and S512 when a specific error or a specific event is detected while starting or maintaining power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the selection step 510, the transmitter may monitor whether an object exists on the interface surface. If the transmitter detects that an object is placed on the interface surface, the transmitter may transition to the ping step 520 (S501). In the selection step 510, the transmitter transmits a very short pulse of an analog ping signal and an object in the active area of the interface surface based on the current change of the transmitting coil or the primary coil. Can detect the presence of

In ping step 520, when an object is detected, the transmitter activates the receiver and sends a digital ping to identify whether the receiver is a receiver that is compliant with the WPC standard. If the transmitter does not receive a response signal (eg, a signal strength packet) for the digital ping from the receiver in the ping step 520, it may transition back to the selection step 510 (S502). In addition, in the ping step 520, when the transmitter receives a signal indicating that power transmission is completed, that is, a charging completion packet, it may transition to the selection step 510 (S502).

When the ping step 520 is completed, the transmitter may transition to the identification and configuration step 530 for identifying the receiver and collecting receiver configuration and status information (S503).

In the identification and configuration step 530, the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, a packet transmission error, or a power transmission contract. If this is not set (no power transfer contract) it may transition to the selection step (510) (S504).

The transmitter may determine whether entry into the negotiation step 540 is necessary based on a negotiation field value of the configuration packet received in the identification and configuration step 530.

As a result of the check, if negotiation is necessary, the transmitter may enter a negotiation step 540 to perform a predetermined FOD detection procedure and make a power transmission contract (S505).

On the other hand, if it is determined that negotiation is not necessary, the transmitter may immediately enter the power transmission step 560 (S506).

In negotiation step 540, the wireless power transmitter and the wireless power receiver may make a power transmission contract. The power transmission contract may be set based on state and characteristic information of the transmitter and the receiver. For example, the transmitter state information may include information about the maximum amount of power that can be transmitted, information about the maximum number of receivers that can be accommodated, and the receiver state information may include information about required power.

In addition, the power transfer agreement may include guaranteed power. The guaranteed power of the power transmission contract may be a power intensity value determined by the wireless power transmitter and the wireless power receiver to transmit during wireless charging in the power transmission phase. The guaranteed power of the power transfer agreement may have a default value. In addition, the guaranteed power of the power transmission contract can be determined based on the guaranteed power of the wireless power transmitter and the required power of the wireless power receiver. A detailed description of determining the guaranteed power of a power transmission contract will be given later. Note that there is a difference between the guaranteed power of the power transmission contract and the guaranteed power of the wireless power transmitter. That is, the guaranteed power of the power transmission contract may be a power intensity value transmitted in the power transmission step, and the guaranteed power of the wireless power transmitter may be a power intensity value that the wireless power transmitter can transmit. The guaranteed power of the wireless power transmitter may be information recorded in the power transmitter capability packet, which will be described later.

In addition, in the negotiation step 540, the transmitter may receive a Foreign Object Detection (FOD) status packet including a reference quality factor value. In this case, the transmitter may determine a threshold for FO detection based on the reference quality factor value.

The transmitter may detect whether the FO exists in the charging region by using the determined threshold for FO detection and the currently measured quality factor value, and control power transmission according to the FO detection result. For example, when the FO is detected, power transmission may be stopped, but is not limited thereto.

If the FO is detected, the transmitter may return to the selection step 510 (S507). On the other hand, when the FO is not detected, the transmitter may enter the power transmission step 560 through the correction step 550 (S508) (S509). In detail, when the FO is not detected, the transmitter determines the strength of the power received at the receiving end in the correction step 550, and determines the power loss at the receiving end and the transmitting end to determine the strength of the power transmitted by the transmitting end. It can be measured. That is, the transmitter may predict the power loss based on the difference between the transmit power of the transmitter and the receive power of the receiver in the correction step 550. The transmitter according to an embodiment may correct the threshold for FOD detection by reflecting the predicted power loss.

In power transmission step 540, the transmitter receives an unexpected packet, an outgoing desired packet for a predefined time, or a violation of a predetermined power transmission contract occurs. transfer contract violation), if the filling is complete, the transition to the selection step (510) (S510).

In addition, in the power transmission step 540, if it is necessary to reconfigure the power transmission contract according to the change in the transmitter state, the transmitter may transition to the renegotiation step 570 (S511).

In the renegotiation step 570, if the renegotiation such as a power transmission contract is normally completed, the transmitter may return to the power transmission step 560 (S513). Further, in the renegotiation step 570, the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, or a violation of a preset power transmission contract occurs ( power transfer contract violation), if the charging is completed, the transition to the selection step (510) (S512).

6 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.

Referring to FIG. 6, power transmission from a transmitter to a receiver according to the PMA standard is divided into a standby phase (Standby Phase, 610), a digital ping phase (620), an identification phase (630), and a power transmission. It may be divided into a power transfer phase 640 and an end of charge phase 650.

The waiting step 610 may be a step of transitioning when a specific error or a specific event is detected while performing a receiver identification procedure for power transmission or maintaining power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the waiting step 610, the transmitter may monitor whether an object exists on the charging surface. If the transmitter detects that an object is placed on the charging surface or the RXID retry is in progress, the transmitter may transition to the digital ping step 620 (S601). Here, RXID is a unique identifier assigned to a PMA compatible receiver. In the standby stage 610, the transmitter transmits a very short pulse of analog ping, and an object is placed on the active surface of the interface surface-for example, the charging bed-based on the current change of the transmitting coil. You can detect if it exists.

The transmitter transitioned to the digital ping step 620 sends a digital ping signal to identify whether the detected object is a PMA compatible receiver. When sufficient power is supplied to the receiver by the digital ping signal transmitted by the transmitter, the receiver may modulate the received digital ping signal according to the PMA communication protocol to transmit a predetermined response signal to the transmitter. Here, the response signal may include a signal strength indicator indicating the strength of the power received by the receiver. If the valid ping signal is received in the digital ping step 620, the transmitter may transition to the identification step 630 (S602).

