RU2481704C1 - Wireless electromagnetic receiver and system of wireless energy transfer - Google Patents

Wireless electromagnetic receiver and system of wireless energy transfer Download PDF

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Publication number
RU2481704C1
RU2481704C1 RU2011137641/07A RU2011137641A RU2481704C1 RU 2481704 C1 RU2481704 C1 RU 2481704C1 RU 2011137641/07 A RU2011137641/07 A RU 2011137641/07A RU 2011137641 A RU2011137641 A RU 2011137641A RU 2481704 C1 RU2481704 C1 RU 2481704C1
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Russia
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resonator
characterized
receiver
made
specified
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RU2011137641/07A
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Russian (ru)
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RU2011137641A (en
Inventor
Александр Геннадьевич Чернокалов
Михаил Николаевич Макурин
Николай Николаевич Олюнин
Владимир Яковлевич Архипенков
Ки Юнг КИМ
Юнг-Хо РЬЮ
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Корпорация "САМСУНГ ЭЛЕКТРОНИКС Ко., Лтд."
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Priority to RU2011137641/07A priority Critical patent/RU2481704C1/en
Priority claimed from US13/612,228 external-priority patent/US9509179B2/en
Publication of RU2011137641A publication Critical patent/RU2011137641A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/03Varying beside the frequency also another parameter of the oscillator in dependence on the frequency
    • H03B2201/036Varying beside the frequency also another parameter of the oscillator in dependence on the frequency the parameter being the quality factor of a resonator

Abstract

FIELD: electricity.
SUBSTANCE: system of wireless energy transfer comprising a source of an AC magnetic field and a wireless electromagnetic receiver, receiving energy from a source of an AC magnetic field, besides, the specified receiver includes the first device sensitive to an electromagnetic field, and the second device made as capable of conversion of mechanical energy into electric one, and arranged in contact with the first device, differing by the fact that the first device of the receiver represents an integral solid-state mechanical resonator, made from a magnetostrictive material, and the second device of the receiver represents a converter of mechanical energy of oscillations of the specified resonator into electrical one.
EFFECT: increased received energy by increase of receiver's good quality.
39 cl, 3 dwg

Description

The invention relates to wireless power transmission, and in particular to systems and devices used for wireless power transmission.

Systems for the transfer of electromagnetic energy are divided into radiative and non-radiative systems. Radiation systems for energy transfer are based on narrowly targeted transmitters and use electromagnetic radiation in the far zone. Non-radiative systems for energy transfer are typically based on electromagnetic induction and use a non-propagating field in the near field.

Interest in non-radiative energy transmission systems has grown substantially over the past few years, especially after the Massachusetts Institute of Technology patented a resonant energy transfer scheme (see US Pat. No. 7,741,734) [1]. The patent [1] discloses a method for transmitting electromagnetic energy, which uses a system of two resonators interacting through a non-propagating resonant field in the near field. The patent [1] also discloses some possible embodiments of electromagnetic resonance structures. Almost all other known resonant devices for wireless energy transfer are also based on electromagnetic resonance structures. It should be noted that the resonant structures that are used for wireless energy transmission systems can also be used in non-resonant systems (including radiative systems).

The main disadvantage of electromagnetic resonance structures is the difficulty in developing a sensitive electromagnetic resonator of small size with high quality factor (Q). Another disadvantage is the complexity of developing an electromagnetic resonator with high quality factor and low resonant frequency. At the same time, it is desirable to provide the highest quality factor possible to increase the efficiency of energy transfer.

The use of a mechanical resonator, excited by an external magnetic field due to the magnetostriction phenomenon, for wireless energy transfer is known from US Patent Application Laid-Open No. 20101015918 [2] and No.20090079268 [3].

The closest in its features to the claimed invention is the device described in [3]. This patent application describes a magnetoelectric multilayer device comprising at least one piezoelectric layer coated with two magnetostrictive layers. The principle of operation of this device is as follows: when placed in an external alternating magnetic field, the mechanical vibrations arising due to magnetostrictive layers are converted into voltage fluctuations in the piezoelectric layer. The disadvantage of this solution is the decrease in the quality factor of the device compared to using a single (non-composite) mechanical resonator. The decrease in the quality factor in the known solution is due to the fact that not all layers of the device resonate and vibration damping occurs in non-resonant layers.

