WO2018194409A1 - Procédé de détection de matériau étranger destiné à une charge sans fil et appareil associé - Google Patents

Procédé de détection de matériau étranger destiné à une charge sans fil et appareil associé Download PDF

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Publication number
WO2018194409A1
WO2018194409A1 PCT/KR2018/004589 KR2018004589W WO2018194409A1 WO 2018194409 A1 WO2018194409 A1 WO 2018194409A1 KR 2018004589 W KR2018004589 W KR 2018004589W WO 2018194409 A1 WO2018194409 A1 WO 2018194409A1
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WIPO (PCT)
Prior art keywords
foreign matter
wireless power
transmitter
quality factor
receiver
Prior art date
Application number
PCT/KR2018/004589
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English (en)
Korean (ko)
Inventor
박재희
권용일
Original Assignee
엘지이노텍(주)
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Publication date
Priority claimed from KR1020170052176A external-priority patent/KR102338396B1/ko
Application filed by 엘지이노텍(주) filed Critical 엘지이노텍(주)
Publication of WO2018194409A1 publication Critical patent/WO2018194409A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/15—Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • 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
    • H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • 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
    • 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

Definitions

  • the present invention relates to wireless power transfer technology, and more particularly, to a method and apparatus for detecting foreign matter disposed in a charging region of a wireless power transmitter.
  • 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 high frequency, microwaves, and lasers.
  • 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 a 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 through one coil. It's 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.
  • the FO may include a coin, a clip, a pin, a ballpoint pen, and the like.
  • the reference quality factor in the standard is a fryer with a specific transmit coil design defined in the standard that is measured for a specific operating frequency, which may be 100 kHz, with the receiver positioned at the charging interface and free of foreign material in the vicinity. It may be defined as a quality factor of the primary coil.
  • each transmission coil design has its own inductance, capacitance, and resistance, the initial quality factor values are different, and the values vary according to each receiver.
  • the transmitter can measure the quality factor by the voltage amplification ratio of the coil unit.
  • the amplified voltage is difficult to measure to a stable value, the error of the quality factor value is very large.
  • 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 method for detecting foreign matter for wireless charging and an apparatus and system therefor.
  • Another object of the present invention is to provide a foreign matter detection method and apparatus therefor, which can detect foreign matter more accurately using a reference value corresponding to a transmitter type.
  • Another object of the present invention is to detect foreign matter using an equivalent series resistance calculated using a reference quality factor value and a reference peak frequency corresponding to a transmitter type, and an equivalent series resistance calculated using a measured quality factor value and a measured peak frequency. It is to provide a foreign matter detection method and apparatus therefor that can be performed.
  • the present invention can provide a foreign matter detection method and apparatus therefor.
  • the foreign material detection method in the wireless power transmitter detects an object disposed in a charging region, and measures a quality factor value in an operating frequency band to search for a measured peak frequency having the maximum quality factor value. Storing the measured peak frequency and the measured quality factor value corresponding to the measured peak frequency, transmitting information about the transmitter type to the identified wireless power receiver, a reference quality factor value corresponding to the transmitter type, and The method may include receiving a reference peak frequency and detecting a foreign substance using at least one of the reference quality factor value and the reference peak frequency.
  • the reference quality factor value and the reference peak frequency may be received in the foreign matter detection status packet in the negotiation step.
  • the detecting of the foreign matter may include calculating a measurement equivalent series resistance using the measurement quality factor value and the measurement peak frequency and calculating a reference equivalent series resistance using the reference quality factor value and the reference peak frequency. And determining whether a foreign substance exists by using the measured equivalent series resistance and the reference equivalent series resistance.
  • the determining of the presence of the foreign matter may include determining whether the foreign matter exists by comparing the ratio of the measured equivalent series resistance and the reference equivalent series resistance with a predetermined ratio threshold.
  • the information about the transmitter type may be transmitted in the identification and configuration step.
  • the information about the transmitter type may be transmitted at the request of the identified wireless power receiver.
  • the reference peak frequency may be a frequency having a maximum quality factor value in the operating frequency band in a state where the identified wireless power receiver is disposed in a charging region of a wireless power transmitter corresponding to the transmitter type.
  • the foreign matter detection method may further include transmitting an ACK response or a NACK response or a No Decision (ND) response to the wireless power receiver according to the detection result.
  • ND No Decision
  • the foreign matter detection method may further include outputting a predetermined warning alarm after transmitting the response.
  • the foreign matter detection status packet may further include mode information, and based on the mode information, it may be identified whether the reference peak frequency and the reference quality factor value are included in the foreign matter detection status packet.
  • the detecting of the foreign matter may include a first determination step of determining whether there is a foreign matter using the measured quality factor value and the reference quality factor value, and whether the foreign matter is present using the measured peak frequency and the reference peak frequency.
  • the method may include detecting the foreign matter based on the second determination step of determining, the determination result of the first determination step, and the second determination step.
  • the foreign matter detection apparatus for detecting a foreign substance disposed in the charging region is a frequency measuring unit for measuring a quality factor value within an operating frequency band and a measured frequency factor value when an object is detected.
  • a computer-readable recording medium may be provided that records a program for executing any one of the foreign matter detection methods.
  • the present invention has an advantage of providing a foreign matter detection method for wireless charging and an apparatus and system therefor.
  • the present invention has the advantage of providing a foreign matter detection method and apparatus and system therefor capable of detecting foreign matter more accurately.
  • another object of the present invention is to provide a foreign matter detection method and apparatus therefor capable of detecting foreign matter more accurately by using a reference quality factor value and a reference peak frequency corresponding to a transmitter type.
