WO2018074769A1 - Dispositif de bobine, procédé de production de dispositif de bobine, et émetteur et récepteur de puissance sans fil comprenant un dispositif de bobine - Google Patents

Dispositif de bobine, procédé de production de dispositif de bobine, et émetteur et récepteur de puissance sans fil comprenant un dispositif de bobine Download PDF

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Publication number
WO2018074769A1
WO2018074769A1 PCT/KR2017/011097 KR2017011097W WO2018074769A1 WO 2018074769 A1 WO2018074769 A1 WO 2018074769A1 KR 2017011097 W KR2017011097 W KR 2017011097W WO 2018074769 A1 WO2018074769 A1 WO 2018074769A1
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WO
WIPO (PCT)
Prior art keywords
coil
wireless power
planar
planar coil
power
Prior art date
Application number
PCT/KR2017/011097
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English (en)
Korean (ko)
Inventor
임성현
Original Assignee
엘지이노텍 주식회사
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Publication of WO2018074769A1 publication Critical patent/WO2018074769A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/027—Coils wound on non-magnetic supports, e.g. formers wound on formers for receiving several coils with perpendicular winding axes, e.g. for antennae or inductive power transfer

Definitions

  • the present invention relates to a coil device, a method of manufacturing the coil device, and a wireless power transmission / reception device including the 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.).
  • wireless power transmission method eg, electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method, etc.
  • 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.
  • the electromagnetic induction wireless power transmission standard may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) or / and the Power Matters Alliance (PMA).
  • 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.
  • the electromagnetic resonance method may include a wireless charging technology of a resonance method defined in an A4WP (Alliance for Wireless Power) standard device, which is a wireless charging technology standard device.
  • 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.
  • Coils used in wireless charging systems are expensive compared to other parts.
  • the coil has a problem that the charging efficiency is lowered by increasing the resistance when the thickness is reduced.
  • the present invention has been devised to solve the above problems of the prior art, and an object of the present invention is to provide a coil device using a planar coil, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention also provides a coil device including a low cost planar coil, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention provides a coil device including a planar coil that is easy to mass-produce, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention is to provide a coil device including a flat coil having a thin thickness and a low resistance value, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention also provides a coil device including a planar coil having a uniform resistance value, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention also provides a coil device including a planar coil excellent in electromagnetic interference shielding, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention also provides a coil device including a planar coil integrated with a shielding material, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • the present invention also provides a coil device including a plurality of planar coils, a method of manufacturing the coil device, and a wireless power transmission / reception device including the coil device.
  • a coil device includes a substrate; A shield disposed on the substrate; And a planar coil disposed on the shielding material by extending a coil wire and turning a plurality of turns.
  • the planar coil may be spaced apart from each other.
  • the planar coil may be a bare copper wire.
  • the planar coil may be formed by a pressing process.
  • the planar coil may be arranged in a circular spiral shape or a square spiral shape.
  • the cross section of the coil wire may have a right angle shape.
  • the coil wires may be arranged on both sides of an upper surface thereof.
  • Coil device may be arranged with a depth increases as the thickness of the flat coil is thicker.
  • planar coil may be plated on one surface.
  • an EMI shield may be disposed on one surface of the planar coil.
  • planar coil may be integrated with the shielding material.
  • the planar coil may be arranged in a plurality of layers.
  • a first coil is disposed on a first layer
  • a second coil is disposed on a second layer
  • an insulating layer is disposed between the first coil and the second coil.
  • the first coil and the second coil may be connected through a hole in the insulating layer.
  • a plurality of planar coils may be provided, and at least one of the plurality of planar coils may overlap each other.
  • a coil device including a substrate, a shield disposed on the substrate and a plane coil disposed on the shield; And a drive circuit connected to the planar coil, wherein the planar coil may provide a wireless power transmission apparatus in which coil lines are extended and arranged a plurality of turns, and the coil lines are spaced apart from each other.
  • a coil device including a substrate, a shield disposed on the substrate and a plane coil disposed on the shield; And a control circuit connected to the planar coil, wherein the planar coil may provide a wireless power receiver in which a coil line is extended and arranged a plurality of turns, and the coil lines are spaced apart from each other.
  • planar coil As another solution to the above problem, forming a planar coil; Disposing a shield on the substrate; And arranging planar coils on the shielding material, wherein the planar coils may provide a method of manufacturing a coil device in which the coil lines are spaced apart from each other.
  • a method of manufacturing a coil device may include preparing a flat plate made of a metal material.
  • a method of manufacturing a coil device may further include forming the planar coil by pressing the flat plate.
  • a method of manufacturing a coil device may include forming a first flat plate of a metal material.
  • a method of manufacturing a coil device may further include forming a second flat plate by plating the first flat plate or arranging an EMI shield.
  • a method of manufacturing a coil device may further include forming the planar coil by pressing the second flat plate.
  • the planar coil may be a bare copper wire.
  • the coil wires may be arranged on both upper surfaces thereof.
  • a coil device may be disposed such that its depth increases as the thickness of the planar coil increases.
  • the present invention can provide a low cost planar coil.
  • the present invention can provide a planar coil capable of mass production.
  • the present invention can provide a planar coil having a small thickness and high resistance value and low resistance value.
  • the present invention can provide a planar coil excellent in blocking electromagnetic interference.
  • the plane coil is integrated with the shielding material so that the plane coil can be fixed without a separate configuration.
  • the present invention allows the planar coil to be protected from external impact by an integrated shield.
  • the present invention may have a flat coil has heat resistance by the integrated shielding material.
  • the present invention can have a wider charging area by using a plurality of transmission coils, so that user convenience is high.
  • the present invention can use only one of a plurality of the same circuit can reduce the size of the wireless power transmitter itself, there is a cost reduction effect is reduced by the components used.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment.
  • FIG. 2 is a block diagram illustrating a wireless charging system according to another embodiment.
  • FIG. 3 is a diagram for describing a detection signal transmission procedure in a wireless charging system according to an embodiment.
  • FIG. 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 PMA standard.
  • FIG. 6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.
  • FIG. 7 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 6.
  • FIG. 8 is a diagram illustrating a packet format according to a wireless power transfer procedure of an electromagnetic induction method, according to an embodiment.
  • FIG. 9 is a diagram illustrating a type of a packet that can be transmitted in a ping step by a wireless power receiver according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
  • FIG. 10 is a diagram illustrating a message format of an identification packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
  • FIG. 11 illustrates a message format of a configuration packet and a power control suspend packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
  • FIG. 12 is a diagram for describing a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiver according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
  • FIG. 13 is a diagram for describing a coil device, according to an exemplary embodiment.
  • FIG. 14 is a view for explaining the manufacturing method of the coil device of FIG.
  • FIG. 15 is a view for explaining a cross section of the planar coil in the coil device of FIG. 14.
  • 16 is a diagram for describing a coil device, according to another exemplary embodiment.
  • 17 is a view for explaining the manufacturing method of the coil device of FIG.
  • FIG. 18 is a view for explaining a cross section of the planar coil in the coil device of FIG. 17.
  • FIG. 19 is a diagram for describing a coil device, according to another embodiment.
  • FIG. 20 is a diagram for describing a planar coil, according to another exemplary embodiment.
  • 21 is a diagram for describing a coil device, according to another embodiment.
  • 22 is a diagram for explaining a coil device according to another embodiment.
  • FIG. 23 is an exploded perspective view for explaining the coil device of FIG. 22.
  • FIG. 24 is a diagram for describing a coil device, according to another embodiment.
  • FIG. 25 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. 26 illustrates a wireless power transmitter including a plurality of coils and a single drive circuit, according to an exemplary embodiment.
