KR20140123811A - WIRELESS POWER TRANSMITTING APPARATUS, WIRELESS CHARGING SYSTEM and CONTROL METHOD THEREOF - Google Patents

Abstract

A wireless power transmitting device according to an embodiment of the present invention comprises: a coil unit which is formed to transmit wireless power; and a control unit which is formed to adjust a current supplied to the coil unit if a signal detected by the coil unit is out of a predetermined inductance or impedance range when an external material is introduced into the space wherein an interlinkage flux is formed by the coil unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission / reception device, a wireless charging system, and a control method of a wireless charging system.

Embodiments of the invention relate to wireless power transmission. More particularly, to the operation of a wireless charging system when an external material flows into a space where a flux linkage is formed.

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

The Wireless Power Consortium, which deals with techniques for wireless power transmission of a self-induction type, is entitled " Wireless Power Transmission System Manual, Volume I, " on April 12, 2010 for interoperability in wireless power transmission, Low Power, Part 1: Interface Definition, Version 1.00 RC1 (System Description Wireless Power Transfer, Volume 1, Low Power, Part 1: Interface Definition, Version 1.00 Release Candidate 1) 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 charging system capable of maintaining efficiency and performance when an external material flows into a space in which a flux cylinder is formed.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including a coil portion formed to transmit wireless power and a coil portion formed in a space formed by the coil portion, And a control unit configured to control a current supplied to the coil part when a signal sensed from the coil part is out of a preset inductance or impedance range when the material enters.

According to an example of the present invention, the wireless power transmission apparatus may further include a sensing unit configured to sense an inductance or an impedance change of a transmission coil provided in the coil unit.

According to an example of the present invention, the controller may block the current supplied to the transmission coil in the charging ready state before the wireless power is transmitted, and measure the inductance or impedance of the transmission coil through the sensing unit have.

According to an example of the present invention, the controller may supply a small amount of current to the transmission coil in a state ready for charging before radio power is transmitted, and measure the inductance or impedance of the transmission coil through the sensing unit have.

According to an example of the present invention, the control unit measures the inductance or impedance of the transmission coil through the sensing unit while interrupting the current supplied to the transmission coil at a predetermined period in a charging state in which wireless power is transmitted .

According to an example of the present invention, the controller may measure an inductance or an impedance of the transmission coil through the sensing unit while supplying a small amount of current to the transmission coil at regular intervals in a charging state in which wireless power is transmitted have.

According to one embodiment of the present invention, the wireless power transmission apparatus further includes an alarm unit for outputting a signal for notifying the occurrence of an event, and the control unit controls the current supplied to the coil unit, A signal can be output.

In order to achieve the above object, another embodiment of the present invention is directed to a wireless communication system including a transmission device having a first coil part and configured to transmit wireless power, and a second coil part, A signal received from any one of the coil sections when the external material enters the space in which the coil fluxes are formed by the coil sections and is embedded in the transmitting apparatus or the receiving apparatus, And a control unit configured to adjust a current supplied to the first coil unit when the inductance or the impedance is out of the range.

According to an example of the present invention, the transmission apparatus or the reception apparatus may further include a sensing unit configured to sense an inductance or an impedance change of the coil.

According to an example of the present invention, the control unit may block a current supplied to the transmission coil of the first coil part in a charging ready state before the radio power is transmitted, and transmit the inductance of the transmission coil through the sensing unit Impedance can be measured.

According to an example of the present invention, the control unit supplies a small amount of current to the transmission coil of the first coil part in the charge preparation state before the radio power is transmitted, and controls the inductance of the transmission coil Impedance can be measured.

According to an example of the present invention, the control unit may control the current supplied to the transmission coil of the first coil part at a predetermined cycle while the wireless power is being transmitted, I can measure the impedance.

According to an example of the present invention, the controller may measure an inductance or an impedance of the transmission coil through the sensing unit while supplying a small amount of current to the transmission coil at regular intervals in a charging state in which wireless power is transmitted have.

In order to achieve the above-mentioned object, another embodiment of the present invention is a charging method for charging a battery, comprising: a waiting step of receiving a signal for switching from a charging ready state to a charging state; A measuring step of measuring an inductance or an impedance of a transmission coil or a receiving coil through a sensing part while supplying a small amount of current to the transmission coil and a comparison step of comparing whether the measured value of the inductance or the impedance is within a predetermined range, And a control step of switching to a charging state in which a current is supplied to the transmission coil so that a radio power is transmitted if the current is not out of a preset range, A control method of a charging system is disclosed.

According to an example of the present invention, the controlling step may further include an output step of outputting a signal for notifying an occurrence of an event to the alarm unit when the measured inductance or impedance value is out of a preset range.

According to another aspect of the present invention, in order to realize the above-mentioned object, the present invention is characterized in that a current supplied to the transmission coil is cut off or a small amount of current is supplied to the transmission coil at a predetermined cycle in the charging state, A measurement step of measuring an inductance or an impedance of the transmission coil and a comparison of whether the measured value of the inductance or the impedance is within a preset range. If the measured inductance or impedance is out of a preset range, And a control step of maintaining a charging state of supplying current to the transmission coil so that the radio power is transmitted if the transmission power does not deviate from the predetermined range.

According to an example of the present invention, the controlling step may further include an output step of outputting a signal for notifying an occurrence of an event to the alarm unit when the measured inductance or impedance value is out of a preset range.

The wireless power transmitting / receiving device, the wireless charging system, and the control method of the wireless charging system according to at least one embodiment of the present invention configured as described above, when the signal sensed from the coil part is out of a preset inductance or impedance range, By adjusting the supplied current, it is possible to prevent the efficiency and performance of the wireless charging system from being degraded or the external material to be heated by the flux linkage even if the external material is disposed in the space where the flux linkage is formed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary diagram conceptually illustrating a wireless power transmission device and an electronic device according to embodiments of the present invention; FIG.
2 (a) and 2 (b) are block diagrams illustrating exemplary configurations of a wireless power transmission apparatus 100 and an electronic device 200 that can be employed in the embodiments disclosed herein, respectively.
FIG. 3 illustrates a concept that power is transmitted from a wireless power transmission device to an electronic device wirelessly according to an inductive coupling scheme.
4 is a block diagram exemplarily showing a part of the configuration of the electronic apparatus 200 and the electromagnetic induction type wireless power transmission apparatus 100 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 is a conceptual diagram illustrating a concept that power is transmitted from a wireless power transmission device to an electronic device wirelessly according to a resonant coupling scheme;
7 is a block diagram exemplarily showing a part of the configuration of the electronic apparatus 200 and the wireless power transmission apparatus 100 of the resonance type 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 is a diagram showing a configuration in a case where the electronic device 200 according to the embodiments disclosed herein is implemented in the form of a mobile terminal.
11 is a front perspective view of a charger according to one embodiment of the present invention.
12 is a front perspective view of a mobile terminal according to an embodiment of the present invention.
13 is a rear perspective view of the mobile terminal shown in Fig.
FIG. 14A is a conceptual diagram of a wireless charging system according to an embodiment of the present invention, and FIG. 14B is a diagram illustrating an example in which an external material flows into a space where a flux linkage is formed. FIG.
15 is a block diagram of a wireless charging system in accordance with an embodiment of the present invention.
16 shows changes in inductance according to the magnitude of the current supplied to the load and the alignment state between the wireless power transmission device and the wireless power reception device in the case where there is no external material in the space where the flux linkage is formed and in the case where there is external material A drawing.
17 is a graph showing changes in impedance according to the magnitude of the current supplied to the load and the alignment state between the wireless power transmission device and the wireless power reception device in the case where there is no external material in the space where the flux- A drawing.
18 shows changes in inductance according to the magnitude of the current supplied to the load and the alignment state between the wireless power transmission device and the wireless power reception device.
19 is a flowchart showing an example of a control method of a wireless charging system in a charging preparation state.
20 is a flowchart showing an example of a control method of a wireless charging system in a charged state.

The techniques disclosed herein apply to contactless power transfer. 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 scope of the technology disclosed herein. Also, the technical terms used herein should be interpreted as being generally understood by those skilled in the art to which the presently disclosed subject matter belongs, unless the context clearly dictates otherwise in this specification, Should not be construed in a broader sense, or interpreted in an oversimplified sense. In addition, when a technical term used in this specification is an erroneous technical term that does not accurately express the concept of the technology disclosed in this specification, it should be understood that technical terms which can be understood by a person skilled in the art are replaced. Also, the general terms used in the present specification should be interpreted in accordance with the predefined or prior context, and should not be construed as being excessively reduced in meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising "and 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.

