KR20130005571A - Wireless power transmitter and wireless power receiver having fuction of resonance frequency control - Google Patents

Abstract

In the present specification, the wireless power transmitter or the wireless power receiver includes a variable capacitor and / or a variable inductor that can be selectively operated, thereby adaptively adjusting the resonant frequency of the transmitter or the receiver to maximize the power transmission efficiency. A transmitter and a wireless power receiver. To this end, the wireless power transmitter according to an embodiment of the present disclosure forms a wireless power signal for resonant coupling with a wireless power receiver, and the power conversion for receiving the wireless power signal modulated by the wireless power receiver. part; And a transmission controller configured to detect a change in electrical characteristics of the power converter based on the modulated wireless power signal, and output a control signal for changing a resonance frequency in the power converter based on the sensed change in electrical characteristics. The power converter includes a plurality of variable capacitors; And a frequency adjusting unit adjusting the resonance frequency of the power converter by selectively operating each of the plurality of variable capacitors according to the control signal.

Description

WIRELESS POWER TRANSMITTER AND WIRELESS POWER RECEIVER HAVING FUCTION OF RESONANCE FREQUENCY CONTROL}

The present disclosure relates to a wireless power transmitter and a wireless power receiver, and more particularly, to a wireless power transmitter and a wireless power receiver having a function of adjusting a resonance frequency.

Traditionally, instead of supplying electrical energy by wire to electronic devices, a method of supplying electrical energy wirelessly without contact is recently used. An electronic device that wirelessly receives energy may be directly driven by the received wireless power, or may be charged by using the received wireless power and driven by the charged power.

Meanwhile, on April 12, 2010, the Wireless Power Consortium published "Wireless Power Transfer System Guide, Volume 1, Low Power, Part 1: Interface Definitions, Version 1.00, for interoperability in wireless power transfer." "RC1 (System Description Wireless Power Transfer, Volume 1, Low Power, Part 1: Interface Definition, Version 1.00 Release Candidate 1)" standard document.

In the present specification, the wireless power transmitter or the wireless power receiver includes a variable capacitor and / or a variable inductor that can be selectively operated, thereby adaptively adjusting the resonant frequency of the transmitter or the receiver to maximize the power transmission efficiency. It is a technical problem to provide a transmitter and a wireless power receiver.

According to one or more exemplary embodiments, a wireless power transmitter includes a power converter configured to form a wireless power signal for resonant coupling with a wireless power receiver, and receive a wireless power signal modulated by the wireless power receiver; And a transmission controller configured to detect a change in electrical characteristics of the power converter based on the modulated wireless power signal, and output a control signal for changing a resonance frequency in the power converter based on the sensed change in electrical characteristics. The power converter includes a plurality of variable capacitors; And a frequency adjusting unit adjusting the resonance frequency of the power converter by selectively operating each of the plurality of variable capacitors according to the control signal.

In an embodiment, each of the plurality of variable capacitors is connected to be operable in parallel.

In an embodiment, each of the plurality of variable capacitors may include a switch and a capacitor connected to each other in series.

The apparatus may further include a demodulator for demodulating the modulated wireless power signal and decoding a packet from the demodulated wireless power signal, wherein the transmission controller is configured to resonate a frequency of the wireless power receiver from the decoded packet. It is characterized in that for detecting.

In an embodiment, the transmission controller may detect a change in the electrical characteristic by comparing the current or voltage detected by the power converter with a reference value.

In addition, the wireless power receiver according to an embodiment of the present disclosure, a power receiving unit for receiving a wireless power signal for resonance coupling from the wireless power transmission apparatus; And a reception controller configured to detect a change in electrical characteristics of the power receiver based on the received wireless power signal, and output a control signal for changing a resonance frequency of the power receiver based on the detected change in electrical characteristics. The power receiver may include a plurality of variable capacitors; And a frequency controller configured to selectively adjust the resonance frequency of the power receiver by selectively operating each of the plurality of variable capacitors according to the control signal.

In an embodiment, each of the plurality of variable capacitors may be connected to be operable in parallel.

In an embodiment, each of the plurality of variable capacitors may include a switch and a capacitor connected to each other in series.

The apparatus may further include a demodulator for demodulating the wireless power signal and decoding a packet from the demodulated wireless power signal, wherein the reception controller detects a resonance frequency of the wireless power transmitter from the decoded packet. Characterized in that.

In addition, in one embodiment, the reception control unit may detect a change in the electrical characteristic by comparing the current or voltage detected by the power reception unit with a reference value.

In addition, the wireless power transmitter according to another embodiment of the present disclosure, the power to form a wireless power signal for resonant coupling with the wireless power receiver, and receives the wireless power signal modulated by the wireless power receiver A conversion unit; And a transmission controller configured to detect a change in electrical characteristics of the power converter based on the modulated wireless power signal, and output a control signal for changing a resonance frequency in the power converter based on the sensed change in electrical characteristics. The power converter includes a plurality of variable inductors; And a frequency adjuster configured to adjust the resonance frequency of the power converter by selectively operating each of the plurality of variable inductors according to the control signal.

In an exemplary embodiment, each of the plurality of variable inductors may be connected to be operable in series.

In an embodiment, each of the plurality of variable inductors may include at least one switch and an inductor connected in series to be operable in series.

The apparatus may further include a demodulator for demodulating the modulated wireless power signal and decoding a packet from the demodulated wireless power signal, wherein the transmission controller is configured to resonate a frequency of the wireless power receiver from the decoded packet. It is characterized in that for detecting.

In an embodiment, the transmission controller may detect a change in the electrical characteristic by comparing the current or voltage detected by the power converter with a reference value.

In addition, the wireless power receiver according to another embodiment of the present disclosure, a power receiver for receiving a wireless power signal for resonance coupling from the wireless power transmission apparatus; And a reception controller configured to detect a change in electrical characteristics of the power receiver based on the received wireless power signal, and output a control signal for changing a resonance frequency of the power receiver based on the detected change in electrical characteristics. The power receiver may include a plurality of variable inductors; And a frequency adjuster configured to adjust the resonance frequency of the power converter by selectively operating each of the plurality of variable inductors according to the control signal.

