WO2019107748A1 - Dispositif et système de charge sans fil - Google Patents

Dispositif et système de charge sans fil Download PDF

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Publication number
WO2019107748A1
WO2019107748A1 PCT/KR2018/012689 KR2018012689W WO2019107748A1 WO 2019107748 A1 WO2019107748 A1 WO 2019107748A1 KR 2018012689 W KR2018012689 W KR 2018012689W WO 2019107748 A1 WO2019107748 A1 WO 2019107748A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power
wireless power
wireless
wireless charging
Prior art date
Application number
PCT/KR2018/012689
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English (en)
Korean (ko)
Inventor
송일종
Original Assignee
엘지이노텍 주식회사
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Publication of WO2019107748A1 publication Critical patent/WO2019107748A1/fr

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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
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • Embodiments relate to wireless power transmission techniques, and more particularly, to wireless charging devices and systems.
  • Electric devices such as electric drills and vacuum cleaners or portable terminals such as mobile phones and notebooks include batteries for storing electric power and circuits for charging and discharging the batteries. In order to charge the battery of such an electric device, electric power must be supplied from an external charger.
  • a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly are proposed.
  • a wireless charging system comprises a wireless power transmitter for supplying electric energy in a wireless power transmission mode and a wireless power receiver for receiving electric energy supplied from a wireless power transmitter to charge the battery.
  • Such a wireless charging system may transmit power by at least one wireless power transmission scheme (e.g., electromagnetic induction scheme, electromagnetic resonance scheme, RF wireless power transmission scheme, etc.).
  • a wireless power transmission scheme e.g., electromagnetic induction scheme, electromagnetic resonance scheme, RF wireless power transmission scheme, etc.
  • the embodiments are designed to solve the problems of the prior art described above, and the object of the embodiment is to provide a wireless charging device and a system.
  • Still another object of the present invention is to provide a high-power wireless charging apparatus and system with high charging efficiency.
  • a wireless charging apparatus for wirelessly transmitting high power to a wireless power receiver, the wireless charging apparatus comprising: Inverter; A transmission unit including a resonance capacitor and a transmission coil and to which the AC voltage is applied; A demodulator for demodulating the in-band signal modulated from the wireless power receiver; A sensing unit for measuring a rail voltage and a rail current of the first node; Wherein the main control unit detects output power based on the measured rail voltage and the rail current and the number of turns of the transmission coil may be 10 times or less the number of turns of the reception coil of the radio power receiver.
  • the main control unit can determine whether the wireless power receiver is capable of high-power wireless charging based on the in-band signal.
  • the wireless charging apparatus may further include: a rectifying unit for rectifying the commercial AC power to the DC voltage; A rail voltage switch disposed between the rectifying section and the first node; And a rail voltage controller for controlling the rail voltage switch, wherein the rail voltage controller can turn off the rail voltage switch in the ping mode and turn on the rail voltage switch in the power transmission mode.
  • the wireless charging apparatus may further include: a transformer for transforming the rectified DC voltage to generate a low voltage; And a low voltage supplier for providing the low voltage to the first node.
  • the wireless charger further includes a detection unit that generates a comparison signal based on the transmission coil voltage of the transmission coil, and the detection unit generates the comparison signal using the low voltage when the mode is the ping mode, In the power transmission mode, the comparison signal can be generated using the rectified DC voltage.
  • the main control unit may determine the presence or absence of the wireless power receiver based on the comparison signal.
  • the main control unit may control the inverter to generate wireless power by fixing the operating frequency requested by the wireless power receiver.
  • a wireless charging apparatus includes a resonant capacitor and a receiving coil and receives the wireless power.
  • the wireless charging apparatus includes: ; A rectifier for rectifying the radio power to generate DC power; A DC / DC converter for converting the DC power into a charging power of a specific intensity required by the load; A modulator for modulating the control signal into an in-band signal and providing the modulated signal to the receiver; And a main controller for providing the control signal, wherein the number of turns of the receiving coil may be 1/10 or more times the number of turns of the transmitting coil of the radio power transmitter.
  • the DC / DC converter may be a step-down converter.
  • the main control unit may generate a control signal for requesting the wireless power transmitter to generate wireless power by fixing the wireless power transmitter at a predetermined operating frequency.
  • Embodiments can provide a wireless charging device and system.
  • the embodiment can perform high-power wireless charging with high charging speed and high charging efficiency.
  • the embodiment can perform high-power wireless charging capable of stable charging.
  • the charging area is increased, and high-power wireless charging with high charging degree of freedom can be performed.
  • the embodiment can wirelessly charge only when high power wireless charging is supported, thereby preventing power waste and protecting peripheral devices.
  • high power wireless charging capable of detecting foreign matter can be performed.
  • the embodiment can wirelessly charge the battery with high power to reduce power consumption.
