WO2013002437A1

WO2013002437A1 - Method for avoiding a signal collision in a one-way communication in a wireless power transmission

Info

Publication number: WO2013002437A1
Application number: PCT/KR2011/004743
Authority: WO
Inventors: 이재성; 서정교
Original assignee: 엘지전자 주식회사
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2013-01-03

Abstract

The present invention relates to a wireless power transmission apparatus, and to a method for controlling same, the wireless power transmission device being operable so as to enable a plurality of electronic devices to effectively, stably, and simultaneously receive wireless power from the wireless power transmission apparatus by generating a wireless power signal, receiving response signals corresponding to the wireless power signal from the plurality of electronic devices, determining whether or not there is collision between the response signals, and resetting power transmission if it is determined that there is collision. For this purpose, the wireless power transmission apparatus according to one embodiment of the present invention comprises: a power converter for generating a wireless power signal for the power transmission and receiving a first response signal and a second response signal which correspond to the wireless power signal; and a power transmission controller for determining whether or not the first and second response signals collide with each other and re-setting the power transmission if it is determined that there is a collision between the first and second response signals, wherein the first response signal and the second response signal are generated through a modulation of the wireless power signal by a first device and a second device, respectively. Further, the present invention relates to an electronic device, and to a method for controlling same, the electronic device being capable of effectively and stably receiving wireless power by determining whether or not a wireless power transmission apparatus resets the power transmission due to the collision of the response signals of the plurality of electronic devices, and changing delay times of the response signals if it is determined that the power transmission is re-set. For this purpose, the electronic device according to one embodiment of the present invention comprises: a power receiver for receiving the wireless power signal for the power transmission from the wireless power transmission apparatus; a power receiving controller for controlling a third response signal corresponding to the wireless power signal within a first response period after the lapse of an interval set to a first time, determining whether or not the power transmission of the wireless power transmission apparatus is reset, setting the interval to a second time on the basis of the determined results when the power transmission is reset, and controlling the power receiver so as to transmit a fourth response signal corresponding to the wireless power signal within a second response period after the interval set to the second time.

Description

Signal Collision Avoidance Method in Unidirectional Communication in Wireless Power Transmission

The present disclosure relates to wireless charging, and more particularly, to wireless charging according to charging characteristics.

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.

The present specification forms a wireless power signal, receives response signals corresponding to the wireless power signal from a plurality of electronic devices, determines whether there is a collision between the response signals, and transmits power when there is a collision as a result of the determination. It is an object of the present invention to provide a wireless power transmitter and a method of controlling the same so that a plurality of electronic devices can be efficiently and stably supplied with wireless power from the wireless power transmitter by resetting the same.

In addition, the present specification, it is determined whether the wireless power transmitter resets the power transmission due to the collision of response signals of a plurality of electronic devices, and if the resetting of the power transmission as a result of the determination, change the delay time of the response signals Accordingly, an object of the present invention is to provide an electronic device and a control method thereof that operate to efficiently and stably receive wireless power from the wireless power transmitter.

The wireless power transmitter according to the exemplary embodiment disclosed herein for realizing the above object forms a wireless power signal for power transmission, and generates a first response signal and a second response signal corresponding to the wireless power signal. A power conversion unit for receiving; And a power transmission control unit which determines whether the first response signal and the second response signal collide, and resets the power transmission when the first response signal and the second response signal collide based on the determination result. The first response signal and the second response signal may be generated by modulating the wireless power signal by a first device and a second device, respectively.

According to an embodiment, the power transmission control unit may control to sequentially receive the first response signal and the second response signal which are formed so as not to collide with each other as a result of the resetting of the power transmission.

According to an embodiment, the sequentially receiving may include receiving the first response signal after a first time interval within a predetermined response period, and receiving the second response signal after a second time interval. do.

According to an embodiment, the first time interval and the second time interval may be determined based on a value generated by generating a random number.

In addition, according to one embodiment, the predetermined response period is determined to be longer than the time that can include both the first response signal and the second response signal, characterized in that determined after resetting the power transmission.

In addition, according to an embodiment, the collision occurrence determination may be performed according to whether the first response signal and the second response signal are decoded using a predetermined format.

According to one embodiment, the predetermined format includes a preamble, a header and a message,

In the determination of whether the first response signal and the second response signal collide with each other, at least one of the preamble, the header, and the message may cause an error due to the collision to restore the first response signal and the second response signal. It is characterized by judging based on whether or not.

According to an embodiment, the power converter periodically receives a response signal of the first device that does not collide with a response signal of the second device within a first response period, and the power transmission control unit is configured to perform the first transmission. And decoding the response signal and the second response signal using a predetermined format, and determining whether a collision occurs between the first response signal and the second response signal based on whether the decoding is performed.

According to an embodiment of the present disclosure, the first response signal and the second response signal may be periodically received within a second response period, and the second response period may include both the first response signal and the second response signal. It is determined to be longer than the time, which is determined after resetting the power transmission.

According to an embodiment, the first response signal and the second response signal may be the wireless power signal whose amplitude is modulated by the first device and the second device, respectively, and determining whether the collision occurs comprises: The method may determine whether the first device and the second device can be detected based on the first response signal and the second response signal, respectively.

According to an embodiment, the first response signal and the second response signal may include identification information corresponding to the first device and the second device, respectively, and the collision determination may be performed by the first response signal. And determining whether identification information of the detected second device is obtained through reception of the second response signal.

In addition, according to one embodiment, the reset of the power transmission, characterized in that to stop the formation of the wireless power signal for the power transmission.

According to an embodiment, the resetting of the power transmission may transmit a signal including information indicating that the first response signal and the second response signal have collided to the first device and the second device, respectively. It is done.

On the other hand, an electronic device according to an embodiment disclosed in the present disclosure for realizing the above object, the power receiving unit for receiving a wireless power signal for power transmission from the wireless power transmitter; The power receiver controls to transmit a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period, determines whether the power transmission of the wireless power transmitter is reset, and On the basis of the determination result, when the power transmission is reset, the time interval is set to the second time, and the power receiver receives the fourth response signal corresponding to the wireless power signal within the second response period within the second response period. It characterized in that it comprises a power receiving control unit for controlling to transmit after a time interval set to.

According to an embodiment, the second time may be determined based on a value generated by generating a random number.

According to an embodiment of the present disclosure, the second response period may be determined to be longer than a time period that may include both the fourth response signal and the fifth response signal transmitted from the plurality of other electronic devices.

In addition, according to one embodiment, the determination of whether the power transmission is reset, characterized in that it is determined based on whether the wireless power signal is received.

Further, according to one embodiment, the determination of whether or not the power transmission is reset,

And determining whether a signal including information indicating that the third response signal is not decoded using a predetermined format is received from the wireless power transmitter.

According to an embodiment, the third response signal includes a preamble, a header and a message, and the information indicating that the third response signal is not decoded using a predetermined format includes the preamble, the header and the message. Wherein at least one of the pieces of information is information indicating that an error due to a collision occurs and the third response signal cannot be restored.

On the other hand, the control method of the wireless power transmitter according to an embodiment disclosed in the present specification for realizing the above object, forming a wireless power signal for power transmission; Receiving a first response signal and a second response signal corresponding to the wireless power signal, wherein the first response signal and the second response signal are modulated by the first device and the second device, respectively; Is generated; Determining whether the first response signal and the second response signal collide; And resetting the power transmission when the first response signal and the second response signal collide with each other based on the determination result.

According to an embodiment, the method may further include sequentially receiving a first response signal and a second response signal that are formed so as not to collide with each other as a result of the resetting of the power transmission.

According to an embodiment, the sequentially receiving may include receiving the first response signal after a first time interval within a predetermined response period and receiving the second response signal after a second time interval. It is done.

According to an embodiment, the predetermined format includes a preamble, a header, and a message, and the determination of whether the first response signal and the second response signal collide with each other, at least one of the preamble, header, and message. Is determined based on whether an error due to a collision occurs and the first response signal and the second response signal cannot be restored.

According to an embodiment, the method may further include periodically receiving a response signal of the first device that does not collide with the response signal of the second device within a first response period, and determining whether the collision has occurred. Decoding the first response signal and the second response signal using a predetermined format; And determining whether a collision occurs between the first response signal and the second response signal based on whether the decoding is performed.

According to one embodiment, the resetting of the power transmission, characterized in that to return to the step of forming a wireless power signal for the power transmission.

On the other hand, the control method of an electronic device according to an embodiment disclosed in the present disclosure for realizing the above object, the step of receiving a wireless power signal for power transmission from the wireless power transmitter; Transmitting a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period; Determining whether power transmission of the wireless power transmitter is reset; Setting the time interval to a second time when the power transmission is reset based on the determination result; And transmitting a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period.

Further, according to one embodiment, the determination of whether the power transmission is reset, whether or not a signal including information indicating that the third response signal is not decoded using a predetermined format is received from the wireless power transmitter. It is characterized by determining based on.

According to an embodiment, the third response signal includes identification information corresponding to the electronic device, and the information indicating that the third response signal is not decoded using a predetermined format is the wireless power transmitter. Is information indicating that identification information corresponding to the electronic device cannot be obtained based on the reception of the third response signal.

According to one embodiment disclosed in the present specification, when a plurality of electronic devices are placed or entered into an active area or a sensing area of a wireless power transmitter to wirelessly receive power, In order to avoid collision of response signals, a wireless power transmitter for resetting power transmission when the response signals collide.

Further, according to one embodiment disclosed in the present specification, when a plurality of electronic devices are placed or entered into an active area or a sensing area of a wireless power transmitter to wirelessly receive power, the plurality of electronic devices may be used. In order to avoid collision of response signals of the device, an electronic device for changing a delay time corresponding to the response signals is provided.

In particular, according to the wireless power transmitter and the electronic device disclosed herein, the collision probability of the response signals is reduced, and the reset time of the power transmission and the delay time corresponding to the response signals are repeatedly changed until there is no collision. By doing so, there is an advantage that a plurality of electronic devices can be efficiently and stably received wireless power from the wireless power transmitter at the same time.

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.

3 illustrates a concept of wirelessly transferring power from a wireless power transmitter to an electronic device according to an inductive coupling method.

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 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to a resonance coupling method.

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 illustrating a wireless power transmitter further including an additional configuration in addition to the configuration illustrated in FIG. 2A.

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

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 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 delivery method according to embodiments disclosed herein.

FIG. 14 illustrates operation states of the wireless power transmitter 100 and the electronic device 200 according to the embodiments disclosed herein.

15 to 19 illustrate a structure of packets including a power control message between the wireless power transmitter 100 and the electronic device 200.

20 is a structural diagram of unidirectional communication between a wireless power transmitter and a plurality of electronic devices.

21 is an exemplary diagram illustrating a possibility of collision between response signals of a plurality of electronic devices in unidirectional communication between the wireless power transmitter and the plurality of electronic devices.

22 illustrates a process in which response signals of a plurality of electronic devices collide with each other.

23 is a flowchart illustrating a control method of a wireless power transmitter for avoiding signal collision in unidirectional communication in wireless power transmission according to an embodiment disclosed in the present specification.

24 is a flowchart illustrating a control method of an electronic device for signal collision avoidance in unidirectional communication in wireless power transmission according to an embodiment disclosed in the present specification.

25 is an exemplary view illustrating a signal collision avoidance method in unidirectional communication in wireless power transmission according to the first embodiment disclosed herein.

26 is a flowchart illustrating a signal collision avoidance method in unidirectional communication in wireless power transmission according to the second embodiment disclosed herein.

