WO2017138713A1 - 복수의 송신 코일이 구비된 무선 전력 기기 및 그 구동 방법 - Google Patents
복수의 송신 코일이 구비된 무선 전력 기기 및 그 구동 방법 Download PDFInfo
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- WO2017138713A1 WO2017138713A1 PCT/KR2017/001109 KR2017001109W WO2017138713A1 WO 2017138713 A1 WO2017138713 A1 WO 2017138713A1 KR 2017001109 W KR2017001109 W KR 2017001109W WO 2017138713 A1 WO2017138713 A1 WO 2017138713A1
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- wireless power
- signal
- transmission
- receiver
- coils
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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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
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
Definitions
- the present invention relates to a wireless power transmission technology, and more particularly, to a wireless power device having a plurality of transmission coils and a driving method thereof.
- Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as radio waves, lasers, high frequencies, and microwaves. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.
- energy transmission using wireless may be classified into magnetic induction, electromagnetic resonance, and RF transmission using short wavelength radio frequency.
- the magnetic induction method uses the phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows to one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Magnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).
- the magnetic resonance method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Since the magnetic resonance method is hardly affected by the electromagnetic wave problem, it has the advantage of being safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.
- the short wavelength wireless power transmission scheme implies, the RF transmission scheme— takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWave.
- This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power.
- the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.
- Wireless power transfer technology can be used in various industries, such as the mobile, IT, railroad and consumer electronics industries.
- a wireless power transmitter equipped with a plurality of coils has been released.
- a conventional wireless power transmitter equipped with a plurality of coils sequentially detects a sensing signal through each transmitting coil to detect the presence of a wireless power receiver, for example, a ping signal used in an electromagnetic induction method, an electromagnetic resonance method. Beacon signal used for, etc.-sent out.
- a conventional wireless power transmitter equipped with a plurality of transmission coils reduces the detection error of the wireless power receiver and sequentially detects the detection signal a predetermined number of times, for example, 2 to determine which transmission coil has good charging efficiency. It was controlled to send out through each transmission coil repeatedly.
- the present invention has been devised to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a wireless power device having a plurality of transmission coils and a driving method thereof.
- Another object of the present invention is to provide a wireless power transmitter having a plurality of transmission coils and a driving method thereof capable of increasing a recognition rate for a wireless power receiver and minimizing time required for recognition.
- Another object of the present invention is to provide a wireless power transmitter and a method of driving the same having a plurality of transmission coils for increasing charging efficiency when the function of the wireless power receiver is deteriorated.
- Another object of the present invention is to provide a wireless power transmitter and a driving method thereof, which enable wireless charging when wireless charging is not performed according to the alignment of the wireless power receiver.
- a wireless power transmitter including a plurality of transmitting coils may include first to Nth coils; And transmitting a first sensing signal to the wireless power receiver through the first to Nth coils, and receiving a first signal strength indicator corresponding to the first sensing signal, and receiving the signal strength of the received first signal strength indicator. And a control unit configured to adjust a transmission order of the first to N-th coils for transmitting the second sensing signal, wherein the controller is configured to adjust the second sensing signal to the first to Nth based on the adjusted transmission order.
- the coil can be transmitted to the receiver.
- a wireless power transmitter having a plurality of transmission coils for increasing charging efficiency and a driving method thereof may be provided, thereby improving device efficiency and user convenience.
- a wireless power transmitter and a driving method for enabling wireless charging may be provided, thereby improving device efficiency and user convenience.
- FIG. 1 is a schematic diagram illustrating a sensing signal transmission procedure between a wireless power transmitter and a wireless power receiver having a multi-coil according to an embodiment.
- FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
- 3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.
- FIG. 4 is a block diagram illustrating a structure of a multi-coil wireless power transmitter according to an embodiment.
- FIG. 5 is a block diagram of a wireless power receiver interworking with a multi-coil wireless power transmitter according to an embodiment.
- FIG. 6 is a view for explaining a wireless power reception procedure defined in the WPC standard.
- FIG. 7 is a diagram illustrating a case where a state transition does not occur from the ping step of the prior art to the identification step.
- FIGS. 8 and 9 are diagrams illustrating that a wireless power transmission system enters an identification step by changing a transmission order of sensing signal transmission of a multi-coil according to an embodiment.