  • FIG. 1 is a block diagram for explaining a wireless charging system according to an embodiment.
  • FIG. 2 is a block diagram illustrating a wireless charging apparatus for transmitting wireless power according to an embodiment.
  • FIG. 3 is a circuit diagram for explaining a detection unit of the wireless charging apparatus of FIG.
  • FIG. 4 is a circuit diagram for explaining the operation of the detection unit of Fig.
  • FIG. 5 is a circuit diagram for explaining the operation of the detecting unit of FIG.
  • Fig. 6 is a view showing the arrangement of the wireless charging device of Fig. 2 disposed on the substrate and the shielding member.
  • FIG. 7 is a block diagram for explaining a wireless charging apparatus for receiving wireless power interlocked with the wireless charging apparatus for transmitting wireless power according to the FIG. 2.
  • FIG. 7 is a block diagram for explaining a wireless charging apparatus for receiving wireless power interlocked with the wireless charging apparatus for transmitting wireless power according to the FIG. 2.
  • FIG. 8 is a circuit diagram for explaining a DC / DC converter of the wireless charging device of FIG.
  • Fig. 9 is a view showing the configuration of the wireless charging apparatus of Fig. 7 disposed on the substrate and the shielding member.
  • the present invention is not necessarily limited to the above embodiments, as long as all of the constituent elements of the embodiment are described as being combined or combined in one operation. That is, within the scope of the object of the embodiment, all of the elements may be selectively coupled to one or more of them.
  • all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware.
  • the codes and code segments constituting the computer program may be easily deduced by those skilled in the art.
  • Such a computer program may be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing embodiments.
  • a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.
  • first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements.
  • an apparatus for transmitting wireless power on a wireless power charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, , A wireless power transmitter, and a wireless charging device.
  • a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver Terminals and the like can be used in combination.
  • the wireless charging device may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power may be transmitted to the device.
  • AP access point
  • a wireless power transmitter can be used not only on a desk or on a table, but also developed for automobiles and used in a vehicle.
  • a wireless power transmitter installed in a vehicle can be provided in a form of a stand that can be easily and stably fixed and mounted.
  • a wireless power receiver according to another embodiment may also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.
  • a wireless power receiver may include at least one wireless power transmission scheme.
  • the wireless power transmission scheme may include at least one of the electromagnetic induction scheme, the electromagnetic resonance scheme, and the RF wireless power transmission scheme.
  • a wireless power transmitter and a wireless power receiver that constitute a wireless power system can exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication.
  • the in-band communication and the BLE communication can be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, and the like.
  • the wireless power receiver can transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching on / off the current induced through the reception coil in a predetermined pattern.
  • the information transmitted by the wireless power receiver may include various status information including received power intensity information.
  • the wireless power transmitter can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.
  • FIG. 1 is a block diagram for explaining a wireless charging system according to an embodiment
  • FIG. 3 is a circuit diagram for explaining a detecting unit of the wireless charging apparatus of FIG. 2
  • FIG. 4 is a circuit diagram for explaining the operation of the detecting unit of FIG.
  • Fig. 5 is a circuit diagram for explaining the operation of the detection unit of Fig.
  • the wireless charging system includes a wireless power transmitter 10 for transmitting power wirelessly, a wireless power receiver 20 for receiving the transmitted power, and an electric device 30 Lt; / RTI >
  • the wireless power receiving terminal 20 may perform in-band communication in which information is provided to the wireless power transmitting terminal 10 using the same frequency band as the operating frequency used for wireless power transmission.
  • the wireless power receiving terminal 20 may perform an out-of-band communication that provides information to the wireless power transmitting terminal 10 using a separate frequency band different from the operating frequency used for the wireless power transmission .
  • the information that the wireless power receiving terminal 20 provides to the wireless power transmitting terminal 10 may include not only status information of the wireless power receiving terminal 20 but also control information.
  • the in-band communication and the out-of-band communication may provide unidirectional communication, but the present invention is not limited thereto.
  • the in-band communication and the out-of-band communication may provide half-duplex communication or bidirectional communication.
  • the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the wireless power transmitting terminal 10 is not limited to the wireless power receiving terminal 20 It may be to transmit information.
  • the half duplex communication mode bidirectional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted only by any one device at any time.
  • the wireless power receiving terminal 20 may acquire various status information of the electric device 30.
  • the state information of the electric device 30 may include current electric power consumption information battery charge state information, battery output voltage / electric current information, and the like, but is not limited thereto, and may be acquired from the electric device 30, Information that can be used for wireless power control suffices.
  • the wireless charging system can provide high power wireless power from the wireless power transmitting terminal 10 to the wireless power receiving terminal 20.
  • the high power wireless power may have a power of at least a predetermined intensity.
