KR20150047085A - Wireless power transfer apparatus and system - Google Patents

Abstract

Provided in the present invention is a wireless power transfer apparatus formed to wirelessly transfer power to a wireless power transfer apparatus, which comprises a body including a transfer coil changing magnetic flux through changes in current to transfer wireless power; and a repeater receiving the wireless power based on the conversion of magnetic flux, and arranged to face the transfer coil to transfer the received wireless power to the receiving apparatus.

Description

[0001] WIRELESS POWER TRANSFER APPARATUS AND SYSTEM [0002]

The present invention relates to a wireless power transmission device and a wireless charging system in the field of wireless power transmission.

[0002] Instead of a method of supplying electrical energy to a wireless power receiving apparatus by wire, a method of wirelessly supplying electric energy without contact has been used. A wireless power receiving apparatus that receives energy wirelessly may be driven directly by the received wireless power, or may be powered by the charged power by charging the battery using the received wireless power.

The Wireless Power Consortium, which deals with techniques for wireless power transmission of a self-induction type, is entitled " Wireless Power Transmission System Manual, Volume I, " on April 12, 2010 for interoperability in wireless power transmission, Low Power, Part 1: Interface Definition, Version 1.00 RC1 (System Description Wireless Power Transfer, Volume 1, Low Power, Part 1: Interface Definition, Version 1.00 Release Candidate 1)

Another technical standards body, the Power Matters Alliance, was founded in March 2012 to develop a family of interface standards and to release standard documents based on inductive coupling technology to provide inductive resonant power.

However, such a magnetic induction method has a problem that the distance between the coil and the receiving device which can be charged is limited. Therefore, a solution for solving such problems can be considered.

It is an object of the present invention to provide a mechanism for increasing charge distance in a wireless power transmission device and a wireless charging system.

It is another object of the present invention to provide a wireless power transmission device and a wireless charging system that are compatible with induction and resonance modes in wireless charging.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus, the wireless power transmission apparatus including a transmission coil for converting a magnetic flux through a current change to transmit wireless power And a relay coil having a relay coil arranged to receive the radio power based on the magnetic flux conversion and to face the transmission coil to transmit the received radio power to the receiving device.

In an embodiment, the repeater has a base station that provides power to the wireless power receiving device, and the relay coil may be disposed at a lower portion of the base station at a distance of up to 1.2 mm have.

In an embodiment, the first frequency band may be 120-140 kHz and the input voltage may be 12V +/- 5%.

In an embodiment, the transmission coil is wound so that a 15 Watt litz wire has a triangular shape. The outer coil of the transmission coil is 88.1 mm, the outer width is 63.1 mm, the inner height is 64.1 mm, and the inner width is 39.1 mm.

In an embodiment, the body is provided with a shield which overlaps the coil, and the thickness of the shield is at least 0.7 mm.

In an embodiment, the relay coil is wound so that the 18 Watt litz wire has a circular shape. The outer diameter of the relay coil may be 71.5 mm and the inner diameter may be 25.3 mm. The relay coil may have a thickness of 1.3 0.3 mm.

In one embodiment, the transmission coil transmits radio power in a first frequency band, and the relay coil converts radio power in the received first frequency band into radio power in a second frequency band for transmission.

In an embodiment, the first frequency band may be lower than the second frequency band. The transmission coil is configured to generate a magnetic field that transmits inductive power, and the relay coil may be configured to generate a magnetic field that oscillates at a resonant frequency using power derived from the magnetic field.

The relay coil may include a first relay coil for receiving the radio power of the first frequency band, a conversion circuit for converting the frequency of the radio power received by the first relay coil to the second frequency band, And a second relay coil connected to the conversion circuit for transmitting the radio power of the second frequency band.

The first relay coil and the second relay coil may be arranged to face each other. The repeater may include a shielding member disposed between the first relay coil and the second relay coil.

In an embodiment, the transmission coil may include a first coil formed to generate a magnetic field to transmit inductive mode power, and a second coil wound around the first coil, And a second coil configured to generate a magnetic field.

Wherein the control unit of the wireless power transmission apparatus applies electric power to the first and second coils separately and controls the power of the wireless power transmission apparatus by using either the inductive mode or the resonant mode, To be transmitted.

The body further includes a circuit portion electrically connected to the transmission coil, and the circuit portion may shift the first frequency band by changing the electrical connection of the plurality of capacitors. The circuit unit may be configured to vary the number of capacitors included in the resonant circuit that transmits the radio power among the plurality of capacitors.

The present invention also relates to a wireless communication system including a transmitting apparatus formed to transmit wireless power and a receiving apparatus configured to receive wireless power from the transmitting apparatus, And a relay coil disposed to receive the radio power based on the magnetic flux conversion and arranged to face the transmission coil to transfer the received radio power to the reception device, / RTI >

The present invention can solve the disadvantage that, when the magnetic induction method is used through the repeater, the transmission device and the receiving device are located at a limited position, charging is performed. In addition, through this, not only the degree of freedom is increased on the charging surface, but also the charging distance between the transmitting device and the receiving device can be increased.

Further, the present invention combines induction type coils and resonance type coils with repeaters to realize induction / resonance compatible coils. INDUSTRIAL APPLICABILITY The induction / resonance compatible coil of the present invention can provide a transient technology for generating a resonance method for an induction system that has already been commercialized.

FIG. 1 is an exemplary view conceptually showing a wireless power transmission apparatus and a wireless power reception apparatus according to embodiments of the present invention.
2A and 2B are block diagrams illustrating exemplary configurations of a wireless power transmission device and a wireless power reception device that can be employed in the embodiments disclosed herein.
3 illustrates a concept that power is transmitted from a wireless power transmission apparatus to a wireless power receiving apparatus wirelessly according to an inductive coupling scheme.
4 is a block diagram exemplarily showing a part of the configuration of a wireless power transmission apparatus and a wireless power reception apparatus of a magnetic induction type that can be employed in the embodiments disclosed herein.
5 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with an inductive coupling scheme employable in the embodiments disclosed herein.
FIG. 6 illustrates a concept that power is transmitted from a wireless power transmission apparatus to a wireless power reception apparatus wirelessly according to a resonant coupling scheme.
7 is a block diagram exemplarily showing a part of a configuration of a wireless power transmission apparatus and a wireless power reception apparatus of a resonance type usable in the embodiments disclosed herein.
8 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with a resonant coupling scheme employable in the embodiments disclosed herein.
9 illustrates a concept of transmitting and receiving packets between a wireless power transmission device and an electronic device through modulation and demodulation of a wireless power signal in wireless power transmission according to the embodiments disclosed herein.
10 illustrates a configuration for transmitting and receiving a power control message in a wireless power transmission according to the embodiments disclosed herein.
FIG. 11 illustrates the form of signals in modulation and demodulation performed in a wireless power transmission in accordance with the embodiments disclosed herein.
12 illustrates a packet including a power control message used in a wireless power transfer method in accordance with the embodiments disclosed herein.
13 illustrates operating states of a wireless power transmission apparatus and a wireless power receiving apparatus according to embodiments disclosed herein.
14 to 18 show the structure of packets including the power control message between the wireless power transmission apparatus 100 and the wireless power receiving apparatus.
19 is a conceptual diagram showing a method by which a wireless power transmission apparatus transmits electric power to one or more wireless power reception apparatuses.
20 is a perspective view showing a transmission apparatus having a repeater.
Figs. 21, 22, and 23 are plan views of the transmission coil, the relay coil, and the reception coil shown in Fig. 20, respectively.
24 and 25 are a conceptual diagram and a block diagram of a charging method that is compatible with the induction method and the resonance method.
Fig. 26 is a configuration diagram of the relay device of Fig. 20; Fig.
27A and 27B are a plan view and a front view of a transmission coil which is compatible with the induction type and the resonance type.
FIG. 28 is a conceptual diagram showing an example of a method of driving the transmission coil of FIG. 27A. FIG.
Fig. 29 is a block diagram of a circuit connected to the transmission coil of Fig. 27A. Fig.

The techniques disclosed herein apply to wireless power transmission. However, the technology disclosed in this specification is not limited thereto, and can be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and apparatus that utilize wirelessly transmitted power to which the technical idea of the technology can be applied .

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Furthermore, suffixes "module" and " part "for components used in the present specification are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Justice

Many-to-one communication method: how one transmitter (Tx) communicates with multiple receivers (Rx)

Unidirectional communication: a communication method in which a receiver only sends a necessary message to the transmitter side

Bidirectional communication: A transmitter is a receiver and a receiver is a transmitter, that is, a communication method capable of transmitting messages on both sides

Here, the transmitter and the receiver are the same as the transmitter and the receiver, respectively, and these terms can be used in combination.

Wireless power transmission device and wireless power receiving device conceptual diagram

FIG. 1 is an exemplary view conceptually showing a wireless power transmission apparatus and a wireless power reception apparatus according to embodiments of the present invention.

1, the wireless power transmission apparatus 100 may be a power transmission apparatus that transmits power wirelessly required by the wireless power receiving apparatus 200. [

The wireless power transmission apparatus 100 may be a wireless charging apparatus that charges the battery of the wireless power receiving apparatus 200 by transmitting power wirelessly.

In addition, the wireless power transmission apparatus 100 may be implemented as various types of devices that transmit power to the wireless power receiving apparatus 200 that requires power in a non-contact state.

The wireless power receiving apparatus 200 is a device capable of receiving power wirelessly from the wireless power transmission apparatus 100 and operating. Also, the wireless power receiving apparatus 200 can charge the battery using the received wireless power.

Meanwhile, the wireless power receiving apparatus that receives power wirelessly as described in the present specification may be any portable electronic apparatus such as a keyboard, a mouse, an auxiliary output device such as a video or audio auxiliary output device, a cellular phone, a cellular phone, A smart phone, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a tablet, or a multimedia device.

The wireless power receiving apparatus 200 may be a mobile communication terminal (e.g., a cellular phone, a cellular phone, a tablet) or a multimedia device, as described later.