Further, the suffix "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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals denote like or similar elements, and redundant description thereof will be omitted.

Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured. It is to be noted that the attached drawings are only for the purpose of easily understanding the concept of the technology disclosed in the present specification, and should not be construed as limiting the spirit of the technology by the attached drawings.

Figure 1 - Wireless power transmission device and electronic device conceptual diagram

1 is an exemplary diagram conceptually showing a wireless power transmission apparatus and an electronic apparatus according to the embodiments disclosed herein.

1, the wireless power transmission apparatus 100 may be a power transmission apparatus that wirelessly transmits power required for the electronic apparatus 200 (or wireless power receiving apparatus).

In addition, the wireless power transmission apparatus 100 may be a wireless charging apparatus that charges the battery of the electronic device 200 by transmitting power wirelessly. An embodiment implemented by the wireless power transmission apparatus 100 will be described below with reference to FIG.

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

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

On the other hand, the electronic apparatus for receiving power wirelessly described in the present specification can be applied to any portable electronic apparatus such as an input / output apparatus such as a keyboard, a mouse, an auxiliary output apparatus for video or audio, a cellular phone, a cellular phone, smart phone, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), tablet, or multimedia device.

The electronic device 200 may be a mobile communication terminal (e.g., a cellular phone, a cellular phone, a tablet) or a multimedia device, as will be described later. An embodiment in which the electronic device 200 is implemented as a mobile terminal will be described below with reference to FIG.

Meanwhile, the wireless power transmission apparatus 100 may use one or more wireless power transmission methods to wirelessly transmit power to the electronic device 200 without mutual contact. That is, the wireless power transmission apparatus 100 includes an inductive coupling scheme based on an electromagnetic induction phenomenon generated by the wireless power signal, a resonant coupling scheme based on an electromagnetic resonance phenomenon generated by a wireless power signal of a specific frequency, (Electromagnetic Resonance Coupling) method.

The inductively coupled wireless power transmission is a technique for wirelessly transmitting power using a primary coil and a secondary coil. The current is transmitted to the other coil by a varying magnetic field generated by electromagnetic induction in one coil. And the electric power is transmitted.

In the wireless power transmission according to the resonant coupling scheme, electromagnetic resonance occurs in the electronic device 200 by a wireless power signal transmitted from the wireless power transmission apparatus 100, and the wireless power transmission Refers to the transmission of electric power from the device 100 to the electronic device 200.

Hereinafter, embodiments related to the wireless power transmission apparatus 100 and the electronic apparatus 200 disclosed in this specification will be described in detail. The same reference numerals as possible are used for the same elements in the following drawings even though they are shown in different drawings.

2 is a block diagram exemplarily illustrating a configuration of a wireless power transmission apparatus 100 and an electronic device 200 that can be employed in the embodiments disclosed herein.

Figure 2A - Wireless power transfer 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 electronic device 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.

In some embodiments, the power conversion unit 111 may be configured to include a primary coil that forms a varying magnetic field to induce a current in the secondary coil of the electronic device 200 according to an inductive coupling scheme . In some embodiments, the power conversion unit 111 includes a coil (or antenna) that forms a magnetic field having a specific resonance frequency to generate a resonance phenomenon in the electronic device 200 according to a resonance coupling scheme. .

Also, in some embodiments, the power conversion unit 111 may transmit power using one or more of the above-described inductive coupling method and resonant coupling method.

Referring to FIGS. 4A, 4B, and 5, those of the components included in the power conversion unit 111 that follow the inductive coupling scheme will be described with reference to FIGS. 7A, 7B, and 8 Will be described later.

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. In some embodiments, the power transmission control 112 may be implemented to be integrated with another control (not shown) that controls the wireless power supply 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 electronic device 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 electronic device 200. [ Here, the power transmission control unit 112 may detect whether the electronic device 200 is placed in or removed from the active area or the sensing area. Specifically, the power transmission control unit 112 determines whether the electronic device 200 is located in the active area or the sensing area by using a wireless power signal formed in the power conversion unit 111 or a sensor provided separately Or not. For example, the power transmission control unit 112 receives the wireless power signal due to the electronic device 200 existing in the sensing area, and controls the power for the wireless power signal of the power conversion unit 111 The presence of the electronic device 200 can be detected by monitoring whether or not the characteristics of the electronic device 200 change. 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 electronic device 200 or may determine whether to start the wireless power transmission according to a result of detecting the presence of the electronic device 200.

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 of the electronic device 200 side. In some embodiments, the power transmission control unit 112 may determine the characteristics based on the device identification information of the electronic device 200. [ In some embodiments, the power transmission control unit 112 can determine the characteristics based on the requested power information of the electronic device 200 or the profile information of the requested power. The power transmission control unit 112 may receive a power control message from the electronic device 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 be used to 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 electronic device 200 One or more characteristics of the frequency, current, and voltage can be determined.

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 may receive information to be audibly or visually output related to the electronic device 200 through the power control message, or may receive information necessary for authentication between devices .

In some embodiments, the power transmission control unit 112 may receive the power control message through the wireless power signal. In some embodiments, the power transmission control unit 112 may receive the power control message through a method of receiving 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 electronic device 200 and receive the power control message. A method for the power conversion unit 111 to receive the power control message using the wireless power signal will be described below with reference to FIGS. 11A to 13.

In addition, the power transmission control unit 112 may acquire a power control message by receiving user data including a power control message by communication means (not shown) included in the wireless power transmission apparatus 100 have.

According to one embodiment disclosed herein, the wireless power transmission apparatus 100 can supply power to a plurality of electronic devices (or wireless power receiving apparatuses). In this case, the wireless power signals modulated by the plurality of electronic devices may collide. Accordingly, the components included in the wireless power transmission apparatus 100 can perform various operations to avoid collision of the modulated wireless power signals.

According to an embodiment, the power conversion unit 111 may convert the power supplied from the transmission power supply unit 190 to a wireless power signal and transmit the wireless power signal to a plurality of electronic devices . For example, the plurality of electronic devices may be a first electronic device and a second electronic device, which are two electronic devices.

The power conversion unit 111 may form a wireless power signal for power transmission, and may receive a first response signal and a second response signal corresponding to the wireless power signal.

The power transmission control unit 112 determines whether or not the first response signal and the second response signal are in conflict, and when the first response signal and the second response signal collide based on the determination result, Can be reset.

The first response signal and the second response signal may be generated by modulating the wireless power signal by the first device and the second device, respectively.

Also, the power transmission control unit 112 may control the power conversion unit 111 so that the first response signal and the second response signal, which are formed so as not to be collided with each other, are sequentially received as a result of the power transmission reset.

Wherein the sequentially receiving may be to receive the first response signal after a first time interval within a predetermined response period and receive the second response signal after a second time interval, The second time interval may be determined based on a value generated by generating a random number.

The predetermined Tping interval may be determined after a time that may include both the first response signal and the second response signal, and may be determined after the power transmission is reset.

According to an embodiment, the determination of whether or not the collision occurs may be made according to whether the first response signal and the second response signal are decoded using a predetermined format, and the predetermined format is a preamble, a header And determining whether or not the first response signal and the second response signal are collided by at least one of the preamble, the header, and the message, 2 < / RTI > response signal can not be restored.

Also, according to an embodiment, the power converter 111 periodically receives a response signal of the first device which does not collide with the response signal of the second device within a first response period (Tping interval_1) The power transmission control unit decodes the first response signal and the second response signal using a predetermined format and determines whether or not a collision of the first response signal and the second response signal occurs based on whether or not the decoding is performed . ≪ / RTI > Here, the first response signal and the second response signal are periodically received within a second response period (Tping interval_2), and the second response period (Tping interval_2) includes both the first response signal and the second response signal And may be determined after resetting the power transmission.

Figure 2B -

Referring to FIG. 2B, the electronic device 200 is configured to include a power supply unit 290. The power supply unit 290 supplies power required for the operation of the electronic device 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, in some embodiments, the power receiving unit 291 may include a secondary coil through which a current is induced by a magnetic field that varies as a component according to an inductive coupling scheme. Further, in some embodiments, the power receiving unit 291 may include a coil and a resonance forming circuit that generate a resonance phenomenon by a magnetic field having a specific resonance frequency as a component according to a resonance coupling scheme.

However, in some embodiments, the power receiver 291 may receive power according to one or more wireless power transfer schemes. In this case, the power receiver 291 may be configured to receive using one coil, May be implemented to receive using a coil formed differently depending on the power transmission scheme.

Embodiments according to the inductive coupling scheme among the components included in the power receiving unit 291 will be described with reference to FIGS. 4A and 4B, and embodiments according to the resonant coupling scheme will be described later with reference to FIG. 7A or FIG. 7B .

