KR20180054187A - Method and apparatus for controlling a wireless power receiver including an Magnetic Secure Transmission(MST) and Wireless Power Transmission(WPT) dual antenna - Google Patents

Abstract

The present invention relates to a method and apparatus for controlling a wireless power receiver including a dual-purpose antenna for magnetic secure transmission (MST) and wireless power transmission (WPT). According to an embodiment of the present invention, the wireless power receiver comprises: a dual-purpose antenna for MST and WPT; a determination unit for determining an antenna mode based on a wireless signal received through the dual-purpose antenna; and a switching unit for selecting a transmission path of the wireless signal depending on the determined antenna mode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a wireless power receiver including an antenna combined with a Magnetic Secure Transmission (MST) and a Wireless Power Transmission (WPT) MST) and Wireless Power Transmission (WPT) dual antenna}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power receiver, and more particularly, to an apparatus and method for controlling a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) .

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 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. It is expected to be equipped with charging function.

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 use various wireless power transmission standards based on an electromagnetic induction scheme in which a magnetic field is generated in a power transmission terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a reception terminal coil due to the 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.

Meanwhile, the terminal may include a billing system according to a pin tag together with a wireless charging system. For example, the terminal may include a payment system such as Magnetic Secure Transmission (MST) or Near Field Communication (NFC). Accordingly, the terminal can mount both the antenna for the wireless charging system and the antenna for various types of payment systems.

An antenna for a wireless charging system and a plurality of antennas for various types of payment systems may each have a predetermined wireless communication standard, but there is a problem that interference may also occur between wireless communication signals having different physical characteristics.

In addition, there may be a spatial restriction to be placed in an environment in which a plurality of antennas should be installed in one terminal, and it is necessary to distinguish between the wireless charging system and each of various types of payment systems.

Therefore, there is a need for a specific method for reducing the burden of installing a plurality of antennas mounted on one terminal and distinguishing each operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) And to provide a control method and apparatus for the same.

The present invention can solve the difficulty of arranging a plurality of antennas by including one antenna for performing an operation for a wireless charging system and an operation for a billing system according to a pin tech at a time, And provides a specific method and apparatus for classifying the operation of the system.

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 receiver including a combined antenna for Magnetic Secure Transmission (MST) and Wireless Power Transmission (WPT); A determining unit determining an antenna mode based on a radio signal received through the dual antenna; A switching unit for selecting a transmission path of the radio signal according to the determined antenna mode; . ≪ / RTI >

According to an embodiment, a near field communication (NFC) antenna; As shown in FIG.

According to the embodiment, the determination unit may determine the antenna mode using the magnitude of the current or voltage generated in the dual antenna according to the radio signal.

According to the embodiment, the determination unit can determine the antenna mode using the change amount of the current or voltage generated in the dual antenna by the radio signal.

According to an embodiment, the determination unit may determine an antenna mode using a ping signal received from the dual antenna.

According to the embodiment, the determination unit may determine the antenna mode using the period or frequency of the ping signal.

According to an embodiment, the antenna mode may include a magnetic secure transmission mode and a wireless power transmission mode.

A first signal processing unit for receiving the radio signal from the determination unit when the mode is determined to be the magnetic security transmission mode; A second signal processing unit receiving the radio signal from the determination unit when the wireless power transmission mode is determined; As shown in FIG.

An MST module for receiving a first control signal generated from the first signal processing unit according to an embodiment; A wireless charging module for receiving a second control signal generated from the second signal processor; As shown in FIG.

A rectifier for converting a voltage applied from the determining unit into a predetermined voltage according to the antenna mode, As shown in FIG.

According to an embodiment, when the duplex antenna receives a radio signal including a message indicating an end of the antenna mode, the switching unit may block the selected transmission path.

Also, a method of controlling a wireless power receiver according to an exemplary embodiment of the present invention includes: receiving a wireless signal by a dual antenna for Magnetic Secure Transmission (MST) and Wireless Power Transmission (WPT); Determining an antenna mode based on the wireless signal; And selecting a transmission path of the radio signal according to the determined antenna mode; . ≪ / RTI >

According to an embodiment, the combined antenna may include a near field communication (NFC) antenna.

According to an embodiment of the present invention, the step of determining the antenna mode includes: determining an antenna mode using a magnitude of a current or a voltage generated in the dual antenna by the radio signal; . ≪ / RTI >

The determining of the antenna mode may include: determining an antenna mode using a change amount of a current or a voltage generated in the duplex antenna by the wireless signal; . ≪ / RTI >

According to an embodiment, the step of determining the antenna mode includes: determining an antenna mode using a ping signal received from the dual antenna; As shown in FIG.

According to an embodiment, the step of determining the antenna mode comprises: determining an antenna mode using a period or frequency of the ping signal; As shown in FIG.

According to an embodiment, the step of determining the antenna mode comprises the steps of: determining either a magnetic secure transmission mode or a wireless power transmission mode; . ≪ / RTI >

According to an embodiment of the present invention, in the case of determining the magnetic security transmission mode, the first signal processing unit receives the radio signal through the switching unit; And receiving, by the second signal processing unit, the radio signal through the switching unit when determining the wireless power transmission mode; As shown in FIG.

According to an embodiment, an MST module receives a first control signal generated from the first signal processor; And a wireless charging module receiving a second control signal generated from the second signal processing unit; As shown in FIG.

According to an embodiment of the present invention, the rectifying unit converts the voltage applied from the determining unit into a predetermined voltage according to the antenna mode, As shown in FIG.

According to an embodiment of the present invention, when the duplex antenna receives a radio signal including a message indicating an end of the antenna mode, the switching section blocks the selected transmission path. As shown in FIG.

According to the embodiment, the present invention can provide a computer-readable recording medium on which a program for executing the above-described method is recorded.

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

The effect of the control method and apparatus of the wireless power receiver including the magnetic security transmission (MST) and the wireless power transmission (WPT) combined antenna according to the present invention will be described as follows.

First, the present invention can mitigate the burden of disposition on one terminal by using magnetic security transmission (MST) and wireless power transmission (WPT) combined antennas in a spatial limit.

Second, the present invention uses a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna to reduce spatial interference, thereby reducing interference that may occur between antennas other than the dual antenna.

Third, the present invention can share elements that perform the same operation other than antennas by using magnetic security transmission (MST) and wireless power transmission (WPT) combined antennas.

Fourth, the present invention can reduce the number of components required through device sharing, and allow a space for a terminal due to element sharing to be miniaturized.

