KR102211836B1 - Wireless power transmitter and method for controlling thereof - Google Patents

Abstract

The present invention receives a position detection wave from an antenna array and a target through the antenna array, and compares the size of the reception power of the position detection wave received by each patch antenna with a preset reception power size to determine the distance and beam width of the target. It provides a wireless power transmission apparatus including a control unit to determine the power transmission wave according to the determined distance and beam width.
According to the present invention, by determining the position of the target through the antenna array by the position detection wave, unnecessary power consumption due to the scanning wave can be prevented, and the structure is simple because a plurality of communication antennas are not required.

Description

Wireless power transmitter and control method thereof {WIRELESS POWER TRANSMITTER AND METHOD FOR CONTROLLING THEREOF}

The present invention relates to a wireless power transmission apparatus and a control method thereof, and more particularly, to a wireless power transmission apparatus capable of transmitting wireless power to a target and a control method thereof.

With the recent development of information and communication technology, various services are provided through information and communication devices anytime, anywhere, and as devices that implement these services, the spread of portable devices such as smartphones and notebook computers increases, and the use of the mobile devices for a long time is naturally reduced. There is a demand for power supply for this. In supplying power to such a portable device, the user is inconvenient in having to charge the battery using commercial power every time. In particular, with the development of IoT and the increase in use of smart sensors in smart factories as the fourth industry, technologies to supply power to portable devices and smart sensors using wireless power transmission that combines IT and energy technologies are emerging.

Wireless power transmission technology is classified into magnetic induction method, magnetic resonance method, magnetic field sensor method, and radio wave reception method. The radio wave reception method is a method of receiving power by converting radio waves radiated through a transmitter antenna into direct current using a rectifier circuit, and may be used for relatively long distance power transmission.

As a technology related to wireless power transmission using a radio wave receiving method, the wireless power transmitter of Korean Patent Laid-Open No. 10-2017-0128052 and its control method outputs a first signal to a patch antenna during the first period, and externally during the second period. Disclosed is a wireless power transmitter that processes a second signal output from a patch antenna using a received wave received from However, the prior art has a problem in that power consumption is large as tracking is performed through a patch antenna of a transmitter in order to find a target to transmit wireless power. As a technology for identifying the location of a target by minimizing power consumed during tracking, the wireless power transmitter of Korean Patent Laid-Open Publication No. 10-2017-0112898 and its control method includes three antennas for receiving communication signals from the target. There is a problem in that the structure becomes complicated as the target position is determined through the method.

Therefore, power can be minimized during scanning to determine the location of the target, and a single communication antenna for transmitting information with the target is provided to quickly and quickly determine the location of the target, preventing wireless power loss due to obstacles, and wireless power. There is a need for a new wireless power transmission device and a control method for minimizing the human body effect by transmission.

Republic of Korea Patent Publication No. 10-2017-0128052 (2017.11.22) Republic of Korea Patent Publication No. 10-2017-0112898 (2017.10.12)

The present invention was conceived to solve the above-described problem, and an object of the present invention is to minimize power during scanning to determine the location of a target, and to provide a single communication antenna for transmitting information with the target quickly and quickly. It is to provide a wireless power transmission apparatus and a control method thereof capable of efficiently identifying the location of a target and transmitting power efficiently.

In addition, an object of the present invention is a wireless power transmission device capable of increasing the efficiency of wireless power transmission by transmitting at least two or more power transmission waves to a target with a predetermined beam width so as to minimize the effect on the human body by determining the location of the target, and It is to provide the control method.

In order to solve the above problems, the wireless power transmission apparatus according to an embodiment of the present invention radiates a scanning wave in a preset irradiation direction to determine the position of a target through an antenna array and the antenna array, and each of the scanning It may include a control unit that compares the amount of received power transmitted from the target that has received the wave with the preset amount of received power to determine the distance and beam width of the target, and controls to emit a power transmission wave according to the determined distance and beam width. have.

In order to solve the above problem, the wireless power transmission apparatus according to an embodiment of the present invention receives a position detection wave radiated from an antenna array and a target through the antenna array, and the position detection wave received by each patch antenna. It may include a control unit that compares the size of the received power of the received power with a preset received power size to determine a distance and a beam width of a target, and controls to emit a power transmission wave according to the determined distance and beam width.