In an exemplary embodiment, each of the plurality of variable inductors may be connected to be operable in series.

In an embodiment, each of the plurality of variable inductors may include at least one switch and an inductor connected in series to be operable in series.

The apparatus may further include a demodulator for demodulating the wireless power signal and decoding a packet from the demodulated wireless power signal, wherein the reception controller detects a resonance frequency of the wireless power transmitter from the decoded packet. Characterized in that.

In addition, in one embodiment, the reception control unit may detect a change in the electrical characteristic by comparing the current or voltage detected by the power reception unit with a reference value.

According to the embodiments disclosed herein, by using a variable capacitor and / or a variable inductor to maintain the same resonant frequency of the transmitting end and the receiving end in a wireless power transmission and reception system, the selectivity or resonant frequency according to the distance between the transmitting end and the receiving end You can solve problems that change. Accordingly, there is an advantage that can maximize power transmission efficiency at low cost.

1 is an exemplary view conceptually illustrating a wireless power transmitter and an electronic device according to embodiments of the present disclosure.
2 (a) and 2 (b) are block diagrams illustrating the configurations of the wireless power transmitter 100 and the electronic device 200 employable 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 illustrating a part of a configuration of an electromagnetic induction wireless power transmitter 100 and an electronic device 200 that may be employed in the embodiments disclosed herein.
FIG. 5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to an inductive coupling scheme that may be employed 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.
FIG. 7 is a block diagram exemplarily illustrating a part of a configuration of a wireless power transmitter 100 and an electronic device 200 of a resonance type that may be employed in the embodiments disclosed herein.
FIG. 8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power in accordance with a resonant coupling scheme employable in 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.
12 illustrates a method of displaying data bits and bytes in which the wireless power transmitter 100 configures a power control message.
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 a conceptual diagram illustrating a resonant frequency in a wireless power transmission / reception system according to an exemplary embodiment disclosed herein.
21A to 21C are conceptual views illustrating a technique of dynamically changing a resonance frequency of the wireless power transmitter 100 or the electronic device 200 according to the embodiments disclosed herein, respectively.
22A is a flowchart illustrating a process of determining a resonance frequency by the wireless power transmitter 100 according to the exemplary embodiments disclosed herein.
22B is a flowchart illustrating a process of determining a resonant frequency by the electronic device 200 according to embodiments of the present disclosure.
FIG. 23A is a flowchart illustrating a process of determining a resonance frequency by the wireless power transmitter 100 according to the exemplary embodiments disclosed herein.
FIG. 23B is a flowchart illustrating a process of determining a resonance frequency by the electronic device 200 according to embodiments of the present disclosure.

The techniques disclosed herein apply to contactless power transfer. However, the technology disclosed herein is not limited thereto, and may be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and devices using wirelessly transmitted power to which the technical spirit of the technology may 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, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or some steps It should be construed that it may not be included or may further include 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.

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.

Referring to FIG. 2A, the wireless power transmitter 100 is configured to include a power transmission unit 110. 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 wireless power signal transmitted by the power converter 111 is formed in the form of a magnetic field or an electromagnetic field having an oscillation characteristic. To this end, the power converter 111 may be configured to include a coil for generating the wireless power signal.

The power converter 111 may include a component for forming a wireless power signal of a different type 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 addition, in some embodiments, the power converter 111 is configured to include a coil (or antenna) for forming a magnetic field having a specific resonance frequency in order to generate a resonance phenomenon in the electronic device 200 according to the resonance coupling method. Can be.

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.

Among the components included in the power converter 111, those that follow the inductive coupling method will be described below with reference to FIGS. 4 and 5, and those that follow the resonance coupling method with reference to FIGS. 7 and 8.

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, and other control based on the power control message. You can perform the operation.

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 transmitter 100 may perform a general control operation related to wireless power transfer 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 transmitter 100 may further include a power demodulation / demodulation unit 113 electrically connected to the power converter 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 converter 111 to receive a power control message using a wireless power signal will be described below with reference to FIGS. 11 to 13.

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

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 receiver 291 receives power transmitted wirelessly from the wireless power transmitter 100.

The power receiver 291 may include components required to receive the wireless power signal according to a wireless power transfer method. In addition, the power receiver 291 may receive power according to one or more wireless power transfer schemes. In this case, the power receiver 291 may include components required for each scheme.

First, the power receiver 291 may be configured to include a coil for receiving a wireless power signal transmitted in the form of a magnetic or electromagnetic field having a vibrating 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 of the components included in the power receiver 291 that follow the inductive coupling method will be described below with reference to FIG. 4.

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 each component included in the power supply unit 290.

In detail, the power reception control unit 292 may transmit a power control message to the wireless power transmitter 100. The power control message may instruct the wireless power transmitter 100 to start or end the transmission of the wireless power signal. In addition, the power control message may instruct the wireless power transmitter 100 to adjust 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 modulation and demodulation unit 293 may be used to transmit the power control message through the wireless power signal as in the case of the wireless power transmitter 100 described above. The modulation and demodulation unit 293 may be used as a means for adjusting a current and / or a voltage flowing through the power converter 111 of the wireless power transmitter 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 converter 111 is received by the power receiver 291. In this case, the power reception control unit 292 controls the modulation and demodulation unit 293 on the electronic device 200 side to modulate the wireless power signal. For example, the power reception control unit 292 may perform a modulation process so that the amount of power received from the wireless power signal is changed by changing the reactance of the modulation and demodulation unit 293 connected to the power reception unit 291. 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 demodulation unit 113 on the side of the wireless power transmitter 100 senses a change in current and / or voltage of the power converter 111 and performs a demodulation process.

