WO2021096006A1

WO2021096006A1 - System for concurrently transmitting wireless power and data between artificial satellite and satellite payload by using relay resonator

Info

Publication number: WO2021096006A1
Application number: PCT/KR2020/005502
Authority: WO
Inventors: 이강현
Original assignee: 대구대학교 산학협력단
Priority date: 2019-11-15
Filing date: 2020-04-27
Publication date: 2021-05-20
Also published as: KR102379486B1; KR20210059421A

Abstract

According to an embodiment of the present invention, a system for concurrently transmitting wireless power and data between an artificial satellite and a satellite payload by using a relay resonator comprises: a connection part which connects the artificial satellite and the satellite payload to each other; a first coil which is located at one side out of the connection part and transmits power by using a magnetic resonance method; a second coil which is located at the other side out of the connection part and receives power by using a magnetic resonance method; and a relay resonator which is located outside the connection part and increases the transmission efficiency of the power transmitted by the first coil.

Description

[Correction 20.05.2020 according to Rule 26] 　Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator

The following embodiments relate to a system for simultaneously transmitting wireless power and data between a satellite and a payload using a repeater resonator.

Satellites are objects that are artificially made to rotate around a planet. Depending on the altitude of the flying orbit, it is largely divided into stationary satellites and mobile satellites, and according to the purpose of use, it is divided into communication satellites, broadcasting satellites, meteorological satellites, scientific satellites, navigation satellites, earth observation satellites, technology development satellites, and military satellites.

A slip ring is an electrical/mechanical component, also called a rotary joint and a rotary connector, and is a type of rotary connector that can be transmitted without twisting wires when supplying power or signal lines to rotating equipment. Slip rings can be used in electronic systems that require rotation while transmitting power or signals.

In the magnetic resonance method, when two coils resonate at the same frequency, an electromagnetic wave transfers power from a transmitting resonator to a receiving resonator through a near-field magnetic field.

A payload mounted on an artificial satellite generally rotates, and the rotating payload needs a harness for receiving necessary power from the satellite and transmitting information acquired by the payload to the satellite. The spin machine assembly (SMA) is a key component to connect rotation and power or information, and it includes a slip ring assembly (SRA) to prevent twisting of the harness during rotational motion.

However, a slip ring assembly (SRA) to prevent twisting of the harness during rotational motion requires a separate rotor and harness to transmit power and information through mechanical contact to prevent twisting of the harness. There was a problem of not reducing noise generation due to rotational motion.

The present invention was invented to solve the above problems, and its object is to transmit power to the payload without using the harness of the SRA and the SRA, the satellite body, and the payload, and a relay capable of receiving the information acquired by the payload. An object of the present invention is to provide a simultaneous wireless power and data transmission system between a satellite and a payload using a resonator.

Another object of the present invention is to provide a system for simultaneously transmitting wireless power and data between a satellite and a payload using a repeater resonator that can increase power transmission efficiency using a repeater resonator.

Another object of the present invention is to provide a system for simultaneous wireless power and data transmission between a satellite and a payload using a repeater resonator that can use a connection unit connecting the satellite and the payload as magnetic paths.

According to an embodiment of the present invention, in a simultaneous wireless power and data transmission system between an artificial satellite and a payload using a repeater resonator, a connection part connecting the satellite and the payload, located at one side outside the connection part, and a magnetic resonance method A first coil that transmits power by using, a second coil that is located on the other side outside the connection part and receives power using a magnetic resonance method, and a second coil that is located outside the connection part, It includes a repeater resonator to increase transmission efficiency.

In addition, the position of the repeater resonator may be determined based on a coupling coefficient between the first coil and the repeater resonator and a coupling coefficient between the second coil and the repeater resonator.

In addition, the connection part may be made of a material having a magnetic permeability equal to or greater than a predetermined permeability.

In addition, the payload may further include a data transmission device for transmitting the acquired information to the satellite.

In addition, the satellite may further include a data receiving device for receiving information transmitted by the payload.

According to another embodiment of the present invention, in a simultaneous wireless power and data transmission system between an artificial satellite and a payload using a repeater resonator, a connection part connecting the satellite and the payload, located at one side outside the connection part, and a magnetic resonance method A first coil that transmits power by using, a second coil that is located on the other side outside the connection part and receives power using a magnetic resonance method, and a second coil that is located outside the connection part, It includes at least two repeater resonators to increase transmission efficiency.

In addition, the positions of the at least two repeater resonators may be determined based on an input impedance and an output impedance of a system for simultaneously transmitting wireless power and data between the satellite and the payload.

