KR20160119992A

KR20160119992A - Method for wireless power transmission and apparatus therefor

Info

Publication number: KR20160119992A
Application number: KR1020150048869A
Authority: KR
Inventors: 이종헌; 박수빈; 박수영
Original assignee: 엘지이노텍 주식회사
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2016-10-17
Also published as: WO2016163699A1; KR101773092B1

Abstract

The present invention provides a wireless power transmission method and an apparatus therefor. According to an embodiment of the present invention, the wireless power transmission method in the wireless power transmission apparatus includes the steps of: detecting a wireless power reception apparatus; identifying the wireless power transmission method supported by the detected wireless power reception apparatus; and performing wireless charging by the identified wireless power transmission method. Therefore, the present invention can maximize charging efficiency between the wireless power transmission apparatus supporting a plurality of wireless power transmission methods and the wireless power reception apparatus.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission method,

The present invention relates to a wireless power transmission technique, and more particularly, to a wireless power transmission method in a wireless power transmitter supporting a plurality of wireless power transmission schemes and an apparatus therefor.

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 Thereafter, a method of transmitting electric energy by radiating an electromagnetic wave such as a radio wave or a laser was tried. 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.

However, conventionally, a wireless power transmission method supporting a plurality of wireless charging schemes has not been provided.

It is an object of the present invention to provide a wireless power transmission method in a wireless power transmission apparatus supporting multi-mode and an apparatus therefor.

It is another object of the present invention to provide a multimode wireless power transmission method capable of improving power transmission efficiency and an apparatus therefor.

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 multimode wireless power transmission method and an apparatus therefor.

The wireless power transmission method in a wireless power transmission apparatus according to an embodiment of the present invention includes sensing a wireless power reception apparatus, identifying a wireless power transmission scheme supported by the sensed wireless power reception apparatus, And performing wireless charging with the wireless power transmission method.

Also, it is possible to detect the wireless power receiving apparatus by cross-transmitting the first through n-th signals corresponding to the first through the n-th wireless power transmission systems at predetermined intervals.

Also, the wireless power transmission method supported by the wireless power receiving apparatus can be identified based on the response signals corresponding to the first to n-th ping signals.

The method may further include measuring power transmission efficiency for each of the wireless power transmission schemes if the plurality of supported wireless power transmission schemes are identified.

Here, the power transmission efficiency may be measured based on the transmission power intensity measured at the time when power control is stabilized during power transmission for each wireless power transmission scheme.

In addition, the wireless charging can be performed with a wireless power transmission scheme having the lowest transmission power.

In addition, the wireless power transmission method may include at least one of an electromagnetic induction method defined in the WPC standard and an electromagnetic induction method defined in the PMA standard.

Another embodiment of the present invention can provide a computer-readable recording medium having recorded thereon a program for executing any one of the wireless power transmission methods.

The apparatus for transmitting wireless power according to another embodiment of the present invention includes means for sensing a wireless power receiving apparatus, means for identifying a wireless power transmission scheme supported by the sensed wireless power receiving apparatus, And means for performing wireless charging in a power transmission scheme.

The apparatus may further include means for measuring a power transmission efficiency for each of the wireless power transmission schemes if the plurality of supported wireless power transmission schemes are identified.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And can be understood and understood.

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

The present invention has the advantage of providing a multimode wireless power transmission method and apparatus and system therefor.

Further, the present invention has an advantage of providing a multimode wireless power transmission method capable of improving power transmission efficiency, and an apparatus and system therefor.

In addition, the present invention has an advantage of enabling high-efficiency wireless charging by comparing the charging efficiency of each wireless charging method through out-of-band communication and adaptively selecting an optimal wireless charging method based on the comparison.

In addition, the wireless power transmission apparatus supporting a plurality of wireless power transmission schemes according to the present invention has an advantage that the charging time can be minimized by maintaining the optimal charging efficiency.

In addition, the wireless power transmission apparatus according to the present invention has an advantage that power waste can be minimized by always maintaining the optimum charging efficiency.

