KR20180057069A - Wireless Charging Method and Apparatus and System therefor - Google Patents

Abstract

The present invention relates to wireless power transmission technology, and more particularly, to a wireless charging method capable of high-speed wireless charging and an apparatus and system therefor. A wireless power transmitter according to an embodiment includes a power transmitting part including one or more transmission coils; a power conversion part for converting the intensity of DC power applied from the outside; a driving part for converting DC power applied from the power conversion part to AC power using one or more inverters and providing the AC power to the one or more transmission coils; a communication part for exchanging information with an external device; and a control part for controlling a charging mode based on a charging mode packet received through the communication part. If the charging mode is a fast charge mode, the inverter may be of a full bridge type.

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, in the conventional high-speed wireless charging technology, there is a problem that the noise current increases as the charging power increases, and consequently, the charging is interrupted during high-speed wireless charging.

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 apparatus and system therefor that determine an inverter type or a power control method adaptively according to the intensity of the output power.

It is still another object of the present invention to provide a wireless charging method for stably controlling power in high-speed wireless charging and an apparatus and system therefor.

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 communication system including: a power transmission unit including at least one transmission coil; A power converter for converting the intensity of DC power applied from the outside; A driving unit that converts DC power applied from the power conversion unit to AC power using one or more inverters and provides the AC power to the one or more transmission coils; A communication unit for exchanging information with an external device; And a control unit for controlling the charging mode based on the charging mode packet received through the communication unit. When the charging mode is the fast charging mode, the inverter can provide a full bridge type wireless power transmitter.

In the wireless power transmitter of the present invention, if the charging mode value included in the charging mode packet is a value corresponding to the fast charging mode, the control unit switches the normal low power charging mode set as the default to the fast charging mode, can do.

In addition, the wireless power transmitter of the present invention may further include the charge mode change operation frequency value.

Also, in the wireless power transmitter of the present invention, the charging mode changing operation frequency may be a predetermined operating frequency that is fixed when generating the AC signal in the fast charging mode.

Further, in the wireless power transmitter of the present invention, the charging mode changing operation frequency may be preset.

In the wireless power transmitter of the present invention, the charging mode changing operating frequency may be an operating frequency at which the AC power is stably generated at the end of wireless charging before the wireless charging starts.

In addition, in the wireless power transmitter of the present invention, when the AC power is stably generated in the general low-power charging mode, the controller may switch to the fast charging mode to perform charging.

In addition, the wireless power transmitter of the present invention may further include the charging mode change-stable-control error packet count value.

In the wireless power transmitter of the present invention, the control error packet may have a control error value of 0 in the stable control error packet.

In the wireless power transmitter of the present invention, when the number of consecutively received stable control error packets is equal to or greater than the count value of the stable mode control error packet count, the controller switches from the normal low power charge mode to the fast charge mode, Can be performed.

In addition, in the wireless power transmitter of the present invention, the controller may set the operating frequency fixed when the AC signal is generated in the fast charging mode to the operating frequency when the AC power is stably generated in the normal low-power charging mode.

In addition, in the wireless power transmitter of the present invention, the controller may set the operating frequency fixed when generating the AC signal in the fast-charge mode to a frequency that is equal to or greater than the count value of the stable mode control error packet count It is possible to set the operating frequency at the time.

In addition, in the wireless power transmitter of the present invention, the driving unit may further include an AC signal controller for adjusting an AC power output from the inverter based on a predetermined control signal of the controller.

In addition, in the wireless power transmitter of the present invention, the driving unit may further include an AC signal controller for adjusting an AC power output from the inverter based on a predetermined control signal of the controller.

In the wireless power transmitter of the present invention, the AC signal control unit may include: an AC frequency generator for generating an AC signal having a specific operating frequency; And a phase shifter for adjusting the phase of the AC signal to adjust the intensity of the average transmission power output from the transmission coil.

In the wireless power transmitter of the present invention, the power transmitting unit may include a plurality of transmitting coils, and the power converted by the power converting unit or the driving unit may be controlled to be transmitted to one of the plurality of transmitting coils And may include a multiplexer.

As another means for solving the above-mentioned problem, there is provided a receiving coil comprising: 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 private communication unit to identify whether or not the external device is capable of fast charging and determining whether the charging mode currently being executed 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 controller determines that the charging mode value included in the charging mode packet is a value corresponding to the fast charging mode , It is possible to perform charging by switching the normal low power charging mode set to the default to the fast charging mode.

Also, in the wireless power receiver of the present invention, the charge mode packet may further include a charge mode change operation frequency value.

Also, in the wireless power receiver of the present invention, the charge mode change operation frequency may be a predetermined operation frequency that is fixed when generating the AC signal in the fast charge mode.

Further, in the wireless power receiver of the present invention, the charging mode changing operation frequency can be preset.

Also, in the wireless power receiver of the present invention, the charging mode changing operation frequency may be an operating frequency at which the AC power is stably generated at the end of the wireless charging before the wireless charging is started.

In addition, in the wireless power receiver of the present invention, when the AC power is stably generated in the general low power charging mode, the controller can switch to the fast charging mode and perform charging.

In addition, the wireless power receiver of the present invention may further include the charge mode change-stable change control error packet count value.

Also, in the wireless power receiver of the present invention, the control error packet may have a control error value of 0 in the stable control error packet.

In the wireless power receiver of the present invention, when the number of consecutively received stable control error packets is equal to or greater than the count value of the stable mode control error packet count, the controller switches from the normal low power charging mode to the fast charging mode, Can be performed.

In addition, in the wireless power receiver of the present invention, the controller may set the operating frequency fixed when the AC signal is generated in the fast charging mode to the operating frequency when the AC power is stably generated in the normal low-power charging mode.

In addition, in the wireless power receiver of the present invention, the controller may set the operating frequency, which is fixed when the AC signal is generated in the fast-charge mode, to a value equal to or greater than the count value of the stable- It is possible to set the operating frequency at the time.

As a further solution to the above-mentioned problem, there is provided a wireless charging method in a wireless power receiver for receiving power from a wireless power transmitter wirelessly, comprising the steps of: collecting receiver state 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 if the charging mode is to be changed as a result of the determination, Value or a change in charge mode stability control error packet counting value.

A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, 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 performing the charging by switching to a charging mode corresponding to the charging mode value comprises: The charging can be performed in the fast charging mode by fixing the operating frequency.

A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, comprising the steps of: receiving a charging mode packet in which a charging mode value is set to a value corresponding to a fast charging mode; ; Determining whether the fast charge mode is supported; Transmitting a predetermined first packet to the wireless power receiver indicating that the fast charge mode is supported if the fast charge mode is supported; And fixing the operating frequency and performing wireless charging in a fast charging mode after a predetermined time elapses; If it is determined that the fast charge mode is not supported, the method may include transmitting a second packet indicating that the fast charge mode is not supported.

A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, 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; Confirming that the charge mode value is a fast charge mode; If the charging mode value is the fast charging mode, changing the operating frequency and generating an AC signal and confirming whether the stable control error packet is received; Confirming at a particular operating frequency that a stable control error packet is received that the number of consecutively received stable control error packets is greater than or equal to a predetermined value; And if the counted number of consecutively received stable control error packets is equal to or greater than a predetermined value, fixing the operating frequency in a fast charging mode and performing charging.

