KR20140060186A - Wireless power transfer apparatus having a plurality of power transmitter - Google Patents

Abstract

The present specification provides a wireless power transmitting apparatus and a wireless power transmitting method. The wireless power transmitting apparatus includes a plurality of power transmitters and controls a wireless power quantity according to a load condition. For this, the wireless power transmitting apparatus according to one embodiment of the present invention includes the power transmitters to transmit wireless power to a wireless power receiving apparatus. The wireless power receiving apparatus includes a plurality of power receivers which receive each of wireless power signals with different frequencies.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission apparatus including a plurality of power transmitters. ≪ Desc / Clms Page number 1 >

This specification relates to wireless power transmission. And more particularly, to a wireless power transmission apparatus and a wireless power transmission method that have a plurality of power transmitters and can adjust a wireless power amount according to a load condition.

[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 power transmission apparatus and a wireless power transmission method that have a plurality of power transmitters and can adjust the amount of wireless power according to load conditions.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including a plurality of power transmitters for forming a plurality of wireless power signals having different frequencies to transmit wireless power to a wireless power receiving apparatus, The receiving apparatus may include a plurality of power receivers capable of receiving each of the plurality of radio power signals having the different frequencies.

According to one embodiment of the present invention, each of the plurality of power transmitters includes: a power supply for supplying a DC input power; and a power supply for supplying either one of the plurality of wireless power signals And a power conversion unit that forms a wireless power signal of the wireless terminal.

As an example related to the present specification, the frequency of any one of the wireless power signals may be determined based on a driving frequency of the driving signal.

According to one embodiment of the present invention, the power conversion unit may include: an inverter that generates a carrier signal based on the switching operation based on the driving signal and the supplied DC input power source; and a control unit that, based on the carrier signal generated by the inverter, And a wireless power signal output circuit for forming any one of the wireless power signals.

As an example associated with the present disclosure, the wireless power signal output circuit may include at least one inductor and a capacitor, the at least one inductor and the at least one capacitor, Lt; / RTI > signal.

According to an embodiment of the present invention, each of the plurality of power transmitters further includes a power transmission control unit for controlling the power conversion unit to generate the one of the wireless power signals by applying the driving signal to the power conversion unit .

According to an embodiment of the present invention, a control unit controls a power transmission control unit included in the plurality of power transmitters so that a plurality of radio power signals having different frequencies are formed based on a plurality of drive signals having different drive frequencies, As shown in FIG.

According to one embodiment of the present disclosure, a plurality of driving signals having different driving frequencies are applied to the plurality of power transmitters, and a plurality of wireless power signals having the different frequencies are formed based on the plurality of driving signals. And a controller for controlling the plurality of power transmitters.

In one embodiment of the present invention, the frequency of each of the plurality of wireless power signals may be fixed regardless of a load change corresponding to the wireless power receiving apparatus.

As an example related to this specification, the control unit may further include a controller for controlling the selected one or more power transmitters to transmit the wireless power by the selected one or more power transmitters among the plurality of power transmitters.

As an example related to the present specification, the selection of one or more power transmitters among the plurality of power transmitters may be based on load information corresponding to the wireless power receiving apparatus.

As an example associated with the present disclosure, the plurality of power transmitters includes a variable power transmitter for forming a variable wireless power signal based on a power control parameter to transmit wireless power, , Adjusts the power control parameter based on load information corresponding to the wireless power receiving apparatus, forms the variable wireless power signal based on the adjusted power control parameter, and transmits the variable wireless power signal to the wireless power receiving apparatus And a controller for controlling the variable power transmitter so that the amount of radio power is adjusted.

As an example related to the present specification, the power control parameter may be at least one of a frequency of the variable wireless power signal, a duty-cycle of the variable wireless power signal, and a DC power source supplied to the variable power transmitter Lt; / RTI >

As an example related to the present specification, the load information may be obtained from the wireless power receiving apparatus.

The load information may include at least one of a load condition of the wireless power receiving apparatus, a type of the wireless power receiving apparatus, a wireless power amount to be transmitted to the wireless power receiving apparatus, and a rated power of the wireless power receiving apparatus Lt; / RTI >

As an example related to the present specification, the load condition may be an impedance of the wireless power receiving apparatus or an impedance in a state where the wireless power receiving apparatus is connected to the wireless power transmitting apparatus, and a total impedance . ≪ / RTI >

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including a variable power transmitter configured to form a first wireless power signal based on a power control parameter to transmit wireless power to a wireless power receiving apparatus, 2 fixed power transmitter for forming a wireless power signal and transmitting the wireless power to the wireless power receiving apparatus and adjusting the power control parameter based on load information corresponding to the wireless power receiving apparatus, Or a controller for selectively activating or deactivating the fixed power transmitter to adjust the amount of radio power transmitted to the wireless power receiving apparatus.

As an example related to the present specification, the number of the fixed power transmitters may be plural, and the frequencies of the radio power signals formed by each of the plurality of fixed power transmitters may be different.

As an example related to the present specification, the load information may be obtained from the wireless power receiving apparatus.

According to another aspect of the present invention, there is provided a wireless power transmission method including forming a first wireless power signal based on a power control parameter to transmit wireless power to a wireless power receiving apparatus, The method of claim 1, further comprising the steps of: generating a power signal to deliver wireless power to the wireless power receiving apparatus; and adjusting the power control parameter based on load information corresponding to the wireless power receiving apparatus, And controlling the amount of radio power transmitted to the wireless power receiving apparatus by selectively activating or deactivating the transmitter.

According to one embodiment disclosed herein, a variable power transmitter capable of transmitting variable power and at least one fixed power transmitter for transmitting fixed power and capable of efficiently It is possible to control the amount of transmitted power and to generate a plurality of wireless power signals having different frequencies, thereby improving the EMI.

1 is an exemplary diagram conceptually showing a wireless power transmission device and an electronic device according to embodiments of the present invention.
2 (a) and 2 (b) are block diagrams illustrating a configuration 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 apparatus to an electronic apparatus wirelessly according to an inductive coupling scheme.
4 is a block diagram exemplarily showing a part of the configuration of the electromagnetic induction type wireless power transmission device 100 and the electronic device 200 that can be employed in the embodiments disclosed herein.
5 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with an inductive coupling scheme employable in the embodiments disclosed herein.
6 shows a concept that power is transferred from a wireless power transmission device to an electronic device wirelessly according to a resonant coupling scheme.
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).
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.
11 illustrates the concept of transmitting and receiving packets between a wireless power transmission device and an electronic device through modulation and demodulation of a wireless power signal in the wireless power transmission disclosed herein.
FIG. 12 shows a method of displaying data bits and bytes constituting a power control message by the wireless power transmission apparatus 100. FIG.
FIG. 13 illustrates a packet including a power control message used in a wireless power transfer method in accordance with the embodiments disclosed herein.
FIG. 14 illustrates operating states of a wireless power transmission device 100 and an electronic device 200 in accordance with the embodiments disclosed herein.
15 to 19 illustrate the structure of packets including the power control message between the wireless power transmission apparatus 100 and the electronic apparatus 200. FIG.
20 is an exemplary view showing a structure of an LLC resonant converter.
21 shows a transmission gain change according to a transmission frequency in an LLC resonant converter.
22 is an exemplary diagram illustrating First Harmonic Approximation (FHA) of an LLC resonant converter.
23 is an exemplary diagram illustrating a wireless power receiving apparatus including a plurality of power receivers and a plurality of power transmitters having different fixed frequencies according to an embodiment disclosed herein;
24 is a configuration diagram showing the configuration of a power transmitter of any one of a plurality of power transmitters according to the embodiment disclosed herein.
25 is an exemplary diagram showing a configuration of a power conversion unit according to an embodiment disclosed herein.
26 is a configuration diagram illustrating a wireless power transmission apparatus including a plurality of power transmitters according to an embodiment disclosed herein.
27 is a configuration diagram illustrating a configuration of a wireless power transmission apparatus including a plurality of power transmitters according to another embodiment disclosed herein.
28 is an exemplary diagram illustrating a wireless power transmission method in accordance with one embodiment disclosed herein.
29 is an exemplary diagram illustrating a wireless power transmission apparatus including a variable power transmitter according to an embodiment disclosed herein;
30 is an exemplary diagram illustrating an application to which a wireless power transmission method according to an embodiment disclosed herein may be applied.
31 is a graph illustrating a comparison of transmission efficiency between a wireless power transmission apparatus and an existing wireless power transmission apparatus according to an embodiment disclosed herein.
32 is a graph comparing EMI performance between a wireless power transmission apparatus and an existing wireless power transmission apparatus according to an embodiment disclosed herein.
33 is an exemplary diagram showing an example in which the wireless power transmission method disclosed in this specification is applied to an electric vehicle;
34 is a flow diagram illustrating a wireless power transmission method in accordance with one embodiment disclosed herein.