That is, the power reception control unit 292 generates a packet including a power control message to be transmitted to the wireless power transmitter 100 to modulate the wireless power signal to include the packet, and the power The transmission control unit 112 may obtain the power control message included in the packet by decoding the packet based on a result of performing the demodulation process of the modulation / demodulation unit 113. A detailed method of obtaining the power control message by the wireless power transmitter 100 will be described later with reference to FIGS. 11 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.

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

First, a method of transmitting power to the electronic device by the wireless power transmitter according to embodiments supporting the inductive coupling method with reference to FIGS. 3 to 5 is disclosed.

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 method, the power converter 111 of the wireless power transmitter 100 is configured to include a transmission coil (Tx coil) 1111a that acts 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.

4 is a block diagram exemplarily illustrating a part of a configuration of an electromagnetic induction type wireless power transmitter 100 and an electronic device 200 that may 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 converter 111 of the wireless power transmitter 100 may be configured to include a transmission coil (Tx coil) 1111a and an inverter 1112.

As described above, the transmitting coil 1111a forms a magnetic field corresponding to the wireless power signal according to the change of the 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 configured to further include a positioning unit 1114.

The positioning unit 1114 may move or rotate the transmitting coil 1111a to increase the efficiency of wireless power transfer by the inductive coupling method. 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.

The current is induced in the receiving coil 2911a by the change in the magnetic field formed from the transmitting 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 increase reception efficiency of 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 rectifier circuit 2913 performs full-wave rectification on the current to convert an alternating current into a direct current. The rectifier circuit 2913 may be implemented as, for example, a full bridge rectifier circuit consisting of four diodes or a circuit using active components.

In addition, the rectifier circuit 2913 may further include a smoothing circuit (regulator) to make the rectified current to a more flat and stable direct current. In addition, the output power of the rectifier circuit 2913 is supplied to each component of the power supply 290. In addition, the rectifier circuit 2913 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 such as the charging unit 298). (DC-DC converter) may further include.

The modulation and demodulation unit 293 is connected to the power receiver 291, and may be configured as a resistive element having a change in resistance with respect to a DC current, and configured as a capacitive element having a reactance with respect to an alternating current. Can be. The power reception control unit 292 may modulate the wireless power signal received by the power reception unit 291 by changing the resistance or reactance of the modulation and demodulation 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.

FIG. 5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to an inductive coupling scheme that may be employed 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 transmitting coils 1111a-1 to 1111a-n may be an array of partly overlapping primary coils. An active area may be determined by some of the one or more transmitting coils.

The one or more transmitting coils 1111a-1 to 1111a-n may be mounted below the interface surface. In addition, the power converter 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 . In this case, a single transmitting coil or a combination of one or more transmitting coils 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. 8.

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 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 a periodic external force having the same frequency as its natural frequency, and the amplitude increases markedly. Resonance is a phenomenon that occurs in all vibrations, including mechanical and electrical vibrations. In general, when a force capable of vibrating the vibration system from the outside, if the natural frequency of the vibration system and the frequency of the force applied from the outside is the same, the vibration is severe and the amplitude is also large.

In the same principle, when a plurality of vibrating bodies that are separated within a certain distance vibrate at the same frequency with each other, the plurality of vibrating bodies resonate with each other, in which case the resistance between the plurality of 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 transmitter 100 follows the resonance coupling method, the magnetic field having a specific vibration frequency is formed by the AC power 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.

The principle of the resonance coupling method will be described in detail. In general, a method of generating electromagnetic waves and transmitting power may have low power transmission efficiency, and may adversely affect a human body based on the radiation and exposure of the electromagnetic waves.

However, as described above, when the plurality of vibrators electromagnetically resonate with each other, power transmission efficiency may be very high because they are not affected by the peripheral objects other than the plurality of vibrators. 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, in general, since the human body is sensitive to the electric field and insensitive to the magnetic field, transmitting power using magnetic resonance may reduce the adverse effects of the human body due to the exposure of electromagnetic waves. In addition, an energy tail is formed due to the resonance, and thus the power transmission form is 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 may 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 transmitter 100 may be obtained by using Equation 1 with LTx and 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.

FIG. 7 is a block diagram exemplarily illustrating a part of a configuration of a wireless power transmitter 100 and an electronic device 200 of a resonance type that may be employed in the embodiments disclosed herein.

A configuration of the power transmitter 110 included in the wireless power transmitter 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 transmitting coil 1111b may be mounted separately from the transmitting coil 1111a for transmitting power according to the inductive coupling method, but may also be configured to transmit power in an inductive coupling method and a resonance coupling method using one single coil.

The transmitting coil 1111b forms a magnetic field for transferring 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 converter 111 may be configured to further include a frequency adjuster 1117 for changing the resonance frequency value of the power converter 111. Since the resonant frequency of the power converter 111 is determined based on inductance and capacitance in the circuit constituting the power converter 111 by Equation 1, the power transmission controller 112 is the inductance and / or The resonance frequency of the power converter 111 may be determined by controlling the frequency adjusting unit 1117 to change the capacitance.

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. In addition, in some embodiments, the frequency adjusting unit 1117 may be configured to include a motor that can change the inductance by adjusting the number of turns or 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 receiver 291 of the power supply unit 290 may be configured to further include a rectifier circuit 2913 for converting the alternating current generated by the resonance phenomenon into a direct current. The rectifier circuit 2913 may be configured 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.

In addition, the power receiver 291 may be configured to further include a frequency adjuster 2917 for changing the resonance frequency value of the power receiver 291. Since the resonant frequency of the power receiver 291 is determined based on inductance and capacitance in the circuit constituting the power receiver 291 according to Equation 1, the power reception controller 292 has the inductance and / or capacitance The resonant frequency of the power receiver 291 may be determined by controlling the frequency adjuster 2917 to be changed.

In some embodiments, the frequency adjusting unit 2917 may be configured to include a motor capable of changing capacitance by adjusting a distance between capacitors included in the resonance forming circuit 2912. Also, in some embodiments, the frequency adjusting unit 2917 may be configured to include a motor capable of changing an inductance by adjusting the number of turns or the diameter of the receiving coil 2911b. In addition, in some embodiments, the frequency adjusting unit 2917 may be configured to include active elements for determining the capacitance and / or inductance.