A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver, comprising the steps of: receiving a charging mode packet in which a charging mode value is set to a value corresponding to a fast charging mode; ; Determining whether the fast charge mode is supported; Transmitting a predetermined first packet to the wireless power receiver indicating that the fast charge mode is supported if the fast charge mode is supported; Changing an operating frequency and generating an AC signal and confirming whether a stable control error packet is received; Confirming at a particular operating frequency that a stable control error packet is received that the number of consecutively received stable control error packets is greater than or equal to a predetermined value; And if the counted number of consecutively received stable control error packets is greater than or equal to a predetermined value, fixing the operating frequency in a fast charge mode and performing charging.

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 determine the inverter type or the power control method adaptively according to the intensity of the output power.

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.
FIG. 18 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 the wireless power transmission procedure; FIG.
19 is a diagram of a charge mode state for explaining a charge mode change according to an embodiment.
20 is a diagram for explaining a wireless charging method in a wireless power receiver according to an embodiment.
21 is a diagram for explaining a wireless charging method on a wireless charging system according to an embodiment.
22 is a diagram for explaining a wireless charging method in a wireless power transmitter according to an embodiment.
23 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
24 is a diagram for explaining a wireless charging method on a wireless charging system according to another embodiment.
FIG. 25 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
26 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another embodiment.
27 is a block diagram illustrating a structure of a wireless power control apparatus according to an embodiment.
FIG. 28 is a block diagram for explaining the detailed structure of the first AC signal controller 2724 of FIG. 27; FIG.
29 is a diagram for explaining the basic operation principle of an inverter for converting a DC signal into an AC signal according to an embodiment.
30 is an equivalent circuit diagram of a wireless power transmission apparatus equipped with a half bridge type inverter according to an embodiment.
31 is an equivalent circuit diagram of a wireless power transmission apparatus equipped with a full bridge type inverter according to an embodiment.
32 is a flowchart for explaining a wireless power control method for wireless charging in a general low-power charging mode according to an embodiment.
33 is a flowchart for explaining a wireless power control method for wireless charging in a general low-power charging mode according to another embodiment.
FIG. 34 is a view for explaining a method of switching an inverter type and a power control scheme according to a change in transmission power intensity in a general low-power charging mode according to an embodiment.
FIG. 35 is a flowchart illustrating a method of controlling wireless power in a state in which a half bridge is activated in a general low-power charging mode according to an embodiment.
FIG. 36 is a flowchart illustrating a method of controlling wireless power in a state where a full bridge is activated in a general low-power charging mode according to an embodiment.
FIG. 37 is a block diagram for explaining the detailed structure of the second AC signal controller 2726 of FIG. 27; FIG.
FIG. 38 is a diagram for explaining a power control method according to a change in transmission power intensity in a fast charge mode according to an embodiment.
FIG. 39 is a flowchart for explaining a method of controlling radio power in a full-bridge activated state in the fast-charge mode according to an embodiment.
40 is a view for explaining a wireless charging transmission coil according to an embodiment.
41 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.
42 is a diagram for describing a wireless power transmitter including a plurality of coils according to an embodiment and including one drive circuit;
43 is a view for explaining a plurality of switches for connecting any one of a plurality of transmission coils to a drive circuit according to an 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, (Lower) "and" front or rear "encompass both that the two components are in direct contact with each other or that 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, (Hereinafter referred to as a " device ") capable of charging a battery by mounting a wireless power receiving means according to an embodiment, but not limited thereto, may be used for a small electronic device such as a toothbrush, an electronic tag, a lighting device, Quot;), and the term terminal or device may 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 wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA). In addition, the wireless power receiving means for supporting the electromagnetic resonance method may include a resonance wireless charging technique defined in the A4WP (Alliance for Wireless Power) standard mechanism, which is a standard wireless charging technology standard.

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. Here, the detailed configuration of the charge mode packet is made more clear through the description of FIGS. 13 to 17 to be described later. Of course, 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.

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, any one of undefined values of the packet header values defined before the current wireless charging table may be used as the header value of the charging mode packet. 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 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. 18, in the power transmission step, a packet that can be transmitted by the wireless power receiving apparatus includes a control error packet, an end power transfer packet, a received power packet, A packet (Charge Status Packet), a packet defined by a manufacturer, and the like.

Reference numeral 1801 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 1802 denotes a message format of an End Power Transfer Packet configured with a 1-byte End Power Transfer Code.

Reference numeral 1803 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 1804 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.

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

Referring to FIG. 19, the power transmission steps 440 and 540 shown in FIGS. 4 and 5 may include a first charging mode 1910 in which general low-power charging is performed and a second charging mode 1920 in which fast charging is performed. have.

The first charging mode 1910 and the second charging mode 1920 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 1920 when receiving a request to switch from the electronic device to the second charging mode 1920 during charging in the first charging mode 1910 The charging mode can be changed by transmitting a predetermined packet. In another example, the wireless power receiver may transmit a predetermined packet to the wireless power transmitter requesting a switch to the first charging mode 1910 when the battery charge level reaches a predetermined threshold during charging to the second charging mode 1920 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 is no longer able to provide 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 (1920) 1910). ≪ / RTI >

Although the charging mode is divided into the first charging mode 1910 and the second charging mode 1920 in the above embodiment, this is only one embodiment, and a new charging mode is defined and added It is possible. As an example, the second charging mode 1920 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.

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

Referring to FIG. 20, when the wireless power receiver enters the power transmission step, it can collect its own status information (i.e., receiver status information) (S2001).

The wireless power receiver may determine whether a charge mode change is required based on the collected receiver state information (S2003 to S2005).

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 change of the charging mode is required, the wireless power receiver can generate a predetermined charging mode packet including the charging mode value to be changed and transmit the packet to the wireless power transmitter (S2007).

If it is not necessary to change the charging mode in step 2005, the wireless power receiver may return to step 2001.

In the description of FIG. 20, 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.

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

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

Referring to FIG. 21, the wireless power transmitter 2110 generates a first packet informing of fast charge support when a first control error packet is received from the wireless power receiver 2120 after a transition from the identification and configuration step to the power transfer step To the wireless power receiver 2120 (S2101 to S2102). The wireless power receiver 2120 may be configured to determine that the wireless power transmitter 1510 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 2110 (S2103).

The wireless power receiver 2120 and the wireless power transmitter 2110 can switch to the fast charge mode at the same time when the predetermined charge mode change wait time elapses, and can quickly charge the battery by fixing the operation frequency (S2104). Here, the charging mode changeover wait time may be predetermined or may be determined by the wireless power receiver 2120, as shown in FIG. 15, and then transmitted to the wireless power transmitter 2110 via the first response packet. The fixed operating frequency may also be predefined or determined by the wireless power receiver 2120, as shown in FIG. 16 above, and then communicated to the wireless power transmitter 2110 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.

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

22, 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 (S2201 to S2202).

