KR20180017415A - Method and apparatus for transmitting wireless power in wireless charging system - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting wireless power for preventing a cross connection in a wireless charging system in advance. According to an embodiment of the present invention, the wireless power transmitting method in a wireless power transmitter comprises the steps of: sensing an object disposed in a charging area; generating a first pattern code corresponding to the wireless power transmitter when the object is sensed; transmitting a first signal including the first pattern code; and receiving a second signal including a second pattern code and determining a wireless power receiver to which communication is to be connected by checking whether the first pattern code and the second pattern code are the same or not. Therefore, the method and the apparatus have an advantage of minimizing an electric power loss due to the cross connection and damage of the apparatus due to heat generation in the wireless charging system.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission system and a wireless power transmission method in a wireless charging system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technique, and more particularly, to a wireless power transmission method capable of avoiding a cross connection in a wireless charging system and devices therefor.

Background Art [0002] With the rapid development of information communication technology in recent years, a ubiquitous society based on information communication technology is being made.

In order for information communication devices to be connected anytime and anywhere, sensors equipped with a computer chip having a communication function must be installed in all facilities of the society. Therefore, power supply problems of these devices and sensors are becoming a new challenge. In addition, mobile devices such as Bluetooth handsets and iPods, as well as mobile phones, have been rapidly increasing in number, and charging the battery has required users time and effort. As a way to solve this problem, wireless power transmission technology has recently attracted attention.

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer And thereafter, a method of radiating electromagnetic waves such as radio waves, lasers, high frequencies, and microwaves to transfer electrical energy has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

Up to the present, energy transmission using radio may be roughly classified into a magnetic induction method, an electromagnetic resonance method, and an RF transmission method using a short wavelength radio frequency.

Although the electric power transmission method using electromagnetic induction is mainly used up to now, the electric power transmission method by electromagnetic induction has to maintain accurate alignment between the transmission coil, which is the primary coil, and the reception coil, which is the secondary coil, The distance between the transmitting and receiving coils is short.

On the other hand, the wireless power transmission method using the electromagnetic resonance method uses a method of resonating electromagnetic waves containing electrical energy instead of resonating the sound. In order for the resonance phenomenon to be induced, the wireless power transmission apparatus and the wireless power reception apparatus must operate with the same resonance frequency.

The electromagnetic resonance method is characterized in that the restriction on the alignment problem between the wireless power transmitting and receiving coils is small and the distance between the transmitting and receiving coils capable of wireless charging is longer than that of the electromagnetic induction method.

The wireless power transmitter and the wireless power receiver can communicate with each other based on a predetermined scheme, for example, a Zig-bee scheme or a bluetooth low energy (BLE) scheme. An out-band scheme such as a Zig-bee scheme or a Bluetooth low energy scheme is an in-band communication scheme in which communication is performed using the same frequency band as that used for wireless power transmission The communication distance is long.

Hereinafter, the generation of the cross-connection in the wireless power charging system and the problems thereof will be briefly described.

A first wireless power transmitter TX1 and a second wireless power transmitter TX2 that support the electromagnetic resonance method can be disposed close to each other. In addition, a first wireless power receiver RX1 may be disposed on the first wireless power transmitter TX1, and a second wireless power receiver RX2 may be disposed on the second wireless power transmitter TX2. In order to maximize the charging efficiency, the first wireless power transmitter TX1 has to transmit power to the first wireless power receiver RX1 arranged in the neighborhood, and the second wireless power transmitter TX2 has to transmit power to the second wireless power transmitter RX2, The power must be transmitted to the power receiver RX2. In this case, the first wireless power transmitter TX1 communicates with the first wireless power receiver RX1, and the second wireless power transmitter TX2 communicates with the second wireless power receiver RX2.

In the case of a wireless charging system supporting some electromagnetic resonance methods, the communication distance and the chargeable distance are advantageous over the electromagnetic induction method using the in-band communication method due to the use of the out-of-band communication. However, due to the increased communication distance, the first wireless power transmitter TX1 and the second wireless power receiver RX2 are communicatively coupled, and the second wireless power transmitter TX2 and the first wireless power receiver RX1 communicate There is a problem that can be connected. For convenience of explanation, it will be referred to as a cross-connection.

When a cross-connection is made, not only is wireless charging efficiency lower than a normal communication connection, but also undesired power may be received by the wireless power receiver, resulting in device damage.

It is an object of the present invention to provide a wireless power transmission method in a wireless charging system and an apparatus therefor.

It is another object of the present invention to provide a wireless power transmission method and apparatus capable of preventing cross-connection in advance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The present invention can provide a wireless power transmission method and apparatus therefor that are capable of preventing cross-connection in a wireless charging system in advance.

A wireless power transmission method in a wireless power transmitter according to an embodiment of the present invention includes the steps of sensing an object placed in a charging area and generating a first pattern code corresponding to the wireless power transmitter when the object is sensed And transmitting the first signal including the first pattern code and the second signal including the second pattern code, comparing the one pattern code and the second pattern code to connect the communication And establishing a wireless power receiver.

Here, the wireless power transmitter may be a wireless power transmitter that supplies power to only one wireless power receiver at a time.

The first pattern code may be generated using at least one of device identification information, power class information, hardware version information, firmware version information, and standard protocol version information corresponding to the wireless power transmitter.

Here, the device identification information may include at least one of unique serial number information, manufacturer code information, and product code information.

The first signal may be a power signal transmitted through a transmission resonator.

In one example, the first signal may be a long beacon signal transmitted to identify the sensed object in a power saving state.

Also, the second signal may be received via short-range wireless communication.

For example, the second signal may be an advertisement signal received via Bluetooth communication in a low power state.

Also, the first pattern code may be encoded using a predetermined coding technique, and then modulated and transmitted.

Further, a wireless power receiver corresponding to the second signal, in which the first pattern code and the second pattern code coincide, may be established with a wireless power receiver to which the communication is to be connected.

In addition, if the first pattern code and the second pattern code do not match, the step of transmitting the first signal or the step of sensing the object may be performed.

A method of wireless power transmission in a wireless power transmitter according to another embodiment of the present invention includes the steps of sensing an object disposed in a charging area and, when the object is sensed, transmitting a first signal for identifying the sensed object to a first Frequency band, receiving a second signal corresponding to the first signal over a second frequency band, measuring a signal strength of the received second signal, and measuring a signal strength based on the measured signal strength And establishing a wireless power receiver to connect the communication.

Also, the first signal may be a long beacon signal transmitted to identify the sensed object in a power saving state, and the second signal may be an advertisement signal received through Bluetooth communication in a low power state.

The step of measuring the signal strength of the received second signal

Determining whether the second signals received within a predetermined period of time after the first signal transmission are multiple and measuring a Received Signal Strength Indicator (RSSI) corresponding to each of the second signals if the number is plural And a wireless power receiver corresponding to the second signal with the highest RSSI may be established with the wireless power receiver to which the communication will be connected.

Also, the wireless power transmitter may be a wireless power transmitter that supplies power to only one wireless power receiver at a time.

According to another aspect of the present invention, there is provided a wireless power transmission apparatus including a sensing unit for sensing an object disposed in a charging region, and a pattern code generating unit for generating a first pattern code corresponding to the wireless power transmitter when the object is sensed A communication unit for receiving a first signal including a first pattern code and a second signal including a second pattern code and a power transmitting unit for transmitting a first signal including the first pattern code, And a control unit for establishing a wireless power receiver for connecting the communication based on the comparison result.

In addition, the controller can control to supply power to only one wireless power receiver at a time.

The first pattern code may be generated using at least one of device identification information, power class information, hardware version information, firmware version information, and standard protocol version information corresponding to the wireless power transmitter.

Here, the device identification information may include at least one of unique serial number information, manufacturer code information, and product code information.

Also, the first signal may be a long beacon signal transmitted to identify the sensed object in a power saving state.

Also, the second signal may be an advertisement signal received through Bluetooth communication in a low power state.

In addition, the power transmitter may generate the long beacon signal by encoding the first pattern code using a predetermined coding technique and modulating the first pattern code using a predetermined modulation scheme.

In addition, the control unit may determine a wireless power receiver corresponding to the second signal in which the first pattern code and the second pattern code coincide with the wireless power receiver to which the communication is to be connected.

According to another aspect of the present invention, there is provided a wireless power transmission apparatus including a sensing unit for sensing an object disposed in a charging region, and a controller for sensing a first signal for identifying the sensed object, A communication unit for receiving a second signal corresponding to the first signal and a power transmitting unit for transmitting the second signal through a second frequency band, a measuring unit for measuring a signal intensity of the received second signal, And determining a wireless power receiver to which the communication is to be connected.

Here, the first signal may be a long beacon signal transmitted to identify the sensed object in a power saving state, and the second signal may be an advertisement signal received through Bluetooth communication in a low power state.

If the measurement unit measures a received signal strength indicator (RSSI) corresponding to each of the second signals when the second signals received within a predetermined time after the first signal transmission are plural, A wireless power receiver corresponding to the second largest signal can be established with the wireless power receiver to connect the communication.

In addition, the controller can control to supply power to only one wireless power receiver at a time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

Effects of the method, apparatus and system according to the present invention will be described as follows.

An advantage of the present invention is that it provides a method and apparatus for avoiding cross-connection in a wireless charging system supporting an electromagnetic resonance method.

