KR20170005589A - Apparatus for transmitting wireless power and system for transmitting wireless power - Google Patents
Apparatus for transmitting wireless power and system for transmitting wireless power Download PDFInfo
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- KR20170005589A KR20170005589A KR1020150095810A KR20150095810A KR20170005589A KR 20170005589 A KR20170005589 A KR 20170005589A KR 1020150095810 A KR1020150095810 A KR 1020150095810A KR 20150095810 A KR20150095810 A KR 20150095810A KR 20170005589 A KR20170005589 A KR 20170005589A
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- wireless power
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- 230000005540 biological transmission Effects 0.000 claims abstract description 234
- 238000000034 method Methods 0.000 claims description 32
- 238000004891 communication Methods 0.000 description 33
- 239000003990 capacitor Substances 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 19
- 230000006698 induction Effects 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 11
- 238000012546 transfer Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000009774 resonance method Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000001646 magnetic resonance method Methods 0.000 description 1
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- H02J17/00—
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- 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—
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A wireless power transmission apparatus according to an embodiment of the present invention is a wireless power transmission apparatus according to an embodiment of the present invention includes a transmission coil unit including a plurality of transmission coils for transmitting AC power to a wireless power reception apparatus, And a transmitting side controller for determining the size of the wireless power receiving device based on the unique information (RXID) received from the receiving device and selecting one of the plurality of transmitting coils according to the size of the wireless power receiving device.
Description
The present invention relates to a wireless power transmission apparatus and a wireless power transmission system.
Recently, as the information and communication technology rapidly develops, a ubiquitous society based on information and communication technology is being made. In order for information communication devices to be connected anytime and anywhere, sensors equipped with a computer chip having a communication function must be installed in all facilities of the society. Therefore, power supply problems of these devices and sensors are becoming a new challenge. In addition, mobile devices such as Bluetooth headsets and iPods, as well as mobile phones, have been rapidly increasing in number, and charging the battery has required users time and effort. As a way to solve this problem, wireless power transmission technology has recently attracted attention.
The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer Thereafter, a method of transmitting electric energy by radiating an electromagnetic wave such as a radio wave or a laser was tried. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.
Until now, energy transmission using radio has been largely divided into a magnetic induction system, a magnetic resonance system, and a power transmission system using a short wavelength radio frequency.
In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, . The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.
The self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents. The self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.
Short wavelength wireless power transmission - simply, the RF method - takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWaves. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.
Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.
In recent years, the development of a transmitter having a combination of a magnetic induction method and a magnetic resonance method has been actively developed. This is because power can be supplied to the receiving unit irrespective of the type of the power supply system of the receiving unit.
Meanwhile, a wireless power transmission apparatus including a plurality of coils is provided according to various kinds of wireless power receiving apparatuses. However, there is a problem that a receiving apparatus requiring less power ruptures by receiving high power.
An object of the present invention is to provide a wireless power transmission apparatus in which a plurality of transmission coils for selectively transmitting power are disposed according to the size of a wireless power receiving apparatus.
The present invention aims to provide a method for the wireless power transmission apparatus to identify a wireless power reception apparatus.
A wireless power transmission apparatus according to an embodiment of the present invention includes a transmission coil unit including a plurality of transmission coils for transmitting AC power to a wireless power reception apparatus, and a transmission coil unit for transmitting, based on the unique information (RXID) received from the wireless power reception apparatus And a transmitting side controller for determining the size of the wireless power receiving device and selecting one of the plurality of transmitting coils according to the size of the wireless power receiving device.
A wireless power transmission system according to an embodiment includes the wireless power transmission apparatus and a wireless power reception apparatus that receives power from the wireless power transmission apparatus.
The present invention has the effect of selectively improving the transmission efficiency by selectively driving the transmission coil according to the size of the wireless power receiving apparatus.
In addition, a transmission coil according to the size of the wireless power receiving apparatus is selected to have a high coupling coefficient, thereby improving the transmission efficiency.
1 is a magnetic induction equivalent circuit.
2 is a self-resonant-type equivalent circuit.
3A and 3B are block diagrams showing a transmitter as one of sub-systems constituting a wireless power transmission system.
4 is a block diagram illustrating a receiving unit as one of the subsystems constituting the wireless power transmission system.
5 is a plan view showing a transmission coil part according to an embodiment of the present invention.
6 is a plan view showing a transmission coil according to another embodiment of the present invention.