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 ", etc. 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 the components used in the present specification are given or mixed in consideration of ease of description, 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 are used to designate identical 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. [

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 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 .

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

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

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

In 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 and 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 the power transmission of the wireless power transmission apparatus 100 is 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 a 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 for converting the rectified current into a more flat and stable direct current. The output power of the rectifying circuit 2913 is supplied to the respective components of the power supply unit 290. The rectifying circuit 2913 is a DC-DC converter that converts the output DC power to an appropriate voltage to match the power required for each component of the power supply unit 290 (for example, a circuit similar to the charging unit 298) (DC-DC converter).

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

The power supply unit 290 may further include a power sensing unit 2914. The power sensing unit 2914 of the 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 as shown in FIG. 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.

The operation of the control unit 280 to control the respective components when the above-described wireless charging is performed will be described in detail with reference to the operation state in FIG. 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 other embodiments.

11A and 11B- Backscatter Modulation

11A and 11B illustrate the concept of transmitting and receiving packets between a wireless power transmission device and an electronic device through modulation and demodulation of a wireless power signal in wireless power transmission according to the embodiments disclosed herein.

11A, since the wireless power signal formed by the power conversion unit 111 forms a closed-loop in a magnetic field or an electro-magnetic field, When the device 200 modulates the wireless power signal while receiving the wireless power signal, the wireless power transmission device 100 may sense the modulated wireless power signal. Demodulation unit 113 demodulates the detected radio power signal and can decode the packet from the demodulated radio power signal.

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

11B, the power reception control unit 292 of the electronic device 200 receives the wireless power signal 10a received through the power receiving unit 291, and outputs the wireless power signal 10a to the load impedance of the modem unit 293. [ (Impedance). The power reception control unit 292 modulates the wireless power signal 10a so that a packet including a power control message to be transmitted to the wireless power transmission apparatus 100 is included.

Thereafter, the power transmission control unit 112 of the wireless power transmission apparatus 100 demodulates the modulated wireless power signal 10b through an envelope detection process, and transmits the detected signal 10c And decodes it into digital data 10d. The demodulation process detects that the current or voltage flowing through the power conversion unit 111 is divided into two states by the HI phase (HI phase) and the LO phase (Phase) by the modulated wireless power signal, The electronic device 200 obtains a packet to be transmitted by the electronic device 200 based on the digital data classified according to the type of the digital data.

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

12A and 12B- Bit  Encoding, Byte Format

12A and 12B show how the wireless power transmission apparatus 100 displays the data bits and bytes constituting the power control message.

Referring to FIG. 12A, the power transmission control unit 112 detects an encoded bit using a clock signal CLK from an envelope-detected signal. The detected encoded bits are encoded according to the bit encoding method used in the modulation process on the electronic device 200 side. In some embodiments, the bit encoding method may be NRZ (non-return to zero). In some embodiments, the bit encoding method may be bi-phase encoding.

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

On the other hand, the power transmission control unit 112 can obtain data in units of bytes by using a byte format that forms a packet from the bit stream detected according to the bit encoding method. In some embodiments, the detected bit stream may be transmitted using an 11-bit asynchronous serial format as shown in FIG. 12B. That is, it may include a start bit indicating the start of the byte and a stop bit indicating the end, and may include data bits (b0 through b7) between the start bit and the end bit. In addition, a parity bit for checking the error of the data may be added. The byte-by-byte data constitutes a packet including a power control message.

Figure 13 - Packet format

FIG. 13 illustrates a packet including a power control message used in a wireless power transfer method in accordance with the embodiments disclosed herein.

The packet 500 may be configured to include a preamble 510, a header 520, a message 530 and a checksum 540.

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

The header 520 is used to indicate the type of the packet 500. The size and type of the message 530 may be determined based on the value indicated by the header 520. The header 520 is a value having a predetermined size and is located after the preamble 510. For example, the header 520 may be one byte in size.

The message (530) is configured to include data determined based on the header (520). The message 530 has a predetermined size according to the type.

The checksum 540 is used to detect an error that may occur in the header 520 and the message 530 during transmission of a power control message. The header 520 and the message 530 excluding the preamble 510 for synchronization and the checksum 540 for error checking may be called an instruction packet (command_packet).

Figure 14 - Operating state ( Phases )

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

FIG. 14 illustrates operating states of a wireless power transmission device 100 and an electronic device 200 in accordance with the embodiments disclosed herein. 15 to 19 show the structure of packets including the power control message between the wireless power transmission apparatus 100 and the electronic apparatus 200. [

14, the operating states of the wireless power transmission apparatus 100 and the electronic device 200 for wireless power transmission include a selection phase 610, a detection state (Ping Phase) 620, An Identification and Configuration Phase 630, and a Power Transfer Phase 640. [0064]

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

Also, in the identifying and setting state 630, the wireless power transmission apparatus 100 identifies the selected electronic device 200 through the previous states and acquires setting information for power transmission. In the power transmission state 640, the wireless power transmission apparatus 100 transmits power to the electronic device 200 while adjusting power to be transmitted corresponding to the control message received from the electronic device 200 .

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

1) Selection Phase

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

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

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

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

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

Also, in embodiments where power is transmitted according to the resonant coupling scheme, the wireless power transmission apparatus 100 in the selected state 610 may receive at least one of the frequency, current, and voltage of the power conversion unit due to an object in the sensing area So that the object can be detected.

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

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

2) Detection status (Ping Phase)

The wireless power transmission apparatus 100 in the detection state 620 performs a process of detecting an electronic device 200 existing in the sensing area through a power control message. The detection process in the detection state 620 may be referred to as digital ping in comparison with the detection process of the electronic device 200 using the characteristic of the wireless power signal in the selected state 610. [

In the detection state 620, the wireless power transmission apparatus 100 forms a wireless power signal for detecting the electronic device 200, demodulates the wireless power signal modulated by the electronic device 200, And obtains a power control message in the form of digital data corresponding to the response to the detection signal from the demodulated wireless power signal. The wireless power transmission apparatus 100 may recognize the electronic device 200 that is the object of power transmission by receiving a power control message corresponding to a response to the detection signal.

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

Meanwhile, the power control message corresponding to the response to the detection signal may be a message indicating the strength of the wireless power signal received by the electronic device 200. For example, the electronic device 200 may transmit a signal strength packet 5100 including a message indicating the strength of the received wireless power signal as a response to the detection signal as shown in FIG. 15 Lt; / RTI > The packet 5100 may be configured to include a header 5120 indicating that the packet is a packet representing the signal strength and a message 5130 indicating the strength of the power signal received by the electronic device 200. The strength of the power signal in the message 5130 may be a value indicative of the degree of coupling of inductive coupling or resonant coupling for power transmission between the wireless power transmission device 100 and the electronic device 200.

The wireless power transmission apparatus 100 may receive the response message to the detection signal and detect the electronic device 200 and then extend the digital detection process to enter the identification and detection state 630. [ That is, the wireless power transmission apparatus 100 may receive the power control message required in the identification and detection state 630 by maintaining the power signal of the specific operation point after discovery of the electronic device 200.

However, if the wireless power transmission apparatus 100 does not find the electronic device 200 capable of transmitting power, the operation state of the wireless power transmission apparatus 100 may be returned to the selected state 610 .