  • FIG. 27 is a diagram illustrating a drive circuit including a full-bridge inverter according to an embodiment.
  • FIG. 28 is a diagram illustrating a plurality of switches connecting one of a plurality of transmission coils to a drive circuit according to an exemplary embodiment.
  • 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.
  • the apparatus for transmitting wireless power on the wireless power charging system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a wireless power transmitter for convenience of description.
  • a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver terminal, etc. may be used interchangeably as a representation of an apparatus for receiving wireless power from a wireless power transmitter.
  • Wireless charging apparatus 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.
  • AP access point
  • AP small base station
  • stand a stand
  • ceiling buried
  • wall etc.
  • 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 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 may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters.
  • the wireless power transmission method may include at least one of the electromagnetic induction method, electromagnetic resonance method, RF wireless power transmission method.
  • the wireless power receiving means supporting the electromagnetic induction method may include a wireless charging technology of the electromagnetic induction method defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA) which are wireless charging technology standard organizations.
  • the wireless power receiving means supporting the electromagnetic resonance method may include a wireless charging technology of the resonance method defined in the A4WP (Alliance for Wireless Power) standard mechanism that is a wireless charging technology standard mechanism.
  • A4WP Alliance for Wireless Power
  • 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.
  • 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.
  • 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.
  • the wireless power transmitter may calculate the charging efficiency or the power transmission efficiency based on the received power strength information.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment.
  • a wireless charging system includes a wireless power transmitter 10 that 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.
  • 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.
  • the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication in which information is exchanged using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.
  • 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.
  • the status information and control information exchanged between the transceivers will be more apparent through the description of the embodiments to be described later.
  • the in-band communication and the out-of-band communication may provide bidirectional communication, but 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.
  • unidirectional communication may be the wireless power receiver 20 to transmit information only to the wireless power transmitter 10, but is not limited thereto.
  • the wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.
  • 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 may obtain various state information of the electronic device 30.
  • 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.
  • the wireless power transmitter 10 may transmit a predetermined packet indicating whether to support fast charging to the wireless power receiver 20.
  • the wireless power receiver 20 may notify the electronic device 30 when it is determined that the connected wireless power transmitter 10 supports the fast charging mode.
  • the electronic device 30 may indicate that fast charging is possible through predetermined display means provided, for example, it may be a liquid crystal display.
  • the user of the electronic device 30 may control the wireless power transmitter 10 to operate in the fast charge mode by selecting a predetermined fast charge request button displayed on the liquid crystal display means.
  • the electronic device 30 may transmit a predetermined fast charge request signal to the wireless power receiver 20.
  • the wireless power receiver 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the charging mode packet to the wireless power transmitter 10 to convert the normal low power charging mode into the fast charging mode.
  • FIG. 2 is a block diagram illustrating a wireless charging system according to another embodiment.
  • 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.
  • the wireless power transmitter 10 may distribute and transmit power to a plurality of wireless power receivers in a time division manner, but is not limited thereto.
  • 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.
  • the number of wireless power receivers that can be connected to one wireless power transmitter 10 may include at least one of a required power amount for each wireless power receiver, a battery charge state, power consumption of an electronic device, and available power amount of the wireless power transmitter. Can be adaptively determined based on the
  • the wireless power transmitter 10 may be configured with a plurality of wireless power transmitters.
  • the wireless power receiver 20 may be simultaneously connected to a plurality of wireless power transmitters, and may simultaneously receive power from the connected wireless power transmitters and perform charging.
  • the number of wireless power transmitters connected to the wireless power receiver 20 may be adaptively based on the required power amount of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, the available power amount of the wireless power transmitter, and the like. Can be determined.
  • FIG. 3 is a diagram for describing a detection signal transmission procedure in a wireless charging system according to an embodiment.
  • 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.
  • 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.
  • 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 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.
  • 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. .
  • FIG. 4 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
  • 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.
  • 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).
  • 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.
  • 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).
  • a response signal for example, a signal strength indicator
  • the transmitter may transition to the identification and configuration step 430 for collecting receiver identification and receiver configuration and status information (S404).
  • 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).
  • the transmitter may transition to a power transmission step 440 for transmitting wireless power (S406).
  • 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).
  • 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.
  • 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 PMA standard.
  • power transmission from a transmitter to a receiver according to the PMA standard is largely performed in a standby phase (Standby Phase, 510), a digital ping phase (520), an identification phase (Identification Phase, 530), and power transmission. It may be divided into a power transfer phase 540 and an end of charge phase 550.
  • the waiting step 510 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.
  • specific errors and specific events will be apparent from the following description.
  • the transmitter may monitor whether an object exists on a 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 520 (S501).
  • RXID is a unique identifier assigned to a PMA compatible receiver.
  • 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 digital ping step 520 sends a digital ping signal to identify whether the detected object is a PMA compatible receiver.
  • the receiver may modulate the received digital ping signal according to the PMA communication protocol to transmit a predetermined response signal to the transmitter.
  • the response signal may include a signal strength indicator indicating the strength of the power received by the receiver.
  • the transmitter may transition to the identification step 530 (S502).
  • the transmitter may transition to the standby step 510.
  • the Foreign Object may be a metallic object including coins, keys, and the like.
  • the transmitter may transition to the waiting step 510 if the receiver identification procedure fails or the receiver identification procedure needs to be re-executed and if the receiver identification procedure has not been completed for a predefined time ( S504).
  • the transmitter transitions to the power transmission step 540 in the identification step 530 and starts charging (S505).
  • the transmitter goes to standby step 510 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 (S506).
  • the transmitter may transition to the charging completion step 550 (S507).
  • the transmitter may transition to the standby state 510 (S509).
  • the transmitter may transition from the charging completion step 550 to the digital ping step 520 (S510).
  • the transmitter when the transmitter receives an end of charge (EOC) request from the receiver, the transmitter may transition to the charging completion step 550 (S508 and S511).
  • EOC end of charge
  • FIG. 6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.
  • the wireless power transmitter 600 may largely include a power converter 610, a power transmitter 620, a communication unit 630, a controller 640, and a sensor 650.
  • the configuration of the wireless power transmitter 600 is not necessarily an essential configuration, and may include more or fewer components.
  • the power converter 610 may perform a function of converting the power into power of a predetermined intensity.
  • the power converter 610 may include a DC / DC converter 611 and an amplifier 612.
  • the DC / DC converter 611 may perform a function of converting DC power supplied from the power supply unit 660 into DC power having a specific intensity according to a control signal of the controller 640.
  • the sensing unit 650 may measure the voltage / current of the DC-converted power and provide the same to the control unit 640. In addition, the sensing unit 650 may measure the internal temperature of the wireless power transmitter 600 to determine whether overheating occurs, and provide the measurement result to the controller 640. For example, the controller 640 may adaptively block power supply from the power supply unit 650 or block power supply to the amplifier 612 based on the voltage / current value measured by the sensing unit 650. Can be. To this end, one side of the power converter 610 may be further provided with a predetermined power cut-off circuit for cutting off the power supplied from the power supply unit 650, or cut off the power supplied to the amplifier 612.
  • the amplifier 612 may adjust the intensity of the DC / DC converted power according to the control signal of the controller 640.
  • the controller 640 may receive power reception state information or (and) power control signal of the wireless power receiver through the communication unit 630, and may be based on the received power reception state information or (and) power control signal.
  • the amplification factor of the amplifier 612 can be dynamically adjusted.
  • 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 620 may include a multiplexer 621 (or a multiplexer) and a transmission coil 622.
  • the power transmitter 620 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 612 received through the multiplexer 621 into AC power having a specific frequency.
  • the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer 621 to generate AC power.
