WO2011055905A2

WO2011055905A2 - System and method for space-adaptive wireless power transmission using evanescent wave resonance

Info

Publication number: WO2011055905A2
Application number: PCT/KR2010/006447
Authority: WO
Inventors: 박영진; 이순우; 강지명; 김진욱; 김관호
Original assignee: 한국전기연구원
Priority date: 2009-11-04
Filing date: 2010-09-17
Publication date: 2011-05-12
Also published as: WO2011055905A3

Abstract

According to one aspect of the present invention, a magnetic resonance wireless power transmission method comprises the following steps: enabling a source coil to transmit electrical energy to a power-transmitting resonant coil via electromagnetic induction; enabling the power-transmitting resonant coil to transmit electrical energy to a power-receiving resonant coil which has a resonant frequency identical to that of the power-transmitting resonant coil in accordance with a magnetic resonant coupling; enabling the power-receiving resonant coil to transmit electrical energy to a device coil of electronic equipment via electromagnetic induction, wherein the power-transmitting resonant coil and the power-receiving resonant coil are arranged vertically to each other or inclined at a predetermined angle.

Description

Space Adaptive Wireless Power Transmission System and Method Using Attenuation Wave Resonance

The present invention relates to a wireless power transmission system and method using the magnetic resonance (or resonance) of the attenuation wave generated around the wireless power transmission coil, in particular, the power receiver resonant coil to have the same resonance frequency as the power transmitter resonant coil The magnetic field coupling between the transmitting resonant coil and the receiving resonant coil should be configured and positioned on a plane having a vertical or arbitrary angle so that the power receiver has a vertical or arbitrary angle even when the power transmission unit and the central axis are not in a straight line. In this case, a space-adaptive self-resonant wireless power transmission system capable of reliably receiving power by bringing electronic devices, such as a mobile phone with a built-in power receiver device coil, near the power transmission unit so that power transmission can be efficiently performed; It is about a method.

Recently, many researches have been conducted on wireless power transmission using electromagnetic induction in a low frequency band. However, there is a disadvantage in that power transmission can be performed only within a few cm. In addition, the electromagnetic induction method has a lot of difficulties in the use of the wireless power transmission system because the efficiency is sharply reduced when the arrangement of the transmitting and receiving coils do not match.

Korean Patent Registration No. 10-0809461 discloses a configuration for increasing a power reception distance by using an electromagnetic amplification repeater using LC resonance. In this case, a LC resonance is performed by using a variable capacitor in a solenoid type coil wound around a magnetic body to increase magnetic flux. This method uses a separate LC resonant coil in the transmitter and receiver, unlike the conventional electromagnetic induction. As mentioned in this patent, transmission distance and efficiency can be increased. However, the invention disclosed herein uses a variable capacitor to tune the resonant frequencies of the transmit and receive resonant coils. However, it is difficult to precisely adjust the value of the variable capacitor corresponding to the resonance frequency. In addition, what has been dealt with in this prior patent discloses wireless power transmission using only a parallel arrangement between resonant coils, which makes it difficult to apply to various real life.

In US Patent Publication No. US2009-0224856A1, a wireless power transfer method using a magnetic resonance method is disclosed. In the present invention, the general contents of the magnetic resonance method are disclosed, and configurations related to Q-factor, resonant frequency, and the like are disclosed. Here, a method of improving power transmission efficiency and transmission distance using a magnetic resonance type structure having the same resonance frequency and having a very strong magnetic field coupling is proposed.

In US Patent Publication No. US2009-0072629A1, a resonant coil is constructed by using a variable capacitor in a manner similar to that of a Korean patent (Registration No.:10-080941).

US Patent Publication No. US2009-0153273A1 proposes a method for improving transmission distance and efficiency by using a separate resonance coil between transmission and reception so that the arrangement of transmission and reception is identical. However, this method is for the case of a one-line array in consideration of the coupling constant between coils, and all resonant coils exist on the same plane. When all the resonant coils exist in the same plane, the coupling constant between the coils is lowered and the transmission efficiency is lowered.

In the prior art of the four prior patents, the coil arrangement is not described, and all attempts to approach the power transmission efficiency and distance improvement methods on the assumption that all of the parallel arrangement. However, when only parallel arrangement is used, there are many parts that are difficult to apply due to spatial constraints in real life, and thus a solution for this is needed. In addition, there is a need for a method capable of transmitting power in various arrangements between the vertical arrangement or the transmission / reception coils for free space arrangement of the power receiver, but there is no solution.

Accordingly, an object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a quantitative and quantitative characteristic for magnetic resonance coils in which magnetic resonance of attenuation waves occurring around a wireless power transmission coil occurs. By analyzing the qualitative characteristics and presenting the characteristics of the directionality of the magnetic resonance method, based on the characteristic that the directional influence of the coils with the magnetic resonance is small, the directional problem in the magnetic induction method is solved, and even in various spatial arrangements between the transmission and reception The present invention provides a space adaptive self-resonant wireless power transmission system and method capable of power transmission.