3) Identification and Configuration Phase

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

In the identifying and setting state 630, the electronic device 200 may transmit a power control message including its own identification information. To this end, the electronic device 200 may transmit an identification packet 5200 including a message indicating identification information of the electronic device 200, for example, as shown in FIG. 16A. The packet 5200 may be configured to include a header 5220 indicating that it is a packet indicating identification information and a message 5230 including identification information of the electronic device. The message 5230 includes information 2531 and 5232 indicating the protocol version for wireless power transmission, information 5233 identifying the manufacturer of the electronic device 200, information 5234 indicating the presence or absence of the extension device identifier And a base unit identifier 5235. [ In addition, when it is indicated that the extension device identifier exists in the information 5234 indicating the presence or absence of the extension device identifier, an Extended Identification Packet 5300 including the extension device identifier as shown in FIG. 16B Can be transmitted separately. The packet 5300 may be configured to include a header 5320 indicating that the packet is an extension device identifier, and a message 5330 including an extension device identifier. When the extension device identifier is used, information based on the manufacturer's identification information 5233, the base device identifier 5235, and the extension device identifier 5330 is used to identify the electronic device 200 Can be used.

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

Meanwhile, according to the embodiments disclosed herein, the electronic device 200 may transmit a power control message including its required power information or its profile information to the wireless power transmission device 100. [ In some embodiments, the requested power information of the electronic device 200 or the profile information thereof may be transmitted in a configuration packet 5400 as shown in Fig. In some embodiments, the requested power information of the electronic device 200 or its profile information may be transmitted in a packet for setting.

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

The wireless power transmission apparatus 100 may terminate the identification and setting state 630 and return to the selection state 610 before entering the power delivery state 640. [ For example, the wireless power transmission device 100 may terminate the identification and setting state 630 to look for other electronic devices capable of receiving power wirelessly.

4) Power Transfer Phase (Power Transfer Phase)

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

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

In the power transmission state 640, the wireless power transmission apparatus 100 may monitor parameters in a power transfer contract generated based on the identification information and / or the setting information. As a result of monitoring the parameters, when the power transmission to the electronic device 200 violates the limitations contained in the power transfer protocol, the wireless power transmission apparatus 100 cancels the power transmission, State 610. < / RTI >

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

In some embodiments, when the charging of the battery is completed while the electronic device 200 is charging the battery using the transmitted power, a power control request to stop the wireless power transmission to the wireless power transmission apparatus 100 Message. In this case, the wireless power transmission apparatus 100 may terminate the wireless power transmission and return to the selected state 610 after receiving the message requesting the suspension of the power transmission.

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

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

Hereinafter, a wireless power transmission apparatus and a wireless power transmission method capable of adjusting a wireless power amount according to a load condition and having a plurality of power transmitters will be described with reference to FIGS. 20 to 34. FIG.

The technique disclosed in this specification relates to a control method and structure for a plurality of wireless power transmission apparatuses to operate in an optimum efficiency state according to a load condition and to enlarge margins for EMI regulation, and a plurality of wireless power transmission apparatuses Transmitter and a plurality of wireless power transmission apparatuses capable of improving heat dissipation and EMI problems.

In recent years, wireless power transmission technology has attracted attention in the IT market, and has been applied to a wide range of products ranging from cellular phones, notebook computers, televisions, and electric vehicles.

Wireless power transmission technology is being applied to products with increasing power capacities from wireless power transmission devices for mobile phones of less than 10W to wireless power transmission devices for electric vehicles of kW capacity.

 As wireless power transmission technology is applied to products with large power capacities, there is a need for research on resonance type converters (or wireless power transmission devices) with low efficiency problems and EMI problems that are not constant depending on the load conditions of products to be.

Here, the load corresponding to the wireless power receiving apparatus may represent a commonly known meaning in the technical field. For example, the load may mean an impedance corresponding to the wireless power receiving apparatus. Alternatively, the load may mean a power consumed by the wireless power receiving apparatus. Alternatively, the load may mean an amount of a receiving end current flowing to the wireless power receiving apparatus.

The load may vary due to various causes. For example, when the number of the wireless power receiving apparatuses connected to the wireless power receiving apparatus changes, the load may be changed by an external cause (for example, a change in the amount of received power required) The load may vary due to various causes.

Explanation of characteristics change of wireless power transmission device according to load change

Hereinafter, the characteristics of the wireless power transmission apparatus according to the load variation will be described.

The characteristics of the wireless power transmission apparatus may refer to various characteristics related to the performance of the wireless power transmission apparatus. For example, the characteristics of the wireless power transmission apparatus may include at least one of a transmission efficiency of the wireless power transmission apparatus, a transmission gain, a transmission side (or transmitting end) voltage of the wireless power transmission apparatus, (Or receiving end) voltage of the power receiving apparatus.

It will be apparent to those skilled in the art that various features related to the performance of the wireless power transmission device may be included in the characteristics of the wireless power transmission device.

Hereinafter, an LLC resonant converter included in the wireless power transmission apparatus will be described in order to examine changes in transmission gain among characteristics changes of the wireless power transmission apparatus according to the load change.

The transmission gain of the wireless power in a wireless power transmission system may need to be adjusted if a change in load (laod) corresponding to the wireless power receiving device occurs. The wireless power transmission system may be a general concept including a wireless power transmission device, a wireless power reception device, and a channel (air, etc.) through which a wireless power signal is propagated.

The transmission gain of the wireless power may be of a generally known meaning in the art. For example, the transmission gain may be a ratio between a ratio between a transmission power of the wireless power transmission apparatus and a reception power of the wireless power reception apparatus, a transmission side voltage of the wireless power transmission apparatus, and a reception side voltage of the wireless power reception apparatus And a ratio between a transmission side current of the wireless power transmission device and a reception side current of the wireless power reception device.

In general, the transmission gain can be expressed through a change in the transmission gain with respect to the transmission frequency. The change in the transmission gain with respect to the transmission frequency can be expressed in a graph form, and in this respect, it can be referred to as a transmission gain profile.

Through the transmission gain profile, the wireless power transmission apparatus can determine a transmission frequency corresponding to a wireless power signal for transmitting wireless power. For example, the wireless power transmission apparatus can determine, at the transmission frequency, through the transmission gain profile, the wireless power signal to be sent to the wireless power reception apparatus, when the target transmission gain is determined.

As to the need to adjust the transmission gain, if the load changes due to a specific cause, the transmission gain of the wireless power may change. This is because, when the load changes, the Q value changes and the transmission gain profile changes according to the change of the Q value, so that the transmission gain at the current transmission frequency can be changed. Therefore, in a wireless power transmission system in general, since a target transmission gain at the time of wireless power transmission may exist, if a change in transmission gain due to a change in the load occurs, the changed transmission gain returns to the target transmission gain again There is a need to adjust the transmission gain.

As a simple method of adjusting the transmission gain, there may be a method of adjusting the transmission gain by adjusting the transmission frequency.

Generally, a wireless power transmission system can serve as a resonant converter in terms of the role of transmission of wireless power. Resonant converters use resonant tanks for power conversion and are widely used for many advantages such as high efficiency and small size.

Hereinafter, the role of the resonant converter of the wireless power transmission system will be described. However, in a narrow sense, the resonant converter may mean only the wireless power transmission device side.

In the currently used resonant converter, when the load corresponding to the wireless power receiving apparatus is changed, the switching frequency of the resonant converter (or the driving frequency of the wireless power transmission apparatus) It may be accompanied by a change. The switching frequency may be the same or similar to the frequency of the wireless power signal formed by the wireless power transmission apparatus.

The resonant converter can be of various types or types. For example, the resonant converter may include an LLC resonant converter, a series resonant converter, or a parallel resonant converter.

20 is an exemplary view showing a structure of an LLC resonant converter.

Referring to FIG. 20, since the LLC resonant converter C100 has a wide input voltage and output load range and can use the leakage inductance of the transformer as a resonant inductor, it may be advantageous to reduce the magnetic element.

As noted above, in a narrow sense, it should be noted that the LLC resonant converter may only refer to the role of the wireless power transmission device side (or primary side, 100 '). Hereinafter, the LLC resonant converter C100 will be described as meaning a whole wireless power system (concept including 100 'and 200') in a broad sense.

The LLC resonant converter basically has a role of converting a DC input voltage (or a DC signal, Vin) into an AC signal (alternating current, Ir) on the basis of a switching operation by the switching units Q1 and Q2 (including C110) can do.

The switching unit C100 may correspond to the inverter 1112 included in the power conversion unit 111 of the wireless power transmission apparatus 100 described above.

The switching unit C100 may receive a driving signal from an external device (for example, the power transmission control unit 180 or the control unit 180). The drive signal may be applied to the switching elements Q1 and Q2 to control the switching unit C100 to perform a switching operation.