The technology disclosed herein applies to wireless 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 to be noted that the technical terms used herein are merely used to describe particular embodiments and are not intended to limit the spirit of the technology disclosed herein. In addition, the technical terms used herein should be construed as meanings generally understood by those skilled in the art to which the technology disclosed herein belongs, unless defined otherwise in this specification. It should not be interpreted in a comprehensive sense, or in an overly reduced sense. In addition, when the technical terms used herein are incorrect technical terms that do not accurately express the spirit of the technology disclosed herein, it should be replaced with technical terms that can be understood correctly by those skilled in the art. In addition, the general terms used herein should be interpreted as defined in the dictionary, or according to the context before and after, and should not be interpreted in an excessively reduced sense.

Also, the singular forms used herein include the plural forms unless the context clearly indicates 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.

In addition, the suffixes "module" and "unit" for the components used herein are given or mixed in consideration of ease of specification, and do not have meanings or roles that are distinguished from each other.

In addition, terms including ordinal numbers, such as first and second, as used herein may be used to describe various components, but the components 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 the second component, and similarly, the second component may also be referred to as the first component.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

In addition, in describing the technology disclosed herein, if it is determined that the detailed description of the related known technology may obscure the gist of the technology disclosed herein, the detailed description thereof will be omitted. In addition, it is to be noted that the accompanying drawings are only for easily understanding the spirit of the technology disclosed in this specification, and the spirit of the technology should not be construed as being limited by the accompanying drawings.

1-conceptual diagram of a wireless power transmitter and an electronic device

As can be seen with reference to FIG. 1, the wireless power transmitter 100 may be a power transmission device for wirelessly transmitting power required for the electronic device 200.

In addition, the wireless power transmitter 100 may be a wireless charging device that charges a battery of the electronic device 200 by transferring power wirelessly. An embodiment implemented with the wireless power transmitter 100 will be described later with reference to FIG. 9.

In addition, the wireless power transmitter 100 may be implemented as various types of devices that deliver power to the electronic device 200 requiring power in a non-contact state.

The electronic device 200 is a device capable of operating by wirelessly receiving power from the wireless power transmitter 100. In addition, the electronic device 200 may charge the battery using the received wireless power.

On the other hand, the electronic device for wirelessly receiving power described herein includes all portable electronic devices, such as input / output devices such as a keyboard, a mouse, an auxiliary output device for video or audio, and a mobile phone, a cellular phone, a smart phone ( Smart phone (PDA), Personal Digital Assistants (PDA), Portable Multimedia Player (PMP), tablets, or multimedia devices should be interpreted in a comprehensive sense.

As described below, the electronic device 200 may be a mobile communication terminal (eg, a mobile phone, a cellular phone, a tablet) or a multimedia device. An embodiment in which the electronic device 200 is implemented as a mobile terminal will be described below with reference to FIG. 10.

The wireless power transmitter 100 may use one or more wireless power transfer methods to wirelessly transfer power to the electronic device 200 without contact with each other. That is, the wireless power transmitter 100 has an inductive coupling based on an electromagnetic induction generated by the wireless power signal and a resonance coupling based on an electromagnetic resonance generated by a wireless power signal having a specific frequency. Power can be delivered using one or more of Electromagnetic Resonance Coupling.

The wireless power transmission by the inductive coupling method is a technology for wirelessly transmitting power using a primary coil and a secondary coil, and a current is transmitted to the other coil side by a changing magnetic field generated by an electromagnetic induction phenomenon in one coil. It is said that power is delivered by being derived.

In the wireless power transmission by the resonance coupling method, electromagnetic resonance occurs in the electronic device 200 by a wireless power signal transmitted from the wireless power transmitter 100, and the wireless power transmission is performed by the resonance phenomenon. The power is transmitted from the device 100 to the electronic device 200.

Hereinafter, embodiments of the wireless power transmitter 100 and the electronic device 200 disclosed herein will be described in detail. The reference numerals added to the components of each of the following drawings are the same as long as the same reference numerals are used as long as they are shown in different drawings.

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

2A-Wireless Power Transmitter

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 converter 111 converts the power supplied from the transmission power supply 190 into a wireless power signal and transmits the converted power 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 converter 111 may be configured to include a primary coil for forming a magnetic field that changes in order to induce a current in the secondary coil of the electronic device 200 according to an inductive coupling method. . 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.

In addition, in some embodiments, the power converter 111 may transfer power using one or more of the above-described inductive coupling method and resonance 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.

On the other hand, the power converter 111 may be configured to further include a circuit that can adjust the characteristics such as the frequency, applied voltage, current used to form 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 unit 112 may be implemented to be integrated with another control unit (not shown) that controls the wireless power supply device 100.

On the other hand, the wireless power signal can reach the area can be divided into two. First, an active area refers to an area through which a wireless power signal for transmitting power to the electronic device 200 passes. Next, a semi-active area refers to a region of interest in which the wireless power transmitter 100 may detect the presence of the electronic device 200. Here, the power transmission control unit 112 may detect whether the electronic device 200 is placed or removed in the activity area or the detection area. In detail, the power transmission control unit 112 uses the wireless power signal formed by the power conversion unit 111 or whether the electronic device 200 is disposed in the active area or the detection area by a sensor provided separately. It can be detected. For example, the power transmission control unit 112 is influenced by the wireless power signal due to the electronic device 200 present in the sensing area, the power for forming the wireless power signal of the power converter 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 vary according to a wireless power transmission method such as an inductive coupling method and a resonance coupling method.

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

In addition, the power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and current of the power conversion unit 111 for forming the wireless power signal. The determination of the characteristic may be made by the condition of the wireless power transmitter 100 side or by the condition of the electronic device 200 side. In some embodiments, the power transmission control unit 112 may determine the characteristic based on the device identification information of the electronic device 200. In some embodiments, the power transmission control unit 112 may determine the characteristic based on the required power information of the electronic device 200 or profile information on the required 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 rectified power amount information, charge state information, and identification information of the electronic device 200. One or more of the following characteristics can be determined: frequency, current, voltage.

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 transmitter 100 may receive information to be output acoustically or visually 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 demodulation unit 113 may be used to demodulate the wireless power signal modulated by the electronic device 200 to 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.

According to one embodiment disclosed herein, the wireless power transmitter 100 may supply power to a plurality of electronic devices. In this case, wireless power signals modulated by the plurality of electronic devices may collide. Accordingly, components included in the wireless power transmitter 100 may perform various operations to avoid collision of the modulated wireless power signals.

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

In addition, the power converter 111 may form a wireless power signal for power transmission and receive a first response signal and a second response signal corresponding to the wireless power signal.

The power transmission control unit 112 determines whether the first response signal and the second response signal collide with each other, and when the first response signal and the second response signal collide based on the determination result, the power transmission. Can be reset.

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

In addition, the power transmission control unit 112 may control the power conversion unit 111 to sequentially receive the first response signal and the second response signal which are formed so as not to collide with each other as a result of the resetting of the power transmission.

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

The predetermined response interval (Tping interval) may be determined to be longer than the time that can include both the first response signal and the second response signal, and may be determined after resetting the power transmission.

According to an embodiment, the determination of whether a collision occurs may be performed according to whether the first response signal and the second response signal are decoded using a predetermined format, and the predetermined format is a preamble, a header. And a message, wherein the determination of whether the first response signal and the second response signal collide with each other comprises: an error due to a collision of at least one of the preamble, the header, and the message occurs. 2 may be determined based on whether the response signal cannot be restored.

According to an embodiment, the power converter 111 periodically receives a response signal of the first device that does not collide with the response signal of the second device within a first response period (Tping interval_1), and The power transmission control unit decodes the first response signal and the second response signal using a predetermined format, and whether a collision occurs between the first response signal and the second response signal based on whether the decoding is performed. It may be to determine. Here, the first response signal and the second response signal are periodically received within a second response period (Tping interval_2), and the second response period (Tping interval_2) includes both the first response signal and the second response signal. It may be determined to include more than the time that can be included, and after resetting the power transmission.

Figure 2 (b)-electronic device

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 receiver 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 receiver 291 may include a secondary coil in which a current is induced by a magnetic field that is changed as a component according to an inductive coupling scheme. Also, in some embodiments, the power receiver 291 may include a coil and a resonance forming circuit in which a resonance phenomenon is generated 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 which case the power receiver 291 is implemented to receive using one coil, or each It may be implemented to receive using a coil formed differently according to 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.

The power receiver 291 may further include a rectifier and a regulator for converting the wireless power signal into a direct current. In addition, the power receiver 291 may further include a circuit for preventing overvoltage or overcurrent from occurring by 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 control unit 292 may transmit the power control message through a method of transmitting the user data.

In order to transmit the power control message, the electronic device 200 may be further configured to further include a power demodulation / demodulation unit 293 electrically connected to the power receiver 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 each of the

demodulators

113 and 293 of the wireless power transmitter 100 and the electronic device 200 is 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. The 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 converter 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 acquiring 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 a power control message by transmitting user data including a power control message by a communication means (not shown) included in the electronic device 200. The wireless power transmitter 100 may be transmitted.

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

The electronic device 200, which is supplied with power for operation from the power supply unit 290, operates by the power delivered from the wireless power transmitter 100, or uses the transferred power to the battery 299. ) May be operated by power charged in the battery 299. In this case, the power receiving control unit 292 may control the charging unit 298 to perform charging by using the transferred power.

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

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

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

Further, according to an embodiment, the power reception control unit 292 determines whether the power transmission of the wireless power transmitter 100 is reset due to the collision of the modulated wireless power signals, and based on the determination result, When the power transmission is reset, the time interval may be set to the second time.

According to an embodiment, the power reception control unit 292 may set the power response unit 291 to the second time in a second response period (Tping interval_2) in response to the wireless power signal. The transmission may be controlled after a time interval, and the second time may be determined based on a value generated by generating a random number.

Hereinafter, a wireless power transmitter and an electronic device 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.

3-Inductive coupling scheme

3 illustrates a concept of wirelessly transferring power from a wireless power transmitter to an electronic device according to embodiments supporting an inductive coupling scheme.

When the power transfer of the wireless power transmitter 100 follows the inductive coupling method, when the intensity of the current flowing in the primary coil in the power transmitter 110 changes, the primary coil is changed by the current. The magnetic field passing through changes. The changed magnetic field generates 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. In addition, the power receiver 291 of the electronic device 200 is configured to include a Rx coil (2911a) to operate as a secondary coil in magnetic induction.

First, the wireless power transmitter 100 and the electronic device 200 are disposed such that the transmitting coil 1111a of the wireless power transmitter 100 and the receiving coil of the electronic device 200 are close to each other. After that, when the power transmission control unit 112 controls the current of the transmission coil 1111a to be changed, the power receiver 291 uses the electromotive force induced in the reception coil 2911a to the electronic device 200. Control to supply power.

The efficiency of the wireless power transfer by the inductive coupling method has little influence on the frequency characteristics, but the alignment and distance between the wireless power transmitter 100 and the electronic device 200 including each coil. (distance) is affected.

Meanwhile, the wireless power transmitter 100 may be configured to include an interface surface (not shown) in the form of a flat surface for wireless power transfer by an inductive coupling method. One or more electronic devices may be placed on an upper portion of the interface surface, and the transmitting coil 1111a may be mounted on a lower portion of the interface surface. In this case, a vertical spacing is formed between the transmitting coil 1111a mounted below the interface surface and the receiving coil 2911a of the electronic device 200 located above the interface surface so that the coil is made small. The distance between them is small enough to allow efficient wireless power transfer by inductive coupling.