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. In addition, the power converter 111 may further include a multiplexer 1113 for establishing and releasing 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 >

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

FIG. 9 is a block diagram illustrating a wireless power transmitter further including an additional configuration in addition to the configuration illustrated 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 implemented as a separate module or a single module from the power transmission controller 112 in the power converter 110 described with reference to FIG. 2.

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 transmitter according to the exemplary embodiment disclosed above may be applied to devices such as docking stations, terminal cradle devices, and other electronic devices, except when applicable only to the wireless charger. It will be apparent to those skilled in the art that the present invention may be used.

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 a power supply unit 290 illustrated in FIG. 2, 4, or 7.

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, so 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 refer to a server that generates and transmits a broadcast signal and / or broadcast related information or a server that receives a previously generated broadcast signal and / or broadcast related information and transmits the same to a terminal. 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, it may exist in the form of Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or Electronic Service Guide (ESG) 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 configured to be suitable for not only the above-described digital broadcast system but also other broadcast systems.

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. Wireless Internet technologies may include Wireless LAN (Wi-Fi), Wireless Broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), and the like.

The short range communication module 214 is a module for short range communication. As a wireless short range communication technology, Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), and ZigBee® may be used. On the other hand, as a short-distance communication of the wire can be used Universal Serial Bus (USB), IEEE 1394, Thunderbolt (TM) and the like.

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 video obtained by an image sensor in a video call mode or a 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 transmitted to the outside through 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 the 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 be provided with two or more according to the configuration aspect.

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 detect respective rotation angles, ie, azimuth, pitch, and roll, based on three axes.

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, the terminal displays a user interface (UI) or a graphic user interface (GUI) related to the call. When the terminal 200 is in a video call mode or a photographing mode, the terminal 200 displays a photographed and / or received image, a UI, or a GUI.

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 may be referred to as a transparent display. A representative example of the transparent display is TOLED (Transparent OLED). The rear structure of the display unit 251 may also be configured as a light transmissive structure. 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 then transmits the corresponding data to the controller 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 photoelectric sensor, a direct reflection photoelectric sensor, a mirror reflection photoelectric sensor, a high frequency oscillation 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 allowing the pointer to be recognized without being in contact with the touch screen so that the pointer is located on the touch screen is referred to as a "proximity touch", and the touch The act of actually touching the pointer on the screen is called "contact touch." 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 may also output a sound signal related to a function (for example, a call signal reception sound or a message reception sound) 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 generated in the terminal include call signal reception, message reception, key signal input, and touch input. 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) is a variety of software for controlling system tasks such as memory management, power management, etc. It may include 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 . Various command signals or power input from the cradle may be operated as signals 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. In addition, the controller 180 may be implemented as a separate module or a single module from the power receiving control unit 292 in the power supply unit 290 described with reference to FIG. 2.

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 source and / or an internal power source under the control of the controller 280 to supply power for operation of each component.

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.

FIG. 11 illustrates a concept of transmitting and receiving a packet between a wireless power transmitter and an electronic device through modulation and demodulation of a wireless power signal in wireless power transfer according to embodiments of the present disclosure.

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.

12 illustrates a method of displaying data bits and bytes in which the wireless power transmitter 100 configures a power control message.

Referring to FIG. 12A, the power transmission controller 112 detects an encoded bit from the envelope detected signal using the clock signal CLK. 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 non-return to zero (NRZ). In some embodiments, the bit encoding method may be bi-phase encoding.

For example, in some embodiments, the detected bit 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 for encoding data bit 1, and one state transition for encoding data bit 0. To have. That is, data bit 1 is encoded such that a transition between a HI state and a LO state occurs at a rising edge and a falling edge of the clock signal, and data bit 0 is HI at the rising edge of the clock signal. The transition between state and 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 string may be transmitted using an 11-bit asynchronous serial format as shown in FIG. 12C. 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.

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).

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 transmitter 100 transmits power to the electronic device 200 while adjusting power transmitted in response to a control message received from the electronic device 200. .

Hereinafter, each operation state 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 in which an object in the corresponding area may affect the characteristics of the power of the power converter 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 selection state 610 may be referred to as an analog detection process (analog ping) in that an object is detected using a wireless power signal instead of a digital packet in the detection state 620 to be described later. .

The wireless power transmitter 100 in the selection state 610 may detect that an object enters or leaves the detection 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 transmitter 100 formed to include one or more transmitting coils enters the detection state 620 in the selection state 610 and uses each coil in the detection state 620. To determine whether a response to the detection signal is transmitted from the object or to enter the identification state 630 to determine whether 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 transmitter 100 performs an object detection process according to each power transmission method, and then detects the object in a combination method for wireless power transfer in order to proceed to other states 620, 630, and 640. You can choose one.

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 transmitter 100 in the detection state 620 to perform a digital detection process is a wireless power signal formed by applying a power signal of a specific operating point for a predetermined time. Can be. The operation point may mean a frequency, a duty cycle, and an amplitude of a voltage applied to a 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 receive a signal strength packet 5100 including a message indicating the strength of the received wireless power signal in response to the detection signal as shown in FIG. 15. Can transmit 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, for example, an identification packet 5200 including a message indicating identification information of the electronic device 200 as illustrated in FIG. 16A. have. The packet 5200 may be configured to include a header 5220 indicating that it is a packet indicating identification information and a message 5230 including identification information of the 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 extended device identifier exists in the information 5342 indicating the presence or absence of the extended device identifier, an extended identification packet including the extended device identifier as shown in FIG. 5300 may be transmitted separately. The packet 5300 may be configured to include a header 5320 indicating that the packet indicates an extended device identifier and a message 5330 including the extended 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 5520 indicating that the packet is a setup packet and a message 5430 including information on the expected maximum power. The message 5430 includes a power class 5523, information about an expected maximum power 5432, an indicator 5435 indicating how to determine the current of a primary cell on the wireless power transmitter side, and an optional number of configuration packets ( 5434). The indicator 5433 may indicate whether or not the current of the main cell of the wireless power transmitter 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 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 a control error packet and a message 5530 including a control error value. The wireless power transmitter 100 may adjust power applied to the transmission coil according to the control error value. That is, the current applied to the transmitting coil can be adjusted to be maintained when the control error value is zero, to decrease when it is negative and to increase when it is positive.

