KR20210011237A - Wireless power transfer apparatus and system including the same - Google Patents

Abstract

The present invention relates to a wireless power transmission apparatus and a system including the same. According to an embodiment of the present invention, the wireless power transmission apparatus includes: a core unit including at least three pairs of a plurality of cores; a plurality of coils wound on the plurality of cores, respectively; and a loop coil surrounding the core unit. Among the plurality of cores, angles between adjacent cores are all the same. Among the plurality of cores, phases of currents flowing in coils wound on two cores forming a core pair, respectively, are the same. Among the plurality of cores, a phase difference between currents flowing in coils wound on two adjacent cores which do not form a core pair, respectively, can correspond to the number of core pairs of the plurality of cores. Therefore, the present invention can provide an environment enabling omnidirectional (6 degrees of freedom) power transmission, which has constant power transmission efficiency regardless of the position and direction of a wireless power reception apparatus.

Description

Wireless power transmission device and wireless power system including the same TECHNICAL FIELD [WIRELESS POWER TRANSFER APPARATUS AND SYSTEM INCLUDING THE SAME}

The present invention relates to a wireless power transmission device and a wireless power system including the same, and more particularly, to a wireless power transmission device capable of omnidirectional power transmission and a wireless power system including the same.

In general, when power is supplied to an electronic device, a terminal supply method of supplying commercial power by connecting a physical cable or wire to the electronic device is used. In such a terminal supply method, cables or wires occupy considerable space, are not easy to arrange, and there is a risk of disconnection.

In recent years, in order to solve this problem, research on a wireless power transmission method has been discussed.

The wireless power transmission system may include a wireless power transmission device that supplies power through a single coil or multiple coils, and a wireless power reception device that receives and uses power wirelessly supplied from the wireless power transmission device.

As a wireless power supply method, an inductive coupling method is mainly used, and this method changes the magnetic field by the current when the intensity of the current flowing through the primary coil among two adjacent coils is changed. , As a result, the magnetic flux passing through the secondary coil is changed, and an induced electromotive force is generated on the secondary coil side. That is, according to this method, when only the current of the primary coil is changed while the two coils are spaced apart without spatially moving the two conductors, induced electromotive force is generated.

On the other hand, in the case of a general wireless power transmission system such as prior art 1 (Korean Patent Laid-Open No. 10-2012-0127991), the generation of induced electromotive force is prevented due to the directivity of power transmission by a magnetic field formed in the primary coil. Since the position and direction of the secondary coil for the purpose is determined in advance, if the secondary coil is not located at the predetermined position and direction, there is a problem in that the efficiency of power transmission is sharply reduced or power transmission is impossible.

The present invention, by forming a magnetic field by a current having a phase difference corresponding to the number of core pairs, each flowing through a plurality of coils wound around a plurality of cores, a wireless power transmission device capable of omnidirectional power transmission and the same It is to provide a system including.

In order to achieve the above object, a wireless power transmission apparatus according to an embodiment of the present invention includes a plurality of cores having the same angle between the cores, three or more pairs, a plurality of coils each wound on a plurality of cores, and a plurality of It may include a loop coil surrounding the core of.

In order to achieve the above object, a wireless power transmission apparatus according to an embodiment of the present invention includes a core unit including a plurality of cores of three or more pairs, a plurality of coils each wound around a plurality of cores in a longitudinal direction, and a core unit. It includes an enclosing loop coil, and among a plurality of cores, the angles between adjacent cores are all the same, and among the plurality of cores, the phases of the current flowing through the coils respectively wound on two cores forming a core pair are the same, and a plurality of Among the cores of, the phase difference of the current flowing through the coils respectively wound around two adjacent cores not forming a core pair may correspond to the number of core pairs of a plurality of cores.

In order to achieve the above object, a wireless power system according to an embodiment of the present invention includes a first core unit having a plurality of first cores of three or more pairs, and a plurality of transmissions each wound around a plurality of first cores in a longitudinal direction. A coil and a loop coil surrounding the first core unit, wherein the angles between adjacent cores among the plurality of first cores are all the same, and among the plurality of first cores, each of the two cores forming a core pair is wound. The phase difference of the current flowing through the transmitting coils having the same phase of the current flowing through the transmitting coils and each of the plurality of first cores being wound around two adjacent cores not forming a core pair is It may include a wireless power transmission device, characterized in that corresponding to the number.

