KR102003196B1 - Wireless power transmitter for providing movement information of charging area for target and method for controlling thereof - Google Patents

Abstract

Provided is a wireless power transmitting device, which comprises: an antenna array including a plurality of patch antennas, and generating a predetermined scanning wave or power transmitting wave; and a control unit for controlling a transceiving processing unit to transmit power to a target in a predetermined position, and controlling generation of the scanning wave or power transmitting wave. The control unit includes: a power distribution map generating unit for receiving received power information from the target received with the scanning wave, and generating a power distribution map in a space where the target is positioned; and a movement information generating unit for generating movement information for moving the target to a charging area using the power distribution map According to the present invention, reduction in the efficiency of the wireless power transmission can be fundamentally prevented by collecting information on a propagation environment in which the target is positioned, and providing the target with movement information, which can transmit the maximum power to the target using the collected information so as to move the target to a rechargeable area.

Description

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

The present invention relates to a wireless power transmission apparatus, and more particularly, to a wireless power transmission apparatus capable of transmitting movement information on a charging region capable of transmitting wireless power to a target according to an indoor / outdoor propagation environment, The present invention relates to a wireless power transmission apparatus and a control method thereof.

With the recent development of information and communication technology, various services are provided through information communication devices anytime and anywhere, and as the devices for realizing such services are increasingly used as mobile devices such as smart phones and notebook computers, There is a demand for power supply for. In order to supply power to such a mobile device, the user has to inconveniently charge the battery by the commercial power source every time. In particular, with the increasing use of smart sensors in IoT power generation and smart factories as the fourth industry, technologies to supply power to portable devices, smart sensors, and robot cleaners by using wireless power transmission that combines IT technology and energy technology are emerging have.

The wireless power transmission technology is classified into a magnetic induction type, a magnetic resonance type, a magnetic field sensor type, and a radio reception type. The radio wave receiving method radiates radio waves through a transmitter antenna, and a radio wave received through a receiver antenna is converted into a direct current by using a rectifying circuit to receive power and can be used for relatively long distance power transmission.

A wireless power transmitter and its control method disclosed in Korean Patent Publication No. 10-2017-0128052, which is related to wireless power transmission using a radio wave receiving system, outputs a first signal to a patch antenna during a first period, And a second signal output from the patch antenna using a reception wave received from the antenna. As a technique for grasping the target position by minimizing the power consumed during tracking, a wireless power transmitter and control method thereof of Korean Patent Laid-Open Publication No. 10-2017-0112898 includes three communication antennas for receiving a communication signal from a target Thereby determining the target position.

However, the prior art discloses only a technique for wireless power transmission to a fixed target as a technique for determining the position of a target that is a target of wireless power transmission. That is, in the prior art, when the target is located in a radio-shaded area in which the target can not receive the wireless power depending on the propagation environment, the target can not transmit power to the target, or when the target is close to the human body, .

Accordingly, there is a need to develop a new wireless power transmission apparatus capable of improving the efficiency of wireless power transmission by providing movement information to a charging region capable of performing maximum wireless power transmission to a target in consideration of a propagation environment in which a target is located will be.

Korean Patent Publication No. 10-2017-0128052 (Nov. 21, 2017) Korean Patent Publication No. 10-2017-0112898 (October 10, 2017)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a wireless power transmission method and a wireless power transmission method, The present invention provides a wireless power transmission apparatus and a control method thereof that provide movement information about a charged region to a target that can improve the efficiency of the wireless power transmission apparatus.

It is another object of the present invention to provide a wireless power transmission apparatus for providing movement information on a charged region to a target capable of providing movement information about a charged region to a target so as to minimize a human body's influence by determining a position of a human body, And to provide a control method.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus including an antenna array including a plurality of patch antennas to generate a predetermined scanning wave or a power transmission wave, And a control unit for controlling generation of a scanning wave or a power transmission wave by controlling the transmission / reception processing unit to generate a power distribution map in a space in which the target is located by receiving the reception power information from the target to which the scanning wave is transmitted A power distribution map generating unit and a movement information generating unit for generating movement information for moving the target to the charging area using the power distribution map.