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 of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
3 is a state transition diagram for explaining the wireless power transmission procedure defined in the WPC standard.
4 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard;
5 is a block diagram illustrating a structure of a wireless power transmission system of an electromagnetic resonance method according to an embodiment of the present invention.
6 is an equivalent circuit diagram of a wireless power transmission system of an electromagnetic resonance method according to an embodiment of the present invention.
7 is a state transition diagram for explaining a state transition procedure in a wireless power transmitter of an electromagnetic resonance system according to an embodiment of the present invention.
8 is a state transition diagram of an electromagnetic resonance type wireless power receiver according to an embodiment of the present invention.
9 is a flowchart illustrating a wireless charging procedure of an electromagnetic resonance method according to an embodiment of the present invention.
10 is a structural diagram for illustrating a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.
11 is a flowchart illustrating a method of controlling a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.
FIG. 12 is a view for explaining an operation for distinguishing wireless communication signals received from a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.
FIG. 13 is a view for explaining an antenna arrangement according to the use of a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.

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

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

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

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

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

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

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

The wireless charging device according to the present invention 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, 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.

The terminal according to the present invention may be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, an MP3 player, (Hereinafter referred to as a " device ") capable of charging a battery by mounting a wireless power receiving means according to the present invention, but not limited thereto, can be used for a small electronic device such as a toothbrush, an electronic tag, Quot;), and the term terminal or device may be used in combination. The wireless power receiver according to another embodiment of the present invention can also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.

A wireless power receiver according to an exemplary embodiment of the present invention may include at least one wireless power transmission scheme and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission scheme may include at least one of the electromagnetic induction scheme, the electromagnetic resonance scheme, and the RF wireless power transmission scheme. In particular, the wireless power receiving means for supporting the electromagnetic induction method may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA).

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 of the present invention.

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

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission. In another example, the wireless power transmitter 10 and the wireless power receiver 20 may use out-of-band communication to exchange information using a separate frequency band that is different from the operating frequency used for wireless power transmission .

As an example, information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transceivers 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.

 In one example, the unidirectional communication may be that the wireless power receiver 20 only transmits information to the wireless power transmitter 10, but the wireless power transmitter 10 is not limited to this, Lt; / RTI >

In the half duplex communication mode, bi-directional communication is possible between the wireless power receiver 20 and the wireless power transmitter 10, but information can be transmitted only by any one device at any time.

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

In particular, the wireless power transmitter 10 according to an exemplary embodiment of the present invention may transmit a predetermined packet to the wireless power receiver 20, The wireless power receiver 20 can notify the electronic device 30 if the connected wireless power transmitter 10 is determined to support the fast charge mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.

In addition, the user of the electronic device 30 may select a predetermined fast charge request button displayed on the liquid crystal display means to control the wireless power transmitter 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 receiver 20 when the quick charge request button is selected by the user. The wireless power receiver 20 can generate a charging mode packet corresponding to the received fast charging request signal and send it to the wireless power transmitter 10 to switch the normal low power charging mode to the fast charging mode.

2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.

For example, as shown in 200a, the wireless power receiver 20 may be configured with a plurality of wireless power receiving devices, wherein a plurality of wireless power receiving devices are connected to one wireless power transmitter 10, Charging may also be performed. In this case, the wireless power transmitter 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 transmitter 10 may transmit Power can be distributed and transmitted to a plurality of wireless power receiving apparatuses using different allocated frequency bands.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus 10 is set to 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, Can be determined adaptively based on

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

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

Referring to FIG. 3, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 310, a ping phase 320, an identification and configuration phase 330, And a power transfer phase (340).

The selection step 310 may be a step of transitioning if a specific error or a specific event is detected while initiating a power transmission or maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, in a selection step 310, the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object has been placed on the interface surface, it may transition to a pinging step 320 (S301). In the selection step 310, 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 320, 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 at step 320, then the transmitter may transition back to the selection step 310 at step S302. In addition, the transmitter may transition to the selection step 310 (step S303) upon receiving the signal indicating that the power transmission is completed from the receiver, that is, the charging completion signal,

Once the ping step 320 is complete, the transmitter may transition to an identification and configuration step 330 to collect receiver identification and receiver configuration and status information (S304).

In the identifying and configuring step 330, the transmitter determines whether a packet is received or unexpected, a desired packet is received for a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract), the process can be shifted to the selection step 310 (S305).

Once the receiver has been identified and configured, the transmitter may transition to power transfer step 340, which transmits the wireless power (S306).

In a power transfer step 340, the transmitter may send an unexpected packet, a desired packet may not be received during a predefined period of time (time out), a violation of a predetermined power transmission contract may occur transfer contract violation, and if the charging is completed, the process can be shifted to the selection step 310 (S307).

Also, in power transfer step 340, if the transmitter needs to reconfigure a power transfer contract based on transmitter state changes, etc., it may transition to identification and configuration step 330 (S308).

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.

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

Referring to FIG. 4, power transmission from a transmitter to a receiver according to the PMA standard is largely divided into a standby phase 410, a digital ping phase 420, an identification phase 430, A Power Transfer Phase 440, and an End of Charge Phase 450.

The waiting step 410 may be a step of performing a receiver identification procedure for power transmission or a transition if a specific error or a specific event is detected while maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at a standby step 410, the transmitter may monitor whether an object is present on the Charging Surface. If the transmitter detects that an object is placed on the charging surface, or if an RXID retry is in progress, the digital ping step 420 may proceed (S401). Here, RXID is a unique identifier assigned to a PMA compatible receiver. In a standby step 410, 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 ping stage 420 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 420, the receiver may transition to the identifying step 430 if a valid response signal is received (S402).

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 420, the transmitter may transition to the wait step 410 (S403). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 430, the transmitter may transition to the waiting step 410 if the receiver identification procedure fails or the receiver identification procedure must be re-performed and the receiver identification procedure is not completed for a predefined period of time S404).

If the transmitter succeeds in identifying the receiver, the transmitter may transition from the identifying step 430 to the power transfer step 440 and start charging (S405).

In a power transfer step 440, 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, (S406).

Also, in the power transmission step 440, if the temperature sensed by the temperature sensor provided inside the transmitter exceeds a predetermined reference value, the transmitter may transition to the charging completion step 450 (S407).

In the charge completion step 450, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter may transition to the standby state 410 (S409).

Also, if the measured temperature drops below the reference value in the over temperature state, the transmitter may transition from the charging completion step 450 to the digital charging step 420 in step S410.