Another disadvantage is the lack of a device that provides linear magnetostrictive properties, which reduces the sensitivity of the receiver to an alternating magnetic field.

The main task to which the claimed invention is directed is to develop a resonant receiver capable of operating in a wireless energy transmission system having a high Q factor greater than 2000 (Q> 2000) and suitable for small (~ 1 cm) and low-frequency applications ( f <1 MHz).

The technical result is achieved through the development of an improved design of a wireless electromagnetic receiver, including:

solid-state mechanical resonator made of magnetostrictive material;

a converter for converting the mechanical energy of the specified resonator into electrical energy located in close proximity to the specified solid-state mechanical resonator.

Thus, the claimed invention is based on the use of a single (non-composite) solid-state magnetostrictive resonator. Instead of the piezoelectric layer, it is proposed to use an energy converter, which is located in the immediate vicinity of the resonator and which is arranged in such a way that its presence practically does not reduce the quality factor of the resonator. This approach can significantly increase the quality factor of the receiver itself.

When the wireless electromagnetic receiver is operating, said solid-state mechanical resonator is excited by an external electromagnetic field at a frequency corresponding to the resonant frequency of said resonator.

For the effective functioning of the wireless electromagnetic receiver, it is important that the design of the specified Converter provides high quality factor of the specified resonator.

According to the claimed invention, said solid-state mechanical resonator is preferably made of magnetostrictive material with high quality factor, the value of which exceeds 2000.

According to the claimed invention, said solid-state mechanical resonator is preferably made of magnetostrictive ferrite.

According to the claimed invention, said solid-state mechanical resonator has a shape selected so that a mechanical resonance mode is excited at the operating frequency.

According to one embodiment, said solid-state mechanical resonator is in the form of a cylinder.

According to another embodiment, said solid-state mechanical resonator has a bar shape with a square cross section.

According to another embodiment, said solid-state mechanical resonator is in the form of a plate.

For the effective functioning of the wireless electromagnetic receiver, it makes sense that the specified solid-state mechanical resonator was placed in the field of a permanent magnet.

According to one embodiment, said permanent magnet is made of magnetic ceramic.

According to the claimed invention, said converter is an electret capacitor converter.

According to the claimed invention, said electret capacitor converter comprises two thin conductive layers and an electret layer fixed next to them located near the resonator.

According to one embodiment, the first conductive layer of said electret capacitor converter is a metallized surface covering at least one resonator surface.

According to another embodiment, the first conductive layer of said electret capacitor converter is a conductor mechanically connected to the surface of the resonator.

According to the claimed invention, a second conductive layer of said electret capacitor converter is located next to the resonator.

According to the claimed invention, a structure consisting of these two thin conductive layers and an electret layer forms a pre-charged capacitor.

According to the claimed invention, said two thin conductive layers of said electret capacitor converter are connected to a load.

The wireless electromagnetic receiver developed as part of the proposed solution has a higher quality factor compared to the known analogue-based receivers based on mechanical resonance. Moreover, in the inventive wireless electromagnetic receiver, it is proposed to use mechanical resonators (instead of using electromagnetic resonant structures), which are excited by a magnetic field due to the phenomenon of magnetostriction. Mechanical resonators can have a high Q factor (Q ~ 103 ÷ 104), which weakly depends on size and frequency. Thus, such resonators can find application in small and low frequency systems.

In addition, to solve this problem, a system for wireless energy transmission is also proposed, comprising:

source of alternating magnetic field,

a wireless electromagnetic receiver that receives energy from a variable magnetic field source, said receiver including:

solid-state mechanical resonator made of magnetostrictive material;

a converter for converting the mechanical energy of the specified resonator into electrical energy located in close proximity to the specified solid-state mechanical resonator.

Additionally, the wireless electromagnetic receiver included in the system may be characterized by any of the above features.