In addition, based on the characteristic that the directional influence of the coils with the magnetic resonance is small, it is suitable for various horizontal and vertical spaces through various arrangements between the resonant coils in order to extend the energy transfer distance through various position combinations of the coils with the magnetic resonance. The present invention provides a space adaptive self-resonant wireless power transmission system and method for providing a power transmission method.

In addition, the space-adaptive type adopts a helical or spiral coil for overcoming the spatial limitations of the parallel arrangement through the vertical or arbitrary angle arrangement of the resonant coils, and for resonant transmission and reception of the resonant coils in an open form. A self-resonant wireless power transmission system and method are provided.

First, to summarize the features of the present invention, the wireless power transmission method using the magnetic resonance of the attenuation wave generated around the coil according to an aspect of the present invention for achieving the above object, the transmission unit in the electromagnetic coil induction method Transferring power to the resonant coil; Transferring power from the transmitter resonant coil to a receiver resonant coil having the same resonance frequency as the transmitter resonant coil according to magnetic resonance coupling; And transmitting electric power from the power receiver resonant coil to the device coil of the electronic device in an electromagnetic induction manner, wherein the power transmitter resonant coil and the power receiver resonant coil are arranged perpendicular to each other or inclined at a predetermined angle. It features.

In addition, the self-resonant wireless power transmission method according to another aspect of the present invention, the step of transferring the power from the source coil to the transmission unit resonant coil in an electromagnetic induction method; Transferring power from the transmitter resonant coil to a relay resonant coil having the same resonance frequency as the transmitter resonant coil according to magnetic resonance coupling; Transferring power from the relay resonant coil to a power receiver resonant coil having the same resonance frequency as the relay resonant coil according to a magnetic resonance mechanism; And transferring electric power from the power receiver resonant coil to the device coil of the electronic device in an electromagnetic induction manner, wherein the relay resonant coil is inclined perpendicularly or at an angle to the power transmitter resonant coil and the power receiver resonant coil. Characterized in that it is arranged.

In addition, the self-resonant wireless power transmission system according to another aspect of the present invention, a source coil for receiving power from the source; A transmission unit resonant coil receiving electric power from the source coil in an electromagnetic induction manner; And a power receiver resonant coil that receives power from the power transmitter resonant coil at the same resonance frequency as the power transmitter resonant coil according to self resonance coupling, wherein the power transmitter resonant coil and the power receiver resonant coil It is arranged vertically or inclined at an angle, characterized in that the power receiver resonant coil transfers power to the device coil of the electronic device in an electromagnetic induction manner.

The self-resonant wireless power transmission system according to another aspect of the present invention includes a source coil receiving power from a source; A transmission unit resonant coil receiving electric power from the source coil in an electromagnetic induction manner; A relay resonant coil receiving electric power from the transmitter resonant coil at the same resonance frequency as the transmitter resonant coil according to a magnetic resonance mechanism; And a power receiver resonant coil receiving power from the relay resonant coil at the same resonance frequency as the relay resonant coil according to magnetic resonance coupling, wherein the relay resonant coil includes the power transmitter resonant coil and the power receiver resonator. It is arranged perpendicular to the coil or inclined at an angle, characterized in that the power receiver resonant coil transfers power to the device coil of the electronic device in an electromagnetic induction manner.

The apparatus may further include a circuit for impedance matching between the source and the source coil, or between the device coil and a rectifier circuit or a load.

A device such as a lumped inductor or a capacitor may be connected to both ends of the magnetic resonance coil and the relay resonant coil, or to an intermediate portion of the relay resonance coil. At this time, it is recommended that parasitic resistances of the inductor and the capacitor be less than a few ohms. Such devices include high Q lumped-inductors and capacitors having high Q values. In addition, a structure capable of providing precise capacitor values such as coaxial lines may be used.

By using the proposed capacitor as described above, a relatively low coil inductance value is required for the same resonance frequency (f = 1 / (LC) 1/2), thereby reducing the length and volume of the coil, which in turn is a total resonance. The volume of the structure can be reduced. However, the use of a capacitor may be disadvantageous in efficiency, but using an appropriate capacitor facilitates tuning of the transmit and receive resonant frequency, which is a major problem in the self resonant structure.

The capacitance value of the capacitor used herein preferably has a value of 100 pF or more in combination with the capacitor made in the coil in order to prevent the capacitor from changing due to the contact between the human body and the foreign material and the resonance frequency. In addition, in order to maintain a high quality factor (Q-factor), it is desirable that the sum of the capacitors made in the coil and the added capacitors has a value of 10 nF or less.