According to an embodiment of the present invention, a controller divides a space into a predetermined area to detect a direction of a target, and controls each of the divided areas to emit a first scanning wave, And controls the second scanning wave to be irradiated only to an area where the target determined by the first scanning wave is located.

According to an aspect of the present invention, the controller calculates a distance to a target using a time difference in which received power after receiving a scanning wave is received.

According to an aspect of the present invention, in the control unit, the control unit periodically generates a phase shift in comparison with a signal input to the antenna array after being reflected by a human body irradiated with a scanning wave, And a human reflection wave detector 114 for determining the human reflection wave as a human reflection wave, and exclude the irradiation direction of the scanning wave from which the human reflection wave is detected when generating movement information.

According to an aspect of the present invention, there is provided a power distribution map including a power distribution map, a power distribution map, and a power distribution map according to an embodiment of the present invention. (Xn, Yn, Zn) according to the irradiating direction and irradiation distance of the second scanning wave set in advance, and the unit cells And is set in advance.

According to an embodiment of the present invention, when the received power magnitude of the second scanning wave is equal to or less than a reference value that can be set as a charging area, the movement information generating unit may calculate a received power information A second scanning wave having a shortest time difference in which received power after the second scanning wave is received is received to identify a preset unit cell to determine that the current target 200 is located in the unit cell, And determines to move the target to a predetermined unit cell by matching with the second scanning wave having the largest received power magnitude using the map.

According to an aspect of the present invention, there is provided an apparatus for generating a movement information, the apparatus comprising: a movement information generating unit for generating a movement information of a target by using a coordinate of unit cells matched with a direction of a power transmission wave, And a target tilt correction angle between the target tilt vector and the reference direction vector according to the tilt information received from the target is calculated and transmitted to the target.

According to the present invention, the power transmission apparatus collects information on the radio wave environment in which the target is located, and uses the information to provide movement information capable of transmitting maximum power to the target, thereby moving the target to the rechargeable region It is possible to prevent the reduction of the efficiency of the wireless power transmission due to an obstacle or the like.

In addition, the power transmitting apparatus senses the human body and transmits movement information for minimizing the influence on the human body to the target in consideration of the human body position information at the time of generating movement information for moving the target to the rechargeable region, Can be minimized.

In addition, the power transmission apparatus determines the approximate target position through the first scanning wave having a wide radiation range in order to determine the position of the target, and then determines the position of the target through the second scanning wave, It is possible to minimize power consumption and time in determining the target position.

1 is a block diagram of a wireless power transmission apparatus and a target according to an embodiment of the present invention.
2 is a block diagram illustrating a transmitting and receiving unit of a wireless power transmission apparatus according to an embodiment of the present invention.
3 is a block diagram of a wireless power transmission apparatus for generating movement information on a target according to an embodiment of the present invention.
4A to 4D are schematic diagrams illustrating a process of generating target movement information by determining a target received power by a scanning wave according to an embodiment of the present invention.
5 is a schematic diagram for explaining a process of calculating a direction and a distance to a target using a target received power by a scanning wave according to an embodiment of the present invention.
6 is a flowchart illustrating a control method of a wireless power transmission apparatus for providing movement information on a charged region to a target according to an exemplary embodiment of the present invention.
FIG. 7 is a diagram illustrating a radiation pattern in which the magnitude of a signal supplied to each patch antenna and the beam width and magnitude of a power transmission wave according to phase control are changed.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning. Also, the singular expressions include plural expressions unless the context clearly dictates otherwise. Also, the terms include, including, etc. mean that there is a feature, or element, recited in the specification and does not preclude the possibility that one or more other features or components may be added. Also, in the drawings, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

1 is a block diagram of a wireless power transmission apparatus and a target using a camera according to an embodiment of the present invention.

