KR20180073246A - Apparatus for transmitting wireless power, apparatus for receiving wireless power, system having a same and operating method thereof - Google Patents

Abstract

The present embodiment relates to a wireless power transmission technique, and more specifically, to a wireless power transmission device and a wireless power receiving device, and an operating method thereof. According to an embodiment, the wireless power transmission device comprises: a power transmission unit including at least one transmission coil; a power conversion unit converting the strength of power applied from the outside; a storage unit storing external device information to which the wireless power receiving device can be connected; a communication unit which communicates with the wireless power receiving device; and a control unit controlling a charging mode and a charging power amount with respect to the wireless power receiving device, and controlling the external device information to be transmitted to the wireless power receiving device. According to the present invention, a selective charge time and efficiency can be provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission apparatus and a wireless power reception apparatus, and a method of operating the wireless power transmission apparatus and a wireless power reception apparatus.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technology, and more particularly, to a wireless power transmission device and a wireless power reception device and a method of operation thereof.

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, it is impossible to execute various applications that meet the user's demand during wireless charging, or when the load of the receiver or the wireless power transmitting apparatus is increased when some applications are executed, the efficiency of wireless power transmission may be lowered or the charging effect may be lowered There was a problem.

The embodiments of the present invention are intended to solve the problems of the prior art described above, and the object of the present invention is to provide a wireless power transmission apparatus and a wireless power reception apparatus and a method of operation thereof.

Another object of the present invention is to provide a wireless power transmission apparatus and a wireless power reception apparatus and a method of operating the wireless power transmission apparatus, which enable devices to be charged to execute various applications even during wireless charging.

It is another object of the present invention to provide a wireless power transmission apparatus and a wireless power reception apparatus and a method of operating the wireless power transmission apparatus and the wireless power reception apparatus that can perform various applications while minimizing the operation load of the wireless power transmission apparatus and the wireless power reception apparatus even during wireless charging .

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

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including a power transmission unit including at least one transmission coil, a power conversion unit for converting an intensity of power applied from the outside, A communication unit that communicates with the wireless power receiving apparatus, a control unit that controls a charging mode and a charging power amount for the wireless power receiving apparatus, and controls the wireless power receiving apparatus to transmit the external apparatus information And a control unit for controlling the transmission of the data.

Also, a wireless power receiving apparatus according to an embodiment of the present invention includes: a receiving coil; a communication unit for demodulating a signal received through the receiving coil to extract a packet; And a control unit for receiving the extracted packet from the communication unit and identifying information of a connectable external device, and the communication unit outputs the identified external device information to the electronic device.

The wireless power transmission method may further include controlling a charging mode and a charging power for the wireless power receiving apparatus, and transmitting the stored external apparatus information to the wireless power receiving apparatus during the power transmitting step And the external device field is transmitted via in-band communication or out-of-band communication.

The wireless power receiving method may further include receiving external device information received from the wireless power transmitting device in the power transmitting step, identifying the received external device information, and transmitting the received external device information to the electronic device, Wherein the external device information is received via in-band communication or out-of-band communication.

Effects of the wireless power transmission apparatus and wireless power reception apparatus and the operation method thereof according to the present embodiment will be described as follows.

The present embodiment is advantageous in providing a wireless power transmission apparatus and a wireless power reception apparatus and an operation method thereof.

It is also possible that this embodiment provides a typical charge or fast charge to provide an optional charge time and efficiency.

In addition, the present embodiment can minimize the operational load on the wireless power transmission apparatus even during wireless charging, and enable a receiver including the wireless power reception apparatus to execute various applications.

Also, in the present embodiment, it is possible to perform wireless charging with a high efficiency while minimizing the operation load of the wireless power receiving apparatus even during wireless charging, and to enable the receiver to execute various applications.

In addition, in the present embodiment, a multi-tasking can be performed by allowing a wireless charging middle-range receiver to execute various applications.