  • the present invention is to detect the foreign matter by using the equivalent series resistance calculated using the reference quality factor value and the reference peak frequency corresponding to the transmitter type and the equivalent series resistance calculated using the measured quality factor value and the measured peak frequency. It is advantageous to provide a foreign matter detection method and apparatus therefor which are possible.
  • the present invention has the advantage that it is possible to accurately detect the foreign matter regardless of the type of the wireless power transmitter in which the wireless power receiver is disposed.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
  • FIG. 4 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
  • 5A is a flowchart illustrating a foreign material detection procedure in a negotiation step according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a foreign material detection procedure in a wireless power transmission system according to another embodiment of the present invention.
  • FIG. 8 is a diagram for describing a method of modulating and demodulating a wireless power signal according to an embodiment of the present invention.
  • FIG. 10 is a diagram for explaining types of packets according to an embodiment of the present invention.
  • FIG. 11 is a view for explaining the structure of the foreign matter detection apparatus according to an embodiment of the present invention.
  • FIG. 12 is a block diagram for explaining the configuration of a foreign matter detection apparatus according to another embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a message structure of a foreign matter detection status packet according to an embodiment of the present invention.
  • 14A is a diagram for explaining a message structure of a foreign matter detection status packet according to another embodiment of the present invention.
  • 14B is a diagram illustrating a message structure of an extended foreign object detection status packet according to an embodiment of the present invention.
  • 15 is a block diagram illustrating a configuration of a wireless charging system according to an embodiment of the present invention.
  • 16 is a view for explaining the structure of a foreign object detection status packet message according to another embodiment of the present invention.
  • 17A to 17I are diagrams for describing a foreign substance detection scenario according to an embodiment of the present invention.
  • the method when a foreign material detection method in a wireless power transmitter detects an object disposed in a charging region, the method detects a measurement peak frequency having a maximum quality factor value by measuring a quality factor value in an operating frequency band. Storing the measured peak frequency and the measured quality factor value corresponding to the measured peak frequency, transmitting information about the transmitter type to the identified wireless power receiver, a reference quality factor value corresponding to the transmitter type, and The method may include receiving a reference peak frequency and detecting a foreign substance using at least one of the reference quality factor value and the reference peak frequency.
  • module and “unit” for components used in the following description may be implemented as hardware components, including, for example, circuit elements, microprocessors, memory, sensors, and the like. This is merely an example, and some or all of the components may be implemented in software.
  • 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.
  • a device equipped with a function for transmitting wireless power on the wireless charging system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter for convenience of description.
  • a transmitter side, 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, Receivers, receivers and the like can be used interchangeably.
  • 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 standard may include, but is not limited to, a standard technology of an electromagnetic induction method 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 an embodiment of the present invention may be provided with at least one wireless power receiving means, and may receive wireless power from one or more transmitters.
  • 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 the present invention is not limited thereto. It is enough.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
  • a wireless charging system includes a wireless power transmitter 10 that largely transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 30 that receives the received power. Can be configured.
  • the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission.
  • the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication for exchanging information using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.
  • the information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other.
  • the status information and control information exchanged between the transmitting and receiving end will be more clear through the description of the embodiments to be described later.
  • the wireless power receiver 20 may obtain various state information of the electronic device 30.
  • the state information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, and the like.
  • the information may be obtained from the electronic device 30 and may be utilized for wireless power control.
  • the wireless power transmitter 10 may be configured with a plurality of wireless power transmitters.
  • the wireless power receiver 20 may be connected to a plurality of wireless power transmitters at the same time, and may simultaneously receive power from the connected wireless power transmitters and perform charging.
  • the number of wireless power transmitters connected to the wireless power receiver 20 may be adaptively based on the required power of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, and the available power of the wireless power transmitter. Can be determined.
  • FIG. 4 is a state transition diagram for explaining a wireless power transmission procedure.
  • 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, it may transition to ping step 420.
  • the transmitter When the transmitter detects an object, the transmitter enters the ping step 420 to wake up the receiver and transmits a digital ping for identifying whether the detected object is a wireless power receiver. If in ping step 420 the transmitter does not receive a response signal (eg, a signal strength packet) to the digital ping from the receiver, it may transition back to selection step 410. Also, in ping step 420, the transmitter may transition to selection step 410 upon receiving a signal from the receiver indicating that power transmission is complete, i.e., a charging complete packet.
  • a response signal eg, a signal strength packet
  • the transmitter receiving the FOD Status Packet may determine the presence or absence of the foreign matter by using at least one foreign matter detection method which will be described later.
  • the transmitter may transmit an ACK / NACK response to the receiver according to the determination result of the presence of the foreign matter.
  • the transmitter may transmit an ACK response.
  • the transmitter may transmit a NACK response.
  • the transmitter may receive information regarding the strength of the received power from the receiver in the correcting step 450, hereinafter, a business card called received power strength information for convenience of description.
  • the transmitter may transition to renegotiation step 470 if it is necessary to reconfigure the power transmission contract in accordance with a change in transmitter status.
  • the resonant frequency (f_resonant) is Is calculated.
  • a transmitter may identify a frequency value corresponding to a quality factor value having a maximum value among quality factor values measured in an operating frequency band, and store the same in a memory.
  • the quality factor of the transmitting coil can be measured in various ways.
  • the measuring circuit for measuring the quality factor of the transmitting coil is driven by a sinusoidal voltage, and may include a resonance coil and a resonance capacitor connected in series.
  • the inductance value of the resonant capacitor may be selected such that the resonant frequency of the wireless charging system is in the appropriate range.
