KR20180062775A - Wireless Charging Method and Apparatus and System therefor - Google Patents

Abstract

The present invention relates to a wireless power transmission technology and, more specifically, to a wireless charging method, capable of high-speed wireless charging, and an apparatus and a system therefor. According to an embodiment of the present invention, a wireless power transmitter comprises: a power transmission unit which comprises at least one transmission coil; a power conversion unit which converts a level of power applied from the outside; and a control unit which controls a charging mode and a charging power amount for the wireless power receiver. The charging mode comprises a first charging mode and a second charging mode. The control unit performs control to convert the charging mode from the first charging mode to the second charging mode based on a charging mode packet received from the wireless power receiver. The control unit controls the charging power amount based on a control error packet received from the wireless power receiver. The control unit changes a method for controlling the charging power amount based on the control error packet when the charging mode is converted from the first charging mode to the second charging mode. The charging mode packet may include information of a power control stop time.

Description

Technical Field [0001] The present invention relates to a wireless charging method, and a wireless charging method and apparatus and system therefor.

The present invention relates to a wireless power transmission technique, and more particularly, to a wireless charging method capable of high-speed wireless charging and an apparatus and system therefor.

Portable terminals, such as mobile phones and laptops, include a battery for storing power and a circuit for charging and discharging the battery. In order for the battery of such a terminal to be charged, power must be supplied from an external charger.

2. Description of the Related Art [0002] Generally, as an example of an electrical connection between a charging device and a battery for charging electric power of a battery, a commercial electric power is supplied to a terminal for converting electric power into voltage and current corresponding to the battery, Supply method. This type of terminal supply is accompanied by the use of physical cables or wires. Therefore, when handling a lot of terminal-supplied equipment, many cables occupy considerable work space, are difficult to organize, and are not well apparent. Also, the terminal supply method may cause problems such as instantaneous discharge due to different potential difference between terminals, burnout due to foreign substances, fire, natural discharge, battery life and deterioration of performance.

In order to solve such a problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly are proposed. In addition, since the wireless charging system has not been installed in some portable terminals in the past and the consumer has to purchase a separate wireless charging receiver accessory, the demand for the wireless charging system is low, but the wireless charging user is expected to increase rapidly. Wireless charging function is expected to be equipped basically.

Generally, a wireless charging system comprises a wireless power transmitter for supplying electric energy in a wireless power transmission mode and a wireless power receiver for receiving electric energy supplied from a wireless power transmitter to charge the battery.

Such a wireless charging system may transmit power by at least one wireless power transmission scheme (e.g., electromagnetic induction scheme, electromagnetic resonance scheme, RF wireless power transmission scheme, etc.).

For example, the wireless power transmission scheme may be based on a variety of wireless power transmission standards based on an electromagnetic induction scheme in which a magnetic field is generated in a power transmitter coil and charged using an electromagnetic induction principle in which electricity is induced in a receiver coil under the influence of its magnetic field . Here, the electromagnetic induction type wireless power transmission standard may include an electromagnetic induction wireless charging technique defined in a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA).

In another example, the wireless power transmission scheme may employ an electromagnetic resonance scheme in which the magnetic field generated by the transmission coil of the wireless power transmitter is tuned to a specific resonance frequency to transmit power to a nearby wireless power receiver . Here, the electromagnetic resonance method may include a resonance-type wireless charging technique defined in the Alliance for Wireless Power (A4WP) standard mechanism, a wireless charging technology standard mechanism.

In another example, a wireless power transmission scheme may use an RF wireless power transmission scheme that transmits power to a wireless power receiver located at a remote location by applying low-power energy to the RF signal.

On the other hand, a high-speed wireless charging technology similar to the time of wired charging using an existing cable has been proposed. However, the conventional high-speed wireless charging technology has a problem in that the high-speed charging is started and an overvoltage occurs in the transient period.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a wireless charging method and apparatus and system therefor.

It is another object of the present invention to provide a wireless charging method capable of high-speed wireless charging and an apparatus and system therefor.

It is still another object of the present invention to provide a wireless charging method and apparatus and system therefor that are capable of adaptively changing a charging mode according to the state and requirements of a wireless power receiving apparatus.

It is still another object of the present invention to provide a wireless charging method and a device and system therefor for preventing a charge-out phenomenon during high-speed wireless charging.

It is still another object of the present invention to provide a wireless charging method and a device and a system therefor, which have a wide charging area even if the charging is changed to high-speed wireless charging.

It is still another object of the present invention to provide a wireless charging method and an apparatus and system therefor for preventing overvoltage generated when controlling power based on a control error packet in high-speed wireless charging.

Still another object of the present invention is to provide stable power control in high-speed wireless charging.

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.

According to an aspect of the present invention, there is provided a wireless power transmitter including: a power transmission unit including at least one transmission coil; A power conversion unit for converting an intensity of power applied from the outside; And a control unit for controlling a charging mode and a charging power amount for the wireless power receiving apparatus, wherein the charging mode includes a first charging mode and a second charging mode, The control unit controls the charging mode to change from the first charging mode to the second charging mode based on the packet, and the control unit controls the charging power amount based on the control error packet received from the wireless power receiving apparatus, Changes the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode, Information.

Also, the wireless power transmitter according to the embodiment of the present invention can interrupt the charging power amount control based on the control error packet during the power control pause time.

In addition, the wireless power transmitter according to the embodiment may include information on the charging mode change operation frequency.

Also, in the wireless power transmitter according to the embodiment, the control error packet may include a stable control error packet.

Also, in the wireless power transmitter according to the embodiment, the charge mode packet may include information on the stable control error packet count value.

Also, a wireless power transmitter according to an embodiment may include a power transmitting unit including at least one transmitting coil; A power conversion unit for converting an intensity of power applied from the outside; And a control unit for controlling a charging mode and a charging power amount for the wireless power receiving apparatus, wherein the charging mode includes a first charging mode and a second charging mode, The control unit controls the charging mode to change from the first charging mode to the second charging mode based on the packet, and the control unit controls the charging power amount based on the control error packet received from the wireless power receiving apparatus, Changes the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode, and the charging mode packet includes information on the control error weight . ≪ / RTI >

Also, the wireless power transmitter according to the embodiment may control the charging power amount by reflecting the control error weight to the control error packet.

Also, in the wireless power transmitter according to the embodiment, the charge mode packet may include information on the control error weight applying time.

Also, the wireless power transmitter according to the embodiment may control the charging power amount by reflecting the control error weight on the control error packet during the control error weighting application time.

In addition, the wireless power transmitter according to the embodiment may include information on the charging mode change operation frequency.

In addition, the wireless power transmitter according to the embodiment may include information on the charging mode change operation frequency.

Also, in the wireless power transmitter according to the embodiment, the control error packet may include a stable control error packet.

Also, in the wireless power transmitter according to the embodiment, the charge mode packet includes information on the stable control error packet count value.

The wireless power transmission method according to an embodiment of the present invention is a wireless power transmission method for wirelessly transmitting power to a wireless power receiver, the method comprising: controlling a charging mode and a charging power for the wireless power receiving apparatus, A charging mode and a second charging mode, and controls the charging mode to change from the first charging mode to the second charging mode based on a charging mode packet received from the wireless power receiving apparatus, A method of controlling the charging power amount based on the control error packet received from the device and controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode And the charge mode packet may include information on the power control stop time.

Further, the wireless power transmission method according to the embodiment may suspend the charge power amount control based on the control error packet during the power control pause time.

Further, in the wireless power transmission method according to the embodiment, the charge mode packet may include information on the charge mode change operation frequency.

Also, in the wireless power transmission method according to the embodiment, the control error packet may include a stable control error packet.

In addition, in the wireless power transmission method according to the embodiment, the charge mode packet may include information on the stable control error packet count value.

According to another aspect of the present invention, there is provided a wireless power transmission method for wirelessly transmitting power to a wireless power receiver, the wireless power transmission method comprising: controlling a charging mode and a charging power amount for a wireless power receiving apparatus, Mode and a second charging mode and controls the charging mode to change from the first charging mode to the second charging mode based on a charging mode packet received from the wireless power receiving apparatus, And controlling the charging power based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode, And the charge mode packet may include information on the control error weight.

Also, the wireless power transmission method according to the embodiment may control the charging power amount by reflecting the control error weight to the control error packet.

Also, in the wireless power transmission method according to the embodiment, the charge mode packet may include information on the control error weight applying time.

Also, the wireless power transmission method according to the embodiment may control the charging power amount by reflecting the control error weight on the control error packet during the control error weighting application time.

Further, in the wireless power transmission method according to the embodiment, the charge mode packet may include information on the charge mode change operation frequency.

Also, in the wireless power transmission method according to the embodiment, the control error packet may include a stable control error packet.

In addition, in the wireless power transmission method according to the embodiment, the charge mode packet may include information on the stable control error packet count value.

Also, a wireless power transmitter according to an embodiment may include a power transmitting unit including at least one transmitting coil; A power conversion unit for converting an intensity of power applied from the outside; A communication unit for exchanging information with an external device; And a controller for controlling the charging mode based on the charging mode packet received through the communication unit. When the charging mode is changed from the general low-power charging mode to the fast-charging mode, a packet for power control received from the external apparatus The wireless charging power control method based on the wireless charging power control method can be changed.

Also, in the wireless power transmitter according to the embodiment, the packet for power control may include a control error packet.

In addition, the wireless power transmitter according to the embodiment may be of a full-bridge type if the charging mode is the fast charging mode.

Also, in the wireless power transmitter according to the embodiment, the charge mode packet may include a power control stop time due to the control error packet.

Also, in the wireless power transmitter according to the embodiment, the power control stop time due to the control error packet may be a time not to perform the power control based on the control error packet for a predetermined time after starting the fast charge.

Also, in a wireless power transmitter according to an embodiment, the charge mode packet may include a control error weight.

Also, in the wireless power transmitter according to the embodiment, the control error weight may be a predetermined value reflected in the control error value of the control error packet for controlling the wireless charging power.

Also, in the wireless power transmitter according to the embodiment, the control error weight may be a value of 0 or more and 1 or less.

Also, in a wireless power transmitter according to an embodiment, the charge mode packet may include a control error weight applying time.

In addition, in the wireless power transmitter according to the embodiment, the control error weight application time may be a time that reflects the control error weight to the control error value of the control error packet for a predetermined time after starting the fast charge.

Further, in the wireless power transmitter according to the embodiment, the power transmitting unit includes a plurality of transmitting coils, and a multiplexer that controls the power converted by the power converting unit to be transmitted to one of the plurality of transmitting coils .

Also, a wireless power receiver according to an embodiment includes a receiving coil; A communication unit for demodulating a signal received through the reception coil to extract a packet; And a control unit receiving the extracted packet from the communication unit to identify whether or not the external device is capable of fast charging and determining whether or not the currently performed charging mode is required to be changed. The control unit generates a predetermined charging mode packet including a charging mode value to be changed and transmits the generated charging mode packet to the external device through the communication unit, and the charging mode packet includes wireless charging power based on a packet for power control And may include a message to change the control scheme.

Also, in the wireless power receiver according to the embodiment, the packet for the power control may include a control error packet.

Also, in a wireless power receiver according to an embodiment, the charge mode packet may include a power control stop time due to a control error packet.