1, the wireless power transmission apparatus 100 includes an antenna array 130 that includes a plurality of patch antennas and generates a predetermined scanning wave or a power transmission wave, And a control unit 110 for controlling generation of a scanning wave or a power transmission wave by controlling the transmission / reception processing unit 120 to transmit the transmission wave.

The antenna array 130 may have various antenna structures and shapes for radiating electromagnetic waves such that a plurality of patches are arranged in various directions. The transmission / reception processing unit 120 adjusts at least any one or two or more of the magnitude, phase, and operation state of the signal supplied to each patch of the antenna array 130 by controlling the control unit 110, And a beam or a power transmission wave having a beam width and radiate through the antenna array 130. For example, when no signal is supplied to the corresponding antenna patch through the transmission / reception processing unit 120, the antenna patch can be applied to any of the antenna patches No signal is emitted. Here, the power transmission wave is defined as an electromagnetic wave for transmitting power to the target 200 at a predetermined position, and is transmitted through the entire patch of the antenna array or the patch part (antenna group) to grasp the position of the target 200 It is distinguished from a scanning wave which is radiated. The scanning wave is controlled by the control unit 110 to change the irradiation angle of the scanning wave in a preset irradiation direction (various irradiation patterns such as zigzag) in the range of -180 ° to + 180 ° with the beam width and size set in advance, The power of the scanning wave can be transmitted. The scanning wave has a first scanning wave having a predetermined beam width for detecting the approximate direction of the target and a beam having a narrower beam width than the first scanning wave within the range of the target direction detected by the first scanning wave, And a second scanning wave for determining an accurate position.

 A power transmission wave or a scanning wave can be generated by a beam forming technique that is controlled by mutual reinforcement and interference of electromagnetic waves radiated from respective patches of the antenna array 130 (see FIG. 7). Various types of antenna structures and beamforming techniques according to changes in impedance can be achieved by various known methods and are not limited to specific beamforming techniques in the present invention. The control unit 110 may be provided with a predetermined control program for controlling the overall operation of the power transmission apparatus, and may be a micro controller or the like.

The controller 100 may use the antenna control information stored in advance in the memory 150 so as to generate a scanning wave or a power transmission wave and transmit the wireless power. The antenna control information is control information on the magnitude, phase, and operation of the signal supplied to each patch of each antenna array, and generates a scanning wave or a power transmission wave by interference and reinforcement of electromagnetic waves radiated from each patch antenna Can be understood as beamforming information for beamforming.

The position of the target 200 can be determined by the direction and the distance away from the power transmitting apparatus 100, and the determination of the position of the target 200 will be described in detail with reference to FIG. The control unit 100 of the power transmission apparatus 100 receives the received power information received from the target by the scanning wave to generate a power distribution map and accordingly obtains a charging region for charging the target with the maximum efficiency Movement information for moving the target can be generated and transmitted to the target 200. [ The movement information generation will be described in detail with reference to FIG. 3 through FIG.

The target 200 includes a power receiving antenna 230 for receiving a scanning wave or a power transmission wave, a power conversion unit 220 for rectifying the received scanning wave or power transmission wave and converting the wave into a DC, And a control unit 210 for controlling the charging unit 201 and charging to generate reception power information of a scanning wave or a power transmission wave and then transmit it to the power transmission apparatus 100 through the communication unit 240. [ The target 200 may include all electronic devices powered by power, such as smart phones, tablets, home appliances, robot cleaners, smart sensors, and the like.

The control unit 210 monitors the power information stored in the charging unit 201. If the charging power is equal to or less than the preset minimum power, the control unit 210 determines that charging is required, generates charging request information, (100).

On the other hand, when receiving the movement information from the power transmission apparatus 100, the control unit 210 may display direction and distance information for moving from the current position to the rechargeable region on the display unit (not shown) have. For example, if the target is a smartphone, the smartphone receiving the movement information displays the movement information on the display unit, and the user moves the smart phone to the chargeable region by referring to the movement direction and the distance displayed on the display unit, It is possible to move the smart phone to the rechargeable area according to the wireless power transmission environment in the space where the mobile phone is located. On the other hand, if the target is a robot cleaner having a drive unit including a wheel and a motor, the control unit of the robot cleaner that receives the movement information controls the drive unit in accordance with the movement direction and the movement distance at the current position, Can be moved.

