KR20190060517A - Method and apparatus for dividing wireless power - Google Patents

Abstract

The present invention provides an apparatus for effectively distributing power to a plurality of target apparatuses receiving wireless power, and a method thereof. According to an embodiment of the present invention, a source apparatus comprises: a target check unit checking the number of target apparatuses and checking a performance index with the target apparatuses; a power ratio check unit checking information on a reception power ratio with regard to each of the target apparatuses; a calculation unit calculating rod resistance values of each of the target apparatuses based on the number of the target apparatuses, the performance index with each of the target apparatuses, and the reception power ratio; and a communication unit transmitting the calculated rod resistance values to the target apparatuses.

Description

[0001] METHOD AND APPARATUS FOR DIVIDING WIRELESS POWER [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technique, and more particularly, to a technique for performing a desired power distribution with maximum power efficiency in a SIMO system.

Recently, research interest in wireless power transfer (WPT) technology is to provide multiple-input multiple-output (MIMO). The MIMO WPT system is attracting attention because it enables the energy self-sufficiency of Internet of Things (IoT) sensors.

A SIMO system is a collection of single-input multiple-output (SIMO) systems.

The challenge of the SIMO system is to maximize power efficiency and achieve the desired power distribution. However, existing techniques for solving these problems are implemented with very complicated algorithms.

Korean Patent Publication No. 2016-0089778 " Impedance Matching Method for Equal Power Transmission in a Multiple Receiver Environment "

SUMMARY OF THE INVENTION The present invention is directed to an apparatus and method for efficiently distributing power to a plurality of target devices that receive radio power while maintaining a maximum overall efficiency.

According to an aspect of the present invention, there is provided a source apparatus comprising: a target verifying unit for verifying a number of target devices and confirming a figure of merit with the target devices; Calculating a load resistance value of each of the target devices based on the number of target devices, a performance index with each of the target devices, and the received power ratio; And a communication unit for transmitting the calculated load resistance values to the target devices.

A method for distributing power of a source apparatus according to an embodiment of the present invention includes: checking the number of target apparatuses and confirming a figure of merit with the target apparatuses; Calculating load resistance values of each of the target devices based on the number of target devices, a performance index with each of the target devices, and the received power ratio; To the target devices.

The power distribution system according to an embodiment of the present invention checks the number of target devices, the performance index with the target devices, and the received power ratio for each of the target devices, A source device for calculating load resistance values of the target devices based on the performance index and the received power ratio with each of the target devices and transmitting the calculated load resistance values to the target devices, And target devices that receive the load resistance value and adjust the load resistance.

A power distribution method according to an embodiment of the present invention includes: a step in which target devices transmit state information to a source device; and the source device calculates a target number of target devices, a performance index with respect to the target devices, Based on the number of target devices, a performance index with the target devices, and a received power ratio for each of the target devices, The source devices sending the calculated load resistance values to the target devices, and the target devices adjusting the load resistances based on the received load resistance values And distributing the power.

The power distribution apparatus and method according to an embodiment of the present invention can efficiently distribute power to a plurality of target apparatuses receiving wireless power while maintaining the maximum efficiency as a whole.

1 is a configuration diagram illustrating a power distribution system according to an embodiment of the present invention.
2 is a configuration diagram showing a source apparatus according to an embodiment of the present invention.
3 is a configuration diagram illustrating a target device according to an embodiment of the present invention.
4 is a sequence diagram illustrating a power distribution method according to an embodiment of the present invention.
5 is a flowchart illustrating a power distribution method of a source apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating a method of adjusting the resistance of target devices for receiving power distribution according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

As used herein, the terms "embodiment," "example," "side," "example," and the like should be construed as advantageous or advantageous over any other aspect or design It does not.

Also, the term 'or' implies an inclusive or 'inclusive' rather than an exclusive or 'exclusive'. That is, unless expressly stated otherwise or clear from the context, the expression 'x uses a or b' means any of the natural inclusive permutations.

Also, the phrase " a " or " an ", as used in the specification and claims, unless the context clearly dictates otherwise, or to the singular form, .

Furthermore, the terms first, second, etc. used in the specification and claims may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terminology used herein is a term used for appropriately expressing an embodiment of the present invention, which may vary depending on the user, the intent of the operator, or the practice of the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

1 is a configuration diagram illustrating a power distribution system according to an embodiment of the present invention.

