KR101741768B1 - Apparatus for Wide Area Wireless Power Transmission and Reception - Google Patents
Apparatus for Wide Area Wireless Power Transmission and Reception Download PDFInfo
- Publication number
- KR101741768B1 KR101741768B1 KR1020150052323A KR20150052323A KR101741768B1 KR 101741768 B1 KR101741768 B1 KR 101741768B1 KR 1020150052323 A KR1020150052323 A KR 1020150052323A KR 20150052323 A KR20150052323 A KR 20150052323A KR 101741768 B1 KR101741768 B1 KR 101741768B1
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- wireless power
- magnetic field
- metal plate
- power transmission
- core
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 74
- 238000004804 winding Methods 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims description 70
- 239000002184 metal Substances 0.000 claims description 70
- 230000004907 flux Effects 0.000 claims description 65
- 238000000034 method Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- H02J17/00—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H02J7/025—
Abstract
A wide area wireless power transceiver is disclosed.
According to an aspect of the present invention, there is provided a wireless power transmission / reception apparatus including a core portion including a plurality of cores having a length longer than a width and a thickness, the core portion having the plurality of cores arranged in a grid structure, And a winding unit wound around each core included in the core unit and generating a magnetic field by receiving an alternating current power or receiving a magnetic field to induce a power source. The main object of the present invention is to provide a wireless power transmitting / .
Description
The present embodiment relates to an apparatus for transmitting power wirelessly or receiving transmitted power over a wide area.
The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.
Wireless power transmission refers to the technology of supplying electric power to household electric appliances or electric vehicles wirelessly instead of the conventional wired electric power line and it is possible to use various types Wireless power transmission is being developed. Particularly, there is a growing interest in long-distance wireless power transmission that can maximize the user's convenience, and researches related thereto have been actively conducted.
The magnetic induction method of the wireless charging technique generates an alternating magnetic field in the wireless power transmission device, thereby transferring energy by inducing an electromotive force according to the change of the magnetic field in the wireless power receiving device. Typical coil types for wireless power technology are loop coils and dipole coils. When the loop coil is used, the magnetic field size decreases by a factor of 2 ~ 3, when the loop coil is used. However, when the dipole coil structure is used, the magnetic field is decreased by 1 ~ 2, The coil structure is excellent. However, the existing single dipole coil structure has a limitation in providing a magnetic field in only one direction and providing a wide range of wireless power transmission environments. Therefore, in order to provide a wide range of wireless charging space that can increase user convenience, it is necessary to provide an omnidirectional wireless charging environment, to generate a uniform magnetic field over a wide range, and to reduce the loss of cores generated in a wireless power transmission device .
The purpose of this embodiment is to create an omnidirectional wireless charging environment by using the generation of a rotating magnetic field in a space where electric power is to be transmitted using the multi core and winding structure, and to provide a wide range of uniform magnetic fields .
According to another aspect of the present invention, there is an object to improve the reception efficiency of the magnetic flux by minimizing the leakage component of the received magnetic flux by receiving the magnetic flux using the multi-core and winding structure.
According to another aspect of the present invention, a metal plate using a material having high electrical conductivity, such as a copper plate or an aluminum plate, is provided on one side of the core portion to increase the magnetic flux density of the magnetic flux radiated by the wireless power transmission device, The objective is to reduce the core loss by reducing the internal magnetic flux density of the transmitting device.
According to another aspect of an embodiment of the present invention, a metal plate using a material having high electrical conductivity such as a copper plate or an aluminum plate is installed on one side of a wireless power receiving apparatus to shield a magnetic field generated from the wireless power receiving apparatus There is a purpose.
According to an aspect of the present invention, there is provided a wireless power transmission / reception apparatus including a core portion including a plurality of cores having a length longer than a width and a thickness, the core portion having the plurality of cores arranged in a grid structure, And a winding unit wound around each core included in the core unit and generating a magnetic field by receiving an alternating current power or receiving a magnetic field to induce a power source.
According to another aspect of the present invention, there is provided a wireless power transmission apparatus including: a core including a plurality of cores having a length longer than a width and a thickness, the core including a plurality of cores arranged in a grid structure; And a winding part wound around each core included in the core part and generating a magnetic field by receiving AC power.
