CROSS REFERENCE TO RELATED APPLICATIONS
`
`[0001] This application is a continuation of U.S. application Ser. No. 15/195,390, filed Jun. 28,
`2016, entitled "Wireless Power Receiver and Control Method Thereof", which is a continuation
`of U.S. application Ser. No. 13/658,116, filed Oct. 23, 2012, now U.S. Pat. No. 9,461,364, issued
`on Oct. 4, 2016, entitled "Wireless Power Receiver and Control Method Thereof", which claims
`the benefit under 35 U.S.C. .sctn.119 of Korean Patent Application No. 10-2011-0114721, filed
`Nov. 4, 2011, entitled "Apparatus for Receiving Wireless Power and Method for Controlling
`Thereof", all of which are incorporated herein by reference in their entirety.
`
`BACKGROUND
`
`[0002] The embodiment relates to a wireless power receiver and a control method thereof.
`
`[0003] A wireless power transmission or a wireless energy transfer refers to a technology of
`wirelessly transferring electric energy to desired devices. In the 1800's, an electric motor or a
`transformer employing the principle of electromagnetic induction has been extensively used and
`then a method for transmitting electrical energy by irradiating electromagnetic waves, such as
`radio waves or lasers, has been suggested. Actually, electrical toothbrushes or electrical razors,
`which are frequently used in daily life, are charged based on the principle of electromagnetic
`induction. Until now, the long-distance transmission using the magnetic induction, the resonance
`and the short-wavelength radio frequency has been used as the wireless energy transfer scheme.
`
`[0004] Recently, among wireless power transmitting technologies, an energy transmitting
`scheme employing resonance has been widely used.
`
`[0005] Since an electric signal generated between the wireless power transmitter and the wireless
`power receiver is wirelessly transferred through coils in a wireless power transmitting system
`using electromagnetic induction, a user may easily charge electronic appliances such as a
`portable device.
`
`[0006] However, due to the thickness of each of a receiving coil, a short-range communication
`antenna and a printed circuit board constituting a receiving side, a size of an electronic appliance
`becomes larger and it is not easy to embed them in the electronic appliance. Specifically, the size
`of the electronic appliance is increased corresponding to the thickness of the receiving coil, the
`short-range communication antenna and the printed circuit board.
`
`[0007] Further, when an overcurrent flows through the short-range communication module, it is
`difficult to effectively cope with the overcurrent.
`
`[0008] Further, a magnetic field generated from the receiving coil exerts an influence on an
`inside of an electronic appliance, so that the electronic appliance malfunctions.
`
`BRIEF SUMMARY
`
`Ex.1011
`APPLE INC. / Page 1 of 12
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`[0009] The embodiment provides a wireless power receiver with a minimized thickness by
`suitably arranging a receiving coil, a short-range communication antenna and a printed circuit
`board.
`
`[0010] The embodiment provides a wireless power receiver with a reduced thickness by allowing
`a short-range communication antenna to be included in a printed circuit board.
`
`[0011] The embodiment provides a wireless power receiver which prevents an electronic
`appliance from malfunctioning using a shielding unit.
`
`[0012] The embodiment provides a wireless power receiver which breaks an overcurrent by
`using a protecting unit to protect a short-range communication module.
`
`[0013] A wireless power receiver according to anthe embodiment wirelessly receives power
`from a wireless power transmitter. The wireless power receiver includes: a printed circuit board
`having a reception space in a predetermined area; a receiving coil disposed onin the reception
`space of the printed circuit board, the for receiving coil configured to receive power from the
`wireless power transmitter in a charging mode;; and a short-range communication antenna
`disposed on the printed circuit board while surrounding the receiving coil, the short-range
`communication antenna configured to transmit and receive information in a communication
`mode; a shielding unit disposed on the receiving coil and the short-range communication
`antenna; and a controller configured to change an operating mode of the wireless power receiver
`into the charging mode or the communication mode.
