WO2018004304A1 - Procédé de détection de matériau étranger, et dispositif et système associés - Google Patents

Procédé de détection de matériau étranger, et dispositif et système associés Download PDF

Info

Publication number
WO2018004304A1
WO2018004304A1 PCT/KR2017/006975 KR2017006975W WO2018004304A1 WO 2018004304 A1 WO2018004304 A1 WO 2018004304A1 KR 2017006975 W KR2017006975 W KR 2017006975W WO 2018004304 A1 WO2018004304 A1 WO 2018004304A1
Authority
WO
WIPO (PCT)
Prior art keywords
quality factor
value
wireless power
foreign matter
factor value
Prior art date
Application number
PCT/KR2017/006975
Other languages
English (en)
Korean (ko)
Inventor
박재희
권용일
Original Assignee
엘지이노텍(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020160083406A external-priority patent/KR20180003810A/ko
Priority claimed from KR1020160093483A external-priority patent/KR102576401B1/ko
Priority claimed from KR1020160095293A external-priority patent/KR102628358B1/ko
Priority to US16/314,559 priority Critical patent/US11070095B2/en
Application filed by 엘지이노텍(주) filed Critical 엘지이노텍(주)
Priority to JP2018567818A priority patent/JP2019526220A/ja
Priority to CN201780053470.6A priority patent/CN109952503B/zh
Priority to CN202211008315.1A priority patent/CN115603472A/zh
Priority to EP17820580.3A priority patent/EP3480588B1/fr
Priority to CN202211009592.4A priority patent/CN115603473A/zh
Publication of WO2018004304A1 publication Critical patent/WO2018004304A1/fr
Priority to US16/539,511 priority patent/US10916973B2/en
Priority to US17/318,000 priority patent/US11646607B2/en
Priority to JP2022142911A priority patent/JP2022172339A/ja
Priority to US18/298,896 priority patent/US20230275469A1/en
Priority to JP2023115056A priority patent/JP2023134642A/ja
Priority to JP2023118362A priority patent/JP2023134765A/ja
Priority to JP2023118414A priority patent/JP2023134770A/ja
Priority to JP2023118348A priority patent/JP2023134763A/ja
Priority to US18/356,047 priority patent/US20230361623A1/en
Priority to US18/355,896 priority patent/US20230361620A1/en
Priority to US18/356,050 priority patent/US20230369911A1/en
Priority to JP2023118335A priority patent/JP2023134761A/ja
Priority to JP2023118436A priority patent/JP2023134773A/ja
Priority to JP2023118350A priority patent/JP2023134764A/ja
Priority to US18/356,041 priority patent/US20230369910A1/en
Priority to JP2023118386A priority patent/JP2023134767A/ja
Priority to JP2023118343A priority patent/JP2023134762A/ja
Priority to US18/355,909 priority patent/US20230361622A1/en
Priority to US18/356,021 priority patent/US20230378819A1/en
Priority to US18/356,019 priority patent/US20230369909A1/en
Priority to JP2023118373A priority patent/JP2023134766A/ja
Priority to US18/355,998 priority patent/US20230369906A1/en
Priority to US18/355,898 priority patent/US20240030751A1/en
Priority to JP2023118417A priority patent/JP2023134771A/ja
Priority to JP2023118429A priority patent/JP2023134772A/ja
Priority to US18/356,028 priority patent/US20240006926A1/en
Priority to JP2023118332A priority patent/JP2023134760A/ja
Priority to US18/356,010 priority patent/US20230369908A1/en
Priority to JP2023118438A priority patent/JP2023139137A/ja
Priority to US18/355,891 priority patent/US20240030750A1/en
Priority to US18/355,944 priority patent/US20230369904A1/en
Priority to JP2023118458A priority patent/JP2023139139A/ja
Priority to US18/355,935 priority patent/US20230369903A1/en
Priority to JP2023118451A priority patent/JP2023139138A/ja
Priority to US18/355,929 priority patent/US20230369902A1/en
Priority to JP2023118326A priority patent/JP2023134759A/ja

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • 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
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

Definitions

  • the present invention relates to wireless power transmission technology, and more particularly, to a foreign material detection method on a wireless charging system, and an apparatus and system therefor.
  • 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. 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.
  • the FO may include a coin, a clip, a pin, a ballpoint pen, and the like.
  • the FO is present between the wireless power receiver and the wireless power transmitter, not only the wireless charging efficiency is significantly lowered but also the temperature of the wireless power receiver and the wireless power transmitter may rise together due to an increase in the ambient temperature of the FO. If the FO located in the charging area is not removed, not only power waste but also overheating may cause damage to the wireless power transmitter and the wireless power receiver.
  • 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 wirelessly enable the detection of foreign matter more accurately by determining a threshold value or threshold range for dynamically detecting foreign matter by reflecting a weight determined linearly or exponentially according to a reference quality factor value. It is to provide a transmitting device.
  • Another object of the present invention is to provide a wireless power transmission apparatus capable of detecting a foreign matter based on the quality factor value and inductance value of the resonant circuit measured before the ping step.
  • Another object of the present invention is to provide a wireless power transmitter capable of detecting a foreign matter based on a quality factor average value measured corresponding to a specific frequency in an operating frequency band.
  • the present invention can provide a foreign matter detection method and apparatus and system therefor.
  • a method for detecting foreign matter in a wireless power transmitter having a resonant circuit for transmitting power wirelessly includes detecting an object disposed in a charging region and, when the object is detected, Measuring a quality factor value, transmitting a detection signal to identify a wireless power receiver, determining a threshold for foreign material detection based on a reference quality factor value received from the identified wireless power receiver and measuring And comparing the determined quality factor value with the determined threshold value to determine whether a foreign substance exists, and the threshold value may be determined by applying a weight that increases according to the reference quality factor value.
  • the weight may be increased linearly or exponentially according to the reference quality factor value.
  • a configuration factor corresponding to the wireless power transmitter and a predefined tolerance are further applied to the determination of the threshold value, wherein the threshold value is obtained by adding the tolerance to a value multiplied by the reference quality factor value and the configuration factor. It may then be determined by subtracting the weight.
  • the foreign matter detection method may further include initiating charging to the identified wireless power receiver if there is no foreign matter and stopping the transmission of power through the resonant circuit if foreign matter exists.
  • the method may further include outputting a predetermined alarm signal indicating that the foreign matter is detected.
  • the process may return to the step of detecting an object disposed in the charging region.
  • the foreign matter detection method may further include determining whether the detected foreign matter has been removed from the charging region by comparing the quality factor value of the resonance circuit measured after the regression with the determined threshold value. .
  • the interrupted power transmission may be resumed.
  • the reference quality factor value may be included in the foreign matter detection status packet received in the negotiation step.
  • the determining of the presence or absence of the foreign matter may include determining that there is no foreign matter when the measured quality factor value exceeds the threshold value, and when the measured quality factor value is less than the threshold value, the foreign matter exists. And determining to do.
  • a method for detecting a foreign substance in a wireless power transmitter having a resonant circuit for wirelessly transmitting power includes detecting an object disposed in a charging region, and when the object is detected, the resonant circuit. Measuring a quality factor value of the signal, transmitting a detection signal to identify a wireless power receiver, and determining a threshold range for foreign material detection based on a reference quality factor value received from the identified wireless power receiver. And comparing the measured quality factor value with the determined threshold range to determine whether there is a foreign substance, and the threshold range may be determined by applying an upper limit weight and a lower limit weight that increase according to the reference quality factor value.
  • a foreign material detecting device includes a resonant circuit including a resonant capacitor and a resonant inductor, a sensing unit for detecting an object disposed in a charging region, and a value of a quality factor of the resonant circuit when the object is detected. Determining a threshold value for the foreign matter detection based on the reference quality factor value of the foreign matter detection status packet received from the measuring unit and the identified wireless power receiver, and compares the measured quality factor value and the determined threshold value The controller may include determining a presence of a foreign substance, and the threshold may be determined by applying a weight that increases according to the reference quality factor value.
  • the weight increases linearly or exponentially according to the reference quality factor value
  • the threshold value is a tolerance value that is predefined by multiplying the reference quality factor value by a configuration factor corresponding to the wireless power transmitter. In addition, it may be determined by subtracting the weight.
  • the controller when it is determined that the foreign matter does not exist, the controller starts charging to the identified wireless power receiver, and when it is determined that the foreign matter exists, the controller stops power transmission through the resonance circuit.
  • the controller may be configured to output a predetermined alarm signal indicating that the foreign matter is detected.
  • the controller may check whether the detected foreign matter is removed from the charging region by comparing the quality factor value of the resonant circuit measured by returning to the selection step after the power transmission stops with the determined threshold value.
  • the controller may control to resume the interrupted power transmission.
  • the foreign matter detection apparatus may further include a DC-DC converter for converting DC power applied from a power source into a specific DC power, and an inverter for converting the converted DC power into AC power.
  • a DC-DC converter for converting DC power applied from a power source into a specific DC power
  • an inverter for converting the converted DC power into AC power.
  • the measurement unit may measure the quality factor value of the resonant circuit based on the voltage measured across the resonant capacitor.
  • a foreign material detecting device includes a resonant circuit including a resonant capacitor and a resonant inductor, a sensing unit for detecting an object disposed in a charging region, and a value of a quality factor of the resonant circuit when the object is detected. Determining a threshold range for the foreign material detection based on the reference quality factor value of the foreign matter detection status packet received from the measuring unit and the identified wireless power receiver, and compares the measured quality factor value and the determined threshold range And a controller for determining whether a foreign substance exists, and the threshold range may be determined by applying an upper limit weight and a lower limit weight that increase according to the reference quality factor value.
  • a foreign material detection method in a wireless power transmitter having a resonant circuit for transmitting power wirelessly includes measuring a first inductance value of the resonant circuit and a foreign matter detection state packet from a wireless power receiver. And determining a threshold for detecting a foreign matter based on the foreign matter detection status packet and comparing the measured first inductance value with the determined threshold.
  • a threshold for detecting a foreign matter based on the foreign matter detection status packet and comparing the measured first inductance value with the determined threshold.
  • the foreign matter detection method may further include detecting an object disposed in a charging region and identifying the wireless power receiver, wherein the measured first inductance value of the resonant circuit is changed by the detected object. It may include an inductance value.
  • the first inductance value may be measured after the object is detected and before entering the step of identifying the wireless power receiver.
  • the foreign matter detection method may further include measuring a quality factor value of the resonant circuit after the object is detected and before entering the step of identifying the wireless power receiver.
  • the foreign matter detection method may further include stopping power transmission to the wireless power receiver based on a determination result of the presence of the foreign matter.
  • the foreign matter detection method may further include correcting power transmitted to the identified wireless power receiver based on a determination result of the presence of the foreign matter.
  • the foreign matter detection method may further include the step of outputting an alarm signal indicating that the foreign matter is detected based on the determination result of the presence of the foreign matter.
  • the foreign matter detection method may further include detecting an object disposed in the charging area after the power transmission stops.
  • the foreign matter detection method may further include measuring a second inductance value of the resonant circuit after the power transmission stops, comparing the measured second inductance value with the determined threshold value, and detecting the detected value in the charging region of the foreign matter.
  • the method may further include determining whether to remove.
  • the foreign matter detection status packet may include at least one of a reference quality factor value and a reference inductance value.
  • the reference inductance value may include an inductance value of the resonant circuit measured when the wireless power receiver is located in the charging region in the absence of foreign matter.
  • the foreign matter detection status packet may further include a mode field, and the mode field may include a first mode indicating that the foreign matter detection status packet includes the reference inductance value.
  • the foreign matter detection status packet further includes a mode field, and the mode field includes a second mode indicating that the foreign matter detection status packet includes the reference inductance value and the reference quality factor value. can do.
  • the determined threshold value includes a quality factor threshold value and an inductance threshold value, wherein the quality factor threshold value and the inductance threshold value are smaller than a predetermined ratio for each of the reference quality factor value and the reference inductance value. It may include.
  • the determined threshold value may include a value as large as a predetermined ratio with respect to the reference inductance value.
  • the foreign matter detection method may further include receiving a received power strength packet for correcting the power from the wireless power receiver, wherein the received power strength packet is received power of the wireless power receiver corresponding to a light load or It may include the received power of the wireless power receiver corresponding to the load connection state.
  • the determining of the presence or absence of the foreign matter may include determining a first foreign matter and determining the presence of the foreign matter by comparing the measured quality factor value with the quality factor threshold value, and the measured first inductance value and the inductance threshold. Comparing the value may include a second foreign matter determination step of determining the presence of foreign matter.
  • the foreign matter detection apparatus receives from a wireless power receiver and a measurement unit for measuring a resonant circuit including a resonant capacitor and an inductor, a charging region disposed on the inductor, and a first inductance value of the resonant circuit.
  • the controller may be configured to determine a threshold for detecting the foreign matter based on the detected foreign matter detection state packet, and determine whether the foreign matter is present by comparing the measured first inductance value with the determined threshold value.
  • the controller may be configured to detect an object located in the charging region, and the measured first inductance value may include an inductance value of the resonance circuit changed by the sensed object.
  • the measuring unit may be set to measure a quality factor value of the resonant circuit, and the measured quality factor value may include a quality factor value of the resonant circuit changed by the sensed object.
  • the inductance value of the resonant circuit may include an inductance value of the inductor.
  • the controller may correct power transmitted to the wireless power receiver.
  • the controller may control to stop power transmission to the wireless power receiver.
  • the foreign matter detection status packet may include at least one of a reference quality factor value and a reference inductance value.
  • the foreign matter detection status packet may further include a mode field, and the mode field may include a first mode indicating that the foreign matter detection status packet includes the reference inductance value.
  • the foreign matter detection status packet further includes a mode field, and the mode field includes a second mode indicating that the foreign matter detection status packet includes the reference inductance value and the reference quality factor value. can do.
  • the determined threshold value includes a quality factor threshold value and an inductance threshold value, wherein the quality factor threshold value and the inductance threshold value are smaller than a predetermined ratio for each of the reference quality factor value and the reference inductance value, respectively. May contain a value.
  • the determined threshold value may include a value as large as a predetermined ratio with respect to the reference inductance value.
  • the control unit may further determine whether there is a foreign matter by comparing the measured quality factor value with the quality factor threshold value to determine whether there is a foreign matter and comparing the measured inductance value with the inductance threshold value.
  • the second foreign matter determination can be performed.
  • the controller may finally determine that the foreign matter exists.
  • the foreign matter detection apparatus may further include a DC-DC converter for converting DC power applied from a power source into a specific DC power, and an inverter for converting the converted DC power into AC power.
  • a DC-DC converter for converting DC power applied from a power source into a specific DC power
  • an inverter for converting the converted DC power into AC power.
  • the measurement unit may measure the first inductance value based on at least one of voltage, current, and impedance measured at both ends of the resonant capacitor.
  • the measuring unit may include a quality factor measuring unit calculating the quality factor value based on the voltage measured across the resonance capacitor, and an inductance measuring unit calculating the inductance value based on the voltage and current measured across the inductor. can do.
  • the foreign material detection method in a wireless power transmitter comprises the steps of measuring a first quality factor value for one frequency, a second quality factor value for a second frequency and the first quality And determining the presence state of the foreign matter on the filled region based on the factor value and the second quality factor value.
  • the second frequency is greater than the first frequency and the second quality factor value is greater than the first quality factor value, it may be determined that foreign matter exists in the charging region.
