WO2020096342A1 - Wireless charging pad and wireless charging device - Google Patents

Wireless charging pad and wireless charging device Download PDF

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Publication number
WO2020096342A1
WO2020096342A1 PCT/KR2019/014963 KR2019014963W WO2020096342A1 WO 2020096342 A1 WO2020096342 A1 WO 2020096342A1 KR 2019014963 W KR2019014963 W KR 2019014963W WO 2020096342 A1 WO2020096342 A1 WO 2020096342A1
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WO
WIPO (PCT)
Prior art keywords
wireless charging
magnetic body
charging pad
magnetic
coil
Prior art date
Application number
PCT/KR2019/014963
Other languages
French (fr)
Korean (ko)
Inventor
신용환
이병혁
백종석
조용남
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Publication of WO2020096342A1 publication Critical patent/WO2020096342A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

Definitions

  • the present invention relates to a wireless charging pad and a wireless charging device.
  • Such a wireless charging system includes several electronic components, including a wireless charging pad and a resonant tank for impedance compensation.
  • the resonant tank is manufactured to be located outside the wireless charging pad.
  • the resonant inductor change the characteristics of the resonant inductor change.
  • Patent Publication No. 10-2007-0050907 (hereinafter referred to as Prior Art Document 1) relates to the integration of a planar transformer or a planar inductor of a power converter, and the planar inductor is composed of a multi-layer substrate composed of electrically insulating and thermally conductive layers.
  • Each layer of Prior Art Document 1 is an electrical layer for forming a planar inductor, one of which is composed of a substrate thermally coupled to a heat sink.
  • the winding is limited to the PCB substrate, and the problem of increasing the volume by using a proprietary magnetic material for the lower ferrite may be generated.
  • Patent Publication No. 10-2013-0143079 (hereinafter referred to as the prior art document 2) is a patent for a thin film type inductor capable of storing large energy per unit area, and a first ferromagnetic yoke (consisting of a magnetic upper section and the following magnetic section) partially surrounding a conductor is Consists of a magnetic top section, a magnetic bottom section, each section is coupled to each other via a low magnetic resistance path in the via region, and includes one or more non-magnetic gaps between the top section and the bottom section.
  • Prior Document 2 proposes an inductor having a thin film-like arm surrounding a conductor, and an arm for reducing magnetic resistance is installed in a path through which magnetic flux around the conductor flows.
  • Prior document 2 forms an inductance with an air core.
  • the structure as in the prior document 2 is difficult to manufacture with a material such as ferrite, and has a limitation in having a high inductance.
  • the wireless charging pad includes a planar inductor in which an inductor coil is disposed between an inner core and an outer core.
  • the planar inductor includes an inner core forming a magnetically closed loop, an outer core surrounding at least a portion of the inner core, and an inductor coil at least partially positioned between the inner core and the outer core. Specific details of other embodiments are included in the detailed description and drawings.
  • the flux-cancellation reduces the magnetic flux value of the magnetic material of the wireless charging pad, thereby reducing the thickness of the magnetic material and reducing the cost.
  • FIG. 1 is a view showing the appearance of a wireless charging system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of a wireless charging system according to an embodiment of the present invention.
  • FIG. 3 is a view referred to for describing a wireless charging method according to an embodiment of the present invention.
  • FIG. 4 illustrates an equivalent circuit of a wireless charging pad according to an embodiment of the present invention.
  • FIG 5 is a view referred to for explaining the configuration of a wireless charging pad according to an embodiment of the present invention.
  • FIG. 6 is a plan view of a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • FIG. 7 is a side view of a planner inductor according to an embodiment of the present invention.
  • FIG. 8 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • FIG. 9 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
  • FIG. 10 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
  • FIG. 11 is a view of a wireless charging pad in which a planar inductor is omitted, viewed from a specific direction.
  • FIG. 12 is a side view of a wireless charging pad with a planar inductor omitted.
  • FIG. 13 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • FIG. 14 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
  • FIG. 1 is a view showing the appearance of a wireless charging system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of a wireless charging system according to an embodiment of the present invention.
  • the wireless charging system 100 may include a power transmitting device 10 and a power receiving device 20.
  • the wireless charging system 100 may be used for wireless charging of an electric vehicle battery, wireless charging of a robot cleaner, wireless charging of a mobile terminal battery, and the like.
  • the power transmission device 10 When the wireless charging system 100 is used for wireless charging of an electric vehicle battery, the power transmission device 10 may be installed in a charging station or the like, and the power receiving device 20 may be provided inside the vehicle. When the wireless charging system 100 is used for wireless charging of the robot cleaner battery, the power transmission device 10 may be configured in a portable format, and the power receiving device 20 may be provided inside the robot cleaner. . When the wireless charging system 100 is used for wireless charging of the mobile terminal battery, the power transmission device 10 may be configured in a portable format, and the power reception device 20 may be provided inside the mobile terminal. .
  • the power transmission device 10 may include an AC / DC converter 11, a DA / AC inverter 12, a resonance tank 13 and a transmission pad 14.
  • the AC / DC converter 11 may convert electrical energy in the form of AC provided from the system 1 into a form of DC.
  • the DC / AC converter 12 converts electrical energy in the form of direct current into electrical energy in the form of alternating current. At this time, the DC / AC converter 12 may generate high-frequency signals of tens to hundreds of kHz.
  • the resonance tank 13 compensates for impedance suitable for wireless charging.
  • the transmission pad 14 transmits electric energy wirelessly.
  • the transmission pad 14 includes a transmission coil 15 therein.
  • the power receiving device 20 may include a receiving pad 21, a resonance tank 22, and a rectifier 23.
  • the receiving pad 21 wirelessly receives electrical energy.
  • the receiving pad 21 includes a receiving coil 25 therein.
  • the transmitting pad 14 and the receiving pad 21 include a coil set (transmitting coil 15 and receiving coil 25) having magnetic coupling.
  • the transmitting pad 14 and the receiving pad 21 transmit electric energy without physical contact between physical electrodes through a magnetic field generated by a high frequency driving signal.
  • the resonance tank 22 compensates for impedance suitable for wireless charging.
  • the rectifier 21 converts the electrical energy in the AC form to the electrical energy in the DC form in order to supply the DC 30 with electrical energy.
  • the battery 30 may be provided in a vehicle, a robot cleaner, or a mobile terminal.
  • FIG. 3 is a view referred to for describing a wireless charging method according to an embodiment of the present invention.
  • the wireless charging system may use an inductive coupling method or a resonance coupling method.
  • inductive Coupling Inductive Coupling, if the intensity of the current flowing through the primary coil (coil) of the two adjacent coils (coil) changes the magnetic field by the current, thereby passing through the secondary coil (coil)
  • the principle is that the magnetic flux changes and the induced electromotive force is generated on the secondary coil side. That is, according to this method, induction electromotive force is generated when only the current of the primary coil is changed while the two coils are brought into proximity without spatially moving the two conductors.
  • the frequency characteristic is not greatly affected, but the alignment and distance between the transmitting device (e.g., wireless charging device) and the receiving device (e.g., mobile terminal) including each coil. According to (Distance), power efficiency is affected.
  • a part of the amount of magnetic field variation generated by applying a resonance frequency to a primary coil among two coils separated by a certain distance is a secondary coil having the same resonance frequency ( coil) to use the principle that induced electromotive force is generated in the secondary coil. That is, according to this method, when the transmitting and receiving devices each resonate at the same frequency, since electromagnetic waves are transmitted through a short-range electromagnetic field, energy transmission is not performed at different frequencies. In this case, the choice of frequency can be an important issue. Since there is no energy transfer between the resonant frequencies spaced apart by a predetermined distance or more, the device to be charged may be selected through the selection of the resonant frequency. If only one device is allocated to one resonance frequency, the selection of the resonance frequency may have a meaning of selecting a device to be charged soon.
  • the resonant coupling method has an advantage in that alignment and distance between a transmitting device and a receiving device including each coil have less influence on power efficiency, compared to an inductive coupling method.
  • FIG. 4 illustrates an equivalent circuit of a wireless charging pad according to an embodiment of the present invention.
  • the wireless charging pad 500 may be used as the transmission pad 14 of the power transmission device 10 or the reception pad 21 of the power reception device 20.
  • the wireless charging pad 500 may be used for wireless charging of a small device such as a mobile terminal, but is preferably used for wireless charging of a large device such as an electric vehicle.
  • the wireless charging pad 500 may be used as a pad 500a for power transmission or a pad 500b for power reception.
  • the power transmission pad 500a may include a resonance tank 13 and a power transmission coil 520a.
  • the power transmission pad 500a may be electrically connected to the power converters 11 and 12.
  • the power converters 11 and 12 may include an AC / DC converter 11 and a DC / AC inverter 12 described with reference to FIG. 2.
  • the power receiving pad 500b may include a resonance tank 22 and a power receiving coil 520b.
  • the power receiving pad 500b may be electrically connected to the rectifier 23.
  • 5 is a view referred to for explaining the configuration of a wireless charging pad according to an embodiment of the present invention.
  • 5 illustrates an exploded perspective view of the wireless charging pad.
  • 5 illustrates the receiving pad 21 by way of example.
  • the transmission pad 14 is based on the ground, only the stacking order of the reception pad 21 is reversed, and the description of FIG. 5 may be applied.
  • the wireless charging pad 500 includes a first case 610, a winding guide 620, at least one transmission / reception coil 520, a first magnetic body 510, an aluminum plate 630, insulation A sheet 640 and a second case 650 may be included.
  • the first case 610 may form an external appearance of the wireless charging pad 500 together with the second case 650.
  • the first case 610 may be combined with the second case 650 to form a space therein.
  • the winding guide 620, the transmission / reception coil 520, the ferrite plate 510, the aluminum plate 630, and the insulating sheet 640 may be accommodated.
  • the winding guide 620, the winding guide 620 may be located inside the transmission / reception coil 520.
  • the winding guide 620 when coupled, can be fixed to the transmitting and receiving coil 520 so that it is fixed and does not move.
  • the winding guide 620 may be formed integrally with the first case 610.
  • the winding guide 620 may be omitted.
  • the transmitting / receiving coil 520 is formed in a spiral shape, so that the overall shape may form a circular, elliptical, or polygonal shape.
  • the winding guide 620 may have a circular, elliptical or polygonal shape so that the transmission / reception coil 520 can be wound in a circular, elliptical or polygonal shape.
  • the transmission / reception coil 520 may be a coil for power transmission.
  • the transmission / reception coil 520 may transmit or receive power wirelessly.
  • the transmission / reception coil 520 may be described as the transmission coil 15.
  • the transmitting / receiving coil 520 may be described as the receiving coil 25.
  • the transmission / reception coil 520 may be formed in a spiral shape. Due to the winding of the transmitting / receiving coil 520, the transmitting / receiving coil 520 may have an overall circular, elliptical, or polygonal appearance.
  • the transmission / reception coil 520 may include an inlet portion and an outlet portion.
  • the first magnetic body 510 may have a circular, elliptical, or polygonal shape.
  • the first magnetic body 510 may be formed of at least one plate. It is preferable to use ferrite as the first magnetic body 510.
  • the first magnetic body 510 may be disposed while being layered with the transmission / reception coil 520.
  • the first magnetic body 510 may be disposed above or below the transmission / reception coil 520.
  • the first magnetic body 510 may be disposed inside the transmission / reception coil 520.
  • the transmitting and receiving coil 520 may be wound around the first magnetic body 510.
  • the insulating sheet 640 can shield unintended currents.
  • the insulating sheet 640 may shield the surface current flowing through the first magnetic body 510.
  • the insulating sheet 640 may shield the capacitor of the resonant tank 530 from being energized with other components in the wireless charging pad 500.
  • the insulating sheet 640 may be positioned between the aluminum plate 630 and the first magnetic body 510.
  • the insulating sheet 640 may be formed of various insulating materials, but is preferably formed of polycarbonate (PC).
  • the aluminum plate 630 can shield the magnetic field.
  • the aluminum plate 630 may shield the magnetic field generated in the process of power transmission and / or power reception from leaking to the outside.
  • the aluminum plate 630 may perform a heat dissipation function.
  • the aluminum plate 630 may induce heat generated from the transmission / reception coil 520 and / or the first magnetic body 510 in the process of power transmission and / or power reception to the outside of the wireless charging pad 500.
  • the aluminum plate 630 may be positioned between the first magnetic body 510 and the second case 650.
  • the aluminum plate 630 may be positioned under the first magnetic body 510.
  • the second case 650 may form an external appearance of the first case 610 and the wireless charging pad 500.
  • the second case 650 may be combined with the first case 610 to form a space therein.
  • FIG. 6 is a plan view of a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • 7 is a side view of a planner inductor according to an embodiment of the present invention.
  • the wireless charging pad 500 includes a first magnetic material 510 and a planar inductor (planar) arranged around the transmitting and receiving coil 520, the transmitting and receiving coil 520 to transmit or receive power wirelessly by magnetic coupling (Magnetic coupling) inductor) 700.
  • the planar inductor 700 may be classified into sub-constructions of the resonant tanks 13 and 22 described above.
  • the resonant tanks 13 and 22 include a capacitor and an inductor, and the planar inductor 700 may function as an inductor of the resonant tanks 13 and 22.