  • a high power wireless power may have a power of 15 W or more.
  • the high power wireless power may be between 15W and 100W.
  • the high power radio power may be 60 W of power.
  • FIG. 2 is a block diagram illustrating a wireless charging apparatus for transmitting wireless power according to an embodiment.
  • the wireless charging apparatus 10 for transmitting wireless power may include a power supply unit 110.
  • the power supply unit 110 may receive the AC power from the external power terminal and transmit the AC power to the filter unit 120.
  • the wireless charging device 10 for transmitting wireless power may include a filter unit 120.
  • the filter unit 120 removes electromagnetic interference (EMI) and surge voltage leaking along the input AC power, and outputs it to the rectifying unit 130.
  • EMI electromagnetic interference
  • the wireless charging apparatus 10 for transmitting wireless power may include a rectifying unit 130.
  • the rectifying unit 130 rectifies the AC power inputted through the power supply unit 110.
  • the rectifying section 130 may be composed of a full-bridge diode.
  • the rectifying unit 130 rectifies the commercial AC power input through the power supply unit 110 to the DC power.
  • the rectifying unit 130 may provide the rectified DC voltage Vdc to the transformer 140 and the rail voltage switch SW.
  • the rectified DC voltage Vdc may be of sufficiently high voltage to produce high power radio power.
  • the direct current voltage Vdc may be 310V.
  • the wireless charging device 10, which transmits wireless power according to one embodiment, may include a transformer 140.
  • the transforming unit 140 transforms the DC voltage Vdc inputted through the rectifying unit 130 to a predetermined voltage required for the operation of each configuration of the wireless charging apparatus and provides a predetermined voltage transformed to each configuration .
  • the transforming unit 140 may provide the rail voltage controller 150 with the 1-1 voltage V11 obtained by transforming the rectified DC voltage Vdc.
  • the transforming unit 140 may provide the first-second voltage V12 that transformed the rectified DC voltage Vdc.
  • the 1-2 voltage (V12) may be 5V, but is not limited thereto.
  • the transforming unit 140 may provide the gate driver 170 with the first-third voltage V13 obtained by transforming the rectified DC voltage Vdc.
  • the first-third voltage V13 may be 12V, but is not limited thereto.
  • the transformer 140 can provide power required for each configuration in addition to the first-first voltage V11, the first-second voltage V12, and the first-third voltage 13, It is not limited to Fig.
  • the wireless charging device 10 for transmitting wireless power may include a rail voltage controller 150.
  • the rail voltage controller 150 can control the rail voltage switch SW based on the 1-1 voltage V11 provided by the transformer 140.
  • the rail voltage control unit 150 turns off the rail voltage switch SW in a ping mode for detecting the presence or absence of a wireless charging device that receives wireless power or detecting a foreign substance, (Vdc) is not provided to the first node (N1) which is the rail voltage terminal.
  • Vdc the DC voltage Vdc, which is a high voltage, is not applied to the rail voltage terminal, so that standby power can be reduced and damage to peripheral electronic devices can be prevented.
  • the rail voltage controller 150 turns on the rail voltage switch SW in the power transmission mode in which wireless charging proceeds and provides the DC voltage Vdc as a high voltage to the first node N1 at the rail voltage terminal .
  • high-voltage DC voltage (Vdc) is applied to the rail voltage terminal, high power wireless power can be generated.
  • the rail voltage control unit 150 may operate based on a mode control signal indicating a ping mode or a power transmission mode of the main control unit 160.
  • the wireless charging apparatus 10 for transmitting wireless power may include a voltage distribution unit 230.
  • the voltage distributor 230 distributes the voltage 1-2 of the 1-2 voltage provided from the transformer 140 to provide the 2-1 voltage V21 to the main controller 160 and supplies the 2-1 voltage V21 to the voltage controller 240 And may provide the second -2 voltage V22.
  • the voltage divider 230 may include a first resistor R1 to a third resistor R3.
  • the voltage divider 230 divides the second-1 voltage V21, which is a voltage required for driving the main controller 160, by using the first-second voltage V12 and the first to third resistors R1 to R3.
  • a second -2 voltage (V22) which is the low voltage provided to the rail voltage end in the ping mode.
  • the wireless charging device 10 for transmitting wireless power may include a low voltage supply 240.
  • the low voltage supply 240 may provide the second voltage -2, which is the low voltage, to the first node N1 which is the rail voltage terminal.
  • the undervoltage may be a voltage intensity sufficient to generate a ping signal in the ping mode.
  • the low voltage may be between 2V and 3V.
  • the low voltage supply 240 may include a first diode D1.
  • the first diode D1 may be disposed in a reverse direction to the first node N1. That is, the first diode D1 may prevent the high voltage of the rail voltage terminal from being applied to the transformer 140 or the main controller 160 in the power transmission step, even though the low voltage is provided to the rail voltage terminal in the ping mode .