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

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a diagram for explaining a wireless power transmission system according to an embodiment of the present invention.
2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard;
4 is a block diagram illustrating an internal structure of a wireless power transmission apparatus according to an embodiment of the present invention.
5 is a flowchart illustrating a method of transmitting a wireless power in a wireless power transmission apparatus according to an embodiment of the present invention.
6 is a diagram for explaining a wireless power transmission method in a wireless power transmission apparatus supporting dual mode according to an embodiment of the present invention.
7 is a diagram for explaining a method of transmitting a wireless power in a wireless power transmission apparatus supporting dual mode according to another embodiment of the present invention.
8 is a diagram for explaining a wireless power transmission method in a wireless power transmission apparatus supporting dual mode according to another 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 for transmitting wireless power on a wireless power system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmission device, a wireless power transmitter, and the like are used in combination. Also, 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 receiving apparatus, Etc. may 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, But it is not limited thereto, and it is sufficient if the wireless power receiving means according to the present invention is installed to charge the battery.

1 is a diagram for explaining a wireless power transmission system according to an embodiment of the present invention.

Referring to FIG. 1, a wireless power transmission system according to an embodiment may include a power source 100, a wireless power transmission device 200, a wireless power reception device 300, and an access terminal 400.

In an embodiment, the power source 100 may be included in the wireless power transmission device 200, but is not limited thereto.

In particular, the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 according to an embodiment may include a plurality of wireless power transmission means.

In addition, the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 according to an embodiment may exchange control signals or information through in-band communication. Here, the in-band communication can be performed by a pulse width modulation (PWM) method. For example, the wireless power receiving apparatus 300 switches various types of control signals and information to the wireless power transmission apparatus 200 by generating a feedback signal by switching on / off the current induced through the reception coil in a predetermined pattern Lt; / RTI >

For example, in the case of the WPC standard, the information transmitted by the wireless power receiving apparatus 300 may include received power intensity information. At this time, the wireless power transmission apparatus 200 can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.

However, in the case of PMA, which is another standard supporting the electromagnetic induction method, the wireless power transmission apparatus 200 can not confirm the received power intensity at the receiving end. Therefore, in the PMA scheme, the wireless power transmission apparatus 200 can not calculate the charging efficiency based on the feedback information received from the wireless power reception apparatus 300. [

Hereinafter, the wireless power transmission procedure defined in the WPC and PMA standards supporting the electromagnetic induction method will be described with reference to FIGS. 2 to 3, which will be described later.

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

Referring to FIG. 2, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 210, a ping phase 220, an identification and configuration phase 230, And a power transfer phase (240).

The selection step 210 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 210, 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 ping step 220. [ In the selection step 210, the transmitter transmits an analog ping 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 220, the transmitter transmits a digital ping when an object is detected. If the sender does not receive a response signal for the digital ping from the receiver in step 220, then it may transition to a selection step 210. Also, at the step 220, the transmitter may transition to the selection step 210 upon receiving a signal indicating that power transmission is complete from the receiver, i.e., a charging completion signal.

Once the ping step 220 is complete, the transmitter may transition to an identification and configuration step 230 for collecting receiver identification and receiver configuration and status information.

In the identifying and configuring step 230, the transmitter determines whether a packet is received or unexpected, a desired packet is not received for a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract) to the selection step 210. If the " no power transfer contract "

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

In a power transfer step 240, the sender may send an unexpected packet, a desired packet is not received for a predefined time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 210 can be performed.

Also, in power transfer step 240, the transmitter may transition to the Identify and Configure step 230 if it is necessary to reconfigure the power transfer contract based on transmitter state changes and so on.

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.

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

Referring to FIG. 3, the power transmission from the transmitter to the receiver according to the PMA standard is largely divided into a standby phase 310, a digital ping phase 320, an identification phase 330, And a Power Transfer Phase (340).

The waiting step 310 may be a step of performing a receiver identification procedure for power transmission or a transition if a specific error or a specific event is detected while maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at the standby step 310, 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, Here, RXID is a unique identifier assigned to a PMA compatible receiver. In the wait step 310, the transmitter transmits an analog ping 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.

The transmitter transited to the digital ping stage 320 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.

At step 320, the receiver may transition to an identification step 330 if a valid response signal is received.

If the response signal is not received or it is determined that it is not a PMA compatible receiver, i.e., it is a Foreign Object Detection (FOD), at step 310, the transmitter may transition to the wait step 310 . As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 330, the transmitter may transition to the waiting step 310 if the receiver identification procedure fails or the receiver identification procedure must be re-performed and the receiver identification procedure is not completed for a predefined period of time.