In addition, the present invention is advantageous in that it can provide a single type wireless power transmission apparatus that supports an electromagnetic resonance method capable of minimizing power consumption and device damage due to crossing.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a block diagram illustrating a structure of a wireless power transmission system according to an embodiment of the present invention.
2 is a view for explaining types and characteristics of a wireless power transmitter according to an embodiment of the present invention.
3 is a view for explaining types and characteristics of a wireless power receiver according to an embodiment of the present invention.
4 is an equivalent circuit diagram of a wireless power transmission system according to an embodiment of the present invention.
5 is a state transition diagram for explaining a state transition procedure in a wireless power transmitter according to an embodiment of the present invention.
6 is a state transition diagram of a wireless power receiver according to an embodiment of the present invention.
7 is a view for explaining an operation region of a wireless power receiver according to V _RECT according to an embodiment of the present invention.
8 is a flowchart illustrating a wireless charging procedure according to an embodiment of the present invention.
9 is a configuration diagram of a wireless power transmission system according to an embodiment of the present invention.
10 is a diagram for explaining a cross-connection problem on a wireless power transmission system including a single type wireless power transmitter according to the present invention.
11 is a diagram for explaining a wireless power transmission procedure in a wireless power transmitter according to an embodiment of the present invention.
12 is a flowchart illustrating a method of avoiding a cross connection in a wireless power transmission apparatus according to an embodiment of the present invention.
13 is a flowchart illustrating a method of avoiding a cross connection in a wireless power receiving apparatus according to an embodiment of the present invention.
FIG. 14 is a flowchart for explaining a cross-connection avoiding method in a wireless power transmission apparatus according to another embodiment of the present invention.
15 is a block diagram illustrating a structure of a wireless power transmission apparatus according to an embodiment of the present invention.
16 is a block diagram illustrating a structure of a wireless power receiving apparatus according to an embodiment of the present invention.
17 is a block diagram illustrating a structure of a wireless power transmission apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the following description of the embodiments, an apparatus for transmitting wireless power on a wireless charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, , A wireless power transmission device, a wireless power transmitter, and the like.

In addition, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver, and the like are mixed in the expression for a device that receives power wirelessly from a wireless power transmitting device Can be used.

The wireless power transmitter according to the present invention can be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling fill type, a wall type, The wireless power transmitter may transmit power to a plurality of wireless power receiving devices at the same time or may transmit power to only one wireless power receiving device.

To this end, the wireless power transmitter may comprise at least one wireless power transmission means.

The wireless power transmitter according to the present invention may also be networked with another wireless power transmitter. As an example, the wireless power transmitter may be interworked using short range wireless communications such as Bluetooth. In another example, the wireless power transmitter may be interworked using wireless communication technologies such as Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE) / LTE-Advanced, Wi-Fi, , And may be linked to each other through a wired Internet network.

The wireless power transmission means applied to the present invention is a device in which a variety of electromotive force transmission standards based on an electromagnetic induction system in which a magnetic field is generated in a transmitting-end coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving- Or parts. Here, the electromagnetic induction type wireless power transmission standard may include, but is not limited to, an electromagnetic induction wireless charging technique defined by a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA).

In another example, the wireless power transmission means may be a device or component to which an electromagnetic resonance scheme is applied that transmits power to a wireless power receiver located near by tuning the magnetic field generated by the transmission coil of the wireless power transmitter to a specific resonance frequency Lt; / RTI > For example, the electromagnetic resonance method may include, but is not limited to, a resonance-type wireless charging technique defined in Alliance for Wireless Power (A4WP), a wireless charging technology standard organization.

As another example, the wireless power transmission means may be a device or a part to which an RF wireless power transmission scheme is applied in which low-power energy is transmitted to an RF signal to transmit power to a wireless power receiver located at a remote location.

According to another embodiment of the present invention, the wireless power transmitter according to the present invention may be designed to support at least two or more wireless power transmission schemes among the electromagnetic induction, electromagnetic resonance, and RF wireless power transmission schemes.

In this case, the wireless power transmitter may adaptively determine the wireless power transmission scheme based on the type, state, required power, etc. of the wireless power receiver as well as the capabilities mounted on the wireless power transmitter and the wireless power receiver.

In addition, the wireless power receiver according to an embodiment of the present invention may include at least one wireless power receiving means, and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power receiving means may be an apparatus or part that supports at least one of the electromagnetic induction method, the electromagnetic resonance method, and the RF wireless power transmission method.

The wireless power receiver according to the present invention can be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) Such as an electric toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, and the like. However, the present invention is not limited thereto. If it is possible, it is enough. The wireless power receiver according to another embodiment of the present invention may be installed in a home appliance including a TV, a refrigerator, and a washing machine, a vehicle, an unmanned airplane, an air drone, and a robot.

1 is a block diagram illustrating a structure of a wireless power transmission system according to an embodiment of the present invention.

Referring to FIG. 1, a wireless power transmission system may include a wireless power transmitter 100 and a wireless power receiver 200.

Although the wireless power transmitter 100 is shown in FIG. 1 as transmitting wireless power to one wireless power receiver 200, this is merely one embodiment, and wireless power according to another embodiment of the present invention Transmitter 100 may transmit wireless power to a plurality of wireless power receivers 200. [ It should be noted that the wireless training receiver 200 according to yet another embodiment may simultaneously receive wireless power from a plurality of wireless power transmitters 100.

The wireless power transmitter 100 may generate a magnetic field using a specific power transmission frequency to transmit power to the wireless power receiver 200. [

The wireless power receiver 200 may receive power by tuning to the same frequency as that used by the wireless power transmitter 100. [

As an example, the frequency for power transmission may be, but is not limited to, the 6.78 MHz band.

That is, the power transmitted by the wireless power transmitter 100 may be communicated to the wireless power receiver 200 that is in resonance with the wireless power transmitter 100.

The maximum number of wireless power receivers 200 capable of receiving power from one wireless power transmitter 100 is determined by the maximum transmission power level of the wireless power transmitter 100, the maximum power reception level of the wireless power receiver 200, May be determined based on the physical structure of the power transmitter 100 and the wireless power receiver 200.

The wireless power transmitter 100 and the wireless power receiver 200 can perform bidirectional communication in a frequency band different from the frequency band for the wireless power transmission, i.e., the resonance frequency band. For example, bi-directional communication may be a half-duplex Bluetooth low energy (BLE) communication protocol.

The wireless power transmitter 100 and the wireless power receiver 200 may exchange each other's characteristics and status information, i.e., power negotiation information, via the two-way communication.

In one example, the wireless power receiver 200 may transmit certain power reception state information for controlling the power level received from the wireless power transmitter 100 to the wireless power transmitter 100 via bi-directional communication, 100 can dynamically control the transmission power level based on the received power reception state information. Accordingly, the wireless power transmitter 100 not only can optimize the power transmission efficiency, but also has a function of preventing a load breakage due to an over-voltage, a function of preventing unnecessary power from being wasted due to an under-voltage And the like can be provided.

The wireless power transmitter 100 also performs functions such as authenticating and identifying the wireless power receiver 200 through bidirectional communication, identifying incompatible devices or non-rechargeable objects, identifying a valid load, and the like You may.

Hereinafter, a wireless power transmission process in a resonance mode will be described in more detail with reference to FIG.

The wireless power transmitter 100 includes a power supplier 110, a power conversion unit 120, a matching circuit 130, a transmission resonator 140, a main controller 150, and a communication unit 160, as shown in FIG. The communication unit may include a data transmitter and a data receiver.

The power supply unit 110 may supply a specific supply voltage to the power conversion unit 120 under the control of the main control unit 150. At this time, the supply voltage may be a DC voltage or an AC voltage.

The power conversion unit 120 may convert the voltage received from the power supply unit 110 into a specific voltage under the control of the main control unit 150. For this, the power conversion unit 210 may include at least one of a DC / DC converter, an AC / DC converter, and a power amplifier.

The matching circuit 130 is a circuit that matches impedances between the power conversion unit 210 and the transmission resonator 140 to maximize the power transmission efficiency.

The transmission resonator 140 may transmit power wirelessly using a specific resonance frequency according to the voltage applied from the matching circuit 130. [

The wireless power receiver 100 includes a reception resonator 210, a rectifier 220, a DC-DC converter 230, a load 240, a main controller 250 And a communication unit (260). The communication unit 260 may include a data transmitter and a data receiver.

The reception resonator 210 can receive the power transmitted by the transmission resonator 140 through the resonance phenomenon.

The rectifier 210 may perform a function of converting an AC voltage applied from the reception resonator 210 into a DC voltage.

The DC-DC converter 230 may convert the rectified DC voltage to a specific DC voltage required for the load 240.

The main control unit 250 controls the operation of the rectifier 220 and the DC-DC converter 230 or generates the characteristic and state information of the wireless power receiver 200 and controls the communication unit 260 to control the wireless power transmitter 100, And transmit the characteristics and state information of the wireless power receiver 200 to the wireless terminal. For example, the main control unit 250 may control the operation of the rectifier 220 and the DC-DC converter 230 by monitoring the output voltage and current intensity at the rectifier 220 and the DC-DC converter 230 have.

The monitored output voltage and current intensity information can be transmitted to the wireless power transmitter 100 through the communication unit 260 in real time.

In addition, the main control unit 250 compares the rectified DC voltage with a predetermined reference voltage to determine whether it is an over-voltage state or an under-voltage state, and when a system error state is detected The wireless power transmitter 100 may transmit the detection result to the wireless power transmitter 100 through the communication unit 260.

The main control unit 250 controls the operation of the rectifier 220 and the DC-DC converter 230 to prevent the load from being damaged when a system error condition is detected, or a predetermined overcurrent The power to be applied to the load 240 may be controlled by using a blocking circuit.