In addition, the additionally attached capacitor can be used for fine tuning of the resonance frequency. In other words, accurate resonant frequency tuning of the transmit and receive resonant coils can directly affect power transfer. Therefore, in order to maximize the efficiency of the system, the resonant frequency should be adjusted to be the same, but in actual production, even if they have the same structure, the resonant frequency varies according to the parasitic effect. The resonant frequency duplexing process for these devices is essential.

In particular, in order to accurately match the resonant frequency between the transmission and reception resonant coil, a capacitor may be fixed and an inductor having a low loss or high Q value may be used.

The electronic device may operate an internal circuit using the power induced by the device coil, or may rectify the power induced by the device coil to charge the battery.

The power transmitter resonant coil is installed inside an insulator wall, and the power receiver resonant coil is installed inside a desk or table or the space around the insulator wall, inside another insulator wall, inside a pad, or inside a container. All of the electronics around the resonant coil can be powered.

According to the space-adaptive self-resonant wireless power transmission system and method according to the present invention, it is possible to overcome the limitations of the practical application of power transmission through the existing parallel arrangement (when the center axis of the transmitting and receiving coils coincide). In the case of the existing parallel arrangement, when the distance between transmission and reception increases, there is an obstacle between transmission and reception, or in parallel with transmission and reception (when the coil axes coincide) due to space constraints between transmission and reception. Since the relay coil often cannot be placed, the application is limited in situations where it is difficult to receive power in a parallel arrangement.

However, if the vertical or arbitrary angle arrangement as in the present invention is used, the entire disadvantage of the transmission part may be eliminated since the entire transmission part is embedded in the wall or invisible. That is, the arrangement of the resonant coil can be configured to suit the surrounding environment, thereby improving the power transmission distance and improving the power transmission efficiency. The magnetic resonance method uses characteristics that are not significantly affected by obstacles such as walls, water, etc., and the power transmission unit resonant coil can be placed at any desired location because the space where power is transmitted can be determined as the position of the power receiver resonance coil. Can be installed and used. The power receiver resonant coil is a helical or spiral coil that is located alone, so that the wires do not need to be additionally connected, and thus may be embedded in a desk or the floor.

1 is an equivalent circuit of a space adaptive self-resonant wireless power transmission system according to an embodiment of the present invention.

2 is a view for explaining a power transmission method in a space adaptive self-resonant wireless power transmission system according to an embodiment of the present invention.

3 is a view for explaining a space-adaptive magnetic resonance wireless power transmission system according to another embodiment of the present invention.

FIG. 4 is a diagram for describing a magnetic field pattern in the vertical arrangement of the transmission and reception resonant coil as shown in FIG. 2.

FIG. 5 is an S parameter result seen through the simulation of FIG. 4.

FIG. 6 is a diagram for describing a magnetic field pattern when there is a relay resonant coil arranged vertically with respect to the transmission and reception resonant coil as shown in FIG. 3.

FIG. 7 shows changes over time of attenuation wave modes in each resonant coil with respect to the case of using the relay resonant coil.

8A illustrates a coordinate system in which a power transmission unit resonant coil and a power reception unit resonant coil are disposed vertically.

8B is a view for explaining a change in efficiency as the power receiving unit resonant coil is changed to the z-axis.

FIG. 9 is a variation of FIG. 2, and illustrates a structure in which the transmission and reception resonant coils are not present on the same plane so that their central axes are parallel but the central axes do not coincide.

FIG. 10 is a modification of FIG. 3, in which a relay resonant coil may not be coplanar with the transmitter resonant coil and the receiver resonant coil, and may be arranged such that the central axes thereof are parallel but the central axes do not coincide. Indicates.

11 is a helical coil fabricated to have a resonant frequency at 900 kHz.

FIG. 12 is a view showing a region (3dB boundary line) where power transmission efficiency of 50% is seen when the resonant coil shown in FIG. 11 is used in the transmitter and receiver.

13 to 17 are examples of applications in which the transmission and reception

resonant coils

114 and 121 are arranged in a vertical or arbitrary angle rather than in a parallel arrangement to increase utilization in real life.

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

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

1 is an equivalent circuit of a space-adaptive magnetic resonance wireless power transmission system 100 according to an embodiment of the present invention.