  • the second quality factor value when the second quality factor value is greater than the first quality factor value, it may be determined that there is a wireless power receiver that is not aligned in the charging region.
  • the foreign matter detection method may further include transmitting wireless power according to the determined presence state of the foreign matter, and the foreign matter presence state may include a foreign matter present state and a foreign matter present state.
  • the foreign matter present state may include a state in which the second quality factor value is greater than the first quality factor value.
  • the foreign matter-free state may include a state in which the second quality factor value is less than or equal to the first quality factor value.
  • the foreign matter detection method may further include outputting a predetermined alarm signal when the presence of the foreign matter is detected in the charging region as a result of the determination.
  • the foreign matter detection method may further include the step of suspending the power transmission, when the presence of the foreign matter is detected, the power transmission.
  • the foreign matter detection method may further include checking whether the detected foreign matter has been removed from the charging region while the power transmission is suspended, and when the detected foreign matter is removed, suspending the foreign matter. Power transmission can be resumed.
  • the foreign matter detection method may further include the step of entering the selection step after the alarm signal output.
  • the foreign matter detection method further comprises the step of confirming that the detected foreign matter is removed from the charging area before entering the selection step after the output of the notification signal, if the foreign matter is removed, the selection You can enter the steps.
  • the value obtained by subtracting the first quality factor value from the second quality factor value exceeds a predetermined reference value, it may be determined that foreign matter exists in the filling region.
  • the foreign material detection method in the wireless power transmitter is to calculate a first quality factor average value corresponding to a predetermined upper limit frequency band in the operating frequency band and to the predetermined lower limit frequency band in the operating frequency band. Calculating a corresponding second quality factor average value and determining whether foreign matter exists in a charging region of the wireless power transmitter based on the first quality factor average value and the second quality factor average value. have.
  • the first quality factor average value is greater than the second quality factor average value, it may be determined that foreign matter exists in the filling region.
  • the value obtained by subtracting the second quality factor average value from the first quality factor average value exceeds a predetermined reference value, it may be determined that foreign matter exists in the filling region.
  • the foreign matter detection apparatus measures a first quality factor value for a first frequency in a preset operating frequency band, and measures a second quality factor for a second frequency in the operating frequency band. It may include a quality factor measuring unit for measuring a second quality factor value and a detector for determining whether there is a foreign material in the filling region based on the first quality factor value and the second quality factor value.
  • the detector may determine that a foreign material exists in the charging region.
  • the detector determines that there is a wireless power receiver that is not aligned with the charging region. You may.
  • the foreign matter detection apparatus may further include an alarm unit configured to output a predetermined alarm signal when the presence of the foreign matter is detected in the charging area.
  • the foreign matter detection device may further include a control unit for suspending the power transmission when the presence of the foreign matter is detected, the power transmission.
  • the controller may determine whether the detected foreign matter is removed from the charging region while the power transmission is suspended, and when the detected foreign matter is removed, resume the suspended power transmission. have.
  • controller may control to enter the selection step after the alarm signal output.
  • the controller may check whether the detected foreign matter is removed from the charging area after the notification signal is output and before entering the selection step, and control to enter the selection step when the foreign matter is removed as a result of the checking. have.
  • the detector determines that the foreign matter exists in the charging region. can do.
  • the foreign matter detection apparatus provided in the wireless power transmitter is a quality factor measuring unit for measuring a quality factor value in a predetermined operating frequency band and measured in correspondence to a predetermined upper limit frequency band in the operating frequency band A first quality factor average value is calculated based on the at least one quality factor value, and a second quality factor average value is calculated based on the at least one quality factor value measured corresponding to a predetermined lower limit frequency band in the operating frequency band.
  • the calculator may include an average calculator configured to calculate a value, and a detector configured to determine whether foreign matter exists in a charging region of the wireless power transmitter based on the first quality factor average value and the second quality factor average value.
  • the detector may determine that the foreign matter exists in the filling region.
  • the detector may determine that foreign matter exists in the filling region.
  • 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.
  • the present invention has the advantage of minimizing unnecessary power waste and heat generation by foreign matter.
  • the present invention is a wireless power transmission that can detect the foreign matter more accurately by determining the threshold value or threshold range for detecting the foreign matter dynamically by reflecting the weight determined linearly or exponentially according to the reference quality factor value.
  • the present invention is to provide a wireless power transmission apparatus capable of detecting the foreign matter based on the quality factor value and the inductance value of the resonant circuit measured before the ping step.
  • the present invention measures the inductance value as well as the quality factor value of the resonant circuit before the ping step and compares the measured value with the threshold value determined based on the FOD status packet in the negotiation step. It is an advantage to provide a foreign matter detection method and apparatus and system therefor that are capable of detecting foreign matter.
  • the present invention has an advantage of providing a foreign matter detection method and an apparatus and system using the same by detecting a threshold value for determining whether there is a foreign matter dynamically according to the type of the receiver.
  • the present invention has the advantage of providing a wireless power transmitter capable of detecting the foreign matter based on the quality factor value measured corresponding to a specific frequency in the operating frequency band.
  • the present invention has the advantage of providing a wireless power transmitter capable of detecting the foreign matter based on the quality factor average value measured corresponding to a specific frequency in the operating frequency band.
  • the present invention not only has the advantage of minimizing the foreign matter detection error, it can be expected to minimize the unnecessary power waste and equipment damage through this.
  • FIG. 1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
  • FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a structure of a wireless power receiver interworking with a wireless power transmitter.
  • FIG. 4 is a diagram illustrating a packet format according to an embodiment of the present invention.
  • 5 is a view for explaining the type of packet according to an embodiment of the present invention.
  • 6A is a block diagram illustrating a structure of a foreign matter detection apparatus according to an embodiment of the present invention.
  • 6B is a block diagram illustrating a structure of a foreign matter detection apparatus according to another embodiment of the present invention.
  • FIG. 7A illustrates a message structure of a foreign object detection status packet according to an embodiment of the present invention.
  • FIG. 7B is a diagram for explaining a message structure of a FOD status packet according to an embodiment of the present invention.
  • 7C is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • FIG. 8A is a view for explaining a state transition procedure for detecting a foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • 8B is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • 9A is a flowchart illustrating a foreign material detection method in a wireless power transmission apparatus according to another embodiment of the present invention.
  • 9B is a flowchart illustrating a foreign material detection method in a wireless power transmission apparatus according to another embodiment of the present invention.
  • 10 and 11 are graphs showing experimental results showing a drop in quality recognition value compared to a reference quality factor value for each receiver type when a foreign material is disposed in a charging region according to an embodiment of the present invention.
  • FIG. 13A is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • 13B is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • 13C is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • 13D to 13G illustrate a message structure of a FOD status packet according to an embodiment of the present invention.
  • FIG. 14 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • 15 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • FIG. 16 shows a quality factor table according to an embodiment of the present invention.
  • FIG. 17 is a block diagram illustrating a configuration of an FO detection apparatus according to an embodiment of the present invention.
  • FIG. 18 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • FIG. 19 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • FIG. 20 is a flowchart illustrating a FO detection method based on a quality factor value according to an embodiment of the present invention.
  • FIG. 21 is a block diagram illustrating a structure of an FO detection apparatus corresponding to the embodiment of FIG. 20.
  • FIG. 22 is a flowchart illustrating a method of detecting FO based on a quality factor value according to another embodiment of the present invention.
  • FIG. 23 is a block diagram illustrating a structure of an FO detection apparatus corresponding to the embodiment of FIG. 22.
  • 24A to 24E are graphs of experimental results for explaining the logical basis of the embodiments of FIGS. 14 to 23.
  • FIG. 25 is a diagram illustrating a relationship between a quality factor value and a maximum quality factor peak frequency according to the arrangement of a wireless power receiver and a foreign object in a charging region of the wireless power transmitter.
  • FIG. 26 is a view for explaining a state transition procedure for detecting a foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • FIG. 27 is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • FIG. 28 is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • 29 is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • FIG. 30 is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • a foreign material detection method in a wireless power transmitter having a resonant circuit for transmitting power wirelessly includes detecting an object disposed in a charging region and, when the object is detected, a quality factor value of the resonant circuit. Determining a threshold for detecting foreign matter based on a reference quality factor value received from the identified wireless power receiver; And comparing the determined threshold value with a value to determine whether a foreign substance exists, and the threshold value may be determined by applying a weight that increases according to the reference quality factor value.
  • 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 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 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 receiver 20 modulates the received power signal and modulates the received signal. 42 may be transmitted to the wireless power transmitter 10.
  • 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 in-band communication and the out-of-band communication may provide bidirectional communication, but are not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may provide one-way communication or half-duplex communication.
  • the unidirectional communication may be performed by the wireless power receiver 20 only transmitting information to the wireless power transmitter 10, but is not limited thereto.
  • the wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.
  • bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.
  • 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 transmit a predetermined packet indicating whether to support fast charging to the wireless power receiver 20.
  • the wireless power receiver 20 may notify the electronic device 30 when it is determined that the connected wireless power transmitter 10 supports the fast charging mode.
  • the electronic device 30 may indicate that fast charging is possible through predetermined display means provided, for example, it may be a liquid crystal display.
  • the user of the electronic device 30 may control the wireless power transmitter 10 to operate in the fast charge mode by selecting a predetermined fast charge request button displayed on the liquid crystal display.
  • the electronic device 30 may transmit a predetermined quick charge request signal to the wireless power receiver 20.
  • the wireless power receiver 20 may convert the normal low power charging mode into the fast charging mode by generating a charging mode packet corresponding to the received fast charging request signal to the wireless power transmitter 10.
  • FIG. 2 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
  • power transmission from a transmitter to a receiver is largely selected in a selection phase 210, a ping phase 220, an identification and configuration phase 230, and a negotiation phase.
  • Phase 240 Phase 240
  • a calibration phase 250 phase 250
  • a power transfer phase 260 phase 260
  • a renegotiation phase 270 phase 270
  • 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, it may transition to ping step 220. In the selection step 210, the transmitter transmits a very short pulse of an analog ping signal and an object in the active area of the interface surface based on the current change of the transmitting coil or the primary coil. Can detect the presence of
  • ping step 220 when an object is detected, 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 in ping step 220 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 210. In addition, in the ping step 220, when the transmitter receives a signal indicating that the power transmission is completed, that is, a charging completion packet, the transmitter may transition to the selection step 210.
  • a response signal eg, a signal strength packet
  • the transmitter may transition to the identification and configuration step 230 for identifying the receiver and collecting receiver configuration and status information.
  • 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 selection step 210.
  • the transmitter may determine whether entry into the negotiation step 240 is necessary based on a negotiation field value of the configuration packet received in the identification and configuration step 230.
  • the transmitter may enter a negotiation step 240 to perform a predetermined FOD detection procedure.
  • the transmitter may immediately enter the power transmission step 260.
  • the transmitter may receive a Foreign Object Detection (FOD) status packet including a reference quality factor value.
  • FOD Foreign Object Detection
  • the transmitter may determine a threshold for FO detection based on the reference quality factor value.
  • the transmitter may determine a threshold value or a threshold range for determining the presence of a foreign substance by using a predetermined threshold generation function having a reference quality factor value as a parameter.
  • the threshold value or threshold range calculated by the threshold generation function is a value smaller than the reference quality factor value.
  • the threshold value FO_Threshold for detecting the foreign matter is based on a reference quality factor value RQF_Value, a preset configuration factor Design_factor corresponding to the corresponding wireless power transmitter, a tolerance and weight defined in the standard. Can be determined based on this.
  • the weight may be increased linearly or exponentially according to the reference quality factor value. That is, the threshold for the detection of foreign substances is the following formula 1:
  • the quality factor value measured in the resonant circuit of the transmitter is lower than before the foreign matter is placed.
  • the ratio of the measured quality factor value to the reference quality factor value is reduced by the type of receiver placed in the charging area, that is, the reference quality factor value of the corresponding wireless power receiver. It may differ according to.
  • the larger the reference quality factor value is characterized in that the rate of decrease of the quality factor value according to the foreign matter batch is sharply higher.
  • the transmitter according to the present invention may determine the threshold value (or threshold range) such that the ratio of the threshold value for detecting the foreign matter to the reference quality factor value is lower as the wireless power receiver having a larger reference quality factor value. Through this, the probability that the transmitter fails to detect the foreign matter may be lowered.
  • the transmitter may determine whether the FO exists in the charging region by comparing the quality factor value measured after the object detection and the threshold value determined for FO detection, and may control power transmission according to the FO detection result. For example, when the FO is detected, the transmitter may stop power transmission and output a predetermined warning alarm indicating that the FO is detected.
  • the transmitter can return to selection step 210.
  • the transmitter may enter the power transmission step 260 via the correction step 250.
  • the transmitter determines the strength of the power received at the receiving end in the correction step 250, and determines the power loss at the receiving end and the transmitting end to determine the strength of the power transmitted by the transmitting end. It can be measured. That is, the transmitter may predict the power loss based on the difference between the transmit power of the transmitter and the receive power of the receiver in the correction step 250.
  • the transmitter may correct the threshold for FOD detection by reflecting the predicted power loss.
  • 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 complete, then transition to selection step 210.
  • the transmitter may transition to renegotiation step 270 if it is necessary to reconfigure the power transmission contract according to a change in transmitter status. At this time, if the renegotiation is normally completed, the transmitter may return to the power transmission step (260).
  • 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.
  • FIG. 3 is a block diagram illustrating a structure of a wireless power receiver interworking with a wireless power transmitter.
  • the wireless power receiver 300 includes a receiving coil 310, a rectifier 320, a DC / DC converter 330, a load 340, a sensing unit 350, and a communication unit ( 360, the main control unit 370 may be configured.
  • the communicator 360 may include at least one of a demodulator 361 and a modulator 362.
  • the wireless power receiver 300 illustrated in the example of FIG. 3 is illustrated as being capable of exchanging information with the wireless power transmitter 600 through in-band communication, this is only one embodiment.
  • the communication unit 360 according to another exemplary embodiment of the present invention may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.
  • AC power received through the receiving coil 310 may be transferred to the rectifier 320.
  • the rectifier 320 may convert AC power into DC power and transmit the DC power to the DC / DC converter 330.
  • the DC / DC converter 330 may convert the strength of the rectifier output DC power into a specific intensity required by the load 340 and then transmit the converted power to the load 340.
  • the sensing unit 350 may measure the intensity of the rectifier 320 output DC power and provide the same to the main controller 370. In addition, the sensing unit 350 may measure the strength of the current applied to the receiving coil 310 according to the wireless power reception, and may transmit the measurement result to the main control unit 370. In addition, the sensing unit 350 may measure the internal temperature of the wireless power receiver 300 and provide the measured temperature value to the main controller 370.
  • the main controller 370 may determine whether the overvoltage is generated by comparing the measured intensity of the rectifier output DC power with a predetermined reference value. As a result of the determination, when the overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 362.
  • the signal modulated by the modulator 362 may be transmitted to the wireless power transmitter 600 through the receiving coil 310 or a separate coil (not shown).
  • the main controller 370 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. When the sensing signal is received, a signal strength indicator corresponding to the sensing signal may be modulated by the modulator 362.
  • the demodulator 361 demodulates an AC power signal or a rectifier 320 output DC power signal between the receiving coil 310 and the rectifier 320 to identify whether a detection signal is received, and then, the demodulator 382 may control the identification result.