In the power transfer state 640, the wireless power transmitter 100 may monitor parameters in a power transfer contract generated based on the identification information and / or configuration 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 transmitter 100 may end the wireless power transfer and return to the selection state 610 after receiving the message requesting to stop 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, after receiving the message requesting the renegotiation of the power transfer protocol, the wireless power transmitter 100 may terminate wireless power transmission and return to the identification and setting state 630.

To this end, the message transmitted by the electronic device 200 may be, for example, an end power transfer packet 5600 as illustrated in FIG. 19. The packet 5600 may be configured to include a message 5630 including a header 5620 indicating the power transmission interruption packet and 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.

20 is a conceptual diagram illustrating a resonant frequency in a wireless power transmission / reception system according to an exemplary embodiment disclosed herein.

In the case of wireless power transmission using the magnetic resonance method, the efficiency of power transmission is maximized when the resonant frequencies of the transmitting end of the wireless power transmitter 100 and the receiving end of the electronic device 200 are the same. Accordingly, in order to increase the transmission efficiency, it is important to maintain the same resonant frequency of the transmitting end of the wireless power transmitter 100 and the receiving end of the electronic device 200.

To this end, the wireless power transmitter 100 and the electronic device 200 initially adjust the respective inductance and capacitance. However, when the distance between the wireless power transmitter 100 and the electronic device 200 is changed, the power transmission efficiency or the resonance frequency may be changed.

For example, referring to FIG. 20A, when the wireless power transmitter 100 and the electronic device 200 are separated by a first distance r1, efficiency of power transmission using a preset resonance frequency may be used. This can be maximum.

However, referring to FIG. 20B, when the distance between the wireless power transmitter 100 and the electronic device 200 increases greatly (for example, when changing from r1 to r2), the power transmission efficiency is increased. The quality factor that affects can be changed.

In addition, referring to FIG. 20C, when the distance between the wireless power transmitter 100 and the electronic device 200 greatly decreases (for example, when changing from r2 to r3), the resonance frequency is changed. Problem occurs.

However, until now, energy transmission is being carried out with loss of efficiency without automatic adjustment of inductance or capacitance or additional adjustment. In addition, when the resonant frequencies of the wireless power transmitter 100 and the electronic device 200 are different from each other, the power transmission efficiency may be sharply lowered, and power may not be transmitted.

As described above, since the resonant frequencies of the wireless power transmitter 100 and the electronic device 200 are determined according to capacitance and inductance as shown in Equation 1, the wireless power transmitter 100 to solve such a problem. Or there is a need to change the resonant frequency by adjusting the capacitance and / or inductance of the electronic device 200. However, since capacitors and inductors are passive elements, there is a difficulty in actively changing their values.

Therefore, there is a need for a method of adaptively adjusting the resonance frequency by selectively using a mechanical or circuit switch using a plurality of capacitors or inductors, instead of converting such a passive device into an active device.

21A to 21C are conceptual views illustrating a technique for dynamically changing a resonance frequency of the wireless power transmitter 100 or the electronic device 200 according to the embodiments disclosed herein, respectively.

FIG. 21A is a conceptual diagram illustrating a technique of dynamically changing a resonance frequency of the wireless power transmitter 100 or the electronic device 200 according to the first embodiment disclosed herein.

Referring to FIG. 21A, the resonance forming circuit 1116 or 2912 may include a variable capacitor connected to be operated in plurality in parallel. Each variable capacitor may be selectively driven under the control of the frequency adjusting unit 1117 or 2917. To this end, each variable capacitor may include switches SW1 to SWn and capacitors C1 to Cn connected to be operated in series. As each switch is selectively driven in an open or closed state, a resonance frequency of the power converter 111 or the power receiver 291 is determined. In an exemplary embodiment, the resonant frequency of the power converter 111 or the power receiver 291 may be determined as shown in Table 1 according to the states of the respective switches SW1 to SWn.

Switch status Resonant frequency SW1 SW2 ... SWn close open ... open

open close ... open

open open ... close

However, the configuration of the circuit elements of the plurality of variable capacitors is not limited to the form connected to operate in parallel as shown in FIG. 20A.

FIG. 21B is a conceptual diagram illustrating a technique of dynamically changing a resonance frequency of the wireless power transmitter 100 or the electronic device 200 according to the second embodiment disclosed herein.

Referring to FIG. 21B, the transmitting coil 1111b or the receiving coil 2911b may include a variable inductor connected to be operated in series. Each variable inductor may be selectively driven under the control of the frequency adjusting unit 1117 or 2917. To this end, each variable inductor may include at least one switch (SW11 to SW3) and inductors (L1 to Ln) connected in series. As each switch is selectively driven in an open or closed state, a resonance frequency of the power converter 111 or the power receiver 291 is determined. In an exemplary embodiment, the resonance frequency of the power converter 111 or the power receiver 291 may be determined as shown in Table 2 according to the states of the respective switches SW11 to SW3.

Switch status Resonant frequency SW11 SW21-SW23 ... SWn1-SWn3 close open ... open

open close ... open

open open ... close

However, the configuration of circuit elements of the plurality of variable inductors is not limited to the form of being connected to operate in series as shown in FIG. 20B.

FIG. 21C is a conceptual diagram illustrating a technique of dynamically changing a resonance frequency of the wireless power transmitter 100 or the electronic device 200 according to the third embodiment disclosed herein.

