WO2017034154A1

WO2017034154A1 - Wireless power transmission device and method for controlling same

Info

Publication number: WO2017034154A1
Application number: PCT/KR2016/007638
Authority: WO
Inventors: 임성현
Original assignee: 엘지이노텍(주)
Priority date: 2015-08-27
Filing date: 2016-07-14
Publication date: 2017-03-02
Also published as: KR20170024999A

Abstract

A wireless power transmission device is disclosed. The device comprises: a first sensor for detecting the position of a receiver on a charging pad; and a multiplexing unit for multiplexing power and supplying same to at least one wireless power transmitter corresponding to the position of the receiver, wherein the multiplexed power is power controlled on the basis of the power transmission efficiency of each of the at least one wireless power transmitter. Accordingly, enhancements in device efficiency and user convenience may be expected.

Description

Wireless power transmitter and control method

The present invention relates to a wireless charging technology, and more particularly, to a method for controlling a wireless power transmitter having a plurality of transmitters.

Recently, with the rapid development of information and communication technology, a ubiquitous society based on information and communication technology is being made.

In order for telecommunications devices to be connected anytime and anywhere, sensors incorporating computer chips with communication functions must be installed in all social facilities. Therefore, the problem of power supply of these devices and sensors is a new problem. In addition, as the number of mobile devices such as Bluetooth handsets and music players has rapidly increased, charging a battery requires users time and effort. In recent years, wireless power transmission technology has been attracting attention as a way to solve this problem.

Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as radio waves and lasers. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.

To date, energy transmission using wireless may be classified into electromagnetic induction, electromagnetic resonance, and RF transmission using short wavelength radio frequency.

The electromagnetic induction method uses a phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows through one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Electromagnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).

Electromagnetic resonant method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Electromagnetic resonant method is hardly affected by the electromagnetic wave problem has the advantage that it is safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.

Short-wavelength wireless power transmission schemes—simply, RF transmission schemes—utilize the fact that energy can be transmitted and received directly in the form of RadioWave. This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power. In other words, the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.

Wireless power transfer technology can be used in various industries, such as the mobile, IT, railroad and consumer electronics industries.

Recently, a device equipped with a plurality of wireless power transmitters has appeared, but there has been a demand for a wireless power transmitter having more user convenience.

The present invention has been devised to solve the above-mentioned limitations of the prior art, and an object of the present invention is to provide a wireless power transmission apparatus having a plurality of wireless power transmitters having excellent charging efficiency.

Another object of the present invention is to provide a wireless power transmission apparatus for searching for a wireless power transmitter having excellent charging efficiency.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to various embodiments of the present disclosure, an apparatus for transmitting power wirelessly may include a first sensor configured to detect a position of the receiver on a charging pad; A multiplexer for multiplexing and supplying power to at least one wireless power transmitter corresponding to the position of the receiver; And a power converter configured to control the multiplexed power based on power transmission efficiency for each of the at least one wireless power transmitter.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described in detail below by those skilled in the art. Can be derived and understood.

The effects on the method and apparatus according to the present invention are described as follows.

First, by providing a wireless power transmitter having a plurality of wireless power transmitter with excellent charging efficiency, user convenience and device efficiency can be improved.

Second, by providing a wireless power transmitter for searching for a wireless power transmitter with excellent charging efficiency, user convenience and device efficiency may be improved.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, 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 new embodiments.

1 to 4 are diagrams for schematically explaining the operating principle of electromagnetic induction and electromagnetic resonance.

5 is a system configuration diagram illustrating a wireless power transmission method of the electromagnetic resonance method according to an embodiment.

6 is a view for explaining the type and characteristics of the wireless power transmitter in the electromagnetic resonance method according to the embodiment.

7 is a view for explaining the type and characteristics of the wireless power receiver in the electromagnetic resonance method according to the embodiment.

8 is an equivalent circuit diagram of a wireless power transmission system in an electromagnetic resonance method according to an embodiment.

9 is a state transition diagram illustrating a state transition procedure of a wireless power transmitter in an electromagnetic resonance method according to an embodiment.

10 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment.

FIG. 11 is a diagram for describing an operating area of a wireless power receiver according to a rectifier output voltage in an electromagnetic resonance method according to an embodiment.

12 is a view for explaining a wireless charging system of the electromagnetic induction method according to an embodiment of the present invention.

13 is a state transition diagram of a wireless power transmitter supporting the electromagnetic induction scheme according to the embodiment.

14 is a diagram illustrating an example of a wireless power system including a plurality of transmitters and charging in a magnetic induction manner.

15 to 20 are views illustrating various forms of coils according to embodiments.

21 is a block diagram of a wireless power transmission apparatus including a plurality of wireless power transmitters to which the present invention is applied, according to an embodiment.

FIG. 22 is a block diagram illustrating the wireless power transmitter of FIG. 21.

23 (a) and 23 (b) are examples of pulse signals for searching for a wireless power transmitter having excellent charging efficiency.

24 is a diagram illustrating an example of a wireless power transmission apparatus for adjusting wireless power.

25 is a diagram illustrating an apparatus for transmitting wireless power according to another embodiment of the present invention.

An apparatus for transmitting power wirelessly according to an embodiment of the present invention includes a first sensor for detecting a position of the receiver on a charging pad, a multiplexer for multiplexing and supplying power to at least one wireless power transmitter corresponding to the position of the receiver; The multiplexed power may be controlled based on power transmission efficiency of at least one wireless power transmitter.

Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In the description of the embodiments, in the case of being described as being formed at "up (up) or down (down)", "before (front) or back (back)" of each component, "up (up) or down (Below) "and" before (before) or after (behind) "include both in which the two components are in direct contact with each other or one or more other components are formed disposed between the two components.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It should be understood that the elements may be "connected", "coupled" or "connected".

In the description of the embodiment, the apparatus for transmitting wireless power on the wireless power system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably.

In addition, as a representation of a device for receiving wireless power from a wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Or the like can be used in combination.

The wireless power transmitter according to the present invention may be configured in a pad form, a cradle form, an access point (AP) form, a small base station form, a stand form, a ceiling embed form, a wall mount form, a vehicle embed form, a vehicle mount form, and the like. The transmitter of may transmit power to a plurality of wireless power receiver at the same time.

To this end, the wireless power transmitter may provide at least one wireless power transmission scheme (eg, electromagnetic induction scheme, electromagnetic resonance scheme, etc.).

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

As another example, the wireless power transmission method may use an electromagnetic resonance method of transmitting power to a wireless power receiver located at a short distance by tuning a magnetic field generated by a transmission coil of the wireless power transmitter to a specific resonance frequency. . For example, the electromagnetic resonance method may include a wireless charging technology of a resonance method defined in A4WP (Alliance for Wireless Power) which is a wireless charging technology standard apparatus.

As another example, the wireless power transmission method may use an RF wireless power transmission method that transmits power to a wireless power receiver located at a far distance by putting low power energy on an RF signal.

As another example of the present invention, the wireless power transmitter according to the present invention may be designed to support at least two or more wireless power transmission methods of the electromagnetic induction method, the electromagnetic resonance method, and the RF wireless power transmission method.

In this case, the wireless power transmitter may be adaptively used for the wireless power receiver based on the type, state, power required of the wireless power receiver, as well as the wireless power transmission scheme supported by the wireless power transmitter and the wireless power receiver. Can be determined.

In addition, the wireless power receiver according to an embodiment of the present invention may be provided with at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Herein, the wireless power transmission method may include at least one of the electromagnetic induction method, the electromagnetic resonance method, and the RF wireless power transmission method.

The wireless power receiver according to the present invention includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, and an MP3 player. It may be mounted on a small electronic device such as an electric toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, and the like, but is not limited thereto. The wireless power receiver according to another embodiment of the present invention may be mounted in a vehicle, an unmanned aerial vehicle, an air drone, or the like.

1 to 4 are diagrams for schematically explaining the operating principle of electromagnetic induction and electromagnetic resonance according to the embodiment.

Referring to FIG. 1, the wireless power transmission system may include a power source 100, a wireless power transmitter 200, a wireless power receiver 300, and a load terminal 400.

The power source 100 may be included in the wireless power transmitter 200, but is not limited thereto.

The apparatus 200 for transmitting power wirelessly may include a transmission induction coil 210 and a transmission resonance coil 220.

The wireless power receiver 300 may include a reception resonance coil 310, a reception induction coil 320, and a rectifier 330.

Both ends of the power source 100 may be connected to both ends of the transmission induction coil 210.

The transmission resonant coil 220 may be disposed at a predetermined distance from the transmission induction coil 210.

The reception resonance coil 310 may be disposed at a predetermined distance from the reception induction coil 320.

Both ends of the receiving induction coil 320 may be connected to both ends of the rectifier 330, and the load terminal 400 may be connected to both ends of the rectifier 330. In an embodiment, the load stage 400 may be included in the wireless power receiver 300.

The power generated by the power source 100 is delivered to the wireless power transmitter 200, and the power delivered to the wireless power transmitter 200 resonates with the wireless power transmitter 200 by a resonance phenomenon. The resonance frequency values may be transmitted to the same wireless power receiver 300.

The above description is only an example, and the transmitting device and the receiving device may transmit power in an inductive or resonant manner by using one transmitting / receiving coil.

Hereinafter, the power transmission process will be described in more detail.

The power source 100 may generate AC power having a predetermined frequency and transmit the generated AC power to the wireless power transmitter 200.

The transmission induction coil 210 and the transmission resonant coil 220 may be inductively coupled. That is, the alternating current is generated by the alternating current power supplied from the power source 100, and the alternating current is also transmitted to the transmitting resonance coil 220 physically spaced by the electromagnetic induction by the alternating current. Can be derived. Alternatively, a power source may be connected directly to the transmission resonant coil to allow current to flow.