According to the present invention as described above, the power transmission device determines the position of the target using the received power information transmitted from the target receiving the scanning wave and controls the beamforming according to the preset antenna control information, thereby increasing the maximum power to the target. It can be transmitted efficiently.

Therefore, when the reception power transmitted from the target is lower than the preset reception power reference value, the power transmission device determines that the irradiation range (direction) of the corresponding scanning wave is an obstacle and prevents the power transmission wave from radiating in the corresponding direction. By controlling the beam width of the power transmission wave and the power transmission wave to have at least two or more different paths, if an obstacle is a human, it is possible to minimize the influence on the human body due to wireless power transmission.

The power transmission device can prevent unnecessary power consumption by the scanning wave as the position detection wave radiated from the target detects the size and phase of the signal input through the antenna array and determines the position of the target. The structure is simple as it does not need.

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 transmission/reception processing unit of a wireless power transmission apparatus according to an embodiment of the present invention.
3 is a block diagram of a target according to an embodiment of the present invention.
4A to 4D are conceptual diagrams and flowcharts illustrating a process of finding a target by minimizing an irradiation range during scanning according to an embodiment of the present invention. .
5A and 5B are conceptual diagrams and flowcharts for wireless power transmission by detecting and avoiding an obstacle between a transmitting device and a target according to an embodiment of the present invention.
6A to 6B are conceptual diagrams and flowcharts for transmitting power to a plurality of targets according to an embodiment of the present invention.
7A to 7B are conceptual diagrams and flowcharts for transmitting power when a target moves according to an embodiment of the present invention.
8 is a diagram illustrating a radiation pattern in which a beam width and a magnitude of a power transmission wave are changed according to a magnitude and phase control of a signal supplied to each patch antenna.

Since the present invention can apply various transformations and have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. Effects and features of the present invention, and a method of achieving them will be apparent with reference to the embodiments described later in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms. In the following embodiments, terms such as first and second are not used in a limiting meaning, but are used for the purpose of distinguishing one component from another component. In addition, expressions in the singular include plural expressions unless the context clearly indicates otherwise. In addition, terms such as include or have means that the features or elements described in the specification are present, and do not preclude the possibility of adding one or more other features or elements in advance. In addition, in the drawings, the size of components may be exaggerated or reduced for convenience of description. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to what is shown.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when describing with reference to the drawings, the same or corresponding constituent elements are assigned the same reference numerals, and redundant descriptions 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.

As shown in FIG. 1, the wireless power transmission apparatus 100 is composed of a plurality of patch antennas and transmits power to an antenna array 130 that generates a predetermined scanning wave or a power transmission wave, and a target 200 at a predetermined position. It may include a control unit 110 that controls the generation of a scanning wave or a power transmission wave to be transmitted.

The antenna array 130 may have various antenna structures and shapes for radiating electromagnetic waves in a manner in which a plurality of patches are arranged in various directions. The transmission/reception processing unit 120 adjusts at least one or two or more of the size, phase, and operation status of the signal supplied to each patch of the antenna array 130 under the control of the control unit 110 to provide a predetermined size and direction. And a scanning wave or a power transmission wave having a beam width. The operation status means whether a signal is supplied to the antenna patch. For example, when a signal is not supplied to the antenna patch, the patch does not emit any signal. Here, the power transmission wave is defined as an electromagnetic wave for finally transmitting power to the target 200 at a predetermined location, and through the entire patch or part of the patch (antenna group) of the antenna array to determine the location of the target 200 It is distinct from the radiated scanning wave. The scanning wave has a preset beam width and size under the control of the controller 110 and is sequentially in the range of -180° to +180° or in a preset irradiation order, or within a direction range determined by the position detection wave. The power of the scanning wave can be transmitted to the target by changing the irradiation range (angle). The power transmission wave or the scanning wave may be formed by a beamforming technique that controls to be generated by mutual reinforcement and interference of electromagnetic waves radiated from each patch of the antenna array 130 (see FIG. 8). Beamforming techniques according to various types of antenna structures and changes in impedance may be performed by various known methods, and the present invention is not limited to a specific beamforming technique. The control unit may be installed with a predetermined control program to control the overall operation of the power transmission device, and may be formed of a microcontroller.