Referring to FIG. 21C, the resonance forming circuit 1116 or 2912 includes a variable capacitor connected to be operated in a plurality of parallel, and the transmitting coil 1111b or the receiving coil 2911b includes a variable inductor connected to be operated in series. It may include. Each variable capacitor and each variable inductor may be selectively driven under the control of the frequency adjusting unit 1117 or 2917. To this end, each variable capacitor may include switches SW1 to SWn and capacitors C1 to Cn connected to be operated in series. Also, for this purpose, each variable inductor may include at least one switch SW11 to SWn3 and inductors L1 to Ln connected to be operated in series. As each switch is selectively driven in an open or closed state, a resonance frequency of the power converter 111 or the power receiver 291 is determined. In an exemplary embodiment, the resonance frequency of the power converter 111 or the power receiver 291 may be determined as shown in Tables 3 to 5 according to the states of the respective switches SW1 to SWn and SW11 to SWn3. have.

Switch status Resonant frequency (when only SW1 closes in variable capacitor) SW11 SW21-SW23 SWn1-SWn3 close open ... open

open close ... open

open open ... close

Switch status Resonant frequency (when only SW2 closes in variable capacitor) SW11 SW21-SW23 ... SWn1-SWn3 close open ... open

open close ... open

open open ... close

Switch status Resonant frequency (when only SWn close in variable capacitor) SW11 SW21-SW23 ... SWn1-SWn3 close open ... open

open close ... open

open open ... close

However, the configuration of the circuit elements of the plurality of variable capacitors is not limited to the type connected to operate in parallel as shown in Figure 20C, the configuration of the circuit elements of the plurality of inductors is limited to the form connected to operate in series as shown in Figure 20C. Not.

As described above, the resonant frequency of the transmitter or the receiver may be dynamically changed by using the variable capacitor and / or the variable inductor. Hereinafter, embodiments of the method for determining the resonance frequency by the wireless power transmitter 100 or the electronic device 200 will be described in detail.

FIG. 22A is a flowchart illustrating a process of determining a resonance frequency by the wireless power transmitter 100 according to the exemplary embodiments disclosed herein.

The wireless power transmitter 100 may wirelessly transmit power to various kinds of electronic devices 200. Here, the heterogeneous electronic device 200 may have different resonance frequencies. Alternatively, even in the same type of electronic device 200 having the same resonant frequency, the selectivity may be changed or the resonant frequency may be changed according to the distance from the wireless power transmitter 100. Therefore, there is a need to adjust the resonant frequency of the wireless power transmitter 100 so as to correspond to the resonant frequency of the electronic device 200 before starting the wireless power transmission or during the wireless power transmission.

Hereinafter, an embodiment in which the wireless power transmitter 100 receives information about a resonance frequency of the receiving end of the electronic device 200 from the electronic device 200 will be described in detail.

In the above-described identification and configuration phase, the wireless power transmitter 100 receives identification information and / or setting information including information on the resonance frequency of the electronic device 200 from the electronic device 200. do. Alternatively, in the aforementioned power transfer phase, the wireless power transmitter 100 receives a power control message including information on the resonance frequency of the electronic device 200 from the electronic device 200. The wireless power transmitter 100 detects a resonance frequency of the electronic device 200 from identification information and / or setting information received from the electronic device 200 or a power control message, and detects the resonance of the detected electronic device 200. The resonance frequency of the power converter 111 is adaptively adjusted based on the frequency.

In detail, the wireless power transmitter 100 demodulates the wireless power signal modulated by the electronic device 200 (S110). The wireless power transmitter 100 decodes the packet from the demodulated wireless power signal (S120). In addition, the wireless power transmitter 100 detects a resonant frequency (more specifically, a resonant frequency of the receiver including the receiver coil 2911b and the resonance forming circuit 2912) of the electronic device 200 from the decoded packet. (S130). In addition, the wireless power transmitter 100 adjusts the resonance frequency of the power converter 111 according to the first to third embodiments described above based on the detected resonance frequency of the electronic device 200 (S140).

In this case, based on the relationship between the state of the switch and the resonant frequency described with reference to Tables 1 to 5, the power transmission control unit 112 adjusts the resonance frequency of the power conversion unit 111 to the resonance of the electronic device 200. A control signal for changing to a resonant frequency equal to or closest to a frequency may be output, and the frequency adjusting unit 1117 selectively operates the plurality of variable capacitors and / or the plurality of variable inductors according to the control signal to convert the power. The resonance frequency of the unit 111 may be adjusted.

22B is a flowchart illustrating a process of determining a resonant frequency by the electronic device 200 according to the exemplary embodiments disclosed herein.

The electronic device 200 may wirelessly receive power from various kinds of wireless power transmitters 100. Here, the heterogeneous wireless power transmitter 100 may have different resonance frequencies. Alternatively, even in the same type of wireless power transmitter 100 having the same resonant frequency, the selectivity may be changed or the resonant frequency may be changed according to the distance from the electronic device 200. Therefore, there is a need to adjust the resonant frequency of the electronic device 200 to correspond to the resonant frequency of the wireless power transmitter 100 before the wireless power reception or during the wireless power reception.

Hereinafter, an embodiment in which the electronic device 200 receives information about a resonance frequency for the transmitting end of the wireless power transmitter 100 from the wireless power transmitter 100 will be described in detail.

The electronic device 200 may include identification information and / or information including information about a resonance frequency of the wireless power transmitter 100 from the wireless power transmitter 100 before wirelessly receiving power from the wireless power transmitter 100. The setting information can be received. Alternatively, the electronic device 200 may transmit a power control message including information about a resonance frequency of the wireless power transmitter 100 from the wireless power transmitter 100 while receiving power wirelessly from the wireless power transmitter 100. Can be received. The electronic device 200 detects a resonance frequency of the wireless power transmitter 100 from identification information and / or setting information received from the wireless power transmitter 100, or a power control message, and detects the detected wireless power transmitter ( The resonance frequency of the power receiver 291 may be adaptively adjusted based on the resonance frequency of 100.