Thereafter, the power delivered to the transmission resonant coil 220 may be transmitted to the wireless power receiver 300 having the same resonance frequency by the resonance using the wireless power transmitter 200 and the frequency resonance scheme.

Power may be transferred by resonance between two impedance matched LC circuits. Such resonance power transmission enables power transmission with higher transmission efficiency over longer distances than power transmission by electromagnetic induction.

The reception resonance coil 310 may receive power transmitted from the transmission resonance coil 220 by using the frequency resonance method. An AC current may flow in the reception resonant coil 310 due to the received power, and the power delivered to the reception resonant coil 310 may be inductively coupled to the reception resonant coil 310 by electromagnetic induction. Can be delivered. Power delivered to the receiving induction coil 320 may be rectified through the rectifying unit 330 and transferred to the load stage 400.

In an embodiment, the transmission induction coil 210, the transmission resonance coil 220, the reception resonance coil 310, and the reception induction coil 320 may have any one of a spiral or a helical structure. However, the present invention is not limited thereto.

The transmit resonant coil 220 and the receive resonant coil 310 may be resonantly coupled to enable power transmission at a resonant frequency.

Due to the resonance coupling of the transmission resonance coil 220 and the reception resonance coil 310, the power transmission efficiency between the wireless power transmitter 200 and the wireless power receiver 300 may be greatly improved.

The above wireless power transmission system has described power transmission by the resonant frequency method.

In addition, in the exemplary embodiment, the wireless power transmitter 200 has one transmission induction coil 210 and one transmission resonance coil 220, but the present disclosure is not limited thereto, and the plurality of transmission induction coils 210 may be used. ) And a plurality of transmission resonant coils 220. Detailed examples will be described later.

Embodiments of the present invention can be applied to power transmission by the electromagnetic induction method in addition to the resonance frequency method.

That is, in the embodiment, when the wireless power transmission system performs power transmission based on electromagnetic induction, the reception includes the transmission resonant coil 220 and the wireless power receiver 300 included in the wireless power transmitter 200. The resonant coil 310 may be omitted.

Quality factor and coupling coefficient may have important meanings in wireless power transmission. That is, the power transmission efficiency may have a proportional relationship with each of the quality index and the coupling coefficient. Therefore, as the value of at least one of the quality index and the coupling coefficient increases, power transmission efficiency may be improved.

The quality factor may refer to an index of energy that may be accumulated in the vicinity of the wireless power transmitter 200 or the wireless power receiver 300.

The quality factor may vary depending on the operating frequency w, the shape, dimensions, materials, and the like of the coil. The quality index can be represented by the following equation.

[Equation 1]

Q = w * L / R

L is the inductance of the coil, and R is the resistance corresponding to the amount of power loss generated in the coil itself.

The quality factor may have an infinite value from 0, and as the quality index increases, power transmission efficiency between the wireless power transmitter 200 and the wireless power receiver 300 may be improved.

Coupling Coefficient refers to the degree of magnetic coupling between the transmitting coil and the receiving coil and has a range of 0 to 1.

Coupling coefficient may vary according to the relative position or distance between the transmitting coil and the receiving coil.

2 is an equivalent circuit diagram of a transmission induction coil.

As shown in FIG. 2, the transmission induction coil 210 may be composed of an inductor L1 and a capacitor C1, and may be configured as a circuit having appropriate inductance and capacitance values.

The transmission induction coil 210 may be configured as an equivalent circuit having both ends of the inductor L1 connected to both ends of the capacitor C1. That is, the transmission induction coil 210 may be configured as an equivalent circuit in which the inductor L1 and the capacitor C1 are connected in parallel.

The capacitor C1 may be a variable capacitor, and impedance matching may be performed as the capacitance of the capacitor C1 is adjusted. Equivalent circuits of the transmit resonant coil 220, the receive resonant coil 310, and the receive induction coil 320 may also be the same as or similar to those shown in FIG. 2, but are not limited thereto.

3 is an equivalent circuit diagram of a power source and a wireless power transmission apparatus according to an embodiment.

As shown in FIG. 3, the transmission induction coil 210 and the transmission resonant coil 220 may be formed of inductors L1 and L2 and capacitors C1 and C2 having inductance values and capacitance values, respectively.

4 is an equivalent circuit diagram of a wireless power receiver according to an embodiment.

As shown in FIG. 4, the reception resonance coil 310 and the reception induction coil 320 may be formed of inductors L3 and L4 and capacitors C3 and C4 having inductance values and capacitance values, respectively.

The rectifier 330 may convert the DC power received from the reception induction coil 320 to DC power to transfer the converted DC power to the load terminal 400.

Specifically, although not shown, the rectifier 330 may include a rectifier and a smoothing circuit. In an embodiment, the rectifier may be a silicon rectifier and may be equivalent to the diode D1 as shown in FIG. 4, but is not limited thereto.

The rectifier may convert AC power received from the reception induction coil 320 to DC power.

The smoothing circuit may output the smooth DC power by removing the AC component included in the DC power converted by the rectifier. In the exemplary embodiment, as shown in FIG. 4, the rectifying capacitor C5 may be used, but is not limited thereto.

The DC power transmitted from the rectifier 330 may be a DC voltage or a DC current, but is not limited thereto.

The load stage 400 can be any rechargeable battery or device that requires direct current power. For example, the load stage 400 may mean a battery.

The wireless power receiver 300 may be mounted on an electronic device that requires power, such as a mobile phone, a notebook, a mouse, and the like. Accordingly, the reception resonance coil 310 and the reception induction coil 320 may have a shape that matches the shape of the electronic device.

The wireless power transmitter 200 may exchange information with the wireless power receiver 300 using in band or out of band communication.

In band communication may refer to a communication of exchanging information between the wireless power transmitter 200 and the wireless power receiver 300 using a signal having a frequency used for wireless power transmission. To this end, the wireless power receiver 300 may further include a switch, and may or may not receive power transmitted from the wireless power transmitter 200 through a switching operation of the switch. Accordingly, the wireless power transmitter 200 may detect an on or off signal of a switch included in the wireless power receiver 300 by detecting the amount of power consumed by the wireless power transmitter 200.

In detail, the wireless power receiver 300 may change the amount of power consumed by the wireless power transmitter 200 by changing the amount of power absorbed by the resistor using a resistor and a switch. The apparatus 200 for transmitting power wirelessly may acquire state information of the load terminal 400 by detecting a change in power consumed. The switch and the resistive element can be connected in series. In an embodiment, the state information of the load stage 400 may include information about the current charge amount and the charge amount trend of the load stage 400. The load stage 400 may be included in the wireless power receiver 300.

More specifically, when the switch is opened, the power absorbed by the resistive element becomes zero, and the power consumed by the wireless power transmitter 200 also decreases.

When the switch is short-circuited, the power absorbed by the resistor element is greater than zero, and the power consumed by the wireless power transmitter 200 increases. When the wireless power receiver repeats such an operation, the wireless power transmitter 200 may detect power consumed by the wireless power transmitter 200 and perform digital communication with the wireless power receiver 300.

The apparatus 200 for transmitting power wirelessly may receive state information of the load terminal 400 according to the above operation and may transmit power appropriate thereto.

On the contrary, the wireless power transmitter 200 may include a resistor and a switch on the side of the wireless power transmitter 200 to transmit the state information of the wireless power transmitter 200 to the wireless power receiver 300. In the embodiment, the state information of the wireless power transmitter 200 may include the maximum amount of power that the wireless power transmitter 200 may transmit, and the wireless power receiver 300 that the wireless power transmitter 200 provides power. The number and the amount of available power of the wireless power transmission apparatus 200 may be included.

Next, out-of-band communication will be described.

Out-of-band communication refers to a communication for exchanging information for power transmission by using a separate frequency band instead of a resonant frequency band. Each of the wireless power transmitter 200 and the wireless power receiver 300 may be equipped with an out-of-band communication module so that information necessary for power transmission may be exchanged between the wireless power transmitter 200 and the wireless power receiver 300. The out of band communication module may be mounted to the power source 100, but is not limited thereto. In an embodiment, the out-of-band communication module may use a short range communication method such as Bluetooth, Zigbee, WLAN, or Near Field Communication (NFC), but is not limited thereto.

As described above, the wireless transmission system is briefly illustrated and described. Hereinafter, the wireless transmission system will be described in more detail.

Referring to FIG. 5, the wireless power transmission system may include a wireless power transmitter 500 and a wireless power receiver 600.

In the present specification, as illustrated in FIG. 5, the wireless power transmitter 500 transmits wireless power to one wireless power receiver 600, but the wireless power transmitter 500 wirelessly transmits to a plurality of wireless power receivers 600. The power may be transmitted, and the wireless power receiver 600 may be implemented to be capable of receiving wireless power simultaneously from the plurality of wireless power transmitters 500.

The wireless power transmitter 500 may transmit power to the wireless power receiver 600 by generating a magnetic field using a specific power transmission frequency, for example, a resonance frequency.

The wireless power receiver 600 may receive power by tuning to the same frequency as the power transmission frequency used by the wireless power transmitter 500. For example, the frequency used for power transmission may be a 6.78MHz band, but is not limited thereto. Power transmitted by the wireless power transmitter 500 may be transferred to the wireless power receiver 600 which is in resonance with the wireless power transmitter 500.

The maximum number of wireless power receivers 600 that can receive power from one wireless power transmitter 500 includes the maximum transmit power level of the wireless power transmitter 500, the maximum power reception level of the wireless power receiver 600, the wireless It may be determined based on the physical structures of the power transmitter 500 and the wireless power receiver 600.