  • the inductors of the resonant tanks 13 and 22 are necessary for energy storage.
  • FIG. 6 may be a plan view of the planar inductor from below.
  • FIG. 6 may be a plan view of the planar inductor.
  • the planar inductor 700 may have a flat shape.
  • the planar inductor 700 may be disposed while being layered with the first magnetic body 510.
  • the planar inductor 700 may include an inner core 710, an outer core 720, and an inductor coil 705.
  • the inner core 710 may be formed of a magnetic material.
  • the inner core 710 is preferably formed of ferrite.
  • the inner core 710 may form a closed loop with a ruler.
  • the inner core 710 may be located inside the inductor coil 705.
  • the inner core 710 may have a ring-shaped cross section. In this case, the inner core 710 may be referred to as a ring core.
  • the inner core 710 may be a square core or an E core.
  • the outer core 720 may be formed of a magnetic material.
  • the outer core 720 is preferably formed of ferrite.
  • the outer core 720 may surround at least a portion of the inner core 710.
  • the outer core 720 may be located outside the inductor coil 705.
  • the outer core 720 may have a ring-shaped cross section partially open.
  • the outer core 720 may be a square core or an E core. Meanwhile, an inlet portion and an outlet portion of the inductor coil 705 may be located in the open portion of the outer core 720.
  • the inductor coil 705 may be located at least partially between the inner core 710 and the outer core 720.
  • the winding portion of the inductor coil 705 may be positioned between the inner core 710 and the outer core 720.
  • the winding portion of the inductor coil 705 may be located between the inner core 710 and the outer core 720.
  • the inductor coil 705 may be wound in one direction along the circumference of the outer surface of the inner core 710.
  • At least a portion (eg, an upper surface or a lower surface) of the outer core 720 contacts the first magnetic body 510, and at least a portion of the inner core 710 is a first magnetic body Spaced apart from 510, an air gap 740 may be formed.
  • at least a portion (eg, an upper surface or a lower surface) of the inner core 710 contacts the first magnetic body 510, and at least a portion of the outer core 720 is spaced apart from the first magnetic body 510 Voids can form.
  • the inductance of the planar inductor 700 is correlated with the air gap 740 formed by the inner core 710 being spaced apart from the first magnetic body 510 or the air gap formed by the outer core 720 being spaced apart from the first magnetic body 510.
  • the inductance of the planar inductor 700 may be inversely proportional to the size of the void 740.
  • the inductance of the planar inductor 700 can be inversely proportional to the height of the void 740.
  • the height of the air gap may be defined as a length in the vertical direction.
  • the wireless charging pad 700 may further include a second magnetic body 770.
  • the second magnetic body 770 may contact the inner core 710.
  • the second magnetic body 770 may contact the outer core 720.
  • the inductor planner 700 may be positioned between the first magnetic body 510 and the second magnetic body 770.
  • the planar inductor 700 may form a magnetic closed loop through the inner core 710 and the outer core 720.
  • the first magnetic body 510, the void 740, the inner core 710, the second magnetic body 770, and the outer core 720 may form a magnetic path.
  • the magnetic flux 730 may flow along the formed magnetic path to form a magnetic closed loop.
  • the magnetic flux formed by the transmission / reception coil 520 and flowing through the first magnetic body 510 may be canceled by the magnetic flux 730 formed by the planar inductor 700.
  • a groove may be formed in at least one of the first magnetic body 510 and the second magnetic body 770. At least a portion of the inlet portion of the inductor coil 705 may be seated in the groove. As illustrated in FIG. 6, a groove 750 in which at least a portion of an inlet portion of the inductor coil 705 is seated may be formed in the first magnetic body 510. As illustrated in FIG. 7, a groove 751 in which at least a portion of the inlet portion of the inductor coil 705 is seated may be formed in the second magnetic body 770.
  • the volume increase of the wireless charging pad can be eliminated by the inlet portion.
  • the appearance of the wireless charging pad can be kept flat.
  • the inductor coil 705 may be composed of a lead portion, a winding portion, and a lead portion.
  • the lead-in portion may be defined as a portion where current flows through the inductor coil 705.
  • the lead-in portion may be described as a straight or curved portion of the inductor coil 705 that is not wound.
  • One end of the lead-in portion may be electrically connected to the electronic component.
  • the winding portion may be described as a portion where the coil is wound in one direction and has a spiral shape.
  • the winding portion may be wound in one direction along the circumference of the outer surface of the inner core 710.
  • the winding portion can be extended from the lead-in portion.
  • the lead portion may be defined as a portion through which current flows from the inductor coil 705.
  • the lead portion may be described as a portion of the inductor coil 705 that is not wound or has a straight or curved portion.
  • One end of the lead-out portion may be electrically connected to the electronic component.
  • the winding direction of the coil of the inductor coil 705 may be a direction opposite to the winding direction of the coil of the transmission / reception coil 520.
  • the inductor coil 705 may be configured in a printed circuit board (PCB) pattern.
  • PCB printed circuit board
  • the bobbins of the inner core 710 and the outer core 720 may also be manufactured.
  • the bobbin and the PCB can fix the inner core 710 and the outer core 720.
  • the inductor coil 705 is composed of a PCB pattern, a heat dissipation structure is better than that of a wire, and a higher current mill can be used than that of a wire.
  • the wireless charging pad 500 can be formed of a multi-layer substrate, thereby solving the problem of overlapping the inlet.
  • the inner core 710, the outer core 720, and the second magnetic body 770 may be integrally formed.
  • FIG. 8 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • 9 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
  • 10 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention. For convenience of description, only a portion of the wireless charging pad is shown in each drawing.
  • the wireless charging pad 500 may further include a winding guide 620.
  • the winding guide 620 is located inside the transmission / reception coil 520 and can guide coil winding of the transmission / reception coil 520.
  • the transmitting and receiving coil 520 may be wound in one direction along the circumference of the outer side of the winding guide 620.
  • the winding guide is preferably formed of polycarbonate (PC) to shield unintentional current.
  • the wireless charging pad 500 does not include a separate winding guide 620, and the planner inductor 700 can function as a winding guide.
  • the planner inductor 700 can guide coil winding of the transmission / reception coil 520.
  • the transmitting and receiving coil 520 may be wound in one direction along the circumference of the outer side of the planar inductor 700.
  • an insulator may be disposed between the planar inductor 700 and the transmit / receive coil 520. The insulator shields the unintended current and may be formed of various insulating materials, but is preferably formed of polycarbonate (PC).
  • PC polycarbonate
  • the first magnetic body 510 may be disposed while being layered with the winding guide 620 and the transmission / reception coil 520.
  • the first magnetic body 510 may be positioned on the winding guide 620.
  • the first magnetic body 510 may be located on the transmission / reception coil 520.
  • the planar inductor 700 may be disposed while being layered with the first magnetic body 510.
  • the planar inductor 700 may be disposed on the first magnetic body 510.
  • the magnetic flux generated by the planar inductor 700 flows as indicated by reference numeral 730.
  • the main magnetic flux of the power transmission by the transmission / reception coil 520 flows as indicated by reference numeral 790. Since the magnetic flux 730 by the planar inductor 700 and the magnetic flux by the transmission / reception coil 520 flow in opposite directions, flux-cancellation occurs and the maximum magnetic flux density of the first magnetic body 510 decreases. Since the planar inductor 700 and the transmitting / receiving coil 520 share the first magnetic material 510, the planar inductor 700 forms a magnetic closed loop, so even if the offset of the transmitting / receiving pad changes, the characteristics of the inductor do not change. Does not. Accordingly, the inductance of the planar inductor 700 can be derived through the following equation.
  • N is the number of turns
  • B is the magnetic flux density (peak value)
  • A is the inner cross-sectional area of the inner core
  • I is the current (peak value)
  • the designed inductance can be derived by adjusting the height of the air gap 740.
  • 11 is a view of a wireless charging pad in which a planar inductor is omitted, viewed from a specific direction.
  • 12 is a side view of a wireless charging pad with a planar inductor omitted. For convenience of description, the drawing shows only a part of the wireless charging pad.
  • FIGS. 11 to 12 illustrate the receiving pad 21 by way of example.
  • the transmission pad 14 is based on the ground, only the stacking order of the reception pad 21 and each component is reversed, and the description with reference to FIGS. 11 to 12 may be applied.
  • FIG. 11 is a bottom view of a wireless charging pad according to an embodiment of the present invention
  • FIG. 12 is a side view viewed from the direction of the arrow in FIG. 11.
  • the wireless charging pad 500 may further include a third magnetic body 512. At least a portion of the third magnetic body 512 may contact at least a portion of the first magnetic body 510.
  • the first magnetic body 510 may be disposed while being layered with the third magnetic body 512.
  • the first magnetic body 510 may be stacked on the third magnetic body 512 or the third magnetic body 512 may be stacked on the first magnetic body 510. At least a portion of the first magnetic body 510 may contact at least a portion of the third magnetic body 512.
  • the first magnetic body 510 may be disposed on the same layer (layer) as the transmission / reception coil 520. At least a portion of the first magnetic body 510 may overlap the space 513 surrounded by the third magnetic body 512 in the vertical direction.
  • the third magnetic body 512 may be disposed while being layered with the first magnetic body 510. At least a portion of the third magnetic body 512 may contact at least a portion of the first magnetic body 510. By contacting the third magnetic body 512 and the first magnetic body 512, a curb path to be cured may be formed in the first magnetic body 510 and the third magnetic body 512.
  • the third magnetic body 512 may provide a space 513 in which at least one electronic component is accommodated. Due to the continuous magnetic paths formed in the first magnetic body 510 and the third magnetic body 512, the eddy current is not applied to the electronic components accommodated inside the third magnetic body 512, and thus the EMC effect is minimized. No heat is generated by the magnetic field in the part. At least a portion of the space 513 of the third magnetic body 512 may overlap the first magnetic body 510 in the vertical direction.
  • the electronic component may include at least one of a converter, an inverter, a rectifier, and a resonant tank.
  • the electronic component may include at least one of the resonant tank 22 and the rectifier 23.
  • the wireless charging pad 500 functions as the transmission pad 14
  • the electronic component includes at least any one of the AC / DC converter 11, the DC / AC inverter 12, and the resonant tank 13 It can contain one.
  • the electronic component may be the planar inductor 700 described above.
  • the positional relationship of the first magnetic body 510, the third magnetic body 512, and the transmission / reception coil 520 may be described based on the layer.
  • the first layer 531 may be described as a different layer from the second layer 532. As illustrated in FIG. 12, the second layer 532 may be positioned on the first layer 531 in an upward direction from the ground. According to an embodiment, the first layer 531 may be positioned on the second layer 532 in an upward direction from the ground.
  • the first magnetic body 510 and the transmission / reception coil 520 may be positioned on the first layer 531.
  • the third magnetic body 512 may be located on the second layer. In this way, the first magnetic body 510, the transmitting and receiving coil 520 and the third magnetic body 512 are positioned, so that the third magnetic body 512 is disposed in a layer with the first magnetic body 510 and the transmitting and receiving coil 520. Can be.
  • the space 513 of the third magnetic body 512 may be located on the second layer 532. Accordingly, the electronic component positioned in the space 513 is positioned in the second layer 532. In this case, the planar inductor 700 disposed in the space 513 may be located in the second layer 532.
  • the transmission / reception coil 520 may be wound around the first magnetic body 510.
  • the wireless charging pad 500 may further include an insulator.
  • the insulator may be disposed between the first magnetic body 510 and the transmission / reception coil 520.
  • the insulator is formed to surround the first magnetic body 510, and the transmission / reception coil 520 may be wound in a form surrounding the insulator.
  • the insulator is preferably formed of polycarbonate.
  • the transmission / reception coil 520 may be positioned above or below the third magnetic body 512.
  • the third magnetic body 512 may include a plurality of sub magnetic bodies 512a, 512b, 512c, and 512d.
  • the plurality of sub magnetic materials may be arranged to be spaced apart from each other at a predetermined distance. At least a portion of each of the plurality of sub magnetic bodies 512a, 512b, 512c, and 512d may contact at least a portion of the first magnetic body 510. At least a portion of the first magnetic body 510 may contact a portion of each of the plurality of sub magnetic bodies 512a, 512b, 512c, and 512d.
  • the magnetic flux entering from the outer shell to the plurality of sub-magnets 512a, 512b, 512c, and 512d does not flow at intervals between the plurality of sub-magnets 512a, 512b, 512c, and 512d whose reluctance is infinite, and the first magnetic body 510 Flows into Accordingly, the amount of leakage magnetic flux is significantly reduced.
  • the first magnetic body 510 and the third magnetic body 512 are disposed in a layered manner, at least a portion of the third magnetic body 512 contacts at least a portion of the first magnetic body 510, and thus the third magnetic body 512 The magnetic flux flowing into the inner space 513 is reduced.
  • the transmission / reception coil 520 may include a lead-in portion 521 and a lead-out portion 522.
  • the lead-in portion 521 and the lead-out portion 522 of the transmission / reception coil 520 may be positioned at a gap formed between the plurality of sub-magnetic materials.