The wireless power transmitter may receive a first response packet containing the charging mode value (S2203).

The wireless power transmitter can confirm that the charging mode value is the fast charging mode (S2204).

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 (S2205). 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.

As a result of step 2104, if the wireless power transmitter is not in the fast charging mode (i.e., the general low power charging mode), the wireless power transmitter can perform charging in the general low power charging mode (S2206).

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

Referring to Figure 23, 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 (S2301).

At this time, the wireless power transmitter can determine whether fast charging is possible (S2302).

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 (S2303).

The wireless power transmitter can fix the operating frequency and perform wireless charging in a fast charging mode after a predetermined time elapses (S2304).

As a result of the determination in step 2302, 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, (S2305 to S2306).

24 is a diagram for explaining a wireless charging method on a wireless charging system according to another 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 transmitter 2420 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 (S2404).

When the wireless power transmitter 2410 receives the stable control error packets continuously more than a predetermined number, the wireless power transmitter 2410 can switch to the fast charge mode at the same time and fix the operation frequency to start the fast charge (S2405). Here, the charge mode change stable control error packet count value is determined or determined by the wireless power receiver 2420, as shown in FIG. 17, and then transmitted to the wireless power transmitter 2410 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.

FIG. 25 is a diagram for explaining a wireless charging method in a wireless power transmitter according to another 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 charging mode value is the fast charging mode, the wireless power transmitter changes the operating frequency and generates an AC signal, and then confirm whether the stable control error packet is received (S2505).

At a specific 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 (S2506). The wireless power transmitter may repeat step S2505 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 (S2507). 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 2504, 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 (S2508).

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.

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).

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 (S2604).

At a specific 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 (S2605). The wireless power transmitter can repeat step S2604 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 charging in a fast charging mode by fixing the operating frequency in step S2606. 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 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, (S2607 to S2608).

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.

27 is a block diagram illustrating a structure of a wireless power control apparatus according to an embodiment.

As an example, the wireless power control device may be mounted in a wireless power transmitter.

27, the wireless power control apparatus 2700 includes a power supply unit 2701, a DC-DC converter 2710, a driving unit 2720, a resonant circuit 2730, a sensing unit 2740, And a communication unit 2750.

The power unit 2701 receives the DC power through the external power terminal and transmits the DC power to the DC-DC converter 2710.

The control communication unit 2750 may include the communication unit 630 and the control unit 640 of FIG. That is, the control communication unit 2750 can perform both the functions of the communication unit 630 and the control unit 640 in FIG.

The DC-DC converter 2710 can convert the intensity of the DC power received from the power source 2701 into DC power of a specific intensity. For example, the DC-DC converter 2710 may be configured as a variable voltage generator capable of adjusting the intensity of the voltage, and the intensity of the output DC power may be adjusted according to a predetermined control signal of the control communication unit 2750 .

The driving unit 2720 can convert the output DC power of the DC-DC converter 2710 into AC power and provide it to the resonance circuit 2730.

The driving unit 2720 may include a first switch 2727, a first driving unit 2720a, and a second driving unit 2720b.

The first driver 2720a according to one embodiment may provide AC power when the wireless power transmitter performs charging in a general low power charging mode and the second driver 2720b may provide AC power when the wireless power transmitter charges It is possible to provide AC power. The first driving unit 2720a according to another embodiment may provide AC power when the wireless power transmitter performs charging in any one of the general low power charging mode and the fast charging mode, May provide AC power when the wireless power transmitter performs charging in a fast charge mode.

Hereinafter, the first driver 2720a and the second driver 2720b according to one embodiment will be described in detail.

The control communication unit 1150 may control the output DC power of the DC-DC converter 2710 to be applied to the first driving unit 2720a or the second driving unit 2720b through the control of the first switch 2727. More specifically, when the wireless power transmitter performs charging in the general low-power charging mode of FIGS. 19 to 26, the control communication unit 1150 transmits the output DC power of the DC-DC converter 2710 to the first driver 2720a So that the first switch 2727 can be controlled. At this time, DC power outputted from the DC-DC converter 2710 may be controlled so as not to be applied to the second driver 2720b. When the wireless power transmitter performs charging in the fast charge mode of FIGS. 19 to 26, the control communication unit 1150 controls the DC power of the DC-DC converter 2710 such that the output DC power of the DC-DC converter 2710 is transmitted to the second driver 2720b The switch 2727 can be controlled. At this time, DC power output from the DC-DC converter 2710 may be controlled so as not to be applied to the first driver 2720a.

The first driving unit 2720a may include a second switch 2721, a 1-1 inverter 2722, a 1-2 inverter 2723, and a first AC signal controller 2724.

In the case of the general low-power charging mode, the control communication unit 2750 controls the output DC power of the DC-DC converter 2710 through the control of the second switch 2721 to the 1-1 inverter 2722 or the 1-2 inverter 2723 As shown in Fig. For example, in the general low power charging mode, the control communication unit 2750 determines the intensity of the output power, determines the inverter type of the first driver 2720a to be used for generating the alternating signal based on the determined output power level, The second switch 2721 can be controlled according to the inverter type. Here, the strength of the transmitted power can be determined based on the feedback signal received from the wireless power transmission apparatus. As an example, the feedback signal may include a Control Error Packet defined in the WPC standard.

The control communication unit 2750 outputs the output of the DC-DC converter 2710 when the intensity of the transmission power determined based on the feedback signal exceeds a predetermined threshold value in a state in which the half bridge type 1-1 inverter 2722 is activated It is possible to control the second switch 2721 so that the direct current power is transmitted to the full bridge type second inverter 2722. At this time, DC power outputted from the DC-DC converter 2710 may be controlled so as not to be applied to the 1-1 inverter 2722.

The control communication unit 2750 can determine whether it is necessary to change the power control mode according to the intensity of the transmission power determined in the activated state of any one of the 1-1 th to 1-2 th inverters 2722 and 2723. As a result of the determination, if it is necessary to change the power control mode, the control communication unit 2750 can change the power control mode dynamically by controlling the first AC signal control unit 2724. For example, the power control method of the first AC signal controller 2724 may include a duty cycle control method, a driving frequency control method, a phase shift control method, and the like, but is not limited thereto.

For example, when the half-bridge type 1-1 inverter 2722 is activated, the control communication unit 2750 selects either the duty cycle control scheme or the driving frequency control scheme according to the determined transmission power, Can be performed. On the other hand, when the full bridge type 1-2 inverter 2723 is activated, the control communication unit 2750 selects either the phase shift control method or the driving frequency control method according to the determined transmission power level, Can be performed.

In another example, when the half-bridge type 1-1 inverter 2722 is activated, the control communication unit 2750 selects either the phase shift control scheme or the driving frequency control scheme according to the determined transmission power, Control can be performed. On the other hand, when the full bridge type 1-2 inverter 2723 is activated, the control communication unit 2750 selects either the duty cycle control method or the driving frequency control method according to the determined transmission power level, .

The control communication unit 2750 may control the first AC signal controller 2724 so that the driving frequency is not changed when the power control is performed through the duty cycle control scheme or the phase shift control scheme of the first driver 2720a have.