`
`[0014] A wireless power receiver according to the embodiment wirelessly receives power from a
`wireless power transmitter. The wireless power receiver includes: a short-range communication
`antenna for performing short-range communication; a receiving coil disposed in a reception
`space of the printed circuit board, thefor wirelessly receiving coil configured to receive power
`from the wireless power transmitter in a charging mode; a short-range communication antenna
`disposed in the printed circuit board surrounding the receiving coil, the ; and a switch for
`changing a conducting state of the short-range communication antenna configured to transmit
`and receive information in a communication mode; a shielding unit disposed on the receiving
`coil and the short-range communication antenna; and a controller configured to change an
`operating mode according to a reception of the power, wherein the wireless power receiver
`intoopens or shorts the charging mode or switch according to the communication modereception
`of the power.
`
`[0015] A method of controlling a wireless power receiver, which includes a short-range
`communication antenna for communicating with an outside, according to the embodiment
`includes determining whether power is received from a transmitting coil through electromagnetic
`induction; opening a switch which changes a conducting state of the short-range communication
`antenna when the power is received; identifying whether an amount of received power is equal to
`or greater than a threshold value; and shorting the switch when the amount of the received power
`is equal to or greater than the threshold value.
`
`Ex.1011
`APPLE INC. / Page 2 of 12
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`[0016] According to the embodiments, the thickness of the wireless power receiver can be
`minimized by suitably arranging the receiving coil, the short-range communication antenna and
`the printed circuit board.
`
`[0017] According to the embodiments, the wireless power receiver can be prevented from being
`broken by preventing an overcurrent from flowing in the wireless power receiver and
`malfunction of the wireless power receiver can be prevented by shielding a magnetic field.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0018] FIG. 1 is a view showing a wireless power transmission system according to the
`embodiment;
`
`[0019] FIG. 2 is an equivalent circuit diagram of a transmitting coil according to the
`embodiment;
`
`[0020] FIG. 3 is an equivalent circuit diagram of the wireless power transmission system
`according to the embodiment;
`
`[0021] FIG. 4 is a block diagram of a wireless power receiver according to the embodiment;
`
`[0022] FIG. 5 is a view showing an example of a configuration of the wireless power receiver
`according to the embodiment;
`
`[0023] FIG. 6 is a exploded perspective and sectional view illustrating the wireless power
`receiver according to the embodiment;
`
`[0024] FIG. 7 is a sectional view showing an arrangement of elements of the wireless power
`receiver according to the embodiment;
`
`[0025] FIG. 8 is a view illustrating a top surface and a bottom surface of the wireless power
`receiver according to the embodiment;
`
`[0026] FIG. 9 is a view illustrating one example of attaching a shielding unit onto the wireless
`power receiver according to the embodiment;
`
`[0027] FIG. 10 is a view illustrating one example of inserting the shielding unit into the wireless
`power receiver according to the embodiment; and
`
`[0028] FIG. 11 is a flowchart illustrating a control method of the wireless power receiver
`according to the embodiment.
`
`DETAILED DESCRIPTION OF THE EMBODIMENTS
`
`[0029] Hereinafter, exemplary embodiments of the disclosure will be described in detail so that
`those skilled in the art can easily comprehend the disclosure.
`
`[0030] FIG. 1 illustrates a wireless power transmission system according to an embodiment.
`
`Ex.1011
`APPLE INC. / Page 3 of 12
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`[0031] The power generated from a power source 100 is provided to a wireless power transmitter
`200, such that the power is transferred by electromagnetic induction to a wireless power receiver
`300.
`
`[0032] In detail, the power source 100 is an AC power source for supplying AC power of a
`predetermined frequency.
`
`[0033] The wireless power transmitter 200 includes a transmitting coil 210. The transmitting coil
`210 is connected to the power source 100, such that an AC current flows through the transmitting
`coil 210. When the AC current flows through the transmitting coil 210, an AC current is induced
`to the receiving coil 310 physically apart from the transmitting coil 210 due to electromagnetic
`induction, so that the AC power is transferred to the wireless power receiver 300.