  • the first internal impedance value viewed in the direction of the arrows in the inlet unit 521 and the inlet unit 522 is the inlet unit 521 in the state in which the electronic component is not disposed. It is smaller than the second internal impedance value as viewed from the overdrawing unit 522.
  • the internal impedance value is reduced because the inductance of the transmission / reception coil 520 is canceled by the capacitance of the resonance tanks 13 and 22.
  • FIG. 13 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
  • 14 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention. For convenience of description, the drawing shows only a part of the wireless charging pad.
  • the planar inductor 700 as an electronic component may be located in the space 513 provided by the third magnetic body 512. 13 to 14, the transmission / reception coil 520 may be wound around the first magnetic body 510. The planar inductor 700 may be positioned on the first magnetic body 510.
  • the wireless charging pad 500 may further include a third magnetic body 512 at least partially contacting at least a portion of the first magnetic body 510.
  • the contents described with reference to FIGS. 11 to 12 may be applied to the third magnetic body 512.
  • the third magnetic body 512 may be disposed spaced apart from the outer surface of the planar inductor 700.
  • the magnetic flux 790 formed by the transmission / reception coil 520 and flowing through the first magnetic body 510 and the third magnetic body 512 may be canceled by the magnetic flux 730 formed by the planar inductor 700. have.

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  • Power Engineering (AREA)
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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a wireless charging pad comprising: a transmitting/receiving coil for wirelessly transmitting or receiving power; a first magnetic body arranged around the transmitting/receiving coil; and a planar inductor arranged to be layered with the magnetic body, wherein the planar inductor comprises an inner core for forming a magnetic path closed loop; an outer core surrounding at least a part of the inner core; and an inductor coil of which at least a part is positioned between the inner core and the outer core.

Description

무선 충전 패드 및 무선 충전 장치Wireless charging pad and wireless charging device
본 발명은 무선 충전 패드 및 무선 충전 장치에 관한 것이다. The present invention relates to a wireless charging pad and a wireless charging device.
전자 기기에 대한 연구가 지속됨에 따라, 전자 기기에 전기 에너지를 공급하는 무선 충전 시스템에 대한 연구도 함께 이루어지고 있다.As research into electronic devices continues, research into wireless charging systems that supply electrical energy to electronic devices is also being conducted.
이동 단말기의 무선 충전 시스템 및 전기 자동차의 무선 충전 시스템에 대해 많은 업체들이 연구 개발에 몰두하고 있다. 이러한 무선 충전 시스템에는, 무선 충전 패드와 임피던스 보상을 위한 공진 탱크를 비롯한 여러 전자 부품이 포함된다. Many companies are devoted to research and development of wireless charging systems for mobile terminals and wireless charging systems for electric vehicles. Such a wireless charging system includes several electronic components, including a wireless charging pad and a resonant tank for impedance compensation.
종래 기술에 따른 무선 충전 시스템에서 공진 탱크는, 무선 충전 패드 외부에 위치하도록 제작된다. 이 경우, 송수신 무선 충전 패드간 오프셋(offset) 변화가 있을 때, 공진형 인덕터의 특성에 변화가 생기는 문제가 발생한다.In the wireless charging system according to the prior art, the resonant tank is manufactured to be located outside the wireless charging pad. In this case, when there is an offset change between the wireless charging pads for transmission and reception, a problem arises in that the characteristics of the resonant inductor change.
공개특허 10-2007-0050907(이하, 선행 문헌 1)는 전력 변환기의 평면 트랜스포머 또는 평면 인덕터의 통합에 관한 특허로, 평면 인덕터는 전기적 절연 및 열적 전도층들에 의해 구성된 다층 기판으로 구성된다. 선행 문헌 1의 각각의 층은 평면 인덕터 형성을 위한 전기적 층이며, 그 중 하나의 층은 히트 싱크에 열적으로 결합되는 기판으로 구성된다. 선행 문헌 1에서는 권취를 PCB기판으로 한정하며, 하부 페라이트를 독릭적인 자성체를 사용하여 부피가 증가하는 문제가 발생될 수 있다.Patent Publication No. 10-2007-0050907 (hereinafter referred to as Prior Art Document 1) relates to the integration of a planar transformer or a planar inductor of a power converter, and the planar inductor is composed of a multi-layer substrate composed of electrically insulating and thermally conductive layers. Each layer of Prior Art Document 1 is an electrical layer for forming a planar inductor, one of which is composed of a substrate thermally coupled to a heat sink. In the prior document 1, the winding is limited to the PCB substrate, and the problem of increasing the volume by using a proprietary magnetic material for the lower ferrite may be generated.
공개특허 10-2013-0143079(이하, 선행 문헌 2)는 단위 면적당 큰 에너지가 저장 가능한 박막형 인덕터에 관한 특허로, 도체를 부분적으로 감싸는 제 1 강자성 요크(자기 상부섹션, 하기 자부섹션으로 구성)는 자기 상부 섹션, 자기 하부 섹션으로 구성되고, 각 섹션은 비아 영역에서 낮은 자기 저항경로를 통해 서로 결합되고, 상부섹션과 하부섹션 사이에 하나 이상의 비자기 갭을 포함한다. 선행 문헌 2는, 도체를 감싸는 박막형 암을 가지는 인덕터를 제안하는 것으로, 도체 주위의 자속이 흐르는 Path에 자기저항을 줄이기 위한 암을 설치한다. 선행 문헌 2는 공심으로 인덕턴스를 형성한다. 선행 문헌 2와 같은 구조는 페라이트와 같은 물질로 제작하기 어려우며, 높은 인덕턴스를 가지는데 제약이 있다.Patent Publication No. 10-2013-0143079 (hereinafter referred to as the prior art document 2) is a patent for a thin film type inductor capable of storing large energy per unit area, and a first ferromagnetic yoke (consisting of a magnetic upper section and the following magnetic section) partially surrounding a conductor is Consists of a magnetic top section, a magnetic bottom section, each section is coupled to each other via a low magnetic resistance path in the via region, and includes one or more non-magnetic gaps between the top section and the bottom section. Prior Document 2 proposes an inductor having a thin film-like arm surrounding a conductor, and an arm for reducing magnetic resistance is installed in a path through which magnetic flux around the conductor flows. Prior document 2 forms an inductance with an air core. The structure as in the prior document 2 is difficult to manufacture with a material such as ferrite, and has a limitation in having a high inductance.
본 발명은 상기한 문제점을 해결하기 위하여, 송수신 무선 충전 패드간에 오프셋이 발생하는 경우에도, 공진형 인덕터의 특성에 변화가 발생되지 않으면서, 부피가 증가하지 않고, 높은 인덕턴스를 가지는 인덕터를 내부에 포함하는 무선 충전 패드를 제공하는데 목적이 있다.In order to solve the above-described problem, even when an offset occurs between the wireless charging pads for transmission and reception, the volume of the resonant inductor is not increased and the inductor having a high inductance is not increased without a change in the characteristics of the resonant inductor. It is an object to provide a wireless charging pad that includes.
본 발명의 과제들은 이상에서 언급한 과제들로 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
상기 과제를 달성하기 위하여, 본 발명의 실시예에 따른 무선 충전 패드는, 내부에 이너 코어와 아우터 코어 사이에 인덕터 코일이 배치되는 플래너 인덕터를 포함한다.In order to achieve the above object, the wireless charging pad according to an embodiment of the present invention includes a planar inductor in which an inductor coil is disposed between an inner core and an outer core.
본 발명의 실시예에 따르면, 플래너 인덕터는, 자로 폐루프를 형성하는 이너 코어, 이너 코어의 적어도 일부를 둘러싸는 아우터 코어, 및 적어도 일부가 이너 코어와 아우터 코어 사이에 위치하는 인덕터 코일을 포함한다.기타 실시예들의 구체적인 사항들은 상세한 설명 및 도면들에 포함되어 있다.According to an embodiment of the present invention, the planar inductor includes an inner core forming a magnetically closed loop, an outer core surrounding at least a portion of the inner core, and an inductor coil at least partially positioned between the inner core and the outer core. Specific details of other embodiments are included in the detailed description and drawings.
본 발명에 따르면 다음과 같은 효과가 하나 혹은 그 이상 있다.According to the present invention, there are one or more of the following effects.
첫째, 무선 충전 패드 내부에 플래너 인덕터를 구비함으로써, 무선 충전 패드간에 오프셋이 발생되는 경우에도 공진형 인덕터 특성에 변화가 발생되지 않는 효과가 있다.First, by providing a planar inductor inside the wireless charging pad, even when an offset is generated between the wireless charging pads, there is an effect that the resonance inductor characteristic does not change.
둘째, 무선 충전 패드 내부에 플래너 인덕터를 구비함으로써, 전력변환부 또는 정류부 등 회로부의 부피를 감소시키고, 기계적 부담을 줄이는 효과가 있다.Second, by providing a planar inductor inside the wireless charging pad, there is an effect of reducing the volume of the circuit portion, such as a power converter or rectifier, and reduce the mechanical burden.
셋째, 무선 충전 패드의 자성체를 공유하고, 권취 가이드의 사(死)공간을 활용하는 플래너 인덕터를 삽입함으로써 부피 증가를 최소화하는 효과가 있다.Third, by sharing the magnetic material of the wireless charging pad and inserting a planar inductor utilizing the dead space of the winding guide, there is an effect of minimizing the increase in volume.
넷째, 권취 방향으로 고려할 때, flux-cancellation에 의해 무선 충전 패드 자성체의 자속값이 감소되므로, 자성체의 두께를 감소시키고 비용을 절감할 수 있는 효과가 있다.Fourth, when considering in the winding direction, the flux-cancellation reduces the magnetic flux value of the magnetic material of the wireless charging pad, thereby reducing the thickness of the magnetic material and reducing the cost.
본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
도 1은 본 발명의 실시예에 따른 무선 충전 시스템의 외관을 도시한 도면이다.1 is a view showing the appearance of a wireless charging system according to an embodiment of the present invention.
도 2는 본 발명의 실시예에 따른 무선 충전 시스템의 블럭도이다.2 is a block diagram of a wireless charging system according to an embodiment of the present invention.
도 3은 본 발명의 실시예에 따른 무선 충전 방식을 설명하는데 참조되는 도면이다.3 is a view referred to for describing a wireless charging method according to an embodiment of the present invention.
도 4는 본 발명의 실시예에 따른 무선 충전 패드의 등가 회로를 예시한다.4 illustrates an equivalent circuit of a wireless charging pad according to an embodiment of the present invention.
도 5는 본 발명의 실시예에 따른 무선 충전 패드의 구성을 설명하는데 참조되는 도면이다.5 is a view referred to for explaining the configuration of a wireless charging pad according to an embodiment of the present invention.
도 6은 본 발명의 실시예에 따른 플래너 인덕터를 특정 방향에서 바라본 도면이다. 6 is a plan view of a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
도 7은 본 발명의 실시예에 따른 플래너 인덕터의 측면도이다.7 is a side view of a planner inductor according to an embodiment of the present invention.
도 8은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드를 특정 방향에서 바라본 도면이다.8 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
도 9는 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다.9 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
도 10은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다.10 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
도 11은 플래너 인덕터가 생략된 무선 충전 패드를 특정 방향에서 바라본 도면이다.11 is a view of a wireless charging pad in which a planar inductor is omitted, viewed from a specific direction.
도 12는 플래너 인덕터가 생략된 무선 충전 패드의 측면도이다.12 is a side view of a wireless charging pad with a planar inductor omitted.
도 13은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드를 특정 방향에서 바라본 도면이다.13 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction.
도 14는 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다.14 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 명세서에 개시된 실시 예를 상세히 설명하되, 도면 부호에 관계없이 동일하거나 유사한 구성요소는 동일한 참조 번호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다. 이하의 설명에서 사용되는 구성요소에 대한 접미사 "모듈" 및 "부"는 명세서 작성의 용이함만이 고려되어 부여되거나 혼용되는 것으로서, 그 자체로 서로 구별되는 의미 또는 역할을 갖는 것은 아니다. 또한, 본 명세서에 개시된 실시 예를 설명함에 있어서 관련된 공지 기술에 대한 구체적인 설명이 본 명세서에 개시된 실시 예의 요지를 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다. 또한, 첨부된 도면은 본 명세서에 개시된 실시 예를 쉽게 이해할 수 있도록 하기 위한 것일 뿐, 첨부된 도면에 의해 본 명세서에 개시된 기술적 사상이 제한되지 않으며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다.Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar elements are assigned the same reference numbers regardless of the reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "modules" and "parts" for components used in the following description are given or mixed only considering the ease of writing the specification, and do not have meanings or roles distinguished from each other in themselves. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related known technologies are omitted when it is determined that the gist of the embodiments disclosed in this specification may be obscured. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.
제1, 제2 등과 같이 서수를 포함하는 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 상기 구성요소들은 상기 용어들에 의해 한정되지는 않는다. 상기 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.
어떤 구성요소가 다른 구성요소에 "연결되어" 있다거나 "접속되어" 있다고 언급된 때에는, 그 다른 구성요소에 직접적으로 연결되어 있거나 또는 접속되어 있을 수도 있지만, 중간에 다른 구성요소가 존재할 수도 있다고 이해되어야 할 것이다. 반면에, 어떤 구성요소가 다른 구성요소에 "직접 연결되어" 있다거나 "직접 접속되어" 있다고 언급된 때에는, 중간에 다른 구성요소가 존재하지 않는 것으로 이해되어야 할 것이다.When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.