  • this is only one embodiment, and the other example is before the amplifier 612. Note that it may be mixed in stages or later.
  • Frequency of AC power delivered to each transmission coil 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.
  • the wireless power transmitter may include the plurality of transmission coils. 21 to 23 illustrate a case in which power is transmitted using the same resonant frequency, even if including.
  • the power transmitter 620 includes a multiplexer 621 and a plurality of transmit coils 622—that is, a first to control the output power of the amplifier 612 to be transmitted to the transmit coil. To n-th transmission coils.
  • the controller 640 may transmit power through time division multiplexing for each transmission coil.
  • 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 640 may control the multiplexer 621 to control power to be transmitted through a specific transmission coil in a specific time slot.
  • 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 612 of the wireless power receiver may be controlled to transmit power.
  • the controller 640 may control the multiplexer 621 to sequentially transmit the sensing signals through the first to nth transmitting coils 622 during the first sensing signal transmission procedure.
  • the controller 640 may identify a time point at which the detection signal is transmitted by using the timer 655.
  • the control unit 640 controls the multiplexer 621 to detect the detection signal through the corresponding transmission coil. Can be controlled to be sent.
  • the timer 650 may transmit a specific event signal to the controller 640 at a predetermined period during the ping transmission step.
  • the controller 640 controls the multiplexer 621 to transmit the specific event signal.
  • the digital ping can be sent through the coil.
  • control unit 640 stores a predetermined transmission coil identifier and a corresponding transmission coil for identifying which transmission coil has received a signal strength indicator from the demodulator 632 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 640 controls the multiplexer 621 so that the detection signal may be transmitted 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 controller 640 transmits the second sensed signal to the transmit 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 intensity indicator is received during the first sensed signal transmit procedure. In the procedure, the sensing signal may be determined as the transmitting coil to be transmitted first, and the multiplexer 621 may be controlled according to the determination result.
  • the modulator 631 may modulate the control signal generated by the controller 640 and transmit the modulated control signal to the multiplexer 621.
  • 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.
  • the demodulator 632 may demodulate the detected signal and transmit the demodulated signal to the controller 640.
  • 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.
  • EC error correction
  • EOC end of charge
  • the present invention is not limited thereto, and may include various state information for identifying a state of the wireless power receiver.
  • the demodulator 632 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 640 with a predetermined transmission coil identifier corresponding to the identified transmission coil.
  • the wireless power transmitter 600 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.
  • the wireless power transmitter 600 may not only transmit wireless power using the transmission coil 622 but also exchange various information with the wireless power receiver through the transmission coil 622.
  • the wireless power transmitter 600 further includes a separate coil corresponding to each of the transmission coils 622 (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.
  • the wireless power transmitter 600 and the wireless power receiver perform in-band communication by way of example.
  • 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.
  • the short-range bidirectional communication may be any one of low power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.
  • the wireless power transmitter 600 may adaptively provide a fast charging mode and a general low power charging mode according to a request of the wireless power receiver.
  • the wireless power transmitter 600 may transmit a signal of a predetermined pattern-a business card called a first packet-for convenience of description.
  • the wireless power receiver 600 may identify that the wireless power transmitter 600 being connected is capable of fast charging.
  • the wireless power receiver may transmit a predetermined first response packet to the wireless power transmitter 600 requesting fast charging.
  • the wireless power transmitter 600 may automatically switch to the fast charging mode and start fast charging.
  • the first packet is transmitted through the transmission coil 622.
  • the first packet may be sent in the identification and configuration step 430 of FIG. 4 or the identification step 530 of FIG. 5.
  • information for identifying whether fast charging is supported may be encoded and transmitted in the digital ping signal transmitted by the wireless power transmitter 600.
  • the wireless power receiver may transmit a predetermined charging mode packet to the wireless power transmitter 600 in which the charging mode is set to fast charging.
  • the wireless power transmitter 600 and the wireless power receiver may control an internal operation so that power corresponding to the fast charging mode may be transmitted and received.
  • the over voltage judgment criteria, the over temperature judgment criteria, the low voltage / high voltage judgment criteria, the optimum voltage Values such as level (Optimum Voltage Level), power control offset, etc. may be changed and set.
  • the threshold voltage for determining the overvoltage may be set to be high to enable fast charging.
  • the threshold temperature may be set to be high in consideration of the temperature rise due to the fast charging.
  • the power control offset value which means the minimum level at which power is controlled in the transmitter, may be set to a larger value than the general low power charging mode so that the power control offset value may quickly converge to a desired target power level in the fast charging mode.
  • FIG. 7 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 6.
  • the wireless power receiver 700 includes a receiving coil 710, a rectifier 720, a DC / DC converter 730, a load 740, a sensing unit 750, and a communication unit ( 760), and may include a main controller 770.
  • the communication unit 760 may include at least one of a demodulator 761 and a modulator 762.
  • the wireless power receiver 700 illustrated in the example of FIG. 7 is illustrated as being capable of exchanging information with the wireless power transmitter 600 through in-band communication, this is only one embodiment.
  • the communication unit 760 according to the embodiment may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.
  • the AC power received through the receiving coil 710 may be transferred to the rectifier 720.
  • the rectifier 720 may convert AC power into DC power and transmit the DC power to the DC / DC converter 730.
  • the DC / DC converter 730 may convert the strength of the rectifier output DC power into a specific intensity required by the load 740 and then transfer it to the load 740.
  • the receiving coil 710 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 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.
  • the sensing unit 750 may measure the intensity of the rectifier 720 output DC power and provide the same to the main controller 770. In addition, the sensing unit 750 may measure the strength of the current applied to the receiving coil 710 according to the wireless power reception, and may transmit the measurement result to the main controller 770. In addition, the sensing unit 750 may measure the internal temperature of the wireless power receiver 700 and provide the measured temperature value to the main controller 770.
  • the main controller 770 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 762.
  • the signal modulated by the modulator 762 may be transmitted to the wireless power transmitter 600 through the receiving coil 710 or a separate coil (not shown).
  • the main controller 770 may determine that a sensing signal has been received. When the sensing signal is received, a signal strength indicator corresponding to the sensing signal may be modulated.
  • the demodulator 761 demodulates an AC power signal or a rectifier 720 output DC power signal between the receiving coil 710 and the rectifier 720 to identify whether a detection signal is received, and then, the main subject of the identification result. It may be provided to the unit 770. In this case, the main controller 770 may control the signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 762.
  • FIG. 8 is a diagram illustrating a packet format according to a wireless power transfer procedure of an electromagnetic induction method, according to an exemplary embodiment.
  • a packet format 800 used for exchanging information between a wireless power transmitter and a wireless power receiver includes a preamble 810 for acquiring synchronization for demodulation of a corresponding packet and identifying a correct start bit of the corresponding packet.
  • a header 820 for identifying the type of a message included in the packet
  • a message (Message, 830) field for transmitting the contents (or payload) of the packet
  • a corresponding packet It may be configured to include a checksum (840) field for identifying whether an error has occurred.
  • the packet receiver may identify the size of the message 830 included in the packet based on the header 820 value.
  • header 820 may be defined in each step of the wireless power transmission procedure, and in some, the same value may be defined in different steps of the header 820.
  • header values corresponding to end power transfer of the ping step and end of power transfer of the power transfer step may be equal to 0x02.
  • the message 830 includes data to be transmitted by the transmitter of the packet.
  • the data included in the message 830 field may be a report, a request, or a response to the counterpart, but is not limited thereto.
  • the packet 700 may further include at least one of transmitter identification information for identifying a transmitter that transmitted the packet and receiver identification information for identifying a receiver to receive the packet.
  • the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like, but are not limited thereto.
