KR20170130974A - Method of Operating Apparatus for Receiving Wireless Power in Multi-mode - Google Patents

Abstract

A method of operating a multimode receiver capable of wirelessly receiving power simultaneously in a resonance mode and an induction mode according to an embodiment of the present invention includes a step of determining whether an event related to the induction mode during charging by the resonance mode is generated or not; a step of receiving power by the induction mode when the event is generated; a step of measuring a resonance voltage according to the power received by the resonance mode and an induction voltage according to the power received by the induction mode; and a step of comparing the sum of the resonance voltage and the induction voltage with a threshold voltage that is a threshold voltage value at which a voltage applied to a load become an over voltage, and determining whether to simultaneously charge in the resonance mode and the induction mode. It is possible to optimize a wireless power transfer mode.

Description

TECHNICAL FIELD The present invention relates to a method of operating a multi-mode receiver,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless power transmission technique, and more particularly, to a method of operating a multimode receiver capable of receiving wireless power simultaneously with an electromagnetic resonance method and an electromagnetic induction method.

Recently, as the information and communication technology rapidly develops, a ubiquitous society based on information and communication technology is being made.

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

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

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

In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, . The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.

The self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents. The self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.

Short wavelength wireless power transmission - simply, RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.

Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.

In the operation of a multimode receiver capable of simultaneously receiving power in an electromagnetic resonance mode and an electromagnetic induction mode of a wireless power receiver, when it is detected that power can be received in another mode while receiving power in a particular mode, Receiving power in other modes may cause overvoltage, overcurrent, and overcurrent, which may cause damage to the receiver.

Also, in order to prevent such a phenomenon, there is a problem that when the power is not received in any other mode during the power transmission in the specific mode, the advantage of the multimode receiver capable of simultaneous charging by the two modes can not be utilized at all.

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 method of operating a multimode receiver.

Another object of the present invention is to provide a method of operating a multimode transmitter capable of optimizing a wireless power transmission mode when power reception by another mode is possible during power reception in a specific mode.

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

The present invention can provide a method of operating a multimode transmitter.

A method of operating a multimode receiver capable of wirelessly receiving power simultaneously in a resonant mode and an inductive mode according to an embodiment of the present invention includes determining whether an event related to a charging inductive mode by the resonant mode occurs, ; Receiving power by the induction mode when the event is generated; Measuring a resonance voltage according to the power received by the resonance mode and an induced voltage according to the power received by the induction mode; And determining whether to simultaneously charge the sum of the resonance voltage and the induced voltage by comparing the sum of the resonance voltage and the induced voltage with the threshold voltage that is a threshold voltage value that causes the voltage applied to the load to become an over voltage, .

Controlling the first switch and the second switch such that when the sum of the resonance voltage and the induced voltage is less than the threshold voltage, the resonance mode and the power received by the induction mode are simultaneously transferred to the load, As shown in FIG.

According to an embodiment of the present invention, when the sum of the resonance voltage and the induced voltage is equal to or greater than the threshold voltage, the maximum voltage among the resonance voltage and the induced voltage is compared with the threshold voltage, And determining whether to charge the battery.

According to an embodiment, if the maximum voltage is less than the threshold voltage, controlling the first switch and the second switch such that the power received by the mode corresponding to the maximum voltage is transferred to the load.

According to an embodiment, when the maximum voltage is equal to or higher than the threshold voltage, controlling the first switch and the second switch such that the power received by the mode corresponding to the minimum voltage is transferred to the load.

According to an embodiment, the event may be that an identification signal according to the guidance mode is received by the multimode receiver.

A method of operating a multimode receiver capable of simultaneously receiving power wirelessly in a resonant mode and an inductive mode according to another embodiment of the present invention includes the steps of determining whether an event related to the in- ; Receiving power by the induction mode when the event is generated; Measuring a resonance voltage according to the power received by the resonance mode and an induced voltage according to the power received by the induction mode; Comparing the sum of the resonance voltage and the induced voltage with a threshold voltage that is a threshold voltage value that causes a voltage applied to the load to become an excess voltage to determine whether to simultaneously charge the resonance mode and the induction mode; And requesting reduction of the transmission power for the other mode while charging in either the resonance mode or the induction mode when simultaneous charging in the resonance mode and the induction mode is impossible .

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

Effects of the wireless power transmission apparatus and the power control method according to the present invention will be described as follows.

According to another exemplary embodiment of the present invention, when the multimode receiver is changed from a resonance mode to a chargeable state during charging, it is detected that an optimal wireless power reception mode Can be selected to perform charging.

In addition, when the overvoltage is expected to occur, the charging operation is performed in one wireless power receiving mode while the output voltage of the receiver corresponding to the other wireless power receiving mode is decreased in conjunction with the multimode transmitter, thereby operating in the simultaneous charging mode And can exhibit the maximum power transmission efficiency.

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 structure of a wireless power receiver supporting multi-mode according to an embodiment of the present invention.
3 is a block diagram illustrating a structure of a resonant receiver according to an embodiment of the present invention.
4 is a block diagram for explaining a structure of an inductive transmitter interlocked with the inductive receiver according to FIG.
5 is a block diagram illustrating a structure of an inductive receiver according to an embodiment of the present invention.
6 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
7 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.
8 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment of the present invention.
9 is a state transition diagram for explaining a state transition procedure in a wireless power transmitter supporting an electric resonance system according to an embodiment of the present invention.
10 is a view for explaining the operation of a multimode receiver according to an embodiment of the present invention.
11 is a flowchart illustrating an operation method of a multimode receiver according to an embodiment of the present invention.
12 is a flowchart illustrating an operation method of a multimode receiver according to another embodiment of the present invention.
13 is a block diagram illustrating a structure of a multimode receiver 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.

In the description of the embodiment, in the case where it is described as being formed "above" or "below" each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, in the case of "upper (upper) or lower (lower)", it may include not only an upward direction but also a downward direction based on one component.

In the description of the embodiments, an apparatus equipped with a function of transmitting wireless power on a wireless charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, , A transmitting side, a wireless power transmission device, a wireless power transmitter, and the like are used in combination. Further, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, A receiver, a receiver, and the like can be used in combination.

The transmitter 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, a wall type, Power can also be transmitted. To this end, the transmitter may comprise at least one radio power transmission means. Here, the radio power transmitting means may be various non-electric power transmission standards based on an electromagnetic induction method in which a magnetic field is generated in a power transmitting terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving terminal coil under the influence of the magnetic field. Here, the wireless power transmission means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means, and may receive wireless power from two or more transmitters at the same time. Here, the wireless power receiving means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.

The receiver 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, A portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, a smart watch, etc. However, the present invention is not limited thereto. It suffices.

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 transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 20 Lt; / RTI >

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

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

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

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

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

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

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

2 is a block diagram illustrating a structure of a wireless power receiver supporting multi-mode according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power receiver 200 may correspond to the wireless power receiving terminal 20 shown in FIG. The wireless power receiver 200 includes a resonant receiver 210, an inductive receiver 220, a main controller 230, a first switch 240, a second switch 250, a DC / DC converter 260, (270). ≪ / RTI > But is not limited thereto.

The resonant receiver 210 is a device that receives power wirelessly from a transmitter in an electromagnetic resonance manner and can operate in accordance with the A4WP standard. The detailed configuration and operation of the resonant receiver 210 will be described later with reference to FIG.