In the digital ping stage 420 or the power transmission stage 440, the transmitter may transition to the charge completion stage 450 when an end of charge (EOC) request is received from the receiver (S408 and S411).

5 is a block diagram illustrating a structure of a wireless power transmission system of an electromagnetic resonance method according to an embodiment of the present invention.

Referring to FIG. 5, the wireless power transmission system may include a wireless power transmitter 510 and a wireless power receiver 520. FIG.

Although FIG. 5 illustrates a wireless power transmitter 510 transmitting wireless power to one wireless power receiver 520, this is only one embodiment, and the wireless power according to another embodiment of the present invention Transmitter 510 may also transmit wireless power to a plurality of wireless power receivers 520. It should be noted that the wireless power receiver 520 according to yet another embodiment may receive wireless power from multiple wireless power transmitters 510 at the same time.

The wireless power transmitter 510 may generate a magnetic field using a particular power transmission frequency to transmit power to the wireless power receiver 520. [

The wireless power receiver 520 may receive power by tuning to the same frequency as that used by the wireless power transmitter 510. [

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

That is, the power transmitted by the wireless power transmitter 510 may be communicated to a wireless power receiver 520 that is in resonance with the wireless power transmitter 510.

The maximum number of wireless power receivers 520 capable of receiving power from one wireless power transmitter 510 is determined by the maximum transmission power level of the wireless power transmitter 510, the maximum power reception level of the wireless power receiver 520, May be determined based on the physical structure of the power transmitter 510 and the wireless power receiver 520. [

The wireless power transmitter 510 and the wireless power receiver 520 can perform bidirectional communication in a frequency band different from the frequency band for the wireless power transmission, i.e., the resonance frequency band. For example, bi-directional communication may be a half-duplex Bluetooth low energy (BLE) communication protocol.

The wireless power transmitter 510 and the wireless power receiver 520 may exchange their characteristics and status information, i.e., power negotiation information, via the bidirectional communication.

In one example, the wireless power receiver 520 may transmit certain power reception state information for controlling the power level received from the wireless power transmitter 510 to the wireless power transmitter 510 via bi-directional communication, 510 may dynamically control the transmit power level based on the received power reception state information. Accordingly, the wireless power transmitter 510 not only can optimize the power transmission efficiency, but also has a function of preventing a load breakage due to an over-voltage, a function of preventing unnecessary power from being wasted due to an under-voltage And the like can be provided.

In addition, the wireless power transmitter 510 performs functions such as authenticating and identifying wireless power receiver 520 via bi-directional communication, identifying incompatible devices or non-rechargeable objects, identifying a valid load, and the like You may.

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

The wireless power transmitter 510 includes a power supplier 511, a power conversion unit 512, a matching circuit 513, a transmission resonator 514, a main controller , 515, and a communication unit (communication unit) 516. The communication unit may include a data transmitter and a data receiver.

The power supply unit 511 may supply a specific supply voltage to the power conversion unit 512 under the control of the main control unit 515. [ At this time, the supply voltage may be a DC voltage or an AC voltage.

The power conversion unit 521 can convert the voltage received from the power supply unit 511 into a specific voltage under the control of the main control unit 515. [ To this end, the power conversion unit 521 may include at least one of a DC / DC converter, an AC / DC converter, and a power amplifier.

The matching circuit 513 is a circuit for matching impedances between the power conversion section 521 and the transmission resonator 514 in order to maximize the power transmission efficiency.

The transmission resonator 514 can transmit power wirelessly using a specific resonance frequency according to the voltage applied from the matching circuit 513. [

The wireless power receiver 520 includes a reception resonator 521, a rectifier 522, a DC-DC converter 523, a load 524, a main controller 525 And a communication unit (communication unit) 526. The communication unit may include a data transmitter and a data receiver.

The reception resonator 521 can receive the power transmitted by the transmission resonator 514 through the resonance phenomenon.

The rectifier 521 can perform a function of converting an AC voltage applied from the reception resonator 521 to a DC voltage.

The DC-to-DC converter 523 can convert the rectified DC voltage to a specific DC voltage required by the load 524.

The load 524 may be the internal battery of the terminal including the wireless power receiver. The internal battery can store power in the battery using the specific DC voltage output from the DC-DC converter 523 as an input voltage.

The main control unit 525 controls the operation of the rectifier 522 and the DC-DC converter 523 or generates the characteristic and status information of the wireless power receiver 520 and controls the communication unit 526 to control the wireless power transmitter 510, And transmit the characteristics and status information of the wireless power receiver 520 to the wireless network. For example, the main control section 525 can control the operation of the rectifier 522 and the DC-DC converter 523 by monitoring the intensity of the output voltage and current at the rectifier 522 and the DC-DC converter 523 have.

The monitored output voltage and current intensity information may be transmitted to the wireless power transmitter 510 through the communication unit 526 in real time.

The main control unit 525 compares the rectified DC voltage with a predetermined reference voltage to determine whether it is an over-voltage state or an under-voltage state, and when a system error state is detected It may transmit the detection result to the wireless power transmitter 510 through the communication unit 526. [

When the system error state is detected, the main control unit 525 controls the operation of the rectifier 522 and the DC-DC converter 523 to prevent the load from being damaged, or controls the operation of the rectifier 522 and the DC-DC converter 523, A blocking circuit may be used to control the power applied to the load 524.

5, the main control units 515 and 525 and the communication units 516 and 526 are shown as being composed of different modules, but this is merely one embodiment, and another embodiment of the present invention is characterized in that the main control unit 515, and 525 and the communication units 516 and 526 may be configured as a single module.

6 is an equivalent circuit diagram of a wireless power transmission system of an electromagnetic resonance method according to an embodiment of the present invention.

In detail, FIG. 6 shows the interface points on the equivalent circuit in which reference parameters to be described later are measured.

Hereinafter, the meaning of the reference parameters shown in FIG. 6 will be briefly described.

I _TX and I _{TX _COIL} denote the RMS (Root Mean Square) current applied to the matching circuit (or matching network) 601 of the wireless power transmitter and the RMS current applied to the transmitting resonator coil 602 of the wireless power transmitter, respectively do.

And Z and Z _{TX TX _IN _IN_COIL} means the input impedance at each input impedance of the matching circuit 601, the front end of the wireless power transmitter (Input Impedance) and the matching circuit 601 and the rear end transmission resonator coil 602 shear.