1, the main control units 150 and 250 and the communication units 160 and 260 are shown as being composed of different modules, but this is only one embodiment. In another embodiment of the present invention, 150, and 250 and the communication units 160 and 260 may be configured as a single module.

2 is a view for explaining types and characteristics of a wireless power transmitter according to an embodiment of the present invention.

The wireless power transmitter and the wireless power receiver according to the present invention can be classified into a class and a category, respectively.

The type and characteristics of the wireless power transmitter can be largely identified by the following three parameters.

First, the wireless power transmitter can be identified by a degree determined according to the intensity of the maximum power applied to the transmission resonator 140.

Here, the class of the wireless power transmitter is _defined as the maximum value of the power (P _TX - - _{IN - COIL} ) applied to the transmit resonator 140 by the predefined maximum input power per class specified in the following table (P _{TX _IN_MAX} ). Here, P _{TX _IN_COIL} may be a value calculated by dividing the average real number that is the product of a unit time of a transmission resonator unit time applied voltage (V (t)) and current (I (t)) to be over the 140.

Class Maximum Input Power Min Category
Support Requirements Support Max
Number of devices Class 1 2W 1 x grade 1 1 x grade 1 Grade 2 10W 1 x Grade 3 2 x Grade 2 Grade 3 16W 1 x rating 4 2 x Grade 3 Grade 4 33W 1 x Grade 5 3 x Grade 3 Rating 5 50W 1 x grade 6 4 x Grade 3 Rating 6 70W 1 x grade 6 5 x Grade 3

The grades disclosed in Table 1 above are merely one example, and new grades may be added or deleted. It should also be noted that the values for the maximum input power per class, the minimum category support requirements, and the maximum number of devices that can be supported may vary depending on the use, configuration, and implementation of the wireless power transmitter.

For example, referring to Table 1, the maximum value of P _{TX _IN_MAX} greater than or equal to a value corresponding to grade 3 of the power (P _{TX_IN_COIL)} to be applied to the transmission resonator (140), P _{TX _IN_MAX} value corresponding to grade 4 , The rating of the corresponding wireless power transmitter may be determined to be a grade 3.

Second, the wireless power transmitter may be identified according to the Minimum Category Support Requirements corresponding to the identified class.

Here, the minimum category support requirement may be a supportable number of wireless power receivers corresponding to the highest level category of the wireless power receiver category that the wireless power transmitter of the corresponding class can support. That is, the minimum category support requirement may be the minimum number of maximum category devices that the wireless power transmitter can support. At this time, the wireless power transmitter may support all categories of wireless power receivers corresponding to less than the maximum category according to the minimum category requirement.

However, if the wireless power transmitter can support a wireless power receiver of a category higher than the category specified in the minimum category support requirement, then the wireless power transmitter may not limit its support of the wireless power receiver.

For example, referring to Table 1 above, a Class 3 wireless power transmitter should support at least one Category 5 wireless power receiver. Of course, in this case, the wireless power transmitter may support a wireless power receiver 100 that falls into a category lower than the category level corresponding to the minimum category support requirement.

It should also be noted that the wireless power transmitter may support a wireless power receiver with a higher level category if it is determined that it is capable of supporting a higher level category than the category corresponding to the minimum category support requirement.

Third, the wireless power transmitter may be identified by the maximum number of supportable devices corresponding to the identified class. Here, the maximum number of devices that can be supported may be identified by the maximum number of supportable wireless power receivers corresponding to the lowest-level category among the categories that can be supported by the rating - hereinafter simply referred to as the maximum number of supportable devices .

For example, referring to Table 1 above, a Class 3 wireless power transmitter should be able to support up to two wireless power receivers with a minimum category of 3.

However, when the wireless power transmitter can support more than the maximum number of devices corresponding to its own rating, it does not limit to support more than the maximum number of devices.

The wireless power transmitter according to the present invention should perform at least the wireless power transmission in the available power up to the number defined in Table 1, unless there is a specific reason not to allow the power transmission request of the wireless power receiver.

In one example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if there is not enough available power to accommodate the power transfer request. Alternatively, the power adjustment of the wireless power receiver can be controlled.

In another example, the wireless power transmitter may not accept a power transfer request of the wireless power receiver if the number of acceptable wireless power receivers is exceeded upon accepting the power transfer request.

In another example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if the category of the wireless power receiver requesting power transmission exceeds a category level that is supported in its rating.

In another example, a wireless power transmitter may not accept a power transfer request from the wireless power receiver if the internal temperature exceeds a reference value.

3 is a view for explaining types and characteristics of a wireless power receiver according to an embodiment of the present invention.

, The received average output voltage (P _{RX _OUT)} is a voltage (V (t)) and current (I (t)) output by the receiving cavity 210 for a unit time of the resonator 210, as shown in Figure 3 May be a real number value that is calculated by dividing the product of the number of times by the unit time.

The category of the wireless power receiver may be defined based on the maximum output voltage (P _{RX_OUT_MAX} ) of the receive resonator 210, as shown in Table 2 below.

category
(Category) Maximum Input Power Application example Category 1 TBD Bluetooth Handset Category 2 3.5 W Feature phone Category 3 6.5 W Smartphone Category 4 13W Tablet Category 5 25W Small laptop Category 6 37.5 W laptop Category 6 50W TBD

For example, if the charging efficiency at the bottom stage is 80% or more, the category 3 wireless power receiver can supply 5 W of power to the charging port of the load.

The categories disclosed in Table 2 above are only examples, and new categories may be added or deleted. It should also be noted that the maximum output power per category and application examples shown in Table 2 above may also be varied depending on the use, shape and implementation of the wireless power receiver.

4 is an equivalent circuit diagram of a wireless power transmission system according to an embodiment of the present invention.

In detail, FIG. 4 shows the interface points on an equivalent circuit in which reference parameters to be described later are measured.

Hereinafter, the meaning of the reference parameters shown in FIG. 4 will be briefly described.

I _TX and I _{TX _COIL} mean the RMS (Root Mean Square) current applied to the matching circuit (or matching network) 420 of the wireless power transmitter and the RMS current applied to the transmitting resonator coil 425 of the wireless power transmitter, respectively do.

Z _{TX _IN} means the input impedance of the input impedance of the rear end of the power supply / amplifier / filter 410 of the wireless power transmitter (Input Impedance) and the matching circuit 420, the front end (Input Impedance).

Z _{TX _IN_COIL} means the input impedance of the matching circuit 420 and the rear end transmission resonator coil 425 shear.

L1 and L2 denote the inductance value of the transmitting resonator coil 425 and the inductance value of the receiving resonator coil 427, respectively.

Z _{RX _IN} means the input impedance of the filter / rectifier / load 440, the front end of the matching circuit 430, a rear end and a wireless power receiver of a wireless power receiver.

The resonance frequency used in operation of the wireless power transmission system according to an embodiment of the present invention may be 6.78 MHz ± 15 kHz.

In addition, a wireless power transmission system according to an embodiment may provide simultaneous charging - i.e., multi-charging - for a plurality of wireless power receivers, in which case the remaining wireless power receivers Can be controlled so as not to exceed a predetermined reference value or more. For example, the received power variation may be +/- 10%, but is not limited thereto.

The condition for maintaining the received power variation should not overlap the existing wireless power receiver when the wireless power receiver is added to or removed from the charging area.

When the matching circuit 430 of the wireless power receiver is connected to the rectifier, the real part of the Z _{TX - - IN} may be inversely related to the load resistance of the rectifier - hereinafter referred to as R _RECT . That is, an increase in R _RECT may decrease Z _{TX_IN,} and a decrease in R _RECT may increase Z _{TX_IN} .

The resonator coupling efficiency according to the present invention is the maximum power receiving ratio calculated by dividing the power transmitted from the receiving resonator coil to the load 440 by the power to be loaded in the resonant frequency band in the transmitting resonator coil 425 have. Resonator matching efficiency between the wireless power transmitter and wireless power receiver can be calculated if the reference port impedance (Z _{TX_IN)} and receiving a reference port impedance (Z _{_IN RX)} of the cavity resonator is a transmission that is perfectly matched.

Table 3 below is an example of the minimum resonator matching efficiency according to the class of the wireless power transmitter and the class of the wireless power receiver according to an embodiment of the present invention.

category
One category
2 category
3 category
4 category
5 category
6 category
7 Class 1 N / A N / A N / A N / A N / A N / A N / A Grade 2 N / A 74% (-1.3) 74% (-1.3) N / A N / A N / A N / A Grade 3 N / A 74% (-1.3) 74% (-1.3) 76% (-1.2) N / A N / A N / A Grade 4 N / A 50% (-3) 65% (-1.9) 73% (-1.4) 76% (-1.2) N / A N / A Rating 5 N / A 40% (-4) 60% (- 2.2) 63% (-2) 73% (-1.4) 76% (-1.2) N / A Rating 6 N / A 30% (- 5.2) 50% (-3) 54% (-2.7) 63% (-2) 73% (-1.4) 76% (-1.2)

If a plurality of wireless power receivers are used, the minimum resonator matching efficiency corresponding to the class category shown in Table 3 may be increased.

5 is a state transition diagram for explaining a state transition procedure in a wireless power transmitter according to an embodiment of the present invention.

5, the state of the wireless power transmitter is largely divided into a configuration state 510, a power save state 520, a low power state 530, a power transfer state 520, , 540, a Local Fault State 550, and a Latching Fault State 560. In addition,

When power is applied to the wireless power transmitter, the wireless power transmitter can transition to the configuration state 510. [ The wireless power transmitter may transition to a power saving state 520 when a predetermined reset timer expires in the configured state 510 or the initialization procedure is completed.