According to the present invention, it is proposed to use an electret transducer, which is a capacitor pre-charged with an electret. One conductive surface of said capacitor is a metallized surface covering at least one surface of the resonator, or a conductor mechanically connected to the surface of the resonator. Mechanical vibrations of the resonator surface create an alternating voltage on the capacitor plates.

The proposed wireless electromagnetic receiver is intended for use as an element of a wireless energy transmission system. The specified system includes a variable magnetic field source and a wireless electromagnetic receiver, made according to the present invention, which receives energy from the source. The frequency of the alternating field generated by the source corresponds to the resonant frequency of the receiver.

For a better understanding of the claimed invention the following is a detailed description with the corresponding drawings.

Figure 1 is a diagram of a wireless electromagnetic receiver with a flat solid-state magnetostrictive resonator and an electret capacitor energy converter, where:

101 - flat solid-state magnetostrictive resonator;

102 is a permanent magnet;

103 - exciting magnetic field;

104 and 105 are thin conductive layers;

106 - electret layer;

107 - load.

Figure 2 is a diagram of a wireless electromagnetic receiver with a solid-state cylindrical magnetostrictive resonator and an electret capacitor energy converter, where:

201 - solid-state cylindrical magnetostrictive resonator;

102 is a permanent magnet;

103 - exciting magnetic field;

104 and 105 are thin conductive layers;

106 - electret layer;

107 - load.

Figure 3 is a functional diagram of a wireless power transmission system containing the proposed wireless electromagnetic receiver.

103 - exciting magnetic field generated by the source;

308 — source of an alternating magnetic field;

309 is the receiver.

The first functional part of the claimed wireless electromagnetic receiver 309 is a solid state magnetostrictive resonator 101 or 201 with a permanent magnet 102 (Figure 1 and Figure 2). Solid-state resonator 101 is made of magnetostrictive material with high quality factor. For example, such a magnetostrictive material may be magnetostrictive ferrite. The resonator is preferably in the form of a plate, cylinder, rectangular bar, or other shape. The shape of the resonator is selected in such a way that a mechanical resonance mode is excited at the operating frequency f in the resonator 101. For example, for a longitudinal mechanical resonance mode, the resonator size in at least one dimension should be approximately equal to ν / (2f), where ν is the speed of sound. A mechanical resonance mode is the best for energy transfer if the energy of the mechanical vibrations of the resonator is maximum when the mode is excited.

The resonator 101 is magnetized by a permanent magnet 102 located next to it at a certain distance in order to provide the necessary magnetostrictive properties of the resonator material and to linearize the behavior of the resonator 101. The permanent magnet 102 is preferably made of ceramic material. In this case, it can be placed close to the cavity without significantly affecting the efficiency of the system.

The resonator 101 is excited by an external alternating magnetic field 103. The alternating magnetic field 103 excites mechanical vibrations in the resonator 101 due to the magnetostriction phenomenon. The amplitude of the oscillations at the resonant frequency f depends on the quality factor Q of the material of the resonator 101: the higher the quality factor, the greater the amplitude of the oscillations it provides. Thus, it is desirable to make the quality factor as high as possible. Also, the amplitude of the oscillations depends on the magnetostrictive properties of the material of the resonator 1. Therefore, it is preferable to use special magnetostrictive materials for the proposed receiver.

The second functional part of the wireless electromagnetic receiver 309 is an energy converter. In the claimed invention, it is proposed to use an electret transducer (FIG. 1 and FIG. 2), which contains two thin conductive layers 104 and 105, and an electret layer 106 fixed next to them, located close to the resonator 101. The first conductive layer 104 is a metallized surface covering at least one surface of the resonator 101, or a conductor mechanically connected to the surface of the resonator 101. The second conductive layer 105 is located next to the resonator 101 so that the system consisting of conductive layers 104 and 105 and an electret layer formed previously charged capacitor. The electret layer 106 is fixed to the second conductive layer 105. This combined structure of the transducer helps to ensure that the quality factor of the resonator is not reduced. Mechanical vibrations of the surface of the resonator 101 with conductive layers 104 and 105 cause voltage fluctuations in the capacitor. The conductive layers 104 and 105 are connected to a load 107.

The proposed wireless electromagnetic receiver 309 can be used as an element of a wireless power transmission system.