L1 and L2 denote the inductance value of the transmitting resonator coil 602 and the inductance value of the receiving resonator coil 603, respectively.

Z _{RX _IN} means the input impedance of the matching circuit 604 and the rear end filter / rectifier / load 605, the front end of the wireless power receiver.

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

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

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

When the matching circuit 604 of the wireless power receiver is connected to the rectifier, the real part of the Z _{TX - - IN} may be inversely related to the load resistance of the rectifier - hereinafter referred to as R _RECT . That is, an increase in R _RECT may decrease Z _{TX_IN,} and a decrease in R _RECT may increase Z _{TX_IN} .

The resonator coupling efficiency according to the present invention may be a maximum power reception ratio calculated by dividing the power delivered from the receiving resonator coil to the load 604 by the power supplied to the resonant frequency band in the transmitting resonator coil 602 have. Resonator matching efficiency between the wireless power transmitter and wireless power receiver can be calculated if the reference port impedance (Z _{TX_IN)} and receiving a reference port impedance (Z _{_IN RX)} of the cavity resonator is a transmission that is perfectly matched.

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

7, the state of the wireless power transmitter is divided into a configuration state 710, a power save state 720, a low power state 730, a power transfer state 730, , 740, a Local Fault State 750, and a Latching Fault State 760.

When power is applied to the wireless power transmitter, the wireless power transmitter can transition to the configuration state 710. [ The wireless power transmitter may transition to a power saving state 720 when a predetermined reset timer expires in the configuration state 710 or the initialization procedure is completed.

In the power saving state 720, the wireless power transmitter may generate a beacon sequence and transmit it via the resonant frequency band.

Here, the wireless power transmitter may control the beacon sequence to start within a predetermined time after entering the power saving state 720. [ For example, the wireless power transmitter may control, but is not limited to, initiating the beacon sequence within 50 ms of the power saving state 720 transition.

In the power saving state 720, the wireless power transmitter periodically generates and transmits a first beacon sequence for sensing the wireless power receiver, and detects a change in impedance of the reception resonator, that is, a load variation . Hereinafter, for convenience of explanation, the first beacon and the first beacon sequence will be referred to as Short Beacon and Short Beacon sequences, respectively.

In particular, Short Beacon sequences are generated repeatedly with a short period (t _{SHORT _BEACON)} a predetermined time interval (t _CYCLE) to be a standby power of the wireless transmitter power saving until the wireless power receiver detection may be transmitted. For example, t _{SHORT _BEACON} is less than 30ms, t _CYCLE can be respectively set to 250ms ± 5 ms. Also, the current intensity of the short beacon is not less than a predetermined reference value, and can be gradually increased for a predetermined time period. In one example, the minimum current intensity of the Short Beacon may be set high enough such that the category 2 or higher wireless power receiver of Table 2 can be detected.

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

Also, in the power saving state 720, the wireless power transmitter may periodically generate and transmit a second beacon sequence for providing sufficient power for the booting and response of the wireless power receiver. Hereinafter, for convenience of explanation, the second beacon and the second beacon sequence will be referred to as Long Beacon and Long Beacon sequences, respectively.

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

In particular, Long Beacon sequences are generated at a predetermined time interval (t _{LONG _BEACON_PERIOD)} while for a relatively long period (t _{LONG_BEACON)} than the Short Beacon be sent in order to provide sufficient power required by the boot of the wireless power receiver. For example, t _{LONG _BEACON} can be set to 105 ms + 5 ms, and t _{LONG _BEACON_PERIOD} can be set to ₈₅₀ ms, respectively. The current intensity of the long beacon can be relatively strong compared to the current intensity of the short beacon. In addition, the long beacon can maintain the power of a constant intensity during the transmission interval.

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

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

The wireless power transmitter may establish an out-of-band communication link with the wireless power receiver after transitioning from a power saving state 720 to a low power state 730 upon receipt of an advertisement signal. Subsequently, the wireless power transmitter may perform the registration procedure for the wireless power receiver over the established out-of-band communication link. For example, if out-of-band communication is a Bluetooth low-power communication, the wireless power transmitter may perform Bluetooth pairing with the wireless power receiver and exchange at least one of the status information, characteristic information, and control information of each other via the paired Bluetooth link have.

If the wireless power transmitter transmits to the wireless power receiver a predetermined control signal for initiating charging via out-of-band communication in a low power state 730, i.e., a predetermined control signal requesting the wireless power receiver to transmit power to the load , The state of the wireless power transmitter may transition from the low power state 730 to the power transfer state 740. [

If the out-of-band communication link establishment procedure or registration procedure in the low power state 730 is not normally completed, the state of the wireless power transmitter may transition from the low power state 730 to the power saving state 720. [

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

If all of the link expiration timers corresponding to the out-of-band communication link established between the wireless power transmitter and the at least one wireless power receiver have expired in the low power state 730 or the power transfer state 740, May be transitioned to power saving state 720. < RTI ID = 0.0 >

In addition, the wireless power transmitter in low power state 730 can drive a predetermined registration timer when a valid ad signal is received from the wireless power receiver. At this time, if the registration timer expires, the wireless power transmitter in the low power state 730 may transition to the power saving state 720. [ At this time, the wireless power transmitter may output a predetermined notification signal notifying the registration failure through a notification display means provided in the wireless power transmitter, for example, an LED lamp, a display screen, a beeper, have.

Further, in the power transfer state 740, the wireless power transmitter may transition to a low power state 730 upon completion of charging all connected wireless power receivers.

In particular, the wireless power receiver may allow registration of a new wireless power receiver in states other than configuration state 710, local failure state 750, and lock failure state 760. [

In addition, the wireless power transmitter can dynamically control the transmit power based on state information received from the wireless power receiver in the power transmit state 740. [

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

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

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

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

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

The power transmission state 740 may be in any one of a first state 741, a second state 742 and a third state 743 depending on the power reception state of the connected wireless power receiver.

In one example, the first state 741 may indicate that the power reception state of all the wireless power receivers connected to the wireless power transmitter is in a normal voltage state.

The second state 742 may mean that there is no wireless power receiver in which the power reception state of at least one wireless power receiver connected to the wireless power transmitter is in a low voltage state and in a high voltage state.

The third state 743 may indicate that the power reception state of at least one wireless power receiver connected to the wireless power transmitter is in a high voltage state.

The wireless power transmitter may transition to a lock failure state 760 if a system error is detected in a power saving state 720 or a low power state 730 or a power transmission state 740. [

The wireless power transmitter in the lock fault condition 760 may transition to either a configuration state 710 or a power saving state 720 if all connected wireless power receivers are determined to have been removed from the charging area.

