KR102386094B1 - Microwave wireless power transmission method and apparatus thereof - Google Patents

Abstract

The present invention comprises the steps of: acquiring electromagnetic field data inside the human body corresponding to the user's location; detecting channel response data between an array antenna of a wireless power transmitter and the wireless power receiver based on a pilot signal received from the wireless power receiver; determining a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data; and transmitting the determined wireless power signal to the wireless power receiver.

Description

MICROWAVE WIRELESS POWER TRANSMISSION METHOD AND APPARATUS THEREOF

The present invention relates to a microwave wireless power transmission method and apparatus, and more particularly, to a microwave wireless power transmission method and apparatus in consideration of human safety.

Recently, as the use of low-power and ultra-small wireless devices in the fields of mobile terminals, Internet of Things (IoT), sensors, and bioimplantation devices is increasing, the demand for long-distance wireless power transmission and charging is increasing.

Wireless power transmission technology is largely divided into a short-distance method using a magnetic field and a long-distance method using radio waves. In short-distance wireless power transmission, power is transmitted through a magnetic induction method using a coil and a magnetic resonance method using a resonance circuit, and the efficiency decreases rapidly as the distance increases. In contrast, in the long-distance wireless power transmission, medium/long-distance power transmission is possible by radiating electromagnetic waves through an antenna. Array antenna-based beamforming is used to focus wireless power to a desired point, but beamforming is inefficient when there are many obstacles or a single antenna is used. Therefore, in a complicated radio wave environment such as an indoor environment, there is a limitation in radio wave focusing with the conventional method of long-distance wireless power transmission. In order to compensate for this limitation, a wireless power transmission technology based on a time reversal (TR) method has been recently proposed.

In general, since the TR method has the maximum transmission efficiency if the human body effect is not taken into consideration in real situations, it is the optimal wireless power transmission method among the known wireless power transmission methods. However, electromagnetic waves can be dangerous to the human body by generating heat in the body, and when a wireless power transmission system is used close to the human body, it is more dangerous than other wireless devices because the transmitter of the system uses high power. Therefore, there is a need for a technology for transmitting a lot of power in consideration of human safety in the design process of the wireless power transmission system. However, there is no wireless power transmission technology or research in consideration of the effects of electromagnetic waves on the human body so far.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object is to provide a microwave wireless power transmission method and apparatus capable of determining an optimal wireless power signal in consideration of human safety based on a predetermined optimization algorithm and transmitting the determined wireless power signal to a wireless power receiver. is in

Another object is to provide a microwave wireless power transmission method capable of transmitting optimal wireless power in consideration of human safety to the wireless power receiver using channel response data between an array antenna and a wireless power receiver and electromagnetic field data inside the human body, and to provide the device.

According to one aspect of the present invention to achieve the above or other object, the method comprising: acquiring electromagnetic field data inside the human body corresponding to the location of the terminal user; detecting channel response data between an array antenna of a wireless power transmitter and the wireless power receiver based on a pilot signal received from the wireless power receiver; determining a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data; and transmitting the determined wireless power signal to the wireless power receiver. Here, the electromagnetic field data inside the human body is characterized in that it is acquired in advance through EM (Electromagnetic) simulation.

More preferably, the acquiring step further comprises the step of detecting the location of the terminal user existing in the vicinity of the wireless power transmitter using a human body detector.

More preferably, the determining step is characterized in that the phase of the wireless power signal to be transmitted from each antenna element is determined using the channel response data between the array antenna and the wireless power receiver.

More preferably, the determining step is characterized in that the amplitude of the wireless power signal to be transmitted from each antenna element is determined using a predetermined optimization algorithm. Here, the predetermined optimization algorithm is characterized in that it is a convex optimization algorithm.

More preferably, the objective function of the convex optimization algorithm is characterized in that the wireless power receiver is set to a maximum value of the wireless power received from the wireless power transmitter. The limiting condition applied to the objective function is characterized in that it includes a specific absorption rate (SAR) inside the human body and a transmission power of the wireless power transmitter.

