WO2016072767A1

WO2016072767A1 - Wireless power transmitting device and method

Info

Publication number: WO2016072767A1
Application number: PCT/KR2015/011859
Authority: WO
Inventors: 박재희
Original assignee: 엘지이노텍 주식회사
Priority date: 2014-11-06
Filing date: 2015-11-05
Publication date: 2016-05-12

Abstract

The present invention relates to a wireless power transmitting device and method which are configured to: transmit a first state confirmation signal through a first transmitting method; transmit power through the first transmitting method when a first state response signal corresponding to the first state confirmation signal is received; and transmit a second state confirmation signal through a second transmitting method when the first state response signal is not received. According to the present invention, the wireless power transmitting device alternatingly uses the first transmitting method and the second transmitting method, and the existence of the wireless power transmitting device and the receiving method thereof can be detected.

Description

Wireless power transmission apparatus and method

The present invention relates to a wireless power charging system, and more particularly, to an apparatus and method for transmitting wireless power of a wireless power charging system.

Generally, various electronic devices have a battery and are driven by using the electric power charged in the battery. At this time, in the electronic device, the battery may be replaced and may be charged again. To this end, the electronic device has a contact terminal for contacting an external charging device. In other words, the electronic device is electrically connected to the charging device through the contact terminal. However, as the contact terminals are exposed to the outside in the electronic device, they may be contaminated by foreign matter or shorted by moisture. In this case, a poor contact occurs between the contact terminal and the charging device, so that the battery is not charged in the electronic device.

In order to solve the above problems, a wireless power charging system for wirelessly charging electronic devices has been proposed. The wireless power charging system includes a wireless power transmitter and a wireless power receiver. The wireless power transmitter transmits power wirelessly, and the wireless power receiver wirelessly receives power. Here, the electronic device may include a wireless power receiver, and may be electrically connected to the wireless power receiver. And in a wireless power charging system, various charging schemes exist. In this case, in order for power to be transferred from the wireless power transmitter to the wireless power receiver, the charging method of the wireless power transmitter and the charging method of the wireless power receiver should be the same.

Accordingly, the present invention provides an apparatus and method for wireless power transmission for efficiently transmitting power. The present invention also provides a wireless power transmission apparatus and method for transmitting power in accordance with a plurality of charging schemes.

In accordance with another aspect of the present invention, there is provided a wireless power transmission method including transmitting a first status confirmation signal in a first transmission method and receiving a first status response signal in response to the first status confirmation signal. And transmitting power in the first transmission scheme.

The wireless power transmission method according to the present invention further includes transmitting a second status confirmation signal by a second transmission method when the first status response signal is not received.

The wireless power transmission method according to the present invention may further include transmitting power in the second transmission method when a second status response signal is received in response to the second status confirmation signal.

In addition, the wireless power transmission method according to the present invention returns to the first status confirmation signal transmission process if the second status response signal is not received.

On the other hand, the wireless power transmission apparatus according to the present invention for solving the above problems, the first coil unit for the first transmission method, the second coil unit for the second transmission method, and the first coil through And a control unit for transmitting a first status check signal and transmitting power through the first coil unit when a first status response signal is received in response to the first status check signal.

In the wireless power transmitter according to the present invention, if the first status response signal is not received, the controller transmits a second status confirmation signal through the second coil unit.

In the wireless power transmitter according to the present invention, the control unit transmits power through the second coil unit when a second state response signal is received in response to the second state confirmation signal.

Furthermore, in the wireless power transmission apparatus according to the present invention, the control unit transmits the first state confirmation signal through the first coil unit when the second state response signal is not received.

The apparatus and method for transmitting power wirelessly according to the present invention can detect the existence and the receiving method of the wireless power receiver by using the first transmission method and the second transmission method alternately. Through this, the wireless power transmitter can effectively charge the wireless power receiver by using the first transmission method and the second transmission method. That is, the wireless power transmitter may transmit power according to a plurality of transmission schemes. Accordingly, the wireless power transmitter can efficiently transmit power in accordance with the reception method of the wireless power receiver.

