KR102109104B1 - Apparatus for transferring power - Google Patents

Abstract

The present invention relates to a wireless power transmission device that can significantly reduce the resonance size while reducing the resonance frequency of the resonator.
To this end, a wireless power transmission apparatus according to an embodiment of the present invention is installed on any one side wall in a predetermined space, and has a transmission feeding loop for transmitting impedance matching and power, and impedance matching and power using a transmitting feeding loop. A transmission resonator that receives and transmits, and is installed on the other side wall in a predetermined space, has the same resonance frequency as the transmission resonator, and generates a resonance between each other through resonance characteristics of the transmission resonator to store energy in a predetermined space The resonator may include at least one resonator installed inside a predetermined space, having the same resonant frequency as the transmission resonator, and receiving energy stored in the predetermined space.

Description

Wireless power transmission device {APPARATUS FOR TRANSFERRING POWER}

The present invention relates to wireless power transmission, and more specifically, by installing a transmission resonator in which a porter matching and resonance matching circuit is added to a spiral coil structure between a transmission resonator and a relay resonator spaced apart by a predetermined distance, power in an arbitrary space is provided. It relates to a wireless power transmission apparatus in any three-dimensional space that can supply.

Energy is a vocabulary that describes the ability to do work, and is a physical term such as heat, electricity, and power. Examples of such energy in modern times include various types of energy such as electric energy, thermal energy, hydro energy, and thermal energy.

Of these energies, electrical energy is transmitted through a conductor through which current can flow.

As another method of electric energy transfer, there is a method of using an electric field to generate electric power. This is a technique that transmits power from one side to the other by a primary coil and a secondary coil by using induced electromotive force induced by a magnetic field and an electric field. Basically, the technique used in power plants and the like was the most representative method.

Another method of transmitting energy wirelessly is a radio wave technology that transmits a signal of constant power over the air. Although this radio wave technology is widely used in a wireless communication method, it is not actually an efficient energy transmission method.

Meanwhile, a new method for delivering power at MIT was developed in 2007. In the new method, energy is transmitted wirelessly, and unlike conventional antennas, magnetic resonance is mainly performed using two magnetic resonators having the same frequency to transmit wireless energy by mutual resonance. This method, published by MIT, has a helical structure, the resonant frequency is 10 MHz, and the structural helical resonator size of the resonator is 600 mm in diameter, the helical is 5.25 turns, the line thickness is 6 mm, and the total helical thickness is 200. The single loop of feeding of the mm signal is 250 mm.

However, the above method developed by MIT has a problem that the size and the resonance frequency have an inappropriate size and the resonance frequency in order to be applied to a real product. That is, the resonance body for wireless transmission of electric power is too large, and the resonance frequency is the frequency most sensitive to human influence. In order to transmit wireless power in a real product, it is desirable to use a resonance frequency of 10 MHz or less. However, the size of the resonance structure is a function of the resonance frequency. That is, in order to lower the resonance frequency developed by MIT, that is, to lower the resonance frequency, there is a problem that the size of the resonance structure increases.

The Korea Electronics and Telecommunications Research Institute (Public Publication No. 2012-0010652) provides a wireless power transmission device and a method for reducing the resonance size while reducing the resonance frequency of the resonator, and a method for manufacturing the same. In the present invention, a technique for various design and manufacturing methods of a wireless power transmission device capable of reducing the resonance size while reducing the resonance frequency of the resonator is described.

To solve the above problems, an object of the present invention is to provide a wireless power transmission device that can significantly reduce the resonance size while reducing the resonance frequency of the resonator.

In addition, the present invention is a wireless power capable of satisfying both the problem of the size of the resonator and the transmission distance efficiency problem by freely transmitting a wireless power at a distance greater than the diameter of the ultra-small resonator at any place using the ultra-small resonator. The purpose is to provide a transmission device.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, a wireless power transmission apparatus according to an embodiment of the present invention is installed on one side wall in a predetermined space, and has a transmission feeding loop for transmitting impedance matching and power, and the transmission feeding loop is provided. A transmission resonator that receives and transmits the impedance matching and power, and is installed on another sidewall in the predetermined space, has the same resonant frequency as the transmission resonator, and mutual resonance phenomenon through resonance characteristics of the transmission resonator. And a relay resonator that generates energy to store energy in the predetermined space, and at least one reception resonator installed in the predetermined space, having the same resonance frequency as the transmission resonator, and receiving energy stored in the predetermined space. can do.