In the power saving state 520, the wireless power transmitter may generate a beacon sequence and transmit it via the resonant frequency band.

Here, the wireless power transmitter can control the beacon sequence to be started within a predetermined time after entering the power saving state 520. [ For example, the wireless power transmitter may control, but is not limited to, initiating the beacon sequence within 50 ms of the power saving state 520 transition.

In the power saving state 520, the wireless power transmitter includes a first beacon sequence (First Beacon Sequence) for sensing an object located in the charging region, where the object is an integrated concept including a wireless power receiver as well as a conductive foreign object, Periodically generates and transmits the received signal, and detects the impedance change of the reception resonator, that is, the load variation. Hereinafter, for convenience of explanation, the first beacon and the first beacon sequence will be referred to as Short Beacon and Short Beacon sequences, respectively.

In particular, the Short Beacon sequence can be repeatedly generated and transmitted at a constant time interval (tCYCLE) during a short interval (tSHORT_BEACON) so that the standby power of the wireless power transmitter can be saved until an object is detected. For example, tSHORT_BEACON may be set to 30 ms or less, and tCYCLE may be set to 250 ms ± 5 ms, respectively. Also, the current intensity of the short beacon is not less than a predetermined reference value, and can be gradually increased for a predetermined time period. For example, the minimum current intensity of the Short Beacon may be set to be sufficiently large such that a category 2 or higher wireless power receiver of Table 2 above can be sensed.

The wireless power transmitter according to the present invention may be provided with a sensing means for sensing reactance and resistance change in the reception resonator according to the short beacon.

In addition, in the power saving state 520, the wireless power transmitter may periodically generate and transmit a second beacon sequence for providing sufficient power for the booting and response of the wireless power receiver. Hereinafter, for convenience of explanation, the second beacon and the second beacon sequence will be referred to as Long Beacon and Long Beacon sequences, respectively.

That is, the wireless power receiver may broadcast a predetermined response signal over the out-of-band communication channel when booting is completed via the second beacon sequence.

In particular, the Long Beacon sequence may be generated and transmitted at a constant time interval (tLONG_BEACON_PERIOD) during a relatively long interval (tLONG_BEACON) compared to the Short Beacon to provide sufficient power to boot the wireless power receiver. For example, tLONG_BEACON may be set to 105 ms + 5 ms, and tLONG_BEACON_PERIOD may be set to 850 ms, respectively. The current intensity of the long beacon may be relatively strong compared to the current intensity of the short beacon. Also, the long beacon can maintain the power of a certain intensity during the transmission period.

Thereafter, the wireless power transmitter may wait for the reception of a predetermined response signal during the long beacon transmission interval after the impedance change of the reception resonator is detected. Hereinafter, for convenience of explanation, the response signal is referred to as an advertisement signal. Here, the wireless power receiver may broadcast an advertisement signal over an out-of-band communication frequency band that is different from the resonant frequency band.

In one example, the advertisement signal includes message identification information for identifying a message defined in the out-of-band communication standard, a unique service for identifying whether the wireless power receiver is legitimate or compatible with the wireless power transmitter, Information on the output power of the wireless power receiver, rated voltage / current information applied to the load, antenna gain information of the wireless power receiver, information for identifying the category of the wireless power receiver, wireless power receiver authentication information, Information about whether or not the wireless power receiver is installed, and software version information mounted on the wireless power receiver.

The wireless power transmitter may establish an out-of-band communication link with the wireless power receiver after transitioning from a power saving state 520 to a low power state 530 upon receipt of an advertisement signal. Subsequently, the wireless power transmitter may perform the registration procedure for the wireless power receiver over the established out-of-band communication link. For example, if out-of-band communication is a Bluetooth low-power communication, the wireless power transmitter may perform Bluetooth pairing with the wireless power receiver and exchange at least one of the status information, characteristic information, and control information of each other via the paired Bluetooth link have.

When the wireless power transmitter transmits a predetermined control signal for initiating charging via out-of-band communication in the low power state 530 (i.e., a predetermined control signal requesting the wireless power receiver to transmit power to the load) to the wireless power transmitter , The state of the wireless power transmitter may transition from the low power state 530 to the power transfer state 540. [

If the out-of-band communication link establishment procedure or registration procedure in the low power state 530 is not normally completed, the state of the wireless power transmitter may transition from the low power state 530 to the power saving state 520. [

The wireless power transmitter may be driven with a separate Link Expiration Timer for connection to each wireless power receiver and the wireless power receiver may transmit a predetermined message indicating that it is present in the wireless power transmitter at a predetermined time period Should be sent before the link expiration timer expires. Here, the link expiration timer is reset each time the message is received, and the out-of-band communication link established between the wireless power receiver and the wireless power receiver may be maintained if the link expiration timer does not expire.

If all the link expiration timers corresponding to the out-of-band communication link established between the wireless power transmitter and the at least one wireless power receiver have expired in the low power state 530 or the power transfer state 540, May transition to the power saving state (520).

In addition, the wireless power transmitter in the low power state 530 may drive a predetermined registration timer upon receipt of a valid advertisement signal from the wireless power receiver. At this time, once the registration timer has expired, the wireless power transmitter in low power state 530 may transition to power saving state 520. [ At this time, the wireless power transmitter may output a predetermined notification signal notifying the registration failure through a notification display means provided in the wireless power transmitter, for example, an LED lamp, a display screen, a beeper, have.

In addition, in the power transfer state 540, the wireless power transmitter may transition to a low power state 530 upon completion of charging all connected wireless power receivers.

In particular, the wireless power receiver may allow registration of a new wireless power receiver in states other than the configuration state 510, the local failure state 550, and the lock failure state 560. [

In addition, the wireless power transmitter can dynamically control the transmit power based on state information received from the wireless power receiver in the power transmit state 540. [

At this time, the receiver status information transmitted from the wireless power receiver to the wireless power transmitter may include information on required power information, voltage and / or current information measured at the rear end of the rectifier, charge status information, overcurrent and / or overvoltage and / Means for blocking or reducing power delivered to the load in accordance with information, overcurrent or overvoltage, or information indicating whether the device is activated or not. At this time, the receiver status information may be transmitted at a predetermined period or transmitted every time a specific event is generated. In addition, the means for interrupting or reducing the electric power delivered to the load in accordance with the overcurrent or overvoltage may be provided using at least one of an ON / OFF switch and a zener diode.

The receiver status information transmitted from the wireless power receiver to the wireless power transmitter according to another embodiment of the present invention includes information indicating that the external power is connected to the wireless power receiver by wire, information indicating that the out-of-band communication method is changed, And may be changed from NFC (Near Field Communication) to BLE (Bluetooth Low Energy) communication.

In accordance with another embodiment of the present invention, a wireless power transmitter may be configured to determine a power intensity to be received by a wireless power receiver based on at least one of the current available power, the priority of each wireless power receiver, May be adaptively determined. Here, the power intensity by the wireless power receiver can be determined as to how much power should be received in proportion to the maximum power that can be processed by the rectifier of the corresponding wireless power receiver.

The wireless power transmitter may send a predetermined power control command to the wireless power receiver that includes information regarding the determined power strength. At this time, the wireless power receiver can determine whether power control is possible based on the power intensity determined by the wireless power transmitter, and transmit the determination result to the wireless power transmitter through the predetermined power control response message.

The wireless power receiver according to another embodiment of the present invention may transmit predetermined receiver state information indicating whether wireless power control is possible according to the power control command of the wireless power transmitter before receiving the power control command.

The power transmission state 540 may be in any one of a first state 541, a second state 542 and a third state 543 depending on the power reception state of the connected wireless power receiver.

In one example, the first state 541 may indicate that the power reception state of all wireless power receivers connected to the wireless power transmitter is in a normal voltage state.

The second state 542 may mean that there is no wireless power receiver in which the power reception state of at least one wireless power receiver connected to the wireless power transmitter is in a low voltage state and in a high voltage state.

The third state 543 may mean that the power reception state of at least one wireless power receiver connected to the wireless power transmitter is in a high voltage state.

The wireless power transmitter may transition to the lock failure state 560 if a system error is detected in the power saving state 520 or the low power state 530 or the power transmission state 540

The wireless power transmitter in the lock fault condition 560 can transition to either the configuration state 510 or the power saving state 520 if it is determined that all connected wireless power receivers have been removed from the charging area.

Further, in the lock fault condition 560, the wireless power transmitter may transition to the local fault condition 550 if a local fault is detected. Here, the wireless power transmitter, which is the local failure state 550, may transition back to the lock failure state 560 if the local failure is released.

On the other hand, when transitioning from a state of either configuration state 510, power saving state 520, low power state 530, or power transfer state 540 to local fault state 550, If released, it may transition to configuration state 510.

The wireless power transmitter may shut off the power supplied to the wireless power transmitter if it transitions to the local failure state 550. [ For example, the wireless power transmitter may transition to a local fault condition 550 when a fault such as overvoltage, overcurrent, or overtemperature is detected, but is not limited thereto.

For example, the wireless power transmitter may transmit a predetermined power control command to the connected at least one wireless power receiver to reduce the strength of the power received by the wireless power receiver, if an over-current, over-voltage,

In another example, the wireless power transmitter may send a predetermined control command to the connected at least one wireless power receiver to stop the charging of the wireless power receiver if an overcurrent, overvoltage, overheating, or the like is sensed.

Through the above-described power control procedure, the wireless power transmitter can prevent the device from being damaged due to overvoltage, overcurrent, overheat or the like.