Such a wireless power transmission system (FIG. 3) includes a variable magnetic field source 308 and an inventive wireless electromagnetic receiver 309 according to the present invention, which receives energy from a source 308. The frequency of the alternating field generated by the source 308 corresponds to the resonant frequency of the receiver 309 . It is possible to use various sources of alternating magnetic field.

- The source may be a non-radiative resonant structure with a frequency f located at a distance that is less than the wavelength λ = c / f, where c is the speed of light. In this case, the source and receiver form a resonant energy transfer system.

- The source may be a non-radiative non-resonant structure. For example, it can be a coil connected to a generator and located at a distance that is less than the wavelength λ = c / f.

- The source may be a radiative structure with a frequency f located at a distance that is greater than the wavelength λ = c / f.

Thus, the inventive receiver, which is a key element of a wireless energy transmission system, consists of two components: a solid-state resonator excited by an external alternating magnetic field through magnetostriction, and an energy converter for converting the mechanical energy of the resonator into electrical energy. The receiver is characterized by using a high-quality mechanical solid-state resonator to receive electromagnetic energy using the magnetostriction phenomenon.

The claimed invention can find application in wireless power transmission systems, in particular, it allows you to power low-power compact devices without the use of wires. Moreover, the claimed solution is particularly suitable for use in areas where it is preferable to use low frequencies, for example in biological systems.

Claims (39)