According to another aspect of the present invention, there is provided a wireless power receiving apparatus including a plurality of cores each having a length longer than a width and a thickness, the core including a plurality of cores arranged in a grid structure, And a winding part wound around each core included in the core part and receiving a magnetic field to induce a current.
As described above, according to one aspect of the present invention, there is an advantage that a uniform magnetic field can be provided in a corresponding space by providing a uniform magnetic field in two directions using a wireless power transmission device.
According to another aspect, there is an advantage that a three-way omnidirectional wireless power transmitting / receiving device can be implemented by using a two-direction receiving device of two-directional magnetic fields generated by a transmitting device in receiving a magnetic field.
According to another aspect, by providing the metal plate on one side of the core portion, the loss inside the core portion is reduced and the magnetic flux density of the magnetic flux emitted by the wireless power transmission device is advantageously increased.
According to another aspect of the present invention, by providing the metal plate on one side of the wireless power receiving apparatus, it is possible to shield the magnetic field generated by the wireless power receiving apparatus behind the metal plate to secure the human body against the magnetic field and minimize the influence of the operation of the electronic apparatus There are advantages to be able to.
1 is a block diagram of a wireless power transceiver according to an embodiment of the present invention.
2 is a diagram illustrating a normalized magnetic field emitted by a wireless power transmission apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a wireless power receiving apparatus receiving a magnetic field according to an embodiment of the present invention.
4 is a diagram illustrating an equivalent magnetic circuit model of a wireless power receiving apparatus according to an embodiment of the present invention.
FIGS. 5A and 5B are diagrams illustrating respective radio power transmission / reception apparatuses having a difference in whether a metal plate is positioned according to an embodiment of the present invention.
FIGS. 6A and 6B are diagrams showing equivalent magnetic circuit models of respective radio power transmission apparatuses, which differ according to whether or not a metal plate is positioned according to an embodiment of the present invention.
FIGS. 7a and 7b illustrate a normalized magnetic flux density radiated by each of the radio power transmission apparatuses having a difference in whether or not a metal plate is positioned according to an embodiment of the present invention, At a distance of half the width or length of the device.
FIG. 8 is a diagram illustrating a variation of the normalized magnetic flux density inside each radio power transmission apparatus having a difference in whether or not a metal plate is positioned according to an embodiment of the present invention.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
In addition, throughout the specification, it is to be understood that when an element is referred to as being "comprising" or "comprising", it should be understood that it does not exclude other elements, it means. In addition, '... Quot ;, " module ", and " module " refer to a unit that processes at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.
1 is a block diagram of a wireless power transceiver according to an embodiment of the present invention.
Referring to FIG. 1, a wireless power transceiver according to an embodiment of the present invention includes a
The
To generate long-distance power transmission, a strong magnetic field should be generated. However, the winding itself is a problem because a large magnetoresistance occurs in the space inside the winding. A long core is inserted into the winding to reduce this magnetoresistance. The magnetic flux density is increased by reducing the magnetoresistance of the winding in which the core is inserted. Also, in the case of a loop transmission coil module, which is a general transmission coil module structure, the magnetic field is inversely proportional to the cubic (R 3 ) of the distance R with respect to the x-axis direction. However, the magnetic field generated in the straight type
The wireless power receiving apparatus receives a magnetic field and uses the received magnetic field to derive a power (current). However, as described above, since the winding itself generates a large magnetic resistance in the space inside the winding, the efficiency of inducing the power source is lowered. A long core is inserted inside the winding to reduce this magnetoresistance. The inserted core reduces the magnetoresistance of the internal space of the winding, and can receive a larger amount of magnetic field than the same external flux environment.
The first winding
2 is a diagram illustrating a normalized magnetic field emitted by a wireless power transmission apparatus according to an embodiment of the present invention.
In Fig. 1, the core portion in which the first winding portion and the second winding portion are wound radiates a magnetic field in the z-axis direction from one end of each core to the other end. When each core emits a magnetic field, an AC power source having a phase difference of 90 degrees is supplied to the first winding section and the second winding section. For example, when an AC power source such as the following
As can be seen from Equations (1) and (2), the AC power applied to the first winding portion and the second winding portion is the same in size, but has a phase difference of 90 degrees. Since the alternating current power having the phase difference of 90 degrees is applied to the first winding portion and the second winding portion, the magnetic field generated in the core portion wound with the first winding portion or the second winding portion also has a phase difference of 90 degrees. The magnetic field generated in the core portion wound with the first winding portion or the second winding portion has a phase difference of 90 degrees and the core portion in which the first winding portion or the second winding portion is wound is arranged in a lattice structure, The combined magnetic field of the magnetic field radiated by the wireless power transmission device, that is, the magnetic field radiated by the core portion wound with the first winding portion or the second winding portion, has a uniform magnetic field in a certain region as shown in FIG. 1B An omni-directional rotating magnetic field having a size is generated.