2 is a block diagram illustrating a transmitting and receiving unit of a wireless power transmission apparatus according to an embodiment of the present invention.

2, the transmission / reception processing unit 120 may include an amplification unit 124, an attenuator 123, a phase shifter 122, and a first control unit 121.

The transmission / reception processing unit may include a plurality of transmission / reception processing units for controlling the phases and sizes of signals supplied to the respective patches 131 to 131n. The control unit 110 includes a first control unit 120 for controlling each of the transmission / (121) to an n-th control unit 121n. The controller 110 controls the first scanning wave to detect the approximate direction of the target and the second scanning wave to determine the accurate position of the target within the direction range detected by the first scanning wave. Information can be generated and radiated through the antenna array 130.

The control unit 110 transmits size and / or phase information for each patch according to antenna control information previously set for the distance, beam width, and direction of the target determined by the received power information transmitted from the target 200, To the control unit 121 to the n-th control unit 121n to generate a power transmission wave for wireless power transmission.

The power source 101 includes a phase locked loop (PLL) for maintaining the frequency of a signal constant, a power amplifier, an inverter, and a power divider. The power source 101 supplies a predetermined frequency, Phase, and magnitude of power.

Meanwhile, the transmission / reception processing unit 120 detects a signal size and a phase finally supplied to each of the patch antennas 131 to 131n to generate a power transmission wave or a scanning wave, or transmits the scanning wave or the power And a received power detection unit 125 for detecting a human reflected wave signal in which a transmission wave is reflected by a human body. The received power detection unit 125 may include a coupler. A signal finally supplied to each patch or a human reflected wave signal to generate a power transmission wave or a scanning wave is supplied to each of the controllers 121 to 121n To the control unit 110 through the control unit 110. The control unit 110 can classify the scanning wave, the power transmission wave, and the human reflection wave inputted through the power detection unit according to the detected frequency range, the detection time, and the phase displacement.

The human body reflected wave is generated by the difference of the heartbeat and diaphragm in the human body, and the controller 110 compares the scanning wave or the power transmission wave radiated by the inputted signal and the phase shift occurs periodically It is possible to provide information on whether or not a human body exists on the charging region where the target is to be moved by detecting the presence of a human body in the irradiation range of the scanning wave and reflecting the human body in the generation of the power distribution map have.

Therefore, the power transmitting apparatus 100 analyzes the radio wave propagation environment in which the current target is located using the first scanning wave and the second scanning wave, and generates movement information to the charging region that can increase the wireless charging efficiency from the current target position To the target, thereby increasing the wireless transmission efficiency. In addition, when the human body reflected wave corresponding to the radiated scanning wave is detected, the power transmitting apparatus 100 determines that the human body exists in the direction of the scanning wave, reflects the human direction information at the time of generating movement information, By not transmitting power, it is possible to minimize human influence in wireless power transmission.

Hereinafter, a wireless power transmission apparatus for analyzing a wireless power propagation environment in wireless power transmission and providing movement information on a charging region to a target will be described in detail with reference to FIG. 3 to FIG.

First, a method for determining a direction and a distance in which a target is positioned by a scanning wave will be described with reference to FIG. FIG. 5 is a schematic diagram for explaining a process of calculating a direction and a distance to a target using a target received power by a scanning wave according to an embodiment of the present invention. Referring to FIG. 5, The scanning waves S1, S2, ..., Sn, which are radiated by the light source 1, can be radiated periodically with a predetermined size, direction and beam width. The scanning wave radiated from the power transmission apparatus 100 and the communication signal of the communication unit are synchronized so that the controller 110 can calculate the distance to the target when receiving the received power information from the target. For example, if the target receiving the S1 after the scanning wave S1 is radiated at the time of T1 generates the reception power information according to S1 and transmits the reception power information to the power transmission device at the time T2, the control unit 110 controls the communication with the scanning wave The distance (D = C *? T) to the target can be calculated according to the time difference (DELTA T = T2 - T1) at which the received power according to S1 is received from the target after the radiation of the scanning wave S1 because the signals are synchronized have. Therefore, the control unit 110 can determine the target direction according to the preset radial direction of the scanning wave, and finally determine the position of the target by determining the distance according to the time difference. The position of the target can be understood as a three-dimensional vector centering on the antenna array on the three-dimensional space and along the direction and distance of the scanning wave.