According to various embodiments of the present disclosure, it is possible to provide an environment in which non-directional (6-degree of freedom) power transmission is possible in which power transmission efficiency is constant regardless of the position and direction of the wireless power receiving device.

1 is a block diagram illustrating a wireless power system according to an embodiment of the present invention.
2 is an internal block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.
3 is an internal block diagram of an apparatus for receiving wireless power according to an embodiment of the present invention.
4A and 4B are diagrams for explaining structures of a core unit and a plurality of coils provided in a wireless power transmission apparatus according to an embodiment of the present invention.
5A and 5B are diagrams for explaining the structure of a core unit and a plurality of coils provided in a wireless power transmission apparatus according to another embodiment of the present invention.
6 is a diagram illustrating a wireless power system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts not related to the description is omitted, and the same reference numerals are used for identical or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or additional possibility of additions or numbers, steps, actions, components, parts, or combinations thereof, is not preliminarily excluded.

In addition, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

1 is a block diagram illustrating a wireless power system according to an embodiment of the present invention.

Referring to FIG. 1, the wireless power system 10 may include, for example, a wireless power transmission device 100 for wirelessly transmitting power and a wireless power receiving device 200 for receiving transmitted power. .

The wireless power transmission device 100 is a magnetic induction phenomenon in which a current is induced in the coil 281 provided in the wireless power receiving device 200 according to a change in a magnetic field due to a current flowing through the coil 181 By using, power may be wirelessly transmitted to the wireless power receiving apparatus 200. In this case, the wireless power transmission device 100 and the wireless power receiving device 200 may use, for example, a wireless charging method of an electromagnetic induction method defined by a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA). . Alternatively, the wireless power transmission device 100 and the wireless power reception device 200 may use a magnetic resonance wireless charging method defined in the Alliance for Wireless Power (A4WP), for example.

According to an embodiment, one wireless power transmission device 100 may transmit power to a plurality of wireless power reception devices 200. In this case, the wireless power transmission device 100 may transmit power to the plurality of wireless power reception devices 200 according to, for example, a time division method, but the present invention is not limited thereto, and a plurality of wireless power reception devices (200) Power may be transmitted to the plurality of wireless power receiving apparatuses 200 using different frequency bands allocated to each.

Meanwhile, the number of wireless power receiving devices 200 capable of receiving power from one wireless power transmitting device 100 is, for example, a required amount of power and wireless power transmission of each of the plurality of wireless power receiving devices 200 It may be adaptively determined in consideration of the amount of available power of the device 100.

According to another embodiment, a plurality of wireless power transmission devices 100 may transmit power to at least one wireless power reception device 200. In this case, the at least one wireless power receiving device 200 may be simultaneously connected with the plurality of wireless power transmitting devices 100, for example, and may simultaneously receive power from the connected wireless power transmitting device 100. .

Meanwhile, the number of wireless power transmission devices 100 may be adaptively determined in consideration of, for example, the amount of power required for each of the at least one wireless power receiving device 200 and the amount of available power of the wireless power transmission device 100. I can.

The apparatus 200 for receiving power wirelessly may receive power transmitted from the apparatus 100 for transmitting power wirelessly, for example.

For example, the wireless power receiving apparatus 200 includes wearable devices such as a mobile phone, a laptop computer, and a smart watch, personal digital assistants (PDAs), and portable multimedia players (PMPs). , Navigation, MP3 player, electric toothbrush, lighting device, may be an electronic device such as a remote control, but the present invention is not limited thereto, and any electronic device capable of charging a battery is sufficient.

The wireless power transmission apparatus 100 and the wireless power reception apparatus 200 may communicate with each other, for example. Depending on the embodiment, the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 may perform one-way communication or half-duplex communication.

In this case, the communication method may be an in-band communication method using the same frequency band and/or an out-of-band communication method using different frequency bands.

On the other hand, the data transmitted and received between the wireless power transmission device 100 and the wireless power receiving device 200 is data related to the state of the device, data on power consumption, data on battery charging, the output voltage of the battery, and / Alternatively, it may include data related to the output current and data related to a control command.

2 is an internal block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power transmission device 100 includes, for example, a control unit 160 for controlling each component provided in the wireless power transmission device 100, and a wireless power driver for converting DC power into AC power. 170 and a power transmission unit 180 for wirelessly transmitting power using the converted AC power.