The power distribution system can be modeled by a resistor, a capacitor, an inductor, and a power source as shown in FIG.

Referring to FIG. 1, the power distribution system includes one source device 100 and a plurality of target devices 110, 120, and 130.

The source device 100 may be a device that wirelessly transmits power to a plurality of target devices 110, 120, and 130.

)와, 인덕터(

)와, 캐패시터(

)와, 저항(

)을 포함할 수 있다.The source device 100 includes a power source

), An inductor

), A capacitor

), Resistance (

).

)에서 생성된 전력은 자기 공진 현상에 의해 소스 장치(100)와 공진을 이루는 타겟 장치들(110, 120, 130)로 전달된다.Power source (

Is transmitted to the target devices 110, 120, and 130 that resonate with the source device 100 by self-resonance phenomenon.

의 전압에 의해 전력을 공급하나, 전류에 의해 전력을 공급할 수도 있다.In Fig. 1 and the following Equation 1, the power source

But it is also possible to supply the electric power by the electric current.

)는 소정 주파수의 교류 전력을 제공하는 교류 전력 소스일 수 있다.Power source (

May be an alternating current power source providing alternating current power of a predetermined frequency.

)는 타겟 장치들(110, 120, 130)에 무선 전력을 공급할 안테나 역할을 수행할 수 있다.Inductor

May serve as an antenna to provide wireless power to the target devices 110, 120,

)는 자기 공진 방식으로 전력을 전달하기 위해 사용될 수 있다.Capacitor

) May be used to deliver power in a self-resonating manner.

)의 캐패시턴스를 조절하여 공진 주파수를 변경할 수 있다.Capacitor

) Can be adjusted to change the resonance frequency.

)은 소스 장치(100)의 손실 전력량을 나타낼 수 있다.resistance(

) May represent the amount of power loss of the source apparatus 100.

The target devices 110, 120, and 130 may be devices that receive power from the source device 100 wirelessly.

For example, it can be a variety of electronic devices requiring power such as a smart phone, a tablet, a keyboard, a mouse, and a smart TV.

)와, 캐패시터(

)와, 저항(

)과 로드 저항(

)을 포함할 수 있다. 도 1에서는

이다.The target devices 110, 120, and 130 may include an inductor

), A capacitor

), Resistance (

) And load resistance

). 1,

to be.

)는 소스 장치(100)로부터 무선 전력을 수신할 안테나 역할을 수행할 수 있다.Inductor

May serve as an antenna for receiving wireless power from the source device 100. [

)는 자기 공진 방식으로 전력을 수신하기 위해 사용될 수 있다.Capacitor

) May be used to receive power in a self-resonating manner.

)의 캐패시턴스를 조절하여 공진 주파수를 변경할 수 있다.Capacitor

) Can be adjusted to change the resonance frequency.

)은 타겟 장치 각각(110, 120, 130)의 손실 전력량을 나타낼 수 있다.resistance(

May represent the amount of power loss of each of the target devices 110, 120, and 130.

)은 타겟 장치들(110, 120, 130)간의 효율적인 전력 분배가 이루어지도록 조절될 수 있다.Load resistance

May be adjusted to achieve efficient power distribution between the target devices 110, 120,

The power distribution system according to one embodiment of the present invention calculates the load resistance value so that the source device 100 maintains the full efficiency at the maximum while achieving an efficient power distribution and outputs the calculated load resistance value to the target devices 110, , 130, respectively.

At this time, each of the target devices 110, 120, and 130 can efficiently receive power by adjusting the load resistance based on the calculated load resistance value.

To efficiently distribute power while maintaining maximum power efficiency, the following equation can be derived.

)가 공급하는 전력(

)은 하기 수학식 1과 같다.Power source (

) Supplied by the power

) ≪ / RTI >

The power consumption of the source device 100, and the power consumption of the target devices.