According to an embodiment of the present invention, it is possible to transmit power to the payload without using the harness of the SRA, the SRA, the satellite body and the payload, and receive information obtained by the payload.

In addition, there is an effect of increasing power transmission efficiency by using a relay resonator.

In addition, there is an effect that a connection part connecting the satellite and the payload can be used as a magnetic path.

1 is a diagram illustrating a system for simultaneously transmitting wireless power and data between a satellite and a payload using a repeater resonator according to an embodiment.

2 is a diagram showing a two-coil system and its equivalent circuit.

3 is a diagram showing a system in which a repeater resonator is introduced and an equivalent circuit thereof.

4 is a diagram showing a multi-coil system and its equivalent circuit.

5 is a diagram showing voltage gain curves of a plurality of coil systems.

6 is a diagram illustrating a four-coil self-resonant wireless power transmission system.

7 is a diagram showing a four-coil self-resonant wireless power transmission system and its equivalent circuit.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in the present specification are exemplified only for the purpose of describing the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention are It may be implemented in various forms and is not limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can apply various changes and have various forms, the embodiments will be illustrated in the drawings and described in detail in the present specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various constituent elements, but the constituent elements should not be limited by the terms. The terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of the rights according to the concept of the present invention, the first component may be referred to as the second component, and similarly The second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Other expressions describing the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present specification, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, action, component, part, or combination thereof is present, but one or more other features or numbers It is to be understood that the possibility of addition or presence of, steps, actions, components, parts, or combinations thereof is not preliminarily excluded.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms as defined in a commonly used dictionary should be construed as having a meaning consistent with the meaning of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present specification. Does not.

In the following description, the same identification symbols mean the same configuration, and unnecessary redundant descriptions and descriptions of known technologies will be omitted.

In an embodiment of the present invention,'communication','communication network', and'network' may be used with the same meaning. The three terms refer to wired/wireless local and wide area data transmission/reception networks capable of transmitting and receiving files between a user terminal, a terminal of other users, and a download server.

Hereinafter, the present invention will be described in detail by describing a preferred embodiment of the present invention with reference to the accompanying drawings.

Referring to FIG. 1, a system 100 for simultaneously transmitting wireless power and data between a satellite and a payload using a repeater resonator includes a satellite 110, a payload 120, and a connection unit 130.

The satellite 110 may provide a structure capable of being coupled with the connection unit 130.

The satellite 110 may supply power required by the payload 120 using magnetic resonance.

The satellite 110 may receive data transmitted by the payload 120 using magnetic resonance. In this case, the data may include data acquired by the payload 120 (eg, observation data) and data that can confirm whether the payload 120 is operating normally.

The satellite 110 may include a data receiving device (not shown) for receiving data transmitted by the payload 120. In this case, the data receiving device (not shown) may recognize a difference in the received voltage as data (eg, 0 or 1).

The satellite 110 may transmit a signal for controlling the payload 120 to the payload 120 using magnetic resonance.

The satellite 110 is located on one side outside the connection unit 130 and is connected to a first coil that transmits power using a magnetic resonance method to supply power to the first coil.

The satellite 110 is located on one side outside the connection unit 130, is connected to a first coil that transmits power using a magnetic resonance method, and may receive data transmitted by a second coil connected to the payload 120. .

The mounting body 120 may provide a structure capable of being coupled with the connection unit 130.

The payload 120 may receive power transmitted by the satellite 110 and perform a preset operation (eg, ground observation) using the received power.

The payload 120 may generate data for transmission to the satellite 110. In this case, the data may include data acquired by the payload 120 (eg, ground observation data) and data that can confirm whether or not the payload 120 is operating normally.

The payload 120 may include a data transmission device (not shown) for transmitting the generated data to the satellite 110. In this case, the data transmission device (not shown) may generate a difference in voltage received by the satellite 110 by using a circuit including at least one switch and at least one capacitor.

The operation of the payload 120 may be controlled by a signal for controlling the payload 120 transmitted by the satellite 110.

The payload 120 is located on the other side of the connection unit 130 and is connected to a second coil that receives power using a magnetic resonance method to obtain power transmitted by the satellite 110.

The payload 120 is located on the other side of the connection unit 130 and is connected to a second coil that receives power using a magnetic resonance method to transmit data to the first coil connected to the satellite 110.

The connection unit 130 may provide a structure capable of being combined with the satellite 110 and the mounting body 120.

A first coil may be located on one side of the outside of the connection part 130, and a second coil may be located on the other side of the outside of the connection part 130.

A relay resonator may be located outside the connection part 130 between the first coil and the second coil located on the one side of the outside of the connection part 130 and the other part. In this case, the position of the repeater resonator may be determined based on a coupling coefficient between the first coil and the repeater resonator and a coupling coefficient between the second coil and the repeater resonator.