According to another aspect of the present invention, a human body detection unit for detecting the location of the terminal user; a memory for storing electromagnetic field data inside the human body according to the location of the terminal user; a channel response detector configured to detect channel response data between an array antenna and the wireless power receiver based on a pilot signal received from the wireless power receiver; and a control unit configured to determine a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data of the human body.

According to another aspect of the present invention, the process of acquiring electromagnetic field data inside the human body corresponding to the location of the terminal user; detecting channel response data between an array antenna of a wireless power transmitter and the wireless power receiver based on a pilot signal received from the wireless power receiver; determining a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data; and a computer program stored in a computer-readable recording medium so that the process of transmitting the determined wireless power signal to the wireless power receiver is executed on a computer.

The effect of the microwave wireless power transmission method and the apparatus according to the embodiments of the present invention will be described as follows.

According to at least one of the embodiments of the present invention, by transmitting the optimal wireless power signal using the channel response data between the array antenna and the wireless power receiver and the electromagnetic field data inside the human body according to the position of the person, It has the advantage of being able to transmit maximum wireless power to the wireless power receiver while satisfying human safety regulations.

In addition, according to at least one of the embodiments of the present invention, by providing a wireless power transmission method using a predetermined optimization algorithm, it is applicable in all scenario environments of wireless power transmission, high-speed charging is possible, and is better than the existing TR method. There is an advantage that a lot of power can be transmitted to the wireless power receiver.

However, the microwave wireless power transmission method and the effects that can be achieved by the apparatus according to the embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned are from the description below. It will be clearly understood by those of ordinary skill in the art.

1 is a diagram showing the configuration of a wireless power transmission system according to an embodiment of the present invention;
2 is a diagram showing the configuration of a wireless power transmitter according to an embodiment of the present invention;
3 is a flowchart illustrating a method of acquiring electromagnetic field data inside a human body according to an embodiment of the present invention;
4 is a flowchart illustrating a wireless power transmission method according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

In this application, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, in this application, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more It is to be understood that this does not preclude the possibility of addition or presence of other features or numbers, steps, operations, components, parts, or combinations thereof.

The present invention proposes a microwave wireless power transmission method and apparatus capable of determining an optimal wireless power signal in consideration of human safety based on a predetermined optimization algorithm and transmitting the determined wireless power signal to a wireless power receiver. In addition, the present invention provides a microwave wireless power transmission method capable of transmitting optimal wireless power in consideration of human safety to the wireless power receiver using channel response data between an array antenna and a wireless power receiver and electromagnetic field data inside the human body, and suggest the device.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

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

Referring to FIG. 1 , a wireless power transmission system 100 according to an embodiment of the present invention includes a wireless power transmission device 110 for transmitting wireless power using microwaves and a wireless power reception device for receiving the wireless power. device 120 . In this case, the wireless power transmitter 110 and the wireless power receiver 120 may be located indoors or outdoors. Hereinafter, in the present specification, the wireless power transmitter 110 and the wireless power receiver 120 will be described by exemplifying that they are positioned indoors.

The wireless power transmitter 110 may transmit a wireless power signal using an array antenna including a plurality of antenna elements arranged in a predetermined pattern.

The wireless power transmitter 110 has a channel response between the antenna elements constituting the array antenna and the wireless power receiver 120 based on a pilot signal received from the wireless power receiver 120 . can be obtained.

The wireless power transmitter 110 determines an optimal wireless power signal in consideration of the safety of the human body based on a predetermined optimization algorithm (eg, a convex optimization algorithm), and transmits the determined wireless power signal to the wireless power receiver ( 120) can be transmitted. At this time, the wireless power transmitter 110 uses the channel response data between the array antenna and the wireless power receiver 120 and the electromagnetic field data inside the human body according to the position of the person to provide an optimal wireless power signal considering the safety of the human body. can decide

The wireless power receiver 120 may receive a wireless power signal from the wireless power transmitter 110 using an array antenna including a plurality of antenna elements arranged in a predetermined pattern. Meanwhile, in another embodiment, the wireless power receiver 120 may receive a wireless power signal using a single antenna instead of an array antenna.