When the duty cycle corresponding to the intensity of the transmission power determined according to the feedback signal during the power control in the duty cycle control scheme of the first driver 2720a exceeds the predetermined duty cycle upper limit, the control communication unit 2750 controls the duty ratio It is possible to control the AC signal controller 2724 to change from the cycle control system to the drive frequency control system.

The control communication unit 2750 controls the drive of the half bridge type 1-1 inverter 2722 of the first driving unit 2720a while the driving frequency corresponding to the determined transmission power is controlled to be a predetermined drive The first AC signal controller 2724 may be controlled so that the full bridge type first -2 inverter 2723 is activated and the half bridge type first inverter 2722 is inactivated.

The duty cycle control scheme is a wireless power control scheme for controlling the average transmission power during a unit time by controlling the duty rate of the AC power signal in a state where the driving frequency of the first driving unit 2720a is fixed. At this time, the duty rate may have a control range of 10 to 50%, but is not limited thereto.

The driving frequency control method is a wireless power control method of adjusting the operating frequency of the first driving part 2720a to adjust the intensity of power transmitted through the resonant circuit 2730. [ The resonance frequency of the resonance circuit 2730 is changed according to the resonance frequency determined by the capacitance of the capacitor constituting the resonance circuit 2730 and the inductance of the inductor and the matching degree of the operation frequency generated by the first AC signal controller 2724 2730 can be adjusted. For example, when the resonance frequency determined by the resonance circuit 2730 matches the operation frequency generated by the first AC signal controller 2724, the maximum power can be transmitted. For example, the operating range of the first driving unit 2720a may range from 110 KHz to 205 KHz, and 110 KHz may be a resonance frequency at which the output power is maximized.

The phase shift control scheme is a wireless power control scheme for controlling the intensity of transmitted power by adjusting the phase of an AC signal having a specific operating frequency of the first driver 2720a. For example, the phase adjustment range of the first driver 2720a may be a value between 0 and 133 degrees.

The second driving unit 2720b may include a second inverter 2725 and a second AC signal controller 2725.

The second inverter 2725 may be a half bridge type or a full bridge type. More specifically, when the second inverter 2725 is of the full bridge type, the amount of current that is conducted becomes lower than that of the half bridge type, so that the size of the noise current is reduced.

The control communication unit 2750 may determine the intensity of the transmission power in the fast charging mode and cause the second AC signal controller 2726 to perform the power control while the second inverter 2725 is activated. For example, the power control method of the second AC signal controller 2726 may be a phase shift control method, but the present invention is not limited thereto.

For example, when the full bridge type second inverter 2725 is activated, the control communication unit 2750 can perform power control in a phase shift control manner according to the determined transmission power. More specifically, the control communication unit 2750 can control the second AC signal controller 2726 so that the driving frequency is not changed when the power control is performed through the phase shift control method of the second driving unit 2720b . Therefore, the embodiment can stably control power in high-speed wireless charging.

The phase shift control scheme is a wireless power control scheme for controlling the intensity of transmitted power by adjusting the phase of an AC signal having a specific operating frequency of the second driver 2720b. For example, the phase adjustment range of the second driver 2720b may be a value between 0 and 133 degrees. The specific operating frequency may be a fixed operating frequency when charging is performed in the fast charge mode of FIGS. 21-26.

The resonant circuit 2730 may be configured to include at least one capacitor and at least one inductor configured to have a specific resonance frequency and having a specific impedance value.

When there are a plurality of transmission coils included in the resonance circuit 2730, the resonance circuit 2730 can be configured such that the impedance values of the transmission coils are the same irrespective of the arrangement structure of the transmission coils.

The control communication unit 2750 can demodulate the in-band signal received from the wireless power receiver. For example, the control communication unit 2750 may demodulate the control error packet received at a predetermined period after entering the power transmission step 440 or 560, and may determine the intensity of the transmission power based on the demodulated control error packet.

The control communication unit 2750 may modulate the packet to be transmitted to the wireless power receiver and transmit it to the resonance circuit 2730. [ For example, when the FOD state packet is received in the negotiation step 540, the control communication unit 2750 generates a predetermined response packet indicating whether to perform the FO detection procedure based on the quality factor value, modulates it, ).

Here, if the response packet is an ACK packet, it means that the wireless power transmission apparatus performs a foreign matter detection process based on the quality factor value. On the other hand, if the response packet is a NACK packet, it means that the foreign substance detection procedure based on the quality factor value is not performed. The wireless power transmission device can identify whether or not it is possible to detect foreign matter based on the quality factor value based on the installed software version and the installed hardware version.

The sensing unit 2740 can measure voltage, current, power, temperature, and the like at a specific node, a specific part, and a specific position of the wireless power transmission apparatus. For example, the sensing unit 2740 may measure the current / voltage / power between the DC-DC converter 2710 and the driver 2720 and may transmit the measurement result to the control communication unit 2750. In another example, the sensing unit 2740 may measure the intensity of the current flowing in the inductor of the resonant circuit 2730 and the intensity of the voltage applied to the capacitor, and may transmit the measurement result to the control communication unit 2750.

FIG. 28 is a block diagram for explaining the detailed structure of the first AC signal controller 2724 of FIG. 27; FIG.

28, the first AC signal controller 2724 includes a phase shift unit 2810, an operating frequency generation unit 2820, a duty cycle control unit 2830, A gate driver 2840, and a controller 2850. The gate driver 2840 includes a gate driver 2840,

The control unit 2850 may communicate with the control communication unit 2750 and may control the lower module according to a control signal of the control communication unit 2750. Here, the lower module includes a phase shift unit 2810, an operating frequency generation unit 2820, a duty cycle control unit 2830, and a gate driver 2840 ).

The phase shifter 2810 can adjust the phase of the AC signal generated by the operation frequency generator 2820. The phase adjusted ac signal may be passed to the gate driver 2840. As an example, the phase adjustment range may be a value between 0 and 133 degrees.

The operation frequency generator 2820 may generate an AC signal having a specific operating frequency according to a control signal of the controller 2850. The generated AC signal may be transmitted to any one of a phase shift unit 2810, a duty cycle adjusting unit 2830 and a gate driver 1240. For example, the operating frequency range adjustable by the operating frequency generator 2820 may range from 110 KHz to 205 KHz, and 110 KHz may be the resonance frequency at which the intensity of the transmitted power is maximum. In this case, when the half-bridge type inverter is activated, the operating frequency control range of the operating frequency control method is a value between 172 kHz and 205 kHz. When the full bridge type inverter is activated, the operating frequency control range May be a value between 110 KHz and 172 KHz, but is not limited thereto.

The duty cycle adjuster 2830 can adjust the duty rate of the AC signal generated by the operation frequency generator 2820. [ An alternating signal whose duty rate is adjusted may be transmitted to the gate driver 2840. For example, the adjustment range of the duty rate may be 10 to 50%, but is not limited thereto.

The gate driver 2840 can control a switch provided in the 1-1 inverter 2722 or the 1-2 inverter 2723 based on the input AC signal.