단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. Singular expressions include plural expressions unless the context clearly indicates otherwise.
본 출원에서, "포함한다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.In this application, terms such as "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, but one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.
도 1은 본 발명의 실시예에 따른 무선 충전 시스템의 외관을 도시한 도면이다.1 is a view showing the appearance of a wireless charging system according to an embodiment of the present invention.
도 2는 본 발명의 실시예에 따른 무선 충전 시스템의 블럭도이다.2 is a block diagram of a wireless charging system according to an embodiment of the present invention.
도면을 참조하면, 무선 충전 시스템(100)은, 전력 송신 장치(10)와 전력 수신 장치(20)를 포함할 수 있다. 무선 충전 시스템(100)은, 전기 자동차 배터리의 무선 충전, 로봇 청소기의 무선 충전, 이동 단말기 배터리의 무선 충전 등에 이용될 수 있다.Referring to the drawings, the wireless charging system 100 may include a power transmitting device 10 and a power receiving device 20. The wireless charging system 100 may be used for wireless charging of an electric vehicle battery, wireless charging of a robot cleaner, wireless charging of a mobile terminal battery, and the like.
전기 자동차 배터리의 무선 충전에 무선 충전 시스템(100)이 이용되는 경우, 전력 송신 장치(10)는, 충전소 등에 설치될 수 있고, 전력 수신 장치(20)는, 차량 내부에 구비될 수 있다. 로봇 청소기 배터리의 무선 충전에 무선 충전 시스템(100)이 이용되는 경우, 전력 송신 장치(10)는, 포터블 형식으로 구성될 수 있고, 전력 수신 장치(20)는, 로봇 청소기 내부에 구비될 수 있다. 이동 단말기 배터리의 무선 충전에 무선 충전 시스템(100)이 이용되는 경우, 전력 송신 장치(10)는, 포터블 형식으로 구성될 수 있고, 전력 수신 장치(20)는, 이동 단말기 내부에 구비될 수 있다.When the wireless charging system 100 is used for wireless charging of an electric vehicle battery, the power transmission device 10 may be installed in a charging station or the like, and the power receiving device 20 may be provided inside the vehicle. When the wireless charging system 100 is used for wireless charging of the robot cleaner battery, the power transmission device 10 may be configured in a portable format, and the power receiving device 20 may be provided inside the robot cleaner. . When the wireless charging system 100 is used for wireless charging of the mobile terminal battery, the power transmission device 10 may be configured in a portable format, and the power reception device 20 may be provided inside the mobile terminal. .
전력 송신 장치(10)는, AC/DC 컨버터(11), DA/AC 인버터(12), 공진 탱크(13) 및 송신 패드(14)를 포함할 수 있다. AC/DC 컨버터(11)는, 계통(1)에서 제공되는 교류 형태의 전기 에너지를 직류 형태로 전환할 수 있다. DC/AC 컨버터(12)는, 직류 형태의 전기 에너지를 교류 형태의 전기 에너지로 전환한다. 이때, DC/AC 컨버터(12)는, 수십 내지 수백 kHz의 고주파 신호를 생성할 수 있다. 공진 탱크(13)는, 무선 충전에 적합하게 임피던스를 보상한다. 송신 패드(14)는, 전기 에너지를 무선으로 전송한다. 송신 패드(14)는, 내부에 송신 코일(15)을 포함한다.The power transmission device 10 may include an AC / DC converter 11, a DA / AC inverter 12, a resonance tank 13 and a transmission pad 14. The AC / DC converter 11 may convert electrical energy in the form of AC provided from the system 1 into a form of DC. The DC / AC converter 12 converts electrical energy in the form of direct current into electrical energy in the form of alternating current. At this time, the DC / AC converter 12 may generate high-frequency signals of tens to hundreds of kHz. The resonance tank 13 compensates for impedance suitable for wireless charging. The transmission pad 14 transmits electric energy wirelessly. The transmission pad 14 includes a transmission coil 15 therein.
전력 수신 장치(20)는, 수신 패드(21), 공진 탱크(22) 및 정류기(23)를 포함할 수 있다. 수신 패드(21)는, 전기 에너지를 무선으로 수신한다. 수신 패드(21)는, 내부에 수신 코일(25)을 포함한다. 송신 패드(14)와 수신 패드(21)는, 자기 결합(magnetic coupling)을 가지는 코일 세트(송신 코일(15) 및 수신 코일(25))를 포함한다. 송신 패드(14)와 수신 패드(21)는, 고주파 구동 신호로 인해 발생하는 자기장(magnetic field)를 매개로 물리적인 전극간의 접촉(electrical contact)없이 전기 에너지를 전달한다. 공진 탱크(22)는, 무선 충전에 적합하게 임피던스를 보상한다. 정류기(21)는, 배터리(30)에 직류 형태의 전기 에너지를 공급하기 위해, 교류 형태의 전기 에너지를 직류 형태의 전기 에너지로 전환한다. 배터리(30)는, 차량, 로봇 청소기 또는 이동 단말기에 구비될 수 있다.The power receiving device 20 may include a receiving pad 21, a resonance tank 22, and a rectifier 23. The receiving pad 21 wirelessly receives electrical energy. The receiving pad 21 includes a receiving coil 25 therein. The transmitting pad 14 and the receiving pad 21 include a coil set (transmitting coil 15 and receiving coil 25) having magnetic coupling. The transmitting pad 14 and the receiving pad 21 transmit electric energy without physical contact between physical electrodes through a magnetic field generated by a high frequency driving signal. The resonance tank 22 compensates for impedance suitable for wireless charging. The rectifier 21 converts the electrical energy in the AC form to the electrical energy in the DC form in order to supply the DC 30 with electrical energy. The battery 30 may be provided in a vehicle, a robot cleaner, or a mobile terminal.
도 3은 본 발명의 실시예에 따른 무선 충전 방식을 설명하는데 참조되는 도면이다.3 is a view referred to for describing a wireless charging method according to an embodiment of the present invention.
도 3을 참조하면, 무선 충전 시스템은, 유도 결합 방식 또는 공진 결합 방식을 이용할 수 있다.Referring to FIG. 3, the wireless charging system may use an inductive coupling method or a resonance coupling method.
유도 결합 방식(Inductive Coupling) 방식은, 인접한 두 개의 코일(coil) 중 1차 코일(coil)에 흐르는 전류의 세기를 변화시키면 그 전류에 의해 자기장이 변하고, 이로 인하여 2차 코일(coil)을 지나는 자속이 변하게 되어 2차 코일(coil)측에 유도 기전력이 생기게 되는 원리를 이용한다. 즉, 이 방식에 따르면, 두 개 도선을 공간적으로 움직이지 않고도 두 개 코일(coil)을 근접시킨 채 1차 코일(coil)의 전류만 변화시키면 유도 기전력이 생기게 된다. 이 경우, 주파수 특성은 크게 영향을 받지 않으나, 각 코일(coil)을 포함하는 송신 장치(예를 들면, 무선 충전 장치) 및 수신 장치(예를 들면, 이동 단말기) 사이의 배열(Alignment) 및 거리(Distance)에 따라 전력 효율이 영향을 받게 된다.In the inductive coupling method (Inductive Coupling), if the intensity of the current flowing through the primary coil (coil) of the two adjacent coils (coil) changes the magnetic field by the current, thereby passing through the secondary coil (coil) The principle is that the magnetic flux changes and the induced electromotive force is generated on the secondary coil side. That is, according to this method, induction electromotive force is generated when only the current of the primary coil is changed while the two coils are brought into proximity without spatially moving the two conductors. In this case, the frequency characteristic is not greatly affected, but the alignment and distance between the transmitting device (e.g., wireless charging device) and the receiving device (e.g., mobile terminal) including each coil. According to (Distance), power efficiency is affected.
공진 결합(Resonance Coupling) 방식은, 일정 거리가 떨어진 두 개의 코일(coil) 중 1차 코일(coil)에 공진 주파수(Resonance Frequncy)를 인가하여 발생한 자기장 변화량 중 일부가 동일한 공진 주파수의 2차 코일(coil)에 인가되어 2차 코일(coil)에서 유도 기전력이 발생되는 원리를 이용한다. 즉, 이 방식에 따르면, 송수신 장치가 각각 동일 주파수로 공진하는 경우, 전자파가 근거리 전자장을 통해 전달되게 되므로, 주파수가 다르면 에너지 전달이 없게 된다. 이 경우, 주파수의 선택이 중요한 문제가 될 수 있다. 소정 거리 이상 이격된 공진 주파수간에는 서로간에 에너지 전달이 없으므로, 공진 주파수 선택을 통해 충전 대상 기기를 선택할 수도 있다. 만일, 하나의 공진 주파수에 하나의 기기만이 할당되는 경우, 공진 주파수의 선택은 곧 충전 대상 기기를 선택하는 의미를 가질 수도 있다.In the resonance coupling method, a part of the amount of magnetic field variation generated by applying a resonance frequency to a primary coil among two coils separated by a certain distance is a secondary coil having the same resonance frequency ( coil) to use the principle that induced electromotive force is generated in the secondary coil. That is, according to this method, when the transmitting and receiving devices each resonate at the same frequency, since electromagnetic waves are transmitted through a short-range electromagnetic field, energy transmission is not performed at different frequencies. In this case, the choice of frequency can be an important issue. Since there is no energy transfer between the resonant frequencies spaced apart by a predetermined distance or more, the device to be charged may be selected through the selection of the resonant frequency. If only one device is allocated to one resonance frequency, the selection of the resonance frequency may have a meaning of selecting a device to be charged soon.
공진 결합 방식은 유도 결합 방식에 비해, 각 코일(coil)을 포함하는 송신 장치 및 수신 장치 사이의 배열(Alignment) 및 거리(Distance)가 상대적으로 전력 효율에 덜 영향을 주는 장점이 있다.The resonant coupling method has an advantage in that alignment and distance between a transmitting device and a receiving device including each coil have less influence on power efficiency, compared to an inductive coupling method.
도 4는 본 발명의 실시예에 따른 무선 충전 패드의 등가 회로를 예시한다.4 illustrates an equivalent circuit of a wireless charging pad according to an embodiment of the present invention.
본 발명의 실시예에 따른 무선 충전 패드(500)는, 전력 송신 장치(10)의 송신 패드(14) 또는 전력 수신 장치(20)의 수신 패드(21)로 이용될 수 있다. 무선 충전 패드(500)는, 이동 단말기와 같은 소형 장치의 무선 충전에 이용될 수 있으나, 전기 자동차와 같은 대형 장치의 무선 충전에 이용되는 것이 바람직하다.The wireless charging pad 500 according to an embodiment of the present invention may be used as the transmission pad 14 of the power transmission device 10 or the reception pad 21 of the power reception device 20. The wireless charging pad 500 may be used for wireless charging of a small device such as a mobile terminal, but is preferably used for wireless charging of a large device such as an electric vehicle.
도 4를 참조하면, 무선 충전 패드(500)는, 전력 송신용 패드(500a) 또는 전력 수신용 패드(500b)로 이용될 수 있다. 전력 송신용 패드(500a)는, 공진 탱크(13) 및 전력 송신용 코일(520a)을 포함할 수 있다. 전력 송신용 패드(500a)는, 전력 변환기(11,12)와 전기적으로 연결될 수 있다. 전력 변환기(11, 12)는, 도 2를 참조하여 설명한 AC/DC 컨버터(11) 및 DC/AC 인버터(12)를 포함할 수 있다. 전력 수신용 패드(500b)는, 공진 탱크(22) 및 전력 수신용 코일(520b)을 포함할 수 있다. 전력 수신용 패드(500b)는, 정류기(23)와 전기적으로 연결될 수 있다.Referring to FIG. 4, the wireless charging pad 500 may be used as a pad 500a for power transmission or a pad 500b for power reception. The power transmission pad 500a may include a resonance tank 13 and a power transmission coil 520a. The power transmission pad 500a may be electrically connected to the power converters 11 and 12. The power converters 11 and 12 may include an AC / DC converter 11 and a DC / AC inverter 12 described with reference to FIG. 2. The power receiving pad 500b may include a resonance tank 22 and a power receiving coil 520b. The power receiving pad 500b may be electrically connected to the rectifier 23.
도 5는 본 발명의 실시예에 따른 무선 충전 패드의 구성을 설명하는데 참조되는 도면이다. 도 5는 무선 충전 패드의 분해 사시도를 예시한다. 도 5는 수신 패드(21)를 예시하여 설명한다. 송신 패드(14)는, 지면을 기준으로 할 때, 수신 패드(21)와 적층 순서만 반대일 뿐, 도 5에 대한 설명이 적용될 수 있다.5 is a view referred to for explaining the configuration of a wireless charging pad according to an embodiment of the present invention. 5 illustrates an exploded perspective view of the wireless charging pad. 5 illustrates the receiving pad 21 by way of example. When the transmission pad 14 is based on the ground, only the stacking order of the reception pad 21 is reversed, and the description of FIG. 5 may be applied.