The control unit 110 may use antenna control information stored in advance in the memory 150 so that the scanning wave or the power transmission wave can transmit wireless power. The antenna control information is control information on the magnitude, phase, and operation of signals 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. It can be understood as beamforming information for. In addition, the antenna control information may include reception power distance information on a reference power level capable of determining the distance by comparing the received power transmitted from the target receiving the scanning wave or the power transmission wave. For example, in order to determine the direction of the target 200 somewhere in space, the control unit 100 may have a first scanning wave, a second scanning wave, or an n-th scanning wave formed by sequentially changing the irradiation angle with a preset beam width and size. Can be transmitted to the target. In this case, the target 200 may transmit the received power information received by the first scanning wave, the second scanning wave to the n-th scanning wave to the power transmission device 100 through the communication unit 240. The power transmission device 100 sequentially radiates each of the first scanning wave, the second scanning wave to the n-th scanning wave in a range of -180° to +180° with a reference power size of 40 mW, for example, as shown in Table 1 below. It is assumed that reception power information is received from the target 200.

Irradiation angle Sent from the target
Receiving power (mW) Antenna control information (memory) Distance(m) Receiving power (mW) First scanning wave -180° 0 One 18.52 .
.
.
Below the preset reference value (10mW)
2

15.57 K-1 scanning wave -10° 13.56 3 10.53 Kth scanning wave 0° 15.26 4 5.84 K+1th scanning wave +10° 14.05 5 3.25 .
.
.
Below the preset reference value (10mW)
6
2.15
Nth scanning wave +180° 0 7 1.12

Referring to Table 1, the control unit 110 includes a maximum value (15.26mW) of received power received from a target and a reference power level of 40mW in preset antenna control information when the receiving power is 15.57mW from the target antenna array. It can be determined that the distance between them is 2m. At the same time, the control unit 110 may determine the beam width information, which is the irradiation angle of the scanning waves of K-1, K, and K+1 that are equal to or greater than a preset reception power reference value (10mW), -10° to +10°. Therefore, the control unit 110, which has determined the distance, beam width, and direction of the target by the scanning wave (the direction is already determined by the scanning wave), is preset to generate a power transmission wave having a distance of 2 m and a beam width of -10° to +10°. The power transmission wave may be transmitted to the target 200 at the determined position through the antenna array 130 by controlling the transmission/reception processing unit 120 according to the antenna control information.

2 is a block diagram illustrating a transmission/reception processing unit of a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 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 120 may be formed in plural to control the phase and magnitude of the signal supplied to each of the patches 131 to 131n, and the control unit 110 is configured to control each transmission/reception processing unit 120, respectively. It may include a first control unit 121 to an n-th control unit 121n. The controller 110 controls each patch according to the antenna control information set in advance for the distance, beam width, and direction of the target determined by the received power information transmitted from the target 200 (the direction is already determined by the scanning wave). A power transmission wave for wireless power transmission may be generated by transmitting the size and/or phase information for the first control unit 121 to the nth control unit 121n.

The power source 101 includes a phase locked loop (PLL) for maintaining a constant frequency of a signal, a power amplifier, an inverter, a power divider, etc. to each transmit/receive processing unit 120 with a predetermined frequency, It can supply power with phase and magnitude.

Meanwhile, the transmission/reception processing unit 120 detects the magnitude and phase of a signal finally supplied to each of the patch antennas 131 to 131n in order to generate a power transmission wave or a scanning wave, or is transmitted from the target through each of the patch antennas 131 to 131n. It may further include a reception power detection unit 125 for detecting a signal input to each patch by the position detection wave. The reception power detection unit 125 may be formed of a coupler, and a signal finally supplied to each patch or a signal input by a position detection wave to generate the detected power transmission wave or scanning wave is the first control unit 121 ) Through the control unit 110. The position detection wave has a predetermined frequency, amplitude (amplitude), and phase by a communication unit 240 including a phase locked loop (PLL), a power amplifier, and a filter to keep the frequency of the signal constant. It may be input to the antenna array 130 of the power transmission device 100 through the power receiving antenna 230 under the control of the controller 210. The position detection wave will be described in detail in FIG. 3.

3 is a block diagram of a target according to an embodiment of the present invention.

1 and 3, the target 200 includes a power receiving antenna 230 that receives a scanning wave or a power transmission wave, and a power conversion unit that rectifies the received scanning wave or power transmission wave and converts it to DC ( 220), the charging unit 201 for charging the converted direct current and controlling the charging, generating the received power information of the scanning wave or the power transmission wave, and then controlling the transmission to the power transmission device 100 through the communication unit 240 It includes a control unit 210. The target 200 may include all electronic devices operated by electric power, such as a smart phone, a tablet, a home appliance, and a smart sensor.