  • the unit 370 may be provided. In this case, the main controller 370 may control the signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 362.
  • FIG. 4 is a diagram illustrating a packet format according to an embodiment of the present invention.
  • the packet format 400 used for exchanging information between the wireless power transmitter 10 and the wireless power receiver 20 may be used to obtain synchronization for demodulating the packet and to identify the correct start bit of the packet.
  • the packet receiver may identify the size of the message 430 included in the packet based on the header 420 value.
  • the header 420 may be defined in each step of the wireless power transfer procedure, and in part, the header 420 value may be defined to have the same value in different steps of the wireless power transfer procedure.
  • the header values corresponding to the end power transfer of the ping step and the end of the power transfer of the power transfer step may be equal to 0x02.
  • the message 430 includes data to be transmitted at the transmitting end of the packet.
  • the data included in the message 430 field may be a report, a request, or a response to the counterpart, but is not limited thereto.
  • Packet 400 may further include at least one of the transmitter identification information for identifying the transmitting end that transmitted the packet, the receiver identification information for identifying the receiving end to receive 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 400 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. 5 is a diagram for describing types of packets transmitted from a wireless power receiver to a wireless power transmitter according to an embodiment of the present invention.
  • a packet transmitted from a wireless power receiver to a wireless power transmitter is a signal strength packet for transmitting strength information of a detected ping signal, a type of power transmission for requesting the transmitter to stop power transmission.
  • End Power Transfer a power control hold-off packet for transmitting time information waiting to adjust the actual power after receiving a control error packet for control control
  • a configuration for transmitting the configuration information of the receiver Packet, identification packet and extended identification packet for transmitting receiver identification information general request packet for sending general request message, special request packet for sending special request message, reference quality factor value for FO detection FOD status packet, control error packet for controlling the transmitter power of the transmitter, renegotiation packet for initiation of renegotiation,
  • a 24-bit received power packet and 8-bit received power packet for transmitting strength information of the received power, and a charging state packet for transmitting charge state information of a current load may be included.
  • Packets transmitted from the wireless power receiver to the wireless power transmitter may be transmitted using in-band communication using the same frequency band as the frequency band used for wireless power transmission.
  • 6A is a block diagram illustrating a structure of a foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus 600 may include a power supply unit 601, a DC-DC converter 610, an inverter 620, a resonance circuit 630, a measurement unit 640, The communication unit 660, the sensing unit 670, and the controller 680 may be configured to be included.
  • the foreign matter detection apparatus 600 according to the present embodiment may be mounted in a wireless power transmission apparatus.
  • the resonant circuit 630 may include a resonant capacitor 631 and a resonant inductor 632, and the communicator 660 may include at least one of a demodulator 661 and a modulator 662.
  • the power supply unit 601 may receive DC power through an external power supply terminal and transmit the DC power to the DC-DC converter 610.
  • the DC-DC converter 610 may convert the intensity of the DC power input from the power supply unit 601 into the DC power of a specific intensity under the control of the controller 680.
  • the DC-DC converter 610 may be configured as a variable voltage device capable of adjusting the strength of the voltage, but is not limited thereto.
  • the inverter 620 may convert the converted DC power into AC power.
  • the inverter 620 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 620 may be configured to include a full bridge circuit, but is not limited thereto.
  • the inverter 620 may be configured to include a half bridge.
  • the inverter 620 may include both a half bridge circuit and a full bridge circuit.
  • the controller 680 may operate the inverter 620 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 620 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 680 may control the inverter 620 to operate in the half bridge mode.
  • the controller 680 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 620 according to the determined bridge mode. For example, when the temperature of the wireless power transmitter exceeds a predetermined reference value while transmitting wireless power through the half bridge mode, the controller 680 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 630 for power transmission 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 620 may not only convert DC power into AC power but also change the strength of the AC power.
  • the inverter 620 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 680.
  • the inverter 620 may be configured to include a frequency oscillator for generating a reference AC signal having a specific frequency, which is just one embodiment, another example is that the frequency oscillator is separate from the inverter 620 Is configured to be mounted on one side of the foreign matter detection device 600.
  • the foreign matter detection apparatus 600 may further include a gate driver (not shown) for controlling a switch provided in the inverter 620.
  • the gate driver may receive at least one pulse width modulated signal from the controller 680 and control the switch of the inverter 620 according to the received pulse width modulated signal.
  • the controller 680 may control the intensity of the output power of the inverter 620 by controlling the duty cycle of the pulse width modulated signal, that is, the duty rate and the phase.
  • the controller 680 may adaptively control the duty cycle and the phase of the pulse width modulated signal based on the feedback signal received from the wireless power receiver.
  • the measurement unit 640 calculates a quality factor value and / or inductance value for the resonance circuit 630 by measuring at least one of voltage, current, and impedance across the resonance capacitor 631 according to the control signal of the control unit 680. can do.
  • the calculated quality factor value and / or inductance value may be transmitted to the controller 680, and the controller 680 may temporarily store the quality factor value and / or inductance value received from the measurement unit 640 in a predetermined recording area. have. For example, if an object is detected on the charging area in the selection step, the controller 680 may control the measurement unit 640 to calculate the quality factor value and / or inductance value before entering the ping step.
  • the controller 680 may determine a threshold (or threshold range) for determining whether a foreign object exists based on the information included in the FOD status packet.
  • the threshold value FO_Threshold for detecting the foreign matter is based on a reference quality factor value RQF_Value, a preset configuration factor Design_factor corresponding to the corresponding wireless power transmitter, a tolerance and weight defined in the standard. Can be determined based on this.
  • the weight may be increased linearly or exponentially according to the reference quality factor value. That is, the controller 680 is the following formula 1:
  • the weight may be calculated by a predetermined linear function having a reference quality factor value as a parameter, but is not limited thereto and may be calculated by a higher or higher order function.
  • the weight may be predefined for each type of wireless power receiver to be recorded and maintained in a predetermined recording area of the foreign matter detection apparatus 600 (eg, nonvolatile memory).
  • the weight for each wireless power receiver type may be maintained in the form of a mapping table, but is not limited thereto.
  • the threshold range for detecting the foreign matter is identified by an upper limit threshold (FO_Theshold_Upper_Limit) and a lower limit threshold (FO_Theshold_Lower_Limit), and includes a reference quality factor value (RQF_Value) and a preset configuration factor corresponding to the corresponding wireless power transmitter.
  • Design_factor a tolerance defined in the standard, an upper limit weight, and a lower limit weight may be determined.
  • the upper limit weight and the lower limit weight may be increased linearly or exponentially according to the reference quality factor value. That is, the controller 680 is the following formula 2:
  • FO_Threshold_Upper_Limit (RQF_Value * Design_factor) + tolerance-upper weight
  • FO_Threshold_Lower_Limit (RQF_Value * Design_factor) + tolerance-lower limit weight (Equation 2)
  • the controller 680 may determine that there is a foreign substance.
  • the threshold value FO_Threshold for detecting foreign matter according to another embodiment of the present invention may be determined by differentially applying a ratio according to the size of a reference quality factor (RQF) value, as shown in Table 1 below.
  • RQF reference quality factor
  • RQFx0 when the reference quality factor (RQF) value exceeds 80, a Diff Ratio is applied as 40%, and the threshold value (FO_Threshold) for detecting foreign matters is RQFx0. It can be calculated as 6 + tolerance.
  • RQF reference quality factor
  • Diff Ratio difference ratio
  • FO_Threshold threshold value
  • RQF Reference Quality Factor
  • the wireless power transmitter receives the reference quality factor value through the FOD status packet in the negotiation step, and may adaptively determine the FO_Threshold according to the received reference quality factor value.
  • Table 1 As shown in Table 1, as the RQF value increases, a difference value between the RQF value and the FO_Threshold increases with a difference ratio corresponding to the corresponding RQF value. On the other hand, as the RQF value decreases, the difference between the RQF value and the FO_Threshold decreases according to the difference ratio corresponding to the corresponding RQF value. It should be noted that the above Table 1 is only one embodiment and that the differential ratio according to the RQF value may be determined differently according to the design of the person skilled in the art and the configuration of the device.
  • the quality factor value measured in the resonant circuit of the transmitter is lower than before the foreign matter is placed.
  • the ratio of the measured quality factor value to the reference quality factor value is reduced by the type of receiver placed in the charging area, that is, the reference quality factor value of the corresponding wireless power receiver. It may differ according to.
  • the controller 680 may determine a threshold value (or threshold range) such that the ratio of the threshold value for detecting the foreign matter to the reference quality factor value is lower as the wireless power receiver having the larger reference quality factor value. Through this, the probability that the transmitter fails to detect the foreign matter may be lowered.
  • the controller 680 may determine whether the FO exists in the charging area by comparing the quality factor value measured after the object detection and the threshold value determined for FO detection, and may control power transmission according to the FO detection result.
  • the control unit 680 may stop the power transmission, and may control to output a predetermined warning alarm indicating that the FO is detected.
  • the warning alarm may be output through at least one of a beeper, an LED lamp, a vibrating element, and a liquid crystal display provided in the foreign matter detection apparatus 600, but is not limited thereto.
  • the controller 680 may determine that there is a foreign substance in the charging region when the quality factor value measured before the object is detected in the selection step and before entering the ping step is smaller than the determined threshold value.
  • the controller 680 may determine that there is a foreign substance in the charging region when the quality factor value measured before the object sensing in the selection step and before entering the ping step is included in the determined threshold range.
  • the reference quality factor value included in the FOD status packet may be determined as the smallest value among the quality factor values calculated corresponding to the corresponding wireless power receiver at a specific position of the charging bed of the wireless power transmitter designated for the standard performance test.
  • control unit 680 returns to the selection step and controls the measurement unit 640 to calculate the quality factor value of the resonance circuit 630 at a predetermined period.
  • the controller 680 may determine whether the previously detected foreign matter has been removed from the charging area by comparing the quality factor value acquired in the state where the foreign matter is detected with a predetermined threshold value (or threshold range).
  • the controller 680 may determine that the foreign substance has been removed when the quality factor value measured in the state where the foreign substance is detected is greater than the predetermined threshold value. As another example, the controller 680 may determine that the foreign substance has been removed when the quality factor value measured in the state where the foreign substance is detected exceeds the upper limit threshold.
  • controller 680 may adaptively determine the threshold value for the detection of the foreign substance with reference to the business card, which is referred to as a "threshold value determination table" for convenience of description in Table 1 below.
  • Table 1 may be maintained in a predetermined recording area of a memory (not shown) provided in the foreign matter detection apparatus 680, and the control unit 680 receives a FOD status packet including a reference quality factor value in a negotiation step.
  • a threshold for detecting the foreign matter may be determined, and the presence of the foreign matter may be determined by comparing the determined threshold value with the previously measured quality factor value.
  • the threshold determination table may be updated.
  • the foreign matter detection apparatus may be connected to a specific server through a wired or wireless network, and may update the threshold determination table in association with the corresponding server.
  • the foreign matter detection apparatus may receive or update the threshold determination table from the connected wireless power receiver.
  • the threshold determination table may be generated for each type of the wireless power receiver, and the foreign matter detection apparatus may determine the threshold value for the foreign matter detection with reference to the threshold determination table corresponding to the identified type of the wireless power receiver.
  • a threshold determination table for each wireless power transmitter type may be maintained.
  • the wireless power receiver may transmit a threshold determination table corresponding to the identified type of wireless power transmitter to the corresponding wireless power transmitter.
  • the wireless power transmitter may determine a threshold for foreign material detection based on the received threshold determination table.
  • the foreign matter detection apparatus refers to a threshold determination table for adaptively detecting foreign matter by referring to a threshold value determination table corresponding to the type of the wireless power receiver and / or the type of the wireless power transmitter. The value can be determined.
  • the controller 680 may enter the power transmission step again and control the charging to the corresponding wireless power receiver to be resumed.
  • the threshold value may include an inductance threshold and a quality factor threshold. If the determined value is a threshold range, the threshold range may include an inductance threshold range and a quality factor threshold range. The two thresholds may be used together to detect the foreign matter, and the threshold value corresponding to the corresponding kind may be determined according to the type of the reference value sent from the receiver, respectively, and the foreign matter may be detected.
  • the FOD status packet may include a reference quality factor value and / or a reference inductance value corresponding to the corresponding wireless power receiver.
  • the controller 680 may determine a quality factor threshold and / or inductance threshold for determining whether a foreign substance exists based on the received reference quality factor value and the reference inductance value. For example, a value corresponding to 90% of the reference quality factor value and the reference inductance value may be determined as the quality factor threshold value and / or the inductance threshold value, but is not limited thereto.
  • the ratio may be defined differently according to the design of a person skilled in the art. Can be.
  • the controller 680 may determine that there is a foreign substance when the prestored quality factor value (measured before the ping step) is smaller than the determined quality factor threshold value or the prestored inductance value is smaller than the determined inductance threshold value. have.
  • the controller 680 may stop the power transmission and control a predetermined warning alarm indicating that the foreign matter is detected.
  • the notifying means may include, but is not limited to, a beeper, an LED lamp, a vibrating element, a liquid crystal display, and the like.
  • the reference quality factor value included in the FOD status packet may be determined as the smallest value among the quality factor values calculated corresponding to the corresponding wireless power receiver at a specific position of the charging bed of the designated wireless power transmitter.
  • the inductance value included in the FOD status packet may be determined as the smallest value among the inductance values calculated corresponding to the corresponding wireless power receiver at a specific position of the charging bed of the wireless power transmitter designated for the standard performance test.
  • the control unit 680 when the foreign matter is detected in the negotiation step, the control unit 680 returns to the selection step, and controls the measurement unit 640 to calculate the quality factor value and the inductance value of the resonance circuit 630 at predetermined intervals. In this case, the controller 680 may compare the quality factor value and the inductance value obtained while the foreign matter is detected with the predetermined quality factor threshold value and the inductance threshold value, respectively, to determine whether the previously detected foreign matter has been removed from the charging region. have. In a further embodiment, when the foreign matter is removed as a result of the determination, the controller 680 may enter the power transmission step and control the charging of the wireless power receiver to be resumed. At this time, it may enter the power transmission step by skipping the identification and setting step and / or negotiation step.
  • the demodulator 661 demodulates the in-band signal received from the wireless power receiver and transmits the demodulated in-band signal to the controller 680.
  • the demodulator 661 may demodulate the packet described with reference to FIG. 10 and transmit the demodulated packet to the controller 680.
  • the sensing unit 670 may measure voltage, current, power, impedance, temperature, etc. at a specific terminal, a specific device, a specific location, etc. of the foreign matter detection device 600 (or the wireless power transmitter).
  • the sensing unit 670 may measure the voltage / current of the DC-converted power and provide the same to the controller 680.
  • the sensing unit 670 may measure the internal temperature of the wireless power transmitter to determine whether overheating occurs, and provide the measurement result to the controller 680.
  • the controller 680 may adaptively block power supply from the power source or block power supply to the resonant circuit 630 based on the voltage / current value measured by the sensing unit 670.
  • one side of the foreign matter detection device 600 may be further provided with a predetermined power cut-off circuit for cutting off the power supplied from the power supply unit 601, or cut off the DC power supplied to the inverter 620.
  • the sensing unit 670 may further include a hall sensor, a pressure sensor, and the like. In this case, whether an object exists in the charging area may be detected through a hall sensor or a pressure sensor, but is not limited thereto.