Meanwhile, the wireless power transmission apparatus 100 may transmit power wirelessly to the wireless power receiving apparatus 200 without mutual contact using one or more wireless power transmission methods. That is, the wireless power transmission apparatus 100 uses an inductive coupling scheme based on a magnetic induction phenomenon by the wireless power signal, and a magnetic resonance coupling based on an electromagnetic resonance phenomenon by a wireless power signal of a specific frequency ) ≪ / RTI >

The inductive coupling type wireless power transmission is a technique of wirelessly transmitting power by using a primary coil and a secondary coil, and a current is induced to the other coil through a magnetic field changing in one coil due to the magnetic induction phenomenon, .

In the wireless power transmission by the resonance coupling method, resonance occurs in the wireless power receiving apparatus 200 due to a wireless power signal transmitted from the wireless power transmission apparatus 100, (100) to the wireless power receiving apparatus (200).

Hereinafter, embodiments of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 disclosed in the present specification will be described in detail. In the drawings, the same reference numerals as possible are used to denote the same or similar components, even if they are shown in different drawings.

2A and 2B are block diagrams illustrating a configuration of a wireless power transmission apparatus 100 and a wireless power receiving apparatus 200 that can be employed in the embodiments disclosed herein.

Wireless power transmission device

Referring to FIG. 2A, the wireless power transmission apparatus 100 is configured to include a power transmission unit 110. FIG. The power transmission unit 110 may include a power conversion unit 111 and a power transmission control unit 112.

The power conversion unit 111 converts the power supplied from the transmission power supply unit 190 into a wireless power signal and transmits the wireless power signal to the wireless power reception apparatus 200. The radio power signal transmitted by the power converter 111 is formed in the form of a magnetic field or an electro-magnetic field having oscillation characteristics. For this, the power conversion unit 111 may be configured to include a coil for generating the wireless power signal.

The power conversion unit 111 may include components for forming different types of wireless power signals according to each power transmission scheme. For example, the power conversion unit 111 may be configured to include a primary coil that forms a changing magnetic field in order to induce a current in the secondary coil of the wireless power receiving apparatus 200 according to an inductive coupling scheme have. The power conversion unit 111 may be configured to include a coil (or antenna) that forms a magnetic field having a specific resonance frequency in order to generate a resonance phenomenon in the wireless power receiving apparatus 200 according to a resonance coupling scheme have.

The power conversion unit 111 may transmit power using one or more of the inductive coupling method and the resonant coupling method described above.

Among the components included in the power conversion unit 111, those following the inductive coupling scheme will be described with reference to FIGS. 4 and 5, and those according to the resonant coupling scheme will be described later with reference to FIG. 7 and FIG.

The power conversion unit 111 may further include a circuit for adjusting characteristics of a frequency, an applied voltage, and a current used for forming the wireless power signal.

The power transmission control unit 112 controls each component included in the power transmission unit 110. The power transmission control unit 112 may be integrated with another control unit (not shown) that controls the wireless power supply apparatus 100.

Meanwhile, an area where the wireless power signal can reach can be divided into two types. First, an active area refers to a region through which a wireless power signal that transmits power to the wireless power receiving apparatus 200 passes. Next, a semi-active area refers to an area of interest in which the wireless power transmission apparatus 100 can detect the presence of the wireless power receiving apparatus 200. [ Here, the power transmission control unit 112 may detect whether the wireless power receiving apparatus 200 is placed in or removed from the active region or the sensing region. Specifically, the power transmission control unit 112 uses the wireless power signal generated by the power conversion unit 111 or the wireless power reception apparatus 200 is connected to the active area or the sensing area by a separately provided sensor It can be detected whether or not it has been deployed. For example, the power transmission control unit 112 receives the wireless power signal due to the wireless power receiving apparatus 200 existing in the sensing area, and forms the wireless power signal of the power conversion unit 111 The presence of the wireless power receiving apparatus 200 can be detected by monitoring whether or not the characteristic of the power for the wireless power receiving apparatus 200 changes. However, the active area and the sensing area may differ depending on a wireless power transmission scheme such as an inductive coupling scheme and a resonant coupling scheme.

The power transmission control unit 112 may perform the process of identifying the wireless power receiving apparatus 200 according to a result of detecting the presence of the wireless power receiving apparatus 200 or may determine whether to start wireless power transmission have.

The power transmission control unit 112 may determine at least one of a frequency, a voltage, and a current of the power conversion unit 111 for forming the wireless power signal. The determination of the characteristics may be made according to conditions on the side of the wireless power transmission apparatus 100 or on conditions on the side of the wireless power reception apparatus 200. [

The power transmission control unit 112 may receive a power control message from the wireless power receiving apparatus 200. [ The power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and current of the power conversion unit 111 based on the received power control message, Operation can be performed.

For example, the power transmission control unit 112 may form the wireless power signal according to a power control message including at least one of the rectified power amount information, the charging status information and the identification information of the wireless power receiving apparatus 200 It is possible to determine at least one of the characteristics of the frequency, current, and voltage to be used.

In addition, as another control operation using the power control message, the wireless power transmission apparatus 100 may perform a general control operation related to wireless power transmission based on the power control message. For example, the wireless power transmission apparatus 100 receives information to be output audibly or visually related to the wireless power receiving apparatus 200 through the power control message, or receives information necessary for authentication between devices It is possible.

In order to receive the power control message, the power transmission control unit 112 may use at least one of a method of receiving through the wireless power signal and a method of receiving other user data.

In order to receive the power control message, the wireless power transmission apparatus 100 may further include a power communication modulation / demodulation unit 113 electrically connected to the power conversion unit 111 . The modem unit 113 may be used to demodulate the wireless power signal modulated by the wireless power receiving apparatus 200 and receive the power control message.

In addition, in some embodiments, the power transmission control unit 112 receives user data including a power control message by communication means (not shown) included in the wireless power transmission apparatus 100, .

[When supporting in-band two-way communication]

In addition, in the wireless power transmission environment capable of bidirectional communication according to the embodiments disclosed herein, the power transmission control unit 112 may transmit data to the wireless power receiving apparatus 200. [ The data transmitted by the power transmission control unit 112 may be a request for the wireless power receiving apparatus 200 to send a power control message.

Wireless power receiving device

Referring to FIG. 2B, the wireless power receiving apparatus 200 is configured to include a power supply unit 290. The power supply unit 290 supplies power required for operation of the wireless power receiving apparatus 200. The power supply unit 290 may include a power receiving unit 291 and a power receiving control unit 292.

The power receiving unit 291 receives power transmitted from the wireless power transmission apparatus 100 wirelessly.

The power receiving unit 291 may include components necessary for receiving the wireless power signal according to a wireless power transmission scheme. In addition, the power receiver 291 may receive power according to one or more wireless power transmission schemes. In this case, the power receiver 291 may include necessary components according to each scheme.

First, the power receiving unit 291 may be configured to include a coil for receiving a radio power signal transmitted in the form of a magnetic field or an electromagnetic field having an oscillating characteristic.

For example, as a component according to an inductive coupling scheme, the power receiving unit 291 may include a secondary coil whose current is induced by a changing magnetic field. The power receiving unit 291 may include a coil and a resonant circuit that generate a resonance phenomenon by a magnetic field having a specific resonance frequency as a component according to a resonant coupling scheme.

However, when the power receiving unit 291 receives power according to one or more wireless power transmission schemes, the power receiving unit 291 may be configured to receive using one coil, And may be implemented to receive using a coil.

Among the components included in the power receiving unit 291, those following the inductive coupling scheme will be described with reference to FIG. 4, and those according to the resonant coupling scheme will be described later with reference to FIG.

Meanwhile, the power receiving unit 291 may further include a rectifier and a regulator for converting the radio power signal into a direct current. The power receiving unit 291 may further include a circuit for preventing an overvoltage or an overcurrent from occurring due to the received power signal.

The power reception control unit 292 controls the components included in the power supply unit 290.

Specifically, the power receiving control unit 292 may transmit a power control message to the wireless power transmission apparatus 100. FIG. The power control message may instruct the wireless power transmission apparatus 100 to start or terminate the transmission of the wireless power signal. The power control message may also direct the wireless power transmission apparatus 100 to adjust the characteristics of the wireless power signal.

In order to transmit the power control message, the power control unit 292 may use at least one of a method of transmitting through the wireless power signal and a method of transmitting through the other user data.

In order to transmit the power control message, the wireless power receiving apparatus 200 may further include a power communication modulation / demodulation unit 293 electrically connected to the power receiving unit 291. The modem unit 293 can be used to transmit the power control message through the wireless power signal, as in the case of the wireless power transmission apparatus 100 described above. The modem unit 293 may be used as a means for adjusting the current and / or voltage flowing through the power conversion unit 111 of the wireless power transmission apparatus 100. Hereinafter, a description will be given of a method in which the modulation and demodulation units 113 and 293 of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 are used for transmission and reception of a power control message through a wireless power signal, respectively do.

The wireless power signal formed by the power conversion unit 111 is received by the power receiving unit 291. At this time, the power reception control unit 292 controls the modem unit 293 of the wireless power receiving apparatus 200 to modulate the wireless power signal. For example, the power reception control unit 292 may modify the reactance of the modem unit 293 connected to the power reception unit 291 so that the amount of power received from the wireless power signal changes accordingly have. A change in the amount of power received from the wireless power signal results in a change in the current and / or voltage of the power conversion unit 111 forming the wireless power signal. At this time, the modulation / demodulation unit 113 of the wireless power transmission apparatus 100 detects a change in the current and / or voltage of the power conversion unit 111 and performs a demodulation process.

That is, the power reception controller 292 generates a packet including a power control message to be transmitted to the wireless power transmission apparatus 100, modulates the wireless power signal to include the packet, The transmission control unit 112 can obtain the power control message included in the packet by decoding the packet based on the demodulation process result of the modulation / demodulation unit 113.