The control unit 210 monitors the power information charged in the charging unit 201, and when the charging power is less than the preset minimum power, determines that charging is necessary, generates a position detection wave, and transmits the power through the communication unit 240. Can be transmitted to (100). The position detection wave may be formed in the same frequency band as the power transmission wave or a separate communication channel frequency band, and may include wireless charging request information. The position detection wave has a size and phase, and a preset reference radiation power may be set, and the preset reference radiation power is used by the power transmission device 100 to determine the distance of the target according to the received power of the position detection wave. It may be included in the antenna control information stored in advance in the memory 150 so as to be performed. The target 200 includes a switching unit 260 for forming a transmission path between the communication unit 240 and the power receiving antenna 230 in order to transmit the position detection wave to the antenna array 130 through the power receiving antenna 230. Can include. When receiving the power transmission wave, the switching unit 260 may be formed of a circulator that can connect the power receiving antenna 230 and the power conversion unit 2220 under the control of the control unit 210. . When the position detection wave is radiated through an antenna (not shown) of the communication unit 240 or through the power receiving antenna 230, the antenna array 130 of the power transmission device and the antenna of the communication unit 140 (not shown) City) can be received. When the position detection wave is radiated through the power receiving antenna 230 through the switching unit 260 and input to the antenna array 130, more accurate power than when radiated through the antenna (not shown) of the communication unit 240 The power transmission device 100 senses the location of the reception antenna 230, thereby improving wireless power transmission efficiency.

Therefore, the power transmission device 100 can efficiently transmit the maximum power to the target by determining the location of the target using the received power information transmitted from the target receiving the scanning wave and controlling the beamforming according to the preset antenna control information. have. In addition, the power transmission device 100 determines that there is an obstacle at the irradiation angle (direction) at which the reception power lower than the reference value of the reception power set in advance by the scanning wave is received, and transmits power so that the power transmission wave is not radiated in that direction. By controlling the wave beam width, if an obstacle is a human, it is possible to minimize the effect on the human body due to wireless power transmission.

Hereinafter, various embodiments using the position detection wave will be described in detail with reference to FIGS. 4A to 7B to prevent power consumption and to quickly determine the position in determining the position of the target in wireless power transmission.

4A to 4D are conceptual diagrams and flowcharts illustrating a process of finding a target by minimizing an irradiation range during scanning according to an embodiment of the present invention.

4A and 4D, the power transmission device 100 uses an antenna for a position detection wave radiated from a target without first radiating a scanning wave for determining the position of the target 200 in FIGS. 1 and 2 described above. By receiving through the array 130, the position of the power receiving antenna 230 can be accurately determined. Therefore, the power transmission device 100 does not need to consume power according to the scanning wave radiation, and quickly detects the power level of the position detection wave input to the antenna group consisting of at least one or more patches. You can determine the location.

First, the power transmission device 100 maintains a state in which it waits for reception of the position detection wave (S401). When it is determined that wireless charging is necessary, the target 200 radiates the position detection wave through the power receiving antenna 230, and each antenna group A1 of the antenna array is routed through the paths of W1, W2, W3, W4, and W5. ,A2,A3,A4). For the sake of explanation, the position detection wave is indicated by W1 to W5, but it is natural that the position detection wave is input to each patch antenna constituting the antenna array. Here, the direction in which the antenna groups A1, A2, A3, and A4 radiate the power transmission wave may be set in advance according to antenna control information preset in the memory. When the reception power of the position detection wave input through the reception power detection unit 125 is greater than a preset reference power, the wireless transmission device 100 sequentially operates the antenna groups A1, A2, A3, and A4. By controlling, the amount of received power received for each antenna group A1, A2, A3, and A4 may be detected (S402). Continuously, the wireless transmission device 100 compares the size, phase, and detection time information of the received power for each detected antenna group (A1, A2, A3, A4), and the antenna group having the largest reception power size of the position detection wave ( By determining A2) and comparing it with preset antenna control information, the direction in which the power transmission wave is to be emitted can be determined. Meanwhile, the wireless transmission device 100 may determine the distance of the power receiving antenna by using the maximum received power size of the position detection wave received by the plurality of patch antennas in the determined antenna group A2 and distance information according to the preset radiation power. Can be (S403). Next, the wireless transmission device 100 forms a power transmission wave B according to the direction and distance determined through a plurality of patch antennas consisting of the antenna group A2 to quickly power the power receiving antenna of the target 200. Can be transmitted (S404).

