KR102087302B1 - Foldable coil apparatus with high efficiency and low electromagnetic field mode - Google Patents

Abstract

Disclosed is a folding coil apparatus. The foldable coil device according to an embodiment of the present invention includes a first coil loop wound in one direction and a first folding part wound in a direction opposite to the one direction and formed between the first coil loop and the first coil loop. A second coil loop connected to the first coil loop, a third coil loop wound in the one direction, and connected to the second coil loop by a second folding part formed between the second coil loop, and the one direction; And a fourth coil loop wound in an opposite direction and connected to the third coil loop by a third folding portion formed between the third coil loop.

Description

Foldable coil device with high efficiency and low electromagnetic interference mode {FOLDABLE COIL APPARATUS WITH HIGH EFFICIENCY AND LOW ELECTROMAGNETIC FIELD MODE}

The present invention relates to wireless power transmission, and more particularly, to a folding coil device capable of realizing high efficiency, low electromagnetic noise and miniaturization according to a folding method.

The wireless power transmission system includes a wireless power transmitter for wirelessly transmitting electrical energy and a wireless power receiver for receiving electrical energy from the wireless power transmitter.

Using a wireless power transfer system, it is possible to charge a battery of a mobile phone, for example, by simply placing the mobile phone on a charging pad without connecting a separate charging connector.

The wireless energy transfer method may be classified into a magnetic induction method, a magnetic resonance method, and an electromagnetic wave method according to a principle of transmitting electrical energy.

Magnetic induction is a method of transmitting electrical energy by using a phenomenon in which electricity is induced between a transmitter coil and a receiver coil.

The magnetic resonance method is a method in which energy is intensively transferred to a receiver coil designed to have the same resonance frequency by generating a magnetic field oscillating at a resonance frequency in a transmitter coil.

The electromagnetic wave or microwave system is a method of receiving electromagnetic waves generated by a transmitter and converting the electromagnetic waves into electrical energy using a single or a plurality of antennas.

On the other hand, the wireless power transfer technology is a flexibly coupled wireless power transfer technology (hereinafter 'flexibly coupled technology') according to the type and strength of the magnetic resonant coupling of the transmitter coil and the receiver coil. And may be classified into a tightly coupled wireless power transfer technology (hereinafter, 'tightly coupled technology').

In this case, in the case of 'flexibly coupled technology', since a magnetic resonance coupling may be formed between one transmitter resonator and a plurality of receiver resonators, simultaneous multiple charging may be possible.

In this case, 'tightly coupled technology' may be a technology capable of only one-to-one power transmission between one transmitter coil and one receiver coil.

Wireless power transfer systems can be applied in complex wireless channel environments such as homes, offices, airports and trains.

In addition, the wireless power transmission system may be applied to an environment for charging a wireless device / IoT device / wearable device by synthesizing a three-dimensional beam pattern of an array antenna based on beacon positioning technology in a three-dimensional space.

Korean Patent Publication No. 10-2017-0125311, "Wireless power transmission apparatus and method thereof" (2017.11.14)

The present invention is to provide a wireless power transmission system that can be applied in a complex wireless channel environment, such as in the home, office, airport, train.

In addition, the present invention is to provide a folding coil device that can implement high efficiency and low electromagnetic noise according to the folding method.

In addition, the present invention is to provide a folding coil device that can be miniaturized according to the folding method.

In addition, the present invention is to provide a folding coil device that can increase the wireless power transmission efficiency and transmission amount according to the folding method.

In addition, the present invention is to provide a folding coil device capable of simultaneously charging a plurality of charging target electronic devices in accordance with the folding method.

In addition, the present invention is to provide a folding coil device that can reduce the leakage electromagnetic waves.

In addition, the present invention is to provide a folding coil device that can be charged in contact with the curved curved surface of the electronic device to be charged.

According to one or more embodiments of the present invention, a foldable coil device includes a first coil loop wound in one direction, a winding wound in a direction opposite to the one direction, and formed between the first coil loop. A second coil loop connected to the first coil loop by a first folding part, and a third coil wound in the one direction and connected to the second coil loop by a second folding part formed between the second coil loop And a fourth coil loop wound in a direction opposite to the one direction and connected to the third coil loop by a third folding part formed between the third coil loop.

In addition, the size of the first coil loop may be smaller than the size of the second coil loop.

In addition, the size of the fourth coil loop may be smaller than the size of the third coil loop.

In addition, the first to fourth coil loops may have a quadrangular shape and may be disposed in parallel with one surface of adjacent coil loops.

In addition, the first to fourth coil loops may be unfolded in one row.

The first coil loop may be folded in the second coil loop direction by the folded first folding part, and the fourth coil loop may be folded in the third coil loop direction by the folded third folding part. have.

In addition, the third and fourth coil loops may be folded in the first and second coil loop directions by the folded second folding parts.

According to another aspect of the present invention, there is provided a foldable coil device including a first coil loop wound in one direction and a folding part wound in a direction opposite to the one direction and formed between the first coil loop and the first coil loop. And a second coil loop connected with the coil loop.