- FIG. 10 is a graph illustrating a change in current value of a wireless power receiver according to an operation of a wireless power transmitter for transmitting a detection signal.
- 11 is a flowchart illustrating a method of driving a wireless power transmission system for changing a transmission order of sensing signals for each coil according to an exemplary embodiment.
- FIG. 12 is a diagram illustrating a method of driving a wireless power system when receiving a signal strength indicator according to an embodiment through a plurality of coils.
- a wireless power transmitter including a plurality of transmitting coils may include first to Nth coils; And transmitting a first sensing signal to the wireless power receiver through the first to Nth coils, and receiving a first signal strength indicator corresponding to the first sensing signal, and receiving the signal strength of the received first signal strength indicator. And a control unit configured to adjust a transmission order of the first to N-th coils for transmitting the second sensing signal, wherein the controller is configured to adjust the second sensing signal to the first to Nth based on the adjusted transmission order.
- the coil can be transmitted to the receiver.
- the top (bottom) or the bottom (bottom) is the two components are in direct contact with each other or One or more other components are all included disposed between the two components.
- up (up) or down (down) may include the meaning of the down direction as well as the up direction based on one component.
- the apparatus for transmitting wireless power on the wireless power system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably.
- a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, a receiver, a receiver Or the like can be used in combination.
- the transmitter according to the present invention may be configured in a pad form, a cradle form, an access point (AP) form, a small base station form, a stand form, a ceiling buried form, a wall hanging form, and the like. You can also transfer power.
- the transmitter may comprise at least one wireless power transmission means.
- the wireless power transmission means may use various wireless power transmission standards based on an electromagnetic induction method that generates a magnetic field in the power transmitter coil and charges using the electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field.
- the wireless power transmission means may include a wireless charging technology of the electromagnetic induction method defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA) which is a wireless charging technology standard apparatus.
- WPC Wireless Power Consortium
- PMA Power Matters Alliance
- the receiver according to an embodiment of the present invention may be provided with at least one wireless power receiving means, and may simultaneously receive wireless power from two or more transmitters.
- the wireless power receiving means may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA), which are wireless charging technology standard organizations.
- WPC Wireless Power Consortium
- PMA Power Matters Alliance
- the receiver according to the present invention is a mobile phone, smart phone, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in a small electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, a wearable device such as a smart watch, but is not limited thereto. If the device is equipped with a wireless power receiver according to the present invention, the battery can be charged. It is enough.
- FIG. 1 is a schematic diagram illustrating a sensing signal transmission procedure between a wireless power transmitter and a wireless power receiver having a multi-coil according to an embodiment.
- the wireless power transmitter may include a plurality of transmission coils, which will be described on the assumption that the wireless power transmitter has three transmission coils 111, 112, and 113. Each of the transmission coils 111, 112, and 113 may overlap some other regions with other transmission coils, and the wireless power transmitter may detect the presence of a predetermined detection signal 117 to detect the presence of the wireless power receiver through each transmission coil. 127 (eg, a digital ping signal) may be sequentially transmitted to the outside in a predefined order.
- the wireless power transmitter may repeat the sensing signal transmission in one or more sets. Here, it is assumed that the wireless power transmitter performs the first detection signal transmission procedure and the second detection signal transmission procedure, but this is only one embodiment.
- the wireless power transmitter sequentially transmits the detection signal 117 through the primary detection signal transmission procedure shown in FIG. 110, and transmits a signal strength indicator or signal strength indicator 116 from the wireless power receiver 115. Can identify the received transmission coils 111 and 112. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in FIG. 120, and transmits power among the transmission coils 111 and 112 where the signal strength indicator 126 is received. A transmission coil having good efficiency or charging efficiency is identified, and power is sent through the identified transmission coil.
- the reason why the wireless power transmitter performs two sensing signal transmission procedures is to more accurately identify which transmitting coil is well aligned with the receiving coil of the wireless power receiver.
- the number of times may be increased or decreased at implementation.
- the wireless power transmitter Based on the signal strength indicator 126 received at each of the first transmitting coil 111 and the second transmitting coil 112 selects the best-aligned transmitting coil, and performs wireless charging using the selected transmitting coil. .
- the signal strength indicators 116 and 126 may not be transmitted depending on the alignment of the transmitting coil and the receiver coil.
- FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
- power transmission from a transmitter to a receiver according to the WPC standard can be divided into a selection phase 210, a ping phase 220, an identification and configuration phase 230, It may be divided into a power transfer phase 240.
- the selection step 210 may be a step of transitioning when a specific error or a specific event is detected while starting or maintaining power transmission.
- the transmitter may monitor whether an object exists on the interface surface. If the transmitter detects that an object is placed on the interface surface, the transmitter may transition to the ping step 220 (S201).
- the transmitter transmits an analog ping signal of a very short pulse, and detects whether an object exists in an active area of the interface surface based on a change in current of a transmitting coil.
- the transmitter activates the receiver and sends a digital ping to identify whether the receiver is a receiver that is compliant with the WPC standard. If the transmitter does not receive a response signal for the digital ping (eg, signal strength indicator) from the receiver in the ping step 220, it may transition back to the selection step 210 (S202). In addition, in the ping step 220, when the transmitter receives a signal indicating that the power transmission is completed, that is, the charging completion signal, the transmitter may transition to the selection step 210 (S203).
- a response signal for the digital ping eg, signal strength indicator
- the transmitter may transition to the identification and configuration step 230 for collecting receiver identification and receiver configuration and status information (S204).
- the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, a packet transmission error, or a power transmission contract. If this is not set (no power transfer contract) it may transition to the selection step 210 (S205).
- the transmitter may transition to the power transmission step 240 for transmitting the wireless power (S206).
- the transmitter receives an unexpected packet, an outgoing desired packet for a predefined time, or a violation of a predetermined power transmission contract occurs. transfer contract violation), if the filling is completed, the transition to the selection step (210) (S207).
- the transmitter may transition to the identification and configuration step 230 (S208).
- the power transmission contract may be set based on state and characteristic information of the transmitter and the receiver.
- the transmitter state information may include information about the maximum amount of power that can be transmitted, information about the maximum number of receivers that can be accommodated, and the receiver state information may include information about required power.
- 3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard.
- power transmission from a transmitter to a receiver according to the PMA standard is divided into a standby phase (310), a digital ping phase (320), an identification phase (330), and a power transmission.
- the operation may be divided into a power transfer phase 340 and an end of charge phase 350.
- the waiting step 310 may be a step of transitioning when a specific error or a specific event is detected while performing a receiver identification procedure for power transmission or maintaining power transmission.
- specific errors and specific events will be apparent from the following description.
- the transmitter may monitor whether an object exists on a charging surface. If the transmitter detects that an object is placed on the charging surface or the RXID retry is in progress, the transmitter may transition to the digital ping step 320 (S301).
- RXID is a unique identifier assigned to a PMA compatible receiver.
- the transmitter transmits a very short pulse of analog ping, and an object is placed on the active surface of the interface surface-for example, the charging bed-based on the current change of the transmitting coil. You can detect if it exists.
- the transmitter transitioned to the digital ping step 320 sends a digital ping signal to identify whether the detected object is a PMA compatible receiver.
- the receiver may modulate the received digital ping signal according to the PMA communication protocol to transmit a predetermined response signal to the transmitter.
- the response signal may include a signal strength indicator indicating the strength of the power received by the receiver.
- the receiver may transition to the identification step 330 (S302).
- the transmitter may transition to the standby step 310.
- the Foreign Object may be a metallic object including coins, keys, and the like.
- the transmitter may transition to the waiting step 310 if the receiver identification procedure fails or the receiver identification procedure needs to be re-executed and if the receiver identification procedure has not been completed for a predefined time ( S304).
- the transmitter transitions from the identification step 330 to the power transmission step 340 to start charging (S305).
- the transmitter goes to standby step 310 if the desired signal is not received within a predetermined time (Time Out), or if the FO is detected or the voltage of the transmitting coil exceeds a predefined reference value. It may transition (S306).
- the transmitter may transition to the charging completion step 350 (S307).
- the transmitter may transition to the standby state 310 (S309).
- the transmitter may transition from the charging completion step 350 to the digital ping step 320 (S310).
- the transmitter when the transmitter receives an end of charge (EOC) request from the receiver, the transmitter may transition to the charging completion step 350 (S308 and S311).
- EOC end of charge
- FIG. 4 is a block diagram illustrating a structure of a multi-coil wireless power transmitter according to an embodiment.