4B shows that even when the direction and distance of the power receiving antenna 230 are determined by S401, S402 and S403 of FIGS. 4B and 4C, the wireless transmission device 100 is more accurate than the target 200. In order to determine the direction, scanning waves b1, b2, b3, b4, b5 having a limited irradiation range may be generated and radiated by the entire patch antenna or antenna group A2. Referring to FIGS. 4B(b) and 4D, the wireless transmission device 100 is connected to the antenna group A2 without the need to perform scanning to change the irradiation angle of the scanning wave in the entire range of -180° to +180°. By radiating the scanning waves (b1, b2, b3, b4, b5) only in the limited irradiation range in the predetermined radiation direction, the direction and distance of the power transmission wave can be more accurately reset by using the received power received from the target. . 5A, the beam width is determined by comparing the received power of each scanning wave according to the scanning waves (b1, b2, b3, b4, b5) radiated only in a limited irradiation range, and the beam width of the power transmission wave (B) is determined. It is possible to minimize the influence on the human body by not transmitting the power transmission wave in the direction determined as the person (1, 2) (S408). Thereafter, the wireless transmission apparatus 100 may rapidly transmit power to the power receiving antenna 230 by forming a power transmission wave through the antenna array according to the reset irradiation direction, beam width, and distance (S409).

Referring to FIG. 5B, on the other hand, the wireless transmission apparatus 100 may detect the size, phase, and time of the position detection waves W1, W2, and W3 received by the antenna array in a predetermined direction or position. The wireless transmission device 100 has a larger W1 (arrives at time T1 through the shortest path) and W2 (outer wall, etc.) compared with a preset received power size among the sizes of the received position detection waves (W1, W2, W3). Arriving at time T2 through the reflection path of, it is possible to determine a preset direction for T1 <T2). Here, since the position detection wave W2 is smaller than a preset reception power level due to the influence of an obstacle (person) in the middle, the wireless transmission device may control not to emit the power transmission wave in the W2 direction. The wireless transmission device 100 radiates two power transmission waves (B1, B2) having two different paths (directions) determined by the position detection waves (W1 and W2) using preset antenna control information. By transmitting B1 and then transmitting B2 at a time interval of (T2-T1), the target 200 may enhance power transmission efficiency by reinforcing two power transmission waves to reach each other at the same time. In FIG. 5B, power transmission waves having different paths by the position detection wave have been described, but power transmission waves having two different paths having a time delay are also described by the received power information received from the target by the scanning wave. It would be natural to be able to transmit to the target.

In FIGS. 4A to 4D, one target has been described, but the present invention is not limited thereto, and wireless power transmission is possible for two or more targets at the same time, which will be described with reference to FIGS. 6A and 6B.

6A to 6C are conceptual diagrams and flowcharts for transmitting power to a plurality of targets according to an embodiment of the present invention.

Referring to FIG. 6A, FIG. 4B shows that even when the direction and distance of the target 200 are determined by S401, S402, and S403 of FIGS. 4B and 4C, the wireless transmission device 100 may include a plurality of targets ( In order to determine the direction for simultaneous transmission to the power receiving antennas 230 of 200a and 200b), a plurality of scanning waves (b) having a limited irradiation range can be generated and radiated by the entire patch antenna or antenna group (A2). have. By using the received power received from the plurality of targets 200a and 200b respectively by each scanning wave, the wireless transmission device 100 determines the beam width information and adjusts the beam width of the power transmission wave B to simultaneously target multiple targets. Can transmit power transmission wave.

Referring to (a) of FIG. 6B, when the center distance information between targets is not transmitted, the wireless transmission device 100 is a plurality of scanning devices that change the irradiation angle in a range of -180° to +180° or a limited irradiation range. When scanning through the waves b1 to b6, there is a problem that not only power consumption is high, but also the scanning time is long.