The AC signal Ir may be a signal corresponding to the carrier signal which is the AC waveform generated in the inverter 1112 described above.

The carrier signal may drive the oscillation circuit C120, and the radio power signal may be generated from the transmission coil 1111 by the driving. That is, the wireless power signal may be formed based on the carrier signal.

In the case of the induction method, the above-mentioned resonance-causing passive elements (such as an inductor, a capacitor, or the like) may be used as a component of the above-described wireless power transmission apparatus 100. [ Resistance element) and the transmission coil 1111a. In the case of the resonance system (or resonance system), the concept may correspond to the resonance forming circuit 1116 and the transmission coil 1111b.

Accordingly, the wireless power receiving apparatus side (or the secondary side, 200 ') receives the wireless power signal through the receiving coil 2911 and receives (or receives) the wireless power based on the wireless power signal, . The battery or the like may be a concept corresponding to the load resistance Ro.

Since the LLC resonant converter C100 is generally known in the technical field, detailed operation will be omitted.

21 shows a transmission gain change according to a transmission frequency in an LLC resonant converter.

Referring to FIG. 21, characteristics of a transmission gain profile according to a transmission frequency of the LLC resonant converter C100 can be known.

The switching operation of the LLC resonant converter C100 decreases the switching frequency (or the driving frequency of the driving signal to the transmission frequency corresponding to the wireless power signal) as the load increases in the inductive region, Can be controlled in such a way that the switching frequency is increased.

That is, when the load Ro corresponding to the wireless power receiving apparatus 200 'is decreased, the Q value decreases and the increase of the transmission gain due to the decrease of the Q value can be prevented by reducing the switching frequency have. Also, when the load Ro increases, the Q value increases, and the reduction of the transmission gain due to the increase of the Q value can be prevented by increasing the switching frequency.

However, the relationship between the load and the transmission gain may be changed according to the operation state of the resonant converter. That is, according to the operation state of the resonant converter, the switching frequency can be increased when the load is reduced, and the switching frequency can be reduced when the load is reduced.

22 is an exemplary diagram illustrating First Harmonic Approximation (FHA) of an LLC resonant converter.

22, in the case of the LLC resonant converter C100, a first harmonic approximation (FHA) is applied to a primary side (or a wireless power transmission apparatus side, 100 ') resonant network Assuming that only the fundamental wave component of the input square-wave voltage contributes to the energy transfer (Ro: equivalent resistance of the load), the Q value is changed when the load Ro is changed, Lt; / RTI > can be varied to maintain the switching frequency.

Here, the Q value can be calculated by the following equations (2) and (3).

Generally, in the case of a wireless power transmission device of less than 10W for a mobile phone, a single wireless circuit composed of a transmission bridge (or transmitting side, resonant converter) circuit of a half bridge structure of a charging pad and a rectifier and receiver circuit of a TX coil, And can operate as a power transmission device.

In addition, a method of maintaining a constant output by changing a switching frequency according to a load condition of a mobile phone during wireless power transmission may be used.

 This is because the Q value is changed when the load condition RO is changed due to the characteristics of the resonant converter circuit (see Fig. 20) used in the wireless power transmission device, and the transmission gain Gain is changed thereby (see Fig. 21) This may be due to the need to change the switching frequency to maintain.

This principle applies equally to high power wireless power transmission devices as well as low power wireless power transmission devices for mobile phones.

However, in the case of a high power wireless power transmission device, when a product having a large fluctuation range from a no load condition to a full load condition is operated, the fluctuation of the switching frequency greatly increases and the average efficiency in the entire load range may be reduced.

 This is because the characteristics of the resonant converter circuit used in the wireless power transmission apparatus can minimize the impedance value of the resonant tank when the switching frequency operates at the resonant frequency, so that the highest efficiency can be obtained.

In addition, resonance type converters have a characteristic that the efficiency drops sharply toward the light load, and it may be difficult to maintain good efficiency characteristics under all load conditions.

 As described above, resonance converters have been researched and developed in order to improve the characteristic of lowering the efficiency when the switching frequency is far from the resonance frequency. The research direction is to newly construct an inductor and capacitor combination of the resonant tank to develop a transmission gain curve with a steeper slope than the conventional transmission gain curve or to optimize the efficiency of the circuit elements.

In order to improve the weak point of the resonant converter whose efficiency drops sharply under the light load condition, control methods are being studied so that the rectifier circuits of the secondary side can be efficiently operated.

 However, there is no technology that can be applied to a high power wireless power transmission device to solve the problem clearly yet.

 Therefore, in order to develop a high-power wireless power transmission device that handles all load conditions from no load to full load, it may be necessary to develop a technology that can achieve stable efficiency under all load conditions.

A wireless power transmission apparatus comprising a plurality of power transmitters having different frequencies

The wireless power transmission apparatus according to an embodiment disclosed herein may include a plurality of power transmitters that form a plurality of wireless power signals having different frequencies to transmit wireless power to a wireless power receiving apparatus.

Here, the wireless power receiving apparatus may include a plurality of power receivers capable of receiving a plurality of wireless power signals having different frequencies.

According to one embodiment, each of the plurality of power transmitters includes: a power supply unit that supplies a DC input power; and a power supply unit that supplies power to any one of the plurality of wireless power signals based on the switching operation by the supplied DC input power and the drive signal. And a power conversion unit for forming a power signal.

Here, the frequency of any one of the wireless power signals may be determined based on the driving frequency of the driving signal.

According to an embodiment of the present invention, the power converter may further include: an inverter that generates a carrier signal based on the switching operation based on the driving signal and the supplied DC input power source; and a control unit that, based on the carrier signal generated by the inverter, And a wireless power signal output circuit for forming any one of the wireless power signals.

Here, the wireless power signal output circuit may include at least one inductor and a capacitor, and may form any one of the wireless power signals based on the carrier signal and a resonance phenomenon caused by the at least one inductor and the capacitor. have.

According to an embodiment, each of the plurality of power transmitters further includes a power transmission control unit for controlling the power conversion unit to generate the one of the wireless power signals by applying the driving signal to the power conversion unit .

The wireless power transmission apparatus may further include a controller for controlling a power transmission control unit included in the plurality of power transmitters so that a plurality of wireless power signals having different frequencies are formed based on a plurality of drive signals having different drive frequencies, As shown in FIG.

According to another embodiment, a plurality of driving signals having different driving frequencies are applied to the plurality of power transmitters, and a plurality of wireless power signals having different frequencies are formed based on the plurality of driving signals. And a controller for controlling the plurality of power transmitters.

According to an embodiment, the frequency of each of the plurality of wireless power signals may be fixed regardless of a load change corresponding to the wireless power receiving apparatus.

In addition, according to an exemplary embodiment, the control unit may further include a controller for controlling the selected one or more power transmitters to transmit wireless power by the selected one or more power transmitters among the plurality of power transmitters.

Here, the selection of one or more power transmitters among the plurality of power transmitters may be based on load information corresponding to the wireless power receiving apparatus.

23 is an exemplary diagram illustrating a wireless power receiving apparatus including a plurality of power receivers and a plurality of power transmitters having different fixed frequencies according to an embodiment disclosed herein;

Referring to FIG. 23, a wireless power transmission apparatus 100 according to an exemplary embodiment of the present invention includes a plurality of wireless power signals having different frequencies to transmit wireless power to a wireless power receiving apparatus 200 Of power transmitter T100.

For example, the plurality of power transmitters T100 may be n power transmitters (power transmitters -1 through n).

In this case, the wireless power receiving apparatus 200 receiving the wireless power from the wireless power transmission apparatus 100 may include a plurality of power receivers R100 capable of receiving each of the plurality of wireless power signals having the different frequencies .

For example, the plurality of power receivers R100 may be n power receivers (power receiver-1 to power receiver-n).

24 is a configuration diagram showing the configuration of a power transmitter of any one of a plurality of power transmitters according to the embodiment disclosed herein.

Referring to FIG. 24, the power transmitter (or each of the plurality of power transmitters, T100) according to the embodiment disclosed herein is characterized in that the wireless power transmission apparatus 100 includes the inductive coupling method and the resonant coupling A power conversion unit 111, and a power supply unit 190, which support one or more of the following methods.

The power transmitter (T100) may further include a power transmission control unit (112).

Hereinafter, the components will be described in order.

In general, the power supply unit 190 may receive an external power supply and / or an internal power supply to supply power required for operation of each component.