If the transmitter succeeds in identifying the receiver, the transmitter can transition to power transfer step 340 in the identifying step 330 and initiate charging.

In the power transfer step 340, 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, You can transit.

Also, in the power transfer step 340, the transmitter can transition to the charge completion step 350 if the temperature sensed by the internally provided temperature sensor exceeds the reference value or the charge is completed.

In the charge complete step 350, the transmitter can transition to the wait state 310 if it is confirmed that the receiver has been removed from the charging surface.

Also, if the measured temperature drops below the reference value after a predetermined time elapses in the Over Temperature state, the transmitter can transition from the charging completion step 350 to the digital charging step 320.

In the digital zipping step 350 or the power transfer step 340, the transmitter may transition to the charge completion step 350 when an End Of Charge (EOC) request is received from the receiver.

4 is a block diagram illustrating an internal structure of a wireless power transmission apparatus according to an embodiment of the present invention.

4, the wireless power transmission apparatus 400 includes a first inductive power transmission unit 410, a second inductive power transmission unit 420, a transmission power calculation unit 430, a communication unit 440, and a controller 450 ). &Lt; / RTI >

The first inductive power transfer unit 410 may perform a ping signal transfer based on the WPC standard - hereinafter simply referred to as WPC ping - and wireless power transfer.

The second inductive power transfer unit 420 may perform a ping signal transfer based on the PMA standard - hereinafter simply referred to as PMA ping - and a wireless power transfer.

The transmission power calculator 420 calculates the transmission power of the first induction power transmission unit 410 and / or the second induction power transmission unit (or the second induction power transmission unit) 420 when the transmission power is stabilized in accordance with the power control through the in- 420 may measure the intensity of the power applied to the transmission coil of the second antenna. For example, whether or not the outgoing radio power is stabilized can be determined to be stabilized when the intensity change of the outgoing radio power is equal to or less than a predetermined reference value. As another example, it may be determined that the transmission radio power is stabilized if the power control is performed within a predetermined range set in advance for a predetermined time.

The communication unit 440 may perform a function of transmitting or receiving specific control signals and status information through in-band.

The control unit 450 can control the overall operation of the wireless power transmission apparatus 400. [

In accordance with the present invention, the controller 450 may control the transmission timing of WPC and PMA ping to identify the wireless power transmission technique supported by the wireless power receiving apparatus.

In order to confirm a wireless power transmission technique that can be supported by the wireless power receiving apparatus, the controller 450 controls the first and second induced power transmitting units 410 and 410 so that the PMA and WPC pinges can be transmitted at predetermined intervals, The operation of the power transmitting unit 420 can be controlled.

In addition, when the wireless power transmission technique supported by the wireless power receiving apparatus is identified, the controller 450 controls the first inductive power transmitting unit 410 and / or the second inductive power transmitting unit 420 according to the identification result The wireless power can be controlled to be transmitted. For example, if the detected wireless power receiving apparatus is a PMA compliant terminal and is identified as not a WPC compatible terminal, the controller 450 may control the wireless power to be transmitted through the second inductive power transmitting unit 420.

Also, if the detected wireless power receiving apparatus is identified as a WPC compatible terminal and not a PMA compatible terminal, the controller 450 may control the wireless power to be transmitted through the first induced power transmitting unit 410. [

In particular, if the detected wireless power receiving device is not only a PMA compliant terminal but also a WPC compatible terminal, i.e., a dual mode terminal, the controller 450 controls the first induced power transmitter 410 according to a predefined order, And the second inductive power transmission unit 420 may be sequentially activated to transmit the wireless power.

For example, if it is determined that the detected wireless power receiving apparatus is a dual mode terminal, the control unit 420 activates the first induced power transmitting unit 410 to perform a ping step 220, an identification and configuration step 230, The transmission power calculation unit 430 controls the transmission coil 240 to be sequentially operated and the transmission power calculation unit 430 applies the transmission power to the transmission coil of the first induction power transmission unit 410 at the time when the power control is stabilized during the power transmission step 240 It is possible to control the intensity of the power to be measured. For convenience of explanation, the transmitted power intensity of the first inductive power transmission unit 410 measured at the stabilization time of the power control will be referred to as a first transmission power strength.