In addition, the wireless power transmission device 100 includes, for example, a converter 110 that converts the commercial AC power source 405 into a DC power source, a memory storing a control program for driving the wireless power transmission device 100, and the like. (120), a sensing unit 130 that senses a current and/or voltage input to a configuration provided in the power transmission unit 180, and/or communicates with the wireless power receiving device 200 according to a predetermined communication method The first and second communication units 140 and 150 may be further included.

The converter 110 may rectify and output the input AC power to DC power, for example. In this case, the AC power may be, for example, a single-phase AC power or a three-phase AC power. For example, each component included in the wireless power transmission apparatus 100 may be operated by DC power output from the converter 110.

In the drawings, the commercial AC power source 405 is shown as a single-phase AC power source, but the present invention is not limited thereto, and may be a three-phase AC power source. Meanwhile, the internal structure of the converter 110 may also vary according to the type of the commercial AC power source 405.

The converter 110 may include, for example, a bridge diode. For example, a pair of upper-arm diode elements and lower-arm diode elements, each connected in series with each other, may be a pair, and a total of two or three pairs of upper-arm diode elements may be connected in parallel with each other. Meanwhile, the converter 110 may further include a plurality of switching elements, for example.

The memory 120 may store various data for the overall operation of the wireless power transmission apparatus 100, such as, for example, a program for processing or controlling the controller 160.

The sensing unit 130 may sense, for example, a current, a voltage, and a temperature of the coil 181 input to the power transmission unit 180. For example, when the power transmission unit 180 includes a coil 181 and a capacitor connected to the coil 181, the sensing unit 130 includes a voltage V1 applied to both ends of the coil and the capacitor. , It is possible to detect all of the voltage V2 applied to both ends of the coil.

The first and second communication units 140 and 150 may communicate with, for example, the wireless power receiving apparatus 200.

The first communication unit 140 may communicate with, for example, a first communication method. The first communication unit 140 may transmit a signal including, for example, data on the state of the device, data on power usage, and the like to the wireless power receiving device 200, and from the wireless power receiving device 200 A signal including data on the state of the device, data on power usage, data on battery charging, and the like may be received.

The second communication unit 150 may communicate with the wireless power receiving apparatus 200 through a second communication method different from the first communication method. The second communication unit 150 may transmit a signal including, for example, data on the state of the device, data on power usage, and the like to the wireless power receiving device 200, and from the wireless power receiving device 200 A signal including data on the state of the device, data on power usage, data on battery charging, and the like may be received.

The first and second communication units 140 and 150 are, for example, for modulating/demodulation of a signal transmitted from the wireless power transmission device 100 and a signal received from the wireless power receiving device 200, It may further include a modem unit (not shown).

The first and second communication units 140 and 150 may further include, for example, a filter unit (not shown) for filtering a signal received from the wireless power receiving apparatus 200. In this case, the filter unit may include, for example, a band pass filter (BPF).

Meanwhile, the first communication method may be, for example, an in-band communication method using the same frequency band as the wireless power receiving apparatus 200. In addition, the second communication method may be, for example, an out-of-band communication method using a frequency band different from that of the wireless power receiving apparatus 200.

Meanwhile, the communication method used in the wireless power transmission apparatus 100 may be changed to at least one of the first and second communication methods, based on, for example, data on the wireless power reception apparatus 200.

The control unit 160 may be connected, for example, to each component provided in the wireless power transmission device 100, and the control unit 160 may include, for example, each component provided in the wireless power transmission device 100 Signals can be transmitted and received with each other, and the overall operation of each component can be controlled.

The controller 160 may communicate with the wireless power receiving apparatus 200 through at least one of the first and second communication units 140 and 150, for example.

The control unit 160 generates a driving signal Sic based on, for example, a PWM generator 160a that generates a signal of a pulse width modulation (PWM) and a PWM signal to generate a wireless power driver. A driver 160b outputting to 170 may be provided.

The wireless power driver 170 may include at least one switching element (not shown) for converting DC power into AC power, for example. For example, when the switching element is the IBGT, the driving signal Sic output from the driver 160b may be input to the gate terminal of the switching element.

Meanwhile, the switching element provided in the wireless power driver 170 may perform a switching operation according to, for example, a driving signal Sic, and DC power is converted into AC power by the switching operation of the switching element. , May be output to the power transmission unit 180.

The wireless power driver 170 may include, for example, an inverter (not shown) including a plurality of switching elements.

The power transmission unit 180 may include, for example, a coil 181. The coil 181 of the power transmission unit 180 may include, for example, a plurality of identical/similar coils (not shown).