In the wireless power transmission apparatus according to the embodiment of the present invention, the reception resonator has a structure of a direct feeding method.

In the wireless power transmission apparatus according to an embodiment of the present invention, the resonance frequency is 1.7 MHz-1.8 MHz.

In the wireless power transmission apparatus according to an embodiment of the present invention, the receiving resonator is attached to a robot or a moving object in the predetermined space.

In the wireless power transmission apparatus according to an embodiment of the present invention, the transmission resonator and the transmission feeding loop are characterized by being sealed by a shield or shielding sheet for shielding the electromagnetic field generated therefrom.

In the wireless power transmission apparatus according to an embodiment of the present invention, the relay resonator is characterized by being sealed by a shield or shielding sheet for shielding the electromagnetic field generated by itself.

In the wireless power transmission apparatus according to an embodiment of the present invention, the receiving resonator is characterized in that the diameter is 50mm-70mm.

According to another aspect of the present invention, a wireless power transmission device according to an embodiment of the present invention is a device for wirelessly transmitting power to a mobile body having a wheel, and a first stator for fixing a part of the wheel It is installed, and has a transmission feeding loop for transmitting impedance matching and power, and a transmission resonator for receiving and transmitting the impedance matching and power using the transmission feeding loop, and for fixing the other part of the wheel. A repeater resonator installed in a stator, having the same resonant frequency as the transmission resonator, and generating mutual resonance through resonance characteristics with the transmission resonator to store energy in a space between the first and second stators,

It is installed on the wheel fixed by the first and second stators, has at least one reception resonator having the same resonance frequency as the transmission resonator, and receiving energy stored in a space between the first and second stators. Can be.

The wireless power transmission apparatus according to the present invention has an advantage that it can be applied to a small device through miniaturization, and thereby has a cost reduction effect. In addition, it has a resonance frequency lower than that of the conventional MIT structure helical structure, the volume can be significantly reduced to provide a commercially available wireless power device and method.

In addition, the wireless power transmission apparatus according to the present invention can not only distribute the energy evenly in a specific space because the transmission feeding loop is installed only in the transmission resonator, but also by installing the reception resonator in the space, a number of wireless devices and electronic devices in the space Power.

1 is a view showing the structure of a wireless power transmission apparatus using a resonator according to an embodiment of the present invention,
2 is a structure of wireless power transmission using a general magnetic resonance,
3 is a view showing a result of manufacturing a small resonator according to an embodiment of the present invention,
4 is a view showing the structure of a wireless power transmission apparatus according to another embodiment of the present invention,
5 is a view showing that a wireless power transmission apparatus according to an embodiment of the present invention can be tested in an actual structure by using it,
6 is a view showing that the use of a wireless power transmission apparatus according to an embodiment of the present invention in a real structure is tested with another small resonator
7 is a view showing the results of measuring the power transmission efficiency by using a small resonator in Figure 5 with a network analyzer (Network Analyzer),
8 is a diagram illustrating an example in which a wireless power transmission apparatus according to an embodiment of the present invention is applied,
9 is a view showing another embodiment to which a wireless power transmission apparatus according to an embodiment of the present invention is applied,
FIG. 10 is a diagram illustrating content of shielding wireless power for human body protection and device protection when power is wirelessly transmitted within a predetermined area.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, with reference to the accompanying drawings, by using the ultra-small resonator freely transmits wireless power at a distance greater than the diameter of this ultra-small resonator, both the size of the resonator and the problem of transmission distance efficiency can be satisfied. A description will be given of a wireless power transmission device.

1 is a view showing the structure of a wireless power transmission apparatus using a resonator according to an embodiment of the present invention.

As shown in FIG. 1, the wireless power transmission apparatus may include a transmission resonator 102 having a transmission feeding loop 101, a relay resonator 103, a reception resonator 104, and the like.

In order to clarify the differences between the structure of the wireless power transmission apparatus and the structure of the general wireless power transmission according to the embodiment of the present invention, the structure of the wireless power transmission using the general magnetic resonance will be described with reference to FIG. 2.

2 is a structure of wireless power transmission using a general magnetic resonance, and may include two transmission and reception resonators 202 and 203 and two feeding loops 201 and 204 for impedance matching and power transmission.

As described above, a wireless power transmission apparatus using a general magnetic resonance has two feeding loop structures for impedance matching and transmission and reception of power and transmission and reception resonators as shown in FIG. 2, but wireless power according to an embodiment of the present invention The transmitting device has a transmitting feeding loop 101 only in the transmitting resonator 102. That is, the wireless power transmission apparatus according to an embodiment of the present invention serves as a repeater without a feeding loop on the receiving resonator side, and a resonator that actually receives power may be disposed between the transmitting resonator 102 and the relay resonator 103. have.