  • the resonance frequency may be 100 kHz, but is not limited thereto.
  • the quality factor of the transmission coil may be calculated as the ratio of the root mean square (RMS) voltage applied to the corresponding transmission coil and the RMS voltage applied to the corresponding system at the resonance frequency.
  • RMS root mean square
  • the resonant frequency may change due to the receiving coil assembly (or secondary coil assembly) and the friendly metal components.
  • the copper metal part may mean a metal part constituting an electronic device equipped with a wireless power receiver or attached as an accessory to an electronic device.
  • the transmitter may determine the presence of the foreign matter based on the reference value received from the receiver.
  • the basic foreign matter detection method in the negotiation step 430 includes a step in which the transmitter receives a predetermined reference value from the receiver, a step in which the transmitter adjusts the boundary value based on the received reference value, and compares the measured value with the boundary value.
  • the transmitter may include determining whether the foreign material exists and transmitting the ACK or NACK response to the receiver according to a result of the determination of the presence of the foreign material by the transmitter.
  • the reference value may be a reference quality factor value and / or a reference peak frequency, but is not limited thereto.
  • each transmitter may have different initial quality factor values.
  • Table 1 shows that the initial quality factor values measured by the LCR meter are different for each transmitter type. Referring to Table 1 below, since all transmitters have different initial quality factor values, compensating for such initial quality factor values is very difficult, but may be an important challenge. In addition, since the actual transmitter has a lower accuracy for measuring the quality factor value than the LCR meter, it is difficult to compensate for the measured value.
  • the resonant frequency when the receiver is not disposed in the charging region is similar. Since the resonant frequency is determined by the L and C values, the other characteristic values are not very relevant. The peak frequency for each transmission coil type is measured close enough to the reference operating frequency. Thus, the initial quality factor value may be approximately equal to the quality factor value measured at 100 kHz, which is the reference operating frequency in most transmitters.
  • the foreign material detection method using the peak frequency is much more reliable since the initial value for such compensation is constant even if a conversion (or compensation) between the measured value and the reference value is required.
  • the transmitter designer may only consider changing the peak frequency value for each transmitter design purpose.
  • the difference between the receiver types of the peak frequencies measured by the LCR meter for each transmission coil type is very small.
  • the difference in peak frequency for each transmission coil type is less than 5%-except Type 5, or less than 5 kHz.
  • the difference may be a numerical value within a range predictable by the transmitter designer.
  • Type 4 39 ( ⁇ 9%) 35.15 ( ⁇ 25%) 86.6 ( ⁇ 1%) 93.2 ( ⁇ 2%)
  • the transmitter since the compensation (conversion) of the quality factor value is difficult, there is a problem that the accuracy of the foreign material detection is inferior.
  • the reference peak frequency of the wireless power receiver is the peak frequency measured at the primary coil of the test wireless power transmitter # MP1, i.e., the reference transmitter, with the corresponding wireless power receiver placed in the charging area with no foreign matter around. It can be defined as.
  • Positioning the wireless power receiver in the charging region of the reference transmitter is as follows.
  • the secondary coil of the wireless power receiver is aligned with the primary coil of # MP1 which is a test wireless power transmitter.
  • the receiving coil of the wireless power receiver may be disposed in the center of the charging area.
  • the wireless power receiver can be moved and moved along a distance offset unit-for example, +/- 5 mm-along the X and Y axes of the charging region—that is, the charging face or the charging bed—without rotation.
  • a reference peak frequency at the center position and four offset positions of the charging region may be determined, and the largest value may be selected (determined) as a reference peak frequency corresponding to the corresponding wireless power transmitter.
  • the voltage applied to the coil of the test wireless power transmitter that is, the range of the primary coil voltage may be 0.85 ⁇ 0.25 Vrms.
  • the wireless power receiver may report its reference peak frequency value to the wireless power transmitter using a predetermined packet, for example, a FOD Status Packet.
  • a predetermined packet for example, a FOD Status Packet.
  • the reference peak frequency may be reported with an accuracy of 5 kHz or more.
  • the change of the transmission coil resonance frequency may be detected, and the presence of the foreign matter may be determined according to the detection result.
  • the resonance frequency may be measured as a peak frequency corresponding to the quality factor value.
  • the wireless power receiver can provide the wireless power transmitter with information about the reference peak frequency so that it is possible to determine whether the increase in the peak frequency measured at the wireless power transmitter is due to foreign matter.
  • the reference peak frequency may be a peak frequency measured at the transmitting coil of the test wireless power transmitter # MP1 when only the wireless power receiver is disposed in the charging region without foreign matter in the surroundings.
  • the foreign material detection method based on the change of the peak frequency according to an embodiment of the present invention can be made through the following four steps.
  • the wireless power transmitter measures the peak frequency of the transmitting coil before starting power transmission.
  • the wireless power transmitter may measure the peak frequency of the transmitting coil before initiating a digital ping to wake up the wireless power receiver.
  • the wireless power receiver may transmit a reference peak frequency value to the wireless power transmitter.
  • the wireless power receiver may transmit a reference peak frequency value by using a foreign object detection status packet in a negotiation step.
  • the wireless power transmitter may determine an appropriate threshold value using the reference peak frequency value.
  • the wireless power transmitter may determine an appropriate boundary value at the negotiation stage.
  • the wireless power transmitter may determine a boundary value in consideration of design differences (that is, characteristic differences) between its own transmission coil and the transmission coil of the test wireless power transmitter.
  • the wireless power transmitter may stop the power transmission in the negotiation step if the peak frequency value measured in its transmission coil exceeds the threshold value. That is, when the measured peak frequency value exceeds the boundary value, the wireless power transmitter may determine that the foreign matter exists in the charging region.