도 5를 참조하면, 무선 충전 패드(500)는, 제1 케이스(610), 권취 가이드(620), 적어도 하나의 송수신 코일(520), 제1 자성체(510), 알루미늄 플레이트(630), 절연 시트(640) 및 제2 케이스(650)를 포함할 수 있다.Referring to FIG. 5, the wireless charging pad 500 includes a first case 610, a winding guide 620, at least one transmission / reception coil 520, a first magnetic body 510, an aluminum plate 630, insulation A sheet 640 and a second case 650 may be included.
제1 케이스(610)는, 제2 케이스(650)와 함께 무선 충전 패드(500)의 외관을 형성할 수 있다. 제1 케이스(610)는, 제2 케이스(650)와 결합하여 내부에 공간을 형성할 수 있다. 형성된 공간에, 권취 가이드(620), 송수신 코일(520), 자성체(ferrite plate)(510), 알루미늄 플레이트(630), 절연 시트(640)가 수용될 수 있다.The first case 610 may form an external appearance of the wireless charging pad 500 together with the second case 650. The first case 610 may be combined with the second case 650 to form a space therein. In the formed space, the winding guide 620, the transmission / reception coil 520, the ferrite plate 510, the aluminum plate 630, and the insulating sheet 640 may be accommodated.
권취 가이드(620)는, 권취 가이드(620)는, 송수신 코일(520)의 내측에 위치할 수 있다. 권취 가이드(620)는, 결합시, 고정되어 움직이지 않도록 송수신 코일(520)을 구속할 수 있다. 실시예에 따라, 권취 가이드(620)는, 제1 케이스(610)와 일체형으로 형성될 수 있다. 실시예에 따라, 권취 가이드(620)는, 생략될 수 있다. 송수신 코일(520)은 나선형으로 형성되어, 전체적인 형상이 원형, 타원형 또는 다각형을 형성할 수 있다. 권취 가이드(620)는, 송수신 코일(520) 원형, 타원형 또는 다각형으로 권취될 수 있도록 원형, 타원형 또는 다각형 형상을 가질 수 있다.The winding guide 620, the winding guide 620 may be located inside the transmission / reception coil 520. The winding guide 620, when coupled, can be fixed to the transmitting and receiving coil 520 so that it is fixed and does not move. According to an embodiment, the winding guide 620 may be formed integrally with the first case 610. Depending on the embodiment, the winding guide 620 may be omitted. The transmitting / receiving coil 520 is formed in a spiral shape, so that the overall shape may form a circular, elliptical, or polygonal shape. The winding guide 620 may have a circular, elliptical or polygonal shape so that the transmission / reception coil 520 can be wound in a circular, elliptical or polygonal shape.
송수신 코일(520)은, 전력 전송을 위한 코일일 수 있다. 송수신 코일(520)은, 무선으로 전력을 송신하거나 수신할 수 있다. 무선 충전 패드(500)가 송신 패드(14)로 기능하는 경우, 송수신 코일(520)은, 송신 코일(15)로 설명될 수 있다. 무선 충전 패드(500)가 수신 패드(15)로 기능하는 경우, 송수신 코일(520)은, 수신 코일(25)로 설명될 수 있다. 송수신 코일(520)은 나선형(spiral)으로 형성될 수 있다. 송수신 코일(520)의 감김으로 인해, 송수신 코일(520)은 전체적으로 원형, 타원형 또는 다각형의 외관을 형성할 수 있다. 송수신 코일(520)은, 인입부와 인출부를 포함할 수 있다. The transmission / reception coil 520 may be a coil for power transmission. The transmission / reception coil 520 may transmit or receive power wirelessly. When the wireless charging pad 500 functions as the transmission pad 14, the transmission / reception coil 520 may be described as the transmission coil 15. When the wireless charging pad 500 functions as the receiving pad 15, the transmitting / receiving coil 520 may be described as the receiving coil 25. The transmission / reception coil 520 may be formed in a spiral shape. Due to the winding of the transmitting / receiving coil 520, the transmitting / receiving coil 520 may have an overall circular, elliptical, or polygonal appearance. The transmission / reception coil 520 may include an inlet portion and an outlet portion.
제1 자성체(510)는, 원형, 타원형 또는 다각형의 형상을 가질 수 있다. 제1 자성체(510)는, 적어도 하나의 플레이트로 구성될 수 있다. 제1 자성체(510)는, 페라이트를 이용하는 것이 바람직하다. 제1 자성체(510)는, 송수신 코일(520)과 층을지며 배치될 수 있다. 제1 자성체(510)는, 송수신 코일(520)의 위 또는 아래에 배치될 수 있다. 제1 자성체(510)는, 송수신 코일(520) 내측에 배치될 수 있다. 송수신 코일(520)은, 제1 자성체(510)를 중심으로 권취될 수 있다.The first magnetic body 510 may have a circular, elliptical, or polygonal shape. The first magnetic body 510 may be formed of at least one plate. It is preferable to use ferrite as the first magnetic body 510. The first magnetic body 510 may be disposed while being layered with the transmission / reception coil 520. The first magnetic body 510 may be disposed above or below the transmission / reception coil 520. The first magnetic body 510 may be disposed inside the transmission / reception coil 520. The transmitting and receiving coil 520 may be wound around the first magnetic body 510.
절연 시트(640)는, 의도되지 않은 전류를 차폐할 수 있다. 예를 들면, 절연 시트(640)는, 제1 자성체(510)에 흐르는 표면 전류를 차폐할 수 있다. 예를 들면, 절연 시트(640)는, 공진 탱크(530)의 커패시터가 무선 충전 패드(500) 내의 다른 구성 요소들과 통전되지 않도록 차폐할 수 있다.The insulating sheet 640 can shield unintended currents. For example, the insulating sheet 640 may shield the surface current flowing through the first magnetic body 510. For example, the insulating sheet 640 may shield the capacitor of the resonant tank 530 from being energized with other components in the wireless charging pad 500.
절연 시트(640)는, 알루미늄 플레이트(630)와 제1 자성체(510) 사이에 위치할 수 있다. 절연 시트(640)는, 여러 절연 물질로 형성될 수 있으나, 폴리카보네이트(polycarbonate, PC)로 형성되는 것이 바람직하다.The insulating sheet 640 may be positioned between the aluminum plate 630 and the first magnetic body 510. The insulating sheet 640 may be formed of various insulating materials, but is preferably formed of polycarbonate (PC).
알루미늄 플레이트(630)는, 자기장을 차폐할 수 있다. 알루미늄 플레이트(630)는, 전력 전송 및/또는 전력 수신 과정에서 발생되는 자기장이 외부로 유출되지 않도록 차폐할 수 있다. 알루미늄 플레이트(630)는, 방열 기능을 수행할 수 있다. 알루미늄 플레이트(630)는, 전력 전송 및/또는 전력 수신 과정에서 송수신 코일(520) 및/또는 제1 자성체(510)에서 발생되는 열을 무선 충전 패드(500) 외부로 유도할 수 있다.The aluminum plate 630 can shield the magnetic field. The aluminum plate 630 may shield the magnetic field generated in the process of power transmission and / or power reception from leaking to the outside. The aluminum plate 630 may perform a heat dissipation function. The aluminum plate 630 may induce heat generated from the transmission / reception coil 520 and / or the first magnetic body 510 in the process of power transmission and / or power reception to the outside of the wireless charging pad 500.
알루미늄 플레이트(630)는, 제1 자성체(510)와 제2 케이스(650) 사이에 위치할 수 있다. 예를 들면, 알루미늄 플레이트(630)는, 제1 자성체(510) 아래에 위치할 수 있다. The aluminum plate 630 may be positioned between the first magnetic body 510 and the second case 650. For example, the aluminum plate 630 may be positioned under the first magnetic body 510.
제2 케이스(650)는, 제1 케이스(610)와 무선 충전 패드(500)의 외관을 형성할 수 있다. 제2 케이스(650)는, 제1 케이스(610)와 결합하여 내부에 공간을 형성할 수 있다.The second case 650 may form an external appearance of the first case 610 and the wireless charging pad 500. The second case 650 may be combined with the first case 610 to form a space therein.
도 6은 본 발명의 실시예에 따른 플래너 인덕터를 특정 방향에서 바라본 도면이다. 도 7은 본 발명의 실시예에 따른 플래너 인덕터의 측면도이다.6 is a plan view of a planar inductor according to an embodiment of the present invention as viewed from a specific direction. 7 is a side view of a planner inductor according to an embodiment of the present invention.
무선 충전 패드(500)는, 자기 결합(Magnetic coupling)에 의해 무선으로 전력을 송신하거나 수신하는 송수신 코일(520), 송수신 코일(520) 주변에 배치되는 제1 자성체(510) 및 플래너 인덕터(planar inductor)(700)를 포함할 수 있다. 플래너 인덕터(700)는, 상술한 공진 탱크(13, 22)의 하위 구성으로 분류될 수 있다. 공진 탱크(13, 22)는, 커패시터 및 인덕터를 포함하는데, 플래너 인덕터(700)는, 공진 탱크(13, 22)의 인덕터로 기능할 수 있다. 공진 탱크(13, 22)의 인덕터는, 에너지 저장을 위해 필요하다.The wireless charging pad 500 includes a first magnetic material 510 and a planar inductor (planar) arranged around the transmitting and receiving coil 520, the transmitting and receiving coil 520 to transmit or receive power wirelessly by magnetic coupling (Magnetic coupling) inductor) 700. The planar inductor 700 may be classified into sub-constructions of the resonant tanks 13 and 22 described above. The resonant tanks 13 and 22 include a capacitor and an inductor, and the planar inductor 700 may function as an inductor of the resonant tanks 13 and 22. The inductors of the resonant tanks 13 and 22 are necessary for energy storage.
도 6은 플래너 인덕터를 아래에서 바라본 도면일 수 있다. 또는, 도 6은 플래너 인덕터를 위에서 바라본 도면일 수 있다. 도 6 내지 도 7을 참조하면, 플래너 인턱터(700)는, 평평한 형상을 가질 수 있다. 플래너 인덕터(700)는, 제1 자성체(510)와 층을 지며 배치될 수 있다.6 may be a plan view of the planar inductor from below. Alternatively, FIG. 6 may be a plan view of the planar inductor. 6 to 7, the planar inductor 700 may have a flat shape. The planar inductor 700 may be disposed while being layered with the first magnetic body 510.
플래너 인덕터(700)는, 이너 코어(710), 아우터 코어(720) 및 인덕터 코일(705)을 포함할 수 있다.The planar inductor 700 may include an inner core 710, an outer core 720, and an inductor coil 705.
이너 코어(710)는, 자성체로 형성될 수 있다. 이너 코어(710)는, 페라이트로 형성되는 것이 바람직하다. 이너 코어(710)는, 자로 폐루프를 형성할 수 있다. 이너 코어(710)는, 인덕터 코일(705)의 내측에 위치할 수 있다. 이너 코어(710)는, 링(ring) 형상의 횡단면을 가질 수 있다. 이경우, 이너 코어(710)는 링 코어로 명명될 수 있다. 실시예에 따라, 이너 코어(710)는, 사각 코어 또는 E 코어일 수 있다.The inner core 710 may be formed of a magnetic material. The inner core 710 is preferably formed of ferrite. The inner core 710 may form a closed loop with a ruler. The inner core 710 may be located inside the inductor coil 705. The inner core 710 may have a ring-shaped cross section. In this case, the inner core 710 may be referred to as a ring core. Depending on the embodiment, the inner core 710 may be a square core or an E core.
아우터 코어(720)는, 자성체로 형성될 수 있다. 아우터 코어(720)는, 페라이트로 형성되는 것이 바람직하다. 아우터 코어(720)는, 이너 코어(710)의 적어도 일부를 둘러쌀 수 있다. 아우터 코어(720)는, 인덕터 코일(705)의 외측에 위치할 수 있다. 아우터 코어(720)는, 일부가 개방된 링 형상의 횡단면을 가질 수 있다. 실시예에 따라, 아우터 코어(720)는, 사각 코어 또는 E 코어일 수 있다. 한편, 아우터 코어(720)의 개방부에는 인덕터 코일(705)의 인입부 및 인출부가 위치할 수 있다. The outer core 720 may be formed of a magnetic material. The outer core 720 is preferably formed of ferrite. The outer core 720 may surround at least a portion of the inner core 710. The outer core 720 may be located outside the inductor coil 705. The outer core 720 may have a ring-shaped cross section partially open. Depending on the embodiment, the outer core 720 may be a square core or an E core. Meanwhile, an inlet portion and an outlet portion of the inductor coil 705 may be located in the open portion of the outer core 720.
인덕터 코일(705)은, 적어도 일부가 이너 코어(710)와 아우터 코어(720) 사이에 위치할 수 있다. 인덕터 코일(705)의 권취부는, 이너 코어(710)와 아우터 코어(720) 사이에 위치할 수 있다. 예를 들면, 인덕터 코일(705)의 권취부는, 이너 코어(710)와 아우터 코어(720) 사이에 위치할 수 있다. 인덕터 코일(705)은, 이너 코어(710)의 외측면의 둘레를 따라 일방향으로 권취될 수 있다. The inductor coil 705 may be located at least partially between the inner core 710 and the outer core 720. The winding portion of the inductor coil 705 may be positioned between the inner core 710 and the outer core 720. For example, the winding portion of the inductor coil 705 may be located between the inner core 710 and the outer core 720. The inductor coil 705 may be wound in one direction along the circumference of the outer surface of the inner core 710.
