KR20170111393A - Apparatus for Transferring Wireless Power and Method for Controlling Power of The Same - Google Patents

Abstract

The present invention relates to a wireless power transmission apparatus and a power control method thereof, and a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus according to an embodiment of the present invention includes: A power control table storage unit for storing a power control table in which receiver device information and receiver position information for the position of the wireless power receiving apparatus on the charging area of the wireless power transmission apparatus are mapped with initial power supply; An initial power determination unit for determining a first initial power supply using the power control table based on first receiver position information, a power offset determination unit for determining a power offset according to the first receiver device information, 1 wireless power < RTI ID = 0.0 > currently connected < / RTI > It may include a power controller for controlling power to be transmitted to the new device.

Description

[0001] The present invention relates to a wireless power transmission apparatus and a power control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technology, and more particularly, to a wireless power transmission device and a power control method thereof capable of adaptively controlling transmission power based on characteristics and position of a wireless power reception device.

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

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

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

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

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

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

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

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

Generally, the power control in the wireless charging system is performed by the wireless power receiver sensing the strength of the received power and transmitting a predetermined power control request signal to the wireless power transmitter according to the detection result.

However, according to the conventional algorithm for controlling the transmission power, there is a problem that it takes a long time until the transmission power reaches the power required by the wireless power receiver.

It is an object of the present invention to provide a wireless power transmission apparatus and a power control method therefor.

It is another object of the present invention to provide a wireless power transmission apparatus and its power control method capable of quickly reaching a power required by a wireless power receiver in consideration of characteristics and position of a wireless power receiver.

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

The present invention can provide a wireless power transmission apparatus and a power control method thereof.

A wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus according to an exemplary embodiment of the present invention includes a wireless power transmitting apparatus for receiving wireless device information on the characteristics of the wireless power receiving apparatus, A power control table storage unit for storing a power control table in which receiver position information for a position of the power receiving apparatus is mapped to an initial power supply; An initial power determination unit for determining a first initial power supply using the power control table based on first receiver device information and first receiver position information; A power offset determining unit for determining a power offset according to the first receiver device information; And a power control unit for controlling power to be transmitted to a wireless power receiving apparatus currently connected according to the first initial supply power and the power offset.

According to one embodiment, the power control table may be stored at the time of manufacture of the wireless power transmission apparatus or at the time of software update, or each time the wireless power reception apparatus is connected, or may receive a table corresponding to the wireless power reception apparatus Lt; / RTI >

According to an embodiment, the initial supply power determining unit may be configured to retrieve at least one initial supply power corresponding to receiver device information closest to the first receiver device information, and to determine at least one of the retrieved at least one initial supply power The first initial supply power corresponding to the receiver position information closest to the first receiver position information may be selected and the first initial supply power may be determined by correcting the selected initial supply power using the first receiver position information.

According to an embodiment, the initial supply power determining unit may determine at least one initial supply power corresponding to the receiver device information having the same information as the information included in the first receiver device information and the corresponding information on the power control table can do.

According to one embodiment, the first receiver device information may include at least one of a manufacturer code, a device identifier, a power rating, and a maximum power.

According to one embodiment, the first receiver position information may be calculated based on signal receiving sensitivity of the wireless power receiving apparatus or information sensed by a separate sensor.

According to one embodiment, the magnitude of the power offset may gradually decrease with time.

According to one embodiment, the first receiver device information and the first receiver position information may be mapped to the first initial power supply and updated in the power control table.

The power control method of a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus according to another exemplary embodiment of the present invention includes receiving device information on characteristics of the wireless power reception apparatus, Storing a power control table in which receiver position information for the position of the wireless power receiving apparatus on the wireless power receiving apparatus is mapped to an initial power supply; Determining a first initial power supply using the power control table based on first receiver device information and first receiver position information; Determining a power offset in accordance with the first receiver device information; And controlling power to be transmitted to the wireless power receiving apparatus currently connected according to the first initial supply power and the power offset.

According to another embodiment of the present invention, there is provided a computer-readable recording medium storing a program for executing any one of the power control methods.

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

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

According to the wireless power transmission apparatus and the power control method thereof according to an embodiment of the present invention, not only the receiver device information on the inherent characteristics of the wireless power receiver but also the receiver position information according to the relative position between the wireless power receiver and the wireless power transmitter The initial supply power as close as possible to the required power can be determined.

In addition, as the power offset is determined taking the receiver device information into account and the magnitude of the power offset is reduced over time, the power consumption of the wireless power transmitter The time to reach the required power can be relatively short.

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

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment of the present invention.
4 is a state transition diagram for explaining the wireless power transmission procedure defined in the WPC standard.
5 is a state transition diagram for explaining the wireless power transmission procedure defined in the PMA standard.
6 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment of the present invention.
FIG. 7 is a state transition diagram for explaining a state transition procedure in a wireless power transmitter supporting an electric resonance system according to an embodiment of the present invention. Referring to FIG.
8 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.
9 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to the FIG.
10 is a diagram for explaining a modulation and demodulation method of a wireless power signal according to an embodiment of the present invention.
11 is a diagram for explaining a packet format according to an embodiment of the present invention.
12 is a view for explaining the types of packets that can be transmitted in the ping stage of the wireless power receiving apparatus according to the present invention.
13 is a diagram for explaining a procedure for transmitting an initial packet in a wireless power receiving apparatus according to an embodiment of the present invention.
14 is a diagram for explaining a message format of an identification packet according to an embodiment of the present invention.
15 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to the present invention.
16 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format of the packet in a wireless power receiving apparatus according to an embodiment of the present invention.
17 is a flowchart illustrating a power control method in a wireless power transmitter according to an embodiment of the present invention.
FIG. 18 is a diagram illustrating embodiments in which the power control table shown in FIG. 17 is generated.
19 is a diagram showing an embodiment of a power control table.
20 is a flow chart showing in more detail the step of determining the initial supply power shown in Fig.
FIG. 21 is a block diagram showing a control unit for performing the power control method described in FIGS. 17 to 20. FIG.
22 is a graph comparing a conventional power control algorithm and a power control algorithm according to an embodiment of the present invention.

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

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

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

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

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

The receiver according to the present invention may be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, A portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, a smart watch, etc. However, the present invention is not limited thereto. It suffices.

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

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

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

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

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

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

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

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

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

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

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

For example, as shown in 200a, the wireless power receiving terminal 20 may include a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices may be connected to one wireless power transmitting terminal 10, Charging may also be performed. At this time, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses in a time division manner, but the present invention is not limited thereto. For example, Power can be distributed and transmitted to a plurality of wireless power receiving apparatuses using different allocated frequency bands.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus 10 is set to at least one of the required power amount for each wireless power receiving apparatus, the battery charging state, the power consumption amount of the electronic apparatus, Can be determined adaptively based on

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

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

As an example, the wireless power transmitter may be equipped with three transmit coils 111, 112, 113. Each transmit coil may overlap a portion of the transmit coil with a different transmit coil, and the wireless power transmitter may include a predetermined sense signal 117, 127 for sensing the presence of the wireless power receiver through each transmit coil - And sequentially transmits digital ping signals in a predefined order.