Also, in the wireless power receiver according to the embodiment, the power control stop time due to the control error packet may be a time not to perform the power control based on the control error packet for a predetermined time after starting the fast charge.

Further, in a wireless power receiver according to an embodiment, the charge mode packet may include a control error weight.

Also, in the wireless power receiver according to the embodiment, the control error weight may be a predetermined value reflected in the control error value of the control error packet for controlling the wireless charging power.

Also, in the wireless power receiver according to the embodiment, the control error weight may be a value of 0 or more and 1 or less.

Further, in a wireless power receiver according to an embodiment, the charge mode packet may include a control error weight applying time.

Also, in the wireless power receiver according to the embodiment, the control error weighting application time may be a time that reflects the control error weight to the control error value of the control error packet for a predetermined time after starting the fast charge.

In addition, a wireless charging method according to an embodiment includes wireless charging method in a wireless power receiver that receives power wirelessly from a wireless power transmitter, the wireless charging method comprising: collecting receiver status information in a power transmission step; Determining whether a change of the charging mode is necessary based on the collected receiver state information; And transmitting a predetermined charging mode packet including a charging mode value to be changed to the wireless power transmitter when the charging mode is to be changed as a result of the determination, Power control pause time, control error weight, and control error weight application time.

According to another aspect of the present invention, there is provided a wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless charging method comprising: receiving a packet for initial power control after a transition to a power transmission step; Transmitting a first packet indicating that the fast charge mode is supported; Receiving a first response packet from the wireless power receiver including a charging mode value; And performing charging by switching to a charging mode corresponding to the charging mode value, wherein the first response packet includes a power control stop time, a control error weight, and a control error weight applying time And may include one or more.

In the wireless charging method according to the embodiment of the present invention, the switching to the charging mode corresponding to the charging mode value and performing charging may be performed in a fast charging mode by charging the operating frequency in a fast charging mode after a predetermined time elapses .

Further, a wireless charging method according to an embodiment of the present invention is a wireless charging method in a wireless power transmitter that wirelessly transmits power to a wireless power receiver, the wireless charging method comprising: initiating charging in a fast charging mode in a power transmitting step; Stopping the power control based on the control error packet received before switching to the fast charge mode or the control error packet received after switching to the fast charge mode; Confirming whether the elapsed time from the start of the fast charge is equal to or longer than the power control stop time due to the control error packet; And initiating power control based on the control error packet received after the power control pause by the control error packet if the elapsed time is greater than or equal to the pause time.

According to another aspect of the present invention, there is provided a wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, comprising: receiving a control error packet before switching to a fast charging mode; Initiating charging in a fast charge mode in a power transfer phase; Receiving a control error packet after switching to a fast charge mode; Generating a second control error value by reflecting a control error weight on a first control error value of a control error packet received before and after switching to the fast charge mode; And controlling transmission power based on the generated second control error value.

In addition, the wireless charging method according to an embodiment of the present invention includes the steps of: confirming whether an elapsed time from the start of fast charging is equal to or greater than a control error weight application time; And if it is determined that the elapsed time is greater than or equal to the application time, the wireless power transmitter is configured to determine, based on the control error packet received prior to the control error weighting application time or the first control error value of the control error packet received after the application time And controlling the transmission power.

Effects of the wireless charging method and the apparatus and system for the same according to the present invention will be described as follows.

The present invention has the advantage of providing a wireless charging method and apparatus and system therefor.

It is also possible for the present invention to minimize charging time through high-speed wireless charging.

Further, the present invention can adaptively change the charging mode according to the state and the demand of the wireless power receiving apparatus.

In addition, the present invention prevents a charge break due to a noise current during high-speed wireless charging.

Also, since the present invention generates an alternating current signal stably and is changed to a high-speed wireless charging, the charge-out phenomenon is prevented and the charging area is wide.

In addition, the present invention can prevent an overvoltage generated during power control based on a control error packet during high-speed wireless charging.

Further, the present invention can stably control power in high-speed wireless charging.

Further, the present invention can have a wider charging area by using a plurality of transmission coils, thereby improving user convenience.

In addition, since the present invention can use only one of a plurality of identical circuits, the size of the wireless power transmitter itself can be reduced, and parts used can be reduced, thereby reducing the cost.

Further, the present invention can utilize the component elements defined in the published wireless power transmission standard, and can follow the already defined standard.

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 wireless charging system according to an embodiment.
2 is a block diagram illustrating a wireless charging system according to another embodiment.
3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment.
4 is a state transition diagram for explaining the wireless power transmission procedure defined in the WPC standard.
5 is a state transition diagram for explaining the wireless power transmission procedure defined in the PMA standard.
6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.
7 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to the FIG.
8 is a diagram for explaining a modulation and demodulation method of a wireless power signal according to an embodiment.
9 is a diagram for explaining a packet format according to a wireless power transmission procedure according to an embodiment.
FIG. 10 is a diagram for explaining the types of packets that the wireless power receiving apparatus according to the embodiment of the wireless power transmission procedure can transmit in the ping stage.
11 is a diagram for explaining a message format of an identification packet according to a wireless power transmission procedure according to an embodiment.
12 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to a wireless power transmission procedure according to an embodiment.
13 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to an embodiment.
14 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
15 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
16 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
17 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
18 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
19 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
20 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.
FIG. 21 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiving apparatus according to an embodiment of a wireless power transmission procedure; FIG.
FIG. 22 is a diagram of a charge mode state for explaining a charge mode change according to an embodiment. FIG.
23 is a diagram for explaining a wireless charging method in a wireless power receiver according to an embodiment.
24 is a diagram for explaining a wireless charging method on a wireless charging system according to an embodiment.
25 is a diagram for explaining a wireless charging method in a wireless power transmitter according to an embodiment.
26 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
27 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.
28 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
29 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
30 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.
31 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
32 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.
33 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
FIG. 34 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.
FIG. 35 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
36 is a diagram for explaining a wireless charging transmission coil according to an embodiment.
37 is a view for explaining three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils according to an embodiment.
38 is a diagram illustrating a wireless power transmitter including a plurality of coils and one drive circuit according to an embodiment.
39 is a view for explaining a plurality of switches connecting one of the plurality of transmission coils to the drive circuit according to one embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which the embodiments 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.

The present invention is not necessarily limited to these embodiments, as long as all of the constituent elements of the embodiment are described as being combined or operated together. 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 may be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing embodiments. 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.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Both below and "front EH after (rear)") are formed such that the two components are in direct contact with each other or one or more other components are disposed between the two components.

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, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power 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, a wireless charging device, and the like. For the sake of convenience, 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 Terminals and the like can be used in combination.

The wireless charging device according to the embodiment may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power may be transmitted to the device.

As an example, a wireless power transmitter can be used not only on a desk or on a table, but also developed for automobiles and used in a vehicle. A wireless power transmitter installed in a vehicle can be provided in a form of a stand that can be easily and stably fixed and mounted.

A mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, an MP3 player, The present invention can be applied to a portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, etc. However, the present invention is not limited thereto. ), And the term terminal or device can be used in combination. A wireless power receiver according to another embodiment may also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.

A wireless power receiver according to an embodiment may include at least one wireless power transmission scheme and may receive wireless power from two or more wireless power transmitters at the same time. Here, the wireless power transmission scheme may include at least one of the electromagnetic induction scheme, the electromagnetic resonance scheme, and the RF wireless power transmission scheme. In particular, the wireless power receiving means for supporting the electromagnetic induction method may include an electromagnetic induction type wireless charging technique defined by the Wireless Power Consortium (WPC) and the AirFuel Alliance (formerly PMA, Power Matters Alliance) have. In addition, the wireless power receiving means for supporting the electromagnetic resonance method may include a resonance type wireless charging technique defined in the AirFuel Alliance (formerly Alliance for Wireless Power) standard mechanism, a wireless charging technology standard organization.

Generally, a wireless power transmitter and a wireless power receiver that constitute a wireless power system can exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication. Here, the in-band communication and the BLE communication can be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, and the like. For example, the wireless power receiver can transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching on / off the current induced through the reception coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various status information including received power intensity information. At this time, the wireless power transmitter can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.

1 is a block diagram illustrating a wireless charging system according to an embodiment.

Referring to FIG. 1, the wireless charging system includes a wireless power transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission. In another example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 perform out-of-band communication in which information is exchanged using a different frequency band different from the operating frequency used for wireless power transmission .

For example, information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include control information as well as status information of each other. Here, the status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but the present invention is not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may be provided.

 For example, the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the present invention is not limited thereto, and the wireless power transmitting terminal 10 may transmit information Lt; / RTI >

In the half duplex communication mode, bidirectional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted only by any one device at any time.

The wireless power receiving terminal 20 according to an exemplary embodiment may acquire various status information of the electronic device 30. [ For example, the status information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, And is information obtainable from the electronic device 30 and available for wireless power control.

In particular, the wireless power transmitting terminal 10 according to an exemplary embodiment may transmit a predetermined packet indicating whether or not to support fast charging to the wireless power receiving terminal 20. The wireless power receiving terminal 20 can inform the electronic device 30 of the connected wireless power transmitting terminal 10 when it is confirmed that it supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.

Also, the user of the electronic device 30 may select the predetermined fast charge request button displayed on the display means to control the wireless power transmitting terminal 10 to operate in the fast charge mode. In this case, the electronic device 30 can transmit a predetermined fast charge request signal to the wireless power receiving terminal 20 when the quick charge request button is selected by the user. The wireless power receiving terminal 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the same to the wireless power transmitting terminal 10 to switch the general low power charging mode to the fast charging mode.

According to one embodiment, the electronic device 30 can be operated and switched to the fast charge mode automatically according to the communication and negotiation results of the wireless power transmitter 10 and the wireless power receiver 20, . The electronic device 30 can also be operated and switched to a general low power mode automatically according to the result of communication and negotiation between the wireless power transmitter 10 and the wireless power receiver 20 without the user's request or input.

2 is a block diagram illustrating a wireless charging system according to another embodiment.

For example, as shown in 200a, the wireless power receiving terminal 20 may include a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices may be connected to one wireless power transmitting terminal 10, Charging may also be performed. At this time, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses in a time division manner, but the present invention is not limited thereto. For example, Power can be distributed and transmitted to a plurality of wireless power receiving apparatuses using different allocated frequency bands.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus may be adjusted based on at least one of the required power amount for each wireless power receiving apparatus, the battery charging state, the power consumption amount of the electronic apparatus, It can be determined as a factor.

As another example, as shown in FIG. 200B, the radio power transmitting terminal 10 may be composed of a plurality of radio power transmitting apparatuses. In this case, the wireless power receiving terminal 20 may be connected to a plurality of wireless power transmission apparatuses at the same time, and may simultaneously receive power from connected wireless power transmission apparatuses to perform charging. At this time, the number of wireless power transmission apparatuses connected to the wireless power receiving terminal 20 is adaptively set based on the required power amount of the wireless power receiving terminal 20, the battery charging status, the power consumption amount of the electronic apparatus, Can be determined.

3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment.