`
`[0034] Power may be transferred by electromagnetic induction between two LC circuits which
`are impedance-matched with each other. The power transmission through electromagnetic
`induction may enable high efficiency power transmission.
`
`[0035] The wireless power receiver 300 may include a receiving coil 310, a rectifier circuit 320
`and a load 330. In the embodiment, the load 330 may be not included in the wireless power
`receiver 300, but may be provided separately. The power transmitted through the transmitting
`coil 210 is received at the receiving coil 310 by electromagnetic induction. The power
`transferred to the receiving coil 310 is transferred through the rectifier circuit 320 to the load
`330.
`
`[0036] FIG. 2 is an equivalent circuit diagram of the transmitting coil 210 according to the
`embodiment.
`
`[0037] As shown in FIG. 2, the transmitting coil 210 may include an inductor L1 and a capacitor
`C1, and form a circuit having a suitable inductance value and a suitable capacitance value. The
`capacitor C1 may be a variable capacitor. By controlling the variable capacitor, an impedance
`matching may be performed. Meanwhile, an equivalent circuit of the receiving coil 320 may be
`equal to that depicted in FIG. 2.
`
`[0038] FIG. 3 is an equivalent circuit diagram of the wireless power transmitting system
`according to the embodiment.
`
`[0039] As shown in FIG. 3, the transmitting coil 210 may include an inductor L1 having a
`predetermined inductance value and a capacitor C1 having a predetermined capacitance value.
`
`[0040] Further, as shown in FIG. 3, the receiving coil 310 may include an inductor L2 having a
`predetermined inductance value and a capacitor C2 having a predetermined capacitance value.
`The rectifier circuit 320 may include a diode D1 and a rectifying capacitor C3 such that the
`rectifier circuit 320 converts AC power into DC power and outputs the DC power.
`
`[0041] Although the load 330 is denoted as a DC power source, the load 330 may be a battery or
`other devices requiring DC power.
`
`Ex.1011
`APPLE INC. / Page 4 of 12
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`[0042] Next, a wireless power receiver according to the embodiment will be described with
`reference to FIGS. 4 to 10.
`
`[0043] FIG. 4 is a block diagram of a wireless power receiver according to the embodiment, FIG.
`5 is a view showing an example of a configuration of the wireless power receiver according to
`the embodiment, FIG. 6 is a exploded perspective and sectional view illustrating the wireless
`power receiver according to the embodiment, FIG. 7 is a sectional view showing an arrangement
`of elements of the wireless power receiver according to the embodiment, FIG. 8 is a view
`illustrating a top surface and a bottom surface of the wireless power receiver according to the
`embodiment, FIG. 9 is a view illustrating one example of attaching a shielding unit onto the
`wireless power receiver according to the embodiment, and FIG. 10 is a view illustrating one
`example of inserting the shielding unit into the wireless power receiver according to the
`embodiment.
`
`[0044] First, referring to FIG. 4, the wireless power receiver 300 may include a receiving coil
`310, a short-range communication antenna 340, a switch 350, a protecting unit 360, a short-range
`communication module 370, a shielding unit 380, and a controller 390.
`
`[0045] The wireless power receiver 300 according to the embodiment may be installed in a
`terminal or an electronic appliance requiring power, such as a portable terminal, a laptop
`computer, and a mouse.
`
`[0046] The receiving coil 310 receives power from the transmitting coil 210 of the wireless
`power transmitter 200 through electromagnetic induction. That is, if a magnetic field is generated
`as an AC current flows through the transmitting coil 210, a current is induced to the receiving
`coil 310 by the generated magnetic field so that an AC current flows therethrough.
`
`[0047] In the embodiment, the receiving coil 310 may be disposed in a reception space of a
`printed circuit board 301.
`
`[0048] The receiving coil 310 may be provided by winding a conducting wire server times. In
`the embodiment, the receiving coil 310 may have a spiral shape, but the embodiment is not
`limited thereto.