Inductive receiver 220 is a device that receives power wirelessly from a transmitter in an electromagnetic induction manner and can operate in accordance with PMA or WPC standards. The detailed configuration and operation of the inductive receiver 220 will be described later with reference to Figs.

The main control unit 230 may control the overall operation of the wireless power receiver 200. [ In particular, the main control unit 230 may adaptively determine a wireless power reception mode based on the state of the wireless power receiver (e.g., temperature, overvoltage / overcurrent / overpower, and the like) 210, an inductive receiver 220, a first switch 240, and a second switch 250.

The wireless power receiver 200 is a multimode receiver that supports both electromagnetic induction and electromagnetic resonance modes. The multimode receiver is a multi-mode transmitter that supports both electromagnetic induction and electromagnetic resonance as well as a wireless charging service Can be provided. At this time, the multimode receiver can receive power from at least one transmitter.

The wireless charging mode selection and switching procedure between the multi-mode transmitter and the multi-mode receiver can be transparent to the user without any user intervention.

The multimode receiver can be divided into a first multimode receiver and a second multimode receiver depending on whether simultaneous power transmission to an electromagnetic resonance system and an electromagnetic induction system is possible.

The first multimode receiver may simultaneously receive power in an electromagnetic resonance mode and an electromagnetic induction mode.

The first multimode receiver transmits and receives signals to and from a wireless power transmitter in accordance with a receiver sensing procedure defined by an electromagnetic resonance method and an electromagnetic induction method performed by time division interleaving, A session establishment procedure can be performed. At this time, if the session establishment procedure is started, the receiver detection procedure may be immediately terminated. There is no particular restriction on the time and order in which the receiver detection signal is transmitted according to the wireless charging mode in the electromagnetic resonance method for receiver detection and the electromagnetic induction method for time division interleaving. However, Should be defined to meet time requirements.

The first multimode receiver also transmits and receives signals to and from a wireless power transmitter in accordance with a receiver sensing procedure defined by a single mode transmitter and an electromagnetic resonance or electromagnetic induction method and provides a session with the transmitter in a wireless charging mode corresponding to a single mode transmitter, You can perform the setup procedure.

If the session establishment procedure is not normally completed, the receiver detection procedure may be resumed for the first multimode receiver.

The first multimode receiver may transmit a predetermined response signal indicating that it is a multimode receiver to the multimode transmitter side. When it is confirmed that the multimode transmitter is a multimode receiver, it can be determined whether switching to the alternative mode is necessary. As a result of the determination, if it is necessary to switch to the alternative mode, the multimode transmitter can perform a predetermined switching procedure to the alternative mode. On the other hand, if switching to the alternative mode is not required, the multimode transmitter may maintain the current operating mode and provide a wireless charging service.

The first multimode receiver sets a session according to the different wireless charging mode when receiving an identification signal (for example, digital ping) from another wireless charging mode while receiving wireless power in any wireless charging mode Other wireless charging modes can also receive wireless power simultaneously.

The second multimode receiver may only operate in any one of the wireless charging modes at any one time.

The second multimode receiver may not respond to the receiver sensing procedure for the other wireless charging mode while receiving the wireless power in any one of the wireless charging modes.

The first multimode receiver or the second multimode receiver may provide a predetermined user interface for enabling the user to identify the currently active wireless charging mode. For example, the currently active wireless charging modes may be displayed using LEDs having different colors, but this is only one embodiment, and another embodiment of the present invention is a wireless charging system, Mode may be displayed.

The first multimode receiver and the second multimode receiver may broadcast a predetermined receiver multimode broadcast message for informing the transmitter of the multimode capability. Here, the receiver multi-mode broadcast message may include information for identifying a wireless charging mode that can be supported, information about a power rating for each wireless charging mode that can be supported, and the like.

The multimode receiver may be different from the message indicating the charging status information transmitted to the transmitter according to the activated wireless charging mode. For example, in the A4WP standard of the electromagnetic resonance method, a PRU (Power Receiving Unit) Alert message for reporting to the transmitter that charging is completed is defined. On the other hand, an EOC (End of Charge) request message for reporting to the transmitter that charging is completed is defined in the electromagnetic induction PMA standard.

In this specification, the wireless power receiver 200 will be described on the premise that it is the first multimode receiver. As described above, the wireless power receiver 200 adaptively determines the wireless power receiving mode based on the characteristics and status of the wireless power receiver 200 and the like.

For example, when the wireless power transmission mode supported by the wireless power transmitter connected to the wireless power receiver 200 is the electromagnetic resonance mode and power according to the electromagnetic resonance mode is received, the main control unit 230 receives The first switch 240 may be controlled so that the power supplied to the DC-DC converter 260 may be supplied to the DC-DC converter 260. [ In another example, when the wireless power transmission mode supported by the wireless power transmitter connected to the wireless power receiver 200 is an electromagnetic induction mode and power according to the electromagnetic induction mode is received, the main controller 230 controls the inductive receiver 220 The second switch 250 can be controlled so that the received power can be supplied to the DC-DC converter 260. [ In another example, when it is confirmed that the wireless power transmission mode supported by the wireless power transmitter connected to the wireless power receiver 200 is an electromagnetic induction mode and an electromagnetic resonance mode, The first switch 240 and the second switch 250 may be controlled such that the power received by the inductive receiver 210 and the inductive receiver 220 may be supplied to the DC-DC converter 260 at the same time.

If it is determined that the wireless power transmission mode supported by the wireless power transmitter connected to the wireless power receiver 200 is an electromagnetic induction mode and an electromagnetic resonance mode and is a simultaneous transmittable receiver, ), It is possible to determine an optimal wireless power reception mode through a predetermined algorithm to obtain maximum power transmission efficiency without being supplied with overvoltage / overcurrent / overpower.

Each of the first switch 240 and the second switch 250 may be opened and closed under the control of the main controller 230 and the power output from the resonant receiver 210 and the inductive receiver 220 may be supplied to the DC- (Not shown).

Each of the first switch 240 and the second switch 250 may be a directional element such as a diode for passing charge in only one direction within a predetermined voltage range, A Zener diode, a Schottky diode, a light emitting diode (LED), a TVS diode (Transient Voltage Suppression Diode), a transistor (e.g., a MOSFET), or the like.

The DC-DC converter 260 may convert the rectified DC voltage delivered from the resonant receiver 210 and / or the inductive receiver 220 to a specific DC voltage required by the load 270. 3 or FIG. 5, the DC-DC converters 356 and 530 may be connected to the output terminal of the resonant receiver 210 or the inductive receiver 220. The rectifier 354 of FIG. 3 or the rectifier 520 of FIG. And loads 358 and 540 are included in the receiver, but this is for convenience of illustration.

The load 270 may be charged or operated using the power delivered from the DC-DC converter 260 and may also be implemented as part of the electronic device 30 of FIG.

3 is a block diagram illustrating a structure of a resonant receiver according to an embodiment of the present invention.

Referring to FIG. 3, the wireless power transmission system may include a wireless power transmitter 300 and a wireless power receiver 350 . The wireless power receiver 300 may correspond to the resonant receiver 210 shown in FIG.

3, the wireless power transmitter 300 is shown transmitting wireless power to one wireless power receiver 200, but this is merely an example, and wireless power 300 according to another embodiment of the present invention Transmitter 300 may also transmit wireless power to a plurality of wireless power receivers 350. It should be noted that the wireless power receiver 350 according to yet another embodiment may receive wireless power from a plurality of wireless power transmitters 300 at the same time.