The alternating signal input to gate driver 2840 may be at least one pulse width modulated signal, but is not limited thereto.

29 is a diagram for explaining the basic operation principle of an inverter for converting a DC signal into an AC signal according to an embodiment.

The driving unit 2720 of FIG. 28 may include a half bridge type inverter and a full bridge type inverter.

Referring to reference numeral 29a, the half bridge inverter includes two switches S1 and S2, and the output voltage Vo can be changed according to the switch ON / OFF control of the gate driver. For example, when the S1 switch is short-circuited and the S2 switch is open, the output voltage Vo has a value of + Vdc, which is the input voltage. On the other hand, when the S1 switch is opened and the S2 switch is short-circuited, the output voltage Vo has a value of zero. The half bridge inverter 13a can output an AC waveform having the corresponding period when the switches S1 and S2 are short-circuited at predetermined intervals.

29, the full bridge inverter may include four switches S1, S2, S3, and S4, and the output voltage Vo may be controlled according to the switch ON / OFF control of the gate driver. The level may have a value of + Vdc or -Vdc or 0, as shown in the table included in figure 29b. For example, when the S1 switch and the S2 switch are short-circuited and the remaining switches are opened, the output voltage Vo level has a value of + Vdc. On the other hand, when the S3 switch and the S4 switch are short-circuited and the remaining switches are opened, the output voltage Vo has a value of -Vdc.

30 is an equivalent circuit diagram of a wireless power transmission apparatus equipped with a half bridge type inverter according to an embodiment.

The half bridge type inverter of FIG. 30 may be the 1-1 inverter 2722 of FIG.

For convenience of explanation, a half bridge type inverter is used in combination with the first inverter.

Referring to FIG. 30, the first inverter 3020 may include a first switch 3021 and a second switch 3022. The first inverter 3020 is connected to the resonance circuit 3030 composed of the capacitor 3031 and the inductor 3032. The DC power supplied from the power source 3010 may be converted into an AC signal through switch control of the first inverter 3020 and transmitted to the resonance circuit 3030.

30, a wireless power transmission apparatus having a resonant circuit 3030 including one capacitor 3031 and one inductor 3032 has been described as an example, but this is only an example , The number of capacitors and inductors constituting the resonant circuit 3030, and the circuit configuration thereof may differ depending on the design purpose of those skilled in the art.

31 is an equivalent circuit diagram of a wireless power transmission apparatus equipped with a full bridge type inverter according to an embodiment.

The full bridge type inverter of FIG. 31 may be the 1-2 inverter 2723 or the second inverter 2725 of FIG.

For the sake of convenience, the full bridge type inverter is used in combination with the second inverter.

Referring to FIG. 31, the second inverter 3120 may include first to fourth switches 3121, 3122, 3123, and 3124. The second inverter 3120 is connected to a resonant circuit 3130 composed of a capacitor 3131 and an inductor 3132. The DC power supplied from the power source 3110 may be converted into an AC signal through switch control of the second inverter 3120 and transmitted to the resonance circuit 3130.

31, a wireless power transmission apparatus having a resonant circuit 3130 including one capacitor 3131 and one inductor 3132 has been described as an example, , The number of capacitors and inductors constituting the resonant circuit 3130, and the circuit configuration thereof may be different depending on the design purpose of the person skilled in the art.

32 is a flowchart for explaining a wireless power control method for wireless charging in a general low-power charging mode according to an embodiment.

Referring to FIG. 32, the wireless power transmission apparatus can perform wireless charging in any one of the general low-power charging mode and the fast charging mode according to FIGS. 19 to 26 (S3201 and S3202).

If the general low power charging mode is selected, the wireless power transmission device will generate an inverter type for AC signal generation based on the initial transmission power intensity determined based on the category of the wireless power receiver and / or the required power information received via the feedback channel And can activate the inverter (S3203). Here, the feedback channel may be an in-band communication channel that uses the same frequency band as the frequency band used for the wireless power transmission, but is not limited thereto. For example, the feedback channel may be a short- Or a communication channel.

When a predetermined feedback signal requesting power control via the feedback channel is received, the wireless power transmission apparatus can determine the strength of the transmission power based on the received feedback signal (S3204).

The wireless power transmission apparatus can determine whether the strength of the determined transmission power can be supported by the currently activated inverter type (S3205).

As a result of the determination, if the support is not possible, the wireless power transmission apparatus can newly determine the inverter type and the power control scheme corresponding to the determined transmission power level (S3206). At this time, the wireless power transmission apparatus can generate the AC signal using the newly determined inverter type, and can control the intensity of the output power according to the newly determined power control method and feedback signal.

As a result of the determination in step S3205, if it is supported, the wireless power transmission apparatus can determine whether it is necessary to change the power control scheme (S3207). Here, the wireless power transmission apparatus can determine whether it is necessary to change the power control mode by checking whether the intensity of the transmission power determined in step S3204 is an adjustable intensity through the currently active power control scheme.

As a result of the determination, if it is necessary to change, the wireless power transmission apparatus newly determines a power control scheme corresponding to the determined transmission power, and performs power control by changing the currently active power control scheme to a newly determined power control scheme (S3208).

If it is determined in step S3207 that no change is required, the wireless power transmission apparatus may return to step S3204.

33 is a flowchart for explaining a wireless power control method for wireless charging in a general low-power charging mode according to another embodiment.

Referring to FIG. 33, the wireless power transmission apparatus can perform wireless charging in any one of the general low-power charging mode and the fast charging mode according to FIGS. 19 to 26 (S3301 and S3302).

When the general low power charging mode is selected, the wireless power transmission apparatus can determine the intensity of the transmission power based on the first received feedback signal after entering the power transmission step (S3303).

The wireless power transmission apparatus can determine the inverter type corresponding to the determined transmission power level (S3304).

The wireless power transmission apparatus may determine a power control scheme supporting the determined transmission power intensity among the selectable power control schemes corresponding to the determined inverter type (S3305).

Thereafter, the wireless power transmission apparatus may determine the intensity of the transmission power based on the periodically received feedback signal (S3306).

The wireless power transmission apparatus can determine whether the intensity of the transmission power determined in step S3306 is within a predetermined power adjustment range corresponding to the determined power control scheme (S3307).

As a result of the determination, if the power control range is exceeded, the wireless power transmission apparatus can reassign the inverter type and / or the power control scheme corresponding to the intensity of the transmission power determined in step S3306 (S3308).

As a result of the determination in step 3307, if the power control range is within the power control range, the wireless power transmission apparatus can maintain the currently active inverter type and power control scheme and perform step S3306.

FIG. 34 is a view for explaining a method of switching an inverter type and a power control scheme according to a change in transmission power intensity in a general low-power charging mode according to an embodiment.

In a general low power charging mode, the wireless power transmission apparatus can determine the intensity of the output power and determine the inverter type and the power control scheme based on the determined output power level, when a feedback signal requesting power control is received.

Hereinafter, a method of switching the inverter type and the power control method according to the intensity of the transmission power determined based on the feedback signal during the passage of time from the first time point to the fourth time point after entering the power transmission step will be described in detail.