1 is a block diagram showing a wireless power charging system to which the present invention is applied;

2A, 2B, 2C, 2D and 2E are circuit diagrams showing equivalent circuits of the wireless transmitter and the wireless receiver in FIG. 1,

3 is a block diagram showing a wireless power transmission apparatus according to an embodiment of the present invention;

4 is a graph for explaining operating characteristics of the first coil unit and the second coil unit in FIG. 3;

5 is a flowchart illustrating a wireless power transmission procedure according to an embodiment of the present invention;

6 is an exemplary view for explaining a wireless power transmission method according to an embodiment of the present invention.

7 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention.

8 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

9 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention.

10 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

11 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention.

12 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, the same components in the accompanying drawings should be noted that the same reference numerals as possible. And a detailed description of known functions and configurations that can blur the gist of the present invention will be omitted.

1 is a block diagram illustrating a wireless power charging system to which the present invention is applied. 2A, 2B, 2C, 2D, and 2E are circuit diagrams illustrating equivalent circuits of the wireless transmitter and the wireless receiver in FIG. 1.

Referring to FIG. 1, the wireless power charging system 10 to which the present invention is applied includes a wireless power transmitter 20 and a wireless power receiver 30.

The wireless power transmitter 20 is connected to the power source 11 and receives power from the power source 11. The wireless power transmitter 20 transmits power wirelessly. Here, the wireless power transmitter 20 may transmit AC power. At this time, the wireless power transmitter 20 transmits power according to a plurality of transmission schemes. Here, the transmission schemes include an electromagnetic induction scheme, a resonance scheme, and an RF / Micro Wave Radiation scheme. That is, at least two of the transmission schemes are preset in the wireless power transmitter 20. In addition, the wireless power transmitter 20 may select any one of preset transmission schemes and transmit power. The wireless power transmitter 20 includes a wireless transmitter 21.

The wireless power receiver 30 receives power wirelessly. Here, the wireless power receiver 30 may receive AC power. The wireless power receiver 30 may convert AC power into DC power. At this time, the wireless power receiver 30 receives power according to a preset reception scheme. Here, the reception method includes an electromagnetic induction method, a resonance method, and a propagation method. In addition, the wireless power receiver 30 may be driven using power. The wireless power receiver 30 includes a wireless receiver 31.

In this case, in order for the wireless power transmitter 20 to transmit power to the wireless power receiver 30, the wireless power receiver 30 must be disposed in a predetermined area of the wireless power transmitter 20. That is, the center of the wireless power transmitter 20 and the center of the wireless power receiver 30 must correspond to each other. In detail, the center of the wireless power transmitter 20 and the center of the wireless power receiver 30 should be arranged on the same line. In addition, in order for the wireless power transmitter 20 to transmit power to the wireless power receiver 30, any one of the transmission schemes of the wireless power transmitter 20 matches the reception scheme of the wireless power receiver 30. Should be.

For example, when the transmission method of the wireless power transmitter 20 and the reception method of the wireless power receiver 30 are electromagnetic induction methods, the wireless transmitter 21 and the wireless receiver 31 are as shown in FIG. 2A. Can be represented as: The wireless transmitter 21 may include a transmission induction coil 23. In this case, the transmission induction coil 23 may be represented by a transmission inductor L1. The wireless receiver 31 may include a reception induction coil 33. In this case, the reception induction coil 33 may be represented by a reception inductor L2. As a result, when the reception induction coil 33 is disposed to face the transmission induction coil 23, the transmission induction coil 23 may transmit power to the reception induction coil 33 in an electromagnetic induction manner.

On the other hand, when the transmission method of the wireless power transmitter 20 and the reception method of the wireless power receiver 30 are a resonance method, the wireless transmitter 21 and the wireless receiver 31 are shown in FIGS. 2B, 2C, 2D and As shown in FIG. 2E.

The wireless transmitter 21 may include a transmission induction coil 25 and a transmission resonance coil 26 as illustrated in FIGS. 2B and 2D. In this case, the transmission induction coil 25 and the transmission resonance coil 26 may be disposed to face each other. The transmission induction coil 25 may be represented by a first transmission inductor L11. In addition, the transmission resonance coil 26 may be represented by a second transmission inductor L12 and a transmission capacitor C1. Here, the second transmitting inductor L12 and the transmitting capacitor C1 may be connected in series to form a closed loop. Alternatively, the wireless transmitter 21 may include a transmission resonance coil 27 as illustrated in FIGS. 2C and 2E. In this case, the transmission resonance coil 27 may be represented by a transmission inductor L1 and a transmission capacitor C1. Here, the transmission inductor L1 and the transmission capacitor C1 may be connected in series with each other.