  • the wireless charging apparatus 10 for transmitting wireless power may include a sensing unit 200.
  • the sensing unit 200 may measure the voltage and current of the first node N1 which is the rail voltage terminal. More specifically, the sensing unit 200 may include a voltage sensor (not shown) and a current sensor (not shown).
  • the voltage sensor (not shown) may measure the voltage of the first node N1 and provide the measured rail voltage Vrail to the main control unit 160.
  • the current sensor (not shown) may measure the current flowing from the first node N1 to the input terminal of the inverter 180 and may provide the measured rail current Irail to the main controller 160.
  • the main control unit 160 can detect the power value using the measured rail voltage Vrail and the rail current Irail. That is, in the case of high-power wireless charging, a sophisticated power detection is required. In the wireless charging apparatus according to an embodiment of the present invention, a voltage measurement value and a current measurement value It is possible to use sophisticated power detection.
  • the wireless charging device 10 for transmitting wireless power may include an inverter 180.
  • the inverter 180 may include a plurality of switches to convert DC power to AC power.
  • the inverter 180 may be configured to include a half bridge circuit as shown in FIG. 2. However, the inverter 180 may include a full bridge circuit.
  • the inverter 180 not only converts direct current power into alternating current power but also can change the intensity of the alternating current power.
  • the wireless charging device 10, which transmits wireless power according to one embodiment, may include a gate driver 170.
  • the gate driver 170 is driven by the first to third voltage V13 provided at the transformer 140 and can control the switch provided in the inverter 180 based on the pulse width modulation signal.
  • the gate driver 170 may receive at least one pulse width modulated signal from the main control unit 160 and may control the switch of the inverter 180 according to the received pulse width modulated signal.
  • the gate driver 170 may be configured as a feedback circuit (not shown). Stability is very important for generating high power wireless power.
  • the gate driver 170 may be constituted as a feedback circuit to increase stability.
  • the main control section 160 may be constituted by a feedback circuit (not shown).
  • the main control unit 160 controls the duty cycle of the pulse width modulated signal, that is, the duty rate and the phase to control the intensity and the operating frequency of the output power of the inverter 180 have.
  • the main control unit 160 may adaptively control the duty cycle and the phase of the pulse width modulation signal based on the feedback signal received from the wireless power receiving apparatus. For example, the main control unit 160 may control the duty cycle and phase of the pulse width modulation signal so as to generate output power at a predetermined operating frequency required by the wireless power receiving apparatus.
  • the predetermined operating frequency may be a frequency at which the wireless charging device 20 can stably receive the wireless power when wirelessly charging with high power.
  • the predetermined operating frequency can constitute the upper and lower limits.
  • the upper limit value of the predetermined operating frequency may be a frequency harmful to the human body or lower than the frequency of the frequency of the broadcasting station.
  • the lower limit of the predetermined operating frequency may be a frequency value higher than the resonance point of the circuit. If the resonance point of the circuit and the operating frequency are the same, the circuit can be destroyed.
  • the predetermined operating frequency may be 135 kHz to 150 kHz.
  • the predetermined operating frequency may be 145 KHz.
  • the main control unit 160 may fix the operating frequency according to the request of the wireless power receiving apparatus. By fixing the operating frequency, high power wireless charging can be stabilized. If the operating frequency fluctuates, it can be the same as the resonance point of the circuit, so it is stable that the operating frequency is fixed.
  • the wireless charging device 10 for transmitting wireless power may include a transmitter 190.
  • the transmitting unit 190 may include a transmitting coil 191 and a resonant capacitor 192. More specifically, the transmitting coil 191 may be configured with a receiving coil of a wireless charging device that receives wireless power and a predetermined turn ratio.
  • the number of turns of the transmission coil 191 may be 10 times or less the number of turns of the reception coil.
  • the turn ratio of the transmitting coil 191 to the receiving coil may be 10/1 or less.
  • the number of turns of the transmitting coil 191 may be 40, and the number of turns of the receiving coil may be 6.
  • the resonant capacitor 192 may be a capacitance for constituting a resonant circuit depending on the inductance of the transmitting coil 191.
  • the resonant capacitor 192 may be 6.6 nF.
  • the receiving part of the wireless charging device that receives the wireless power may have a receiving coil of 8.8 ⁇ H consisting of six turns and a resonant capacitor of 236 nF. That is, the transmitting unit of the wireless charging device that transmits the wireless power and the receiving unit of the wireless charging device that receives the wireless power resonate with each other, thereby increasing the wireless charging efficiency.
  • the wireless charging device 10 for transmitting wireless power may include a demodulation unit 210.