The wireless power transmitter 300 may generate a magnetic field using a specific power transmission frequency to transmit power to the wireless power receiver 350. [

The wireless power receiver 350 can receive power by tuning to the same frequency as that used by the wireless power transmitter 300. [

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 300 may be communicated to a wireless power receiver 350 that is in resonance with the wireless power transmitter 300.

The maximum number of wireless power receivers 350 capable of receiving power from one wireless power transmitter 300 is determined by the maximum transmission power level of the wireless power transmitter 300, the maximum power reception level of the wireless power receiver 350, May be determined based on the physical structure of the power transmitter 300 and the wireless power receiver 350.

The wireless power transmitter 300 and the wireless power receiver 350 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 300 and the wireless power receiver 350 may exchange their characteristics and status information, i.e., power negotiation information, via the two-way communication.

In one example, the wireless power receiver 350 may transmit certain power reception state information for controlling the power level received from the wireless power transmitter 300 to the wireless power transmitter 300 via bi-directional communication, 300 can dynamically control the transmit power level based on the received power reception state information. Accordingly, the wireless power transmitter 300 not only can optimize the power transmission efficiency, but also has a function of preventing a load breakage due to an over-voltage, a function of preventing unnecessary power from being wasted due to an under-voltage And the like can be provided.

The wireless power transmitter 300 also performs functions such as authenticating and identifying the wireless power receiver 350 via bi-directional communication, identifying incompatible devices or non-chargeable objects, identifying a valid load, and the like You may.

Hereinafter, the wireless power transmission process of the resonance method will be described in more detail.

The wireless power transmitter 300 includes a power supplier 302, a power conversion unit 304, a matching circuit 306, a transmission resonator 308, a transmitter controller 304, 310, and a communication unit (312).

The power supply unit 302 may supply a specific supply voltage to the power conversion unit 304 under the control of the transmitter control unit 310. At this time, the supply voltage may be a DC voltage or an AC voltage.

The power conversion unit 304 may convert the voltage received from the power supply unit 302 to a specific voltage under the control of the transmitter control unit 310. [ For this, the power conversion unit 304 may include at least one of a DC / DC converter, an AC / DC converter, and a power amplifier.

The matching circuit 306 is a circuit that matches impedances between the power conversion section 304 and the transmission resonator 308 to maximize the power transmission efficiency.

The transmitting resonator 308 can transmit power wirelessly using a specific resonance frequency according to the voltage applied from the matching circuit 306. [

The wireless power receiver 350 includes a reception resonator 352, a rectifier 354, a DC-DC converter 356, a load 358, a first controller 352, 360, and a communication unit (communication unit) 362.

The reception resonator 352 can receive the power transmitted by the transmission resonator 308 through the resonance phenomenon.

The rectifier 354 can perform the function of converting the AC voltage applied from the reception resonator 352 to a DC voltage.

The DC-to-DC converter 356 may convert the rectified DC voltage to a specific DC voltage required by the load 358.

The first control unit 360 may control the operation of the rectifier 354 and the DC-DC converter 356 or may generate the characteristic and status information of the wireless power receiver 350 and transmit it to the communication unit 362. For example, the first control unit 360 monitors the output voltage and current intensity at the rectifier 354 and the DC-DC converter 356 to control the operation of the rectifier 354 and the DC-DC converter 356 .

The monitored output voltage and current intensity information can be transmitted to the wireless power transmitter 300 through the communication unit 362 in real time.

In addition, the first controller 360 compares the rectified DC voltage with a predetermined reference voltage to determine whether it is an over-voltage state or an under-voltage state, The wireless power transmitter 300 may transmit the detection result to the wireless power transmitter 300 through the communication unit 362. [

The first controller 360 controls the operation of the rectifier 354 and the DC-DC converter 356 to prevent damage to the load when a system error condition is detected, or to control the operation of the rectifier 354 and the DC-DC converter 356, An overcurrent shutoff circuit may be used to control the power applied to the load 358. [

3, the control unit 310 or 360 and the communication unit 312 or 362 of the transceiver are respectively configured as different modules, but this is merely one embodiment, and another embodiment of the present invention is not limited thereto. It should be noted that the control unit 310 or 360 and the communication unit 312 or 362 may be configured as a single module.

The wireless power transmitter 300 according to an exemplary embodiment of the present invention may include a wireless power transmitter 300 to which a new wireless power receiver is added during charging, a connection to a wireless power receiver that is being charged is disconnected, If an event is detected, it may perform a power redistribution procedure for the remaining rechargeable wireless power receivers. At this time, the power redistribution result may be transmitted to the connected wireless power receiver (s) via out-of-band communication.

4 is a block diagram for explaining a structure of an inductive transmitter interlocked with the inductive receiver according to FIG.

4, the wireless power transmitter 400 includes a power conversion unit 410, a power transmission unit 420, a communication unit 430, a transmitter control unit 440, and a sensing unit 450 . It should be noted that the configuration of the wireless power transmitter 400 described above is not necessarily an essential configuration, and may be configured to include more or less components.

As shown in FIG. 4, when the power is supplied from the power supply unit 460, the power conversion unit 410 may convert the power to a predetermined intensity.

For this, the power conversion unit 410 may include a DC / DC conversion unit 411 and an amplifier 412.

The DC / DC converting unit 411 may convert DC power supplied from the power supply unit 450 into DC power having a specific intensity according to a control signal of the controller 440.

At this time, the sensing unit 450 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the controller 440. In addition, the sensing unit 450 may measure the internal temperature of the wireless power transmitter 400 and may provide the measurement result to the controller 440 in order to determine whether overheating occurs. For example, the control unit 440 may block the power supply from the power supply unit 450 adaptively based on the voltage / current value measured by the sensing unit 450 or may block the supply of power to the amplifier 412 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 410 to cut off the power supplied from the power supply unit 450 or cut off power supplied to the amplifier 412.

The amplifier 412 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 440. For example, the control unit 440 may receive the power reception status information and / or the power control signal of the wireless power receiver through the communication unit 430 and may receive the power control information based on the received power reception status information and / So that the amplification factor of the amplifier 412 can be dynamically adjusted. For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmitting unit 420 may be configured to include a multiplexer 421 (or a multiplexer), a transmitting coil 422, and the like. In addition, the power transmitting unit 420 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 412 transmitted through the multiplexer 421 to AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer 421 to generate AC power. However, this is merely one embodiment, and another example is that before the amplifier 412 It should be noted that they may be mixed only or later.

It should be noted that the frequencies of the AC power delivered to each transmit coil in accordance with an embodiment of the present invention may be different from each other. In another embodiment of the present invention, the resonance frequency of each transmission coil may be set differently by using a predetermined frequency controller having a function of controlling LC resonance characteristics for different transmission coils.

The power transmission unit 420 includes a multiplexer 421 and a plurality of transmission coils 422, i.e., first to n-th transmission coils, for controlling the output power of the amplifier 412 to be transmitted to the transmission coil .

The controller 440 according to an embodiment of the present invention may transmit power through time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected. For example, if three wireless power receivers-i. E., First through third wireless power receivers-are each identified through three different transmit coils-i. E., First through third transmit coils-in the wireless power transmitter 400 , The control unit 440 controls the multiplexer 421 so that power can be transmitted through a specific transmission coil in a specific time slot. At this time, the amount of power transmitted to the corresponding wireless power receiver can be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. The amplification rate of the amplifier 412 of the wireless power receiver may be controlled to control the transmission power of each wireless power receiver.