Also, in this embodiment, various applications and various operations required by the user can be performed even during wireless charging, thereby enhancing convenience for the user.

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 wireless charging method in a wireless power transmitter according to an embodiment.
15 is a diagram for explaining a wireless charging method in a wireless charging system according to an embodiment.
16 is a diagram for explaining a wireless charging method in a wireless power receiver according to another embodiment.
17 is a diagram for explaining a wireless charging method in a wireless charging system according to another embodiment.
18 is a diagram for explaining the operation of an electronic device including a wireless power receiver according to another embodiment.
19 is an exemplary diagram for explaining a connection state of the wireless charging system according to the embodiment.
20 is a view for explaining a wireless charging transmission coil according to an embodiment.
21 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.
22 is a diagram illustrating a wireless power transmitter including a plurality of coils and one drive circuit according to an embodiment.
23 is a view for explaining a plurality of switches 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, (Both below and "front EH after (rear)") are formed such that the two components are in direct contact with each other or one or more other components are disposed between the two components.

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

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

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

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, , A wireless power transmission device, a wireless power transmitter, a wireless charging device, and the like. For the sake of convenience, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver Terminals and the like can be used in combination.

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

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

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

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

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

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

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

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission. The wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may 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 You can do it.

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 mutual status information. Here, the status information and 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 to the wireless power receiving terminal 20 It is possible to do.

Way communication between the wireless power receiving terminal 920 and the wireless power transmitting terminal 10 is possible, but information can be transmitted only by one of the devices 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. The wireless power receiving terminal 20 can output various information acquired from the wireless power transmitting terminal 10 to the electronic device 30. [ As an example, it may include identification information for an external output device to which the electronic device 30 can connect. One example of the identification information may be a MAC address, an IP address (Internet Protocol Address), or the like of an external device. The external device may include a speaker, a display device, and the like.

In particular, the wireless power transmitting terminal 10 according to an exemplary embodiment may provide identifier information or connection information that can be connected to an external device. The wireless power receiving terminal 20 can inform the electronic device 30 when the connected wireless power transmitting terminal 10 provides the information of the pre-registered external device. The electronic device 30 can display information on the external device and whether or not the external device is connected through a predetermined display means, for example, a liquid crystal display. Therefore, the user of the electronic device 30 can select the connection information and connection request button to the external device displayed on the display means. In this case, the wireless power transmitting terminal 10 operates in a wireless charging mode in which the wireless power receiving terminal 20 provides power for charging the electronic device 30, so that the electronic device 30 can transmit data by connecting with the external device To run the application.

The electronic device 3 may also be connected to the wireless power receiver 20 via the wireless power transmitter 10 in accordance with the communication and negotiation results of the wireless power transmitter 10 and the wireless power receiver 20, And automatically connect to the external device based on the information of the external device and the connection information received from the external device.

And may transmit a predetermined packet to the wireless power receiving terminal 20 indicating whether or not to support fast charging. The wireless power receiving terminal 20 can inform the electronic device 30 when the connected wireless power transmitting terminal 10 is confirmed to support the fast charging mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, for example, a liquid crystal display.

Also, the user of the electronic device 3 may select a 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 may 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.

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

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 be composed of a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices are connected to one wireless power transmitting terminal 10, Can be performed. In this case, the wireless power transmitting terminal 10 may 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, the wireless power transmitting terminal 10 may be a wireless power receiving apparatus, However, the present invention is not limited thereto. For example, the wireless power transmitting terminal 10 may use different frequency bands allocated to the wireless power receiving apparatuses So that power can be distributed and transmitted to a plurality of wireless power receiving apparatuses.

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. Particularly, when a plurality of wireless power receiving ends 20 are connected to one wireless power transmitting end 10, the wireless power transmitting end 10 may be all transmitted to a plurality of wireless power receiving ends 20 connected thereto. At this time, the wireless power receiving terminal 20 outputs the information of the external device to be transmitted to each electronic device 30.