Referring to FIG. 1, a space-adaptive magnetic resonance wireless power transmission system 100 according to an embodiment of the present invention includes a power transmitter 110 and a power receiver 120, and the power transmitter 110 is a source. A reference numeral 111, a matching circuit 112, a source coil 113, and a transmission resonant coil 114 in a helical or spiral form, wherein the power receiver 120 is in a helical or spiral form. The power receiver includes a resonant coil 121, a device coil 122, a rectifier circuit 123, and a load 124. The transmitter resonant coil 114 and the receiver resonant coil 121 may be formed of a Litz wire, or the like, and may have various shapes in addition to the helical or spiral shape, and may be made of a superconductor material to reduce electrical resistance. . In order to reduce the sizes of the power transmitter resonant coil 114 and the power receiver resonant coil 121, a predetermined wire may be wound around a predetermined magnetic material. The power transmitter resonant coil 114 and the power receiver resonant coil 121 may have a constant capacitance component, and if necessary, a device such as a lumped capacitor or inductor having a predetermined capacitor or inductance having a high Q value may be used. It can be used in addition to the coil. For example, a capacitor or an inductor connected to the transmitter resonant coil 114 or the receiver resonant coil 121 may have both electrodes connected between both ends of the coil, but is not limited thereto. Connecting only one of the electrodes to both ends of the resonant coil 114/121 (which may be both ends, or may be either end). At this time, the total capacitor (Ct) of each resonant coil is composed of a capacitor (Co) by the coil itself and a capacitor (Ca) additionally attached for resonant frequency tuning and external influence reduction (only Ct is shown in the figure). Here, in order to prevent the capacitor from changing due to the influence of the human body and the contact of the material and the resonance frequency, it is preferable to have a value of 100 pF or more by adding the capacitances of Co and Ca, and to have a high quality factor (Q-factor). In order to maintain, it is preferable that the capacitances of Co and Ca add up to 10 nF or less. However, the present invention is not limited thereto, and the capacitance sum of Co and Ca may be 100pF or less or 10nF or more, depending on the system environment.

The energy transfer mechanism is as follows. Power supplied from the source 111 is applied to the source coil 113 via the source 111 and the matching circuit 112. According to the time-varying current applied through the matching circuit 112, the source coil 113 transfers power to the power transmission unit resonant coil 114 in an electromagnetic induction manner. The transmitter resonant coil 114 stores power through self-resonance, and when there is a receiver resonant coil 121 having the same resonant frequency, energy is transmitted through the attenuation wave magnetic field resonance coupling between the transmission and reception resonant coils. The transfer channel is formed to transfer power to the power receiver resonance coil 121. The power transmitter resonant coil 114 and the power receiver resonant coil 121 may transmit power in a low frequency band of about 100 kHz to several MHz.

Although the matching circuit 112 is used between the source 111 and the source coil 113 for impedance matching between the source coil 113 and the transmitter resonant coil 114 in the power transmitter 110, the matching circuit 112 is used. Resonance by adjusting the number and size of windings of the transmission unit resonant coil 114 and the power receiving unit resonant coil 121 or the source coil 113 in consideration of the number and size (diameter) of the winding of the source coil 113 even without Matching can also be made automatically at the frequency. Similarly, although not shown in the figure, impedance matching is required between both ends of the device coil 122, for example, between the device coil 122 and the rectifier circuit 123, or between the device coil 122 and the load 124. A circuit may be placed, followed by the rectifier circuit 123 and the load 124 after the impedance matching circuit. In this case, the winding of the device coil 122 may be controlled to automatically match at the resonance frequency by adjusting the number and size of the windings.

2 is a view for explaining a power transmission method in the space adaptive self-resonant wireless power transmission system 100 according to an embodiment of the present invention.

In FIG. 2, energy transmission is performed through magnetic resonance between the transmission and reception

resonant coils

114 and 121 arranged to have a vertical or arbitrary angle, and for example, the transmission unit resonant coil 114 according to an electromagnetic induction method. ) Stores energy, and when there is a power receiver resonant coil 121 having the same resonant frequency, an energy transfer channel is formed through attenuation wave magnetic field resonance coupling between the transmission and reception resonant coils to transfer power to the power receiver resonant coil 121. The power delivered to the power receiver resonant coil 121 may be directed to an adjacent device coil 122, and the power rectified by the rectifier circuit 123 may be used at the load 124 of the device. The device coil 122, the rectifier circuit 123, and the load 124 may be embedded in a device, i.e., an electrical device, and the load 124 may be used to charge power delivered through the rectifier circuit 123. It may be a battery such as a car battery.

As can be seen in Figures 1 and 2, the power receiving method proposed in the present invention is disposed inclined at a predetermined angle to have a vertical or arbitrary angle, rather than a general parallel arrangement between the transmission and reception resonant coils (114, 121) It refers to the power receiving method in the state. In order to efficiently transmit power even in a vertical or arbitrary angle, a magnetic resonance method using the transmission and reception resonance coils 114 and 121 having the same resonance frequency is used.