The control unit 440 may control the multiplexer 421 so that the detection signals may be sequentially transmitted through the first to n'th transmission coils 422 during the first detection signal transmission procedure. At this time, the control unit 440 can identify the time at which the sensing signal is transmitted using the timer 455. When the sensing signal transmission time arrives, the controller 440 controls the multiplexer 421 to output a sensing signal It can be controlled to be transmitted. For example, the timer 450 may transmit a specific event signal to the control unit 440 at predetermined intervals during the ping transmission step. When the event signal is detected, the control unit 440 controls the multiplexer 421 to transmit the corresponding event signal It is possible to control the digital ping to be transmitted through the coil.

In addition, the control unit 440 transmits a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 432 during the first detection signal transmission procedure, Lt; / RTI > received signal strength indicator. In the second sensing signal sending process, the controller 440 controls the multiplexer 421 so that the signal strength indicator can be transmitted through the transmitting coil (s) You may. In another example, when there are a plurality of transmit coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 440 transmits the received transmit coil with the signal strength indicator having the largest value as the second differential sense signal In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 421 may be controlled according to the determination result.

The modulator 431 modulates the control signal generated by the controller 440 and transmits the modulated signal to the multiplexer 421. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 432 can demodulate the detected signal and transmit the demodulated signal to the controller 440 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

The demodulation unit 432 can identify which demodulated signal is received from which transmission coil, and provide the control unit 440 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

 The demodulation unit 432 can demodulate the signal received through the transmission coil 823 and transmit the demodulated signal to the control unit 440. In one example, the demodulated signal may include, but is not limited to, a signal strength indicator, and the demodulated signal may include various status information of the wireless power receiver.

For example, the wireless power transmitter 400 may acquire the signal strength indicator through in-band communication using the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 400 can transmit wireless power using the transmit coil 422, as well as exchange various information with the wireless power receiver via the transmit coil 422. [ In another example, the wireless power transmitter 400 may further include a separate coil corresponding to each of the transmit coil 422 (i.e., first to n < th > transmit coils) It should be noted that it may also perform in-band communication with the receiver.

In the description of FIG. 4, the wireless power transmitter 400 and the wireless power receiver perform in-band communication. However, the wireless power transmitter 400 is only one embodiment, Directional communication through different frequency bands. For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

In particular, the wireless power transmitter 400 according to an embodiment of the present invention may adaptively provide a fast charge mode and a general low power charge mode at the request of the wireless power receiver.

The wireless power transmitter 400 may send a signal of a predetermined pattern, which is called a first packet, for convenience of explanation, when the fast charging mode is supported. The wireless power receiver can identify when the first packet is received that the wireless power transmitter 400 being connected is capable of fast charging.

In particular, the wireless power receiver may send a first response packet to the wireless power transmitter 400 requesting fast charging if fast charging is required.

In particular, the wireless power transmitter 400 may automatically switch to the fast charge mode and initiate fast charge when a predetermined time has elapsed after the first response packet is received.

For example, when the control unit 440 of the wireless power transmitter 400 transits to the power transmission step 640 or 740 shown in FIGS. 6 to 7 to be described later, the control unit 440 controls the first packet to be transmitted through the transmission coil 422 However, this is only an example, and another example of the present invention may be the first packet sent out in the identifying and configuring step 630 of FIG. 6 or the identifying step 730 of FIG.

It should be noted that another embodiment of the present invention may transmit encoded information that can identify whether or not fast charge support is possible to the digital ring signal transmitted by the wireless power transmitter 400. [

The wireless power receiver may send a predetermined charging mode packet to the wireless power transmitter 400 where the charging mode is set to fast charge if fast charging is required at any point in the power transfer phase. Of course, the wireless power transmitter 800 and the wireless power receiver can control the internal operation so that power corresponding to the fast charge mode can be sent and received when the charge mode is changed to the fast charge mode. For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the overvoltage determination criterion, the over temperature criterion, the low-voltage / high- Level (Optimum Voltage Level), power control offset, and the like can be changed and set.

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

5 is a block diagram illustrating a structure of an inductive receiver according to an embodiment of the present invention.

5, the wireless power receiver 500 includes a receiving coil 510, a rectifier 520, a DC / DC converter 530, a load 540, a sensing unit 550, 560, and a second control unit 570. Here, the communication unit 560 may include a demodulation unit 561 and a modulation unit 562. The wireless power receiver 500 may correspond to the inductive receiver 220 shown in FIG.

Although the wireless power receiver 500 shown in the example of FIG. 5 is shown as being capable of exchanging information with the wireless power transmitter 400 through in-band communication, this is only one embodiment, The communication unit 560 according to another embodiment of the present invention may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

AC power received via the receive coil 510 may be delivered to the rectifier 520. The rectifier 520 may convert the AC power to DC power and transmit it to the DC / DC converter 530. The DC / DC converter 530 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 540 and then forward it to the load 540.

The sensing unit 550 may measure the intensity of the DC power output from the rectifier 520 and provide the measured DC power to the second controller 570. Also, the sensing unit 550 may measure the intensity of the current applied to the reception coil 510 according to the wireless power reception, and may transmit the measurement result to the second control unit 570. The sensing unit 550 may measure the internal temperature of the wireless power receiver 500 and provide the measured temperature value to the second control unit 570.

For example, the second controller 570 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage occurs, a predetermined packet indicating that an overvoltage has occurred can be generated and transmitted to the modulating unit 562. [ Here, the signal modulated by the modulating unit 562 may be transmitted to the wireless power transmitter 400 via the receiving coil 510 or a separate coil (not shown). The second controller 570 may determine that the detection signal is received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value. When receiving the detection signal, the second controller 570 outputs a signal intensity indicator corresponding to the detection signal to the modulation unit The demodulator 561 may control the AC power signal between the receiving coil 510 and the rectifier 520 or the AC power signal between the rectifier 520 and the rectifier 520. [ The output DC power signal may be demodulated to identify whether or not the detection signal is received, and the identification result may be provided to the second controller 570. [ At this time, the second controller 570 can control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulator 561. [

In particular, the second controller 570 according to an embodiment of the present invention may determine whether the connected wireless power transmitter is a wireless power transmitter capable of fast charging based on the information demodulated by the demodulator 560. [

1, the second controller 570 generates a charge mode packet corresponding to the received fast charge request signal and outputs the generated charge mode packet to the electronic controller 30, Unit 561, as shown in FIG. Here, the fast charge request signal from the electronic device can be received according to the user menu selection on the predetermined user interface.

The second controller 570 according to another embodiment of the present invention can automatically request the wireless power transmitter to charge the wireless power transmitter based on the battery remaining amount or to transmit the wireless power to the wireless power transmitter The power transmitter may also be controlled to stop fast charging and switch to a normal low power charging mode.

The second controller 570 according to another embodiment may monitor the power consumption of the electric device during charging to the general low-power charging mode in real time. If the power consumption of the electronic apparatus is equal to or greater than a predetermined reference value, the second control unit 570 may generate a predetermined charging mode packet requesting switching to the fast charging mode and transmit the packet to the modulation unit 561.

The second controller 570 according to another embodiment of the present invention may determine whether overheating occurs by comparing the internal temperature measured by the sensing unit 550 with a predetermined reference value. If overheating occurs during the fast charging, the second controller 570 may generate and transmit the charging mode packet so that the wireless power transmitter switches to the general low power charging mode.