- the wireless power transmitter 600 may be largely configured to include a power converter 610, a power transmitter 620, a modulator 630, a controller 640, and a sensor 650. have. It should be noted that the configuration of the wireless power transmitter 600 is not necessarily an essential configuration, and may include more or fewer components.
- the power converter 610 may convert the power into power of a predetermined intensity.
- the power converter 610 may include a DC / DC converter 611 and an amplifier 613.
- the DC / DC converter 611 may perform a function of converting DC power supplied from the power supply unit 650 into DC power of a specific intensity according to a control signal of the controller 640.
- the controller 640 may adaptively block power supply from the power supply unit 650 or block power from being supplied to the amplifier 613 based on the voltage / current value measured by the power sensor 612. To this end, one side of the power converter 610 may be further provided with a predetermined power cut-off circuit for cutting off the power supplied from the power supply 650, or cut off the power supplied to the amplifier 613.
- the amplifier 613 may adjust the intensity of the DC / DC converted power according to the control signal of the controller 640.
- the controller 640 may receive the predetermined power control signal generated by the wireless power receiver through the demodulator 631, and may adjust the amplification factor of the amplifier 613 according to the received power control signal.
- the power transmitter 620 may include a switch 621, a carrier generator 622, and a transmission coil 623.
- the carrier generator 622 may generate an AC power having an AC component inserted into an output DC power of the amplifier 613 received through the switch 621, and transmit the generated AC power to a corresponding transmission coil. At this time, the frequency of the AC power delivered to each transmission coil may be different from each other.
- the power transmitter 620 may include a switch 621 and first to n th transmission coils 622 for controlling the output power of the amplifier 613 to be transmitted to the transmission coil.
- the controller 640 may control the switch 621 to simultaneously transmit the sensing signal through the first to nth transmitting coils 622 during the first sensing signal transmission procedure.
- the controller 640 may identify a time point at which the detection signal is transmitted through a detection signal transmission timer (not shown).
- the control unit 640 controls the switch 621 to detect the corresponding transmission coil. It can be controlled to send out a signal.
- control unit 640 is a predetermined transmission coil identifier for identifying which transmission coil was received from the demodulator 631 via the transmission coil during the first detection signal transmission procedure and the signal strength received through the transmission coil It can receive an indicator. Subsequently, in the second detection signal transmission procedure, the control unit 640 may control the switch 621 such that the detection signal may be transmitted only through the transmission coil (s) in which the signal strength indicator is received during the first detection signal transmission procedure. Can be. As another example, the control unit 640 transmits the second detection signal to the transmission coil receiving the signal strength indicator having the largest value when there are a plurality of transmission coils receiving the signal strength indicator during the first detection signal transmission procedure. In the procedure, the sensing signal may be determined to be a transmitting coil to transmit, and the switch 621 may be controlled according to the determination result.
- the modulation / demodulator 630 includes a modulator 631 and a demodulator 632.
- the modulator 631 may modulate and transmit a control signal generated by the controller 640 to the switch 621.
- the modulation scheme for modulating the control signal may include a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a pulse width modulation scheme, and the like.
- FSK frequency shift keying
- PSK Phase Shift Keying
- the demodulator 632 may demodulate the detected signal and transmit the demodulated signal to the controller 640.
- the demodulated signal may include a signal control indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge (EOC) indicator, an overvoltage / overcurrent / overheat indicator, and the like.
- EC error correction
- EOC end of charge
- the present invention is not limited thereto, and may include various state information for identifying a state of the wireless power receiver.
- the demodulator 631 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 640 with a predetermined transmission coil identifier corresponding to the identified transmission coil.
- the demodulator 631 may demodulate a signal received through the transmission coil 623 and transmit the demodulated signal to the controller 640.
- the demodulated signal may include a signal strength indicator, but is not limited thereto, and the demodulated signal may include various state information of the wireless power receiver.
- the wireless power transmitter 600 may obtain the signal strength indicator through in-band communication using the same frequency used for wireless power transmission to communicate with the wireless power receiver.
- the wireless power transmitter 600 may transmit wireless power using the transmission coil 623 and may exchange various information with the wireless power receiver through the transmission coil 623.
- the wireless power transmitter 600 may include a separate coil corresponding to each transmission coil 623, and may perform in-band communication with the wireless power receiver using the provided separate coil. Should be.