[Equation 1]

는 전력 소스,

는 소스 장치(100)의 전류,

는 소스 장치(100)의 저항,

는 타겟 장치의 저항,

는 타겟 장치의 로드 저항, N은 타겟 장치들의 수here,

A power source,

The current of the source device 100,

The resistance of the source device 100,

The resistance of the target device,

Is the load resistance of the target device, N is the number of target devices

)은 수학식 2와 같다.The power consumed by the load resistance of each of the target devices 110, 120, 130

) ≪ / RTI >

&Quot; (2) "

는 타겟 장치의 전류,

는 로드 저항here,

The current of the target device,

The load resistance

)은 수학식 3과 같다.Thus, the efficiency of each of the target devices 110, 120,

) ≪ / RTI >

&Quot; (3) "

)가 소스 장치(100)와 타겟 장치(110, 120, 130) 간 결합 계수(

)에 비해 상대적으로 작다면(

) 전류비는 수학식 4과 같이 표현할 수 있다. At this time, the coupling coefficient between the target devices 110, 120, and 130

) Between the source device 100 and the target devices 110, 120, 130

) Is relatively small (

) Current ratio can be expressed by Equation (4).

&Quot; (4) "

는 주파수,

는 소스 장치(100)와 타겟 장치간 결합 계수,

는 타켓 장치의 인덕터,

는 소스 장치(100)의 인덕터here,

Is the frequency,

A coupling coefficient between the source apparatus 100 and the target apparatus,

The inductor of the target device,

Gt; of the source device < RTI ID = 0.0 > 100 &

)을 하기 수학식 5와 같이 표현할 수 있다.Substituting equation (4) into equation (3), the efficiency

) Can be expressed by the following equation (5).

&Quot; (5) "

)은 타겟 장치들(110, 120, 130) 각각의 전력 효율을 합한 하기 수학식 6과 같이 표현할 수 있다.Therefore, the total power efficiency (

May be expressed as Equation (6), which is the power efficiency of each of the target devices (110, 120, 130).

&Quot; (6) "

)을 타겟 장치들(110, 120, 130) 각각의 정규화된 부하(

)로 미분하여 전체 효율이 최대가 되는 부하 조건을 구할 수 있으며, 하기 수학식 7과 같다.Total power efficiency (

To the normalized load of each of the target devices 110, 120, 130

), And the load condition in which the total efficiency is maximized can be obtained.

&Quot; (7) "

는 전체 전력 효율이 최대가 되는 정규화된 부하here,

Lt; RTI ID = 0.0 > power < / RTI >

)는 수학식 3과 수학식 6을 이용하여 하기 수학식 8로 표현할 수 있다.Therefore, in any of the target devices 110, 120, and 130,

) Can be expressed by the following equation (8) using Equations (3) and (6).

&Quot; (8) "

)의 합은 1이다.At this time, the power ratio of the target devices 110, 120, and 130

) Is 1.

)는 수학식 8에 수학식 7을 대입하여 하기 수학식 9로 표현할 수 있다.If the load resistance of each of the target devices 110, 120, and 130 satisfies the load condition in which the total power efficiency becomes the maximum, the power ratio (

) Can be expressed by Equation (9) by substituting Equation (7) into Equation (8).

&Quot; (9) "

=

)한다면(시뮬레이션을 통해 타겟 장치들(110, 120, 130) 각각의 부하 저항이 변화하더라도 전체 전력 효율이 일정하게 유지됨을 확인할 수 있다.), 수학식 8과 수학식 9를 이용하여 수학식 10을 표현할 수 있다.Assuming that the total power efficiency is maintained even if the load changes

=

(It can be confirmed that the total power efficiency is kept constant even though the load resistance of each of the target devices 110, 120, and 130 is changed through simulation), Equation (8) and Equation (9) Can be expressed.

&Quot; (10) "

로 가정하면, 임의의 타겟 장치(110, 120, 130)에서 원하는 전력비를 갖도록 하는 부하 조건을 수학식 10을 이용하여 하기 수학식 11과 같이 찾을 수 있다.At this time,

The load condition that the desired target power ratio in any of the target devices 110, 120, and 130 can be found as shown in Equation (11) using Equation (10).

&Quot; (11) "

를 곱하면, 하기 수학식 12로 표현할 수 있다.In Equation (11)

Can be expressed by the following equation (12). &Quot; (12) "

&Quot; (12) "

)을 최대로 유지하면서 원하는 전력비(

)를 갖도록 타겟 장치들(110, 120, 130) 각각의 로드 저항 값(

)을 조절하는 무선 전력 시스템을 구성할 수 있다.The overall efficiency (< RTI ID = 0.0 >

) To a desired power ratio (

) Of each of the target devices (110, 120, 130) to have a load resistance value

) Can be configured.