The transmission resonator 102 according to an embodiment of the present invention may be installed on any one side wall in an arbitrary space 105, and has a transmission feeding loop 101 for transmitting impedance matching and power, and a transmission feeding loop The 101 can stably transmit impedance matching and power to the transmission resonator 102.

The transmission resonator 102 has the same resonance frequency as the relay resonator 103, and may generate a mutual resonance phenomenon according to the mutual resonance characteristics using the resonance frequency. Due to the mutual resonance phenomenon, energy may be stored in the space 105 between the transmission resonator 102 and the relay resonator 103. This energy may be transmitted to the reception resonator 104 installed inside the space 105.

The relay resonator 103 is installed to be spaced apart from the transmission resonator 102 at a predetermined distance, for example, may be installed on the opposite side wall in the space 105. The relay resonator 103 has the same resonant frequency as the transmission resonator 102 and may generate mutual resonance through resonance characteristics with the transmission resonator 102 to store energy in the space 105. The energy thus stored may be transmitted to the receiving resonator 104 installed in the space 105.

The reception resonator 104 has a very small size compared to the transmission resonator 102 and may have the same frequency as the transmission resonator 102. Here, it is preferable that the resonance frequency has 1.7 MHz-1.8 MHz.

In addition, the reception resonator 104 may be installed between the transmission resonator 102 and the relay resonator 103, that is, inside the space 105, and may receive energy stored in the space 105.

The reception resonator 104 may have a direct feeding method structure, for example, a C-C matching structure.

The structure of the small reception resonator 104 applied to the embodiment of the present invention is as shown in FIG. 3.

3 is a view showing a result of manufacturing a small resonator according to an embodiment of the present invention, and is a structure miniaturized through C-C matching. That is, as shown in FIG. 3, from the LC point of view of resonance, in order to be resonant, the imaginary part of the impedance must be zero while the inductance L and the capacitance C are present. First, the complex impedance is as shown in Equation 1 below.

In Equation 1, the frequency at which the imaginary impedance X becomes 0 and disappears is a resonance frequency, and the imaginary impedance X is as shown in Equation 2 below.

If the above equation (2) is summarized as the frequency (f), the resonance frequency may be determined as shown in equation (3) below.

In the case of manufacturing the magnetic resonator in Equation 3 above, a resonator is manufactured using a parasitic capacitance C and having a sufficient inductance L value for manufacturing a resonator having a high Q value. For example, in order to implement a resonator having a high Q value, a coil design having a structure in which the coil's own inductance (L) value is large may be an important design factor. If the imaginary impedance is set to 0 in the complex impedance equation of Equation 1 above, a resonance condition can be created. If the small-sized receiving resonator 104 is a device composed of inductance L, it may be possible to secure resonance by securing additional capacitance C to obtain resonance at a desired frequency. When the complex impedance Z is R + jX, resonance can be generated by configuring the porter as R-jX. If the resonance frequency is 1.8 MHz and the diameter of the small receiving resonator 104 is very small between 50 mm and 70 mm, the Q value may have 100 or more.

In the embodiment of the present invention, although it has been described as an example that energy is transmitted using one small reception resonator 104, a plurality of small reception resonators 104 may be installed inside the space 105, thereby allowing multiple Can transfer power. That is, as shown in FIG. 4, a plurality of small receiving resonators 304, 305, and 306 may exist between the transmitting resonator 102 and the relay resonator 103, and these small receiving resonators 1304, 305, and 306 ) May be able to receive power freely at different locations. Also, the small reception resonators 304, 305, and 306 may receive power in parallel.

An example in which a wireless power transmission apparatus having the above-described structure is actually applied will be described with reference to FIGS. 5 to 7.

FIG. 5 is a diagram showing experimentally evaluating whether a wireless power transmission apparatus according to an embodiment of the present invention can be used in an actual structure.

As shown in FIG. 5, the transmission resonator 402 has an actual diameter of 300 mm, and the relay resonator 403 also has a diameter of 300 mm. At this time, any one small receiving resonator 404 used has a diameter of 130 mm, and the other small receiving resonator 405 has a diameter of 70 mm. In this case, it was confirmed that more than 60% of the power transmission efficiency is transmitted anywhere within the dotted box structure. At this time, when the transmission resonator 403 and the relay resonator 404 are raised to a diameter of 2 m or 4 m, they are installed on both side walls of one room in the house or one of the offices to transmit power wirelessly to a small reception resonator anywhere in the room or office. Can receive

6 is a view showing that the use of a wireless power transmission apparatus according to an embodiment of the present invention in an actual structure is tested with another small resonator.