- the sensing unit 650 may check the overvoltage flowing through the power converter 610, the power transmitter 620, and the modulator 630 under the control of the controller 640, and may receive the signal strength received from the wireless power receiver.
- the indicator can be sensed.
- FIG. 5 is a block diagram of a wireless power receiver interworking with a multi-coil wireless power transmitter according to an embodiment.
- the wireless power receiver 700 includes a receiving coil 710, a rectifier 720, a DC / DC converter 730, a load 740, a power sensing unit 750, and a modulator 761 /.
- a demodulation unit 760 including a demodulation unit 762 and a main control unit 770 may be included.
- AC power received through the receiving coil 710 may be delivered to a frequency filter (not shown) through a distribution switch (not shown).
- the frequency filter (not shown) may filter and transmit a plurality of different carrier frequencies to the rectifier 720.
- the rectifier 720 may convert the filtered AC power into DC power and transmit the DC power to the DC / DC converter 730.
- the DC / DC converter 730 may convert the strength of the rectifier output DC power into an intensity required by the load 740 and transmit the converted power to the load 740.
- the power sensing unit 750 may measure the intensity of the output DC power included in the rectifier 720 and provide the same to the main controller 770.
- the rectifier 720 may include a plurality of rectifiers.
- the main controller 770 may determine that the sensing signal is received when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value.
- the main controller 770 may control the modulator 762 to transmit a signal strength indicator corresponding to the detection signal by using the carrier frequency used to transmit the detection signal.
- the demodulator 761 may demodulate the output of the rectifier 720 to identify whether a sensing signal is received, and transmit information on which carrier frequency the identified sensing signal is transmitted to the main controller 770. Can provide.
- the main controller 770 may control the signal strength indicator to be transmitted through the modulator 762 using the same frequency as the carrier frequency used to transmit the identified sensing signal.
- FIG. 6 is a view for explaining a wireless power reception procedure defined in the WPC standard. Reference is made to the reference numerals of FIGS. 2, 4 and 5 together.
- the X axis is time T and the first Y axis is Current Amplitude of the Primary Cell of the wireless power receiver 700.
- the primary cell refers to a cell in which a single transmitting coil or multiple coils provide sufficient magnetic flux through an active area.
- the second Y-axis corresponds to a rectified voltage (Vr) detected by the receiver 700.
- the wireless power transmitter 600 and the wireless power receiver 700 may transition to a selection phase 210, a ping phase 220, and an identification phase 230.
- the wireless power transmitter 600 may enter the selection step 210.
- the wireless power receiver 700 may transition to the ping step 220 if the rectified voltage Vr is sufficiently high (predetermined Vr).
- the predetermined Vr may be set differently according to the device configuration.
- the wireless power receiver 700 may receive a detection signal from the wireless power transmitter 600.
- the wireless power receiver 700 may feed back a signal strength indicator to the wireless power transmitter 600.
- the receiver 700 may set the wait time Twake of the signal strength indicator.
- Twake can be set to 19 ⁇ 64ms, but can be configured differently depending on the device.
- the wait time (Twake) is greater than 64ms, the wireless charging may fail because the transition to the identification step 230 is not performed.
- the Stable Level of the Primary Cell may be set differently according to the device configuration.
- a signal strength indicator is transmitted in the ping step 220, the wireless power transmitter 600 removes the power signal, and then transitions to the identification step 230 in the reset time.
- the reset time (Tr) is a time required for the system to enter the identification phase, and may be set as a time for initialization of the receiver, and a reset time may be set for each coil. Tr may be 25ms, but may be configured differently according to the device, and if the reset time (Tr) exceeds 28ms, the wireless charging may fail because the transition to the identification step 230 is not performed.
- the wireless charging may fail because it does not transition to the identification step 230.
- the wireless power receiver 700 may transmit a signal strength indicator for each of the plurality of coils.
- a coil that transmits a weak detection signal may not receive a signal strength indicator.
- the wireless power receiver 700 may have a reset time for each coil, or may have a reset time after transmitting all signal strength indicators.
- FIG. 7 is a diagram illustrating a case where a state transition does not occur from the ping step of the prior art to the identification step.
- the wireless power transmitter 600 includes first to third coils.
- the wireless power transmitter 600 sequentially transmits a detection signal from the first coil to the third coil to the wireless power receiver 700.