As shown in FIG. 3, the wireless power transmitter sequentially transmits the detection signal 117 through the primary sensing signal transmission procedure shown in reference numeral 110, and receives a signal strength indicator (Signal Strength Indicator 116 (or signal strength packet) may be received. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in the reference numeral 120, and the signal strength indicator 126 is transmitted to the transmission coils 111 and 112 It is possible to control the efficiency (or charging efficiency) - that is, the state of alignment between the transmitting coil and the receiving coil - to identify a good transmitting coil and to allow power to be delivered through the identified transmitting coil, .

As shown in FIG. 3, the reason why the wireless power transmitter performs the two detection signal transmission procedures is to more accurately identify to which transmission coil the reception coil of the wireless power receiver is well aligned.

If the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112 as shown in the aforementioned numerals 110 and 120 of FIG. 3, Selects a transmission coil having the best alignment based on the received signal strength indicator 126 in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil .

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

Referring to FIG. 4, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 410, a ping phase 420, an identification and configuration phase 430, And a power transfer phase (step 440).

The selection step 410 may be a phase transition when a specific error or a specific event is detected while initiating a power transmission or maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, in a selection step 410, the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object is placed on the interface surface, it can transition to the step 420 (S401). In the selection step 410, the transmitter transmits an analog ping signal of a very short pulse and can detect whether an object exists in the active area of the interface surface based on the current change of the transmission coil.

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

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

In the identifying and configuring step 430, the sender may determine whether the packet is unexpected, whether a desired packet is received during a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract), the process can be shifted to the selection step 410 (S405).

Once the identification and configuration for the receiver is complete, the transmitter may transition to power transfer step 240, which transmits the wireless power (S406).

In the power transfer step 440, the transmitter determines whether an unexpected packet is received, a desired packet is received for a predefined period of time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 410 can be performed (S407).

In addition, in the power transfer step 440, if the transmitter needs to reconfigure the power transfer contract according to changes in the transmitter state, etc., it may transition to the identification and configuration step 430 (S408).

The power transmission contract may be set based on the status and characteristic information of the transmitter and the receiver. For example, the transmitter status information may include information on the maximum amount of transmittable power, information on the maximum number of receivable receivers, and the receiver status information may include information on the requested power and the like.

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

Referring to FIG. 5, power transmission from a transmitter to a receiver according to the PMA standard is largely divided into a standby phase 510, a digital ping phase 520, an identification phase 530, A Power Transfer Phase 540, and an End of Charge Phase 550. FIG.

The waiting step 510 may be a step of performing a receiver identification procedure for power transmission or transitioning to a specific error or a specific event while sensing a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at a standby step 510, the transmitter may monitor whether an object is present on the Charging Surface. If the transmitter detects that an object has been placed on the charging surface, or if an RXID retry is in progress, the digital switching may proceed to step 520 (S501). Here, RXID is a unique identifier assigned to a PMA compatible receiver. At the standby step 510, the transmitter transmits an analog ping of a very short pulse and, based on the change in current of the transmitting coil, causes the object to move to the active surface of the interface surface-for example, It can be detected whether or not it exists.

The transmitter transited to the digital pinging step 520 sends a digital finger signal to identify whether the sensed object is a PMA compatible receiver. When sufficient power is supplied to the receiving end by the digital ding signal transmitted by the transmitter, the receiver can modulate the received digital ding signal according to the PMA communication protocol and transmit a predetermined response signal to the transmitter. Here, the response signal may include a signal strength indicator indicating the strength of the power received at the receiver. At step 520, the receiver can transition to the identification step 530 if a valid response signal is received (S502).

If the response signal is not received or it is determined that it is not a PMA compliant receiver, i.e., it is a Foreign Object Detection (FOD), at step 520, the transmitter can transition to the wait step 510 (S503). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 530, the transmitter may transition to the wait step 510 if the receiver identification procedure fails or the receiver identification procedure must be re-performed and the receiver identification procedure has not been completed for a predefined period of time S504).

If the transmitter succeeds in identifying the receiver, the transmitter may transition from the identifying step 530 to the power transfer step 540 and start charging (S505).

In the power transfer step 540, the transmitter determines if the desired signal is not received within a predetermined time (Time Out), an FO is detected, or if the voltage of the transmit coil exceeds a predefined reference value, (S506).

Also, in the power transmission step 540, if the temperature sensed by the temperature sensor provided inside the transmitter exceeds a predetermined reference value, the transmitter may transition to the completion of charging step 550 (S507).

In the charge completion step 550, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter can transition to the standby state 510 (S509).

If the measured temperature drops below the reference value in the over temperature state, the transmitter may transition from the charging completion step 550 to the digital charging step 520 in step S510.

In the digital ping phase 520 or the power transfer phase 540, the transmitter may transition to the charge completion phase 550 (S508 and S511) when an End Of Charge (EOC) request is received from the receiver.

6 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment of the present invention.

6, the state of the wireless power receiver is largely divided into a disabled state 610, a boot state 620, an enabled state 630 (or an On state), and a system error state System Error State, 640).

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

The activated state 630 may be divided into an optimum voltage state 631, a low voltage state 632, and a high voltage state 633 depending on the value of V _RECT .

The wireless power receiver in the deactivation state 610 may transition to the boot state 620 if the measured V _RECT value is greater than or equal to the predefined V _{RECT_BOOT} value.

In the boot state 620, the wireless power receiver may establish an out-of-band communication link with the wireless power transmitter and wait until the V _RECT value reaches the power required at the load end.

The wireless power receiver in the boot state 620 may transition to the active state 630 and begin charging if the V _RECT value is ascertained that the power required at the lower end has been reached.

The wireless power receiver in the active state 630 may transition to the boot state 620 if it is confirmed that charging is complete or charging is interrupted.

In addition, the wireless power receiver in the active state 630 may transition to a system fault state 640 if a predetermined system fault is detected. Here, system faults may include overvoltage, overcurrent, and overheating, as well as other predefined system fault conditions.

In addition, the wireless power receiver in the active state 630 may transition to the inactive state 610 if the V _RECT value falls below the V _{RECT_BOOT} value.

In addition, the wireless power receiver in the boot state 620 or the system fault state 640 may transition to the inactive state 610 if the V _RECT value falls below the V _{RECT_BOOT} value.

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

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

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

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

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

In the power saving state 720, the wireless power transmitter periodically generates and transmits a first beacon sequence (first beacon sequence) for detecting the presence or absence of a conductive object on the charged area, and changes the impedance of the receiving resonator, Load Variation- can be detected.

