KR101731447B1 - Wireless power transmitter and method for controlling the same - Google Patents

Abstract

The present invention relates to a method of controlling a wireless power transmission apparatus for wirelessly transmitting power, comprising the steps of: measuring a degree of deterioration of a Q value of a reference transmission apparatus; and after positioning at least one reception apparatus on the reference transmission apparatus, Measuring a degree of deterioration of a Q value of a transmitting apparatus; detecting a Q value having a minimum degree of deterioration among the degree of deterioration of the Q value for each of the at least one receiving apparatus; And setting a limit value of the Q value, wherein the fitness of the wireless power transmission apparatus is determined by using the limit value of the set Q value.

Description

[0001] WIRELESS POWER TRANSMITTER AND METHOD FOR CONTROLLING THE SAME [0002]

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission apparatus and a control method thereof.

In general, instead of a method of supplying electrical energy to a wireless power receiving apparatus by wire, recently, a method of wirelessly supplying electric energy without contacting is 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) The standard document of the Wireless Power Association describes a method of transferring power from one wireless power transmission device to one wireless power receiving device by a magnetic induction method.

It is an object of the present invention to provide a wireless power transmission apparatus and a control method thereof capable of detecting not only the presence or absence of an external metallic material, but also the amount of power consumed by the external metallic material.

It is another object of the present invention to provide a wireless power transmission apparatus and a control method thereof capable of detecting various information related to an external material.

It is another object of the present invention to provide a wireless power transmission apparatus capable of secure one-to-one communication and a control method thereof.

A method of controlling a wireless power transmission apparatus for wirelessly transmitting power, the method comprising the steps of: measuring a degree of deterioration of a Q value of a reference transmission apparatus; and after positioning at least one reception apparatus on the reference transmission apparatus, Measuring a deterioration degree of the Q value and a Q value having the lowest deterioration degree among the deterioration degree of the Q value for each of the at least one receiving apparatus; And determining a suitability of the wireless power transmission apparatus by using the limit value of the set Q value.

In one embodiment, the limit value of the Q value is defined as: " (a) " Q _threshold = (Q _{Tx - self} + Q _{W / FO} ) / 2

In one embodiment, the step of measuring the degree of deterioration of the Q value of the reference transmitting device by the at least one receiving device may comprise: positioning one of the at least one receiving device in the first position; Measuring a first value indicative of a degree of deterioration of a Q value at a first position, and a second value indicating a degree of deterioration of a Q value at the second position, The method of claim 1, further comprising the step of:

In one embodiment, the step of measuring the degree of deterioration of the Q value of the reference transmitting apparatus by the at least one receiving apparatus sequentially detects a first value and a second value with respect to the at least one receiving apparatus, And a limit value of Q is set using the largest one of the first and second values detected by each of the at least one receiving apparatuses.

In one embodiment, after setting the limit value of the Q value, for a receiving apparatus that is not the at least one receiving apparatus, the first and second receiving apparatuses, which are the degree of deterioration of the Q value at the first and second positions, And comparing the measured value with a threshold value of the Q based on a smaller one of the first and second values.

A control method of a wireless power transmission apparatus capable of wirelessly receiving power, the method comprising: a step of, when a reference reception apparatus is located on the wireless power transmission apparatus for a wireless power transmission apparatus capable of wireless power transmission, The degree of deterioration of the value of the Q value in the wireless power transmission apparatus when at least one receiving apparatus other than the reference receiving apparatus is on the wireless power transmitting apparatus, And setting a specification of the wireless power transmission apparatus using a Q value of the worst deterioration degree among the degree of deterioration of the Q value for the at least one reception apparatus and a Q value of the reference reception apparatus, .

In one embodiment, the step of measuring the degree of deterioration of the Q value of the reference receiving apparatus measures a degree of deterioration of the Q value when the reference receiving apparatus is at the first position. Measuring a degree of deterioration of the Q value in the first position and a degree of deterioration of the Q value in the first and second positions, and detecting a Q value having a smaller value.