If, at the digital ping step 620, no response signal is received or is determined to be not a PMA compatible receiver-i.e., Foreign Object Detection (FOD)-then the transmitter can transition to the standby step 610. (S603). For example, the Foreign Object (FO) may be a metallic object including coins, keys, and the like.

In the identification step 630, the transmitter may transition to the waiting step 610 if the receiver identification procedure fails or the receiver identification procedure needs to be performed again and if the receiver identification procedure has not been completed for a predefined time ( S604).

If the transmitter succeeds in identifying the receiver, the transmitter transitions from the identification step 630 to the power transmission step 640 to start charging (S605).

In power transmission step 640, the transmitter goes to standby step 610 if the desired signal is not received within a predetermined time (Time Out), or if the FO is detected or the voltage of the transmitting coil exceeds a predefined threshold. It may transition (S606).

In addition, in the power transmission step 640, when the temperature sensed by the temperature sensor provided therein exceeds a predetermined reference value, the transmitter may transition to the charging completion step 650 (S607).

In the charging completion step 650, when it is confirmed that the receiver is removed from the charging surface, the transmitter may transition to the standby state 610 (S609).

In addition, the transmitter may transition from the charging completion step 650 to the digital ping step 620 when the measured temperature after a predetermined time has elapsed below the reference value in the over temperature state (S610).

In the digital pinging step 620 or the power transmission step 640, when the End Of Charge (EOC) request is received from the receiver, the transmitter may transition to the charging completion step 650 (S608 and S611).

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

Referring to FIG. 7, the wireless power transmitter 700 may largely include a power converter 710, a power transmitter 720, a communicator 730, a controller 740, and a sensor 750. . It should be noted that the configuration of the wireless power transmitter 700 is not necessarily an essential configuration and may include more or fewer components.

As shown in FIG. 7, when power is supplied from the power supply unit 760, the power converter 710 may perform a function of converting the power into power of a predetermined intensity.

To this end, the power converter 710 may include a DC / DC converter 711 and an amplifier 712.

The DC / DC converter 711 may perform a function of converting DC power supplied from the power supply unit 760 into DC power of a specific intensity according to a control signal of the controller 740.

In this case, the sensing unit 750 may measure the voltage / current of the DC-converted power and provide the same to the control unit 740. In addition, the sensing unit 750 may measure the internal temperature of the wireless power transmitter 700 to determine whether overheating occurs, and provide the measurement result to the controller 740. For example, the controller 740 may adaptively block power supply from the power supply unit 750 or block power supply to the amplifier 712 based on the voltage / current value measured by the sensing unit 750. Can be. To this end, one side of the power converter 710 may be further provided with a predetermined power cut-off circuit for cutting off the power supplied from the power supply unit 750, or to cut off the power supplied to the amplifier 712.

The amplifier 712 may adjust the intensity of the DC / DC converted power according to the control signal of the controller 740. For example, the controller 740 may receive power reception state information and / or power control signal of the wireless power receiver through the communication unit 730, and may be based on the received power reception state information or (and) power control signal. Thus, the amplification factor of the amplifier 712 can be dynamically adjusted. For example, the power reception state information may include, but is not limited to, strength information of the rectifier output voltage and strength information of a current applied to the receiving 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 720 may include a multiplexer 721 (or multiplexer) and a transmission coil 722. In addition, the power transmitter 720 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 712 received through the multiplexer 721 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 721 to generate AC power. However, this is only one embodiment, and the other example is before the amplifier 712. Note that it may be mixed in stages or later.

Frequency of AC power delivered to each transmission coil according to one embodiment may be different from each other, and another embodiment each using a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each transmission coil It is also possible to set different resonant frequencies for each transmission coil.

However, when the resonant frequencies generated in each of the plurality of transmission coils are different, a separate frequency controller for controlling the same may be required, thereby increasing the size of the wireless power transmitter. Thus, in one embodiment, the wireless power transmitter may include the plurality of transmission coils. 25 to 27 illustrate a case in which power is transmitted using the same resonant frequency, even if including.

As shown in FIG. 7, the power transmitter 720 includes a multiplexer 721 and a plurality of transmit coils 722-that is, a first to control the output power of the amplifier 712 to be transmitted to the transmit coil. To n-th transmission coils.

When a plurality of wireless power receivers are connected, the controller 740 according to an embodiment may transmit power through time division multiplexing for each transmission coil. For example, in the wireless power transmitter 700, three wireless power receivers, i.e., the first to third wireless power receivers, are each identified through three different transmitting coils, i.e., the first to third transmitting coils. The controller 740 may control the multiplexer 721 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 the time slot allocated to each transmitting coil, but this is only one embodiment. By controlling the amplification factor of the amplifier 712 of the wireless power receiver may control the transmission power.

The controller 740 may control the multiplexer 721 to sequentially transmit the sensing signals through the first to nth transmitting coils 722 during the first sensing signal transmitting procedure. In this case, the controller 740 may identify a time point at which the detection signal is transmitted using the timer 755. When the detection signal transmission time arrives, the control unit 740 controls the multiplexer 721 to detect the detection signal through the corresponding transmission coil. Can be controlled to be sent. For example, the timer 750 may transmit a specific event signal to the controller 740 at predetermined intervals during the ping transmission step. When the corresponding event signal is detected, the controller 740 controls the multiplexer 721 to transmit the specific event signal. The digital ping can be sent through the coil.

In addition, the control unit 740 may determine a predetermined transmission coil identifier and a corresponding transmission coil for identifying which transmission coil has received a signal strength indicator from the demodulator 732 during the first detection signal transmission procedure. Signal strength indicator received through the can be received. Subsequently, in the second detection signal transmission procedure, the control unit 740 controls the multiplexer 721 to transmit the detection signal only through the transmission coil (s) in which the signal strength indicator was received during the first detection signal transmission procedure. You may. As another example, the control unit 740 transmits the second sensed signal to the transmitting coil in which the signal strength indicator having the largest value is received when there are a plurality of transmit coils in which the signal strength indicator is received during the first sensed signal transmitting procedure. In the procedure, the detection signal may be determined as the transmission coil to be transmitted first, and the multiplexer 721 may be controlled according to the determination result.