In addition, an array indicating unit (not shown) indicating a position where the electronic device 200 is to be placed may be formed on the interface surface. The arrangement indicator indicates the position of the electronic device 200 in which an arrangement between the transmitting coil 1111a and the receiving coil 2911a mounted below the interface surface can be suitably made. In some embodiments, the alignment indicator may be simple marks. In some embodiments, the arrangement indicating unit may be formed in the form of a protrusion structure for guiding the position of the electronic device 200. In addition, in some embodiments, the arrangement indicator is formed in the form of a magnetic body such as a magnet mounted to the lower portion of the interface surface, the coil by the mutual attraction with the magnetic material of the other pole mounted inside the electronic device 200 They may be guided to achieve a suitable arrangement.

Meanwhile, the wireless power transmitter 100 may be formed to include one or more transmission coils. The wireless power transmitter 100 may increase power transmission efficiency by selectively using a part of coils suitably arranged with the receiving coil 2911a of the electronic device 200 among the one or more transmitting coils. A wireless power transmitter 100 including the one or more transmission coils will be described below with reference to FIG. 5.

Hereinafter, the configuration of the wireless power transmitter and the electronic device of the inductive coupling method applicable to the embodiments disclosed herein will be described in detail.

Figure 4-Wireless power transmitter and electronic device of the inductive coupling method

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. A configuration of the power transmitter 110 included in the wireless power transmitter 100 will be described with reference to FIG. 4A, and the power supply unit 290 included in the electronic device 200 will be described with reference to FIG. 4B. The configuration of 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 transmitting coil 1111a may be implemented in a planar spiral type. Also, in some embodiments, the transmitting coil 1111a may be implemented in a cylindrical solenoid type.

The inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform. The alternating current transformed by the inverter 1112 drives a resonant circuit including the transmitting coil 1111a and a capacitor (not shown) so that a magnetic field is formed in the transmitting coil 1111a. .

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 transfer by the inductive coupling method is an alignment and distance between the wireless power transmitter 100 and the electronic device 200 including primary and secondary coils. Because it is affected. In particular, the location determiner 1114 may be used when the electronic device 200 does not exist within an active area of the wireless power transmitter 100.

Therefore, the positioning unit 1114 has a distance between the centers of the transmitting coil 1111a of the wireless power transmitter 100 and the receiving coil 2911a of the electronic device 200 within a predetermined range. And a driving unit (not shown) for moving the transmitting coil 1111a so as to be within the limit, or rotating the transmitting coil 1111a so that the center of the transmitting coil 1111a and the receiving coil 2911a overlap. Can be.

To this end, the wireless power transmitter 100 may further include a position detection unit (not shown) made of a sensor for detecting the position of the electronic device 200, and the power transmission control unit 112. ) May control the location determiner 1114 based on the location information of the electronic device 200 received from the location sensor.

In addition, for this purpose, the power transmission control unit 112 receives control information on the arrangement or distance from the electronic device 200 through the modulator 113 and based on the received control information on the arrangement or distance. The position determiner 1114 may be controlled by the controller.

If the power converter 111 is configured to include a plurality of transmission coils, the position determiner 1114 may determine which of the plurality of transmission coils will be used for power transmission. The configuration of the wireless power transmitter 100 including the plurality of transmission coils will be described later with reference to FIG. 5.

On the other hand, the power converter 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 of the wireless power transmitter 100 monitors a current or voltage flowing through the transmission coil 1111a. The power sensing unit 1115 is for checking whether the wireless power transmitter 100 operates normally. The power sensing unit 1115 detects a voltage or current of a power supplied from the outside and determines whether the detected voltage or current exceeds a threshold. You can check it. Although not shown, the power sensing unit 1115 compares a resistance for detecting a voltage or current of a power source supplied from an external source with a threshold value of a voltage value or a current value of the detected power source, and outputs a comparison result. It may include a comparator. Based on the check result of the power sensing unit 1115, the power transmission control unit 112 may control a switching unit (not shown) to cut off 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 receiving coil (Rx coil) 2911a and a rectifier circuit 2913.

The current is induced in the receiving coil 2911a by the change in the magnetic field formed from the transmitting coil 1111a. An implementation 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.

Meanwhile, the power supply unit 290 may be configured to 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 rectified by the rectifying circuit 2913, and as a result of the monitoring, the voltage and / or current of the rectified power is increased. When the threshold value is exceeded, the power reception control unit 292 transmits a power control message to the wireless power transmitter 100 to deliver appropriate power.

5-a wireless power transmitter comprising one or more transmitting coils

Referring to FIG. 5, the power converter 111 of the wireless power transmitter 100 according to the exemplary embodiments disclosed herein may be composed of 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 on the upper surface of the interface is detected, the power transmission control unit 112 may take into account the sensed position of the electronic device 200 and the one or more transmission coils 1111a-1 to. The multiplexer 1113 may be controlled to connect coils which may be in inductive coupling relationship with the receiving coil 2911a of the electronic device 200 among the 1111a-n.

To this end, the power transmission control unit 112 may obtain location information of the electronic device 200. In some embodiments, the power transmission control unit 112 may acquire the position of the electronic device 200 on the interface surface by the position sensing unit (not shown) included in the wireless power transmitter 100. have. In another embodiment, the power transmission control unit 112 uses the one or more transmission coils 1111a-1 to 1111a-n to respectively indicate a power control message indicating the strength of a wireless power signal from an object on the interface surface; Obtaining location information of the electronic device 200 by receiving a power control message indicating the identification information of the object and determining which one of the one or more transmission coils is close to the location of the one or more transmission coils based on the received result. have.

Meanwhile, the active area may be a portion of the interface surface, and may mean a portion through which a high efficiency magnetic field may pass when the wireless power transmitter 100 wirelessly transfers power 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 active area based on the detected position of the electronic device 200, establishes a connection of a main cell corresponding to the active area, and receives the electronic device 200. The multiplexer 1113 may be controlled such that the coil 2911a and the coils belonging to the main cell may be placed in an inductive coupling relationship.

Meanwhile, when one or more electronic devices 200 are disposed on an interface surface of the wireless power transmitter 100 configured to include the one or more transmission coils 1111a-1 to 1111a-n, the power transmission controller ( 112 may control the multiplexer 1113 so that coils belonging to a main cell corresponding to the location of each electronic device are in inductive coupling relationship, respectively. Accordingly, the wireless power transmitter 100 may wirelessly transmit power to one or more electronic devices by forming a wireless power signal using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the electronic devices. In this case, the wireless power transmitter 100 may transmit power by setting different power transfer methods, efficiency, characteristics, etc. for each electronic device. Power delivery for one or more electronic devices is described below with reference to FIG. 28.

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

Hereinafter, a method of transmitting power by a wireless power transmitter according to embodiments supporting a resonance coupling method will be described with reference to FIGS. 6 to 8.

Figure 6-Resonant coupling scheme

6 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to embodiments supporting a resonance 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 electrical circuits, inductors and capacitors can be used to create resonant circuits.

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 formed 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 electromagnetically resonate with each other. This is also called energy coupling or energy tail.

The resonance coupling method disclosed herein may use an electromagnetic wave having a low frequency. When transmitting power using an electromagnetic wave having a low frequency, only a magnetic field is affected to a region located within a single wavelength of the electromagnetic wave. do. This may be referred to as magnetic coupling or magnetic resonance. Such magnetic resonance may occur when the wireless power transmitter 100 and the electronic device 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 electromagnetic wave exposure. In addition, an energy tail is formed due to the resonance, and thus the power transmission form is non-radiative. For this reason, the radioactive problem that can be commonly caused by transmitting power using electromagnetic waves can be solved.

The resonance coupling method may be a method of transmitting power using electromagnetic waves having a low frequency as described above. Therefore, the transmission coil 1111b of the wireless power transmitter 100 may form a magnetic field or electromagnetic wave for transmitting power in principle, but in the following description of the magnetic resonance side, that is, the magnetic field for the resonance coupling method. It will be described in terms of power transfer by.

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

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 may be determined by the number of rotations of the coil, etc., and the capacitance may be determined by the distance, area, etc. between the coils. In order to determine the resonance frequency, a capacitive resonance forming circuit other than the coil may be connected.

Referring to FIG. 6, in the case of embodiments in which power is wirelessly transmitted according to a resonance coupling method, the power converter 111 of the wireless power transmitter 100 may include a transmission coil (Tx coil) in which a magnetic field is formed. 1111b and a resonance forming circuit 1116 connected to the transmitting coil 1111b and configured to determine a specific vibration frequency. The resonance forming circuit 1116 may be implemented using capacitors, and the specific vibration frequency is determined based on the inductance of the transmission coil 1111b and the capacitance of the resonance forming circuit 1116. .

The circuit elements of the resonance forming circuit 1116 may be formed in various forms so that the power converter 111 may form a magnetic field, and may be connected in parallel with the transmitting coil 1111b as shown in FIG. 6. It is not limited to.

In addition, the power receiver 291 of the electronic device 200 includes a resonance forming circuit 2912 and a Rx coil configured to cause a resonance phenomenon by a magnetic field formed in the wireless power transmitter 100. 2911b). That is, the resonance forming circuit 2912 may also be implemented using a capacitive circuit, and the resonance forming circuit 2912 is based on the inductance of the receiving coil 2911b and the capacitance of the resonance forming circuit 2912. The resonance frequency is determined to be equal to the resonance frequency of the formed magnetic field.

The circuit elements of the resonance forming circuit 2912 may be configured in various forms such that the power receiver 291 may cause resonance by the magnetic field, and is connected in series with the receiving coil 2911b as shown in FIG. 6. It is not limited to the form.

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

According to embodiments supporting a wireless power transmission method by resonance coupling, when the wireless power transmitter 100 and the electronic device 200 resonate at the same frequency, electromagnetic waves are transmitted through a near field, Is different, there is no energy transfer between the devices.

Therefore, the efficiency of the wireless power transfer by the resonance coupling method has a large influence on the frequency characteristic, while the arrangement and the distance between the wireless power transmitter 100 and the electronic device 200 including each coil. The effect is relatively small compared to the inductive coupling method.

Hereinafter, the configuration of the wireless power transmitter and the electronic device of the resonance coupling method applicable to the embodiments disclosed herein will be described in detail.

Figure 7-Wireless power transmitter of the resonance coupling method

A configuration of the power transmitter 110 included in the wireless power transmitter 100 will be described with reference to FIG. 7A.

The power converter 111 of the wireless power transmitter 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. When the AC coil is applied to the transmission coil 1111b and the resonance forming circuit 1116, vibration may occur. In this case, the transmission coil 1111b may vibrate based on the inductance of the transmission coil 1111b and the capacitance of the resonance forming circuit 1116. The frequency can be determined.

To this end, the inverter 1112 transforms the DC input obtained from the power supply unit 190 into an AC waveform, and the modified 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 adjusting unit 1117 may be configured to include a motor capable of changing capacitance by adjusting a distance between capacitors included in the resonance forming circuit 1116. 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. In addition, in some embodiments, the frequency adjusting unit 1117 may be configured to include active elements that determine the capacitance and / or inductance.

On the other hand, the power converter 111 may be configured to further include a power sensing unit 1115. Operation of the power sensing unit 1115 is the same as described above.

A configuration of the power supply unit 290 included in the electronic device 200 will be described with reference to FIG. 7B. As described above, the power supply unit 290 may be configured to include the Rx coil 2911b and the resonance forming circuit 2912.

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.

In addition, the power receiver 291 may be configured to 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 in the same manner as described above.