7 is a plan view showing a transmitting coil part according to another embodiment of the present invention.
8 is a plan view showing a transmission coil according to another embodiment of the present invention.
9 and 10 are circuit diagrams illustrating a driving unit according to an embodiment of the present invention.
11 is a flowchart illustrating a charging method of a wireless power transmission apparatus according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wireless power transmission system including a wireless power transmission apparatus having a function of wirelessly transmitting power and a wireless power reception apparatus wirelessly receiving power according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.
Embodiments may include a communication system that selectively uses various types of frequency bands from a low frequency (50 kHz) to a high frequency (15 MHz) for wireless power transmission and can exchange data and control signals for system control .
The embodiments can be applied to various industrial fields such as a mobile terminal industry using a battery or an electronic device required, a smart clock industry, a computer and notebook industry, a household appliance industry, an electric car industry, a medical device industry, and a robot industry .
Embodiments may consider a system capable of power transmission to one or more multiple devices using one or more transmission coils.
According to the embodiment, it is possible to solve the battery shortage problem in a mobile device such as a smart phone and a notebook. For example, when a wireless charging pad is placed on a table and a smart phone or a notebook is used on the table, the battery is automatically charged and can be used for a long time . In addition, by installing wireless charging pads in public places such as cafes, airports, taxis, offices, restaurants, etc., mobile devices manufacturers can charge various mobile devices regardless of charging terminals. In addition, when wireless power transmission technology is applied to household electrical appliances such as cleaners, electric fans, etc., there is no need to look for power cables and complex wires can be eliminated in the home, which can reduce wiring in buildings and increase the space utilization. In addition, it takes a lot of time to charge the electric car with the current household power, but if the high power is transmitted through the wireless power transmission technology, the charging time can be reduced. If the wireless charging facility is installed at the bottom of the parking lot, It is possible to solve the inconvenience of having to prepare.
The terms and abbreviations used in the examples are as follows.
Wireless Power Transfer System: A system that provides wireless power transmission within a magnetic field region
Wireless Power Transfer System-Charger: A device that provides wireless power transmission to a power receiver within a magnetic field area and manages the entire system.
Wireless Power Transfer System-Device: A device that is provided with a wireless power transmission from a power transmitter within a magnetic field area.
Charging Area: A region where actual wireless power transmission occurs within the magnetic field region, and may vary depending on the size, required power, and operating frequency of the application product.
Scattering parameter: The S parameter is the ratio of the input port to the output port in terms of the input voltage to the output voltage on the frequency distribution (Transmission S21) or the self reflection value of each input / output port, Reflection (S11, S22) of the reflected output.
Quality factor Q: The value of Q in resonance means the quality of frequency selection. The higher the Q value, the better the resonance characteristics. The Q value is expressed as the ratio of the energy stored in the resonator to the energy lost.
The principles of wireless power transmission include magnetic induction and self-resonance.
The magnetic induction method is a noncontact energy transfer technique in which an electromotive force is generated in the load inductor Ll via a magnetic flux generated when the source inductor Ls and the load inductor Ll are brought close to each other and a current is supplied to one of the source inductors Ls. to be. The self-resonance method combines two resonators to generate self-resonance by the natural frequency between the two resonators. By resonating at the same frequency and using the resonance technique to form an electric field and a magnetic field in the same wavelength range, Technology.
1 is a magnetic induction equivalent circuit.
Referring to FIG. 1, in a magnetic induction equivalent circuit, a wireless power transmission apparatus includes a source voltage Vs, a source resistance Rs, a source capacitor Cs for impedance matching, And the wireless power receiving device may be implemented as a load resistance Rl that is an equivalent resistance of the wireless power receiving device, a load capacitor Cl for impedance matching, And the magnetic coupling between the source coil Ls and the load coil Ll can be expressed by mutual inductance Msl.
In FIG. 1, the ratio S21 of the input voltage to the output voltage is obtained from the magnetic induction equivalent circuit consisting only of the coil without the source capacitor Cs and the load capacitor Cl for impedance matching, The power transmission condition satisfies Equation (1) below.