`
`[0049] The short-range communication antenna 340 may communicate with a reader capable of
`performing a short-range communication. The short-range communication antenna 340 may
`perform a function of an antenna which transmits and receives information to and from the
`reader. In the embodiment, the short-range communication antenna 340 may be disposed at an
`outside of the receiving coil 310. In the embodiment, the receiving coil 310 may be disposed in
`the reception space inside the printed circuit board 301, and the short-range communication
`antenna 340 may be disposed to surround the receiving coil 310 on the printed circuit board 301.
`
`[0050] The above configuration will be described in more detail with reference to FIG. 6.
`
`[0051] Referring to the exploded perspective view of the wireless power receiver 300 shown in
`FIG. 6(a), the wireless power receiver 300 may include a case 302, the printed circuit board 301,
`the receiving coil 310, the short-range communication antenna 340 and the shielding unit 380.
`
`Ex.1011
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`Here, the case 302 refers to a case of a portable terminal, but the embodiment is not limited
`thereto. The shielding unit 380 will be described later.
`
`[0052] Referring to FIG. 6(a), it may be identified that the receiving coil 310 is disposed in the
`reception space A of the printed circuit board 301 and the short-range communication antenna
`340 is disposed on the printed circuit board 301. That is, the receiving coil 310 may be disposed
`in the reception space A provided inside the printed circuit board 301, and the short-range
`communication antenna 340 may be disposed at an upper side of the printed circuit board 301
`while surrounding the reception space A.
`
`[0053] FIG. 6 (b) is a sectional view showing the arrangement of the elements of the wireless
`power receiver 300 illustrated in FIG. 6(a).
`
`[0054] In the embodiment, the printed circuit board 301, the receiving coil 310 and the short-
`range communication antenna 340 may be inserted into the case 302 through the injection
`molding. Further, as described above, the short-range communication antenna 340 may be
`disposed at an outer periphery on the printed circuit board 301 while surrounding the receiving
`coil 310 placed in the reception space A.
`
`[0055] Hereinafter, the arrangement among the receiving coil 310, the short-range
`communication antenna 340 and the printed circuit board 301 will be described in more detail
`with reference to FIGS. 7 and 8.
`
`[0056] First, referring to FIG. 7, the printed circuit board 301 has the reception space A in a
`predetermined area thereof. In the embodiment, the predetermined area may include the central
`portion of the printed circuit board 301. In the embodiment, the central portion of the printed
`circuit board 301 may have the reception space having a polygonal shape, such as a rectangular
`shape and a circular shape.
`
`[0057] The receiving coil 310 is disposed in the reception space A of the printed circuit board
`301, and receives power from the transmission induction coil 210 through electromagnetic
`induction. In the embodiment, the receiving coil 310 and the printed circuit board 301 may be
`manufactured such that the thickness of the receiving coil 310 may be equal to that of the printed
`circuit board 301 or the thickness of the receiving coil 310 may be less than that of the printed
`circuit board 301. In this case, the increase of the thickness of the wireless power receiver 300
`due to the thicknesses of the receiving coil 310 and the short-range communication antenna 340
`is prevented, so that the wireless power receiver 300 can be easily embedded in the case of the
`portable terminal.
`
`[0058] In the embodiment, the receiving coil 310 may be manufactured to have a shape in match
`with a shape of the reception space A of the printed circuit board 310. For example, when the
`shape of the reception space A of the printed circuit board 310 is rectangular, the receiving coil
`310 or the conducting wire may be wound in a rectangular shape. When the shape of the
`reception space A of the printed circuit board 310 is circular, the receiving coil 310 or the
`conducting wire may be wound in a circular shape. Thus, the receiving coil 310 or the
`conducting wire may have various shapes.
`
`Ex.1011
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`[0059] The short-range communication antenna 340 may be included in the printed circuit board
`301 and may be configured to surround the receiving coil 310. In the embodiment, the short-
`range communication antenna 340 may be manufactured such that the short-range
`communication antenna 340 may be embedded in the printed circuit board 301, and may be
`configured to surround the outer periphery of the receiving coil 310 having various shapes such
`as a rectangular shape or a circular shape. In this case, the increase of the thickness of the
`wireless power receiver 300 due to the thickness of the printed circuit board 301 and the short-
`range communication antenna 340 can be prevented so that the wireless power receiver 300 can
`be easily installed in the case of the portable terminal.