FIG. 3 is a block diagram of a wireless power transmission apparatus for generating movement information on a target according to an exemplary embodiment of the present invention. FIGS. 4A to 4D are diagrams illustrating a relationship between a target received power by a scanning wave according to an exemplary embodiment of the present invention And generates target movement information.

3, the control unit 110 of the power transmission apparatus 100 receives the received power information from the target having received the radiated scanning wave and generates a power distribution map in a space in which the target is located, (112) for generating movement information for moving the target to the charged region using the power distribution map, and a movement information transmitting unit (112) for controlling the generated movement information to be transmitted to the target through the communication unit Section 113. [0034] The control unit 110 further includes a human body reflected wave detector 114 for determining that the signal is a human reflected wave when a phase shift is periodically generated by comparing a signal reflected by a human body irradiated with the scanning wave and input to the antenna array, .

4A, the controller 110 of the power transmitting apparatus 100 divides a space into predetermined areas A1, A2, A3, and A4 to detect the approximate direction in which the target is located, (S1, S2, S3, S4) with respect to the divided space according to a preset irradiation order, receives the received power information from the target that has received each first scanning wave, 1 target direction (refer to S61 and S63 in Fig. 6). The controller 110 controls the magnitude and phase of signals applied to all antenna patches of the antenna array 130 to generate a first scanning wave and irradiate the first and second scanning waves according to a preset irradiation pattern. On the other hand, referring to (b) of FIG. 4A, the controller 110 controls the irradiation of the first scanning wave to all of the areas (A1, A2, A3, A4) It is possible to control signals applied to the respective antenna groups G1, G2, G3 and G4 by using the preset antenna group information. The antenna group may be composed of a plurality of antenna patches constituting the antenna array. The control unit 110 controls the signal applied to the antenna array so that the antenna array G1 generates the first scanning wave S1 in the divided A1 region by using the antenna group information having the irradiation range set in advance, G2 controls the signal applied to the antenna array to generate the first scanning wave S2 in the partitioned A2 area and the antenna array G3 controls the signal applied to the antenna array G3 to generate the first scanning wave S2 in the partitioned A3 area. And the antenna array G4 controls the signal applied to the antenna array so as to generate the first scanning wave S4 in the divided A4 area so as to detect the approximate position of the target in a short time . Here, it is described that the antenna group information in which the survey range is preset is set to four antenna groups, but the present invention is not limited thereto, and the number may be changed according to the number of spaces in which the target deviated space is partitioned.

The power transmitting apparatus 100 irradiates the above-described first scanning wave to a space in which a target is located at a predetermined time interval using preset antenna group information, (Direction and distance), and when an area where the target is located by the first scanning wave is determined, by irradiating the second scanning wave only with respect to the area where the target is located, Consumption and detection time can be minimized.

Referring to FIG. 4B, the control unit 110 irradiates the second scanning wave S11, S1K, ... S1n only to the region A1 in which the target determined by the first scanning wave is located, It is possible to accurately determine the direction and the distance in which it is positioned. The determination of the position of the target by the second scanning wave can be performed by the same method as that of FIG. That is, the second scanning wave can determine the position of the target by a small number of scanning waves by limiting the area A1 detected by the first scanning wave to the irradiation range, instead of irradiating the whole space where the target is located The power consumption and the detection time can be minimized. The second scanning wave can be controlled to have a smaller beam width than the first scanning wave and the irradiation distance of the second scanning wave can be controlled in accordance with the distance of the approximately detected target by the first scanning wave.