In addition, the first and second coil loops may have a rectangular shape and may be disposed so that one surface thereof is parallel to each other.

In addition, the first and second coil loops may be unfolded in one row.

In addition, the first coil loop may be folded in the second coil loop direction by the folded fold.

According to the present invention, it is possible to provide a highly efficient wireless power transmission system for a three-dimensional selective space in a visible distance and a non-visible distance environment.

According to the present invention, it is possible to provide a foldable coil device capable of realizing high efficiency and low electromagnetic noise according to a folding method.

According to the present invention, it is possible to provide a foldable coil device that can be miniaturized according to the folding method.

According to the present invention, it is possible to provide a foldable coil device that can increase the wireless power transmission efficiency and the transmission amount according to the folding method.

According to the present invention, it is possible to provide a folding coil device capable of simultaneously charging a plurality of charging target electronic devices according to a folding method.

According to the present invention, it is possible to provide a foldable coil device that can reduce leakage electromagnetic waves.

According to the present invention, it is possible to provide a folding coil device that can be charged in contact with the curved surface of the electronic device to be charged.

1 is an exemplary diagram for describing an environment to which a wireless power transmission system is applied.
FIG. 2 is a diagram for describing a wireless power transmitter capable of transmitting power in various ways in the environment as shown in FIG. 1.
3 is a view for explaining an example of the configuration of the wireless charging pad unit in FIG.
4 is a view for explaining an example of the configuration of a wireless charging pad of the wireless charging pad unit according to an embodiment.
FIG. 5 is a diagram for describing an operation example of a wireless charging pad when a charging target device is placed on the wireless charging pad illustrated in FIG. 4.
FIG. 6 is a diagram illustrating an exemplary configuration of the drive control unit and the coil drive unit shown in FIG. 3.
7 is a view illustrating a configuration example of a coil driver and a connection relationship between a small power transmission coil and a coil driver according to an exemplary embodiment.
FIG. 8 is a diagram for describing a configuration example of a near field power transmitter in FIG. 2.
9 is a view for explaining the configuration and operating environment of the microwave power transmitter in FIG.
10 is a block diagram of a folding coil device according to an embodiment of the present invention.
FIG. 11 is a configuration example of the foldable coil device shown in FIG. 10.
FIG. 12 is a diagram for describing a first folding mode of the folding coil device illustrated in FIG. 11.
FIG. 13 is a diagram for describing a second folding mode of the folding coil device illustrated in FIG. 11.
FIG. 14 is a diagram for describing a third folding mode of the folding coil device illustrated in FIG. 11.
15 is a block diagram of a folding coil apparatus 1500 according to another exemplary embodiment.
FIG. 16 is a view for explaining a first folding mode of the folding coil device illustrated in FIG. 15.
FIG. 17 is a view for explaining a second folding mode of the folding coil device illustrated in FIG. 15.

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

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

As used herein, “an embodiment”, “an example”, “side”, “an example”, etc., should be construed that any aspect or design described is better or advantageous than other aspects or designs. It is not.

In addition, the term 'or' means inclusive or 'inclusive or' rather than 'exclusive or'. In other words, unless stated otherwise or unclear from the context, the expression 'x uses a or b' means any one of natural inclusive permutations.

Also, the singular forms “a” or “an”, as used in this specification and in the claims, generally refer to “one or more” unless the context clearly dictates otherwise or in reference to a singular form. Should be interpreted as.

In addition, terms such as first and second used in the present specification and claims may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Unless otherwise defined, all terms used in the present specification (including technical and scientific terms) may be used in a sense that can be commonly understood by those skilled in the art. In addition, terms that are defined in a commonly used dictionary are not ideally or excessively interpreted unless they are specifically defined clearly.

On the other hand, in describing the present invention, when it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express an embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

1 is an exemplary diagram for describing an environment to which a wireless power transmission system is applied.

As shown in FIG. 1, the wireless power transmission environment may be a three-dimensional space such as a living room, a room, an office, an airport, and a train in a home.

Power transmission in the three-dimensional space may use a near field wireless power transform of the magnetic induction or magnetic resonance method. In addition, according to the position or type of the power receiving device, an electromagnetic wave method that can cover a short range and a long distance may be used.

Meanwhile, the power receiver may be a communication device, or an RF harvesting device capable of collecting energy from electromagnetic waves in a three-dimensional space.

FIG. 2 is a diagram for describing a wireless power transmitter capable of transmitting power in various ways in the environment as shown in FIG. 1.

Referring to FIG. 2, the power transmitter may include at least one of the wireless charging pad unit 210, the near field power transmitter 220, and the microwave power transmitter 230.

In other words, although the wireless charging pad unit 210, the near field power transmitter 220, and the microwave power transmitter 230 are all illustrated in FIG. 2, any one power transmission scheme may be used according to a three-dimensional space environment. Only a power transmission device may be provided.

Therefore, in the following description, the wireless power transmitter or the power transmitter should be understood to include at least one of the wireless charging pad unit 210, the near field power transmitter 220, and the microwave power transmitter 230.