Also, in the power saving state 720, the wireless power transmitter may periodically generate and transmit a predetermined second beacon sequence (Second Beacon Sequence) for identifying the sensed object. At this time, the transmission timing of the beacon may be determined such that the first beacon sequence and the second beacon sequence do not overlap with each other. Hereinafter, for convenience of explanation, the first beacon sequence and the second beacon sequence will be referred to as a short beacon sequence and a long beacon sequence, respectively.

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

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

Also, in the power saving state 720, the wireless power transmitter periodically generates and transmits the second beacon sequence-that is, the long beacon sequence-to provide sufficient power for the booting and response of the wireless power receiver .

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

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

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

For example, the advertisement signal may include message identification information for identifying a message defined in the out-of-band communication standard, unique service identification information for identifying whether the wireless power receiver is legitimate or compatible with the wireless power transmitter, Information for identifying the category of the wireless power receiver, wireless power receiver authentication information, an overvoltage protection function, and an overvoltage protection function. And software version information mounted on the wireless power receiver.

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

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

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

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

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

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

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

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

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

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

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

In accordance with another embodiment of the present invention, a wireless power transmitter may be configured to determine a power intensity to be received by a wireless power receiver based on at least one of the current available power, the priority of each wireless power receiver, May be adaptively determined. Here, the power intensity of each wireless power receiver can be determined, but not limited to, how much power should be received at a ratio of the maximum power that can be processed by the rectifier of the wireless power receiver.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

8 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.

8, the wireless power transmitter 800 may include a power conversion unit 810, a power transmission unit 820, a communication unit 830, a control unit 840, and a sensing unit 850 . It should be noted that the configuration of the wireless power transmitter 800 described above is not necessarily an essential configuration, and may be configured to include more or less components.

As shown in FIG. 8, when power is supplied from the power supply unit 860, the power conversion unit 810 can convert the power to a predetermined intensity.

For this, the power conversion unit 810 may include a DC / DC conversion unit 811 and an amplifier 812.

The DC / DC converting unit 811 may convert DC power supplied from the power supply unit 850 into DC power having a specific intensity according to a control signal of the controller 840.

At this time, the sensing unit 850 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the control unit 840. In addition, the sensing unit 850 may measure the internal temperature of the wireless power transmitter 800 and may provide the measurement result to the controller 840 in order to determine whether overheating occurs. For example, the control unit 840 may adaptively cut off the power supply from the power supply unit 850 or block the power supply to the amplifier 812 based on the voltage / current value measured by the sensing unit 850 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 810 to cut off the power supplied from the power supply unit 850 or cut off the power supplied to the amplifier 812.

The amplifier 812 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 840. For example, the control unit 840 may receive the power reception status information and / or the power control signal of the wireless power receiver through the communication unit 830, and may receive the power control information based on the received power reception status information and / So that the gain of the amplifier 812 can be adjusted dynamically. For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmitting unit 820 may be configured to include a multiplexer 821 (or a multiplexer), a transmitting coil 822, and the like. In addition, the power transmitting unit 820 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 812 received via the multiplexer 821 to AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer 821 to generate AC power. However, this is merely one embodiment, and another example is that before the amplifier 812 It should be noted that they may be mixed only or later.

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

8, the power transmission unit 820 includes a multiplexer 821 and a plurality of transmission coils 822 for controlling the output power of the amplifier 812 to be transmitted to the transmission coil, that is, Th to n < th > transmit coils.

The controller 840 according to an embodiment of the present invention may transmit power by time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected. For example, if the wireless power transmitter 800 is identified with three wireless power receivers-i. E., The first through third wireless power receivers-via three different transmit coils, i. E., First through third transmit coils, respectively , The control unit 840 controls the multiplexer 821 to control power to be transmitted through a specific transmission coil in a specific time slot. At this time, the amount of power transmitted to the corresponding wireless power receiver may be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. The amplification rate of the amplifier 812 of the wireless power receiver may be controlled to control the transmission power of each wireless power receiver.

The control unit 840 may control the multiplexer 821 so that the detection signals can be sequentially transmitted through the first to n'th transmission coils 822 during the first sensing signal sending procedure. At this time, the control unit 840 can identify the transmission time point of the sensing signal by using the timer 855. When the sensing signal transmission time arrives, the control unit 840 controls the multiplexer 821 to transmit the sensing signal through the transmission coil It can be controlled to be transmitted. For example, the timer 850 can send a specific event signal to the control unit 840 at predetermined intervals during the ping transmission step. When the event signal is detected, the control unit 840 controls the multiplexer 821 to transmit the corresponding event It is possible to control the digital ping to be transmitted through the coil.

In addition, the control unit 840 may transmit a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 832 during the first detection signal transmission procedure, Lt; / RTI > received signal strength indicator. In the second detection signal transmission procedure, the controller 840 controls the multiplexer 821 so that the signal strength indicator can be transmitted through the transmission coil (s) You may. In another example, when there are a plurality of transmission coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 840 transmits the transmission coils in which the signal strength indicator having the largest value is received, In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 821 may be controlled according to the determination result.

The modulator 831 may modulate the control signal generated by the controller 840 and transmit the modulated control signal to the multiplexer 821. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 832 can demodulate the detected signal and transmit the demodulated signal to the controller 840 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

The demodulation unit 832 can identify which of the transmission coils the demodulated signal is received and provide the control unit 840 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

 The demodulator 832 demodulates the signal received through the transmission coil 823 and transmits the demodulated signal to the controller 840. In one example, the demodulated signal may include, but is not limited to, a signal strength indicator, and the demodulated signal may include various status information of the wireless power receiver.

In one example, the wireless power transmitter 800 may acquire the signal strength indicator through in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 800 can transmit wireless power using the transmit coil 822, as well as exchange various information with the wireless power receiver via the transmit coil 822. [ In another example, the wireless power transmitter 800 may further include a separate coil corresponding to each of the transmit coil 822 (i.e., first to n < th > transmit coils) It should be noted that it may also perform in-band communication with the receiver.

In the description of FIG. 8, the wireless power transmitter 800 and the wireless power receiver perform in-band communication. However, this is only an example, and the frequency band used for wireless power signal transmission Directional communication through different frequency bands. For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

In particular, the wireless power transmitter 800 according to an embodiment of the present invention may adaptively provide a fast charge mode and a general low power charge mode at the request of the wireless power receiver.

The wireless power transmitter 800 may send a signal of a predetermined pattern - a first packet, for convenience of explanation, when the fast charging mode is supported. The wireless power receiver 800 can identify that the wireless power transmitter 800 being connected is capable of fast charging when the first packet is received.

In particular, the wireless power receiver may send a predetermined first response packet to the wireless power transmitter 800 requesting fast charging if fast charging is required.