Referring to FIG. 4C, the target receiving the second scanning wave transmits the received power information to the power transmitting apparatus 100, and the power distribution map generating unit 111 of the controlling unit 110 generates the second scanning The power distribution map 500 can be generated using the received power information according to the wave (see (a)). For example, the predetermined reception power reference value may be classified into a reference value M0 that can not transmit electric power, a minimum reference value M1 that can transmit electric power, and a reference value M2 that can be set as a charging area with a power transmission efficiency of 90% , It is natural that this classification can be set to a plurality of reference values as required (see (b)). The power distribution map 500 may be displayed in four levels (L1, L2, L3, and L4) according to the received power level in comparison with the preset received power reference values (M0, M1, M2) S65).

The power distribution map 500 includes unit cells P1, Pk (P1, P2, ..., Pk) for indicating the received power magnitude according to the irradiation direction and the irradiation distance of the second scanning wave irradiated on the space A1 determined by the first scanning wave, , ..., Pn). The unit cells P1, Pk, ..., Pn may be distributed in a three-dimensional space around the antenna array 130. The unit cells P1, Pk, ..., Pn are combined with the three-dimensional coordinates Xn, Yn, Zn according to the irradiation direction and the irradiation distance of the second scanning wave, And can be stored and managed as antenna control information. For example, the control unit may control a signal applied to the antenna array to generate a second scanning wave using the three-dimensional coordinates of a unit cell previously set according to an area determined by the first scanning wave and a target distance according to preset antenna control information, Can be controlled. Therefore, each second scanning wave is a vector having a direction and a distance centered on the antenna array, and the end point of the vector can be understood as a three-dimensional coordinate of a unit cell stored in advance.

4D is a graph showing the magnitude of the received power by the second scanning wave. Referring to FIG. 4D and FIG. 4A, the moving information generating unit 112 calculates the magnitude of the received power by the second scanning wave at the current target 200 position, Is equal to or smaller than the reference value M2 that can be set to the charging region where the power transmission efficiency is 90% or more, it can be determined that the target should be moved. In order to generate the movement information, the movement information generating unit 112 first calculates a time difference (DELTA T = T2 - T1) at which the received power after the radiation of the second scanning wave is received among the received power information received by the second scanning wave It is determined that the target 200 is located in the corresponding unit cell by checking a preset unit cell matched with the short second scanning wave. Then, the movement information generation unit 112 uses the power distribution map to identify a predetermined unit cell matched with the second scanning wave having the largest received power magnitude, and moves the target 200 to the identified unit cell . That is, the movement information generation unit 112 determines that the current position 200 of the target 200 is a shaded area where power transmission is impossible, and determines the position P (k + it may be determined that the target 200 should be moved with a). Finally, the movement information generation unit 112 generates a movement information by using a coordinate value of each unit cell with respect to the current target position Pk and the movement position P (k + a) Movement information can be generated. For example, a target movement direction can be calculated through a direction vector using Pk = x1, y1, z1 and P (k + a) = x2, y2, , And the moving distance can be calculated through a mathematical operation for obtaining the distance between two points on the space (refer to S67 in Fig. 6).

If the magnitude of the received power by the second scanning wave is equal to or greater than 90% and equal to or less than the reference value M2 that can be set in the charging area, even if the power transmission wave is generated and radiated in the direction in which the received power magnitude is maximum, The efficiency may not be obtained. Therefore, when all the received power magnitudes do not reach the predetermined reference value M2, the power transmitting apparatus 100 determines that the target should be moved, and uses the unit cell information matched with the preset second scanning wave to charge the target It is possible to increase the wireless transmission efficiency by providing target movement information for moving to the area (refer to S69 in Fig. 6). The power transmission apparatus 100 determines the received power magnitude by radiating a second scanning wave corresponding to the target movement position even after the target movement according to the target movement information, and when the received power magnitude is equal to or greater than a preset reference value M2, The direction and distance of the scanning wave can be used to generate a power transmission wave and radiate to the target.