8-a wireless power transmitter including one or more transmitting coils

8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to embodiments supporting a resonance coupling scheme.

Referring to FIG. 8, the power conversion unit 111 of the wireless power transmitter 100 according to the embodiments disclosed herein is connected to one or more transmission coils 1111b-1 to 1111b-n and respective transmission coils. It may be configured to include the resonance forming circuits 1116-1 to 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 transmitting coils 1111b-1 to 1111b-n may be set to have the same resonance frequency. In some embodiments, some of the one or more transmitting coils 1111b-1 to 1111b-n may be set to have different resonance frequencies, which are the one or more transmitting coils 1111b-1 to 1111b-n. And the inductance and / or capacitance in which the resonance forming circuits 1116-1 to 1116-n respectively connected to each other are determined.

Meanwhile, when one or more electronic devices 200 are disposed in an active area or a sensing area of the wireless power transmitter 100 configured to include the one or more transmission coils 1111b-1 to 1111b-n, the power transmission. The controller 112 may control the multiplexer 1113 to be in a different resonance coupling relationship for each electronic device. Accordingly, the wireless power transmitter 100 may wirelessly transmit power to one or more electronic devices by forming a wireless power signal using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the electronic devices. In this case, the wireless power transmitter 100 may transmit power by setting different power transmission schemes, resonant frequencies, efficiencies, and characteristics for each electronic device. Power delivery for one or more electronic devices is described below with reference to FIG. 28.

To this end, the frequency adjusting unit 1117 changes inductance and / or capacitance of the resonance forming circuits 1116-1 to 1116-n connected to the one or more transmitting coils 1111b-1 to 1111b-n, respectively. It can be configured to be.

Figure 9-Wireless power transmitter implemented as a charger

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

As can be seen with reference to Figure 9, the wireless power transmitter 100, in addition to the power transmission unit 110 and the power supply unit 190 that supports one or more of the above-described inductive coupling method and the resonance coupling method, The sensor unit 120, the communication unit 130, an output unit 140, a memory 150, and a controller 180 may be further included.

The controller 180 controls the power converter 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 detecting a position of the electronic device 200. The location information detected by the sensor unit 120 may be used to efficiently transmit power by the power converter 110.

For example, in the case of wireless power transfer according to embodiments supporting the inductive coupling method, the sensor unit 120 may operate as a detection unit, and the position information detected by the sensor unit 120 may be It may be used to move or rotate the transmission coil 1111a in the power converter 110.

In addition, for example, the wireless power transmitter 100 according to the embodiments including the one or more transmission coils described above may be based on the location information of the electronic device 200. Coils that may be placed in an inductive coupling relationship or a resonance coupling relationship with the receiving coil of 200 may be determined.

Meanwhile, the sensor unit 120 may be configured to monitor whether the electronic device 200 approaches a chargeable area. The proximity detection function of the sensor unit 120 may be performed separately from or combined with the function of the power transmission control unit 112 in the power transmission unit 110 detecting whether the electronic device 200 approaches. .

The communication unit 130 performs wired and wireless data communication with the electronic device 200. The communication unit 130 may include an electronic component for any one or more 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 the display unit 141 and the sound output unit 142. The display unit 141 may include a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (LCD). It may include at least one of a flexible display, a 3D display. The display unit 141 may display a charging state under the control of the controller 180.

The memory 150 may include 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 (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory, It may include a storage medium of at least one type of magnetic disk, optical disk. The wireless power transmitter 100 may operate in connection with a web storage that performs a storage function of the memory 150 on the Internet. The memory 150 may store a program or instructions for performing the above-described functions of the wireless power transmitter 100. The controller 180 may execute a program or commands stored in the memory 150 to wirelessly transmit power. Other components included in the wireless power transmitter 100 (eg, the controller 180) 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-wireless power receiver implemented as 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, The interface unit 270 may further include 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 enables wireless communication between the terminal 200 and the wireless communication system, between the terminal 200 and the network where the terminal 200 is located, or between the terminal 200 and the wireless power transmitter 100. It may include 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 range communication module 214, a location information module 215, and the like. .

The broadcast receiving module 211 receives a broadcast signal 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 not only a TV broadcast signal, a radio broadcast signal, and a data broadcast signal, but also a broadcast signal having a data broadcast signal combined with a TV broadcast signal or a radio broadcast signal.

The broadcast related information may mean information related to a broadcast channel, a broadcast program, or 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).

The broadcast receiving module 211 may include, for example, Digital Multimedia Broadcasting-Terrestrial (DMB-T), Digital Multimedia Broadcasting-Satellite (DMB-S), Media Forward Link Only (MediaFLO), and Digital Video Broadcast (DVB-H). Digital broadcast signals can be received using digital broadcasting systems such as Handheld and Integrated Services Digital Broadcast-Terrestrial (ISDB-T). 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 with 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 according to transmission and reception of a voice call signal, a video call call signal, or a text / multimedia message.

The wireless internet module 213 refers to a module for wireless internet access and may be built in or external 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 refers to 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), ZigBee®, and the like 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 short range communication module 214 may establish a data communication connection with the wireless power transmitter 100.

Through the established data communication, the wireless internet module 213 or the short-range communication module 214 transmits the audio signal through the short-range communication module when there is an audio signal to be output while transmitting power wirelessly. It may be transmitted to the wireless power transmitter 100. In addition, through the established data communication, when there is information to be displayed, the wireless internet module 213 or the short range communication module 214 may transmit the information to the wireless power transmitter 100. 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 transmitter 100. In addition, the wireless Internet module 213 or the short-range communication module 214 transmits the identification information of the mobile terminal 200 (eg, a phone number or device name in the case of a mobile phone) through the established data communication. The transmission device 100 may transmit.

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

Referring to FIG. 10, the A / V 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 may 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. Two or more cameras 221 may be provided according to a usage environment.

The microphone 222 receives an external sound signal by a microphone in a call mode, a recording mode, a voice recognition mode, etc., and processes the external sound signal into electrical voice data. The processed voice data may be converted into a form transmittable to the mobile communication base station through the mobile communication module 212 and output in the call mode. The microphone 222 may implement various noise removing algorithms for removing noise generated while 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 pressure / capacitance), 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 may detect the presence or absence of an object approaching the mobile terminal 200 or an object present in the vicinity of the mobile terminal 200 without mechanical contact. The proximity sensor 241 may detect a proximity object by using a change in an alternating magnetic field or a change in a static magnetic field, or by using a change rate of capacitance. The proximity sensor 241 may be provided with two or more according to the configuration aspect.

The pressure sensor 242 may detect whether pressure is applied to the mobile terminal 200 and the magnitude of the pressure. The pressure sensor 242 may be installed at a portion of the mobile terminal 200 that requires the detection of pressure according to the use environment. If the pressure sensor 242 is installed in the display unit 251, a touch input through the display unit 251 and a pressure greater than the touch input are generated according to the signal output from the pressure sensor 242. The pressure touch input applied can be identified. In addition, according to the signal output from the pressure sensor 242, it can also know the magnitude of the pressure applied to the display unit 251 when the pressure touch input.

The motion sensor 243 detects the position or movement of the mobile terminal 200 using an acceleration sensor, a gyro sensor, or the like. The acceleration sensor that can be used for the motion sensor 243 is an element that converts the acceleration change in one direction into an electrical signal. Accelerometers are usually configured by mounting two or three axes in one package. Depending on the environment, only one axis may be needed. Therefore, if for some reason it is necessary to use the acceleration sensor in the X-axis or Y-axis direction instead of the Z-axis direction, the acceleration sensor may be mounted on the main substrate using a separate engraving substrate. In addition, the gyro sensor is a sensor for measuring the angular velocity of the mobile terminal 200 performing a rotational movement, and may 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 is used to generate an output related to sight, hearing, or tactile sense, and includes a display unit 251, an audio output module 252, an alarm unit 253, and a haptic module 254. Can be.

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 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (flexible). and at least one of a 3D display.

Some of these displays can be configured to be transparent or light transmissive so that they can be seen from the outside. 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 the object located behind the terminal body through the area occupied by the display unit 251 of the terminal body.

According to an implementation form of the terminal 200, two or more display units 251 may exist. For example, a plurality of display units may be spaced apart or integrally disposed on one surface of the terminal 200, or may be disposed on different surfaces.

When the display unit 251 and a sensor for detecting a touch operation (hereinafter, referred to as a touch sensor) form a mutual layer structure (hereinafter referred to as a touch screen), the display unit 251 may be used in addition to an output device. Can also be used as an input device. The touch sensor may have, for example, a form of a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in pressure applied to a specific portion of the display unit 251 or capacitance generated in a specific portion of the display unit 251 into an electrical input signal. The touch sensor may be configured to detect not only the position and area of the touch but also the pressure at the 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. As a result, the controller 280 may determine which area of the display unit 251 is touched.

The proximity sensor 241 may be disposed in the inner region of the terminal covered by the touch screen or near 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 an object present in the vicinity without using a mechanical contact by using an electromagnetic force or infrared rays. Proximity sensors have a longer life and higher utilization than touch sensors.

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. When the touch screen is capacitive, the touch screen is configured to detect the proximity of the pointer by the change of the electric field according to the proximity of the pointer. 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 proximity touch is performed by the pointer on the touch screen refers to a position where the pointer is perpendicular to the touch screen when the pointer is in proximity proximity.

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

The sound output module 252 may output audio data received from the wireless communication unit 210 or stored in the memory 260 in a call signal reception, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, and the like. 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 occurrence of an event of the terminal 200. 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 notifying an occurrence of an event by vibration, in addition to a video signal or an audio signal. The video signal or the audio signal may also be output through the display unit 251 or the audio output module 252, so that they 251 and 252 may be classified as part of the alarm unit 253.

The haptic module 254 generates various haptic effects that a user can feel. Vibration is a representative example of the haptic effect generated by the haptic module 254. The intensity and pattern of vibration generated by the haptic module 254 can be controlled. For example, different vibrations may be synthesized and output or may be sequentially output.

In addition to the vibration, the haptic module 254 may be used to stimulate a pin array that vertically moves with respect to the contact skin surface, a jetting force or suction force of air through an injection or inlet, grazing to the skin surface, contact of an electrode, and electrostatic force. Various tactile effects can be generated, such as effects by the endothermic and the reproduction of a sense of cold using the elements capable of endotherm or heat generation.

The haptic module 254 may not only deliver the haptic effect through direct contact, but may also be implemented to allow the user to feel the haptic effect through a muscle sense such as a finger or an arm. Two or more haptic modules 254 may be provided according to a configuration aspect of the terminal 200.

The memory 260 may store a program for the operation of the controller 280, and may temporarily store input / output data (eg, a phone book, a message, a still image, a video, etc.). The memory 260 may store data regarding vibration and sound of various patterns output when a touch input on the touch screen is performed.

In some embodiments, an operating system (not shown) in the memory 260, a module performing a function of the wireless communication unit 210, a module operating in conjunction with the user input unit 230, and an A / V input unit 220. Software components including a module operating in conjunction with a module operating in conjunction with the output unit 250 may be stored. 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.

In addition, the memory 260 may store a setting program related to wireless power transmission or wireless charging. The setting program may be executed by the controller 280.

In addition, the memory 260 may store an application related to wireless power transmission (or wireless charging) downloaded from an application providing server (eg, an app store). The wireless power transmission related application is a program for controlling wireless power transmission, and the electronic device 200 wirelessly receives power from the wireless power transmitter 100 through the corresponding program or the wireless power transmitter 100. Connection for data communication).