`
`[0060] The wireless power receiver 300 may further include a shielding unit 380 for shielding a
`magnetic field generated by the receiving coil 310. In the embodiment, the shielding unit 380
`may be disposed to cover an area occupied by the receiving coil 310. In the embodiment, the
`shielding unit 380 may be disposed on the receiving coil 310 and the short-range communication
`antenna 340 such that the shielding unit 380 may include the area occupied by the receiving coil
`310 and the short-range communication antenna 340.
`
`[0061] In the embodiment, the shielding unit 380 may have a reception space in a predetermined
`area thereof. A wireless charging circuit 375, which is place on the top surface of the printed
`circuit board 301, may be disposed in the reception space of the shielding unit 380. The wireless
`charging circuit 375 may include a rectifier circuit for converting AC power into DC power, a
`capacitor for removing a noise signal, and a main IC chip for performing the operation for the
`wireless power reception.
`
`[0062] In the embodiment, the shielding unit 380 and the wireless charging circuit 375 may be
`manufactured such that the thickness of the shielding unit 380 may be equal to that of the
`wireless charging circuit 375 or the thickness of the shielding unit 380 may be less than that of
`the wireless charging circuit 375. In this case, the increase of the thickness of the wireless power
`receiver 300 due to the thicknesses of the shielding unit 380 and the wireless charging circuit 375
`can be prevented, so that the wireless power receiver 300 can be easily installed in the case of the
`portable terminal.
`
`[0063] FIG. 8(a) is a view showing a bottom surface of the wireless power receiver according to
`the embodiment and FIG. 8(b) is a view showing a top surface of the wireless power receiver
`according to the embodiment.
`
`[0064] FIG. 8(a) illustrates the arrangement of the printed circuit board 310, the receiving coil
`310 and the short-range communication antenna 340 according to the embodiment. The printed
`circuit board 301 has a reception space A in the central area, and the receiving coil 310 having a
`rectangular shape is disposed in the reception space A. The short-range communication antenna
`340 is embedded in the printed circuit board 301. In this case, the increase of the thickness of the
`wireless power receiver 300 due to the thickness of the printed circuit board 301 and the short-
`range communication antenna 340 can be prevented, so that the wireless power receiver 300 can
`be easily installed in the case of the portable terminal.
`
`[0065] Further, the receiving coil 310 and the printed circuit board 301 may be manufactured
`such that the thickness of the receiving coil 310 may be equal to that of the printed circuit board
`
`Ex.1011
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`301 or the thickness of the receiving coil 310 may be less than that of the printed circuit board
`301. In this case, the increase of the thickness of the wireless power receiver 300 due to the
`thickness of the receiving coil 310 and the printed circuit board 301 can be prevented, so that the
`wireless power receiver 300 can be easily installed in the case of the portable terminal.
`
`[0066] FIG. 8 (b) illustrates the arrangement of the wireless charging circuit 375 and the
`shielding unit 380 according to the embodiment. The shielding unit 380 may have a reception
`space in a predetermined area thereof, and the wireless charging circuit 375 may be disposed in
`the reception space of the shielding unit 380.
`
`[0067] In the embodiment, the shielding unit 380 and the wireless charging circuit 375 may be
`manufactured such that the thickness of the wireless charging circuit 375 may be equal to that of
`the wireless charging circuit 375 or the thickness of the shielding unit 380 may be less than that
`of the wireless charging circuit 375. In this case, the increase of the thickness of the wireless
`power receiver 300 due to the thickness of the shielding unit 380 and the wireless charging
`circuit 375 can be prevented, so that the wireless power receiver 300 can be easily installed in the
`case of the portable terminal.
`
`[0068] Referring again to FIG. 4, although various technologies can be applied to a short-range
`communication protocol used in the wireless communication antenna 340 and a short-range are
`communication module 370 which will be described below, NFC (Near Field Communication)
`may be preferably used for the wireless communication antenna 340 and the short-range
`communication module 370. The NFC is a technology for performing wireless communication in
`a short-range through the bandwidth of 13.56 MHz.