In addition, in the lock fault condition 760, the wireless power transmitter may transition to the local fault condition 750 if a local fault is detected. Here, the wireless power transmitter, which is the local failure state 750, may transition back to the lock failure state 760 once the local failure is released.

On the other hand, when transitioning from a state of either the configuration state 710, the power saving state 720, the low power state 730, or the power transfer state 740 to the local failure state 750, If it is released, it may transition to the configuration state 710.

The wireless power transmitter may shut off the power supplied to the wireless power transmitter if the wireless power transmitter transitions to the local failure state 750. [ For example, the wireless power transmitter may transition to a local fault condition 750 when a fault such as overvoltage, overcurrent, or overtemperature is detected, but is not limited thereto.

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

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

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

The wireless power transmitter may transition to the lock fault condition 760 if the intensity of the output current of the transmit resonator is above a reference value. At this time, the wireless power transmitter that has transitioned to the lock failure state 760 may attempt to make the intensity of the output current of the transmission resonator less than a reference value for a predetermined time. Here, the attempt may be repeated for a predetermined number of times. If the lock failure state 760 is not released despite repeated execution, the wireless power transmitter transmits a predetermined notification signal indicating that the lock failure state 760 is not released to the user using a predetermined notification means can do. At this time, if all of the wireless power receivers located in the charging area of the wireless power transmitter are removed from the charging area by the user, the locking failure state 760 may be released.

On the other hand, if the intensity of the output current of the transmission resonator falls below the reference value within a predetermined time, or if the intensity of the output current of the transmission resonator falls below the reference value during the predetermined repetition, the lock failure state 760 is automatically released At which time the state of the wireless power transmitter may automatically transition from a lockout state 760 to a power saving state 720 to perform the detection and identification procedure again for the wireless power receiver.

The wireless power transmitter in the power transmission state 740 can transmit continuous power and adaptively control the transmit power based on the state information of the wireless power receiver and the predefined optimal voltage region setting parameters have.

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

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

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

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

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

8 is a state transition diagram of an electromagnetic resonance type wireless power receiver according to an embodiment of the present invention.

8, the state of the wireless power receiver is largely divided into a disable state 810, a boot state 820, an enable state 830 (or an On state), and a system error state System Error State, 840).

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

The activation state 830 may be divided into an optimum voltage state 831, a low voltage state 832 and a high voltage state 833 according to the value of V _RECT .

The wireless power receiver in the deactivation state 810 may transition to the boot state 820 if the measured V _RECT value is greater than or equal to the predefined V _{RECT_BOOT} value.

In the boot state 820, the wireless power receiver establishes an out-of-band communication link with the wireless power transmitter and transmits a V _RECT And wait until the value reaches the required power at the lower end.

The wireless power receiver in the boot state 820 receives the V _RECT If it is ascertained that the value reaches the required power at the lower stage, it can transition to the activated state 830 and start charging.

The wireless power receiver in the active state 830 may transition to the boot state 820 if it is confirmed that the charging is complete or the charging is interrupted.

In addition, the wireless power receiver in the active state 830 may transition to a system fault state 840 if a predetermined system fault is detected. Here, system faults may include overvoltage, overcurrent, and overheating, as well as other predefined system fault conditions.

In addition, the wireless power receiver in the active state 830 may receive V _RECT If the value falls below the V _{RECT _BOOT} value, it may transition to the inactive state 810.

In addition, the wireless power receiver in the boot state 820 or system error state 840 may transition to the inactive state 810 if the V _RECT value falls below the V _{RECT_BOOT} value.

9 is a flowchart illustrating a wireless charging procedure of an electromagnetic resonance method according to an embodiment of the present invention.

Referring to FIG. 9, the wireless power transmitter may generate a beacon sequence and transmit the beacon sequence through a transmission resonator when booting is completed (S901).

When the beacon sequence is detected, the wireless power receiver can broadcast an advertisement signal including its identification information and characteristic information (S903). It should be noted that the advertisement signal may be repeatedly transmitted at predetermined intervals until a connection request signal, which will be described later, is received from the wireless power transmitter.

When the wireless power transmitter receives the advertisement signal, it may transmit a predetermined connection request signal to the wireless power receiver to set an out-of-band communication link (S905).

Upon receipt of the connection request signal, the wireless power receiver may establish an out-of-band communication link and transmit its static status information over the established out-of-band communication link (S907).

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

The wireless power transmitter may transmit the static state information of the wireless power transmitter to the wireless power receiver via the out-of-band communication link when the static state information of the wireless power receiver is received (S909).

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

Thereafter, the wireless power receiver monitors its own real-time power receiving state and charging state, and may transmit dynamic state information to the wireless power transmitter at periodic or specific event occurrence (S911).

Here, the dynamic state information of the wireless power receiver includes information on the rectifier output voltage and current, information on the voltage and current applied to the load, information on the internal measured temperature of the wireless power receiver, reference parameter change information A rectified voltage minimum value, a rectified voltage maximum value, and an initially set preferred rectifier terminal voltage change value), charging state information, system error information, and alarm information. The wireless power transmitter may perform power adjustment by changing a set value included in the existing static state information when receiving the reference parameter change information for the power control.

In addition, the wireless power transmitter may send a predetermined control command over the out-of-band communication link to control the wireless power receiver to initiate charging when sufficient power is available to charge the wireless power receiver (S913).

The wireless power transmitter may then receive dynamic state information from the wireless power receiver and dynamically control the transmit power (S915).

The wireless power receiver may also transmit to the wireless power transmitter data to identify the system error in the dynamic state information and / or data indicating that charging is complete if an internal system error is detected or the charging is completed S917). Here, the system error may include overcurrent, overvoltage, overheating, and the like.

For example, the out-of-band communication method applicable to the present invention includes NFC (Near Field Communication) communication, RFID (Radio Frequency Identification) communication, BLE (Bluetooth Low Energy) communication, WCDMA (Wideband Code Division Multiple Access) Term Evolution / LTE-Advance communication, and Wi-Fi communication.

10 is a structural diagram for illustrating a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.

11, the wireless power receiver 1000 includes an antenna 1010 for Magnetic Strength Transmission (MST) and a wireless power transmission (WPT), a determination unit 1020, a switching unit 1030, a first signal processing unit 1040 ), An MST module 1050, a second signal processing unit 1060, and a wireless charging module 1070. 10 are not essential, a wireless power receiver having more or fewer components may be implemented.

A magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna 1010 (hereinafter "combined antenna") can transmit and receive wireless signals. The radio signal may be a magnetic field signal generated by the dual antenna 1010.

The combined antenna 1010 may transmit and receive a magnetic field signal according to the circumstances, but the magnetic field signal may include only one of the MST settlement information and the wireless power signal.

The wireless power receiver 1000 may operate in a magnetic security transmission (MST) mode when receiving a magnetic field signal including MST settlement information, and may be operable in a wireless power transmission mode when receiving a magnetic field signal including a wireless power signal Can operate.

The MST payment information may include credit card information by the MST module 1050 included in the wireless power receiver 1000 or information on the payment means corresponding to the credit card. The wireless power signal may include a control signal and a power signal for wireless power transmission between the wireless power transceivers in FIGS. 1-9.

The combined antenna 1010 can transmit and receive a magnetic field signal to and from an MST reader (not shown). The MST reader may be included in the payment terminal. The payment terminal may include, for example, a POS (or CAT) system and may manage sales information through a POS system. The payment terminal can generally be operated by a cashier.

The payment terminal receives the magnetic field signal generated from the dual antenna 1010, decodes the magnetic field signal, and converts the decoded magnetic field signal into a digital signal and transmits the digital signal to the CPU of the payment terminal.

Of course, the combined antenna 1010 may also receive a wireless power signal from a wireless power transmitter.

In the present invention, the combined antenna 1010 is not limited to the wireless power transmission scheme. In other words, the dual antenna 1010 can receive power by at least one of an electromagnetic induction method, an electromagnetic resonance method, an RF wireless power transmission method, or other wireless power transmission method.

Also, in the present invention, the combined antenna 1010 is not limited to various wireless power transmission standards that are subject to the same wireless power transmission scheme. In other words, the wireless power antenna that receives power according to the electromagnetic induction scheme can receive power by the standard of at least one of Wireless Power Consortium (WPC) or Power Matrix Alliance (PMA). In addition, a wireless power antenna receiving power in accordance with an electromagnetic resonance method can receive power in a resonance manner defined by the A4WP (Alliance for Wireless Power) standard mechanism.

The combined antenna 1010 may include an inductor and the inductor may include a loop having at least one winding. The inductor of the combined antenna 1010 may be wound in a clockwise or counterclockwise direction and may be constituted by a coil of a polygonal shape such as a circular, elliptical or quadrangular shape.

On the other hand, there may be a range in which the range of the inductance inductance required by the MST module 1050 and the range of the inductive capacity of the inductor required by the wireless charging module 1070 overlap.

The combined antenna 1010 of the present invention may have an inductance value within a range in which the inductive capacity range of the inductors required by the MST module 1050 and the wireless charging module 1070 overlap. For example, the range of inductive capacitance required by both the MST module 1050 and the wireless charging module 1070 may be between 10 and 13 uH.

In other words, the combined antenna 1010 of the present invention may have an inductance value within a range where the range of the inductive capacitance required by the MST module 1050 and the wireless charging module 1070 is matched.

The determination unit 1020 can identify which of the MST settlement information and the wireless power signal the magnetic field signal received from the dual antenna 1010 is.

Although the inductance values required by the MST module 1050 and the wireless charging module 1070 are the same, the frequency characteristics of the magnetic field signals required by the MST module 1050 and the wireless charging module 1070 may be different.

In other words, the frequency characteristics of the magnetic field signal for operating in the Magnetic Stability Transfer (MST) mode and the wireless power transfer mode may be different.

The determination unit 1020 may calculate frequency characteristics of the received magnetic field signal and compare the frequency characteristics of the magnetic field signals corresponding to the MST module 1050 and the wireless charging module 1070, respectively.

The determination unit 1020 may compare the frequency characteristic information of the magnetic field signal corresponding to each of the MST module 1050 and the wireless charging module 1070 with the frequency characteristic information stored in advance in the determination unit 1020 or in the external memory. The frequency characteristic information may include a used frequency band, a bandwidth, a magnitude of a frequency, a phase of a frequency, and the like.

The determination unit 1020 may determine which of the MST module 1050 and the wireless charging module 1070 transmits the received magnetic field signal through the comparison process.

The magnetic field signal received by the determiner 1020 may be a ping signal or a beacon signal of a wireless power signal applicable to the WPC standard. The determination unit 1020 may determine that the received magnetic field signal is a signal necessary for the operation of the wireless charging module 1070 when the received magnetic field signal matches the frequency characteristics of the ping signal or the beacon signal.

The switching unit 1030 switches the received magnetic field signal to the first signal processing unit 1040 or the second wireless signal processing unit 1070 interlocked with the MST module 1050 according to the determination of the determination unit 1020, (1060).

Each of the first signal processing unit 1040 and the second signal processing unit 1060 can perform a reconversion of a magnetic field signal according to a predefined data frame so as to be processed by the MST module 1050 and the wireless charging module 1070 have.

For example, the second signal processing unit 1060 interlocked with the wireless charging module 1070 can perform signal processing by ASK / FSK.

The MST module 1050 can control and manage the MST operation (hereinafter referred to as "MST mode") for performing the non-contact settlement. The MST module 1050 may control the process of generating a magnetic field corresponding to information on a payment means that is similar to a credit card or a credit card.

The wireless charging module 1070 can generally manage an operation for transmitting and receiving a wireless power signal (hereinafter referred to as a "wireless power transmission mode").

The rectifying unit (not shown) can convert the current or voltage applied from the determining unit into a predetermined voltage according to the determined antenna mode.

The present invention can reduce the material cost by sharing the elements such as the rectifying part together with the use of the combined antenna 1010, and it is possible to miniaturize the wireless power receiver by avoiding the use of overlapping elements.

11 is a flowchart illustrating a method of controlling a wireless power receiver including a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.

11, a combined antenna for a magnetic security transmission (MST) and a wireless power transmission (WPT) (hereinafter referred to as a "combined antenna") can receive a wireless signal (S1110).

The radio signal received from the dual antenna may be a magnetic field signal generated by the dual antenna. The magnetic field signal received by the dual antenna may include either the MST settlement information or the wireless power signal.

In addition, the wireless power receiver may include a near field communication (NFC antenna) together with a dual antenna. The wireless power receiver may include an MST mode for performing MST settlement, a wireless power transmission mode for receiving power wirelessly, And NFC mode in which NFC is performed.