The modulator 731 may modulate and transmit the control signal generated by the controller 740 to the multiplexer 721. 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 transmitting coil is detected, the demodulator 732 may demodulate the detected signal and transmit the demodulated signal to the controller 740. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for controlling power 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 732 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 740 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

For example, the wireless power transmitter 700 may obtain the 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 700 may transmit wireless power using the transmission coil 722 and may exchange various information with the wireless power receiver through the transmission coil 722. As another example, the wireless power transmitter 700 further includes a separate coil corresponding to each of the transmission coils 722 (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 the description of FIG. 7, the wireless power transmitter 700 and the wireless power receiver perform in-band communication by way of example. However, this is only one embodiment, and is a frequency band used for wireless power signal transmission. Short-range bidirectional communication may be performed through a frequency band different from that of FIG. For example, the short-range bidirectional communication may be any one of low power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

In particular, the transmitting coil 722 may be a coil produced by the coil and the manufacturing method of the coil of FIGS. 9 to 24 to be described later.

FIG. 8 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 7.

Referring to FIG. 8, the wireless power receiver 800 includes a receiving coil 810, a rectifier 820, a DC / DC converter 830, a load 840, a sensing unit 850, and a communication unit ( 860, the main control unit 870 may be configured. Here, the communication unit 860 may include at least one of a demodulator 861 and a modulator 862.

Although the wireless power receiver 800 illustrated in the example of FIG. 8 is illustrated as being capable of exchanging information with the wireless power transmitter through in-band communication, this is only one embodiment, and in another embodiment. The communication unit 860 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 810 may be transferred to the rectifier 820. The rectifier 820 may convert AC power into DC power and transmit the DC power to the DC / DC converter 830. The DC / DC converter 830 may convert the strength of the rectifier output DC power into a specific strength required by the load 840 and then transfer the power to the load 840. In addition, the receiving coil 810 may include a plurality of receiving coils (not shown), that is, the first to nth receiving coils. Frequency of AC power delivered to each receiving coil (not shown) according to one embodiment may be different from each other, another embodiment is a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each receiving coil It is also possible to set a different resonant frequency for each receiving coil by using a.

In particular, the receiving coil 810 may be a coil produced by the coil and the coil manufacturing method of FIGS. 9 to 24 to be described later.

The sensing unit 850 may measure the intensity of the rectifier 820 output DC power and provide the same to the main controller 870. In addition, the sensing unit 850 may measure the strength of the current applied to the receiving coil 810 according to the wireless power reception, and may transmit the measurement result to the main control unit 870. In addition, the sensing unit 850 may measure the internal temperature of the wireless power receiver 800 and provide the measured temperature value to the main controller 870.

As an example, the main controller 870 may determine whether the overvoltage is generated by comparing the measured intensity of the rectifier output DC power with a predetermined reference value. As a result of the determination, when the overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 862. Here, the signal modulated by the modulator 862 may be transmitted to the wireless power transmitter through the receiving coil 810 or a separate coil (not shown). In addition, the main controller 870 may determine that the detection signal is received when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value. When the detection signal is received, a signal strength indicator corresponding to the detection signal may be modulated by the modulator 862. Can be transmitted to the wireless power transmitter. As another example, the demodulator 861 demodulates an AC power signal between the receiving coil 810 and the rectifier 820 or an output DC power signal of the rectifier 820 to identify whether a detection signal is received, and then identifies an identification result. It may be provided to the unit 870. In this case, the main controller 870 may control a signal strength indicator corresponding to the sensed signal to be transmitted through the modulator 862.

<Day Example  According to coil device>

9 is a diagram illustrating a coil of a coil device according to an embodiment, and FIG. 10 is a cross-sectional view illustrating a cross section of the coil of FIG. 9.

The coil device may be at least one of a transmitting coil of a wireless power transmitter or a receiving coil of a wireless power receiver. In addition, the present invention is not limited to the wireless power transmission device, but may be applied to a device using a coil for wirelessly transferring induced electromotive force.

9 is a plan view of a coil included in a coil apparatus according to an exemplary embodiment.

Referring to FIG. 9, a coil device according to an embodiment may include a coil disposed in a plurality of layers.

More specifically, the coil may include a first coil 910 disposed in the first layer and a second coil 920 disposed in the second layer. In addition, although the first coil 910 and the second coil 920 are referred to differently according to the disposed positions, the first coil 910 and the second coil 920 are formed of one coil line or one coil pattern. It may be a coil of. In addition, the coil may include a first adhesive layer 930 disposed between the first coil 910 and the second coil 920. The first layer may refer to the bottom of the first adhesive layer 930, and the second layer may refer to the top of the first adhesive layer 930.

The first adhesive layer 930 may be an adhesive or an adhesive member. In addition, the first adhesive layer 930 may be flexible or rigid when it is an adhesive member. The first adhesive layer 930 may maintain the coil shape by fixing the structures of the coils formed in the coil line or the coil pattern, that is, the first coil 910 and the second coil 920. In addition, the first adhesive layer 930 may radiate heat generated from the coils that are in contact, that is, the first coil 910 and the second coil 920. In addition, the first adhesive layer 930 may include a coil hole 931 so that the first coil 910 and the second coil 920 may be connected to each other.

In addition, the coil may include a first extension line 911 or a second extension line 921 to receive an AC signal or to provide an AC signal. In addition, the first extension line 911 may be electrically connected to a first pad (not shown) through which an AC signal is input / output. The second extension line 921 may be electrically connected to a second pad (not shown) through which an AC signal is input / output. In addition, the first extension line 911 may extend from the first pad and be connected to the first coil 910. The second extension line 921 may extend from the second pad to be connected to the second coil 920. Thus, the coil according to the embodiment may be arranged in one area of the input and output pads can be simplified in structure.

In addition, the coil may be disposed at least once in a spiral shape, a circular shape, an elliptic shape, a racetrack shape, a square shape, a triangular shape, a square circular shape, or the like. For example, as illustrated in FIG. 9, the first coil 910 and the second coil 920 may have a rectangular circular shape. In addition, the first coil 910 and the second coil 920 may be disposed in the same shape with each other. The present invention is not limited thereto, and the first coil and the second coil may be disposed in different shapes. As another example, the first coil may have a rectangular circular shape, and the second coil may have a circular shape.