Referring to FIG. 34, if the intensity of the transmission power determined by the feedback signal received at the first time point is A, the wireless power transmission apparatus can determine the inverter type as a half bridge and the power control method as a duty cycle control method have.

When the intensity of the transmission power determined by the feedback signal received at the second time point is B, the inverter type is maintained as a half bridge, and the power control method can be switched from the duty cycle control method to the operation frequency control method.

When the intensity of the transmission power determined by the feedback signal received at the third time point is C, the inverter type corresponding to the determined transmission power level is the full bridge, so that the wireless power transmission device switches the inverter type from the half bridge to the full bridge And the power control method can be determined by the phase shift control method.

When the intensity of the transmission power determined by the feedback signal at the fourth time point is D, the wireless power transmission apparatus can maintain the inverter type as a full bridge, and the power control method can switch from the phase shift control method to the operation frequency control method .

FIG. 35 is a flowchart illustrating a method of controlling wireless power in a state where a half bridge is activated in a general low power charging mode according to an embodiment.

Referring to FIG. 35, in the general low power charging mode, the wireless power transmission apparatus can determine the intensity of the transmission power based on the feedback signal received when the half bridge is activated (S3501 to S3502). As an example, the feedback signal may be a control error packet defined in the WPC standard and may be received periodically in the power transmission phase.

The wireless power transmission apparatus can confirm whether the currently active power control scheme is the duty cycle control scheme (S3503).

If the currently active power control scheme is the duty cycle control scheme, the wireless power transmission apparatus can determine whether the duty rate corresponding to the determined transmission power is less than the predetermined lower limit of the duty rate adjustment (S3504). As an example, the duty rate adjustment range may be a value between 10% and 50%. When the duty cycle control scheme is activated, the smallest power is delivered when the duty rate is set to 50%, and the largest power can be delivered when the duty rate is set to 10%.

When the duty rate corresponding to the intensity of the transmission power determined based on the feedback signal is less than the predetermined lower limit value of the duty ratio in the active state of the duty cycle control scheme, the wireless power transmission apparatus performs the power control scheme in the duty cycle control scheme, (S3505).

The wireless power transmission apparatus may determine the intensity of the transmitted power based on the feedback signal received when the operation frequency control method is activated (S5306).

The wireless power transmission apparatus can determine whether the operating frequency corresponding to the transmitted power determined in step 3506 is less than a predetermined lower limit of the operating frequency control in step S3507.

As a result of the determination, if the predetermined lower limit of the operating frequency is smaller than the lower limit, the wireless power transmission apparatus can convert the inverter type to the full bridge type (S3508).

If it is determined in step S3507 that the operating frequency corresponding to the determined transmission power is greater than the lower limit of the predetermined operation frequency, the wireless power transmission apparatus determines whether the operating frequency corresponding to the determined transmission power is higher than the predetermined upper limit (S3509).

As a result of the determination, if the operation frequency corresponding to the determined transmission power is greater than the upper limit of the operation frequency, the wireless power transmission apparatus can switch the power control scheme from the operation frequency control scheme to the duty cycle control scheme (S3510).

As a result of the determination in step S3509, if the upper limit of the operating frequency is less than the upper limit of the operating frequency, the wireless power transmission apparatus can perform the power control through the operation frequency control method by entering S3506.

If it is determined in step S3503 that the currently active power control scheme is not a duty cycle control scheme, the wireless power transmission apparatus may perform step S3507 described above.

FIG. 36 is a flowchart illustrating a method of controlling wireless power in a state where a full bridge is activated in a general low-power charging mode according to an embodiment.

Referring to FIG. 36, in the general low power charging mode, the wireless power transmission apparatus can determine the intensity of the transmission power based on the feedback signal periodically received in the full bridge enabled state (S3601 to S3602).

The wireless power transmission apparatus can confirm whether the currently active power control scheme is a phase shift control scheme (S3603).

If the currently active power control scheme is the phase shift control scheme, the wireless power transmission apparatus can determine whether the phase shift corresponding to the determined transmission power is out of the predetermined phase shift control range (S3604). For example, the phase adjustment range may be between 0 and 133 degrees, and if the phase shift to be adjusted is less than 0 degrees or greater than 133 degrees, which corresponds to the determined transmit power, It can be judged that it is out of the range.

As a result of the determination, if the phase shift control range is exceeded, the wireless power transmission apparatus can convert the power control scheme from the phase shift control scheme to the operation frequency control scheme (S3605).

The wireless power transmission apparatus can determine the intensity of the transmission power based on the feedback signal received when the operation frequency control scheme is activated (S3606).

The wireless power transmission apparatus can determine whether the operation frequency corresponding to the intensity of the transmission power determined in step 3606 is less than the lower limit of the predetermined operation frequency adjustment in step S3607.

As a result of the determination, if the wireless power transmission apparatus is smaller than the lower limit of the predetermined operation frequency regulation, the wireless power transmission apparatus can determine whether wireless charging can be performed in the fast charging mode according to FIGS. 19 to 26 (S3608).

If it is determined that wireless charging can be performed in the fast charging mode, the wireless power transmitting apparatus can perform wireless charging in the fast charging mode (S3609).

As a result of the determination in step S3608, if the wireless charging can not be performed in the fast charging mode, the wireless power transmission apparatus can output a predetermined warning alarm signal indicating that the maximum transmission power has been reached (S3610). Here, the warning alarm signal may be output using an alarm such as a lamp, a buzzer, a vibration, a liquid crystal display, and / or a display means, but is not limited thereto.

If it is determined in step 3607 that the operating frequency corresponding to the determined transmission power is greater than the lower limit of the predetermined operating frequency, the wireless power transmission apparatus determines whether the operating frequency corresponding to the determined transmission power is higher than the predetermined upper limit (S3611).

As a result of the determination, if it is smaller than the upper limit of the operating frequency, the process may return to step S3606.

As a result of the determination in step S3611, if the operating frequency corresponding to the determined transmission power is greater than the upper limit of the operating frequency, the wireless power transmission apparatus can switch the power control scheme from the operating frequency control scheme to the phase shift control scheme (S3612).

If it is determined in step S3603 that the currently active power control scheme is not a phase shift control scheme, the wireless power transmission apparatus may perform step S3607 described above.

FIG. 37 is a block diagram for explaining the detailed structure of the second AC signal controller 2726 of FIG. 27; FIG.

37, the second AC signal controller 2726 includes a phase shift unit 3710, an operating frequency generation unit 3720, a gate driver 3730, and a controller A controller 3740, and the like.

The control unit 3740 communicates with the control communication unit 2750 and can control the lower module according to the control signal of the control communication unit 2750. Here, the lower module includes the phase shift unit 3710, an operating frequency generation unit 3720, and a gate driver 3730.

The phase shifter 3710 can adjust the phase of the AC signal generated by the operation frequency generator 3720. The phase adjusted ac signal may be passed to the gate driver 3730. As an example, the phase adjustment range may be a value between 0 and 133 degrees.