According to an embodiment of the present invention, the power supply unit 190 may supply DC input power (or voltage) to the power conversion unit 111.

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 the wireless power receiving apparatus 200.

The wireless power signal transmitted by the power conversion unit 111 may be 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.

According to one embodiment disclosed herein, the power conversion unit 111 forms any one of the plurality of wireless power signals based on the switching operation by the supplied DC input power source and the driving signal And may transmit wireless power to the wireless power receiving apparatus 200.

According to an embodiment, the frequency of any one of the wireless power signals may be determined based on a driving frequency of the driving signal. For example, if the driving frequency is 100 kHz, the frequency of the wireless power signal may be determined to be 99 kHz.

The driving signal may be a signal applied to the switching element included in the power conversion unit 111 and may be a signal that oscillates (or oscillates) at a specific frequency (or switching frequency).

The switching element may be included in an inverter (to be described later) (see FIG. 25). The DC input voltage (or signal) can be converted into an AC signal (or alternating current to AC waveform) by the switching element. This will be described later in detail with reference to FIG.

The power transmission control unit 112 may control each component included in the power conversion unit 111. [ 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.

According to one embodiment, when the power transmission control unit 112 is included in each of the plurality of power transmitters, the power transmission control unit 112 applies the drive signal to the power conversion unit 111, The power conversion unit 111 may be controlled so that any one of the power signals may be generated.

25 is an exemplary diagram showing a configuration of a power conversion unit according to an embodiment disclosed herein.

Referring to FIG. 25, the power conversion unit 111 may include an inverter 1112 and a wireless power signal output circuit 1110.

Specifically, the power conversion unit 111 includes an inverter for generating a carrier signal based on the switching operation based on the driving signal and the supplied DC input power supply, and an inverter for generating a carrier signal based on the carrier signal generated by the inverter And a wireless power signal output circuit that forms one wireless power signal.

The inverter 1112 may convert a DC input (DC input or DC input power) obtained from the power supply unit 190 into an AC waveform (AC waveform or AC signal). The AC signal may be the carrier signal p110.

The conversion of the DC input to the AC waveform may be performed by a switching element included in the inverter 1112 (for example, corresponding to Q1 and Q2 of a general resonant converter) and a driving signal for driving the switching element.

The wireless power signal output circuit 1110 can output (or form) the wireless power signal p120 based on the alternating current (or the carrier signal p110) modified by the inverter 1112. [

Specifically, the alternating current p110 can drive an oscillating circuit (or a resonant circuit) composed of an inductor Lr, a capacitor Cr, and a transmission coil Lt included in the radio power signal output circuit 1110 Whereby the wireless power signal p120 can be formed.

According to one embodiment, the wireless power signal output circuit 1110 includes at least one inductor and a capacitor, and the wireless power signal output circuit 1110 may be connected to any one of the at least one of the inductors and the capacitors, To form a power signal.

25 shows a case where the radio power signal output circuit 1110 is similar to the oscillation circuit C120 of the LLC resonant converter.

In the case of the above-described induction method, the wireless power signal output circuit 1110 may be a concept corresponding to the passive elements (inductor, capacitor, or other resistance element) and the transmission coil 1111a capable of causing the resonance described above , And in the case of the resonance system (or resonance system), it may be a concept corresponding to the resonance forming circuit 1116 and the transmission coil 1111b.

According to an embodiment of the present invention, the power converter 111 receives the driving signal and generates a carrier signal p110 by switching the supplied DC input voltage on the basis of the driving signal, And a wireless power signal output circuit 1110 for forming the wireless power signal p120 based on the carrier signal p110 generated by the inverter and the carrier signal p110 generated by the inverter.

According to one embodiment, the wireless power signal output circuit 1110 includes at least one inductor and a capacitor, and the wireless power signal output circuit 1110 may be configured to receive the wireless power signal based on the carrier signal and a resonance phenomenon by the at least one inductor and capacitor. Forming.

26 is a configuration diagram illustrating a wireless power transmission apparatus including a plurality of power transmitters according to an embodiment disclosed herein.

In the case of FIG. 26, the wireless power transmission apparatus 100 may include three power transmitters (T100 'to T100' '').

Referring to FIG. 26, each of the three power transmitters T100 'to T100' '' includes a power converter (power converter 1 to power converter 3) and a power transmission controller Transmission control unit 3).

The wireless power transmission apparatus 100 may further include a control unit C100 for controlling three power transmission units (power transmission control unit -1 to power transmission control unit -3).

In this case, the three power transmission units (power transmission control unit 1 to power transmission control unit 3) apply drive signals to each of the three power conversion units (power conversion unit 1 to power conversion unit 3) (Power conversion unit -1 to power conversion unit -3) so that a power signal is generated.

In addition, the controller C100 forms a plurality of (for example, three) wireless power signals having different frequencies based on a plurality of (for example, three) driving signals having different driving frequencies It is possible to control the three power transmission units (power transmission control unit -1 to power transmission control unit -3).

27 is a configuration diagram illustrating a configuration of a wireless power transmission apparatus including a plurality of power transmitters according to another embodiment disclosed herein.

FIG. 27 shows a case where the plurality of power transmitters are three.

According to another embodiment disclosed herein, the wireless power transmission apparatus 100 applies a plurality of driving signals having different driving frequencies to the plurality of power transmitters T100 'to T100' '' And a controller for controlling the plurality of power transmitters T100 'to T100' '' so that a plurality of radio power signals having different frequencies are formed based on the plurality of drive signals.

In this case, the control unit can directly control the power conversion units (the power conversion unit -1 to the power conversion unit -3) included in each of the plurality of power transmitters. Thus, each of the plurality of power transmitters may not include a power transmission control section.

28 is an exemplary diagram illustrating a wireless power transmission method in accordance with one embodiment disclosed herein.

As described above, the wireless power transmission apparatus 100 according to an exemplary embodiment of the present invention includes a plurality of power transmitters that form a plurality of wireless power signals having different frequencies to transmit wireless power to a wireless power receiving apparatus .

In this case, the wireless power receiving apparatus 200 may include a plurality of power receivers capable of receiving each of a plurality of wireless power signals having different frequencies.

28 shows a case where the wireless power transmission apparatus 100 includes three power transmitters Tx1 to Tx3 and the wireless power receiving apparatus 200 includes three power receivers Rx1 to Rx3.

Referring to FIG. 28, the first power transmitter Tx1 may generate a first radio power signal having a first frequency fs1 to transmit radio power having a first power amount to the first power receiver Rx1.

The second power transmitter Tx1 may also form a second radio power signal having a second frequency fs2 to deliver radio power having a second amount of power to the second power receiver Rx2.

Also, the third power transmitter Tx3 may form a third wireless power signal having the third frequency fs3 to deliver the wireless power having the third power amount to the third power receiver Rx3.

According to one embodiment, the three power transmitters Tx1 to Tx3 may form a plurality of radio power signals having different frequencies, respectively.

For example, as in the case of FIG. 28, the first frequency fs1 may be 55 kHz, the second frequency fs2 may be 60 kHz, and the third frequency fs3 may be 65 kHz.

Here, the frequency (e.g., the first frequency, the second frequency or the third frequency) of each of the plurality of wireless power signals is fixed regardless of the load change corresponding to the wireless power receiving apparatus .

Here, the load corresponding to the wireless power receiving apparatus may represent a commonly known meaning in the technical field. For example, the load may mean an impedance corresponding to the wireless power receiving apparatus. Alternatively, the load may mean a power consumed by the wireless power receiving apparatus. Alternatively, the load may mean an amount of a receiving end current flowing to the wireless power receiving apparatus.

As a result, the wireless power transmission apparatus 100 can transmit a maximum amount of the first power, the second power, and the third power to the wireless power receiving apparatus 200.

According to one embodiment, the wireless power transmission apparatus 100 applies a plurality of drive signals having different drive frequencies to a plurality of power transmitters, and generates a plurality of drive signals having different frequencies based on the plurality of drive signals And a controller for controlling the plurality of power transmitters to form a wireless power signal.

Alternatively, the controller may control the power transmission control unit included in the plurality of power transmitters so that a plurality of wireless power signals having different frequencies are formed based on the plurality of driving signals having different driving frequencies.