The wireless receiver 31 may include a reception resonance coil 35 and a reception induction coil 36 as illustrated in FIGS. 2B and 2E. In this case, the reception resonance coil 35 and the reception induction coil 36 may be disposed to face each other. In addition, the reception resonance coil 35 may be represented by a reception capacitor C2 and a first reception inductor L21. Here, the receiving capacitor C2 and the first receiving inductor L21 may be connected in series to form a closed loop. The reception induction coil 36 may be referred to as a second reception inductor L22. Alternatively, the wireless receiver 31 may include a reception resonance coil 37 as illustrated in FIGS. 2C and 2D. In this case, the reception resonance coil 37 may be represented by a reception inductor L2 and a reception capacitor C2. Here, the receiving inductor L2 and the receiving capacitor C2 may be connected in series with each other.

As a result, when the reception resonance coil 35 is disposed to face the transmission resonance coil 26, the transmission resonance coil 26 may transmit power to the reception resonance coil 35 in a resonance manner. At this time, the transmission induction coil 25 may transmit power to the transmission resonance coil 26 in an electromagnetic induction manner, and the transmission resonance coil 26 may transmit power to the reception resonance coil 35 in a resonance manner. Alternatively, the transmission resonance coil 26 may directly transmit power to the reception resonance coil 35 in a resonance manner. In addition, the reception resonance coil 35 may receive power from the transmission resonance coil 26 in a resonance manner, and the reception induction coil 36 may receive power from the reception resonance coil 35 in an electromagnetic induction manner. Alternatively, the reception resonance coil 35 may receive power from the transmission resonance coil 26 in a resonance manner.

3 is a block diagram illustrating a wireless power transmission apparatus according to an embodiment of the present invention. 4 is a graph for explaining operating characteristics of the first coil unit and the second coil unit in FIG. 3. 4 illustrates impedance characteristics according to frequency in the wireless power transmitter.

Referring to FIG. 3, the apparatus 100 for transmitting power wirelessly according to the present exemplary embodiment includes an interface unit 110, a first coil unit 120, a second coil unit 130, and a controller 140.

The interface unit 110 provides an interface with a power source 11 in FIG. 1 in the apparatus 100 for transmitting power wirelessly. In other words, the interface unit 110 is connected to the power source 11. Here, the interface unit 110 may be connected to the power source 11 by wire. The interface unit 110 receives power from the power source 11. Here, the interface unit 110 receives DC power from the power source 11.

The first coil unit 120 and the second coil unit 130 transmit power wirelessly from the wireless power transmitter 100. In this case, the first coil unit 120 and the second coil unit 130 transmit power according to a plurality of transmission schemes. Here, the transmission schemes include an electromagnetic induction scheme, a resonance scheme, and a radio wave radiation scheme. The first coil unit 120 is implemented in correspondence with the first transmission scheme, and the second coil unit 130 is implemented in correspondence with the second transmission scheme.

For example, either the first transmission method or the second transmission method may be implemented by an electromagnetic induction method, and the other may be implemented by a resonance method. Alternatively, the first transmission method and the second transmission method may be implemented by an electromagnetic induction method. However, the first transmission method and the second transmission method may have different resonance frequency bands. For example, as shown in FIG. 4, the first transmission scheme may have a first resonance frequency band fo1, and the second transmission scheme may have a second resonance frequency band fo2.

The first coil unit 120 and the second coil unit 130 includes an oscillator, a power converter, and at least one transmitting coil. The oscillator produces an alternating signal. At this time, the oscillator generates an AC signal corresponding to each transmission method. Here, the oscillator generates an alternating signal to have a predetermined frequency. The power converter converts power and provides the power to the transmission coil. At this time, the power converter receives the DC power from the interface unit 110, and receives an AC signal from the oscillator. The power converter generates AC power using DC power and AC signal. The power converter may amplify and use an AC signal. The power converter also outputs AC power to the transmitting coil. The power converter may have a push-pull type structure. A push pull type structure represents a structure in which switches, transistors, or arbitrary circuit blocks present in pairs operate alternately to output a response alternately. The transmission coil may include at least one of a transmission induction coil and a transmission resonance coil according to a transmission scheme.