- the wireless power receiver 700 transmits a signal strength packet to the third coil by determining that the third coil transmits the most suitable detection signal (for example, a detection signal having a high signal strength while exceeding a predetermined criterion).
- the wireless transmit receiver 700 transmits a Signal Strength (SS) packet and allows a first reset time.
- SS Signal Strength
- the receiver 700 may not transmit the SS packet with respect to the coil having a weak detection signal strength, but this may be implemented.
- the wireless power transmitter 600 transmits a detection signal from the first coil to the third coil again after the first reset time.
- the reason for transmitting the detection signal repeatedly is to more accurately perform the recognition for the charging of the door.
- the wireless power receiver 700 determines that the third coil transmits the most suitable sensing signal and transmits a signal strength packet to the third coil.
- the wireless transmit receiver 700 transmits an SS packet and allows a second reset time.
- the wireless power transmitter 600 and the wireless power receiver 700 transmit the SS packet and have the second reset time
- the wireless power transmitter 600 and the wireless power receiver 700 cannot enter the identification step when a specific time is exceeded. This prevents the wireless charging from entering the power transfer phase.
- the receiver 700 has a long standby time Twake for SS signal transmission, a reset time is set long, or when the current value of the primary cell falls below a predetermined size during the reset time, the alignment of the wireless receiver 700 is reduced. In the wrong case, the above problem may occur.
- FIGS. 8 and 9 are diagrams illustrating that a wireless power transmission system enters an identification step by changing a transmission order of sensing signal transmission of a multi-coil according to an embodiment.
- the wireless power transmitter 600 transmits a sensing signal twice (1 cycle, 2 cycles) by the multi-coil.
- the transmitter 600 does not receive the SS signal from the receiver 700 from the coil 1 and the coil 2.
- the transmitter 600 selects coil 3 that has received the SS signal.
- the transmitter 600 sends a sense signal from the coil 3 to the receiver 700.
- the wireless power surviving system can then enter the identification step.
- the transmitter 600 transmits a detection signal through the coil 3, even if it has a large number of Twake, Treset time according to the nature of the receiver 700, there is a spare time while the coil 2 and coil 1 transmits the detection signal.
- the system may enter the identification phase.
- the transmitter 600 controls the system to maintain a current value of 50% of the primary cell through the sensing signal of the coil 3, and as time passes, the receiver 700 sets the current value by a predetermined value (50 of the primary cell). % Or less), at which time, the transmitter 600 may transmit the detection signal to the receiver 700 again through the coil 3 to control the current value to exceed 50% of the primary cell in the reset time period.
- the wireless power receiver 700 may transmit coil information having excellent transmission efficiency to the wireless power transmitter 600 through the in-band channel instead of the SS signal. Then, the transmitter 600 may transmit the detection signal through the coil forming the primary cell based on this.
- the identification step may be performed without a problem.
- the transmitter 600 transmits a detection signal in the order of coil 3, coil 2, and coil 1 in 1 Cycle, and detects the signal again in the order of coil 3, coil 2, and coil 1 in 2 cycles based on the size of SS. By transmitting the control, the system can enter the identification step as shown in FIG.
- the receiver 700 may provide the transmitter 600 with the state of the receiver 700 through in-band communication (or near field communication).
- the transition to the identification step may be performed.
- FIG. 10 is a graph illustrating a change in current value of a wireless power receiver according to an operation of a wireless power transmitter for transmitting a detection signal. Assume the case of FIGS. 8 and 9. Since the X-axis, the first Y-axis, and the second Y-axis are the same as those in FIG. 6, description thereof will be omitted.
- the wireless power receiver 700 transmits the SS to the third coil in the first cycle and has a reset time.
- the current amplitude becomes less than 50% of the Stable Level, so that the first reset time cannot be completely filled.
- the wireless power transmitter 600 controls the third coil receiving the SS signal and transmits the detection signal to the wireless power receiver 700 in the second cycle, the current value of the wireless power receiver 700 increases. .
- the receiver 700 transmits the SS again to the coil 3 and maintains the current value (50% of the Stable Level of the primary cell) even in the reset time period, and the system enters the identification step.
- the current amplitude may be 50% or less of the stable level during the reset time, and thus may not transition to the identification step.