The controller 240 may control an operation of at least one of the wireless charging pad unit 210, the near field power transmitter 220, and the microwave power transmitter 230.

The controller 240 may monitor an environment of a three-dimensional space and operate at least one of the wireless charging pad unit 210, the near field power transmitter 220, and the microwave power transmitter 230 based on the monitoring result. Can be controlled.

For example, the controller 240 operates the wireless charging pad unit 210 and the near field power transmitter 220 when the remote transmission is not necessary, and the microwave power transmitter 230 performs a control function so as not to operate. can do.

The wireless charging pad unit 210 may transmit power in a magnetic induction method or a magnetic resonance method.

The near field power transmitter 220 may transmit power in a three-dimensional space in a self-resonant manner.

The microwave power transmitter 230 may transmit power in a three-dimensional space using a microwave power transfer method.

Far field may be defined as a case where a distance between a transmitter and a receiver is greater than or equal to '2x (antenna length) ² / wavelength'.

3 is a view for explaining an example of the configuration of the wireless charging pad unit in FIG.

The device illustrated in FIG. 3 may include a wireless charging pad (not shown) and a wireless charging pad driving device 210. In this case, the wireless charging pad may be configured as shown in FIG. 4.

The wireless charging pad driver includes a driving controller 315 and a coil driver 317. The wireless charging pad driving device may further include a coil determiner 313 and a scanning controller 311.

The wireless charging pad driving apparatus according to an embodiment may include a driving control unit 315 and a driving control unit 315 that independently drive control each of the small power transmission coils of the wireless charging pad including the plurality of small power transmission coils. It may be composed of a plurality of driving modules for driving each of the plurality of small power transmission coils in accordance with the first control signal or the second control signal.

The scanning controller 311 scans the wireless charging pad to detect a device to be charged on the wireless charging pad including a plurality of small power transmission coils.

The scanning controller 311 may detect whether the device to be charged is placed on the small power transmission coil by using at least one of an impedance change and a pressure change of each of the small power transmission coils.

The coil determination unit 313 identifies the driving target power transmission coils positioned below the charging target device among the plurality of small power transmission coils, and surrounds the driving target power transmission coils among the plurality of small power transmission coils. Check the surrounding power transmission coils.

The driving controller 315 generates a first control signal to apply a first driving voltage having a first phase to the driving target power transmission coils, and has a phase different from the first phase to the peripheral power transmission coils. The second control signal may be generated to apply the second driving voltage.

In this case, the driving target power transmission coil may be a small power transmission coil matched to the charging target device. 'Matched to the device to be charged' may mean that the device is located under the device to be charged or in the vicinity of the device to be charged to transmit power to the device to be charged.

In this case, the first control signal controls the coil driver 317 to select the 'A' signal from the signal indicated by 'A' in FIG. 6 and FIG. It may be a 'Select' signal.

Also, the second control signal controls the coil driver 317 to select the 'B' signal among the signal indicated by 'A' in FIG. 6 and FIG. It may be a 'Select' signal.

The coil driver 317 applies the first driving signal and the second driving signal to the wireless charging pad.

4 is a view for explaining an example of the configuration of a wireless charging pad of the wireless charging pad unit according to an embodiment.

Referring to FIG. 4, the plurality of small power transmission coils 410 may be arranged in a tessellation structure, which is a structure that does not overlap on the wireless charging pad.

5 illustrates an example in which a device to be charged, 'DEVICE', is placed on a wireless charging pad.

In this case, only the small power transmission coils inside the hexagonal thick line where the 'DEVICE' is located among the small power transmission coils may be controlled to operate.

FIG. 5 is a diagram for describing an example of an operation of a wireless charging pad when the device to be charged is placed on the wireless charging pad illustrated in FIG. 4.

3 and 5, the scanning controller 311 may detect whether the device to be charged is placed on the corresponding small power transmission coil by using at least one of impedance change and pressure change of each of the small power transmission coils. have.

For example, in the case of scanning by using the impedance change, in the case of the coil in which the charging target device is placed, when the impedance change is out of a preset range, it may be determined that the charging target device is placed on the coil.

In addition, when each small power transmission coil is provided with a pressure sensor, the pressure sensor on which the device to be charged is placed may detect the device through a pressure change.

The scanning control unit 311 may scan the wireless charging pad to detect that the charging target device is positioned on the 10, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 27, 28 coils. Can be.

As a result of scanning by the scanning control unit 311, coils provided under the position where the charging target device is placed are 10, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 27, 28 When detected as coils, the coil determination unit 313 indicates that each of the 10, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 27, and 28 coils is a driving target power transmission coil. You can check it.

In addition, the coil determination unit 313 may include 10, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 27, and 28 coils which are the driving target power transmission coils among the plurality of small power transmission coils. 2, 3, 4, 5, 6, 9, 14, 16, 22, 24, 29, 32, 33, 34, 35, 36 coils surrounding them can be seen that the surrounding power transmission coils.