As another example, as shown in FIG. 200B, the wireless power transmission terminal 10 may be configured with a plurality of wireless power transmission devices. 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 devices connected to the wireless power receiving terminal 2 is adaptively determined based on the required power amount of the wireless power receiving terminal 2, the battery charging status, the power consumption amount of the electronic device, .

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

For 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 (indicating signal strength packet) can be identified. 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 above reference numerals 110 and 12 of FIG. 3, 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 42, 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. The specific causes and specific events will be apparent from 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.

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

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

In the identifying and configuring step 430, the sender may determine that the power transmission contract is an unexpected packet, a packet is received or an unexpected packet, a desired packet is not received for a predefined period of time (time out), a packet transmission error If no power transfer contract has been set, the process can proceed to the selection step 410. In step 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.

Also, in the power transmission step 440, the transmitter can transmit information including the address of the previously stored external device, connection information, communication environment, etc. to the receiver.

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. Also, the sensing unit 650 may measure the internal temperature of the wireless power transmitter 600 for determining whether the overheating occurs, and may provide the measurement result to the controller 640. For example, the controller 640 can adaptively block the power supply from the power supply unit 650 or block the power supply to the amplifier 612 based on the voltage / current value measured by the sensing unit 650 have. 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 640 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, intensity information of the rectifier output voltage, 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 (12) received 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 21 to generate AC power. However, this is merely one embodiment, It should be noted that they may be mixed in the previous stage or the following stage.

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.

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. [

Also, the main control unit 770 can receive information for enabling connection with an external device from the connected wireless power transmitter based on the information demodulated by the demodulation unit 760. [ The main control unit 770 may output the input external device information to the control unit for controlling the electronic device based on the input external device information. The main control unit 770 may output the received power packet according to the charging state and the charging operation to the wireless power transmitter and acquire the external device information from the wireless power transmitter based on the received power packet.

FIG. 8 illustrates a method of modulating and demodulating a wireless power signal according to an embodiment of the present invention. Referring to FIG.

8, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can encode or decode a packet to be transmitted based on an internal clock signal 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.

1, when the wireless power transmitting terminal 10 or the wireless power receiving terminal 20 does not transmit a specific packet, the wireless power signal is modulated by a 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, the 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 can be defined for each step of the wireless power transmission procedure, and some 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 0x22.

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, a request, or a response to the other party.

The message 930 may also include information data for the external device from the wireless power transmitter 10. At this time, the information data may be included as a report item or a request item. In addition, the wireless power receiver 20 may request external device information from the wireless power transmitter 10. That is, the packet transmitting terminal can request information of the external apparatus or transmit the external apparatus information (wireless power receiving terminal). (Wireless power transmitting terminal)

The packet 900 according to another exemplary embodiment may further include at least one of transmitting end identification information for identifying a transmitting end that transmitted the packet and 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, information that can distinguish the receiver and the transmitter on the wireless charging system suffices.

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

That is, if there are a plurality of packet transmitting terminals (wireless power receivers) for requesting information of the external apparatus, information for identifying the respective packet transmitting terminals may be included. And may include information for identifying each of the packet transmitters when there are a plurality of packet transmitters (wireless power transmitters) for transmitting information of external devices.

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

14, the wireless power transmitter can collect status information of the wireless power receiver (i.e., receiver status information) upon entering the power transmitting step (S1401)

The wireless power transmitter can confirm whether the previously stored external output device information is transmitted based on the collected receiver status information (S1402)

In one example, the receiver status information may include status information about the charging progress. Specifically, it may include state information or operation information of entering the power transmission step and stably receiving power transmitted from the wireless power transmitter. For example, the receiver status information may include information about CPU usage.

In another example, the receiver status information may include application software and peripheral status information.