  • the transmitter has no information to transmit to the receiver for foreign material detection before entering the power transmission step.
  • information necessary for detecting foreign matters that the wireless power transmitter may provide to the receiver before entering the power transmission step may include transmission coil type information, a transmission coil assembly, or a primary coil unit. At least one of the information on the resonant frequency of the), the quality factor of the transmitting coil assembly or the primary coil unit (primary coil unit).
  • the receiver when the receiver receives information on the transmission coil type from the transmitter, the receiver reads from a memory provided with reference values (eg, reference quality factor values, reference peak frequency values, etc.) corresponding to the previously stored transmission coil types. I can send it to a transmitter.
  • reference values eg, reference quality factor values, reference peak frequency values, etc.
  • the transmitter may receive a reference value mapped to its transmission coil type. Therefore, the transmitter does not need to compensate the reference value separately.
  • the reference peak frequency value measured corresponding to the transmitter having the received resonance frequency characteristic may be transmitted to the transmitter.
  • the transmitter since the transmitter receives a reference peak frequency value suitable for its type, there is an advantage that it is not necessary to perform a procedure for compensating a separate reference peak frequency value.
  • the transmitter may provide the receiver with information about the transmission coil type or information about the resonant frequency in the negotiation step.
  • the wireless power receiver may request information about a design of the connected wireless power transmitter using a general request packet (S551).
  • the information about the design of the wireless power transmitter may include information for identifying the type and number of coils included in the transmitting coil assembly (or unit) mounted in the transmitter.
  • the wireless power transmitter when the wireless power transmitter receives a general request packet requesting information about the design of the wireless power transmitter, the wireless power transmitter may be configured to identify whether the transmitting coil unit mounted on the transmitter comprises a single coil or a plurality of coils. / Transmit a predetermined response packet including a plurality of type indicators and a transmission coil type constituting the transmission coil unit, for example, may be the Power Transmitter Design Packet of FIG. 5B to be described later-to the wireless power receiver It may be (S552).
  • the power transmitter design packet 560 may include a singular / plural type field 561 and a transmission coil type field 562.
  • the transmission coil type recorded in the transmission coil type field 562 may be a reference design number or a power interface indicator for uniquely identifying the corresponding transmission coil, but is not limited thereto. Does not.
  • the reference design number may mean a designated number of coil designs defined in the standard.
  • the power interface indicator may refer to an indicator that can be expressed as a common characteristic between the respective transmission designs.
  • the wireless power receiver determines a reference value based on information included in the power transmitter design packet, for example, information about a transmission coil type. Can be determined (S553).
  • the reference value may include a frequency shift value, a reference peak frequency value, a reference quality factor value, and the like.
  • the wireless power receiver stores and stores the reference value (s) corresponding to each transmission coil type (or transmission coil unit) in the internal memory in advance, and when the power transmitter design packet is received from the transmitter, The corresponding reference value can be read.
  • a reference value corresponding to each transmission coil type is described as being stored and maintained in a memory.
  • the wireless power receiver according to another embodiment corresponds to each resonance frequency of the transmission coil.
  • the reference value may be stored in memory and maintained.
  • the wireless power transmitter may transmit a resonant frequency value corresponding to the mounted transmission coil to the receiver by using a predetermined packet, for example, a power transmitter design packet.
  • the wireless power receiver may transmit a foreign matter detection status packet including the determined reference value to the wireless power transmitter (S554).
  • the wireless power transmitter may perform a predetermined foreign matter detection procedure based on the reference value included in the foreign matter detection status packet.
  • the wireless power transmitter may transmit an ACK response to the wireless power transmitter according to the foreign matter detection result (S555).
  • the wireless power receiver may send to the wireless power transmitter a packet requesting information about the capability of the wireless power transmitter, for example via a general request packet, upon receipt of a normal response.
  • the wireless power transmitter may transmit a packet including its capability information, for example, a power transmitter capability packet to the wireless power receiver (S556).
  • the wireless power receiver may send a predetermined packet including a guaranteed power value (eg, a special request packet) to the wireless power transmitter to receive the guaranteed power. If it is possible to provide the guaranteed power value required by the receiver, the wireless power transmitter may transmit a normal response to the wireless power receiver (S557).
  • a guaranteed power value eg, a special request packet
  • the wireless power receiver may terminate the negotiation procedure by sending a packet indicating that the negotiation has ended, for example, may be sent via a special request packet, to the wireless power transmitter.
  • 5C is a flowchart illustrating a foreign material detection procedure in a wireless power transmission system according to an embodiment of the present invention.
  • the wireless power transmitter 510 may measure a quality factor value at a predetermined reference operating frequency before entering the ping step (S501).
  • the reference operating frequency at which the quality factor value is measured may be a resonance frequency, but is not limited thereto.
  • the wireless power transmitter 510 may store the measured quality factor value in the internal memory (S502).
  • the wireless power transmitter 510 may enter the ping step and perform the sensing signal transmission procedure described with reference to FIG. 3 (S503).
  • the wireless power receiver 520 may enter an identification and configuration step and transmit information about its transmitter type (Tx_Type) to the wireless power receiver 520 (S504).
  • the wireless power receiver 510 may read a reference quality factor value corresponding to the received transmitter type from the corresponding memory (S505).
  • the wireless power receiver 510 may maintain a table to which reference quality factor values for each transmitter type are mapped (hereinafter, referred to as a reference quality factor mapping table) for convenience of description.
  • the electronic device may interwork with a specific server through a wired / wireless communication network and receive update information on the reference quality factor mapping table from the corresponding server.