The second controller 570 according to another exemplary embodiment of the present invention may control the charging mode based on at least one of the battery charging rate, the internal temperature, the intensity of the rectifier output voltage, the CPU usage rate, If it is determined that the change of the charging mode is required, the charging mode packet generating unit may generate a charging mode packet including the changed charging mode value and transmit the packet to the wireless power transmitter.

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

Referring to FIG. 6, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 610, a ping phase 620, an identification and configuration phase 630, And a power transfer phase (step 640).

The selection step 610 may be a step where a certain error or a specific event is detected while the power transmission is started or the power transmission is maintained. Here, the specific error and the specific event will become clear through the following description. Also, in a selection step 610, the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object is placed on the interface surface, it may transition to a ping step 620 (S601). In the selection step 610, the transmitter transmits an analog ping signal of a very short pulse and can detect whether an object exists in the active area of the interface surface based on the current change of the transmission coil.

In step 620, the transmitter activates the receiver when an object is detected, and transmits a Digital Ping to identify whether the receiver is a WPC compliant receiver. If the transmitter does not receive a response signal to the digital ping (e. G., A signal strength indicator) from the receiver in step 620, it may transition back to the selection step 610 (S602). Also, in step 620, the transmitter may transition to a selection step 610 when receiving a signal indicating completion of power transmission from the receiver, that is, a charging completion signal (S603).

Once the ping step 620 is complete, the transmitter may transition to an identification and configuration step 630 for collecting receiver identification and receiver configuration and status information (S604).

In the identifying and configuring step 630, the transmitter determines whether a packet is received (unexpected packet), a desired packet is not received for a predefined period of time (time out), a packet transmission error, (No power transfer contract), the process can be shifted to the selection step 610 (S605).

Once the identification and configuration for the receiver is complete, the transmitter may transition to power transfer step 640, which transmits the wireless power (S606).

In the power transfer step 640, the transmitter may determine that the unexpected packet is received, the desired packet is not received for a predefined period of time (time out), a violation of the predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the transition to the selection step 610 can be made (S607).

Further, in the power transfer step 640, if the transmitter needs to reconfigure the power transfer contract according to changes in the transmitter state, etc., it may transition to the identification and configuration step 630 (S608).

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.

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

Referring to FIG. 7, power transmission from a transmitter to a receiver according to the PMA standard is largely divided into a standby phase 710, a digital ping phase 720, an identification phase 730, A power transfer phase step 740, and an end of charge phase step 750.

The waiting step 710 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 710, the transmitter may monitor whether an object is present on the Charging Surface. If the transmitter detects that an object has been placed on the charging surface, or if an RXID retry is in progress, then a digital transition may be made to step 720 (S701). Here, RXID is a unique identifier assigned to a PMA compatible receiver. At the standby step 710, the transmitter transmits a very short pulse of analog ping 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 phase 720 sends a digital finger signal to identify whether the sensed object is a PMA compatible receiver. When sufficient power is supplied to the receiving end by the digital ding signal transmitted by the transmitter, the receiver can modulate the received digital ding 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 720, the receiver may transition to an identifying step 730 if a valid response signal is received (S702).

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 720, the transmitter may transition to a wait step 710 (S703). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 730, the transmitter may transition to the waiting step 710 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 S704).

If the transmitter succeeds in identifying the receiver, the transmitter can transition to power transfer step 740 in the identification step 730 and start charging (S705).

In a power transfer step 740, the transmitter determines if the desired signal is not received within a predetermined time (Time Out), when an FO is detected, or if the voltage of the transmit coil exceeds a predefined reference value, (S706).

In addition, in the power transmission step 740, 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 750 (S707).

In the charge completion step 750, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter may transition to the standby state 710 (S709).

Also, if the measured temperature drops below the reference value after a predetermined time elapses in the over temperature state, the transmitter may transition from the charging completion step 750 to the digital tipping step 720 (S710).

In the digital ping phase 720 or the power transfer phase 740, the transmitter may transition to the charge completion phase 750 (S708 and S711) when an End Of Charge (EOC) request is received from the receiver.

8 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method 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 may establish an out-of-band communication link with the wireless power transmitter and wait until the V _RECT value reaches the power required at the load end.

The wireless power receiver in the boot state 820 may transition to the active state 830 and begin charging when the V _RECT value is ascertained that the power required at the lower stage has been reached.

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 transition to the inactive state 810 if the V _RECT value falls below the V _{RECT_BOOT} value.

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

9, the state of the wireless power transmitter is largely divided into a configuration state 910, a power save state 920, a low power state 930, a power transfer state 930, 940, a Local Fault State 950, and a Latching Fault State 960.

When power is applied to the wireless power transmitter, the wireless power transmitter can transition to the configuration state 910. [ The wireless power transmitter may transition to a power saving state 920 when a predetermined reset timer expires in the configuration state 910 or the initialization procedure is completed.

In the power saving state 920, the wireless power transmitter may generate a beacon sequence and transmit it via the resonant frequency band.

Here, the wireless power transmitter can control the beacon sequence to be started within a predetermined time after entering the power saving state 920. [ 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 transition 920.

In the power saving state 920, the wireless power transmitter periodically generates and transmits a first beacon sequence (first beacon sequence) for detecting the presence or absence of a conductive object on the charged area, and changes the impedance of the receiving resonator, Load Variation- can be detected.

Also, in the power saving state 920, the wireless power transmitter may periodically generate and transmit a predetermined second beacon sequence (Second Beacon Sequence) for identifying the sensed object. At this time, the transmission timing of the beacon may be determined such that the first beacon sequence and the second beacon sequence do not overlap with each other. Hereinafter, for convenience of explanation, the first beacon sequence and the second beacon sequence will be referred to as a short beacon sequence and a long beacon sequence, respectively.

In particular, the short beacon sequence can be transmitted is generated repeatedly with a conductive object, the standby power of the wireless power transmitter for a short interval so that it can be saved (t _{SHORT _BEACON)} a predetermined time interval (t _CYCLE) until it is detected on the charging area . For example, t _{SHORT _BEACON} is less than 30ms, t _CYCLE. However, each can be set to 250ms ± 5 ms but is not limited to this. Also, the current intensity of each short beacon included in the short beacon sequence is greater than a predetermined reference value, and can be gradually increased during a predetermined time period.

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

In addition, in the power saving state 920, the wireless power transmitter periodically generates and transmits the second beacon sequence-that is, the long beacon sequence-to provide sufficient power for the booting and response of the wireless power receiver .

That is, when the wireless power receiver is booted through the long beacon sequence, it can broadcast an appropriate response signal over the out-of-band communication channel and transmit it to the wireless power transmitter.

