KR102024866B1 - Adaptive wireless power transmission method and system - Google Patents

Abstract

The present invention relates to a wireless power transmission method in energy harvesting, the AP (Access Point), the request for the transmission of data from the receiver, the AP, in consideration of the transmission request of the data, Setting a size of data to be transmitted to a receiver, wherein the AP transmits data to the receiver at the size of the set data.
Through the adaptive wireless power transmission method and system of the present invention, the harvesting efficiency can be maximized by adjusting the power by adjusting the data transmission amount according to the state of charge of the device. In addition, the adaptive wireless power transmission method and system proposed by the present invention may enable resource allocation according to the state of charge of the device in the communication between the IoT apparatus and the AP in an energy harvesting environment.

Description

Adaptive wireless power transmission method and system {ADAPTIVE WIRELESS POWER TRANSMISSION METHOD AND SYSTEM}

The present invention relates to a method and a system for adaptive wireless power transmission, and more particularly, to a method and system for adjusting a data amount of a transmitter variably according to the remaining charge of a receiver in an RF-based wireless power transmission system.

Tablet PCs, wearable devices, and smartphones generally use the voltage charged in the battery as an energy source. Recently, however, the user's life patterns have shifted to smartphones, and accordingly, various types of applications have been developed, and thus the user's terminal usage time and data traffic volume have increased rapidly. Increased dramatically.

Therefore, research on a new type of wireless charging method besides wired charging and a battery was required. To this end, recently, a study on RF energy harvesting technology that wirelessly receives RF signals from devices that transmit RF signals in the vicinity, such as communication base stations or APs for advertisement transmission, and converts them into energy sources of receivers. Is actively underway.

Energy Harvesting technology refers to a technology for harvesting, converting, and converting energy that is thrown away from the surrounding energy into usable energy. The energy harvesting technology can not only significantly improve energy efficiency of electronic devices, but also add additional energy. It refers to a technology that enables electronic devices to be driven independently by using ambient energy without supplying energy. In this regard, a wireless power transmission technology using RF (Radio Frequency) has been developed to transmit power generated by solar power generation outside the atmosphere to the earth.

In general, RF energy harvesting techniques are commonly referred to as energy harvesting using the environment. A transmitting device that wants to deliver energy transmits a signal having a specific size of power on a frequency, and the receiving device receives and converts it into energy.

In this case, a separate RF signal for harvesting may be used, and harvesting using an RF signal emitted in a daily environment is also possible. In the former case, since all the power of the RF signal is used for harvesting, the harvesting efficiency is excellent, but since a separate resource allocation for harvesting is required, resource use for data communication may occur.

On the other hand, due to the enormous increase in the spread of mobile devices such as smartphones, the expansion of the wireless Internet environment, and the introduction of RFID (Radio-Frequency IDentification) systems, RF energy in the UHF band and the microwave band is particularly utilized in urban spaces. The reality is that much of this is wasted.

Therefore, RF energy harvesting technology has been developed that harvests RF energy and uses it as electrical energy. However, the present situation has not been realized to a satisfactory effect.

An object of the present invention is to provide a method and system for improving resource efficiency by charging a device adaptively according to a charging state of an IoT device in an energy harvesting IoT network.

In order to solve the above technical problem, the present invention provides a wireless power transmission method in energy harvesting, the AP (Access Point), the request for the transmission of data from the receiver, the AP, the In consideration of the transmission request, setting a size of data to be transmitted to the receiver and transmitting, by the AP, data to the receiver at the size of the set data.

In addition, when the AP receives a request for data transmission from the receiver, when the charging rate of the receiver is less than or equal to a set value, the AP is requested to increase the size of the data and to transmit the data, and the charging rate of the receiver exceeds the set value. If so, the size of the data to be transmitted is characterized in that the request to transmit.

Also, in the AP setting the size of data to be transmitted to the receiver in consideration of the request for transmitting the data, when the AP is requested to increase the size of the data from the receiver, the frame of data to be transmitted is transmitted. The dummy data is inserted into an empty frame, and the data size is increased.

In addition, when the AP sets the size of data to be transmitted to the receiver in consideration of the request for transmitting the data, when the AP is requested to reduce the size of the data from the receiver, the frame of data to be transmitted is transmitted. The data size may be reduced by removing dummy data inserted into the data.

In addition, the step of transmitting the data determined in consideration of the charging rate to the receiver is characterized in that it is performed in the manner of Simultaneous Wireless Information and Power Transfer (SWIPT).