The wireless power receiver 120 may generate a pilot signal having the same frequency band or a different frequency band as the wireless power signal and transmit it to the wireless power transmitter 110 . In this case, the pilot signal may be used in the wireless power transmitter 110 to detect a channel response characteristic between the array antenna and the wireless power receiver 120 . Also, the pilot signal may be used to track the location of the wireless power receiver 120 in the wireless power transmitter 110 .

Such a wireless power receiver 120 is mounted on various electronic devices such as a mobile terminal, a fixed terminal, an Internet of Things (IoT), a sensor, a portable medical device and a bioimplantation device disposed adjacent to the user 130, It can be used for charging power.

2 is a diagram showing the configuration of a wireless power transmitter according to an embodiment of the present invention.

Referring to FIG. 2 , the wireless power transmitter 200 according to an embodiment of the present invention includes a signal generator 210 , a signal preprocessor 220 , a signal distribution unit 230 , an RF signal processor 240 , and an arrangement. It includes an antenna 250 , a human body detector 260 , a channel response detector 270 , a memory 280 , and a controller 290 . The components shown in FIG. 2 are not essential in implementing the wireless power transmitter, so the wireless power transmitter described in this specification may have more or fewer components than those listed above.

The signal generator 210 may generate a reference signal for transmitting wireless power to the wireless power receiver 120 . In this case, the signal generator 210 may generate a reference signal having a predetermined micro-frequency band. Also, the signal generator 210 may generate a reference signal having a predetermined power intensity according to a power control command of the controller 290 .

The signal preprocessor 220 may include a mixer and a high power amplifier (HPA). The signal preprocessor 220 may change the frequency of the reference signal received from the signal generator 210 through the mixer. Thereafter, the signal preprocessor 220 may amplify the amplitude (or strength) of the frequency-changed reference signal through the high-power amplifier HPA. On the other hand, the signal preprocessor 220 is not an essential component of the present invention and may be configured to be omitted depending on the embodiment.

The signal splitter 230 may branch one reference signal received from the signal generator 210 or the signal preprocessor 220 into a plurality of wireless power signals and output it to the RF signal processor 240 .

The RF signal processing unit 240 may include a plurality of RF signal processing units 245 respectively corresponding to the plurality of antenna elements 255 constituting the array antenna 250 . Here, each RF signal processing unit 245 may include a phase shifter (PS) and a high-power amplifier (HPA).

Each RF signal processing unit 245 may adjust the phase of the wireless power signal through the phase shifter PS according to the phase control command of the controller 290 . In addition, each RF signal processing unit 245 may adjust the amplitude of the wireless power signal through the high-power amplifier according to the power control command of the controller 290 .

The array antenna 250 may include a plurality of antenna elements 255 arranged in a predetermined pattern. Each antenna element 255 may radiate a wireless power signal received from the RF signal processing unit 245 corresponding thereto. In addition, each antenna element 255 may receive a pilot signal transmitted from the wireless power receiver 120 .

The human body detector 260 may detect the location of a person (ie, a user using the electronic device) that exists in the vicinity of the wireless power transmitter 200 . To this end, the human body detection unit 260 may include a camera, a radar, an infrared sensor, an ultrasonic sensor, and the like.

The channel response detector 270 may detect a channel response between the antenna elements 255 of the array antenna 250 and the wireless power receiver 120 based on a pilot signal received through the array antenna 250 . .

The memory 280 stores data supporting the function of the wireless power transmitter 200 . For example, the memory 280 may store electromagnetic field data inside the human body according to the location of a person present in a specific place. In this case, the electromagnetic field data inside the human body may be acquired and stored in advance through electromagnetic (EM) simulation.