The operation frequency generator 3720 can generate an AC signal having a specific operating frequency according to the control signal of the controller 3740. The generated AC signal may be transmitted to a phase shift unit 3710. The specific operating frequency may be a fixed operating frequency when charging is performed in the fast charge mode of FIGS. 21-26.

The gate driver 3740 may control a switch provided in the second inverter 2725 based on the input AC signal.

The alternating signal input to the gate driver 3740 may be at least one pulse width modulated signal, but is not limited thereto.

FIG. 38 is a diagram for explaining a power control method according to a change in transmission power intensity in a fast charge mode according to an embodiment.

In the fast charge mode, when a feedback signal requesting power control is received, the wireless power transmission apparatus can determine the intensity of the transmission power and control the power in a phase shift control manner based on the determined transmission power.

Hereinafter, the power control method will be described in detail according to the intensity of the transmission power determined based on the feedback signal after entering the power transmission step.

Referring to FIG. 34, in the fast charging mode, the wireless power transmission apparatus can fix the transmission power by fixing the transmission power at a specific operating frequency (F_fix) and varying the phase according to the determined transmission power.

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. In addition, in the embodiment, when the full bridge type is used, the amount of current to be conducted is reduced as compared with the case of the half bridge type, so that the size of the noise current is reduced. Also, the embodiment can control the wireless charging power stably by controlling the transmission power in a phase shift manner in the high-speed wireless charging.

FIG. 39 is a flowchart for explaining a method of controlling radio power in a full-bridge activated state in the fast-charge mode according to an embodiment.

Referring to FIG. 39, the wireless power transmission apparatus can perform wireless charging in any one of the general low-power charging mode and the fast charging mode according to FIGS. 19 to 26 (S3901 and S3902).

When the fast charge mode is selected, the wireless power transmission apparatus can be fixed at a predetermined operating frequency (S3903). The predetermined operating frequency may be a fixed operating frequency when charging is performed in the fast charging mode of FIGS.

When fixed to a predetermined operating frequency, the wireless power transmission apparatus can activate the full bridge (S3904).

With the full bridge active, the wireless power transmission device may determine the intensity of the transmitted power based on the periodically received feedback signal (S3905).

It can be confirmed whether the intensity of the determined transmission power is within the power control range (S3906).

As a result of checking, if the power control range is within the range, the wireless power transmission apparatus can control power by a phase shift control method based on the determined transmission power (S3907). Then, the above-described step S3905 may be repeated.

In step S3906, if the power control range is not satisfied, the wireless power transmission apparatus can determine whether the intensity of the determined transmission power is equal to or greater than the maximum transmission power (S3908).

If the determined sending power is greater than the maximum sending power, the wireless power transmitting apparatus can output a predetermined warning alarm signal indicating that the maximum sending power has been reached (S3909). Here, the warning alarm signal may be output using an alarm such as a lamp, a buzzer, a vibration, a liquid crystal display, and / or a display means, but is not limited thereto.

If it is determined in step S3908 that the determined transmission power is not higher than the maximum transmission power, the wireless power transmission apparatus can perform charging in the general low power charging mode (S3910).

In step S3902, if the charging is not performed in the fast charging mode, the wireless power transmitting apparatus can perform charging in the normal low-power charging mode (S3910).

40 is a view for explaining a wireless charging transmission coil according to an embodiment.

Referring to FIG. 40, 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. 40, the first coil 4010 and the second coil 4020 are arranged on the first layer side by side at a predetermined interval on the shielding material 4040, and the third coil 4030 is disposed on the first coil and the second coil And can be superimposed on the second layer.

The first coil 4010, the second coil 4020 and the third coil 4030 may be manufactured according to the standard of a coil defined by WPC or PMA and may be manufactured to the same extent can do.

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

[Table 1]

The first coil 4010, the second coil 4020 and the third coil 4030 correspond to the outer length defined in Table 1, Inner length, outer width, inner width, thickness, and winding. Of course, the first coil 4010, the second coil 4020, and the third coil 4030 may have the same physical characteristics within an error range by the same manufacturing process.

However, as shown in FIG. 21, each of the first coil 4010, the second coil 4020, and the third coil 4030 may have different values of inductance measured depending on the position where the first coil 4010, the third coil 4020, and the third coil 4030 are disposed.

For example, the first coil 4010 and the second coil 4020 satisfy the specifications of Table 1 and have an inductance of 12.5 uH, and the third coil 4030 has a distance from the shielding material to the first coil 4030. [ May have an inductance that is less than 12.5uH different from the second coil 4010 and the second coil 4020. [

For example, the first coil 4010 and the second coil 4020 are disposed in contact with the shielding material, but the third coil 4030 may be disposed apart from the shielding material by a predetermined height.

In one embodiment, an adhesive may be disposed between the first coil 4010, the second coil 4020, or the third coil 4030 and the shielding material.

Therefore, in an embodiment, the third coil 4030 has a larger number of turns than the turns of the first coil 4010 and the second coil 4020 in order to have the same inductance as the first coil 4010 and the second coil 4020, (For example, 0.5 times or 1 time or 2 times).

In one embodiment, the third coil 4030 may have 12.5 times or 13 times or 14 times of turns.

In other words, the centrally located third coil 4030 is located farther away from the shield than the first coil 4010 and the second coil 4020 and the measured inductance is greater than the inductance measured by the first coil 4010 and the second coil 4020 So that the length of the conductor constituting the third coil 4030 can be made longer than that of the first coil 4010 and the second coil 4020 so that the inductance can be adjusted to be the same.

The length of the conductor constituting the third coil 4030 is made slightly longer than that of the first coil 4010 and the second coil 4020 so that the third coil 4030 is connected to the first coil 4030, The inductance of the three coils may be equal to 12.5uH although the second coil 4020 and the second coil 4020 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.

41 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.

41, when three coils included in a wireless power transmitter have different inductances, three drive circuits 4110 connected to respective coils and three capacitors including a capacitor for generating the same resonance frequency An LC resonance circuit 4120 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 4120 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 4110 including an inverter for applying an AC voltage to each LC resonant circuit 4120 are also required.

42 is a diagram for describing a wireless power transmitter including a plurality of coils according to an embodiment and including one drive circuit;

42, if the inductances of the three coils of the wireless power transmitter are the same, the wireless power transmitter may include only one drive circuit 4210 and may include one drive circuit 4210 and three coils, The switch 4230 can be controlled so as to connect the coil of the wireless power transmitter having the highest power transmission efficiency with the coil of the wireless power transmitter.

Compared with FIG. 41, the wireless power transmitter can reduce the area occupied by the components by using only one drive circuit 4210, 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 4230 to identify the coil of the high power wireless power transmitter and connect it to the drive circuit 4210.

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

43, the power transmission unit includes a drive circuit 4310 for converting an input voltage, a switch 4320 for connecting the drive circuit 4310 and the LC resonance circuit, a plurality of transmission coils 4330, a plurality of One capacitor 4340 connected in series with the coil of the switch 4320, and a controller 4350 for controlling the opening and closing of the switch 4320.