28, the controller applies a first driving signal (not shown) to the first power transmitter Tx1 to form the first wireless power signal, and the second power transmitter Tx2 (Not shown) to form the second wireless power signal and apply a third driving signal (not shown) to the third power transmitter Tx3 to form the third wireless power signal .

According to one embodiment, the control unit may select one or more power transmitters of the plurality of power transmitters, and control the selected one or more power transmitters to transmit the wireless power by the selected one or more power transmitters.

Here, the selection of one or more power transmitters among the plurality of power transmitters may be based on load information corresponding to the wireless power receiving apparatus.

Here, the load has the same meaning as described above, and the load information may include a value representing the load in numerical form. For example, when the load is represented by the amount of power consumed by the wireless power receiving apparatus 200, the load information may include information that the load corresponding to the wireless power receiving apparatus is 200W.

For example, assuming a total of three wireless power transmission apparatuses 100 capable of accommodating a load of 750 W, the power that the first power transmitter Tx 1 included in the wireless power transmission apparatus 100 will bear is 200 W And the power that the second power transmitter Tx2 may bear 250W and the power that the third power transmitter Tx3 may bear 300W.

In this case, the first power transmitter Tx1, the second power transmitter Tx2, and the third power transmitter Tx3 may generate radio power signals having different frequencies. For example, the first power transmitter Tx1 may generate a wireless power signal having a first frequency fs1 = 55 kHz and the first power transmitter Tx2 may generate a second power fs2 = , And the third power transmitter Tx3 may generate a wireless power signal having a third frequency (fs3 = 65 kHz).

According to an embodiment, the first frequency fs1 to the third frequency fs3 may be fixed regardless of a load change corresponding to the wireless power receiving apparatus.

Although the wireless power transmission apparatus 100 generates a plurality of wireless power signals having different frequencies in this manner and transmits the wireless power to the wireless power receiving apparatus 200, the EMI (Electro Magnetic Interference) An improvement effect may be generated.

In addition, for example, when the load corresponding to the wireless power receiving apparatus 200 has a capacity of 500 W, a controller (not shown) included in the wireless power transmission apparatus 100 controls the three power transmitters Tx1- Tx3) and the third power transmitter (Tx3, 300W burden) by selecting the first power transmitter (Tx1, 200W burden) and the third power transmitter (Tx3, 300W burden) It can be delivered.

According to one embodiment, the selection of a specific power transmitter among the three power transmitters Tx1 to Tx3 may be based on load information corresponding to the wireless power receiving apparatus.

Here, the load information may include at least one of a load condition in a state where the wireless power receiving apparatus 200 is connected to the wireless power transmission apparatus 100, a type of the wireless power receiving apparatus, The power condition, and the rated power of the wireless power receiving apparatus, and the load condition may be a ratio between an impedance in a state connected to the wireless power transmission apparatus and a total impedance that the wireless power receiving apparatus can have.

The load condition may be an impedance value corresponding to the wireless power receiving apparatus 200. For example, when the load corresponding to the wireless power receiving apparatus 200 is Ro in the general resonant converter described above, the load condition may be 1k [ohm].

In addition, the load condition may indicate a ratio between an impedance in a state connected to the wireless power transmission apparatus and a total impedance that the wireless power reception apparatus can have. For example, if the wireless power receiving apparatus 200 has a load of 1 k [ohm] capable of being connected to the wireless power transmission apparatus 100, The load corresponding to the wireless power receiving apparatus 200 may be 500 [ohm] if the load is 1 k [ohm] and the load condition is 50%.

In addition, the type of the wireless power receiving apparatus 200 may indicate the type of the wireless power receiving apparatus 200. For example, the wireless power receiving apparatus 200 may be a mobile terminal or a notebook computer.

The wireless power transmission apparatus 100 can obtain the rated load conditions of the wireless power receiving apparatus 200 based on the device type of the wireless power receiving apparatus 200. [

The amount of radio power to be delivered to the wireless power receiving apparatus 200 and the rated power of the wireless power receiving apparatus may be 5 W or 10 W, for example.

According to one embodiment, the wireless power receiving apparatus 100 may be a need to obtain the load information.

Here, the load information may be obtained in various manners.

According to one embodiment, the load information may be obtained from the wireless power receiving apparatus 200.

According to another embodiment of the present invention, the wireless power transmission apparatus 100 may further include a load information generating unit 110 for generating a wireless power signal based on the amount of current flowing in the power converting unit 111 included in each of the plurality of power transmitters, ≪ / RTI >

For example, when the amount of current flowing in the power conversion unit 111 is reduced by 10%, the wireless power transmission apparatus 100 can recognize that the load corresponding to the wireless power reception apparatus 200 is reduced by 10% .

A wireless power transmission device comprising a variable power transmitter

A wireless power transmission apparatus according to an exemplary embodiment of the present invention includes a plurality of power transmitters for transmitting a wireless power to a wireless power receiving apparatus by forming a plurality of wireless power signals having different frequencies, The apparatus may include a plurality of power receivers capable of receiving each of a plurality of radio power signals having the different frequencies.

Also, according to one embodiment, the plurality of power transmitters may include a variable power transmitter that transmits a wireless power by forming a variable wireless power signal based on a power control parameter.

In addition, the wireless power transmission apparatus adjusts the power control parameter based on load information corresponding to the wireless power receiving apparatus, and forms the variable wireless power signal based on the adjusted power control parameter And a controller for controlling the variable power transmitter to adjust the amount of radio power transmitted to the wireless power receiving apparatus.

According to yet another embodiment, a wireless power transmission apparatus includes a variable power transmitter for forming a first wireless power signal based on a power control parameter to transmit wireless power to a wireless power receiving apparatus, a second wireless power having a fixed frequency And a controller for controlling the power control parameter based on load information corresponding to the wireless power receiving apparatus and for controlling the variable power transmitter or the fixed And a controller for selectively activating or deactivating the power transmitter to adjust the amount of radio power transmitted to the wireless power receiving apparatus.

Here, the number of the fixed power transmitters may be plural, and the frequencies of the radio power signals formed by each of the plurality of fixed power transmitters may be different.

The power control parameter may be at least one of a frequency of the variable wireless power signal, a duty-cycle of the variable wireless power signal, and a DC power source supplied to the variable power transmitter.

The load information may be obtained from the wireless power receiving apparatus.

The load information may be at least one of a load condition of the wireless power receiving apparatus, a type of the wireless power receiving apparatus, a wireless power amount to be received by the wireless power receiving apparatus, and a rated power of the wireless power receiving apparatus have.

The load condition may be a ratio between an impedance of the wireless power receiving apparatus or an impedance of the wireless power receiving apparatus connected to the wireless power transmitting apparatus and a total impedance the wireless power receiving apparatus can have .

29 is an exemplary diagram illustrating a wireless power transmission apparatus including a variable power transmitter according to an embodiment disclosed herein;

Referring to FIG. 29, a wireless power transmission apparatus 100 according to an embodiment disclosed herein may include one variable power transmitter Tx1 and three fixed power transmitters Tx2 through Tx4.

The variable power transmitter Tx1 may form a first wireless power signal based on the power control parameter and transmit the wireless power to the wireless power receiving apparatus 200. [

Here, the power control parameter may be at least one of a frequency of the first wireless power signal, a duty-cycle of the first wireless power signal, and a DC power supplied to the variable power transmitter.

In this case, the wireless power transmission apparatus 100 may adjust the power control parameter, and the variable power transmitter Tx1 may form the first wireless power signal based on the adjusted power control parameter. More specifically, the first wireless power signal may be formed by a power conversion unit included in the variable power transmitter Tx1.

For example, the wireless power transmission apparatus 100 may adjust (or vary) the frequency of the first wireless power signal among the power control parameters. In this sense, the first wireless power signal may be the variable wireless power signal described above.

Further, due to the adjustment of the power control parameter, the variable power transmitter Tx1 may have a function of varying the transmission power (or transmission capacity). For example, due to the adjustment of the power control parameter, the variable power transmitter (Tx1) can adjust the transmission power in the range of 0 to 250W.

According to one embodiment, each of the three fixed power transmitters Tx2 to Tx4 may form (or generate) a wireless power signal having a different frequency.

In this case, each of the three fixed power transmitters Tx2 to Tx4 may generate a fixed wireless power signal having a different frequency.