In detail, the electronic device 200 demodulates the wireless power signal received from the wireless power transmitter 100 (S210). In operation S220, the electronic device 200 decodes the packet from the demodulated wireless power signal. The electronic device 200 detects a resonant frequency of the wireless power transmitter 100 (more specifically, a resonant frequency of a transmitting end including the transmitting coil 1111b and the resonance forming circuit 1116) from the decoded packet. (S230). The electronic device 200 adjusts the resonance frequency of the power receiver 291 according to the above-described first to third embodiments based on the detected resonance frequency of the wireless power transmitter 100 (S240).

In this case, based on the relationship between the state of the switch and the resonance frequency described with reference to Tables 1 to 5, the power reception control unit 292 sets the resonance frequency of the power reception unit 291 of the wireless power transmitter 100. Outputs a control signal for changing to a resonant frequency that is the same as or closest to the resonant frequency, and the frequency adjusting unit 2917 selectively operates each of the plurality of variable capacitors and / or the plurality of variable inductors according to the control signal. 291) can be adjusted.

In the above description, the wireless power transmitter 100 adjusts the resonant frequency of the wireless power transmitter 100 based on information on the resonance frequency of the receiver of the electronic device 200 received from the electronic device 200, or electronically. The method for adjusting the resonant frequency of the electronic device 100 based on the information on the resonant frequency of the transmitting end of the wireless power transmitter 100 received by the device 200 from the wireless power transmitter 100 has been described. .

Hereinafter, the wireless power transmitter 100 may adjust the resonant frequency according to a change in current or voltage in a circuit that is detected by the wireless power transmitter 100 modulated by the electronic device 200. The electronic device 200 will be described in detail with respect to a method in which the electronic device 200 adjusts a resonance frequency according to a change in current or voltage in a circuit sensed by the wireless power signal received from the wireless power transmitter 100. .

FIG. 23A is a flowchart illustrating a process of determining a resonance frequency by the wireless power transmitter 100 according to the exemplary embodiments disclosed herein.

In the aforementioned power transfer phase, the wireless power transmitter 100 detects a change in electrical characteristics of the power converter 111 based on a wireless power signal modulated by the electronic device 200, and detects the change. The resonance frequency of the power converter 111 is changed based on the changed electrical characteristics.

In detail, the wireless power transmitter 100 detects a current or voltage in the power converter 111 (S310), and compares the detected current or voltage with a reference value (S320). Here, the reference value may be the maximum current or the maximum voltage detected by the power converter 111 when the wireless power transmitter 100 resonates with the electronic device 200.

The wireless power transmitter 100 determines whether the difference between the current or the voltage and the reference value is within a predetermined range (S330). The predetermined range may be set in advance, and the smaller the predetermined range is, the maximum transmission efficiency is guaranteed while the resonant frequency is changed frequently, and the larger the predetermined range is, the maximum transmission efficiency is not guaranteed while the resonant frequency is changed. Rarely can be done. Therefore, the predetermined range may be set by the supplier or the user of the wireless power transmitter 100 in consideration of the maximum transmission efficiency and the power transmission cycle.

In operation 330, when the difference between the current or voltage and the reference value is within a predetermined range, the wireless power transmitter 100 ends the process. In contrast, when the difference between the current or voltage and the reference value is not within a predetermined range in step 330, the wireless power transmitter 100 adjusts the resonance frequency of the power converter 111 (S340).

In this case, based on the relationship between the state of the switch and the resonant frequency described with reference to Tables 1 to 5, the power transmission control section 112 searches for a resonant frequency that ensures maximum transmission efficiency. The power transmission control unit 112 determines the switch state when the power transmission efficiency is maximum while changing the state of each power switch. The power transmission control unit 112 outputs a control signal for changing the resonant frequency of the power converter 111 according to the determined state of the switch, and the frequency adjusting unit 1117 outputs a plurality of variable capacitors and / or a plurality of variable capacitors according to the control signal. By selectively operating each of the variable inductors of the resonant frequency of the power converter 111 can be adjusted.

FIG. 23B is a flowchart illustrating a process of determining a resonant frequency by the electronic device 200 according to embodiments of the present disclosure.

While the electronic device 200 wirelessly receives power from the wireless power transmitter 100, the electronic device 200 may determine the power of the power receiver 291 based on the wireless power signal received from the wireless power transmitter 100. A change in electrical characteristics is sensed, and a resonance frequency of the power receiver 291 is changed based on the detected change in electrical characteristics.

In detail, the electronic device 200 detects a current or voltage in the power receiver 291 (S410), and compares the detected current or voltage with a reference value (S420). Here, the reference value may be a maximum current or maximum voltage detected by the power receiver 291 when the electronic device 200 resonates with the wireless power transmitter 100.

The electronic device 200 determines whether a difference between the current or the voltage and the reference value is within a predetermined range (S430). The predetermined range may be set in advance, and the smaller the predetermined range is, the maximum transmission efficiency is guaranteed while the resonant frequency is changed frequently, and the larger the predetermined range is, the maximum transmission efficiency is not guaranteed, while the resonant frequency is rarely changed. Can be done. Therefore, the predetermined range may be set by the supplier or the user of the electronic device 200 in consideration of the maximum transmission efficiency and the power transmission cycle.

In operation 430, when the difference between the current or voltage and the reference value is within a predetermined range, the electronic device 200 ends the process. In contrast, when the difference between the current or voltage and the reference value is not within a predetermined range in step 430, the electronic device 100 adjusts the resonance frequency of the power receiver 291 (S440).

In this case, based on the relationship between the state of the switch and the resonant frequency described with reference to Tables 1 to 5, the power reception control unit 292 searches for a resonant frequency that ensures maximum transmission efficiency. The power reception control unit 292 determines the switch state when the power transmission efficiency is maximum while changing the state of each power switch. The power receiving control unit 292 outputs a control signal for changing the resonant frequency of the power receiving unit 292 according to the determined state of the switch, and the frequency adjusting unit 2917 includes a plurality of variable capacitors and / or a plurality of variable capacitors according to the control signal. By selectively operating each of the variable inductors, the resonance frequency of the power receiver 291 may be adjusted.