도 7에 예시된 바와 같이, 아우터 코어(720)의 적어도 일부(예를 들면, 상면 또는 하면)는, 제1 자성체(510)와 접촉하고, 이너 코어(710)의 적어도 일부는, 제1 자성체(510)와 이격되어 공극(air gap)(740)을 형성할 수 있다. 또는, 이너 코어(710)의 적어도 일부(예를 들면, 상면 또는 하면)는, 제1 자성체(510)와 접촉하고, 아우터 코어(720)의 적어도 일부는, 제1 자성체(510)와 이격되어 공극을 형성할 수 있다. As illustrated in FIG. 7, at least a portion (eg, an upper surface or a lower surface) of the outer core 720 contacts the first magnetic body 510, and at least a portion of the inner core 710 is a first magnetic body Spaced apart from 510, an air gap 740 may be formed. Alternatively, at least a portion (eg, an upper surface or a lower surface) of the inner core 710 contacts the first magnetic body 510, and at least a portion of the outer core 720 is spaced apart from the first magnetic body 510 Voids can form.
플래너 인덕터(700)의 인덕턴스는, 이너 코어(710)가 제1 자성체(510)과 이격되어 형성된 공극(740) 또는 아우터 코어(720)가 제1 자성체(510)와 이격되어 형성되는 공극과 상관 관계를 가진다. 예를 들면, 플래너 인덕터(700)의 인덕턴스는, 공극(740)의 크기에 반비례할 수 있다. 예를 들면, 플래너 인덕터(700)의 인덕턴스는, 공극(740)의 높이에 반비례할 수 있다. 여기서, 공극의 높이는, 상하 방향의 길이로 정의될 수 있다.The inductance of the planar inductor 700 is correlated with the air gap 740 formed by the inner core 710 being spaced apart from the first magnetic body 510 or the air gap formed by the outer core 720 being spaced apart from the first magnetic body 510. Have a relationship For example, the inductance of the planar inductor 700 may be inversely proportional to the size of the void 740. For example, the inductance of the planar inductor 700 can be inversely proportional to the height of the void 740. Here, the height of the air gap may be defined as a length in the vertical direction.
무선 충전 패드(700)는, 제2 자성체(770)를 더 포함할 수 있다. 제2 자성체(770)는, 이너 코어(710)와 접촉할 수 있다. 제2 자성체(770)는, 아우터 코어(720)와 접촉할 수 있다. 인덕터 플래너(700)는, 제1 자성체(510) 및 제2 자성체(770) 사이에 위치할 수 있다. The wireless charging pad 700 may further include a second magnetic body 770. The second magnetic body 770 may contact the inner core 710. The second magnetic body 770 may contact the outer core 720. The inductor planner 700 may be positioned between the first magnetic body 510 and the second magnetic body 770.
플래너 인덕터(700)는, 이너 코어(710) 및 아우터 코어(720)를 매개로 자기 폐루프를 형성할 수 있다. 제1 자성체(510), 공극(740), 이너 코어(710), 제2 자성체(770) 및 아우터 코어(720)는 자로를 형성할 수 있다. 자속(730)은 형성된 자로를 따라서 흐르면서 자기 폐루프를 형성할 수 있다. The planar inductor 700 may form a magnetic closed loop through the inner core 710 and the outer core 720. The first magnetic body 510, the void 740, the inner core 710, the second magnetic body 770, and the outer core 720 may form a magnetic path. The magnetic flux 730 may flow along the formed magnetic path to form a magnetic closed loop.
송수신 코일(520)에 의해 형성되고, 제1 자성체(510)를 매개로 흐르는 자속은, 플래너 인덕터(700)에 의해 형성된 자속(730)에 의해 상쇄될 수 있다.The magnetic flux formed by the transmission / reception coil 520 and flowing through the first magnetic body 510 may be canceled by the magnetic flux 730 formed by the planar inductor 700.
제1 자성체(510) 및 제2 자성체(770) 중 적어도 어느 하나에는, 홈이 형성될 수 있다. 홈에는 인덕터 코일(705)의 인입부의 적어도 일부가 안착될 수 있다. 도 6에 예시된 바와 같이, 제1 자성체(510)에는, 인덕터 코일(705)의 인입부의 적어도 일부가 안착되는 홈(750)이 형성될 수 있다. 도 7에 예시된 바와 같이, 인덕터 코일(705)의 인입부의 적어도 일부가 안착되는 홈(751)은, 제2 자성체(770)에 형성될 수 있다. 이와 같이, 자성체(510, 770)에 홈(750, 751)을 형성하여, 인덕터 코일(705)의 인입부를 안착시킴으로써, 인입부에 의해 무선 충전 패드의 부피 증가를 해소할 수 있다. 또한, 인입부에 의한 돌출부 형성도 방지할 수 있다. 또한, 무선 충전 패드 외관을 평평하게 유지할 수 있다.A groove may be formed in at least one of the first magnetic body 510 and the second magnetic body 770. At least a portion of the inlet portion of the inductor coil 705 may be seated in the groove. As illustrated in FIG. 6, a groove 750 in which at least a portion of an inlet portion of the inductor coil 705 is seated may be formed in the first magnetic body 510. As illustrated in FIG. 7, a groove 751 in which at least a portion of the inlet portion of the inductor coil 705 is seated may be formed in the second magnetic body 770. Thus, by forming the grooves 750 and 751 in the magnetic bodies 510 and 770, and seating the inlet portion of the inductor coil 705, the volume increase of the wireless charging pad can be eliminated by the inlet portion. In addition, it is possible to prevent the formation of protrusions by the lead-in portion. In addition, the appearance of the wireless charging pad can be kept flat.
인덕터 코일(705)은, 인입부, 권취부, 인출부로 구성될 수 있다. 인입부는, 인덕터 코일(705)로 전류가 흘러 들어가는 부위로 정의될 수 있다. 인입부는, 인덕터 코일(705) 중 권취되지 않은 직선형 또는 곡선형의 부위로 설명될 수 있다. 인입부의 일단은 전자 부품과 전기적으로 연결될 수 있다. 권취부는, 코일이 일방향으로 권취되어 나선형을 가지는 부위로 설명될 수 있다. 권취부는, 이너 코어(710)의 외측면의 둘레를 따라 일방향으로 권취될 수 있다. 권취부는, 인입부로부터 연장될 수 있다. 인출부는, 인덕터 코일(705)에서 전류가 흘러 나가는 부위로 정의될 수 있다. 인출부는, 인덕터 코일(705) 중 권취되지 않은 직선형 또는 곡선형의 부위로 설명될 수 있다. 인출부의 일단은 전자 부품과 전기적으로 연결될 수 있다. 인출부는 권취부로부터 연장될 수 있다.The inductor coil 705 may be composed of a lead portion, a winding portion, and a lead portion. The lead-in portion may be defined as a portion where current flows through the inductor coil 705. The lead-in portion may be described as a straight or curved portion of the inductor coil 705 that is not wound. One end of the lead-in portion may be electrically connected to the electronic component. The winding portion may be described as a portion where the coil is wound in one direction and has a spiral shape. The winding portion may be wound in one direction along the circumference of the outer surface of the inner core 710. The winding portion can be extended from the lead-in portion. The lead portion may be defined as a portion through which current flows from the inductor coil 705. The lead portion may be described as a portion of the inductor coil 705 that is not wound or has a straight or curved portion. One end of the lead-out portion may be electrically connected to the electronic component. The withdrawal portion may extend from the winding portion.
한편, 인덕터 코일(705)의 코일의 권취 방향은, 송수신 코일(520)의 코일의 권취 방향과 반대 방향일 수 있다.Meanwhile, the winding direction of the coil of the inductor coil 705 may be a direction opposite to the winding direction of the coil of the transmission / reception coil 520.
한편, 인덕터 코일(705)은 PCB(printed circuit board) 패턴으로 구성될 수 있다. 인덕터 코일(705)을 PCB 패턴으로 구성할 때, 이너 코어(710) 및 아우터 코어(720)의 보빈도 함께 제작할 수 있다. 이경우, 보빈 및 PCB는 이너 코어(710) 및 아우터 코어(720)를 고정할 수 있다. 인덕터 코일(705)을 PCB 패턴으로 구성하면, 와이어로 구성하는 경우보다 방열구조가 좋아 와이어로 구성하는 경우보다 더 높은 전류밀더까지 사용 가능하다. 또한, 무선 충전 패드(500)를 다층 기판으로 형성할 수 있어, 인입부 겹치는 문제를 해결할 수 있다.Meanwhile, the inductor coil 705 may be configured in a printed circuit board (PCB) pattern. When configuring the inductor coil 705 in a PCB pattern, the bobbins of the inner core 710 and the outer core 720 may also be manufactured. In this case, the bobbin and the PCB can fix the inner core 710 and the outer core 720. When the inductor coil 705 is composed of a PCB pattern, a heat dissipation structure is better than that of a wire, and a higher current mill can be used than that of a wire. In addition, the wireless charging pad 500 can be formed of a multi-layer substrate, thereby solving the problem of overlapping the inlet.
한편, 이너 코어(710), 아우터 코어(720) 및 제2 자성체(770)는 일체로 형성될 수 있다.Meanwhile, the inner core 710, the outer core 720, and the second magnetic body 770 may be integrally formed.
도 8은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드를 특정 방향에서 바라본 도면이다. 도 9는 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다. 도 10은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다. 설명의 편의를 위해, 각 도면에는 무선 충전 패드의 일부 구성만 도시한다.8 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction. 9 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention. 10 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention. For convenience of description, only a portion of the wireless charging pad is shown in each drawing.
무선 충전 패드(500)는, 권취 가이드(620)를 더 포함할 수 있다. 권취 가이드(620)는, 송수신 코일(520) 내측에 위치하며, 송수신 코일(520)의 코일 권취를 가이드할 수 있다. 송수신 코일(520)은, 권취 가이드(620) 외측 측면의 둘레를 따라 일방향으로 권취될 수 있다. 권취 가이드는, 의도되지 않은 전류를 차폐할 수 있도록 폴리카보네이트(polycarbonate, PC)로 형성되는 것이 바람직하다.The wireless charging pad 500 may further include a winding guide 620. The winding guide 620 is located inside the transmission / reception coil 520 and can guide coil winding of the transmission / reception coil 520. The transmitting and receiving coil 520 may be wound in one direction along the circumference of the outer side of the winding guide 620. The winding guide is preferably formed of polycarbonate (PC) to shield unintentional current.
도 9에 예시된 바와 같이, 무선 충전 패드(500)는 별도의 권취 가이드(620)를 구비하지 않고, 플래너 인덕터(700)는 권취 가이드로 기능할 수 있다. 플래너 인덕터(700)는, 송수신 코일(520)의 코일 권취를 가이드할 수 있다. 송수신 코일(520)은, 플래너 인덕터(700) 외측 측면의 둘레를 따라 일방향으로 권취될 수 있다. 이경우, 플래너 인덕터(700)와 송수신 코일(520) 사이에는 절연체가 배치될 수 있다. 절연체는, 의도되지 않은 전류를 차폐하며, 여러 절연 물질로 형성될 수 있으나, 폴리카보네이트(polycarbonate, PC)로 형성되는 것이 바람직하다. As illustrated in FIG. 9, the wireless charging pad 500 does not include a separate winding guide 620, and the planner inductor 700 can function as a winding guide. The planner inductor 700 can guide coil winding of the transmission / reception coil 520. The transmitting and receiving coil 520 may be wound in one direction along the circumference of the outer side of the planar inductor 700. In this case, an insulator may be disposed between the planar inductor 700 and the transmit / receive coil 520. The insulator shields the unintended current and may be formed of various insulating materials, but is preferably formed of polycarbonate (PC).
도 10에 예시된 바와 같이, 제1 자성체(510)는, 권취 가이드(620) 및 송수신 코일(520)과 층을 지며 배치될 수 있다. 제1 자성체(510)는, 권취 가이드(620) 상에 위치할 수 있다. 제1 자성체(510)는, 송수신 코일(520) 상에 위치할 수 있다. 플래너 인덕터(700)는, 제1 자성체(510)와 층을 지며 배치될 수 있다. 플래너 인덕터(700)는 제1 자성체(510) 상에 배치될 수 있다.As illustrated in FIG. 10, the first magnetic body 510 may be disposed while being layered with the winding guide 620 and the transmission / reception coil 520. The first magnetic body 510 may be positioned on the winding guide 620. The first magnetic body 510 may be located on the transmission / reception coil 520. The planar inductor 700 may be disposed while being layered with the first magnetic body 510. The planar inductor 700 may be disposed on the first magnetic body 510.