The wireless power transmitter determines whether transmission of previously stored external output device information is possible based on the status information of the identified receiver (S1403)

If it is determined that the external output device information can be transmitted as a result of the determination, the wireless power transmitter can transmit information on the previously stored external output device to the wireless power receiver (S1404)

Specifically, the external output device information may include connection information such as a MAC address and an IP address. The external output device may include an audio output device or a video output device capable of short-range wireless communication. Preferably an audio, earphone or video display device capable of Bluetooth communication, and the like. However, the present invention is not limited to this, and an electronic device including a wireless power receiver can receive information on various external devices that can be connected by short-range wireless communication.

15 is a diagram for explaining a wireless charging method in a wireless charging system according to an embodiment.

Referring to FIG. 15, the wireless power transmitter 1510 transitions from the identification and configuration phase to the power transfer phase. The wireless power transmitter 1510 may generate and transmit a packet for confirming whether or not information on the previously stored external output device can be transmitted to the wireless power receiver 1520. (S1501) Specifically, The power reception state at the power transmission step is checked and it is confirmed based on the check result whether the electronic device 1530 can transmit information to the connectable external output device.

The wireless power receiver 1520 can transmit the information of the power reception state based on the packet received from the wireless power transmitter 1510. (S1502) The reception state information includes the power reception state, the charge amount information, And the like.

The wireless power transmitter 1510 may send information about the previously stored external output device to the wireless power receiver 1520 based on the received power packet received from the wireless power receiver 1520. [ Specifically, the wireless power transmitter 1510 determines that the wireless power receiver 1520 is receiving wireless power in a steady state based on the received received power packet. Thereafter, information about an external output device connectable with the electronic device 1530 including the wireless power receiver 1520 can be transmitted. At this time, the information on the external output device may include a MAC address or an IP address.

In this manner, the wireless power receiver 1520 outputs information on the external output device received from the wireless power transmitter 1510 to the electronic device 1530 (S1504). At this time, the electronic device 1530 transmits the information 1530 so that the user can easily recognize the information about the external output device.

In this embodiment, the external output device information is transmitted from one wireless power transmitter to one wireless power receiver. However, the present invention is not limited thereto. If there are a plurality of wireless power receivers connected to the wireless power transmission apparatus 1510, the external output apparatus information may be transmitted to a plurality of wireless power receiving apparatuses in accordance with a predetermined priority order or a specified order.

Or a plurality of wireless power transmitters connected to one wireless power receiver, may transmit to the corresponding wireless power receiver external output device information stored in each wireless power transmitter according to a predetermined priority or in a specified order.

16 is a diagram for explaining a wireless charging method in a wireless power receiver according to another embodiment.

Referring to FIG. 16, when the wireless power receiver enters the power transmission step, it transmits status information - that is, receiver status information - to the wireless power transmitter. At this time, the wireless power receiver can request external output device information connectable with the external device during the power transmission step (S1601)

In one example, the receiver status information may include status information about the charging progress. Specifically, it may include state information or operation information of entering the power transmission step and stably receiving power transmitted from the wireless power transmitter. As an example, the receiver status information may include information about CPU usage.

In another example, the receiver status information may include user software and peripheral status information.

The wireless power receiver can request external output device information from the wireless power transmitter and receive external output device information from the wireless power transmitter during the power transmission phase. (S1602) Specifically, The information may include connection information such as a MAC address and an IP address. The external output device may include an audio output device or a video output device capable of short-range wireless communication. Preferably an audio, earphone or video display device capable of Bluetooth communication, and the like. However, the present invention is not limited to this, and an electronic device including a wireless power receiver can receive information on various external devices that can be connected by short-range wireless communication.

The wireless power receiver transmits the external output device information received from the wireless power transmitter to the electronic device receiving the power of the wireless power receiver (S1603)

17 is a diagram for explaining a wireless charging method in a wireless charging system according to another embodiment.