Referring to FIG. 3, in addition to the power transmitter 110 and the power receiver 120 described with reference to FIG. 1, the space adaptive self-resonant wireless power transmission system according to another embodiment of the present invention includes a power transmitter 110 and a power receiver. The transmission relay 130 may further include a helical or spiral type relay resonant coil 131 and a relay device coil 132 (or a device coil may be omitted if necessary). The relay resonant coil 131 may also be made of a Litz wire, or the like, and may have various shapes in addition to the helical or spiral form, and may be made of a superconductor material to reduce electrical resistance. In order to reduce the size of the relay resonant coil 131, a predetermined wire may be wound around a predetermined magnetic material. In addition, although not shown in the drawing, the relay resonant coil 131 may also have a constant capacitance component, and a device such as a lumped inductor having a predetermined capacitor or inductance having a high Q value may be connected to the coil if necessary. Can be used. For example, a capacitor or an inductor connected to the relay resonant coil 131 may have both electrodes connected between both ends of the relay resonant coil 131, but is not limited thereto. Both ends of the relay resonant coil 131 (or both ends may be included). At this time, the entire capacitor (Ct) of the relay resonant coil 131 is composed of a capacitor (Co) by the coil itself and a capacitor (Ca) additionally attached for resonant frequency tuning and external influence reduction. Here, in order to prevent the capacitor from changing due to the influence of the human body and the contact of the material and the resonance frequency, it is preferable to have a value of 100 pF or more by adding the capacitances of Co and Ca, and to have a high quality factor (Q-factor). In order to maintain, it is preferable that the capacitances of Co and Ca add up to 10 nF or less. However, the present invention is not limited thereto, and the capacitance sum of Co and Ca may be 100pF or less or 10nF or more, depending on the system environment.

In FIG. 3, the relay resonant coil 131 of the power transmission relay 130 is vertically arranged with the power transmitter resonant coil 114 and the power receiver resonant coil 121. At this time, the power transmission unit resonant coil 114 and the power receiving unit resonant coil 121 may be parallel. However, since the relay resonant coil 131 may be arranged to be inclined at a predetermined angle with the power transmitter resonant coil 114 and the power receiver resonant coil 121, the power transmitter resonant coil 114 and the power receiver resonant coil 121 may be inclined. This is not always arranged in parallel. The relay resonant coil 131 relays power from the transmitter resonant coil 114 to increase the power transmission distance, and at the same time, rectifies the electric power induced by the device coil 132 to be used for the load. 130 may itself serve as a power receiver. As described above, the strong magnetic field coupling occurs by the magnetic resonance between the power transmission unit resonant coil 114 and the relay resonant coil 131, and the power stored in the relay resonant coil 131 is again received. The resonance coil 121 may be transmitted through a strong magnetic field coupling by magnetic resonance. In addition, when the device coils 132/122 are positioned near the power receiving unit resonant coil 121 or the relay resonant coil 131, power may be transferred to the device coils 132/122 according to an electromagnetic induction method.

In the contour distribution of the magnetic field strength as shown in FIG. 4, the narrower the interval between the contour lines, the greater the magnetic field strength. As can be seen in FIG. 4, it can be seen that a very large magnetic field is formed only around the power transmitter resonant coil 114 and the power receiver resonant coil 121 to generate magnetic resonance between the two coils. The helical transmission and reception

resonant coils

114 and 121 used for the simulation are the same, the wire diameter is 4mm, the number of turns 5 times, the coil diameter is 20cm, the pitch is 0.54cm. Theoretically, the resonance frequency is 28MHz, but in practice it is at 22MHz. Although the theoretical value and resonance frequency are different, it can be seen that resonance occurs between coils having the same resonance frequency. As can be seen in Figure 4 it can be seen that the magnetic field is not radiated between the same resonant coil at the same resonant frequency, the tail of the attenuation waves present around the coil is connected to each other. It can be seen that such mutual coupling has little effect on the arrangement between the resonant coils.

5 is a scattering parameter result seen through the simulation of FIG. 4. The source coil 113 gave a port with a 50 Ω impedance for signal excitation, and the device coil 122 also gave a port with a 50 Ω impedance. As shown in FIG. 5, the reflection coefficient of the power transmission unit 110 is -7.52 dB and the reflection coefficient of the power reception unit 120 is -9.4 dB at 22 MHz, which is a resonance frequency of the transmission and reception resonance coils 114 and 121. Able to know. The spacing between the source coil 113 and the resonant coil 114 (the device coil and the resonant coil in the power receiver) and the shape of the source coil (device coil) of the power transmitter 110 without the addition of a separate impedance matching circuit. By adjusting the number of windings and the size, the impedance matching can be automatically performed at the resonant frequencies of the transmission and reception

resonant coils

114 and 121. As a result of the simulation, when the distance between the transmission and reception

resonant coils

114 and 121 is compensated for by the matching of the transmission and reception unit, the power transfer efficiency between the transmission and reception

resonant coils

114 and 121 due to magnetic resonance is about 60%.