In addition, in some embodiments, the power reception control unit 292 transmits user data including a power control message by communication means (not shown) included in the wireless power reception apparatus 200, To the wireless power transmission apparatus 100. The wireless power transmission apparatus 100 shown in FIG.

[When supporting in-band two-way communication]

In addition, in the wireless power transmission environment capable of bidirectional communication according to the embodiments disclosed herein, the power reception control unit 292 can receive data transmitted from the wireless power transmission apparatus 100. [ The data transmitted from the wireless power transmission apparatus 100 may be to request to transmit a power control message.

In addition, the power supply unit 290 may be configured to further include a charging unit 298 and a battery 299.

The wireless power receiving apparatus 200 receiving power for operation from the power supply unit 290 operates by the power transmitted from the wireless power transmission apparatus 100 or by using the transmitted power, The battery 299 can be operated by the electric power charged in the battery 299 after the battery 299 is charged. At this time, the power receiving control unit 292 may control the charging unit 298 to perform charging using the transmitted power.

Hereinafter, a wireless power transmission apparatus and a wireless power receiving apparatus applicable to the embodiments disclosed herein will be described. 3 to 5, a method of transmitting power by the wireless power transmission apparatus to the wireless power reception apparatus according to an inductive coupling scheme is disclosed.

Inductively coupled

3 illustrates a concept that power is transmitted from a wireless power transmission apparatus to a wireless power receiving apparatus wirelessly according to an inductive coupling scheme.

When the power transmission of the wireless power transmission apparatus 100 follows the inductive coupling scheme, when the intensity of the current flowing through the primary coil in the power transmission unit 110 is changed, the primary coil The passing magnetic field changes. The thus changed magnetic field generates an induced electromotive force on the secondary coil side of the wireless power receiving apparatus 200.

According to this scheme, the power conversion section 111 of the wireless power transmission apparatus 100 is configured to include a transmission coil (Tx coil) 1111a that operates as a primary coil in magnetic induction. The power receiving unit 291 of the wireless power receiving apparatus 200 is configured to include a receiving coil (Rx coil) 2911a that operates as a secondary coil in magnetic induction.

The wireless power transmission apparatus 100 and the wireless power receiving apparatus 200 are arranged such that the transmission coil 1111a on the wireless power transmission apparatus 100 side and the reception coils on the wireless power reception apparatus 200 side are close to each other, . Thereafter, when the power transmission control unit 112 controls the current of the transmission coil 1111a to be changed, the power receiving unit 291 receives the power from the wireless power receiving apparatus 200 to be supplied with power.

The efficiency of the wireless power transmission by the inductively coupled system is less influenced by the frequency characteristics but is influenced by the alignment between the wireless power transmission apparatus 100 including the coils and the wireless power reception apparatus 200, And distance (distance).

Meanwhile, the wireless power transmission apparatus 100 may be configured to include an interface surface (not shown) in the form of a flat surface for wireless power transmission by the inductive coupling method. One or more wireless power receiving devices may be disposed on the interface surface, and the transmission coil 1111a may be mounted on a lower surface of the interface. In this case, the vertical spacing between the transmission coil 1111a mounted on the lower surface of the interface and the reception coil 2911a of the wireless power receiving apparatus 200 located above the interface surface is made small The distance between the coils is sufficiently small so that wireless power transmission by the inductive coupling method can be efficiently performed.

In addition, an arrangement indicator (not shown) may be formed on the interface surface to indicate a position where the wireless power receiving apparatus 200 is to be placed. The arrangement indicator indicates the position of the wireless power receiving apparatus 200 in which the arrangement between the transmission coil 1111a mounted on the lower surface of the interface and the reception coil 2911a can be suitably adjusted. The arrangement indicator may be a simple mark or may be formed in the form of a protruding structure for guiding the position of the wireless power receiving apparatus 200. Or the array directing part is formed in the form of a magnetic body such as a magnet mounted on the lower surface of the interface so that the coils are arranged in an appropriate array by mutual attracting force with other magnetic bodies mounted inside the wireless power receiving apparatus 200 As shown in FIG.

Meanwhile, the wireless power transmission apparatus 100 may be formed to include one or more transmission coils. The wireless power transmission apparatus 100 may selectively increase the power transmission efficiency by selectively using a part of the coils suitably arranged with the reception coil 2911a of the wireless power reception apparatus 200 among the one or more transmission coils. The wireless power transmission apparatus 100 including the one or more transmission coils will be described below with reference to Fig.

Hereinafter, a configuration of an inductively coupled wireless power transmission apparatus and a wireless power reception apparatus applicable to the embodiments disclosed herein will be described in detail.

Inductively coupled wireless power transmission apparatus and wireless power receiving apparatus

4 is a block diagram exemplarily showing a part of the configuration of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 of the magnetic induction type that can be employed in the embodiments disclosed herein. 4A, the configuration of the power transfer unit 110 included in the wireless power transmission apparatus 100 will be described. Referring to FIG. 4B, the configuration of the power supply unit 110 included in the wireless power reception apparatus 200 will be described. 290 will be described.

Referring to FIG. 4A, the power conversion unit 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111a and an inverter 1112. FIG.

As described above, the transmission coil 1111a forms a magnetic field corresponding to a radio power signal in accordance with a change in current. The transmission coil 1111a may be implemented as a planar spiral type or a cylindrical solenoid type.

The inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform. An alternating current deformed by the inverter 1112 is formed in the transmission coil 1111a by driving a resonant circuit including the transmission coil 1111a and a capacitor (not shown) .

In addition, the power conversion unit 111 may be further configured to include a positioning unit 1114.

The positioning unit 1114 may move or rotate the transmission coil 1111a to increase the efficiency of the wireless power transmission by the inductive coupling scheme. This is because, as described above, the power transmission by the inductively coupled mode is performed by adjusting the alignment and distance between the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 including the primary and secondary coils distance). Particularly, the positioning unit 1114 can be used when the wireless power receiving apparatus 200 is not in the active area of the wireless power transmission apparatus 100.

The position determining unit 1114 determines that the distance between the center of the transmission coil 1111a of the wireless power transmission apparatus 100 and the center of the reception coil 2911a of the wireless power reception apparatus 200 is (Not shown) that moves the transmission coil 1111a so as to be within a certain range or rotates the transmission coil 1111a so that the center of the transmission coil 1111a and the reception coil 2911a overlap with each other .

To this end, the wireless power transmission apparatus 100 may further include a position detection unit (not shown) configured to detect a position of the wireless power reception apparatus 200, The controller 112 may control the positioning unit 1114 based on the position information of the wireless power receiving apparatus 200 received from the position sensing sensor.

For this, the power transmission control unit 112 receives control information on the arrangement or distance with the wireless power receiving apparatus 200 through the modulation / demodulation unit 113, and transmits control information on the received arrangement or distance The position determining unit 1114 can be controlled based on the position information.

If the power conversion unit 111 is configured to include a plurality of transmission coils, the positioning unit 1114 can determine which of the plurality of transmission coils is to be used for power transmission. The configuration of the wireless power transmission apparatus 100 including the plurality of transmission coils will be described later with reference to Fig.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 on the side of the wireless power transmission apparatus 100 monitors the current or voltage flowing in the transmission coil 1111a. The power sensing unit 1115 detects a voltage or current of a power source supplied from outside and determines whether the detected voltage or current exceeds a threshold value Can be confirmed. The power sensing unit 1115 compares a voltage or current value of the detected power source with a threshold value and outputs a result of the comparison. And a comparator. Based on the result of the detection by the power sensing unit 1115, the power transmission control unit 112 may control the switching unit (not shown) to cut off the power applied to the transmission coil 1111a.

Referring to FIG. 4B, the power supply unit 290 of the wireless power receiving apparatus 200 may be configured to include a receiving coil (Rx coil) 2911a and a rectifying circuit 2913.

A current is induced in the reception coil 2911a by a change in the magnetic field formed from the transmission coil 1111a. The receiving coil 2911a may be in the form of a flat spiral or cylindrical solenoid, as in the case of the transmitting coil 1111a.

In addition, series and parallel capacitors may be connected to the receiving coil 2911a to enhance reception efficiency of the wireless power or to detect resonance.

The receiving coil 2911a may be in the form of a single coil or a plurality of coils.

The rectifying circuit 2913 performs full-wave rectification on the current to convert the alternating current into direct current. The rectifier circuit 2913 may be implemented by, for example, a full bridge rectifier circuit including four diodes or a circuit using active components.

In addition, the rectifying circuit 2913 may further include a regulator for converting the rectified current into a more flat and stable direct current. The output power of the rectifying circuit 2913 is supplied to the respective components of the power supply unit 290. The rectifying circuit 2913 is a DC-DC converter that converts the output DC power to an appropriate voltage to match the power required for each component of the power supply unit 290 (for example, a circuit similar to the charging unit 298) (DC-DC converter).

The modulation and demodulation unit 293 may be constituted by a resistive element connected to the power receiving unit 291 and having a resistance varying with respect to a direct current and a capacitive element whose reactance is changed with respect to an alternating current . The power receiving control unit 292 may modulate the wireless power signal received by the power receiving unit 291 by changing the resistance or reactance of the modem unit 293.

The power supply unit 290 may further include a power sensing unit 2914. The power sensing unit 2914 of the wireless power receiving apparatus 200 monitors the voltage and / or the current of the power source rectified by the rectifying circuit 2913 and monitors the voltage and / or current of the rectified power source When the current exceeds the threshold value, the power receiving control unit 292 transmits a power control message to the wireless power transmission apparatus 100 to transmit appropriate power.

A wireless power transmission apparatus configured with one or more transmission coils

5 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with an inductive coupling scheme employable in the embodiments disclosed herein.

Referring to FIG. 5, the power conversion section 111 of the wireless power transmission apparatus 100 according to the embodiments disclosed herein may be configured with one or more transmission coils 1111a-1 to 1111a-n. The one or more transmission coils 1111a-1 to 1111a-n may be an array of partly overlapping primary coils. An active area may be determined by a portion of the one or more transmission coils.