The power transmission unit 180 may include, for example, a core (not shown). For example, the core may be disposed to be inserted in the center of the coil 181, and the coil 181 may be wound around the core.

Meanwhile, when the power transmission unit 180 includes a plurality of coils, the power transmission unit 180 may include, for example, a plurality of cores. In this case, each of the plurality of cores may be disposed to be respectively inserted into the centers of the plurality of coils.

The core may increase the magnetic flux density of a magnetic field due to a current flowing through the coil 181 by, for example, reducing magnetic resistance generated in the inner space of the coil 181.

The core may include, for example, a ferrite material, and may include a material such as pure iron, silicon steel, silicon steel-to-iron-aluminum alloy, iron-silicon-aluminum alloy, and iron-nickel alloy.

The core may be configured in a shape having a predetermined width and length, for example. In the present invention, a shape having a square cross section is described as an example, but the present invention is not limited thereto, and may be configured in any shape including a circle.

Meanwhile, the plurality of cores included in the power transmission unit 180 may be configured such that, for example, two cores form a pair (hereinafter, a core pair) with each other. At this time, the plurality of cores may be composed of, for example, three or more core pairs.

Meanwhile, the coils 181 wound on each of the two cores forming the core pair may be wound in parallel with each other, for example.

The plurality of cores may be connected to each other, for example. For example, the plurality of cores may be formed such that one end is connected to each other and the other end extends in a plurality of preset directions, respectively.

A plurality of cores may be located on the same plane, for example. In this case, the two cores forming the core pair may be positioned on the same straight line, for example.

In this case, the plurality of cores may be formed so that the angles between two adjacent cores among the plurality of cores are all the same. In this case, the angle between the two cores may correspond to the number of a plurality of cores, that is, the number of core pairs. For example, the angle between two adjacent cores may correspond to a value obtained by dividing 360° by the number of a plurality of cores, that is, a value obtained by dividing 180° by the number of core pairs.

For example, when there are three core pairs of a plurality of cores, the angle between two adjacent cores may be the same as 60°.

For example, when there are four core pairs of a plurality of cores, the angle between two adjacent cores may be the same as 45°.

Meanwhile, the control unit 160 may control the wireless power driver 170 so that currents of different phases flow through the coils 181 each wound around a plurality of cores, for example. The control unit 160 includes, for example, a plurality of switching elements included in the wireless power driving unit 170 and provided in the inverter so that AC currents of different phases flow through the coils 181 each wound on a plurality of cores. The switching operation of the can be controlled.

For example, the controller 160 may control the wireless power driver 170 so that a current of the same phase flows through the coils 181 each wound around two cores forming a core pair.

On the other hand, for example, the controller 160 may control the wireless power driver 170 so that a current of a different phase flows through the coils 181 each wound around two cores not forming a core pair.

At this time, the phase difference of the current flowing through the coil 181 wound on each of the two cores not forming a core pair may correspond to, for example, the number of cores, that is, the number of core pairs. For example, the phase difference of the current flowing through the coil 181 wound on each of two cores not forming a core pair is a value obtained by dividing 360° by the number of cores, that is, a value obtained by dividing 180° by the number of core pairs. May correspond to.

For example, when there are three core pairs of a plurality of cores, the current flowing through the coils 181 each wound around two adjacent cores not forming a core pair may have a phase difference of 60°.

For example, when there are four core pairs of a plurality of cores, the current flowing through the coils 181 each wound around two adjacent cores not forming a core pair may have a phase difference of 45°.

Meanwhile, the coil 181 of the power transmission unit 180 may further include, for example, a loop coil. The loop coil may be formed of, for example, a conductive member, and may be formed in a shape surrounding a core. For example, the loop coil may be formed in a closed loop shape.

The loop coil may be disposed to surround the core in a direction perpendicular to a direction in which the coil 181 is wound around the core, for example.

The control unit 160 may control the wireless power driver 170 so that an AC current flows through the loop coil, for example.

On the other hand, the coil 181 is spaced apart from the coil 281 provided in the wireless power receiver 200, for example, so that the leakage inductance is high and the coupling factor is low, so the transmission efficiency may be low. have.

In order to solve this problem, the power transmission unit 180 provided in the wireless power transmission apparatus 100 according to various embodiments of the present invention includes, for example, a capacitor element connected to the coil 181 (not shown). It may further include, and a resonant circuit with the coil 281 provided in the wireless power receiving apparatus 200 may be formed.