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 some embodiments, the power reception control unit 292 may transmit the power control message through the wireless power signal. Also, in some embodiments, the power control unit 292 may transmit the power control message through a method of transmitting through the user data.

In order to transmit the power control message, the electronic device 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 method in which the modulation and demodulation units 113 and 293 on the side of the wireless power transmission apparatus 100 and the side of the electronic device 200 are used for transmission and reception of a power control message through a wireless power signal will be described.

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 electronic device 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 may 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. A specific method by which the wireless power transmission apparatus 100 acquires the power control message will be described later with reference to FIGS. 11A to 13.

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

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

The electronic 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 to operate the battery 299 The battery 299 can be operated by the electric power charged in the battery 299. At this time, the power receiving control unit 292 may control the charging unit 298 to perform charging using the transmitted power.

According to the embodiment disclosed herein, a plurality of electronic apparatuses can receive power from the wireless power transmission apparatus 100. In this case, the wireless power signals modulated by the plurality of electronic devices may collide. Therefore, the components included in the electronic device 200 can perform various operations to avoid collision of the modulated wireless power signals.

According to one embodiment, the power receiver 291 may receive a wireless power signal for power transmission from the wireless power transmission device.

In this case, the power reception control unit 292 controls the power reception unit 291 to transmit the third response signal corresponding to the wireless power signal after a time interval set to the first time within the first response period (Tping interval_1) Can be controlled.

According to one embodiment, the power reception control unit 292 determines whether power transmission of the wireless power transmission apparatus 100 has been reset due to the collision of the modulated wireless power signals, and based on the determination result, When the power transmission is reset, the time interval may be set to a second time.

According to an embodiment, the power reception controller 292 may set the fourth response signal corresponding to the wireless power signal to the power reception unit 291 at the second time within the second response period Tping interval_2 And the second time may be determined based on the value generated by generating the random number.

Hereinafter, a wireless power transmission apparatus and an electronic apparatus applicable to the embodiments disclosed herein will be described.

3 to 5, a method of transmitting power to the electronic apparatus by the wireless power transmission apparatus is disclosed according to embodiments that support the inductive coupling scheme.

3 - Inductively Coupled

Figure 3 illustrates the concept that power is transferred from a wireless power transmission device to an electronic device wirelessly in accordance with embodiments that support 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 electronic device 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. Also, the power receiving unit 291 of the electronic device 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 electronic apparatus 200 are arranged so that the transmission coil 1111a on the wireless power transmission apparatus 100 side and the reception coil on the electronic apparatus 200 side are close to each other. When the power transmission control unit 112 controls the current of the transmission coil 1111a to be changed, the power receiving unit 291 transmits the power to the electronic device 200 using the electromotive force induced in the receiving coil 2911a. As shown in FIG.

The efficiency of the wireless power transmission by the inductively coupled system has a small influence on the frequency characteristics but is influenced by the alignment and distance between the wireless power transmission apparatus 100 including the coils and the electronic apparatus 200, (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 electronic devices may be placed on the interface surface, and the transmission coil 1111a may be mounted on the interface surface. 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 electronic device 200 located above the interface surface is small, Is sufficiently small so that wireless power transmission by the inductive coupling scheme can be efficiently performed.

In addition, an arrangement indicator (not shown) may be formed on an upper surface of the interface to indicate a position where the electronic device 200 is to be placed. The arrangement instruction unit indicates a position of the electronic device 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 made suitable. In some embodiments, the arrangement indicator may be a simple mark. In some embodiments, the arrangement indication portion may be formed in the form of a protruding structure for guiding the position of the electronic device 200. Also, in some embodiments, the arrangement directing part is formed in the form of a magnetic body such as a magnet mounted on the lower part of the interface surface, and by the mutual attractive force with other magnetic bodies mounted inside the electronic device 200, May be guided to form an appropriate arrangement.

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 appropriately arranged with the reception coil 2911a of the electronic device 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 inductive coupling type wireless power transmission apparatus and an electronic apparatus applicable to the embodiments disclosed herein will be described in detail.

4A and 4B - Inductively coupled wireless power transmission device and electronic device

4A and 4B are block diagrams exemplarily showing a part of the configuration of the electronic apparatus 200 and the electromagnetic induction type wireless power transmission apparatus 100 that can be employed in the embodiments disclosed herein. Referring to FIG. 4A, the configuration of the power transfer unit 110 included in the wireless power transmission apparatus 100 will be described, and the power supply unit 290 included in the electronic device 200 will be described with reference to FIG. 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. In some embodiments, the transmission coil 1111a may be implemented as a planar spiral type. Also, in some embodiments, the transmission coil 1111a may be implemented as 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 method is performed by the arrangement and distance between the wireless power transmission apparatus 100 including the primary and secondary coils and the electronic apparatus 200, . Particularly, the positioning unit 1114 can be used when the electronic device 200 is not present in the active area of the wireless power transmission apparatus 100.

Therefore, the positioning unit 1114 may determine that the distance between the center of the transmission coil 1111a of the wireless power transmission device 100 and the reception coil 2911a of the electronic device 200 is within a certain range And a driving unit (not shown) for moving the transmission coil 1111a so that the center of the transmission coil 1111a and the reception coil 2911a overlap with each other or rotating the transmission coil 1111a so as to overlap the center of the transmission coil 1111a and the reception coil 2911a .

For this, the wireless power transmission apparatus 100 may further include a position detection unit (not shown) configured to detect a position of the electronic device 200, and the power transmission control unit 112 May control the positioning unit 1114 based on positional information of the electronic device 200 received from the position sensor.

To this end, the power transmission control unit 112 receives control information on the arrangement or distance with the electronic device 200 through the modulation / demodulation unit 113, and based on the received control information on the arrangement or distance, The positioning unit 1114 can be controlled.

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

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

Referring to FIG. 4B, the power supply unit 290 of the electronic device 200 may be configured to include a reception coil (Rx coil) 2911a and a rectification 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 embodiment of the receiving coil 2911a may be in the form of a flat spiral or a cylindrical solenoid, according to embodiments 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 that makes 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 electronic device 200 monitors the voltage and / or current of the power source rectified by the rectifying circuit 2913, and if the voltage and / or current of the rectified power source If the threshold value is exceeded, the power reception control unit 292 transmits a power control message to the wireless power transmission apparatus 100 to transmit appropriate power.

Figure 5 - A wireless power transmission apparatus comprising 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 electronic device 200 located on the interface surface is sensed, the power transmission control unit 112 controls the power of the one or more transmission coils 1111a-1 to 1111a-1, considering the sensed position of the electronic device 200. [ 1111a-n may be connected to the receiving coil 2911a of the electronic device 200. In this case,

For this, the power transmission control unit 112 may acquire position information of the electronic device 200. In some embodiments, the power transmission control unit 112 can acquire the position of the electronic device 200 on the interface surface by the position sensing unit (not shown) provided in the wireless power transmission device 100 have. In yet other embodiments, the power transmission control unit 112 uses a power control message indicating the strength of the wireless power signal from an object on the interface surface using the one or more transmission coils 1111a-1 to 1111a-n, respectively, The position information of the electronic device 200 can be obtained by receiving a power control message indicating the 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 have.

On the other hand, the active area may be a part of the interface surface, and may refer to a portion where a high efficiency magnetic field can pass when the wireless power transmission apparatus 100 transmits power wirelessly to the electronic device 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. Accordingly, the power transmission control unit 112 determines an activity area based on the sensed position of the electronic device 200, establishes connection of major cells corresponding to the active area, The multiplexer 1113 can be controlled so that the coil 2911a and the coils belonging to the main cell can be placed in an inductive coupling relationship.

On the other hand, when one or more electronic devices 200 are disposed on the interface surface of the wireless power transmission apparatus 100 configured to include the one or more transmission coils 1111a-1 to 1111a-n, the power transmission control unit 112 may control the multiplexer 1113 such that the coils belonging to the main cell corresponding to the position of each electronic device are in an inductive coupling relationship. Accordingly, the wireless power transmission apparatus 100 can wirelessly transmit power to one or more electronic devices by forming wireless power signals using different coils.

Also, the power transmission control unit 112 may be configured to supply power having different characteristics to the coils corresponding to the electronic apparatuses. In this case, the wireless power transmission apparatus 100 can transmit power by setting a different power transmission mode, efficiency, and characteristics for each electronic device. Power delivery for one or more electronic devices is described below with reference to FIG.

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

Hereinafter, a method of transmitting power by a wireless power transmission apparatus in accordance with embodiments that support a resonant coupling scheme is described with reference to FIGS.