)이 최대를 유지 못하고 변할 수 있으나, 최대 효율을 갖는 전력비들의 근처에서 사용한다면 효율 변화나 정확도 측면에서 큰 문제없이 구현하여 사용할 수 있다.In the implementation, depending on the performance index values, the total efficiency

) Can be changed without maintaining the maximum, but if it is used near the power ratios with the maximum efficiency, it can be implemented without any problem in terms of efficiency change or accuracy.

2 is a configuration diagram showing a source apparatus according to an embodiment of the present invention.

2, the source apparatus 200 includes a target verification unit 210, a power ratio verification unit 220, a calculation unit 230, and a communication unit 240.

The target verification unit 210 confirms the number of target devices and the performance index with the target devices.

The number of target devices can be verified by requesting power from the target devices via communication, by using a sensor to sense the target device, or by using resonance characteristics for the supply of wireless power.

)는 하기 수학식으로 표현될 수 있다.Performance index with target devices (

) Can be expressed by the following equation.

)를 수신하고 결합 계수(

)를 확인하여 각 타겟 장치들과의 성능 지수(

)를 확인할 수 있다.Status information from the target devices (

) And the coupling coefficient (

) And confirms the performance index with each target device (

).

는 공진주파수,

는 소스 장치(200)의 인덕터,

는 소스 장치(200)의 저항here,

Is a resonant frequency,

The inductor of the source device 200,

The resistance of the source device 200

The power ratio confirmation unit 220 may receive power ratios determined by the amount of power required by each of the target devices, or may determine power ratios based on the number of target devices and the amount of power required by the target devices. Here, the information on the reception power ratio may mean a power ratio to be received by each of the target devices.

)들과, 전력비(

)들에 의하여 하기 수학식 12로 표현되는 타겟 장치들 각각의 로드 저항 값(

)들을 계산한다.The calculation unit 230 calculates the performance index (

), Power ratio (

) Of each of the target devices expressed by the following equation (12)

).

&Quot; (12) "

)들을 타겟 장치들이 갖는다면, 전체 효율을 최대로 유지하면서 원하는 전력비(

)를 얻을 수 있을 것이다.The thus calculated load resistance value (

), Then the desired power ratio (< RTI ID = 0.0 >

).

The derivation process for Equation (12) has been described above and is therefore omitted.

)들을 타겟 장치들 각각에 송신할 수 있다.The communication unit 240 receives the load resistance value (

) To each of the target devices.

)을 수신한 타겟 장치들은 수신한 로드 저항 값(

)에 맞추어 로드 저항을 조절하여 전체 효율을 최대로 유지하면서 원하는 전력을 얻을 수 있다.Load resistance value (

The target devices that received the received load resistance value

), The desired power can be obtained while maintaining the total efficiency at the maximum by adjusting the load resistance.

3 is a configuration diagram illustrating a target device according to an embodiment of the present invention.

Referring to FIG. 3, the target apparatus 300 includes a communication unit 310 and a control unit 320.

등의 타겟 장치(300)의 스펙 등을 의미할 수 있다.The communication unit 310 can transmit status information to the source device and receive the load resistance value calculated by the source device. State information

The specification of the target device 300, etc.

The adjuster 320 receives the load resistance value calculated by the source device and adjusts the load resistance in the target device 300. [ The load resistance can be adjusted so that the desired power can be received while maintaining the maximum efficiency.

4 is a sequence diagram illustrating a power distribution method according to an embodiment of the present invention.

Referring to FIG. 4, in step S410, target devices transmit status information to the source device.

In step S420, the source device confirms information on the number of target devices, the performance index, and the received power ratio of each of the target devices.

In step S430, the source device calculates the load resistance values based on the information on the status information of the target devices, the number of the target devices, the performance index, and the received power ratio received in step S410.

In step S440, the source device transmits the load resistance values of each of the calculated target devices to the target devices.

In step S450, the target device receives the load resistance value and adjusts the load resistance to receive the desired power.

5 is a flowchart illustrating a power distribution method of a source apparatus according to an embodiment of the present invention.

Referring to FIG. 5, in step S510, the source device confirms the number of target devices and the performance index with target devices.