  • the transmitter identification information and the receiver identification information may be information capable of distinguishing a receiver and a transmitter on a wireless charging system.
  • the packet 800 may further include predetermined group identification information for identifying the corresponding reception group when the packet is to be received by a plurality of devices.
  • FIG. 9 is a diagram for describing a type of a packet that can be transmitted in a ping step by a wireless power receiver according to an electromagnetic induction wireless power transmission procedure according to one embodiment.
  • the wireless power receiver may transmit a signal strength packet or a power transmission stop packet.
  • a message format of a signal strength packet may be configured as a signal strength value having a size of 1 byte.
  • the signal strength value may indicate a degree of coupling between the transmitting coil and the receiving coil, and is calculated based on the rectifier output voltage in the digital ping period, the open circuit voltage measured by the output disconnect switch, the intensity of the received power, and the like. It may be a value.
  • the signal strength value may range from a minimum of 0 to a maximum of 255, and may have a value of 255 when the actual measured value U for a particular variable is equal to the maximum value Umax of the variable.
  • the signal strength value may be calculated as U / Umax * 256.
  • a message format of a power transmission interruption packet may be configured as an end power transfer code having a size of 1 byte.
  • the reason why the wireless power receiver requests the wireless power transmitter to stop power transmission is because of charge complete, internal fault, over temperature, over voltage, over current, and battery. It may include, but is not limited to, Battery Failure, Reconfigure, and No Response. It should be noted that the power transfer abort code may be further defined in response to each new power transfer abort reason.
  • the charging completion may be used that the charging of the receiver battery is completed.
  • Internal errors can be used when a software or logical error in receiver internal operation is detected.
  • the overheat / overvoltage / overcurrent can be used when the temperature / voltage / current values measured at the receiver exceed the thresholds defined for each.
  • Battery damage can be used if it is determined that a problem has occurred with the receiver battery.
  • Reconfiguration can be used when renegotiation for power transfer conditions is required. No response may be used if it is determined that the transmitter's response to the control error packet, i.e., to increase or decrease the power strength, is not normal.
  • FIG. 10 is a diagram for describing a message format of an identification packet according to an electromagnetic induction wireless power transmission procedure according to one embodiment.
  • a message format of an identification packet includes a version information field, a manufacturer information field, an extension indicator field, and a basic device identification information field. Can be configured.
  • revision version information of a standard applied to a corresponding wireless power receiver may be recorded.
  • a predetermined identification code for identifying the manufacturer who manufactured the corresponding wireless power receiver may be recorded.
  • the extension indicator field may be an indicator for identifying whether an extension identification packet including extension device identification information exists. For example, if the extension indicator value is 0, it may mean that there is no extension identification packet. If the extension indicator value is 1, it may mean that the extension identification packet is present after the identification packet.
  • the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information and basic device identification information.
  • the extended indicator value is 1
  • the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information, basic device identification information and extended device identification information.
  • FIG. 11 illustrates a message format of a configuration packet and a power control suspend packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
  • a message format of a configuration packet may have a length of 5 bytes, and includes a power class field, a maximum power field, and a power control field. , A count field, a window size field, a window offset field, and the like.
  • the power class assigned to the wireless power receiver may be recorded in the power class field.
  • the strength value of the maximum power that can be provided by the rectifier output of the wireless power receiver may be recorded.
  • the maximum power amount Pmax desired to be provided at the rectifier output of the wireless power receiver may be calculated as (b / 2) * 10 a .
  • the power control field may be used to indicate according to which algorithm the power control in the wireless power transmitter should be made. For example, if the power control field value is 0, this means that the power control algorithm is defined in the standard, and if the power control field value is 1, it may mean that power control is performed according to an algorithm defined by the manufacturer.
  • the count field may be used to record the number of option configuration packets to be transmitted by the wireless power receiver in the identification and configuration steps.
  • the window size field may be used to record the window size for calculating the average received power.
  • the window size may be a positive integer value greater than 0 and having a unit of 4 ms.
  • the window offset field may record information for identifying the time from the end of the average received power calculation window to the start of the transmission of the next received power packet.
  • the window offset may be a positive integer value greater than 0 and having a unit of 4 ms.
  • a message format of a power control hold packet may be configured to include a power control hold time T_delay.
  • a plurality of power control pending packets may be sent during the identification and configuration phase. For example, up to seven power control pending packets may be transmitted.
  • the power control hold time T_delay may have a value between a predefined power control hold minimum time T_min: 5 ms and a power control hold maximum time T_max: 205 ms.
  • the apparatus for transmitting power wirelessly may perform power control by using the power control holding time of the last power control holding packet received in the identification and configuration step.
  • the wireless power transmitter may use the T_min value as the T_delay value when the power control pending packet is not received in the identification and configuration steps.
  • the power control holding time may refer to a time during which the wireless power transmitter waits without performing power control after receiving the most recent control error packet and before performing the actual power control.
  • FIG. 12 is a diagram for describing a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiver according to an electromagnetic induction wireless power transmission procedure according to one embodiment.
  • a packet transmittable by a wireless power receiver in a power transmission step includes a control error packet, an end power transfer packet, a received power packet, and a charging state. It may include a packet (Charge Status Packet), a packet defined by the manufacturer.
  • Reference numeral 1201 shows a message format of a control error packet composed of a control error value of 1 byte.
  • the control error value may be an integer value in the range of -128 to +127. If the control error value is negative, the power output of the wireless power transmitter may be lowered. If the control error value is negative, the power output of the wireless power transmitter may increase.
  • Reference numeral 1202 shows a message format of an End Power Transfer Packet composed of one byte of an End Power Transfer Code.
  • Reference numeral 1203 shows a message format of a received power packet composed of a received power value of 1 byte.
  • the received power value may correspond to the average rectifier received power value calculated during the predetermined period.
  • the actual received power amount P received may be calculated based on a maximum power and a power class included in the configuration packet 1001. For example, the actual received power amount may be calculated by (received power value / 128) * (maximum power / 2) * (10 power rating ).
  • Reference numeral 1204 shows a message format of a charge status packet composed of a charge status value of 1 byte.
  • the charge state value may indicate a battery charge of the wireless power receiver.
  • the charge state value 0 may mean a fully discharged state
  • the charge state value 50 may indicate a 50% charge state
  • the charge state value 100 may mean a full state. If the wireless power receiver does not include the rechargeable battery or cannot provide the charging status information, the charging status value may be set to OxFF.
  • FIG. 13 is a diagram for describing a coil device, according to an exemplary embodiment.
  • 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.
  • 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.
  • a coil device 1300 may include a substrate 1340.
  • the substrate 1340 may be a flexible substrate and may be a rigid substrate.
  • the coil device 1300 may include a shield 1330.
  • the shield 1330 may be disposed on an upper surface of the substrate 1340.
  • the shielding material 1330 may guide the wireless power generated from the planar coil 1310 disposed above the charging direction, and may protect various circuits disposed below from the electromagnetic field.
  • the coil device 1300 may include an adhesive material 1320.
  • the adhesive material 1320 may be disposed between the plane coil 1310 and the shielding material 1330 and may fix the plane coil 1310 by an adhesive force.
  • the adhesive material 1320 may be disposed as an adhesive member and may be combined with the plane coil 1310 to fix the plane coil 1310.
  • the coil device 1300 may include a planar coil 1310.
  • the planar coil 1310 may be an induction coil or a resonance coil.
  • the planar coil 1310 may include first and second coils, the first coil may be an induction coil, and the second coil may be a resonance coil.
  • the planar coil 1310 may be disposed on the substrate 1340 or on the shield 1320.
  • the planar coil 1310 of the coil device 1300 may be at least once in a spiral shape, a circle shape, an ellipse shape, a racetrack shape, a square shape, a triangular shape, or the like. It may be placed in a turn.