In one embodiment, measuring the degree of deterioration of the Q value for the at least one receiving device comprises measuring the degree of deterioration of the Q value when the at least one receiving device is in the first position, Measuring the degree of deterioration of the Q value when one receiving apparatus is in the second position and detecting a Q value having the largest value among degrees of deterioration of the Q value at the first and second positions .

In one embodiment, the method further comprises setting a specification of the wireless power transmission apparatus using the difference between the Q value detected for the reference receiving apparatus and the Q value detected at the at least one receiving apparatus.

In one embodiment, the suitability of the wireless power transmission apparatus is determined to be appropriate when the difference value of the Q value is greater than a predetermined value associated with at least one of resolution, measurement error, and strength of the wireless power transmission apparatus do.

A wireless charging system capable of transmitting and receiving wireless power, the wireless charging system comprising a transmitting device configured to transmit wireless power and a receiving device configured to receive wireless power, the transmitting device measuring a degree of deterioration of the Q value of the reference transmitting device Measuring a degree of deterioration of a Q value of the reference transmitting apparatus after positioning at least one receiving apparatus on the reference transmitting apparatus and measuring a deterioration degree of the Q value of each of the at least one receiving apparatus Detecting a small Q value and setting a limit value of the Q value using the Q value with the smallest deterioration degree, and using the limit value of the set Q value, .

In one embodiment, the limit value of the Q value is defined as: " (a) " Q _threshold = (Q _{Tx - self} + Q _{W / FO} ) / 2

In one embodiment, the step of measuring the degree of deterioration of the Q value of the reference transmitting device by the at least one receiving device may comprise: positioning one of the at least one receiving device in the first position; Measuring a first value indicative of a degree of deterioration of a Q value at a first position, and a second value indicating a degree of deterioration of a Q value at the second position, The method of claim 1, further comprising the step of:

A wireless charging system capable of transmitting and receiving wireless power, the wireless charging system comprising a transmitting device configured to transmit wireless power and a receiving device configured to receive wireless power, the transmitting device including a reference receiver Measuring the degree of deterioration of the Q value of the at least one receiving device and measuring the degree of deterioration of the Q value for the at least one receiving device different from the reference receiving device, And setting the specification of the transmitting apparatus using the Q value of the reference receiving apparatus and the Q value of the worst case of the deterioration degree of the reference receiving apparatus.

In one embodiment, the limit value of the Q value is related to at least one of resolution, measurement error and intensity of the transmitting apparatus.

The wireless power transmission apparatus and the control method thereof according to the embodiments of the present invention can provide a transmission apparatus with higher accuracy by using a transmission apparatus having a limited deterioration degree of the Q value when determining the presence or absence of an external metallic material .

The wireless power transmission apparatus and the control method thereof according to the embodiments of the present invention can reduce the deterioration degree of the Q value in the reception apparatus and the transmission apparatus according to the WPC standard, Can be increased.