As shown in Fig. 6, the transmission resonator 502 has an actual diameter of 300 mm, and the relay resonator 503 also has a diameter of 300 mm. At this time, the small resonator 504 used has a diameter of 50 mm, and the other small resonator 505 has a diameter of 70 mm. Even in this case, it was confirmed that more than 60% of the power transmission efficiency is transmitted anywhere within the dotted box structure.

7 is a view showing the results of measuring the power transmission efficiency by using a small resonator 404 in FIG. 5 with a network analyzer, a resonance frequency occurs near 1.758 MHz and its insertion loss S21 is -0.8752 When it is dB, it has a power transmission efficiency of 82%.

An example in which a wireless power transmission apparatus having the above-described structure is applied will be described with reference to FIGS. 8 to 10.

8 is a view showing an example in which a wireless power transmission apparatus according to an embodiment of the present invention is applied, the transmission resonator 602 is installed on the wall surface of an office or room, and the relay resonator 603 is installed on the opposite wall surface. When the resonator 605 according to an embodiment of the present invention is mounted inside a mobile body 604 such as a robot located inside an office or room in a state in which the mobile body 604 may be wirelessly supplied with power. At this time, the resonator 605 mounted on the mobile body 604 has a very small feature compared to the transmission resonator 602, and is the same as the resonance frequency of the transmission resonator 602.

9 is a view showing another embodiment in which a wireless power transmission apparatus according to an embodiment of the present invention is applied, and shows a wireless power transmission structure of a bicycle.

9, if the bicycle is parked in a bicycle parking lot, first and second stators 701 and 705 for fixing the bicycle wheels 704 are installed in the bicycle parking lot. Using this, a transmission resonator 702 is installed on one side of the first stator 701, a relay resonator 703 is installed on the second stator 705, and a small resonator 704a is installed on the bicycle wheel 704 therebetween. ), You can receive power wirelessly.

FIG. 10 illustrates content of shielding wireless power for human body protection and device protection when power is wirelessly transmitted within a certain area. The rear portions of the transmission resonator 803 and the transmission feeding loop 802 are shielded with electromagnetic fields exposed to the rear and side by using a shield or a shield sheet 806.

In addition, in the case of the relay resonator 804, it is possible to reduce electromagnetic waves exposed to the rear and side by installing a shield or a shielding sheet 806 toward the rear. The reception resonator 805 is installed in the same space 801, and power is wirelessly transmitted from anywhere in the space 801.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You will understand.

101, 201, 802: transmit feeding loop
102, 202, 302, 402, 502, 602, 702, 803: transmission resonator
103, 303, 403, 503, 603, 703, 804: relay resonator
104, 304, 305, 306, 404, 504, 605, 704a, 805: receive resonator
806: shielding sheet

Claims (7)

delete It is installed on any one side wall in a predetermined space, and has a transmission feeding loop for transmitting impedance matching and power, and a transmission resonator for transmitting the power provided through the transmission feeding loop,
It is installed on a side wall opposite to any one side wall where the transmission resonator is installed in the predetermined space, and has the same resonant frequency as the transmission resonator, thereby storing energy in the predetermined space through a mutual resonance phenomenon generated through resonance characteristics of the transmission resonator. Relay resonator -the diameter of the relay resonator and the transmission resonator are the same-
Including,
When a reception resonator is disposed between the transmission resonator and the relay resonator in the predetermined space, the reception resonator receives energy stored in the predetermined space,
The reception resonator is a wireless power transmission device disposed between the transmission resonator and the relay resonator spaced apart from the transmission resonator and the relay resonator. According to claim 2,
The reception resonator is a wireless power transmission device having a smaller diameter than the transmission resonator and relay resonator. delete delete According to claim 2,
The transmission resonator and the transmission feeding loop are sealed by a shielding agent or a shielding sheet to the rear portion of the transmission resonator and the transmission feeding loop, so that an electromagnetic field generated by itself is transmitted to the rear and side of the transmission resonator and the transmission feeding loop. A wireless power transmission device that is shielded from being exposed. According to claim 2,
A plurality of the reception resonators are disposed at different positions in the predetermined space, and may have different diameters, and a wireless power transmission device that receives power in parallel within the predetermined space.

Images