`
`[0069] The switch 350 is connected to the short-range communication antenna 340 and receives
`an open or short signal from the controller 390 to be described below such that the switch 350
`may change a conducting state of the short-range communication antenna.
`
`[0070] If it is determined that the power is received from the transmitting coil 320, the switch
`350 may receive the open signal from the controller 390 such that the switch 350 may break the
`current from flowing through the short-range communication antenna 340.
`
`[0071] If the wireless power receiver 300 is charged with an amount of power equal to or higher
`than a threshold value, the switch 350 may receive the short signal from the controller 390 such
`that the switch 350 may conduct the current through the short-range communication antenna 340,
`so the switch 350 may allow the short-range communication antenna 340 to be operated.
`
`[0072] The protecting unit 360 is operated when a current equal to or higher than a threshold
`current value flows through the protecting unit 360, such that the protecting unit 360 may break
`the current equal to or higher than the threshold current value from being transferred to the short-
`range communication module 370,.
`
`[0073] In the embodiment, as shown in FIG. 5, the protecting unit 360 may include at least one
`zener diode. The zener diode may allow only a current having a value equal to or less than a
`threshold current value to flow through a circuit. The threshold current value may be variably set
`
`Ex.1011
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`

`and may be a limit value at which the short-range communication module 370 may be normally
`operated.
`
`[0074] When a current transferred to the short-range communication antenna 340 has the
`threshold current value or above, the protecting unit 360 changes the flowing direction or the
`flow of the current to prevent an overcurrent from flowing through the short-range
`communication module 370.
`
`[0075] Referring to FIG. 5, if the current flowing through the short-range communication
`antenna 340 has the threshold current value or above, the protecting unit 350 is operated.
`Referring to FIG. 5, when the current flowing in the A-direction has the threshold current value
`or above, the current having the threshold current value or above flows into the zener diode
`placed at an upper side of the protecting unit 350.
`
`[0076] In a case that the current flowing in the B-direction has the threshold current value or
`above, the same procedure is performed.
`
`[0077] An overcurrent having the threshold current value or above flows through the zener diode
`and is discharged as thermal energy. That is, the protecting unit 360 may prevent the overcurrent
`from flowing through the short-range communication module 370, so that damage of the
`communication module 370 may be prevented.
`
`[0078] Referring again to FIG. 4, the short-range communication module 370 may receive a
`current through the short-range communication antenna 340. Although various types of
`communication technologies can be applied to the short-range communication module 370, the
`NFC (Near Field Communication) protocol may be preferably used.
`
`[0079] The shielding unit 380 may change a direction of the magnetic field generated from the
`receiving coil 310. The shielding unit 380 may absorb the magnetic field generated from the
`receiving coil 310 and may discharge the absorbed magnetic field as thermal energy.
`
`[0080] That is, as the shielding unit 380 may change the direction of the magnetic field generated
`from the coil 310 or absorb and discharge the magnetic field as thermal energy, it is possible to
`prevent the magnetic field from exerting bad influence upon any other elements inside an
`electronic appliance to which the wireless power receiver 300 is installed. That is, the shielding
`unit 380 can prevent the malfunction caused by the magnetic field applied to other elements.
`
`[0081] The shielding unit 380 may include ferrite, but the embodiment is not limited thereto.
`
`[0082] The shielding unit 380 may be disposed at one side of the wireless power receiver 300.
`
`[0083] Hereinafter, the arrangement of the shielding unit 380 on the wireless power receiver 300
`will be described with reference to FIGS. 9 and 10.
`
`[0084] First, referring to FIG. 9, after the short-range communication antenna 340 has been
`disposed on the printed circuit board 301, the shielding unit 380 may be attached to one side of
`the printed circuit board 301 with an adhesive.