In the example shown in FIG. 5, the clockwise arrow means the first phase and the counterclockwise arrow means the second phase.

The coil driver 317 may output the first driving signal to the corresponding small power transmission coil when the first control signal is input, and output the second driving signal to the corresponding small power transmission coil when the second control signal is received. have.

For example, the coil driver 317 may apply a first driving signal to each of the 10, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 27, and 28 coils, which are driving target power transmission coils. Output a second drive signal to each of the peripheral power transmission coils 2, 3, 4, 5, 6, 9, 14, 16, 22, 24, 29, 32, 33, 34, 35, and 36 coils. Can be.

As such, the electric power is transmitted to the device to be charged by operating the coils placed in the place where the device to be charged is located, and the coils around the coils where the device to be charged are located to have opposite phases, so that the magnetic force lines directed to the device to be charged are The magnetic force lines that increase and spread out can be reduced.

Therefore, even when the power to be transmitted to the device to be charged is increased, the power transmission efficiency can be maintained and the influence of the magnetic field lines on the outside can be reduced.

FIG. 6 is a diagram illustrating an exemplary configuration of the drive control unit and the coil drive unit shown in FIG. 3.

6 illustrates an example in which one drive control unit (first drive control unit 631) controls four drive modules 642, 643, 645, and 647.

In other words, although not shown in FIG. 9, the driving control unit may include a plurality of second driving control units and third driving control units in addition to the first driving control unit 931.

In this case, the first driving controller 931 may be a shift register having eight output signal terminals 601 to 908.

Therefore, when cascading the first driving control unit 931 such as the shift register, the circuit for individually driving the small power transmission coils may be linearly expanded.

Each of the driving modules 642, 643, 645, and 647 may be connected to a small power transmission coil.

For example, the first driving module 642 is connected to the first small power transmission coil, the second driving module 643 is connected to the second small power transmission coil, and the third driving module 645 is the third The fourth power supply module 647 may be connected to the fourth small power transmission coil.

Therefore, when the 36 small power transmission coils are provided in the wireless charging pad, the wireless charging driving device may include 36 driving modules and 9 driving controllers.

Therefore, the apparatus for driving a wireless charging pad according to an embodiment may include a first driving controller and a plurality of small power transmission units for independently driving and controlling each of the small power transmission coils of the first wireless charging module including the plurality of small power transmission coils. It may include a second driving control unit for independently driving control each of the small power transmission coils of the second wireless charging module composed of a coil.

In this case, one end of the second driving controller may be connected to the first driving controller, and the other end of the second driving controller may be connected to the third driving controller to support expansion of the wireless charging module.

Referring back to FIG. 9, the coil driver includes a plurality of driving modules 642, 643, 645, and 647 connected to each of the plurality of small power transmission coils.

In addition, the coil driver may apply a first switching signal A having a first phase and a second switching signal B having the second phase to each of the plurality of driving modules 642, 643, 645, and 647. It may include two bus lines.

The first driving controller 631 applies an enable signal and a first control signal or a second control signal to control the operation of the corresponding driving module to each driving module.

The first driving controller 631 applies an enable signal to the driving target power transmission coils and the driving modules connected to each of the peripheral power transmission coils, and applies the first control signal or the second control signal. The enable signal may be applied to driving modules to which the enable signal is applied.

For example, when the first driving module 642 is a driving module connected to the driving target power transmission coil, an enable signal may be output to the terminal 601 and a first control signal may be output to the terminal 602. .

For example, when the fourth driving module 647 is a driving module connected to the peripheral power transmission coil, the enable signal may be output to the terminal 607 and the second control signal may be output to the terminal 608.

7 is a diagram illustrating an example of a configuration of a coil driver and a connection relationship between a small power transmission coil and a coil driver according to an exemplary embodiment.

Referring to FIG. 7, reference numeral 710 denotes an equivalent circuit of one small power transmission coil.

One end of the small power transmission coil 710 may be connected to the driving voltage Vcc and the other end may be connected to the switching element 720 provided in the coil driver.

In this case, the coil driver may include a switching device 720, a multiplexer 750, and an and gate device 760 connected to the small power transmission coil 710.

The coil driver may receive the enable signal through the reference numeral 730 and the control signal through the reference numeral 740.

In this case, the multiplexer 750 outputs an A signal, which is a first switching signal, when the control signal input through the 740 terminal is the first control signal, and outputs a second control signal when the control signal input through the 740 terminal is the second control signal. The B signal, which is a switching signal, may be output.

The AND gate element 760 may control the switching element 720 by receiving the enable signal input through the 730 terminal and the output signal of the multiplexer 750.

For example, when the small power transmission coil 710 is a driving target power transmission coil, the first control signal is input to the terminal 740, and the switching element 720 is turned on / off by a switching signal such as an A signal. / Off).

As the driving voltage Vcc is applied to the small power transfer coil 710 according to the on / off of the switching element 720, the small power transfer coil 710 operates with the first driving voltage having the first phase. Done.