The control unit 450 activates the second inductive power transfer unit 420 to control the digital zipping step 320, the identification step 330 and the power transmission step 340 to be sequentially performed, The transmission power calculation unit 430 may control the power of the transmission coil of the second inductive power transmission unit 420 to be measured. For convenience of explanation, it will be assumed that the transmission power intensity of the second inductive power transmission unit 420 measured at the stabilization time of the power control is referred to as a second transmission power strength.

Thereafter, the controller 450 compares the first sending power intensity with the second sending power strength, and controls the wireless power receiving apparatus to transmit the wireless power to the wireless power receiving apparatus through an inductive power transmitting unit corresponding to a smaller value.

That is, the controller 450 can control the wireless power to be transmitted through a wireless power transmission scheme that transmits less power in order to maintain the same charging efficiency among a plurality of wireless power transmission methods. Thus, the power consumption of the wireless power transmission apparatus 400 can be minimized.

In the above-described embodiment, in the case of a dual-mode terminal, the controller 450 is described as being activated in order of the first inductive power transfer unit 410 and the second inductive power transfer unit 420 to control the transmission power intensity to be measured However, this is only one embodiment, and another embodiment of the present invention activates the second inductive power transmission unit 420 and the first inductive power transmission unit 410 in order, and controls the transmission power intensity to be measured It is possible.

5 is a flowchart illustrating a method of transmitting a wireless power in a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the wireless power transmission apparatus can transmit PMA and WPC at an interval by a predetermined time interval (S501).

The wireless power transmitting apparatus can identify the electromagnetic induction method supported by the wireless power receiving apparatus (S503).

As a result of the identification, in the dual mode, the wireless power transmission apparatus can start the charging by performing the wireless power transmission procedure in the WPC scheme (S507).

The wireless power transmission apparatus can confirm whether or not the power control is stabilized in the power transmission step 240 (S509).

As a result, if the power control is stabilized, the wireless power transmission apparatus can measure the transmission power intensity a for the WPC scheme (S511).

Thereafter, the wireless power transmission apparatus can start the charging by deactivating the WPC wireless power transmission, activating the PMA wireless power transmission, and performing the wireless power transmission procedure in the PMA manner (S513 to S515).

The wireless power transmission apparatus can confirm whether or not the power control is stabilized in the power transmission step 340 (S517).

As a result of checking, if the power control is stabilized, the wireless power transmission apparatus can measure the transmitted power intensity b for the PMA scheme (S519).

The wireless power transmission apparatus can compare the transmission power intensity a for the WPC scheme with the transmission power intensity b for the PMA scheme at step S512.

As a result of the comparison, if the transmission power intensity (a) for the WPC scheme is smaller than the transmission power strength (b) for the PMA scheme, the wireless power transmission apparatus deactivates the activated PMA scheme and performs wireless power transmission in the WPC scheme (S523).

If it is determined in step 512 that the transmission power intensity a for the WPC scheme is greater than the transmission power strength b for the PMA scheme, the wireless power transmission apparatus transmits the wireless power using the already activated PMA scheme (S525).

As a result of the determination in step 505, if it is not a dual mode, it is possible to confirm whether the electromagnetic induction method that can be supported by the wireless power transmission apparatus is the WPC scheme (S527).

As a result, if the wireless power receiving apparatus supports only the WPC method, the wireless power transmitting apparatus can perform the wireless power transmission by the WPC method. On the other hand, if the wireless power receiving apparatus supports only the PMA scheme, the wireless power transmission apparatus can perform wireless power transmission in the PMA scheme.

6 is a diagram for explaining a wireless power transmission method in a wireless power transmission apparatus supporting dual mode according to an embodiment of the present invention.

Referring to FIG. 6, the wireless power transmission apparatus can cross-transmit WPC and PMA at predetermined intervals. During the cross transmission, if it is determined that the detected wireless power receiving apparatus supports only the WPC scheme, the wireless power transmission apparatus can disable the PMA scheme and perform the wireless power transmission control using the WPC scheme. At this time, the wireless power transmission apparatus can perform the wireless power transmission control by sequentially performing the WPCing step 220, the identification and configuration step 230, and the power transmission step 240, as shown in FIG. 6 .

7 is a diagram for explaining a method of transmitting a wireless power in a wireless power transmission apparatus supporting dual mode according to another embodiment of the present invention.