As an example, the wireless power transmitter may be equipped with three transmit coils 111, 112, 113. Each transmit coil may overlap a portion of the transmit coil with a different transmit coil, and the wireless power transmitter may include a predetermined sense signal 117, 127 for sensing the presence of the wireless power receiver through each transmit coil - And sequentially transmits digital ping signals in a predefined order.

As shown in FIG. 3, the wireless power transmitter sequentially transmits the detection signal 117 through the primary sensing signal transmission procedure shown in reference numeral 110, and receives a signal strength indicator (Signal Strength Indicator 116 (or signal strength packet) may be received. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in the reference numeral 120, and the signal strength indicator 126 is transmitted to the transmission coils 111 and 112 It is possible to control the efficiency (or charging efficiency) - that is, the state of alignment between the transmitting coil and the receiving coil - to identify a good transmitting coil and to allow power to be delivered through the identified transmitting coil, .

As shown in FIG. 3, the reason why the wireless power transmitter performs the two detection signal transmission procedures is to more accurately identify to which transmission coil the reception coil of the wireless power receiver is well aligned.

If the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112 as shown in the aforementioned numerals 110 and 120 of FIG. 3, Selects a transmission coil having the best alignment based on the received signal strength indicator 126 in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil .

4 is a state transition diagram for explaining the wireless power transmission procedure defined in the WPC standard.

Referring to FIG. 4, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 410, a ping phase 420, an identification and configuration phase 430, And a power transfer phase (step 440).

The selection step 410 may be a phase transition when a specific error or a specific event is detected while initiating a power transmission or maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, in a selection step 410, the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object is placed on the interface surface, it can transition to the step 420 (S401). In the selection step 410, the transmitter transmits an analog ping signal of a very short pulse and can detect whether an object exists in the active area of the interface surface based on the current change of the transmission coil.

In step 420, the transmitter activates the receiver when an object is sensed, and transmits a digital ping to identify whether the receiver is a WPC compliant receiver. If the transmitter does not receive a response signal for the digital ping (e.g., a signal strength indicator) from the receiver in step 420, then the transmitter may transition back to the selection step 410 (S402). Also, in step 420, the transmitter may transition to a selection step 410 when receiving a signal indicating completion of power transmission from the receiver, i.e., a charging completion signal (S403).

Once the ping stage 420 is complete, the transmitter may transition to an identification and configuration step 430 to collect receiver identification and receiver configuration and status information (S404).

In the identifying and configuring step 430, the sender may determine whether the packet is unexpected, whether a desired packet is received during a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract), the process can be shifted to the selection step 410 (S405).

Once the identification and configuration for the receiver is complete, the transmitter may transition to power transfer step 440, which transmits the wireless power (S406).

In the power transfer step 440, the transmitter determines whether an unexpected packet is received, a desired packet is received for a predefined period of time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 410 can be performed (S407).

In addition, in the power transfer step 440, if the transmitter needs to reconfigure the power transfer contract according to changes in the transmitter state, etc., it may transition to the identification and configuration step 430 (S408).

The power transmission contract may be set based on the status and characteristic information of the transmitter and the receiver. For example, the transmitter status information may include information on the maximum amount of transmittable power, information on the maximum number of receivable receivers, and the receiver status information may include information on the requested power and the like.

5 is a state transition diagram for explaining the wireless power transmission procedure defined in the PMA standard.

Referring to FIG. 5, power transmission from a transmitter to a receiver according to the PMA standard is largely divided into a standby phase 510, a digital ping phase 520, an identification phase 530, A Power Transfer Phase 540, and an End of Charge Phase 550. FIG.

The waiting step 510 may be a step of performing a receiver identification procedure for power transmission or transitioning to a specific error or a specific event while sensing a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at a standby step 510, the transmitter may monitor whether an object is present on the Charging Surface. If the transmitter detects that an object has been placed on the charging surface, or if an RXID retry is in progress, the digital switching may proceed to step 520 (S501). Here, RXID is a unique identifier assigned to a PMA compatible receiver. At the standby step 510, the transmitter transmits an analog ping of a very short pulse and, based on the change in current of the transmitting coil, causes the object to move to the active surface of the interface surface-for example, It can be detected whether or not it exists.

The transmitter transited to the digital pinging step 520 sends a digital finger signal to identify whether the sensed object is a PMA compatible receiver. When sufficient power is supplied to the receiver by the digital ping signal transmitted by the transmitter, the receiver can modulate the received digital ping signal according to the PMA communication protocol and transmit a predetermined response signal to the transmitter. Here, the response signal may include a signal strength indicator indicating the strength of the power received at the receiver. At step 520, the transmitter may transition to the identifying step 530 if a valid response signal is received (S502).

If the response signal is not received or it is determined that it is not a PMA compliant receiver, i.e., it is a Foreign Object Detection (FOD), at step 520, the transmitter can transition to the wait step 510 (S503). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 530, the transmitter may transition to the wait step 510 if the receiver identification procedure fails or the receiver identification procedure must be re-performed and the receiver identification procedure has not been completed for a predefined period of time S504).

If the transmitter succeeds in identifying the receiver, the transmitter may transition from the identifying step 530 to the power transfer step 540 and start charging (S505).

In the power transfer step 540, the transmitter determines if the desired signal is not received within a predetermined time (Time Out), an FO is detected, or if the voltage of the transmit coil exceeds a predefined reference value, (S506).

Also, in the power transmission step 540, if the temperature sensed by the temperature sensor provided inside the transmitter exceeds a predetermined reference value, the transmitter may transition to the completion of charging step 550 (S507).

In the charge completion step 550, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter can transition to the standby state 510 (S509).

If the measured temperature drops below the reference value in the over temperature state, the transmitter may transition from the charging completion step 550 to the digital charging step 520 in step S510.

In the digital ping phase 520 or the power transfer phase 540, the transmitter may transition to the charge completion phase 550 (S508 and S511) when an End Of Charge (EOC) request is received from the receiver.

6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.

6, the wireless power transmitter 600 may include a power conversion unit 610, a power transmission unit 620, a communication unit 630, a control unit 640, and a sensing unit 650 . It should be noted that the configuration of the wireless power transmitter 600 described above is not necessarily an essential configuration, and may be configured to include more or less components.

As shown in FIG. 6, when power is supplied from the power supply unit 660, the power conversion unit 610 may convert the power to a predetermined intensity.

For this, the power conversion unit 610 may include a DC / DC conversion unit 611 and an amplifier 612.

The DC / DC converting unit 611 may convert DC power supplied from the power supply unit 660 into DC power having a specific intensity according to a control signal of the controller 640.

At this time, the sensing unit 650 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the controller 640. In addition, the sensing unit 650 may measure the internal temperature of the wireless power transmitter 600 and may provide the measurement result to the controller 640 in order to determine whether overheating occurs. For example, the control unit 640 may adaptively cut off the power supply from the power supply unit 650 or block the supply of power to the amplifier 612 based on the voltage / current value measured by the sensing unit 650 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 610 to cut off power supplied from the power supply unit 650 or to cut off power supplied to the amplifier 612.

The amplifier 612 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 640. For example, the control unit 640 may receive the power reception status information and / or the power control signal of the wireless power receiver through the communication unit 630 and may receive the power control information based on the received power reception status information and / So that the amplification factor of the amplifier 612 can be dynamically adjusted. For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmitting unit 620 may be configured to include a multiplexer 621 (or a multiplexer), a transmitting coil 622, and the like. In addition, the power transmitting unit 620 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 612 delivered via the multiplexer 621 to AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output of the multiplexer 621 to generate AC power. However, this is only an example, It should be noted that they may be mixed only or later.

The frequency of the AC power transmitted to each of the transmission coils according to the embodiment may be different from each other, and another embodiment may be implemented by using a predetermined frequency controller having a function of adjusting the LC resonance characteristic for each transmission coil differently It is also possible to set different resonance frequencies for the respective transmission coils.

However, when the resonant frequencies generated in each of the plurality of transmission coils are different, a separate frequency controller for controlling the resonant frequencies is required, which may increase the size of the wireless power transmitter. Accordingly, in one embodiment, The case where power is transmitted using the same resonance frequency will be described with reference to FIG. 41 to FIG.

6, the power transmission unit 620 includes a multiplexer 621 and a plurality of transmission coils 622 for controlling the output power of the amplifier 612 to be transmitted to the transmission coil, that is, Th to n < th > transmit coils.

The controller 640 according to an embodiment may transmit power by time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected. For example, if the wireless power transmitter 600 has three wireless power receivers-i. E., The first through third wireless power receivers, respectively, identified through three different transmit coils, i. E., First through third transmit coils , The controller 640 controls the multiplexer 621 so that power can be transmitted through a specific transmission coil in a specific time slot. At this time, the amount of power transmitted to the corresponding wireless power receiver can be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. The power of the amplifier 612 may be controlled to control the transmission power of each wireless power receiver.

The control unit 640 may control the multiplexer 621 so that the detection signals may be sequentially transmitted through the first through n'th transmission coils 622 during the first detection signal transmission procedure. At this time, the control unit 640 can identify the time at which the sensing signal is transmitted using the timer 655. When the sensing signal transmission time arrives, the control unit 640 controls the multiplexer 621 to output a sensing signal It can be controlled to be transmitted. For example, the timer 650 can send a specific event signal to the control unit 640 at predetermined intervals during the ping transmission step. When the event signal is detected, the control unit 640 controls the multiplexer 621 to transmit the corresponding event signal It is possible to control the digital ping to be transmitted through the coil.

In addition, the control unit 640 may transmit a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 632 during the first detection signal transmission procedure, Lt; / RTI > received signal strength indicator. In the second sensing signal sending process, the controller 640 controls the multiplexer 621 so that the sensing signal can be transmitted only through the transmitting coil (s) on which the signal strength indicator is received during the first sensing signal sending procedure You may. In another example, when there are a plurality of transmit coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 640 transmits the received transmit coil with the signal strength indicator having the largest value as the second differential sense signal In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 621 may be controlled according to the determination result.

The modulator 631 may modulate the control signal generated by the controller 640 and transmit the modulated control signal to the multiplexer 621. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 632 can demodulate the detected signal and transmit the demodulated signal to the controller 640 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

Also, the demodulator 632 can identify which of the transmit coils the demodulated signal is received, and provide the control unit 640 with a predetermined transmit coil identifier corresponding to the identified transmit coil.

 In one example, the wireless power transmitter 600 may obtain the signal strength indicator through in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 600 can transmit wireless power using the transmit coil 622, as well as exchange various information with the wireless power receiver via the transmit coil 622. As another example, the wireless power transmitter 600 may further include a separate coil corresponding to each of the transmission coils 622 (i.e., the first to n < th > transmission coils) It should be noted that it may also perform in-band communication with the receiver.

Although the wireless power transmitter 600 and the wireless power receiver perform in-band communication in the description of FIG. 6, this is merely an example, and the frequency band used for the wireless power signal transmission Directional communication through different frequency bands. For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

In particular, the wireless power transmitter 600 according to one embodiment may adaptively provide a fast charge mode and a general low power charge mode at the request of the wireless power receiver.

The wireless power transmitter 600 can transmit a signal of a predetermined pattern, which is called a first packet for convenience of explanation, when the fast charge mode is supported. The wireless power receiver can identify when the first packet is received that the wireless power transmitter 600 being connected is capable of fast charging.