In particular, the wireless power transmitter 800 may automatically switch to the fast charge mode and initiate fast charge when a predetermined time has elapsed since the first response packet was received.

For example, when the control unit 840 of the wireless power transmitter 800 transits to the power transmission step 440 or 540 of FIGS. 4 to 5, the control unit 840 controls the first packet to be transmitted through the transmission coil 822 However, this is only one example, and another example of the present invention may be the first packet sent out in the identification and configuration step 430 of FIG. 4 or the identifying step 530 of FIG.

It should be noted that another embodiment of the present invention may transmit encoded information that can identify whether or not fast charge support is possible to the digital ring signal transmitted by the wireless power transmitter 800. [

The wireless power receiver may send a predetermined charge mode packet to the wireless power transmitter 800 where the charge mode is set to fast charge if fast charge is required at any point in the power transfer phase. 10 to 14. Of course, the wireless power transmitter 800 and the wireless power receiver may be configured such that when the charging mode is changed to the fast charging mode, Lt; RTI ID = 0.0 > transmit / receive < / RTI > For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the overvoltage determination criterion, the over temperature criterion, the low-voltage / high- Level (Optimum Voltage Level), power control offset, and the like can be changed and set.

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

9 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to the FIG.

9, the wireless power receiver 900 includes a receiving coil 910, a rectifier 920, a DC / DC converter 930, a load 940, a sensing unit 950, a communication unit 960, and a main control unit 970. Here, the communication unit 960 may include a demodulation unit 961 and a modulation unit 962.

Although the wireless power receiver 900 shown in the example of FIG. 9 is shown as being capable of exchanging information with the wireless power transmitter 800 via in-band communication, this is only one embodiment, The communication unit 960 according to another embodiment of the present invention may provide short-distance bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

The AC power received through the receiving coil 910 may be transmitted to the rectifying section 920. [ The rectifier 920 may convert the AC power to DC power and transmit it to the DC / DC converter 930. The DC / DC converter 930 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 940 and then deliver it to the load 940.

The sensing unit 950 may measure the intensity of the DC power output from the rectifier 920 and provide it to the main control unit 970. Also, the sensing unit 950 may measure the intensity of the current applied to the reception coil 910 according to the wireless power reception, and may transmit the measurement result to the main control unit 970. Further, the sensing unit 950 may measure the internal temperature of the wireless power receiver 900 and provide the measured temperature value to the main control unit 970.

For example, the main control unit 970 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage occurs, a predetermined packet indicating that an overvoltage has occurred can be generated and transmitted to the modulator 962. Here, the signal modulated by the modulating unit 962 may be transmitted to the wireless power transmitter 800 through the receiving coil 910 or a separate coil (not shown). The main control unit 970 can determine that the detection signal is received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value. When receiving the detection signal, the signal intensity indicator corresponding to the detection signal is received by the modulation unit 962 The demodulator 961 may control the AC power signal between the receiving coil 910 and the rectifier 920 or the AC power signal between the rectifier 920 and the rectifier 920 to be transmitted to the wireless power transmitter 800. [ DC power signal to identify whether or not the detection signal has been received, and provide the result of the identification to the main control unit 970. [ At this time, the main control unit 970 can control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulation unit 961. [

In particular, the main control unit 790 according to the embodiment of the present invention may determine whether the connected wireless power transmitter is a wireless power transmitter capable of fast charging based on information demodulated by the demodulator 960.

Also, the main control unit 970 generates a charge mode packet corresponding to the received fast charge request signal when a predetermined fast charge request signal for requesting fast charge is received from the electronic device 30 of FIG. 1, (961). Here, the fast charge request signal from the electronic device can be received according to the user menu selection on the predetermined user interface.

The main control unit 970 according to another exemplary embodiment of the present invention automatically requests the wireless power transmitter to perform fast charging based on the battery remaining amount or wireless power It is also possible to control the transmitter to stop fast charging and switch to a normal low-power charging mode.

The main control unit 970 according to another embodiment may monitor the power consumption of the electric device during charging to the general low-power charging mode in real time. If the power consumption of the electronic apparatus is equal to or greater than a predetermined reference value, the main control unit 970 may generate a predetermined charging mode packet requesting switching to the fast charging mode and transmit the packet to the modulation unit 961. [

The main control unit 970 according to another embodiment of the present invention can determine whether overheating occurs by comparing the internal temperature value measured by the sensing unit 950 with a predetermined reference value. If overheating occurs during fast charging, the main control unit 970 may generate and transmit a charging mode packet so that the wireless power transmitter switches to a general low power charging mode.

The main control unit 970 according to another embodiment of the present invention changes the charging mode based on at least one of the battery charging rate, the internal temperature, the intensity of the rectifier output voltage, the CPU usage rate mounted on the electronic equipment, And if it is determined that the charging mode should be changed, the charging mode packet including the charging mode value to be changed may be generated and transmitted to the wireless power transmitter.

10 is a diagram for explaining a modulation and demodulation method of a wireless power signal according to an embodiment of the present invention.

As shown in FIG. 10, the wireless power transmitter 10 and the wireless power receiver 20 can encode or decode a packet to be transmitted based on an internal clock having the same period.

Hereinafter, a method of encoding a packet to be transmitted will be described in detail with reference to FIGS. 1 to 10. FIG.

Referring to FIG. 1, when the wireless power transmitter 10 or the wireless power receiver 20 does not transmit a specific packet, the wireless power signal is modulated with modulation having a specific frequency, May be an alternating current signal. On the other hand, when the wireless power transmitting terminal 10 or the wireless power receiving terminal 20 transmits a specific packet, the wireless power signal may be an alternating signal modulated by a specific modulation method, as shown in FIG. For example, the modulation scheme may include, but is not limited to, an amplitude modulation scheme, a frequency modulation scheme, a frequency and amplitude modulation scheme, a phase modulation scheme, and the like.

The binary data of the packet generated by the wireless power transmitting terminal 10 or the wireless power receiving terminal 20 may be subjected to differential bi-phase encoding as indicated by reference numeral 1020. [ Specifically, the differential two-stage encoding has two state transitions to encode data bit one and one state transition to encode data bit zero. That is, the data bit 1 is encoded such that the transition between the HI state and the LO state occurs at the rising edge and the falling edge of the clock signal, and the data bit 0 is at the rising edge of HI State and the LO state may be encoded to occur.

The encoded binary data can be subjected to a byte encoding scheme as shown in the above-mentioned reference numeral 1030. [ Referring to reference numeral 1030, a byte encoding technique according to an embodiment of the present invention includes a start bit and a stop bit for identifying the start and type of a corresponding bitstream, for an 8-bit encoded binary bitstream, , And a parity bit for detecting whether or not an error has occurred in the bitstream (byte).