The memory 260 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or xD memory), RAM (Random Access Memory, RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory, Magnetic It may include a storage medium of at least one type of disk, optical disk. The terminal 200 may operate in association with a web storage that performs a storage function of the memory 260 on the Internet.

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

The identification module is a chip that stores various information for authenticating the use authority of the terminal 200, and includes a user identification module (UIM), a subscriber identity module (SIM), and a universal user authentication module (Universal). Subscriber Identity Module, USIM) and the like. A device equipped with an identification module (hereinafter referred to as an 'identification device') may be manufactured in the form of a smart card. Therefore, the identification device may be connected to the terminal 200 through a port.

When the terminal 200 is connected to an external cradle, the interface unit may be a passage for supplying power from the cradle to the terminal 200, or various command signals input from the cradle by a user may be transmitted to the terminal. It can be a passage. 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, perform related control and processing for voice calls, data communications, video calls, and the like. The controller 280 may include a multimedia module 281 for playing multimedia. The multimedia module 281 may be implemented in the controller 280 or may be implemented separately from the controller 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 controller 280 may perform a pattern recognition process for recognizing a writing input or a drawing input performed on the touch screen as text and an image, respectively.

The controller 280 performs wired charging or wireless charging according to a user input or an internal input. Here, the internal input is a signal indicating that the induced current generated from the secondary coil inside the terminal is detected.

When the above-described wireless charging is performed, an operation of the controller 280 to control each component will be described in detail with reference to the operation state of FIG. 14. As described above, the power reception control unit 292 in the power supply unit 290 may be included in the control unit 280, and the operation by the power reception control unit 292 in the present specification is the control unit 280 Can be understood as performing.

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 wireless charging of the battery 299.

Although the present disclosure discloses a mobile terminal as an apparatus for receiving power wirelessly as an example, except that the configuration according to the embodiments described herein is applicable only to the mobile terminal, it may be applied to a fixed terminal such as a digital TV or a desktop computer. It will be readily apparent to one skilled in the art that the present invention may be applied.

Figure 11-Backscatter Modulation

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.

Referring to FIG. 11A, since the wireless power signal formed by the power converter 111 forms a closed loop in a magnetic field or an electromagnetic field, the electronic When the device 200 modulates the wireless power signal while receiving the wireless power signal, the wireless power transmitter 100 may detect the modulated wireless power signal. The demodulation unit 113 may demodulate the sensed wireless power signal and decode the packet from the demodulated wireless power signal.

Meanwhile, a modulation method used for communication between the wireless power transmitter 100 and the electronic device 200 may be amplitude modulation. As described above, in the amplitude modulation method, the modulation / demodulation unit 293 on the side of the electronic device 200 changes the amplitude of the wireless power signal 10a formed by the power conversion unit 111 so that the wireless power transmitter Modulation and demodulation unit 293 on the (100) side may be a backscatter modulation scheme for detecting the amplitude of the modulated wireless power signal 10b.

Specifically, referring to FIG. 11B, the power reception control unit 292 of the electronic device 200 may load the wireless power signal 10a received through the power reception unit 291 in the load demodulation unit 293. Modulate by changing (Impedance). The power reception control unit 292 modulates the wireless power signal 10a to include a packet including a power control message to be transmitted to the wireless power transmitter 100.

Thereafter, the power transmission control unit 112 of the wireless power transmitter 100 demodulates the modulated wireless power signal 10b through an envelope detection process, and decodes the detected signal 10c. It decodes into digital data 10d. The demodulation process detects that a current or voltage flowing through the power converter 111 is divided into two states, an HI phase and a LO state, by the modulated wireless power signal. The electronic device 200 acquires a packet to be transmitted based on digital data classified according to FIG.

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

Figure 12-Bit encoding, Byte Format

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.

Meanwhile, the power transmission control unit 112 may obtain data in units of bytes using a byte format constituting a packet from the detected bit string 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 for notifying the start of the byte and a stop bit for notifying the end of the byte, and include data bits b0 to b7 between the start bit and the end bit. In addition, a parity bit may be added to check for errors in the data. The byte data constitutes a packet including a power control message.

Figure 13-Packet Format

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 to synchronize the data received by the wireless power transmitter 100 and accurately detect the start bit of the header 520. The preamble 510 may be configured such that the same bit is repeated. For example, the preamble 510 may be configured such that 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 constant 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 size determined according to the type.

The checksum 540 is used to detect an error that may occur in the header 520 and the message 530 while a power control message is being transmitted. The header 520 and the message 530 except for the preamble 510 for synchronization and the checksum 540 for error checking may be referred to as a command packet (command_packet).

Fig. 14-Phases

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

FIG. 14 illustrates operation states of the wireless power transmitter 100 and the electronic device 200 according to the embodiments disclosed herein. 15 to 19 illustrate a structure of packets including a power control message between the wireless power transmitter 100 and the electronic device 200.

Referring to FIG. 14, an operation state of the wireless power transmitter 100 and the electronic device 200 for wireless power transmission may include a selection phase 610, a detection phase 620, and an identification state. And a configuration state (Identification and Configuration Phase) 630 and a power transfer phase 640.

In the selection state 610, the wireless power transmitter 100 detects whether objects exist within a range in which power can be transmitted wirelessly, and in the detection state 620, the wireless power transmitter ( 100 sends a detection signal to the detected object, and the electronic device 200 sends a response to the detection signal.

In addition, in the identification and setting state 630, the wireless power transmitter 100 identifies the selected electronic device 200 through previous states and obtains 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 transmitter 100 in the selection 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. Compared to the detection state 620, the detection process for the selection of the electronic device 200 in the selection state 610, instead of receiving a response from the electronic device 200 using a power control message, The power conversion unit of the wireless power transmitter 100 detects a change in the amount of power for forming the wireless power signal and checks 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. In addition, the wireless power transmitter 100 may distinguish between the electronic device 200 capable of wirelessly transmitting power and other objects (eg, a key, a coin, etc.) among objects in the sensing area. .

As described above, since distances to which power can be wirelessly transmitted are different according to the inductive coupling method and the resonance coupling method, the sensing areas in which the object is detected in the selection state 610 may be different from each other.

First, in embodiments in which power is transmitted according to an inductive coupling method, the wireless power transmitter 100 in the selection state 610 may monitor an interface surface (not shown) to detect placement and removal of objects. have.

In addition, the wireless power transmitter 100 may detect the position of the electronic device 200 placed on the interface surface. 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 transmitter 100 may determine a coil to be used for wireless power transmission based on the detected position of the electronic device 200 obtained through the above process.

In addition, in embodiments in which power is transmitted according to a resonance coupling method, the wireless power transmitter 100 in the selection state 610 may have at least one of a frequency, a current, and a voltage of the power converter due to an object in the sensing area. The object can be detected by detecting the change.

Meanwhile, the wireless power transmitter 100 in the selection state 610 may detect an object by at least one of the detection methods according to the inductive coupling method and the resonance coupling 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.

Meanwhile, the wireless power transmitter 100 in the selected state 610 performs digital detection, identification, setting, and power transmission in a wireless power signal formed to detect an object and subsequent states 620, 630, and 640. The wireless power signal to be formed may have different characteristics such as frequency and strength. This is because the selected state 610 of the wireless power transmitter 100 corresponds to an idle phase for detecting an object, so that the wireless power transmitter 100 may reduce power consumption in standby or may be effective. This is to generate a signal specialized for detecting an object.

2) Ping Phase

The wireless power transmitter 100 in the detection state 620 detects the electronic device 200 existing in the detection area through a power control message. Compared to the detection process of the electronic device 200 using the characteristics of the wireless power signal in the selection state 610, the detection process in the detection state 620 may be referred to as a digital ping process.

In the detection state 620, the wireless power transmitter 100 forms a wireless power signal for detecting the electronic device 200, demodulates a wireless power signal modulated by the electronic device 200, Obtain 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 transmitter 100 may recognize the electronic device 200 that is the target of power transmission by receiving a power control message corresponding to the 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 transmitter 100 may generate the detection signal generated by applying the power signal of the specific operation point for a predetermined time and attempt to receive a 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 receives a signal strength packet 5100 including a message indicating the strength of the received wireless power signal as a response to the detection signal as shown in FIG. 15. Can transmit The packet 5100 may be configured to include a header 5120 indicating that the packet indicates a signal strength and a message 5130 indicating the strength of a power signal received by the electronic device 200. The strength of the power signal in the message 5130 may be a value indicating a degree of coupling for inductive coupling or resonance coupling for power transmission between the wireless power transmitter 100 and the electronic device 200.

After receiving the response message to the detection signal, the wireless power transmitter 100 discovers the electronic device 200, the wireless power transmitter 100 may extend the digital detection process to enter the identification and detection state 630. That is, after discovering the electronic device 200, the wireless power transmitter 100 may receive a power control message required in the identification and detection state 630 by maintaining a power signal of the specific operation point.

However, when the wireless power transmitter 100 does not find the electronic device 200 capable of delivering power, the operating state of the wireless power transmitter 100 may return to the selection state 610. .

3) Identification and Configuration Phase

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

In the identification 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 the packet indicates identification information and a message 5230 including identification information of the electronic device. The message 5230 includes information (2531 and 5232) indicating the version of the protocol for wireless power transmission, information (5233) identifying the manufacturer of the electronic device 200, information (5234) indicating the presence or absence of the expansion device identifier. And a basic device 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 extended device identifier is used as described above, information based on the manufacturer's identification information 5333, the basic device identifier 5235, and the extended device identifier 5330 may be used to identify the electronic device 200. Can be used.

In the identification and setting state 630, the electronic device 200 may transmit a power control message including information on the expected maximum power. To this end, the electronic device 200 may transmit, for example, a configuration packet 5400 as illustrated in FIG. 17. 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 embodiments of the present disclosure, the electronic device 200 may transmit a power control message including its required power information or profile information to the wireless power transmitter 100. In some embodiments, the requested power information or the profile information of the electronic device 200 may be included in the configuration packet 5400 as shown in FIG. 17 and transmitted. In some embodiments, the required power information or the profile information of the electronic device 200 may be included in a packet for separate configuration and transmitted.

The wireless power transmitter 100 may generate a power transfer contract used to charge power with the electronic device 200 based on the identification information and / or configuration information. The power transfer protocol may include limits of parameters that determine power transfer characteristics in the power transfer state 640.

The wireless power transmitter 100 may end the identification and setting state 630 before returning to the power transfer state 640 and return to the selection state 610. For example, the wireless power transmitter 100 may end the identification and setting state 630 to find another electronic device that can receive power wirelessly.

4) Power Transfer Phase

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

The wireless power transmitter 100 may receive a power control message from the electronic device 200 while transmitting power, and adjust a characteristic of power applied to the transmission coil in response to the received power control message. . For example, the 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. 18. 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. The wireless power transmitter 100 cancels and selects the power transmission when the parameters are monitored, when the power transmission with the electronic device 200 violates the limitations included in the power transfer protocol. It may return to state 610.

The wireless power transmitter 100 may end the power transfer state 640 based on a power control message transmitted from the electronic device 200.

In some embodiments, the power control requesting to stop the wireless power transfer to the wireless power transmitter 100 when the charging of the battery is completed while the electronic device 200 is charging the battery using the transferred power. You can pass a 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.

In addition, in some embodiments, the electronic device 200 may transmit a power control message requesting renegotiation or reconfigure to update a power transfer protocol that has already been generated. The electronic device 200 may transmit a message for requesting renegotiation of the power transfer protocol when a greater amount or less power is required than the amount of currently transmitted power. 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 transfer stop code includes charge complete, internal fault, over temperature, over voltage, over current, battery failure, reset, It may indicate one of a no response or an unknown error.