3 is a diagram illustrating a wireless power receiving apparatus receiving a magnetic field according to an embodiment of the present invention.
1, the wireless
Also, even though a single core receives a magnetic flux, a magnetic flux leaking to the surrounding air layer exists. In the wireless power receiving apparatus according to an embodiment of the present invention, the leakage flux component is minimized to increase the magnetic flux receiving efficiency . The wireless power receiving apparatus arranges the multiple cores in a lattice structure so that the magnetic flux flows to the other core than to the surrounding air layer. More specifically, for example, when a wing core arranged in the x-axis direction (the
4 is a diagram illustrating an equivalent magnetic circuit model of a wireless power receiving apparatus according to an embodiment of the present invention.
The equivalent magnetic circuit shown in Fig. 4 is an equivalent magnetic circuit for any one of x-axis direction and y-axis direction of the wireless power receiving apparatus shown in Fig. 3, and the number of cores arranged in the x- As shown in Fig. 3, m is not fixed to three, and corresponds to the equivalent magnetic circuit of the wireless power receiving apparatus.
The magnetic flux flowing to the core in the wireless power receiving apparatus is as follows.
? 1 denotes a magnetic flux received by the
Therefore, the number of cores to be arranged in the x-axis direction or the y-axis direction can be selected by the user in consideration of the usage amount of the core and the reception efficiency of the magnetic flux.
As described above, the wireless power transmitting / receiving apparatus according to an embodiment of the present invention radiates a magnetic field in a space in which a magnetic field is to be radiated by using a core portion arranged in a lattice structure and a winding portion wound around the core portion, Lt; / RTI > Since the wireless power transmitting / receiving device emits a magnetic field in a space and receives a magnetic field radiated into the space, since the wireless power transmitting / receiving device according to an embodiment of the present invention occupies a certain volume in a two-dimensional space, A non-directional wireless charging environment can be realized in a three-dimensional space without occupying a large volume.
FIGS. 5A and 5B are diagrams illustrating respective radio power transmission / reception apparatuses having a difference in whether a metal plate is positioned according to an embodiment of the present invention.
5A, the
When a metal plate is used in a wireless power transmission device, the wireless power transmission device is installed in a direction opposite to the direction in which the magnetic field is intended to be radiated. As described above, the metal plate shields the impingement incident on the metal plate, so that the
When the metal plate is used in a wireless power receiving apparatus, a magnetic field radiated from the wireless power receiving apparatus is installed in a direction to shield. When a user attempts to use an apparatus such as a terminal including a wireless power receiving apparatus when a user's body accesses an arbitrary apparatus, a magnetic field is radiated from the wireless power receiving apparatus. By the magnetic field radiated from the wireless power receiving apparatus There is a fear of being affected badly. Therefore, by providing a metal plate on one side of the wireless power receiving apparatus, the magnetic field radiated from the wireless power receiving apparatus is shielded, thereby minimizing adverse effects due to the magnetic field to the user. In addition, since the magnetic field is radiated from the wireless power receiving apparatus, various circuits included in the electronic apparatuses existing in the vicinity of the wireless power receiving apparatus may be subjected to magnetic field interference by the magnetic field radiated from the wireless power receiving apparatus. Since the metal plate shields the magnetic field radiated from the wireless power receiving device, the wireless power receiving device also has a role of blocking magnetic field interference to other electronic devices existing in the vicinity.
The metal plate is not limited in size but has a size that is greater than the size of the metal plate to cover the core portion of the wireless power transmitting and receiving device and has an effect of shielding a magnetic field radiated in a direction opposite to the direction in which the wireless power transmitting / .
On the other hand, as shown in FIG. 5B, when the metal plate is not positioned in the wireless power transmission / reception device, the
The effect caused by such a difference, particularly, the effect generated in the wireless power transmission apparatus will be described with reference to FIG. 6 to FIG.