The one or more transmission coils 1111a-1 to 1111a-n may be mounted below the interface surface. The power conversion unit 111 may further include a multiplexer 1113 for establishing and releasing connection of some of the one or more transmission coils 1111a-1 to 1111a-n .

When the position of the wireless power receiving apparatus 200 located on the interface surface is sensed, the power transmission control unit 112 controls the transmission power of the one or more transmission coils 1111a-1 to 1111a-n of the wireless power receiving apparatus 200 can be connected to the receiving coils 2911a of the wireless power receiving apparatus 200. [

For this, the power transmission control unit 112 may acquire the location information of the wireless power receiving apparatus 200. For example, the power transmission control unit 112 acquires the position of the wireless power receiving apparatus 200 on the interface surface by the position sensing unit (not shown) provided in the wireless power transmission apparatus 100 . As another example, the power transmission control unit 112 may use the one or more transmission coils 1111a-1 to 1111a-n to generate a power control message indicating the strength of the wireless power signal from an object on the interface surface, Acquiring position information of the wireless power receiving apparatus 200 by receiving a power control message indicating identification information of the object and determining which coil of the one or more transmission coils is close to the position based on the received result, You may.

On the other hand, the active area is a part of the interface surface, which means that the high efficiency magnetic field can pass when the wireless power transmission apparatus 100 transmits power wirelessly to the wireless power receiving apparatus 200 . At this time, a single transmission coil or a combination of one or more transmission coils for forming a magnetic field passing through the active region may be referred to as a primary cell. Therefore, the power transmission control unit 112 determines an activity area based on the sensed position of the wireless power receiving apparatus 200, establishes connection of major cells corresponding to the active area, 200 and the coils belonging to the main cell can be placed in the inductive coupling relationship with each other.

The power conversion unit 111 may further include an impedance matching unit (not shown) for adjusting the impedance to form a resonant circuit with the coils connected thereto.

Hereinafter, a method of transmitting power according to a resonant coupling scheme by a wireless power transmission apparatus is described with reference to FIGS.

Resonance coupling method

FIG. 6 illustrates a concept that power is transmitted from a wireless power transmission apparatus to a wireless power reception apparatus wirelessly according to a resonant coupling scheme.

First, the resonance (or resonance) will be briefly described as follows. Resonance refers to a phenomenon in which the vibration system receives an external force periodically having the same frequency as its natural frequency, and the amplitude thereof increases sharply. Resonance is a phenomenon occurring in all vibrations, such as mechanical vibration and electrical vibration. Generally, when a force capable of vibrating the vibration system is applied from the outside, if the natural frequency of the vibration system is equal to the frequency of the external force, the vibration becomes larger and the amplitude becomes larger.

In the same principle, when a plurality of vibrating bodies separated within a certain distance oscillate at the same frequency, the plurality of vibrating bodies resonate with each other, and in this case, the resistance between the vibrating bodies decreases. In an electric circuit, an inductor and a capacitor can be used to make a resonant circuit.

When the power transmission of the wireless power transmission apparatus 100 follows the resonant coupling scheme, a magnetic field having a specific vibration frequency is formed by the AC power source in the power transmission unit 110. When a resonance phenomenon occurs in the wireless power receiving apparatus 200 due to the magnetic field, power is generated in the wireless power receiving apparatus 200 by the resonance phenomenon.

The resonance frequency can be determined by, for example, the following equation (1).

Here, the resonance frequency f is determined by the inductance L and the capacitance C in the circuit. In a circuit for forming a magnetic field using a coil, the inductance is determined by the number of revolutions of the coil and the like, and the capacitance can be determined by an interval, an area, or the like between the coils. A capacitive resonance circuit may be connected to the coil to determine the resonance frequency.

Referring to FIG. 6, when power is transmitted wirelessly according to a resonant coupling scheme, the power conversion unit 111 of the wireless power transmission apparatus 100 includes a transmission coil (Tx coil) 1111b and a transmission coil And a resonance circuit 1116 connected to the transmission coil 1111b and for determining a specific oscillation frequency. The resonant circuit 1116 can be implemented using capacitors and the specific oscillation frequency is determined based on the inductance of the transmission coil 1111b and the capacitance of the resonant circuit 1116. [

The configuration of the circuit elements of the resonant circuit 1116 may be variously configured to form a magnetic field by the power conversion unit 111 and may be connected in parallel with the transmission coil 1111b as shown in FIG. It is not limited.

The power receiving unit 291 of the wireless power receiving apparatus 200 further includes a resonant circuit 2912 and a receiving coil Rx coil configured to cause a resonance phenomenon by a magnetic field formed in the wireless power transmission apparatus 100, Gt; 2911b. ≪ / RTI > That is, the resonance circuit 2912 may be implemented using a capacitive circuit, and the resonance circuit 2912 is determined based on the inductance of the reception coil 2911b and the capacitance of the resonance circuit 2912 And the resonance frequency is equal to the resonance frequency of the magnetic field formed.

 The configuration of the circuit elements of the resonant circuit 2912 may be variously configured to allow the power receiving unit 291 to resonate by the magnetic field and may be connected in series with the receiving coil 2911b as shown in FIG. But is not limited to.

The specific vibration frequency in the wireless power transmission apparatus 100 may be obtained using Equation 1 with LTx, CTx. Here, resonance occurs in the wireless power receiving apparatus 200 when the result of substituting the LRX and CRX of the wireless power receiving apparatus 200 into Equation 1 is equal to the specific vibration frequency.

According to the wireless power transmission scheme using the resonance coupling, when the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 resonate at the same frequency, the electromagnetic waves are transmitted through the near field electromagnetic field, There is no energy transfer between devices.

Therefore, the efficiency of the wireless power transmission by the resonance coupling method is largely affected by the frequency characteristics, while the arrangement between the wireless power transmission apparatus 100 including the coils and the wireless power reception apparatus 200, The effect of distance is relatively small compared to inductive coupling.

Hereinafter, a configuration of a wireless power transmission apparatus and a wireless power reception apparatus of a resonance coupling type applicable to the embodiments disclosed herein will be described in detail.

Resonant coupling type wireless power transmission device

7 is a block diagram exemplarily showing a part of the configuration of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 of the resonance type that can be employed in the embodiments disclosed herein.

The configuration of the power transmission unit 110 included in the wireless power transmission apparatus 100 will be described with reference to FIG. 7A.

The power conversion unit 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111b, an inverter 1112, and a resonant circuit 1116. [ The inverter 1112 may be configured to be connected to the transmission coil 1111b and the resonant circuit 1116.

The transmission coil 1111b may be mounted separately from the transmission coil 1111a for transmitting electric power according to the inductive coupling scheme, but it may also transmit power using an inductive coupling scheme or a resonant coupling scheme using one single coil.

The transmission coil 1111b forms a magnetic field for transmitting electric power, as described above. The transmission coil 1111b and the resonant circuit 1116 may be vibrated when the AC power is applied and at this time the oscillation frequency is set to a value based on the inductance of the transmission coil 1111b and the capacitance of the resonant circuit 1116 Can be determined.

To this end, the inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform, and the transformed AC current is applied to the transmission coil 1111b and the resonance circuit 1116.

In addition, the power conversion unit 111 may further include a frequency adjustment unit 1117 for changing the resonance frequency value of the power conversion unit 111. Since the resonance frequency of the power conversion unit 111 is determined based on the inductance and the capacitance in the circuit constituting the power conversion unit 111 according to Equation 1, the power transmission control unit 112 controls the inductance and / The resonance frequency of the power converter 111 can be determined by controlling the frequency adjuster 1117 so that the capacitance is changed.

The frequency adjuster 1117 may include a motor capable of changing the capacitance by adjusting the distance between the capacitors included in the resonant circuit 1116 or may include a motor for changing the number of rotations of the transmission coil 1111b number of turns, or a motor capable of changing the inductance by adjusting the diameter, or it may be configured to include active elements that determine the capacitance and / or inductance.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The operation of the power sensing unit 1115 is the same as described above.

The configuration of the power supply unit 290 included in the wireless power receiving apparatus 200 will be described with reference to FIG. 7B. The power supply 290 may be configured to include the receive coil (Rx coil) 2911b and the resonant circuit 2912, as described above.

In addition, the power receiving unit 291 of the power supply unit 290 may be configured to further include a rectifying circuit 2913 that converts the alternating current generated by the resonance phenomenon to direct current. The rectifying circuit 2913 may be constructed in the same manner as described above.

The power receiving unit 291 may further include a power sensing unit 2914 for monitoring the voltage and / or current of the rectified power. The power sensing unit 2914 may be configured as described above.

A wireless power transmission apparatus configured with one or more transmission coils

8 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with a resonant coupling scheme employable in the embodiments disclosed herein.

8, the power conversion section 111 of the wireless power transmission apparatus 100 according to the embodiments disclosed herein includes one or more transmission coils 1111b-1 to 1111b-n and a plurality of transmission coils And may be configured to include resonant circuits 1116-1 through 1116-n. The power conversion unit 111 may further include a multiplexer 1113 for establishing and releasing a connection of some of the one or more transmission coils 1111b-1 to 1111b-n .

The one or more transmission coils 1111b-1 to 1111b-n may be set to have the same resonance frequency, or may be set so that some have different resonance frequencies. Which is determined according to what inductance and / or capacitance the resonant circuits 1116-1 through 1116-n respectively connected to the one or more transmission coils 1111b-1 through 1111b-n have.

The frequency adjuster 1117 may change the inductance and / or capacitance of the resonant circuits 1116-1 through 1116-n connected to the one or more transmission coils 1111b-1 through 1111b-n, Or < / RTI >

In-band communication

9 illustrates a concept of transmitting and receiving packets between a wireless power transmission device and an electronic device through modulation and demodulation of a wireless power signal in wireless power transmission according to the embodiments disclosed herein.

Referring to FIG. 9, the power conversion unit 111 included in the wireless power transmission apparatus 100 forms a wireless power signal. The wireless power signal is formed through a transmission coil 1111 included in the power conversion unit 111.