  • the manufacturer or vendor of the wireless power transmitter may register a reference quality factor value for the wireless power transmitter in the server.
  • the wireless power receiver 520 may transmit the read reference quality factor value to the wireless power transmitter 510 (S506).
  • the wireless power transmitter 510 may detect the foreign matter by comparing the measured quality factor value with the determined threshold value (S508). Here, if the measured quality factor value is smaller than the threshold value, the wireless power transmitter 510 may determine that foreign matter exists in the charging area.
  • the wireless power transmitter 510 may transmit an ACK response or a NACK response to the wireless power receiver 520 according to the foreign matter detection result.
  • the reference peak frequency means the frequency at which the highest quality factor value is measured in the transmitter of the corresponding transmitter type
  • the reference quality factor value means the quality factor value measured at the reference peak frequency
  • the wireless power receiver 620 may transmit the extracted reference quality factor value and / or information about the reference peak frequency to the wireless power transmitter 610 (S605) corresponding to the received transmitter type.
  • the wireless power receiver 620 may transmit the information about the reference quality factor value and / or the reference peak frequency to the wireless power transmitter 610 using the foreign matter detection status packet.
  • the order of performing the first judgment and the second judgment may be reversed. That is, the first determination may be performed after the second determination.
  • the wireless power transmitter 610 may transmit an ACK response or a NACK response to the wireless power receiver 620 according to the foreign matter detection result (610).
  • FIG. 7 is a flowchart illustrating a foreign material detection procedure in a wireless power transmission system according to another embodiment of the present invention.
  • the wireless power transmitter 710 may measure the quality factor value and the peak frequency in the operating frequency band before entering the ping step (S701).
  • the wireless power transmitter 710 may measure a quality factor value at predetermined frequency intervals within an operating frequency band, and determine a frequency having a maximum quality factor value as a peak frequency.
  • the wireless power transmitter 710 may transmit information about the transmitter type to the wireless power receiver 720 using a predetermined transmitter type packet.
  • the wireless power transmitter 710 may calculate reference equivalent series resistances (Reference ESR, ESR_reference) using the received reference peak frequency PF_reference and reference quality factor value Q_reference (S708).
  • ESR_reference is And ESR_measured is It can be calculated as
  • the ratio of ESR_referenc and ESR_measured may be calculated as follows.
  • Wireless power transmitter Wow If the ratio of exceeds the predefined ratio threshold value it can be determined that the foreign matter is present.
  • the ratio threshold value can be determined by the experimental result. For example, If it is larger than 0.2, it can be determined that foreign matter exists.
  • the wireless power transmitter 10 and the wireless power receiver 20 may encode or decode a transmission target packet based on an internal clock signal having the same period.
  • the wireless power signal is modulated with a specific frequency, as shown by reference numeral 41 of FIG. 1.
  • AC signal may not be.
  • the wireless power signal may be an AC signal modulated by a specific modulation scheme as shown in FIG.
  • the modulation scheme may include, but is not limited to, an amplitude modulation scheme, a frequency modulation scheme, a frequency and amplitude modulation scheme, a phase modulation scheme, and the like.
  • the encoded binary data may be applied with a byte encoding scheme, as shown at 830.
  • the byte encoding scheme includes a start bit and a stop bit for identifying a start and type of a corresponding bit stream for an 8-bit encoded binary bit stream.
  • the method may be a method of inserting a parity bit for detecting whether an error of a corresponding bit stream (byte) occurs.
  • FIG. 9 is a diagram for describing a packet format according to an embodiment of the present invention.
  • a packet format 900 used for information exchange between the wireless power transmitter 10 and the wireless power receiver 20 may be used for acquiring synchronization for demodulating the packet and identifying the correct start bit of the packet.
  • the packet receiver may identify the size of the message 930 included in the packet based on the header 920 value.
  • the header 920 may be defined in each step of the wireless power transfer procedure, and in part, the header 920 value may be defined to have the same value in different steps of the wireless power transfer procedure.
  • a header value corresponding to an end power transfer of a ping step and an end of power transfer of a power transfer step may be equal to 0x02.
  • the message 930 includes data to be transmitted at the transmitting end of the packet.
  • the data included in the message 930 field may be a report, a request, or a response to the counterpart, but is not limited thereto.
  • the packet 900 may further include at least one of a transmitter identification information for identifying a transmitter that transmitted the packet and a receiver identification information for identifying a receiver for receiving the packet.
  • the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like, but are not limited thereto and may be information capable of distinguishing a receiver and a transmitter from a wireless charging system.
  • the packet 900 may further include predetermined group identification information for identifying the corresponding reception group when the packet is to be received by a plurality of devices.
  • FIG. 10 is a diagram for explaining types of packets according to an embodiment of the present invention.
  • a table 1010 is a packet transmitted from a wireless power receiver to a wireless power transmitter, and a table 1010 is a packet transmitted from a wireless power transmitter to a wireless power receiver.
  • the packet transmitted from the wireless power receiver to the wireless power transmitter includes a signal strength packet for transmitting strength information of the detected ping signal, an end power transfer type for requesting the transmitter to stop power transmission, Power Control Hold-off packet for transmitting time information waiting to adjust actual power after receiving control error packet for control control, configuration packet for transmitting configuration information of receiver, receiver identification information Transmitting identification packets and extended identification packets for transmission, general request packets for sending general request messages, special request packets for sending special request messages, reference quality factor values for FO detection and / or reference peak frequency values FOD Status Packet, Extended FOD Status Packet Control error packet to control the outgoing power of transmitter, re Packet re-negotiation for the disclosure, may include a 24-bit and 8-bit packets received power received power packet and the current state of charge packets for transmitting charging status information of the load for transferring the intensity information of the received power.