In more detail, the structure of the coil extends from the first extension line 911 so that the first adhesive layer starts from the bottom of the first adhesive layer 930, that is, from the outer region of the first adhesive layer 930, starting from the first layer. The first coil 910 is disposed to be turned a plurality of times in the direction of the inner region of the 930, and the first coil 910 extends to penetrate the coil hole 931 and the upper end of the first adhesive layer 930, that is, the first coil 910. Starting again from the second layer, the second coil 920 is disposed by turning a plurality of times in the inner region toward the outer region of the first adhesive layer 930, and the second coil 920 extends back to the second extension line 921. Can be. In particular, the first coil 910 and the second coil 920 may be arranged such that the coil lines or coil patterns cross each other and do not overlap each other. Detailed description thereof will be described later. It may be referred to as a first coil 910 and a second coil 920 around the coil hole 931. Since the first coil 910 is positioned below the first adhesive layer 930 and the second coil 920 is positioned above the first adhesive layer 930 near the coil hole 931, a step may be formed. For example, as shown in FIG. 9, the first coil 910 is turned twice in the first layer and the second coil 920 is turned three times in the second layer. That is, the first coil 910 is disposed less turns than the second coil 920. The present invention is not limited thereto, and the first coil may be arranged to have a larger number of turns than the second coil. In addition, the number of turns of the first coil and the second coil may be the same.

In addition, in one embodiment, the coil is disposed in two layers in the form of the first coil 910 and the second coil 920, but is not limited thereto. The first coil to the nth coil may be separated from each other by n layers. Can be arranged (n is an integer of 2 or more).

FIG. 10 is a cross-sectional view illustrating a cross section of I to I ′ of the coil of FIG. 9.

The coil may be disposed to cross the first coil 910 and the second coil 920 when viewed from the top surface. More specifically, the coil may be disposed to cross the coil line or coil pattern of the first coil 910 and the coil line or coil pattern of the second coil 920 in different layers. For example, as illustrated in FIG. 10, the first coil 910 may be a coil wire or a coil pattern disposed at the outermost part of the first layer, and may be formed inside the first-first coil wire 910a and the first-first coil wire 910a. The second coil wire 910b may be disposed to be adjacent to each other. In addition, the second coil 920 is formed of a coil wire disposed at the outermost portion of the second layer or a second coil coil 920a and a coil pattern 920a which are adjacent to the inner side of the second coil coil 920a. It may include a 2-2 coil wire 920b and a 2-3 coil wire 920c disposed at the innermost corner. In the coil, the second-first coil wire 920a and the second-second coil wire 920b are disposed to be spaced apart from each other, and the first-first coil wire 910a is disposed in the second layer. The coil wire 920a and the second-2 coil wire 920b may be disposed. In addition, the coil is disposed so that the second-2 coil wires 920b and the 2-3 coil wires 920c are spaced apart from each other on the second layer, and the second coil wires 910b are disposed on the second layer. It may be disposed between the two coil wires 920b and the 2-3 coil wires 920c.

Coils of the coil device according to an embodiment may be arranged to cross the first coil 910 and the second coil 920 so as not to overlap or overlap. More specifically, the line width a of the coil line or the coil pattern of the first coil 910 or the second coil 920 may be a predetermined length. In addition, the 2-1 coil line 920a and the 2-2 coil line 920b may be spaced apart from each other by a first separation distance b1. The line width a of the first-first coil line 910a may be smaller than the first separation distance b1. In addition, the first-first coil wire 910a may be spaced apart from the second-first coil wire 920a by a second separation distance b2. In addition, the first-first coil wire 910a may be spaced apart from the second-second coil wire 920b by a third separation distance b2 '. Similarly, the 1-2 coil wire 910b is disposed between the 2-2 coil wire 920b and the 2-3 coil wire 920c, and the 2-2 coil wire 920b and the second coil wire 910b are disposed. The coil may be spaced apart from the coil wire 920c.

Therefore, the coil according to the exemplary embodiment may efficiently dissipate heat generated from the coil since the coil lines or the coil patterns are spaced apart from each other. In addition, since the coil according to an embodiment is arranged in a single coil wire or coil pattern in different layers, the heat radiation efficiency can be increased since the area where the heat generated from the coil can be radiated increases.

In addition, the coil may have an outer length D1 of the second coil 920 greater than an outer length E1 of the first coil 910. The present invention is not limited thereto, and both configurations can be arranged by making the outer length of the second coil smaller than the outer length of the first coil.

In addition, the coil according to an embodiment may increase the wireless power transmission efficiency because the length (C1) of the outer side to the inner side is smaller than the length of the inner side of the conventional coil. More specifically, it is assumed that the region from the outer end of the coil to the other end of the coil is a charging region, and the region from the outer side to the inner side of the coil that provides the wireless charging signal at the maximum intensity is the concentrated charging region. In this case, if the number of windings or inductance of the coil according to the embodiment and the conventional coil are the same, both the coil and the conventional coil according to the embodiment may have the same charging region as D1, but the coil according to the embodiment The concentrated charging region C1 may be smaller than the concentrated charging region of the conventional coil. As the concentrated charging region is smaller, the energy of the wireless charging signal provided by the concentrated charging region may increase. Accordingly, in the coil according to the embodiment, when the charging device is located in the charging region, the transmission efficiency of the wireless charging signal is increased compared to the conventional coil.

11 is an exploded perspective view for explaining a coil device in which the coil of FIG. 9 is disposed.

Referring to FIG. 11, the coil device of FIG. 9 may include a substrate 960. The substrate 960 may be a flexible substrate or a rigid substrate.

In addition, the coil device may include a shield 950. The shield 950 may be disposed on an upper surface of the substrate 960. The shielding material 950 may guide the wireless power generated from the coils 910 and 920 disposed thereon in the charging direction. In addition, the shield 950 may protect various circuits disposed below from the electromagnetic field.