The controller 140 controls the overall operation of the wireless power transmission apparatus 100. At this time, the control unit 140 operates the first coil unit 120 and the second coil unit 130 to transmit power wirelessly. To this end, the controller 140 operates the first coil unit 120 and the second coil unit 130 to determine the existence of the wireless power receiver (30 of FIG. 1). Herein, the controller 140 may alternately operate the first coil unit 120 and the second coil unit 130 to determine whether the wireless power receiver 30 exists. In this way, the controller 140 may detect not only the existence of the wireless power receiver 30 but also a reception method of the wireless power receiver 30. The controller 140 may select either the first coil unit 120 or the second coil unit 130 in response to the reception method of the wireless power receiver 30. In addition, when the wireless power receiver 30 exists, the controller 140 operates either the first coil unit 120 or the second coil unit 130 to transmit power.

5 is a flowchart illustrating a wireless power transmission procedure according to an embodiment of the present invention. 6 is an exemplary view for explaining a wireless power transmission method according to an embodiment of the present invention. 6A illustrates a case where power is transmitted through the first coil unit, and FIG. 6B illustrates a case where power is transmitted through the second coil unit.

Referring to FIG. 5, the wireless power transmission procedure of the present embodiment starts from the control unit 140 transmitting the first status confirmation signal 311 in step 211. At this time, the controller 140 controls the first coil unit 120 to transmit the first status confirmation signal 311. That is, the controller 140 generates the first status confirmation signal 311 in response to the first transmission method, and transmits the first status confirmation signal 311 through the transmission coil of the first coil unit 120. Here, the first status check signal 311 may be a ping signal. For example, as illustrated in FIGS. 6A and 6B, the controller 140 may transmit the first status confirmation signal 311 within a preset time interval t0. As illustrated in FIGS. 6A and 6B, the controller 140 may transmit the first status confirmation signal 311 and then wait for a preset time interval t1.

Next, when the first status response signal 313 is received in response to the first status confirmation signal 311, the controller 140 detects it in step 213. In this case, when the reception method of the wireless power receiver 30 (in FIG. 1) corresponds to the first transmission method, the wireless power receiver 30 may receive the first status check signal 311. The wireless power receiver 30 may transmit a first status response signal 313 in response to the first status confirmation signal 311. In this way, the first coil unit 120 may receive the first status response signal 313. In addition, when the first status response signal 313 is received through the first coil unit 120, the controller 140 may detect this. For example, as illustrated in (a) of FIG. 6, the wireless power receiver 30 may transmit the first status response signal 313 within a preset time interval t2.

In this case, the first status response signal 313 may include a preamble 314 and reception information 315. For example, as shown in FIG. 6A, the preamble 314 may be delivered at the front end portion of the corresponding time interval t2, and the reception information 315 may be continuously delivered to the preamble 314. have. Here, the preamble 314 may be formed of a binary string. In addition, the reception information 315 may include identification information and configuration information of the wireless power receiver 30. For example, the configuration information may include a reception method of the wireless power receiver 30. As a result, when the wireless power receiver 30 transmits the first status response signal 313, the controller 140 may preferentially detect the preamble 314 through the first coil unit 120. In addition, as shown in FIG. 6A, the controller 140 may receive the first status response signal 313 and then wait for a preset time interval t3.

Next, the controller 140 transmits the power 317 in step 215, and terminates the wireless power transmission procedure. At this time, the controller 140 controls the first coil unit 120 to transmit the power 317. That is, when the first status response signal 313 is received in response to the first status confirmation signal 311, the controller 140 detects the existence of the wireless power receiver 30. In detail, when the preamble 314 is detected in response to the first status confirmation signal 311, the controller 140 detects the existence of the wireless power receiver 30. In addition, the controller 140 detects a reception method of the wireless power receiver 30. In other words, the controller 140 determines that the reception method of the wireless power receiver 30 corresponds to the first transmission method. In this way, the control unit 140 converts the power 317 corresponding to the first transmission method, and transmits the power 317 through the first coil unit 120. For example, the controller 140 may transmit power 317, as shown in FIG. 6A.