The wireless power transmitter may transition to the lock fault condition 560 if the intensity of the output current of the transmit resonator is above a reference value. At this time, the wireless power transmitter transited to the lock failure state 560 may attempt to control the power for a predetermined time such that the intensity of the transmission resonator output current is less than a predetermined reference value. Here, the power control attempt may be repeated for a predetermined number of times. If the lock failure condition 560 is not released, the wireless power transmitter transmits a predetermined notification signal indicating that the lock failure state 560 is not released to the user by using a predetermined notification means can do. At this time, if all the wireless power receivers located in the charging area of the wireless power transmitter are removed from the charging area by the user, the locking failure state 560 may be released.

On the other hand, if the intensity of the output current of the transmission resonator falls below the reference value within a predetermined time, or the intensity of the output current of the transmission resonator falls below the reference value during the predetermined repetition, the lock failure state 560 is automatically released Where the state of the wireless power transmitter may be automatically transitioned from the lock failure state 560 to the power saving state 520 to perform the detection and identification procedure for the wireless power receiver again.

The wireless power transmitter in the power transmission state 540 can transmit the continuous power and adaptively control the transmit power based on the state information of the wireless power receiver and the predefined optimal voltage region setting parameters have.

For example, the Optimal Voltage Region setting parameter may include at least one of a parameter for identifying the low voltage region, a parameter for identifying the optimum voltage region, a parameter for identifying the high voltage region, and a parameter for identifying the overvoltage region .

The wireless power transmitter can increase the transmission power if the power reception state of the wireless power receiver is in the low voltage region, and reduce the transmission power if it is in the high voltage region.

The wireless power transmitter may also control the transmit power to maximize the power transmission efficiency.

The wireless power transmitter may also control the transmit power so that the deviation of the amount of power required by the wireless power receiver is below a reference value.

The wireless power transmitter may also stop transmitting power when the rectifier output voltage of the wireless power receiver reaches a predetermined overvoltage range-that is, when Over Voltage is detected.

 6 is a state transition diagram of a wireless power receiver according to an embodiment of the present invention.

6, the state of the wireless power receiver is largely divided into a disabled state 610, a boot state 620, an enabled state 630 (or an On state), and a system error state System Error State, 640).

At this time, the state of the wireless power receiver can be determined based on the intensity of the output voltage at the rectifier end of the wireless power receiver - hereinafter referred to as VRECT for convenience of explanation.

The activation state 630 may be classified into an optimum voltage state 631, a low voltage state 632, and a high voltage state 633 depending on the value of VRECT.

The wireless power receiver in the deactivation state 610 may transition to the boot state 620 if the measured VRECT value is greater than or equal to the predefined VRECT_BOOT value.

In the boot state 620, the wireless power receiver may establish an out-of-band communication link with the wireless power transmitter and wait until the VRECT value reaches the power required at the load end.

 The wireless power receiver in the boot state 620 may transition to the active state 630 and begin charging when the VRECT value is ascertained that the power required at the lower end has been reached.

The wireless power receiver in the active state 630 may transition to the boot state 620 if it is confirmed that charging is complete or charging is interrupted.

In addition, the wireless power receiver in the active state 630 may transition to a system fault state 640 if a predetermined system fault is detected. Here, system faults may include overvoltage, overcurrent, and overheating, as well as other predefined system fault conditions.

Also, the wireless power receiver in the active state 630 may transition to the inactive state 610 if the VRECT value falls below the VRECT_BOOT value.

In addition, the wireless power receiver in the boot state 620 or the system error state 640 may transition to the inactive state 610 if the VRECT value falls below the VRECT_BOOT value.

Hereinafter, the state transition of the wireless power receiver within the active state 630 will be described in detail with reference to FIG. 7, which will be described later.

7 is a view for explaining an operation region of a wireless power receiver according to a VRECT according to an embodiment of the present invention.

Referring to FIG. 7, if the VRECT value is less than a predetermined VRECT_BOOT, the wireless power receiver is held in the inactive state 610. [

Thereafter, if the VRECT value is increased beyond VRECT_BOOT, the wireless power receiver transitions to the boot state 620 and may broadcast the advertisement signal within a predetermined time. Thereafter, if an advertisement signal is detected by the wireless power transmitter, the wireless power transmitter may transmit a predetermined connection request signal for setting the out-of-band communication link to the wireless power receiver.

The wireless power receiver waits until the out-of-band communication link is successfully established and the VRECT value reaches the minimum output voltage at the rectifier for normal charging-hereinafter referred to as VRECT_MIN for ease of explanation-if successful. .

If the VRECT value exceeds VRECT_MIN, the state of the wireless power receiver transitions from the boot state 620 to the active state 630 and may begin charging the load.

If, in the active state 630, the VRECT value exceeds the predetermined reference VRECT_MAX for determining the overvoltage, the wireless power receiver may transition from the active state 630 to the system fault state 640. [

Referring to FIG. 7, the active state 630 is divided into a low voltage state 632, an optimum voltage state 631, and a high voltage state 633 according to the value of VRECT .

VRECT_HIGH < VRECT < = VRECT_MAX, while the low voltage state 632 means a state where VRECT_BOOT <= VRECT <= VRECT_MIN, the optimum voltage state 631 means VRECT_MIN <VRECT <= VRECT_HIGH, Quot; state. &Lt; / RTI &gt;

In particular, the wireless power receiver transited to the high voltage state 633 may suspend the operation of shutting off the power supplied to the load for a predetermined time-called a high voltage state holding time for convenience of explanation. At this time, the high-voltage state hold time can be predetermined so as to prevent damage to the wireless power receiver and the load in the high-voltage state 633.

When the wireless power receiver transitions to the system error state 640, it may transmit a predetermined message indicating an overvoltage occurrence to the wireless power transmitter via an out-of-band communication link within a predetermined time.

 The wireless power receiver may also control the voltage applied to the load using overvoltage blocking means provided to prevent damage to the load due to the overvoltage in the system fault state 630. [ Here, an ON / OFF switch and / or a zener diode may be used as the overvoltage shutoff means.

Although a method and means for responding to a system error in a wireless power receiver when an overvoltage is generated in the wireless power receiver and transitioned to a system error state 640 has been described in the above embodiment, Other embodiments may also transition to a system fault state by overheating, overcurrent, and the like in the wireless power receiver.

As an example, if the system transitions to a system fault state due to overheating, the wireless power receiver may send a message to the wireless power transmitter indicating the occurrence of overheating. At this time, the wireless power receiver may drive a cooling fan or the like to reduce internally generated heat.

A wireless power receiver according to another embodiment of the present invention may receive wireless power in cooperation with a plurality of wireless power transmitters. In this case, the wireless power receiver may transition to a system error state 640 if it is determined that the wireless power transmitter that is determined to receive the actual wireless power is different from the wireless power transmitter where the actual out-of-band communication link is established.

8 is a flowchart illustrating a wireless charging procedure in a wireless charging system supporting an electromagnetic resonance method according to an embodiment of the present invention.

Referring to FIG. 8, the wireless power transmitter is booted according to power application, and when the configuration is completed, the wireless power transmitter transitions to a power saving state, generates a beacon sequence, and transmits the beacon sequence through a transmission resonator (S801).

When the beacon sequence is detected, the wireless power receiver transitions to the boot state when the beacon sequence is detected, and broadcasts an advertisement signal including its own identification information and characteristic information to search for the wireless power transmitter (S803 ). At this time, the advertisement signal may be repeatedly transmitted at predetermined cycles until a connection request signal, which will be described later, is received from the wireless power transmitter.

Upon receiving the advertisement signal, the wireless power transmitter may transmit a connection request signal (Connection Request Signal) to the wireless power receiver to establish an out-of-band communication link with the wireless power receiver (S805).

When the connection request signal is received, the wireless power receiver sets an out-of-band communication link and transmits its own static characteristic (PRU Static Characteristic) message through the established out-of-band communication link (S807).

Here, the static status characteristic message of the wireless power receiver includes information such as category information, hardware and software version information, maximum rectifier output power information, initial reference parameter information for power control, information on demand voltage or power, Information about a supported out-of-band communication method, information on a supportable power control algorithm, and preferred rectifier voltage value information initially set in the wireless power receiver.

The wireless power transmitter may transmit the PTU Static Characteristic message of the wireless power transmitter to the wireless power receiver via the out-of-band communication link when the static status characteristic message of the wireless power receiver is received (S809).

Here, the static characteristic message of the wireless power transmitter includes at least one of transmitter power information, class information, hardware and software version information, information on the maximum number of supportable wireless power receivers, and / or information on the number of currently connected wireless power receivers And may be configured to include one.

Thereafter, the wireless power receiver monitors its real-time power receiving and charging status and may transmit a Dynamic Characteristic message to the wireless power transmitter at periodic or specific event occurrence (S811).

Here, the dynamic characteristic message of the wireless power receiver includes information on the rectifier output voltage and current, information on the voltage and current applied to the load, information on the internal measured temperature of the wireless power receiver, reference parameter change information A rectified voltage minimum value, a rectified voltage maximum value, and an initially set preferred rectifier terminal voltage change value), charging state information, system error information, and alarm information.

In addition, the wireless power transmitter may transition to a power transfer state when sufficient power is available to charge the wireless power receiver, and control the wireless power receiver to initiate charging by sending a predetermined control command over the out-of-band communication link (S813). The wireless power receiver transitions from the boot state to the active state upon receipt of a wireless power receiver control (PRU Control) message indicating the start of charging.

Thereafter, the wireless power transmitter may dynamically control the transmit power based on the dynamic characteristics message periodically received from the wireless power receiver (S815).