In addition, the coil device may fix the coil, that is, the first coil 910 and the second coil 920, to the shielding material 950 by the second adhesive layer 940. The second adhesive layer 940 may be an adhesive or an adhesive member. In addition, in the case of the adhesive member, the second adhesive layer 940 may be flexible or rigid. In addition, the coil apparatus may include a coil disposed in a plurality of layers of FIG. 9. That is, the coil may include a first coil 910 extending from the first extension line 911, a first adhesive layer 930 on which the coil hole 931 is disposed, and a second coil 920 extending from the second extension line 921. It may include. In addition, the first coil 910 and the second coil 920 may be formed with a stepped portion 912 around the coil hole 931. That is, the stepped part 912 may be formed by the first adhesive layer 930 while extending from the first coil 910 to the second coil 920. 9 illustrates the first coil 910, the stepped part 921, and the second coil 920 separated for convenience of description, but as described in FIG. 9, the first coil 910 and the stepped part 921 are illustrated. All of the second coils 920 may be connected to one coil line or a coil pattern.

Therefore, an embodiment can provide a coil device having excellent heat dissipation efficiency. In addition, an embodiment may provide a coil device having excellent wireless power transmission efficiency. In addition, one embodiment may provide a coil device having a simple structure.

<Other Example  According to coil device>

FIG. 12 is a diagram illustrating a coil of a coil device according to another embodiment, and FIG. 13 is a cross-sectional view illustrating a cross section of the coil of FIG. 12.

The coil device according to another embodiment may be at least one of a transmitting coil of the wireless power transmitter or a receiving coil of the wireless power receiver. In addition, the present invention is not limited to the wireless power transmission device, but may be applied to a device using a coil for wirelessly transferring induced electromotive force.

In addition, the coil of the coil device according to another embodiment may have a difference in the arrangement relationship between the first coil and the second coil as compared to the coil of the coil device according to the embodiment of FIG. 9. Hereinafter, description of the coil device according to another embodiment will be mainly focused on the difference.

12 is a plan view of a coil included in a coil device according to another exemplary embodiment.

Referring to FIG. 12, a coil device according to another embodiment may include a coil. The coil may include a first adhesive layer 1030, a first coil 1010 disposed on a first layer that is a lower end of the first adhesive layer 1030, and a second coil disposed on a second layer that is an upper end of the first adhesive layer 1030 ( 1020). Although the first coil 1010 and the second coil 1020 are referred to differently according to the disposed positions, the first coil 1010 and the second coil 1020 are one coil formed of one coil line or one coil pattern. Can be. In addition, the first adhesive layer 1030 may include a coil hole 1031 so that the first coil 1010 and the second coil 1020 may be connected. In addition, the coil may include a first extension line 1011 extending from the first coil 1010 or a second extension line 1021 extending from the second coil 1020 to receive or provide an AC signal. have.

In more detail, the structure of the coil extends from the first extension line 1011 so that the first adhesive layer starts from the lower end of the first adhesive layer 1030, that is, the first layer, starting from the outer region of the first adhesive layer 1030. The first coil 1010 is disposed a plurality of times in the direction of the inner region of the 1030, the first coil 1010 extends to penetrate the coil hole 1031, and the upper end of the first adhesive layer 1030, that is, the first coil 1010 is disposed. Starting again from the second layer, the second coil 1020 is disposed by turning a plurality of times in the inner region toward the outer region of the first adhesive layer 1030, and the second coil 1020 extends back to the second extension line 1021. Can be. In particular, the first coil 1010 and the second coil 1020 may be disposed so that coil lines or coil patterns cross each other and partially overlap each other. Detailed description thereof will be described later. In addition, the first coil 1010 and the second coil 1020 may be referred to as a boundary of the coil hole 1031. In the vicinity of the coil hole 1031, since the first coil 1010 is positioned at the bottom of the first adhesive layer 1030 and the second coil 1020 is positioned at the top of the second adhesive layer 1030, a step may be formed. For example, as shown in FIG. 12, the first coil 1010 turns twice in the first layer and the second coil 1020 turns three times in the second layer. That is, the first coil 910 is disposed less turns than the second coil 920. The present invention is not limited thereto, and the first coil may be arranged to have a larger number of turns than the second coil. In addition, the number of turns of the first coil and the second coil may be the same.

In another embodiment, the coil is disposed in two layers in the form of the first coil 1010 and the second coil 1020, but the present invention is not limited thereto. Can be arranged (n is an integer of 2 or more).

FIG. 13 is a cross-sectional view illustrating a cross section taken along II to II ′ of the coil of FIG. 12.

Referring to FIG. 13, when the coil is viewed from an upper surface, the first coil 1010 and the second coil 1020 may cross each other. More specifically, the coil may be disposed to cross the coil line or coil pattern of the first coil 1010 and the coil line or coil pattern of the second coil 1020 in different layers. For example, as illustrated in FIG. 13, the first coil 1010 may be a coil wire or a coil pattern disposed at the outermost side of the first layer, and may be inside the first-first coil wire 1010a and the first-first coil wire 1010a. The second coil wire 1010b may be disposed to be adjacent to each other. In addition, the second coil 1020 may be disposed adjacent to the inside of the 2-1 coil wire 1020a and the 2-1 coil wire 1020a, which are coil lines or coil patterns disposed at the outermost portion of the second layer. It may include a 2-2 coil wire 1020b and a 2-3 coil wire 1020c disposed at the innermost corner. In the coil, the 2-1 coil wire 1020a and the 2-2 coil wire 1020b are disposed to be spaced apart from each other, and the 1-1 coil wire 1010a is arranged in the first layer. It may be disposed between the coil wire 1020a and the second-2 coil wire 1020b. In addition, in the coil, the second coil coil 1020b and the second coil coil 1020c are disposed to be spaced apart from each other, and the first coil coil 1010b is disposed in the first layer. 2 may be disposed between the coil wire 1020b and the 2-3 coil wire 1020c.