Referring to FIG. 7, the wireless power transmission apparatus may cross-transmit WPC and PMA ping at regular intervals. During the cross transmission, if it is determined that the detected wireless power receiving apparatus supports only the PMA scheme, the wireless power transmission apparatus can disable the WPC scheme and perform wireless power transmission control using the PMA scheme. At this time, the wireless power transmission apparatus can perform wireless power transmission control by sequentially performing the PMAX step 320, the identification step 330, and the power transmission step 340.

8 is a diagram for explaining a wireless power transmission method in a wireless power transmission apparatus supporting dual mode according to another embodiment of the present invention.

Referring to FIG. 8, the wireless power transmission apparatus can cross-transmit ping and PMA ping at regular intervals.

During the cross transmission, if it is determined that the detected wireless power receiving apparatus is a dual mode wireless power receiving apparatus supporting both the WPC scheme and the PMA scheme, the wireless power transmission apparatus deactivates the PMA scheme and controls wireless power transmission in the WPC scheme It is possible to measure the transmitted power intensity (a) for the WPC scheme at the stabilization time of the power control.

Subsequently, the wireless power transmission apparatus deactivates the WPC scheme and controls the wireless power transmission by the PMA scheme, thereby measuring the transmitted power intensity b for the PMA scheme at the stabilization time of the power control.

Thereafter, the wireless power transmission apparatus compares the WPC transmission power intensity (a) with the PMA transmission power strength (b) to determine a wireless power transmission scheme having a good power transmission efficiency, So that the charging to the device can be performed. Here, the wireless power transmission apparatus can determine that the wireless power transmission scheme capable of transmitting less wireless power in order to maintain the same charging efficiency is good in power transmission efficiency.

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.

100: Power source
200: Wireless power transmitting device
300: Wireless power receiving device
410: first induction power transfer section
420: second induction power transfer section
430: transmission power calculation unit
440:
450:

Claims

A wireless power transmission method in a wireless power transmission apparatus,
Sensing a wireless power receiving device;
Identifying a wireless power transmission scheme supported by the sensed wireless power reception device; And
Performing wireless charging with the identified wireless power transmission scheme
/ RTI >

The method according to claim 1,
Wherein the wireless power receiving apparatus senses the wireless power receiving apparatus by cross-transmitting first to n-th ping signals corresponding to the first to n-th wireless power transmission systems at predetermined intervals.

3. The method of claim 2,
And identifies the wireless power transmission scheme supported by the wireless power reception device based on a response signal corresponding to the first through the n-th ping signals.

The method according to claim 1,
Further comprising measuring power transmission efficiency for each of the wireless power transmission schemes if the plurality of supported wireless power transmission schemes are identified.

5. The method of claim 4,
Wherein the power transmission efficiency is measured based on a transmission power intensity measured at a time when power control is stabilized during power transmission for each wireless power transmission scheme.

6. The method of claim 5,
And performs the wireless charging in a wireless power transmission scheme in which the transmission power intensity is the smallest.

The method according to claim 1,
Wherein the wireless power transmission scheme comprises at least one of an electromagnetic induction scheme defined in the WPC standard and an electromagnetic induction scheme defined in the PMA standard.

A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 to 7.

An apparatus for transmitting wireless power,
Means for sensing a wireless power receiving device;
Means for identifying a wireless power transmission scheme supported by the sensed wireless power receiving device; And
Means for performing wireless charging with the identified wireless power transmission scheme
And a radio frequency generator.

10. The method of claim 9,
Wherein the wireless power receiving apparatus senses the wireless power receiving apparatus by cross-transmitting the first through the n-th ping signals corresponding to the first through n-th wireless power transmission systems at predetermined intervals.

11. The method of claim 10,
And identifies the wireless power transmission scheme supported by the wireless power receiving apparatus based on a response signal corresponding to the first through the n-th ping signals.

10. The method of claim 9,
And means for measuring power transmission efficiency for each of the wireless power transmission schemes if the plurality of supported wireless power transmission schemes are identified.

13. The method of claim 12,
Wherein the power transmission efficiency is measured based on a transmission power intensity measured at a time when power control is stabilized during power transmission for each wireless power transmission scheme.

14. The method of claim 13,
And performs the wireless charging with a wireless power transmission scheme in which the transmission power intensity is the smallest.

10. The method of claim 9,
Wherein the wireless power transmission scheme includes at least one of an electromagnetic induction method defined in the WPC standard and an electromagnetic induction method defined in the PMA standard.