11 is a diagram for explaining a packet format according to an embodiment of the present invention.

11, a packet format 1100 used for information exchange between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 is configured to acquire synchronization for demodulating the packet and to identify an accurate start bit of the packet A header 1120 for identifying the type of the message included in the packet, a message for transmitting the content of the packet (or payload), a preamble field 1120 for transmitting the message, 1130) field and a checksum (1140) field for identifying whether an error has occurred in the packet.

As shown in FIG. 11, the packet receiving end may identify the size of the message 1130 included in the packet based on the header 1120 value.

In addition, the header 1120 may be defined for each step of the wireless power transmission procedure, and some values of the header 1120 may be defined at different levels. For example, referring to FIG. 11, it should be noted that the header value corresponding to the end power transfer in the ping phase and the power transmission phase in the power transfer phase may be equal to 0x02.

The message 1130 includes data to be transmitted at the transmitting end of the packet. For example, the data included in the message 1130 field may be, but is not limited to, a report, a request, or a response to the other party.

The packet 1100 according to another embodiment of the present invention may further include at least one of transmitting end identification information for identifying a transmitting end that transmitted the packet and receiving end identifying information for identifying a receiving end to receive the packet. Here, the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like. However, the present invention is not limited thereto.

The packet 1100 according to another embodiment of the present invention may further include predetermined group identification information for identifying a corresponding receiving group when the packet is to be received by a plurality of apparatuses.

12 is a view for explaining the types of packets that can be transmitted in the ping stage of the wireless power receiving apparatus according to the present invention.

12, the wireless power receiving apparatus can transmit a signal strength packet or a power transmission stop packet in a short-ranging step.

Referring to reference numeral 1201 in FIG. 12, a message format of a signal strength packet according to an exemplary embodiment may include a signal strength value having a size of 1 byte. The signal strength value may indicate the degree of coupling between the transmitting coil and the receiving coil and may be calculated based on the rectifier output voltage in the digital ping section, the open circuit voltage measured in the output blocking switch, Lt; / RTI > The signal strength value ranges from 0 to 255. If the actual measured value (U) for a particular variable is equal to the maximum value (Umax) of the corresponding variable, it can have a value of 255.

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

Referring to reference numeral 1202 in FIG. 12, the message format of the power transmission stop packet according to an exemplary embodiment may be configured as an end power transfer code having a size of 1 byte.

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

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

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

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

Reconfiguration can be used when renegotiation is required for power transmission conditions. No response can be used if the transmitter's response to the control error packet - meaning increasing or decreasing the strength of the power - is judged to be unhealthy.

13 is a diagram for explaining a procedure for transmitting an initial packet in a wireless power receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 13, when the rectifier output voltage is detected to be equal to or higher than a predetermined reference value in the selecting step, the wireless power receiving apparatus can immediately transition to the ping step. If the current level of the receiving coil exceeds the predetermined reference value in the step of pinging, it is necessary to transmit the initial packet within the time that can be maximum delayed for transmission of the predefined initial packet - hereinafter referred to simply as the initial packet transmission delay time - do. For example, the reference value for transition from the selection step to the ping step may be defined as 50% of the predefined stable current level value at the receiving end. Here, the initial packet transmission delay time may range from 19 to 64 ms, but is not limited thereto. The wireless power receiving apparatus may also determine the initial packet transmission delay time and transmit the initial packet transmission delay time determined through the configuration packet to the wireless power transmission apparatus.

For example, when the first packet is not received within a predetermined ping time window (T_ping_time_window) after the current value of the transmitting terminal exceeds 50% of the stable current level, the wireless power transmission apparatus transmits the power signal transmission within a predetermined end time (T_terminate) Can be stopped. Here, the interruption of the transmission of the power signal may mean the interruption of the transmission of the digital ping signal, but the present invention is not limited thereto, and the wireless power transmission apparatus may stop transmitting the digital ping and return to the selection step to transmit the analog ping It is possible.

In addition, if the wireless power transmission apparatus determines not to enter the identification and configuration step after receiving the signal strength packet as the first packet, the wireless power transmission apparatus transmits the power signal transmission within the predetermined expiration time (T_expire) . Here, not entering the identification and configuration step after receiving the initial packet may mean entering the selection step.

In addition, the wireless power transmission apparatus may suspend transmission of the power signal within the expiration time (T_expire) after it is confirmed that the first packet is not normally received.

In addition, when the wireless power transmission apparatus is normally receiving a first packet other than a signal strength packet (for example, an end power transfer packet), the wireless power transmission apparatus transmits the expiration time T_expire The transmission of the power signal may be interrupted.

The wireless power transmission apparatus may also determine a value of an offset applied to a control error value to be described later based on at least one of a power rating and a maximum power of the wireless power receiving apparatus included in the configuration packet. For example, in a wireless power receiving apparatus having a high power rating, an offset value can be relatively determined as compared with a wireless power receiving apparatus having a low power rating. In another example, the offset value may be determined such that the intensity of the power controlled according to the sum of the control error value and the offset value does not exceed the maximum power of the corresponding receiver.

14 is a diagram for explaining a message format of an identification packet according to an embodiment of the present invention.

Referring to FIG. 14, the message format of the identification packet includes a Version Information field, a Manufacturer Information field, an Extension Indicator field, and a Basic Device Identification Information field Lt; / RTI >

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

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

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

Referring to reference numerals 1401 to 1402, if the extension indicator value is 0, the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information and basic device identification information. On the other hand, if the extension indicator value is 1, the device identifier for the wireless power receiver may be a combination of manufacturer information, basic device identification information, and extended device identification information.

15 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to the present invention.

As shown in FIG. 15, the message format of the configuration packet may have a length of 5 bytes and may include a power class field, a maximum power field, a power control field, A count field, a window size field, a window offset field, and the like.

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

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

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

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

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

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

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

Referring to reference numeral 1502, the message format of the power control hold packet may be configured to include a power control hold time (T_delay). A plurality of power control hold packets may be transmitted during the identification and configuration phase. For example, up to seven power control pending packets may be transmitted. The power control hold time (T_delay) may have a value between a predefined power control hold minimum time (T_min: 5 ms) and a power control hold maximum time (T_max: 205 ms). The wireless power transmission apparatus can perform power control using the power control retention time of the power control retention packet last received in the identification and configuration step. Also, the wireless power transmission apparatus can use the T_min value as the T_delay value when the power control hold packet is not received in the identification and configuration step.

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

16 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format of the packet in a wireless power receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 16, in a power transmission step, a packet that can be transmitted by the wireless power receiving apparatus includes a control error packet, an end power transfer packet, a received power packet, A packet (Charge Status Packet), a packet defined by a manufacturer, and the like.