The control unit 4350 identifies the coils of the wireless power receiver among the plurality of coils 4330 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 4310, 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 (32)

A power transmission section including at least one transmission coil;
A power converter for converting the intensity of DC power applied from the outside;
A driving unit that converts DC power applied from the power conversion unit to AC power using one or more inverters and provides the AC power to the one or more transmission coils;
A communication unit for exchanging information with an external device; And
And a control unit for controlling the charging mode based on the charging mode packet received through the communication unit,
Wherein the inverter is a full bridge type if the charging mode is a fast charge mode. The method according to claim 1,
Wherein the control unit switches the normal low power charging mode set to the default to the fast charging mode to perform charging if the charging mode value included in the charging mode packet is a value corresponding to the fast charging mode. 3. The method of claim 2,
Wherein the charge mode packet further comprises a charge mode change operating frequency value. The method of claim 3,
Wherein the charge mode change operating frequency is a predetermined operating frequency that is fixed when generating an alternating current signal in a fast charge mode. 5. The method of claim 4,
Wherein the charge mode change operating frequency is a predetermined radio power transmitter. 6. The method of claim 5,
Wherein the charging mode change operating frequency is an operating frequency at which the AC power is stably generated at the end of wireless charging before the start of wireless charging. 3. The method of claim 2,
Wherein the controller switches to the fast charge mode and performs charging when generating the AC power stably in the normal low power charge mode. 3. The method of claim 2,
Wherein the charge mode packet further comprises a charge mode change stable control error packet count value. 9. The method of claim 8,
Wherein the stable control error packet is a control error value of the control error packet is zero. 10. The method of claim 9,
Wherein the controller switches from the normal low-power charging mode to the fast-charging mode to perform charging when the number of consecutively received stable control error packets is equal to or greater than the count value of the stable mode control error packet count. 8. The method of claim 7,
Wherein the controller sets the operating frequency fixed when generating the AC signal in the fast charging mode to the operating frequency when generating the AC power stably in the normal low-power charging mode. 11. The method of claim 10,
Wherein the control unit sets the operating frequency fixed when generating the AC signal in the fast charging mode to an operating frequency when the number of consecutively received stable control error packets is equal to or greater than the count value of the stable mode control error packet count . The method according to claim 1,
Wherein the driving unit further includes an AC signal controller for adjusting an AC power output from the inverter based on a predetermined control signal of the controller. 14. The method of claim 13,
Wherein the driving unit further includes an AC signal controller for adjusting an AC power output from the inverter based on a predetermined control signal of the controller. 15. The method of claim 14,
The AC signal control unit includes:
An operation frequency generating unit for generating an AC signal having a specific operating frequency; And
And a phase shifting unit adjusting the phase of the AC signal to adjust an intensity of an average transmission power output from the transmission coil. The method according to claim 1,
Wherein the power transmission unit includes a plurality of transmission coils,
And a multiplexer for controlling the power converted by the power converting unit or the driving unit to be transmitted to any one of the plurality of transmitting coils. Receiving coil;
A communication unit for demodulating a signal received through the reception coil to extract a packet; And
And a controller for receiving the extracted packet from the private communication unit to identify whether or not the external device is capable of fast charging and determining whether a change of the charging mode currently being performed is necessary,
If it is necessary to change the charging mode, the control unit generates a predetermined charging mode packet including a charging mode value to be changed and transmits the packet to the external device through the communication unit,
Wherein the control unit switches the normal low power charging mode set to the default to the fast charging mode to perform charging if the charging mode value included in the charging mode packet is a value corresponding to the fast charging mode. 18. The method of claim 17,
Wherein the charge mode packet further comprises a charge mode change operating frequency value. 19. The method of claim 18,
Wherein the charge mode change operating frequency is a predetermined operating frequency that is fixed when generating an alternating current signal in a fast charge mode. 20. The method of claim 19,
Wherein the charge mode change operating frequency is predetermined. 20. The method of claim 19,
Wherein the charging mode change operating frequency is an operating frequency at which the AC power was stably generated at the end of wireless charging before the start of wireless charging. 18. The method of claim 17,
Wherein the control unit switches to the fast charge mode and performs charging when generating the AC power stably in the normal low power charging mode. 18. The method of claim 17,
Wherein the charge mode packet further comprises a charge mode change stable control error packet count value. 24. The method of claim 23,
Wherein the stable control error packet is a control error value of a control error packet. 25. The method of claim 24,
Wherein the controller switches from the normal low-power charging mode to the fast-charging mode to perform charging when the number of consecutively received stable control error packets is equal to or greater than the count value of the stable mode control error packet count. 24. The method of claim 23,
Wherein the controller sets the operating frequency fixed when the AC signal is generated in the fast charging mode to the operating frequency when the AC power is stably generated in the normal low-power charging mode. 26. The method of claim 25,
Wherein the control unit sets the operating frequency fixed when the AC signal is generated in the fast charging mode to an operating frequency when the number of consecutively received stable control error packets is equal to or greater than the charging mode changeable stable control error packet count value . A wireless charging method in a wireless power receiver that receives power wirelessly from a wireless power transmitter,
Collecting receiver state information in a power transmitting step;
Determining whether a change of the charging mode is necessary based on the collected receiver state information; And
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,
Wherein the charge mode packet includes a charge mode change operating frequency value or a charge mode change control stability error packet count value. A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,
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
And switching to a charging mode corresponding to the charging mode value to perform charging,
Wherein the charging mode is switched to the charging mode corresponding to the charging mode value, and the charging is performed in the fast charging mode by fixing the operating frequency after a predetermined time elapses in the fast charging mode. A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,
Receiving a charge mode packet in which the charge mode value is set to a value corresponding to the fast charge mode;
Determining whether the fast charge mode is supported;
Transmitting a predetermined first packet to the wireless power receiver indicating that the fast charge mode is supported if the fast charge mode is supported; And
Fixing the operating frequency in a fast charging mode and performing wireless charging after a predetermined time elapses;
And transmitting a second packet indicating that the fast charge mode is not supported if the fast charge mode is not supported. A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,
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;
Confirming that the charge mode value is a fast charge mode;
If the charging mode value is the fast charging mode, changing the operating frequency and generating an AC signal and confirming whether the stable control error packet is received;
Confirming at a particular operating frequency that a stable control error packet is received that the number of consecutively received stable control error packets is greater than or equal to a predetermined value;
And if the counted number of consecutively received stable control error packets is greater than or equal to a predetermined value, fixing the operating frequency in a fast charging mode and performing charging. A wireless charging method in a wireless power transmitter for wirelessly transmitting power to a wireless power receiver,
Receiving a charge mode packet in which the charge mode value is set to a value corresponding to the fast charge mode;
Determining whether the fast charge mode is supported;
Transmitting a predetermined first packet to the wireless power receiver indicating that the fast charge mode is supported if the fast charge mode is supported;
Changing an operating frequency and generating an AC signal and confirming whether a stable control error packet is received;
Confirming at a particular operating frequency that a stable control error packet is received that the number of consecutively received stable control error packets is greater than or equal to a predetermined value; And
And if the counted number of consecutively received stable control error packets is greater than or equal to a predetermined value, fixing the operating frequency in a fast charging mode and performing charging.

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