  • the sensing unit 670 may detect whether an object exists in the charging area by detecting a change in current, voltage, impedance, etc. of the resonant circuit 630 while transmitting the analog ping signal in the selection step.
  • the foreign matter detection apparatus 600 measures (or calculates) the quality factor value of the resonant circuit before the entry into the ping step, when an object is detected in the selection step, and is determined in the negotiation step. By comparing the threshold value (or threshold range) with the measured quality factor value, it is possible to significantly reduce the probability of failing the foreign material detection by determining the presence of the foreign material.
  • the sensing unit may be replaced with the measuring unit and omitted.
  • the foreign matter detection apparatus 600 by dynamically determining a threshold (or threshold range) for the detection of foreign matter according to a reference quality factor value corresponding to the corresponding wireless power receiver, thereby optimized for the corresponding wireless power receiver. Foreign object detection can be performed.
  • FIG. 7A illustrates a message structure of a foreign object detection status packet according to an embodiment of the present invention.
  • the FOD status packet message 700 may have a length of 2 bytes, and a 6-bit reserved (701) field, a 2-bit mode (702) field, and a 1-byte length It may be configured to include a reference quality factor value (703) field of. Here, all bits of the reservation 701 field are recorded as zero.
  • the mode 702 field is set to binary '00'
  • the reference quality factor value measured and determined while the power of the corresponding wireless power receiver is turned off in the reference quality factor value 703 field is determined. This may mean that it has been recorded.
  • FIG. 7B is a diagram for explaining a message structure of a FOD status packet according to an embodiment of the present invention.
  • the FOD status packet message 700 may have a length of 2 bytes, the first data 701 field having a length of 6 bits, a mode 702 field having a length of 2 bits, and a length of 1 byte. It may be configured to include a reference quality factor value (703) field of.
  • the mode 702 field is set to binary '00', all bits of the first data 701 field are written as 0, corresponding to the reference quality factor value 703 field.
  • the reference quality factor value measured and determined while the power receiver is turned off is recorded.
  • the mode 702 field is set to binary '01', the reference inductance value measured and determined while the power of the corresponding wireless power receiver is turned off is recorded in the first data 701 field, and the reference quality factor value ( In the field 703, the reference quality factor value measured and determined while the power of the wireless power receiver is turned off is recorded.
  • the foreign matter detection apparatus may acquire at least one of a reference quality factor value and a reference inductance value corresponding to the corresponding wireless power receiver in the negotiation step.
  • 7C is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 700 may have a length of 2 bytes, a 6-bit reserved (701) field, a 2-bit mode (702) field, and a 1-byte length. It may be configured to include a reference value (Reference Value, 703) field of. Here, all bits of the reservation 701 field are recorded as '0'.
  • the reference value 703 field records the determined reference quality factor value measured and determined while the wireless power receiver is powered off. do.
  • the mode 702 field is set to binary '01'
  • the reference inductance value measured and determined while the power of the corresponding wireless power receiver is turned off is recorded in the reference value 703 field.
  • the foreign matter detection apparatus may acquire at least one of a reference quality factor value and a reference inductance value corresponding to the corresponding wireless power receiver in the negotiation step.
  • FIG. 8A is a view for explaining a state transition procedure for detecting a foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus may enter the ping step 820 after measuring and storing a quality factor value of the resonant circuit.
  • the foreign object detection device may periodically transmit a predetermined power signal, for example, a digital ping, to identify the wireless power receiver.
  • the apparatus When the foreign matter detection device receives a signal strength indicator corresponding to the digital ping in the ping step 820, the apparatus enters the identification and configuration step 830 to identify the wireless power receiver, and the various configuration parameters for the identified wireless power receiver. Can be set.
  • the foreign matter detection apparatus may enter a negotiation step 840 to receive a FOD status packet including a reference quality factor value.
  • the foreign matter detection apparatus determines a threshold (or threshold range) for determining the presence of foreign substances based on the reference quality factor value included in the FOD status packet, and compares the stored quality factor value with the determined threshold value (or threshold range). It is possible to determine whether foreign matter exists in the charging region.
  • the foreign matter detection apparatus may adaptively determine a threshold (or threshold range) for foreign matter detection according to a reference quality factor value received from the wireless power receiver.
  • the foreign matter detection device may stop the power transmission and return to the selection step 810.
  • the foreign matter detection apparatus may enter the power transmission step 850 and may initiate wireless charging for the wireless power receiver.
  • 8B is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus may enter the ping step 820 after measuring and storing the quality factor value and the inductance value of the resonant circuit.
  • the foreign object detection device may periodically transmit a predetermined power signal, for example, a digital ping, to identify the wireless power receiver.
  • the foreign matter detection apparatus may enter the identification and configuration step 830 to identify the wireless power receiver, and set various configuration parameters for the identified wireless power receiver.
  • the foreign matter detection apparatus may enter a negotiation step 840 to receive a FOD status packet including a reference quality factor value and / or a reference inductance value.
  • the foreign matter detection apparatus determines a threshold (or threshold range) for determining whether there is a foreign substance based on the reference value (s) included in the FOD status packet, and determines a threshold value (or threshold range) based on the determined threshold value (or threshold range). It is possible to determine whether foreign matter exists.
  • the foreign matter detection device may stop the power transmission and return to the selection step 810.
  • the foreign matter detection apparatus may enter the power transmission step 850 and may initiate wireless charging for the wireless power receiver.
  • the foreign matter detection apparatus may perform the correction step 250 as described in FIG. 2 before entering the power transmission step 850.
  • 9A is a flowchart illustrating a foreign material sensing method in a wireless power transmission apparatus according to another embodiment of the present invention.
  • the wireless power transmitter may measure and store a quality factor value of the resonant circuit in a predetermined recording area (S901).
  • the apparatus for transmitting power wirelessly may determine whether a foreign substance has been detected before (S902).
  • the wireless power transmitter may enter the ping step and wirelessly transmit a digital ping signal for identifying the wireless power receiver (S903).
  • the apparatus for transmitting power wirelessly enters the identification and configuration stage, and when the identification and configuration of the wireless power receiver is completed, may transition to the negotiation phase (S904).
  • the apparatus for transmitting power may determine a threshold (or threshold range) for determining whether there is a foreign substance based on a reference quality factor value included in the FOD status packet received in the negotiation step (S905).
  • a threshold or threshold range
  • the wireless power transmitter may wirelessly transmit a power signal having a predetermined intensity in the negotiation step.
  • the apparatus for transmitting power wirelessly may compare the stored quality factor value with the determined threshold value (or threshold range) to determine whether there is a foreign substance on the charging region (S906).
  • the wireless power transmitter may stop transmitting the power signal and may control to output a predetermined warning alarm indicating that the foreign matter has been detected (S907 to S908). Thereafter, the wireless power transmitter can return to step 901 described above.
  • the wireless power transmitter may enter the power transmission step and start charging the corresponding wireless power receiver (S909).
  • the wireless power transmitter may determine whether the detected foreign matter has been removed from the charging region (S910).
  • the method of determining whether the detected foreign matter is removed from the filling region is replaced with the description of FIGS. 6A to 8B.
  • the wireless power transmitter may enter the power transmission step and resume charging to the corresponding wireless power receiver.
  • the wireless power transmitter may perform step 901.
  • 9B is a flowchart illustrating a foreign material detection method in a wireless power transmission apparatus according to another embodiment of the present invention.
  • the wireless power transmitter may measure and store the quality factor value and / or inductance value of the resonant circuit in a predetermined recording area (S901).
  • the wireless power transmitter may check whether the foreign matter is detected (S902).
  • the wireless power transmitter may enter the ping step and wirelessly transmit a digital ping signal for identifying the wireless power receiver (S903).
  • the apparatus for transmitting power wirelessly enters the identification and configuration stage, and when the identification and configuration of the wireless power receiver is completed, may transition to the negotiation phase (S904).
  • the apparatus for transmitting power may determine a threshold (or threshold range) for determining whether a foreign object exists based on the FOD status packet received in the negotiation step (S905).
  • the threshold value may include an inductance threshold and a quality factor threshold. If the determined value is a threshold range, the threshold range may include an inductance threshold range and a quality factor threshold range.
  • the wireless power transmitter may wirelessly transmit a power signal having a predetermined intensity in the negotiation step.
  • the apparatus for transmitting power wirelessly may compare the stored measurement values with the determined threshold value (or threshold range) to determine whether there is a foreign substance on the charging region (S906).
  • the wireless power transmitter may stop transmitting the power signal and may control to output a predetermined warning alarm indicating that the foreign matter has been detected (optional) (S907 to S908). Thereafter, the wireless power transmitter can return to step 901 described above.
  • the wireless power transmitter may enter the power transmission step and start charging the corresponding wireless power receiver (S909).
  • the wireless power transmitter may determine whether the detected foreign matter has been removed from the charging region (S910).
  • whether the detected foreign matter is removed from the charging region may be determined by comparing the quality factor value and inductance value of the resonance circuit measured in step 901 with the threshold value (or threshold range) determined in step 905. It is not limited.
  • the wireless power transmitter may enter the power transmission step and resume charging to the corresponding wireless power receiver.
  • the wireless power transmitter may perform step 901.
  • the wireless power transmission apparatus measures (or calculates) the quality factor value and the inductance value of the resonant circuit before entering the ping step, when an object is detected in the selection step, and in the negotiation step.
  • FIG. 10 is an experimental result graph showing a degree of deterioration of a quality recognition value from a reference quality factor value for each receiver type when a foreign material is disposed in a charging region according to an embodiment of the present invention.
  • the experimental result shown in FIG. 10 is an experimental result when 10 cent coins were arrange
  • the absolute amount diff1 falling in the quality factor value relative to the reference quality factor value is shown to increase as the reference quality factor value increases.
  • the relationship between the quality factor (NO_FO) value measured when the foreign matter is not disposed, that is, the reference quality factor (RFQ) value, and diff1 may be approximated by the equation 1011.
  • reference numeral 1011 is approximated to a quadratic equation, it should be noted that this is only one embodiment and may be approximated to a linear equation, another higher-order equation, an exponential equation, and the like.
  • a ratio (% diff1) in which a quality factor value drops from a reference quality factor value after placing a 10 cent coin in the charging area is increased as the reference quality factor value increases.
  • the relationship between the quality factor (NO_FO) value measured when the foreign matter is not disposed, that is, the reference quality factor (RFQ) value and% diff1 may be approximated by the equation of FIG. 1021.
  • the reference numeral 1021 is approximated to a quadratic equation, it should be noted that this is only one embodiment and may be approximated to a linear equation, another higher-order equation, an exponential equation, and the like.
  • FIG. 11 is an experimental result graph showing a drop in quality recognition value compared to a reference quality factor value for each receiver type when a foreign material is disposed in a charging region according to another embodiment of the present invention.
  • the experimental result shown in FIG. 11 is an experimental result when a 25 cent coin was arrange
  • the absolute amount diff2 falling in the quality factor value relative to the reference quality factor value is shown to increase as the reference quality factor value increases.
  • the relationship between the quality factor (NO_FO) value, that is, the reference quality factor (RFQ) value, and diff2 measured when the foreign matter is not disposed may be approximated by the equation of FIG. 1111.
  • reference numeral 1111 is approximated to a quadratic equation, it should be noted that this is only one embodiment and may be approximated to a linear equation, another higher-order equation, an exponential equation, and the like.
  • a ratio (% diff2) in which the quality factor value falls with the reference quality factor value increases as the reference quality factor value increases.
  • the relationship between the quality factor (NO_FO) value measured when the foreign matter is not disposed, that is, the reference quality factor (RFQ) value and% diff2 may be approximated by the equation of FIG. 1121.
  • reference numeral 1121 is approximated to a quadratic equation, it should be noted that this is only one embodiment and may be approximated to a linear equation, another higher-order equation, an exponential equation, and the like.
  • the wireless power transmitter measures (or calculates) the quality factor value of the resonant circuit before entering the ping step, and detects an object in the selection step, and receives the FOD received in the negotiation step.
  • the threshold value determined based on the status packet and the measured quality factor value it is possible to significantly reduce the probability of the foreign material detection failure by determining the presence of the foreign material.
  • Reference numeral 1210 denotes an inductance value Ls of a resonant circuit measured in a state in which no one is placed in the charging region 1211, a state in which only foreign substances are disposed 1212, and a state in which only a receiver is disposed 1213, and a resistance value ( Rs) and quality factor values (Q).
  • Reference numeral 1220 illustrates an inductance value Ls, a resistance value Rs, and a quality factor value Q of a resonant circuit measured for each receiver type in a state where a foreign material and a receiver are simultaneously disposed in a charging region.
  • an inductance value of the resonant circuit measured in an empty pad (nothing pad) of the wireless power transmitter is 25.20 ⁇ H, and the quality factor value is 133.8.
  • the inductance value decreases.
  • a receiver capable of receiving wireless power in a state where nothing is disposed in the charging region such as a smartphone equipped with a wireless charging module, is disposed, the inductance value is increased.
  • receiver 2 and receiver 4 show lower quality factor values than FO # 4.
  • the inductance value and the quality factor value when the standard foreign matter FO # 4 and 10 cent coins are additionally disposed with the receiver in the charging region, the inductance value and the quality factor value, as shown in reference numerals 1221 and 1222, respectively. This all lowers. However, the rate at which the inductance value and the quality factor value are lowered depends on the type of receiver. For example, referring to reference numerals 1213, 1221, and 1222, in the case of the receiver 1, when the foreign matter is additionally disposed, the change in the quality factor value is larger than the change in the inductance value. Therefore, in the case of the receiver 1, it may be advantageous to detect a change in the quality factor value rather than the inductance value in order to determine the presence of foreign matter.
  • the change in the inductance value is larger than the change in the quality factor value. Therefore, in the case of the receiver 4, it may be advantageous to detect a change in the inductance value rather than the quality factor value in order to determine the presence of foreign matter.
  • Identifying what type of receiver is located in the charging area is possible at the identification and configuration stage. Therefore, after detecting an object in the selection step and before entering the ping step, the wireless power transmitter cannot identify the type of the receiver.
  • the wireless power transmission apparatus may measure and store both the inductance value and the quality factor value of the resonant circuit before entering the ping step.
  • the apparatus for transmitting power may determine an inductance threshold and a quality factor threshold for the foreign material detection based on the FOD status packet received in the negotiation step.
  • the apparatus for transmitting power wirelessly may compare the determined threshold value with a pre-stored inductance value and a quality factor value to determine the presence of foreign substances.
  • the wireless power transmitter determines that the foreign matter exists by comparing the inductance threshold value of the stored inductance value or the stored quality factor value is determined to exist by comparing the stored quality factor value with the determined quality factor threshold value, It may be determined that the foreign matter is disposed in the charging region.
  • the wireless power transmitter is described as determining the threshold value for the foreign material detection based on the FOD status packet, but this is only one embodiment, and the threshold range may be determined. In this case, the wireless power transmitter may determine that the foreign matter exists when the stored inductance value and / or the quality factor value are out of the determined threshold range.
  • the foreign material detection method in the wireless power transmitter may further include receiving a received power strength packet for power correction from the wireless power receiver.
  • the received power strength packet may include received power of the wireless power receiver corresponding to the light load or received power of the wireless power receiver corresponding to the load connection state.
  • FIG. 13A is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 1340 may have a length of 1 byte, an operating frequency for maximum quality factor value 1340 field, and 2 bits. It can be configured to include a mode (Mode, 1342) field of length.