  • the demodulation unit 210 may demodulate the detected signal and transmit the demodulated signal to the main control unit 160 when a signal received through the transmission coil 191 is detected.
  • the demodulated signal includes an operating frequency value, a received power value, a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC) An over-current / over-temperature indicator, and the like.
  • EC error correction
  • EOC end of charge indicator
  • the present invention is not limited thereto, and various status information for identifying the status of the wireless power receiver may be included.
  • the wireless power transmitter 10 may acquire the signal strength indicator through in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.
  • the wireless power transmitter 10 and the wireless power receiver perform in-band communication.
  • the wireless power transmitter 10 and the wireless power receiver use only the frequency band Directional communication through different frequency bands.
  • the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.
  • the wireless charging device 10 for transmitting wireless power may include a detection unit 220.
  • the detection unit 220 may generate a comparison signal based on the rail voltage Vrail and the transmission coil voltage Vant and provide the generated comparison signal to the main control unit 160.
  • the main control unit 160 may determine whether a wireless charging device that receives wireless power exists in the charging area based on the comparison signal provided by the detection unit 220.
  • High-power wireless charging systems require very high power consumption and can affect nearby electronic devices, so wireless charging should proceed when the receiver is located at the transmitter.
  • the main control unit 160 may detect a foreign object based on the comparison signal provided by the detection unit 220.
  • the main control unit 160 may determine whether the charging distance is increased by moving the receiver away from the charging area based on the comparison signal provided by the detector 220. [ Accordingly, the wireless charging system can increase the charging efficiency by separating the case where the foreign substance exists and the case where the charging distance is increased.
  • the detector 220 may include a first comparator 221, a second comparator 222, a distribution resistor 224, and a mode switch 223.
  • the mode switch 223 can be controlled based on the mode switch control signal cont provided by the main control unit 160. [ More specifically, the mode switch 223 may have one end connected to the other end of the fifth resistor R5 and the other end connected to the ground. Mode switch 223 may be turned off in the ping mode and turned on in the power transfer mode.
  • the first comparing unit 221 may generate the first comparison signal comp1 based on the first reference voltage Vref1 and the transmission coil voltage Vant and provide the first comparison signal comp1 to the main control unit 160.
  • the first comparator 221 may be a first comparator Amp1.
  • the first comparator Amp1 may be an OP-Amp.
  • the first comparator Amp1 may receive the first reference voltage Vref1 at the non-inverting terminal and the transmitting coil voltage Vant at the inverting terminal.
  • the second comparing unit 222 may generate the second comparison signal comp2 based on the second reference voltage Vref2 and the transmission coil voltage Vant and provide the second comparison signal comp2 to the main control unit 160.
  • the second comparator 222 may be the second comparator Amp2.
  • the second comparator Amp2 may be an OP-Amp.
  • the second comparator Amp2 may receive the second reference voltage Vref2 at the non-inverting terminal and the transmitting coil voltage Vant at the inverting terminal.
  • the distribution resistance unit 224 may receive the rail voltage Vrail and provide the divided voltage to the first reference voltage Vref1 according to the operation of the mode switch 223.
  • the distribution resistance portion 224 may include a fourth resistor R4 and a fifth resistor R5.
  • the fourth resistor R4 may be connected at one end to the rail voltage Vrail and the other end to the non-inverting terminal of the first comparator Amp1 and to one end of the fifth resistor R5.
  • the other end of the fifth resistor R5 may be connected to one end of the mode switch 223.
  • FIG. 4 is a diagram illustrating a method by which the detector 220 generates the first comparison signal comp1 and the second comparison signal comp2 in the ping mode.
  • the rail voltage switch SW is turned off and the low voltage provided by the low voltage supplier 240 is input to the rail voltage Vrail.
  • the rail voltage Vrail does not need to be reduced because the voltage level is sufficiently low.
  • the mode switch 223 is turned off, the distribution resistance section 224 does not decrease the rail voltage Vrail because the current does not flow through the non-inverting terminal of the comparator Amp1 and the fifth resistor R5, And can be provided as the reference voltage Vref1.
  • the rail voltage Vrail having the low voltage may be the first reference voltage Vref1.
  • the first reference voltage Vref1 in the ping mode may be 2V to 3V.
  • the first comparator 221 can generate the first comparison signal comp1 of high level if the transmission coil voltage Vant is smaller than the first reference voltage Vref1.
  • the first comparator 221 can generate the first comparison signal comp1 of low level if the transmission coil voltage Vant is larger than the first reference voltage Vref1.
  • the second reference voltage Vref2 may be generated in the transformer 140. [
  • the second reference voltage Vref2 may be greater than the first reference voltage Vref1.
  • the second reference voltage Vref2 may be 5V.
  • the second comparator 222 can generate the second comparison signal comp2 of high level if the transmission coil voltage Vant is smaller than the second reference voltage Vref2.