FIG. 6 is a diagram for describing a magnetic field pattern when there is a relay resonant coil 131 arranged vertically with respect to the transmission and reception

resonant coils

114 and 121 as shown in FIG. 3. In FIG. 6, a is a magnetic field pattern when viewed from the side, and b is a magnetic field pattern when viewed from above. FIG. 6 illustrates a result of simulating a magnetic resonance phenomenon using a single loop connected to a plate capacitor between both ends as a relay resonant coil 131. The use as relay resonant coil 131 here is given in reference US2007 / 0222542 A1 "Wireless non-radiative energy transfer". The wire thickness is 2cm, the loop diameter is 60cm, the plate capacitor's plate spacing is 4mm, the plate width is 138cm2 and the dielectric constant is 10. The resonant frequency of the loop at this time is 7.8 MHz. Although the distance between the transmission and reception

resonant coils

114 and 121 is 1m, it can be seen that power can be well transmitted to the power receiving unit 120 due to the vertically arranged relay resonant coil 131.

More specifically, when explaining the basic principle, the coupling phenomenon between the resonant coils having the same resonant frequency is that the attenuation waves generated around the transmission unit resonant coil 114 is coupled with the adjacent receiving unit resonant coil 121. 4 and 6, the coupling occurs at the shortest distance between the transmitter resonant coil 114 and the receiver resonant coil 121. The size of this coupling may be small, but if the attenuation of the attenuation wave occurs slowly, a large amount of energy is transferred to the power receiver for a small amount of time even with a small coupling. This result can be seen in FIG. That is, as shown in FIG. 7, the change in the attenuation wave modes of the resonant coils 114/121/131 in the case of using the relay resonant coil 131 of FIG. 6 is shown with time. The attenuation wave mode in the transmission unit resonant coil 114 in the figure continues oscillating with the resonant frequency, and the size gradually decreases. The relay resonant coil 131 receives energy little by little, and the energy received from the relay resonant coil 131 is transmitted to the power receiver resonant coil 121 again. Of course, the transmission unit resonant coil 114 may also be directly transmitted to the receiving unit resonant coil 121, but this is very small compared to the amount passed through the relay resonant coil 131. However, in the conventional electromagnetic induction, it is difficult to transfer power in a vertical direction where the coupling is small because a large coupling is always required instead of such a coupling phenomenon.

Unlike the parallel arrangement (array in which the central axes of the coils coincide), the proposed invention arranges the resonant coils to have a vertical or arbitrary angle, and it may be difficult to transmit power in a portion where the coupling is rapidly small. . 8 shows the transfer characteristics for the vertical arrangement between such resonant coils. As shown in Fig. 8A, the power transmission unit resonant coil 114 and the power receiving unit resonant coil 121 are vertically arranged and simulated within a quarter quadrant. The resonant coils used here are those disclosed in reference US2007 / 0222542 A1 "Wireless non-radiative energy transfer". The wire thickness is 2 cm, the loop diameter is 60 cm, the plate capacitor's plate spacing is 4 mm, the plate width is 138 cm2, and the dielectric constant is 10. The resonant frequency of the loop at this time is 7.8 MHz. As shown in FIG. 8B, it can be seen that the efficiency changes as the position of the power receiving unit resonant coil 121 is changed to the z-axis. However, below a certain distance it can be confirmed that the transmission efficiency is more than 80%. However, for the case near x = 0, the power transfer efficiency may be low because the coupling coefficient is theoretically very small.

9 is a variation of FIG. 2, wherein the power transmission and

resonant coils

114 and 121 may be disposed to be inclined at an angle to have a vertical or arbitrary angle. In FIG. 9, the coils do not exist on the same plane. Thus indicating that the central axes are parallel but may be arranged such that they do not coincide.

FIG. 10 is a variation of FIG. 3, wherein the relay resonant coil 131 may be disposed to be inclined at a predetermined angle to have a vertical or arbitrary angle with the power transmitter resonant coil 114 and the power receiver resonant coil 121. In FIG. 10, the relay resonant coil 131 may be disposed such that the relay resonant coil 131 is not coplanar with the power transmitter resonant coil 114 and the power receiver resonant coil 121, and the center axes thereof are parallel but the center axes thereof do not coincide. It is present.

11 shows a configuration and a photograph of a helical coil manufactured to have a resonance frequency at 900 kHz. The shape of the power transmitter resonant coil 114 and the power receiver resonant coil 121 can be the same. The lead wire used was a Litz wire diameter of 1mm, the diameter of the coil was 26cm, the height was 8cm, and the number of turns was 78 times. The coil's resistance is 3.2 kΩ, the inductance is 2.074 mH, and the Q-factor (2 f L / R: L = inductance, R: conduction resistance + radiation resistance) is 3670. The number of turns of the resonant coil and the source coil of the power transmission unit for magnetic induction and the device coil of the power receiving unit is one time. In particular, in order to obtain the same resonant frequency for the transmitter resonant coil 114, the power receiver resonant coil 121, and the relay resonant coil 131, the coil was wound using a cylindrical structure as shown in the figure. The helical coil as shown in FIG. 7 may be used as the transmission and reception resonance coils 114 and 121 or the relay resonance coil 131.