Reference numeral 1601 denotes a message format of a control error packet composed of a 1-byte control error value. Here, the control error value may be an integer value ranging from -128 to +127. If the control error value is negative, the transmission power of the radio power transmission apparatus decreases, and if it is positive, the transmission power of the radio power transmission apparatus can be increased.

Reference numeral 1602 denotes a message format of a control error packet composed of a 1-byte End Power Transfer Code. Here, the power transmission interruption code will be replaced with the description of FIG. 12 described above.

Reference numeral 1603 denotes a message format of a received power packet including a 1-byte received power value. Here, the received power value may correspond to the average rectifier received power value calculated during a predetermined period. The actual received power amount P _received can be calculated based on the maximum power and the power class included in the configuration packet 1501. [ As an example, the actual amount of power received can be calculated by (received power value / 128) * (maximum power / 2) * (10 ^{power rating} ).

Reference numeral 1604 denotes a message format of a Charge Status Packet consisting of a 1-byte Charge Status Value. The charge state value may indicate the battery charge amount of the wireless power receiving device. For example, the charge state value 0 means a completely discharged state, the charge state value 50 may mean a 50% charge state, and the charge state value 100 may mean a full charge state. If the wireless power receiving device does not include a rechargeable battery or can not provide charge state information, the charge state value may be set to OxFF.

17 is a flowchart illustrating a power control method in a wireless power transmitter according to an embodiment of the present invention.

Referring to FIG. 17, the wireless power transmitter can generate and store a power control table (S1701). Here, the power control table may be configured to map receiver device information (identification information and power information) for the characteristics of the wireless power receiver and receiver position information for the location of the wireless power receiver on the charging area of the wireless power transmitter to the initial power supply mapping table. The initial power supply may refer to the power initially supplied by the wireless power transmitter when the wireless power transmission from the wireless power transmitter to the wireless power receiver is initiated. When the wireless power transmitter complies with the WPC standard, the initial supply power and the supply power or required power to be described later may mean the output of the DC / DC converter 811 or the amplifier 812, It does not.

A description of how the power control table is generated will be described later with reference to FIG.

The wireless power transmitter may collect receiver device information and receiver position information (S1703). Here, the receiver device information and the receiver position information collected from the currently connected wireless power receiver may be referred to as first receiver device information and first receiver position information, respectively. The receiver device information may be transmitted to a wireless power transmitter by a wireless power receiver such as for iendtification and configuration of the wireless power receiver, for negotiation, or for power transfer, And can be obtained from various kinds of information.

If the wireless power receiver complies with the WPC standard, the receiver device information includes the manufacturer information and basic device identification information transmitted in the identification and configuration step 430, the power rating and maximum power transmitted in the power transfer step 440 .

The wireless power transmitter may determine an initial power supply according to receiver device information and receiver position information from the power control table (S1705). Here, the initial supply power determined corresponding to the currently connected wireless power receiver may be referred to as a first initial supply power. The determination of the initial power supply is an operation of determining the most appropriate initial power supply power according to the receiver device information and the receiver position information using the power control table, and will be described later with reference to FIGS. 19 and 20. FIG.

The wireless power transmitter may determine the power offset according to the receiver device information (S1707). The power offset means the difference between the current supply power and the previous supply power.

When the sign of the power offset is positive, the current supply power becomes higher than the previous supply power, and when the sign of the power offset is negative, the current supply power becomes lower than the previous supply power. When the wireless power transmitter complies with the WPC standard, the sign of the power offset can be determined by the sign of the control error value 1601 shown in FIG. That is, if the sign of the control error value 1601 having an integer value ranging from -128 to +127 is negative, the sign of the power offset becomes negative, and if the sign of the control error value 1601 is positive, Can also be positive.

The receiver device information may include a power class and a maximum power, the lower the power class and the maximum power, the smaller the power offset, and the higher the power class and the maximum power, the greater the power offset can be determined. This is because the lower the power rating, the more susceptible to fine power changes, and the lower the maximum power, the more likely the over-power will be delivered to the wireless power receiver due to the larger power offset.

In addition, as the power transfer proceeds from the initial power offset to the wireless power receiver, the magnitude of the subsequent power offset may gradually decrease. This means that the supplied power converges to the required power, which means the power output by the wireless power transmitter so that the wireless power receiver can receive the desired power.

In addition, the degree to which the power offset is reduced can be controlled at a certain rate (e.g., 100% - > 80% - > 60% ...) or a certain number (e.g., 5W-> 4W-> 3W ...) The present invention is not limited thereto. Also, the ratio or the numerical value may be determined to be smaller as the power level and the maximum power are lower, and the power offset may be determined as the power level and the maximum power are higher, as in the case of the power offset.

The wireless power transmitter may transmit power to the wireless power receiver according to the determined initial power and power offset (S1709).

That is, when the power transmission of the wireless power transmitter is started, the power corresponding to the initial supply power is output, the initial supply power and the power offset are calculated (e.g., summed) to determine the next supply power, . As described above, as the power offset is gradually reduced, the wireless power transmitter can output power close to the required power.

After the initial power supply has been determined, the wireless power transmitter may update the power control table (S1711). That is, the wireless power transmitter can update the power control table by mapping the receiver device information and receiver position information collected in step S1703 and the initial power supply determined in step S1705 and adding the mapping to the power control table.

Each of the steps shown in FIG. 17 may be performed by a control unit of the wireless power transmitter, for example, the control unit 840 of FIG. 8, or may be provided with an independent configuration for performing a power control method.

FIG. 18 is a diagram illustrating embodiments in which the power control table shown in FIG. 17 is generated.

As shown in Fig. 18, the power control table can be generated by at least one of S1801 to S1805, but the scope of the present invention is not limited thereto.

The power control table may be stored in the wireless power transmitter in the manufacturing process of the wireless power receiver or in the software (e.g., firmware) update process (S1801).

A new experimental value obtained every time when the power control table is connected to the wireless power receiver, wherein the experimental value includes receiver device information and receiver position information used for updating the power control table in step S1711 of Fig. 17, (S1803). ≪ / RTI >

In addition, when the wireless power receiver is connected to the wireless power transmitter, the wireless power receiver may transmit a power control table with its own receiver device information to the wireless power transmitter to which the appropriate initial power supply per receiver position information is mapped (S1805) . The power control table may be obtained from an extra packet transmitted by the wireless power receiver to the wireless power transmitter, such as for identification and configuration of the wireless power receiver, for negotiation, or for power transmission.

When the wireless power transmitter complies with the WPC standard, the wireless power receiver may transmit the power control table to the proprietary packet transmitted in the identification and configuration step or the power transmission step.

19 is a diagram showing an embodiment of a power control table.

As shown in FIG. 19, the receiver device information, the receiver position information, and the initial power supply may be mapped to each other in the power control table.

That is, the receiver device information may include a manufacturer code, a device identifier, a power class, and a maximum power.