The memory 280 may store an application program driven by the wireless power transmitter 200 , data for an operation of the wireless power transmitter 200 , and commands. For example, the memory 280 may store information on an optimization algorithm for transmitting optimal wireless power while considering human safety. In this case, the optimization algorithm may be a convex optimization algorithm, but is not limited thereto.

The controller (or processor, 290 ) may control the overall operation of the wireless power transmitter 200 . In addition, the controller 290 may control at least some of the components included in the wireless power transmitter 200 in order to drive an application program stored in the memory 280 .

The controller 290 acquires the channel response data between the array antenna 250 and the wireless power receiver 120 and the electromagnetic field data inside the human body according to the position of the person, and uses the acquired data to control the array antenna 250 . It is possible to determine an optimal wireless power signal to be transmitted from each antenna element.

As described above, the wireless power transmitter according to an embodiment of the present invention uses the channel response data between the array antenna and the wireless power receiver and the electromagnetic field data inside the human body according to the position of the person to provide an optimal wireless power signal. By transmitting, it is possible to transmit the maximum reactive power to the wireless power receiver while satisfying human safety regulations required by international organizations.

3 is a flowchart illustrating a method of acquiring electromagnetic field data inside a human body according to an embodiment of the present invention.

Referring to FIG. 3 , the operator of the wireless power transmission system drives the EM simulator capable of analyzing the electromagnetic field inside the human body ( S310 ). The EM simulator may be an application program installed on a computer or the like.

The EM simulator sets a specific place where the wireless power transmitter is to be installed according to a control command of a system operator, etc. (S320). In this case, the specific place may be an indoor space or an outdoor space.

The EM simulator sets an initial position of a specific place to acquire electromagnetic field data inside the human body according to a control command of a system operator, etc. (S330). That is, the EM simulator sets the initial position of a person to be acquired of the electromagnetic field data.

The EM simulator simulates sequentially transmitting a unit voltage signal from a plurality of antenna elements constituting the array antenna of the wireless power transmitter (S340). In this case, the unit voltage signal may be a sine wave signal having a magnitude of 1V, but is not limited thereto.

The EM simulator acquires electromagnetic field data generated inside a human body existing at a specific location due to a unit voltage signal transmitted from each antenna element (S350).

The EM simulator stores the electromagnetic field data inside the human body for each antenna element in the memory (S360). The electromagnetic field data inside the human body stored in the memory is later used in a wireless power transmitter to determine an optimal wireless power signal in consideration of human safety.

The EM simulator checks whether the electromagnetic field data inside the human body has been acquired at all locations in a specific place (S370).

As a result of checking in step 370, if the electromagnetic field data inside the human body is not acquired at all locations of the specific place, the EM simulator changes the location of the person who will acquire the electromagnetic field data inside the human body (S380). Thereafter, the EM simulator performs the operations of steps 340 to 360 described above. This process may be repeated until the electromagnetic field data inside the human body is acquired at all locations in a specific place.

Meanwhile, as a result of checking in step 370, when the electromagnetic field data inside the human body is acquired from all positions of the specific place, the EM simulator ends the process of acquiring the electromagnetic field data inside the human body.

In this way, by driving the EM simulator, it is possible to acquire electromagnetic field data inside the human body according to a person's location in a specific place, and the obtained electromagnetic field data can be provided and used as a wireless power transmitter.

4 is a flowchart illustrating a wireless power transmission method according to an embodiment of the present invention.

Referring to FIG. 4 , the wireless power transmitter 200 according to the present invention may detect the location of a user existing in the vicinity by using the human body detector 260 ( S410 ). In this case, the human body detection unit 260 may include a camera, a radar, an infrared sensor, an ultrasonic sensor, and the like.

The wireless power transmitter 200 may acquire electromagnetic field data inside the human body corresponding to the user's location from the memory 280 (S420). The electromagnetic field data stored in the memory 280 may be acquired in advance through the above-described EM simulation.

The wireless power transmitter 200 may receive a pilot signal transmitted from the wireless power receiver 120 through a plurality of antenna elements constituting the array antenna 250 (S430). In this case, the pilot signal may be a sinusoidal signal having a unit voltage level (eg, 1V), but is not limited thereto.