FIG. 12 is a view showing a region (3dB boundary line) where power transmission efficiency of 50% is seen when the resonant coil shown in FIG. 11 is used in the transmitter and receiver. Here, the 3 dB boundary of a is a result of measuring the efficiency while moving the position while parallelizing the transmission and reception resonant coils (114, 121), and the 3dB boundary of b shows the transmission and reception resonant coils (114, 121) and It is the result of measuring efficiency while moving the position vertically together. If there is a transmitter of a certain size, power can be delivered with 50% efficiency even if the receiver is located in any direction within the 3 dB boundary of the transmitter resonant coil 114. The inner space of the line indicated by the dots in FIG. 12 is a 3 dB region.

13 to 17 are examples of applications in which the transmission and reception

resonant coils

114 and 121 are arranged in a vertical or arbitrary angle rather than in a parallel arrangement to increase utilization in real life. Hereinafter, the relay resonant coil 113 may be arranged at an appropriate position around the transmission and reception

resonant coils

114 and 121 as shown in FIG. 3.

For example, as shown in FIG. 13, the power transmission unit resonant coil 114 may be installed inside the insulator wall, and the power reception unit resonance coil 121 may be installed around the inside of a desk or a space below the desk that is in contact with the wall vertically. In addition, even if an electronic device (device) is placed in a space on the desk, it can be supplied with power for charging or the like. Here, the electronic device may be a device including the device coil 122, the rectifier circuit 123, and the load 124, and the electric power induced and transmitted from the power receiving unit resonant coil 121 to the device coil 122 may be The rectifier circuit 123 may be used to charge the load 124, for example, a battery.

In addition, as shown in FIG. 14, a transmission unit resonant coil 114 may be installed inside an insulator wall, and a pad including a small power receiver resonant coil 121 may be disposed on a desk, such as a desk perpendicular to the wall. The electronic device (device) may be placed on or around the pad and supplied with power for charging purposes as described above.

In addition, as shown in FIG. 15, a transmission unit resonant coil 114 may be installed inside the insulator wall, and a container such as a basket or a cup in which the power receiver resonant coil 121 is built may be disposed on a desk that is in contact with the wall vertically. The electronic device (device) can be stored in a container, and the electric power can be supplied for the purpose of charging.

In addition, as shown in FIG. 16, a transmission unit resonant coil 114 may be installed inside one insulator wall, and a power receiver resonant coil 121 may be installed inside another insulator wall that is perpendicular to and in contact with each other. It can also power electronic devices that can be hung on walls such as electronic photo frames. Here, the electronic device that can be hung on a wall such as a wall-mounted TV or an electronic picture frame may be a device including the device coil 122, and the electric power induced by the power receiving unit resonant coil 121 to the device coil 122 may be transferred. It can be used for the operation of internal circuits or display devices of electronic equipment.

And, as shown in FIG. 17, the transmission unit resonant coil 114 may be installed inside the insulator wall, and the power receiver resonant coil 121 may be built in or around the table near the wall. ) So that the power receiver resonant coil 121 and the power transmitter resonant coil 114 are vertically arranged, and may be operated by supplying power to electronic devices such as a laptop or a mobile phone on a table.

The power receiver resonant coil 121 and the power transmitter resonant coil 114 are not to be arranged only vertically (the direction in which the coil is wound vertically), and in some cases, the power receiver resonant coil 121 and the power transmitter resonant coil 114 may be arranged at an angle and not at each other. have.

As such, by using the power receiver resonant coil 121 and the power transmitter resonant coil 114, which may be arranged vertically or at an arbitrary angle, electric power may be transmitted around the power receiver resonant coil 121 in an electromagnetic induction manner. In order to put the electronic devices having the device coil 122 so as to supply power to each electronic device, it is possible to operate the charging or electronic devices. Such a method has better advantages than aesthetical electromagnetic induction or horizontal arrangement because the transmission unit resonant coil 114 is installed in the wall to completely eliminate the wire cable. In addition, such a magnetic resonance method can be transmitted with little power loss because it is less affected by objects such as walls and desks.