  • the planar coil 1310 may be disposed in a circular shape or a spiral shape. More specifically, the planar coil 1310 is disposed in an outer region and is circularly or spirally formed from one end 1311 to which an AC signal is applied or outputted and the other end 1312 to be disposed in an inner region and an AC signal is output or applied. It may be extended by turning a plurality of times.
  • the planar coil 1310 is disposed 13 turns in FIG. 13, the planar coil 1310 is not limited thereto.
  • planar coil 1310 of the coil device 1300 may be a bare copper wire. That is, the coil wire of the planar coil 1310 may not be coated with an insulator coating.
  • Coils formed in a plane using a conventional etching process has a complicated manufacturing process and limited mass production.
  • the coil formed by using the etching process has a limit in increasing the separation distance between the coil line in the nature of the etching process.
  • the coil formed by using the etching process has a lot of portions where the upper part of the coil wire is etched due to the etching process characteristics, the raw material was wasted.
  • the coil formed by using the etching process has a problem that the area is narrowed because the portion of the upper portion of the coil wire is etched to increase the resistance.
  • the coil formed using the etching process has a problem that the portion to be etched is irregular and the resistance uniformity is inferior.
  • the planar coil 1310 of the coil device 1300 may be formed by a pressing process.
  • the planar coil 1310 has a shape (for example, a spiral shape, a circular shape, an ellipse, etc.) designed by using a press process or the like on a flat plate made of metal as described in the manufacturing method of the coil device described later. Shape, racetrack shape, square shape, triangular shape, or the like). Accordingly, the planar coil 1310 may be disposed in a bare copper wire without coating. In addition, the planar coil 1310 may be disposed so that the coil wires are spaced apart from each other.
  • the planar coils 1310 may be spaced apart by a distance a1 because they may not function as coils or may change inductance values when they are in contact with each other. More specifically, the separation distance a1 may be 0.1 mm or more and 2.5 mm or less. More specifically, the separation distance a1 may be 0.7 mm.
  • the planar coil 1310 may have a rectangular cross section of the coil wire.
  • the flat coil 1310 may be arranged on the upper surface of both sides of the coil wire which is a cut portion due to the pressing process.
  • the thickness a2 of the coil wire of the planar coil 1310 may be 0.01 mm or more and 2.5 mm or less.
  • the width a3 of the coil wire of the planar coil 1310 may be 0.5 mm or more and 2 mm or less. For example, the width a3 of the coil wire of the planar coil 1310 may be 1.1 mm.
  • one embodiment can provide a low cost planar coil without using an expensive coil coated with a coil wire coated.
  • one embodiment may use a press process to provide a planar coil capable of mass production.
  • an embodiment may provide a planar coil having a smaller thickness than a coil formed by an etching process and having high uniformity of resistance value and low resistance value.
  • FIG. 14 is a view for explaining a method of manufacturing the coil device of FIG. 13, and FIG. 15 is a view for explaining a cross section of a planar coil in the coil device of FIG. 14.
  • a method of manufacturing a coil device may include forming a planar coil 1411.
  • a method of manufacturing a coil device may include disposing a shield on a substrate.
  • the method of manufacturing a coil device may include disposing an adhesive on a shield.
  • the method of manufacturing a coil device may include disposing a plane coil 1411 on an adhesive.
  • the forming of the planar coil 1411 may include preparing a metal plate 1410.
  • the plate 1410 may be a metal material or may include a metal material as long as the plate 1410 is a conductive material.
  • forming the planar coil 1411 may include forming the planar coil 1411 by pressing the flat plate 1410. More specifically, forming the flat coil 1411 by pressing the flat plate 1410 may be performed by removing an unnecessary portion of the flat plate 1410 to form a coil (eg, a spiral shape or a circular shape). , Elliptical shape, racetrack shape, square shape, triangular shape, etc.) may be left.
  • the planar coil 1411 may be formed in a spiral shape or a circular shape.
  • the forming of the planar coil 1411 may form not only one but also two or more planar coils 1411 by one flat plate 1410.
  • one embodiment can provide a low cost planar coil without using an expensive coil coated with a coil wire coated.
  • one embodiment may use a press process to provide a planar coil capable of mass production.
  • it is possible to reuse the plate removed in the pressing process to form a planar coil can save the manufacturing cost.
  • an embodiment may provide a planar coil having a smaller thickness than a coil formed by an etching process and having high uniformity of resistance value and low resistance value.
  • FIG. 15 is a cross-sectional view of the coil line I-II of the planar coil 1411 of FIG. 14B.
  • a hair may be formed to correspond to a portion to be cut on the coil wire. More specifically, the hair of the planar coil 1411 may have hairs of different depths depending on the thickness of the flat plate 1410. More specifically, the thickness of the flat coil 1411 may increase the depth of simulation as the thickness of the flat plate 1410 increases.
  • 15A to 15C show cross sections I to II of the planar coil 1411 according to the thickness of the planar coil 1411.
  • the planar coil 1411a corresponds to a part cut at an upper portion of the coil wire when the thickness of the coil wire is 1.0 mm or less, and is equal to 1/100 of the thickness of the coil wire.
  • the hair of the corresponding first depth b2 may be disposed.
  • the planar coil 1411b corresponds to a portion cut at an upper portion of the coil wire in one tenth of the thickness of the coil wire.
  • the hair of the corresponding second depth b4 may be disposed.
  • the planar coil 1411c may have a depth b6 corresponding to a portion cut at the top of the coil wire, corresponding to one fifth of the thickness of the coil wire. Can be.
  • 16 is a diagram for describing a coil device, according to another exemplary embodiment.
  • the coil device may be at least one of a transmitting coil of the wireless power transmitter or a receiving coil of the wireless power receiver.
  • 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.
  • a coil device 1500 may include a substrate 1540.
  • the substrate 1540 may be a flexible substrate and may be a rigid substrate.
  • the coil device 1500 may include a shield 1530.
  • the shield 1530 may be disposed on an upper surface of the substrate 1540.
  • the shielding material 1530 may guide the wireless power generated by the planar coil 1510 disposed above the charging direction, and may protect various circuits disposed below from the electromagnetic field.
  • the coil device 1500 may include an adhesive 1520.
  • the adhesive material 1520 may be disposed between the plane coil 1510 and the shielding material 1530 and fix the plane coil 1510 by an adhesive force.
  • the adhesive material 1520 may be disposed as an adhesive member and may be combined with the plane coil 1510 to fix the plane coil 1510.
  • Coil device 1500 may include a planar coil 1510.
  • the planar coil 1510 may be an induction coil or a resonance coil.
  • the planar coil 1510 may include first and second coils, the first coil may be an induction coil, and the second coil may be a resonance coil.
  • the planar coil 1510 may be disposed on the substrate 1540 or on the shielding material 1520.
  • the planar coil 1510 of the coil device 1500 may be at least once in a spiral shape, a circle shape, an ellipse shape, a racetrack shape, a square shape, a triangular shape, or the like. It may be placed in a turn.
  • the planar coil 1510 may be disposed in a circular shape or a spiral shape. More specifically, the planar coil 1510 is disposed in the outer region and is circularly or spirally formed from one end 1514 on which the AC signal is applied or output to the other end 1515 on the inner region and the AC signal is output or applied. It may be extended by turning a plurality of times.
  • the planar coil 1510 is disposed 13 turns, but is not limited thereto.
  • the planar coil 1510 of the coil device 1500 may be a copper wire to which a plated or EMI shielded shield is applied. More specifically, the planar coil 1510 may be plated on the top and the bottom or an EMI shield may be applied. In addition, the flat coil 1510 may be plated only at the top or the EMI shield may be applied, and only the bottom may be plated or the EMI shield may be applied.