Structure of unidirectional communication between a wireless power transmitter and a plurality of electronic devices

In FIG. 20, the plurality of electronic devices is illustrated as two, and the plurality of electronic devices are the first electronic device 200a and the second electronic device 200b.

Referring to FIG. 20, as described above, the wireless power transmitter 100 may be 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 to convert the wireless power signal into a plurality of electronic devices, the first electronic device 200a and The second electronic device 200b may be simultaneously delivered to the second electronic device 200b.

According to one embodiment, the power converter 111 forms a magnetic field that changes to induce a current in the secondary coil of the first electronic device 200a and the second electronic device 200b according to the inductive coupling method. It may be configured to include at least one primary coil.

According to an embodiment, the power converter 111 may have a magnetic field having one or more resonant frequencies in order to generate a resonance phenomenon in the first electronic device 200a and the second electronic device 200b according to a resonance coupling method. It may be configured to include one or more coils (or antennas) to form a.

The first electronic device 200a and the second electronic device 200b may be configured to include

power supply units

290a and 290b. The

power supply units

290a and 290b may supply power required for the operation of the first electronic device 200a and the second electronic device 200b. The

power supply units

290a and 290b may include a

power receiver

291a and 291b and a

power reception controller

292a and 292b.

The

power receivers

291a and 291b may receive power wirelessly transmitted from the wireless power transmitter 100. To this end, the

power receiver

291a, 291b may be configured to include one or more coils for receiving a wireless power signal transmitted in the form of a magnetic or electromagnetic field having a vibration characteristic.

According to an embodiment, the

power receivers

291a and 291b may include one or more secondary coils in which current is induced by a magnetic field that is changed as a component according to an inductive coupling method.

According to an embodiment, the

power receivers

291a and 291b may include one or more coils and one or more resonance forming circuits in which a resonance phenomenon is generated by a magnetic field having one or more resonance frequencies as a component according to a resonance coupling scheme. Can be.

In order to wirelessly supply power to the first electronic device 200a and the second electronic device 200b, the wireless power transmitter 100 may include the first electronic device 200a and the second electronic device 200b. May receive information about. Information about the first electronic device 200a and the second electronic device 200b may be transmitted as a power control message in the form of digital data.

In order to transmit the power control message in the form of the digital data, the

power reception controllers

292a and 292b may modulate the wireless power signal such that a packet including the power control message is included while the wireless power signal is received. Can be. Hereinafter, the modulated wireless power signal is referred to as a response signal of the electronic device.

The wireless power transmitter 100 may detect a modulated wireless power signal. In this case, the wireless power transmitter 100 may demodulate the sensed wireless power signal and decode the packet from the demodulated wireless power signal.

Meanwhile, the wireless power transmitter 100 may use an amplitude modulation method as a modulation method for communication with the first electronic device 200a and the second electronic device 200b.

As described above, in the amplitude modulation scheme, the modulation and demodulation unit on the side of the first electronic device 200a and the second electronic device 200b is configured to convert the amplitude of the wireless power signal formed by the wireless power transmitter 100 into the second electronic device 200b. 293a and 293b may be a backscatter modulation scheme in which the modulator 113 on the wireless power transmitter 100 detects an amplitude of the modulated wireless power signal.

According to one embodiment, in the detection state 620, the wireless power transmitter 100 forms a wireless power signal for detecting the first electronic device 200a and the second electronic device 200b, Demodulate the wireless power signal modulated by the first electronic device 200a and the second electronic device 200b, and obtain a power control message in the form of digital data corresponding to a response to the detection signal from the demodulated wireless power signal. can do.

In addition, the wireless power transmitter 100 recognizes the first electronic device 200a and the second electronic device 200b that are subject to power transmission by receiving a power control message corresponding to the response to the detection signal. can do.

According to an embodiment, in the identification and setting state 630, the wireless power transmitter 100 may identify identification information and / or setting information transmitted by the first electronic device 200a and the second electronic device 200b. Can be controlled to receive and efficiently transmit power.

In the identification and setting state 630, the first electronic device 200a and the second electronic device 200b may transmit a power control message including their own identification information.

Therefore, in order to supply wireless power to the first electronic device 200a and the second electronic device 200b, the wireless power transmitter 100 may use the first electronic device 200a and the second electronic device 200b. It may be important to receive information about) without error.

Therefore, in order for the wireless power transmitter 100 to receive the information on the first electronic device 200a and the second electronic device 200b without error, the first electronic device 200a and the second electronic device. There should be no collision between the response signals transmitted by 200b.

A possibility of collision and a collision process between the response signals transmitted by the first electronic device 200a and the second electronic device 200b will be described later with reference to FIGS. 21 and 22.

Referring to FIG. 21, the power converter 111 may include an inverter 1112, and the inverter 1112 may convert a DC input obtained from the power supply unit 190 into an AC waveform. , 310).

The alternating current 310 modified by the inverter 1112 drives a resonant circuit including a

transmission coil

1111a or 1111b in the case of a resonance coupling method and a capacitor (not shown). The magnetic field may be formed in the

transmission coil

1111a or 1111b in the case of the resonance coupling method.

The power

reception control units

292a and 292b on the side of the first electronic device 200a and the second electronic device 200b modulate the wireless power signal by changing the load impedance in the modulation and

demodulation unit

293a and 293b. can do. The load impedance may be composed of passive elements and active elements. For example, the passive element may be a resistor, and the active element may be a transistor. FIG. 21 illustrates a case in which the first electronic device 200a and the second electronic device 200b include resistors 340 and 340 'and transistors 350 and 350'.

When the first electronic device 200a and the second electronic device 200b simultaneously transmit the response signals 320 and 330 to the wireless power transmitter 100, the modulated radio may be used in a backscatter unidirectional communication method. A problem of collision of power signals may occur.

That is, when the response signals 320 and 330 are transmitted within the same time interval, waveforms of the modulated wireless power signals 320 and 330 may overlap to cause distortion of the waveform. As a result, the wireless power transmitter 100 may not decode the response signals into digital data and thus may not obtain a power control message in the form of digital data.

Hereinafter, a process in which response signals of the plurality of electronic devices collide with reference to FIG. 22 will be described in detail.

Explanation of a process in which response signals of a plurality of electronic devices collide

Referring to FIG. 22, the first electronic device 200a transmits the response signals 1100, 1200, 1300, and 1400 corresponding to the wireless power signal within a predetermined response period (Tping interval). 100) (FIG. 22 (a)).

In this case, the wireless power transmitter 100 may decode

response signals

1100, 1200, 1300, and 1400 corresponding to the wireless power signal to transmit a packet to be transmitted by the first electronic device 200a. Can be obtained. Hereinafter, the case in which the wireless power transmitter 100 normally communicates with the first electronic devices 200a and RX1 to acquire a transmitted packet is referred to as normal communication.

However, during normal communication between the wireless power transmitter 100 and the first electronic devices 200a and RX1, at least one or more different electronic devices are newly received to receive power from the wireless power transmitter 100. It may be placed or entered into an active area or a sensing area of the wireless power transmitter 100. In FIG. 22B, at least one of the different electronic devices is the second electronic device 200b or RX2.

In this case, the second electronic devices 200b and RX2 may also transmit

different response signals

2100 and 2200 corresponding to the wireless power signal. As a result, the response signals 1300 and 1400 transmitted from the first electronic devices 200a and RX1 and the response signals 2100 and 2200 transmitted from the second electronic devices 200b and RX2 may collide with each other.

Therefore, the wireless power transmitter 100 cannot receive and decode the transmitted

response signals

1300, 1400, 2100, and 2200, and thus, transmits the transmitted

response signals

1300, 1400, 2100, and the like. The power control messages included in 2200 may not be obtained.

In FIG. 22B, the first electronic device 200a or RX1 communicates with the wireless power transmitter 100 through periodic transmission of

response signals

1100 and 1200 within a predetermined response interval (Tping interval). There is normal communication.

However, during the normal communication, the second electronic devices 200b and RX2 are newly placed or entered into the active area or the sensing area of the wireless power transmitter 100 and transmit the response signals 2100 and 2200. As a result, the response signals 1300 and 1400 of the first electronic devices 200a and RX1 and the response signals 2100 and 2200 of the second electronic devices 200b and RX2 collide with each other.

When the new second electronic devices 200b and RX2 enter as shown in FIG. 22B, the response signals 1300 and 1400 and the second electronic devices 200b of the first electronic devices 200a and RX1 are entered. Due to the collision of the response signals 2100 and 2200 of the RX2, the wireless power transmitter 100 cannot decode both the RX 1 response signal and the RX 2 response signal, and eventually, the wireless power transmitter. 100 may not obtain power control messages included in the transmitted

response signals

1300, 1400, 2100, and 2200.

The collision between the response signals 1300 and 1400 of the first electronic devices 200a and RX1 and the response signals 2100 and 2200 of the second electronic devices 200b and RX2 are caused by the wireless power transmitter 100 and the A selection phase 610, a detection phase 620, an identification and configuration phase 630, and a power transmission state that are operating states of the first electronic device 200a and RX1. (Power Transfer Phase) 640 may occur in any one state (see FIG. 14).

Therefore, a method of preventing a plurality of electronic devices from colliding with the response signals by entering the wireless power transmitter 100 may be required.

Hereinafter, a method of avoiding signal collision in unidirectional communication in wireless power transmission according to an embodiment disclosed herein will be described with reference to FIGS. 23 and 24.

Wireless Power Device and Signal Control Method for Avoiding Signal Collision in Wireless Power Transmission

Referring to FIG. 23, first, in order to avoid signal collision in unidirectional communication in wireless power transmission, the wireless power transmitter 100 may form a wireless power signal for power transmission (S110).

In addition, the wireless power transmitter 100 may receive a first response signal and a second response signal corresponding to the wireless power signal (S120). The first response signal and the second response signal may be received from the first device and the second device, respectively.

In addition, the wireless power transmitter 100 may determine whether the first response signal and the second response signal collide (S130).

In addition, the wireless power transmitter 100 may reset the power transmission when the first response signal and the second response signal collide based on the determination result (S140).

On the basis of the determination result, the wireless power transmitter 100 resets the power transmission when the first response signal and the second response signal collide, or the first response signal and the second response signal collide. If not, the control process of the wireless power transmitter 100 is terminated.

Next, the wireless power device for signal collision avoidance in unidirectional communication in wireless power transmission according to an embodiment of the present disclosure may include a power converter 111 and a power transmission controller 112. In addition, the wireless power device may further include various components to perform a function for signal collision avoidance in unidirectional communication in the wireless power transmission.

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

For example, the first time interval having a value generated by generating a random number may be 10 ms, and the second time interval may be 40 ms. Therefore, the first device and the second device after the reset of the power transmission to prevent the first response signal and the second response signal from colliding the first response signal and the first by 10ms and 40ms, respectively 2, the response signal may be delayed and transmitted to the wireless power transmitter 100.

In addition, when a plurality of electronic devices are newly placed or entered into an active area or a sensing area of the wireless power transmitter 100 to receive power from the wireless power transmitter 100, the predetermined response The period (Tping interval) may be set to a time that can include all the response signals of the plurality of electronic devices corresponding to the wireless power signal. In this way, the response signals are transmitted to the wireless power transmitter 100 at a time interval from each other, so that the collision probability of the response signals may be reduced.