As described above, in the space-adaptive magnetic resonance wireless power transmission system 100 according to the present invention, rather than adding an artificial capacitor to the coil to perform LC resonance, self-resonance (helical resonance) of the coil such as helical, spiral, etc. The transmission and reception

resonant coils

114 and 121 may be configured, and through this, the power transmission unit 110 and the power reception unit 120 may be vertically or arbitrarily arranged to be inclined at a predetermined angle. Overcoming the limitations can deliver power more efficiently than electromagnetic induction.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims

Transferring power from the source coil to the transmitter resonant coil in an electromagnetic induction manner;

Transferring power from the transmitter resonant coil to a receiver resonant coil having the same resonance frequency as the transmitter resonant coil according to self resonance coupling; And

Transmitting power from the power receiver resonant coil to a device coil of an electronic device in an electromagnetic induction manner;

And the power transmitter resonant coil and the power receiver resonant coil are arranged perpendicular to each other or inclined at a predetermined angle.
Transferring power from the source coil to the transmitter resonant coil in an electromagnetic induction manner;

Transferring power from the transmitter resonant coil to a relay resonant coil having the same resonance frequency as the transmitter resonant coil according to magnetic resonance coupling;

Transferring power from the relay resonant coil to a power receiver resonant coil having the same resonant frequency as the relay resonant coil according to magnetic resonance coupling; And

Transmitting power from the power receiver resonant coil to a device coil of an electronic device in an electromagnetic induction manner;

The relay resonant coil is a self-resonant wireless power transmission method, characterized in that arranged in the transmission unit resonant coil and the power receiver resonant coil perpendicularly or inclined at a predetermined angle.
A source coil receiving power from the source;

A transmission unit resonant coil receiving electric power from the source coil in an electromagnetic induction manner; And

A power receiver resonant coil receiving electric power at the same resonant frequency as the power transmitter resonant coil according to magnetic resonance coupling from the power transmitter resonant coil,

The power transmitter resonant coil and the power receiver resonant coil are arranged perpendicular to each other or inclined at an angle, and the power receiver resonant coil transfers power to the device coil of the electronic device in an electromagnetic induction manner. Wireless power transmission system.
A source coil receiving power from the source;

A transmission unit resonant coil receiving electric power from the source coil in an electromagnetic induction manner;

A relay resonant coil receiving electric power from the transmitter resonant coil at the same resonance frequency as the transmitter resonant coil according to a magnetic resonance mechanism; And

A power receiver resonant coil receiving electric power at the same resonant frequency as the relay resonant coil according to magnetic resonance coupling from the relay resonant coil,

The relay resonant coil may be arranged to be perpendicular to the power transmitter resonant coil and the power receiver resonant coil or inclined at a predetermined angle, and the power receiver resonant coil transfers power to the device coil of the electronic device in an electromagnetic induction manner. Magnetic resonance wireless power transmission system.
The method according to claim 3 or 4,

And a circuit for impedance matching between the source and the source coil or between the device coil and the rectifier circuit or load of the electronic device.
The method according to claim 3 or 4,

For impedance matching without an impedance matching circuit, the interval between the source coil and the transmitter resonant coil, or the number and size of windings of the source coil or the transmitter resonant coil and the power receiver resonant coil is predetermined Magnetic resonance wireless power transmission system.
The method of claim 3, wherein

At least one of the power transmitter resonant coil and the power receiver resonant coil,

Two electrodes are connected between both ends of the at least one;

And an additional lumped inductor or capacitor connected to one or both ends of each of the at least one of the at least one ends, or to the middle portion of the at least one of the at least one ends.
The method of claim 4, wherein

At least one of the power transmitter resonant coil, the power receiver resonant coil, and the relay resonant coil,

Two electrodes are connected between both ends of the at least one;

And an additional concentrated inductor or capacitor connected to one or both ends of each of the at least one of the at least one ends, or to the intermediate portion of the at least one of the at least one ends.
The method according to claim 7 or 8,

The sum of the self capacitance of the coil to which the capacitor is additionally connected and the capacitance of the added capacitor is greater than or equal to 100 pF and less than or equal to 10 nF.
The method according to claim 3 or 4,

The power transmitter resonant coil is installed inside an insulator wall, and the power receiver resonant coil is installed inside a desk or table or the space around the insulator wall, inside another insulator wall, inside a pad, or inside a container. Magnetic resonance wireless power transmission system, characterized in that all of the electronic devices around the resonant coil is supplied with power.
The method of claim 3,

The transmitter resonance coil or the receiver resonance coil has a helical or spiral form, characterized in that the magnetic resonance wireless power transmission system.
The method of claim 4, wherein

The transmitter resonance coil, the receiver resonance coil, or the relay resonance coil may include a helical or spiral form.
The method of claim 11,

The transmitter resonant coil or the receiver resonant coil is a magnetic resonance wireless power transmission system, characterized in that it comprises a form in which a predetermined wire wound around a magnetic material.
The method of claim 12,

The power transmitter resonant coil, the power receiver resonant coil, or the relay resonant coil is a magnetic resonance wireless power transmission system, characterized in that it comprises a form in which a predetermined wire wound around a magnetic material.