Referring to FIG. 17, the wireless power transmitter 1710 and the wireless power receiver 1720 transition from the identification and configuration stage to the power transmission stage. The wireless power receiver 1720 outputs a received power packet to the wireless power transmitter 1710 to notify the power receiving state and the state of the wireless power receiver 1720 when the power transmitting step proceeds (S1701)

At this time, the wireless power receiver 1720 may request external output device information connectable to the wireless power transmitter 1710. (S1702)

Wireless power transmitter 1710 may send information about previously stored external output devices to wireless power receiver 1720. S1703 In particular, wireless power transmitter 1710 may receive information from a wireless power receiver 1720, Based on the power packet and the external output device request signal, the wireless power receiver 1720 will verify that wireless power is received in a steady state. And then transmit information about an external output device connectable with the electronic device 1730 including the wireless power receiver 1720. At this time, the information on the external output device may include a MAC address or an IP address.

Thus, the wireless power receiver 1720 outputs information about the external output device received from the wireless power transmitter 1710 to the electronic device 1730 (S1704). At this time, the electronic device 1730 receives the wireless power receiver 1530 To be easily recognized by the user.

18 is a diagram for explaining the operation of an electronic device including a wireless power receiver according to another embodiment.

Referring to Fig. 18, an electronic device including a wireless power receiver according to the present embodiment is exemplified by a cellular phone. However, the present invention is not limited to this, and may include the above-described mobile device device in which the wireless power receiving means is mounted to charge the battery.

The electronic device receives the connectable external device information from the wireless power receiver. (S1801) The external device information received at this time may include at least one information.

The electronic device can confirm the external output device information received through the wireless power receiver (S1802)

The electronic apparatus can output the external output apparatus information received through the display unit (e.g., the display unit). If there is a plurality of external output device information, the external output device information may be displayed in a list according to a predetermined order (S1803)

The electronic device can determine whether a specified external device connection request signal is received from the displayed external output device information (S1804). Specifically, the connection request signal is input through a user, Any one of the external devices can be connected.

The electronic device activates the communication unit when a connection approval request signal for connecting any one specified external device is confirmed (S1805). Specifically, the activated communication unit includes a short-range wireless communication module . ≪ / RTI >

The electronic device connects the communication with the external output device selected through the activated communication unit (S1806)

The electronic device can output data through the communication unit to a connected external output device (S1807). Specifically, when the connected external output device is an audio output device, the electronic device outputs audio output from the electronic device to the audio output device Audio data can be output. Or if the connected external output device is a video output device, the video output device may output the video output from the video output device.

19 is an exemplary diagram for explaining the connection state of the wireless charging system according to the embodiment.

19, a wireless power transmitter 1910 can seat an electronic device 1920 that includes a wireless power receiver on one side. Upon entering the power transmission phase of the wireless power reception period included in the wireless power transmitter 1910 and the electronic device 1920, information on the external output device stored in the wireless power transmitter 1910 is displayed on the electronic device screen 1925 Can be displayed.

The electronic device 1920 may display external output device information collected from the wireless power transmitter 1910.

The electronic device 1920 performs communication with any one of the specified external output devices selected according to the user's selection or the predetermined priority among the displayed external output device information. That is, the electronic device 1920 can output various data through the selected external output device 1950. In this embodiment, the selected external output device is an audio output device, and audio data output from the electronic device can be output through the audio output device.

20 is a view for explaining a wireless charging transmission coil according to the embodiment.

Referring to Fig. 20, three transmission coils can be arranged. At least one of the plurality of propagation coils may be overlapped and arranged to perform a uniform transmission in a constant-sized charging area. 20, the first coil 2010 and the second coil 2020 are disposed on the first layer side by side at a predetermined interval on the shielding member 2040, and the third coil 2030 is disposed on the first coil 2010 and the second coil 2020, Lt; RTI ID = 0.0 > 202 < / RTI >

The first coil 2010, the second coil 2020 and the third coil 203 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.