The wireless power transmitter 200 detects channel response data between the plurality of antenna elements constituting the array antenna 250 and the wireless power receiver 120 based on the pilot signal received from the wireless power receiver 120 . It can be done (S440).

The wireless power transmitter 200 may determine an optimal phase of a wireless power signal to be transmitted from each antenna element using the channel response data between each antenna element and the wireless power receiver (S450). More specifically, the wireless power transmitter 200 detects the phase of the channel response data between each antenna element and the wireless power receiver, and obtains a phase opposite to the detected phase (that is, a value having an opposite phase sign). It can be determined as the optimal phase of the wireless power signal to be transmitted from each antenna element.

The wireless power transmitter 200 may determine the optimal amplitude of the wireless power signal to be transmitted from each antenna element constituting the array antenna by using a predetermined optimization algorithm (S460). In this case, the predetermined optimization algorithm may be a convex optimization algorithm, but is not necessarily limited thereto.

In general, the optimization problem refers to a problem of finding an optimal value or a value close to the optimal solution among several selectable candidates. In general, in the field of machine learning, a parameter (or variable) of a model that minimizes or maximizes a cost function is obtained, which can be defined as an optimization problem.

A convex optimization problem is one of these optimization problems. The convex optimization algorithm refers to a technique for finding the maximum or minimum value by defining a problem as a convex function. The convex optimization algorithm applied to the present invention satisfies the limited electromagnetic wave absorption and transmission power and transmits the maximum power to the wireless power receiver. A variable to be obtained through such a convex optimization algorithm is the amplitude of a wireless power signal to be transmitted from each antenna element of the wireless power transmitter.

The target function of such a convex optimization algorithm may be set to a maximum value of wireless power that the wireless power receiver receives from the wireless power transmitter. Accordingly, the objective function f may be defined as in Equation 1 below. For reference, since the resistance (R) in the wireless power receiver is a fixed value, it does not affect the maximization of the received wireless power. In Equation 1 below, the resistance (R) component is omitted from the power calculation formula to simplify the formula.

는 무선전력 수신장치가 무선전력 송신장치로부터 수신하는 무선전력신호의 전압으로서, 아래 수학식 2와 같이 표현될 수 있다. 그리고,

는 무선전력 송신장치의 배열 안테나에서 전송하는 무선전력신호의 진폭으로서 아래 수학식 3과 같이 표현될 수 있다.here,

is the voltage of the wireless power signal received by the wireless power receiver from the wireless power transmitter, and can be expressed as in Equation 2 below. And,

is the amplitude of the wireless power signal transmitted from the array antenna of the wireless power transmitter can be expressed as in Equation 3 below.

는 N번째 송신 안테나와 무선전력 수신장치 간의 채널 응답(channel response)이고,

는 N번째 송신 안테나에서 전송하는 무선전력 신호의 진폭임.here,

is the channel response between the N-th transmit antenna and the wireless power receiver,

is the amplitude of the wireless power signal transmitted from the Nth transmit antenna.

The limiting conditions applied to the objective function (f) of the convex optimization algorithm are the Specific Absorption Rate (SAR) inside the human body and the transmission power of the wireless power transmitter. The limited electromagnetic wave absorption rate may be defined as Equation 4 below, and the transmission power of the limited wireless power transmitter may be defined as Equation 5 below.

은 전자파 흡수율의 계산식,

는 IEEE에 의해 허용된 최대 전자파 흡수율,

는 인체 내부의 위치 r에서의 전기장,

는 인체의 밀도,

는 인체의 전기 전도도임.here,

is the calculation formula of the electromagnetic wave absorption rate,

is the maximum absorption rate allowed by IEEE,

is the electric field at position r inside the human body,

is the density of the human body,

is the electrical conductivity of the human body.