1 is an exemplary diagram conceptually showing a wireless power transmission device and an electronic device according to embodiments of the present invention.
2 (a) and 2 (b) are block diagrams illustrating exemplary configurations of a wireless power transmission device and an electronic device that can be employed in the embodiments disclosed herein.
FIG. 3 illustrates a concept that power is transmitted from a wireless power transmission apparatus to an electronic apparatus wirelessly according to an inductive coupling scheme.
4A and 4B are block diagrams exemplarily showing a part of the configuration of an electromagnetic induction type wireless power transmission apparatus and an electronic apparatus 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.
6 shows a concept that power is transferred from a wireless power transmission device to an electronic device wirelessly according to a resonant coupling scheme.
7A and 7B are block diagrams exemplarily showing a part of a configuration of a wireless power transmission device and an electronic device in a resonance mode that can be employed 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.
FIG. 9 is a block diagram showing a wireless power transmission apparatus further including an additional configuration in addition to the configuration shown in FIG. 2 (a).
FIG. 10 shows a configuration in which an electronic device according to the embodiments disclosed herein is implemented in the form of a mobile terminal.
11 illustrates the 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 the wireless power transmission disclosed herein.
12 shows a method of displaying data bits and bytes constituting a power control message by the wireless power transmission apparatus.
FIG. 13 illustrates a packet including a power control message used in a wireless power transfer method in accordance with the embodiments disclosed herein.
14 illustrates operating states of a wireless power transmission device and an electronic device according to the embodiments disclosed herein.
15 to 19 show the structure of packets including power control messages between the wireless power transmission apparatus and the electronic apparatuses.
20 is a conceptual diagram showing heat generation due to an external substance in a wireless power transmission apparatus.
21 and 22 are conceptual diagrams showing a conventional method of detecting a foreign substance.
23 is a flowchart illustrating a method of determining suitability of a wireless power transmission apparatus in a wireless power transmission apparatus according to the present invention.
24 is a conceptual diagram showing a method of measuring the degree of deterioration of the Q value.
25 is a flowchart illustrating a method of setting a specification of a transmitting apparatus according to an embodiment of the present invention.
26 is a conceptual diagram showing a method of measuring a Q value for setting a standard of the transmission apparatus.

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.

Referring to FIGS. 4A, 4B, and 5, the components of the power conversion unit 111 that follow the inductive coupling scheme will be described with reference to FIGS. 7 and 8. FIG. Described below.

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 elements included in the power receiving unit 291, those following the inductive coupling scheme will be described with reference to FIGS. 4A and 4B, and the ones 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

4A and 4B are block diagrams illustrating a portion of the configuration of a wireless power transmission apparatus 100 and a wireless power reception apparatus 200 of a 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.

The power conversion unit 111 may 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 resonance 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 resonance 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.

The power conversion unit 111 may 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.

Operation status ( 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 status ( 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 setting status ( 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 transmission status ( 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 area or a sensing area 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. Hereinafter, a method of detecting a foreign substance other than the wireless power receiving apparatus in the wireless power transmission apparatus will be described in more detail with reference to the drawings.

A method for transmitting and receiving wireless power using a flux link between the wireless power transmission apparatus (100) and the wireless power reception apparatus (200), the method comprising: When an external metallic material (for example, a metallic material (conductor) such as a clip, can, etc.) is placed at a position adjacent to the device 200, the external metallic material may be heated by the magnetic flux. Here, the external material may mean any material other than the receiving device placed on the interface surface of the transmitting device.

20 is an exemplary view showing a cause of heat generation of an external metallic material 300 located in a wireless power transmission apparatus 100 according to an embodiment of the present invention.

20, when a magnetic flux B passes through the external metal material (conductor) 300, a sine of an angle (?) Formed by the surface of the external metallic material 300 and the magnetic flux, A current I proportional to the value of the current I is induced which causes a heat generation proportional to the resistance value calculated from the resistivity coefficient p of the external metallic material 300. [

Meanwhile, in the wireless power transmission apparatus 100, in order to solve the stability problem related to the heat generation of the external material, various methods of detecting external materials have been proposed.

One of the methods for detecting external materials may be a power loss detection (PLD) method for detecting the amount of power loss consumed in the external material. 21, in the wireless charging system, the self loss (P _Txloss ) and the power (P ₁ ) of the transmission coil, the self loss (P ₂ ) at the reception device, and the power (P _Rxloss ) The presence or absence of an external metallic substance can be determined.

This is a method which is mainly used in a low power transmission apparatus, and a separate additional device is unnecessary, so that foreign substances can be easily detected. However, this method has a large number of variables to be measured in order to estimate the own loss of the transmitting / receiving part, and therefore there is a high possibility that measurement errors will occur. In addition, the measurement error tends to occur more in the medium power and high power devices, and the method of detecting the power loss is difficult to apply to the medium power and high power devices. In addition, the power loss detection method has a disadvantage in that there is a high possibility that a compatibility problem occurs due to a change of the receiving apparatus.