If the first status response signal 313 is not received in step 213, the controller 140 transmits the second status check signal 321 in step 221. At this time, the controller 140 controls the second coil unit 130 to transmit a second status check signal 321. That is, the controller 140 generates a second status confirmation signal 321 in response to the second transmission method, and transmits the second status confirmation signal 321 through the transmission coil of the second coil unit 130. Here, the second status check signal 321 may be a ping signal. For example, as illustrated in FIG. 6B, the controller 140 may transmit the second status check signal 321 within a preset time interval t4. As illustrated in (b) of FIG. 6, the controller 140 may transmit the second status check signal 321 and then wait for a preset time interval t5.

Next, when the second status response signal 323 is received in response to the second status confirmation signal 321, the controller 140 detects this in step 223. In this case, when the reception method of the wireless power receiver 30 corresponds to the second transmission method, the wireless power receiver 30 may receive the second status check signal 321. The wireless power receiver 30 may transmit a second status response signal 323 in response to the second status confirmation signal 321. Through this, the second coil unit 130 may receive the second status response signal 323. In addition, when the second status response signal 323 is received through the second coil unit 130, the controller 140 may detect this. For example, as illustrated in (b) of FIG. 6, the wireless power receiver 30 may transmit the second status response signal 323 within a preset time interval t6.

In this case, the second status response signal 323 may include a preamble 324 and reception information 325. For example, as shown in FIG. 6B, the preamble 324 may be delivered at the front end in the corresponding time interval t6, and the reception information 325 may be continuously delivered to the preamble 324. have. Here, the preamble 324 may be formed of a binary string. In addition, the reception information 325 may include identification information and configuration information of the wireless power receiver 30. For example, the configuration information may include a reception method of the wireless power receiver 30. As a result, when the wireless power receiver 30 transmits the second status response signal 323, the controller 140 may preferentially detect the preamble 324 through the second coil unit 130. In addition, as shown in FIG. 6B, the controller 140 may receive the second status response signal 323 and then wait for a preset time interval t7.

Next, the controller 140 transmits the power 327 in step 225, and ends the wireless power transmission procedure. At this time, the controller 140 controls the second coil unit 130 to transmit the power 327. That is, when the second status response signal 323 is received in response to the second status confirmation signal 321, the controller 140 detects the existence of the wireless power receiver 30. In detail, when the preamble 324 is detected in response to the second status check signal 321, the controller 140 detects the existence of the wireless power receiver 30. In addition, the controller 140 detects a reception method of the wireless power receiver 30. In other words, the controller 140 determines that the reception method of the wireless power receiver 30 corresponds to the second transmission method. In this way, the control unit 140 converts the power 327 corresponding to the second transmission method, and transmits the power 327 through the second coil unit 130. For example, the controller 140 may transmit power 327 as illustrated in FIG. 6B.

If the second status response signal 323 is not received in step 223, the controller 140 returns to step 211. The controller 140 repeats at least some of steps 211 to 225.

7 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention. 8 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

Referring to FIG. 7, the wireless power transmission procedure of another embodiment starts from the control unit 140 transmitting a status check signal 511 in step 411. Here, the status check signal 511 may be a ping signal. For example, as illustrated in FIG. 8, the controller 140 may transmit a status check signal within a preset time interval t0. As illustrated in FIG. 8, the controller 140 may transmit a status check signal 511 and then wait for a preset time period t1.

Next, a response signal 513 corresponding to the status confirmation signal 511 may be received. In this case, the controller detects this in step 413. For example, as illustrated in FIG. 8, the response signal 513 may be received from the wireless power receiver 30 within a preset time interval t2.

The controller 140 may check the received response signal 513 and may determine whether a preamble is included in the response signal in step 415. For example, the response signal may include preamble and reception information or only reception information according to a transmission scheme. Here, the preamble may be formed of a binary string. The reception information may include identification information and configuration information of the wireless power receiver 30. In this case, the preamble may be delivered to the front end portion in the reception period t2 of the response signal.