For example, a temporal length occupied by the first response signal and the second response signal in the time domain (when the response signals include a packet including a power control message) is 100 ms. In this case, the predetermined response interval (Tping interval) may be at least 200ms.

According to one embodiment, the predetermined response interval (Tping interval) may be set in consideration of the number of a plurality of electronic devices that can enter the initial setting.

According to another embodiment, however, in the initial setting, the predetermined response period (Tping interval) may be set to the first response period (Tping interval_1) including only the response period corresponding to one electronic device, a plurality of different When a new electronic device is newly placed or entered into an active area or a sensing area of the wireless power transmitter 100, the predetermined response interval (Tping interval) is a response signal of the plurality of different electronic devices. It may be newly set to a second response period (Tping interval_2) that includes all of these.

For example, when the temporal length of the first response signal and the second response signal is 100 ms, the predetermined response period (Tping interval) may be set to 200 ms as an initial setting. However, the predetermined response period is initially set to 100 ms, which is a first response period (Tping interval_1), and a plurality of different electronic devices are newly placed in the active area or the detection area of the wireless power transmitter 100. ) Or when entering, the predetermined response period (Tping interval) may be changed to 200 ms, which is the second response period (Tping interval_2), and set to be greater than or equal to the time period to include both the first response signal and the second response signal. have.

The second response period (Tping interval_2) may be set to be longer than a time period to include both the first response signal and the second response signal, and the first response period (Tping interval_1) and the second response period ( Tping interval_2) may be initially set to the same time, but when the second device is newly placed or entered into an active area or a sensing area of the wireless power transmitter 100, a response period (1) may be set. Tping interval_1) may be changed to a second response period (Tping interval_2).

According to an embodiment, the first response signal and the second response signal may be the wireless power signal whose amplitude is modulated by the first device and the second device, respectively, and determining whether or not the collision occurs is wireless. The power transmitter 100 may determine whether the first device and the second device can be detected based on the first response signal and the second response signal, respectively.

The detection of the first device and the second device by the wireless power transmitter 100 is performed in the analog detection process (analog ping), which is the selected state 610 among the operating states of the wireless power transmitter 100. Detection may mean detection in a digital ping, which is the detection state 620. However, in a broad sense, the detection of the first device and the second device by the wireless power transmitter 100 may result in the identification and configuration phase 630 and the power transfer phase. Detection at 640).

The identification information is at least one of information indicating a version of a protocol for wireless power transmission as described above, information identifying a manufacturer of the electronic device 200, information indicating the presence or absence of an expansion device identifier, and a basic device identifier. It may include.

Resetting of the power transmission means various operations for the wireless power transmitter 100 to avoid collision of the response signals, and enters the wireless power transmitter 100 through the resetting of the power transmission. It can be aimed to inform the electronic devices of that the response signal has collided.

According to an embodiment, the resetting of the power transmission may be to stop formation of a wireless power signal for the power transmission. For example, stopping the formation of the wireless power signal may mean cutting off power supplied to the plurality of electronic devices. Through the interruption of the power supply, the plurality of electronic devices may know that the response signals have collided, and the plurality of electronic devices may change their settings so that the response signals do not collide with the reset operation. It becomes possible. Their setting related to this may be a delay time used when transmitting the response signals. For example, the changed delay time may be the first time interval or the second time interval.

According to one modified embodiment, the resetting of the power transmission is to transmit a signal including information indicating that the first response signal and the second response signal has collided to the first device and the second device, respectively. Can be.

The wireless power transmitter 100 may transmit a signal including information indicating that the first response signal and the second response signal have collided with the wireless Internet module 213 or the short-range communication module of the electronic device 200. The data may be transmitted through data communication with the electronic device 200 established through 214. In this case, the wireless power transmitter 100 induces a reset operation of the plurality of electronic devices to avoid collision of the response signals by transmitting information indicating that the first response signal and the second response signal have collided. can do.

Electronic device for avoiding signal collision in wireless power transmission and control method thereof

Referring to FIG. 24, in order to avoid signal collision in unidirectional communication in wireless power transmission, the electronic device 200 may receive a wireless power signal for power transmission from the wireless power transmitter 100 (S210). ).

In addition, the electronic device 200 may transmit a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period (S220).

It may be determined whether the power transmission of the wireless power transmitter is reset (S230), and when the power transmission is reset based on the determination result, the time interval may be set as a second time (S240).

Next, the electronic device 200 may transmit a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period (S250).

When the electronic device 200 transmits a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period, or when the power transmission is not reset, the electronic device ( The control process of 200 is terminated.

Next, the electronic device 200 for signal collision avoidance in unidirectional communication in wireless power transmission according to an embodiment of the present disclosure may include a power converter 291 and a power reception controller 292. . In addition, the electronic device 200 may further include various components to perform a function for avoiding signal collision in unidirectional communication in the wireless power transmission.

The power receiver 291 may receive a wireless power signal for power transmission from the wireless power transmitter.

The power reception controller 292 may control the power receiver to transmit a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period (Tping interval_1).

In addition, the power receiving control unit 292 determines whether the power transmission of the wireless power transmitter 100 has been reset, and, based on the determination result, sets the time interval as a second time when the power transmission is reset. Can be.

In addition, the power receiving control unit 292 is such that the power receiving unit 291 transmits a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period (Tping interval_2). The second time may be determined based on a value generated by generating a random number. In addition, the second response period (Tping interval_2) may be determined to be longer than the time that can include both the fourth response signal and the fifth response signal transmitted from the plurality of other electronic devices.

As described above, the second response period (Tping interval_2) may be set in consideration of the number of the plurality of electronic devices that can enter the initial setting, but the initial setting includes only the response period corresponding to one electronic device When a plurality of different electronic devices that are set to the same value as the first response period (Tping interval_1) and are newly placed or entered in the active area or the sensing area of the wireless power transmitter 100, The second response period (Tping interval_2) including all the response signals of the plurality of other electronic devices may be newly set.

According to an embodiment, the determination of whether the power transmission is reset may be determined based on whether the wireless power signal is received.

As described above, resetting of the power transmission may be to stop formation of a wireless power signal for the power transmission. Therefore, when the formation of the wireless power signal is stopped, the electronic device 200 may no longer receive the wireless power signal.

Also, for example, stopping the formation of the wireless power signal may mean to cut off power supplied to the plurality of electronic devices. Through the interruption of the power supply, the plurality of electronic devices may know that the response signals have collided, and the plurality of electronic devices may change their settings so that the response signals do not collide with the reset operation. It becomes possible.

According to an embodiment of the present disclosure, the determining whether the power transmission is reset may include a signal including information indicating that the third response signal is not decoded from the wireless power transmitter 100 using a predetermined format. It may be determined based on whether it is received.

Reception of a signal including information indicating that the third response signal is not decoded using a predetermined format is established through the wireless internet module 213 or the short range communication module 214 of the electronic device 200. It may be made through data communication with the wireless power transmitter 100.

According to another modified embodiment, the third response signal includes a preamble, a header and a message, and the information indicating that the third response signal is not decoded using a predetermined format includes the preamble, header and At least one of the messages may be information indicating that the third response signal cannot be restored because an error due to a collision occurs.

According to an embodiment of the present disclosure, the third response signal includes identification information corresponding to the electronic device 200, and the information indicating that the response signal is not decoded using a predetermined format is wireless. It may be information that the power transmitter 100 cannot obtain identification information corresponding to the electronic device based on the reception of the third response signal.

Description of the first embodiment

In FIG. 25, TX is a wireless power transmitter 100, and RX1 and RX2 are first electronic devices 200a and RX which are electronic devices 100 and RX that receive power from the wireless power transmitter 100, respectively. 2 electronic device 200b.

Referring to FIG. 25, in a first interval 410, the first electronic devices 200a and RX1 may periodically transmit the

first response signals

1100 and 1200 at a first response period Tping interval_1. In this case, the wireless power transmitter 100 (TX) decodes the

first response signals

1100 and 1200, and thereby obtains a power control message included in the

first response signals

1100 and 1200. Normal communication with the first electronic devices 200a and RX1 is possible.

In the second section 420, the second electronic devices 200b and RX2 may be newly placed or entered into an active area or a sensing area of the wireless power transmitter 100, TX. In this case, the second electronic devices 200a and RX2 may transmit second response signals 2100 and 2200, and thus the

first response signals

1100 and 1200 and the second response signals 2100 and 2200. ) May collide.

In order to avoid collision between the

first response signals

1100 and 1200 and the second response signals 2100 and 2200, the wireless power transmitters 100 and TX may reset power transmission.

As described above, the resetting of the power transmission may be performed by the wireless power transmitter 100 (TX) blocking the transmission of the wireless power signal. The blocking of the wireless power signal transmission may be to cut off power supply to the first electronic device 200a and RX1 and the second electronic device 200b and RX2.

Since the power supply to the first electronic device 200a and RX1 and the second electronic device 200b and RX2 is cut off, the first electronic device 200a and RX1 and the second electronic device 200b and RX2 are A reset operation may be performed, and a first interval T1, which is a time interval for delaying and transmitting a first response signal and a second interval for delaying and transmitting a second response signal, may be reset. Two times T2 may be reset. For example, the first time T1 may be reset from 0ms to 10ms, and the second time T2 may be reset from 0ms to 40ms.

In a third section 430, after resetting the power transmission, the first electronic device 200a or RX1 performs a first response signal (i) after the first time T1 at a second response period Tping interval_2. 1500, 1600 may be transmitted periodically. In addition, the second electronic devices 200b and RX2 may periodically transmit the second response signals 2300 and 2400 after the second time T2 in the second response period Tping interval_2. By doing so, the

first response signals

1500 and 1600 and the second response signals 2300 and 2400 which are formed so as not to collide with each other may be sequentially transmitted.

As described above, the second response period (Tping interval_2) may be set to be longer than the time to include both the first response signal (1500, 1600) and the second response signal (2300, 2400), The first response period (Tping interval_1) and the second response period (Tping interval_2) may be initially set to the same time, but the second electronic devices 200b and RX2 newly perform the activity of the wireless power transmitter 100. In the case of being placed or entering the area or the sensing area, the response period may be changed from the first response period Tping interval_1 to the second response period Tping interval_2.

In FIG. 25, the Ttimeout is an operation of the wireless power transmitter 100 (TX) when the

first response signals

1300 and 1400 and the second response signals 2100 and 2200 are interrupted and the power supply is cut off. It may mean a time until the state transitions from the power transmission state to the standby state. The reset operation of the first device RX1 and the second device RX2 may be started from the Ttimeout.

Description of the second embodiment

Hereinafter, a method of avoiding signal collision in unidirectional communication in wireless power transmission according to a second embodiment disclosed herein is disclosed.

According to the second embodiment, the wireless power transmitter 100 (TX) may normally communicate with a plurality of electronic devices RX1 to RXn-1. In this case, RXn, a new electronic device, may be newly placed or entered into an active area or a sensing area of the wireless power transmitter 100 during the normal communication. Therefore, the response signals of the plurality of electronic devices RX1 to RXn-1 may collide with the response signals of the RXn. In this case, the wireless power transmitter 100 may reset power transmission.

Further, according to the second embodiment, the wireless power transmitter 100 may receive the response signals of the plurality of electronic devices RX1 to RXn-1 and the response signals of the RXn again after the power transmission is reset. Can be. When the response signals collide with each other as a result of receiving the response signals of the plurality of electronic devices RX1 to RXn-1 and the response signals of the RXn again, the wireless power transmitter 100 resets power transmission again. can do

Referring to FIG. 26, first, the wireless power transmitter 100 (TX) may normally communicate with a plurality of electronic devices RX1 to RXn-1 (S410).