  • the wireless power transmitter if there is an operating frequency of a higher band in which a higher quality factor value is measured than a quality factor value measured at an operating frequency having a maximum quality factor value, a foreign material may be present in the charging region. It can be judged that.
  • the operating frequency of the upper band means a certain frequency larger than the operating frequency having the maximum quality factor value in the operating frequency band.
  • the peak factor of the peak frequency of the quality factor higher than the operating frequency having the maximum quality factor value (operation frequency of which the maximum quality factor value is measured among the quality factor values measured before the ping step ) It may be determined that foreign matter exists in the charging region.
  • the operating frequency 1341 for the maximum quality factor value may be an operating frequency for the maximum quality factor value corresponding to the type of the wireless power transmitter identified in the identification and configuration step 530 of FIG. 5.
  • operating frequency information for the maximum quality factor value for each type of wireless power transmitter accessible to the wireless power receiver may be maintained in a predetermined recording area.
  • the operating frequency for the maximum quality factor value may vary depending on the power class, design type, manufacturer, applied standards, etc. of the wireless power transmitter.
  • the wireless power transmitter needs to measure the quality factor value in order to detect the presence of foreign substances. Can be minimized. That is, the wireless power transmitter does not need to measure the quality factor value for the frequency band lower than the operating frequency for the maximum quality factor value.
  • the operating frequency 1341 for the maximum quality factor value is a radio equipped with a transmission coil of a specific coil type defined in the WPC standard, for example, but not limited to, an MP-A1 type. It may be an operating frequency for the maximum quality factor value corresponding to the power transmitter. Based on the MP-A1 type, another type of wireless power transmitter may be used to determine the presence of foreign substances by scaling the maximum quality factor value received in consideration of design differences and product characteristics.
  • the wireless power transmitter may measure and store the quality factor value a1 for a specific upper limit frequency of the operating frequency band in the ping step 520 (or before the ping step) of FIG. 5.
  • the maximum quality factor and the frequency at which the maximum quality factor is measured may be stored among the quality factors measured in the preset frequency range (within the operating frequency range).
  • the wireless power transmitter measures the quality factor value a2 at the operating frequency 1341 for the maximum quality factor value received via the FOD status packet 1340 in negotiation step 540, and if a1 is greater than a2, charging It may be determined that foreign matter exists in the area.
  • the wireless power transmitter measures the operating frequency for the maximum quality factor value received through the FOD status packet 1340 in the negotiation step 540 and the maximum quality factor measured in the ping step 520 (or before the ping step).
  • the presence of foreign substances can be determined by comparing the frequencies.
  • the frequency measured by the maximum quality factor measured in the ping step 520 is greater than the received operating frequency of the quality factor, it may be determined that there is a foreign substance. This principle is described in detail below.
  • the wireless power transmitter may measure only the quality factor value for the upper limit frequency of the operating frequency band in the ping step 520 (or before the ping step). However, this is just one embodiment. Both quality factor values for the lower and upper frequencies may be measured. Another embodiment may measure the quality factor value of each frequency by sweeping from the lower limit frequency to the upper limit frequency.
  • Another embodiment may measure the quality factor value of each frequency by sweeping in a specific frequency domain.
  • the wireless power transmitter is defined to measure the quality factor value for the lower limit frequency of the operating frequency band in the ping step 520.
  • the wireless power transmitter may measure only the quality factor value for the upper limit frequency of the operating frequency band in the ping step 520, but this is only one embodiment, and the other embodiment may be applied to the lower limit frequency and the upper limit frequency. All of the quality factor values may be measured.
  • a frequency offset value from the lower limit frequency, that is, the lowest frequency, within the operating frequency may be recorded.
  • the offset unit may mean actual 10KHz, but is not limited thereto and may be smaller or larger.
  • the operating frequency band of the wireless power transmitter is between the lower limit frequency 100KHz and the upper limit frequency 300KHz
  • the offset unit is 10KHz
  • the value recorded in the operating frequency 1341 field for the maximum quality factor value is binary 000011
  • the frequency for the maximum quality factor value may be 130KHz (100KHz + 3 * 10KHz).
  • the wireless power transmitter may measure a quality factor value by sweeping a specific frequency band among all operating frequency bands or all operating frequency bands before the pinging step.
  • an operating frequency value in which the quality factor value is lowered by a predetermined value (or ratio) than the reference quality factor value is a field ( 1341).
  • the wireless power transmitter has a quality factor value B1 measured at a reference operating frequency (e.g., an operating frequency for measuring the quality factor value is 100 kHz) in the ping step 520 (or before the ping step) and the received By comparing the quality factor value (B2) measured at the operating frequency greater than the operating frequency it can be determined whether the presence of foreign substances.
  • a reference operating frequency e.g., an operating frequency for measuring the quality factor value is 100 kHz
  • B2 is larger than B1
  • 13B is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 1350 may have a length of 2 bytes, and an operating frequency for maximum quality factor value 1351 field, 2 bits, may be 6 bits long. It may be configured to include a mode (length 1352) field of length and a reference quality factor value (1353) of 1 byte length.
  • the wireless power transmitter may determine whether the FOD status packet received through the mode 1352 value includes the operating frequency 1351 for the maximum quality factor value, but is not limited thereto.
  • the FOD status packet may always include an operating frequency 1351 for the maximum quality factor value.
  • the wireless power transmitter may compare the reference quality factor value with the quality factor value measured in the ping step 220 (or before the ping step) to determine whether the foreign material exists or not. 1) Alternatively, the presence of the foreign matter may be determined by comparing the operating frequency for the maximum quality factor value with the maximum operating frequency corresponding to the maximum quality factor value measured in the ping step 220 (or before the ping step) ( Method 2, embodiments of FIG. 13A).
  • the presence of a foreign matter may be determined in a complex manner.
  • the wireless power transmitter may determine whether there is a foreign substance in the first method.
  • two thresholds (threshold 1: Q_Threshold 1 and threshold 2: Q_Threshold 2) may be determined based on the received reference quality factor values.
  • Threshold 1 has a value higher than threshold 2.
  • the wireless power transmitter may determine that a foreign substance exists.
  • the wireless power transmitter may determine whether there is a foreign substance through method 2.
  • 13C is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 1360 may have a length of 2 bytes, a 6-bit long wireless power transmitter type (Tx Type) 1361, a 2-bit mode (Mode, 1362) field, and the like. It may be configured to include an Operating Frequency for Maximum Quality Factor Value (1363) field of 1 byte length.
  • the wireless power transmitter may determine whether the FOD status packet received through the mode 1362 value includes the wireless power transmitter type 1361 information and the operating frequency 1363 information for the maximum quality factor value, but is not limited thereto.
  • the FOD status packet may always include the wireless power transmitter type 1361 information and the operating frequency 1363 information for the maximum quality factor value regardless of the mode 1362 value.
  • the wireless power transmitter type 1361 may be a value (a predetermined classification number) indicating a predetermined transmitter design number (Tx Design Number) for uniquely identifying a wireless power transmitter registered at the time of WPC (Qi) authentication. .
  • the wireless power transmitter type 1361 may be a predetermined classification number for classifying a wireless power transmitter having common design features and performance characteristics.
  • the wireless power transmitter if there is an operating frequency of a higher band in which a higher quality factor value is measured than a quality factor value measured at an operating frequency having a maximum quality factor value, a foreign material may be present in the charging region. It can be judged that.
  • the operating frequency of the upper band means a certain frequency larger than the operating frequency having the maximum quality factor value in the operating frequency band.
  • a wireless power transmitter measures a peak operating frequency of a higher quality band than an operating frequency having a maximum quality factor value (among the quality factor values measured before the ping step, the maximum quality factor value is measured). If there is an operating frequency), it can be determined that foreign matter exists in the charging region.
  • a specific foreign material may be Foreign Object # 4-, which is an aluminum disk having a diameter of 22 mm and a thickness of 1 mm, may be used in combination with FO4 for convenience of description, but is not limited thereto. Either one may be used.
  • the wireless power transmitter measures the current quality factor value before performing the ping phase, i.e., in the selection phase.
  • the wireless power transmitter has a reference quality factor value received from the wireless power receiver at the negotiation stage, and production and measurement tolerance and reference quality factor accuracy to account for the design differences of the transmitters. Considering the (Accuracy of Reference Quality Factor) determines the quality factor threshold for determining the presence of foreign substances.
  • the reference quality factor value is determined in five of the charging areas of the Test Power Transmitter (TPT) —for example, the MP1 (MP-A1) type transmitter (medium, 4 positions shifted 5 mm left and right). It means the smallest value among the measured quality factor values. According to a design difference between the test power transmitter MP1 and a commercial wireless power transmitter, such as an inductance value of a transmission coil, the quality factor value measured in the actual charging region may be different for each transmitter. The error that compensates for this is called production and measurement error.
  • TPT Test Power Transmitter
  • the reference quality factor drop value 1321 may be determined as a value obtained by subtracting a quality factor value measured in the presence of a specific foreign material from a reference quality factor value corresponding to the corresponding wireless power receiver.
  • the reference quality factor drop value 1321 may be a ratio of a drop in the quality factor value measured when the foreign matter exists compared to the reference quality factor value measured when the foreign matter does not exist.
  • the reference quality factor drop value 1321 may be an integer value calculated as a percentage (%) or a percentage divided by a specific unit value (STEP_VALUE), but is not limited thereto.
  • the reference quality factor drop value 1321 may be calculated by Equation 1 below.
  • * 100 is expressed as% and the actual value may be a value that does not reflect * 100.
  • the wireless power receiver may have different reference quality factor drop values depending on the manufacturer or product type.
  • the wireless power transmitter obtains the reference quality factor drop value from the sensed wireless power receiver, and adaptively determines the quality factor threshold for determining the presence of foreign matter in consideration of the reference quality factor drop value. Can be determined.
  • the present invention can minimize the problem that the foreign matter is not normally detected even though the actual foreign matter is located in the charging region, the heat generation or power transmission efficiency is significantly reduced.
  • FIG. 13D illustrates a message structure of a FOD status packet according to an embodiment of the present invention.
  • the FOD status packet message 1300 may have a length of 2 bytes, and a 6-bit reserved (Reserved) 1301, a 2-bit mode (1302) field, and a 1-byte length It may be configured to include a reference quality factor value (1303).
  • All bits constituting the reservation 1301 field may be set to zero.
  • the mode 1302 field is binary '00', it means that the reference quality factor (RQF_NO_FO, first reference quality factor) value in the absence of the FO is recorded in the reference quality factor value 1303 field. If the mode 1302 field is a binary number '01', it may mean that a reference quality factor (RQF_FO, second reference quality factor) value in the FO state is recorded in the reference quality factor value 1303 field.
  • 13E is a diagram for explaining a message structure of an FO status packet according to another embodiment of the present invention.
  • the FO status packet message 1310 may have a length of 3 bytes, a 6-bit reserved (Reserved) 1311, a 2-bit length (Mode, 1312) field, a reference quality factor value. (Reference Quality Factor Value, 1313) and Reference Quality Factor Value With Foreign Object (1314).
  • All bits constituting the reservation 1301 field may be set to zero.
  • the operation mode of the power receiver to which the corresponding reference quality factor value 1313 is applied may be identified through the mode 1312 field.
  • the mode 1312 value is binary '00', it means that the reference quality factor value measured when the power of the wireless power receiver is turned off.
  • the wireless power receiver may have different reference quality factor values measured when there is no foreign substance by manufacturer and / or product type and measured reference quality factor values when foreign substances exist.
  • the wireless power transmitter adaptively determines a quality factor threshold for determining whether a foreign substance exists in consideration of a reference quality factor value measured when no foreign matter is present and a reference quality factor value measured when there is a foreign matter. Can be determined. This is because the amount of change in the quality factor value may vary depending on the presence of foreign substances in each receiver. Through this, the present invention can minimize the problem that the foreign matter is not normally detected even though the actual foreign matter is located in the charging region, the heat generation or power transmission efficiency is significantly reduced.
  • 13F is a diagram for explaining a message structure of an FO status packet according to another embodiment of the present invention.
  • the FO status packet message 1120 may have a length of 2 bytes, a 6-bit drop value of reference quality factor field, and a 2-bit length mode ( Mode, 1322) field, and a Reference Quality Factor Value field 1323.
  • the reference quality factor drop value 1321 is determined based on the reference quality factor value 1223 measured when no foreign matter is present and the quality factor value with foreign object measured when the foreign matter is present. Can be a value.
  • the mode 1322 field may be used to indicate that the reference quality factor drop value 1321 is recorded in the reservation 1301 field of FIG. 13D described above.
  • the value of the mode 1322 field when the value of the mode 1322 field is binary '01', it may mean that the reference quality factor drop value 1321 is recorded in the reserved field. Only another value of the mode 1322 field, e.g., binary '10' or binary '11', may be used to indicate that the reference quality factor drop value 1321 is recorded in the reserved field.
  • the reference quality factor value 1323 may automatically imply that the power of the power receiver is measured in the OFF state.
  • the format of the foreign matter status packet is classified and described as a mode according to a specific embodiment, but the foreign matter status packet may be the embodiment of FIGS. 13D to 13G regardless of the mode.
  • FIG. 13G illustrates a message structure of an FO status packet according to another embodiment of the present invention.
  • the FO status packet message 1330 may have a length of 2 bytes, a 6-bit length of Accuracy of Reference Quality Factor field, and a 2-bit length mode. 1332) field, and a Reference Quality Factor Value (3331) field.
  • the reference quality factor accuracy 1331 may be an allowance of an error with respect to the reference quality factor value 1333 measured when no foreign matter exists.
  • the reference quality factor value to which the tolerance of the error is applied may be set at a rate that increases or decreases from the reference quality factor value 1333 received from the wireless power receiver, but is not limited thereto.
  • the reference quality factor accuracy 1331 may have different values depending on the manufacturer (or) and product type of the corresponding wireless power receiver.
  • the wireless power receiver of Company A and the wireless power receiver of Company B may have different accuracy of reference quality factor values measured in conjunction with the same wireless power transmitter. Therefore, the wireless power transmitter needs to acquire information about the reference quality factor accuracy for each wireless power receiver, and may determine a quality factor threshold for determining whether there is a foreign substance in consideration of the reference quality factor accuracy.
  • the wireless power transmitter will hereinafter simply refer to the quality factor threshold value for determining whether there is a foreign substance for convenience of description as FO_QF_THRESHOLD.
  • the test result of the same wireless power transmitter the reference quality factor value measured for the wireless power receiver of Company A is 100
  • the reference quality factor value measured for the wireless power receiver of Company B may be 70.
  • the reference quality factor accuracy corresponding to company B's wireless power receiver-for example, within +/- 7%- is the reference quality factor accuracy corresponding to company A's wireless power receiver-for example, +/- 10%.
  • the quality factor accuracy may vary depending on the configuration of the finished product on which the receiver is installed. For example, depending on the PCB, camera module, antenna and other components mounted on the finished product, the quality factor can be measured lower than other finished products even in the absence of foreign substances. Accordingly, in the case of the finished product located in the filling region together with the foreign matter, the difference in the quality factor value may be smaller than that of the other finished products, and thus higher measurement accuracy is required.
  • the mode 1332 field may be used to indicate that the reference quality factor accuracy 1331 is recorded in the reservation 1301 field of FIG. 13D described above.