[Equation 1]
Ls / Rs = L1 / R1
The maximum power transmission is possible when the ratio of the inductance of the transmission coil Ls to the source resistance Rs and the ratio of the inductance of the load coil Ll to the load resistance Rl are equal to each other. Since there is no capacitor capable of compensating for reactance in a system in which there is only an inductance, the value of the self reflection value S11 of the input / output port can not be zero at the point where the maximum power is transmitted, and the mutual inductance Msl, The power transfer efficiency can vary greatly depending on the value. Therefore, the source capacitor Cs can be added to the wireless power transmission apparatus as a compensation capacitor for impedance matching, and the load capacitor Cl can be added to the wireless power reception apparatus. The compensation capacitors Cs and Cl may be connected in series or in parallel to the receiving coil Ls and the load coil Ll, respectively. Further, for the impedance matching, each of the wireless power transmitting apparatus and the wireless power receiving apparatus may be further provided with a passive element such as an additional capacitor and an inductor as well as a compensation capacitor.
2 is a self-resonant-type equivalent circuit.
2, in a self-resonant type equivalent circuit, a radio power transmission apparatus includes a source coil constituting a closed circuit by a series connection of a source voltage Vs, a source resistance Rs and a source inductor Ls, Side resonant coil constituting a closed circuit by a series connection of the side resonant inductor L1 and the transmission side resonant capacitor C1 and the wireless power receiving apparatus is implemented by a load resistor R1 and a load inductor L1, Side resonance coil constituting a closed circuit by a series connection of a load coil constituting a closed circuit by a series connection of the resonance inductor L2 and a resonance inductor L2 on the reception side and a resonance capacitor C2 on the reception side, The load inductor L1 and the load side resonance inductor L2 are magnetically coupled to each other by a coupling coefficient of K23 and the transmission side inductor L1 is magnetically coupled to the transmission side inductor L1 ) And the receiving-side resonance inductor (L2) And is magnetically coupled to the coupling coefficient. In the equivalent circuit of another embodiment, the source coil and / or the load coil may be omitted and only the transmission-side resonance coil and the reception-side resonance coil may be formed.
When the resonance frequencies of the two resonators are the same, most of the energy of the resonator of the wireless power transmission apparatus is transmitted to the resonator of the wireless power receiving apparatus so that the power transmission efficiency can be improved, and the efficiency in the self- It is better when the equation (2) is satisfied.
&Quot; (2) "
k / Γ >> 1 (k is the coupling coefficient, Γ attenuation factor)
In order to increase the efficiency in the self-resonant mode, an element for impedance matching can be added, and the impedance matching element can be a passive element such as an inductor and a capacitor.
Based on such a wireless power transmission principle, a wireless power transmission system for transmitting power by a magnetic induction method or a self resonance method will be described.
<Wireless power transmission device>
FIGS. 3A and 3B are block diagrams illustrating a wireless power transmission apparatus as one of the sub-systems constituting the wireless power transmission system.
Referring to FIG. 3A, a wireless power transmission system according to an embodiment may include a wireless
3B, the wireless
The transmitting side AC /
The transmission side DC /
The transmission-side
The transmitting
The communication and
Also, the overall operation of the wireless
As described above, the transmitting-
<Wireless Power Receiving Device>
4 is a block diagram illustrating a wireless power receiving apparatus as one of the subsystems constituting the wireless power transmission system.
4, a wireless power transmission system may include a wireless
The receiving
The reception side
The receiving-side AC /
The receiving-side DC /
The
The receiving side communication and
The wireless
When the plurality of wireless
Meanwhile, in the case of the wireless power transmission of the magnetic induction type, the transmission side AC /
5 is a plan view showing a transmission coil part according to an embodiment of the present invention.
Referring to FIG. 5, the transmitting
The
The
The center of the
The
That is, when the wireless
6 is a plan view showing a transmission coil according to another embodiment of the present invention.
Referring to FIG. 6, the transmitting
The
The center of the
The
That is, in the wireless
7 is a plan view showing a transmitting coil part according to another embodiment of the present invention.
Referring to FIG. 7, the
The
The center of the
The
That is, in the wireless
Also, in the embodiment, the shielding
8 is a plan view showing a transmission coil according to another embodiment of the present invention.
Referring to FIG. 8, the transmitting
The first transmission coil 110d and the second transmission coil 120d may have an elliptic shape. The width of the first transmission coil 110d may be 54 mm or more and 56 mm or less, the vertical width may be 47 mm or more and 49 mm or less, 2 Transmission coil 120d may have a transverse width of 29 mm or more and 31 mm or less and a transverse width of 19 mm or more and 21 mm or less, but the invention is not limited thereto.
The center of the first transmission coil 110d and the center of the second transmission coil 120d may coincide with each other, but the present invention is not limited thereto.