Figure 6 - Resonance coupling method

Figure 6 illustrates the concept that power is transmitted from a wireless power transmission device to an electronic device wirelessly according to embodiments that support the 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 electronic device 200 due to the magnetic field, power is generated in the electronic device 200 by the resonance phenomenon.

As described above, when the plurality of vibrating bodies are electromagnetically mutually resonated, power transmission efficiency can be very high because they are not affected by surrounding objects other than the plurality of vibrating bodies. An energy tunnel may occur between the plurality of vibrating bodies that are mutually resonated by electromagnetic waves. This is sometimes referred to as energy coupling or energy tail.

In the resonance coupling method disclosed in this specification, an electromagnetic wave having a low frequency can be used. When electric power is transmitted using an electromagnetic wave having a low frequency, only a magnetic field affects a region located within a single wavelength of the electromagnetic wave do. This can be called magnetic coupling or magnetic resonance. This magnetic resonance can be generated when the wireless power transmission apparatus 100 and the electronic apparatus 200 are positioned within a single wavelength of the electromagnetic wave having the low frequency.

In this case, the energy tail due to the resonance phenomenon is formed, and the form of power transmission becomes non-radiative. For this reason, a radiative problem, which may be caused by transmission of electric power by using electromagnetic waves, can be solved.

The resonance coupling method may be a method of transmitting electric power using an electromagnetic wave having a low frequency as described above. Therefore, in principle, the transmission coil 1111b of the wireless power transmission apparatus 100 can form a magnetic field or an electromagnetic wave for transmitting electric power. Hereinafter, the resonance coupling method will be described in terms of magnetic resonance, Will be described in terms of power delivery.

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. And a capacitive resonance forming circuit may be connected to the coil to determine the resonance frequency.

Referring to FIG. 6, in the embodiments in which power is transmitted wirelessly according to the resonant coupling scheme, the power conversion unit 111 of the wireless power transmission apparatus 100 includes a transmission coil Tx coil And a resonance forming circuit 1116 connected to the transmission coil 1111b and for determining a specific oscillation frequency. The resonance forming circuit 1116 may 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 resonance forming circuit 1116 .

The configuration of the circuit elements of the resonance forming circuit 1116 may be variously configured to form a magnetic field by the power converting unit 111 and may be formed in a form that is connected in parallel with the transmission coil 1111b .

The power receiving unit 291 of the electronic device 200 includes a resonance forming circuit 2912 and a receiving coil Rx coil 2912. The resonance forming circuit 2912 is configured to generate a resonance phenomenon by a magnetic field formed in the wireless power transmission apparatus 100 2911b. That is, the resonance forming circuit 2912 may be implemented using a capacitive circuit, and the resonance forming circuit 2912 may be formed based on the inductance of the receiving coil 2911b and the capacitance of the resonance forming circuit 2912 Is equal to the resonance frequency of the formed magnetic field.

 The configuration of the circuit elements of the resonance forming circuit 2912 may be variously configured so that the power receiving unit 291 may resonate with the magnetic field, and may be connected in series with the receiving coil 2911b But are 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 electronic device 200 when the result of substituting LRX and CRX of the electronic device 200 into Equation 1 is equal to the specific vibration frequency.

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

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

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

7A and 7B - Resonance-coupled wireless power transmission apparatus

7A and 7B are block diagrams exemplarily showing a part of the configuration of the electronic apparatus 200 and the wireless power transmission apparatus 100 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 section 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111b, an inverter 1112, and a resonance forming circuit 1116. [ The inverter 1112 may be configured to be connected to the transmission coil 1111b and the resonance forming 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 forming circuit 1116 may be vibrated when the AC power is applied and the vibration of the transmission coil 1111b and the resonance forming circuit 1116 may be generated based on the inductance of the transmission coil 1111b and the capacitance of the resonance forming circuit 1116, The frequency can be determined.

For this purpose, the inverter 1112 transforms the 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 forming 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.

In some embodiments, the frequency adjuster 1117 may be configured to include a motor that can adjust the distance between the capacitors included in the resonant forming circuit 1116 to change the capacitance. Also, in some embodiments, the frequency adjuster 1117 may be configured to include a motor that can change the inductance by adjusting the number of turns or the diameter of the transmission coil 1111b. Also, in some embodiments, the frequency adjuster 1117 may be configured to include active elements that determine the capacitance and / or inductance.

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

The configuration of the power supply unit 290 included in the electronic device 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 forming 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.

Figure 8 - 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 embodiments that support a resonant coupling scheme.

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 include resonance forming 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. In some embodiments, a portion of the one or more transmission coils 1111b-1 through 1111b-n may be set to have different resonant frequencies, which may include one or more of the transmission coils 1111b-1 through 1111b- And the resonance forming circuits 1116-1 through 1116-n, respectively, which are connected to the resonance forming circuits 1116-1 through 1116-n, respectively, have any inductance and / or capacitance.

On the other hand, when one or more electronic devices 200 are disposed in the active area or sensing area of the wireless power transmission device 100 configured to include the one or more transmission coils 1111b-1 to 1111b-n, The control unit 112 may control the multiplexer 1113 so as to be placed in a different resonant coupling relationship with respect to each electronic device. Accordingly, the wireless power transmission apparatus 100 can wirelessly transmit power to one or more electronic devices by forming wireless power signals using different coils.

Also, the power transmission control unit 112 may be configured to supply power having different characteristics to the coils corresponding to the electronic apparatuses. In this case, the wireless power transmission apparatus 100 can transmit power by setting different power transmission modes, resonance frequencies, efficiencies, characteristics, and the like for each electronic device. Power delivery for one or more electronic devices is described below with reference to FIG.

To this end, the frequency adjuster 1117 may change the inductance and / or capacitance of the resonance forming circuits 1116-1 through 1116-n, respectively, connected to the one or more transmission coils 1111b-1 through 1111b-n . ≪ / RTI >

Figure 9 - Wireless power transfer device implemented with a charger

Meanwhile, an example of the wireless power transmission apparatus implemented in the form of a wireless charger will be described below.

9 is a block diagram illustrating a wireless power transmission apparatus that further includes an additional configuration in addition to the configuration shown in FIG. 2A.

9, the wireless power transmission apparatus 100 includes a power transmission unit 110 and a power supply unit 190 that support at least one of the inductive coupling method and the resonant coupling method described above, And may further include a sensor unit 120, a communication unit 130, an output unit 140, a memory 150, and a control unit 180.

The control unit 180 controls the power conversion unit 110, the sensor unit 120, the communication unit 130, the output unit 140, the memory 150, and the power supply unit 190.

The controller 180 may be realized as a separate module from the power transmission controller 112 in the power conversion unit 110 described with reference to FIG. 2A or 2B, or may be implemented as a single module.

The sensor unit 120 may be configured to include a sensor for sensing the position of the electronic device 200. The position information sensed by the sensor unit 120 may be used to allow the power conversion unit 110 to efficiently transmit power.

For example, in the case of wireless power transmission according to embodiments that support inductive coupling, the sensor unit 120 may operate as a position sensing unit, and the position information sensed by the sensor unit 120 may be And may be used to move or rotate the transmission coil 1111a in the power conversion unit 110. [

Further, for example, the wireless power transmission apparatus 100 according to embodiments including one or more of the above-described transmission coils may be configured to transmit, based on position information of the electronic device 200, It is possible to determine coils that can be placed in an inductive coupling relationship or a resonant coupling relationship with the receiving coils of the coil 200. [

Meanwhile, the sensor unit 120 may be configured to monitor whether the electronic device 200 is approaching a chargeable area. The accessibility detection function of the sensor unit 120 may be performed separately or in combination with the function of the power transmission control unit 112 in the power transmission unit 110 to detect whether the electronic device 200 is approaching .

The communication unit 130 performs wire / wireless data communication with the electronic device 200. The communication unit 130 may include electronic components for at least one of BluetoothTM, Zigbee, Ultra Wide Band (UWB), Wireless USB, Near Field Communication (NFC), and Wireless LAN.

The output unit 140 includes at least one of a display unit 141 and an audio output unit 142. The display unit 141 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) a flexible display, and a 3D display. The display unit 141 may display a state of charge according to the control of the controller 180.

The memory 150 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) (Random Access Memory), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM) A magnetic disk, and / or an optical disk. The wireless power transmission apparatus 100 may operate in association with a web storage that performs a storage function of the memory 150 on the Internet. The memory 150 may store programs or commands that perform the above-described functions of the wireless power transmission apparatus 100. [ The controller 180 may execute programs or commands stored in the memory 150 to transmit power wirelessly. Other components (e.g., controller 180) included in the wireless power transmission apparatus 100 may use a memory controller (not shown) to access the memory 150. [

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.