Coils of the coil device according to another embodiment may be arranged to cross the first coil 1010 and the second coil 1020 so as to overlap or overlap. More specifically, the line width a of the coil line or the coil pattern of the first coil 1010 or the second coil 1020 may be a predetermined length. In addition, the 2-1 coil wire 1020a and the 2-2 coil wire 1020b may be spaced apart from each other by a first separation distance b3. The first separation distance b3 may be smaller than the line width a of the coil line or the coil pattern. For example, when viewed from above, the first-first coil line 1010a may be disposed to overlap or overlap the second-first coil line 1020a and the second-second coil line 1020b.

Therefore, the coil according to another embodiment may efficiently discharge heat generated from the coil because the coil wires or the coil patterns are spaced apart from each other. In addition, since the coil according to another embodiment has one coil line or a coil pattern arranged in different layers, an area in which heat generated from the coil may be radiated may increase, and thus heat radiation efficiency may increase. In particular, the coil according to another embodiment may have a smaller heat dissipation effect than the coil according to the embodiment since the distance between the coil line or the coil pattern is smaller than the coil according to the embodiment.

In addition, the coil may have an outer length D2 of the second coil 1020 greater than an outer length E2 of the first coil 1010. The present invention is not limited thereto, and both configurations can be arranged by making the outer length of the second coil smaller than the outer length of the first coil.

In addition, the coil according to another embodiment may increase the wireless power transmission efficiency because the length (C2) of the outer side to the inner side is smaller than the length of the inner side of the conventional coil. In particular, since the concentrated charging region C2 of the coil according to another embodiment is smaller than the concentrated charging region C1 of the coil according to an embodiment, the energy level of the wireless charging signal of the coil according to another embodiment may be larger. have.

Therefore, another embodiment can provide a coil device excellent in heat dissipation efficiency. In addition, another embodiment may provide a coil device having excellent wireless power transmission efficiency. In addition, another embodiment may provide a coil device having a simple structure.

<Another Example  According to coil device>

14 is an exploded perspective view illustrating a coil of a coil device according to still another embodiment, FIG. 15 is a plan view illustrating the coil of FIG. 14, and FIG. 16 is a cross-sectional view illustrating a cross section of the coil of FIG. 15. .

The coil device according to another embodiment may be at least one of a transmitting coil of the wireless power transmission device or a receiving coil of the wireless power receiving device. In addition, the present invention is not limited to the wireless power transmission device, but may be applied to a device using a coil for wirelessly transferring induced electromotive force.

Referring to FIG. 14, the coil device may include a coil disposed in a plurality of layers. That is, the coil is located in the shielding material 2030 in which the coil hole 2031 is disposed, the first coil 2010 and the shielding material 2030 extending from the first extension line 2011 and positioned in the first layer that is the lower end of the shielding material 2030. The second coil 2020 may be disposed on the second layer, which is an upper end, and extend from the second extension line 2021. In addition, the stepped portion 2012 may be formed on the first coil 2010 and the second coil 2020 with respect to the coil hole 2031. That is, the stepped portion 2012 may be formed by the first adhesive layer 2030 while extending from the first coil 2010 to the second coil 2020. In particular, the stepped portion 2012 shown in FIG. 14 may have a longer length than the stepped portion 912 shown in FIG. 11. That is, the stepped portion 2012 according to FIG. 14 may have a length corresponding to the thickness of the shielding material 2030 disposed between the first coil 2010 and the second coil 2020. The stepped portion 2012 according to FIG. 11 may have a length corresponding to the thickness of the first adhesive layer 1030 disposed between the first coil 1010 and the second coil 1020. The shielding material 2030 of FIG. 14 may be thicker than the first adhesive layer 1030 of FIG. 11.

In addition, although FIG. 14 illustrates the first coil 2010, the stepped portion 2021, and the second coil 2020 separately for convenience of description, the first coil 2010 and the stepped portion 2021 are described below. The second coil 2020 may be connected to one coil wire or a coil pattern.

In addition, an adhesive layer (not shown) may be disposed between the first coil 2010 and the shield 2030 or between the second coil 2020 and the shield 2030. The adhesive layer (not shown) may be an adhesive or an adhesive member. In addition, the adhesive layer (not shown) may be flexible when the adhesive member, or may be rigid. The adhesive layer (not shown) may maintain the coil shape by fixing the structures of the coils formed in coil lines or coil patterns, that is, the first coil 2010 and the second coil 2020. In addition, the adhesive layer (not shown) may radiate heat generated from the coils that are in contact, that is, the first coil 2010 and the second coil 2020. In addition, the adhesive layer 2030 may include a second coil hole so that the first coil 2010 and the second coil 2020 may be connected to each other.

In addition, the shielding material 2030 is made of Fe, Ni, Co, Mn, Al, Zn, Cu, Ba, Ti, Sn, Sr, P, B, N, C, W, Cr, Bi, Li, Y, Cd and the like. It may include an alloy or ferrite consisting of one or a combination of two or more elements selected from the group consisting of.

In addition, the shielding material 2030 may radiate heat generated by the coils that are in contact, that is, the first coil 2010 and the second coil 2020.

In addition, the shielding material 2030 may guide the wireless power generated in the coil in the charging direction. That is, in the coil device according to another embodiment, the wireless power generated by the first coil 2010 in which the shielding material 2030 is disposed in the first layer is the first direction in the direction of the first coil 2010 in the shielding material 2030. The wireless power generated by the second coil 2020 having the shielding material 2030 disposed in the second layer may be guided in the second direction, which is the direction of the second coil 2020 from the shielding material 2030.

Therefore, the coil device according to another embodiment may have a plurality of charging directions.

In addition, the shielding material 2030 may protect various circuits disposed under the electromagnetic field.

Referring to FIG. 15, the coil may include a first extension line 2011 or a second extension line 2021 to receive an AC signal or to provide an AC signal. In addition, the first extension line 2011 may be electrically connected to a first pad (not shown) through which an AC signal is input / output. The second extension line 2021 may be electrically connected to a second pad (not shown) through which an AC signal is input / output. In addition, the first extension line 2011 may extend from the first pad and be connected to the first coil 2010. The second extension line 2021 may extend from the second pad to be connected to the second coil 2020. Accordingly, the coil according to another embodiment may arrange the pads input and output in one region, thereby simplifying the structure.