Alternatively, referring to FIG. 22, there is a method of measuring a change in inductance of a transmitting apparatus. This method uses a characteristic that the magnetic flux of the coil changes due to the external metal. At this time, the inductance change measuring method needs an extra device to measure the change of the inductance, but it has an advantage of being free from the compatibility problem.

However, there is a disadvantage in that the inductance change measuring method has a difference in inductance change measurement depending on the kind of the external metal and the coil type, and the distinguishable region of the change in inductance of the external metal and the coil is narrow.

As another method, there is a Q change measurement method of a transmission apparatus. The Q change measurement method utilizes the property that the resistance of the circuit increases due to the eddy currents generated on the surface of the external material. In the Q change measurement method, when the external material is a metal, a characteristic in which the inductance changes according to the specific magnetic permeability of the metal may also be used.

That is, in the Q change measurement method, the Q value is a variable that is influenced by the resistance component and the inductance, and the presence or absence of the external material can be detected using the change of the Q value according to the resistance component and the inductance change.

The Q change measurement method is advantageous in that it is possible to distinguish the presence of an external substance from the inductance change measurement method. However, the Q change measurement method must have a separate measurement circuit for measuring Q, and there is a disadvantage in that power transmission is interrupted when the Q value is measured.

In addition, when the Q value is deteriorated by the metal component of the receiving apparatus itself, it is difficult to distinguish the Q value from the foreign substance. On the other hand, in the WPC, the conventional Q change measurement method sets the same Q limit value collectively without considering the type of the receiving device, but the discussion of setting different Q limit values according to the type of the receiving device continues .

Therefore, the present invention proposes a limitation of a transmitting / receiving device for reducing an error in detection of a foreign substance, which occurs when the Q degradation due to the metal component of the receiving device itself is large in the Q change measuring method. 23 is a flowchart illustrating a method of determining suitability of a wireless power transmission apparatus in a wireless power transmission apparatus according to the present invention. 24 is a conceptual diagram showing a method of measuring the degree of deterioration of the Q value.

First, in the wireless charging system according to the embodiment of the present invention, the step of measuring the degree of deterioration of the Q value of the reference transmission apparatus may be performed (S2310).

The reference transmission apparatus may refer to a wireless power transmission apparatus satisfying a predetermined standard. For example, the reference transmission apparatus may be a transmission apparatus capable of transmitting wireless power according to the WPC standard. In this case, the term "transmitting apparatus" is used in the same sense as a transmitting apparatus for transmitting wireless power. In the following description, terms of a transmitting apparatus and a transmitting apparatus can be interpreted in the same sense.

The degree of deterioration of the Q value may indicate how much the Q value when the receiving apparatus is detected on the transmitting apparatus is reduced on the basis of the Q value of the receiving apparatus and the transmitting apparatus itself in which no object is detected on the transmitting apparatus.

Thereafter, in the wireless charging system according to the embodiment of the present invention, the step of measuring the degree of deterioration of the Q value of the reference transmission apparatus may be performed after positioning at least one reception apparatus on the reference transmission apparatus (S2320 ).

Here, the at least one receiving apparatus may be a receiving apparatus according to a predetermined standard. For example, the at least one receiving apparatus may be a receiving apparatus having a predetermined standard in the detection of a foreign substance in the WPC standard.

Hereinafter, a receiving apparatus conforming to the WPC standard will be described. However, the present invention is not limited thereto, but may be applied to various receiving apparatuses having various specifications.

The present invention can measure Q values that are different from each other according to the position of the receiving device 2410 on the transmitting device 2400 for each of the receiving devices. More specifically, referring to FIG. 24, the transmitting apparatus 2400 may be divided into an active area 2401 and an inactive area. Here, the active area 2401 may be an area where wireless power can be transmitted to the receiving apparatus. This can be determined by the alignment of the coil of the transmitter 2400 and the alignment of the coil of the receiver 2410. Conversely, the inactive area may be a region where wireless power can not be transmitted to the receiving device.