For example, when the switching element 720 is an NMOS transistor, the capacitor of the small power transfer coil 710 is charged in the time interval in which the NMOS transistor is on, and the time interval in which the NMOS transistor is off. In the capacitor of the small power transmission coil 710 is discharged, the magnetic field of the inductor can be controlled through the repetition of the charging and discharging.

FIG. 8 is a diagram for describing a configuration example of a near field power transmitter in FIG. 2.

Referring to FIG. 8, the near field power transmitter includes a coil unit 810 including a plurality of power transmission coils, a power divider 815, a first amplifier 820, a second amplifier 830, and a phase shifter ( 840 and the controller 850.

The coil unit 810 transmits wireless power to the receiving coil in a self resonance manner.

For example, the coil unit 810 may include two magnetic resonance coils 811 and 813.

The first self-resonant coil 811 and the second self-resonant coil 813 may respectively transmit power wirelessly by forming a magnetic coupling with a single receiving coil.

As such, an environment composed of a plurality of transmitting coils and a single receiving coil may be referred to as a Multi Input Single Output (MISO) system.

Meanwhile, an environment composed of a single transmitting coil or a single transmitter and a single receiving device may be referred to as a single input single output (SISO) system.

The MISO system may transmit power more efficiently than the SISO system, and may have superior performance compared to the SISO system even in an environment in which the power receiver is moved.

However, in the MISO system, magnetic coupling may be greatly affected by the alignment of the transmitting coil and the receiving coil.

When the phases of the currents supplied to the first self-resonant coil 811 and the second self-resonant coil 813 are controlled differently, magnetic coupling may be formed without being greatly influenced by the alignment state of the transmitting coil and the receiving coil. .

The power divider 815 may distribute the power supplied from the power source and output the distributed power to the first amplifier 820 and the phase shifter 840.

The phase shifter 840 may change the phase of the input power.

The phase shifter 840 may adjust the phase of the current supplied to the second amplifier 830 by adjusting the phase of the input current.

Therefore, the phases of the currents supplied to the first self resonant coil 811 and the second self resonant coil 813 may be adjusted differently.

For example, the phase difference between the currents supplied to the first magnetic resonance coil 811 and the second magnetic resonance coil 813 may be set to 0 to 180 degrees.

This phase control can solve the problem of efficiency degradation caused by the movement of the receiver in the MISO system.

9 is a view for explaining the configuration and operating environment of the microwave power transmitter in FIG.

Referring to FIG. 9, the microwave power transmitter may include an array antenna unit 930 including a plurality of antenna elements element1, element2, and elementN.

The array antenna unit 930 may adjust the radiation characteristics by controlling the magnitude of the phase and the distribution current for each of the plurality of antenna elements.

At this time, by adjusting the feed phase of each radiating element, the electric field is added in phase at the position of the receiving antenna to maximize the received power.

In general, it is assumed that the distance between the array antenna and the receiving antenna is very far. Therefore, the power transmission efficiency between the antennas can be calculated by applying the Friis formula of Equation 1 after assuming that the distance between each antenna element of the array antenna from the receiving antenna is equal.

[Equation 1]

In Equation 1, P _r is the reception power, P _t is the transmission power, R is the distance between the transmitting antenna and the receiving antenna, G _t is the gain of the transmitting antenna, G _r is the gain of the receiving antenna.

However, since the distance between each antenna element of the array antenna and the receiving antenna in the environment for wireless power transmission is different, the general Friis formula cannot be applied.

Therefore, in calculating the power transmission efficiency, the controller 240 or the microwave power transmitter 230 of FIG. 2 calculates the power transmission efficiency in consideration of an environment for actual wireless power transmission.

The controller 240 or the microwave power transmitter 230 of FIG. 2 may receive information on the received power through communication with the power receiver, and calculate the power transmission efficiency based on Equation 2 below.

That is, the magnitude of the input power in each transmitting radiating element is P ₁ , P ₂ ,... , P _N and the distance between the receiving antenna and each radiating element is R ₁ , R ₂ ,. , R _N and each radiating element has the same gain G _t0 , and the power transmission efficiency to the receiving antenna whose antenna gain is G _r can be expressed as in Equation 2.

[Equation 2]

In Equation 2, an average of distances between the radiating element of the transmitting end and the receiving antenna may be defined as in Equation 3, and a power transmission efficiency calculation scheme according to an embodiment may be expressed as in Equation 4.

[Equation 3]

[Equation 4]

Hereinafter, the foldable coil device described with reference to FIGS. 10 to 17 may be another configuration example of the near field power transmitter shown in FIG. 2.

In addition, the foldable coil device described with reference to FIGS. 10 to 17 may be another configuration example of the microwave power transmitter shown in FIG. 2.

In other words, the folding coil device described with reference to FIGS. 10 to 17 may be used for short-range or long-range wireless power transmission.

10 is a block diagram of a folding coil device according to an embodiment of the present invention.

Referring to FIG. 10, the foldable coil device 1000 includes a first coil loop 1010, a second coil loop 1020, a third coil loop 1030, and a fourth coil loop 1040.