  • the value of the mode 1332 field when the value of the mode 1332 field is binary '01', it may mean that the reference quality factor accuracy 1331 is recorded in the reserved field.
  • Other values of the mode 1332 field e.g., binary '10' or binary '11', may be used to indicate that the reference quality factor accuracy 1331 is recorded in the reserved field.
  • the reference quality factor value 1333 may automatically imply that the power of the power receiver is measured in the OFF state.
  • FIG. 14 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • the wireless power receiver 1410 may transmit a FOD status packet including a second reference quality factor value (RQF_FO) to the wireless power transmitter 1420 ( S1401).
  • the mode value of the FOD status packet may be set to binary “01”.
  • the second reference quality factor value may be determined as the value having the smallest value among the quality factor values measured at a plurality of points on the charging region of the designated specific wireless power transmitter and maintained at the wireless power receiver.
  • the second reference quality factor value RQF_FO is measured at a central position where the primary coil and the secondary coil are well aligned in the presence of the FO near the wireless power receiver placed in the charging area.
  • the first quality factor value and the FO in the vicinity of the wireless power receiver may be +/- 5 mm in a certain distance offset from the center without rotation of the wireless power receiver, for example, in the x and y axes, respectively. May be determined to be the smallest of the measured second quality factor values.
  • the second quality factor values may include quality factor values measured at at least four different locations.
  • the wireless power transmitter 1420 may determine a threshold value for FO detection based on the received second reference quality factor value and a design factor stored in advance corresponding to the wireless power transmitter 1420 (S1403).
  • a correction quality factor threshold Q_threshold_correct the second reference quality factor value corrected based on the configuration factor.
  • the second reference quality factor value is determined based on the quality factor value measured on the designated specific wireless power transmitter hereinafter referred to as the test wireless power transmitter BUSINESS CARD, and thus, is described below as a commercially manufactured wireless power transmitter by a specific manufacturer.
  • the business card a commercial wireless power transmitter
  • the quality factor values measured under the same conditions may be different in a commercial wireless power transmitter and a test wireless power transmitter. Therefore, the second reference quality factor value used as the threshold for FO detection in the embodiment of FIG. 20 described above needs to be corrected in consideration of the configuration and characteristics of the commercial wireless power transmitter, that is, the configuration factor.
  • a configuration factor may include a power class corresponding to a corresponding commercial wireless power transmitter, characteristics and arrangement of a transmitting coil, a power control algorithm mounted on the transmitter, power transfer loss, and a corresponding wireless power transmitter. It may be a correction constant value determined based on at least one parameter of the shape and structure of, but is not limited thereto, and may be a value capable of correcting a quality factor measurement error compared to a test wireless power transmitter.
  • the wireless power transmitter 1420 may measure the current quality factor value Q_current and compare whether the current quality factor value Q_current is greater than or equal to the correction quality factor threshold Q_threshod_correct (S1403 to S1404).
  • the current quality factor value may be performed before the digital pinging step, immediately before the negotiation (renegotiation) step, or periodically.
  • the wireless power transmitter 1420 determines that the FO is not detected and sends an ACK response to the wireless power receiver 1410. It may transmit (S1405). At this time, the state of the wireless power transmitter 1420 may transition from the negotiation step to the power transmission step.
  • the wireless power transmitter 1420 determines that the FO has been detected and transmits to the wireless power receiver 1410.
  • the NAK response may be transmitted (S1406). At this time, the state of the wireless power transmitter 1420 may transition from the negotiation step to the selection step.
  • 15 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • the wireless power receiver 1510 may transmit first to second FOD status packets including a reference quality factor value (Q_reference) to the wireless power transmitter 1520.
  • Q_reference a reference quality factor value
  • the first FOD status packet may include a first reference quality factor value RQF_NO_FO when the mode is binary '00'.
  • the second FOD state packet may include a second reference quality factor value (RQF_FO) when Mode is 1, that is, a reference quality factor value determined based on the quality factor value measured while the FO is in the charging region. have.
  • the first reference quality factor value RQF_NO_FO is greater than the second reference quality factor value RQF_FO.
  • the first to second reference quality factor values may each be determined based on the quality factor values measured in the absence of the FO near the receiver and the presence of the FO near the receiver.
  • the first to second reference quality factor values may be determined as values having the smallest value among the quality factor values measured at a plurality of points on the charging region of the specific test wireless power transmitter.
  • the wireless power transmitter 1520 may determine a quality factor threshold rate (Q_threshold_rate) for FO detection based on the received first to second reference quality factor values (S1503).
  • Q_threshold_rate a quality factor threshold rate for FO detection based on the received first to second reference quality factor values (S1503).
  • the wireless power transmitter 1520 may measure a current quality factor value Q_current and calculate a quality factor reduction ratio Q_decrease_rate based on the measured current quality factor value and the first reference quality factor value RQF_NO_FO (S1404). ).
  • the current quality factor value may be performed before the digital pinging step, immediately before the negotiation (renegotiation) step, or periodically.
  • the wireless power transmitter 1520 may compare whether the quality factor reduction ratio Q_decrease_rate is smaller than the quality factor threshold ratio Q_threshold_rate (S1505).
  • the wireless power transmitter 1520 determines that the FO is not detected, and transmits an ACK response to the wireless power receiver 1510 (S1506). At this time, the state of the wireless power transmitter 1520 may transition from the negotiation step to the power transmission step.
  • the wireless power transmitter 1520 determines that the FO has been detected, and transmits to the wireless power receiver 1510.
  • the NAK response may be transmitted (S1507). In this case, the state of the wireless power transmitter 1520 may transition from the negotiation stage to the selection stage.
  • the FO detection is performed by comparing the quality factor reduction ratio Q_decrease_rate and the quality factor threshold ratio Q_threshold_rate, but this is only one embodiment.
  • the wireless power transmitter calculates the correction quality factor threshold ratio (Q_threshold_rate_correct) based on a configuration factor corresponding to the wireless power transmitter, and compares the quality factor reduction ratio (Q_decrease_rate) and the correction quality factor threshold ratio (Q_threshold_rate_correct). It may be determined whether the FO exists in the charging region.
  • the quality factor threshold may be determined as follows.
  • the received quality factor measurement error range (ex ⁇ 10% (0.1 * reference quality factor value), or Accuracy of Quality Factor Value (FIG. 19g)) and transmitter characteristics (transmitter type ( Design, manufacturer, product or measurement error, etc.).
  • FIG. 16 shows a quality factor table according to an embodiment of the present invention.
  • the quality factor table 1600 shown in FIG. 16 may be maintained in the memory of the wireless power transmitter.
  • the wireless power transmitter may update the quality factor table 1600 based on the received FO status packet.
  • the quality factor table 1600 may include a receiver identifier 1601 field, a most recently measured quality factor value (1602) field, a first reference quality factor value (RQF_NO_FO, 1603) field, a second And at least one of a reference quality factor value (RQF_FO) field and a correction quality factor threshold value (Q_threshold_correct, 1605) field.
  • the receiver identifier 1601 may be configured by combining any one or at least one of a manufacturer code, a basic device identifier, and an extended device identifier obtained in the identification and configuration steps. Can be.
  • the receiver identifier may be configured by concatenating a manufacturer code and a basic device identifier.
  • the receiver identifier may be configured by concatenating a manufacturer code, a basic device identifier, and an extended device identifier.
  • the most recently measured quality factor value 1602 field may record the most recently measured quality factor value corresponding to the corresponding receiver identifier 1601. At this time, when charging of the wireless power receiver corresponding to the corresponding receiver identifier 1601 is normally completed or when a normal state transition to the power transmission state is made at the negotiation stage, the wireless power transmitter may determine the quality factor value measured at the negotiation stage. It can be recorded in the quality factor table 1600.
  • the wireless power transmitter when the wireless power transmitter receives the FOD status packet in the negotiation step, the wireless power transmitter sets the second reference quality factor value RQF_FO or (and) the first reference quality factor value RQF_NO_FO included in the FOD status packet to the quality factor table 1600. You can also write
  • the wireless power transmitter may record the correction quality factor threshold Q_threshold_correct calculated for the FO detection in the quality factor table 1600 during the initial negotiation with the wireless power receiver.
  • the wireless power transmitter When the wireless power transmitter detects a wireless power receiver corresponding to the receiver identifier recorded in the quality factor table 1600, the wireless power transmitter may detect the FO by referring to the quality factor table 1600.
  • the quality factor table 1600 further includes at least one of the reference quality factor drop value 1321 described in FIG. 13F and the reference quality factor accuracy 1331 described in FIG. 13D. Can be configured.
  • FIG. 17 is a block diagram illustrating a configuration of an FO detection apparatus according to an embodiment of the present invention.
  • the FO detection apparatus 1700 may be mounted or mounted on a wireless power transmitter.
  • the FO detection apparatus 1700 includes a communication unit 1710, a determination unit 1720, a measurement unit 1730, a detection unit 1740, a control unit 1750, and a power transmission unit 1760. Can be.
  • the communication unit 1710 may receive a FOD status packet including a reference quality factor value from the wireless power receiver connected in the negotiation step.
  • the reference quality factor values are reference quality factor values (RQF_NO_FO, first reference quality factor value) when the FO is not present in the filling region and reference quality factor values (RQF_FO, second criterion) when the FO is present in the filling region. Quality factor value), and may be received through one FOD status packet or a plurality of FOD status packets in the negotiation step.
  • the determiner 1720 may determine a threshold to be used for FO detection based on the received reference quality factor value.
  • the threshold used for FO detection may be determined as the second reference quality factor value RQF_FO, but this is only one embodiment, and the threshold used for FO detection according to another embodiment of the present invention
  • the second reference quality factor value may be determined based on a configuration factor corresponding to the wireless power transmitter.
  • the threshold value used for FO detection according to another embodiment of the present invention may be determined by a quality factor threshold rate (Q_threshold_rate) calculated based on the first to second reference quality factor values.
  • Q_threshold_rate a quality factor threshold rate
  • the quality factor threshold ratio Q_threshold_rate may be determined as a value obtained by dividing the second reference quality factor value RQF_FO by the first reference quality factor value RQF_NO_FO.
  • the threshold value used for FO detection may include a first correction reference quality factor calculated by applying the first to second reference quality factor values corresponding to the corresponding wireless power transmitter. It may be determined based on the correction quality factor threshold ratio Q_threshold_rate_correct calculated based on the second correction reference quality factor.
  • the measurer 1730 may measure or calculate a value related to a current quality factor compared with the threshold value when detecting the FO.
  • the measurer 1730 may measure the current quality factor value Q_current in the negotiation step.
  • the measurer 1730 may calculate a quality factor reduction ratio Q_decrease_rate based on the measured current quality factor value Q_current and the first reference quality factor value RQF_NO_FO.
  • the quality factor reduction ratio Q_decrease_rate may be calculated as [RQF_NO_FO-Q_current] / [RQF_NO_FO].
  • the measurement unit 1730 may calculate the current quality factor ratio Q_current_rate based on the measured current quality factor value Q_current and the first reference quality factor value RQF_NO_FO.
  • the current quality factor ratio Q_current_rate may be calculated as [Q_current] / [RQF_NO_FO].
  • the detector 1740 may detect whether the FO exists in the charging area by comparing the threshold determined by the determiner 1720 with the value measured or calculated by the measurer 1730.
  • the detector 1740 may determine that the FO exists in the charging region when the current quality factor value Q_current is smaller than the second reference quality factor value RQF_FO. have.
  • the detector 1740 may determine that the FO exists in the charging region when the current quality factor value Q_current is smaller than the correction quality factor threshold Q_threshold_correct. have.
  • the detector 1740 may compare the quality factor reduction ratio Q_decrease_rate and the quality factor threshold ratio Q_threshold_rate to determine whether the FO exists in the charging region. Can be.
  • the detector 1740 determines whether the FO exists in the charging area by comparing the quality factor reduction ratio Q_decrease_rate with a correction quality factor threshold ratio calculated based on a configuration factor corresponding to the wireless power transmitter. can do.
  • the detector 1740 may determine the quality factor threshold as follows.
  • the received quality factor measurement error range (ex ⁇ 10% (0.1 * reference Q-Factor Value), or Accuracy of Quality Factor Value (FIG. 11D)) and transmitter characteristics (transmitter type) to the received reference quality factor value. (Design), manufacturer, product or measurement error, etc.).
  • the controller 1750 may control the overall operation and input / output of the FO detection apparatus 1700. For example, when the FO is not detected by the detector 1740, the controller 1750 transitions the state of the wireless power transmitter from the negotiation stage to the power transfer stage, and the power transmitter 1760 is required to charge the load. Can be controlled to send. As another example, when the FO is detected by the detector 1740, the controller 1750 transitions the state of the wireless power transmitter from the negotiation stage to the selection stage and controls the power transmission of the power transmitter 1760 to be cut off. can do.
  • the FO detection apparatus 1700 may further include a memory (not shown) for maintaining the quality factor table 1600 illustrated in FIG. 16.
  • the FO detection apparatus 1700 is not detected by the detection unit 1740, the wireless power receiver and itself (wireless power transmitter) before the transition to the power transmission step. It may further include a correction unit (not shown) for calculating the power loss therebetween.
  • FIG. 18 is a flowchart illustrating a FOD detection method according to an embodiment of the present invention.
  • the wireless power receiver 1810 wirelessly transmits a FOD state packet including a reference quality factor value and a drop value of reference quality factor.
  • the transmitter 1820 may transmit the data to the transmitter 1820 (S1801).
  • the mode value of the FOD status packet may be set to binary “01”, but is not limited thereto.
  • the reference quality factor value may be determined as the value having the smallest value among the quality factor values measured at a plurality of points on the charging region of the specific wireless power transmitter designated for the performance test and maintained in the wireless power receiver.
  • the wireless power transmitter 1820 may determine a quality factor threshold value (Q_threshold) using the received reference quality factor value and the reference quality factor drop value (S1803).
  • Q_threshold a quality factor threshold value
  • the wireless power transmitter 1820 may determine a value obtained by subtracting the reference quality factor drop value from the reference quality factor value as the quality factor threshold value, but is not limited thereto.
  • the quality factor threshold may be determined using a predetermined quality factor threshold generation function in which the reference quality factor value and the reference quality factor drop value are input variables.
  • the wireless power transmitter 1820 may measure the current quality factor value Q_current and compare whether the current quality factor value Q_current is greater than or equal to the quality factor threshold Q_threshod (S1803 to S1804).
  • the current quality factor value may be performed before the digital ping step, may be measured immediately before the negotiation (renegotiation) step, or periodically after the digital ping step.
  • the wireless power transmitter 1820 determines that the FO is not detected and transmits an ACK response to the wireless power receiver 1810. It may be (S1805). At this time, the state of the wireless power transmitter 1820 may transition from the negotiation step to the power transmission step.
  • step 1804 if the current quality factor value Q_current is smaller than the quality factor threshold Q_threshod, the wireless power transmitter 1820 determines that the FO is detected, and the NAK is transmitted to the wireless power receiver 1810. The response may be transmitted (S1806). In this case, the state of the wireless power transmitter 1820 may transition from the negotiation stage to the selection stage.
  • FIG. 19 is a flowchart illustrating a FOD detection method according to another embodiment of the present invention.
  • the wireless power receiver 1910 transmits a FOD state packet including an Accurate of Reference Quality Factor and a Reference Quality Factor Value.