  • the packet transmitted from the wireless power transmitter to the wireless power transmitter may include a power transmitter design packet for identifying the power transmitter design.
  • a transmitter type packet may be additionally defined and used by a wireless power transmitter to transmit information about its transmitter type.
  • the transmitter type packet used by the wireless power transmitter to transmit information about its transmitter type is determined in the identification and configuration step 430 or negotiation step 440 of FIG. 4 after communication with the wireless power receiver is connected. Can be sent.
  • a power transmitter design packet used to transmit information about design characteristics of a transmitting coil unit equipped with a wireless power transmitter may be transmitted in a negotiation step 440.
  • a predetermined identifier or identification code for identifying at least one of manufacturer information, model name information, and power class information of the corresponding wireless power transmitter may be recorded.
  • the message field of the power transmitter design packet contains information for identifying the type of coil used in the transmitting coil assembly or transmitting coil unit mounted on the corresponding wireless power transmitter, that is, the transmitting coil type information and the coil of the coil included in the transmitting coil unit. It may include at least one of information about the number.
  • the information on the number of coils may be information for identifying whether the number of coils is single or plural, but is not limited thereto.
  • the packets may be transmitted using in-band communication using the same frequency band as the frequency band used for wireless power transmission.
  • FIG. 11 is a view for explaining the structure of the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus described in the following embodiments may be a wireless power transmitter or some components mounted in the wireless power transmitter.
  • the foreign matter detection device 1100 includes a power supply 1101, a DC-DC converter 1110, an inverter 1120, a resonant circuit 1130, a measurement unit 1140,
  • the communication unit 1160, the sensing unit 1170, the alarm unit 1175, and the controller 1180 may be configured to be included.
  • the foreign matter detection apparatus 1100 according to the present embodiment may be mounted on a measuring device for authentication of a wireless power transmitter or a wireless power receiver.
  • the resonant circuit 1130 includes a resonant capacitor 1131 and an inductor (or a transmitting coil) 1132, and the communication unit 1160 includes at least one of a demodulator 1116 and a modulator 1162. Can be.
  • the power supply 1101 may receive DC power from an external power supply terminal or a battery and transmit the DC power to the DC-DC converter 1110.
  • the battery may be mounted inside the foreign matter detection device 1100 and may be configured to be charged, but this is only one embodiment, and the power unit 1101 of the foreign matter detection device 1100 in the form of an auxiliary battery or an external battery may be used. It may be connected via a predetermined cable.
  • the DC-DC converter 1110 may convert the intensity of the DC power input from the power supply unit 1101 into the DC power of a specific intensity under the control of the controller 1180.
  • the DC-DC converter 1110 may be configured as a variable voltage regulator capable of adjusting the strength of the voltage, but is not limited thereto.
  • the inverter 1120 may convert the converted DC power into AC power.
  • the inverter 1120 may convert a DC power signal input through a plurality of switch controls provided into an AC power signal and output the converted AC power signal.
  • the inverter 1120 may include a full bridge circuit, but is not limited thereto.
  • the inverter 1120 may include a half bridge.
  • the inverter 1120 may include both a half bridge circuit and a full bridge circuit.
  • the controller 1180 may operate the inverter 1120 as a half bridge or a full bridge. Can be determined and controlled.
  • the wireless power transmission apparatus may adaptively control the bridge mode of the inverter 1120 according to the strength of the power required by the wireless power receiver.
  • the bridge mode includes a half bridge mode and a full bridge mode.
  • the controller 1180 may control the inverter 1120 to operate in the half bridge mode.
  • the controller 1180 may control to operate in the full bridge mode.
  • the wireless power transmitter may adaptively determine the bridge mode according to the sensed temperature and drive the inverter 1120 according to the determined bridge mode.
  • the controller 1180 may deactivate the half bridge mode and control the full bridge mode to be activated. That is, the wireless power transmitter increases the voltage through the full bridge circuit and decreases the strength of the current flowing through the resonant circuit 1130 to transmit power of the same intensity, thereby reducing the internal temperature of the wireless power transmitter below a predetermined reference value. Can be controlled to maintain.
  • the amount of heat generated in an electronic component mounted on an electronic device may be more sensitive to the strength of the current than the strength of the voltage applied to the electronic component.
  • the inverter 1120 may not only convert DC power into AC power but also change the strength of the AC power.
  • the inverter 1120 may adjust the intensity of the AC power output by adjusting the frequency of a reference alternating current signal used to generate AC power under the control of the controller 1180.
  • the inverter 1120 may be configured to include a frequency oscillator for generating a reference AC signal having a specific frequency, but this is only one embodiment, another example is that the frequency oscillator is separate from the inverter 1120 Is configured to be mounted on one side of the foreign matter detection device 1100.
  • the foreign matter detection device 1100 may further include a gate driver (not shown) for controlling a switch provided in the inverter 1120.
  • the gate driver may receive at least one pulse width modulation signal from the controller 1180, and control the switch of the inverter 1120 according to the received pulse width modulation signal.
  • the controller 1180 may control the intensity of the output power of the inverter 1120 by controlling the duty cycle of the pulse width modulated signal, that is, the duty rate and the phase.
  • the controller 1180 may adaptively control the duty cycle and phase of the pulse width modulated signal based on the feedback signal received from the wireless transmission receiver.
  • the measurement unit 1140 may calculate a quality factor value and an inductance value for the resonance circuit 1130 by measuring voltage, current, and impedance of both ends of the resonance capacitor 1131 according to the control signal of the controller 1180.