When the wireless power transmitter complies with the WPC standard, the manufacturer information and basic device identification information transmitted in the identification and configuration step 430 correspond respectively to the manufacturer code and device identifier in FIG. 19 and transmitted in the power transmission step 440 The power class and the maximum power may correspond to the power class and the maximum power in Fig. 19, respectively.

The receiver position information is information about the position of the wireless power receiver on the rechargeable area of the wireless power transmitter. The receiver position information may be represented by a scalar value indicating a relative distance, but the scope of the present invention is not limited to this, and may be expressed by, for example, two-dimensional coordinates.

The receiver position information may be determined by the signal reception sensitivity generated by the wireless power receiver. If the wireless power transmitter complies with the WPC standard, the wireless power transmitter may calculate the receiver position information using the signal strength value received in the ping step 420. [

For example, signal strength values range from a minimum of 0 to a maximum of 255, the lower the signal strength value, the lower the reception efficiency of the wireless power receiver, and the lower the reception efficiency, the longer the relative distance between the wireless power transmitter and the wireless power receiver can do. Accordingly, the wireless power transmitter can calculate the signal strength values of 0 to 255 by converting them into the receiver position information of 255 to 0, respectively. The relative distance may be a value expressed by increasing the distance as the reception efficiency is lower, assuming that the position of the wireless power transmitter with the highest reception efficiency on the chargeable area of the wireless power transmitter is zero.

The receiver position information may be determined by information sensed by a separate sensor included in the wireless power transmitter. For example, a wireless power transmitter can sense the position of a wireless power receiver on a rechargeable area of a wireless power transmitter using a pressure sensor or a distance sensor included in the wireless power transmitter, It is possible to calculate the receiver position information using the table mapped.

20 is a flow chart showing in more detail the step of determining the initial supply power shown in Fig. As shown in FIG. 20, step S1705 may include steps S2001 to S2005 of FIG.

The wireless power transmitter may retrieve at least one initial power supply corresponding to the receiver device information closest to the first receiver device information in the power control table based on the collected first receiver device information (S2001).

As described above, the wireless power transmitter can retrieve at least one initial power supply closest to the first receiver device information in the power control table, wherein at least the first receiver device information corresponding to the receiver device information closest to the first receiver device information The method of retrieving one initial power supply may be implemented in various embodiments.

For example, if there is an initial power supply of the power control table that matches both the first receiver device information and the manufacturer code, device identifier, power class, and maximum power on the power control table, At least one initial supply power closest to the device information can be determined.

If there is no initial power supply of the power control table with the first receiver device information and the maker code, device identifier, power class, and maximum power on the power table match, then the wireless power transmitter will send the manufacturer code, device identifier, And the maximum number of pieces of information corresponding to the maximum power can be determined as the initial supply power closest to the first receiver device information.

According to another embodiment, the wireless power transmitter may prioritize the manufacturer code, the device identifier, the power rating, and the maximum power to retrieve sequentially matching information according to priority.

According to another embodiment, at least one initial supply power closest to the first receiver device information may be obtained by comparing the results obtained by digitizing the degree of proximity of the maker code, the device identifier, the power rating, Can be determined. For example, when a manufacturer code or a device identifier is the same, a value of 1 is assigned, and a value of 0 is assigned. When the power class or the maximum power is the same, a value of 0 or more and 1 or less is added . Here, the maximum value to be quantified can be treated differently by weighting each information.

The wireless power transmitter can select an initial power supply corresponding to the receiver position information closest to the first receiver position information in the power control table among the at least one initial power supplied (S2003). That is, when there is a plurality of initial power supply closest to the first receiver device information in the power control table, the wireless power transmitter can select the initial power supply corresponding to the receiver position information closest to the collected first receiver position information have. Conversely, if there is one initial power supply closest to the first receiver device information in the power control table, step S2003 may be omitted.

If the receiver position information is a relative distance represented by a scalar, then the initial power supply power closest to the collected first receiver position information is the initial power supply power of the initial power supply that is the smallest difference between the collected first receiver position information and the corresponding receiver position information of the initial power supply. Power can be determined.

The wireless power transmitter may determine the first initial power supply by correcting the selected initial power supply using the first receiver position information (S2005). That is, the wireless power transmitter may correct the selected initial power supply using the difference between the receiver position information corresponding to the selected initial power supply and the collected first receiver position information. For example, if the receiver position information corresponding to the selected initial power supply is smaller than the collected first receiver position information, it is necessary to correct the initial power supply to a higher level since the current wireless power receiver is relatively low in reception efficiency have. On the other hand, if the receiver position information corresponding to the selected initial power supply is larger than the collected first receiver position information, it is necessary to correct the initial power supply to a lower level since the current wireless power receiver is relatively high in reception efficiency.

Hereinafter, the first receiver device information collected by the wireless power transmitter includes the manufacturer code of A1, the device identifier of B2, the power rating of C1, and the maximum power of D3, and the first receiver position information collected by the wireless power transmitter X0. ≪ / RTI > It is also assumed that the initial power supply is selected in the power control table shown in Fig.

When the wireless power transmitter searches for the at least one initial power supply closest to the collected first receiver device information, the initial power supply of sequence number 2 and sequence number 4, in which the receiver device information all match, can be retrieved.

The first receiver position information X0 collected from the initial supply powers of the retrieved order numbers 2 and 4 is 100, the receiver position information X2 corresponding to the initial supply power of the order 2 is 50, and the initial supply power of the order 4 If the corresponding receiver position information X4 is 200, the initial supply power closest to the collected first receiver position information may be selected as the initial supply power P2 of order 2.

Finally, the wireless power transmitter may perform a correction to increase P2 by a value corresponding to 50 using a difference of 50 between the receiver position information X2 corresponding to the selected initial power supply P2 and the collected first receiver position information X0 . Accordingly, the corrected initial supply power P2 'can be determined as the final first initial supply power.

Then, the initial supply power P2 'corresponding to the manufacturer code of A1 corresponding to the wireless power receiver, the device identifier of B2, the power rating of C1, the maximum power of D3, and the receiver position information of X0 are mapped to each other Can be newly updated in the control table. This allows the initial power supply to be supplied to the wireless power receiver more quickly and accurately when the corresponding wireless power receiver is later connected to the wireless power transmitter.

FIG. 21 is a block diagram showing a control unit for performing the power control method described in FIGS. 17 to 20. FIG.

The controller 2100 shown in FIG. 21 can perform each step shown in FIG. 17, and the controller 2100 can be implemented as a part of the controller 840 in a wireless charging transmitter conforming to the WPC standard. The scope is not limited thereto. In addition, each of the components 2101 to 2109 of the control unit 2100 may be implemented by hardware, software, or a combination thereof.

The control unit 2100 may include a power control table storage unit 2101, a receiver information collection unit 2103, an initial power supply determination unit 2105, a power offset determination unit 2107, and a power control unit 2109 .