A plurality of repeater resonators may be located outside the connection part 130 between the first coil and the second coil located at the one side of the outside of the connection part 130 and the other part. In this case, each of the plurality of repeater resonators may be positioned at positions where input impedance and output impedance are the same.

The connection part 130 may be made of a material having a magnetic permeability equal to or greater than a predetermined permeability. In this case, the material having a permeability greater than or equal to the preset permeability may be ferrite, but the material having a permeability greater than or equal to the preset permeability is not limited thereto.

The connection unit 130 may have a cylindrical shape, but may be implemented in any shape that does not interfere with the rotation of the mounting body.

The connection part 130 may be used as a magnetic path.

The term'device' used herein denotes a logical structural unit, and it is obvious to those skilled in the art that the present invention is not necessarily a physically classified component.

2 is a diagram showing a two-coil system and its equivalent circuit.

Referring to FIG. 2, the resonant frequency of a two-coil system can be obtained using the following [Equation 1].

In addition, assuming that the self-inductance of the primary side transmitter, the resonance frequency of the capacitor, the secondary side self-inductance, and the resonance frequency of the capacitor are the same as the resonance frequency obtained in [Equation 1], the efficiency of a two-coil system Can be derived using the following [Equation 2].

Referring to [Equation 2], it can be seen that the coupling coefficient k directly affects the efficiency of the two-coil system.

The biggest cause of the reduction in the efficiency of the 2 coil system is the increase in conduction loss due to the primary reflux current due to the lowered coupling factor. Therefore, for high efficiency, loss reduction at the transmitting end is required.

Referring to FIG. 3, FIG. 3(a) shows a first coil, a repeater resonator, and a second coil, and FIG. 3(b) shows an equivalent circuit of a first coil, a repeater resonator, and a second coil.

Referring to Figure 3 (a), suppose that the coupling coefficient between the first coil 301 and the repeater resonator 303 is k1, and the coupling coefficient between the repeater resonator 303 and the second coil 302 is k2, The efficiency of the system according to the position of the repeater resonator can be derived using the following [Equation 3].

In addition, the current of the first coil and the relay resonator can be induced using the following [Equation 4].

Referring to [Equation 3] and [Equation 4], the coupling coefficient k2 between the repeater resonator 303 and the second coil is slightly reduced, and the coupling between the first coil 301 and the repeater resonator 303 It can be seen that increasing the coefficient k1 reduces the reflux current to reduce the conduction loss. Therefore, positioning the repeater resonator 303 close to the first coil 301 may be one of the ways to increase the efficiency of the system.

4 is a diagram showing a multi-coil system and its equivalent circuit.

Referring to Figure 4, Figure 4 (a) is a three-coil (coil) system, Figure 4 (b) is a four-coil (coil) system.

4(a) shows a state in which the repeater resonator 401 is connected to the three-coil system 400 and an equivalent circuit 410 thereof.

4(b) shows a state in which the repeater resonator 421 is connected to a four-coil system 420 and an equivalent circuit 430 thereof.

It can be seen that the multiple (three-coil or four-coil) coil system creates an additional LC resonant impedance in the two-coil system. Therefore, the voltage gain curve must be obtained through impedance analysis, and the operating frequency must be determined accordingly.

3 The voltage gain of the coil system can be calculated using the following [Equation 5].

In addition, the voltage gain of a four-coil system can be obtained using the following [Equation 6].

In order to determine the operating frequency, a voltage gain curve of FIG. 5 to be described later was derived.

5 is a diagram showing voltage gain curves of a plurality of coil systems.

Referring to FIG. 5, FIG. 5(a) is a voltage gain curve of a two-coil system, and FIG. 5(b) is a voltage gain curve of a three-coil system.

Referring to FIG. 5 (a), when a two-coil system is operated at fw (self-inductance resonance), the voltage gain may fall below 1 in the heavy load region, and the voltage gain greatly changes, thus complicating the system design. Can be set.

5(a) and 5(b), if a two-coil system or a three-coil system is operated at fL_2, fH_2, fL_3, fH_3 (leakage inductance resonance), voltage gain is obtained depending on the load. It does not change, so design and operation can be simplified. However, if the load is sufficient, the voltage gain is high and the coupling factor is high, so the operation at the point fw can be considered.

6 is a diagram illustrating a four-coil magnetic resonance wireless power transmission system, and FIG. 7 is a diagram illustrating a four-coil magnetic resonance wireless power transmission system and an equivalent circuit thereof.