The wireless power transmitter 500 and the wireless power receiver 600 may perform bidirectional communication in a frequency band different from a frequency band (for example, a resonance frequency band) for wireless power transmission. Here, the bidirectional communication may use a half-duplex Bluetooth Low Energy (BLE) communication protocol, but is not limited thereto.

The wireless power transmitter 500 and the wireless power receiver 600 may exchange characteristic and state information (eg, power negotiation information for power control) with each other through the bidirectional communication.

Specifically, the wireless power receiver 600 may transmit predetermined power reception state information for controlling the power level received from the wireless power transmitter 500 to the wireless power transmitter 500 through bidirectional communication. 500 may dynamically control the transmit power level based on the received power reception state information. Through this, the wireless power transmitter 500 may not only optimize power transmission efficiency, but also prevent load damage due to over-voltage, and prevent unnecessary waste of power due to under-voltage. It can provide a function to.

In addition, the wireless power transmitter 500 performs a function of authenticating and identifying the wireless power receiver 600 through two-way communication, identifying an incompatible device or an unchargeable object, and identifying a valid load. You may.

Hereinafter, the wireless power transmission process of the resonance method will be described in detail with reference to FIG. 5.

The wireless power transmitter 500 includes a power supplier 510, a power conversion unit 520, a matching circuit 530, a transmission resonator 540, and a main controller. , 550, and a communication unit 560. The communication unit may include a data transmitter and a data receiver.

The power supply unit 510 may supply a specific supply voltage to the power converter 520 under the control of the main controller 550. In this case, the supply voltage may be a DC voltage or an AC voltage, but is not limited thereto.

The power converter 520 may convert the voltage received from the power supply 510 into a specific voltage under the control of the main controller 550. To this end, the power converter 520 may include at least one of a DC / DC converter, an AC / DC converter, and a power amplifier.

The matching circuit 530 is a circuit that matches the impedance between the power converter 520 and the transmission resonator 540 to maximize power transmission efficiency.

The transmission resonator 540 may wirelessly transmit power using a specific resonance frequency according to the voltage applied from the matching circuit 530.

The wireless power receiver 600 includes a reception resonator 610, a rectifier 620, a DC-DC converter 630, a load 640, a main controller 650. ) And a communication unit 660. The communication unit may include a data transmitter and a data receiver.

The reception resonator 610 may receive power transmitted by the transmission resonator 540 through a resonance phenomenon.

The rectifier 620 may convert an AC voltage applied from the receiver resonator 610 into a DC voltage.

The DC-DC converter 630 may convert the rectified DC voltage into a specific DC voltage required for the load 640.

The main controller 650 controls the operations of the rectifier 620 and the DC-DC converter 630 or generates characteristics and status information of the wireless power receiver 600 and controls the communication unit 660 to control the wireless power transmitter 500. The characteristics and state information of the wireless power receiver 600 may be transmitted to. For example, the main controller 650 may control the operation of the rectifier 620 and the DC-DC converter 630 by monitoring the intensity of the output voltage and the current in the rectifier 620 and the DC-DC converter 630. have.

The intensity information of the monitored output voltage and current may be transmitted to the wireless power transmitter 500 through the communication unit 660.

In addition, the main controller 650 compares the rectified DC voltage with a predetermined reference voltage to determine whether it is an over-voltage state or an under-voltage state, and a system error state is detected according to the determination result. If so, the detection result may be transmitted to the wireless power transmitter 500 through the communication unit 660.

In addition, when the main controller 650 detects a system error condition, the main controller 650 controls the operation of the rectifier 620 and the DC-DC converter 630 or blocks a predetermined overcurrent including a switch and / or a zener diode to prevent damage to the load. The circuit may be used to control the power applied to the load 640.

In FIG. 5, the

main controller

550 or 650 and the

communication unit

560 or 660 of each of the transceivers are shown as being configured with different modules, respectively, which is just one embodiment, and another embodiment of the present invention. It should be considered that the

main controller

550 or 650 and the

communication unit

560 or 660 may each be configured as a single module.

In the wireless power transmitter 500 according to an embodiment of the present invention, a new wireless power receiver is added to a charging area during charging, a connection with a wireless power receiver being charged is released, charging of the wireless power receiver is completed, and the like. If an event is detected, a power redistribution procedure for the remaining charged wireless power receivers may be performed. In this case, the power redistribution result may be transmitted to the wireless power receiver (s) connected through the out-of-band communication.

6 is a view for explaining the type and characteristics of the wireless power transmitter in the electromagnetic resonance method according to an embodiment.

The wireless power transmitter and the wireless power receiver may be classified into types and characteristics by class and category, respectively. The type and characteristics of the wireless power transmitter can be largely identified through the following three parameters.

First, the wireless power transmitter may be identified by a rating determined according to the strength of the maximum power applied to the transmission resonator 540.

Here, the rating of the wireless power transmitter is a predefined maximum input for each rating specified in the wireless power transmitter rating table (hereinafter, referred to as Table 1) below the maximum value of the power P _{TX_IN_COIL} applied to the transmission resonator 540. It may be determined by comparing with the power P _TX _{_IN_MAX} . Here, P _TX _{_IN_COIL} may be an average real value calculated by dividing a product of voltage V (t) and current I (t) applied to the transmission resonator 540 for a unit time by a corresponding unit time.

The ratings disclosed in Table 1 above are merely exemplary, and new ratings may be added or deleted. In addition, it should be considered that the values for the maximum input power for each class, the minimum category support requirement, and the maximum number of devices that can be supported may also be changed according to the purpose, shape, and implementation of the wireless power transmitter.

For example, with reference to the table 1, the maximum value of P _TX _{_IN_MAX} greater than or equal to a value corresponding to grade 3 of the power (P _{TX_IN_COIL)} to be applied to the transmission resonator (540), P _TX _{_IN_MAX} value corresponding to grade 4 If smaller, the class of the wireless power transmitter may be determined as class 3.

Second, the wireless power transmitter may be identified according to Minimum Category Support Requirements corresponding to the identified class.

The minimum category support requirement may be a supportable number of wireless power receivers corresponding to the highest level category among wireless power receiver categories that a wireless power transmitter of a corresponding class can support. That is, the minimum category support requirement may be the minimum number of maximum category devices that the wireless power transmitter can support.

In this case, the wireless power transmitter may support all categories of wireless power receivers corresponding to the maximum category or less according to the minimum category requirement.

However, if the wireless power transmitter can support a wireless power receiver of a category higher than the category specified in the minimum category support requirement, the wireless power transmitter may not be limited to supporting the wireless power receiver.

For example, referring to Table 1 above, a class 3 wireless power transmitter should support at least one category 5 wireless power receiver. Of course, in this case, the wireless power transmitter may support the wireless power receiver 100 corresponding to a category lower than the category level corresponding to the minimum category support requirement.

In addition, if it is determined that the wireless power transmitter can support a higher level category than the category corresponding to the minimum category support requirement, it should be considered that the wireless power transmitter may support the wireless power receiver having the higher level category.

Third, the wireless power transmitter may be identified by the maximum number of devices that can be supported corresponding to the identified class. Here, the maximum supportable device number may be identified by the maximum supportable number of wireless power receivers corresponding to the lowest level category among the categories supported in the corresponding class, hereinafter, simply the maximum number of devices that can be supported by a business card. .

For example, referring to Table 1 above, a class 3 wireless power transmitter should be able to support up to two wireless power receivers of at least category 3.

However, when the wireless power transmitter can support more than the maximum number of devices corresponding to its class, it is not limited to supporting more than the maximum number of devices.

The wireless power transmitter according to the present invention should perform wireless power transmission at least up to the number defined in Table 1 within the available power, unless there is a special reason for not allowing the power transmission request of the wireless power receiver.

For example, when there is no power available to accommodate the power transmission request, the wireless power transmitter may not accept the power transmission request of the wireless power receiver. Alternatively, power adjustment of the wireless power receiver may be controlled.

As another example, if the wireless power transmitter exceeds the number of acceptable wireless power receivers when the wireless power transmitter accepts the power transmission request, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

As another example, when the category of the wireless power receiver requesting power transmission exceeds the category level supported by its class, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

As another example, when the internal temperature exceeds a reference value, the wireless power transmitter may not accept the power transmission request of the corresponding wireless power receiver.

In particular, the wireless power transmitter according to the present invention may perform a power redistribution procedure based on the amount of power currently available. In this case, the power redistribution procedure may further perform the power redistribution procedure by considering at least one of a category, a wireless power reception state, a required power amount, a priority, and a power consumption amount to be described later of the power transmission target wireless power receiver.

Here, at least one information of the category, the wireless power reception state, the required power amount, the priority, and the power consumption of the wireless power receiver is transmitted from the wireless power receiver to the wireless power transmitter through at least one control signal through the out-of-band communication channel. Can be.

When the power redistribution procedure is completed, the wireless power transmitter may transmit the power redistribution result to the corresponding wireless power receiver through out-of-band communication.

The wireless power receiver may recalculate the estimated time to complete charging based on the received power redistribution result and transmit the recalculation result to the microprocessor of the connected electronic device. Subsequently, the microprocessor may control the display of the electronic device to display the estimated time required for recharging completion. In this case, the displayed charging completion time required may be controlled to disappear after being displayed on a predetermined time screen.

According to another embodiment of the present invention, when the estimated time to complete charging is recalculated, the microprocessor may control to display information on the recalculated reason. To this end, the wireless power transmitter may also transmit information on the reason for the power redistribution generated when the power redistribution result is transmitted to the wireless power receiver.

As shown in FIG. 7, the average output power P _RX _{_ OUT} of the receiving resonator 610 is a voltage V (t) and a current I (t) output by the receiving resonator 610 for a unit time. It may be a real value calculated by dividing the product by the corresponding unit time.

The category of the wireless power receiver may be defined based on the maximum output power P _RX _{_ OUT_MAX} of the receiving resonator 610, as shown in Table 2 below.