The wireless power signal 10a formed by the power conversion unit 111 reaches the electronic device 200 and is received through the power receiving unit 291 included in the electronic device 200. [ The generated radio power signal is received through a receiving coil 2911 included in the power receiving unit 291.

The power reception control unit 292 controls the modulation / demodulation unit 293 connected to the power reception unit 291 to modulate the wireless power signal while the electronic device 200 receives the wireless power signal . When the received wireless power signal is modulated, the wireless power signal forms a closed-loop within a magnetic field or an electro-magnetic field, When modulating the wireless power signal while receiving a power signal, the wireless power transmission apparatus 100 may sense the modulated wireless power signal 10b. Demodulation unit 113 demodulates the detected radio power signal and decodes the packet from the demodulated radio power signal.

Meanwhile, a modulation method used for communication between the wireless power transmission apparatus 100 and the electronic device 200 may be amplitude modulation. As described above, in the amplitude modulation method, the modulation / demodulation unit 293 of the electronic device 200 side changes the amplitude of the wireless power signal 10a formed by the power conversion unit 111, The modulation and demodulation unit 293 of the base station 100 may be a backscatter modulation method for detecting the amplitude of the modulated radio power signal 10b.

Modulation and demodulation of wireless power signals

Modulation and demodulation of packets transmitted and received between the wireless power transmission apparatus 100 and the electronic apparatus 200 will be described below with reference to FIGS. 10 and 11. FIG.

10 illustrates a configuration for transmitting and receiving a power control message in a wireless power transmission according to the embodiments disclosed herein. FIG. 11 illustrates the form of signals in modulation and demodulation performed in a wireless power transmission in accordance with the embodiments disclosed herein.

Referring to FIG. 10, a wireless power signal received through the power receiving unit 291 on the electronic device 200 side is a wireless power signal 51 that is not modulated as shown in FIG. 11 (a). Resonance coupling is performed between the electronic device 200 and the wireless power transmission apparatus 100 according to the resonance frequency set by the resonance forming circuit 2912 in the power receiving unit 291 and the resonance frequency of the receiving coil 2911b The wireless power signal 51 is received.

The power reception control unit 292 modulates the wireless power signal 51 received through the power reception unit 291 by changing the load impedance in the modem unit 293. The modulation and demodulation unit 293 may be configured to include a passive element 2931 and an active element 2932 for modulating the wireless power signal 51. [ The modem unit 293 modulates the wireless power signal 51 to include a packet to be transmitted to the wireless power transmission apparatus 100. At this time, the packet may be input to the active element 2932 in the modem unit 293.

Thereafter, the power transmission control unit 112 of the wireless power transmission apparatus 100 demodulates the modulated wireless power signal 52 through an envelope detection process, and transmits the detected signal 53 And decodes it into digital data 54. The demodulation process detects that a current or a voltage flowing through the power conversion unit 111 is divided into two states according to a modulated wireless power signal, that is, a HI state and an LO state, The electronic device 200 obtains a packet to be transmitted by the electronic device 200 based on the digital data classified according to the type of the digital data.

Hereinafter, a process of acquiring the power control message to be transmitted by the electronic device 200 from the digital data demodulated by the wireless power transmission apparatus 100 will be described.

Referring to FIG. 11 (b), the power transmission control unit 112 detects an encoded bit using a clock signal CLK from an envelope-detected signal. The detected encoded bits are encoded according to the bit encoding method used in the modulation process on the electronic device 200 side. In some embodiments, the bit encoding method may be NRZ (non-return to zero). In some embodiments, the bit encoding method may be bi-phase encoding.

For example, in some embodiments, the detected bits may be differential bi-phase (DBP) encoded. According to the DBP encoding, the power reception control unit 292 of the electronic device 200 has two state transitions to encode the data bit 1, and one state transition to encode the data bit 0, . That is, the data bit 1 is encoded such that the transition between the HI state and the LO state occurs at the rising edge and the falling edge of the clock signal, and the data bit 0 is at the rising edge of HI State and the LO state may be encoded to occur.

On the other hand, the power transmission control unit 112 can obtain data in units of bytes by using a byte format that forms a packet from the bit stream detected according to the bit encoding method. In some embodiments, the detected bit stream may be transmitted using an 11-bit asynchronous serial format as shown in FIG. 11 (c). That is, it may include a start bit indicating the start of the byte and a stop bit indicating the end, and may include data bits (b0 through b7) between the start bit and the end bit. In addition, a parity bit for checking the error of the data may be added. The byte-by-byte data constitutes a packet including a power control message.

[When in-band two-way communication is supported]

Although the wireless power receiving apparatus 200 shown in FIG. 9 transmits a packet using a carrier signal 10a formed by the wireless power transmission apparatus 100, The device 100 may also transmit data to the wireless power receiving device 200 in a similar manner.

That is, the power transmission control unit 112 may control the modulation / demodulation unit 113 to modulate the data to be sent to the wireless power reception apparatus 200 to be written on the carrier signal 10a. In this case, the demodulation unit 293 is controlled to demodulate the power reception control unit 292 of the wireless power receiving apparatus 200 so that the power reception control unit 292 can acquire data from the modulated carrier signal 10a .

Packet format

Hereinafter, the structure of a packet used in communication using a wireless power signal according to the embodiments disclosed herein will be described.

12 illustrates a packet including a power control message used in a wireless power transfer method in accordance with the embodiments disclosed herein.

Referring to FIG. 12 (a), the wireless power transmission apparatus 100 and the electronic device 200 can transmit and receive data to be transmitted in the form of a command packet (command packet) 510. The command packet 510 may be configured to include a header 511 and a message 512.

The header 511 may include a field indicating a type of data included in the message 512. The size and type of the message can be determined based on a value indicated by a field indicating the type of the data.

In addition, the header 511 may include an address field for identifying a sender of the packet. For example, the address field may indicate an identifier of the electronic device 200 or an identifier of a group to which the electronic device 200 belongs. When the electronic device 200 wants to transmit the packet 510, the electronic device 200 generates the packet 510 so that the address field of the packet 510 indicates its own identification information can do.

The message 512 includes data that the sender of the packet 510 wants to transmit. The data included in the message 512 may be a report, a request, or a response to the other party.

Meanwhile, in some embodiments, the instruction packet 510 may be configured as shown in FIG. 12 (b). The header 511 included in the command packet 510 may be represented by a predetermined size. For example, the header 511 may be two bytes in size.

The header 511 may be configured to include a destination address field. For example, the destination address field may be six bits in size.

The header 511 may be configured to include an operation command field (OCF) or an operation group field (OGF). OGF is a value assigned to each group of commands for the electronic device 200 and OCF is a value assigned to each command included in each group including the electronic device 200. [

The message 512 may be divided into a parameter length field 5121 and a parameter value field 5122. That is, the sender of the packet 510 may configure the message in the form of length-value pairs (5121a-5122a, etc.) of one or more parameters required to express the data to be transmitted.

12C, the wireless power transmission apparatus 100 and the electronic apparatus 200 may transmit a packet having the preamble 520 and the checksum 530 added thereto for transmission in the command packet 510 And the data can be transmitted and received in the form of the data.

The preamble 520 is used for the wireless power transmission apparatus 100 to perform synchronization with data to be received and to accurately detect the start bit of the command packet 510. The preamble 520 may be configured to repeat the same bit. For example, the preamble 520 may be configured such that the data bit 1 according to the DBP encoding is repeated 11 to 25 times.

The checksum 530 is used to detect an error that may occur in the command packet 510 during the transmission of the power control message.

Phases

Hereinafter, the operation states of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 will be described.

13 illustrates operating states of a wireless power transmission apparatus 100 and a wireless power receiving apparatus 200 according to embodiments disclosed herein. 14 to 18 show the structure of packets including a power control message between the wireless power transmission apparatus 100 and the wireless power reception apparatus 200. [

13, the operation states of the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 for wireless power transmission are a Selection Phase 610, a Ping Phase 620, An Identification and Configuration Phase 630, and a Power Transfer Phase 640.

In the selected state 610, it is detected whether or not objects exist within a range where the wireless power transmission apparatus 100 can wirelessly transmit power. In the detection state 620, the wireless power transmission apparatus 100 100 sends a detection signal to the sensed object, and the wireless power receiving apparatus 200 sends a response to the detection signal.

Also, in the identification and setting state 630, the wireless power transmission apparatus 100 identifies the selected wireless power receiving apparatus 200 through the previous states and acquires setting information for power transmission. In the power transmission state 640, the wireless power transmission apparatus 100 adjusts power to be transmitted in response to a control message received from the wireless power reception apparatus 200, And transmits power.

Hereinafter, the respective operation states will be described in detail.

1) Selection Phase

The wireless power transmission apparatus 100 in the selected state 610 performs a detection process to select the wireless power receiving apparatus 200 existing in the sensing area. As described above, the sensing area refers to an area where an object in the area can affect the characteristics of the power of the power conversion part 111. [ The detection process for selecting the wireless power receiving apparatus 200 in the selected state 610, as compared with the detection state 620, receives a response from the wireless power receiving apparatus 200 using the power control message The power conversion unit of the wireless power transmission apparatus 100 detects a change in the amount of power for forming a wireless power signal and determines whether an object exists within a predetermined range. The detection process in the selected state 610 may be referred to as an analog detection process (analog ping) in that an object is detected using a wireless power signal without using a digital format packet in a detection state 620 to be described later .

The wireless power transmission apparatus 100 in the selected state 610 can sense that an object enters and exits the sensing area. In addition, the wireless power transmission apparatus 100 may distinguish the wireless power receiving apparatus 200 and other objects (e.g., keys, coins, etc.) capable of wirelessly transmitting power among objects in the sensing area .

As described above, since the distance over which the electric power can be transmitted wirelessly differs according to the inductive coupling method and the resonant coupling method, the sensing area where the object is detected in the selected state 610 may be different from each other.