In particular, the wireless power receiver may send a first response packet to the wireless power transmitter 600 requesting fast charging if fast charging is required.

In particular, the wireless power transmitter 600 may automatically switch to the fast charge mode and initiate a fast charge when a predetermined time elapses after receiving the first response packet. Also, when the state of the wireless charging is stabilized after receiving the first response packet, the wireless power transmitter 600 can automatically switch to the fast charging mode and start the fast charging. Also, when the wireless power transmitter 600 receives the first response packet and receives the predetermined control error packet, the wireless power transmitter 600 can automatically switch to the fast charge mode and start the fast charge.

For example, when the control unit 640 of the wireless power transmitter 600 transits to the power transmission step 440 or 540 of FIGS. 4 through 5, the control unit 640 controls the first packet to be transmitted through the transmission coil 622 However, this is only one example, and another example of the present invention may be the first packet sent out in the identification and configuration step 430 of FIG. 4 or the identifying step 530 of FIG.

It should be noted that another embodiment may transmit encoded information that can identify whether or not fast charge support is available to the digital ping signal transmitted by the wireless power transmitter 600. [

The wireless power receiver may send a predetermined charge mode packet to the wireless power transmitter 600 where the charge mode is set to fast charge if a fast charge is needed at any point in the power transfer phase. For example, the wireless power transmitter 600 and the wireless power receiver can control the internal operation so that power corresponding to the fast charge mode can be sent and received when the charge mode is changed to the fast charge mode. For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the overvoltage determination criterion, the over temperature criterion, the low-voltage / high- Level (Optimum Voltage Level), power control offset, and the like can be changed and set. Further, when the charging mode is changed from the normal low-power charging mode to the fast charging mode, the wireless power transmitter 600 can be changed to the wireless charging method in the power control based on the control error packet received from the wireless power receiver. Here, the detailed configuration of the charge mode packet will be made more clear through the explanation of FIGS. 13 to 20 to be described later.

For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the threshold voltage for determining the overvoltage may be set to be high enough to enable fast charging. As another example, the critical temperature for determining whether overheating occurs may be set high considering the temperature rise due to fast charging. As another example, the power control offset value, which means the minimum level at which the power at the transmitter is controlled, may be set to a larger value than the general low-power charging mode so that it can converge quickly to the desired target power level in the fast-charge mode.

7 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to the FIG.

7, the wireless power receiver 700 includes a receiving coil 710, a rectifier 720, a DC / DC converter 730, a load 740, a sensing unit 750, 760, and a main control unit 770. Here, the communication unit 760 may include at least one of a demodulation unit 761 and a modulation unit 762.

Although the wireless power receiver 700 shown in the example of FIG. 7 is shown as being capable of exchanging information with the wireless power transmitter 600 through in-band communication, this is only one embodiment, The communication unit 760 according to the embodiment may provide near-end bi-directional communication through a frequency band different from the frequency band used for the transmission of the wireless power signal.

AC power received through the receive coil 710 may be delivered to the rectifier 720. The rectifier 720 may convert the AC power to DC power and transmit it to the DC / DC converter 730. [ The DC / DC converter 730 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 740 and then forward it to the load 740. The receiving coil 710 may also include a plurality of receiving coils (not shown), i.e., first to n-th receiving coils. The frequency of the AC power transmitted to each of the reception coils (not shown) according to an embodiment may be different from each other, and another embodiment may include a predetermined frequency controller having a function of adjusting LC resonance characteristics for different reception coils The resonance frequencies of the respective receiving coils can be set differently.

The sensing unit 750 may measure the intensity of the DC power output from the rectifier 720 and provide it to the main control unit 770. Also, the sensing unit 750 may measure the intensity of the current applied to the reception coil 710 according to the wireless power reception, and may transmit the measurement result to the main control unit 770. The sensing unit 750 may measure the internal temperature of the wireless power receiver 700 and provide the measured temperature value to the main control unit 770.

For example, the main control unit 770 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred can be generated and transmitted to the modulating unit 762. Here, the signal modulated by the modulating unit 762 may be transmitted to the wireless power transmitter through the receiving coil 710 or a separate coil (not shown). The main control unit 770 may determine that the detection signal is received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value and when the signal strength indicator corresponding to the detection signal is received by the modulation unit 762 To be transmitted to the wireless power transmitter. The demodulation unit 761 demodulates the AC power signal between the reception coil 710 and the rectifier 720 or the DC power signal output from the rectifier 720 to identify whether or not the detection signal is received, (770). At this time, the main control unit 770 may control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulation unit 762. [

The main control unit 770 may also determine whether the connected radio power transmitter is a wireless power transmitter capable of fast charging based on the information demodulated by the demodulator 760. [

Also, the main control unit 770 generates a charge mode packet corresponding to the received fast charge request signal when a predetermined fast charge request signal for requesting fast charge is received from the electronic device 30 of FIG. 1, (761). Here, the fast charge request signal from the electronic device can be received according to the user menu selection on the predetermined user interface.

Also, when it is confirmed that the connected wireless power transmitter supports the fast charging mode, the main control unit 770 automatically requests the wireless power transmitter to fast charge based on the battery remaining amount or the wireless power transmitter stops the fast charging It may be controlled to switch to a general low-power charging mode.

Also, the main control unit 770 may monitor the power consumption of the electric device during charging to the general low-power charging mode in real time. If the power consumption of the electronic device is equal to or greater than a predetermined reference value, the main control unit 770 may generate a predetermined charging mode packet requesting switching to the fast charging mode and transmit the generated charging mode packet to the modulation unit 761. [

The main control unit 770 may compare the internal temperature measured by the sensing unit 750 with a predetermined reference value to determine whether overheating occurs. If overheating occurs during the fast charging, the main control unit 770 may generate and transmit a charging mode packet so that the wireless power transmitter is switched to a general low power charging mode.

Also, the main control unit 770 determines whether it is necessary to change the charging mode based on at least one of the battery charging rate, the internal temperature, the intensity of the rectifier output voltage, the CPU usage rate mounted on the electronic equipment, As a result of the determination, if it is necessary to change the charging mode, a charging mode packet including the charging mode value to be changed may be generated and transmitted to the wireless power transmitter.

8 is a diagram for explaining a modulation and demodulation method of a wireless power signal according to an embodiment.

As shown in FIG. 8, the wireless power transmitter 10 and the wireless power receiver 20 can encode or decode a packet to be transmitted based on an internal clock having the same period.

Hereinafter, a method of encoding a packet to be transmitted will be described in detail with reference to FIGS. 1 to 8. FIG.

Referring to FIG. 1, when the wireless power transmitter 10 or the wireless power receiver 20 does not transmit a specific packet, the wireless power signal is modulated with modulation having a specific frequency, May be an alternating current signal. On the other hand, when the wireless power transmitting terminal 10 or the wireless power receiving terminal 20 transmits a specific packet, the wireless power signal may be an alternating signal modulated by a specific modulation method, as shown in FIG. For example, the modulation scheme may include, but is not limited to, an amplitude modulation scheme, a frequency modulation scheme, a frequency and amplitude modulation scheme, a phase modulation scheme, and the like.

The binary data of the packet generated by the wireless power transmitting terminal 10 or the wireless power receiving terminal 20 may be subjected to differential bi-phase encoding as shown in 820. [ Specifically, the differential two-stage encoding has two state transitions to encode data bit one and one state transition to encode data bit zero. That is, the data bit 1 is encoded such that the transition between the HI state and the LO state occurs at the rising edge and the falling edge of the clock signal, and the data bit 0 is at the rising edge of HI State and the LO state may be encoded to occur.

The encoded binary data may be subjected to a byte encoding scheme, as shown in FIG. Referring to reference numeral 830, a byte encoding method according to an embodiment of the present invention includes a start bit and a stop bit for identifying a start and a type of a bitstream of an 8-bit encoded binary bitstream, , And a parity bit for detecting whether or not an error has occurred in the bitstream (byte).

9 is a diagram for explaining a packet format according to an embodiment.

9, a packet format 900 used for information exchange between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 includes a function of acquiring synchronization for demodulating the packet and identifying an accurate start bit of the packet A header 920 for identifying a type of a message included in the packet, a message for transmitting the content of the packet (or a payload), a preamble field 910 for transmitting the packet, 930) field and a checksum (940) field for identifying whether an error has occurred in the packet.

As shown in FIG. 9, the packet receiving end may identify the size of the message 930 included in the packet based on the header 920 value.

In addition, the header 920 may be defined for each step of the wireless power transmission procedure, and some of the header 920 values may be defined as different types of messages although they are the same value at different stages. For example, referring to FIG. 9, it should be noted that the header value corresponding to the end power transfer in the ping phase and the power transmission phase in the power transfer phase may be equal to 0x02.

The message 930 includes data to be transmitted at the transmitting end of the packet. For example, the data contained in the message 930 field may be, but is not limited to, a report, request or response to the other party.

The packet 900 according to another exemplary embodiment may further include at least one of a transmitting end identification information for identifying a transmitting end that transmitted the packet and a receiving end identifying information for identifying a receiving end to receive the packet. Here, the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like. However, the present invention is not limited thereto.

The packet 900 according to another embodiment may further include predetermined group identification information for identifying a corresponding receiving group when the packet is to be received by a plurality of apparatuses.

10 is a view for explaining the types of packets that the wireless power receiving apparatus according to an embodiment can transmit in the ping step.

As shown in FIG. 10, in the step of pinging, the wireless power receiving apparatus can transmit a signal strength packet or a power transmission stop packet.

Referring to reference numeral 1001 in FIG. 10, a message format of a signal strength packet according to an exemplary embodiment may be composed of a signal strength value having a size of 1 byte. The signal strength value may indicate the degree of coupling between the transmitting coil and the receiving coil and may be calculated based on the rectifier output voltage in the digital ping section, the open circuit voltage measured in the output blocking switch, Lt; / RTI > The signal strength value may range from a minimum of 0 to a maximum of 255 and may have a value of 255 if the actual measured value for a particular variable is equal to the maximum value of that variable (Umax).

For example, the signal strength value may be calculated as U / Umax * 256.

Referring to FIG. 10, the message format of the power transmission stop packet according to an exemplary embodiment may include an end power transfer code having a size of 1 byte.

The reasons why the wireless power receiving apparatus requests the wireless power transmitter to stop the power transmission include charging completion, internal fault, overtemperature, overvoltage, overcurrent, battery But is not limited to, battery failure, reconfiguration and no response, noise current, and the like. It should be noted that the power transmission interruption code may be further defined in response to each new power transmission interruption reason.

Charging complete can be used to indicate that the charging of the receiver battery is complete. Internal errors can be used when a software or logical error in the internal operation of the receiver is detected.

Overheating / overvoltage / overcurrent can be used when the measured temperature / voltage / current value at the receiver exceeds the defined threshold for each.

Battery damage can be used if it is determined that there is a problem with the receiver battery.

Reconfiguration can be used when renegotiation is required for power transmission conditions.

No response can be used if the transmitter's response to the control error packet - meaning increasing or decreasing the strength of the power - is judged to be unhealthy.

The noise current, which is different from the overcurrent, can be used when the noise current value measured at the receiver exceeds the defined threshold value due to switching noise in the inverter.

11 is a diagram for explaining a message format of an identification packet according to an embodiment.