In addition to the method of changing the frequency of the transmitter or receiver by changing the inductance or capacitance in the circuit as in the first to third embodiments described above, the resonance frequency is multiplied by multiplying or dividing a basic clock built in the transmitter or receiver circuit. Dynamic adjustments can also be applied. For example, the power transmission control unit 112 or the power reception control unit 292 may include a timer / counter and adjust the resonant frequency by changing a basic clock using pulse width modulation (PWM). Alternatively, the power converter 111 or the power receiver 291 may adjust the resonant frequency by changing a basic clock by embedding a digital programming phase-locked loop (PLL).

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 the hardware implementation, the methods described so far are application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and processors ( It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions. The control unit 180 or the power transmission control unit 112 of the power transmission apparatus 100 may be implemented, or the methods may be implemented by the control unit 280 or the power reception control unit 292 of the electronic device 200. .

According to the software implementation, embodiments such as the procedures and functions described herein may be implemented as 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 transmitter 100 and may be executed by the controller 180 or the power transmission controller 112, and likewise, the memory of the electronic device 200 may be 260, and may be executed by the control unit 280 or the power receiving control unit 292.

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

100: wireless power transmitter 200: electronics

Claims (20)

A power converter configured to form a wireless power signal for resonance coupling with a wireless power receiver, and receive a wireless power signal modulated by the wireless power receiver; And
A transmission controller configured to sense a change in electrical characteristics of the power converter based on the modulated wireless power signal, and output a control signal for changing a resonance frequency in the power converter based on the sensed change in electrical characteristics; and,
The power converter,
A plurality of variable capacitors; And
And a frequency controller configured to selectively adjust the resonance frequency of the power converter by selectively operating each of the plurality of variable capacitors according to the control signal. The method of claim 1, wherein each of the plurality of variable capacitors,
Wireless power transmission apparatus, characterized in that connected to be operable in parallel. The method of claim 1, wherein each of the plurality of variable capacitors,
A wireless power transmission device comprising a switch and a capacitor operatively connected in series. The apparatus of claim 1, further comprising a demodulator for demodulating the modulated wireless power signal and decoding a packet from the demodulated wireless power signal.
The transmission control unit,
And detecting a resonant frequency of the wireless power receiver from the decoded packet. The method of claim 1, wherein the transmission control unit,
And comparing the current or voltage detected by the power converter with a reference value to detect a change in the electrical characteristic. A power receiver configured to receive a wireless power signal for resonance coupling from the wireless power transmitter; And
And a reception controller configured to sense a change in electrical characteristics of the power receiver based on the received wireless power signal, and output a control signal for changing a resonance frequency of the power receiver based on the detected change in electrical characteristics. ,
The power receiver,
A plurality of variable capacitors; And
And a frequency controller configured to selectively adjust the resonant frequency of the power receiver by selectively operating each of the plurality of variable capacitors according to the control signal. The method of claim 6, wherein each of the plurality of variable capacitors,
Wireless power receiver, characterized in that connected to be operable in parallel. The method of claim 6, wherein each of the plurality of variable capacitors,
A wireless power receiver comprising a switch and a capacitor operatively connected in series. The apparatus of claim 6, further comprising a demodulator for demodulating the wireless power signal and decoding a packet from the demodulated wireless power signal.
The reception control unit,
And detecting a resonant frequency of the wireless power transmitter from the decoded packet. The method of claim 6, wherein the receiving control unit,
Wireless current receiver, characterized in that for detecting the change in the electrical characteristics by comparing the current or voltage detected by the power receiver with a reference value. A power converter configured to form a wireless power signal for resonance coupling with a wireless power receiver, and receive a wireless power signal modulated by the wireless power receiver; And
A transmission controller configured to sense a change in electrical characteristics of the power converter based on the modulated wireless power signal, and output a control signal for changing a resonance frequency in the power converter based on the sensed change in electrical characteristics; and,
The power converter,
A plurality of variable inductors; And
And a frequency controller configured to selectively adjust the resonance frequencies of the power converter by selectively operating each of the plurality of variable inductors according to the control signal. The method of claim 11, wherein each of the plurality of variable inductor,
Wireless power transmission device, characterized in that connected in series to be operable. The method of claim 11, wherein each of the plurality of variable inductor,
And at least one switch and inductor operatively connected in series. 12. The apparatus of claim 11, further comprising a demodulator for demodulating the modulated wireless power signal and decoding a packet from the demodulated wireless power signal.
The transmission control unit,
And detecting a resonant frequency of the wireless power receiver from the decoded packet. The method of claim 11, wherein the transmission control unit,
And comparing the current or voltage detected by the power converter with a reference value to detect a change in the electrical characteristic. A power receiver configured to receive a wireless power signal for resonance coupling from the wireless power transmitter; And
And a reception controller configured to sense a change in electrical characteristics of the power receiver based on the received wireless power signal, and output a control signal for changing a resonance frequency of the power receiver based on the detected change in electrical characteristics. ,
The power receiver,
A plurality of variable inductors; And
And a frequency controller configured to selectively adjust the resonance frequency of the power converter by selectively operating each of the plurality of variable inductors according to the control signal. The method of claim 16, wherein each of the plurality of variable inductors,
Wireless power receiver, characterized in that connected in operative operation in series. The method of claim 16, wherein each of the plurality of variable inductors,
And at least one switch and inductor operatively connected in series. 17. The apparatus of claim 16, further comprising a demodulator for demodulating the wireless power signal and decoding a packet from the demodulated wireless power signal.
The reception control unit,
And detecting a resonant frequency of the wireless power transmitter from the decoded packet. The method of claim 16, wherein the receiving control unit,
Wireless current receiver, characterized in that for detecting the change in the electrical characteristics by comparing the current or voltage detected by the power receiver with a reference value.

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