In step S520, the source device confirms information on the received power ratio for each of the target devices. The information on the reception power ratio may mean a power ratio or the like to be received by each of the target devices. Alternatively, power ratios determined by the amount of power required by each of the target devices may be input.

In step S530, the source device calculates the load resistance values using the number of target devices, the performance indices with the target devices, and the power ratios.

In step S540, the source device transmits the calculated load resistance values to the target devices so as to receive the desired power.

6 is a flowchart illustrating a method of adjusting the resistance of target devices for receiving power distribution according to an embodiment of the present invention.

Referring to FIG. 6, in step S610, target devices transmit status information to a source device and receive a load resistance value.

In step S620, the target devices can receive the desired power while maintaining the maximum efficiency by adjusting the load resistance based on the received load resistance value.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA) A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

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 exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (12)

A target verifying unit for verifying the number of target devices and confirming the figure of merit with the target devices;
A power ratio confirmation unit for confirming information on a received power ratio for each of the target devices;
A calculation unit for calculating load resistance values of each of the target devices based on the number of the target devices, the performance index with respect to each of the target devices, and the received power ratio; And
And a communication unit for transmitting the calculated load resistance values to the target devices
Source device. The method according to claim 1,
Wherein the performance index with respect to the target device is expressed by the following equation (1)
[Equation 1]

here,

The performance index of the target device,

Is the coupling coefficient of the target device,

The degree of the goodness of the target device,

Of the source device
Source device. The method according to claim 1,
The calculation unit may calculate,
The load resistance values are determined according to the following equation (2)
&Quot; (2) "

here,

The load resistance of the target device,

The resistance of the target device,

The performance index of the target device,

The power ratio of the target device
Source device. Identifying the number of target devices and verifying the figure of merit with the target devices;
Identifying information about a received power ratio for each of the target devices;
Calculating load resistance values of each of the target devices based on the number of the target devices, the performance index with each of the target devices, and the received power ratio; And
And transmitting the calculated load resistance values to the target devices
A method of power distribution of a source device. 5. The method of claim 4,
Wherein the performance index with respect to the target device is expressed by the following equation (1)
[Equation 1]

here,

The performance index of the target device,

Is the coupling coefficient of the target device,

The degree of the goodness of the target device,

Of the source device
A method of power distribution of a source device. 5. The method of claim 4,
Wherein calculating the load resistance values comprises:
According to the following equation (2)
&Quot; (2) "

here,

The load resistance of the target device,

The resistance of the target device,

The performance index of the target device,

The power ratio of the target device
A method of power distribution of a source device. The target number of target devices, the performance index with respect to the target devices, and the received power ratio for each of the target devices. The number of target devices, the performance index with respect to each of the target devices, A source device for calculating load resistance values of the target devices based on a received power ratio, and transmitting the calculated load resistance values to the target devices; And
Target devices to transmit status information to the source device, receive the load resistance value, and adjust the load resistance
Power distribution system. 8. The method of claim 7,
Wherein the performance index with respect to the target device is expressed by the following equation (1)
[Equation 1]

here,

The performance index of the target device,

Is the coupling coefficient of the target device,

The degree of the goodness of the target device,

Of the source device
Power distribution system. 8. The method of claim 7,
Wherein the source device comprises:
Calculating load resistance values by the following equation (2)
&Quot; (2) "

here,

The load resistance of the target device,

The resistance of the target device,

The performance index of the target device,

The power ratio of the target device
Power distribution system. The target devices sending status information to the source device;
Confirming information about the number of the target devices, the performance index with the target devices, and the received power ratio for each of the target devices;
Calculating load resistance values of each of the target devices based on a number of the target devices, a performance index with the target devices, and a received power ratio for each of the target devices;
The source device sending the calculated load resistance values to the target devices; And
And the target devices adjusting the load resistances based on the received load resistance values to distribute power. 11. The method of claim 10,
Wherein the performance index with respect to the target device is expressed by the following equation (1)
[Equation 1]

here,

The performance index of the target device,

Is the coupling coefficient of the target device,

The degree of the goodness of the target device,

Of the source device
Power distribution method. 11. The method of claim 10,
Wherein calculating the load resistance values comprises:
According to the following equation (2)
&Quot; (2) "

here,

The load resistance of the target device,

The resistance of the target device,

The performance index of the target device,

The power ratio of the target device
Power distribution method.

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