  • the mode value of the FOD status packet may be set to binary “01”, but is not limited thereto.
  • the wireless power transmitter 1920 may determine a quality factor threshold value (Q_threshold) using the received reference quality factor accuracy and the reference quality factor value (S1903).
  • Q_threshold a quality factor threshold value
  • the wireless power transmitter 1920 may further determine the quality factor threshold value by further using a pre-stored production and measurement tolerance.
  • the wireless power transmitter 1920 may determine, as the quality factor threshold, a value obtained by subtracting the reference quality factor accuracy and the production and measurement error from the reference quality factor value, but is not limited thereto.
  • the quality factor threshold may be determined using a predetermined quality factor threshold generation function in which the reference quality factor accuracy and the reference quality factor value are input variables.
  • the wireless power transmitter 1920 may measure the current quality factor value Q_current and compare whether the current quality factor value Q_current is greater than or equal to the quality factor threshold Q_threshod (S1903 to S1904).
  • the current quality factor value according to an embodiment of the present invention may be performed before the digital ping step, may be measured just before the negotiation (renegotiation) step, or periodically after the digital ping step.
  • the wireless power transmitter 1920 determines that the FO is not detected and transmits an ACK response to the wireless power receiver 1910. It may be (S1905). In this case, the state of the wireless power transmitter 1920 may transition from the negotiation stage to the power transmission stage.
  • the wireless power transmitter 1920 determines that the FO has been detected, and the NAK is transmitted to the wireless power receiver 1910.
  • the response may be transmitted (S1906).
  • the state of the wireless power transmitter 1920 may transition from the negotiation stage to the selection stage.
  • the wireless power transmitter may acquire all of the reference quality factor value, the reference quality factor accuracy, and the reference quality factor drop value through the plurality of FOD status packets.
  • the wireless power transmitter may determine the quality factor threshold value using at least one of a reference quality factor value, a reference quality factor accuracy, a reference quality factor drop value, and a production and measurement error.
  • the wireless power transmitter may determine an output value of a predetermined quality factor threshold generation function that uses a reference quality factor value, a reference quality factor accuracy, and a reference quality factor drop value as an input variable as a quality factor threshold value.
  • a wireless power transmitter obtains a quality factor value, a reference quality factor accuracy, and a reference quality factor drop value measured in the absence of foreign matter through a plurality of FOD status packets from a wireless power receiver. You may.
  • the wireless power transmitter may determine the quality factor threshold by subtracting the reference quality factor accuracy and the reference quality factor drop value from the quality factor value measured in the absence of foreign matter.
  • the wireless power transmitter may determine a quality factor threshold value based on an output value of a predetermined quality factor threshold generation function having as input variables a quality factor value, a reference quality factor accuracy, and a reference quality factor drop value measured in the absence of foreign matter. You can also decide by value.
  • FIG. 20 is a flowchart illustrating a FO detection method based on a quality factor value according to an embodiment of the present invention.
  • the wireless power transmitter may measure a first quality factor value for a first frequency within a preset operating frequency band (S2001).
  • the operating frequency band may be preset to a frequency band between 100 KHz and 210 KHz, but this is only one embodiment, and different operation according to the setting and configuration aspects of the corresponding wireless power transmitter or (and) applied standard specifications. Note that the frequency band can be set. Therefore, step S2001 may be omitted and step S2003 may be replaced to measure a quality factor value for a specific frequency.
  • the wireless power transmitter may measure a second quality factor value for a second frequency that is greater than a first frequency in an operating frequency band (S2003).
  • the wireless power transmitter may compare the magnitudes of the first quality factor value and the second quality factor value (S2005).
  • the first frequency may be an operating frequency for peak Q factor value of 12 to 11 g.
  • step S2005 confirms the first frequency by receiving the FOD status packet in the negotiation step, the first quality factor value corresponding to the confirmed first frequency and the second quality factor corresponding to the second frequency greater than the first frequency. You can compare the values.
  • the first frequency may be 100khz.
  • the wireless power transmitter may determine that the wireless power receiver is arranged in a charging area (S2007).
  • a state in which the coupling coefficient between the transmission resonance coil (primary coil) and the reception resonance coil (secondary coil) is high may refer to a well-aligned state.
  • the wireless power transmitter may determine that a foreign power is present or not aligned in the charging area in which the wireless power receiver is disposed (S2009). .
  • step 2005 when the second quality factor value is larger than the first quality factor value, only the foreign matter may be indicated in the filling region.
  • the quality factor value corresponding to the second frequency may be larger than the quality factor value corresponding to the first frequency than the misalignment (unaligned) state in the presence of the foreign matter.
  • Foreign matter with a small effect may have a similar quality factor value as that of an unaligned object, but the quality factor value measured in the presence of a foreign matter with a relatively high impact is relatively different from the quality factor value measured in the presence of an unaligned receiver. It can make a big difference.
  • the wireless power transmitter determines that a foreign object or an unaligned wireless power receiver is disposed, when the current power transmission is in progress, the wireless power transmitter stops power transmission and indicates that the foreign power or unaligned wireless power receiver is disposed.
  • a predetermined alarm signal can be output.
  • the wireless power transmitter may wait for a predetermined time after outputting the alarm signal and enter the selection step to search for the receiver again.
  • the time to wait before entering the selection step may be determined in consideration of the time taken for the wireless power receiver that is not removed or aligned by the user to be disposed in the charging area by the user.
  • the wireless power transmitter measures quality factor values for the first frequency and the second frequency before entering the selection step, and compares the quality factor values to determine whether foreign substances disposed in the charging region are removed. have. If foreign material removal is confirmed, the wireless power transmitter may enter a selection step.
  • the wireless power transmitter may determine whether the wireless power receiver is aligned by measuring and comparing the quality factor values for the first frequency and the second frequency before entering the selection step. As a result of the check, when the wireless power receiver is aligned, the wireless power transmitter may enter a selection step.
  • the wireless power transmitter may perform the above-described steps 2701 to 2709 in the selection step 210 of FIG. 2. However, this is only one embodiment, and may be performed before any negotiation step 240. Step may be performed, for example, any one of a selection step 210, a ping step 220, and an identification and configuration step 230.
  • the wireless power transmitter may perform steps 2701 to 2709 in the power transmission step 260 of FIG. 2.
  • the wireless power transmitter may measure the quality factor value for each frequency during power control using the operating frequency adjustment, and compare the same to determine whether there is a foreign substance in the charging region.
  • the wireless power transmitter may determine (or obtain) a quality factor peak frequency at which a maximum quality factor value is measured within a preset operating frequency band. S2001 and S2003 Sweep frequencies within a preset operating frequency band (or a specific frequency band) and find an operating frequency at which the maximum quality factor value is measured.
  • the wireless power transmitter may receive the FOD status packet including the reference peak frequency from the wireless power receiver and compare the reference peak frequency with the obtained quality factor peak operating frequency to determine whether there is a foreign substance. It can be directly compared with the reference peak frequency, the threshold frequency can be determined in consideration of the error of the transmission coil or design, product, and the obtained quality factor peak operating frequency threshold frequency can be compared.
  • FIG. 21 is a block diagram illustrating a structure of an FO detection apparatus corresponding to the embodiment of FIG. 20.
  • the FO detecting apparatus 2100 includes a first quality factor measuring unit 2110, a second quality factor measuring unit 2120, a detector 2130, an alarm unit 2140, and a controller 2150.
  • the first quality factor measuring unit and the second quality factor measuring unit may be integrated into one module or device.
  • the same measurement unit may measure the first quality factor value and the second quality factor value according to the operating frequency adjustment of the controller 2150.
  • the same measurement unit may measure the maximum quality factor value according to the operating frequency adjustment of the controller and store the peak factor frequency of the quality factor corresponding to the maximum quality factor value in the memory.
  • the first quality factor measuring unit 2110 may measure a first quality factor value corresponding to the first frequency within a preset operating frequency band.
  • the second quality factor measuring unit 2120 may measure a second quality factor value corresponding to the second frequency in the preset operating frequency band.
  • the second frequency is greater than the first frequency
  • the frequency difference between the first frequency and the second frequency may be determined based on the bandwidth of the band of the operating frequency band, but is not limited thereto.
  • the first frequency and the second frequency may be determined as the lower limit frequency and the upper limit frequency of the operating frequency band, respectively.
  • the detector 2130 may determine whether foreign matter exists in the charging region based on the first quality factor value and the second quality factor value. Alternatively, it may be determined whether foreign matter exists in the charging region based on the quality factor peak operating frequency and the reference quality factor peak operating frequency received from the wireless power receiver.
  • the detector 2130 may determine that a wireless power receiver in which foreign substances are arranged or not arranged on the charging region. On the other hand, if the second quality factor value is less than the first quality factor value, the detector 2130 may determine that the wireless power receivers arranged on the charging area are arranged.
  • the detector 2930 may determine that a foreign power is arranged or a wireless power receiver in which the foreign matter is not arranged on the charging region.
  • the detector 2130 may be arranged in the wireless power receiver. It can be determined that is arranged.
  • the detector 2130 may determine that a foreign power is disposed on the charging region or a wireless power receiver in which the foreign material is not arranged on the charging region based on a change ratio of the quality factor value according to the frequency change in the operating frequency band.
  • the change ratio may be calculated by dividing the value obtained by subtracting the first quality factor value from the second quality factor value by the first quality factor value, but is not limited thereto, and calculating a change ratio of the quality factor value according to the frequency change. Equation that can be done is enough.
  • the detector 2130 may determine that a foreign power is disposed or the wireless power receiver is not arranged in the charging area.
  • the detector 2130 may determine that the wireless power receivers arranged on the charging area are arranged.
  • the detector 2130 may transmit a detection result to the controller 2150 when a foreign substance or an unaligned wireless power receiver is detected.
  • the alarm unit 2140 may output a predetermined alarm signal indicating that there is a foreign power or an unaligned wireless power receiver on the charging area under the control of the controller 2150.
  • the alarm means may include a buzzer, an LED lamp, a vibration, a liquid crystal display, and the like, but is not limited thereto.
  • the controller 2150 controls the power transmitter 2160 of FIG. 20 to stop power transmission when power is currently being transmitted.
  • the alarm unit 2140 may be controlled to output a predetermined alarm signal indicating that a foreign object or an unaligned wireless power receiver is disposed.
  • the controller 2150 may enter the selection step after waiting for a predetermined time after outputting the alarm signal and search for the receiver again.
  • the time to wait before entering the selection step may be determined in consideration of the time taken for the wireless power receiver that is not removed or aligned by the user to be disposed in the charging area by the user.
  • control unit 2150 may measure the quality factor values for the first frequency and the second frequency before entering the selection step. 2120 may be controlled and the measured first to second quality factor values may be compared to determine whether the foreign matter disposed in the filling region has been removed. When the removal of the foreign matter is confirmed, the controller 2150 may enter a selection step.
  • the control unit 2150 controls to measure the quality factor values for the first frequency and the second frequency before entering the selection step, and measures the measured first to second quality factors. Based on the value, it may be confirmed whether the wireless power receiver is normally aligned. As a result of the check, when the wireless power receiver is normally aligned, the controller 2150 may enter a selection step.
  • the foreign material detection step may be performed in a selection step, that is, before the ping step. In this case, if the foreign matter is detected in the selection step, the wireless power transmitter may maintain the selection step without entering the ping step.
  • the controller 2150 suspends the power transmission when foreign matter is detected during the power transmission to the wireless power receiver-that is, the power transmission step 260 of FIG.
  • a predetermined alarm signal indicating that the foreign matter is detected may be output.
  • the controller 2150 may control the power transmission to be resumed.
  • FIG. 22 is a flowchart illustrating a method of detecting FO based on a quality factor value according to another embodiment of the present invention.
  • the wireless power transmitter may divide a preset operating frequency band into first to Nth frequencies having a predetermined frequency interval (S2201).
  • the operating frequency band may be largely divided into a lower limit frequency band, an intermediate frequency band, and an upper limit frequency band.
  • the size of each frequency band may vary according to user settings. As an example, when the operating frequency band is between 100KHz and 210KHz, and the frequency interval for distinguishing a specific frequency within the operating frequency band is set to 10KHz, the operating frequency band may be divided into first to twelfth frequencies.
  • the first to third frequencies are the lower limit frequency band (100KHz to 130KHz)
  • the fourth to ninth frequencies are the intermediate frequency band (130KHz to 180KHz)
  • the tenth to twelfth frequencies are the upper limit frequency band (180KHz to 210KHz).
  • the wireless power transmitter may calculate an average value a1 of the quality factor value (s) measured for the (N-K + 1) th frequency to the Nth frequency included in the upper limit frequency band (S2203).
  • the wireless power transmitter may calculate an average value a2 of the quality factor value (s) measured for the first to K th frequencies included in the upper frequency band (S2205).
  • the wireless power transmitter may compare the sizes of a1 and a2 (S2207).
  • the wireless power transmitter determines that the wireless power receivers arranged in the charging region are arranged. It is possible (S2209).
  • a high coupling coefficient between the transmission resonant coil (primary coil) and the reception resonant coil (secondary coil) may refer to a well-aligned state.
  • the wireless power transmitter may determine that a foreign object or an unaligned wireless power receiver is disposed on the charging region (S2211).
  • the wireless power transmitter may output a predetermined alarm signal indicating that a foreign object or an unaligned wireless power receiver is disposed on the charging area (S2213).
  • the wireless power transmitter may perform the above-described steps 2201 to 2213 in the selection step 510 of FIG. 5, but this is only one embodiment, which is one of the steps before the negotiation step 540.
  • the wireless power transmitter may perform steps 2201 to 2213 in the power transmission step 560 of FIG. 5.
  • the wireless power transmitter may measure a quality factor value for each frequency during power control using operating frequency adjustment.
  • the wireless power transmitter calculates the quality factor average value of the upper limit frequency band and the quality factor average value of the lower limit frequency band by using the measured quality factor value for each frequency and compares the average to determine whether there is a foreign substance in the charging region. It may be.
  • the wireless power transmitter according to another embodiment of the present invention is further based on the amount or increase or decrease of the average value of the quality factor according to the frequency change, the foreign matter or alignment It may be determined whether a wireless power receiver which is not in the charging area is disposed.
  • the wireless power transmitter may be configured as a foreign object or an unaligned wireless power receiver disposed on the charging region. You can judge.
  • FIG. 23 is a block diagram illustrating a structure of an FO detection apparatus corresponding to the embodiment of FIG. 22.
  • the FO detecting apparatus 2300 may include an operating frequency divider 2310, a quality factor measurer 2320, an average calculator 2330, a detector 2340, an alarm 2350, and a controller 2360. It may be configured to include).
  • the operating frequency dividing unit 2310 divides the predefined operating frequency band into predetermined frequency intervals and divides the first to Nth frequencies to measure quality factor values, and divides the divided frequencies into a lower limit frequency band, an intermediate frequency band, and an upper limit. It can be divided into frequency bands.
  • the number of measurement target frequencies included in the lower limit frequency band and the lower limit frequency band may be predefined and maintained in a predetermined recording area.
  • the operating frequency band, the frequency interval, and the number of frequencies to be measured included in the lower and upper limit frequency bands may be determined by a predetermined user interface means installed in the wireless power transmitter and / or an external device interworking with the corresponding wireless power transmitter through a wired or wireless communication network. Note that this can be changed via the server.