The wireless power receiver may determine an antenna mode (wireless power transmission mode or magnetic security forwarding mode) based on the wireless signal (S1120).

The wireless signal may include either the MST payment information or the wireless power signal, but one wireless signal can not simultaneously include the MST payment information and the wireless power signal.

Thus, the wireless power receiver can determine the antenna mode based on the wireless signal received by the dual antenna.

An antenna mode included in a wireless power receiver may include an MST mode, a wireless power transmission mode, and an NFC mode. However, the wireless power receiver can not operate in more than one of the MST mode, the wireless power transmission mode, and the NFC mode at the same time, and can operate only in either one of them.

The MST mode is a mode for transmitting / receiving settlement information to / from an MST reader via an MST antenna. The wireless power transmission mode is a mode for receiving power using a power signal received from a wireless power transmitter. The NFC mode is a mode for performing NFC communication to be.

When a wireless power receiver receives a wireless signal from a dual antenna, it can determine what mode it should operate.

The wireless power receiver can determine the antenna mode using the magnitude of the voltage or current generated in the dual antenna by the wireless signal.

The wireless power receiver may determine the MST mode if the magnitude of the voltage or current generated in the dual antenna is included in a preset first threshold range and the wireless power receiver determines that the magnitude of the voltage or current generated in the dual antenna is less than the second threshold The wireless power transmission mode can be determined.

The first threshold range may be set by experiments related to the magnitude of the voltage or current that may be generated in a separate MST antenna, or may be set by standard specifications. The second threshold range may be set by experiments related to the magnitude of the voltage or current that may be generated in a separate wireless power transmission antenna, or may be set by standard specifications.

Alternatively, the wireless power receiver can determine the antenna mode using a change amount of a voltage or a current generated in the dual antenna in a manner similar to the above.

Meanwhile, the wireless power receiver can determine the antenna mode using the period or frequency of the wireless signal.

The wireless signal including the wireless power signal and the wireless signal including the MST payment information may be transmitted and received according to the standard according to each standard or communication protocol.

Thus, the wireless power receiver may operate in the MST mode if it corresponds to the MST standard, and in the wireless power transmission mode if it corresponds to the wireless power transmission standard, by analyzing the period or frequency of the wireless signal.

In one embodiment, the received radio signal to determine the antenna mode may be a ping signal. In other words, the wireless power receiver can operate in the wireless power transmission mode when the analyzed zine signal by analyzing the frequency or frequency of the ping signal from the dual antenna corresponds to the WPC standard.

The wireless power receiver may select the transmission path of the wireless signal according to the determined antenna mode (S1130).

Although the wireless power receiver uses a dual antenna, the wireless power receiver may separately include a respective MST module and a wireless power transfer module (wireless charging module) that generally control the MST mode and the wireless power transfer mode.

Accordingly, in the case of the MST mode, the wireless power receiver can select a path for transmitting the wireless signal to the MST module, and can select a path for transmitting the wireless signal to the wireless charging module in the wireless power transmission mode.

The wireless power receiver may perform a wireless power transmission mode or a magnetic security transmission mode, respectively (S1140).

The wireless power receiver can transmit and receive MST payment information to and from the MST reader according to the MST mode, and can charge the internal or external battery according to the wireless charging mode.

Prior to this, the dual antenna can receive radio signals according to different modulation and demodulation schemes according to the MST mode and the wireless power transmission mode. Thus, in the performance of the MST mode and the wireless power transmission mode, the wireless power receiver can perform different signal processing processes for each signal.

The first signal processing unit linked with the MST module can generate the first control signal by performing signal processing according to the MST standard, and the second signal processing unit linked with the wireless charging module performs signal processing according to the wireless power transmission standard Thereby generating a second control signal.

FIG. 12 is a view for explaining an operation for distinguishing wireless communication signals received from a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.

12, a wireless power receiver calculates a magnetic field signal received by a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna (hereinafter referred to as a "combined antenna" So that the antenna mode can be determined.

Depending on the situation, the magnetic field signal may be transmitted and received, but the magnetic field signal may include only one of the MST settlement information and the wireless power signal.

12A is a frequency graph of a first magnetic field signal including MST settlement information. The x-axis can have time as a variable, and the y-axis can have the magnitude or phase of the magnetic field signal as a variable.

The first magnetic field signal may be generated from a dual antenna, for example, the first magnetic field signal may have a bandwidth corresponding to a pulse timing of 10 to 60 占 퐏 in relation to the interval 1211 between signals.

In addition, the length 1212 of the first magnetic field signal itself may have a predetermined number of bytes including various information according to the data frame structure, and the size 1213 of the first magnetic field signal may have a predetermined size Lt; / RTI >

12 (b) is a frequency graph of a second magnetic field signal including a wireless power signal. The x-axis can have time as a variable, and the y-axis can have the magnitude or phase of the magnetic field signal as a variable.

The second magnetic field signal may receive a ping signal or a beacon signal according to various kinds of wireless power transmission schemes.

For example, in the electromagnetic induction method, the second magnetic field signal may be a ding signal, and the interval 1221 between the ding signals, the length 1222 of the signal, and the size 1223 of the signal may be preset. Although the same electromagnetic induction scheme is followed, the characteristics of the signal can be set differently according to different standards (e.g., WPC and PMA). The operating frequency range of the electromagnetic induction system is the LF band, which can vary from several hundreds of KHz depending on the standard. The electromagnetic induction system according to the WPC standard can use the frequency band of 110 to 205 KHz, and the electromagnetic induction system according to the PMA standard can use the frequency band of 232 to 278 KHz or 205 to 300 KHz.

As another example, the second magnetic field signal by the electromagnetic resonance method may be a beacon signal, and the interval 1221 between the beacon signals, the length 1222 of the signal, and the size 1223 of the signal may be preset. The operating frequency of the electromagnetic resonance method may be 6.78 MHz or 13.56 MHz in the HF band.

The wireless power receiver can calculate the characteristics of the magnetic field signal received from the dual antenna and determine the antenna mode by comparing the characteristics of the calculated signal with the characteristics of the first magnetic field signal or the characteristics of the second magnetic field signal.

The wireless power receiver may determine the antenna mode using the magnitude of the voltage or current generated from the dual antenna.

The wireless power receiver can determine that the first magnetic field signal includes the MST settlement information when the magnitude of the voltage or current generated in the dual antenna is included in the first threshold range due to the magnetic field signal received by the dual antenna.