  • the calculated quality factor value and inductance value may be transferred to the controller 1180, and the controller 1180 may store the quality factor value and inductance value received from the measurement unit 1140 in a predetermined recording area.
  • the measuring unit 1140 is a memory (not shown) provided by measuring a quality factor value corresponding to a predetermined reference operating frequency under the control of the controller 1180-a business card called a reference measurement quality factor value for convenience of description. Can be stored in a predetermined recording area.
  • the measurement unit 1140 may measure the quality factor value in the operating frequency band in a predetermined frequency unit under the control of the controller 1180, and transmit the measurement result to the controller 1180.
  • the controller 1180 suspends power transmission and measures the quality factor value at a plurality of different frequencies in the operating frequency band before entering the ping step. ) Can be requested.
  • the controller 1180 may identify a frequency corresponding to the largest value among the measured quality factor values, and determine the identified frequency as the measured peak frequency.
  • the controller 1180 may store a measurement peak frequency and a quality factor value at the measurement peak frequency, that is, a measurement quality factor value, in a memory (not shown).
  • the controller 1180 When the FOD status packet is received from the modulator 1162 in the negotiation step, the controller 1180 includes information included in the FOD status packet, for example, a reference quality factor value and a reference peak frequency corresponding to the transmitter type. Based on the threshold value (or threshold range) for determining whether there is a foreign matter can be determined.
  • the threshold value or threshold range
  • the FOD status packet may include at least one of a reference quality factor value Q_reference and a reference peak frequency value PF_reference corresponding to the corresponding transmitter type.
  • the controller 1180 may calculate the measurement equivalent series resistance ESR_measured using the received reference quality factor value and the reference peak frequency.
  • controller 1180 may calculate the reference equivalent series resistance ESR_reference using the measurement quality factor value and the measurement peak frequency.
  • the controller 1180 may determine whether a foreign substance exists using the ESR_measured and the ESR_reference.
  • the communication unit 1230 may obtain a Foreign Object Detection (FOD) Status Packet (FOD) in the negotiation step.
  • the communication unit 1230 may receive a control error packet, a received power packet, and the like for power control in the power transmission step.
  • FOD Foreign Object Detection
  • FOD Status Packet
  • the foreign matter detection status packet may include at least one of a reference quality factor value Q_reference and a reference peak frequency PF_reference corresponding to the transmitter type.
  • the controller 1290 may finally determine whether there is a foreign substance based on the foreign substance detection result of the detector 1250.
  • the controller 1290 may transmit an ACK response, NACK response, or ND (No Decision) response to the wireless power receiver according to the determination result of the presence of the foreign matter.
  • FIG. 13 is a view for explaining the structure of a foreign matter detection status packet message according to an embodiment of the present invention.
  • the foreign material detection status packet message 1300 is shown in reference numeral 1304, when the mode 1302 field is set to binary '00', all bits of the first data 1301 field are written as 0.
  • the second data 1303 field information corresponding to the quality factor value measured and determined using the authentication wireless power transmitter in a state where the power of the wireless power receiver is turned off may be recorded.
  • the quality factor value may be measured at a predetermined reference operating frequency.
  • the reference operating frequency may be 100 KHz, but is not limited thereto.
  • the reference peak frequency value may mean a frequency having the largest quality factor value in the operating frequency band while only the wireless power receiver is disposed in the charging region of the transmitter corresponding to the transmitter type.
  • the reference peak frequency is not a peak frequency determined based on the quality factor value measured at the authentication wireless power transmitter.
  • FIG. 14A illustrates a structure of a foreign object detection status packet message according to another embodiment of the present invention.
  • the receiver transmits a foreign object detection status packet in which the mode 1412 field is set to binary '10' to the transmitter so that the transmitter detects the foreign object detection based on the information included in its foreign object detection status packet and its transmission coil type. It is also possible to control to perform a procedure of correcting (converting) a reference value.
  • the reception controller 1521 determines the information corresponding to the information corresponding to the authentication wireless power transmitter—for example, the reference peak frequency value corresponding to the authentication wireless power transmitter ( Or a foreign material detection status packet or an extended foreign material detection status packet including a frequency shift value), a reference quality factor value corresponding to the authentication wireless power transmitter, and the packet generated by the modulator 1622. 1510).
  • Some of the components of the foreign matter detection apparatus of FIG. 12, or some of the functions and operations of the components may be additionally provided or mounted on the wireless power transmitter 1510 of FIG. 15.
  • 16 is a view for explaining the structure of a foreign object detection status packet message according to another embodiment of the present invention.
  • the foreign object detection status packet message 1600 may have a length of 2 bytes, and a 6-bit reserved field 1601, a 2-bit mode 1612 field, and 1 byte. It may be configured to include a reference value field of length (Reference Value, 1603).
  • the version may include at least one of a software version, a protocol version, a standard version, and a hardware version mounted on the wireless power receiver.
  • the wireless power transmitter may check whether the field values included in the received foreign object detection status packet are normal, and if the received packet is not normal, the wireless power transmitter may transmit a Not-Defined (ND) response to the wireless power receiver. . That is, if there is no appropriate response defined for the received packet, the wireless power transmitter may send an ND response to the wireless power receiver and ignore the contents of the received packet.
  • ND Not-Defined
  • the foreign matter detection procedure according to the present embodiment may be completed before entering the power transmission step.
  • the wireless power receiver controls not to provide power above a predetermined reference value to the output terminal of the wireless power receiver until the power signal transmission of the wireless power transmitter is stopped. can do.