The capacitor element connected to the coil 181 may be connected in series to the coil 181, for example. Depending on the embodiment, it may be connected in parallel to the coil 181 to form a resonance circuit.

The power transmission unit 180 may determine, for example, a resonant frequency of power transmission.

The power transmission unit 180 may further include, for example, a shielding material (not shown) disposed on one side of the coil 181 to shield a leaking magnetic field.

The controller 160 may transmit and receive signals through, for example, a coil 181 provided in the power transmission unit 180.

The control unit 160 controls each component provided in the wireless power transmission device 100 to output an object detection signal for determining the existence of an object located in the charging area through, for example, the coil 181 can do. The object detection signal may be, for example, a very short pulsed analog ping (AP) signal.

The controller 160 may determine whether an object exists in the charging area based on, for example, a change amount of the current flowing through the coil 181 according to the output of the object detection signal.

The control unit 160, for example, through the coil 181, for activating (awake) the wireless power receiving device 200, each provided in the wireless power transmission device 100 to output a receiving device detection signal You can control the configuration. The reception device detection signal may be, for example, a digital ping (DP) signal.

The digital ping (DP) signal may have a higher duty than the analog ping (AP) signal in order to attempt to establish communication with the wireless power receiving apparatus 200, for example.

Meanwhile, the controller 160 may receive, for example, a response signal to a reception device detection signal output from the wireless power reception device 200 through the coil 181. For example, the wireless power receiver 200 may modulate a digital ping (DP) signal and transmit the modulated digital ping (DP) signal to the wireless power transmission device 100 as a response signal. have.

The control unit 160 may determine whether the object located in the charging area is the wireless power receiving device 200 based on, for example, a response signal to the receiving device detection signal. For example, the controller 160 may obtain digital data by demodulating the modulated digital ping (DP) signal received as a response signal, and based on the acquired data, the charging area It may be determined whether the positioned object is the wireless power receiver 200.

The control unit 160 may calculate, for example, a quality factor (Q) of the coil 181. For example, the controller 160 includes a voltage V1 applied to the coil 181 and a capacitor connected to the coil 181 through the sensing unit 130, and a voltage applied to both ends of the coil 181 (V2) can be detected, and based on this, a quality factor of the coil 181 can be calculated.

Specifically, the controller 160 may calculate a quality factor of the coil 181 according to Equation 1 below, for example.

In the present invention, in order to calculate the quality factor, it is described as detecting the voltage V1 applied to the coil 181 and the capacitor, and the voltage V2 applied to both ends of the coil 181, but the present invention The quality factor may be calculated by detecting the voltage V2 applied to both ends of the coil 181 and the voltage V3 applied to both ends of the capacitor.

The controller 160 may control each component included in the wireless power transmission device 100, for example, and transmit power to the wireless power reception device 200 through the power transmission unit 180.

When the control unit 160 includes, for example, a plurality of coils, the power transmission unit 180 may be referred to as, for example, a coil unit or a coil unit. Meanwhile, the coil 181 provided in the power transmission unit 180 may be referred to as a transmission coil in order to distinguish it from the coil 281 provided in the wireless power receiving apparatus 200, for example.

3 is an internal block diagram of an apparatus for receiving wireless power according to an embodiment of the present invention.

Referring to FIG. 3, the wireless power receiver 200 includes, for example, a power receiver 280 for wirelessly receiving power from the wireless power transmitter 100, a rectifier 210 for rectifying the received power, A switching regulator controller 230 may be included to control the switching regulator 220 and/or the switching regulator 220 to stabilize the rectified power to output operating power to the load.

In addition, the apparatus 200 for receiving power wirelessly may further include a first communication unit 240 and a second communication unit 250 for communicating with the wireless power transmission apparatus 100, for example.

The power receiver 280 may receive, for example, power transmitted from the power transmitter 180. To this end, the power receiving unit 280 may include, for example, at least one coil 281. Hereinafter, the coil 281 provided in the power receiver 280 may be referred to as a receiving coil.

The receiving coil 281 may generate an induced electromotive force by, for example, a magnetic field generated by the coil 181. Electric power by the induced electromotive force may be supplied to the load through, for example, the rectifier 210 and the switching regulator 220. For example, when the load is a battery, electric power by induced electromotive force may be used to charge the battery. In the present invention, it is described that the load supplied with power through the rectifier 210 and the switching regulator 220 is a battery, but the present invention is not limited thereto.