The wireless power receiver may determine that the second magnetic field signal includes the wireless power signal when the magnitude of the voltage or current generated in the dual antenna is included in the second threshold range due to the magnetic field signal received by the dual antenna.

FIG. 13 is a view for explaining an antenna arrangement according to the use of a magnetic security transmission (MST) and a wireless power transmission (WPT) combined antenna according to an embodiment of the present invention.

13 (a), a first wireless power receiver 1310 may include both a wireless power antenna 1311, an MST antenna 1312, and an NFC antenna 1313. [ The wireless power receiver can perform three modes.

In one embodiment, the NFC antenna 1313 has a higher frequency band than the wireless power antenna 1311, so that the NFC antenna 1313 can be arranged in a conductive pattern in a rectangular shape along the outer periphery of the wireless power antenna 1311. The wireless power antenna 1311 performs power transmission and uses a lower frequency band than the NFC antenna 1313, so that the NFC antenna 1313 can be placed. The MST antenna may be disposed between the NFC antenna 1313 and the wireless power antenna 1311.

Referring to FIG. 13B, a second wireless power receiver 1320 according to an embodiment of the present invention includes an antenna 1321 (hereinafter referred to as a " combined antenna ") for both Magnetic Security Transmission (MST) And an NFC antenna 1323. The NFC-

The second wireless power receiver 1320 may include a dual-purpose antenna 1321 to reduce the placement space of the antenna relative to the first wireless power receiver 1310. [ The feature that the arrangement space of the antennas is reduced is that the arrangement distance between the duplex antenna 1321 and the NFC antenna 1323 is increased and the interference between the antennas is reduced as the arrangement distance is increased. The feature of reducing interference in the present invention is that the interference of signals in the magnetic field region can affect each other in a multi-frequency (multiples) frequency band, and the problem of deterioration that can be caused thereby can be solved.

In addition, the three antennas included in the first wireless power receiver 1310 require antenna terminals for transmitting signals generated from the respective antennas. In contrast, the second wireless power receiver 1320 can reduce the space occupied by the antenna terminals by sharing the required antenna terminals (MST antenna terminal and wireless power terminal). Reduced space can help miniaturize the wireless power receiver and allow other circuitry to use the space.

The second wireless power receiver 1320 in addition to the antenna terminal can increase the number of elements that can be shared by using the common antenna 1321. [ For example, a rectifier or a converter that can be directly connected to the dual antenna 1321 can be shared in an MST mode or a wireless power transmission mode.

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 (23)

A dual antenna for Magnetic Secure Transmission (MST) and Wireless Power Transmission (WPT);
A determining unit determining an antenna mode based on a radio signal received through the dual antenna; And
A switching unit for selecting a transmission path of the radio signal according to the determined antenna mode;
/ RTI >
Wireless power receiver. The method according to claim 1,
A near field communication (NFC) antenna;
≪ / RTI >
Wireless power receiver. The method according to claim 1,
Wherein,
And determining an antenna mode by using a magnitude of a current or a voltage generated in the dual antenna by the radio signal,
Wireless power receiver. The method according to claim 1,
Wherein,
And an antenna mode is determined by using a change amount of a current or a voltage generated in the dual antenna by the radio signal,
Wireless power receiver. The method according to claim 1,
Wherein,
And determining an antenna mode using a ping signal received from the dual antenna,
Wireless power receiver. 6. The method of claim 5,
Wherein,
Determining an antenna mode using a period or a frequency of the ping signal,
Wireless power receiver. The method according to claim 1,
Wherein the antenna mode includes a magnetic secure transmission mode and a wireless power transmission mode.
Wireless power receiver. 8. The method of claim 7,
A first signal processing unit for receiving the radio signal from the determination unit when the mode is determined to be the magnetic security transmission mode;
A second signal processing unit receiving the radio signal from the determination unit when the wireless power transmission mode is determined;
≪ / RTI >
Wireless power receiver. 9. The method of claim 8,
An MST module for receiving a first control signal generated from the first signal processor; And
A wireless charging module for receiving a second control signal generated from the second signal processor;
≪ / RTI >
Wireless power receiver. The method according to claim 1,
A rectifier for converting a voltage or a current applied from the determination unit into a predetermined voltage according to the antenna mode;
≪ / RTI >
Wireless power receiver. The method according to claim 1,
When the duplex antenna receives a radio signal including a message indicating an end of the antenna mode, the switching unit blocks the selected transmission path,
Wireless power receiver. Receiving a radio signal by a dual antenna for Magnetic Secure Transmission (MST) and Wireless Power Transmission (WPT);
Determining an antenna mode based on the wireless signal; And
Switching the transmission path of the radio signal according to the determined antenna mode;
/ RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
The combined antenna includes a near field communication (NFC) antenna,
A method of controlling a wireless power receiver. 13. The method of claim 12,
Wherein determining the antenna mode comprises:
Determining an antenna mode using a magnitude of a current or voltage generated in the dual antenna by the radio signal;
/ RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
Wherein determining the antenna mode comprises:
Determining an antenna mode using a change amount of a current or a voltage generated in the dual antenna by the radio signal;
/ RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
Wherein determining the antenna mode comprises:
Determining an antenna mode using a ping signal received from the dual antenna;
≪ / RTI >
A method of controlling a wireless power receiver. 17. The method of claim 16,
Wherein determining the antenna mode comprises:
Determining an antenna mode using a period or frequency of the ping signal;
≪ / RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
Wherein determining the antenna mode comprises:
Determining either one of a magnetic security transmission mode and a wireless power transmission mode;
/ RTI >
A method of controlling a wireless power receiver. 19. The method of claim 18,
Receiving, by the first signal processing unit, the radio signal through the switching unit when determining the magnetic security transmission mode; And
Receiving, by the second signal processing unit, the radio signal through the switching unit when the radio power transmission mode is determined;
≪ / RTI >
A method of controlling a wireless power receiver. 20. The method of claim 19,
The MST module receiving a first control signal generated from the first signal processor; And
The wireless charging module receiving a second control signal generated from the second signal processor;
≪ / RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
Converting the voltage or current received from the determination unit into a predetermined voltage according to the antenna mode;
≪ / RTI >
A method of controlling a wireless power receiver. 13. The method of claim 12,
When the combined antenna receives a radio signal including a message indicating an end of the antenna mode, the switching unit blocks the selected transmission path;
≪ / RTI >
A method of controlling a wireless power receiver. A computer-readable recording medium storing a program for executing the method according to any one of claims 12 to 22.

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