플래너 인덕터(700)에 의해 발생되는 자속은 지시부호 730과 같이 흐른다. 송수신 코일(520)에 의한 전력 전송의 메인 자속은 지시부호 790과 같이 흐른다. 플래너 인덕터(700)에 의한 자속(730)과 송수신 코일(520)에 의한 자속이 서로 반대 방향으로 흐르므로, flux-cancellation이 일어나 제1 자성체(510)의 자속밀도의 최대값이 감소한다. 플래너 인덕터(700)와 송수신 코일(520)이 제1 자성체(510)를 공유하는 상태에서, 플래너 인덕터(700)가 자기 폐루프를 형성하므로, 송수신 패드의 오프셋이 변화하더라도 인덕터의 특성이 변화지 않는다. 그에 따라, 플래너 인덕터(700)의 인덕턴스는 다음과 같은 식을 통해 도출할 수 있다.The magnetic flux generated by the planar inductor 700 flows as indicated by reference numeral 730. The main magnetic flux of the power transmission by the transmission / reception coil 520 flows as indicated by reference numeral 790. Since the magnetic flux 730 by the planar inductor 700 and the magnetic flux by the transmission / reception coil 520 flow in opposite directions, flux-cancellation occurs and the maximum magnetic flux density of the first magnetic body 510 decreases. Since the planar inductor 700 and the transmitting / receiving coil 520 share the first magnetic material 510, the planar inductor 700 forms a magnetic closed loop, so even if the offset of the transmitting / receiving pad changes, the characteristics of the inductor do not change. Does not. Accordingly, the inductance of the planar inductor 700 can be derived through the following equation.
수학식 1
Figure PCTKR2019014963-appb-M000001
 Equation 1
Figure PCTKR2019014963-appb-M000001
여기서, N은 턴수, B는 자속 밀도(피크값), A는 이너 코어의 내부 단면적, I는 전류(피크값)임Here, N is the number of turns, B is the magnetic flux density (peak value), A is the inner cross-sectional area of the inner core, and I is the current (peak value)
만약, 필요 이상의 인덕턴스가 도출되는 경우, 공극(740)의 높이를 조절하여 설계된 인덕턴스를 도출할 수 있다.If more than necessary inductance is derived, the designed inductance can be derived by adjusting the height of the air gap 740.
도 11은 플래너 인덕터가 생략된 무선 충전 패드를 특정 방향에서 바라본 도면이다. 도 12는 플래너 인덕터가 생략된 무선 충전 패드의 측면도이다. 설명의 편의를 위해, 도면에는 무선 충전 패드의 일부 구성만 도시한다.11 is a view of a wireless charging pad in which a planar inductor is omitted, viewed from a specific direction. 12 is a side view of a wireless charging pad with a planar inductor omitted. For convenience of description, the drawing shows only a part of the wireless charging pad.
도 11 내지 도 12는, 수신 패드(21)를 예시하여 설명한다. 송신 패드(14)는, 지면을 기준으로 할때, 수신 패드(21)와 각 구성의 적층 순서만 반대로 되어 있을 뿐, 도 11 내지 도 12를 참조한 설명이 적용될 수 있다.11 to 12 illustrate the receiving pad 21 by way of example. When the transmission pad 14 is based on the ground, only the stacking order of the reception pad 21 and each component is reversed, and the description with reference to FIGS. 11 to 12 may be applied.
도 11은 본 발명의 실시예에 따른 무선 충전용 패드의 저면도이고, 도 12은 도 11의 화살표 방향에서 바라본 측면도이다.11 is a bottom view of a wireless charging pad according to an embodiment of the present invention, and FIG. 12 is a side view viewed from the direction of the arrow in FIG. 11.
무선 충전 패드(500)는, 제3 자성체(512)를 더 포함할 수 있다. 제3 자성체(512)의 적어도 일부는, 제1 자성체(510)의 적어도 일부와 접촉할 수 있다.The wireless charging pad 500 may further include a third magnetic body 512. At least a portion of the third magnetic body 512 may contact at least a portion of the first magnetic body 510.
도 11 내지 도 12을 참조하면, 제1 자성체(510)는, 제3 자성체(512)와 층을지며 배치될 수 있다. 제1 자성체(510)는 제3 자성체(512) 위에 적층되거나 제3 자성체(512)는 제1 자성체(510) 위에 적층될 수 있다. 제1 자성체(510)의 적어도 일부는, 제3 자성체(512)의 적어도 일부와 접촉할 수 있다. 제1 자성체(510)는, 송수신 코일(520)과 같은 층(레이어)에 배치될 수 있다. 제1 자성체(510)의 적어도 일부는, 제3 자성체(512)에 의해 둘러쌓인 공간(513)과 수직 방향으로 중첩될 수 있다.11 to 12, the first magnetic body 510 may be disposed while being layered with the third magnetic body 512. The first magnetic body 510 may be stacked on the third magnetic body 512 or the third magnetic body 512 may be stacked on the first magnetic body 510. At least a portion of the first magnetic body 510 may contact at least a portion of the third magnetic body 512. The first magnetic body 510 may be disposed on the same layer (layer) as the transmission / reception coil 520. At least a portion of the first magnetic body 510 may overlap the space 513 surrounded by the third magnetic body 512 in the vertical direction.
제3 자성체(512)는, 제1 자성체(510)와 층을지며 배치될 수 있다. 제3 자성체(512)의 적어도 일부는, 제1 자성체(510)의 적어도 일부와 접촉할 수 있다. 제3 자성체(512)와 제1 자성체(512)가 접촉함으로써, 제1 자성체(510)와 제3 자성체(512)에는 연석되는 자로가 형성될 수 있다.The third magnetic body 512 may be disposed while being layered with the first magnetic body 510. At least a portion of the third magnetic body 512 may contact at least a portion of the first magnetic body 510. By contacting the third magnetic body 512 and the first magnetic body 512, a curb path to be cured may be formed in the first magnetic body 510 and the third magnetic body 512.
제3 자성체(512)는, 적어도 하나의 전자 부품이 수용되는 공간(513)을 제공할 수 있다. 제1 자성체(510)와 제3 자성체(512)에 연속되는 자로가 형성됨으로 인해, 제3 자성체(512) 내부에 수용되는 전자 부품에 와전류(eddy current)가 미치지 않아 EMC 영향이 최소화되고, 전자 부품에 자기장에 의한 열이 발생되지 않는다. 제3 자성체(512)의 공간(513)의 적어도 일부는, 제1 자성체(510)와 수직 방향으로 중첩될 수 있다.The third magnetic body 512 may provide a space 513 in which at least one electronic component is accommodated. Due to the continuous magnetic paths formed in the first magnetic body 510 and the third magnetic body 512, the eddy current is not applied to the electronic components accommodated inside the third magnetic body 512, and thus the EMC effect is minimized. No heat is generated by the magnetic field in the part. At least a portion of the space 513 of the third magnetic body 512 may overlap the first magnetic body 510 in the vertical direction.
전자 부품은, 컨버터, 인버터, 정류기 및 공진 탱크 중 적어도 어느 하나를 포함할 수 있다. 예를 들어, 무선 충전용 패드(500)가 수신 패드(21)로 기능하는 경우, 전자 부품은 공진 탱크(22) 및 정류기(23) 중 적어도 어느 하나를 포함할 수 있다. 예를 들어, 무선 충전용 패드(500)가 송신 패드(14)로 기능하는 경우, 전자 부품은, AC/DC 컨버터(11), DC/AC 인버터(12) 및 공진 탱크(13) 중 적어도 어느 하나를 포함할 수 있다. 전자 부품은, 상술한 플래너 인덕터(700)일 수 있다. The electronic component may include at least one of a converter, an inverter, a rectifier, and a resonant tank. For example, when the wireless charging pad 500 functions as the receiving pad 21, the electronic component may include at least one of the resonant tank 22 and the rectifier 23. For example, when the wireless charging pad 500 functions as the transmission pad 14, the electronic component includes at least any one of the AC / DC converter 11, the DC / AC inverter 12, and the resonant tank 13 It can contain one. The electronic component may be the planar inductor 700 described above.
제1 자성체(510), 제3 자성체(512) 및 송수신 코일(520)의 위치 관계는, 레이어를 기준으로 설명될 수도 있다.The positional relationship of the first magnetic body 510, the third magnetic body 512, and the transmission / reception coil 520 may be described based on the layer.
제1 레이어(531)는, 제2 레이어(532)와 다른 층로 설명될 수 있다. 도 12에 예시된 바와 같이, 지면에서 위쪽 방향으로, 제1 레이어(531) 위에 제2 레이어(532)가 위치할 수 있다. 실시예에 따라, 지면에서 위쪽 방향으로, 제2 레이어(532) 위에 제1 레이어(531)가 위치할 수 있다.The first layer 531 may be described as a different layer from the second layer 532. As illustrated in FIG. 12, the second layer 532 may be positioned on the first layer 531 in an upward direction from the ground. According to an embodiment, the first layer 531 may be positioned on the second layer 532 in an upward direction from the ground.
제1 자성체(510) 및 송수신 코일(520)은 제1 레이어(531)에 위치할 수 있다. 제3 자성체(512)는, 제2 레이어에 위치할 수 있다. 이와 같이, 제1 자성체(510), 송수신 코일(520) 및 제3 자성체(512)가 위치함으로써, 제3 자성체(512)가 제1 자성체(510) 및 송수신 코일(520)과 층을지며 배치될 수 있다.The first magnetic body 510 and the transmission / reception coil 520 may be positioned on the first layer 531. The third magnetic body 512 may be located on the second layer. In this way, the first magnetic body 510, the transmitting and receiving coil 520 and the third magnetic body 512 are positioned, so that the third magnetic body 512 is disposed in a layer with the first magnetic body 510 and the transmitting and receiving coil 520. Can be.
제3 자성체(512)의 공간(513)은, 제2 레이어(532)에 위치할 수 있다. 그에 따라, 공간(513)에 위치하는 전자 부품은 제2 레이어(532)에 위치하게 된다. 이경우, 공간(513)에 배치되는 플래너 인덕터(700)는, 제2 레이어(532)에 위치할 수 있다.The space 513 of the third magnetic body 512 may be located on the second layer 532. Accordingly, the electronic component positioned in the space 513 is positioned in the second layer 532. In this case, the planar inductor 700 disposed in the space 513 may be located in the second layer 532.
송수신 코일(520)은, 제1 자성체(510) 주변에서 권취될 수 있다. 무선 충전용 패드(500)는, 절연체를 더 포함할 수 있다. 절연체는, 제1 자성체(510)와 송수신 코일(520) 사이에 배치될 수 있다. 예를 들면, 절연체는, 제1 자성체(510)를 둘러싸게 형성되고, 송수신 코일(520)은, 절연체를 감싸는 형태로 권취될 수 있다. 절연체는, 폴리카보네이트로 형성되는 것이 바람직하다. 송수신 코일(520)은, 제3 자성체(512)의 위 또는 아래에 위치할 수 있다. The transmission / reception coil 520 may be wound around the first magnetic body 510. The wireless charging pad 500 may further include an insulator. The insulator may be disposed between the first magnetic body 510 and the transmission / reception coil 520. For example, the insulator is formed to surround the first magnetic body 510, and the transmission / reception coil 520 may be wound in a form surrounding the insulator. The insulator is preferably formed of polycarbonate. The transmission / reception coil 520 may be positioned above or below the third magnetic body 512.
한편, 제3 자성체(512)는, 복수의 서브 자성체(512a, 512b, 512c, 512d)를 포함할 수 있다. 복수의 서브 자성체는 서로 소정 간격을 두고 이격되게 배치될 수 있다. 복수의 서브 자성체(512a, 512b, 512c, 512d) 각각의 적어도 일부는, 제1 자성체(510)의 적어도 일부와 접촉할 수 있다. 제1 자성체(510)의 적어도 일부는, 복수의 서브 자성체(512a, 512b, 512c, 512d) 각각의 일부와 접촉할 수 있다. 외각에서 복수의 서브 자성체(512a, 512b, 512c, 512d)로 들어오는 자속은 릴럭턴스가 무한인 복수의 서브 자성체(512a, 512b, 512c, 512d) 사이의 간격으로 흐르지 않고, 제1 자성체(510)로 흐른다. 그에 따라, 누설 자속의 양이 현격하게 줄어든다. Meanwhile, the third magnetic body 512 may include a plurality of sub magnetic bodies 512a, 512b, 512c, and 512d. The plurality of sub magnetic materials may be arranged to be spaced apart from each other at a predetermined distance. At least a portion of each of the plurality of sub magnetic bodies 512a, 512b, 512c, and 512d may contact at least a portion of the first magnetic body 510. At least a portion of the first magnetic body 510 may contact a portion of each of the plurality of sub magnetic bodies 512a, 512b, 512c, and 512d. The magnetic flux entering from the outer shell to the plurality of sub-magnets 512a, 512b, 512c, and 512d does not flow at intervals between the plurality of sub-magnets 512a, 512b, 512c, and 512d whose reluctance is infinite, and the first magnetic body 510 Flows into Accordingly, the amount of leakage magnetic flux is significantly reduced.
제1 자성체(510)와 제3 자성체(512)가 층을 지며 배치되고, 제3 자성체(512)의 적어도 일부가 제1 자성체(510)의 적어도 일부와 접촉함으로 인해, 제3 자성체(512) 내부 공간(513)으로 흘러가는 자속이 현격이 줄어든다.Since the first magnetic body 510 and the third magnetic body 512 are disposed in a layered manner, at least a portion of the third magnetic body 512 contacts at least a portion of the first magnetic body 510, and thus the third magnetic body 512 The magnetic flux flowing into the inner space 513 is reduced.