Referring to FIG. 6, the four-coil self-resonant method has an advantage that the volume of the system is large because more windings are used, but the coupling coefficient is high. At this time, the weak coupling 601 is not considered for convenience of analysis.

Referring to FIG. 7 (a), impedance analysis may be performed through an equivalent circuit in order to obtain a coupling coefficient of a four-coil self-resonant wireless power transmission system.

If the equivalent circuit of FIG. 7 (a) is briefly summarized, an equivalent model as shown in FIG. 7 (b) can be obtained.

Referring to FIG. 7(b), if the impedances projected onto the primary coil are set to "1", the following [Equation 7] is established.

In addition, the impedance viewed from immediately behind Lp in FIG. 7(b) can be obtained using the following [Equation 8].

Therefore, the impedance viewed from the power of the transmitting end can be obtained using the following [Equation 9].

Referring to [Equation 9], if the input impedance and the output impedance are the same, the coupling coefficient is 100%, and the loss can be reduced, thereby increasing the efficiency. Accordingly, in order to increase power transmission efficiency by using at least two or more repeater resonators, the at least two repeater resonators must be arranged so that the input impedance and the output impedance of the self-resonant wireless power transmission system are the same.

In the above, even if all the constituent elements constituting the embodiments of the present invention have been described as being combined into one or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the constituent elements may be selectively combined and operated with at least one.

In addition, although all of the components may be implemented as one independent hardware, a program module that performs some or all functions combined in one or more hardware by selectively combining some or all of the components. It may be implemented as a computer program having Codes and code segments constituting the computer program may be easily inferred by those skilled in the art of the present invention.

Such a computer program is stored in a computer-readable storage medium, and is read and executed by a computer, thereby implementing an embodiment of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, and the like.

In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be embedded unless otherwise stated, excluding other components. It should not be construed as being able to further include other components.

All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning in the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The methods disclosed in the present invention comprise one or more actions or steps for achieving the above-described method. Method actions and/or steps may be interchanged with each other without departing from the scope of the claims. In other words, unless a specific order for the actions or steps is specified, the order and/or use of specific actions and/or steps may be modified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” in a list of items refers to any combination of these items, including single members. As an example, “at least one of a, b, or c:” means a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same element (eg, aa , aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other ordering of a, b, and c).

As used herein, the term "determining" encompasses a wide variety of actions. For example, “determining” may include computing, computing, processing, deriving, examining, looking up (eg, looking up in a table, database, or other data structure), identifying, and the like. . Further, “determining” may include receiving (eg, receiving information), accessing (accessing data in a memory), and the like. Also, “determining” may include resolving, choosing, choosing, establishing, and the like.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims

In a simultaneous wireless power and data transmission system between a satellite and a payload using a repeater resonator,

A connection part connecting the satellite and the payload;

A first coil located on one side of the outside of the connector and transmitting power using a magnetic resonance method;

A second coil located on the other side of the connection part and receiving power using a magnetic resonance method; And

A repeater resonator located outside the connection part and increasing the transmission efficiency of the power transmitted by the first coil

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator comprising a.
The method of claim 1,

The position of the relay resonator is,

A system for simultaneously transmitting wireless power and data between a satellite and a payload using a repeater resonator that is determined based on a coupling coefficient between the first coil and the repeater resonator and a coupling coefficient between the second coil and the repeater resonator.
The method of claim 1,

The connection part,

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator made of a material having a magnetic permeability equal to or higher than a preset permeability
The method of claim 1,

The payload,

Data transmission device for transmitting the acquired information to the satellite

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator further comprising a.
The method of claim 1,

The satellite is

Data receiving device for receiving information transmitted by the payload

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator further comprising a.
In a simultaneous wireless power and data transmission system between a satellite and a payload using a repeater resonator,

A connection part connecting the satellite and the payload;

A first coil located on one side outside the connection part and transmitting power using a magnetic resonance method;

A second coil located on the other side of the connection part and receiving power using a magnetic resonance method; And

At least two repeater resonators located outside the connection part and increasing the transmission efficiency of the power transmitted by the first coil

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator comprising a.
The method of claim 6,

The positions of the at least two relay resonators are,

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator determined based on the input impedance and output impedance of the simultaneous wireless power and data transmission system between the satellite and the payload.
The method of claim 6,

The connection part,

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator made of a material having a magnetic permeability equal to or higher than a preset permeability
The method of claim 6,

The payload,

Data transmission device for transmitting the acquired information to the satellite

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator further comprising a.
The method of claim 6,

The satellite is

Data receiving device for receiving information transmitted by the payload

Simultaneous wireless power and data transmission system between the satellite and the payload using a repeater resonator further comprising a.