In addition, the wireless power transmission apparatus 100 may acquire load information corresponding to the wireless power receiving apparatus 200, adjust the power control parameter based on the load information, The amount of radio power transmitted to the wireless power receiving apparatus can be adjusted by selectively activating or deactivating the wireless power receiving apparatus. The load information is as described above.

For example, when the transmission power amount of the variable power transmitter Tx1 is 0 to 250 W and the transmission power amount of each of the three fixed power transmitters Tx2 to Tx4 is fixed to 200 W, Sets the amount of power transmitted by the variable power transmitter to 50W by adjusting the power control parameter (e.g., the frequency of the first wireless power signal), and sets 2 of the three fixed power transmitters (Tx2 to Tx4) So that the total amount of power delivered to the wireless power receiving apparatus 200 is 450 W. [

In this case, since the frequencies of the three radio power signals generated by the two fixed power transmitters of the variable power transmitter and the three fixed power transmitters Tx2 to Tx4 are different from each other, It is possible to prevent the phenomenon of concentrating on the frequency, thereby improving the EMI.

Specifically, with reference to Fig. 29, a wireless power transmission method according to an embodiment disclosed herein will be described. In the case of a wireless power transmission apparatus composed of a total of four power transmitters that cover a load of 1 kW capacity, The capacity that each transmitter will bear is 250W.

One variable power transmitter (Tx1) operating in all the load regions of the four power transmitters can operate in a load range of 0 to 250 W. At this time, the wireless power transmission apparatus 100 changes a power control parameter (for example, a frequency of a wireless power signal) corresponding to the variable power transmitter to change (or control) the amount of wireless power transmitted by the variable power transmitter )can do.

For example, the frequency of the wireless power signal (or the first wireless power signal) formed in the variable power transmitter Tx1 may be adjusted in the range of 20 to 60 kHz.

In this case, the switching frequency (or the driving frequency of the driving signal corresponding to the variable power transmitter) may be varied based on the resonance frequency.

The remaining three power transmitters (Tx2 to Tx4) can operate only in the full load region of 250 W each, and the switching frequency can be fixed at the resonance frequency.

The operation of the load condition will be described below.

First, when the variable power transmitter operating in all load regions is 1, and the three fixed power transmitters operating in the remaining full load region are 2, 3 and 4, when the load condition is 100 W, 100) can operate only the first device at 100W.

Also, when the load condition is 300W, the wireless power transmission apparatus 100 can operate the first apparatus at 50W and the second apparatus at 250W.

Also, when the load condition is 550W, the wireless power transmission apparatus 100 can operate the first apparatus at 50W and the second and third apparatus at 250W, respectively.

In addition, when the load condition is 850W, the device No. 1 can operate at 100W, the devices No. 2, No. 3 and No. 4 can operate at 250W respectively.

 In this case, the devices # 2, # 3 and # 4 are designed to operate at the resonant frequency under the full load condition, so that they can always show optimum efficiency characteristics in operation.

In case of No. 1 device, resonant frequency and switching frequency range can be designed according to designer's intention and product characteristic.

Also, when the resonance frequencies of the second, third, and fourth devices are designed to be different from each other, the concentration of EMI in one switching frequency can be prevented, and the EMI problem can be improved.

 In addition, in the method disclosed in the present specification, in which the load is divided by a plurality of devices, the voltage and current specifications of various devices used in the circuit are alleviated, and the device selection and the price burden It may be advantageous to reduce the cost of the system.

 In addition, in the method disclosed in the present specification, in which the load is divided by a plurality of devices, the current density flowing in the circuit is reduced, and the TX (transmission), RX It may be advantageous to reduce the burden on the volume.

A brief summary of the advantages of the method disclosed herein is as follows.

The technique disclosed in the present specification can solve the problem of a resonant converter having low efficiency characteristics that are uneven in all-region load conditions.

It can also reduce EMI problems that are becoming more severe in high-power wireless power transmission devices.

In addition, it is possible to improve the burden on selection of elements of high voltage and current specification of high price used in a high power wireless power transmission apparatus.

It also can improve the burden on large volume equipment used in high power wireless power transmission devices.

A brief description of the features of the method disclosed herein is as follows.

The high power wireless power transmission apparatus may be composed of a plurality of power transmitters each of which shares the total power capacity.

In addition, one of the plurality of power transmitters may operate in a load condition of all areas, and the remaining plurality of power transmitters may always operate at full load.

In addition, the remaining plurality of power transmitters operating only at full load have different resonant frequencies and can operate with a fixed switching frequency.

In addition, the variable power transmitter operating under all the load conditions can operate with the switching frequency varying based on the resonance frequency.

Further, each of the operation ports can be set and controlled in accordance with a load range in which a plurality of power transmitters operate.

30 is an exemplary diagram illustrating an application to which a wireless power transmission method according to an embodiment disclosed herein may be applied.

Referring to FIG. 30 (a), a wireless power transmission method according to an embodiment disclosed herein can be applied between a transmitter including four power transmitters and an image display including four power receivers.

For example, the video display device may be a smart phone, a portable terminal, a mobile terminal, a personal digital assistant (PDA), a portable multimedia player (PMP) A computer, a Wibro terminal, an IPTV terminal, a digital broadcasting terminal, a telematics terminal, a navigation terminal, an AVN (Audio Video Navigation) terminal, a television, a 3D television, An audio / video (V) system, a home theater system, an information providing center, a call center, and the like.

Referring to FIG. 30 (b), a wireless power transmission method according to an embodiment disclosed herein can be applied to a transmission including four power transmitters and an electric vehicle including four power receivers.

Here, the transmitting unit including the four power transmitters may be located on a surface facing the bottom of the electric car, and the four electric power receivers may be disposed at a lower portion of the electric car to receive radio power from each of the four electric power transmitters Can be installed (or positioned).

31 is a graph illustrating a comparison of transmission efficiency between a wireless power transmission apparatus and an existing wireless power transmission apparatus according to an embodiment disclosed herein.

Referring to FIG. 31, in the case of a wireless power transmission apparatus having four power transmitters (or four modules), compared with a wireless power apparatus having only one (or one module) .

32 is a graph comparing EMI performance between a wireless power transmission apparatus and an existing wireless power transmission apparatus according to an embodiment disclosed herein.

Referring to FIG. 32, in the case of a wireless power transmission apparatus having four power transmitters (or four modules), compared to a wireless power apparatus having only one (or one module) Power signal) is not concentrated on a specific frequency.

Examples applied to high-power wireless power transmission devices - Electric vehicles

Hereinafter, an example in which the wireless power transmission method disclosed in this specification is applied to a high power wireless power transmission apparatus and a wireless power reception apparatus will be described with reference to FIG.

In particular, the high power wireless power receiving device may be an electric vehicle (EV).

33 is an exemplary diagram showing an example in which the wireless power transmission method disclosed in this specification is applied to an electric vehicle;

Referring to FIG. 33, load status information of a battery is read through a battery management system (BMS) of an electric vehicle (EV) ).

In addition, the Micom can transmit information to a communication device at a transmitter through a communication device at a receiver.

In this case, the communication apparatus of the transmission end transmits a power control signal to Tx1 and an ON / OFF control signal to Tx2, Tx3, and Tx4.

 At this time, the ON / OFF control signal and the power control signal can be determined by Micom according to the load status information read from the BMS.

The power control signal may be used in various control methods such as frequency control, duty control, frequency-duty control, voltage control, and current control.

The work disclosed herein In the embodiment  Wireless power transmission method according to

A wireless power transmission method according to an embodiment disclosed herein includes generating a first wireless power signal based on a power control parameter to deliver wireless power to a wireless power receiving device, And transmitting the wireless power to the wireless power receiving apparatus by adjusting a power control parameter based on load information corresponding to the wireless power receiving apparatus, And controlling the amount of radio power transmitted to the wireless power receiving apparatus by selectively activating or deactivating the wireless power receiving apparatus.

Further, according to an embodiment, the load information may be obtained from the wireless power receiving apparatus.

According to an embodiment, the load information includes at least one of a load condition of the wireless power receiving apparatus, a type of the wireless power receiving apparatus, a wireless power amount to be transmitted to the wireless power receiving apparatus, Lt; / RTI >

Further, according to an embodiment, the load condition may be a condition between an impedance of the wireless power receiving apparatus or an impedance in a state where the wireless power receiving apparatus is connected to the wireless power transmitting apparatus and a total impedance that the wireless power receiving apparatus can have Ratio.