The receiver may include a data request unit for requesting data from the AP in consideration of the charging rate of the receiver.

Through the adaptive wireless power transmission method and system of the present invention, the harvesting efficiency can be maximized by adjusting the power by adjusting the data transmission amount according to the state of charge of the device.

In addition, the adaptive wireless power transmission method and system proposed by the present invention may enable resource allocation according to the state of charge of the device in the communication between the IoT apparatus and the AP in an energy harvesting environment.

In addition, through the data frame method proposed in the present invention, it is possible to effectively set the data size according to the charging state of the receiver.

However, the effects that the adaptive wireless power transmission method and system according to embodiments of the present invention can achieve are not limited to those mentioned above, and other effects not mentioned are described in the following description. It will be clearly understood by those skilled in the art.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.
1 illustrates an RF energy harvesting method in the form of Simultaneous Wireless Information and Power Transmission (SWIPT) for simultaneously transmitting power and information using an RF signal used by a user for data communication according to the present invention. Conceptual diagram.
2 is a flowchart illustrating a wireless power transmission method in energy harvesting according to the present invention.
3 is a flowchart illustrating a data transmission request process according to the charging rate in the receiver 200.
FIG. 4A illustrates a general data frame 300 and FIG. 4B illustrates a data frame 310 into which dummy data is inserted.
5 is a block diagram illustrating a configuration of a receiver 200 that performs energy harvesting with the AP 100.

The following description may be made in various ways and have a variety of embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the technology described below to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the technology described below.

The terms first, second, A, B, etc. may be used to describe various components, but the components are not limited by the terms, but merely for distinguishing one component from other components. Only used as For example, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component without departing from the scope of the technology described below. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It is to be understood that the present invention means that there is a part or a combination thereof, and does not exclude the presence or addition possibility of one or more other features or numbers, step operation components, parts or combinations thereof.

Prior to the detailed description of the drawings, it is to be clear that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by. Therefore, the presence or absence of each component described through this specification should be interpreted functionally, and for this reason, the configuration described below will be different from the corresponding drawings within the limits to achieve the object of the technology described below. Make it clear.

In addition, in carrying out the method or operation method, each process constituting the method may occur differently from the stated order unless the context clearly indicates a specific order. That is, each process may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order. Hereinafter, an adaptive wireless power transmission method and system will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram illustrating an RF energy harvesting method in the form of Simultaneous Wireless Information and Power Transmission (SWIPT) in which power and information are simultaneously transmitted using an RF signal used by a user for data communication.

In general, the receiver 200 receives power from the terminal battery, but may receive power as well as wireless information from a signal received from the AP 100. Through this method, the receiver 200 may enable energy harvesting on its own. The present invention assumes RF energy harvesting in the form of simultaneous wireless information and power transmission (SWIPT) as shown in FIG.

2 is a flowchart illustrating a wireless power transmission method in energy harvesting according to the present invention.

In the wireless power transmission method in energy harvesting according to the present invention, the AP (Access Point) is requested to transmit data from the receiver (S100), the AP, considering the transmission request of the data To set the size of the data to be transmitted to the receiver (S200), the AP transmits the data to the receiver 200 in the size of the set data (S300).

In step S100, the receiver 200 requests data transmission from the AP 100 in consideration of the charging rate of the receiver 200. Here, the receiver 200 is capable of wireless charging such as an IoT device, a wearable device, and the like, and includes a device capable of transmitting data with the AP 100. The AP 100 may be an AP 100 capable of transmitting / receiving with the receiver 200 through Wi-Fi, ZigBee, or Bluetooth. A detailed description will be described later with reference to FIG. 3.

In step S200, when the AP 100 receives a data transmission request for charging from the receiver 200, the AP 100 sets the size of data to be transmitted in consideration of this. Setting the size of data is implemented by inserting or removing dummy data in an empty frame in the data frame 300. Detailed description will be described later.

In step S300, the AP 100 transmits data having a size set by the AP 100 to the receiver 200. When the size of the transmitted data is large, power is also increased accordingly, so that the receiver 200 can be charged more.

3 is a flowchart illustrating a data transmission request process according to the charging rate in the receiver 200.

When the receiver 200 determines that the charging rate of the receiver 200 is equal to or less than a set value, the receiver 200 requests the AP 100 to increase the size of data and transmit the data. At this time, the AP 100 transmits the data having increased size to the receiver 200 by increasing the size of data to be transmitted to the receiver 200 in consideration of the transmission request.