  • the coil wire of the planar coil 1510 may include first portions 1511 to third portions 1513. First portion 1511 and third portion 1512 are formed by plating or EMI shielding application, and second portion 1512 is a bare copper wire.
  • the first portion 1511 may be disposed above the bare wire 1512, and the second portion 1513 may be disposed below the bare wire 1512. Therefore, by plating the planar coil, the electrical characteristics (such as reduced resistance) and physical characteristics (such as increased durability) of the coil can be changed according to the use environment.
  • EMI shields can be applied to planar coils to meet electromagnetic standards.
  • planar coil 1510 may not be coated with an insulator coating.
  • Coils formed in a plane using a conventional etching process has a complicated manufacturing process and limited mass production.
  • the coil formed by using the etching process has a limit in increasing the separation distance between the coil line in the nature of the etching process.
  • the coil formed by using the etching process has a lot of portions where the upper part of the coil wire is etched due to the etching process characteristics, the raw material was wasted.
  • the coil formed by using the etching process has a problem that the area is narrowed because the portion of the upper portion of the coil wire is etched to increase the resistance.
  • the coil formed using the etching process has a problem that the portion to be etched is irregular and the resistance uniformity is inferior.
  • the planar coil 1510 of the coil device 1500 may be formed by a pressing process.
  • the planar coil 1510 is a shape (for example, the spiral described above) designed by using a press process or the like on a plate of metal material plated on one or both surfaces, as described in the method of manufacturing a coil device described below. Shape, circle shape, ellipse shape, racetrack shape, square shape, triangular shape, or the like).
  • the planar coil 1510 may be disposed as a bare copper wire plated on one or both surfaces without a coating.
  • the coil coils 1510 may be disposed to be spaced apart from each other.
  • the planar coils 1510 may not be able to function as coils or may change inductance values when they contact each other, and thus may be spaced apart by the separation distance c1. More specifically, the separation distance c1 may be 0.1 mm or more and 2.5 mm or less. More specifically, the separation distance c1 may be 0.7 mm.
  • the cross section of the planar coil 1510 may have a rectangular shape.
  • the flat coil 1510 may be arranged on the upper surface of both sides of the coil wire which is a cut portion due to the pressing process.
  • the thickness c2 of the coil wire of the planar coil 1510 may be 0.01 mm or more and 2.5 mm or less.
  • the width c3 of the coil wire of the planar coil 1510 may be 0.5 mm or more and 2 mm or less.
  • the width c3 of the coil line of the planar coil 1510 may be 1.1 mm.
  • another embodiment can provide a low cost planar coil without using expensive coils coated with coil wires.
  • another embodiment may use a press process to provide a planar coil capable of mass production.
  • another embodiment may provide a planar coil having a thinner thickness than a coil formed by an etching process and having high uniformity of resistance value and low resistance value.
  • another embodiment may improve the electrical or physical properties by plating the coil wire.
  • an electromagnetic shield may be blocked by applying an EMI shield to the coil wire.
  • FIG. 17 is a view for explaining a method of manufacturing the coil device of FIG. 16, and FIG. 18 is a view for explaining a cross section of the planar coil in the coil device of FIG. 17.
  • a method of manufacturing a coil device may include forming a planar coil 1630.
  • a method of manufacturing a coil device may include disposing a shield on a substrate.
  • the method of manufacturing a coil device according to another embodiment may include disposing an adhesive on a shield.
  • the manufacturing method of the coil device according to another embodiment may include the step of placing the planar coil 1630 on the adhesive material.
  • the forming of the planar coil 1630 may include preparing a first flat plate 1610 made of metal. Since the first flat plate 1610 may be a conductive material, it may be a metal material or may include a metal material.
  • the forming of the planar coil 1630 may include plating the first flat plate 1610 or applying the EMI shield to generate the second flat plate 1620. More specifically, FIG. 17C is a cross-sectional view taken along line III-IV of the second flat plate 1620 in FIG. 17B.
  • the second flat plate 1620 may be plated 1621 on one or both surfaces of the first flat plate 1610.
  • the second flat plate 1620 may have an EMI shield applied to one or both surfaces of the first flat plate 1610.
  • the forming of the planar coil 1630 may include forming the planar coil 1630 by pressing the second flat plate 1620. More specifically, forming the planar coil 1630 by pressing the second flat plate 1620 may be performed by removing an unnecessary portion of the second flat plate 1620 to form a coil (eg, spiral). Shape, circle shape, ellipse shape, racetrack shape, square shape, triangular shape, etc.). For example, as illustrated in FIG. 17D, the planar coil 1630 may be formed in a spiral shape or a circular shape. In addition, the forming of the planar coil 1630 may include not only one but also two or more planar coils 1630 with one second flat plate 1620.
  • another embodiment can provide a low cost planar coil without using expensive coils coated with coil wires.
  • another embodiment may use a press process to provide a planar coil capable of mass production.
  • another embodiment can be used to form a flat coil by reusing the plate removed in the press process, thereby saving manufacturing costs.
  • another embodiment may provide a planar coil having a thinner thickness than a coil formed by an etching process and having high uniformity of resistance value and low resistance value. Another embodiment simplifies the process of applying a plating or EMI shield to a planar coil.
  • FIG. 18 is a cross-sectional view of the coil line V-VI of the planar coil 1630 of FIG. 17D.
  • a hair may be formed to correspond to a portion to be cut on the coil wire. More specifically, the hair of the planar coil 1630 may have a hair of a different depth depending on the thickness of the flat plate 1630. More specifically, the thickness of the flat coil 1630 may increase as the thickness of the flat plate 1630 increases.
  • 18A to 18C show cross-sectional views of V to VI in the planar coil 1630 according to the thickness of the planar coil 1630.
  • the planar coil 1630a includes a first portion 1631a or a third portion 1633a to which a plating or EMI shield is applied, and may include a second portion 1632a that is a bare wire. Can be.
  • the flat coil 1630a has a first depth d2 corresponding to 1/100 of the thickness of the coil wire, corresponding to a portion cut at the top of the coil wire when the thickness of the coil wire is 1.0 mm or less. Can be arranged.
  • the planar coil 1630b may include a first portion 1631b or a third portion 1633b to which a plating or EMI shield is applied, and may include a second portion 1632b that is a bare wire. Can be.
  • the thickness of the coil wire is a second thickness d3 of 4.0 mm or less
  • the planar coil 1630b corresponds to a portion cut at the top of the coil wire, and has a second depth d4 corresponding to 1/10 of the thickness of the coil wire. Can be arranged.
  • the planar coil 1630c may include a first portion 1631c or a third portion 1633c to which a plating or EMI shield is applied, and may include a second portion 1632c which is a bare wire.
  • the flat coil 1630c may have a depth d6 corresponding to a portion cut at the top of the coil wire, corresponding to one fifth of the thickness of the coil wire. Can be.
  • FIG. 19 is a diagram for describing a coil device, according to another embodiment.
  • the coil device 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.
  • 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.
  • a coil device 2100 may include a substrate 2130.
  • the substrate 2130 may be a flexible substrate and may be a rigid substrate.
  • the coil device 2100 may include a shielding material 2120.
  • the shielding material 2120 may be disposed on an upper surface of the substrate 2130.
  • the shielding material 2120 may guide the wireless power generated from the planar coil 1310 disposed above and toward the charging direction, and may protect various circuits disposed below from the electromagnetic field.
  • the shielding material 2120 may be integrated with the planar coil 2110 and disposed. More specifically, the shielding material 2120 may be disposed on the inner side, the outer side, and the bottom surface of the planar coil 2110.