At this time, when the center of the receiving apparatus is within the active area 2401, the receiving apparatus 2410 can receive the wireless power. The present invention can measure the Q value when the receiving device 2410 is completely contained within the active area 2401 and when the receiving device 2410 is at the limit position where it can receive wireless power . Here, when it is the limit position, it may mean that the center of the receiving device 2410 is located at the edge of the active area 2401. [

More specifically, as shown in FIG. 24A, the present invention can detect the Q value in the first position where the receiving device 2410 is completely contained within the active area 2401 . 24 (b), the present invention can detect the Q value at the second position where the center of the receiving device 2410 is located at the edge of the active area 2401 .

Thereafter, the present invention can detect the Q value at each of the first and second positions for all three receiving apparatuses.

After detecting the Q value at each position, the present invention can proceed to a step of detecting Q value having the smallest deterioration degree among the degree of deterioration of the Q value for each of the at least one receiving apparatus (S2330).

That is, the present invention can detect the Q value having the lowest degree of deterioration among the detected Q values in order to reduce the error in the detection of the foreign substance by the transmitting apparatus. For example, after detecting the degree of deterioration of six Q values for three receiving apparatuses, it is possible to detect a Q value having the smallest deterioration degree among the degrees of deterioration of the six Q values.

Then, the present invention can proceed to a step of setting a limit value of the Q value using the Q value having the smallest degree of deterioration (S2340).

The present invention can set a limit value of the Q value measurable by the transmitting apparatus 2400 in the foreign substance detection. The limit value of the Q value may mean a value that is a criterion for determining the foreign substance and the receiver 2410 in the transmitter 2400. More specifically, in the present invention, when Q is deteriorated more greatly based on the deterioration degree of Q set by using the limit value of Q, it is judged that it is an external material, and when it is smaller, It can be determined to be the receiving apparatus. That is, in the wireless charging system, the limit value of the Q value can be used to limit the determination of the foreign substance according to the deterioration degree of Q.

On the other hand, the limit value of the Q value can be set in various ways. In one embodiment, the limit value of the Q value can be detected by Equation (2).

: Q의 한계값,

: 송신장치 자체의 Q값,

: 수신장치가 있는 경우의 송신장치의 Q 값 )(

: Limit value of Q,

: The Q value of the transmitting apparatus itself,

: Q value of the transmitting apparatus when there is a receiving apparatus)

That is, in setting the limit value of the Q value, the present invention can be set in consideration of the degree of deterioration of the receiving apparatus conforming to a predetermined standard and the degree of deterioration of the transmitting apparatus itself. Therefore, the present invention can detect foreign substances more stably.

At this time, since the limit value of the Q value is set in consideration of the degree of deterioration due to the metallic material of the receiving apparatus itself, it is possible to reduce the error of detecting the foreign substance.

After the limit value of Q is set, the wireless charging system according to the present invention can proceed with determining the suitability of the wireless power transmission apparatus based on the limit value of the Q value (S2350).

In the wireless charging system according to the present invention, a limit value of a Q value that can be determined by the transmitter can be set in order to provide a transmitter capable of accurately distinguishing between a foreign substance and a receiver.

That is, in a transmitting apparatus capable of distinguishing between a foreign substance and a receiving apparatus according to the degree of deterioration of the Q value, by limiting a range for determining the degree of deterioration of the Q value, a transmitting apparatus capable of judging a foreign substance more stably can do.

For example, in a transmitting apparatus in which a limit value of a Q value is set, when radio power is transmitted to an arbitrary receiving apparatus, the presence or absence of an external substance is determined by determining the deterioration degree of the Q value.

At this time, if the degree of deterioration is greater than the degree of deterioration due to the limit value of the Q value, the transmitting apparatus determines that it is an external material, and if the degree of deterioration is smaller, the transmitting apparatus can determine that it is a proper receiving apparatus.

Further, since the transmitting apparatus considers the degree of deterioration of the receiving apparatus itself when setting the limit value of Q, even if the degree of deterioration of Q due to the metallic material of the receiving apparatus itself is large, can do.