First, when power is transmitted according to the inductive coupling scheme, the wireless power transmission apparatus 100 of the selected state 610 may monitor the interface surface (not shown) to detect placement and removal of objects.

In addition, the wireless power transmission apparatus 100 may sense the position of the wireless power receiving apparatus 200 placed on the interface surface. As described above, the wireless power transmission apparatus 100 formed to include one or more transmission coils enters the detection state 620 in the selected state 610 and uses each coil in the detection state 620 A method for confirming whether or not a response to the detection signal is transmitted from the object, or thereafter entering the identification state 630 and checking whether the identification information is transmitted from the object. The wireless power transmission apparatus 100 may determine a coil to be used for wireless power transmission based on the position of the sensed wireless power receiving apparatus 200 acquired through the above process.

In addition, when power is transmitted according to the resonant coupling scheme, the wireless power transmission apparatus 100 in the selected state 610 changes one or more of frequency, current, and voltage of the power conversion unit due to an object in the sensing area It is possible to detect the object.

Meanwhile, the wireless power transmission apparatus 100 in the selected state 610 can detect an object by at least one of the inductive coupling method and the resonant coupling method detection method. The wireless power transmission apparatus 100 performs an object detection process according to each power transmission method and then detects the object among the combining methods for wireless power transmission in order to proceed to other states 620, 630, and 640 You can choose one method.

On the other hand, the wireless power transmission apparatus 100 in the selected state 610 can detect a wireless power signal to detect an object and digital detection, identification, setting, and power transmission in the following states 620, 630, and 640 The characteristics of the wireless power signal, such as frequency, intensity, etc., may be different. This is because the selected state 610 of the wireless power transmission apparatus 100 corresponds to an idle phase for detecting an object so that the wireless power transmission apparatus 100 can reduce power consumption in the air, So that it is possible to generate a specialized signal for object detection.

2) Detection status (Ping Phase)

The wireless power transmission apparatus 100 in the detection state 620 detects a wireless power reception apparatus 200 existing in the sensing area through a power control message. In comparison with the detection process of the wireless power receiving apparatus 200 using the characteristics of the wireless power signal in the selected state 610, the detection process in the detection state 620 may be referred to as digital ping have.

In the detection state 620, the wireless power transmission apparatus 100 forms a wireless power signal for detecting the wireless power receiving apparatus 200, and transmits the wireless power signal modulated by the wireless power receiving apparatus 200 And obtains a power control message in the form of digital data corresponding to the response to the detection signal from the demodulated radio power signal. The wireless power transmission apparatus 100 can recognize the wireless power receiving apparatus 200 that is a target of power transmission by receiving a power control message corresponding to a response to the detection signal.

The detection signal formed by the wireless power transmission apparatus 100 in the detection state 620 to perform the digital detection process is a wireless power signal generated by applying a power signal of a specific operating point for a predetermined time . The operating point may refer to a frequency, a duty cycle and an amplitude of a voltage applied to the Tx coil. The wireless power transmission apparatus 100 may generate the detection signal generated by applying the power signal of the specific operating point for a certain period of time and attempt to receive a power control message from the wireless power receiving apparatus 200 have.

Meanwhile, the power control message corresponding to the response to the detection signal may be a message indicating the strength of the wireless power signal received by the wireless power receiving apparatus 200. For example, the wireless power receiving apparatus 200 may include a signal strength packet 5100 including a message indicating the strength of a received wireless power signal as a response to the detection signal as shown in FIG. 14 Can be transmitted. The packet 5100 may be configured to include a header 5120 indicating that the packet is a packet indicating the signal strength and a message 5130 indicating the strength of the power signal received by the wireless power receiving apparatus 200. The strength of the power signal in the message 5130 may be a value indicative of the degree of coupling of inductive coupling or resonant coupling for power transmission between the wireless power transmission apparatus 100 and the wireless power receiving apparatus 200 have.

After receiving the response message to the detection signal and finding the wireless power receiving apparatus 200, the wireless power transmission apparatus 100 may extend the digital detection process to enter the identification and detection state 630 have. That is, the wireless power transmission apparatus 100 can receive the power control message in the identification and detection state 630 by maintaining the power signal of the specific operating point after finding the wireless power receiving apparatus 200 have.

However, if the wireless power transmission apparatus 100 does not find a wireless power receiving apparatus 200 capable of transmitting electric power, the operation state of the wireless power transmission apparatus 100 returns to the selected state 610 .

3) Identification and Configuration Phase

The wireless power transmission apparatus 100 in the identification and setting state 630 can receive the identification information and / or the setting information transmitted by the wireless power receiving apparatus 200 and control the power transmission to be performed efficiently.

In the identifying and setting state 630, the wireless power receiving apparatus 200 may transmit a power control message including its identification information. For this purpose, the wireless power receiving apparatus 200 can transmit an identification packet (Identification Packet) 5200 including a message indicating the identification information of the wireless power receiving apparatus 200, for example, as shown in FIG. 15A have. The packet 5200 may be configured to include a header 5220 indicating that it is a packet indicating identification information, and a message 5230 including identification information of the wireless power receiving apparatus. The message 5230 includes information 2531 and 5232 indicating a version of a protocol for wireless power transmission, information 5233 identifying a manufacturer of the wireless power receiving apparatus 200, information indicating the presence or absence of an extension device identifier A base station identifier 5234 and a base unit identifier 5235. [ In addition, when it is indicated that the extension device identifier exists in the information 5234 indicating the presence or absence of the extension device identifier, an Extended Identification Packet 5300 including the extension device identifier as shown in FIG. 15B Can be transmitted separately. The packet 5300 may be configured to include a header 5320 indicating that the packet is an extension device identifier, and a message 5330 including an extension device identifier. When the extension device identifier is used as described above, it is possible to identify the wireless power receiving apparatus 200 based on the identification information 5233 of the manufacturer, the base unit identifier 5235 and the extension unit identifier 5330 Information can be used.

In the identifying and setting state 630, the wireless power receiving apparatus 200 may transmit a power control message including information on the estimated maximum power. For this purpose, the wireless power receiving apparatus 200 can transmit, for example, a configuration packet (Configuration Packet) 5400 as shown in FIG. The packet may be configured to include a header 5420 indicating that it is a configuration packet and a message 5430 containing information on the expected maximum power. The message 5430 includes a power class 5431, information 5432 about the expected maximum power, an indicator 5433 indicating how to determine the current of the primary cell on the wireless power transmission side, 5434). The indicator 5433 may indicate whether or not the current of the main cell of the wireless power transmission apparatus side is to be determined as specified in the protocol for wireless power transmission.

Meanwhile, the wireless power transmission apparatus 100 may generate a power transfer contract to be used for power charging with the wireless power reception apparatus 200 based on the identification information and / or the setting information. The power transfer protocol may include limits of parameters that determine the power transfer characteristics in the power transfer state 640. [

The wireless power transmission apparatus 100 may terminate the identification and setting state 630 and return to the selection state 610 before entering the power delivery state 640. [ For example, the wireless power transmission apparatus 100 may terminate the identifying and setting state 630 to find another wireless power receiving apparatus capable of receiving power wirelessly.

4) Power Transfer Phase (Power Transfer Phase)

The wireless power transmission apparatus 100 in the power transmission state 640 transmits power to the wireless power receiving apparatus 200. [

The wireless power transmission apparatus 100 receives a power control message from the wireless power receiving apparatus 200 during transmission of power and adjusts a characteristic of power applied to the transmission coil in accordance with the received power control message . For example, a power control message used to adjust the power characteristic of the transmission coil may be included in a control error packet 5500 as shown in FIG. The packet 5500 may be configured to include a header 5520 indicating that the packet is a control error packet and a message 5530 including a control error value. The wireless power transmission apparatus 100 may adjust the power applied to the transmission coil according to the control error value. That is, the current applied to the transmission coil is maintained when the control error value is 0, decreased when the control value is a negative value, and can be adjusted to increase when the control value is a positive value.

In the power transmission state 640, the wireless power transmission apparatus 100 may monitor parameters in a power transfer contract generated based on the identification information and / or the setting information. As a result of monitoring the parameters, if the power transmission to the wireless power receiving apparatus 200 violates the limitations contained in the power transfer protocol, the wireless power transmission apparatus 100 cancels the power transmission The selection state 610 can be returned.

The wireless power transmission apparatus 100 may terminate the power transmission state 640 based on the power control message transmitted from the wireless power receiving apparatus 200. [

For example, if the charging of the battery is completed while the wireless power receiving apparatus 200 is charging the battery using the transmitted power, the power requesting the wireless power transmission apparatus 100 to stop wireless power transmission Control messages can be transmitted. In this case, the wireless power transmission apparatus 100 may terminate the wireless power transmission and return to the selected state 610 after receiving the message requesting the suspension of the power transmission.

As another example, the wireless power receiving apparatus 200 may transmit a power control message requesting renegotiation or reconfiguration to update the already generated power transfer protocol. The wireless power receiving apparatus 200 may transmit a message requesting renegotiation of the power transfer protocol when a power amount that is more or less than the currently transmitted power amount is required. In this case, the wireless power transmission apparatus 100 may terminate the wireless power transmission and return to the identification and setting state 630 after receiving the message requesting renegotiation of the power transfer protocol.

To this end, the message transmitted by the wireless power receiving apparatus 200 may be, for example, an End Power Transfer Packet 5600 as shown in FIG. The packet 5600 may be configured to include a header 5620 indicating that the packet is a power transmission interruption packet and a message 5630 including a power transmission interruption code indicating the reason for the interruption. The power transmission interruption code may be a code for determining whether or not the power transmission interruption code is in a state of charge completion, an internal fault, an over temperature, an over voltage, an over current, a battery failure, a reconfigure, No Response, or Unknown.

A communication method of a plurality of electronic devices

Hereinafter, a method in which one or more electronic devices from one wireless power transmission apparatus performs communication using a wireless power signal will be described.

19 is a conceptual diagram showing a method by which a wireless power transmission apparatus transmits electric power to one or more wireless power reception apparatuses.