The first transmission coil 110d and the second transmission coil 120d may have the same charging scheme. According to an embodiment, the first transmission coil 110d and the second transmission coil 120d may have different charging schemes.
That is, when the wireless
In addition, in the embodiment, the shielding
9 and 10 are circuit diagrams illustrating a driving unit according to an embodiment of the present invention.
9, the transmitting side DC /
The reference value may be an average value of the diameters of the plurality of transmission coils, and the reference power may be 5 W, but is not limited thereto.
That is, the inductor L1 may be the
10, the transmitter-side DC /
That is, the inductor L1 may be the
According to the embodiment, when the power is higher than the reference power or the size of the wireless
11 is a flowchart illustrating a charging method of a wireless power transmission apparatus according to an embodiment of the present invention.
Referring to FIG. 11, the wireless
When the wireless
The wireless
The wireless
The wireless
When the power of the wireless
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.
100a, 100b, 100c; Transmitting coil part
110a, 110b, 110c, 110d; The first transmission coil
120a, 120b, 120c, 120d; The second transmission coil
130a, 130b; Shielding portion
Claims (12)
And a transmitting side control unit for determining the size of the wireless power receiving apparatus based on the unique information (RXID) received from the wireless power receiving apparatus and selecting one of the plurality of transmitting coils according to the size of the wireless power receiving apparatus Gt;
Wherein the transmit coils comprise a first transmit coil,
And a second transmission coil disposed inside the first transmission coil,
Wherein when the size of the wireless power receiving apparatus is larger than a reference value, the first transmission coil operates.
Wherein when the size of the wireless power receiving apparatus is smaller than a reference value, the second transmission coil operates.
Further comprising a driver for selectively driving one of a half bridge or a full bridge depending on a size of the wireless power receiving apparatus.
Wherein the transmitting coils have the same charging scheme.
Wherein the transmit coils have a different charging scheme.
The transmitting coils are circular,
The diameter of the first transmission coil is 54 mm or more and 56 mm or less, and the diameter of the second transmission coil is 29 mm or more and 31 mm or less.
The transmitting coils are elliptical,
The first transmission coil has a transverse width of 54 mm or more and 56 mm or less, a longitudinal width of 47 mm or more and 49 mm or less,
Wherein the width of the second transmission coil is 29 mm or more and 31 mm or less and the vertical width is 19 mm or more and 21 mm or less.
Wherein the driving unit drives the half bridge when the size of the wireless power receiving apparatus is smaller than a reference value.
Wherein the driving unit drives the full bridge when the size of the wireless power receiving apparatus is larger than a reference value.
The center of the first transmission coil coincides with the center of the second transmission coil.
And a wireless power receiving device for receiving power from the wireless power transmitting device.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020150095810A KR20170005589A (en) | 2015-07-06 | 2015-07-06 | Apparatus for transmitting wireless power and system for transmitting wireless power |
PCT/KR2016/006912 WO2017007163A1 (en) | 2015-07-06 | 2016-06-28 | Method for operating wireless power transmission device |
US15/742,370 US20180205268A1 (en) | 2015-07-06 | 2016-06-28 | Method for operating wireless power transmission device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150095810A KR20170005589A (en) | 2015-07-06 | 2015-07-06 | Apparatus for transmitting wireless power and system for transmitting wireless power |
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KR20170005589A true KR20170005589A (en) | 2017-01-16 |
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KR1020150095810A KR20170005589A (en) | 2015-07-06 | 2015-07-06 | Apparatus for transmitting wireless power and system for transmitting wireless power |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018194337A1 (en) * | 2017-04-19 | 2018-10-25 | 엘지이노텍(주) | Wireless power transmission apparatus for wireless charging |
KR20210027811A (en) * | 2019-09-03 | 2021-03-11 | 엘지전자 주식회사 | Wireless power transfer apparatus and system including the same |
-
2015
- 2015-07-06 KR KR1020150095810A patent/KR20170005589A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018194337A1 (en) * | 2017-04-19 | 2018-10-25 | 엘지이노텍(주) | Wireless power transmission apparatus for wireless charging |
US11146117B2 (en) | 2017-04-19 | 2021-10-12 | Lg Innotek Co., Ltd. | Wireless power transmission apparatus for wireless charging |
KR20210027811A (en) * | 2019-09-03 | 2021-03-11 | 엘지전자 주식회사 | Wireless power transfer apparatus and system including the same |
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