For example, when the charging efficiency at the load stage is 80% or more, the category 3 wireless power receiver may supply 5W of power to the charging port of the load.

The categories disclosed in Table 2 above are merely exemplary, and new categories may be added or deleted. In addition, it should be noted that the maximum output power for each category and application examples shown in Table 2 may also be changed depending on the purpose, shape, and implementation of the wireless power receiver.

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

In detail, FIG. 8 shows the interface point on an equivalent circuit in which reference parameters, which will be described later, are measured.

Hereinafter, the meanings of the reference parameters shown in FIG. 8 will be briefly described.

I _TX and I _TX _{_COIL} are root mean square (RMS) currents applied to the matching circuit (or matching network) 720 of the wireless power transmitter and RMS currents applied to the transmission resonator coil 725 of the wireless power transmitter, respectively. do.

Z _TX _{_IN} refers to an input impedance after the power supply / amplifier / filter 710 of the wireless power transmitter and an input impedance before the matching circuit 720.

Z _TX _{_IN_COIL} means the input impedance after the matching circuit 720 and before the transmission resonator coil 725.

L1 and L2 mean an inductance value of the transmission resonator coil 725 and an inductance value of the reception resonator coil 727, respectively.

Z _RX _{_ IN} denotes an input impedance at the rear end of the matching circuit 730 of the wireless power receiver and the front end of the filter / rectifier / load 740 of the wireless power receiver.

The resonance frequency used for the operation of the wireless power transmission system according to an embodiment of the present invention may be 6.78 MHz ± 15 kHz, but is not limited thereto.

The wireless power transfer system may provide simultaneous charging (multiple charging) for a plurality of wireless power receivers, in which case the amount of change in the received power of the remaining wireless power receivers may exceed the predetermined threshold even if a new wireless power receiver is added or deleted. Can be controlled so as not to exceed. For example, the amount of change in the received power may be ± 10%, but is not limited thereto. If it is impossible to control the received power change amount not to exceed the reference value, the wireless power transmitter may not accept the power transmission request from the newly added wireless power receiver.

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

When the matching circuit 730 of the wireless power receiver is connected to the rectifier, the real part of the Z _TX _{_IN} may be inversely related to the load resistance of the rectifier, hereinafter referred to as R _RECT . That is, increasing R _RECT may decrease Z _TX _{_IN,} and decreasing R _RECT may increase Z _TX _{_IN} .

Resonator Coupling Efficiency according to the present invention may be the maximum power reception ratio calculated by dividing the power transmitted from the receiver resonator coil to the load 740 by the power carried in the resonant frequency band by the transmitter resonator coil 725. have. Resonator matching efficiency between the wireless power transmitter and wireless power receiver can be calculated if the reference port impedance (Z _{TX_IN)} and receiving a reference port impedance (Z _{_IN} _RX) of the cavity resonator is a transmission that is perfectly matched.

The following table shows three examples of the minimum resonator matching efficiency according to the class of the wireless power transmitter and the class of the wireless power receiver according to the embodiment of the present invention.

If a plurality of wireless power receivers are used, the minimum resonator matching efficiency corresponding to the class and category shown in Table 3 may increase.

Referring to FIG. 9, a state of the wireless power transmitter is largely configured as a configuration state 810, a power save state 820, a low power state 830, and a power transfer state. , 840), a local fault state 850, and a locking fault state 860.

When power is applied to the wireless power transmitter, the wireless power transmitter may transition to configuration state 810. The wireless power transmitter may transition to the power saving state 820 when the predetermined reset timer expires or the initialization procedure is completed in the configuration state 810.

In the power saving state 820, the wireless power transmitter may generate a beacon sequence and transmit it through the resonant frequency band.

Here, the wireless power transmitter may control the beacon sequence to be started within a predetermined time after entering the power saving state 820. For example, the wireless power transmitter may control the beacon sequence to be started within 50 ms after the power saving state 820 transition, but is not limited thereto.

In the power saving state 820, the wireless power transmitter may periodically generate and transmit a first beacon sequence for detecting the wireless power receiver, and detect a load variation of a reception resonator. . Hereinafter, for convenience of description, the first beacon and the first beacon sequence will be referred to as short beacon and short beacon sequences, respectively.

In particular, the short beacon sequence may be repeatedly generated and transmitted at a predetermined time interval tCYCLE for a short period (tSHORT_BEACON) to save standby power of the wireless power transmitter until the wireless power receiver is detected. As an example, tSHORT_BEACON may be set to 30 ms or less and tCYCLE to 250 ms ± 5 ms, respectively. In addition, the current strength of the short beacon is more than a predetermined reference value, and may increase gradually over a period of time. As an example, the minimum current strength of the short beacon may be set sufficiently large so that the wireless power receiver of category 2 or higher of Table 2 may be detected.

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

In addition, in the power saving state 820, the wireless power transmitter may periodically generate and transmit a second beacon sequence for supplying sufficient power for booting and responding to the wireless power receiver. Hereinafter, for convenience of description, the second beacon and the second beacon sequence will be referred to as long beacon and long beacon sequences, respectively.

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

In particular, the Long Beacon sequence may be generated and transmitted at a predetermined time interval (t _LONG _{_BEACON_PERIOD} ) during a relatively long period (t _{LONG_BEACON} ) compared to the Short Beacon to supply sufficient power for booting 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 strength of the long beacon may be relatively strong compared to the current strength of the short beacon. In addition, the long beacon may maintain a constant power during the transmission interval.

Thereafter, after the wireless power transmitter detects a change in the impedance of the reception resonator, the wireless power transmitter may wait to receive a predetermined response signal during the long beacon transmission period. Hereinafter, for convenience of description, the response signal will be referred to as an advertisement signal. Here, the wireless power receiver may broadcast the advertisement signal through an out-of-band communication frequency band different from the resonant frequency band.

For example, the advertisement signal may include message identification information for identifying a message defined in the corresponding out-of-band communication standard, unique service for identifying whether the wireless power receiver is a legitimate or compatible receiver for the wireless power transmitter, or wireless power receiver identification. Information, output power information of the wireless power receiver, rated voltage / current information applied to the load, antenna gain information of the wireless power receiver, information for identifying the category of the wireless power receiver, wireless power receiver authentication information, with overvoltage protection Information on whether or not, may include at least one or any one of the software version information mounted on the wireless power receiver.

When the advertisement signal is received, the wireless power transmitter may transition from the power saving state 820 to the low power state 830 and then establish an out-of-band communication link with the wireless power receiver. Subsequently, the wireless power transmitter may perform a registration procedure for the wireless power receiver via the established out-of-band communication link. For example, when the out-of-band communication is Bluetooth low power communication, the wireless power transmitter may perform Bluetooth pairing with the wireless power receiver and exchange at least one of state information, characteristic information, and control information with each other through the paired Bluetooth link. have.

When the wireless power transmitter transmits a predetermined control signal to the wireless power receiver for initiating charging through out-of-band communication in the low power state 830, that is, the predetermined control signal requesting that the wireless power receiver delivers power to the load. The state of the wireless power transmitter may transition from the low power state 830 to the power transfer state 840.

If the out-of-band communication link establishment procedure or registration procedure in the low power state 830 is not normally completed, the state of the wireless power transmitter may transition to the power saving state 820 in the low power state 830.

The wireless power transmitter may be driven by a separate Link Expiration Timer for connection with each wireless power receiver, and the wireless power receiver may indicate that the wireless power transmitter is present in the wireless power transmitter at a predetermined time period. Must be sent before the link expiration timer expires. The link expiration timer is reset each time the message is received and an out-of-band communication link established between the wireless power receiver and the wireless power receiver may be maintained if the link expiration timer has not expired.

If, in the low power state 830 or the power transfer state 840, all 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, the state of the wireless power transmitter May transition to a power saving state 820.

In addition, the wireless power transmitter in the low power state 830 may drive a predetermined registration timer when a valid advertisement signal is received from the wireless power receiver. In this case, when the registration timer expires, the wireless power transmitter of the low power state 830 may transition to the power saving state 820. In this case, the wireless power transmitter may output a predetermined notification signal indicating that registration has failed through notification display means (for example, an LED lamp, a display screen, a beeper, etc.) provided in the wireless power transmitter.

In addition, in the power transfer state 840, the wireless power transmitter may transition to the low power state 830 when charging of all connected wireless power receivers is completed.

In particular, the wireless power receiver may allow registration of a new wireless power receiver in states other than configuration state 810, local failure state 850, and lock failure state 860.

In addition, the wireless power transmitter may dynamically control the transmission power based on state information received from the wireless power receiver in the power transmission state 840.

At this time, the receiver state information transmitted from the wireless power receiver to the wireless power transmitter is for reporting the required power information, voltage and / or current information measured at the rear of the rectifier, charging state information, overcurrent and / or overvoltage and / or overheating state. It may include at least one of information indicating whether the means for interrupting or reducing the power delivered to the load according to the information, overcurrent or overvoltage is activated. In this case, the receiver state information may be transmitted at a predetermined cycle or whenever a specific event occurs. In addition, a means for cutting off or reducing power delivered to the load according to the overcurrent or overvoltage may be provided using at least one of an ON / OFF switch and a Zener diode.

Receiver state information transmitted from the wireless power receiver to the wireless power transmitter according to another embodiment of the present invention is information indicating that the external power is connected to the wireless power receiver by wire, information indicating that the out-of-band communication method has been changed (for example, NFC (Near Field Communication) to at least one of (BLE) (Bluetooth Low Energy (BLE) communication) may be further included.

According to another embodiment of the present invention, a wireless power transmitter may receive power for each wireless power receiver based on at least one of its currently available power, priority for each wireless power receiver, and the number of connected wireless power receivers. May be adaptively determined. Here, the power strength for each wireless power receiver may be determined by the ratio of power to the maximum power that can be processed by the rectifier of the wireless power receiver.