Thereafter, when charging is performed and it is determined that the amount of charge in the wireless charger exceeds the set value, the AP 100 transmits a stop signal to reduce the size of the data and transmit the request. At this time, when the AP 100 receives the stop signal, the AP 100 transmits the reduced data to the receiver 200 by reducing the size of data to be transmitted to the receiver 200 in consideration of the transmission request.

FIG. 4A illustrates a general data frame 300, and FIG. 4B illustrates a data frame 310 into which dummy data 315 is inserted.

The data frame 300 has an empty slot for each frame. Since the power is increased in proportion to the size of the data, if the data is transmitted to the receiver 200 by increasing the size of the data, the charging rate of the receiver 200 may be improved.

In order to increase the size of the data, dummy data 315 may be inserted into an empty slot of the data frame 300. When the dummy data 315 is inserted into the data frame 300, the size of the data becomes large, thereby increasing the power. When the receiver 200 receives the data 315 into which the dummy data is inserted, the charging rate of the receiver 200 increases. In one embodiment, the dummy data 315 to be inserted may be "1".

Thereafter, when it is determined that the charging rate of the receiver 200 exceeds a set value, the receiver 200 may request the AP 100 to reduce the size of data to be transmitted.

In order to reduce the size of the data, dummy data 315 inserted into a slot of the data frame 300 may be removed. When the dummy data 315 is removed from the data frame 310 into which the dummy data 315 is inserted, the size of the data is reduced, thereby reducing the power. When the receiver 200 receives the data 315 from which the dummy data has been removed, the charging rate is reduced compared to receiving the data when the dummy data 315 is inserted.

The process of transmitting data to the receiver by increasing or decreasing the size of data according to the charging rate of the receiver 200 may be performed in real time according to the charging rate of the receiver 200. In conclusion, by adjusting the size of the data transmitted according to the charging rate of the receiver 200, it is possible to adaptively adjust the amount of charge in the receiver 200.

5 is a block diagram illustrating a configuration of a receiver 200 that performs energy harvesting with the AP 100.

The receiver 200 performing energy harvesting with the AP 100 may include a data request module 210, a communication module 220, an energy harvesting module 230, and a dynamic resource energy scheduler module 240. .

The AP 100 exchanges data with the communication module 220 which is one component of the receiver 200. The data request module 210 determines the charging rate of the receiver 200 and determines whether to request the AP 100 to increase or transmit the data by increasing the size of the data.

When the determination result is notied to the communication module 220, the communication module 220 performs a data transmission request in which the determination result is reflected to the AP 100. On the other hand, the charge rate setting value (reference value) of the receiver 200 serving as a reference for the data request can be appropriately changed as necessary.

While the exemplary embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

100: AP (Access Point)
200: receiver
210: data request module 220: communication module
230: energy harvesting module
240: dynamic resource energy scheduler module
300: data frame
310: data frame in which dummy data is inserted
315: dummy data

Claims (6)

In the wireless power transmission method in energy harvesting,
An access point (AP) receiving a request for transmission of data from a receiver;
Setting, by the AP, the size of data to be transmitted to the receiver in consideration of the request for transmitting the data; And
Transmitting, by the AP, data to the receiver at the size of the set data;
Including,
The access point (AP) is requested to transmit data from a receiver, when the charging rate of the receiver is less than or equal to a set value, the AP is requested to increase the size of the data and transmit the data, and the charging rate of the receiver exceeds the set value. Is requested to reduce the size of the data to be transmitted,
The AP may set the size of data to be transmitted to the receiver in consideration of the request for transmitting the data, when the AP is requested to increase the size of the data from the receiver, and among the frames of the data to be transmitted. Insert dummy data into an empty frame to increase data size, and when the AP is requested to transmit by reducing the size of data, the dummy data inserted into a frame of data to be transmitted To reduce data size by removing
Wireless power transmission method in the energy harvesting, characterized in that.
delete delete delete The method of claim 1,
Wherein the AP, transmitting the data to the receiver in the size of the set data,
A wireless power transmission method in energy harvesting, characterized in that performed in the manner of Simultaneous Wireless Information and Power Transfer (SWIPT).
The method of claim 1,
The receiver,
And a data request module for requesting data from the AP in consideration of a charging rate of a receiver.

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