- the wireless power receiver 700 allocates too much Twake for transmitting the SS signal, the SS is not transmitted (the SS is not transmitted at the Stable Level 50% or less) and does not enter the identification step. You may not be able to. In addition, even when the coil alignment of the receiver 700 is not excellent, the transition to the identification step may not be possible.
- 11 is a flowchart illustrating a method of driving a wireless power transmission system for changing a transmission order of sensing signals for each coil according to an exemplary embodiment.
- the system may detect the end of the ping phase if the receiver 700 transmits an SS signal and the reset time has elapsed. In addition, the system may determine that the ping step is terminated even when the identification packet is transmitted.
- the system determines whether the identification step has been entered (S1120), if the identification step has been entered, and the wireless charging (S1130), it may be performed for the wireless charging.
- the system If the system has not entered the identification phase, it again monitors the end of the ping phase.
- the transmission pattern of the detection signal may be changed for each coil (S1140), and the ping stage may be entered again.
- FIG. 12 is a diagram illustrating a method of driving a wireless power system when receiving a signal strength indicator according to an embodiment through a plurality of coils.
- coils 2 and 3 of transmitter 600 receive an SS signal from receiver 700 at 1Cycle.
- the transmitter 600 may change the transmission order of the coils 2 and 3 at 2 cycles by determining the SS signal strengths received by the coils 2 and 3. In this case, the salping bar and the system enter the identification step.
- the transmitter 600 may simultaneously transmit a sensing signal through a plurality of coils (coil 2 and coil 3) and simultaneously transmit wireless power through a coil of the receiver 700.
- the receiver 700 may transmit the current value information to the transmitter 600 while transmitting the SS signal to the transmitter 600. Then, the transmitter 600 may transmit a detection signal based on this. In addition, when the current value falls by a predetermined amount in the middle of the reset time, the receiver 700 may transmit the corresponding information to the transmitter 600. In this case, the transmitter 600 may transmit a detection signal in preparation.
- the method according to the embodiment described above may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape , Floppy disks, optical data storage devices, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).
- the computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
- functional programs, codes, and code segments for implementing the above-described method may be easily inferred by programmers in the art to which the embodiments belong.
- the present invention can be applied to a wireless power transmission apparatus having a plurality of transmission coils.
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Abstract
Description
Claims (18)
- 복수의 송신 코일이 구비된 무선 전력 송신기에 있어서,제1 내지 제N 코일; 및제1 감지 신호를 상기 제1 내지 제N 코일을 통해 무선 전력 수신기로 송출하고, 상기 제1 감지 신호에 대응되는 제1 시그널 세기 지시자가 수신되면, 수신된 상기 제1 시그널 세기 지시자의 신호 세기에 기초하여, 제2 감지 신호 송출을 위한 제1 내지 제N 코일의 송출 순서를 조정하는 제어부;를 포함하며,상기 제어부는,조정된 송출 순서에 기초하여 상기 제2 감지 신호를 제1 내지 제N 코일을 통해 상기 수신기로 전송하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 제1 시그널 세기 지시자의 전송을 트리거하는 웨이크(Wake) 타임이 소정의 시간보다 길게 설정되는 경우, 제2 감지 신호 송출을 위한 제1 내지 제N 코일의 송출 순서를 조정하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 수신기를 리셋하는 리셋(reset) 타임이 소정의 시간보다 길게 설정되는 경우, 제2 감지 신호 송출을 위한 제1 내지 제N 코일의 송출 순서를 조정하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 수신기를 리셋하는 리셋(reset) 타임에서 상기 수신기의 소정의 전류값이 소정의 크기보다 작아지는 경우, 제2 감지 신호 송출을 위한 제1 내지 제N 코일의 송출 순서를 조정하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,수신된 상기 제1 시그널 세기 지시자의 신호 세기에 기초하여, 제2 감지 신호 송출을 위한 제1 내지 제N 코일의 송출 순서를 조정하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 제1 감지 신호를 상기 복수의 송신 코일 중 하나의 송신 코일을 통해 소정 주기로 송출되도록 제어하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 제1 시그널 세기 지시자가 수신된 적어도 하나의 코일을 통해 상기 제2 감지 신호가 송출되도록 제어하는, 무선 전력 송신기.