11, the message format of the identification packet includes a Version Information field, a Manufacturer Information field, an Extension Indicator field, and a Basic Device Identification Information field Lt; / RTI >

In the version information field, revision version information of a standard applied to the wireless power receiving apparatus can be recorded.

In the manufacturer information field, a predetermined identification code for identifying the manufacturer of the wireless power receiving apparatus may be recorded.

The extension indicator field may be an indicator for identifying whether an extended identification packet including the extended device identification information exists. For example, if the value of the extension indicator is 0, it means that there is no extension identification packet, and if the extension indicator value is 1, it means that the extension identification packet exists after the identification packet.

Referring to reference numerals 1101 to 1102, if the extension indicator value is 0, the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information and basic device identification information. On the other hand, if the extension indicator value is 1, the device identifier for the wireless power receiver may be a combination of manufacturer information, basic device identification information, and extended device identification information.

12 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to an embodiment.

12, the message format of the configuration packet may have a length of 5 bytes and may include a power class field, a maximum power field, a power control field, A count field, a window size field, a window offset field, and the like.

The power rating field may record the power rating assigned to the wireless power receiver.

The maximum power field may record the intensity value of the maximum power that can be provided at the rectifier output of the wireless power receiver.

For example, when the power level is a and the maximum power is b, the maximum power amount Pmax desired to be provided at the rectifier output of the wireless power receiving apparatus can be calculated as (b / 2) * 10a.

The power control field can be used to indicate which algorithm should be used to control the power in the wireless power transmitter. For example, if the power control field value is 0, it implies applying the power control algorithm defined in the standard, and if the power control field value is 1, it means that the power control is performed according to the algorithm defined by the manufacturer.

The count field may be used to record the number of option configuration packets that the wireless power receiving device will send in the identification and configuration phase.

The window size field may be used to record the window size for calculating the average received power. As an example, the window size may be a positive integer value that is greater than zero and has a unit of 4 ms.

In the window offset field, information for identifying the time from the end of the average reception power calculation window to the transmission start point of the next received power packet may be recorded. In one example, the window offset may be a positive integer value greater than zero and in units of 4 ms.

Referring to reference numeral 1202, the message format of the power control hold packet may be configured to include a power control hold time (T_delay). A plurality of power control hold packets may be transmitted during the identification and configuration phase. For example, up to seven power control pending packets may be transmitted. The power control hold time (T_delay) may have a value between a predefined power control hold minimum time (T_min: 5 ms) and a power control hold maximum time (T_max: 205 ms). The wireless power transmission apparatus can perform power control using the power control retention time of the power control retention packet last received in the identification and configuration step. Also, the wireless power transmission apparatus can use the T_min value as the T_delay value when the power control hold packet is not received in the identification and configuration step.

The power control retention time may refer to the time that the wireless power transmission apparatus should wait without performing the power control before performing the actual power control after receiving the latest control error packet.

13 is a diagram illustrating a structure of a charge mode packet for requesting a charge mode change according to an embodiment.

Referring to FIG. 13, the header value of the charge mode packet may be one of the undefined values of the packet header values defined in the current wireless charge standard. For example, the header value of the charge mode packet may be defined as 0x18, as shown in FIG. 9, but it should be noted that this is not necessarily the value for convenience of explanation.

The message size corresponding to the header value 0x18 may be one byte.

Information on the charging mode to be changed may be recorded in the message field of the charging mode packet. For example, referring to reference numeral 1350, when a change to a fast charge mode is required in a normal low power charge mode, the wireless power receiver may transmit 0xff in the message field of the charge mode packet. On the other hand, when the fast power charging mode requires changing to the normal low power charging mode during charging, the wireless power receiver can transmit 0x00 in the message field of the charging mode packet and transmit it. The example shown in FIG. 1350 is intended to facilitate understanding of the present invention, but the message value is not necessarily so defined.

14 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to another embodiment.

As shown in FIG. 14, the message field of the charge mode packet may be configured to include a charge mode 1431 and a requested power 1432. Here, the requested power may be a value of the initial power required for changing to the charging mode.

The size of the message of the recharge mode packet is one byte, and some of the one byte may be used for charging mode 1431 and the remaining bits for request power 1432. In one example, b7 to b4 are used for transmission in the charging mode 1431, and b3 to b0 can be used for transmission of the required power 1432. In this case, the range of message values 0x00 to 0x0f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode and 0x10 to 0x1f is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

15 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to another embodiment.

As shown in FIG. 15, the message field of the charge mode packet may be configured to include a charge mode 1531 and a charge mode change wait time 1532. Here, the charging mode change waiting time 1532 may mean a time for which the wireless power transmitter waits until the charging mode is changed after receiving the charging mode packet. For example, if the value of the charging mode change waiting time 1532 is zero, it may mean immediately changing the charging mode. That is, the greater the charging mode change waiting time 1532, the longer the time required to change the charging mode. A wireless charging system in accordance with another embodiment may use the charging mode change wait time 1532 to synchronize the charging mode switching time between the wireless power transmitter and the wireless power receiver.

For example, as shown in reference numeral 1550, b7, which is the MSB (Most Significant Bit) of the message field, may be a bit for identifying a charging mode to be switched. The remaining b6 to b0 may be used for setting the charging mode change wait time 1532. [ In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

16 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to another embodiment.

As shown in FIG. 16, the message field of the charge mode packet may be configured to include a charge mode 1631 and a charge mode change operation frequency 1632. Here, the charging mode changing operation frequency 1632 may mean an operating frequency for generating the AC signal at a predetermined frequency after the wireless power transmitter changes to the fast charging mode by receiving the charging mode packet. Also, the charge mode change operating frequency 1632 can be preset. That is, the wireless power transmitter may generate an alternating current signal at a predetermined operating frequency 1632 in the fast charge mode. For example, the charge mode change operating frequency 1632 may be an operating frequency that a user has stored in advance in a memory (not shown). In this case, the charge mode change operating frequency 1632 may be an operating frequency that produces a stable alternating current signal as a result of the test. More specifically, the charge mode change operating frequency 1632 may be 120 kHz. As another example, the charging mode change operating frequency 1632 may be an operating frequency that stores the operating frequency at which the AC signal was stably generated in the fast charge mode before resuming wireless charging, in a memory (not shown) or the like.

For example, as shown in reference numeral 1650, b7, which is the most significant bit (MSB) among the message fields, may be a bit for identifying a charging mode to be switched. The remaining b6 to b0 may be used for setting the charge mode change operating frequency 1632. [ In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

17 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to another embodiment.

As shown in FIG. 17, the message field of the charge mode packet may be configured to include a charge mode 1731 and a charge mode change stable control error packet count value 1732. Here, the stable control error packet may be a control error packet (CEP) having a control error value of 0, which may be a state in which the transmission power of the wireless power transmission apparatus need not be lowered or raised, and a more detailed description will be given later. The recharge mode changeover control error packet count value 1732 may be a count value that changes the charge mode when the wireless power transmitter receives a predetermined number of control packets or more than a predetermined number of consecutive stable control error packets after receiving the corresponding charge mode packet . That is, it may be determined that the wireless power transmitter is stably generating an alternating current signal with the charging mode changeable control error packet count value 1732. For example, if the recharge mode changeable control error packet count value 1732 is 3, it may mean that the wireless power transmitter changes the charge mode if three or more consecutive stable control error packets are received. That is, the larger the count value 1732 of the change-in-charge-mode-change-control-error-error packet, the more stable control error packets must be continuously received in order to change the charge mode.

For example, as shown in reference numeral 1750, b7, which is the most significant bit (MSB) of the message field, may be a bit for identifying a charging mode to be switched. The rest b6 to b0 may be used for setting the charge mode change stable control error packet count value 1732. [ In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

18 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.

As shown in FIG. 18, the message field of the charging mode packet may include a charging mode 1831 and a power control suspension time 1832 by a control error packet (CEP). Here, the power control suspension time 1832 by the control error packet (CEP) does not control the power based on the control error packet for a predetermined time after the wireless power transmitter starts the fast charge when receiving the corresponding charge mode packet It can mean time. More specifically, when receiving a corresponding charge mode packet having a predetermined time, the wireless power transmitter transmits a control error packet received before the fast charge mode switch or a control error packet received after switching the fast charge mode for the predetermined time And control the wireless charging power based on the control error packet received after the predetermined time. For example, when the value of the power control suspension time 1832 due to the control error packet (CEP) is 0, the wireless power transmitter can immediately switch to the fast charge mode, The power can be controlled based on the control error packet received after the switching. Also, the greater the power control pause time 1832 due to the control error packet (CEP), the more the wireless power transmitter will have to wait for the time to ignore the control error packet received before the fast charge mode switch or the control error packet received after the fast charge mode switch This can mean longer.

For example, as shown in reference numeral 1850, b7, which is the MSB (Most Significant Bit) of the message field, may be a bit for identifying a charging mode to be switched. The remaining b6 to b0 may be used for setting the power control pause time 1832 by the control error packet (CEP). In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

19 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.

As shown in FIG. 19, the message field of the charge mode packet may be configured to include a charge mode 1931 and a control error weight 1932. Here, the control error weight 1932 may mean a predetermined value reflected in the control error value of the control error packet for controlling the wireless charging power when the wireless power transmitter receives the corresponding charging mode packet. More specifically, the wireless power transmitter may receive a corresponding charge mode packet having a predetermined value, and the control error weight in the normal low power charge mode may be the same as the control error weight in the fast charge mode, have. For example, if the control error weights in the normal low-power charge mode and the fast-charge mode are the same, the wireless power transmitter will transmit the wireless charge power at the same level or the same level, based on the control error value of the control error packet, Can be controlled. If there is a difference between the control error weights in the normal low-power charging mode and the fast-charging mode, the wireless power transmitter will have different control error weights reflected in the control error value of the control error packet when the charging mode is switched. Level or other steps to control the wireless charging power. More specifically, the control error weight may be a value between 0 and 1 inclusive. For example, when the control error weight is 1, the wireless power transmitter can control the power for wireless charging by directly using the control error value of the received control error packet. If the control error weight is greater than 0 and less than 1, the wireless power transmitter generates the control error value of the received control error packet as a lower level control error value and uses the control error value that reflects the weight Can be controlled. In this case, the wireless power transmitter may control the wireless charging power at a level or step lower than the power control level or level required by the wireless power receiver. If the control error weight is 0, the wireless power transmitter may determine that the control error value of the received control error packet is all 0, and increase or decrease the wireless charging power amount. That is, in this case, the wireless power transmitter can determine all control error packets as stable control error packets. In addition, the control error weight is not limited to the above example, and may be a value larger than 1 or smaller than 0 as needed.

For example, as shown in reference numeral 1950, b7, which is the Most Significant Bit (MSB) among the message fields, may be a bit for identifying a charging mode to be switched. The remaining b6 to b0 may be used for setting the control error weights 1932. In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

20 is a diagram for explaining a structure of a charge mode packet for requesting a charge mode change according to a wireless power transfer procedure according to another embodiment.