The wireless power transmission apparatus 100 may transmit power for one or more wireless power receiving apparatuses 200, 200 '. Although two electronic devices 200 and 200 'are shown in FIG. 19, the method according to the embodiments disclosed herein is not limited to the number of electronic devices shown.

The active area and the sensing area differ depending on the wireless power transmission scheme of the wireless power transmission apparatus 100. Therefore, the wireless power transmission apparatus 100 may be configured to determine whether there is a wireless power receiving apparatus disposed in an active region or a sensing region of a resonant coupling scheme, or whether a wireless power receiving apparatus It can be determined whether or not it exists. According to the determination result, the wireless power transmission apparatus 100 supporting each wireless power transmission scheme can change the power transmission scheme for each wireless power reception apparatus.

In the wireless power transmission according to the embodiments disclosed herein, when the wireless power transmission device 100 transmits power for one or more electronic devices 200, 200 'in the same wireless power transfer mode, (200, 200 ') can perform communication through the wireless power signal without colliding with each other.

The wireless power signal 10a formed by the wireless power transmission apparatus 100 reaches the first electronic device 200 'and the second electronic device 200, as shown in FIG. The first electronic device 200 'and the second electronic device 200 may transmit a power control message using the generated wireless power signal.

The first electronic device 200 'and the second electronic device 200 operate as power receiving devices for receiving wireless power signals. The power receiving apparatus according to embodiments disclosed herein may include a power receiving unit (291 ', 291) for receiving the formed wireless power signal; A modulation and demodulation unit (293 ', 293) for modulating and demodulating the received wireless power signal; And control units 292 'and 292 for controlling the respective components of the power receiving apparatus.

The wireless power transmission / reception method of the present invention has been described above with reference to the WPC standard. Furthermore, the present invention proposes a method of increasing the charging distance to increase the degree of freedom in the charging surface and transferring the charging distance between the transmitting device and the receiving device, when the magnetic induction method is used through the repeater. Hereinafter, this will be described in more detail.

How to increase charge distance in magnetic induction

Hereinafter, a method of increasing the charging distance in the wireless power transmission device and the wireless charging system will be described with reference to Figs. 20 to 23. Fig. More specifically, a structure and a control method of a wireless power transmission apparatus for increasing a charging distance in a magnetic induction manner will be described.

FIG. 20 is a perspective view showing a transmission apparatus having a repeater, and FIGS. 21, 22, and 23 are plan views of the transmission coil, the relay coil, and the reception coil shown in FIG. 20, respectively.

Referring to FIG. 20, the transmission apparatus 300 includes a main body 310 and a repeater 320.

The main body 310 may be a base station that provides power to the wireless power receiving apparatus 300a. The receiving device 300a may be, for example, a portable electronic device such as a smart phone, or an appliance such as a digital TV, an electric range, and an electronic burner.

The base station is an apparatus capable of providing near field inductive power and has an active area. The operating area may be part of the interface surface of the base station through which the magnetic flux will pass when the base station supplies power to the receiving device 300a. In this case, the distance from the coil to one surface (interface surface) of the base station may be 3.0 +/- 0.5 mm.

According to the illustrated embodiment, the main body 310 includes a transmission coil 311 (Primary Coil). The transmission coil is adapted to convert the magnetic flux through a current change to transmit radio power. The transmission coil 311 may be formed to be enclosed by a shielding part 312. For example, the transmission coil 311 may be integrally formed with the shielding portion. The shielding part 312 is configured such that the operation of the transmission coil 311 causes the elements (for example, a microprocessor) mounted on the circuit board to be subjected to electromagnetic influence, 311 are prevented from being influenced by electromagnetic waves.

In addition, a control unit for controlling the operation of the transmission coil 311 may be mounted on the main body 310. However, the present invention is not limited thereto, and the control unit may be provided separately from the main body. In this way, the transmission apparatus 300 itself can transmit the wireless power to the receiving apparatus, but in the present invention, the transmission distance of the wireless power is increased through the repeater 320.

The repeater 320 receives the radio power based on the magnetic flux of the transmission coil 311 and transmits the received radio power to the reception device. According to the illustration, the repeater 320 includes a relay coil 321, which is arranged to face the transmission coil 311 to transmit the received radio power to the receiver. In this case, the transmission coil 311 and the relay coil 321 may be spaced apart from each other by a distance of 0 mm to 20 mm.

In addition, the repeater 320 has a base station for providing power to the wireless power receiving apparatus, and the relay coil 321 is disposed at a distance of 1.2 mm at the bottom of the base station . At this time, the frequency band of the radio power is 120 to 140 kHz, and the input voltage to the transmission coil 311 may be 12V ± 5%.

Referring to Fig. 21, the transmission coil 311 is formed of a wire winding type so as to convert a current into a magnetic flux.

The transmission coil 311 may include a central region 313 having no coil formed therein and an empty space and a coil region 314 formed along the outer periphery of the central region 313 and having a coil wound thereon.

More specifically, the transmission coil 311 may be wound so that a 15 Watt litz wire has a triangular shape. Furthermore, the transmission coil 311 may be formed to have a triangular shape having rounded corners. For example, the transmission coil 311 may be arranged to be wound along the sides of an isosceles triangle.

In this case, the outer coil of the transmission coil 311 has an outer height of 88.1 mm, an outer width of 63.1 mm, an inner height of 64.1 mm, and an inner width of 39.1 mm. Also, the coil has a thickness of 3.0 +/- 0.3 mm, and the wire is wound eight times per layer in the multilayer (two layers).

The thickness of the shielding portion 312 superimposed on the transmission coil 311 is at least 0.7 mm. In this case, the upper limit of the thickness is not limited, but may be approximately 10 mm. The shield 312 may also be a rectangular plate 100 mm high and 70 mm wide.

22, the relay coil 321 is configured to induce an electromotive force using magnetic flux conversion and to generate magnetic flux conversion again according to the amplitude of the electromotive force.

The relay coil 321 is formed in a manner such that the wire is wound so as to convert a current into a magnetic flux according to the embodiments as in the case of the transmission coil 311. [

The relay coil 321 may have a central region 323 formed with no coil and an empty space and a coil region 324 formed along the outer periphery of the central region 323 and wound with a coil .

In this case, it is also possible to configure the series and parallel capacitors to be connected to the relay coil 321 to increase the reception efficiency of the radio power or for resonant detection.

More specifically, the relay coil 321 can be wound so that the 18 Watt litz wire has a circular shape. In this case, the outer diameter of the relay coil 321 may be 71.5 mm and the inner diameter thereof may be 25.3 mm. Also, the relay coil 321 has a thickness of 1.3 ± 0.3 mm, and the wire is wound 21 times in the single layer.

In this case, as the interface surface parameters, the distance between the transmission coil and the relay coil is Dz of 20 ± 0.5 mm, and the distance between the relay coil and the reception coil is Dz of 1.2 ± 0.5 mm. In addition, the coil inductance range may be L1 = 39.0 μH ± 10% for the transmission coil and L2 = 21.3 μH ± 10% for the relay coil. The resonant capacitor range can be C1 = 38.3 nF ± 5% for the transmit coil and C2 = 51.0 nF ± 5% for the relay coil.

Referring to FIG. 23, the receiving coil 331 may be a coil for receiving radio power by an induction method.

Like the transmission coil, the reception coil 331 has a central region 333 formed with no empty coil and a coil region 334 formed along the outer periphery of the central region 333, can do.

In this case, the receiving coil 331 may be in the form of a single coil or a plurality of coils. In addition, series and parallel capacitors may be connected to the receive coil 331 to increase the reception efficiency of the wireless power or to perform resonant detection.

At this time, a rectifying circuit is provided, and full-wave rectification is performed on the current to convert the alternating current into direct current. The rectifier circuit may be implemented by, for example, a full bridge rectifier circuit including four diodes or a circuit using active components.

According to the drawing, the receiving coil 331 can be wound so that the wire has a rectangular shape, and two single wire copper coils are wound in a plane. In this case, the diameter of the single-wire copper coil is 0.25 0.1 mm, the outer coil height of the receiving coil is 60.2 mm, the outer width is 49.7 mm, the inner height is 47.0 mm, , And the inner width may be 36.5 mm.

In this case, the inductance of the receiving coil 331 is 14.8 占 8 占 and the inductance when the shielding portion is attached to the coil bottom may have a value of 25.5 占 8 占 H. In this case, the Q value of the receiving coil 331 may be 55 to 65 and the resonance frequency may be 150 +/- 30 kHz.

As described above, in the present invention, by arranging the transmission coil-relay coil-reception coil, the distance between the transmission device and the reception device can be increased along with the freedom on the charging surface.

Transmitter and repeater compatible with induction and resonance in wireless charging system

Hereinafter, a method of expanding the operating area in the wireless charging system will be described with reference to FIGS. More particularly, the present invention relates to a method for a wireless charging transmitter structure that can be used for both receiving portions of an already-commercialized induction method of wireless power and a conventional resonance method, and a method of extending a charging distance using a repeater Explain.

WPC is already inductive in wireless charging and has set the communication method between transmission device and receiving device. On the other hand, the fundamental principle of using electromagnetic induction is the same, but the resonance method is classified according to the frequency matching of the transmitting device and the receiving device and the high and low of the Q value. Generally, the Q value is increased to increase the coupling between the transmitting device and the receiving device, The transmission distance can be improved. That is, according to the resonance method, a higher coupling between the transmission device and the reception device is provided, and the degree of freedom in distance and attitude can be increased.

In order to increase the degree of freedom and increase the power efficiency at the same time, coil design technology is required for transmission and reception devices. However, in order to enter into a new resonance mode in an induction mode in which a market has already been established, it may be considered that a transmission device capable of coping with both modes in a transitional period can be considered .

Accordingly, in the present invention, a coil and a relaying method compatible with an inductive receiving apparatus and a receiving apparatus in a resonant manner are proposed in wireless charging.