The controller 140 checks the received response signal 513 and determines whether the preamble is included in the response signal in step 415. If the preamble is included, the wireless power reception unit transmitting the response signal 513 is received. It may be determined that the power reception scheme of the device 30 corresponds to the first transmission scheme.

Therefore, after receiving the response signal 513, the controller 140 waits for a preset time period t3, and controls the first coil unit 120 to control the power 517 in the first transmission method in step 417. Transmit and terminate the wireless power transmission procedure.

In operation 415, if the preamble is not included in the received response signal 513, the control unit 140 transmits the power of the wireless power receiver 30 that transmits the response signal 513 to the second transmission scheme. Can be determined to correspond to.

Therefore, after receiving the response signal 513, the controller 140 waits for a preset time interval t3, and controls the second coil unit 130 to transmit power 517 in the second transmission method in step 419. And the wireless power transmission procedure ends.

9 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention. And, Figure 10 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

Referring to FIG. 9, the wireless power transmission procedure according to another embodiment of the present disclosure starts from the control unit 140 transmitting a status confirmation signal 711 in step 611. Here, the status check signal 711 may be a ping signal. For example, as shown in FIG. 10, the status check signal may be transmitted within a preset time interval t0. As illustrated in FIG. 10, the controller 140 may transmit a status check signal 711 and then wait for a preset time interval t1.

Next, a response signal 713 corresponding to the status confirmation signal 711 may be received. In this case, the controller 140 detects this in step 613. For example, as illustrated in FIG. 10, the response signal 713 may be received from the wireless power receiver 30 within a preset time interval t2.

The controller 140 may check the received response signal 713 in step 615. For example, the response signal may include reception information. The reception information may include identification information and configuration information of the wireless power receiver 30. For example, the configuration information may include a power reception method of the wireless power receiver 30.

The controller 140 may transmit power to the wireless power receiver 30 in step 617 as a power transmission method corresponding to the power reception method of the wireless power receiver 30 based on the received information confirmed in step 615. have.

In detail, when it is determined that the power reception method of the wireless power receiver 30 corresponds to the first transmission method, the controller 140 receives the response signal 713 in advance based on the received information confirmed in step 615. After waiting for the set time period t3, the first coil unit 120 is controlled in step 617 to transmit the power 717 in the first transmission method and terminate the wireless power transmission procedure.

In contrast, when it is determined that the power reception method of the wireless power receiver 30 corresponds to the second transmission method based on the reception information confirmed in step 615, the controller 140 receives the response signal 713 and then presets it. After waiting for the time interval t3, the second coil unit 130 is controlled in step 617 to transmit the power 717 by the second transmission method and terminate the wireless power transmission procedure.

On the other hand, the controller 140 checks the received information of the confirmed response signal 713 and returns to step 611 when the power reception method of the wireless power receiver 30 is not confirmed. The controller repeats at least some of steps 611 to 617.

11 is a flowchart illustrating a wireless power transmission procedure according to another embodiment of the present invention. And, Figure 12 is an exemplary view for explaining a wireless power transmission method according to another embodiment of the present invention.

Referring to FIG. 11, the wireless power transmission procedure according to another embodiment of the present invention starts from the control unit 140 transmitting a status check signal 911 in step 811. Here, the status check signal 911 may be a ping signal. For example, as shown in FIG. 12, the status check signal may be transmitted within a preset time interval t0). As illustrated in FIG. 12, the controller 140 may transmit a status check signal 911 and wait for a preset time period t1.

Next, a response signal 913 corresponding to the status confirmation signal 911 may be received. In this case, the controller 140 detects this in step 813. For example, as illustrated in FIG. 12, the response signal 913 may be received from the wireless power receiver 30 within a preset time interval t2.

In this case, the response signal 913 may include a preamble 914 and reception information 915. For example, as shown in FIG. 12, the preamble 914 may be delivered to the front end of the corresponding time interval t2, and the reception information 915 may be continuously delivered to the preamble 914. In addition, the preamble may include a power reception method of the wireless power receiver 30. Therefore, when the response signal 913 is received in step 813, the controller 140 may check the preamble 914 included in the received response signal 913 in step 815.