Therefore, the transmitting apparatus according to the present invention can determine the Q value by considering the deterioration of the Q value due to the metal material of the receiving apparatus itself by setting the limit value of the Q value.

In the above, a method of setting the specification of the transmitting apparatus by considering the degree of deterioration of the Q value by a plurality of receiving apparatuses on the basis of the reference transmitting apparatus has been described. Hereinafter, a method of setting the limit value of the Q value of the transmitting apparatus by comparing the deterioration degree of the Q value with respect to the plurality of receiving apparatuses on the basis of the reference receiving apparatus will be described. FIG. 25 is a flowchart illustrating a method of setting a standard of a transmitting apparatus according to an embodiment of the present invention, and FIG. 26 is a conceptual diagram illustrating a method of measuring a Q value for setting a standard of the transmitting apparatus.

In the wireless charging system according to the present invention, the step of measuring the degree of deterioration of the Q value by the reference receiving apparatus may be performed with respect to the transmitting apparatus capable of wirelessly transmitting power (S2510).

The reference reception apparatus may be a reception apparatus conforming to a predetermined standard. For example, the reference receiving apparatus may be a receiving apparatus conforming to the WPC standard.

At this time, the present invention can detect the degree of deterioration of the Q value at the first and second positions with respect to the reference receiving apparatus. In this case, the present invention can detect a Q value with a higher degree of deterioration in the degree of deterioration of the Q value at the first and second positions.

For example, as shown in Fig. 26 (a), the transmitting apparatus 2600 can measure the degree of deterioration of the Q value when the reference receiving apparatus 2610 is in the first position. 26 (b), the transmission apparatus 2600 can measure the degree of deterioration of the Q value when the reference reception apparatus is at the second position.

Here, the first position is when the position of the receiving device 2610 is located inside the active area 2601 of the transmitting device 2600, and the second position is when the center of the receiving device 2610 is positioned within the active area 2601 Is located at the edge of the active area 2601 of the device 2600. [

Thereafter, in the wireless charging system according to the present invention, the step of measuring the degree of deterioration of the Q value of the transmitting apparatus according to at least one receiving apparatus different from the reference receiving apparatus may be performed on the transmitting apparatus S2520).

The at least one receiving device may be a receiving device having different capabilities. In this case, the present invention can determine the degree of deterioration of the Q value of the transmitting apparatus at the first and second positions with respect to each of the at least one receiving apparatus. For example, the present invention can detect the degree of deterioration of six Q values for three receiving apparatuses.

Thereafter, according to the present invention, by using the Q value having the worst deterioration degree among the deterioration degree of the at least one Q value and the Q value having the greatest deterioration degree among the deterioration degree of the Q value in the reference receiving apparatus, The specification may be set (S2530).

The transmitting apparatus of the present invention can determine the presence or absence of an external substance according to the deterioration degree of the Q value. In the meantime, by limiting the degree of deterioration of the Q value, the present invention distinguishes the external device from the receiving device in consideration of the deterioration degree of the Q value due to the metal component of the receiving device itself, have.

More specifically, the present invention can detect the largest value of the degree of deterioration of the Q value in the at least one receiving apparatus. Thereafter, according to the present invention, a limit value of the Q value of the transmitting apparatus is set to be larger than a predetermined reference value so that the difference between the deterioration degree of the Q value in the reference receiving apparatus and the Q value when the deterioration degree of the Q value is the smallest Can be set.

Here, the predetermined reference value may be associated with at least one of the external material detection resolution of the transmitting apparatus, the measurement error of the transmitting apparatus, and the intensity of the foreign matter detection.

More specifically, the limit value of the Q value may be a value that satisfies the following equation (3).

: 기준 수신장치에서의 Q값,

: 외부 물질 중 Q값의 열화정도가 가장 작은 Q값,

: 기 설정된 기준 값)(

: The Q value at the reference receiver,

: Q value with the lowest degree of deterioration of Q value among external substances,

: Preset reference value)

That is, the limit value of the Q value of the transmitting apparatus can be set within a range satisfying the above-described expression (3). Here, the specification of the transmitting apparatus may mean the type, performance, limit value of measurable Q value, etc. included in the transmitting apparatus.