The receiving coil 281 may be formed, for example, on a printed circuit board (PCB) in a thin film form of a conductive pattern. The receiving coil 281 may be printed on a pad (not shown) in a closed loop shape, for example. The polarity of the receiving coil 281 may be, for example, a shape wound so as to have polarity in the same direction.

The power receiver 280 may include, for example, a core (not shown). For example, the core may be disposed to be inserted into the center of the receiving coil 281, and the receiving coil 281 may be wound around the core.

Meanwhile, when the power receiving unit 280 includes a plurality of receiving coils, the power receiving unit 280 may include, for example, a plurality of cores. In this case, each of the plurality of cores may be disposed to be respectively inserted into the centers of the plurality of receiving coils.

Meanwhile, the wireless power receiving apparatus 200 further includes at least one capacitor (not shown) for forming a resonant circuit with the power transmission unit 180 provided in the wireless power transmission apparatus 100, for example. can do. At this time, the capacitor may be connected in series or parallel to the receiving coil 281, for example.

Meanwhile, the wireless power receiving apparatus 200 may further include, for example, a shielding material (not shown) disposed on one side of the receiving coil 281 to shield a leaked magnetic field.

The rectifying unit 210 may rectify power received through the receiving coil 281, for example. The rectifying unit 210 may include at least one diode (not shown).

The switching regulator 220 may supply power rectified by the rectifying unit 210 to the battery under the control of the switching regulator controller 230, for example. For example, the switching regulator 220 may output the power rectified by the rectifier 210 to the charging power v supplied to the battery.

The switching regulator controller 230 may control the charging power v to be output to the battery by outputting the regulator control signal Src to the switching regulator 220, for example.

Meanwhile, the switching regulator 220 may perform DC-DC conversion according to, for example, a regulator control signal Src from the switching regulator controller 230 to adjust an output voltage. The switching regulator 220 may output a charging power source v having a voltage of a predetermined size based on, for example, the regulator control signal Src.

On the other hand, in the wireless power receiving apparatus 200, for example, when a separate processor is not included and the rectified charging power supply v is output with a predetermined voltage by the switching regulator 220, The switching regulator 220 may be controlled by the switching regulator controller 230. When the apparatus 200 for receiving power wirelessly does not include a processor, the hardware configuration is simplified and power consumption is reduced.

4A and 4B are diagrams for explaining structures of a core unit and a plurality of coils provided in a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 4A, the power transmission unit 180 included in the wireless power transmission apparatus 100 includes a core having three core pairs, that is, six cores 411a, 411b, 412a, 412b, 413a, 413b. It may include a unit 400.

One end of the plurality of cores 411a, 411b, 412a, 412b, 413a, 413b may all be connected at the center of the core unit 400, and the other end may be formed to extend in a plurality of directions, respectively. In this case, the plurality of directions in which the other end of the core extends may correspond to the number of the plurality of cores.

Meanwhile, the plurality of cores 411a, 411b, 412a, 412b, 413a, and 413b may be formed separately and connected to each other, or may be continuously formed into one without interruption.

The plurality of cores 411a, 411b, 412a, 412b, 413a, 413b may be positioned on the same plane. At this time, the first and fourth cores 411a and 411b forming a core pair, the second and fifth cores 412a and 412b, and the third and sixth cores 413a and 413b, respectively, are on the same straight line. Can be located in

The plurality of cores 411a, 411b, 412a, 412b, 413a, 413b may be formed so that the angles between two adjacent cores are all the same. When the core unit 400 has three core pairs, the angles between two adjacent cores may be the same as 60°.

A plurality of coils 181a, 181b, 182a, 182b, 183a, 183b may be wound on the plurality of cores 411a, 411b, 412a, 412b, 413a, 413b, respectively.

At this time, the coils 181a & 181b, 182a & 182b, 183a & 183b wound on the two cores 411a & 411b, 412a & 412b, 413a & 413b, respectively, forming a core pair may be wound parallel to each other.

On the other hand, the phases of the currents flowing through the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b, each wound on the plurality of cores 411a, 411b, 412a, 412b, 413a, 413b, may be different from each other. .

Meanwhile, the power transmission unit 180 may include a loop coil 420. The loop coil 420 may be formed in a shape surrounding the core unit 400. For example, the loop coil 420 may be formed in a closed loop shape surrounding all of the plurality of cores 411a, 411b, 412a, 412b, 413a, and 413b.