  • the second comparator 222 can generate the second comparison signal comp2 of low level if the transmission coil voltage Vant is larger than the second reference voltage Vref2.
  • the main control unit 160 can determine that the wireless charging device that receives the wireless power exists in the charging area if the first comparison signal comp1 is high level and the second comparison signal comp2 is high level have. In this case, the main control unit 160 may change from the ping mode to the power transmission mode and proceed with high power wireless charging. The main control unit 160 may determine that a foreign object is detected when the first comparison signal comp1 is low level and the second comparison signal comp2 is low level. In this case, the main control unit 160 can stop wireless charging. Therefore, the wireless charging apparatus according to the embodiment can efficiently perform wireless charging, improve the heat generation phenomenon, and prevent unnecessary power consumption.
  • FIG. 5 illustrates a method of generating the first comparison signal Comp1 and the second comparison signal Comp2 in the power transmission mode.
  • the rail voltage switch sw is turned on and the high voltage DC voltage Vdc is input to the rail voltage levell.
  • the rail voltage Vrail has a high voltage level, it is necessary to reduce the voltage level.
  • the mode switch 223 is turned on, the fifth resistor R5 is connected to the ground, and therefore, the distribution resistor 224 is turned on by the voltage distribution of the fourth resistor R4 and the fifth resistor R5, The voltage level of the voltage Vray may be reduced to provide the first reference voltage Vref1.
  • the first reference voltage Vref1 in the power transmission mode may be lower in voltage level than the first reference voltage Vref1 in the ping mode.
  • the first reference voltage Vref1 in the power transfer mode may be between 1V and 2V.
  • the first comparator 221 can generate the first comparison signal comp1 of high level if the transmission coil voltage Vant is smaller than the first reference voltage Vref1.
  • the first comparator 221 can generate the first comparison signal comp1 of low level if the transmission coil voltage Vant is larger than the first reference voltage Vref1.
  • the second reference voltage Vref2 may be generated in the transformer 140. [
  • the second reference voltage Vref2 may be greater than the first reference voltage Vref1.
  • the second reference voltage Vref2 may be 5V.
  • the second comparator 222 can generate the second comparison signal comp2 of high level if the transmission coil voltage Vant is smaller than the second reference voltage Vref2.
  • the second comparator 222 can generate the second comparison signal comp2 of low level if the transmission coil voltage Vant is larger than the second reference voltage Vref2.
  • the main control unit 160 determines that the wireless charging apparatus that receives the wireless power exists in the fixed position of the charging region when the first comparison signal comp1 is at a high level and the second comparison signal comp2 is at a high level . In this case, the main control unit 160 can maintain high power wireless charging.
  • the main control unit 160 can determine that the charging distance is increased when the first comparison signal comp1 is at the low level and the second comparison signal comp2 is at the high level and the receiver is away from the charging region. In this case, the main control unit 160 can adjust the intensity of the wireless power without interrupting wireless charging. The main control unit 160 may determine that the foreign matter is detected or the non-signal is not present in the charging area if the first comparison signal comp1 is low level and the second comparison signal comp2 is low level. In this case, the main control unit 160 can stop wireless charging. Therefore, the wireless charging apparatus according to the embodiment can efficiently perform wireless charging, improve the heat generation phenomenon, and prevent unnecessary power consumption.
  • Fig. 6 is a view showing the arrangement of the wireless charging device of Fig. 2 disposed on the substrate and the shielding member.
  • a wireless charging apparatus 10 for transmitting wireless power may include a substrate 11, a shielding material 12, and the like.
  • the configuration of the wireless charging device 10 excluding the power supply part 110 and the transmission coil 191 may be arranged on the substrate 11.
  • the substrate 11 may be a printed circuit board.
  • the substrate 11 may support rigidly arranged arrangements.
  • the substrate 11 may have a four-layer structure.
  • the substrate 11 may be 1.6T thick.
  • the substrate 11 may have a rectangular shape. In this case, the length d2 of the major axis of the substrate 11 may be 1500 mm and the length d1 of the minor axis may be 1150 mm.
  • the thickness of the substrate module including the substrate 11 and the arrangement disposed on the substrate 11 may be within 22 mm.
  • AC input may be input to one side of the substrate 11 (AC Input).
  • the shielding member 12 may be provided with a transmission coil 191 on its upper surface.
  • the shielding member 12 can guide the wireless power generated in the transmission coil 191 in the charging direction.
  • the shielding member 12 may have a circular shape.
  • the diameter d3 of the shielding member 12 may be 90 mm.
  • the shielding material 12 may be 5.2T thick.
  • FIG. 7 is a block diagram for explaining a wireless charging apparatus for receiving wireless power interworking with a wireless charging apparatus for transmitting wireless power according to the FIG. 2, and
  • FIG. 8 is a block diagram for explaining a DC / Fig.