Thereafter, the wireless power transmitter may transmit a predetermined power control command including information about the determined power strength to the corresponding wireless power receiver. In this case, the wireless power receiver may determine whether power control is possible using the power strength determined by the wireless power transmitter, and transmit the determination result to the wireless power transmitter through a predetermined power control response message.

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

The power transmission state 840 may be any one of a first state 841, a second state 842, and a third state 843 according to a power reception state of a connected wireless power receiver.

For example, the first state 841 may mean that power reception states of all wireless power receivers connected to the wireless power transmitter are normal voltages.

The second state 842 may mean that there is no wireless power receiver in which the power reception state of the at least one wireless power receiver connected to the wireless power transmitter is a low voltage state and a high voltage state.

The third state 843 may mean that a power reception state of at least one wireless power receiver connected to the wireless power transmitter is a high voltage state.

The wireless power transmitter may transition to the lock failure state 860 when a system error is detected in the power saving state 820, the low power state 830, or the power transfer state 840.

The wireless power transmitter in the lock failure state 860 may transition to the configuration state 810 or the power saving state 820 when it is determined that all connected wireless power receivers have been removed from the charging area.

In addition, in lock failure state 860, the wireless power transmitter may transition to local failure state 850 if a local failure is detected. Herein, when the local failure is released, the wireless power transmitter having the local failure state 850 may transition back to the lock failure state 860.

On the other hand, when the transition to the local failure state 850 in any one of the configuration state 810, power saving state 820, low power state 830, power transmission state 840, the wireless power transmitter has a local failure Once released, transition to configuration state 810 may occur.

When the wireless power transmitter transitions to the local failure state 850, the wireless power transmitter may cut off the power supplied to the wireless power transmitter. For example, the wireless power transmitter may transition to a local failure state 850 when a failure such as an overvoltage, an overcurrent, an overheat, or the like is detected, but is not limited thereto.

For example, when an overcurrent, an overvoltage, an overheat, or the like is detected, the wireless power transmitter may transmit a predetermined power control command to at least one connected wireless power receiver to reduce the strength of the power received by the wireless power receiver.

As another example, when an overcurrent, an overvoltage, an overheat, or the like is detected, the wireless power transmitter may transmit a predetermined control command to the connected at least one wireless power receiver to stop charging of the wireless power receiver.

Through the above power control procedure, the wireless power transmitter can prevent device damage due to overvoltage, overcurrent, overheating, and the like.

The wireless power transmitter may transition to the lock failure state 860 when the intensity of the output current of the transmission resonator is greater than or equal to the reference value. At this time, the wireless power transmitter transitioned to the lock failure state 860 may attempt to make the intensity of the output current of the transmission resonator less than or equal to the reference value for a predetermined time. Here, the attempt may be repeated for a predetermined number of times. If the lock failure state 860 is not released despite the repetition, the wireless power transmitter transmits a predetermined notification signal indicating that the lock failure state 860 is not released to the user by using a predetermined notification means. can do. In this case, when all the wireless power receivers located in the charging area of the wireless power transmitter are removed from the charging area by the user, the lock failure state 860 may be released.

On the other hand, when the intensity of the output current of the transmission resonator falls below the reference value within a predetermined time or during the predetermined repetition, the lock failure state 860 is automatically released. In this case, the state of the wireless power transmitter may automatically transition from the lock failure state 860 to the power saving state 820 to perform the detection and identification procedure for the wireless power receiver again.

The wireless power transmitter of the power transmission state 840 transmits continuous power, and adaptively controls the output power based on the state information of the wireless power receiver and a predefined optimal voltage region setting parameter. have.

For example, the optimal voltage region setting parameter may include at least one of a parameter for identifying a low voltage region, a parameter for identifying an optimal voltage region, a parameter for identifying a high voltage region, and a parameter for identifying an overvoltage region. It may include.

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

In addition, the wireless power transmitter may control the transmission power to maximize the power transmission efficiency.

In addition, the wireless power transmitter may control the transmission power so that the deviation of the amount of power required by the wireless power receiver is equal to or less than the reference value.

In addition, the wireless power transmitter may stop power transmission when the rectifier output voltage of the wireless power receiver reaches a predetermined overvoltage region, that is, when an over voltage is detected.

Referring to FIG. 10, a state of a wireless power receiver may be classified into a disabled state 910, a boot state 920, an enable state 930 (or an on state), and a system error state. System Error State, 940) can be configured.

In this case, the state of the wireless power receiver may be determined based on the intensity of the output voltage at the rectifier terminal of the wireless power receiver, hereinafter, referred to as a V _RECT business card.

The activation state 930 may be divided into an optimum voltage state 931, a low voltage state 932, and a high voltage state 933 according to the value of V _RECT .

The wireless power receiver in the inactive state 910 may transition to the boot state 920 if the measured V _RECT value is greater than or equal to a predefined V _{RECT_BOOT} value.

In boot state 920, the wireless power receiver establishes an out-of-band communication link with the wireless power transmitter and V _RECT Wait until the value reaches the power required by the load stage.

Wireless power receiver in boot state 920 is V _RECT When it is confirmed that the value has reached the power required for the load stage, the transition to the active state 930 may begin charging.

The wireless power receiver in the activated state 930 may transition to the boot state 920 when charging is confirmed to be completed or stopped.

In addition, the wireless power receiver in the activated state 930 may transition to the system error state 940 when a predetermined system error is detected. Here, the system error may include overvoltage, overcurrent and overheating as well as other predefined system error conditions.

In addition, the wireless power receiver in the activated state 930 is V _RECT If the value falls below the V _RECT _{_BOOT} value, it may transition to an inactive state 910.

In addition, the wireless power receiver in the boot state 920 or the system error state 940 may transition to the inactive state 910 when the V _RECT value drops below the V _{RECT_BOOT} value.

Hereinafter, the state transition of the wireless power receiver in the activated state 930 will be described in detail with reference to FIG. 11 to be described later.

Referring to FIG. 11, when the V _RECT value is smaller than the predetermined V _RECT _{_} _BOOT , the wireless power receiver is maintained in an inactive state 910.

Thereafter, if the V _RECT value is increased above V _RECT _{_BOOT} , the wireless power receiver transitions to the boot state 920 and may broadcast the advertisement signal within a predetermined time. Thereafter, when the advertisement signal is detected by the wireless power transmitter, the wireless power transmitter may transmit a predetermined connection request signal for establishing an out-of-band communication link to the wireless power receiver.

If the out-of-band communication link is established normally and the registration is successful, the wireless power receiver will have until the V _RECT value reaches the minimum output voltage at the rectifier for normal charging, hereinafter referred to as V _{RECT_MIN} for convenience of explanation. I can wait.

If the V _RECT value exceeds V _RECT _{_ MIN} , the state of the wireless power receiver transitions from the boot state 920 to the activated state 930 and may begin charging the load.

If the V _RECT value in the activation state 930 exceeds V _RECT _{_ MAX} , which is a predetermined reference value for determining the overvoltage, the wireless power receiver may transition from the activation state 930 to the system error state 940.

Referring to FIG. 11, the activation state 930 is divided into a low voltage state (932), an optimal voltage state (931), and a high voltage state (933) according to the value of V _RECT . Can be.

The low voltage state 932 means a state where V _RECT _{_BOOT} <= V _RECT <= V _RECT _{_} _MIN , and the optimal voltage state 931 means a state where V _RECT _{_MIN} <V _RECT <= V _RECT _{_} _HIGH , The high voltage state 933 may mean a state in which V _{RECT_HIGH} <V _RECT <= V _{RECT_MAX} .

In particular, the wireless power receiver transitioned to the high voltage state 933 may suspend the operation of cutting off the power supplied to the load during the predetermined time period, which is referred to as the high voltage state holding time for convenience of description below. In this case, the high voltage state holding time may be determined in advance so that no damage occurs to the wireless power receiver and the load in the high voltage state 933.

When the wireless power receiver transitions to the system error state 940, the wireless power receiver may transmit a predetermined message indicating overvoltage occurrence to the wireless power transmitter through the out-of-band communication link within a predetermined time.

In addition, the wireless power receiver may control the voltage applied to the load by using the overvoltage blocking means provided to prevent damage of the load due to the overvoltage in the system error state 930. Here, an ON / OFF switch or a zener diode may be used as the overvoltage blocking means.

In the above embodiment, when an overvoltage occurs in the wireless power receiver and transitions to the system error state 940, the method and means for responding to the system error in the wireless power receiver are described. However, this is only one embodiment. Another embodiment may transition to a system error state by overheating, overcurrent, or the like in the wireless power receiver.

For example, when a transition to a system error state occurs due to overheating, the wireless power receiver may transmit a predetermined message indicating the occurrence of overheating to the wireless power transmitter. In this case, the wireless power receiver may reduce the heat generated internally by driving the provided cooling fan.

The wireless power receiver according to another embodiment of the present invention may receive wireless power in cooperation with a plurality of wireless power transmitters. In this case, the wireless power receiver may transition to the system error state 940 when it is determined that the wireless power transmitter determined to receive the actual wireless power is different from the wireless power transmitter to which the actual out-of-band communication link is established.

Referring to FIG. 12, the electromagnetic charging type wireless charging system includes a wireless power transmitter 500 and a wireless power receiver 600. When the electronic device including the wireless power receiver 600 is positioned on the wireless power transmitter 500, the coils of the wireless power transmitter 500 and the wireless power receiver 600 may be coupled to each other by an electromagnetic field.