The beam direction of the power transmission wave radiated from the power transmission apparatus 100 and the power reception antenna of the target can be maintained at a maximum vertical position to increase the wireless power transmission efficiency. For this, when the power receiving antenna is disposed horizontally with respect to the target and the tilt information of the target coincides with the tilt information of the power transmitting apparatus, the movement information generating unit 113 receives the target tilt information from the target, And the target tilt correction information for maintaining the state in which the beam direction of the power transmission wave and the power receiving antenna of the target are kept at the maximum vertical position can be generated and transmitted to the target. Here, the tilt information of the power transmission apparatus and the tilt information of the target may be obtained through a tilt sensor, for example, a gyro sensor or the like. The movement information generation unit 113 calculates a reference direction vector orthogonal to the direction vector of the power transmission wave using the coordinate information of the unit cells matched with the direction of the power transmission wave radiated to the target, The angle between the target inclination vector according to the information and the reference direction vector can be calculated through a mathematical operation. That is, the movement information generating unit 113 generates the angle of inclination at the target tilt correction angle and transmits it to the target, and the target that receives the correction angle corrects the target tilt according to the correction angle so as to be perpendicular to the power transmission wave The slope of the target can be adjusted.

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 embodiments, but, on the contrary, I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: power transmission device 101: power source
110, 210: Control section 111: Power distribution map generation section
112: movement information generation unit 113: movement information transmission unit
114: human reflection wave detector 120: transmission /
122: phase shifter 123: attenuator
124: amplifying unit 125: receiving power detecting unit
130: antenna array 131: patch antenna
140, 240: communication unit 150, 250: memory
200: target 220: power conversion unit
230: power receiving antenna 201:
1000: Wireless power transmission / reception system

Claims (7)

In a wireless power transmission apparatus,
An antenna array 130 that includes a plurality of patch antennas and generates a predetermined scanning wave or a power transmission wave,
And a control unit (110) for controlling generation of a scanning wave or a power transmission wave by controlling the transmission / reception processing unit (120) to transmit power to the target (200) at a predetermined position,
The control unit 110
A power distribution map generation unit (111) for receiving received power information from a target to which a scanning wave is transmitted and generating a power distribution map in a space in which the target is located, and a power distribution map generation unit Information generating unit 112 for dividing a space into a predetermined area so as to detect the direction of the target and controlling each of the divided areas to emit a first scanning wave, Controls to irradiate the second scanning wave only with respect to the region where the target determined by the first scanning wave is located,
Each of the unit cells (P1, Pk, ...) representing the received power magnitude according to the irradiation direction and the irradiation distance of the second scanning wave irradiated on the space determined by the first scanning wave. Pn), and the unit cell is previously set to three-dimensional coordinates (Xn, Yn, Zn) according to a preset irradiation direction of the second scanning wave and an irradiation distance,
When the received power level of the second scanning wave is equal to or lower than a reference value that can be set as the charging range, a difference in time between the reception power of the second scanning wave and the reception power of the second scanning wave is received It is determined that the current target 200 is positioned in the unit cell that matches the second shortest scanning wave to determine a predetermined unit cell. Then, using the power distribution map, matching is performed with the second scanning wave having the largest received power magnitude And generates movement information including information on the movement direction and the movement distance of the target using the coordinate values of the unit cells previously set.
delete The method according to claim 1,
Wherein the controller calculates the distance to the target using a time difference in which the received power after the emission of the scanning wave is received.
The method according to claim 1,
The control unit may further include a human reflected wave detector 114 for comparing the signal reflected by the human body irradiated with the scanning wave and inputted to the antenna array and the reflected wave when the phase shift periodically occurs, ,
And excludes the irradiation direction of the corresponding scanning wave from which the human reflected wave is detected when generating the movement information.
delete delete The method according to claim 1,
The movement information generation unit calculates a reference direction vector orthogonal to a direction vector of the power transmission wave using coordinate information of unit cells matched with the direction of the power transmission wave irradiated to the target, And generates an angle between the target tilt vector and the reference direction vector at a target tilt correction angle, and transmits the generated angle to the target.

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