  • the shielding material 2120 corresponds to the bottom surface of the substrate 2130 and the one-sided coil 211 and is the bottom portion 2123, which is the first layer, and the side portion 2122 corresponding to the outer portion of the planar coil 2110. And a second layer in which the center portion 2112 corresponding to the inner portion of the planar coil 2110 is disposed.
  • the planar coil 2110 may be disposed on the second layer of the shielding material 2120.
  • the height of the side 2122 of the shielding material 2120 may be equal to or greater than the height f2 of the planar coil 2110.
  • the width f4 of the side portion 2122 may be 0.1 mm or more.
  • the height of the center portion 2112 of the shielding material 2120 may be equal to or greater than the height f2 of the planar coil 2110.
  • the width f5 of the central portion 2112 may correspond to the inner length of the planar coil 2110.
  • the shielding material 2120 may fix the planar coil 2110.
  • the shielding material 2120 may protect the planar coil 2110 from external impact.
  • the coil device 2100 may include the planar coil 2110.
  • the planar coil 2110 may be an induction coil or a resonant coil.
  • the planar coil 2110 may include first and second coils, the first coil may be an induction coil, and the second coil may be a resonance coil.
  • the planar coil 2110 may be integrally disposed in the shielding material 2120.
  • planar coil 2110 of the coil device 2100 may have at least a spiral shape, a circle shape, an ellipse shape, a racetrack shape, a square shape, a triangular shape, or the like. It can be placed once by turning.
  • the planar coil 2110 may be disposed in a circular shape or a spiral shape. More specifically, the planar coil 2110 is disposed in the outer region and has a circular or spiral shape from one end 2111 where an AC signal is applied or outputted to the other end 2112 disposed in the inner region and an AC signal is output or applied. It may be extended by turning a plurality of times.
  • planar coil 2110 may contact the side portion 2122 of the shielding material 2120.
  • the other end 2112 of the planar coil 2110 may contact the central portion 2121 of the shielding material 2120.
  • planar coil 2110 is disposed 13 turns, but is not limited thereto.
  • planar coil 2110 of the coil device 2100 may be a bare copper wire.
  • the planar coil 2110 may be plated on one or both surfaces, or an EMI shield may be applied.
  • the coil wire of the planar coil 2110 may not be coated with an insulator coating.
  • Coils formed in a plane using a conventional etching process has a complicated manufacturing process and limited mass production.
  • the coil formed by using the etching process has a limit in increasing the separation distance between the coil line in the nature of the etching process.
  • the coil formed by using the etching process has a lot of portions where the upper part of the coil wire is etched due to the etching process characteristics, the raw material was wasted.
  • the coil formed by using the etching process has a problem that the area is narrowed because the portion of the upper portion of the coil wire is etched to increase the resistance.
  • the coil formed using the etching process has a problem that the portion to be etched is irregular and the resistance uniformity is inferior.
  • the planar coil 2110 of the coil device 2100 may be formed by a pressing process.
  • the planar coil 2110 may have a shape designed using a metal plate or a plate plated with a EMI shield or a plate (eg, a spiral shape, a circle shape, an ellipse shape, and a race) by using a press process or the like. Racetrack, square, triangular, etc.).
  • the planar coil 2110 may be disposed as a bare copper wire without a coating or a bare copper wire plated or with an EMI shield.
  • the coil coils 2110 may be disposed to be spaced apart from each other.
  • the planar coils 2110 may not be able to function as coils or may change inductance values, and thus may be spaced apart by the separation distance f1. More specifically, the separation distance f1 may be 0.1 mm or more and 2.5 mm or less. More specifically, the separation distance f1 may be 0.7 mm.
  • the planar coil 2110 may have a rectangular cross section of the coil wire.
  • the flat coil 2110 may be arranged on the upper surface of both sides of the coil wire which is a cut portion due to the pressing process.
  • the thickness f2 of the coil wire of the planar coil 2110 may be 0.01 mm or more and 2.5 mm or less.
  • the width f3 of the coil wire of the planar coil 2110 may be 0.5 mm or more and 2 mm or less.
  • the width f3 of the coil line of the planar coil 2110 may be 1.1 mm.
  • another embodiment can provide a low cost planar coil without using expensive coils coated with coil wires. Further, another embodiment may use a press process to provide a planar coil capable of mass production. Further, another embodiment may provide a planar coil having a thinner thickness than a coil formed by an etching process and having high uniformity of resistance value and low resistance value. In still another embodiment, the planar coil may be integrated with the shielding material to fix the planar coil without a separate configuration. In yet another embodiment, the planar coil can be protected from external impact by an integrated shield. In another embodiment, the planar coil may have heat resistance by the integrated shield.
  • FIG. 20 is a diagram for describing a planar coil, according to another exemplary embodiment.
  • the planar coil 1710 may be arranged to be turned at least once in a quadrangular shape.
  • the planar coil 1710 may be arranged in a square shape or a square spiral shape. More specifically, the planar coil 1710 has a square shape or a square spiral shape from one end 1711 disposed in the outer region and the other end 1711 disposed in the inner region and the AC signal is output or applied. It can be extended by turning a plurality of times.
  • the planar coil may be rotated a plurality of times by extending in a straight line from one end 1711 and turning one time so that the path is changed in the orthogonal direction to become a quadrangular shape and turning the inside twice a second time.
  • the planar coil 2110 is disposed 13 turns, but is not limited thereto.
  • 21 is a diagram for describing a coil device, according to another embodiment.
  • the first wire 1821 and the second wire 1822 may be electrically connected to the planar coil 1810 of FIGS. 13 to 20. More specifically, the first wire 1821 may be electrically connected to one end 1831 of the planar coil 1810 by the first connector 1831. The second wire 1822 may be electrically connected to the other end 1832 of the planar coil 1810 by the second connector 1832. The first connector 1831 and the second connector 1832 may be formed of solder or may be a connector. The first wire 1821 and the second wire 1822 may provide AC power or AC current by the power conversion unit 610 of the wireless power transmitter, and the AC power to the rectifier 720 of the wireless power receiver. Or alternating current.
  • the first wire 1821 and the second wire 1822 may be enamelled copper wires.
  • the thickness of the first electric wire 1821 and the second electric wire 1822 may be greater than the thickness of the planar coil 1810.
  • 22 is a diagram for describing a coil device, according to another embodiment.
  • a coil device may include a planar coil disposed in a plurality of layers. More specifically, the planar coil may include a first coil 1920 disposed on the first layer and a second coil 1910 disposed on the second layer.
  • the planar coil may include an insulating layer 1930.
  • the insulating layer 1930 may be flexible and rigid.
  • the insulating layer 1930 may be disposed between the first coil 1920 and the second coil 1910.
  • a hole 1931 may be disposed to connect the first coil 1920 and the second coil 1920.
  • the planar coil may include a first extension line 1921 or a second extension line 1911 to receive an AC signal or to provide an AC signal.
  • the first extension line 1921 may extend to be connected to the first coil 1920.
  • the second extension line 1911 may be extended to be connected to the second coil 1910.
  • the planar coil extends from the first extension line 1921 to be turned a plurality of times in the direction of the inner region of the insulating layer 1931 from the outer region of the insulating layer 1931, and the first coil 1920 is disposed.
  • the hole 1913 may be penetrated, and a plurality of turns may be extended from the inner region of the insulating layer 1930 toward the outer region of the insulating layer 1930 to the second extension line 1911.
  • the planar coil may be arranged in three or more layers instead of two layers.
  • a coil device including a planar coil disposed in a plurality of layers of FIG. 22 is thicker than a coil device including a single layer planar coil of FIG. 21. It can be thin. This is because in the coil device of FIG. 21, an enamelled copper wire thicker than one coil is disposed. Therefore, the coil device can be made thin in total thickness by planar coils arranged in a plurality of layers.