FIGS. 24 and 25 are a conceptual diagram and a block diagram of a charging method compatible with the induction method and the resonance method, FIG. 26 is a configuration diagram of the relay device of FIG. 20, FIGS. 27A and 27B illustrate transmission And a top view and a front view of the coil.

24 and 25, the transmission coil 411 transmits the radio power of the first frequency band, and the relay coil 421 transmits the radio power of the received first frequency band to the radio power of the second frequency band And transmitted.

For example, the transmission coil 411 is configured to generate a magnetic field that transmits inductive power, and the relay coil 421 uses a power derived from the magnetic field to generate a magnetic field that oscillates at a resonant frequency . In this case, the first frequency band may be lower than the second frequency band. And the receiving device can receive the power in a resonant manner through the power transmission of the resonant mode performed in the relay coil.

Referring to FIG. 24 (a), when charging is performed in the vicinity of a few hundred kHz band, the ISM band band receiving apparatus can be charged in a state where the distance in the z axis direction is increased with the repeater.

As another example, it is also possible to switch the resonance type power to the induction type. More specifically, the transmission coil 511 is formed so as to generate a magnetic field that transmits a resonance-type power, and the relay coil 521 is made to generate an induced magnetic field using the electric power derived from the magnetic field. In this case, the first frequency band may be higher in frequency than the second frequency band. The receiving device can receive the power in an inductive manner through the inductive power transmission performed in the relay coil 521. [

Referring to FIG. 24 (b), a receiving apparatus corresponding to the ISM band band is charged at a close distance from the transmitting apparatus (or the repeater), and the receiving apparatus having a band of several hundred kHz is provided with a repeater, Can be charged in an increased state.

26, the relay coil 421 may include a first relay coil 421a, a conversion circuit 421b, and a second relay coil 421c. In this case, have.

The first relay coil 421a receives the radio power of the first frequency band and the converting circuit 421b converts the frequency of the radio power received from the first relay coil 421a into the second frequency band Conversion. To this end, when the first frequency band is higher in frequency than the second frequency band, the converting circuit 421b includes a rectifier, a regulator, and a bridge circuit. Also, when the first frequency band is lower in frequency than the second frequency band, the converting circuit 421b includes a rectifier, a regulator, and a power amplifier.

The second relay coil 421c is connected to the conversion circuit 421b to transmit the radio power of the second frequency band. In this case, the first relay coil 421a and the second relay coil 421c are disposed to face each other, and the shielding member 422 is disposed between the first relay coil 421a and the second relay coil 421c As shown in FIG.

At this time, the relay coil 421 is formed such that the wire is wound so as to convert a current into a magnetic flux. More specifically, the relay coil 421 may be wound so that the 18 Watt litz wire has a circular shape. In this case, the outer diameter of the relay coil 321 may be 71.5 mm and the inner diameter thereof may be 25.3 mm. Also, the relay coil 321 has a thickness of 1.3 ± 0.3 mm, and the wire is wound 21 times in the single layer.

In addition, the inductance of the relay coil 421 is 21.3 + - 4 μH, the Q value is 15 to 30, and the resonant frequency can be 150 ± 20 kHz.

27A and 27B, the transmission coil 411 includes first and second coils 411a and 411b, and the first and second coils 411a and 411b are overlapped with each other.

The first coil 411a is formed to generate a magnetic field to transmit inductive power, the second coil 411b is wound to surround the first coil, and the resonance frequency To generate a vibrating magnetic field.

The first coil 411a of the induction type is a transmission coil that supports a band of several hundreds of kHz (100 to 200kHz), and the second coil 411b of the resonance type is a transmission coil that supports the ISM band (6.78MHz) have.

The z-axis arrangement between the two coils can be placed at the top or bottom or at the same position. Also, the first and second coils 411a and 411b may be formed by stacking two layers of a Litz wire or a circuit board (PCB). In this case, the diameter of the first coil 411a may be smaller than that of the second coil 411b, and the first coil 411a may be disposed on the upper side in the case where the first coil 411a is vertically spaced.

More specifically, the transmission coil 411 is formed of a type in which a wire is wound in a multilayer (two layers) so as to convert a current into a magnetic flux. More specifically, the transmission coil 411 may be wound so that a 15 Watt litz wire has a triangular shape.

The inductance of the transmission coil 411 has a value of 23.0 ± 4 μH and the inductance of the transmission coil 411 may be 39.0 ± 4 μH when the shield 312 is attached to the lower end of the coil. In this case, the Q value of the transmission coil 411 may be 450 to 600 and the resonance frequency may be 150 +/- 30 kHz.

Meanwhile, the control unit of the wireless power transmission apparatus may be configured to apply power to the first and second coils individually, and to control the power of the wireless power transmission apparatus by any one of the induction method and the resonance method Decide whether to transmit power. Hereinafter, such determination and conversion of the system will be described in more detail. FIG. 28 is a conceptual diagram showing an example of a method of driving the transmission coil of FIG. 27A, and FIG. 29 is a block diagram of a circuit connected to the transmission coil of FIG. 27A.

28, the transmitter sequentially generates a digital ping signal for waking up the receiver of the ISM band frequency band and a digital ping signal for waking up the receiver of the several hundred kHz band on a TDM basis, The transmission frequency is determined according to the packet information transmitted from the receiving apparatus. This makes it possible to achieve inductive and resonance compatibility.

Referring to FIG. 29, for induction and resonance compatibility, the body includes a circuit portion electrically connected to the transmission coil, and the circuit portion shifts the first frequency band by changing the electrical connection of the plurality of capacitors, do.

According to the example, the control portion is formed to control the driving circuit portion. The driving circuit includes a first switch SW1 connected to the first capacitor C1 and a second switch SW2 connected to the second capacitor C2. The second capacitor C2 is connected in parallel to the transfer coil.

The first and second switches SW1 and SW2 are controlled to apply any one of the first and second frequency bands to the transmission coil depending on whether the transmission scheme is an induction scheme or a resonance scheme.

According to the above-described mechanism, a relay method compatible with an inductive receiving apparatus and a resonant receiving apparatus in wireless charging can be implemented.

The configuration of the wireless power transmission apparatus according to the embodiments disclosed herein may be applied to devices such as a docking station, a cradle device, and other electronic devices, May be readily apparent to those skilled in the art.

The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention can be modified, changed, or improved in various forms within the scope of the present invention and the claims.

Claims (20)

A wireless power transmission apparatus formed to transmit power wirelessly to a wireless power receiving apparatus,
A main body having a transmission coil for converting a magnetic flux through a current change to transmit wireless power; And
And a relay coil disposed to receive the wireless power based on the magnetic flux conversion and to face the transmission coil to transmit the received wireless power to the receiving device. The method according to claim 1,
The repeater having a base station for providing power to the wireless power receiving apparatus,
Wherein the relay coil is disposed at a lower portion of the base station at a distance of up to 1.2 mm. 3. The method of claim 2,
Wherein the frequency band of the wireless power is 120 to 140 kHz and the input voltage to the transmission coil is 12V +/- 5%. The method according to claim 1,
Wherein the transmission coil is wound so that a 15 Watt litz wire has a triangular shape. 5. The method of claim 4,
The outer coil of the transmission coil has an outer height of 88.1 mm, an outer width of 63.1 mm, an inner height of 64.1 mm, and an inner width of 39.1 mm. Wireless power transmission device. The method according to claim 1,
Wherein a shielding portion overlapping the coil is disposed on the body, and the thickness of the shielding portion is at least 0.7 mm. The method according to claim 1,
Wherein the relay coil is wound so that the 18 Watt litz wire has a circular shape. 5. The method of claim 4,
Wherein the relay coil has an outer diameter of 71.5 mm and an inner diameter of 25.3 mm. 5. The method of claim 4,
Wherein the relay coil has a thickness of 1.3 +/- 0.3 mm. The method according to claim 1,
Wherein the transmission coil transmits radio power of a first frequency band and the relay coil converts the radio power of the received first frequency band into radio power of a second frequency band and transmits the radio power of the second frequency band. . 11. The method of claim 10,
Wherein the first frequency band is lower in frequency than the second frequency band. 12. The method of claim 11,
Wherein the transmission coil is configured to generate a magnetic field that transmits inductive power and the relay coil is configured to generate a magnetic field that oscillates at a resonant frequency using power derived from the magnetic field. . The method according to claim 1,
The relay coil includes:
A first relay coil for receiving radio power of the first frequency band;
A conversion circuit for converting the frequency of the radio power received in the first relay coil into the second frequency band; And
And a second relay coil connected to the conversion circuit for transmitting the radio power of the second frequency band. 14. The method of claim 13,
Wherein the first relay coil and the second relay coil are arranged to face each other. 14. The method of claim 13,
Wherein the repeater further comprises a shielding member disposed between the first relay coil and the second relay coil. The method according to claim 1,
The transmission coil includes:
A first coil formed to generate a magnetic field to transmit inductive mode power; And
And a second coil wound to surround said first coil and configured to generate a magnetic field that oscillates at a resonant frequency to transmit resonant mode power. 17. The method of claim 16,
Wherein the control unit of the wireless power transmission apparatus comprises:
Wherein power is individually applied to the first and second coils and the power of the induction system or the resonance system is determined by using the response of the wireless power receiving apparatus to the power application Wireless power transmission device. 17. The method of claim 16,
The body further includes a circuit portion electrically connected to the transmission coil,
Wherein the circuit portion changes the electrical connection of the plurality of capacitors to shift the first frequency band. A transmission device formed to transmit wireless power; And
And a receiving device configured to receive wireless power from the transmitting device,
The transmission apparatus includes:
A main body having a transmission coil for converting a magnetic flux through a current change to transmit wireless power; And
And a relay coil disposed to receive the wireless power based on the magnetic flux conversion and arranged to face the transmission coil to transmit the received wireless power to the receiving device. 20. The method of claim 19,
Wherein the relay coil has a circular shape in which the outer diameter of the relay coil is 71.5 mm and the inner diameter thereof is 25.3 mm.

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