10 - a wireless power receiving device implemented as a mobile terminal

10 shows a configuration in which the electronic device 200 according to the embodiments disclosed herein is implemented in the form of a mobile terminal.

The mobile communication terminal 200 includes the power supply unit 290 shown in FIGS. 2A, 2B, 4A, 4B, 7A, and 7B.

The terminal 200 includes a wireless communication unit 210, an audio / video input unit 220, a user input unit 230, a sensing unit 240, an output unit 250, a memory 260, An interface unit 270, and a control unit 280. The components shown in Fig. 10 are not essential, and a terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 210 can perform wireless communication between the terminal 200 and the wireless communication system or between the terminal 200 and the network where the terminal 200 is located or between the terminal 200 and the wireless power transmission apparatus 100 One or more modules. For example, the wireless communication unit 210 may include a broadcast receiving module 211, a mobile communication module 212, a wireless Internet module 213, a short distance communication module 214, and a location information module 215 .

The broadcast receiving module 211 receives broadcast signals and / or broadcast-related information from an external broadcast center through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast center may be a server for generating and transmitting broadcast signals and / or broadcast-related information, or a server for receiving broadcast signals and / or broadcast-related information generated by the broadcast center and transmitting the generated broadcast signals and / or broadcast- related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 212.

The broadcast-related information may exist in various forms. For example, an EPG (Electronic Program Guide) of DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of Digital Video Broadcast-Handheld (DVB-H).

For example, the broadcast receiving module 211 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only (DVF-H) And a Digital Broadcasting System (ISDB-T) (Integrated Services Digital Broadcast-Terrestrial). Of course, the broadcast receiving module 211 may be adapted to other broadcasting systems as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 211 may be stored in the memory 260.

The mobile communication module 212 transmits and receives a radio signal to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 213 is a module for wireless Internet access, and may be built in or externally attached to the terminal 200. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short range communication module 214 is a module for short range communication. Bluetooth®, Radio Frequency Identification (RFID), Infrared Data Association (IRDA), Ultra Wideband (UWB), ZigBee®, and the like can be used as short range communication technology. Meanwhile, USB (Universal Serial Bus), IEEE 1394, Thunderbolt (TM), or the like can be used as the near-field communication of the wire.

The wireless Internet module 213 or the local area communication module 214 may establish a data communication connection with the wireless power transmission apparatus 100.

Through the established data communication, when there is an audio signal to be output while the wireless Internet module 213 or the short-range communication module 214 is transmitting power wirelessly, the audio signal is transmitted through the short- To the wireless power transmission apparatus 100. The wireless Internet module 213 or the local area communication module 214 may transmit the information to the wireless power transmission apparatus 100 through the established data communication. Alternatively, through the established data communication, the wireless Internet module 213 or the short-range communication module 214 may receive an audio signal input through a microphone built in the wireless power transmission apparatus 100. [ The wireless Internet module 213 or the local area communication module 214 may transmit identification information (e.g., a telephone number or a device name in the case of a mobile phone) of the mobile terminal 200 to the wireless power To the transmission apparatus 100.

The position information module 215 is a module for acquiring the position of the terminal, for example, a Global Position System (GPS) module.

Referring to FIG. 10, an A / V (Audio / Video) input unit 220 is for inputting an audio signal or a video signal, and may include a camera 221 and a microphone 222. The camera 221 processes an image frame such as a still image or a moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display unit 251. [

The image frame processed by the camera 221 may be stored in the memory 260 or may be transmitted to the outside via the wireless communication unit 210. [ At least two cameras 221 may be provided depending on the use environment.

The microphone 222 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data may be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 212 when the voice data is in the call mode, and output. Various noise elimination algorithms may be implemented in the microphone 222 to remove noise generated in receiving an external sound signal.

The user input unit 230 generates input data for a user to control the operation of the terminal. The user input unit 230 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The sensing unit 240 may include a proximity sensor 241, a pressure sensor 242, a motion sensor 243, and the like. The proximity sensor 241 can detect an object approaching the mobile terminal 200 or the presence of an object in the vicinity of the mobile terminal 200 without mechanical contact. The proximity sensor 241 can detect a nearby object by using the change of the alternating magnetic field or the change of the static magnetic field, or the rate of change of the capacitance. The proximity sensor 241 may include two or more sensors according to the configuration.

The pressure sensor 242 can detect whether pressure is applied to the mobile terminal 200, the magnitude of the pressure, and the like. The pressure sensor 242 may be installed at a position where the pressure of the mobile terminal 200 needs to be detected according to the use environment. If the pressure sensor 242 is installed on the display unit 251, a touch input through the display unit 251 and a pressure greater than a touch input To identify the applied pressure touch input. In addition, the magnitude of the pressure applied to the display unit 251 when the pressure touch is input can be determined according to the signal output from the pressure sensor 242.

The motion sensor 243 detects the position or movement of the mobile terminal 200 using an acceleration sensor, a gyro sensor, or the like. An acceleration sensor that can be used in the motion sensor 243 is an element that converts an acceleration change in one direction into an electric signal. Acceleration sensors are usually constructed by mounting two or three axes in one package. Depending on the usage environment, only one axis of Z axis is required. Therefore, when the acceleration sensor in the X-axis direction or the Y-axis direction is used instead of the Z-axis direction for some reason, the acceleration sensor may be mounted on the main substrate by using a separate piece substrate. In addition, the gyro sensor is a sensor for measuring the angular velocity of the mobile terminal 200, which is rotating, and can sense a rotated angle with respect to each reference direction. For example, the gyro sensor may sense azimuth, pitch and roll angles based on axes in three directions.

The output unit 250 includes a display unit 251, an audio output module 252, an alarm unit 253, a haptic module 254, and the like, for generating output related to visual, auditory, .

The display unit 251 displays (outputs) information processed by the terminal 200. [ For example, when the terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the terminal 200 is in the video communication mode or the photographing mode, the photographed and / or received image, UI, or GUI is displayed.

The display unit 251 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display unit 251 may also be of a light transmission type. With this structure, the user can see an object located behind the terminal body through the area occupied by the display unit 251 of the terminal body.

There may be two or more display units 251 according to the embodiment of the terminal 200. For example, in the terminal 200, a plurality of display units may be spaced apart from one another or may be disposed integrally with each other, or may be disposed on different surfaces.

(Hereinafter, referred to as a 'touch screen') in which a display unit 251 and a sensor (hereinafter, referred to as a 'touch sensor') for sensing a touch operation form a mutual layer structure, It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display portion 251 or a capacitance generated in a specific portion of the display portion 251 to an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the control unit 280. Thus, the control unit 280 can know which area of the display unit 251 is touched or the like.

A proximity sensor 241 may be disposed in an inner region of the terminal to be wrapped by the touch screen or in the vicinity of the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch & The act of actually touching the pointer on the screen is called "contact touch. &Quot; The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.

The audio output module 252 can output audio data received from the wireless communication unit 210 or stored in the memory 260 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 252 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the terminal 200. [ The sound output module 252 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 253 outputs a signal for notifying the terminal 200 of an event occurrence. Examples of events that occur in the terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 253 may output a signal for informing occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. The video signal or the audio signal may be output through the display unit 251 or the audio output module 252 so that they may be classified as a part of the alarm unit 253.

The haptic module 254 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 254 is vibration. The intensity and pattern of the vibration generated by the hit module 254 and the like are controllable. For example, different vibrations may be synthesized and output or sequentially output.

In addition to vibration, the haptic module 254 can be used for a variety of applications including, but not limited to, a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 254 can be implemented not only to transmit the tactile effect through direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. The haptic module 254 may include two or more haptic modules according to the configuration of the terminal 200.

The memory 260 may store a program for the operation of the control unit 280 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 260 may store data on vibration and sound of various patterns output when a touch is input on the touch screen.

In some embodiments, the memory 260 may include an operating system (not shown), a module that performs the function of the wireless communication unit 210, a module that operates in conjunction with the user input unit 230, an A / V input unit 220, A module that operates in conjunction with the output module 250, and a module that operates in conjunction with the output module 250. The operating system (e.g., LINUX, UNIX, OS X, WINDOWS, Chrome, Symbian, iOS, Android, VxWorks or other embedded operating systems) provides various software for controlling system tasks such as memory management, power management, Components and / or drivers.