송수신 코일(520)은, 인입부(521) 및 인출부(522)을 포함할 수 있다. 송수신 코일(520)의 인입부(521)와 인출부(522)는, 복수의 서브 자성체 사이에 형성된 간격에 위치할 수 있다.The transmission / reception coil 520 may include a lead-in portion 521 and a lead-out portion 522. The lead-in portion 521 and the lead-out portion 522 of the transmission / reception coil 520 may be positioned at a gap formed between the plurality of sub-magnetic materials.
공간(513)에 전자 부품이 배치된 상태에서, 인입부(521)과 인출부(522)에서 화살표 방향으로 바라본 제1 내부 임피던스값은, 전자 부품이 배치되지 않은 상태에서, 인입부(521)과 인출부(522)에서 바라본 제2 내부 임피던스값보다 작다. 공간(513)에 전자 부품이 배치된 상태에서는, 송수신 코일(520)의 인덕턴스가 공진 탱크(13, 22)의 커패시턴스에 의해 상쇄되기 때문에 내부 임피던스값은 작아지게된다.In the state in which the electronic component is disposed in the space 513, the first internal impedance value viewed in the direction of the arrows in the inlet unit 521 and the inlet unit 522 is the inlet unit 521 in the state in which the electronic component is not disposed. It is smaller than the second internal impedance value as viewed from the overdrawing unit 522. In the state in which the electronic component is disposed in the space 513, the internal impedance value is reduced because the inductance of the transmission / reception coil 520 is canceled by the capacitance of the resonance tanks 13 and 22.
도 13은 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드를 특정 방향에서 바라본 도면이다. 도 14는 본 발명의 실시예에 따른 플래너 인덕터가 포함된 무선 충전 패드의 측면도이다. 설명의 편의를 위해, 도면에는 무선 충전 패드의 일부 구성만 도시한다.13 is a view of a wireless charging pad including a planar inductor according to an embodiment of the present invention as viewed from a specific direction. 14 is a side view of a wireless charging pad including a planner inductor according to an embodiment of the present invention. For convenience of description, the drawing shows only a part of the wireless charging pad.
도 11 내지 도 12를 참조하여 설명한 바와 같이, 제3 자성체(512)에 의해 제공되는 공간(513)에 전자 부품인 플래너 인덕터(700)가 위치할 수 있다. 도 13 내지 도 14에 예시된 바와 같이, 송수신 코일(520)은, 제1 자성체(510) 주변에서 권취될 수 있다. 플래너 인덕터(700)는, 제1 자성체(510) 상에 위치할 수 있다. As described with reference to FIGS. 11 to 12, the planar inductor 700 as an electronic component may be located in the space 513 provided by the third magnetic body 512. 13 to 14, the transmission / reception coil 520 may be wound around the first magnetic body 510. The planar inductor 700 may be positioned on the first magnetic body 510.
무선 충전 패드(500)는, 적어도 일부가 제1 자성체(510)의 적어도 일부와 접촉하는 제3 자성체(512)를 더 포함할 수 있다. 제3 자성체(512)는 도 11 내지 도 12를 참조하여 설명한 내용이 적용될 수 있다.The wireless charging pad 500 may further include a third magnetic body 512 at least partially contacting at least a portion of the first magnetic body 510. The contents described with reference to FIGS. 11 to 12 may be applied to the third magnetic body 512.
도 13 내지 도 14에 예시된 바와 같이, 제3 자성체(512)는, 플래너 인덕터(700) 외측면과 이격되어 배치될 수 있다. 송수신 코일(520)에 의해 형성되고, 제1 자성체(510) 및 제3 자성체(512)를 매개로 흐르는 자속(790)은, 플래너 인덕터(700)에 의해 형성된 자속(730)에 의해 상쇄될 수 있다.As illustrated in FIGS. 13 to 14, the third magnetic body 512 may be disposed spaced apart from the outer surface of the planar inductor 700. The magnetic flux 790 formed by the transmission / reception coil 520 and flowing through the first magnetic body 510 and the third magnetic body 512 may be canceled by the magnetic flux 730 formed by the planar inductor 700. have.
상기의 상세한 설명은 모든 면에서 제한적으로 해석되어서는 아니되고 예시적인 것으로 고려되어야 한다. 본 발명의 범위는 첨부된 청구항의 합리적 해석에 의해 결정되어야 하고, 본 발명의 등가적 범위 내에서의 모든 변경은 본 발명의 범위에 포함된다.The above detailed description should not be construed as limiting in all respects, but should be considered illustrative. The scope of the invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (18)

  1. 자기 결합에 의해 무선으로 전력을 송신하거나 수신하는 송수신 코일;A transmitting / receiving coil that transmits or receives power wirelessly by magnetic coupling;
    상기 송수신 코일 주변에 배치되는 제1 자성체; 및A first magnetic material disposed around the transmission / reception coil; And
    상기 제1 자성체와 층을 지며 배치되는 플래너 인덕터(planar inductor);를 포함하고,It includes; a planar inductor (planar inductor) disposed with the first magnetic material and the layer;
    상기 플래너 인덕터는,The planar inductor,
    자로 폐루프를 형성하는 이너 코어;An inner core forming a closed loop with a ruler;
    상기 이너 코어의 적어도 일부를 둘러싸는 아우터 코어; 및An outer core surrounding at least a portion of the inner core; And
    적어도 일부가 상기 이너 코어와 상기 아우터 코어 사이에 위치하는 인덕터 코일;을 포함하는 무선 충전 패드.And an inductor coil positioned at least partially between the inner core and the outer core.
  2. 제 1항에 있어서,According to claim 1,
    상기 인덕터 코일은,The inductor coil,
    상기 이너 코어의 외측면의 둘레를 따라 일방향으로 권취되는 무선 충전 패드.Wireless charging pad wound in one direction along the circumference of the outer surface of the inner core.
  3. 제 1항에 있어서,According to claim 1,
    상기 아우터 코어의 적어도 일부는, 상기 제1 자성체와 접촉하고,At least a portion of the outer core is in contact with the first magnetic body,
    상기 이너 코어는, 상기 제1 자성체와 이격되어 공극(air gap)을 형성하는 무선 충전 패드.The inner core, a wireless charging pad that is spaced apart from the first magnetic body to form an air gap (air gap).
  4. 제 1항에 있어서,According to claim 1,
    상기 이너 코어의 적어도 일부는, 상기 제1 자성체와 접촉하고,At least a part of the inner core is in contact with the first magnetic body,
    상기 아우터 코어는, 상기 제1 자성체와 이격되어 공극을 형성하는 무선 충전 패드.The outer core is a wireless charging pad that is spaced apart from the first magnetic body to form a void.
  5. 제 3항 또는 제 4항에 있어서,The method of claim 3 or 4,
    상기 플래너 인덕터의 인덕턴스는,The inductance of the planar inductor,
    상기 공극과 상관 관계를 가지는 무선 충전 패드.Wireless charging pad correlating with the air gap.
  6. 제 1항에 있어서,According to claim 1,
    상기 이너 코어는,The inner core,
    링 형상의 횡단면을 가지는 무선 충전 패드.Wireless charging pad with a ring-shaped cross section.
  7. 제 1항에 있어서,According to claim 1,
    상기 아우터 코어는,The outer core,
    일부가 개방된 링 형상의 횡단면을 가지는 무선 충전 패드.A wireless charging pad with a partially open ring-shaped cross section.
  8. 제 1항에 있어서,According to claim 1,
    상기 이너 코어 및 상기 아우터 코어와 접촉하는 제2 자성체;를 더 포함하고,Further comprising; a second magnetic material in contact with the inner core and the outer core,
    상기 플래너 인덕터는,The planar inductor,
    상기 제1 자성체 및 상기 제2 자성체 사이에 위치하는 무선 충전 패드.A wireless charging pad positioned between the first magnetic body and the second magnetic body.
  9. 제 1항에 있어서,According to claim 1,
    상기 플래너 인덕터는,The planar inductor,
    상기 이너 코어 및 상기 아우터 코어를 매개로 자기 폐루프를 형성하는 무선 충전 패드.A wireless charging pad forming a magnetic closed loop through the inner core and the outer core.
  10. 제 1항에 있어서,According to claim 1,
    상기 제1 자성체는,The first magnetic material,
    상기 인덕터 코일의 인입부의 적어도 일부가 안착되는 홈이 형성되는 무선 충전 패드.A wireless charging pad in which a groove in which at least a portion of an inlet of the inductor coil is seated is formed.
  11. 제 1항에 있어서,According to claim 1,
    상기 송수신 코일에 의해 형성되고, 상기 제1 자성체를 매개로 흐르는 자속은,The magnetic flux formed by the transmission / reception coil and flowing through the first magnetic body,
    상기 플래너 인덕터에 의해 형성된 자속에 의해 상쇄되는 무선 충전 패드.Wireless charging pads canceled by the magnetic flux formed by the planar inductor.
  12. 제 1항에 있어서,According to claim 1,
    권취 가이드;를 더 포함하고,Winding guide; further includes,
    상기 송수신 코일은,The transmitting and receiving coil,
    상기 권취 가이드의 외측 측면의 둘레를 따라 일방향으로 권취되는 무선 충전 패드.Wireless charging pad wound in one direction along the circumference of the outer side of the winding guide.
  13. 제 12항에 있어서,The method of claim 12,
    상기 제1 자성체는,The first magnetic material,
    상기 권취 가이드 상에 위치하고,Located on the winding guide,
    상기 플래너 인덕터는,The planar inductor,
    상기 제1 자성체 상에 위치하는 무선 충전 패드.Wireless charging pad located on the first magnetic body.
  14. 제 12항에 있어서,The method of claim 12,
    상기 송수신 코일은,The transmitting and receiving coil,
    상기 플래너 인덕터의 외측 측면의 둘레를 따라 일방향으로 권취되는 무선 충전 패드.Wireless charging pad wound in one direction along the circumference of the outer side of the planar inductor.
  15. 제 1항에 있어서,According to claim 1,
    상기 송수신 코일은,The transmitting and receiving coil,
    상기 제1 자성체 주변에서 권취되고,Wound around the first magnetic body,
    상기 플래너 인덕터는,The planar inductor,
    상기 제1 자성체 상에 위치하는 무선 충전 패드.Wireless charging pad located on the first magnetic body.
  16. 제 15항에 있어서,The method of claim 15,
    적어도 일부가 상기 제1 자성체의 적어도 일부와 접촉하는 제3 자성체;를 더 포함하는 무선 충전 패드.A wireless charging pad further comprising; a third magnetic body at least partially contacting at least a portion of the first magnetic body.
  17. 제 16항에 있어서,The method of claim 16,
    상기 제3 자성체는,The third magnetic material,
    상기 플래너 인덕터 외측면과 이격되어 배치되는 무선 충전 패드.A wireless charging pad disposed spaced apart from the outer surface of the planar inductor.
  18. 제 16항에 있어서,The method of claim 16,
    상기 송수신 코일에 의해 형성되고, 상기 제1 자성체 및 상기 제3 자성체를 매개로 흐르는 자속은,The magnetic flux formed by the transmission / reception coil and flowing through the first magnetic body and the third magnetic body,
    상기 플래너 인덕터에 의해 형성된 자속에 의해 상쇄되는 무선 충전 패드.Wireless charging pads canceled by the magnetic flux formed by the planar inductor.
PCT/KR2019/014963 2018-11-06 2019-11-06 Wireless charging pad and wireless charging device WO2020096342A1 (en)

Applications Claiming Priority (2)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1014397A1 (en) * 1998-12-15 2000-06-28 Alcatel High leakage inductor for a switched power converter
JP2002158123A (en) * 2000-11-22 2002-05-31 Tokin Corp Thin-film planar type inductor and its manufacturing method
EP1211701A1 (en) * 2000-12-04 2002-06-05 C.R.F. Società Consortile per Azioni Planar inductor with a ferromagnetic core, and fabrication method therefor
KR20130101245A (en) * 2012-03-05 2013-09-13 엘지이노텍 주식회사 Apparatus for transmitting wireless power
KR101732944B1 (en) * 2015-11-11 2017-05-08 주식회사 이엠따블유 Complex ferrite magnetic field shielding sheet, manufacturing method thereof, and antenna module using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1014397A1 (en) * 1998-12-15 2000-06-28 Alcatel High leakage inductor for a switched power converter
JP2002158123A (en) * 2000-11-22 2002-05-31 Tokin Corp Thin-film planar type inductor and its manufacturing method
EP1211701A1 (en) * 2000-12-04 2002-06-05 C.R.F. Società Consortile per Azioni Planar inductor with a ferromagnetic core, and fabrication method therefor
KR20130101245A (en) * 2012-03-05 2013-09-13 엘지이노텍 주식회사 Apparatus for transmitting wireless power
KR101732944B1 (en) * 2015-11-11 2017-05-08 주식회사 이엠따블유 Complex ferrite magnetic field shielding sheet, manufacturing method thereof, and antenna module using the same

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