  • the wireless charging apparatus 20 for receiving wireless power may include a receiving unit 310.
  • the receiving unit 310 may include a receiving coil 311 and a resonant capacitor 312.
  • the receiving unit 310 may transmit the AC power received through the receiving coil 311 to the rectifying unit 32.
  • the receiving coil 311 may be configured with a transmitting coil of a wireless charging device that transmits wireless power and a predetermined turn ratio.
  • the number of turns of the receiving coil 311 may be 1/10 or more times the number of turns of the transmitting coil.
  • the turn ratio of the receiving coil 311 with respect to the transmitting coil may be 1/10 or more.
  • the number of turns of the receiving coil 311 may be six turns, and the number of turns of the transmitting coil may be 40 turns.
  • the turn ratio of the transmission coil to the reception coil gradually increases to lower the voltage input to the reception coil side for stability, and the charging efficiency decreases and the degree of freedom of charging decreases. Since the wireless charging system according to the embodiment is capable of precise and quick feedback even when the wireless charging is performed with a high output power and is stable, the turn ratio of the transmission coil relative to the reception coil can be lower than that of the prior art, Thereby increasing the charging efficiency and increasing the charging degree of freedom.
  • the resonance capacitor 312 may be a capacitance for forming a resonance circuit according to the inductance of the receiving coil 311.
  • the receiving coil 311 composed of six turns is 8.8 ⁇ H
  • the resonant capacitor 312 may be 235 nF.
  • the transmitter of the wireless charging device that transmits the wireless power may have 330 ⁇ ⁇ of the transmission coil composed of 40 turns and the resonant capacitor may be 6.6 nF. That is, the receiver of the wireless charging device that receives the wireless power and the transmitter of the wireless charging device that transmits the wireless power resonate with each other, and the wireless charging efficiency may increase.
  • the wireless charging device 20 for receiving wireless power may include a rectifier 320.
  • the rectifying unit 320 rectifies the AC power input through the receiving unit 310.
  • the rectification part 320 may be a full-bridge diode. That is, the rectifying unit 320 may convert AC power to DC power and transmit the DC power to the smoothing unit 330.
  • the wireless charging device 20, which receives wireless power according to one embodiment, may include a smoothing unit 330.
  • the smoothing unit 330 may remove the ripple component of the DC voltage supplied from the rectification unit 320 and provide the DC / DC converter 340 with the ripple component.
  • the smoothing unit 330 may include a smoothing capacitor C3.
  • the wireless charging device 20, which receives wireless power according to one embodiment, may include a DC / DC converter 340.
  • the DC / DC converter 340 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 30 and then deliver it to the load 30.
  • the DC / DC converter 340 may be a step down converter.
  • a wireless charging device 20 that receives wireless power in accordance with one embodiment may experience flow during charging due to its high degree of charging freedom. If flow occurs, input voltage instability or overvoltage may occur.
  • DC / DC converter 340 may be configured as a step-down converter to stabilize unstable voltage and protect the load from overvoltage. As an example, as shown in FIG. 8, the step-down converter may be a buck converter.
  • the DC / DC converter 340 may include a third inductor L3, a second diode D2, and a fourth capacitor C4.
  • One end of the third inductor L3 may be connected to one end of the smoothing unit 330 and the second diode may be connected in the reverse direction.
  • the other end of the third inductor L3 may be connected to one end of the fourth capacitor C4 and may be connected to the load side.
  • the DC / DC converter 340 receives the DC voltage output from the rectification unit 320 or the smoothed DC voltage V1 by the smoothing unit 330 and outputs the DC voltage V1 as a specific voltage V2 required by the load 30 can do.
  • the wireless charging device 20, which receives wireless power according to one embodiment, may include a sensing portion 370.
  • the sensing unit 370 can measure the voltage and current at the DC voltage input terminal of the load 30.
  • the sensing unit 370 may include a voltage sensor (not shown) and a current sensor (not shown).
  • the voltage sensor (not shown) may measure the voltage at the DC voltage input terminal of the load 30 and provide the measured voltage value to the main controller 350.
  • the current sensor (not shown) may measure the current at the DC voltage input terminal of the load 30 and provide the measured current value to the main controller 350.
  • the main control unit 350 can detect the power value using the measured voltage value and current value. That is, in the case of high-power wireless charging, a sophisticated power detection is required. In the wireless charging apparatus according to an embodiment of the present invention, a voltage measurement value and a current measurement value It is possible to use sophisticated power detection.
  • the main control unit 350 may determine whether an overvoltage is generated by comparing the measured power input to the load input terminal with a predetermined reference value. As a result of the determination, if an overvoltage occurs, a predetermined packet indicating that the overvoltage has occurred can be generated and transmitted to the modulating unit 360.