In addition, the wireless power receiver may be configured to identify a system error through an alarm field (Alert Field) included in the dynamic property message or a separate wireless power receiver alarm (PRU Alert) message if an internal system error is detected or the charging is complete Data and / or data indicating that the charging is completed, to the wireless power transmitter (S817). Here, data transmitted through an alarm field or an alarm message may include, but is not limited to, overcurrent, overvoltage, overtemperature, wireless power receiver self-protection, charging completion, wired charge detection, mode switching,

If the dynamic characteristic message or the information contained in the PRU Alert message is a message informing that a specific system error has occurred, the wireless power transmitter may transition from the power transmission state to the lock failure state. Of course, if a system error is detected in the active state, the wireless power receiver transitions to a system error state.

9 is a configuration diagram of a wireless power transmission system according to an embodiment of the present invention.

As shown in FIG. 9, the wireless power transmission system may be configured with a star topology, but is not limited thereto.

The wireless power transmitter may collect various characteristics and status information from the wireless power receiver over the out-of-band communication link and may control the operation and transmit power of the wireless power receiver based on the collected information.

The wireless power transmitter may also transmit its own characteristic information and a predetermined control signal to the wireless power receiver via an out-of-band communication link.

In addition, the wireless power transmitter may determine the power transmission order of the wireless power receivers of the connected wireless power receiver and may also transmit wireless power according to the determined power transmission order. As an example, the wireless power transmitter may be configured to select a category of the wireless power receiver, a pre-assigned priority for the wireless power receiver, a power receiving efficiency of the wireless power receiver or a power transmission efficiency at the wireless power transmitter, The power transmission order can be determined based on at least one of resonance matching efficiency, charging efficiency in load, charging state of the wireless power receiver, and occurrence of system error in each wireless power receiver.

The wireless power transmitter may also determine the amount of power to be transmitted per connected wireless power receiver. For example, the wireless power transmitter can calculate the amount of power to be transmitted for each wireless power receiver based on the currently available power amount and the power receiving efficiency for each wireless power receiver, and transmits information about the calculated amount of power to the wireless power receiver .

In addition, the wireless power transmitter may also be configured such that when a new wireless power receiver is added to the charging area, the existing charging wireless power receiver is removed from the charging area, and the charging of the existing charging wireless power receiver is completed, The system may initiate a power redistribution procedure if a change in wireless charge state, such as when a system failure of the system is detected, is detected. At this time, the power redistribution result may be transmitted to the wireless power receiver through a predetermined control message.

The wireless power transmitter may also generate and provide a time synchronization signal (Tim Synchronization Signal) to the wireless power receiver to obtain time synchronization with the networked wireless power receiver (s). Here, the time synchronizing signal includes a frequency band for transmitting radio power, that is, an in-band (In-Bnad) or a frequency band for performing out-of-band communication, that is, an out-of-band Lt; / RTI &gt; The wireless power transmitter and the wireless power receiver can manage the communication timing and communication sequence of each other based on the time synchronization signal.

FIG. 9 shows a configuration in which a wireless power transmission system composed of one wireless power transmitter and a plurality of wireless power receivers are networked in a star topology, but this is only one embodiment, and in accordance with another embodiment of the present invention A wireless power transmission system is capable of a plurality of wireless power transmitters and a plurality of wireless power receivers network-connected to transmit and receive wireless power.

In this case, the wireless power transmitter may transmit its status information or the status information of the wireless power receiver connected thereto (via its own communication channel) to another wireless power transmitter connected to the network.

In addition, if the wireless power receiver is a mobile device, the wireless power receiver may control to allow seamless power to be received by the mobile wireless power receiver through handover between the wireless power transmitters.

If one radio power receiver simultaneously receives radio power from a plurality of radio power transmitters during the handover procedure, the radio power receiver sums the power received from each radio power transmitter, and based on that the charging of the load It is possible to calculate the estimated time required until completion. That is, the electronic device connected to the wireless power receiver or the wireless power receiver can calculate the expected charging completion time adaptively according to the handover and control it to be displayed on the display screen.

The wireless power transmitter also acts as a network coordinator and can exchange information with the wireless power receiver over an out-of-band communication link. For example, the wireless power transmitter may receive various information of the wireless power receiver to generate and manage a predetermined device control table, and may transmit network management information to the wireless power receiver based on the device control table. This allows the wireless power transmitter to create and maintain a wireless power transmission system network.

A wireless power transmission system according to another embodiment of the present invention may be composed of a plurality of single type wireless power transmitters and a wireless power receiver. Here, a single type wireless power transmitter may mean a device that always communicates with one wireless power receiver to perform power transmission.

In the case of a single type wireless power transmitter, the first received response signal corresponding to the power signal for identifying the wireless power receiver - for example, may be a long beacon of the A4WP standard - Communication with a wireless power receiver corresponding to an Advertisement Signal may be connected to initiate power transmission.

For the sake of convenience, a wireless power transmitter capable of communicating with a plurality of wireless power receivers and transmitting power to the plurality of wireless power receivers in contrast to a single type wireless power transmitter is referred to as a multi-type wireless power transmitter I will name it.

In one example, a multi-type wireless power transmitter may transmit power to a plurality of wireless power receivers communicatively coupled in a time-sharing manner, but is not limited thereto. In one example, the wireless power transmitter may adaptively control the amount of power transmitted during a unit of time based on at least one of a category, a requested power, an available power, and a priority of a communicatively coupled wireless power receiver.

10 is a diagram for explaining a cross-connection problem in a wireless power transmission system according to the present invention.

It should be noted that the first wireless power transmitter (TX1, 1010) and the second wireless power transmitter (TX2, 1020) shown in FIG. 10 are a single type wireless power transmitter.

In a conventional wireless charging system, if power is applied to TX1 1010 and TX2 1020 at the same time, the booting can be completed at approximately the same time as TX1 1010 and TX2 1020, Lt; RTI ID = 0.0 &gt; a &lt; / RTI &gt; beacon sequence.

In this case, the first wireless power receiver (RX1, 1030) and the second wireless power receiver (RX2, 1040) are booted using the received beacon signal, and a response signal corresponding to the beacon signal , Which may be an advertisement signal defined in the A4WP standard, and broadcast it over the out-of-band communication channel.

 Hereinafter, for convenience of description, it is assumed that a response signal corresponding to a beacon signal for detecting a wireless power receiver is an advertisement signal defined in the A4WP standard.

For convenience of explanation, a response signal corresponding to the long beacon signal for sensing or identifying the wireless power receiver will be described in combination with the second signal.

The first advertisement signal broadcast by the RX1 1030 is first received by the TX2 1020 over the TX1 1010 and the second advertisement signal transmitted by the RX2 1040, For the sake of convenience in the following description, when the a2-name card is received first in the TX1 1010 than in the TX2 1020, a cross connection can be made.

For example, when a cross-connect is established, RX1 1030 may send more power to the TX2 1020 over the out-of-band communication channel, since the power sent by TX2 1020 is not normally received by RX1 1030 Can be requested. At this time, a heat phenomenon may occur in the RX2 1040 disposed in the charging region of the TX2 1020. [

11 is a diagram for explaining a wireless power transmission procedure in a wireless power transmitter according to an embodiment of the present invention.

Referring to FIG. 11, when power is applied, the wireless power transmitter enters a configuration state and initiates a booting procedure. When booting is complete, the wireless power transmitter enters a power saving state and initiates a predetermined beacon sequence transmission procedure.

Upon sensing a load change during beacon sequence transmission, the wireless power transmitter enters a low power state after transmitting a long beacon signal and initiates a registration procedure for the wireless power receiver. In the low power state, when the wireless power transmitter receives an advertisement signal from the wireless power receiver, it attempts to establish a communication connection with the wireless power receiver.

The wireless power transmitter enters a power transfer state and initiates charging when the normal communication connection and registration with the wireless power receiver is completed. If the load change is not detected in the power saving state, or if the advertisement signal is not received after the long beacon transmission due to the load change detection, the wireless power transmitter can resume the beacon sequence transmission procedure.

As an example, during the power saving state, the long beacon and the short beacon may be transmitted with a certain period. At this time, the long beacon transmission period and the short beacon transmission period may be different from each other. Particularly, in case of short beacon, the intensity of the transmitted power may be changed by a certain level in every transmission period, but the present invention is not limited to this, and it may be transmitted with the power of the same intensity.

If it is detected that foreign matter exists in the charging area in the power saving state, at least one of the transmission period of the long beacon and / or the short beacon, the intensity of the transmitted power, and the amount of the transmitted power during the unit time may be changed.

For example, if a foreign object is detected in a power saving state, the wireless power transmitter may change the transmission period of the long beacon and / or short beacon to be longer than before the foreign object is detected.

In another example, if a foreign object is detected in a power saving state, the wireless power transmitter may change the power intensity of the long beacon and / or short beacon to be lower than before the foreign object is detected.

12 is a flowchart illustrating a method of avoiding a cross connection in a wireless power transmission apparatus according to an embodiment of the present invention.

12, when a wireless power transmission apparatus senses an object placed in a charging region in a power saving state, it can generate a specific code corresponding to the object, that is, a first pattern code for convenience of explanation (S1210 to S1220).

In one example, the first pattern code may include device identification information of the wireless power transmission device, power class information assigned to the wireless power transmission device, hardware version information or (and) firmware version information of the wireless power transmission device, And version information. Here, the device identification information may include at least one of unique serial number information, manufacturer code information, and product code information corresponding to the wireless power transmission apparatus. In one example, the first pattern code may be generated using a predetermined generation function that takes as a factor at least one of various kinds of information corresponding to the wireless power transmission apparatus. Here, the length of the first pattern code and the generating polynomial are not limited.