1. A wireless electromagnetic receiver including a device that is sensitive to an electromagnetic field, and a second device configured to convert mechanical energy into electrical energy and in contact with the first device, characterized in that the first device is a solid-state mechanical resonator made from a magnetostrictive material, and the second device is a converter of mechanical vibrational energy of the specified resonator into electrical th.
2. The receiver according to claim 1, characterized in that the one-piece solid-state mechanical resonator is made with the possibility of excitation from an external electromagnetic field at a frequency corresponding to the resonant frequency of the specified resonator.
3. The receiver according to claim 1, characterized in that said converter is configured to maintain a high quality factor of said resonator.
4. The receiver according to claim 1, characterized in that said one-piece solid-state mechanical resonator is made of magnetostrictive material with high quality factor, the value of which exceeds 2000.
5. The receiver according to claim 1, characterized in that said one-piece solid-state mechanical resonator is made of magnetostrictive ferrite.
6. The receiver according to claim 1, characterized in that said one-piece solid-state mechanical resonator has a shape selected so that a mechanical resonance mode is excited at the operating frequency.
7. The receiver according to claim 6, characterized in that the said one-piece solid-state mechanical resonator is made in the form of a cylinder.
8. The receiver according to claim 6, characterized in that the said one-piece solid-state mechanical resonator is made in the form of a bar with a square cross section.
9. The receiver according to claim 6, characterized in that the said one-piece solid-state mechanical resonator is made in the form of a plate.
10. The receiver according to claim 1, characterized in that the said one-piece solid-state mechanical resonator is made with the possibility of magnetization from a permanent magnet.
11. The receiver of claim 10, characterized in that the said permanent magnet is made of magnetic ceramic.
12. The receiver according to claim 1, characterized in that said mechanical energy converter is an electret capacitor converter.
13. The receiver of claim 12, wherein said electret capacitor converter comprises two thin conductive layers and an electret layer fixed next to them.
14. The receiver according to item 13, wherein the first conductive layer of the specified electret capacitor converter is a metallized surface covering at least part of the surface of the resonator.
15. The receiver according to item 13, wherein the first conductive layer of the specified electret capacitor transducer is a conductor mechanically connected to the surface of the resonator.
16. The receiver according to item 13, wherein the second conductive layer of the specified electret capacitor transducer does not mechanically contact with the resonator.
17. The receiver according to any one of paragraphs.13-16, characterized in that the structure consisting of these two thin conductive layers and an electret layer forms a pre-charged capacitor.
18. The receiver of claim 13, wherein said two thin conductive layers of said electret capacitor converter are connected to a load.
19. A wireless energy transmission system comprising an alternating magnetic field source and a wireless electromagnetic receiver receiving energy from an alternating magnetic field source, said receiver including a first electromagnetic field sensitive device and a second device configured to convert mechanical energy into electrical and in contact with the first device, characterized in that the first device of the receiver is a solid solid state a mechanical resonator made of magnetostrictive material, and the second device of the receiver is a converter of mechanical vibrational energy of the specified resonator into electrical one.
20. The system according to claim 19, characterized in that the said one-piece solid-state mechanical resonator is made with the possibility of excitation from an external electromagnetic field at a frequency that corresponds to the resonant frequency of the specified resonator.
21. The system according to claim 19, characterized in that said converter is configured to maintain high quality factor of said resonator.
22. The system according to claim 19, characterized in that said one-piece solid-state mechanical resonator is made of magnetostrictive material with high quality factor, the value of which exceeds 2000.
23. The system according to item 22, wherein the specified one-piece solid-state mechanical resonator is made of magnetostrictive ferrite.
24. The system according to claim 19, characterized in that said one-piece solid-state mechanical resonator has a shape selected so that a mechanical resonance mode is excited at the operating frequency.
25. The system according to paragraph 24, wherein the specified one-piece solid-state mechanical resonator is made in the form of a cylinder.
26. The system according to paragraph 24, wherein the specified one-piece solid-state mechanical resonator is made in the form of a bar with a square section.
27. The system according to paragraph 24, wherein the specified one-piece solid-state mechanical resonator is made in the form of a plate.
28. The system according to claim 19, characterized in that the said one-piece solid-state mechanical resonator is made with the possibility of magnetization from a permanent magnet.
29. The system of claim 28, wherein said permanent magnet is made of magnetic ceramic.
30. The system according to claim 19, characterized in that the converter is made in the form of an electret capacitor converter.
31. The system of claim 30, wherein said electret capacitor converter comprises two thin conductive layers and an electret layer fixed next to them.
32. The system of claim 31, wherein the first conductive layer of said electret capacitor is a metallized surface covering at least a portion of the surface of the resonator.
33. The system according to p. 31, characterized in that the first conductive layer of the specified electret capacitor transducer is a conductor mechanically connected to at least part of the surface of the resonator.
34. The system according to p. 31, characterized in that the second conductive layer of the specified electret capacitor transducer does not mechanically contact with the resonator.
35. The system according to any one of paragraphs.31-34, characterized in that the structure consisting of these two thin conductive layers and an electret layer forms a pre-charged capacitor.
36. The system of claim 31, wherein said two thin conductive layers of said electret capacitor converter are connected to a load.
37. The system according to claim 19, characterized in that the source of the alternating magnetic field is a non-radiating resonant structure with a frequency f located at a distance that is less than the wavelength λ = c / f, where c is the speed of light.
38. The system according to claim 19, characterized in that the source of the alternating magnetic field is a non-radiative nonresonant structure located at a distance that is less than the wavelength λ = c / f, where c is the speed of light.
39. The system according to claim 19, characterized in that the source of the alternating magnetic field is a radiative structure with a frequency f located at a distance that is greater than the wavelength λ = c / f, where c is the speed of light.
RU2011137641/07A 2011-09-13 2011-09-13 Wireless electromagnetic receiver and system of wireless energy transfer RU2481704C1 (en)

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RU2011137641/07A RU2481704C1 (en) 2011-09-13 2011-09-13 Wireless electromagnetic receiver and system of wireless energy transfer
KR1020120083076A KR101952593B1 (en) 2011-09-13 2012-07-30 Wireless electromagnetic receiver and wireless power transfer system
US13/612,228 US9509179B2 (en) 2011-09-13 2012-09-12 Wireless electromagnetic receiver and wireless power transfer system

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US9667085B2 (en) 2013-06-19 2017-05-30 Samsung Electronics Co., Ltd Wireless charger for electronic device
US10186371B2 (en) 2013-07-08 2019-01-22 Samsung Electronics Co., Ltd. Magnetic field generation apparatus having planar structure

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US10186371B2 (en) 2013-07-08 2019-01-22 Samsung Electronics Co., Ltd. Magnetic field generation apparatus having planar structure

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RU2011137641A (en) 2013-03-20
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