The memory 260 may also store a configuration program associated with wireless power transmission or wireless charging. The setting program may be executed by the control unit 280. [

In addition, the memory 260 may store an application related to wireless power transmission (or wireless charging) downloaded from an application providing server (e.g., an application store). The wireless power transmission related application is a program for controlling wireless power transmission, and the electronic device 200 receives power wirelessly from the wireless power transmission apparatus 100 via the corresponding program, ) And a data communication link.

The memory 260 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or xD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. The terminal 200 may operate in association with a web storage that performs the storage function of the memory 260 on the Internet.

The interface unit 270 serves as a path for communication with all external devices connected to the terminal 200. The interface unit 270 receives data from an external device or supplies power to each component in the terminal 200 or transmits data in the terminal 200 to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 270.

The identification module is a chip for storing various information for authenticating the usage right of the terminal 200 and includes a user identification module (UIM), a subscriber identity module (SIM), a universal user authentication module A Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 200 through the port.

When the terminal 200 is connected to an external cradle, the interface unit may be a path through which the power from the cradle is supplied to the terminal 200, or various command signals input from the cradle by the user are transmitted to the terminal . The various command signals input from the cradle or the power source may be operated as a signal for recognizing that the terminal is correctly mounted on the cradle.

The controller 280 typically controls the overall operation of the terminal. For example, voice communication, data communication, video communication, and the like. The control unit 280 may include a multimedia module 281 for multimedia playback. The multimedia module 281 may be implemented in the control unit 280 or may be implemented separately from the control unit 280. The controller 180 may be realized as a separate module from the power receiving controller 292 in the power supply unit 290 described with reference to FIG. 2A or 2B, or may be implemented as a single module.

The control unit 280 may perform pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The control unit 280 performs wired charging or wireless charging according to a user input or an internal input. Herein, the internal input is a signal indicating that the induced current generated in the secondary coil in the terminal is detected.

As described above, the power reception control unit 292 in the power supply unit 290 may be included in the control unit 280, and operation by the power reception control unit 292 may be performed by the control unit 280 ) Can be understood as being performed.

The power supply unit 290 receives an external power supply and / or an internal power supply under the control of the controller 280 and supplies power necessary for operation of the respective components.

The power supply unit 290 may include a battery 299 for supplying power to each component of the terminal 200 and may include a charging unit 298 for wired or wirelessly charging the battery 299.

Although the present specification discloses a mobile terminal as an example of a device for receiving power wirelessly, the configuration according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, It will be readily apparent to those skilled in the art that the present invention may be applied to the present invention.

11 is a front perspective view of a charger according to one embodiment of the present invention.

The body 303 of the charger 300 includes a case (a casing, a housing, a cover, etc.) which forms an appearance. In this embodiment, the case may be divided into a front case 301 and a rear case 302. Various electronic components are embedded in the space formed between the front case 301 and the rear case 302. At least one intermediate case may be additionally disposed between the front case 301 and the rear case 302. [

The cases may be formed by injection molding a synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The body may include an output unit such as a display unit or a sound output unit, a user input unit, a socket 389 configured to supply power to the body, or an interface (not shown) to which external equipment is coupled.

The display unit 341 may be formed on the upper surface of the front case 301. The user input unit 360, the socket 389, and the like may be disposed on the side surfaces of the front case 301 and the rear case 302.

The user input unit 360 is operated to receive a command for controlling the operation of the mobile terminal 100 and may include a plurality of operation units 361 and 362. The operation units 361 and 362 may be collectively referred to as a manipulating portion and may be employed in any manner as long as the user operates in a tactile manner with a tactile impression.

The contents input by the first or second operation units 361 and 362 can be variously set. For example, the first operation unit 361 may receive a command such as the start and end of charging, and the second operation unit 362 may control the size of the sound outputted from the sound output unit 342, A brightness adjustment of the display unit 341, and the like.

On the upper surface of the body 303, a seating surface 301a on which the electronic device 200 to be charged is placed is formed. When the electronic device 200 is placed on the seating surface 301a, the sensing sensor included in the body 303 senses this and the wireless charging can be started.

FIG. 12 is a perspective view of a mobile terminal according to an embodiment of the present invention, and FIG. 13 is a rear perspective view of the mobile terminal shown in FIG.

12 and 13, the mobile terminal 400 includes a bar-shaped terminal main body 404. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, and a swing type in which two or more bodies are coupled to be movable relative to each other. Further, the mobile terminal described herein may be any portable electronic device having a camera and flash, for example, a mobile phone, a smart phone, a notebook computer, a digital broadcast terminal, a Personal Digital Assistants ), A PMO (Portable Multimedia Player), and the like.

The mobile terminal 400 according to the present invention includes a terminal main body 404 which constitutes the external appearance thereof.

The casing (housing, housing, cover, etc.) constituting the outer appearance of the terminal main body 404 is formed by the front case 401, the rear case 402, and the battery case 403. The battery case 403 is formed to cover the rear surface of the rear case 402.

Various electronic components are embedded in the space formed between the front case 401 and the rear case 402. The cases may be formed by injection molding a synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The front surface of the terminal body 404 includes a display unit 410, a first sound output unit 411, a front camera unit 416, a side key 414, an interface unit 415, and a signal input unit 417 .

The display unit 410 includes an LCD (Liquid Crystal Display) module, an OLED (Organic Light Emitting Diodes) module, and an e-paper for visually expressing information. The display unit 410 may include touch sensing means for inputting data by a touch method. Hereinafter, the display unit 410 including the touch sensing unit will be referred to as a 'touch screen'. If any one of the touches on the touch screen 410 is touched, the contents corresponding to the touched position are input. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like. The touch sensing means is formed in a translucent manner so that the display portion can be seen, and a structure for enhancing the visibility of the touch screen in a bright place may be included. Referring to FIG. 2, the touch screen 410 occupies most of the front surface of the front case 401.

The first sound output unit 411 may be implemented as a receiver for delivering a call sound to a user's ear or a loud speaker for outputting various alarm sounds or multimedia playback sounds.

The front camera unit 416 processes an image frame such as a still image or moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display unit 410. [

The image frame processed by the front camera 416 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ The front camera 416 may be provided in two or more depending on the use environment.

The signal input unit 417 is operated to receive a command for controlling the operation of the mobile terminal 400 and may include a plurality of input keys. The input keys may also be referred to as a manipulating portion and may be employed in any manner as long as the user has a tactile sense and operates in a tactile manner.

For example, a dome switch or touch screen capable of receiving a command or information by a push or touch operation of a user, a touch pad, or a wheel, a jog type or a joystick for rotating a key . The contents input by the signal input unit 417 can be variously set. For example, to enter start, end, scroll, and the like.

A side key 414, an interface unit 415, and an acoustic input unit 413 are disposed on the side surface of the front case 401.

The side key 414 can be collectively referred to as an operation unit, and can receive a command for controlling the operation of the mobile terminal 400. The side key 414 can be employed in any manner as long as the user is operating in a tactile manner with a tactile impression. The content input by the side key 414 can be set variously. For example, by the side key 414, it is possible to control the image input units 416 and 221, adjust the size of the sound output from the sound output unit 411, or switch the display unit 410 to the touch recognition mode Command can be input.

The sound input unit 413 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like.

The interface unit 415 is a path through which the mobile terminal 400 related to the present invention can exchange data with an external device. For example, the interface unit 415 may be a wired or wireless connection terminal for connecting to an earphone, a port for short-range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port A wireless LAN port) or the like, or power supply terminals for supplying power to the mobile terminal 400. The interface unit 415 may be implemented in the form of a socket for receiving an external card such as a SIM (Subscriber Identification Module) or a UIM (User Identity Module) or a memory card for storing information.

A power supply unit 440 and a rear camera unit 421 are disposed on the rear surface of the terminal body 404.

A flash 422 and a mirror (not shown) may be disposed adjacent to the rear camera unit 421. The flash illuminates the subject toward the subject when the subject is photographed by the rear camera unit 421.

The mirror allows the user to illuminate the user's own face or the like in the case where the user intends to take a picture of himself / herself (self-photographing) by using the rear camera unit 421.

The rear camera unit 421 may have a photographing direction substantially opposite to that of the front camera unit 416 disposed on the front side and may be a camera having pixels different from the front camera unit 416. [

For example, the front camera unit 416 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party. The rear camera unit 421 photographs a general subject and immediately transmits It is preferable to have a high pixel. The front and rear camera units 416 and 221 may be installed in the terminal body 404 to be rotatable or pop-upable.

The battery 440 supplies power to the mobile terminal 400. The battery 440 may be embedded in the terminal body 404 or may be detachable from the outside of the terminal body 404.