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

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

For example, the advertisement signal may include message identification information for identifying a message defined in the out-of-band communication standard, unique service identification information for identifying whether the wireless power receiver is legitimate or compatible with the wireless power transmitter, Information for identifying the category of the wireless power receiver, wireless power receiver authentication information, an overvoltage protection function, and an overvoltage protection function. 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 920 to a low power state 930, when an advertisement signal is received. 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 a predetermined control signal to initiate charging via out-of-band communication in the low power state 930, i.e., a predetermined control signal requesting the wireless power receiver to transmit power to the load, to the wireless power receiver, The state of the wireless power transmitter may transition from the low power state 930 to the power transfer state 940. [

If the out-of-band communication link establishment procedure or registration procedure in the low power state 930 is not completed normally, the state of the wireless power transmitter may transition from the low power state 930 to the power saving state 920. [

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 930 or the power transfer state 940, May transition to power saving state 920. [

In addition, the wireless power transmitter in the low power state 930 may drive a predetermined registration timer upon receipt of a valid advertisement signal from the wireless power receiver. At this time, if the registration timer expires, the wireless power transmitter in low power state 930 may transition to power saving state 920. [ 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 940, the wireless power transmitter may transition to a low power state 930 upon completion of charging all connected wireless power receivers.

In particular, the wireless power receiver may allow registration of a new wireless power receiver in states other than the configuration state 910, the local failure state 950, and the lock failure state 960. [

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 940. [

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 may be configured to determine a power intensity to be received by a wireless power receiver based on at least one of the current available power, the priority of each wireless power receiver, May be adaptively determined. Here, the power intensity of each wireless power receiver can be determined, but not limited to, how much power should be received at a ratio of the maximum power that can be processed by the rectifier of the 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 based on the power intensity determined by the wireless power transmitter, and transmit the determination result to the wireless power transmitter through the predetermined power control response message.

The wireless power receiver according to another embodiment of the present invention transmits predetermined receiver state information indicating whether or not the wireless power control is possible according to the power control command of the wireless power transmitter to the wireless power transmitter before receiving the power control command It is possible.

The power transmission state 940 may be in any one of a first state 941, a second state 942 and a third state 943 depending on the power reception state of the connected wireless power receiver.

In one example, the first state 941 may indicate that the power reception state of all wireless power receivers connected to the wireless power transmitter is in a normal voltage state.

The second state 942 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 943 may mean that the power reception state of at least one wireless power receiver connected to the wireless power transmitter is in a high voltage state.

The wireless power transmitter may transition to a lock fault condition 960 if a system fault is detected in a power saving state 920 or a low power state 930 or a power transmission state 940

The wireless power transmitter of the lock fault condition 960 may transition to either a configuration state 910 or a power saving state 920 if all connected wireless power receivers are determined to have been removed from the charging area.

Further, in the lock fault condition 960, the wireless power transmitter may transition to a local fault condition 950 if a local fault is detected. Here, the wireless power transmitter, which is the local failure state 950, may transition back to the lock failure state 960 once the local failure is released.

On the other hand, when transitioning from a state of either configuration state 910, power saving state 920, low power state 930, or power transfer state 940 to local fault state 950, If released, it may transition to configuration state 910.

The wireless power transmitter may shut off the power supplied to the wireless power transmitter if it transitions to the local fault condition 950. [ For example, the wireless power transmitter may transition to a local fault condition (950) upon detection of a fault, such as overvoltage, overcurrent, or overtemperature, 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 960 if the intensity of the output current of the transmit resonator is above a reference value. At this time, the wireless power transmitter transited to the lock failure state 960 may attempt to make the intensity of the output current of the transmission resonator lower than a reference value for a predetermined time. Here, the attempt may be repeated for a predetermined number of times. If the lock failure condition 960 is not released despite repeated execution, the wireless power transmitter transmits a predetermined notification signal indicating that the lock failure state 960 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 960 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 repetitive execution, the lock failure state 960 is automatically released At which time the state of the wireless power transmitter may be automatically transitioned from the lockout fault state 960 to the power saving state 920 so that the detection and identification procedure for the wireless power receiver may be performed again.

The wireless power transmitter in the power transmission state 940 can transmit the continuous power and adaptively control the transmit power based on the state information of the wireless power receiver and the predefined optimal voltage region setting parameters have.

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

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

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

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

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

10 is a view for explaining the operation of a multimode receiver according to an embodiment of the present invention.

Referring to FIG. 10, a multimode receiver 1000 according to an embodiment of the present invention corresponds to the wireless power receiver 200 shown in FIG. The inductive charging region is an area in which the resonant receiver 210 is capable of receiving radio power by an electromagnetic resonance method and the inductive charging region is an area in which the inductive receiving region 220 is an electromagnetic induction type Quot; means an area where wireless power reception is possible.

The resonance charge area has a larger area than the induction charge area, and the induction charge area overlaps with the resonance charge area. That is, in the inductive charging region, wireless power reception is possible by both the electromagnetic resonance method and the electromagnetic induction method.

As shown in FIG. 10, it is assumed that the multimode receiver 1000 is located in the resonance charging area, not in the induction charging area. Accordingly, the multimode transmitter can not detect and identify the multimode receiver 1000 by the electromagnetic induction method, and detects and identifies the multimode receiver 1000 by the electromagnetic resonance method, Lt; / RTI >

Hereinafter, it is assumed that the multimode receiver 1000 moves to the induction charging area as shown in the lower part of FIG. In the case of moving, the position is adjusted by the user, or the vehicle is shaken, but the scope of the present invention is not limited thereto.

The multimode transmitter can recognize from the receiver multimode broadcast message received from the multimode receiver 1000 that the multimode receiver 1000 is a first multimode receiver that can be simultaneously charged by electromagnetic resonance and electromagnetic induction. The multimode transmitter transmits the analog ping for detecting the receiving coil of the inductive receiver 220 at regular intervals even during the wireless charging by the electromagnetic resonance method, It is possible to detect whether an object exists in the active area of the inductive charge area.

The multimode receiver 1000 can be connected to both the charging (resonance mode) by the electromagnetic resonance method, the charging by the electromagnetic induction method (the induction mode), the electromagnetic resonance method and the electromagnetic induction method (Simultaneous mode) by wireless power can be determined.

11 is a flowchart illustrating an operation method of a multimode receiver according to an embodiment of the present invention.

Referring to FIG. 11, the multimode receiver can recognize that a specific event related to the inductive charging mode by the resonance mode occurs (S 1100). Here, it is assumed that the multimode receiver is the multimode receiver 200 of FIG.

As shown in FIG. 10, when the multimode receiver is located in the resonance charging area and then moves to the induction charging area, the multimode transmitter can sense that an object exists in the induction charging area. The multimode receiver receives an identification signal (e.g., digital ping) to identify whether it is a receiver that supports charging by electromagnetic induction from a multimode transmitter, May mean receiving an identification signal according to the electromagnetic induction method.

The multimode receiver may transmit a response signal (e.g., a signal strength indicator) to the multimode transmitter in response to the identification signal (S1110). Then, the multimode receiver and the multimode transmitter can perform identification and configuration for power transmission by the electromagnetic induction method.

When the identification and the configuration with the multimode transmitter are completed, the multimode receiver can receive power by the multimode transmitter from the multimode transmitter (S1120). At this time, the multimode receiver is turned on so that the second switch 250 is opened to prevent a power due to the received inductive mode from being transmitted to the DC-DC converter 260 and generating an overvoltage in the load 270 Can be controlled. The second switch 250 may be kept open even when power is being received by the resonance mode, but the scope of the present invention is not limited thereto.

The multimode transmitter can measure the resonance voltage and the induced voltage, respectively (S1130). Herein, the resonance voltage means the output voltage of the resonant transmitter 210 and the induced voltage means the output voltage of the induction transmitter 220.