The first to fourth coil loops 1010, 1020, 1030, and 1040 may be coils capable of generating a wireless power signal.

The wireless power signal may charge the device to be charged.

The device to be charged may be a variety of devices that receive wireless power, such as notebooks, smartphones, LEDTVs, and vacuum cleaners.

The first coil loop 1010 may be wound in one direction.

The second coil loop 1020 may be wound in a direction opposite to one direction, and may be connected to the first coil loop 1020 by a first folding part 1050 formed between the first coil loop 1010 and the first coil loop 1010.

The third coil loop 1030 may be wound in one direction and may be connected to the second folding part 1060 formed between the second coil loop 1020.

The fourth coil loop 1040 may be wound in a direction opposite to one direction, and may be connected to the third coil loop 1030 by a third folding part 1070 formed between the third coil loop 1030 and the third coil loop 1030.

The size of the first coil loop 1010 may be smaller than the size of the second coil loop 1020.

The size 1040 of the fourth coil loop may be smaller than the size of the third coil loop 1030.

The first to fourth coil loops 1010 to 1040 may have a quadrangular shape and may be disposed in parallel with one surface of adjacent coil loops.

Alternatively, the first to fourth coil loops 1010 to 1040 may have other shapes as well as quadrangular shapes.

The foldable coil device 1000 illustrated in FIG. 10 may further include a power source unit (not shown).

The power source unit may supply a current to the first to fourth coil loops 1010 to 1040.

The first to fourth coil loops 1010 to 1040 may be unfolded in one row.

In the above state, the first coil loop 1010 is folded in the direction of the second coil loop 1020 by the folded first folding portion 1050, and the fourth coil loop 1040 is folded by the folded third folding portion. It may be stacked in the direction of the third coil loop 1030.

In the above state, the third and fourth coil loops 1030 and 1040 may be folded toward the first and second coil loops 1010 and 1020 by the folded second folding portions 1060.

The foldable coil apparatus 1000 shown in FIG. 10 may be configured with four coil loops 1010, 1020, 1030, and 1040, but may be configured with five or more coil loops.

In the foldable coil apparatus 1000 illustrated in FIG. 10, the coil loops 1010, 1020, 1030, and 1040 are arranged in one row, but other shapes may be arranged.

FIG. 11 is a configuration example of the folding coil device shown in FIG. 10.

FIG. 11 (a) shows a top view of the foldable coil device, and FIG. 11 (b) shows a side view of the foldable coil device.

Referring to FIG. 11, the foldable coil device 1110 includes a first coil loop 1120, a second coil loop 1130, a third coil loop 1140, and a fourth coil loop 1150. .

The first coil loop 1120 and the third coil loop 1140 may be coils wound in one direction.

The second coil loop 1130 and the fourth coil loop 1150 may be coils wound in directions opposite to one direction.

The first to third folding parts 1111, 1112, and 1113 may be formed between the coil loops 1120, 1130, 1140, and 1150 so that the coil loops 1120, 1130, 1140, and 1150 may overlap each other. .

The first coil loop 1120 may be connected to the second coil loop 1130 by the first folding part 1111.

The second coil loop 1130 may be connected to the third coil loop 1140 by the second folding part 1112.

The third coil loop 1140 may be connected to the fourth coil loop 1150 by the third folding part 1113.

The first to third folding parts 1111, 1112, and 1113 may be flexible materials.

In addition, the first to fourth coil loops 1120, 1130, 1140, and 1150 may be disposed inside or outside of a flexible material to be stacked or unfolded with each other.

For example, the foldable coil device 1110 may be implemented as a flexible printed circuit board (FPCB).

The user may fold the first to third folding parts 1111, 1112, and 1113 by an external force to overlap the coil loops 1120, 1130, 1140, and 1150.

At this time, the folding direction may be folded in the front direction of the folding coil device 1110 shown in FIG. 11, or may be folded in the rear direction.

The foldable coil device 1110 may maintain a folded state even without an external force of the user.

The user may again unfold the first to third folding parts 1111, 1112, and 1113 by an external force.

The foldable coil device 1110 may maintain the unfolded state even without an external force of the user.

The foldable coil device 1000 illustrated in FIG. 10 may have first to third folding modes.

Hereinafter, the first to third folding modes of the foldable coil device 1000 will be described.

FIG. 12 is a diagram for describing a first folding mode of the folding coil device illustrated in FIG. 11.

FIG. 12 (a) shows a top view of the foldable coil device, and FIG. 12 (b) shows a side view of the foldable coil device.

Referring to FIG. 12, the foldable coil device 1210 may have a state in which all of the first to fourth coil loops 1220, 1230, 1240, and 1250 are unfolded.

In this case, the first coil loop 1220 may be wound in one direction 1221.

One direction 1221 may be clockwise.

The second coil loop 1230 may be wound in a direction 1231 opposite to one direction.

The opposite direction 1231 may be a counterclockwise direction.

The third coil loop 1240 may be wound in one direction 1241.

One direction 1241 may be clockwise.