Referring to (b) of FIG. 6, the plurality of targets 200a and 200b calculate the distance between targets through communication, and generate center distance information 291 using the calculated distance, and the power transmission device 100 Can be transferred to. Therefore, when the wireless transmission device 100 radiates the scanning wave of b1 and then moves by a preset irradiation angle and receives the received power information and center distance information from the first target 200a receiving the radiated b2 scanning wave, It may be determined that only the second target 200b is located away from the first target 200a by a center distance. Therefore, the wireless transmission device 100 uses the center distance information, and the subsequent scanning range is centered on the first target 200a without the need to radiate the scanning waves b3, b4, b5, and b6 of FIG. 6(a). As a result, it is possible to quickly receive received power information from the second target 200b by radiating only the scanning wave b7 for which the irradiation angle is newly set at a location separated by the center distance. Referring to Figure 6(c), by radiating only a minimum scanning wave using the center distance, the positions of the two targets are determined, and the beam width is adjusted accordingly to minimize power consumption and rapidly transmit wireless power to multiple targets simultaneously. It can emit power transmission waves that can do.

7A to 7B are conceptual diagrams and flowcharts for transmitting power when a target moves according to an embodiment of the present invention.

7A and 7B, the wireless transmission device 100 may receive received power information from the target 200 for a certain period while the target 200 is being charged by the power transmission wave ( S701). When the size of the received power (refer to (b) of FIG. 7A) changes, the wireless transmission device 100 determines that the target 200 is moving during charging, and forms a preset movement detection scanning wave in four directions. It may be sequentially transmitted to the transmission target (S702). Although it has been described that the movement detection scanning wave is preset in four directions, the present invention is not limited thereto, and may be set in a plurality of directions according to the characteristics of the space. Continuously, the wireless transmission device 100 tracks the target position by using the cargo reception power information according to the movement detection scanning wave (S703). Finally, when it is determined that the received power information does not change for a predetermined time, the target is determined to be stopped and a scanning wave for determining the target position within a preset irradiation direction range of the movement detection scanning wave radiating at the pause time ( b1, b2, b3, b4, b5) can be sequentially emitted. Finally, by comparing the received power of each of the scanning waves (b1, b2, b3, b4, b5), the distance to the target and the beam width are determined, and the power transmission wave is radiated to accurately transmit the wireless power to the target. Yes (S704).

In the above, the present invention has been described in detail through exemplary embodiments, but those of ordinary skill in the art to which the present invention pertains have found that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should not be determined by the claims to be described later, but also by those equivalents to the claims.

100: power transmission device 101: power source
110,210: control unit 120: transmission/reception processing unit
122: phase shifter 123: attenuator
124: amplification unit 125: received power detection 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: charging unit
1000: wireless power transmission and reception system

Claims (9)

delete delete delete In the wireless power transmitter,
Antenna array and
The position detection wave radiated from the target is received through the antenna array, and the amount of the reception power of the position detection wave received by each patch antenna is compared with a preset reception power level to determine the distance and the beam width of the target, And a control unit for controlling to emit power transmission wave according to the determined distance and beam width,
The antenna array forms at least two or more antenna groups consisting of a plurality of patch antennas,
When the reception power of the position detection wave input through the reception power detection unit is greater than a preset reference power, the control unit controls each antenna group to operate sequentially, detects the amount of received power received by each antenna group, and detects the position. Determining an antenna group having the largest reception power level of the wave, and controlling the antenna group to generate a power transmission wave in a predetermined direction to the determined antenna group,
The position detection wave is a wireless power transmission apparatus, characterized in that when the target is determined to need wireless charging, the target is radiated through the power receiving antenna.
delete The method of claim 4,
When the arrival time of the first position detection wave is T1 and the arrival time of the second position detection wave is T2 (here, T1 <T2), the control unit is the first power transmission wave and the second position detection wave according to the first position detection wave. The second power transmission wave according to the wireless power transmission device, characterized in that for controlling to be radiated at a time interval of (T2-T1).
The method of claim 4,
The control unit
It emits a scanning wave within a preset irradiation range to the antenna group having the largest reception power level of the position detection wave, and resets the direction and distance of the power transmission wave using the received power information transmitted from the target. Wireless power transmitter.
The method of claim 4,
The control unit, when further receiving center distance information between a plurality of targets from a target, uses the center distance information to control the irradiation range and number of scanning waves.
The method of claim 4,
The control unit determines that the target is moving when the received power transmitted from the target changes while the target is charging by the power transmission wave, and emits a movement detection scanning wave in a predetermined direction,
When the received power information transmitted from the target by the movement detection scanning wave does not change, it is determined that the target is stopped, and the scanning waves are sequentially radiated within a preset irradiation direction range of the movement detection scanning wave radiating at the stop time. Wireless power transmitter, characterized in that.

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