  • FIG. 23 is an exploded perspective view for explaining the coil device of FIG. 22.
  • the coil device of FIG. 22 may include a substrate 2060.
  • the substrate 2060 may be a flexible substrate or a rigid substrate.
  • the coil device may include a shield 2050.
  • the shield 2050 may be disposed on an upper surface of the substrate 2060.
  • the shielding material 2050 may guide the wireless power generated in the planar coils 2010, 2020, and 2030 disposed in the upper direction in the charging direction, and may protect various circuits disposed in the lower part from the electromagnetic field.
  • the coil device may fix the planar coils 2010, 2020, and 2030 to the shielding material 2050 by an adhesive 2040.
  • the planar coils 2010, 2020, and 2030 may be integrally fixed to the shielding material 2050.
  • the coil arrangement may also comprise planar coils arranged in a plurality of layers of FIG. 22. That is, the planar coil may include the first coil 2020 extending from the first extension line 2022, the insulating layer 2030 with the hole 2031 disposed therein, and the second coil 2010 extending from the second extension line 2011. It may include.
  • FIG. 24 is a diagram for describing a coil device, according to another embodiment.
  • a coil device may include a substrate 2250 and a shield 2240 disposed on the substrate 2250.
  • the coil device may include a plurality of coils.
  • the plurality of coils may include first planar coils 2211 to third planar coils 2213.
  • at least one of the plurality of coils may overlap each other in order to perform uniform power transmission or power reception in a charging region of a constant size.
  • the first planar coil 2211 and the second planar coil 2212 may be disposed on the shielding material 2240 in parallel with each other on the first layer, and the third planar coil 2213 may be disposed on the first layer.
  • the planar coil 2211 and the second planar coil 2212 may be disposed to overlap the second layer.
  • an insulating layer 2220 may be disposed between the third planar coil 2213 and the first planar coil 2211 or the third planar coil 2213 and the second planar coil 2212.
  • the coil device may include an adhesive 2240 to fix the plurality of coils to the shielding material 2240.
  • a plurality of coils and the shielding material 2240 may be integrally formed. In this case, the adhesive material 2240 may be removed from the coil device.
  • the embodiment may have a wider charging area by using a plurality of transmitting or receiving coils, thereby increasing user convenience.
  • FIG. 25 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.
  • each of the three coils included in the wireless power transmitter has different inductances
  • three coils including capacitors for generating the same resonant frequency as the three drive circuits 2510 connected to the respective coils are illustrated.
  • LC resonant circuit 2520 is required.
  • 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 2520 may vary according to the inductance of the coil and the capacitance of the capacitor.
  • 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 2510 including an inverter for applying an AC voltage in each LC resonant circuit 2520 are also required.
  • FIG. 26 illustrates a wireless power transmitter including a plurality of coils and a single drive circuit according to an embodiment.
  • the wireless power transmitter may include only one drive circuit 2610, and the wireless power receiver among one drive circuit 2610 and three coils.
  • the switch 2630 may be controlled to connect the coil of the wireless power transmitter with the coil having the highest power transmission efficiency.
  • the wireless power transmitter can reduce the area occupied by components by using only one drive circuit 2610, thereby miniaturizing the wireless power transmitter itself, and reducing raw material costs required for manufacturing. .
  • 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.
  • 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.
  • the wireless power transmitter may control the switch 2630 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 2610.
  • Q factor a factor
  • FIG. 27 is a diagram illustrating a drive circuit including a full-bridge inverter according to an embodiment.
  • a power transmitter included in the wireless power transmitter may generate a specific operating frequency for power transmission.
  • the power transmission unit may include an inverter 2710, an input power supply 2720, and an LC resonant circuit 2730.
  • the inverter 2710 may convert a voltage signal from an input power source and transmit the converted voltage signal to the LC resonant circuit 2730.
  • inverter 2710 may be a full-bridge inverter or may be a half-bridge inverter.
  • the power transmitter may use a full bridge inverter for higher output than the output by the half bridge inverter.
  • the full bridge inverter may be applied to the LC resonant circuit 1280 by outputting a voltage twice as high as that of the half bridge inverter using four switches in the form of adding two more switches to the half bridge inverter.
  • FIG. 28 is a diagram illustrating a plurality of switches connecting one of a plurality of coils of a wireless power transmitter to a drive circuit according to an exemplary embodiment.
  • the power transmitter includes a drive circuit 2810 for converting an input voltage, a switch 2820 for connecting the drive circuit 2810 and an LC resonant circuit, a plurality of transmission coils 2830, and a plurality of wireless power transmitters.
  • One capacitor 2840 connected in series with the coil of the control unit 2850 may include a control unit 2850 for controlling the opening and closing of the switch.
  • the controller 2850 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 2830 of the wireless power transmitter, and drives the coil of the identified wireless power transmitter in the drive circuit 2810. 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de bobine, un procédé de production du dispositif de bobine, et un émetteur et un récepteur de puissance sans fil comprenant le dispositif de bobine. Le dispositif de bobine selon un mode de réalisation de la présente invention comprend : un substrat; un matériau de blindage disposé sur le substrat; et une bobine plane formée à partir d'un fil de bobine allongé et enroulé plusieurs fois et disposée sur le matériau de blindage, la bobine plane pouvant avoir des parties du fil de bobine espacées l'une de l'autre.
PCT/KR2017/011097 2016-10-21 2017-10-02 Dispositif de bobine, procédé de production de dispositif de bobine, et émetteur et récepteur de puissance sans fil comprenant un dispositif de bobine WO2018074769A1 (fr)

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KR1020160137514A KR20180043993A (ko) 2016-10-21 2016-10-21 코일 장치와 코일 장치의 제조 방법 및 코일 장치를 포함하는 무선 전력 송수신 장치

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US11798728B2 (en) 2018-09-12 2023-10-24 DSBJ Pte. Ltd. Balanced, symmetrical coil
KR102167688B1 (ko) * 2019-03-21 2020-10-20 에스케이씨 주식회사 이동수단의 무선충전용 수신코일 및 이를 이용한 이동수단의 무선충전용 전력수신장치

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KR20130033857A (ko) * 2011-09-27 2013-04-04 삼성전기주식회사 적층형 공진 코일의 제조 방법
KR20140039528A (ko) * 2012-09-24 2014-04-02 엘지이노텍 주식회사 무선충전 기판 및 그 제조 방법
KR20140076994A (ko) * 2012-12-13 2014-06-23 엘지이노텍 주식회사 무선전력 수신장치 및 그의 제조 방법
JP2015117174A (ja) * 2013-12-20 2015-06-25 Tdk株式会社 フェライトプレート、アンテナ素子用部材、およびアンテナ素子
JP2016139784A (ja) * 2015-01-27 2016-08-04 サムソン エレクトロ−メカニックス カンパニーリミテッド． コイル部品

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KR20130033857A (ko) * 2011-09-27 2013-04-04 삼성전기주식회사 적층형 공진 코일의 제조 방법
KR20140039528A (ko) * 2012-09-24 2014-04-02 엘지이노텍 주식회사 무선충전 기판 및 그 제조 방법
KR20140076994A (ko) * 2012-12-13 2014-06-23 엘지이노텍 주식회사 무선전력 수신장치 및 그의 제조 방법
JP2015117174A (ja) * 2013-12-20 2015-06-25 Tdk株式会社 フェライトプレート、アンテナ素子用部材、およびアンテナ素子
JP2016139784A (ja) * 2015-01-27 2016-08-04 サムソン エレクトロ−メカニックス カンパニーリミテッド． コイル部品

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