The wireless power transmission apparatus may generate a first signal for identifying the sensed object based on the generated first pattern code (S1230). Here, the first signal may be a long beacon signal defined in the A4WP standard, but is not limited thereto. For example, the wireless power transmission apparatus may encode the first pattern code using a specific coding technique, modulate the long beacon signal according to a predetermined modulation scheme, and transmit the long beacon signal according to the encoded data.

For example, the coding technique may include, but is not limited to, a Manchester encoding scheme, a line coding scheme, a block coding scheme, and the like.

For example, at least one of a frequency modulation method, a phase modulation method, and an amplitude modulation method may be applied as the modulation method, but the present invention is not limited thereto.

The wireless power transmission apparatus can wirelessly transmit the generated first signal through the transmission resonator (S1240). At this time, the state of the wireless power transmission apparatus can transition from the power saving state to the low power state.

The wireless power transmission apparatus can confirm whether a second signal including the second pattern code is received through short-range wireless communication within a predetermined time after transmitting the first signal (S1250). Here, the second signal may be an advertisement signal defined in the A4WP standard, but is not limited thereto.

As a result, if the second signal is received, the wireless power transmission apparatus can compare whether the first pattern code and the second pattern code are the same (S1260).

If they are the same, the wireless power transmission apparatus can set an out-of-band communication channel with the wireless power reception apparatus corresponding to the second signal (S1270).

As a result of the comparison in step 1260, if it is not the same, the wireless power transmission apparatus can enter the above step 1240, but this is only one embodiment, and in step 1210, the wireless power transmission apparatus may enter step 1210.

As a result of step 1250, if the second signal is not received, the wireless power transmission apparatus may enter step 1240. However, this is an example only. In step 1210, It is possible.

13 is a flowchart illustrating a method of avoiding a cross connection in a wireless power receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 13, the wireless power receiving apparatus can transition to a boot state by a first signal received through a reception resonator in an inactive state (S1310).

The wireless power receiving apparatus can demodulate the first signal and extract the pattern code included in the first signal (S1320). Here, the first signal may be a long beacon signal defined in the A4WP standard, but is not limited thereto.

The wireless power receiving apparatus generates a second signal including the extracted pattern code, and broadcasts the generated second signal through the near field wireless communication (S1330). Here, the second signal may be an advertisement signal defined in the A4WP standard, but is not limited thereto.

The wireless power receiving apparatus can confirm whether a connection request signal is received within a predetermined time after broadcasting the second signal (S1340).

As a result, if the connection request signal is received, the wireless power receiving apparatus can attempt to establish a communication connection with the wireless power transmitting apparatus corresponding to the received connection request signal (S1350).

The wireless power receiving apparatus according to another embodiment of the present invention may receive a plurality of first signals within a predetermined time. In this case, the wireless power receiving device measures the signal strength for each of the received first signals-for example, but not limited to RSSI-and measures the first signal having the largest measured signal strength The method further comprising the steps of: At this time, the wireless power receiving apparatus can extract a pattern code corresponding to the identified first signal.

FIG. 14 is a flowchart for explaining a cross-connection avoiding method in a wireless power transmission apparatus according to another embodiment of the present invention.

Referring to FIG. 14, when a wireless power transmission apparatus senses an object placed in a charging region in a power saving state, it can wirelessly transmit a first signal for identifying the sensed object through a transmission resonator (S1410 to S1420 ). Here, the first signal may be transmitted over a first frequency band that is an operating frequency - or resonance frequency - for wireless power transmission.

The wireless power transmission apparatus can confirm whether the second signal is received through short-range wireless communication within a predetermined time after the first signal is transmitted (S1430). Here, the second signal may be transmitted through a specific second frequency band different from the first frequency band. For example, the second frequency band may be a 6.78 MHz band, which is a low power Bluetooth communication frequency band, but is not limited thereto.

The wireless power transmission apparatus can confirm whether the number of the second signals received through short-range wireless communication is plural within a predetermined time (S1440).

As a result, if it is a plurality, the wireless power transmission apparatus can measure the signal strength of each of the received second signals (S1450).

The wireless power transmission apparatus can determine the second signal having the highest measured signal strength and identify the wireless power receiving apparatus corresponding to the determined second signal (S1460).

The wireless power transmission apparatus can establish an out-of-band communication channel with the identified wireless power reception apparatus (S1470).

If it is determined in step 1440 that the number of the second signals received through short-range wireless communication is one, that is, the number of steps, within a predetermined time, the wireless power transmission apparatus transmits the wireless power reception apparatus corresponding to the second signal, An external communication channel can be set (S1480).

As a result of step 1430, if the second signal is not received within a predetermined time, the wireless power transmission apparatus may enter step 1420. However, this is an example only. In another example, Step.

As shown in Fig. 14, the wireless power transmission apparatus can transition from the power saving state to the low power state when the second signal is received.

15 is a block diagram illustrating a structure of a wireless power transmission apparatus according to an embodiment of the present invention.

15, the wireless power transmission apparatus 1500 includes a communication unit 1510, a pattern code comparing unit 1520, a memory 1530, a pattern code generating unit 1540, a power transmitting unit 1550, 1560).

The communication unit 1510 can transmit and receive status information and control signals to and from the wireless power receiver. The communication unit 1510 may perform out-of-band communication using a frequency different from a frequency used for wireless power transmission. As an example, the out-of-band communication may be a short-range wireless communication. For example, the short-range wireless communication may be any one of Bluetooth communication, NFC (Near Field Communication) communication, Wi-Fi communication, and RFID communication, but is not limited thereto.

The pattern code generation unit 1540 may generate a specific code corresponding to the wireless power transmission apparatus 1500 (hereinafter referred to as a first pattern code) for convenience of explanation.

For example, the first pattern code may include device identification information of the wireless power transmission apparatus 1500, power class information allocated to the wireless power transmission apparatus 1500, hardware version information of the wireless power transmission apparatus 1500, And / or at least one of firmware version information, standard protocol version information, and firmware version information. Here, the device identification information may include at least one of unique serial number information, manufacturer code information, and product code information.

The memory 1530 may store various kinds of information corresponding to the wireless power transmission apparatus 1500 required for generating the first pattern code. The pattern code generation unit 1540 can generate the first pattern code with reference to the memory 1530. [

In another example, if the wireless power transmission apparatus 1500 can acquire the current time information, the pattern code generation unit 1540 may generate the first pattern code by further using the current time information. In this case, a more random first pattern code can be generated. The pattern code generation unit 1540 may generate the first pattern code by further using the current time information at each beacon transmission period.

The pattern code generation unit 1540 may store the generated first pattern code in a predetermined recording area of the memory 1530. [

The power transmission unit 1550 may convert the DC power to an AC power signal, and then transmit the AC power signal wirelessly through the transmission resonator.

For example, the power transmitting unit 1550 may modulate the beacon signal based on the first pattern code in the power saving state, and wirelessly transmit the modulated beacon signal through the transmitting resonator. Here, the beacon signal modulated based on the first pattern code may be a long beacon signal.

In another example, the power transmitting unit 1550 may encode the first pattern code using a predetermined coding technique in the power saving state. The power transmitting unit 1550 may generate the long beacon signal by modulating the encoded data with a predetermined modulation scheme.

For example, the coding technique may include, but is not limited to, a Manchester encoding scheme, a line coding scheme, a block coding scheme, and the like.

For example, at least one of a frequency modulation method, a phase modulation method, and an amplitude modulation method may be applied as the modulation method, but the present invention is not limited thereto.

The sensing unit 1560 can sense the object when the object is placed in the charging area. For example, the sensing unit 1560 may identify whether an object is disposed in the charging area based on a load change with respect to a beacon signal transmitted in a power saving state, but this is merely an example, Various sensors, for example, a pressure sensor for detecting a change in pressure due to the arrangement of objects, a capacitance sensor for sensing a change in capacitance due to the arrangement of conductive objects, and a light sensor for detecting variation in illumination depending on the arrangement of objects, May be used to sense an object placed in the charging area.

When the communication unit 1510 receives the response signal corresponding to the beacon signal in the low power state (for example, it may be an advertisement signal defined in the A4WP standard), the communication unit 1510 can extract the pattern code by demodulating the advertisement signal. Hereinafter, for convenience of explanation, the demodulated pattern code will be referred to as a second pattern code. Here, the second pattern code may be transmitted to the pattern code comparing unit 1520.

When the second pattern code is received, the pattern code comparing unit 1520 can extract the first pattern code by referring to the memory 1530, and compare the first pattern code and the second pattern code.

If the comparison result is the same, the pattern code comparing unit 1520 may transmit to the control unit 1570 a predetermined first control signal indicating that a response signal has been received from the wireless power receiver disposed in the charging area of the wireless IC card.

Upon receiving the first control signal, the control unit 1570 can set a communication channel with the corresponding wireless power receiver in a low power state.

On the other hand, if the comparison result is not the same, the pattern code comparing unit 1520 may transmit to the control unit 1570 a second control signal indicating that a response signal has been received from another wireless power receiver not disposed in its charging area .

When the second control signal is received, the controller 1570 can transition to the power saving state.

The controller 1570 can control power to be supplied to only one wireless power receiver at a time. To this end, the controller 1570 may attempt to establish a communication connection with only one wireless power receiver located in its charging area.

16 is a block diagram illustrating a structure of a wireless power receiving apparatus according to an embodiment of the present invention.

16, the wireless power receiving apparatus 1600 may include a power receiving unit 1610, a pattern code extracting unit 1620, a communication unit 1630, and a control unit 1640.