The loop coil 420 may be located on the same plane as the core unit 400. The loop coil 420 surrounds the plurality of cores 411a, 411b, 412a, 412b, 413a, 413b in a direction perpendicular to the winding direction of the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b. Can be arranged

Referring to FIG. 4B, a first AC current 421 as shown in Equation 2 below may flow through the coils 181a and 181b wound on the first and fourth cores 411a and 411b, respectively, and the second and second The second AC current 422 as shown in Equation 3 below may flow through the coils 182a and 182b wound on the 5 cores 412a and 412b, respectively, and wound on the third and sixth cores 413a and 413b, respectively. A third AC current 423 as shown in Equation 4 below may flow through the coils 183a and 183b.

That is, a current of the same phase may flow through a coil wound around two cores forming a core pair, and a current having a phase difference of 60° may flow through two adjacent coils not forming a core pair.

On the other hand, since the alternating current flowing in each of the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b varies with the passage of time, this causes the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b) The magnetic field formed by the current flowing through it also changes over time.

5A and 5B are diagrams for explaining structures of a core unit and a plurality of coils provided in a wireless power transmission apparatus according to another embodiment of the present invention. Detailed descriptions of contents overlapping with those described in FIGS. 4A to 4C will be omitted.

Referring to FIG. 5A, the power transmission unit 180 included in the wireless power transmission device 100 includes four core pairs, that is, eight cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b). It may include a core unit 500 having.

One end of the plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b may all be connected at the center of the core unit 500, and the other end may be formed to extend in a plurality of directions, respectively. In this case, the plurality of directions in which the other end of the core extends may correspond to the number of the plurality of cores.

The plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b may be formed to have the same angle between two adjacent cores. When there are three core pairs of the core unit 500, the angles between two adjacent cores may be the same as 45°.

In the plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b, a plurality of coils 181a, 181b, 182a, 182b, 183a, 183b, 184a, 184b may be wound, respectively.

At this time, the coils 181a & 181b, 182a & 182b, 183a & 183b, 184a & 184b wound on the two cores 511a & 511b, 512a & 512b, 513a & 513b, 514a & 514b, respectively, forming a core pair may be wound parallel to each other.

Meanwhile, the power transmission unit 180 may include a loop coil 520. The loop coil 520 may be formed in a shape surrounding the core unit 500. For example, the loop coil 520 may be formed in a closed loop shape surrounding all of the plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, and 514b.

The loop coil 520 may be located on the same plane as the core unit 500. The loop coil 520 is a direction perpendicular to the winding direction of the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b, 184a, 184b, and a plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b).

On the other hand, current flowing through a plurality of coils 181a, 181b, 182a, 182b, 183a, 183b, 184a, 184b wound on a plurality of cores 511a, 511b, 512a, 512b, 513a, 513b, 514a, 514b, respectively The phases of may be different from each other.

Referring to FIG. 5B, a first AC current 521 as shown in Equation 2 may flow through the coils 181a and 181b wound on the first and fifth cores 511a and 511b, respectively, and The second AC current 522 as shown in Equation 5 below may flow through the coils 182a and 182b wound on the 6 cores 512a and 512b, respectively, and wound on the third and seventh cores 513a and 513b, respectively. The third alternating current 523 as shown in Equation 6 may flow through the coils 183a and 183b, and the coils 184a and 184b wound on the fourth and eighth cores 514a and 514b, respectively, have the following math A fourth AC current 524 as shown in Equation 7 may flow.

That is, a current of the same phase may flow through a coil wound on each of two cores forming a core pair, and a current having a phase difference of 45° may flow through two adjacent coils not forming a core pair.

On the other hand, since the alternating current flowing through each of the plurality of coils 181a, 181b, 182a, 182b, 183a, 183b, 184a, 184b changes with the passage of time, this causes the plurality of coils 181a, 181b, 182a, 182b, The magnetic field formed by the current flowing through 183a, 183b, 184a, 184b) also changes over time.

6 is a diagram illustrating a wireless power system according to an embodiment of the present invention.

Referring to FIG. 6, the power transmission unit 180 included in the wireless power transmission device 100 is disposed on one side of the core unit 400, for example, a shielding material 190 that shields a leaked magnetic field. It may further include. For example, a plurality of cores 411a, 411b, 412a, 412b, 413a, 413b in which a plurality of coils 181a, 181b, 182a, 182b, 183a, 183b are wound, respectively, are arranged on the upper surface of the shielding material 190 Can be.