은 무선전력 송신장치의 배열 안테나에서 전송하는 총 송신 전력의 계산식,

는 최대 송신 파워, R은 무선전력 송신장치의 배열 안테나의 radiation 저항,

임. here,

is the calculation formula of the total transmit power transmitted from the array antenna of the wireless power transmitter,

is the maximum transmit power, R is the radiation resistance of the array antenna of the wireless power transmitter,

lim.

)을 결정할 수 있다.The optimal amplitude (

) can be determined.

The wireless power transmitter 200 may transmit wireless power signals having optimal phase and amplitude values determined through the above-described process using a plurality of antenna elements constituting the array antenna (S470). Accordingly, the wireless power transmitter 200 can transmit the maximum wireless power to the wireless power receiver while satisfying human safety regulations.

As described above, in the wireless power transmission method according to an embodiment of the present invention, an optimal wireless power signal is obtained by using the channel response data between the array antenna and the wireless power receiver and the electromagnetic field data inside the human body according to the position of the person. By transmitting, it is possible to transmit the maximum reactive power to the wireless power receiver while satisfying human safety regulations required by international organizations.

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is this. In addition, the computer may include the control unit 180 of the terminal. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

100: wireless power transmission system 110/200: wireless power transmission device
120: wireless power receiver 210: signal generator
220: signal preprocessor 230: signal distribution unit
240: RF signal processing unit 250: array antenna
260: human body detection unit 270: channel response detection unit
280: memory 290: control unit

Claims (10)

acquiring electromagnetic field data inside a human body corresponding to a location of a user using an electronic device;
detecting channel response data between an array antenna of a wireless power transmitter and the wireless power receiver based on a pilot signal received from a wireless power receiver included in the electronic device;
determining a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data; and
Transmitting the determined wireless power signal to the wireless power receiver,
In the determining step, the phase of the wireless power signal to be transmitted from each antenna element is determined using the detected channel response data, and transmitted from each antenna element using a predetermined optimization algorithm in consideration of the electromagnetic field data inside the human body. A wireless power transmission method in a wireless power transmission device, characterized in that determining the amplitude of the wireless power signal. According to claim 1,
The wireless power transmission method in the wireless power transmitter, characterized in that the electromagnetic data inside the human body is acquired in advance through EM (Electromagnetic) simulation. According to claim 1, wherein the obtaining step,
The wireless power transmission method in the wireless power transmission device, characterized in that it further comprises the step of detecting the location of the user existing in the vicinity of the wireless power transmission device by using a human body detection unit. According to claim 1, wherein the determining step,
A wireless power transmission method in a wireless power transmitter, characterized in that detecting a phase of the detected channel response data, and determining a phase opposite to the detected phase as a phase of a wireless power signal to be transmitted from each antenna element. delete According to claim 1,
The wireless power transmission method in the wireless power transmitter, characterized in that the predetermined optimization algorithm is a convex (convex) optimization algorithm. 7. The method of claim 6,
The objective function of the convex optimization algorithm is set to a maximum value of wireless power that the wireless power receiver receives from the wireless power transmitter. 8. The method of claim 7,
The limiting condition applied to the objective function includes a specific absorption rate (SAR) inside the human body and a transmission power of the wireless power transmitter. A computer program stored in a computer-readable recording medium so that the method according to any one of claims 1 to 4, 6 to 8 is executed on a computer. a human body detecting unit detecting a location of a user using the electronic device;
a memory for storing electromagnetic field data inside the human body according to the user's location;
a channel response detector configured to detect channel response data between an array antenna and the wireless power receiver based on a pilot signal received from the wireless power receiver included in the electronic device; and
A control unit for determining a wireless power signal to be transmitted from each antenna element constituting the array antenna by using the internal electromagnetic field data and the channel response data of the human body;
The control unit determines the phase of the wireless power signal to be transmitted from each antenna element using the detected channel response data, and uses a predetermined optimization algorithm in consideration of the electromagnetic field data inside the human body to be transmitted from each antenna element. Wireless power transmitter, characterized in that for determining the amplitude of the power signal.

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