- 제1항에 있어서,상기 수신기가 상기 복수의 코일 중 외곽에 배치된 코일과 얼라인먼트(Alignment)가 소정 범위 내에서 일치하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제어부는,상기 제2 감지 신호의 송출 순서가 상기 제1 감지 신호의 송출 순서와 일치하여, 무선 전력 전송이 실패하는 경우, 제3 감지 신호 송출을 위한 위한 제1 내지 제N 코일의 송출 순서를 조정하는, 무선 전력 송신기.
- 제1항에 있어서,상기 제1 감지 신호는 상기 제1 내지 제N 코일에서 소정 주기로 동시에 송출되는, 무선 전력 송신기.
- 제1항에 있어서,상기 제1 감지 신호는 상기 제1 내지 제N 코일에서 미리 정의된 순서에 따라 전송되는, 무선 전력 송신기.
- 제1항에 있어서,상기 제1차 감지 신호 및 상기 제2차 감지 신호는 WPC 표준 또는 PMA 표준에 정의된 디지털 핑 신호인, 무선 전력 송신기.
- 제1항에 있어서,상기 제1 감지 신호와 상기 제2 감지 신호의 출력 전압 세기, 전송 주기 및 전송 시간 중 적어도 하나가 서로 상이한, 무선 전력 송신기.
- 복수의 송신 코일이 구비된 무선 전력 송신기로부터 무선 전력을 제공받는 무선 전력 수신기에 있어서,제1 감지 신호를 상기 복수의 송신 코일 중 적어도 하나로부터 수신하는 수신 코일; 및상기 제1 감지 신호에 대응되는 제1 시그널 세기 지시자의 전송을 트리거하는 웨이크(Wake) 타임 및 상기 수신기를 리셋하는 리셋(reset) 타임에 기초한 제1 시그널 세기 지시자를 상기 송신기로 전송하도록 제어하는 주제어부;를 포함하는, 무선 전력 수신기.
- 제14항에 있어서,상기 주제어부는,상기 웨이크 타임 또는 리셋 타임이 소정 시간보다 길게 설정되는 경우, 상기 송신기로부터 제2 감지 신호를 기 설정된 패턴과 다르게 수신하는, 무선 전력 수신기.
- 제14항에 있어서,상기 리셋 타임 중 전류 진폭이 소정 크기보다 작게 되는 경우, 상기 송신기로부터 제2 감지 신호를 기 설정된 패턴과 다르게 수신하는, 무선 전력 수신기.
- 복수의 송신 코일이 구비된 무선 전력 전송 시스템의 구동 방법에 있어서,무선 전력 전송을 위한 식별 단계에 진입하는지 상기 시스템을 모니터링하는 단계;상기 시스템이 상기 식별 단계에 진입하는 경우, 무선 전력 수신기가 충전되고 있는지 판단하는 단계; 및상기 수신기가 충전되지 않는 경우, 상기 시스템이 핑 단계에 진입하도록 구동하는 단계;를 포함하는, 무선 전력 전송 시스템의 구동 방법.
- 제17항에 있어서,상기 시스템이 핑 단계에 진입하는 경우, 상기 복수의 송신 코일을 통해 제1 감지 신호를 상기 무선 전력 수신기로 전송하도록 구동하는 단계;상기 무선 전력 수신기가 상기 제1 감지 신호에 대응되는 제1 시그널 세기 지시자를 무선 전력 송신기로 전송하도록 구동하는 단계;상기 무선 전력 송신기가 상기 제1 시그널 세기 지시자를 수신하면, 제2 감지 신호 송출을 위한 상기 복수의 송신 코일의 송출 순서를 조정하도록 제어하는 단계; 및조정된 송출 순서에 기초하여, 상기 제2 감지 신호를 상기 복수의 송신 코일을 통해 상기 수신기로 전송하는 단계:를 더 포함하는, 무선 전력 전송 시스템의 구동 방법.
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JP2018541429A JP6901491B2 (ja) | 2016-02-12 | 2017-02-02 | 複数の送信コイルを備えた無線電力器機及びその駆動方法 |
CN201780010991.3A CN108702031B (zh) | 2016-02-12 | 2017-02-02 | 具有多个发送线圈的无线电力装置及其驱动方法 |
US16/077,184 US10951072B2 (en) | 2016-02-12 | 2017-02-02 | Wireless power device having plurality of transmission coils and driving method therefor |
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