During the normal communication, RXn, a new electronic device, may be placed or entered into an active area or a sensing area of the wireless power transmitter 100. In this case, the wireless power transmitter 100 (TX) New communication with RXn may be attempted (S420).

Next, the wireless power transmitter 100 (TX) may determine whether the response signals of the plurality of electronic devices RX1 to RXn-1 and the response signals of the RXn collide with each other (S430).

According to an embodiment, the determination of whether a collision occurs may be performed according to whether response signals of the plurality of electronic devices RX1 to RXn-1 and response signals of the RXn are decoded using a predetermined format. have.

The predetermined format may include a preamble, a header, and a message. The determination of whether the response signals of the plurality of electronic devices RX1 to RXn-1 collide with the response signals of the RXn includes the preamble, At least one of a header and a message may be determined based on whether an error due to a collision occurs, so that the response signals of the plurality of electronic devices RX1 to RXn-1 and the response signals of the RXn cannot be restored. .

Next, when the response signals of the plurality of electronic devices RX1 to RXn-1 collide with the response signals of the RXn based on the determination result, the wireless power transmitter 100 (TX) transmits power. You can reset it. When the response signals of the RX1 to RXn do not collide, the wireless power transmitter 100 (TX) may perform normal communication with the RX1 to RXn (S470).

As described above, the resetting of the power transmission may be performed by the transmission of the wireless power signal blocked by the wireless power transmitter 100 (TX), and the transmission of the wireless power signal is interrupted to the RX1 to RXn. It may mean that the power supplied is cut off.

The resetting of the power transmission may induce a reset of the RX1 to RXn. That is, the RX1 to RXn may detect whether the response signals of the plurality of electronic devices RX1 to RXn-1 collide with the response signals of the RXn by detecting the resetting of the power transmission. It is possible to reset their settings based on (S440).

Next, the RX1 to RXn may change a delay time corresponding to the response signal of the RX1 to RXn using a collision avoidance algorithm, and may change a communication address corresponding to the delay time (S450).

The collision avoidance algorithm may mean a method in which delay times corresponding to response signals of RX1 to RXn are determined based on a value generated by generating a random number after resetting the power transmission. For example, the RX1 to RXn may generate random numbers to change the delay times corresponding to the response signals of the RX1 to RXn to the times from T1 to Tn, respectively.

The communication address may be a means for storing delay times corresponding to response signals of the RX1 to RXn. In addition, the communication address may serve as an address for normal communication between the RX1 to RXn and the wireless power transmitter 100 (TX).

Thereafter, the RX1 to RXn may transmit response signals of the RX1 to RXn to the wireless power transmitter 100 (TX) after the changed time interval of the T1 to Tn.

In this case, the wireless power transmitter 100 (TX) may again determine whether the response signals of the RX1 to RXn collide with each other (S460).

Based on the determination result, when the response signals of the RX1 to RXn collide with each other, the process may return to the reset step S440 of the RX1 to RXn.

When the response signals of the RX1 to RXn do not collide, the wireless power transmitter 100 (TX) may perform normal communication with the RX1 to RXn (S470).

The method described above may be implemented in a recording medium readable by a computer or a 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 transmitter 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. have.

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 functions and operations described herein. Software code may be implemented in software applications 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 ( 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 can be modified, changed, or improved in various forms within the scope of the spirit and claims of the present invention.

Claims

A power converter configured to form a wireless power signal for power transmission and to receive a first response signal and a second response signal corresponding to the wireless power signal; And

And a power transmission controller configured to determine whether the first response signal and the second response signal collide with each other, and to reset the power transmission when the first response signal and the second response signal collide with each other based on the determination result. But

And the first response signal and the second response signal are generated by modulating the wireless power signal by a first device and a second device, respectively.
The method of claim 1, wherein the power transmission control unit,

As a result of the reset of the power transmission, the wireless power transmitter for controlling to receive the first response signal and the second response signal formed so as not to collide with each other sequentially.
The method of claim 2, wherein receiving sequentially

And receiving the first response signal after a first time interval within a predetermined response period, and receiving the second response signal after a second time interval.
The method of claim 3, wherein the first time interval and the second time interval,

Wireless power transmitter that is determined based on the value generated by generating a random number.
The method of claim 3, wherein the predetermined response period,

The wireless power transmitter is determined to be longer than the time that can include both the first response signal and the second response signal, and after resetting the power transmission.
The method of claim 1, wherein the determination of whether the collision occurs,

And the first response signal and the second response signal are decoded using a predetermined format.
The method of claim 6,

The predetermined format includes a preamble, a header and a message,

The determination of whether or not the first response signal and the second response signal is collision,

And determining whether the first response signal and the second response signal cannot be recovered because an error due to a collision occurs in at least one of the preamble, the header, and the message.
The method of claim 1,

The power converter periodically receives a response signal of the first device that does not collide with a response signal of the second device within a first response period,

The power transmission control unit,

Decoding the first response signal and the second response signal using a predetermined format,

And determining whether a collision between the first response signal and the second response signal occurs based on whether the decoding is performed.
The method of claim 8,

The first response signal and the second response signal are periodically received within a second response period,

The second response period is determined to be longer than the time that can include both the first response signal and the second response signal, and is determined after resetting the power transmission.
The method of claim 1,

The first response signal and the second response signal are the wireless power signal whose amplitude is modulated by the first device and the second device, respectively,

The determination of whether the collision occurs,

And determining whether the first device and the second device can be detected based on the first response signal and the second response signal, respectively.
The method of claim 1,

The first response signal and the second response signal each include identification information corresponding to the first device and the second device,

The determination of whether the collision occurs,

And determining whether identification information of the detected second device is obtained through reception of the first response signal and the second response signal.
The method of claim 1, wherein the resetting of the power transmission,

Wireless power transmitter for stopping the formation of the wireless power signal for the power transmission.
The method of claim 1, wherein the resetting of the power transmission,

And transmitting a signal including information indicating that the first response signal and the second response signal have collided to the first device and the second device, respectively.
A power receiver for receiving a wireless power signal for power transmission from the wireless power transmitter;

And control the power receiver to transmit a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period,

It is determined whether the power transmission of the wireless power transmitter is reset,

Based on the determination result, when the power transmission is reset, set the time interval to a second time,

And a power reception controller configured to control the power receiver to transmit a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period.
The method of claim 14, wherein the second time,

The electronic device is determined based on a value generated by generating a random number.
The method of claim 14, wherein the second response period,

And the fourth response signal and the fifth response signal transmitted from the plurality of other electronic devices are determined to be greater than or equal to time.
The method of claim 14, wherein determining whether the power transmission has been reset,

The electronic device determines whether the wireless power signal is received.
The method of claim 14, wherein determining whether the power transmission has been reset,

And determining based on whether a signal including information indicating that the third response signal is not decoded using a predetermined format is received from the wireless power transmitter.
The method of claim 18,

The third response signal includes a preamble, a header, and a message;

The information indicating that the third response signal is not decoded using a predetermined format is

At least one of the preamble, the header, and the message is information indicating that an error due to a collision has occurred and the third response signal cannot be restored.
The method of claim 18, wherein the third response signal includes identification information corresponding to the electronic device.

The information indicating that the response signal is not decoded using a predetermined format is

Wherein the wireless power transmitter is unable to obtain identification information corresponding to the electronic device based on the reception of the third response signal.
Forming a wireless power signal for power transmission;

Receiving a first response signal and a second response signal corresponding to the wireless power signal, wherein the first response signal and the second response signal are modulated by the first device and the second device, respectively; Is generated;

Determining whether the first response signal and the second response signal collide; And

And resetting the power transmission when the first response signal and the second response signal collide with each other based on the determination result.
The method of claim 21,

And sequentially receiving the first response signal and the second response signal which are formed so as not to collide with each other as a result of the resetting of the power transmission.
The method of claim 22, wherein the receiving sequentially

And receiving the first response signal after a first time interval within a predetermined response period, and receiving the second response signal after a second time interval.
The method of claim 23, wherein the first time interval and the second time interval,

Control method of a wireless power transmitter that is determined based on the value generated by generating a random number.
The method of claim 23, wherein the predetermined response period,

The control method of the wireless power transmitter is determined to be longer than the time that can include both the first response signal and the second response signal, and after resetting the power transmission.
The method of claim 21, wherein the determination of whether or not the collision occurs,

And the first response signal and the second response signal are decoded using a predetermined format.
The method of claim 26,

The predetermined format includes a preamble, a header and a message,

The determination of whether or not the first response signal and the second response signal is collision,

And determining whether the first response signal and the second response signal cannot be recovered because an error due to a collision occurs in at least one of the preamble, the header, and the message.
The method of claim 21,

Periodically receiving a response signal of the first device that does not collide with the response signal of the second device within a first response period,

Determining whether or not the collision occurs,

Decoding the first response signal and the second response signal using a predetermined format; And

And determining whether a collision between the first response signal and the second response signal occurs based on whether or not the decoding is performed.
The method of claim 28,

The first response signal and the second response signal are periodically received within a second response period,

The second response period is determined to be longer than the time that can include both the first response signal and the second response signal, and is determined after resetting the power transmission.
The method of claim 21,

The first response signal and the second response signal are the wireless power signal whose amplitude is modulated by the first device and the second device, respectively,

The determination of whether the collision occurs,

And determining based on whether the first device and the second device can be detected based on the first response signal and the second response signal, respectively.
The method of claim 21,

The first response signal and the second response signal each include identification information corresponding to the first device and the second device,

The determination of whether the collision occurs,

And determining whether identification information of the detected second device is obtained through reception of the first response signal and the second response signal.
The method of claim 21, wherein the resetting of the power transmission,

The control method of the wireless power transmitter to stop the formation of the wireless power signal for the power transmission.
The method of claim 21, wherein the resetting of the power transmission,

Returning to the step of forming a wireless power signal for the power transmission control method of a wireless power transmitter.
The method of claim 21, wherein the resetting of the power transmission,

And transmitting a signal including information indicating that the first response signal and the second response signal have collided to the first device and the second device, respectively.
Receiving a wireless power signal for power transmission from a wireless power transmitter;

Transmitting a third response signal corresponding to the wireless power signal after a time interval set to a first time within a first response period;

Determining whether power transmission of the wireless power transmitter is reset;

Setting the time interval to a second time when the power transmission is reset based on the determination result;

And transmitting a fourth response signal corresponding to the wireless power signal after a time interval set to the second time within a second response period.
The method of claim 35, wherein the second time is,

The control method of the electronic device which is determined based on the value generated by generating a random number.
The method of claim 35, wherein the second response period,

And controlling the electronic device to determine whether the fourth response signal and the fifth response signal transmitted from the plurality of other electronic devices are included for a time or more.
36. The method of claim 35, wherein determining whether the power transfer has been reset,

And determining based on whether the wireless power signal is received.
36. The method of claim 35, wherein determining whether the power transfer has been reset,

And determining based on whether a signal including information indicating that the third response signal is not decoded using a predetermined format is received from the wireless power transmitter.
The method of claim 39,

The third response signal includes a preamble, a header, and a message;

The information indicating that the third response signal is not decoded using a predetermined format is

And at least one of the preamble, the header, and the message is information indicating that an error due to a collision has occurred and the third response signal cannot be restored.
The method of claim 39, wherein the third response signal includes identification information corresponding to the electronic device.

The information indicating that the third response signal is not decoded using a predetermined format is

And the information indicating that the wireless power transmitter cannot obtain identification information corresponding to the electronic device based on the reception of the third response signal.