The wireless power receiving apparatus 1600 may start the booting procedure when the power received through the power receiving unit 1610 is equal to or greater than a predetermined reference value.

When the booting is completed, the control unit 1640 can control the pattern code extracting unit 1620 to demodulate the beacon signal received through the power receiving unit 1610 to extract the pattern code.

The pattern code extracting unit 1620 may extract the pattern code by demodulating the beacon signal received through the power receiving unit 1610 and may transmit the extracted pattern code to the control unit 1640. [

The control unit 1640 generates a response signal including the extracted pattern code, and transmits the generated response signal through the communication unit 1630.

The communication unit 1630 can transmit and receive status information and control signals to and from the wireless power transmission apparatus. The communication unit 1630 may perform out-of-band communication using a frequency different from a frequency used for wireless power transmission. As an example, the out-of-band communication may be a short-range wireless communication. For example, the short-range wireless communication may be any one of Bluetooth communication, NFC (Near Field Communication) communication, Wi-Fi communication, and RFID communication, but is not limited thereto.

17 is a block diagram illustrating a structure of a wireless power transmission apparatus according to another embodiment of the present invention.

17, the wireless power transmission apparatus 1700 includes a communication unit 1710, a measurement unit 1720, a determination unit 1730, a power transmission unit 1740, a sensing unit 1750, and a control unit 1760 .

The communication unit 1710 can transmit and receive status information and control signals to and from the wireless power receiver. The description of the communication unit 1710 is replaced with the description of Fig.

The measuring unit 1730 may measure the intensity of the signal received through the communication unit 1710 and may transmit the measurement result to the determining unit 1730. [

For example, the measuring unit 1730 may measure the RSSI (Received Signal Strength Indicator) of the response signal (or the second signal) received through the communication unit 1710 in real time and may transmit the measurement result to the determining unit 1730 . The determination unit 1730 may finally confirm the wireless power receiver that communicates with the wireless power receiver corresponding to the second signal having the largest RSSI value. Thereafter, when the control unit 1760 receives the determination result from the determination unit 1730, it can attempt to establish communication with the corresponding wireless power receiver based on the determination result.

In another example, the communication unit 1710 may receive a plurality of second signals for a predetermined period of time. In this case, the measuring unit 1720 can measure the signal strength of each of the plurality of second signals. If the measured signal strength is RSSI, the measuring unit 1720 may transmit the measured RSSI value for each second signal to the controller 1760.

The control unit 1760 can identify the second signal having the largest RSSI and try to establish a communication connection with the wireless power receiver corresponding to the identified second signal. Generally, the strength of a signal received in the radio section is attenuated as the transmission distance increases. Therefore, the RSSI of the second signal transmitted by the wireless power receiving apparatus closest to the wireless power transmitting apparatus 1700 can be measured to be the highest.

As described above, the wireless power transmission apparatus 1700 according to the present embodiment prevents communication with a wireless power receiving apparatus disposed in a charging area of another wireless power transmission apparatus, that is, can do.

The power transmission unit 1740 may convert the DC power to an AC power signal, and then transmit the AC power signal via the transmission resonator. In particular, the power transmitting unit 1740 can generate a beacon signal in a power saving state, and transmit the beacon signal wirelessly through the transmitting resonator.

The sensing unit 1750 can sense the object when the object is placed in the charging area. For example, the sensing unit 1750 can identify whether or not an object is disposed in the charging area based on a change in the load of the beacon signal transmitted in the power saving state. However, this is merely an example, Sensors, for example, pressure sensors for sensing changes in pressure as a result of object placement, capacitive sensors for sensing changes in capacitance due to placement of conductive objects, and illumination sensors for sensing changes in illumination as a result of object placement To detect an object placed in the charging area.

The communication unit 1710 can transmit the response signal corresponding to the beacon signal in the low power state to the measurement unit 1720 when it is received, for example, the advertisement signal defined in the A4WP standard.

For convenience of explanation, a response signal corresponding to the long beacon signal for sensing or identifying the wireless power receiver will be described in combination with the second signal.

For example, when a predetermined object detection signal indicating that an object is disposed in the charging area is received from the sensing unit 1750, the control unit 1760 transmits a predetermined receiver detection signal (for example, Or a first signal), which may be, for example, a long beacon signal defined in the A4WP standard. The control unit 1760 may control all the second signals received through the communication unit 1710 to be transmitted to the measuring unit 1720 within a predetermined time after the receiver detection signal is transmitted.

The controller 1760 can control power to be supplied to only one wireless power receiver at a time. For this purpose, the controller 1760 may control the communication connection with one wireless power receiver disposed in its charging area.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (27)

A method of wireless power transmission in a wireless power transmitter,
Sensing an object disposed in the charging area;
Generating a first pattern code corresponding to the wireless power transmitter when the object is sensed;
Transmitting a first signal including the first pattern code; And
Determining a wireless power receiver to which a communication is to be connected by comparing the first pattern code and the second pattern code when the second signal including the second pattern code is received,
/ RTI &gt; The method according to claim 1,
Wherein the wireless power transmitter is a wireless power transmitter that supplies power to only one wireless power receiver at a time. The method according to claim 1,
Wherein the first pattern code is generated using at least one of device identification information, power class information, hardware version information, firmware version information, and standard protocol version information corresponding to the wireless power transmitter. The method of claim 3,
Wherein the device identification information includes at least one of unique serial number information, manufacturer code information, and product code information. The method according to claim 1,
Wherein the first signal is a power signal transmitted through a transmission resonator. 6. The method of claim 5,
Wherein the first signal is a long beacon signal transmitted to identify the sensed object in a power saving state. The method according to claim 1,
And the second signal is received via short-range wireless communication. 8. The method of claim 7,
Wherein the second signal is an advertisement signal received via a Bluetooth communication in a low power state. The method according to claim 1,
Wherein the first pattern code is encoded using a predetermined coding technique and then modulated and transmitted. The method according to claim 1,
Determining a wireless power receiver corresponding to the second signal with the first pattern code and the second pattern code matching the wireless power receiver to connect the communication. The method according to claim 1,
And transmitting the first signal or sensing the object if the first pattern code and the second pattern code do not match. A method of wireless power transmission in a wireless power transmitter,
Sensing an object disposed in the charging area;
Transmitting a first signal for identifying the sensed object through the first frequency band when the object is sensed;
Receiving a second signal corresponding to the first signal through a second frequency band;
Measuring a signal strength of the received second signal; And
Determining a wireless power receiver to which to communicate based on the measured signal strength
/ RTI &gt; 13. The method of claim 12,
Wherein the first signal is a long beacon signal transmitted to identify the sensed object in a power saving state and the second signal is an advertisement signal received via a Bluetooth communication in a low power state. 13. The method of claim 12,
The step of measuring the signal strength of the received second signal
Confirming whether the second signal received within a predetermined time after the first signal transmission is plural; And
As a result of the checking, if there are a plurality of signals, measuring a Received Signal Strength Indicator (RSSI) corresponding to each of the second signals
Wherein the RSSI corresponds to a second signal with the largest RSSI to a wireless power receiver to which to communicate. 15. The method of claim 14,
Wherein the wireless power transmitter is a wireless power transmitter that supplies power to only one wireless power receiver at a time. 13. The method of claim 12,
Wherein the wireless power transmitter is a wireless power transmitter that supplies power to only one wireless power receiver at a time. A sensing unit for sensing an object disposed in the charging area;
A pattern code generator for generating a first pattern code corresponding to the wireless power transmitter when the object is sensed;
A power transmitter for transmitting a first signal including the first pattern code;
A communication unit for receiving a second signal including a second pattern code;
A pattern code comparing unit for comparing whether the one pattern code is identical to the second pattern code; And
And a controller for establishing a wireless power receiver to which the communication is to be connected based on the comparison result
And a second power supply. 18. The method of claim 17,
The control unit controls to supply power to only one wireless power receiver at a time. 18. The method of claim 17,
Wherein the first pattern code is generated using at least one of device identification information, power class information, hardware version information, firmware version information, and standard protocol version information corresponding to the wireless power transmitter. 20. The method of claim 19,
Wherein the device identification information includes at least one of unique serial number information, manufacturer code information, and product code information. 18. The method of claim 17,
Wherein the first signal is a long beacon signal transmitted to identify the sensed object in a power saving state. 18. The method of claim 17,
And the second signal is an advertisement signal received via Bluetooth communication in a low power state. 22. The method of claim 21,
The power transmission unit
Wherein the first pattern code is encoded using a predetermined coding technique and then modulated with a predetermined modulation scheme to generate the long beacon signal. 18. The method of claim 17,
The control unit
And establishes a wireless power receiver corresponding to the second signal with the first pattern code and the second pattern code matching the wireless power receiver to connect the communication. A sensing unit for sensing an object disposed in the charging area;
A power transmitting unit for transmitting a first signal for identifying the sensed object through the first frequency band when the object is sensed;
A communication unit for receiving a second signal corresponding to the first signal through a second frequency band;
A measuring unit measuring a signal intensity of the received second signal; And
Determining a wireless power receiver to which to communicate based on the measured signal strength;
And a second power supply. 26. The method of claim 25,
Wherein the first signal is a long beacon signal transmitted to identify the sensed object in a power saving state and the second signal is an advertisement signal received via a Bluetooth communication in a low power state. 26. The method of claim 25,
The measuring unit
Measuring a Received Signal Strength Indicator (RSSI) corresponding to each of the second signals if the second signals received within a predetermined time after the first signal transmission are plural,
Wherein the determining unit determines a wireless power receiver corresponding to a second signal with the highest RSSI to a wireless power receiver to which to communicate.

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