The multimode transmitter can determine whether the sum of the resonance voltage and the induced voltage is less than the threshold voltage (S1140). Here, the threshold voltage means a threshold voltage value in which the voltage applied to the load 270 becomes an overvoltage. The threshold voltage is set in advance in consideration of the required voltage of the load 270 and the conversion gain of the DC-DC converter 260 Can be determined. According to another embodiment, the threshold voltage may not be exactly equal to the threshold voltage value at which the voltage applied to the load 270 becomes an over voltage, and may be set to be somewhat lower than the threshold voltage value to more reliably prevent over voltage have.

The reason for determining whether the sum of the resonance voltage and the induced voltage is less than the threshold voltage is that if the sum of the resonance voltage and the induced voltage is greater than the threshold voltage, If the sum of the resonance voltage and the induction voltage is less than the threshold voltage, the excess voltage at the side of the load 270 is not generated. Therefore, simultaneously receiving the radio power through the resonance mode and the induction mode Charging mode) can increase the power transmission efficiency.

When the sum of the resonance voltage and the induced voltage is less than the threshold voltage (Yes in S1140), the multimode receiver can change the second switch 250 to a short state for the simultaneous charge mode. This allows the multimode receiver to operate in a simultaneous charging mode where the power received by each of the resonant receiver 210 and the inductive receiver 220 is transferred to the load 270.

If the sum of the resonance voltage and the induced voltage is equal to or higher than the threshold voltage (No in S1140), the multimode receiver can determine whether the maximum voltage (larger voltage) of the resonance voltage and the induced voltage is less than the threshold voltage (S1160).

When the maximum voltage of the resonance voltage and the induction voltage is less than the threshold voltage (Yes in S1160), it is expected that the overvoltage will not be generated regardless of which mode the resonance mode or the induction mode is performed. Charging may be performed in the corresponding mode (S1170).

For example, when the resonance voltage is the maximum voltage, the multimode receiver can keep the first switch 240 in the short state and the second switch 250 in the open state to perform charging in the resonance mode. Also, when the induced voltage is the maximum voltage, the multimode receiver can change the first switch 240 to the open state and the second switch 250 to the short state to perform charging in the inductive mode.

If the maximum voltage of the resonance voltage and the induced voltage is equal to or higher than the threshold voltage (No in S1160), it is expected that the overvoltage will occur when the charging is performed by the mode corresponding to the maximum voltage. The charging may be performed (S1180).

According to the method of operating a multimode receiver according to an embodiment of the present invention, when the multimode receiver is changed from a resonance mode to a state capable of simultaneously charging during charging, Can be selected to perform charging.

12 is a flowchart illustrating an operation method of a multimode receiver according to another embodiment of the present invention.

Referring to FIG. 12, the multimode receiver can recognize that a specific event occurs during charging by the resonance mode (S1200). Here, it is assumed that the multimode receiver is the multimode receiver 200 of FIG.

As shown in FIG. 10, when the multimode receiver is located in the resonance charging area and then moves to the induction charging area, the multimode transmitter can sense that an object exists in the induction charging area. The multimode receiver receives an identification signal (e.g., digital ping) to identify whether it is a receiver that supports charging by electromagnetic induction from a multimode transmitter, May mean receiving an identification signal according to the electromagnetic induction method.

The multimode receiver may transmit a response signal (e.g., a signal strength indicator) to the multimode transmitter in response to the identification signal (S1210). Then, the multimode receiver and the multimode transmitter can perform identification and configuration for power transmission by the electromagnetic induction method.

When the identification and the configuration with the multimode transmitter are completed, the multimode receiver can receive the power by the inductive mode from the multimode transmitter (S1220). At this time, the multimode receiver can control the second switch 250 to be opened so as to prevent a power due to the received inductive mode from being transmitted to the DC-DC converter 260 and generating an overvoltage in the load 270 have. The second switch 250 may be kept open even when power is being received by the resonance mode, but the scope of the present invention is not limited thereto.

The multimode transmitter can measure the resonance voltage and the induced voltage, respectively (S1230).

The multimode transmitter can determine whether the sum of the resonance voltage and the induced voltage is less than the threshold voltage (S1240).

The reason why the sum of the resonance voltage and the induced voltage is judged to be less than the threshold voltage is that if the sum of the resonance voltage and the induced voltage is greater than the threshold voltage, If the sum of the resonance voltage and the induction voltage is less than the threshold voltage, an excess voltage at the side of the load 270 is not generated. Therefore, the wireless power is simultaneously received through the resonance mode and the induction mode (Simultaneous charging mode) can increase the power transmission efficiency.

When the sum of the resonance voltage and the induced voltage is less than the threshold voltage (Yes in S1240), the multimode receiver can change the second switch 250 to the short state for the simultaneous charge mode. This allows the multimode receiver to operate in a simultaneous charging mode where the power received by each of the resonant receiver 210 and the inductive receiver 220 is transferred to the load 270.

If the sum of the resonance voltage and the induced voltage is equal to or higher than the threshold voltage (No in S1240), the multimode receiver can determine whether the maximum voltage (larger voltage) of the resonance voltage and the induced voltage is less than the threshold voltage (S1260).

When the maximum voltage of the resonance voltage and the induction voltage is less than the threshold voltage (Yes in S1260), it is expected that the overvoltage will not occur even if the charging is performed by either the resonance mode or the induction mode. Charging may be performed in a corresponding mode (S1270).

For example, when the resonance voltage is the maximum voltage, the multimode receiver can keep the first switch 240 in the short state and the second switch 250 in the open state to perform charging in the resonance mode. Also, when the induced voltage is the maximum voltage, the multimode receiver can change the first switch 240 to the open state and the second switch 250 to the short state to perform charging in the inductive mode.

The multimode receiver may transmit a feedback signal to reduce the transmission power of the transmitter corresponding to the minimum voltage to the multimode transmitter while charging the multimode receiver in a mode corresponding to the maximum voltage in operation S1275. The feedback signal means a signal requesting to decrease the intensity of the transmission power of the multi-mode transmitter.

To control the resonant transmitter of the multimode transmitter, the multimode receiver may transmit a feedback signal (e.g., a dynamic parameter) through the resonant receiver 210. [

To control the inductive transmitter of the multimode transmitter, the multimode receiver may transmit a feedback signal (e.g., a control error packet) through the inductive receiver 220.

The transmission power of the transmitter corresponding to the minimum voltage is reduced by performing step S1275, and the minimum voltage is also decreased correspondingly. If the steps S1230, S1240, S1260, S1270, and S1275 are repeated, the sum of the resonance voltage and the induced voltage may become smaller than the threshold voltage at any point in time. That is, as the minimum voltage continues to decrease, the multimode receiver can operate in the simultaneous charging mode.

If the maximum voltage of the resonance voltage and the induction voltage is equal to or higher than the threshold voltage (No in S1260), it is expected that the overvoltage will occur when the charging is performed by the mode corresponding to the maximum voltage. Charging may be performed (S1280).

The multimode receiver may transmit a feedback signal to reduce the transmit power of the transmitter corresponding to the maximum voltage to the multimode transmitter while charging the multimode receiver in a mode corresponding to the minimum voltage (S1285). The feedback signal means a signal requesting to decrease the intensity of the transmission power of the multi-mode transmitter.

To control the resonant transmitter of the multimode transmitter, the multimode receiver may transmit a feedback signal (e.g., a dynamic parameter) through the resonant receiver 210. [

To control the inductive transmitter of the multimode transmitter, the multimode receiver may transmit a feedback signal (e.g., a control error packet) through the inductive receiver 220.