As shown in FIG. 20, the message field of the charge mode packet may be configured to include a charge mode 1831, a control error weighting time 2032, and a control error weight 2033. The control error weighting 2033 may have the same meaning as the control error weighting 1932 described in FIG. The control error weighting application time 2032 is a time that reflects the control error weight value 1932 to the control error value of the control error packet for a predetermined time after the wireless power transmitter receives the corresponding charge mode packet It can mean. More specifically, when receiving a corresponding charging mode packet having a predetermined time and a predetermined value, the wireless power transmitter transmits a control error packet received before switching to the fast charging mode or a control error packet received after switching to the fast charging mode The wireless charging power can be controlled by reflecting a predetermined value in the control error value of the control error packet. For example, if the control error weighting time 2032 is zero, the wireless power transmitter may control the wireless charging power without reflecting the control error weight 2033 on the control error value of the control error packet. As the control error weighting application time 2032 increases, the wireless power transmitter increases the control error value of the control error packet received after switching to the fast charge mode or the control error packet received after the fast charge mode switch, It may mean that the time for applying the time stamp 2033 is longer.

For example, as shown in reference numeral 2050, b7, which is the MSB (Most Significant Bit) of the message field, may be a bit for identifying a charging mode to be switched. Also, b6 to b4 can be used for setting the control error weighting time 2032. [ Also, b3 to b0 may be used for setting the control error weights 2033. In this case, the range of message values 0x00 to 0x7f is used as a value for requesting the switch from the first charge mode to the general low power charge mode in the fast charge mode, and 0x80 to 0xff is used as the second charge mode - that is, Can be used as a value for requesting switching from the low power charging mode to the fast charging mode. It should be noted that the above example is only one example and that the construction and definition of the message field may be discussed in accordance with the practitioner's implementation.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

21 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiving apparatus according to an embodiment.

Referring to FIG. 21, in a power transmission step, a packet that can be transmitted by a wireless power receiving apparatus includes a control error packet (CEP), an end power transfer packet, a received power packet, A Charge Status Packet, a packet defined by the manufacturer, and the like.

Reference numeral 2101 denotes a message format of a control error packet composed of a 1-byte control error value. Here, the control error value may be an integer value ranging from -128 to +127. If the control error value is negative, the transmission power of the radio power transmission apparatus decreases, and if it is positive, the transmission power of the radio power transmission apparatus can be increased. If the control error value is 0, the output power of the wireless power transmitting apparatus may be increased or decreased. In particular, a control error packet (CEP) with a control error value of zero may be referred to as a stable control error packet.

Reference numeral 2102 denotes a message format of an End Power Transfer Packet composed of a 1-byte End Power Transfer Code.

Reference numeral 2103 denotes a received power packet of a received power packet including a 1-byte received power value. Here, the received power value may correspond to the average rectifier received power value calculated during a predetermined period. The actual received power amount Preceived can be calculated based on the maximum power and the power class included in the configuration packet 1201. [ As an example, the actual amount of power received can be calculated by (received power value / 128) * (maximum power / 2) * (10 power rating).

Reference numeral 2104 denotes a message format of a Charge Status Packet consisting of a 1-byte Charge Status Value. The charge state value may indicate the battery charge amount of the wireless power receiving device. For example, the charge state value 0 means a completely discharged state, the charge state value 50 may mean a 50% charge state, and the charge state value 100 may mean a full charge state. If the wireless power receiving device does not include a rechargeable battery or can not provide charge state information, the charge state value may be set to OxFF.

FIG. 22 is a diagram of a charge mode state for explaining a charge mode change according to an embodiment. FIG.

Referring to FIG. 22, the power transmission steps 440 and 540 shown in FIGS. 4 and 5 may include a first charging mode 2210 in which general low-power charging is performed and a second charging mode 2220 in which fast charging is performed. have.

The first charging mode 2210 and the second charging mode 2220 can be switched to each other when a predetermined condition is satisfied. In one example, the wireless power receiver may cause the wireless power transmitter to switch to the second charging mode 2220 when receiving a request to switch from the electronic device to the second charging mode 2220 during charging in the first charging mode 2210 The charging mode can be changed by transmitting a predetermined packet. In another example, the wireless power receiver may also send a predetermined packet to the wireless power transmitter requesting a switch to the first charging mode 2210 when the battery charge level reaches a predetermined threshold during charging to the second charging mode 2220 have.

A wireless power transmitter in accordance with another embodiment may send power to a plurality of wireless power receivers. In this case, if the wireless power receiver is newly connected or disconnected from the existing wireless power receiver, it may perform the power redistribution procedure for the currently connected wireless power receiver (s). If the power redistribution results in no longer providing a fast charge to the wireless power receiver being charged in the second charging mode, the wireless power transmitter transmits to the wireless power receiver a second charging mode (2220) 2210 in order to transmit the packet.

In the above embodiment, the charging mode is divided into the first charging mode 2210 and the second charging mode 2220. However, this is only one embodiment, and a new charging mode , Not shown) may be defined and added. For example, the second charging mode 2220 for fast charging may be subdivided into an intermediate power fast charging mode (not shown) and a high power fast charging mode (not shown). For example, an intermediate power fast charge mode (not shown) can deliver an average of 9W of power. The high power fast charge mode (not shown) can deliver an average of 15W of power. The present invention is not limited to the above example, and the intermediate power fast charge mode (not shown) and the high power fast charge mode (not shown) may be defined in other meanings.

The initial charging mode according to one embodiment may be determined through state information exchange or negotiation between the wireless power transmitter and the wireless power receiver in the identifying and configuring step 430 of FIG. 4 or the identifying step 530 of FIG. 5 It is possible.

For example, in the identifying and configuring step 430 of FIG. 4 or the identifying step 530 of FIG. 5, the wireless power transmitter may transmit predetermined information to identify whether it is a device capable of fast charge mode support, To the receiver. At this time, the wireless power receiver can transmit a predetermined packet requesting fast charging to the wireless power transmitter when the wireless power receiver is a device capable of high-speed charging and the battery charging amount is less than a predetermined reference value. When the wireless power transmitter normally enters the power transmission step, it can switch to the fast charge mode at the request of the wireless power receiver to perform wireless charging.

The initial charging mode according to another embodiment may be determined in the power transmission step. As an example, the wireless power transmitter may enter a power transfer phase and transmit a first power control request packet (e.g., but not limited to a Control Error Packet defined in the WPC standard) It is possible to transmit a first packet for identifying whether to support charging. When the wireless power receiver receives the first packet and it is confirmed that the connected wireless power transmitter supports fast charging, it determines whether the fast charging is started, and transmits a predetermined first response packet including the determination result to the wireless power transmitter . That is, the initial charge mode may be determined based on the first response packet.

23 is a diagram for explaining a wireless charging method in a wireless power receiver according to an embodiment.

Referring to FIG. 23, when the wireless power receiver enters the power transmission step, it can collect its own status information (i.e., receiver status information) (S2301).

The wireless power receiver may determine whether a charge mode change is required based on the collected receiver state information (S2303 to S2305).

In one example, the receiver status information may include battery charge status information. If the battery charge amount during charging falls below a predetermined reference value in the general low power charging mode, the wireless power receiver may determine that switching to the fast charging mode is necessary.

 In another example, the receiver status information may include information about CPU usage. If the power consumption of the wireless power receiver rapidly increases due to the CPU usage exceeding a predetermined reference value during charging in the general low power charging mode, the wireless power receiver may determine that switching to the fast charging mode is necessary.

In another example, the receiver status information may include application software and peripheral status information. For example, if the number of currently running application software exceeds a predetermined threshold value, the wireless power receiver may determine that a switch to a fast charge mode is required. For example, the peripheral device status information may include camera driving status information, flash driving status information, speaker driving status information, and the like. The wireless power receiver may determine whether a switch to a fast charge mode is required based on the operating state of the peripheral device.

As a result of the determination, if the charging mode change is required, the wireless power receiver may generate a predetermined charging mode packet including the charging mode value to be changed and transmit the packet to the wireless power transmitter (S2307).

If it is determined in step 2305 that the change of the charging mode is not required, the wireless power receiver may return to step 2301. FIG.

In the description of FIG. 23, it is described that the wireless power receiver determines whether to change the charging mode based on the receiver status information, but this is only one embodiment. In another example, When the switching to the specific charging mode is requested according to the selection of the predetermined user menu on the wireless terminal, the wireless terminal may generate a charging mode packet requesting switching to the charging mode and transmit the packet to the wireless power transmitter.

24 is a diagram for explaining a wireless charging method on a wireless charging system according to an embodiment.

24 is a flowchart for explaining a charging mode switching procedure on the wireless charging system.

Referring to FIG. 24, the wireless power transmitter 2410 generates a predetermined first packet informing the fast charge support when a first control error packet is received from the wireless power receiver 2420 after a transition from the identification and configuration step to the power transfer step To the wireless power receiver 2420 (S2401 to S2402). The wireless power receiver 2420 may be configured to determine that the wireless power transmitter 2410 supports the fast charge mode based on the received first packet and if it is a device capable of fast charge, Response packet to the wireless power transmitter 2410 (S2403).

The wireless power receiver 2420 and the wireless power transmitter 2410 can switch to the fast charge mode at the same time when the predetermined charge mode change waiting time elapses and fix the operation frequency to start the fast charge (S2404). Here, the charging mode change waiting time may be predetermined or may be determined by the wireless power receiver 2420 as shown in FIG. 15, and then transmitted to the wireless power transmitter 2410 through the first response packet. The fixed operating frequency may also be predefined or determined by the wireless power receiver 2420, as shown in FIG. 16 above, and then communicated to the wireless power transmitter 2410 via the first response packet.

Therefore, since the embodiment performs stable wireless charging at an operating frequency for generating an AC signal, the charging disconnection is prevented, and compared with the wireless charging at an operating frequency generating an unstable AC signal, wide.

25 is a diagram for explaining a wireless charging method in a wireless power transmitter according to an embodiment.

Referring to FIG. 25, when a packet for initial power control after a transition is received from a wireless power receiver to a power transmission step, the wireless power transmitter generates a predetermined first packet indicating that the fast charge mode is supported and transmits the packet to the wireless power receiver (S2501 to S2502).

The wireless power transmitter may receive a predetermined first response packet including the charging mode value (S2503).

The wireless power transmitter can confirm that the charging mode value is the fast charging mode (S2504).

As a result, if the wireless power transmitter is in the fast charging mode, the wireless power transmitter can charge the operation frequency in a fast charging mode after a predetermined time elapses (S2505). The predetermined time may be pre-defined in the first response packet, or may be a charge mode change waiting time, as shown in FIG. Also, the fixed operating frequency may be predefined in the first response packet, or may be an operating frequency for generating an alternating signal, as shown in FIG.

If it is determined in step 2504 that the wireless power transmitter is not in the fast charging mode, that is, in the general low power charging mode, the wireless power transmitter can perform charging in the general low power charging mode (S2506).

26 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

26, the wireless power transmitter determines whether the charging mode value is set to the fast-charge mode in the identifying step 530 (or the identifying and configuring step 430) or the power transmitting step 440, 540 of FIGS. The charging mode packet can be received (S2601).

At this time, the wireless power transmitter can determine whether fast charging is possible (S2602).

As a result of the determination, if the fast charging is possible, the wireless power transmitter may generate a first packet indicating that the fast charging mode is supported and transmit the first packet to the wireless power receiver (S2603).

The wireless power transmitter may fix the operating frequency and perform wireless charging in a fast charging mode after a predetermined time elapses (S2604).