Parameter Symbol Value Outer length
(Outer lenth) dol 53.2 ± 0.5 mm Inner length
(Inner length) language 27.5 ± 0.5 mm Outside width
(Outer width) drow 45.2 ± 0.5 mm Inner width
(Inner width) diw 19.5 ± 0.5 mm Thickness dc 1.5 ± 0.5 mm Kwon
(Number of turns per layer) N 12 turns Number of floors
(Number of layer) One

The first coil 2010, the second coil 2020, and the third coil 2030 are an outer length defined in Table 1, an inner side Length, outer width, inner width, thickness, and width. Of course, the first coil 2010, the second coil 2020 and the third coil 2030 may have the same physical characteristics within an error range by the same manufacturing process.

However, each of the first coil 2010, the second coil 2020, and the third coil 2030 may have different values of inductance measured depending on the positions where the first coil 2010, the second coil 2020, and the third coil 2030 are disposed in relation to the shielding material.

For example, the first coil 2010 and the second coil 2020 satisfy the specifications of Table 1 and have an inductance of 12.5 uH, and the third coil 3630 has a distance from the shielding material to the first coil And may have an inductance that is less than 12.5 uH different from the first coil 3610 and the second coil 3620.

For example, the first coil 2010 and the second coil 2020 are disposed in contact with the shielding material, but the third coil 2030 may be disposed apart from the shielding material by a predetermined height.

In one embodiment, an adhesive may be disposed between the first coil 2010, the second coil 2020, or the third coil 3030 and the shielding material.

Therefore, in an embodiment, the third coil 2030 is connected to the first coil 2010 and the second coil 2020 a plurality of times in order to have the same inductance as the first coil 2010 and the second coil 2020 For example, 0.5 times or 1 time or 2 times).

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

In other words, the centrally located third coil 2030 is positioned farther away from the shield than the first and second coils 2010 and 2020 and the measured inductance is greater than the inductance measured by the first and second coils 2010 and 2020 So that the length of the conductor constituting the third coil 2030 is made longer than the lengths of the first coil 2010 and the second coil 2020 so that the inductance can be adjusted to be the same.

The third coil 2030 may be longer than the first coil 2010 and the second coil 2020 so that the first coil 2030 and the third coil 2030 may be made longer. The inductance of the three coils may be equal to 12.5uH although the second coil 2020 and the second coil 2020 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.

FIG. 21 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.

21, when three coils included in a wireless power transmitter have different inductances, three drive circuits 2110 connected to respective coils and three LCs including a capacitor for generating the same resonance frequency A resonance circuit 2120 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 2120 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. When the capacitance of the capacitor connected to the coil to generate the resonant frequency is 200 nF, in order to use only one capacitor, all three coils 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 2110 including an inverter for applying an AC voltage to each LC resonance circuit 2120 are also required.

22 is a view for explaining a wireless power transmitter including a plurality of coils according to an embodiment and including one drive circuit.

22, if the three coils of the wireless power transmitter have the same inductance, the wireless power receiver may include only one drive circuit 2210, and may include one drive circuit 2210 and three coils, And the switch 230 to connect the coil of the wireless power transmitter having the highest power transmission efficiency to the coil of the wireless power transmitter.

Compared with FIG. 21, the wireless power transmitter can reduce the area occupied by the components by using only one drive circuit 2210, 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 utilize the signal strength indicator in the ping stage 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 select a coil of the wireless power transmitter with a high coupling coefficient by calculating the coupling coefficient between the transmitting and receiving coils.

Alternatively, the wireless power transmitter may calculate the Q factor to determine if the queue is high in wireless < RTI ID = 0.0 > It is possible to identify the coil of the transmitter and control the switch 2230 to be connected to the drive circuit 2210.

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

23, the power transmission unit includes a drive circuit 2310 for converting an input voltage, a switch 2320 for connecting the drive circuit 2310 and the LC resonance circuit, a plurality of transmission coils 2330, a plurality of wireless power transmitters 2330, One capacitor 2340 connected in series with the coil of the switch 2320, and a controller 2350 for controlling the opening and closing of the switch 2320.