The fourth coil loop 1250 may be wound in a direction 1251 opposite to one direction.

The opposite direction 1251 may be a counterclockwise direction.

The second coil loop 1230 may be a coil loop having the same size as the third coil loop 1240.

The first coil loop 1220 may be a coil loop having the same size as the fourth coil loop 1250.

The size of the first coil loop 1220 and the fourth coil loop 1250 may be half the size of the second coil loop 1230 and the third coil loop 1240.

The first coil loop 1220 may form a low electromagnetic field (EMF) by canceling the magnetic field with a current in a direction opposite to the second coil loop 1230.

The fourth coil loop 1250 may form a low electromagnetic field (EMF) by canceling the magnetic field with a current opposite to the third coil loop 1240.

Accordingly, the foldable coil device 1210 may affect a peripheral device and reduce a leakage magnetic flux that may be harmful to a human body.

In addition, the foldable coil device 1210 may form a wide wireless charging space by the first folding mode.

FIG. 13 is a diagram for describing a second folding mode of the folding coil device illustrated in FIG. 11.

FIG. 13 (a) shows a top view of the foldable coil device, and FIG. 13 (b) shows a side view of the foldable coil device.

Referring to FIG. 13, in the folding coil apparatus 1310, the first coil loop 1320 is stacked in the direction of the second coil loop 1330 in the first folding mode illustrated in FIG. 12, and the fourth coil loop ( 1350 may have a state in which it is stacked in the direction of the third coil loop 1340.

The first fold portion 1311 and the third fold portion 1313 may be folded.

The folded directions of the first fold portion 1311 and the third fold portion 1313 may be folded toward the front of the foldable coil device 1310 shown in FIG. 13.

The second fold 1312 may be straight.

The first coil loop 1320 may be wound in one direction 1321.

One direction 1321 may be clockwise.

The second coil loop 1330 may be wound in a direction 1331 opposite to one direction.

The opposite direction 1331 may be a counterclockwise direction.

Therefore, when the first coil loop 1320 is stacked with the second coil loop 1330, the first to second coil loops 1320 and 1330 may have the same current direction.

In other words, the first to second coil loops 1320 and 1330 may have the same counterclockwise current.

The third coil loop 1340 may be wound in one direction 1341.

One direction 1341 may be clockwise.

The fourth coil loop 1350 may be wound in a direction 1351 opposite to one direction.

The opposite direction 1351 may be a counterclockwise direction.

Therefore, when the fourth coil loop 1350 is stacked with the third coil loop 1340, the third to fourth coil loops 1340 and 1350 may have the same current direction.

In other words, the third to fourth coil loops 1340 and 1350 may have the same clockwise current.

Therefore, the folding coil device 1310 may increase the wireless charging efficiency and the wireless power transmission amount by increasing the magnetic field by the second folding mode.

FIG. 14 is a diagram for describing a third folding mode of the folding coil device illustrated in FIG. 11.

FIG. 14 (a) shows a top view of the foldable coil device, and FIG. 14 (b) shows a side view of the foldable coil device.

Referring to FIG. 14, in the second folding mode illustrated in FIG. 13, the foldable coil device 1410 may include the first coil loop 1420 and the second coil loop 1430 superimposed on the third coil loop. 1440 and the third coil loop 1450 may be overlapped again.

The first fold portion 1411 and the third fold portion 1413 may be kept folded forward.

The second fold 1312 can be folded back.

Thus, the first to fourth coil loops 1410, 1420, 1430, and 1440 may be completely stacked.

In this case, the first coil loop 1420 may be wound in one direction 1421.

One direction 1421 may be clockwise.

The second coil loop 1430 may be wound in a direction 1431 opposite to one direction.

The opposite direction 1431 may be a counterclockwise direction.

The third coil loop 1440 may be wound in one direction 1441.

One direction 1441 may be clockwise.

The fourth coil loop 1450 may be wound in a direction 1451 opposite to one direction.

One direction and the opposite direction (1451) may be counterclockwise.

Therefore, when stacked as in the third folding mode, all of the first to fourth coil loops 1420 to 1450 may have the same current direction.

In other words, the first to fourth coil loops 1420 to 1450 may have a current in a mode counterclockwise direction.

Accordingly, the foldable coil device 1310 may increase the magnetic field to the maximum by the third folding mode to increase the wireless charging efficiency and the wireless power transmission amount.

In addition, the folding coil device 1410 can be downsized by the third folding mode, and thus can be easily used.

15 is a block diagram of a folding coil apparatus 1500 according to another exemplary embodiment.

Referring to FIG. 15, the foldable coil device 1500 includes a first coil loop 1510 and a second coil loop 1520.

The first to second coil loops 1510 and 1520 may be coils capable of generating a wireless power signal.

The wireless power signal may charge the device to be charged.

The device to be charged may be a variety of devices that receive wireless power, such as notebooks, smartphones, LEDTVs, and vacuum cleaners.

The first coil loop 1510 may be wound in one direction.