The wireless power transmission apparatus and the control method thereof according to the embodiments of the present invention can provide a transmission apparatus with higher accuracy by using a transmission apparatus having a limited deterioration degree of the Q value when determining the presence or absence of an external metallic material .

The wireless power transmission apparatus and the control method thereof according to the embodiments of the present invention can reduce the deterioration degree of the Q value in the reception apparatus and the transmission apparatus according to the WPC standard, Can be increased.

The method described above can be implemented in a recording medium that can be read by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the methods described so far can be applied to various types of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays microprocessors, microprocessors, and other electronic units for performing other functions. For example, the methods may be implemented using the wireless Or may be implemented in the control unit 180 or the power transmission control unit 112 of the power transmission apparatus 100. [

According to a software implementation, embodiments such as the procedures and functions described herein may be implemented with separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 150 of the wireless power transmission apparatus 100 and can be executed by the control unit 180 or the power transmission control unit 112. [

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.

100: wireless power transmission apparatus 200: wireless power receiving apparatus
111: power conversion unit 112: power transmission control unit
190: Power supply

Claims (15)

A control method of a wireless power transmission apparatus for wirelessly transmitting power,
Measuring the degree of deterioration of the Q value of the reference transmission apparatus;
Measuring the degree of deterioration of the Q value of the reference transmission apparatus after positioning at least one reception apparatus on the reference transmission apparatus;
Detecting a Q value with the lowest degree of deterioration among the degree of deterioration of the Q value for each of the at least one receiving apparatus and
And setting a limit value of the Q value using the Q value having the smallest degree of deterioration,
Determining the suitability of the wireless power transmission apparatus by using the limit value of the set Q value,
Wherein the limit value of the Q value is set in consideration of a Q value (Q _Tx-self ) of the transmitting apparatus itself and a Q value (Q _{W / FO} ) of the transmitting apparatus when the receiving apparatus is present. A method of controlling a power transmission device. The method according to claim 1,
The limit value of the Q value is
Gt; (a) < / RTI >
[Mathematical expression a]
Q _threshold = (Q _{Tx - self} + Q _{W / FO} ) / 2 The method according to claim 1,
The step of measuring the degree of deterioration of the Q value of the reference transmitting apparatus by the at least one receiving apparatus
Positioning one of the at least one receiving apparatus in a first position and measuring a first value indicative of a degree of deterioration of the Q value at the first position;
Further comprising the step of: placing any one of the receiving apparatuses in a second position and measuring a second value indicating a degree of deterioration of the Q value at the second position. The method of claim 3,
The step of measuring the degree of deterioration of the Q value of the reference transmitting apparatus by the at least one receiving apparatus
Detecting a first value and a second value sequentially for the at least one receiving apparatus,
Wherein a limit value of Q is set using the largest one of the first and second values detected by each of the at least one receiving apparatuses. 5. The method of claim 4,
Measuring a first and a second value, which are degree of deterioration of a Q value at the first and second positions, with respect to a receiving apparatus that is not the at least one receiving apparatus after setting a limit value of the Q value;
And comparing the first and second values with a limit value of the Q based on a smaller one of the first and second values. A control method of a wireless power transmission apparatus capable of receiving power wirelessly,
Measuring a degree of deterioration of the Q value in the wireless power transmission apparatus when the reference reception apparatus is on the wireless power transmission apparatus for a wireless power transmission apparatus capable of wirelessly transmitting power;
Measuring, for the wireless power transmission apparatus, the degree of deterioration of the Q value at the wireless power transmission apparatus when at least one receiving apparatus other than the reference receiving apparatus is on the wireless power transmission apparatus;
Setting a specification of the wireless power transmission apparatus by using a Q value having the smallest deterioration degree among the degree of deterioration of the Q value for the at least one receiving apparatus and a Q value at the reference receiving apparatus,