The wireless power transmitter 500 may modulate the power signal and change the frequency to generate an electromagnetic field for power transmission. The wireless power receiver 600 receives power by demodulating electromagnetic signals according to a protocol set to be suitable for a wireless communication environment, and controls the power output strength of the wireless power transmitter 500 based on the received power. The feedback signal may be transmitted to the wireless power transmitter 500 through in-band communication. For example, the wireless power transmitter 500 may increase or decrease the transmission power by controlling an operating frequency according to a control signal for power control.

The amount (or increase / decrease) of the transmitted power may be controlled by using a feedback signal transmitted from the wireless power receiver 600 to the wireless power transmitter 500. In addition, communication between the wireless power receiver 600 and the wireless power transmitter 500 is not limited to in-band communication using the above-described feedback signal, but out of band having a separate communication module. It may also be achieved using -of-band communication. For example, a short range wireless communication module such as Bluetooth, Bluetooth Low Energy (BLE), NFC, or Zigbee may be used.

In the electromagnetic induction scheme, a frequency modulation scheme may be used as a protocol for exchanging state information and control signals between the wireless power transmitter 500 and the wireless power receiver 600. The device identification information, the charging state information, the power control signal, etc. may be exchanged through the protocol.

As illustrated in FIG. 12, the wireless power transmitter 500 according to an embodiment of the present invention may detect a feedback signal transmitted from the signal generator 1080 and the wireless power receiver 600 generating a power signal. Coil L1 and capacitors C1 and C2 located between the power supply terminals V_Bus and GND, and switches SW1 and SW2 whose operation is controlled by the signal generator 1080. The signal generator 1080 controls the demodulator 1024 for demodulating the feedback signal transmitted through the coil L1, the frequency driver 1026 for changing the frequency, the modulator 1024, and the frequency driver 1026. It may be configured to include a transmission control unit 1022 for. The feedback signal transmitted through the coil L1 is demodulated by the demodulator 1024 and then input to the transmission controller 1022. The transmission controller 1022 controls the frequency driver 1026 based on the demodulated signal. The frequency of the power signal transmitted to the coil L1 may be changed.

The wireless power receiver 600 includes a modulator 1052 for transmitting a feedback signal through the coil L2, a rectifier 1054 for converting an AC signal received through the coil L2 into a DC signal, And a reception controller 1060 for controlling the modulator 1052 and the rectifier 1054. The reception controller 1060 is configured to supply the output DC voltage of the power supply 1062 and the rectifier 1054 to supply power necessary for the operation of the rectifier 1054 and the other wireless power receiver 1050. Providing the wireless power transmitter 500 with the DC-DC converter 1064 for changing the DC voltage to meet the charging requirements, the load 1068 for outputting the converted power, and the received power state and the state of the charging target. It may include a feedback communication unit 1066 for generating a feedback signal for.

The operating state of the wireless charging system supporting the electromagnetic induction method may be classified into a standby state, a signal detection state, an identification confirmation state, a power transmission state, and a charging completion state. Conversion to different operation states may be performed according to a feedback communication result between the wireless power receiver 600 and the wireless power transmitter 500. The conversion between the standby state and the signal detection state may be made through a predetermined receiver detection method for detecting the presence of the wireless power receiver 600.

As shown in FIG. 13, the operation state of the wireless power transmitter is largely in a standby state (STANDBY, 1110), a signal detection state (PING, 1120), an identification confirmation state (IDENTIFICATION, 1130), and a power transfer state (POWER TRANSFER, 1140). ) And the charging completion state (END OF CHARGE, 1150).

Referring to FIG. 13, during the standby state 1110, the wireless power transmitter monitors the charging area to detect whether a chargeable receiving device is located. In order to detect a rechargeable receiver, a wireless power transmitter may use a method of monitoring a change in a magnetic field, capacitance, or inductance. When the rechargeable receiver is found, the wireless power transmitter may transition from the standby state 1110 to the signal detection state 1120 (S912).

In the signal detection state 1120, the wireless power transmitter may connect with a rechargeable receiver and determine whether the receiver is using a valid wireless charging technology. In addition, in the signal detection state 220, the wireless power transmitter may perform an operation for distinguishing other devices that generate a dark current (parasitic current).

In addition, in the signal detection state 1120, the wireless power transmitter may transmit a digital ping having a structure according to a preset frequency and time for connection with a rechargeable receiver. When a sufficient power signal is transmitted from the wireless power transmitter to the wireless power receiver, the wireless power receiver may respond by modulating the power signal according to a protocol set in the electromagnetic induction scheme. If a valid signal according to a wireless charging technology used by the wireless power transmitter is received, the wireless power transmitter may transition from the signal detection state 1120 to the identification confirmation state 1130 without blocking transmission of the power signal (S924). . In the case of the wireless power transmitter that does not support the operation of the identification check state 1130, the wireless power transmitter may transition to the power transmission state 1140 (S924 and S934).

If the charging completion signal is received from the wireless power receiver, the wireless power transmitter may transition from the signal detection state 1120 to the charging completion state 1150 (S926).

If no response from the wireless power receiver is detected in the signal detection state S1120-for example, the feedback signal is not received for a predetermined time-the wireless power transmitter blocks the transmission of the power signal. It may transition to the standby state 1110 (S922).

According to the wireless power transmitter, the identification confirmation state 1130 may be optionally included.

Unique receiver identification information for each wireless power receiver may be pre-allocated and maintained, and the wireless power receiver needs to inform the wireless power transmitter that the device can be charged according to a specific wireless charging technology when a digital ping is detected. In order to confirm the receiver identification information, the wireless power receiver may transmit its own identification information to the wireless power transmitter through feedback communication.

The wireless power transmitter supporting the identification check state 1130 may determine validity of receiver identification information sent from the wireless power receiver. If it is determined that the received receiver identification information is valid, the wireless power transmitter may transition to the power transmission state 1140 (S936). If the received receiver identification information is not valid or is not determined to be valid within a predetermined time, the wireless power transmitter may block transmission of the power signal and may transition to the standby state 1110 (S932).

In the power transmission state 1140, the wireless power transmitter may control the strength of the transmitted power based on the feedback signal received from the wireless power receiver. In addition, the wireless power transmitter in the power transmission state 1140 may determine that there is no violation of the acceptable operating range and acceptable limits that may occur, for example, due to detection of a new device.

If the predetermined charging completion signal is received from the wireless power receiver in the power transmission state 1140, the wireless power transmitter may stop the transmission of the power signal and transition to the charging completion state 1150 (S946). In addition, when the internal temperature exceeds the preset value during operation in the power transmission state 1140, the wireless power transmitter may block the transmission of the power signal and may transition to the charging completion state 1150 (S944).

In addition, when a system error or the like is detected in the power transmission state 1140, the wireless power transmitter may stop the transmission of the power signal and transition to the standby state 1110 (S942). The new charging procedure may be resumed when the receiving device to be charged is detected in the charging area of the wireless power transmitter.

As described above, the wireless power transmitter may transition to the charging completion state 1150 when the charging completion signal is input from the wireless power receiver or when the temperature exceeds the preset range during operation.

If the transition to the charging completion state 1150 is caused by the charging completion signal, the wireless power transmitter may block transmission of the power signal and wait for a predetermined time. Here, the predetermined time may vary according to a component such as a coil included in the wireless power transmitter, a range of the charging region, or an allowable limit of the charging operation in order to transmit the power signal by the electromagnetic induction method. After a certain period of time in the charging completion state 1150, the wireless power transmitter may transition to the signal detection state 220 to connect with the wireless power receiver located on the charging surface (S954). The wireless power transmitter may also monitor the charging surface to see if the wireless power receiver is removed for a period of time. If it is detected that the wireless power receiver has been removed from the charging surface, the wireless power transmitter may transition to the standby state 1110 (S952).

If the transition to the charging completion state S1150 is due to the internal temperature of the wireless power transmitter, the wireless power transmitter may block power transmission and monitor the internal temperature change. If the internal temperature drops to a predetermined range or value, the wireless power transmitter may transition to the signal detection state 1120 (S954). At this time, the temperature change range or value for changing the state of the wireless power transmitter may vary according to the manufacturing technology and method of the wireless power transmitter. While monitoring the temperature change, the wireless power transmitter can monitor the charging surface to see if the wireless power receiver is removed. If it is detected that the wireless power receiver has been removed from the charging surface, the wireless power transmitter may transition to the standby state 1110 (S952). FIG. 14 is provided with a plurality of transmitters and wirelessly charges in a magnetic induction manner. A diagram illustrating an example of a power system.

According to FIG. 14, the wireless power transmitter 500 may include a charging pad 290, and the charging pad 290 may include a plurality of power transmitters ((1,1) to (1,5)). The wireless power receiver 600 may be described as a terminal 600.

Here, the plurality of transmitters may include a coil and a power source, respectively, and one controller may be controlled through one controller.

Each of the plurality of power transmitters (1, 1) to (1, 5) may include a transmission coil 14-1 to 14-5 and a plurality of first magnets 12-1 to 12-5. . The plurality of transmission coils 14-1 to 14-5 and the plurality of first magnets 12-1 to 12-5 may be disposed adjacent to an upper surface of the charging pad 290. The transmitting coils 14-1 to 14-5 and the magnets 12-1 to 12-5 may be disposed on the same surface.

In yet another embodiment, each of the plurality of power transmitters (1,1) to (1,5) may include a transmission coil 14-1 to 14-5 or a transmission coil arrangement. The transmission coil arrangement is a unit for controlling a plurality of transmission coils in a bundle. Here the magnet is excluded from the component.

The transmission coils 14-1 to 14-5 may be transmission transmission coils and / or transmission resonance coils illustrated in FIG. 1. For example, in the case of the resonance method, both the transmission induction coil and the transmission resonant coil may be used, whereas in the case of the electromagnetic induction method, only the transmission induction coil may be used.