According to an embodiment, the power control parameter may include at least one of a frequency of the first wireless power signal, a duty-cycle of the first wireless power signal, and a DC power supplied to the variable power transmitter, It may be one.

34 is a flow diagram illustrating a wireless power transmission method in accordance with one embodiment disclosed herein.

Referring to FIG. 34, a wireless power transmission method according to an embodiment disclosed herein may include the following steps.

First, the wireless power transmission apparatus may form a first wireless power signal based on a power control parameter and transmit wireless power to the wireless power reception apparatus (S110).

Next, the wireless power transmission apparatus may form a second wireless power signal having a fixed frequency to transmit wireless power to the wireless power reception apparatus (S120).

Next, the wireless power transmission apparatus adjusts the power control parameter based on load information corresponding to the wireless power receiving apparatus, selectively activates or deactivates the variable power transmitter or the fixed power transmitter, The amount of radio power transmitted to the wireless power receiving apparatus can be adjusted (S130).

According to the above-described wireless power transmission apparatus, a variable power transmitter capable of transmitting a variable power and at least one fixed power transmitter transmitting a fixed power, so that a load fluctuation (or variation) corresponding to a wireless power receiving apparatus, It is possible to efficiently control the amount of transmission power and to generate a plurality of wireless power signals having different frequencies, thereby improving the EMI.

In addition, the technique disclosed herein is directed to a control method that improves EMI problems with uniform and high efficiency characteristics under all regions of load conditions, and reduces the burden on device selection and tool volume.

In addition, a plurality of power transmitters share the entire load capacity, one device operates with the switching frequency varying in all the load regions, and the remaining plurality of devices can operate with the switching frequency fixed to the resonance frequency only in the entire load region have. At this time, the remaining plurality of devices may be set to different resonance frequencies.

By doing so, it is possible to solve the problem that the high power wireless power transmission apparatus using the resonant converter has unevenness and low efficiency characteristics under all the load conditions, and the EMI problem can be improved because it has different resonance frequencies.

It may also be advantageous to reduce the current density of the current flowing in the device, thereby reducing the burden on the coil and the volume of the devices.

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

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

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

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

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

100: wireless power transmission apparatus 200: wireless power receiving apparatus
110: power transfer unit 290: power supply unit

Claims (27)

A plurality of power transmitters for forming a plurality of wireless power signals having different frequencies to transmit wireless power to a wireless power receiving device,
The wireless power receiving apparatus includes:
And a plurality of power receivers capable of receiving each of the plurality of radio power signals having the different frequencies. 2. The apparatus of claim 1, wherein each of the plurality of power transmitters comprises:
A power supply unit for supplying DC input power; And
And a power conversion unit that forms any one of the plurality of radio power signals based on the switching operation by the supplied DC input power and the driving signal. 3. The method of claim 2, wherein the frequency of any one of the wireless power signals
Wherein the driving signal is determined based on a driving frequency of the driving signal. The power conversion apparatus according to claim 2,
An inverter for generating a carrier signal based on the switching operation based on the driving signal and the supplied DC input power; And
And a wireless power signal output circuit for forming the one of the wireless power signals based on the carrier signal generated by the inverter. 5. The wireless power supply circuit according to claim 4,
At least one inductor and a capacitor,
And forms the one of the radio power signals based on the carrier signal and a resonance phenomenon caused by the at least one inductor and the capacitor. 3. The apparatus of claim 2, wherein each of the plurality of power transmitters comprises:
And a power transmission control unit for controlling the power conversion unit so that any one of the wireless power signals is generated by applying the driving signal to the power conversion unit. The method according to claim 6,
Further comprising a controller for controlling a power transmission control unit included in the plurality of power transmitters so that a plurality of wireless power signals having different frequencies are formed based on a plurality of drive signals having different drive frequencies Wireless power transmission device. 3. The method of claim 2,
Applying a plurality of drive signals having different drive frequencies to the plurality of power transmitters,
Further comprising a controller for controlling the plurality of power transmitters to form a plurality of wireless power signals having different frequencies based on the plurality of drive signals. 2. The method of claim 1, wherein the frequency of each of the plurality of wireless power signals,
And is fixed regardless of a load change corresponding to the wireless power receiving apparatus. The method according to claim 1,
Further comprising: a controller for controlling the selected one or more power transmitters to transmit the wireless power by the selected one or more power transmitters of the plurality of power transmitters. 11. The method of claim 10,
Wherein the selection of the one or more power transmitters of the plurality of power transmitters comprises:
And load information corresponding to the wireless power receiving apparatus. 2. The apparatus of claim 1, wherein the plurality of power transmitters comprise:
And a variable power transmitter configured to form a variable wireless power signal based on a power control parameter to transmit wireless power,
The wireless power transmission apparatus includes:
Controls the power control parameter based on load information corresponding to the wireless power receiving apparatus,
And a control unit for controlling the variable power transmitter so that the amount of radio power transmitted to the wireless power receiving apparatus is adjusted by forming the variable wireless power signal based on the adjusted power control parameter, . 13. The method of claim 12,
The frequency of the variable wireless power signal, the duty-cycle of the variable wireless power signal, and the DC power supplied to the variable power transmitter. 13. The method as claimed in claim 11 or 12,
Wherein the wireless power receiving apparatus is obtained from the wireless power receiving apparatus. 13. The method as claimed in claim 11 or 12,
The load condition of the wireless power receiving apparatus, the type of the wireless power receiving apparatus, the amount of wireless power to be delivered to the wireless power receiving apparatus, and the rated power of the wireless power receiving apparatus. 16. The method of claim 15,
Wherein the ratio of the impedance of the wireless power receiving apparatus to the impedance of the wireless power receiving apparatus connected to the wireless power transmitting apparatus and the total impedance the wireless power receiving apparatus can have. A variable power transmitter configured to form a first wireless power signal based on a power control parameter to deliver wireless power to a wireless power receiving device;
A fixed power transmitter for forming a second wireless power signal having a fixed frequency and delivering wireless power to the wireless power receiver; And
And a control unit for controlling the power control parameter based on load information corresponding to the wireless power receiving apparatus, selectively activating or deactivating the variable power transmitter or the fixed power transmitter, And a control unit for adjusting the amount of power. 18. The apparatus of claim 17, wherein the fixed power transmitter comprises:
Plural,
Wherein the frequency of the wireless power signals formed by each of the plurality of fixed power transmitters is different. 18. The method of claim 17,
Wherein the wireless power receiving apparatus is obtained from the wireless power receiving apparatus. 18. The method of claim 17,
The load condition of the wireless power receiving apparatus, the type of the wireless power receiving apparatus, the amount of wireless power to be delivered to the wireless power receiving apparatus, and the rated power of the wireless power receiving apparatus. 21. The method of claim 20,
Wherein the ratio of the impedance of the wireless power receiving apparatus to the impedance of the wireless power receiving apparatus connected to the wireless power transmitting apparatus and the total impedance the wireless power receiving apparatus can have. 18. The method of claim 17,
The frequency of the first wireless power signal, the duty-cycle of the first wireless power signal, and the DC power supplied to the variable power transmitter. Forming a first wireless power signal based on the power control parameter to deliver wireless power to the wireless power receiving device;
Forming a second wireless power signal having a fixed frequency to deliver wireless power to the wireless power receiving device; And
And a control unit for controlling the power control parameter based on load information corresponding to the wireless power receiving apparatus, selectively activating or deactivating the variable power transmitter or the fixed power transmitter, And adjusting the amount of power. The information processing apparatus according to claim 23,
Wherein the wireless power receiving apparatus is obtained from the wireless power receiving apparatus. The information processing apparatus according to claim 23,
The load condition of the wireless power receiving apparatus, the type of the wireless power receiving apparatus, the amount of wireless power to be delivered to the wireless power receiving apparatus, and the rated power of the wireless power receiving apparatus. 26. The method of claim 25,
Wherein the ratio of the impedance of the wireless power receiving apparatus to the impedance of the wireless power receiving apparatus connected to the wireless power transmitting apparatus and the total impedance the wireless power receiving apparatus can have. 24. The apparatus of claim 23, wherein the power control parameter comprises:
The duty cycle of the first wireless power signal, and the dc power supplied to the variable power transmitter.

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