In addition, the coil may be disposed at least once in a spiral shape, a circular shape, an elliptic shape, a racetrack shape, a square shape, a triangular shape, a square circular shape, or the like. For example, as illustrated in FIG. 15, the first coil 2010 and the second coil 2020 may have a circular shape. In addition, the first coil 2010 and the second coil 2020 may be disposed in the same shape. The present invention is not limited thereto, and the first coil and the second coil may be disposed in different shapes. As another example, the first coil may have a rectangular circular shape, and the second coil may have a circular shape.

In more detail, the structure of the coil is extended from the first extension line 2011 to start at the bottom of the shield 2030, that is, the first layer, a plurality of turns from the outer region of the shield 2030 to the inner region. The first coil 2010 is disposed, and the first coil 2010 extends to penetrate the coil hole 2031 and start again at the upper end of the shielding material 2030, that is, the second layer, from the inner region to the outer region. The second coil 2020 may be disposed by turning a plurality of times, and the second coil 2020 may extend to the second extension line 2021. In addition, the first coil 2010 and the second coil 2020 may be disposed such that coil lines or coil patterns cross each other and do not overlap each other. In addition, the first coil 2010 and the second coil 2020 may be disposed such that coil lines or coil patterns cross each other and overlap each other. In addition, the first coil 2010 and the second coil 2020 may be disposed in parallel and overlap each other. For example, as shown in FIG. 15, the first coil 2010 and the second coil 2020 correspond to each other in parallel. In addition, the first coil 2010 and the second coil 2020 may be referred to as the coil hole 2031. In the vicinity of the coil hole 2031, since the first coil 2010 is positioned below the shield 2030 and the second coil 2020 is located above the shield 2030, a step may be formed. For example, as shown in FIG. 15, the first coil 2010 is turned four times in the first layer and the second coil 2020 is turned four times in the second layer. That is, the number of turns of the first coil 2010 and the second coil 2020 are equally arranged. The present invention is not limited thereto, and the first coil may be arranged with more or less turns than the second coil.

In addition, although not illustrated, the coil may not make the turn direction of the first coil 2010 and the turn direction of the second coil 2020 the same. Since the direction of the wireless power generated in the first coil and the direction of the wireless power generated in the second coil are not the same as each other, the turn direction 2010 of the first coil and the turn direction of the second coil 2020 as necessary. Can be placed differently.

In another embodiment, the coil is disposed in two layers in the form of the first coil 2010 and the second coil 2020, but the present invention is not limited thereto. It can be arranged in layers (n is an integer of 2 or more).

FIG. 16 is a cross-sectional view illustrating a cross section taken along line III to III 'of the coil of FIG. 15.

Referring to FIG. 16, when the coil is viewed from an upper surface, the first coil 2010 and the second coil 2020 may be disposed in parallel. More specifically, the coil may be parallel to the coil line or coil pattern of the first coil 2010 and the coil line or coil pattern of the second coil 2020 in different layers.

In addition, the coil may be disposed so that the coil wires or coil patterns of the first coil 2010 or the second coil 2020 are spaced apart from each other in each layer. More specifically, the line width a of the coil line or the coil pattern of the first coil 2010 or the second coil 2020 may be a predetermined length. In addition, the coil line or the coil pattern of the first coil 2010 may be spaced apart from each other by the first separation distance b4 in the first layer. In addition, coil lines or coil patterns of the second coil 2020 may be spaced apart from each other by a second separation distance b5 in the second layer. In more detail, the first separation distance b4 and the second separation distance b5 may be the same. The present invention is not limited thereto, and the first separation distance b4 and the second separation distance b5 may not be the same.

Therefore, the coil according to another embodiment may efficiently discharge heat generated from the coil because the coil wires or the coil patterns are spaced apart from each other. In addition, the coil according to another embodiment, since one coil line or coil pattern is arranged in different layers, an area in which heat generated from the coil may radiate may increase, and thus heat radiation efficiency may increase.

In addition, the outer length D3 of the second coil 2020 may have the same outer length E3 of the first coil 2010 as the coil. The outer length of the second coil and the outer length of the first coil may not be the same. In addition, the coil may have the inner length C3 at the outer side of the second coil 2020 and the inner length C4 at the outer side of the first coil 2010. The inner length at the outside of the second coil and the inner length at the outside of the first coil may not be the same.

In addition, the coil according to another embodiment may increase the wireless power transmission efficiency because the length (C3 or C4) of the inner side from the outer side is smaller than the inner side length of the coil outside. More specifically, it is assumed that the region from the outer end of the coil to the other end of the coil is a charging region, and the region from the outer side to the inner side of the coil that provides the wireless charging signal at the maximum intensity is the concentrated charging region. In this case, if the number of windings or inductance of the coil according to another embodiment and the conventional coil is the same, both the coil and the conventional coil according to another embodiment may have the same charging region as D3 or E3. The concentrated charging region C3 or C4 of the coil may be smaller than that of the conventional coil. As the concentrated charging region is smaller, the energy of the wireless charging signal provided by the concentrated charging region may increase. Accordingly, in the coil according to another embodiment, when the charging device is located in the charging region, the transmission efficiency of the wireless charging signal is increased compared to the conventional coil.

In addition, in the coil according to another embodiment, a stepped portion 2012 extending from the first coil 2010 or the second coil 2020 may be disposed in the coil hole 2031 of the shielding material 2030. More specifically, the coil wire or the coil pattern of the first coil 2010 is bent and inserted into one side of the coil hole 2031 at the bottom of the shielding material 2030, and exits and bends out of the coil hole 2031 to the other side of the shielding material 2030. It may be disposed on the upper surface of the). In this case, the stepped portion 2012 may be a coil line or a coil pattern disposed in the coil hole 2031. Therefore, the coil may be disposed in one coil line or coil pattern without separating the first coil 2010 and the second coil 2020.