  • the signal modulated by the modulating unit 360 may be transmitted to the wireless power transmitter through the receiving coil 311 or a separate coil (not shown).
  • the wireless charging device 20, which receives wireless power according to one embodiment, may include a modulator 360.
  • the modulation unit 360 may modulate the control signal generated by the main control unit 350 and transmit the modulated control signal to the reception coil 311.
  • the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.
  • FSK frequency shift keying
  • PSK phase shift keying
  • the main control unit 350 may request the wireless power transmitter to transmit the wireless power by fixing the wireless power to a predetermined operating frequency.
  • the predetermined operating frequency may be a frequency at which the wireless charging device 20 can stably receive the wireless power when wirelessly charging with high power.
  • the predetermined operating frequency can constitute the upper and lower limits.
  • the upper limit value of the predetermined operating frequency may be a frequency harmful to the human body or lower than the frequency of the frequency of the broadcasting station.
  • the lower limit of the predetermined operating frequency may be a frequency value higher than the resonance point of the circuit. If the resonance point of the circuit and the operating frequency are the same, the circuit can be destroyed.
  • the predetermined operating frequency may be 135 kHz to 150 kHz.
  • the predetermined operating frequency may be 145 KHz.
  • the main control unit 350 may request the predetermined operating frequency.
  • the main control unit 350 may provide the modulating unit 360 with a signal including a predetermined operating frequency value. By fixing the operating frequency, high power wireless charging can be stabilized. If the operating frequency fluctuates, it can be the same as the resonance point of the circuit, so it is stable that the operating frequency is fixed.
  • Fig. 9 is a view showing the configuration of the wireless charging apparatus of Fig. 7 disposed on the substrate and the shielding member.
  • a wireless charging device 20 for receiving wireless power may include a substrate 21, a shielding material 22, and the like.
  • the configuration of the wireless charging device 20 excluding the load 30 and the receiving coil 311 may be arranged on the substrate 21.
  • the substrate 21 may be a printed circuit board.
  • the substrate 21 may support rigidly arranged configurations.
  • the substrate 21 may be a four-layer structure.
  • the substrate 21 may be 1.6T thick.
  • the substrate 21 may have a square shape.
  • the horizontal length d4 of the substrate 21 may be 850 mm and the vertical length d5 may be 850 mm.
  • the area of the substrate 21 of the wireless charging device 20 that receives the wireless power may be smaller than the area of the substrate of the wireless charging device that transmits the wireless power.
  • the thickness of the substrate module including the substrate 21 and the arrangement disposed on the substrate 21 may be within 6.5 mm.
  • the substrate 21 can output DC power to one side (DC Output).
  • the output DC power can be input to the load 30.
  • the shielding member 22 may have a receiving coil 311 disposed on its upper surface.
  • the shielding member 22 can guide the received radio power to the receiving coil 311. [
  • the shielding member 22 may have a circular shape. In this case, the diameter 63 of the shielding member 22 may be 90 mm.
  • the shielding material 22 of the wireless charging device 20 that receives wireless power may have the same area as the shielding material of the wireless charging device that transmits wireless power. In one example, the shielding material 22 may be 5.2T thick.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne une technologie de transmission d'énergie sans fil et, plus particulièrement, un procédé de charge sans fil, ainsi qu'un dispositif et un système de charge sans fil. Un dispositif de charge sans fil pour transmettre sans fil une puissance de sortie élevée à un récepteur d'énergie sans fil selon un mode de réalisation peut comprendre: un onduleur pour convertir une entrée de tension de courant continu pour un premier noeud en une tension de courant alternatif; une unité de transmission qui comprend un condensateur de résonance et une bobine de transmission, et auquel la tension de courant alternatif est appliquée; une unité de démodulation pour démoduler un signal dans la bande modulé reçu en provenance du récepteur d'énergie sans fil; une unité de détection pour mesurer un courant de rail et une tension de rail du premier noeud; et une unité de commande principale, l'unité de commande principale détectant une puissance de sortie sur la base de la tension de rail mesurée et du courant de rail, et le nombre de spires de la bobine de transmission est égal ou inférieur à 10 fois le nombre de spires d'une bobine de réception du récepteur d'énergie sans fil.
PCT/KR2018/012689 2017-11-30 2018-10-25 Dispositif et système de charge sans fil WO2019107748A1 (fr)

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KR10-2017-0163099 2017-11-30
KR1020170163099A KR20190063930A (ko) 2017-11-30 2017-11-30 무선 충전 장치 및 시스템

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WO2024035139A1 (fr) * 2022-08-11 2024-02-15 삼성전자 주식회사 Dispositif électronique et procédé de prise en charge d'une recharge sans fil à l'aide d'une structure de commutation parallèle

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