Determining the suitability of the wireless power transmission apparatus by using the limit value of the set Q value,
Wherein the limit value of the Q value is set in consideration of a Q value (Q _Tx-self ) of the transmitting apparatus itself and a Q value (Q _{W / FO} ) of the transmitting apparatus when the receiving apparatus is present Control method. The method according to claim 6,
The step of measuring the degree of deterioration of the Q value of the reference receiver
Measuring a degree of deterioration of the Q value when the reference receiving apparatus is in the first position;
Measuring the degree of deterioration of the Q value when the receiver is in the second position; and
And detecting a Q value having a smaller value of the degree of deterioration of the Q value at the first and second positions. 8. The method of claim 7,
Measuring the degree of deterioration of the Q value for the at least one receiving device
Measuring a degree of deterioration of the Q value when the at least one receiving device is in the first position;
Measuring the degree of deterioration of the Q value when the at least one receiving device is in the second position; and
Detecting a Q value having a largest value among deterioration degree of the Q value at the first and second positions. 9. The method of claim 8,
Further comprising the step of setting a specification of the wireless power transmission apparatus by using the difference between the Q value detected for the reference receiving apparatus and the Q value detected at the at least one receiving apparatus . 10. The method of claim 9,
The suitability of the wireless power transmission device
When the difference value of the Q value is larger than a preset value related to at least one of resolution, measurement error and intensity of the wireless power transmission apparatus. A wireless charging system capable of transmitting and receiving wireless power,
A transmitting device configured to transmit wireless power and
A receiver configured to receive wireless power,
The transmitting apparatus
Measuring the degree of deterioration of the Q value of the reference transmission apparatus;
Measuring the degree of deterioration of the Q value of the reference transmission apparatus after positioning at least one reception apparatus on the reference transmission apparatus;
Detecting a Q value with the lowest degree of deterioration among the degree of deterioration of the Q value for each of the at least one receiving apparatus and
And setting a limit value of the Q value using the Q value having the smallest degree of deterioration,
Judges suitability of the transmitting apparatus by using the threshold value of the set Q value,
Wherein the limit value of the Q value is set in consideration of a Q value (Q _Tx-self ) of the transmitting apparatus itself and a Q value (Q _{W / FO} ) of the transmitting apparatus when the receiving apparatus is present. Charging system. 12. The method of claim 11,
The limit value of the Q value is
Is defined as: " (a) "
[Mathematical expression a]
Q _threshold = (Q _{Tx - self} + Q _{W / FO} ) / 2 12. The method of claim 11,
The step of measuring the degree of deterioration of the Q value of the reference transmitting apparatus by the at least one receiving apparatus
Positioning one of the at least one receiving apparatus in a first position and measuring a first value indicative of a degree of deterioration of the Q value at the first position;
Further comprising the step of positioning the one of the receiving devices in a second position and measuring a second value indicative of the degree of deterioration of the Q value at the second location. A wireless charging system capable of transmitting and receiving wireless power,
A transmitting device configured to transmit wireless power and
A receiver configured to receive wireless power,
The transmitting apparatus
Measuring a degree of deterioration of a Q value of a reference reception apparatus for a transmission apparatus capable of wirelessly transmitting power;
Measuring a degree of deterioration of the Q value with respect to the transmitting apparatus, with respect to at least one receiving apparatus other than the reference receiving apparatus; And
Setting a specification of a transmitting apparatus using a Q value having a smallest deterioration degree among the degree of deterioration of the Q value for the at least one receiving apparatus and a Q value at the reference receiving apparatus,
Judges suitability of the transmitting apparatus by using the threshold value of the set Q value,
Wherein the limit value of the Q value is set in consideration of a Q value (Q _Tx-self ) of the transmitting apparatus itself and a Q value (Q _{W / FO} ) of the transmitting apparatus when the receiving apparatus is present. 15. The method of claim 14,
The limit value of the Q value is
A measurement error, and a strength of the transmission apparatus.

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