The controller 2350 identifies the coils of the wireless power receiver among the plurality of coils 2330 of the wireless power transmitter and the coils of the wireless power transmitter having the highest power transmission efficiency and outputs the coils of the identified wireless power transmitter to the drive circuit 2310. [ 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 (20)

A power transmission section including at least one transmission coil;
A power conversion unit for converting an intensity of power applied from the outside;
A storage unit for storing external device information connectable in the wireless power receiving apparatus;
A communication unit for performing communication with the wireless power receiving apparatus;
And a controller for controlling the charging mode and the charging power amount for the wireless power receiving apparatus and controlling the wireless power receiving apparatus to transmit the external apparatus information. The method according to claim 1,
The control unit
And controls transmission of the external device information to the wireless power receiving device after the start of power transmission. 3. The method of claim 2,
The control unit
And performs transmission of the external device information based on the received power packet after the received power packet is received from the wireless power receiving device. The method according to claim 1,
The control unit
And transmits the stored external device information when receiving the external device information request signal from the wireless power receiving device. 5. The method of claim 4,
Wherein the external apparatus information request signal includes power receiving status information of the wireless power receiving apparatus. The method according to claim 1,
The control unit
And controls the plurality of wireless power receiving apparatuses to transmit the external output apparatuses when there are a plurality of wireless power receiving apparatuses to which power transmission is to be performed. The method according to claim 1,
The communication unit
And transmits the external device information to the wireless power receiving device by in-band communication or out-of-band communication. Receiving coil;
A communication unit for demodulating a signal received through the reception coil to extract a packet;
And a control unit for receiving the extracted packet from the communication unit and identifying information of a connectable external device,
And the communication unit outputs the identified external device information to the electronic device. 9. The method of claim 8,
The control unit
A wireless power receiving apparatus for receiving external device information during a power transmitting step with a wireless power transmitting apparatus. 9. The method of claim 8,
The control unit
And transmits a request signal for requesting external device information to the wireless power transmission device during a power transmission step with the wireless power transmission device. 11. The method of claim 10,
The control unit
And transmits an external device information request signal to each of the plurality of wireless power transmission devices when the wireless power transmission device has a plurality of wireless power transmission devices. 9. The method of claim 8,
The control unit
And receives external device information from each of the plurality of wireless power transmission apparatuses when the wireless power transmission apparatus is a plurality of wireless power transmission apparatuses. 9. The method of claim 8,
The control unit
And outputs the external device information received from the at least one wireless power transmission device through the communication unit to the electronic device. 9. The method of claim 8,
The communication unit
Band communication or out-of-band communication to receive the external device information from the wireless power transmission device. A wireless power transmission method of a wireless power transmission apparatus,
Controlling a charging mode and a charging power for the wireless power receiving apparatus;
And transmitting the stored external device information to the wireless power receiving apparatus in the power transmitting step
Wherein the external device field is transmitted via in-band communication or out-of-band communication. 16. The method of claim 15,
The step of transmitting the external device information
And transmitting the external device information when a request signal is received from the wireless power receiving device. 16. The method of claim 15,
The step of transmitting the external device information
And transmitting the external device information based on the received received power packet after the received power packet is received from the wireless power receiving device after the power transmitting step. 16. The method of claim 15,
Wherein the plurality of wireless power receiving apparatuses sequentially transmit the external output apparatus information to the plurality of wireless power receiving apparatuses in accordance with a predetermined priority. A wireless power receiving method of a wireless power receiving apparatus,
Receiving, at the power transmitting step, external device information received from the wireless power transmitting device;
Identifying the received external device information and transmitting it to the electronic device,
Wherein the external device information is received via in-band communication or out-of-band communication. 20. The method of claim 19,
The step of receiving the external device information
And requesting and receiving external device information from the wireless power transmission device.

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