As a result of the determination in step 2602, if the fast power charging is not possible, the wireless power transmitter transmits a predetermined second packet indicating that fast charging can not be provided for the wireless power receiver, (S2605 to S2606).

27 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.

27 is a flowchart for explaining a charging mode switching procedure on the wireless charging system.

27, when a first control error packet is received from the wireless power receiver 2720 after a transition from the identification and configuration step to the power transmission step, the wireless power transmitter 2710 generates a first packet To the wireless power receiver 2720 (S2701 to S2702). The wireless power receiver 2720 may be configured to determine that the wireless power transmitter 2710 supports the fast charge mode based on the received first packet and if it is a device capable of fast charge, Response packet to the wireless power transmitter 2710 (S2703).

The wireless power transmitter 2720 may generate an AC signal by changing the operating frequency to receive the stable control error packet with a value of the control error packet of 0 (S2704). The wireless power transmitter 2720 may change the operating frequency until a steady control error packet with a control error packet of zero is received when the value of the control error packet is not zero. According to the embodiment, even if the value of the control error packet is not 0, it can be changed to the operation frequency when the variation width of the control error packet is kept within a certain range. Therefore, the stable control error packet may include a case where the width of the power fluctuation required in the control error packet is small, or the width of the power fluctuation is kept constant.

When the wireless power transmitter 2710 continuously receives the stable control error packets at a predetermined number or more, the wireless power transmitter 2710 can switch to the fast charge mode at the same time and fix the operating frequency to start the fast charge (S2705). Here, the charge mode changeable control error packet count value is determined or determined by the wireless power receiver 2720, as shown in FIG. 17, and then transmitted to the wireless power transmitter 2710 through the first response packet .

Therefore, since the embodiment performs stable wireless charging at an operating frequency for generating an AC signal, the charging disconnection is prevented, and compared with the wireless charging at an operating frequency generating an unstable AC signal, wide.

28 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

28, when a packet for initial power control after a transition is received from a wireless power receiver to a power transmission step, the wireless power transmitter generates a predetermined first packet indicating that the fast charge mode is supported and transmits the packet to the wireless power receiver (S2801 to S2802).

The wireless power transmitter may receive a first response packet containing the charging mode value (S2803).

The wireless power transmitter can confirm that the charging mode value is the fast charging mode (S2804).

As a result, if the charging mode value is the fast charging mode, the wireless power transmitter can change the operating frequency and generate an AC signal and confirm whether it receives the stable control error packet (S2805).

At a particular operating frequency at which the steady control error packet is received, the wireless power transmitter can determine whether the number of consecutively received stable control error packets is greater than or equal to a predetermined value (S2806). The wireless power transmitter can repeat step S2805 if the counted number of consecutively received stable control error packets is less than a predetermined value.

As a result, if the counted number of consecutively received stable control error packets is equal to or greater than a predetermined value, the wireless power transmitter can perform the charging operation while fixing the operating frequency in the fast charging mode (S2807). The predetermined value may be predefined in the first response packet, or may be a charge mode change stable control error packet count value, as shown in FIG. In the embodiment, the fast charge mode refers to setting or switching the inverter type to the full type, and setting or switching the power control type to the phase control type.

As a result of the determination in step 2804, if the wireless power transmitter is not in the fast charging mode, that is, in the general low power charging mode, the wireless power transmitter can perform charging in the general low power charging mode (S2808).

In the embodiment, the general low-power charging mode refers to setting or switching the in-putter type to the half bridge type, and setting or switching the power control mode to the frequency control mode.

29 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

Referring to Figure 29, the wireless power transmitter determines whether the charge mode value is set to the fast charge mode in the identifying step 530 (or identification and configuration step 430) or power transfer step 440, 540 of Figures 4-5, The charging mode packet can be received (S2901).

At this time, the wireless power transmitter can determine whether fast charging is possible (S2902).

As a result of the determination, if the fast charging is possible, the wireless power transmitter may generate a predetermined first packet indicating that the fast charging mode is supported and transmit the first packet to the wireless power receiver (S2903).

In the embodiment, the fast charge mode refers to setting or switching the inverter type to the full type, and setting or switching the power control type to the phase control type.

The wireless power transmitter may change the operating frequency and generate an alternating current signal to confirm whether it receives a stable control error packet (S2904).

At a specific operating frequency at which the steady control error packet is received, the wireless power transmitter can determine whether the counted number of consecutively received steady control error packets is greater than or equal to a predetermined value (S2905). The wireless power transmitter may repeat step S2904 if the counted number of consecutively received stable control error packets is less than a predetermined value.

As a result, if the counted number of consecutively received stable control error packets is equal to or greater than a predetermined value, the wireless power transmitter can perform the charging operation by fixing the operating frequency in the fast charging mode (S2906). The predetermined value may be predefined in the charge mode packet or may be a charge mode change stable control error packet count value, as shown in FIG.

In the embodiment, the fast charge mode refers to setting or switching the inverter type to the full type, and setting or switching the power control type to the phase control type.

As a result of the determination in step 2902, if the fast power charging is not possible, the wireless power transmitter transmits a predetermined second packet indicating that fast charging can not be provided for the wireless power receiver, (S2907 to S2908).

In the embodiment, the general low-power charging mode refers to setting or switching the inverter type to the half-bridge type, and setting or switching the power control mode to the frequency control mode.

30 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.

30 is a diagram for explaining a method for controlling the wireless charging power based on the control error packet (CEP) after the switching of the charging mode on the wireless charging system.

Referring to FIG. 30, the wireless power transmitter 3010 may receive a control error packet (CEP) from the wireless power receiver 3020 before commencing a fast charge mode in a general low power charge mode (S3001).

The wireless power receiver 3020 and the wireless power transmitter 3010 may initiate fast charging according to the charging mode switching procedure on the wireless charging system of Figs. 24-29 (S3002).

The wireless power transmitter 3010 may suspend the power control by the control error packet (CEP) received during the power control suspension time by the control error packet (CEP) or the control error packet (CEP) received in step S3001 (S3003 to S3004). Here, the power control stop time due to the control error packet (CEP) may be predefined or determined by the wireless power receiver 3020, as shown in FIG. 18, and then transmitted via the first response packet to the wireless power transmitter 3010 ). ≪ / RTI > Also, the wireless power transmitter 3010 may perform power control of wireless charging based on a predetermined packet or control error value rather than a control error packet (CEP) during a power control pause time due to a control error packet (CEP) .

The wireless power transmitter 3010 may initiate the wireless charging power control based on the control error packet (CEP) received after the lapse of the power control stop time due to the predetermined control error packet (CEP) (S3005 To S3006).

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

31 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

Referring to FIG. 31, the wireless power transmitter can perform charging in the fast charging mode in the power transmission step (S3101).

The wireless power transmitter may stop the power control based on the control error packet (not shown) received before the fast charge mode switch or the control error packet (CEP) received after switching to the fast charge mode (S3102).

The wireless power transmitter can confirm whether the elapsed time from the start of fast charging is equal to or longer than the power control stop time due to the control error packet (S3103). The power control pause time due to the control error packet may be predefined, or may be determined by the wireless power receiver as shown in FIG. 18, and then forwarded to the wireless power transmitter via the first response packet

If it is determined that the elapsed time is equal to or greater than the stop time, the wireless power transmitter may start power control based on the control error packet received after the power control stop time due to the control error packet (S3104).

If it is determined in step S3103 that the elapsed time has not reached the stop time, the wireless power transmitter may repeat step S3102.

32 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.

32 is a diagram for explaining a method for controlling the wireless charging power based on the control error packet (CEP) after switching the charging mode on the wireless charging system.

Referring to FIG. 32, the wireless power transmitter 3210 may perform power control based on a control error packet (CEP) received in a general low-power charging mode and a first control error weight (S3201 to S3202). Where the first control error weight may be predefined or determined by the wireless power receiver 3220, as shown in FIG. 19 above, and then communicated to the wireless power transmitter 3210 via the first response packet.

The wireless power receiver 3020 and the wireless power transmitter 3010 may initiate fast charging according to the charging mode switching procedure on the wireless charging system of Figures 24 to 29 (S3203).

The wireless power transmitter 3210 is configured to receive a control error packet (CEP) received in a general low power charge mode after switching to a fast charge mode, a control error packet (CEP) received in a fast charge mode, (S3204 to S3205). Where the second control error weight may be predefined or passed to the wireless power transmitter 3210 via a first response packet after being determined by the wireless power receiver 3220 as shown in FIG. In addition, the control error packet (CEP) received in the general low power charging mode may be a control error packet received before the switch to the fast charge mode but based on the power control after switching to the fast charge mode.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

33 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

Referring to FIG. 33, the wireless power transmitter can perform charging in the fast charging mode in the power transmission step (S3301).

The wireless power transmitter may receive a control error packet (not shown) before switching to the fast charge mode or receive a control error packet after switching to a fast charge mode (S3302). The received control error packet before switching to the fast charge mode may be a control error packet received prior to switching to fast charge mode but based on power control after switching to fast charge mode.

The wireless power transmitter may generate the second control error value by reflecting the control error weight on the first control error value of the received control error packet (S3303). The control error weight may be predefined, or may be determined by the wireless power receiver, as shown in FIG. 19 above, and then communicated to the wireless power transmitter via the first response packet.

The wireless power transmitter may control the transmit power based on the generated second control error value (S3304). Thereafter, the wireless power transmitter may return to step S3302 while performing charging in the fast charging mode.

 Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

FIG. 34 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.

FIG. 34 is a diagram for explaining a method of controlling wireless charging power based on a control error packet (CEP) after switching the charging mode on the wireless charging system.

34, the wireless power transmitter 3410 may receive a control error packet (CEP) from the wireless power receiver 3420 (S3401) before commencing a fast charge mode in a general low power charging mode.

Wireless power receiver 3420 and wireless power transmitter 3410 may initiate a fast charge according to the charging mode switching procedure on the wireless charging system of Figs. 24-29 (S3402).

The wireless power transmitter 3410 performs power control based on the control error packet (CEP) received in the general low power charge mode after switching to the fast charge mode, the control error packet (CEP) received in the fast charge mode, and the control error weight (S3203 to S3204). Where the control error weights may be predefined or passed to the wireless power transmitter 3410 via a first response packet after being determined by the wireless power receiver 3420 as shown in FIG. In addition, the control error packet (CEP) received in the general low power charging mode may be a control error packet received before the switch to the fast charge mode but based on the power control after switching to the fast charge mode.

The wireless power transmitter 3410 may initiate wireless charging power control based on the control error packet (CEP) received after the elapse of the predetermined control error weighting application time (S3005 to S3006). That is, the wireless power transmitter 3410 may perform wireless charging power control without weighting the control error value of the received control error packet (CEP). Here, the control error weighting time may be predetermined or may be determined by the wireless power receiver 3420 as shown in FIG. 20, and then transmitted to the wireless power transmitter 3410 through the first response packet.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

FIG. 35 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.

Referring to FIG. 35, the wireless power transmitter can perform charging in the fast charging mode in the power transmitting step (S3501).

The wireless power transmitter may receive the control error packet before switching to the fast charge mode (S3502) or receive the control error packet after switching to the fast charge mode. The received control error packet before switching to the fast charge mode may be a control error packet received prior to switching to fast charge mode but based on power control after switching to fast charge mode.