The power control table storage unit 2101 may store the power control table described above. The information included in the power control table may be received from the receiver information collection unit 2103 or the initial power supply unit 2105 and stored. The power control table storage unit 2101 may store a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, an SD or XD memory A static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM) A magnetic disk, a magnetic disk, an optical disk, or the like.

The receiver information collecting unit 2103 can collect the receiver device information and the receiver position information and supplies the collected information to the power control table storing unit 2101, the initial power supply determining unit 2105, the power offset determining unit 2107, Or the like. The receiver information collecting unit 2103 receives the receiver device information and the power control table corresponding to the wireless power receiver from the communication unit 830 and receives the information necessary for calculating the receiver position information from the sensing unit 850. [

The initial supply power determining unit 2105 may determine the initial supply power according to the receiver device information and the receiver position information from the power control table and provide the finally determined initial supply power to the power control unit 2109. [

The power offset determining unit 2107 may determine the power offset according to the receiver device information and provide the determined power offset to the power control unit 2109. [

The power control unit 2109 may receive the initial supply power and the power offset from the initial supply power determination unit 2105 and the power offset determination unit 2107 and may control the power conversion unit 810 to transmit power to the wireless power receiver .

22 is a graph comparing a conventional power control algorithm and a power control algorithm according to an embodiment of the present invention.

As shown in FIG. 22, the abscissa of the graph means time, and the ordinate of the graph means the power supply of the wireless power transmitter. According to the conventional power control algorithm, a constant initial power is set regardless of the characteristics of the wireless power receiver, and a control error value 1601 (when the wireless power receiver meets the WPC standard) transmitted from the wireless power receiver is received The power offset for determining the next power supply is also set to a constant power offset regardless of the characteristics of the wireless power receiver.

Also, it is common that the initial power and power offset are set as low as possible to prevent over-power reception of the wireless power receiver. Therefore, as shown in FIG. 22, the difference between the initial supply power and the demanded power becomes large, and as the power offset is set small, the power change amounts? P1 and? P2 per unit time become small, The time t1 until reaching is relatively long.

However, according to the power control method according to the embodiment of the present invention shown in FIG. 17, the receiver device information on the inherent characteristics of the wireless power receiver and the receiver position information according to the relative position between the wireless power receiver and the wireless power transmitter It is possible to determine the initial supply power as close as possible to the required power.

In addition, it is possible to determine the power offset in consideration of the receiver device information, and to prevent the over-power reception of the wireless power receiver, while reducing the magnitude of the power offset over time (e.g.,? P3? The time t2 until the power supply of the wireless power transmitter reaches the required power can be relatively shortened.

Although the power control method according to an exemplary embodiment of the present invention is applied to a wireless power transmitter conforming to the WPC standard, the scope of the present invention is not limited thereto. It will be appreciated that substantially the same technical idea may be applied to the wireless power transmitter through the same or similar information used in the power control method.

The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (17)

A wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus,
A power control table for storing a power control table in which receiver device information on the characteristics of the wireless power receiving apparatus and receiver position information on the position of the wireless power receiving apparatus on the charging area of the wireless power transmitting apparatus are mapped with initial power supply; Table storage;
An initial power determination unit for determining a first initial power supply using the power control table based on first receiver device information and first receiver position information;
A power offset determining unit for determining a power offset according to the first receiver device information; And
And a power control unit that controls power to be transmitted to a currently connected wireless power receiving apparatus according to the first initial power supply and the power offset. The method according to claim 1,
The power control table may be stored at the time of manufacture of the wireless power transmission apparatus or at the time of software update,
The wireless power receiving apparatus is stored every time the wireless power receiving apparatus is connected,
And receiving the table corresponding to the wireless power receiving apparatus. The method according to claim 1,
The initial supply power determining unit may determine,
Retrieving at least one initial power supply corresponding to receiver device information closest to the first receiver device information,
Selecting an initial supply power corresponding to receiver position information closest to the first receiver position information among the searched at least one initial supply power,
And corrects the selected initial power supply using the first receiver position information to determine the first initial power supply. The method of claim 3,
The initial supply power determining unit may determine,
And searches for at least one initial power supply corresponding to the largest number of pieces of receiver device information having the same information as the information included in the first receiver device information and the corresponding information on the power control table. The method according to claim 1,
Wherein the first receiver device information comprises at least one of a manufacturer code, a device identifier, a power rating, and a maximum power. The method according to claim 1,
Wherein the first receiver position information is calculated based on signal receiving sensitivity of the wireless power receiving apparatus or information sensed by a separate sensor. The method according to claim 1,
Wherein the magnitude of the power offset gradually decreases with time. The method according to claim 1,
Wherein the first receiver device information and the first receiver position information are mapped to the first initial power supply and updated in the power control table. A power control method of a wireless power transmission apparatus for wirelessly transmitting power to a wireless power receiving apparatus,
Storing a power control table in which receiver device information on characteristics of the wireless power receiving apparatus and receiver position information on a position of the wireless power receiving apparatus on a charging area of the wireless power transmitting apparatus are mapped with initial power supply;
Determining a first initial power supply using the power control table based on first receiver device information and first receiver position information;
Determining a power offset in accordance with the first receiver device information; And
And controlling power to be transmitted to a currently connected wireless power receiving apparatus in accordance with the first initial power supply and the power offset. 10. The method of claim 9,
The power control table may be stored at the time of manufacture of the wireless power transmission apparatus or at the time of software update,
The wireless power receiving apparatus is stored every time the wireless power receiving apparatus is connected,
And receiving the table corresponding to the wireless power receiving apparatus. 10. The method of claim 9,
Wherein the determining the first initial power supply comprises:
Retrieving at least one initial power supply corresponding to receiver device information closest to the first receiver device information;
Selecting an initial supply power corresponding to receiver position information closest to the first receiver position information among the retrieved at least one initial supply power; And
And correcting the selected initial power supply using the first receiver position information to determine the first initial power supply. 12. The method of claim 11,
Wherein the step of retrieving the at least one initial power supply comprises:
And searching for at least one initial power supply corresponding to the most receiver device information having the same information as the information contained in the first receiver device information and corresponding information on the power control table. 10. The method of claim 9,
Wherein the first receiver device information comprises at least one of a manufacturer code, a device identifier, a power rating, and a maximum power. 10. The method of claim 9,
Wherein the first receiver position information is calculated based on signal receiving sensitivity of the wireless power receiving apparatus or information sensed by a separate sensor. 10. The method of claim 9,
Wherein the magnitude of the power offset gradually decreases with time. 10. The method of claim 9,
Wherein the first receiver device information and the first receiver position information are mapped to the first initial power supply and updated in the power control table. A computer-readable recording medium on which a program for executing the method according to any one of claims 9 to 16 is recorded.

Images