FIG. 14A is a conceptual diagram of a wireless charging system according to an embodiment of the present invention, FIG. 14B is a view showing an example in which a foreign object (FO) flows into a space where a flux linkage is formed, Figure 2 is a block diagram of a wireless charging system in accordance with an embodiment of the present invention.

Referring to FIG. 14A, the wireless charging system 10 may include a wireless power transmission apparatus 100, 300 and a wireless power reception apparatus 200, 400. The wireless power receiving apparatuses 200 and 400 may be mobile terminals 400 and the wireless power transmitting apparatuses 100 and 300 may be chargers 300 that can be disposed on the upper surface have.

The charger includes a transmit coil (Tx Coil) for transmitting wireless power, and the mobile terminal can include a receive coil (Rx Coil) for receiving power from a transmit coil (Tx Coil). 14A, line 1 and line 2 are center lines passing through a transmission coil (Tx Coil) and a reception coil (Rx Coil), respectively. When line 1 and line 2 coincide, charging efficiency can be raised during wireless charging. That is, the charging efficiency may be influenced by the arrangement of the mobile terminals placed on one side of the charger.

14B, the efficiency and performance of the wireless charging system 10 are lowered when an external material enters the space where the flux linkage is formed by the transmission coil Tx coil and the reception coil Rx coil, Can be heated by this flux linkage. The external material may be a conductor such as a coin. The external material may be heated to a certain temperature or higher to cause a user to be burnt. The wireless power transmission apparatuses 100 and 300, which constitute the wireless charging system 10, Or the wireless power receiving apparatuses 200 and 400 may be damaged by heat.

15, a wireless charging system 10 includes a wireless power transmission device 100, 300 and a wireless power receiving device 200, 400 (not shown) ).

The wireless power transmission apparatuses 100 and 300 may include a power transmission unit 110 and a power supply unit 190. The power transmission unit may include a transmission control unit 112 and a power conversion unit (first coil unit 111). And, the first coil portion may include a transmission coil (Tx Coil) formed to transmit radio power.

The wireless power transmission apparatuses 100 and 300 may include a transmission communication unit 117b that transmits and receives data wirelessly to and from the reception communication unit 217b of the wireless power receiving apparatuses 200 and 400 Data can be transmitted and received wirelessly using a communication method.

The transmission control unit is a microcomputer that controls the wireless power transmission apparatuses 100 and 300 as a whole and can control the wireless power transmission apparatuses 100 and 300 according to a predetermined process, The wireless power transmission apparatuses 100 and 300 can be controlled. Also, the transmission control unit can control the wireless power transmission apparatuses 100 and 300 based on the signals sensed by the sensing unit.

Meanwhile, the wireless power receiving apparatuses 200 and 400 may include a power supply unit 290 and a battery (LOAD) 299. The power supply unit may include a reception control unit 292 and a power reception unit (second coil unit) 291. The second coil unit may include a receiving coil (Rx Coil) configured to receive radio power.

The wireless power transmission apparatuses 100 and 300 may include a reception communication unit. The reception communication unit is a means for wirelessly transmitting and receiving data to and from a transmission communication unit of the wireless power transmission apparatuses 100 and 300, Data can be transmitted / received.

The reception control unit is a kind of microcomputer that controls the wireless power receiving apparatuses 200 and 400 as a whole or only a part related to the power, and can control the wireless power receiving apparatuses 200 and 400 according to a predetermined process, It is possible to control the wireless power receiving apparatuses 200 and 400 based on the data transmitted from the communication unit. Also, the reception control unit can control the wireless power transmission apparatuses 100 and 300 based on the signals sensed by the sensing units 117a and 217a.

Any one of the wireless power receiving apparatuses 200 and 400 and the wireless power transmitting apparatuses 100 and 300 may further include an alarm unit (not shown). The alarm unit is configured to output a signal for notifying the occurrence of an event. The transmission or reception control unit may output a predetermined signal through the alarm unit before adjusting the current supplied to the coil unit.

Referring to FIG. 14B and FIG. 15, the transmission control unit of the wireless power transmission apparatuses 100 and 300 determines whether a signal detected from the first coil unit is a preset inductance or impedance , The current supplied to the first coil part can be adjusted. Controlling the current means blocking the current supplied to the first coil part or supplying a small amount of current to the first coil part.

To this end, the sensing unit may sense the inductance or impedance change of the transmission coil (Tx Coil) and transmit the sensed result to the transmission control unit.

The sensing unit can measure inductance or impedance in various ways, but it can be measured by, for example, the following method.

First, a digital signal processor (DSP) can be used. That is, a sinusoidal current having a predetermined frequency and a constant peak value is applied to a coil using a DSP, and a peak value of a voltage applied to the coil is sensed, and the inductance value of the coil can be sensed through calculation. Equation (2) is a relational expression of inductance, voltage, and current, and is expressed by Equation (3) for the inductance.

That is, if the peak value of the voltage applied when a current having a constant peak value and period is applied to the coil is known, the value of the instantaneous value of the coil can be easily calculated.

The second method is to directly detect the inductance value or the impedance value of the transmission coil (Tx Coil) or the reception coil (Rx Coil) by using a transistor and an ammeter.

In the wireless charging system 10, the sensing unit may be formed in the wireless charging receiving device, and the sensing unit formed in the wireless charging receiving device may measure the inductance or impedance of the receiving coil (Rx Coil) of the second coil unit.

For example, the wireless charging system 10 can regulate the current supplied to the first coil section, as well as the first coil section, when the signal sensed from the second coil section is out of a predetermined inductance or impedance range. Because of the mutual induction effect by electric or magnetic fields, if the inductance or impedance changes in any one coil part, the inductance or impedance of the other coil part also changes.

That is, when the wireless power transmission apparatus 100, 300 has the first coil section and the wireless power receiving apparatus 200, 400 has the second coil section, the inductance or impedance of the first coil section is measured, The inductance or the impedance of the second coil part may be measured and then the current supplied to the first coil part may be cut off or a small amount of current may be supplied to the first coil part according to the measured result.

For example, if the inductance or impedance change of the second coil part is sensed, the sensed data is transmitted to the reception control unit, and the reception control unit can transmit the data through the transmission communication unit to the transmission control unit through the reception communication unit. At this time, the transmission control unit can cut off the current which is the first coil part based on the transmitted data or supply a small amount of current to the first coil part.

The wireless charging system 10 can sense the inductance or the impedance change of the first coil part and adjust the current supplied to the first coil part.

In addition, any one of the reception control section and the transmission control section can control the current supplied to the first coil section. When the reception control unit controls the signal, the signal related to the control can be transmitted to the transmission control unit through the communication units.

As described above, the wireless power transmission apparatus 100, 300 or the wireless charging system 10 according to the embodiment of the present invention can be applied to the first coil section when the signal sensed from the coil section is out of the predetermined inductance or impedance range It is possible to prevent the efficiency and performance of the wireless charging system 10 from being degraded or the external material to be heated by the flux linkage even if the external material is disposed in the space where the flux linkage is formed by adjusting the current.

16 shows the magnitude of the current supplied to the load and the magnitude of the current supplied to the wireless power transmission apparatuses 100 and 300 and the wireless power receiving apparatuses 200 and 400 when there is no external material in the space where the flux- The change of the inductance or impedance according to the state of alignment between the electrodes. 17 shows the magnitude of the current supplied to the load and the magnitudes of currents supplied to the wireless power transmission apparatuses 100 and 300 and the wireless power receiving apparatuses 200 and 300 when there is no external material in the space where the flux- 400 according to the alignment state of the inductance or the impedance. FIG. 17 shows a case where the current supplied to the load is intercepted or negligible in FIG. In the drawing, it means that the line 2 is spaced apart from the line 1 of the wireless power receiving apparatuses 200 and 400 by the center, the left or the right.

Referring to FIG. 16, it can be confirmed that the inductance or impedance value calculated when there is no foreign substance has a value between 4.8uH and 7.8uH, and between 3.9uH and 4.7uH when an external substance exists . That is, when there is an external material, the inductance or impedance values can be classified as being located above the graphs in the absence of external material.

Referring to FIG. 17, when the current supplied to the load is cut off or a small amount, referring to FIG. 17, the inductance or impedance value is 3uH when the external material is present or absent, Able to know. In other words, it can be seen that the current supplied to the load when the external material is present or not is cut off or the current value is small enough to distinguish the value. In this manner, after the current supplied to the load is cut off or only a small amount is supplied, the inductance or impedance of the coil part is measured, and it is confirmed whether or not the value is out of a predetermined range. Can be confirmed.

18 is a diagram showing the magnitude of the current supplied to the load and the change in inductance according to the alignment state between the wireless power transmission apparatuses 100 and 300 and the wireless power reception apparatuses 200 and 400. FIG.