FIGS. 6A and 6B are diagrams showing equivalent magnetic circuit models of respective radio power transmission apparatuses, which differ according to whether or not a metal plate is positioned according to an embodiment of the present invention.
The magnetic flux 陸c in the core portion of the wireless power transmission apparatus in which the metal plate shown in Fig. 6A is located is obtained as follows.
NI i refers to the magnetomotive force generated in the wireless power transmission device, R C is the core portion reluctance, and R is a reluctance, R r of the atmosphere refers to the reluctance of the metal plate. The magnetic flux 陸c in the core portion has a value obtained by dividing the magnetomotive force generated in the wireless power transmission device by the sum of the magnetoresistance of the core portion, the magnetoresistance of the atmosphere, and the combined resistance of the magnetoresistance of the metal plate. At this time, since the metal plate is a highly conductive material and has a large value in comparison with the magnetoresistance of the atmosphere, the combined resistance of the magnetism resistance of the atmosphere and the magnetoresistance of the metal plate is approximated to the magnetoresistance value of the atmosphere. Therefore, finally, the magnetic flux 陸c in the core portion is approximated to a value obtained by dividing the magnetomotive force generated in the wireless power transmission device by the sum of the magnetoresistance of the core portion and the magnetic resistance of the atmosphere.
Also, the magnetic flux Φ a emitted by the wireless power transmission apparatus in which the metal plate is located is obtained as follows.
The magnetic flux emitted by the wireless power transmission device is the same as the magnetic flux inside the core portion is distributed by the magnetic resistance of the metal plate among the magnetic resistance of the atmosphere and the magnetic resistance of the metal plate. At this time, since the magnetoresistance of the metal plate has a very large value compared to the magnetism resistance of the atmosphere as described above, it is possible to approximate to the magnetoresistance of the metal plate even when the magnetoresistance of the metal plate and the magnetism resistance of the atmosphere are combined. The magnetic resistance of the portion where the metal plate is located becomes relatively large, so that most of the magnetic flux in the core portion is radiated in the atmosphere (direction in which the radio power transmission device desires to radiate), and in the direction in which the metal plate is located The magnetic flux is not radiated.
On the other hand, the magnetic flux Φ c 'inside the core portion of the wireless power transmission apparatus in which the metal plate shown in FIG. 6B is not provided is obtained as follows.
The magnetic flux Φ c 'inside the core portion corresponds to the value obtained by dividing the magnetomotive force generated in the wireless power transmission device by the sum of the magnetoresistance value of the core portion and the magnetoresistance value of half of the atmosphere. 3B is compared with the radio power transmission apparatus in which the metal plate shown in FIG. 3A is located, the magnetic flux in the core portion is the same as the radio power transmission apparatus in which the metal plate shown in FIG. The transmitting apparatus has a larger value.
Also, the magnetic flux Φ a 'emitted by the wireless power transmission apparatus in which the metal plate is located is obtained as follows.
Since the magnetic flux 陸c 'inside the core portion is divided by the magnetic resistance of the same atmosphere, the magnetic flux 陸a ' emitted by the wireless power transmission device becomes half of the magnetic flux inside the core portion. Therefore, the magnetic flux Φ a 'emitted by the wireless power transmission apparatus has a value obtained by dividing the magnetomotive force by the sum of the magnetoresistance of the core portion and the magnetism resistance of the atmosphere twice.
6A is compared with a radio power transmission apparatus in which the metal plate shown in FIG. 6A is located, the radio power transmission apparatus in which the metal plate is located is a radio power transmission apparatus in which the metal plate is not located, The magnetic flux emitted by the wireless power transmission device has a large value although the magnetic flux inside the core portion is small.
7A is a diagram showing a normalized magnetic flux density of a magnetic flux radiated by a wireless power transmission apparatus in which a metal plate is not located at a distance of half the width or the length of the wireless power transmission apparatus in the z-axis direction from the wireless power transmission apparatus, 7B is a diagram showing the normalized magnetic flux density of the magnetic flux radiated by the wireless power transmission apparatus in which the metal plate is located at a distance of half the width or the length of the wireless power transmission apparatus in the z-axis direction from the wireless power transmission apparatus.