The second coil loop 1520 may be wound in a direction opposite to one direction, and may be connected to the first coil loop 1510 by a folding part 1530 formed between the first coil loop 1510 and the first coil loop 1510.

The first and second coil loops 1510 and 1520 may have a quadrangular shape and may be disposed so that one surface thereof is parallel to each other.

The first coil loop 1510 may be connected to the second coil loop 1520 by the folding part 1530.

Foldable portion 1530 may be a flexible material.

In addition, the first to second coil loops 1510 and 1520 may be disposed inside or outside the flexible material to be stacked or unfolded with each other.

For example, the foldable coil device 1510 may be implemented as a flexible printed circuit board (FPCB).

The foldable coil device 1500 illustrated in FIG. 15 may further include a power source unit (not shown).

The power source unit may supply a current to the first to second coil loops 1510 to 1520.

The first and second coil loops 1510 and 1520 may be unfolded in one row.

The first coil loop 1510 may be folded toward the second coil loop 1520 by the folded foldable part 1530.

The folding part 1530 may be formed between the coil loops 1510 and 1520 such that the coil loops 1510 and 1520 overlap each other.

The user may fold the folding unit 1530 by an external force so that the coil loops 1510 and 1520 may overlap.

At this time, the folding direction may be folded in the front direction of the folding coil device 1110 shown in FIG. 15, or may be folded in the rear direction.

The foldable coil device 1500 may maintain a folded state even without an external force of a user.

The user may again unfold the folding unit 1530 by an external force.

The foldable coil device 1500 may maintain an unfolded state even without an external force of the user.

The foldable coil device 1500 illustrated in FIG. 15 may have first to second folding modes.

Hereinafter, the first to second folding modes of the folding coil device 1500 will be described.

FIG. 16 is a view for explaining a first folding mode of the folding coil device illustrated in FIG. 15.

FIG. 16 (a) shows a top view of the foldable coil device, and FIG. 16 (b) shows a side view of the foldable coil device.

Referring to FIG. 16, the foldable coil device 1610 may have a state in which all of the first to second coil loops 1620 and 1630 are unfolded.

Foldable portion 1611 may be in an open state.

In this case, the first coil loop 1620 may be wound in one direction 1621.

One direction 1621 may be counterclockwise.

The second coil loop 1630 may be wound in a direction 1631 opposite to one direction.

The opposite direction 1231 may be clockwise.

The first coil loop 1620 and the second coil loop 1630 may have the same size.

Accordingly, the foldable coil device 1210 may form a wide wireless charging space by the first folding mode.

FIG. 17 is a view for explaining a second folding mode of the folding coil device illustrated in FIG. 15.

17 shows a side view of the folding coil apparatus.

16 and 17, the foldable coil device 1710 may have a state in which the second coil loop 1730 is stacked in the direction of the first coil loop 1720 in the first folding mode state illustrated in FIG. 16. Can be.

Foldable portion 1711 can be folded toward the front of foldable coil arrangement 1710.

In this case, the first coil loop 1720 may be wound in one direction 1621.

One direction 1621 may be counterclockwise.

The second coil loop 1730 may be wound in a direction 1631 opposite to one direction.

One direction and the opposite direction (1631) may be clockwise.

Therefore, when the first coil loop 7320 and the second coil loop 1730 are stacked, the first to second coil loops 1720 and 1730 may have the same current direction.

In other words, the first to second coil loops 1720 and 1730 may have the same counterclockwise current.

Therefore, the folding coil device 1710 may increase the wireless charging efficiency and the wireless power transmission amount by increasing the magnetic field by the second folding mode.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the devices and components described in the embodiments may include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of the software. For the convenience of understanding, the processing apparatus may be described as one used, but those skilled in the art will appreciate that the processing apparatus includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as parallel processors.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and may configure the processing device to operate as desired, or process independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be embodied permanently or temporarily in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even by substitution or replacement by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (11)

A first coil loop wound in one direction;
A second coil loop wound in a direction opposite to the one direction and connected to the first coil loop by a first folding part formed between the first coil loop;
A third coil loop wound in the one direction and connected to the second coil loop by a second folding part formed between the second coil loop; And
A fourth coil loop wound in a direction opposite to the one direction and connected to the third coil loop by a third folding part formed between the third coil loop and the third coil loop.
Foldable coil device. The method of claim 1,
The coil size of the first coil loop is smaller than the size of the second coil loop. The method of claim 1,
The size of the fourth coil loop is smaller than the size of the third coil loop. The method of claim 1,
The first to fourth coil loops have a quadrangular shape and are disposed in parallel with one surface of adjacent coil loops.
Foldable coil device. The method of claim 1,
The first to fourth coil loops are unfolded in a row. The method of claim 1,
The first coil loop is folded in the second coil loop direction by the folded first first folding part, and the fourth coil loop is folded in the third coil loop direction by the folded third folding part.
Foldable coil device. The method of claim 5,
The third and fourth coil loops are superposed in the first and second coil loop directions by the folded second folds.
Foldable coil device. delete delete delete delete

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