Meanwhile, the loop coil 420 may be disposed on the upper surface of the shielding material 180 so as to surround the plurality of cores 411a, 411b, 412a, 412b, 413a, 413b, for example.

The shielding material 190 is, for example, one or a combination of two or more elements selected from the group consisting of cobalt (Co), iron (Fe), nickel (Ni), boron (B), silicon (Si), etc. It may include a ferrite made of.

The area of the shielding material 190 may be formed larger than the area in which the core unit 400 is disposed so that, for example, the leakage magnetic field is reduced and the directionality of the magnetic field is maximized.

On the other hand, the power receiving unit 280 included in the wireless power receiving device 200 is, for example, the same/similar to the power transmission unit 180, a plurality of cores 611a, 611b, 612a, 612b, 613a, 613b ), and a plurality of receiving coils 281a, 281b, 282a, 282b, 283a, 283b respectively wound around the plurality of cores 611a, 611b, 612a, 612b, 613a, 613b.

Meanwhile, a plurality of cores included in the power receiver 280 may be configured such that, for example, two cores form a pair (hereinafter, a core pair) with each other. In this case, the plurality of cores included in the power receiver 280 may be composed of, for example, three or more core pairs.

On the other hand, the power by the induced electromotive force generated by the plurality of receiving coils (281a, 281b, 282a, 282b, 283a, 283b), for example, can be transmitted to each of the rectifier 210 included in the power receiving unit 280 In addition, it may be supplied to the load through the switching regulator 220.

As described above, according to various embodiments of the present invention, a magnetic field is formed so that power transmission efficiency is constant and omni-directional (6-degree of freedom) power transmission is possible regardless of the position and direction of the wireless power receiving device 200 Can be.

The accompanying drawings are only for making it easier to understand the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Claims (10)

A core unit having a plurality of cores of three or more pairs;
A plurality of coils each wound around the plurality of cores in a longitudinal direction; And
Includes a loop coil surrounding the core unit,
Among the plurality of cores, the angles between adjacent cores are all the same,
Of the plurality of cores, the phases of the current flowing through the coils respectively wound on two cores forming a core pair are the same,
A wireless power transmission device, wherein a phase difference of the current flowing through coils each wound around two adjacent cores not forming a core pair, among the plurality of cores, corresponds to the number of core pairs of the plurality of cores. The method of claim 1,
The plurality of cores and the loop coil, wireless power transmission device, characterized in that located on the same plane. The method of claim 2,
Among the plurality of cores, the two cores forming the pair are wireless power transmission device, characterized in that located on the same straight line. The method of claim 3,
The plurality of cores,
One end is connected to each other, and the other end is a wireless power transmission device, characterized in that formed by extending each in a plurality of preset directions. The method of claim 4,
The phase difference is,
A wireless power transmission device, characterized in that it corresponds to a value obtained by dividing the 180 degree phase by the number of core pairs. The method of claim 5,
The angle between the adjacent cores,
Wireless power transmission device, characterized in that the same as the phase difference. The method of claim 6,
The coils wound on each of the two cores forming the pair are wound in parallel with each other. The method of claim 7,
Including a shielding material,
The plurality of cores,
Wireless power transmission device, characterized in that all disposed on the front surface of the shielding material. The method of claim 8,
An inverter having a plurality of switching elements and converting DC power into AC power according to a switching operation of the plurality of switching elements; And
Further comprising a control unit for controlling the operation of the inverter,
The control unit,
The inverter so that an alternating current having the same phase flows through coils wound on each of the two cores forming the core pair, and a current having the phase difference flows through coils wound on each adjacent two cores not forming the core pair. Wireless power transmission device, characterized in that to control the. A first core unit having a plurality of first cores of three or more pairs;
A plurality of transmission coils each wound around the plurality of first cores in a longitudinal direction; And
Includes a loop coil surrounding the core unit,
Of the plurality of first cores, the angles between adjacent cores are all the same,
Among the plurality of first cores, the phases of the current flowing through the transmitting coils respectively wound around two cores forming a core pair are the same,
Among the plurality of first cores, the phase difference of the current flowing through the transmitting coils each wound around two adjacent cores not forming a core pair corresponds to the number of core pairs of the plurality of first cores. Transmission device; And
A wireless power system comprising a wireless power receiving device receiving power from the wireless power transmitting device.

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