Even when the arrangement state between the transmission coil and the reception coil (Rx coil) is greatly changed, the control method according to the embodiment of the present invention can confirm whether or not the foreign substance is introduced.

Referring to FIG. 18, even when the arrangement between the transmission coil and the reception coil (Rx Coil) is turned to the left or right by 15 mm, a no load or a low current (10 mA to 50 mA ), The inductance or impedance value is similar, and it can be confirmed that the convergence is converged to a point so that it can be distinguished from the value when the external material is introduced.

That is, the sensing method according to the present invention can detect the inflow of foreign matter when the load is unloaded or low load (10 mA to 50 mA) even when the arrangement between the transmission coil and the reception coil (Rx coil) is greatly changed.

19 is a flowchart showing an example of a control method of the wireless charging system 10 in a state ready for charging.

The charging ready state means that the user has not yet started transmitting the wireless power after placing the wireless power receiving apparatuses 200 and 400 close to the wireless power transmission apparatuses 100 and 300. [ Wireless power may be transmitted from the first coil portion when a signal to switch from a charge ready state to a charged state is input. However, since the external material may be in the space where the flux linkage is formed, the control method of the wireless charging system 10 according to the present invention may include the step of sensing the foreign matter before it is switched from the charging ready state to the charging state .

Referring to FIG. 19, the control method of the wireless charging system 10 may include a waiting step, a measuring step, and a controlling step.

The waiting step is a step in which the control unit receives a signal for switching from the charging ready state to the charging state. When the wireless power receiving apparatus 200 or 400 is placed in the wireless power receiving apparatus 200 or 400 proximate to the wireless power transmitting apparatus 100 or 300 in the charging ready state, And the wireless power transmission apparatuses 100 and 300 can automatically switch to the charging state according to the charging state.

The control unit receives the switching signal and cuts off the current supplied to the transmission coil Tx coil or supplies a small amount of current to the transmission coil Tx Coil through the transmission coil Tx coil or the reception coil Rx < / RTI > Coil) inductance or impedance.

Then, the control unit executes the control step. The control unit compares the measured inductance or impedance value with a predetermined range and cuts off the current supplied to the transmission coil (Tx Coil) when it is outside the predetermined range, Wait for ready to charge. However, if the predetermined range is not exceeded, the control unit switches the wireless power transmission apparatuses 100 and 300 to a charging state for supplying current to the transmission coil (Tx Coil) so that wireless power is transmitted. At this time, the control step may further include an output step. If the measured inductance or impedance value deviates from a predetermined range, the control part may output a signal for notifying the occurrence of an event to the alarm part.

As described above, the control unit cuts off the current supplied to the transmission coil (Tx Coil) or supplies a small amount of current to the transmission coil (Tx Coil) in the charging ready state before the wireless power is transmitted, The inductance and impedance of the coil (Tx Coil) can be measured.

20 is a flowchart showing an example of a control method of the wireless charging system 10 in a charged state.

An external material may flow into the space where the flux linkage is formed in the charged state. Accordingly, the method of controlling the wireless charging system 10 according to the present invention includes the step of sensing an external substance in a charged state.

Referring to FIG. 20, a control method of the wireless charging system 10 according to the present invention may include a measurement step and a control step.

In the measurement step, the control unit cuts off the current supplied to the transmission coil (Tx Coil) at a predetermined cycle or supplies a small amount of current to the transmission coil (Tx Coil), and transmits the transmission coil (Tx Coil) or the reception coil Coil inductance or impedance can be measured.

If the measured inductance or impedance value is within a predetermined range, the current supplied to the transmission coil (Tx Coil) is cut off and the radio power transmission apparatus Wait for ready to charge. However, if the predetermined range is not exceeded, the control unit maintains the charging state in which the wireless power transmission apparatus 100, 300 supplies the current to the transmission coil (Tx Coil) so that the wireless power is transmitted. At this time, the control step may further include an output step. If the measured inductance or impedance value deviates from a predetermined range, the control part may output a signal for notifying the occurrence of an event to the alarm part.

As described above, in the charging state in which the radio power is transmitted, the controller blocks the current supplied to the transmission coil (Tx Coil) at a predetermined cycle or supplies a small amount of current to the transmission coil (Tx Coil) The inductance and the impedance of the transmission coil Tx Coil can be measured.

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

Claims (17)

A coil portion configured to transmit wireless power; And
And a control unit configured to control a current supplied to the coil part when a signal detected from the coil part is out of a preset inductance or impedance range when an external material enters the space where the coil part is formed by the coil part Gt; The method according to claim 1,
Wherein the wireless power transmission apparatus further comprises a sensing unit configured to sense an inductance or an impedance change of a transmission coil provided in the coil unit. 3. The method of claim 2,
Wherein,
Wherein the control unit interrupts a current supplied to the transmission coil in a charging preparation state before the wireless power is transmitted, and measures the inductance or impedance of the transmission coil through the sensing unit. 3. The method of claim 2,
Wherein,
Wherein a small amount of current is supplied to the transmission coil in a state ready for charging before the wireless power is transmitted, and the inductance or impedance of the transmission coil is measured through the sensing unit. 3. The method of claim 2,
Wherein,
Wherein the measuring unit measures the inductance or impedance of the transmission coil through the sensing unit while shielding the current supplied to the transmission coil at a predetermined period of time while the wireless power is being transmitted. 3. The method of claim 2,
Wherein,
Wherein the inductance and impedance of the transmission coil are measured through the sensing unit while supplying a small amount of current to the transmission coil at regular intervals in a charged state in which wireless power is transmitted. The method according to claim 1,
(The wireless power transmission apparatus) further comprises an alarm section for outputting a signal for notifying occurrence of an event,
Wherein,
And outputs a predetermined signal through the alarm unit before adjusting a current supplied to the coil unit. A transmitting device having a first coil part and being configured to transmit wireless power;
A receiving device having a second coil portion and configured to receive wireless power from the transmitting device; And
When a signal sensed by any one of the coil sections is out of a predetermined inductance or impedance range when an external material is introduced into a space formed by the coil section and the coil section, And a control unit configured to adjust a current supplied to the first coil unit. 9. The method of claim 8,
The transmission device or the reception device may further comprise:
Further comprising a sensing unit configured to sense an inductance or an impedance change of the coil. 10. The method of claim 9,
Wherein,
Wherein the control unit interrupts the current supplied to the transmission coil of the first coil unit in a state ready for charging before the wireless power is transmitted and measures the inductance or impedance of the transmission coil through the sensing unit. 10. The method of claim 9,
Wherein,
Wherein a small amount of current is supplied to the transmission coil of the first coil part in a state ready for charging before the wireless power is transmitted and the inductance or impedance of the transmission coil is measured through the sensing part. 10. The method of claim 9,
Wherein,
Wherein the measuring unit measures the inductance or impedance of the transmission coil through the sensing unit while interrupting the current supplied to the transmission coil of the first coil unit at a predetermined period of time while the wireless power is being transmitted. 10. The method of claim 9,
Wherein,
Wherein the inductance and impedance of the transmission coil are measured through the sensing unit while supplying a small amount of current to the transmission coil at regular intervals in a charged state in which wireless power is transmitted. A standby step of receiving a signal for switching from a charging preparation state to a charging state;
Measuring the inductance or impedance of the transmission coil or the reception coil through the sensing unit while interrupting the current supplied to the transmission coil or supplying a small amount of current to the transmission coil upon receipt of the switching signal; And
Whether or not the value of the measured inductance or impedance is within a preset range is compared,
If the current is out of the predetermined range, the current supplied to the transmission coil is cut off,
And switching to a charging state for supplying current to the transmission coil so that the wireless power is transmitted if the transmission power does not exceed the predetermined range. 15. The method of claim 14,
Wherein the control step comprises:
Further comprising an output step of outputting a signal for notifying an occurrence of an event to an alarm unit when the measured inductance or impedance value is out of a preset range. Measuring the inductance or impedance of the transmission coil or the reception coil through the sensing unit while interrupting a current supplied to the transmission coil at a predetermined cycle in a charged state or supplying a small amount of current to the transmission coil; And
Whether or not the value of the measured inductance or impedance is within a preset range is compared,
If the current is out of the predetermined range, the current supplied to the transmission coil is cut off,
And maintaining a charging state for supplying a current to the transmission coil so that the wireless power is transmitted if the transmission power is not out of a predetermined range. 17. The method of claim 16,
Wherein the control step comprises:
Further comprising an output step of outputting a signal for notifying an occurrence of an event to an alarm unit when the measured inductance or impedance value is out of a preset range.

Images