`
`Ex.1011
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`[0085] Referring to FIG. 10, while the procedure of disposing the short-range communication
`antenna 340 onor receiving coil (310)(not shown in the FIG. 10) in the printed circuit board 301
`is being performed, the shielding unit 380 may be inserted into the printed circuit board 301.
`That is, unlike FIG. 9, since the shielding unit 380 is disposed in the printed circuit board 301,
`the procedure of disposing the shielding unit 380 may be included in the procedure of disposing
`the short-range communication antenna 340 without performing the procedure of disposing the
`shielding unit 380 at one side of the printed circuit board 301. That is, as described above,
`according to the embodiment shown in FIG. 8, when the shielding unit 380 is inserted into the
`printed circuit board 301, the entire thickness of the wireless power receiver 300 may be reduced
`corresponding to the thickness of the adhesive 303. Thus, a separate procedure of attaching the
`shielding unit 380 is not necessary, so the manufacturing process may be simplified.
`
`[0086] Referring again to FIG. 4, the controller 390 may control an entire operation of the
`wireless power receiver 300.
`
`[0087] The controller 390 may change an operating mode of the wireless power receiver 300 into
`a charging mode or a communication mode according to a reception of the power. In the
`embodiment, the charging mode may be that the wireless power receiver 300 does not
`communicate with an outside through the short-range communication module 370, but receives
`power from the transmitting coil 210. The communication mode may be that the wireless power
`receiver 300 does not receive power from the transmitting coil 210, but communicate with an
`outside through the short-range communication module 370.
`
`[0088] The controller 390 may change the conducting state of the short-range communication
`antenna 340 by opening or shorting the switch 350. If a current is induced to the receiving coil
`310 in the state that the switch 350 is shorted, the controller 390 may open the switch 350 to
`change the operating mode of the wireless power receiver 300 into the charging mode. That is, if
`the controller 390 receives power from the transmitting coil 210, the controller 390 opens the
`switch 350 to prevent the current from flowing through the short-range communication antenna
`340. In the state that the switch 350 is opened, if a current is not induced to the receiving coil
`310, the controller 390 may short the switch 350 to change the operating mode of the wireless
`power receiver 300 into the communication mode. That is, if the controller does not receive
`power from the transmitting coil 210, the controller 390 may short the switch 350 to allow a
`current to conduct the short-range communication antenna 340.
`
`[0089] The controller 390 may sense the current flowing through the receiving coil 310 for
`changing the conductive state of the short-range communication antenna 340. In another
`embodiment, the wireless power receiver 300 may further include a separate current sensing unit
`(not shown) which can sense the current induced to the receiving coil 310 to sense the current
`flowing through the receiving coil 310.
`
`[0090] The controller 390 may open or short the switch 350 according to an amount of power
`received at the wireless power receiver 300. This will be described below with reference to FIG.
`11.
`
`Ex.1011
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`[0091] FIG. 11 is a flowchart illustrating a control method of the wireless power receiver
`according to the embodiment.
`
`[0092] Hereinafter, the control method of the wireless power receiver according to the
`embodiment will be described with reference to FIGS. 1 to 10.
`
`[0093] In step S101, the controller 390 may determine whether the receiving coil 310 receives
`power from the transmitting coil 210 through electromagnetic induction. In the embodiment, the
`wireless power receiver 300 may further include a detecting unit (not shown) to determine
`whether power is received. A detecting coil may be used as the detecting unit.
`
`[0094] In step S103, if it is determined that the receiving coil 310 receives power from the
`transmitting coil 210 through electromagnetic induction, the switch 350, which changes the
`conductive state of the short-range communication antenna 340, may be opened. That is, the
`controller 390 may transmit an open signal to the switch 350 to prevent the current from flowing
`through the short-range communication antenna 340. In the embodiment, when it is determined
`that the receiving coil 310 receives power from the transmitting coil 210 through electromagnetic
`induction, the wireless power receiver 300 may be in the charging mode. When the wireless
`power receiver 200 is operated in the charging mode to receive power from the transmitting coil
`310, the current flowing through the short-range communication antenna must be shut off
`because the ma