Each of the plurality of transmission coils 14-1 to 14-5 may be disposed to surround each of the plurality of first magnets 12-1 to 12-5. For example, the first transmission coil 14-1 may surround the first magnet 12-1, the second transmission coil 14-2 may surround the second magnet 12-2, The third transmission coil 14-3 may surround the third magnet 12-3, and the fourth transmission coil 14-4 may be configured to surround the fourth magnet 12-4, The fifth transmitting coil 14-5 may be configured to surround the fifth magnet 12-5. However, since this drawing is a sectional drawing, it is difficult to display it on a drawing.

The plurality of transmission coils may be in various forms and arranged in various forms. For example, a plurality of transmission coils may be arranged in a cell form so as to cover the charging pads without gaps.

Hereinafter, the shape of the coil will be described with reference to FIGS. 15 to 20.

According to FIG. 15, the transmitting coil may have a hole in the center (Hi to Wi part). In addition, the coil may be disposed to surround the central hole (Ho ~ Wo part). In addition, the coil may be arranged to surround the central hole (Hi to Wi part) in a stacked structure. Of course, the receiving coil can also be configured with FIG.

According to FIG. 16, the transmitting coil may be configured in a disk shape with holes. A plurality of coil arrays may be disposed in the disc portion, or stacked coils may be disposed.

According to FIG. 17, the transmitting coil may be configured of a plurality of coil arrays.

According to FIG. 18, the transmitting coil may be configured in a cell shape and configured in an arrangement form.

According to FIG. 19 and FIG. 20, the transmitting coil may be composed of stacked coils. In detail, the third coil c may be disposed at the bottom of the second coil b at the top of the first coil a. The first coil to the third coil may be arranged while being spaced apart from each other. This allows more power to be delivered to the receiving coil.

The transmission coils 14-1 to 14-5 have several numbers of turns, and may be spaced apart from adjacent transmission coils 14-1 to 14-5, but are not limited thereto. The transmitting coils 14-1 to 14-5 may be arranged to be parallel to the virtual horizontal plane. The central area of the transmitting coils 14-1 to 14-5 having such a structure may be an empty space.

Although it has been described that the plurality of power transmitters (1,1) to (1,5) are arranged in a line, this is only an example, and a plurality of power transmitters may be configured in a stacked structure.

The plurality of first magnets 12-1 to 12-5 may be disposed in the central region of the transmitting coils 14-1 to 14-5. The thickness of the plurality of first magnets 12-1 to 12-5 may be equal to or greater than or less than the thickness of the transmission coils 14-1 to 14-5. The plurality of first magnets 12-1 to 12-5 according to the intensity of magnetic flux density required for the plurality of first magnets 12-1 to 12-5 and the occupied area of the magnets 12-1 to 12-5. ) And the area of the plurality of first magnets 12-1 to 12-5 may vary.

The wireless power receiver 600 may include a shielding member, a receiving coil, and a second magnet. The receiving coil and the second magnet may be disposed on the same side.

The second magnet may be configured for aligning the coil using the second magnet when the wireless power transmitter includes the first magnet, and the wireless power transmitter detects that the wireless power receiver is approaching the charging pad. It may be a configuration for.

In another embodiment of the present invention may not include a second magnet. Without the magnet, the wireless power receiver may feed back the signal strength to the power received through the receiving coil to perform at least one operation such as alignment of the receiving coil, selection of an active transmitting coil, and detection of the wireless power receiver. In addition, the wireless power receiver may be detected by the wireless power transmitter due to a change in current generated when the wireless power receiver rises on the charging pad.

Although the wireless power receiver 600 is expressed as being in contact with the charging pad 510 of the wireless power transmitter 500, the wireless power receiver 600 may be spaced apart from the charging pad 510 at a predetermined distance. .

The wireless power receiver 600 may be larger or smaller in size than each of the plurality of power transmitters (1,1) to (1,5), but is not limited thereto.

The receiving coil may be the receiving resonance coil and / or the receiving induction coil shown in FIG. 1. For example, in the case of the resonance method, both the reception resonance coil and the reception induction coil are used, whereas in the case of the electromagnetic induction method, only the reception induction coil may be used.

The receiving coil may be arranged to surround the second magnet. The receiving coil has several turns and can be spaced between adjacent receiving coils. The receiving coil may be arranged to be parallel to the virtual horizontal plane. The central region of the receiving coil having such a structure may be an empty space.

The second magnet may be disposed in the central region of the receiving coil. The central region of the receiving coil may be smaller than the central region of the transmitting coils 14-1 to 14-5, but is not limited thereto. The thickness of the second magnet may be equal to or greater than or less than the thickness of the receiving coil. The thickness of the second magnet and the area of the second magnet may vary depending on the strength of the magnetic flux density required for the second magnet and the area occupied by the second magnet.

The second magnet allows the charging pad 290 to detect whether the wireless power receiver 600 is close to or touched.

For this sensing, the charging pad 290 may further include a Hall sensor 16-1 to 16-5. The hall sensors 16-1 to 16-5 may be disposed between the top surface of the charging pad 290 and the first magnets 12-1 to 12-5, but are not limited thereto. The hall sensors 16-1 to 16-5 may be disposed closer to the top surface of the charging pad 290 than the first magnets 12-1 to 12-5. The hall sensors 16-1 to 16-5 are connected to the charging pad 290 between the first magnets 12-1 to 12-5 of the charging pad 290 and the second magnet of the wireless power receiver 300. Can be deployed.

The hall sensors 16-1 to 16-5 detect only the intensity of the magnetic flux density of the first magnets 12-1 to 12-5 when the wireless power receiver 600 is not present. However, when the wireless power receiver 300 comes close to the charging pad 290, the Hall sensors 16-1 to 16-5 have strengths of magnetic flux densities of the first magnets 12-1 to 12-5. In addition, the intensity of the magnetic flux density of the second magnet can be detected.

Therefore, the charging pad 290 is charged by the wireless power receiver 600 based on the intensity of the magnetic flux density of the first magnets 12-1 to 12-5 detected when the wireless power receiver 600 is not present. The intensity of the magnetic flux density of the first magnets 12-1 to 12-5 and the intensity of the magnetic flux density of the second magnet which are detected when placed on 290 are detected, and the variation width α of the magnetic flux density is a threshold value. In this case, it is determined that the wireless power receiver 600 is placed on the charging pad 290 for charging, and the wireless power receiver 3600 may be charged.

Alternatively, the wireless power transmitter 500 may recognize and charge the wireless power receiver 600 even through a change value of the impedance.

In the above example, the Hall sensors 16-1 to 16-5 are described as being disposed between the top surface of the charging pad 290 and the first magnets 12-1 to 12-5, but this is one embodiment. In another embodiment of the present invention, the Hall sensors 16-1 to 16-5 are disposed on one side of the lower ends of the first magnets 12-1 to 12-5, or the transmitting coils 14-1 to. It should be noted that it may be disposed on the lower side of 14-5).

To this end, the second magnet may be made of a material causing a change width? Of the magnetic flux density above a threshold value. For example, the threshold may be 32G. The threshold required by the standard may be 40G.

The second magnet may be an electrical sheet (electronic sheet). For example, the electrical steel sheet may contain at least 1% to 5% of silicon (Si), but is not limited thereto. The silicon content of the second magnet may vary so as to cause a change in the magnetic flux density α above the threshold required by the standard or the customer.

For example, the receiving coil and the second magnet may be attached to the rear surface of the shielding member by using an adhesive. A printed circuit board on which electronic components including a power source, an AC power generator, and a controller are mounted may be disposed on the shield member.

The shielding member may shield the magnetic field induced by the coil so that the magnetic field does not affect the electronic component, thereby preventing malfunction of the electronic component.

The wireless transmitter 200 calculates the occupancy of the area of the receiver 600 using the hall sensors 16-1 to 16-5 and uses the plurality of power transmitters ((1, 1) to (1, 5). You can distribute the power differentially to)).

According to FIG. 21, the wireless power transmitter 500 may include a power source 1410, a multiplexer 1420, a power converter 1430, a first sensor 1440, and a plurality of transmitters 1450-1 to 1450-n. ) May be included.

The power generated by the power source 1410 may be delivered to the wireless power transmitter 500, and may generate and transmit AC power having a predetermined frequency to the wireless power transmitter 500.

The first sensor 1440 may be disposed on the charging pad 290 to detect the wireless power receiver 600. The first sensor 1440 may be a physical sensor (eg, a position sensing sensor) to determine the location of the wireless power receiver 600, and measure a current amount, a magnetic flux density change, etc. of the wireless power receiver 600. It may be a sensor for detecting the position. In addition, the first sensor 1440 may detect the position of the wireless power receiver 600 by detecting a change in the impedance of the wireless power transmitter 500.

In addition, the first sensor 1440 may receive location information through the in-band communication (or out-of-band communication) with the wireless power receiver 600.

The multiplexer 1420 multiplexes and supplies power to at least one wireless power transmitter corresponding to the position of the wireless power receiver 600. The multiplexer 1420 may receive location information of the wireless power receiver 600 from the first sensor 1440 and specify a transmitter to transmit power among the plurality of transmitters 1450-1 to 1450-n.

The multiplexer 1420 may further include an amplifier to control power of the power source 1410 to be transmitted to the plurality of wireless power transmitters 1450-1 through 150-n.

The power converter 1430 may control power based on power transmission efficiency of the multiplexed power for each of the plurality of wireless power transmitters 1450-1 to 1450-n. The power converter 1430 may receive power transmission efficiency transmitted to the receiver 600 for each of the wireless power transmitters 1450-1 to 1450-n from a second sensor to be described later. Hereinafter, FIG. 22 will be described in more detail.

According to FIG. 22, the wireless power transmitter 500 may further include a second sensor 1440-2 and a plurality of amplifiers 1460-1 to 1460-n in addition to the components of FIG. 15.