As described above with reference to FIGS. 6A and 6B, when the magnetic flux density of the magnetic flux radiated from the wireless power transmission apparatus in which the metal plate is located is compared with FIG. 7A and FIG. 7B, The magnetic flux density of the magnetic flux emitted from the non-positioned wireless power transmission device increases. This is because even if a relatively small amount of magnetic flux is generated in the core portion in the wireless power transmission apparatus in which the metal plate is located, since the metal plate is located and the magnetic resistance of the portion where the metal plate is located is increased, (In the direction in which the wireless power transmission apparatus desires to emit the magnetic field).
FIG. 8 is a diagram illustrating a variation of the normalized magnetic flux density inside each radio power transmission apparatus having a difference in whether or not a metal plate is positioned according to an embodiment of the present invention.
Hysteresis loss is inevitably generated in the core portion depending on the magnetic flux generated in the core portion. The hysteresis loss can be calculated using the Steinmetz equation and the Steinmetz equation is as follows.
P h is the hysteresis loss, C m and C T are constants, f is the frequency of the magnetic flux change, and B peak is the maximum value of the magnetic flux density in the core portion. In the Steinmet Mets equation, since q generally equals 3, the hysteresis loss increases in proportion to the third power of the maximum magnetic flux density.
As shown in FIG. 8, it can be seen that the magnetic flux density generated in the core portion is smaller than that of the wireless power transmission device in which the metal plate is not located. Considering that the hysteresis loss is proportional to the third power of the magnetic flux density, it is possible to considerably reduce the hysteresis loss occurring in the wireless power transmission apparatus due to the position of the metal plate have.
The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.
100: wireless
115:
130a to 130f: second winding portion 210: metal plate
420, 440: winding part
Claims (15)
A core portion including a plurality of cores having a length longer than a width or a thickness, the core comprising a plurality of cores arranged in a grid structure; And
And a second winding portion wound on each of the plurality of cores arranged in a direction different from a predetermined direction of the lattice structure, wherein the first winding portion is wound on each of the plurality of cores arranged in a predetermined direction of the lattice structure, And an AC power source having a phase difference of 90 degrees is applied to each of the first winding portion and the second winding portion to generate an omni-directional rotating magnetic field,
Wherein the wireless power transmission device comprises:
Wherein,
And an AC power source having a phase difference of 90 degrees is applied to the first winding section and the second winding section to generate a non-directional rotating magnetic field.
And a metal plate positioned at a predetermined distance from the core portion on one side of the core portion.
The metal plate may include:
And generates a magnetic field in a direction opposite to a direction of incidence to the metal plate by generating an eddy current by receiving a magnetic field incident on the metal plate from the winding portion.
The metal plate may include:
Wherein the magnetic flux density in the core portion is decreased and the magnetic field transmitted by the winding portion is increased by increasing the magnetoresistance at one side of the core portion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150052323A KR101741768B1 (en) | 2015-04-14 | 2015-04-14 | Apparatus for Wide Area Wireless Power Transmission and Reception |
| PCT/KR2015/009951 WO2016048008A1 (en) | 2014-09-25 | 2015-09-22 | Wide area omni-directional wireless power transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150052323A KR101741768B1 (en) | 2015-04-14 | 2015-04-14 | Apparatus for Wide Area Wireless Power Transmission and Reception |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20160122881A KR20160122881A (en) | 2016-10-25 |
| KR101741768B1 true KR101741768B1 (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020150052323A KR101741768B1 (en) | 2014-09-25 | 2015-04-14 | Apparatus for Wide Area Wireless Power Transmission and Reception |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110095618A1 (en) * | 2008-09-27 | 2011-04-28 | Schatz David A | Wireless energy transfer using repeater resonators |
| US20140319927A1 (en) * | 2011-09-26 | 2014-10-30 | Korea Advanced Institute Of Science And Technology | Power supply and pickup system capable of maintaining stability of transmission efficiency despite changes in resonant frequency |
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2015
- 2015-04-14 KR KR1020150052323A patent/KR101741768B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110095618A1 (en) * | 2008-09-27 | 2011-04-28 | Schatz David A | Wireless energy transfer using repeater resonators |
| US20140319927A1 (en) * | 2011-09-26 | 2014-10-30 | Korea Advanced Institute Of Science And Technology | Power supply and pickup system capable of maintaining stability of transmission efficiency despite changes in resonant frequency |
Also Published As
| Publication number | Publication date |
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| KR20160122881A (en) | 2016-10-25 |
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