The transmission power of the transmitter corresponding to the maximum voltage is reduced by performing step S1285, and the maximum voltage is also decreased correspondingly. If the steps S1230, S1240, S1260, S1280, and S1285 are repeated, the sum of the resonance voltage and the induced voltage may become smaller than the threshold voltage at any point in time. That is, as the maximum voltage continues to decrease, the multimode receiver can operate in the simultaneous charging mode.

According to another exemplary embodiment of the present invention, when the multimode receiver is changed from a resonance mode to a chargeable state during charging, it is detected that an optimal wireless power reception mode Can be selected to perform charging.

In addition, when the overvoltage is expected to occur, the charging operation is performed in one wireless power receiving mode while the output voltage of the receiver corresponding to the other wireless power receiving mode is decreased in conjunction with the multimode transmitter, thereby operating in the simultaneous charging mode And can exhibit the maximum power transmission efficiency.

13 is a block diagram illustrating a structure of a multimode receiver according to an embodiment of the present invention.

13, the multimode receiver 1300 includes a main control unit 1310, a resonance mode communication unit 1320, an inductive mode communication unit 1330, an event occurrence determination unit 1340, a resonance voltage measurement unit 1350, A voltage measurement unit 1360, a switch control unit 1370, and a final mode determination unit 1380. [ Each configuration of the multimode receiver 1300 shown in FIG. 13 may correspond to at least one of the configurations shown in FIGS.

The main control unit 1310 controls the overall operation of the multimode receiver 1300, and in particular, can manage the state of each mode. The main controller 1310 may refer to the main controller 230 shown in FIG. 2, but may include a first controller 360 of the resonant receiver 350 and a second controller 570 of the inductive receiver 500, ) May be implemented as a single module.

The resonance mode communication unit 1320 can transmit / receive various control signals through the resonance mode communication session established when the resonance mode is activated. Here, the resonant mode communication session may be, but is not limited to, an out-of-band communication channel. The control signal transmitted / received by the resonance mode communication unit 1320 is replaced with the description of Figs. 1 to 12 described above.

The induction mode communication unit 1330 can transmit and receive various control signals through an induction mode communication session established when the induction mode is activated. Here, the inductive mode communication session may be, but is not limited to, an in-band communication channel. The control signals transmitted and received by the induction mode communication unit 1330 are replaced with the description of Figs. 1 to 12 described above.

The event occurrence determination unit 1340 may determine whether an identification signal of another mode is received during power transmission to the specific mode. The detailed operation and function of the event occurrence determiner 1340 are replaced with the description of Figs. 10 to 12 described above.

The resonance voltage measuring unit 1350 may measure an output voltage of the resonance receiver 210, that is, a voltage between a node between the resonance receiver 210 and the first switch 240.

The induced voltage measuring unit 1360 may measure the output voltage of the inductive receiver 220, that is, the voltage of the node between the inductive receiver 220 and the second switch 250.

The final mode determination unit 1370 can determine the final mode by comparing the sum of the resonance voltage and the induced voltage or the maximum voltage with the threshold voltage in FIG. 11 or 12.

The main control unit 1310 can dynamically control the power reception as well as the resonance mode and the inductive mode according to the determined final mode. The detailed operation and function of the main control section 1310 are replaced with the description of Figs. 1 to 12 described above.

The switch control unit 1370 can control the power received by the electromagnetic resonance method or the power received by the electromagnetic induction method to be delivered to the load under the control of the main control unit 1310. [

In the present specification, the operation method of the multimode transmitter according to the embodiment of the present invention is explained by taking as an example that the principal parameters such as resonance voltage, induced voltage, maximum voltage, minimum voltage and threshold voltage are voltage, It is clear that current or power can be used as parameters.

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 (14)

A method of operating a multimode receiver capable of wirelessly receiving power simultaneously in a resonant mode and an inductive mode,
Determining whether an event related to a charging induction mode by the resonance mode occurs;
Receiving power by the induction mode when the event is generated;
Measuring a resonance voltage according to the power received by the resonance mode and an induced voltage according to the power received by the induction mode; And
And comparing the sum of the resonance voltage and the induced voltage with a threshold voltage that is a threshold voltage value that causes the voltage applied to the load to exceed the voltage to determine whether to simultaneously charge the resonance mode and the induction mode. Mode receiver. The method according to claim 1,
And controlling the first switch and the second switch such that the power received by the resonant mode and the induction mode are simultaneously delivered to the load when the sum of the resonant voltage and the induced voltage is less than the threshold voltage, Mode receiver. The method according to claim 1,
Determines whether the resonance mode or the induction mode is to be charged by comparing the resonance voltage and the maximum voltage of the induced voltage with the threshold voltage when the sum of the resonance voltage and the induced voltage is equal to or greater than the threshold voltage Further comprising the steps of: 3. The method of claim 2,
And controlling the first switch and the second switch such that power received by the mode corresponding to the maximum voltage is delivered to the load when the maximum voltage is less than the threshold voltage. 3. The method of claim 2,
Further comprising controlling the first switch and the second switch such that power received by the mode corresponding to the minimum voltage is delivered to the load when the maximum voltage is greater than or equal to the threshold voltage. The method according to claim 1,
Wherein the event is an identification signal according to the inductive mode is received by the multimodal receiver. A method of operating a multimode receiver capable of wirelessly receiving power simultaneously in a resonant mode and an inductive mode,
Determining whether an event related to a charging induction mode by the resonance mode occurs;
Receiving power by the induction mode when the event is generated;
Measuring a resonance voltage according to the power received by the resonance mode and an induced voltage according to the power received by the induction mode;
Comparing the sum of the resonance voltage and the induced voltage with a threshold voltage that is a threshold voltage value that causes a voltage applied to the load to become an excess voltage to determine whether to simultaneously charge the resonance mode and the induction mode; And
And requesting reduction of the transmission power for the other mode while charging in one of the resonance mode and the induction mode when simultaneous charging in the resonance mode and the induction mode is impossible, Lt; / RTI > 8. The method of claim 7,
And controlling the first switch and the second switch such that the power received by the resonant mode and the induction mode are simultaneously delivered to the load when the sum of the resonant voltage and the induced voltage is less than the threshold voltage, Mode receiver. 8. The method of claim 7,
Determines whether the resonance mode or the induction mode is to be charged by comparing the resonance voltage and the maximum voltage of the induced voltage with the threshold voltage when the sum of the resonance voltage and the induced voltage is equal to or greater than the threshold voltage Further comprising the steps of: 10. The method of claim 9,
And controlling the first switch and the second switch such that power received by the mode corresponding to the maximum voltage is delivered to the load when the maximum voltage is less than the threshold voltage. 11. The method of claim 10,
Wherein the step of requesting the reduction of the transmission power comprises:
And transmitting a feedback signal to reduce the transmit power of the transmitter corresponding to the minimum voltage of the resonance voltage and the induced voltage. 10. The method of claim 9,
Further comprising controlling the first switch and the second switch such that power received by the mode corresponding to the minimum voltage is delivered to the load when the maximum voltage is greater than or equal to the threshold voltage. 13. The method of claim 12,
Wherein the step of requesting the reduction of the transmission power comprises:
And transmitting a feedback signal to reduce the transmit power of the transmitter corresponding to the maximum voltage. 8. The method of claim 7,
Wherein the event is an identification signal according to the inductive mode is received by the multimodal receiver.

Images