  • 17A to 17C are diagrams for explaining a scenario of transition from a negotiation step to a power transmission step in the foreign matter detection method according to an embodiment of the present invention.
  • the receiver may transmit a first FOD status packet to the transmitter. If the received first FOD status packet is normal, the transmitter may perform a first foreign matter detection procedure based on the first FOD status packet. As a result of the first foreign matter detection, if no foreign matter exists, the transmitter may generate an ACK response and transmit it to the receiver.
  • the receiver may transmit a first FOD status packet to the transmitter. If the first FOD status packet is not normal, the transmitter may generate and transmit an ND response to the receiver.
  • the receiver may send a second FOD status packet to the transmitter. If the second FOD status packet is normal, the transmitter may perform a foreign matter detection procedure based on the received second FOD status packet. As a result of the foreign object detection, if there is no foreign object, the transmitter may generate an ACK response and transmit it to the receiver.
  • the receiver may send a second FOD status packet to the transmitter. If the second FOD status packet is not normal, the transmitter may generate an ND response and transmit it to the receiver.
  • the receiver since the receiver has not received at least one NACK response or none of the ND responses in response to the first to second FOD status packets, the receiver may enter the power transmission step.
  • the receiver may transmit a first FOD status packet to the transmitter. If the received first FOD status packet is normal, the transmitter may perform a first foreign matter detection procedure based on the first FOD status packet. As a result of the detection of the first foreign matter, if the foreign matter exists, the transmitter may generate a NACK response and transmit it to the receiver.
  • the receiver output may be limited to be below the reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • the second FOD status packet when the NACK is received in response to the first FOD status packet, the second FOD status packet may not be transmitted. In this case, since at least one NACK response is received, the receiver output may be limited to be below a reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • Restricting the receiver output to be below the reference value may mean that the receiver does not request the requested amount of power from the transmitter. Or it may mean not attempting to receive power greater than 5 Watts from the transmitter. The same may also be interpreted in the following description.
  • the receiver output may be limited to be below the reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • the receiver may send a second FOD status packet to the transmitter. If the second FOD status packet is normal, the transmitter may perform a second foreign matter detection procedure based on the second FOD status packet. As a result of the detection of the second foreign matter, if the foreign matter exists, the transmitter may generate a NACK response and transmit it to the receiver.
  • the receiver output may be limited to be below the reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • the receiver may transmit a first FOD status packet to the transmitter. If the first FOD status packet is not normal, the transmitter may generate and transmit an ND response to the receiver.
  • the receiver may send a second FOD status packet to the transmitter. If the second FOD status packet is not normal, the transmitter may generate and transmit an ND response to the receiver.
  • the receiver since the receiver receives only the ND response in response to all FOD status packets, the receiver may limit the output of the receiver to be below the reference value without entering the power transmission step.
  • the receiver may send a second FOD status packet to the transmitter. If the second FOD status packet is not normal, the transmitter may generate and transmit an ND response to the receiver.
  • the receiver output may be limited to be below the reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • the second FOD status packet when the NACK is received in response to the first FOD status packet, the second FOD status packet may not be transmitted. In this case, since at least one NACK response is received, the receiver output may be limited to be below a reference value until the power signal received from the transmitter is removed without entering the power transmission step.
  • the receiver may transmit a first FOD status packet to the transmitter. If the first FOD status packet is not normal, the transmitter may generate and transmit an ND response to the receiver.
  • the receiver may send a second FOD status packet to the transmitter.
  • the transmitter may perform the foreign matter detection procedure based on the second FOD status packet if the received second FOD status packet is normal. As a result of the detection, if a foreign object exists, the transmitter may generate a NACK response and transmit it to the receiver.
  • the receiver output can be limited to be below the reference value until the power signal received from the transmitter is removed without entering the power transmission step. have.
  • the methods according to the embodiments described above may be stored in a computer-readable recording medium that is produced as a program for execution in a computer, and examples of the computer-readable recording medium may include ROM, RAM, CD-ROM, and magnetic tape. , Floppy disks, optical data storage, and the like.
  • 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 used in the field of wireless charging, and in particular, it can be applied to an apparatus for detecting a foreign matter disposed in the charging area.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Nonlinear Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne un procédé de détection de matériau étranger, ainsi qu'un appareil et un système associés. Selon un mode de réalisation de l'invention, un procédé de détection d'un matériau étranger dans un émetteur de puissance sans fil peut comprendre les étapes consistant : à mesurer une valeur de facteur de qualité dans une bande de fréquence de fonctionnement de manière à rechercher la fréquence maximale de mesure à laquelle la valeur de facteur de qualité est la plus grande, lorsqu'un objet placé dans une zone de charge est détecté ; à stocker la fréquence maximale de mesure et une valeur de facteur de qualité de mesure correspondant à la fréquence maximale de mesure ; à transmettre des informations concernant un type d'émetteur à un récepteur d'énergie sans fil identifié ; à recevoir une valeur de facteur de qualité de référence et une fréquence maximale de référence correspondant au type d'émetteur ; et à utiliser la valeur de facteur de qualité de référence et/ou la fréquence maximale de référence de manière à détecter un matériau étranger. Par conséquent, la présente invention est avantageuse en ce qu'un matériau étranger peut être détecté plus efficacement et précisément.
PCT/KR2018/004589 2017-04-19 2018-04-19 Procédé de détection de matériau étranger destiné à une charge sans fil et appareil associé WO2018194409A1 (fr)

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KR20170050666 2017-04-19
KR1020170052176A KR102338396B1 (ko) 2017-04-19 2017-04-24 무선 충전을 위한 이물질 검출 방법 및 그를 위한 장치
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