The first sensor 1440-1 functions as the first sensor 1440 of FIG. 15, and the first sensor is a sensor that detects the position of the wireless power receiver 600.

The first sensor 1440-1 may specify a wireless power transmitter and transmit specific information to the multiplexer 1420.

The second sensor 1440-2 may satisfy alignment with the receiver 600 and a preset level among the plurality of wireless power transmitters 1450-1-1450-n corresponding to the position of the receiver 600. You can select a wireless power transmitter. The second sensor 1440-2 may select a group of wireless power transmitters (or transmitting coils) with excellent alignment, and may select the best wireless power transmitter.

Herein, the power transmitter having excellent alignment refers to a power transmitter having a large magnetic field formed with the wireless power receiver 600 and having excellent power filled in a battery included in the wireless power receiver.

If necessary, the second sensor may receive necessary charging information from the wireless power receiver 600 through in-band (or out-of-band) communication.

In another embodiment, the second sensor may detect an area of the receiver 600 on the charging pad 290 and transmit the detected area to the power converter 1430.

In another embodiment, the second sensor may determine the charging efficiency of each of the wireless power transmitters and transmit the same to the power converter 1430.

In addition, the second sensor 1440-2 may select a transmitter to transmit wireless power and transmit selection information to the power converter 1430. Transmission of the selection information will be described below with reference to FIG. 17.

In the present specification, it is assumed that the first sensor 1440-1 transmits specific information to the multiplexer 1420, and the second sensor 1440-2 transmits the selection information to the power converter 1430, but is not limited thereto. It doesn't happen. In addition, in the present specification, the power converter 1430 will be described as a component that generally controls the wireless power transmission apparatus.

According to FIG. 23A, the first sensor 1440-1 detects the position of the receiver 600, and transmits specific information of the detected receiver 600 to the multiplexer 1420. For example, a first transmitter 1450-1, a second transmitter 1450-2, and a fifth transmitter 1450-5 are currently specified. That is, the first sensor 1440-1 indicates that the first, second, and fifth transmitters 1450-1, 1450-2, and 1450-5 transmit the wireless power to the receiver 600 in terms of efficiency. To judge.

According to FIG. 23B, the second sensor 1440-2 is most aligned with the receiver 600 among the detected first, second, and fifth transmitters 1450-1, 1450-2, and 1450-5. You can choose a transmitter that fits you well. Here, it is determined that the fifth transmitter 1450-5 has the best alignment with the receiver 600.

In this case, the power converter 1430 may receive the selection information from the second sensor 1440-2 and transmit wireless power to the receiver 600 only through the fifth transmitter 1450-5. However, this is only an example, and the second sensor 1440-2 may select a transmitter group and transmit the selection information to the power converter 1430.

In addition, the power converter 1430 may control the first sensor 1440-1 and the second sensor 1440-2 to perform the above-described functions.

In addition, the power converter 1430 may re-discover the transmitter having excellent alignment with the receiver 600 by changing the direction of the magnetic field by changing the current flow of the plurality of transmitters 1450-1 to 1450-n. If necessary, communication with the receiver 600 may be performed.

The multiplexer 1420 may be connected to the plurality of amplifiers 1460-1 to 1460-n. The plurality of amplifiers 1460-1-1460-n perform a function of transmitting power of the power source 1410 evenly to the plurality of transmitters 1450-1-1450-n.

Although the plurality of amplifiers 1460-1 to 1460-n have been described as being configured separately from the multiplexer 1420, they may be included in the multiplexer 1420.

According to FIG. 24, a specific or selected transmitter from the first sensor 1440-1 and the second sensor 1440-2 may transmit power to the receiver 600.

At this time, the power conversion unit 1430, the specified first transmitter and the second transmitter is excellent in alignment with the receiver 600, and transmits power at high power, and the third and fourth transmitters transmit wireless power at low power. The transmitter may be controlled to transmit to the receiver 600. For example, the power converter 1430 may transmit wireless power to the receiver 600 at 5V power to the first transmitter and the second transmitter, and transmit power to less than 5V to the third and fourth transmitters.

Here, the wireless power transmitter 500 may be applied with an electromagnetic induction method defined in a wireless power consortium (WPC) or / and a power matters alliance (PMA), but an electromagnetic resonance method and an RF transmission method may also be used. However, in the present specification, the electromagnetic induction method will be described by employing the electromagnetic induction method defined in the WPC standard.

The wireless power transmitter 500 includes a system unit 1830, a power converter 1820, a transmission communication & control unit 1810, a multiplexer 1420, a sensor 1440, and a plurality of transmitters 1840-1840. -5).

The plurality of transmitters 1840-1 to 1840-5 generate AC current by AC power supplied from the system unit 1830. Due to the electromagnetic induction by such an alternating current, alternating current is also induced in the receiver 600 that is physically spaced apart. However, this may be different if the electromagnetic induction method and the electromagnetic resonance method.

When the power converter 1820 receives power (for example, 5V INPUT) from the system unit 1830, the power converter 1820 may convert the power into a specific voltage. The power converter 1820 may include at least one of a DC / DC converter, an AC / DC converter, and a power amplifier, but is not limited thereto. Do not.

Unlike the power converter 1430, the power converter 1820 may not include a module for controlling the wireless power transmitter 500.

The transmission communication & control unit 1810 may control not only the power conversion unit 1820 but also communication with components other than the wireless power transmission apparatus 500, but is not limited thereto.

The transmission communication & control unit 1810 can include a matching circuit for maximizing power transmission efficiency. The transmit communication & control unit 1810 can include a rectifier and a smoothing circuit. The rectifier may be used as a silicon rectifier and may be equivalent to the diode D1, but is not limited thereto.

The system unit 1830 is a unit defined in the WPC standard, and provides all functions (e.g., external power terminal input means, provide power input, control a plurality of wireless power transmitters, and user interface) of electronic devices (e.g., base stations and wireless power transmitters) And the like). The system unit 1830 may be included in the electronic device if wireless power transmission is possible.

The wireless power transmitter 500 for supplying power to the receiver 600 detects a position of the receiver 600 on the charging pad 290 and multiplexes power with at least one wireless power transmitter corresponding to the position of the receiver. And supply the multiplexed power based on the power transmission efficiency of each wireless power transmitter.

The above-described wireless power transmission and reception method may transmit and receive wireless power using an electromagnetic induction method and an electromagnetic resonance method, and may use the above method at the time of transmission and reception. In addition, the wireless power transmission and reception apparatus 500 may transmit and receive wireless power using an RF method using an antenna.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The method according to the embodiment described above may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape , Floppy disks, optical data storage devices, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).

The computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above-described method may be easily inferred by programmers in the art to which the embodiments belong.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The present invention relates to wireless charging technology, and may be applied to an apparatus and system for controlling wireless power transmission.

Claims

In the wireless power transmitter for supplying power to the wireless power receiver,

A first sensor sensing a position of the receiver on a charging pad;

A multiplexer for multiplexing and supplying power to at least one wireless power transmitter corresponding to the position of the receiver; And

And a power converter configured to control the multiplexed power based on power transmission efficiency for each of the at least one wireless power transmitter.
The method of claim 1,

The first sensor,

When the receiver approaches the charging pad, the wireless power transmitter for detecting the position of the receiver through a change in magnetic flux density or a change in impedance.
The method of claim 1,

The first sensor,

Wireless power transmitter for specifying at least one wireless power transmitter corresponding to the position of the receiver, and transmits specific information to the multiplexer.
The method of claim 3,

The first sensor,

Wireless power transmitter for generating the specific information in the form of a pulse signal and transmits to the multiplexer.
The method of claim 1,

A second sensor selecting at least one wireless power transmitter corresponding to a position of the receiver, wherein the wireless power transmitter satisfies a preset level, and transmits selection information to the power converter; Wireless power transmitter.
The method of claim 5,

The second sensor,

Wireless power transmitter for generating the selection information in the form of a pulse signal and transmits to the power converter.
The method of claim 1,

At least one amplifier corresponding to each of the at least one wireless power transmitter;

The at least one amplifier is connected to the multiplexing unit wireless power transmission apparatus.
The method of claim 1,

The power converter,

And differentially adjust the power of each of the wireless power transmitters based on occupancy of the area of the receiver.
A control method of a wireless power transmitter for supplying power to a wireless power receiver,

Sensing the position of the receiver on a charging pad;

Multiplexing and supplying power to at least one wireless power transmitter corresponding to the position of the receiver; And

And controlling power based on power transmission efficiency of each of the at least one wireless power transmitter.
The method of claim 9,

The detecting step,

When the receiver is approaching the charging pad, the control method of the wireless power transmitter for detecting the position of the receiver through a change in magnetic flux density or a change in impedance.
The method of claim 9,

The detecting step,

Specifying at least one wireless power transmitter corresponding to the position of the receiver, and providing specific information to the multiplexer; Control method of a wireless power transmission apparatus further comprising.
The method of claim 11,

Providing to the multiplexer,

And controlling the wireless power transmitter to generate the specific information in the form of a pulse signal and provide the specific information to the multiplexer.
The method of claim 9,

Selecting a wireless power transmitter that satisfies a preset level of alignment with the receiver among at least one wireless power transmitter corresponding to the position of the receiver, and transmitting selection information to a power converter; Control method of the power transmission device.
The method of claim 13,

The step of transmitting to the power converter,

And generating the selection information in a pulse signal form and transmitting the generated selection information to the power conversion unit.
The method of claim 9,

At least one amplifier corresponding to each of the at least one wireless power transmitter,

And the at least one amplifier is connected to the multiplexer.
The method of claim 9,

Controlling the power,

And controlling the power of each of the wireless power transmitters differentially based on a share of the area of the receiver.