The wireless power transmitter may generate the second control error value by reflecting the control error weight on the first control error value of the received control error packet (S3503). The control error weight may be predefined, or may be determined by the wireless power receiver, as shown in FIG. 20 above, and then communicated to the wireless power transmitter via the first response packet.

The wireless power transmitter may control the transmit power based on the generated second control error value (S3504).

The wireless power transmitter can check whether the elapsed time from the start of fast charging is equal to or longer than the control error weight application time (S3505). The control error weighting time may be predefined, or may be determined by the wireless power receiver, as shown in FIG. 20 above, and then communicated to the wireless power transmitter via the first response packet.

If it is determined that the elapsed time is equal to or longer than the applicable time, the wireless power transmitter transmits the control error packet received before the control error weight applying time or the first control error value of the control error packet received after the application time Power can be controlled (S3506).

If it is determined in step S3105 that the elapsed time has not reached the application time, the wireless power transmitter may repeat step S3502.

Therefore, another embodiment can utilize a smaller control error value required in the fast charge mode rather than the control error value required in the general low-power mode, thereby preventing the overvoltage generated in the power control. Still further, another embodiment is capable of stably controlling power in high speed wireless charging.

36 is a diagram for explaining a wireless charging transmission coil according to an embodiment.

Referring to FIG. 36, three transmission coils can be arranged. At least one of the plurality of transmission coils may be disposed in an overlapped manner in order to perform a uniform power transmission within a constant sized charging area. 36, the first coil 3610 and the second coil 3620 are disposed on the first layer side by side at a predetermined interval on the shielding member 3640, and the third coil 3630 is disposed on the first coil and the second coil And can be superimposed on the second layer.

The first coil 3610, the second coil 3620 and the third coil 3630 may be manufactured according to the standard of the coil defined in WPC or PMA and may be manufactured in the same range can do.

For example, the transmit coil may have the specifications shown in Table 1 below.

[Table 1]

The first coil 3610, the second coil 3620, and the third coil 3630 correspond to the external lengths defined in Table 1, Inner length, outer width, inner width, thickness, and winding. Of course, the first coil 3610, the second coil 3620, and the third coil 3630 may have the same physical characteristics within an error range by the same manufacturing process.

21, each of the first coil 3610, the second coil 3620, and the third coil 3630 may have different values of inductance measured depending on positions where the first coil 3610, the second coil 3620, and the third coil 3630 are disposed in relation to the shielding material.

For example, the first coil 3610 and the second coil 3620 satisfy the specifications of Table 1 and have an inductance of 12.5uH, and the third coil 3630 has a distance from the shielding material to the first coil 3630. [ And may have an inductance that is less than 12.5 uH different from the first coil 3610 and the second coil 3620.

For example, the first coil 3610 and the second coil 3620 are disposed in contact with the shielding material, but the third coil 3630 may be disposed apart from the shielding material by a predetermined height.

In one embodiment, an adhesive may be disposed between the first coil 3610, the second coil 3620, or the third coil 3630 and the shielding material.

Therefore, in an embodiment, the third coil 3630 may have a larger number of turns than the turns of the first coil 3610 and the second coil 3620 to have the same inductance as the first coil 3610 and the second coil 3620, (For example, 0.5 times or 1 time or 2 times).

In one embodiment, the third coil 3630 may have 12.5 times or 13 times or 14 times of turns.

In other words, the centrally positioned third coil 3630 is located farther away from the shield than the first and second coils 3610 and 3620 so that the measured inductance is greater than the inductance of the first coil 3610 and the second coil 3620 So that the length of the conductor constituting the third coil 3630 can be made longer than that of the first coil 3610 and the second coil 3620 so that the inductance can be adjusted to be the same.

The length of the conductor constituting the third coil 3630 is made slightly longer than the first coil 3610 and the second coil 3620 so that the third coil 3630 is connected to the first coil 3630, The inductance of the three coils may be equal to 12.5uH although the second coil 3620 and the second coil 3620 are located farther from the shield. In one embodiment, the same inductance of a coil means having an error range of +/- 0.5uH.

As the distance from the shielding material to the shielding coils increases, the measured inductance of the transmission coil overlaps with the shielding material. The longer the distance to the shielding material, the longer the length of the transmission coil to increase the inductance.

37 is a diagram for explaining three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils according to an embodiment.

37, when three coils included in a wireless power transmitter have different inductances, three drive circuits 3710 connected to respective coils and three capacitors for generating the same resonance frequency An LC resonance circuit 3720 is required.

Although the wireless power transmitter includes a plurality of coils, the resonant frequency that the wireless power transmitter generates to perform the power transmission should not depend on each of the transmit coils, and must conform to the standard resonant frequency supported by the wireless power transmitter.

The resonance frequency generated in the LC resonance circuit 3720 may vary depending on the inductance of the coil and the capacitance of the capacitor.

For example, the resonant frequency (fr) may be 100 KHz, and when the capacitance of the capacitor connected to the coil to generate the resonance frequency is 200 nF, if only one capacitor is used, all three coils are 12.5 uH. When the inductances of the three coils are different from each other, three capacitors having different capacitances corresponding to each other are required in order to generate a resonance frequency of 100 kHz. In addition, three drive circuits 3710 including an inverter for applying an AC voltage in each of the LC resonance circuits 3720 are also required.

38 is a diagram illustrating a wireless power transmitter including a plurality of coils and one drive circuit according to an embodiment.

38, when the inductances of the three coils of the wireless power transmitter are the same, the wireless power transmitter may include only one drive circuit 3810, and one drive circuit 3810 and three coils And the switch 3830 to connect the coil of the wireless power transmitter having the highest power transmission efficiency.

Compared with FIG. 37, the wireless power transmitter can reduce the area occupied by the components by using only one drive circuit 3810, thereby making it possible to miniaturize the wireless power transmitter itself and reduce the cost of raw materials required for manufacturing .

In one embodiment, the wireless power transmitter may use the signal strength indicator in the ping phase to calculate the power transfer efficiency between the three coils of the wireless power transmitter and the coils of the wireless power receiver.

Alternatively, the wireless power transmitter may calculate the coupling coefficient between the transmitting and receiving coils to select a coil of the wireless power transmitter having a high coupling coefficient.

Alternatively, the wireless power transmitter may calculate a Q factor to control the switch 3830 to identify the coil of the high power wireless power transmitter and connect it to the drive circuit 3810.

39 is a view for explaining a plurality of switches for connecting any one of the plurality of transmission coils to the drive circuit according to the embodiment.

39, the power transmission unit includes a drive circuit 3910 for converting an input voltage, a switch 3920 for connecting the drive circuit 3910 and the LC resonance circuit, a plurality of transmission coils 3930, a plurality of wireless power transmitters 3910, One capacitor 3940 connected in series with the coil of the switch 3920, and a control unit 3950 for controlling the opening and closing of the switch 3920.

The control unit 3950 identifies the coils of the wireless power receiver among the plurality of coils 3930 of the wireless power transmitter and the coils of the wireless power transmitter with the highest power transmission efficiency and outputs the coils of the identified wireless power transmitter to the drive circuit 3910. [ Lt; RTI ID = 0.0 > switch < / RTI >

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 (24)

A power transmission section including at least one transmission coil;
A power conversion unit for converting an intensity of power applied from the outside;
And a control unit for controlling a charging mode and a charging power amount for the wireless power receiving apparatus,
Wherein the charging mode includes a first charging mode and a second charging mode,
Wherein the control unit controls the charging mode to be changed from the first charging mode to the second charging mode based on the charging mode packet received from the wireless power receiving apparatus,
The control unit controls the charging power based on the control error packet received from the wireless power receiving apparatus,
The control unit changes the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode,
Wherein the recharge mode packet includes information on a power control down time. The method according to claim 1,
And stops the charging power control based on the control error packet during the power control pause time. The method according to claim 1,
Wherein the charge mode packet includes information on a charge mode change operating frequency. The method according to claim 1,
Wherein the control error packet comprises a steady control error packet. The method of claim 3,
Wherein the charge mode packet includes information on the stable control error packet count value. A power transmission section including at least one transmission coil;
A power conversion unit for converting an intensity of power applied from the outside;
And a control unit for controlling a charging mode and a charging power amount for the wireless power receiving apparatus,
Wherein the charging mode includes a first charging mode and a second charging mode,
Wherein the control unit controls the charging mode to be changed from the first charging mode to the second charging mode based on the charging mode packet received from the wireless power receiving apparatus,
The control unit controls the charging power based on the control error packet received from the wireless power receiving apparatus,
The control unit changes the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode,
Wherein the charge mode packet includes information on a control error weight. The method according to claim 6,
And controls the charging power amount by reflecting the control error weight to the control error packet. 8. The method of claim 7,
Wherein the charge mode packet includes information on a control error weighting application time. 9. The method of claim 8,
And controls the charging power amount by reflecting the control error weight on the control error packet during the control error weighting application time. The method according to claim 6,
Wherein the charge mode packet includes information on a charge mode change operating frequency. The method according to claim 6,
Wherein the control error packet comprises a steady control error packet. 12. The method of claim 11,
Wherein the charge mode packet includes information on the stable control error packet count value. A wireless power transmission method for wirelessly transmitting power to a wireless power receiver,
Controls a charging mode and a charging power for the wireless power receiving apparatus,
Wherein the charging mode includes a first charging mode and a second charging mode,
Controls the charging mode to change from the first charging mode to the second charging mode based on a charging mode packet received from the wireless power receiving apparatus,
Controls a charging power amount based on a control error packet received from the wireless power receiving apparatus,
Changing the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode,
Wherein the charge mode packet includes information on power control pause time. 14. The method of claim 13,
And stops the charging power control based on the control error packet during the power control pause time. 14. The method of claim 13,
Wherein the charge mode packet includes information on a charge mode change operating frequency. 14. The method of claim 13,
Wherein the control error packet comprises a steady control error packet. 16. The method of claim 15,
Wherein the charge mode packet includes information on the stable control error packet count value. A wireless power transmission method for wirelessly transmitting power to a wireless power receiver,
Controls a charging mode and a charging power amount for the wireless power receiving apparatus,
Wherein the charging mode includes a first charging mode and a second charging mode,
Controls the charging mode to change from the first charging mode to the second charging mode based on a charging mode packet received from the wireless power receiving apparatus,
Controls a charging power amount based on a control error packet received from the wireless power receiving apparatus,
Changing the manner of controlling the charging power amount based on the control error packet when the charging mode is changed from the first charging mode to the second charging mode,
Wherein the charge mode packet includes information on a control error weight. 19. The method of claim 18,
And controlling the charging power amount by reflecting the control error weight to the control error packet. 20. The method of claim 19,
Wherein the charge mode packet includes information on a control error weighting application time. 21. The method of claim 20,
And controlling the charging power amount by reflecting the control error weight on the control error packet during the control error weight application time. 19. The method of claim 18,
Wherein the charge mode packet includes information on a charge mode change operating frequency. 19. The method of claim 18,
Wherein the control error packet comprises a steady control error packet. 24. The method of claim 23,
Wherein the charge mode packet includes information on the stable control error packet count value.

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