Therefore, another embodiment can provide a coil device having excellent heat dissipation efficiency. In addition, another embodiment may provide a coil device having excellent wireless power transmission efficiency. Still another embodiment can provide a coil device with a simple structure. Yet another embodiment may provide a coil device having a plurality of charging directions.

<Another Example  According to coil device>

17 is a cross-sectional view illustrating a coil of a coil device according to still another embodiment.

The coil device according to another embodiment may be at least one of a transmitting coil of the wireless power transmission device or a receiving coil of the wireless power receiving device. In addition, the present invention is not limited to the wireless power transmission device, but may be applied to a device using a coil for wirelessly transferring induced electromotive force.

In another embodiment according to FIG. 17, a heat dissipation sheet 2150 may be added to the coil device according to FIGS. 14 to 16.

Referring to FIG. 17, a coil according to another embodiment may include a first shielding layer 2130, a second shielding layer, and a heat dissipation sheet 2150 between the first coil 2110 and the second coil 2120. Can be. More specifically, the first shielding layer 2130 may be located above the first coil 2110. The second shielding layer 2140 may be located below the second coil 2120. The heat dissipation sheet 2150 may be disposed between the first shielding layer 2130 and the second shielding layer 2150.

The heat dissipation sheet 2150 may be made of a material having high thermal conductivity. More specifically, the heat dissipation sheet 2150 may include a metal material or a non-metal material. For example, the metal material may be Al. The nonmetallic material may be ceramic. Therefore, the heat dissipation sheet 2150 may efficiently dissipate heat generated from the first coil 2110 or the second coil 2120.

FIG. 18 is a diagram illustrating three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils, according to an exemplary embodiment.

Referring to FIG. 18, when each of the three coils included in the wireless power transmitter has different inductances, three coils including a capacitor for generating the same resonant frequency as the three drive circuits 4110 connected to each coil are included. LC resonant circuit 4120 is required.

Even if the wireless power transmitter includes a plurality of coils, the resonant frequency generated by the wireless power transmitter to perform power transmission cannot be different for each of the transmitting coils, and should be in accordance with the standard resonant frequency supported by the wireless power transmitter.

The resonant frequency generated by the LC resonant circuit 4120 may vary according to the inductance of the coil and the capacitance of the capacitor.

For example, if the resonant frequency (fr, resonant frequency) may be 100Khz, and the capacitance of the capacitor connected to the coil to generate the resonance frequency is 200nF, to use only one capacitor, all three coils are 12.5. uH must be satisfied. If the inductances of the three coils are different from each other, three capacitors having different capacitances are required to generate a resonance frequency of 100 kHz. In addition, three drive circuits 4110 including an inverter for applying an alternating voltage in each LC resonant circuit 4120 are also required.

FIG. 19 is a diagram for describing a wireless power transmitter including a plurality of coils and a single drive circuit, according to an exemplary embodiment.

Referring to FIG. 19, when three coils of the wireless power transmitter have the same inductance, the wireless power transmitter may include only one drive circuit 4210, and the wireless power receiver among one drive circuit 4210 and three coils. The switch 4230 may be controlled to connect the coil of the wireless power transmitter with the coil having the highest power transmission efficiency.

Compared with FIG. 18, the wireless power transmitter can reduce the area occupied by components by using only one drive circuit 4210, thereby miniaturizing the wireless power transmitter itself, and reducing raw material costs required for manufacturing. .

In one embodiment, the wireless power transmitter may use the signal strength indicator in the ping step to calculate the power transfer efficiency between the three coils of the wireless power transmitter and the coil of the wireless power receiver.

Alternatively, in another embodiment, the wireless power transmitter may select a coil of the wireless power transmitter having a high coupling coefficient by calculating a coupling coefficient between the transmission and reception coils.

Alternatively, in another embodiment, the wireless power transmitter may control the switch 4230 to calculate a factor (Q factor) to identify a coil of the wireless power transmitter having a high factor and to connect with the drive circuit 4210.

20 is a diagram for describing a plurality of switches connecting one of a plurality of transmission coils to a drive circuit according to an exemplary embodiment.

Referring to FIG. 20, the power transmitter includes a drive circuit 4310 for converting an input voltage, a switch 4320 for connecting the drive circuit 4310 and an LC resonant circuit, a plurality of transmission coils 4330, and a plurality of wireless power transmitters. One capacitor 4340 connected in series with the coil of the control unit 4320 may include a control unit 4350 to control the opening and closing.

The controller 4350 identifies a coil of the wireless power receiver and a coil of the wireless power transmitter having the highest power transmission efficiency among the plurality of coils 4330 of the wireless power transmitter, and drives the coil of the identified wireless power transmitter in the drive circuit 4310. Control to close the switch to connect the

The method according to the embodiment described above may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape , Floppy disks, optical data storage devices, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).

The computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above-described method may be easily inferred by programmers in the art to which the embodiments belong.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (10)

1. A first coil disposed in the first layer; And

   A second coil that is over the first coil and disposed in a second layer and extending from the first coil;

   The coil device, wherein the first coil and the second coil are disposed to cross.
2. The method of claim 1,

   The coil device further comprises a first adhesive layer disposed between the first coil and the second coil.
3. The method of claim 2,

   The first adhesive layer includes a coil hole,

   The coil device is connected to the first coil and the second coil through the coil hole.
4. The method of claim 1,

   A first extension line extending from the first coil; And

   Further comprising a second extension line extending from the second coil,

   And the first extension line and the second extension line are disposed in the same area.
5. The method of claim 1,

   The first coil includes a coil wire spaced apart from each other,

   The second coil comprises a coil wire spaced apart from each other.
6. The method of claim 6,

   The coil device is arranged so that the first coil and the second coil do not overlap.
7. The method of claim 1,

   Board; And

   It further comprises a shielding material disposed on the substrate,

   The coil device is disposed on the shielding material.
8. The method of claim 1,

   A coil device in which the shapes of the first coil and the second coil are not the same.
9. The method of claim 1,

   A coil device in which the number of turns of the first coil and the second coil is not equal.
10. The method of claim 1,

    A coil device in which the turn direction of the first coil and the turn direction of the second coil are not the same.

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