The control unit 140 checks the preamble 914 of the response signal 913 confirmed in step 815 and corresponds to the power reception method of the wireless power receiver 30. 30) to transmit power.

In detail, when it is determined in step 815 that the power reception method of the wireless power receiver 30 corresponds to the first transmission method based on the information included in the preamble 914, the control unit 140 returns a response signal 913. After reception, the controller waits for a preset time interval t3, and in step 817, the first coil unit 120 is controlled to transmit power 917 in the first transmission method, and the wireless power transmission procedure is terminated.

On the contrary, if it is determined that the power reception method of the wireless power receiver 30 corresponds to the second transmission method based on the information included in the preamble 914 identified in step 815, the control unit 140 sends a response signal 913. After reception, the controller waits for a preset time interval t3, and controls the second coil unit 130 to transmit power 917 in the second transmission scheme at step 817, and terminates the wireless power transmission procedure.

On the other hand, the controller 140 checks the identified response signal 913 and returns to step 811 when the power reception method of the wireless power receiver 30 is not confirmed. The controller repeats at least some of steps 811 to 817.

According to the present invention, the wireless power transmitter 100 may alternately use the first transmission method and the second transmission method to detect the existence and reception method of the wireless power receiver (30 in FIG. 1). Through this, the wireless power transmitter 100 may effectively charge the wireless power receiver 30 by using the first transmission method and the second transmission method. That is, the wireless power transmitter 100 may transmit power according to a plurality of transmission schemes. Accordingly, the wireless power transmitter 100 may efficiently transmit power in accordance with the reception method of the wireless power receiver 30.

According to an embodiment of the present invention, the control unit 140 checks the response signal received from the wireless power receiver 30, waits for a preset time period t3, and transmits power according to the identified power transmission method. It was. However, the present invention is not limited thereto, and power may be transmitted in a power transmission method continuously confirmed after receiving the response signal without checking the response signal and waiting for a preset time period t3.

That is, the power transmission can be started continuously after receiving the response signal, and the identification information and the configuration information of the wireless power receiver 30 can be confirmed when the power transmission starts.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be implemented.

Claims

Transmitting a first status check signal in a first transmission method;

When the first status response signal is received in response to the first status confirmation signal, transmitting power in the first transmission scheme;

If the first status response signal is not received, transmitting the second status confirmation signal in a second transmission method.
The method of claim 1,

And transmitting power in the second transmission method when a second status response signal is received in response to the second status confirmation signal.
The method of claim 2,

And if the second status response signal is not received, returning to the first status confirmation signal transmission process.
The method of claim 1,

The first status response signal is transmitted within a preset time interval, and includes a preamble of a front end and reception information consecutive to the preamble in the time interval.
The method of claim 4, wherein the transmitting of the power by the first transmission scheme comprises:

And transmitting power in the first transmission method when the preamble is detected.
The method of claim 2,

The second status response signal is transmitted within a preset time interval, and includes a preamble of a front end portion and reception information consecutive to the preamble in the time interval.
The method of claim 6, wherein the transmitting of the power in the second transmission scheme comprises:

And transmitting power in the second transmission method when the preamble is detected.
A first coil unit for a first transmission scheme,

A second coil part for a second transmission method,

Transmitting a first status check signal through the first coil part, and receiving a first status response signal in response to the first status check signal, transmits power through the first coil part, and transmits the first status. And a control unit for transmitting a second status check signal through the second coil unit if a response signal is not received.
The method of claim 8, wherein the control unit,

And transmitting power through the second coil unit when a second state response signal is received in response to the second state confirmation signal.
The method of claim 9, wherein the control unit,

And if the second status response signal is not received, transmitting the first status confirmation signal through the first coil unit.
The method of claim 8,

The first status response signal is transmitted within a preset time interval, and includes a preamble of a front end and reception information consecutive to the preamble in the time interval.
The method of claim 11, wherein the control unit,

And transmitting power through the first coil unit when the preamble is detected.
The method of claim 8,

The second status response signal is transmitted within a preset time interval, and includes a preamble of a front end and reception information consecutive to the preamble in the time interval.
The method of claim 13, wherein the control unit,

And transmitting the power through the second coil unit when the preamble is detected.