  • the quality factor measuring unit 2320 may measure a quality factor value corresponding to the first to Nth frequencies. According to an exemplary embodiment, the quality factor measuring unit 2340 may measure only the quality factor values of the measurement target frequencies included in the lower limit frequency band and the upper limit frequency band.
  • the average calculator 2330 may calculate an average value a2 of the quality factor value (s) measured for the lower limit frequency band and an average value a1 of the quality factor value (s) measured for the upper limit frequency band. have.
  • the detector 2340 may detect a foreign object or an unaligned wireless power receiver disposed on the charging area based on a1 and a2, and may transmit a detection result to the controller 2360. As an example, the detector 2340 may determine that the value obtained by subtracting a2 from a1 is positive, that is, when the average of the quality factor values increases as the frequency in the operating frequency band increases. It can be determined that the receiver exists. On the other hand, the detector 2340 is negative when a value minus a2 is negative, that is, when the frequency in the operating frequency band increases as the average of the quality factor values decreases. It can be judged that.
  • the detector 2340 may be charged with a foreign material or an unaligned wireless power receiver in consideration of the increase / decrease amount of the quality factor average value as well as whether the quality factor average value increases or decreases according to the frequency change in the operating frequency band. It may also be determined whether it is arranged in the area. For example, when a2 minus a1 is negative and the absolute value of the difference between a2 and a1 exceeds a predetermined threshold, the wireless power transmitter may determine that a foreign object or an unaligned wireless power receiver is disposed on the charging region. Can be.
  • the alarm unit 2350 may output a predetermined alarm signal indicating that there is a foreign power or an unaligned wireless power receiver on the charging area under the control of the controller 2360.
  • the alarm means may include a buzzer, an LED lamp, a vibration, a liquid crystal display, and the like, but is not limited thereto.
  • 24A to 24D are graphs of experimental results for explaining the logical basis of the embodiments of FIGS. 20 to 23.
  • the quality factor value measured by the wireless power transmitter decreases as the frequency in the operating frequency band (100 KHz to 210 KHz) increases. Shows. .
  • the quality factor value measured by the wireless power transmitter increases as the frequency in the operating frequency band increases.
  • the quality factor value measured at 100 KHz is 44 and the quality factor value measured at 210 KHz is 40.
  • the quality factor value measured at the operating frequency of 100 KHz is 27.1 and the quality factor value measured at the operating frequency of 210 KHz is 30.5.
  • FO4 means the foreign matter of the standard specification defined in the WPC standard.
  • the quality factor value decreases as the frequency in the operating frequency band increases, but when the foreign matter is disposed in the charging region, the operating frequency It shows that the quality factor value increases as the in-band frequency increases.
  • 24B is an experimental result of a second receiver produced by a different manufacturer from the first receiver of FIG. 24A.
  • the quality factor value measured by the wireless power transmitter is a quality factor value as the frequency in the operating frequency band (100 KHz to 210 KHz) increases. Shows this decreases.
  • the quality factor value measured by the wireless power transmitter increases as the frequency in the operating frequency band increases.
  • the quality factor value decreases as the frequency in the operating frequency band increases.
  • the quality factor value increases as the frequency in the operating frequency band is increased.
  • FIG. 24C shows the quality factor values measured for FO4 and 10 cent coins as foreign matter defined in the standard in the operating frequency band.
  • Reference numerals 2431 and 2432 of FIG. 24C show the pattern of change of the quality factor values measured for the 10 cent coin and the FO4, respectively. As shown in FIGS. 2431 and 2432, when a foreign material other than the wireless power receiver is placed in the charging region, it can be seen that the quality factor value increases as the frequency in the operating frequency band increases.
  • 24D shows experimental results of a third receiver released by a different manufacturer from the first to second receivers described above.
  • the quality factor value decreases with increasing frequency, but as shown in FIGS. If an additional FO4 or 10 cents is placed, the quality factor value increases with increasing frequency.
  • 24E shows experimental results of a standard wireless power transmitter and a standard wireless power receiving module used for product certification.
  • the quality factor value decreases as the frequency in the operating frequency band increases.
  • reference numeral 2451 even if nothing is placed in the charging region of the standard wireless power transmitter, it can be seen that the quality factor value decreases as the frequency in the operating frequency band increases.
  • reference numeral 2453 it can be seen that the measured quality factor value becomes smaller overall as compared to the case where nothing is placed in the charging region while the standard wireless power receiving module is disposed in the charging region of the standard wireless power transmitter. Can be.
  • FIG. 25 is a diagram illustrating a relationship between a quality factor value and a maximum quality factor peak frequency according to the arrangement of a wireless power receiver and a foreign object in a charging region of the wireless power transmitter.
  • the table shown in FIG. 25 shows how the maximum quality factor peak frequency shifts when only the wireless power receiver is placed in the charging region and when the wireless power receiver and the foreign body are placed together in the charging region. At this time, the presence of the foreign matter may be determined using the maximum quality factor peak frequency.
  • the wireless power transmitter may receive information regarding a reference quality factor peak frequency from the wireless power receiver and determine a threshold frequency based on the received information.
  • the threshold frequency may be determined in consideration of the coil design, circuit characteristics, and error. By comparing the threshold frequency with the peak frequency of FIG. 25, the wireless power transmitter may determine whether a foreign substance exists.
  • FIG. 26 is a view for explaining a state transition procedure for detecting a foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus may measure quality factor values of a resonance circuit for a plurality of operating frequencies (S2601).
  • the number of operating frequencies at which the quality factor value is measured may be 2 to 6, but is not limited thereto.
  • the operating frequency value at which the quality factor value is measured is a value selected within a predefined operating frequency range and may be selected to have a constant frequency interval. For example, when the operating frequency range of the foreign matter detection device is from 100KHz to 220KHz, and the number of operating frequencies measured is 5, the operating frequency values at which the quality factor values are measured may be 100KHz, 130KHz, 160KHz, 190KHz, and 220KHz. .
  • the foreign matter detection apparatus may determine whether the foreign matter is disposed in the filling region, that is, the presence of the foreign matter, based on the measured quality factor values (S2602).
  • the foreign matter detection apparatus may determine that the foreign matter exists in the charging region when the quality factor value increases as the operating frequency increases. On the other hand, when the quality factor value decreases as the operating frequency is increased, the foreign matter detection apparatus may determine that there is no foreign matter in the charging region.
  • the foreign matter detection apparatus calculates a change amount of a quality factor value for an adjacent operating frequency, and the average of the calculated change amounts exceeds a predetermined reference value, for example, the reference value may be 0, but is not limited thereto.
  • the reference value may be 0, but is not limited thereto.
  • the adjacent operating frequency means the two operating frequencies closest to the operating frequency of the quality factor value is measured.
  • the foreign matter detection apparatus may calculate a slope of a quality factor value with respect to an adjacent operating frequency, and when the average of the calculated slopes exceeds a predetermined first reference value, the foreign matter detection apparatus may determine that the foreign matter exists in the charging region. .
  • the average of the calculated slope is less than or equal to the predetermined second reference value, it may be determined that no foreign matter exists in the charging region.
  • the first reference value and the second reference value may have different values, in which case, the first reference value is larger than the second reference value.
  • the foreign matter detection apparatus may enter the ping step 2620 when the determination of the presence of the foreign matter is completed.
  • the foreign matter detection apparatus may periodically transmit a predetermined power signal, for example, a digital ping, to identify the wireless power receiver.
  • a predetermined power signal for example, a digital ping
  • the foreign matter detection apparatus may enter the identification and configuration step 2630 to identify the wireless power receiver, and set various configuration parameters for the identified wireless power receiver.
  • the foreign matter detection apparatus may enter a negotiation step 2640 to receive a foreign matter detection status packet (FOD Status Packet) from the identified wireless power receiver (S2603).
  • the foreign matter detection status packet may include a reference quality factor value.
  • the foreign matter detection apparatus may transmit a NAK response signal or an ACK response signal to the identified wireless power receiver according to the determination result of step 2602 (S2604). In this case, the foreign matter detection apparatus may not determine a threshold (or threshold range) for determining whether the foreign matter exists based on the received foreign matter detection status packet. As a result of the determination in step 2602, when the foreign matter is present, the foreign matter detection apparatus may transmit the NAK response signal to the identified wireless power receiver and then transition to the selection step 2610. In this case, the foreign matter detection apparatus may stop the power transmission and output a predetermined warning alarm indicating that the foreign matter has been detected.
  • the foreign matter detection apparatus may transmit to the power transmission step 2650 after transmitting the ACK response signal.
  • the foreign matter detection apparatus may transition to the power transmission step 2650 through the correction step 550 of FIG. 5.
  • the foreign matter detection apparatus may enter the power transmission step 2650 to initiate wireless charging of the corresponding wireless power receiver.
  • the foreign substance detecting apparatus transitioned to the selection step 2610 according to the foreign substance detection may periodically measure the quality factor values of the resonant circuits for the plurality of operating frequencies and determine whether the foreign substances have been removed based on the measured quality factor values. have. As a result of the determination, when the foreign matter is removed, the foreign matter detection device may enter the power transmission step 2650 and resume power transmission to the corresponding wireless power receiver. On the other hand, when the detected foreign matter is not removed for a predetermined time after the transition to the selection step 2610 according to the foreign matter detection, the foreign matter detection device may output a predetermined warning alarm indicating that the detected foreign matter has not been removed. .
  • the foreign matter detection apparatus transmits a predetermined foreign matter presence status packet including the FO status information corresponding to the determination result of step 2601 to the corresponding wireless power receiver. You can also send more. For example, when the foreign substance state information is '0', it may mean that the foreign substance is not detected, and if it is '1', it may mean that the foreign substance is detected, but is not limited thereto.
  • the S2603 packet may be omitted.
  • FIG. 27 is a diagram illustrating a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 2700 may have a length of 2 bytes, and a 6-bit first data 2701 field, a 2-bit mode 2702 field, and a 1-byte length. It may be configured to include a reference quality factor value (2703) field of.
  • the mode 2702 field when the mode 2702 field is set to binary '00', all bits of the first data 2701 field are written as 0, corresponding to the reference quality factor value 2703 field.
  • the reference quality factor value measured and determined while the power receiver is turned off is recorded.
  • the mode 2702 field is set to binary '01', the quality factor value measured when the wireless power receiver is turned off is 5% lower than the reference quality factor value in the first data 2701 field.
  • the operating frequency can be recorded.
  • a reference quality factor value measured and determined while the power of the corresponding wireless power receiver is turned off may be recorded. For example, referring to FIG.
  • the reference quality factor value of the receiver 2 may be 39.5 measured when the operating frequency is 100 KHz. At this time, the quality factor value 5% lower than the reference quality factor value is 37.525. Therefore, the operating frequency having a quality factor value 5% lower than the reference quality factor value may be any value between 120 KHz and 130 KHz.
  • a value corresponding to an operating frequency having a quality factor value 5% lower than the reference quality factor value is described as being recorded in the first data 2701 field.
  • this is only an example. It may be set to a value other than 5%, for example, 7%, according to the design of a person skilled in the art.
  • FIG. 28 is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus may measure quality factor values of a resonance circuit for a plurality of operating frequencies including a lower limit frequency of an operating frequency band (S2801). .
  • the number of operating frequencies at which the quality factor value is measured may be 2 to 8, but the present invention is not limited thereto.
  • the operating frequencies at which the quality factor value is measured are values selected within a predefined operating frequency range, and may be selected to have a predetermined frequency interval, but are not limited thereto and may be arbitrarily selected within the operating frequency range.
  • the operating frequency range of the foreign matter detection device may be from 100KHz to 220KHz.
  • the operating frequency values at which the quality factor values are measured may be 100KHz, 120KHz, 140KHz, 160KHz, 180KHz, 200KHz and 220KHz.
  • the foreign substance detection apparatus may record the quality factor value measured for each operating frequency in a predetermined recording area.
  • the foreign matter detection device may enter the ping step 2820 when the quality factor value measurement is completed.
  • the foreign matter detection apparatus may periodically transmit a predetermined power signal, eg, a digital ping, to identify the wireless power receiver.
  • a predetermined power signal eg, a digital ping
  • the foreign matter detection apparatus may enter the identification and configuration step 2830 to identify the wireless power receiver and set various configuration parameters for the identified wireless power receiver.
  • the foreign matter detection apparatus may enter a negotiation step 2840 to receive a foreign matter detection status packet (FOD Status Packet) from the identified wireless power receiver (S2802).
  • FOD Status Packet a foreign matter detection status packet
  • the foreign matter detection status packet may include information about an operating frequency having a quality factor value 5% lower than the reference quality factor value—a business card called “critical frequency” for convenience of description below.
  • the foreign matter detection apparatus may determine whether there is a foreign matter by comparing the quality factor value Q1 corresponding to the lower limit frequency measured in step 2801 with the quality factor value Q2 measured at an operating frequency larger than the threshold frequency (see FIG. 2801). S2803).
  • Q2 may be a quality factor value having the largest value among quality factor values measured at operating frequencies greater than the threshold frequency.
  • the foreign matter detection device may determine that the foreign matter is disposed in the charging region. On the other hand, if Q2 is smaller than Q1, the foreign matter detection device may determine that no foreign matter is disposed in the charging region.
  • the foreign matter detection apparatus may determine (or estimate) a quality factor value corresponding to the threshold frequency based on the quality factor value for each operating frequency measured in step 2801. For example, when a frequency equal to a threshold frequency is included among the plurality of operating frequencies used to measure the quality factor value in step 2801, the quality factor value measured at the corresponding operating frequency becomes the quality factor value measured at the threshold frequency. However, if a frequency equal to the threshold frequency is not included among the plurality of operating frequencies used to measure the quality factor value in step 2801, the threshold frequency is based on the at least one quality factor value measured at the operating frequency closest to the threshold frequency.
  • a quality factor value corresponding to may be estimated. For example, a linear function may be derived using the quality factor values measured at the two operating frequencies closest to the threshold frequency, and the quality factor value corresponding to the threshold frequency may be estimated by substituting the threshold frequency into the derived linear function. It is not limited to this.
  • the foreign matter detection apparatus may transmit a NAK response signal or an ACK response signal to the identified wireless power receiver according to the determination result of step 2803 (S2804). In this case, the foreign matter detection apparatus may not determine a threshold (or threshold range) for determining whether the foreign matter exists based on the received foreign matter detection status packet. As a result of the determination in step 2803, when the foreign matter is present, the foreign matter detection apparatus may transmit the NAK response signal to the identified wireless power receiver and then transition to the selection step 2810. In this case, the foreign matter detection apparatus may stop the power transmission and output a predetermined warning alarm indicating that the foreign matter has been detected.
  • the foreign matter detection apparatus may transmit to the power transmission step 2850 after transmitting the ACK response signal.
  • the foreign matter detection apparatus may transition to the power transmission step 2850 through the correction step 550 of FIG. 5 when no foreign matter exists.
  • the foreign matter detection apparatus may enter a power transmission step 2850 to initiate wireless charging for the corresponding wireless power receiver.
  • the foreign substance detecting apparatus transitioned to the selection step 2810 according to the foreign substance detection may periodically measure the quality factor values of the resonant circuits for the plurality of operating frequencies and determine whether the foreign substances have been removed based on the measured quality factor values. have. As a result of the determination, when the foreign matter is removed, the foreign matter detection device may enter the power transmission step 2850 and resume power transmission to the corresponding wireless power receiver. On the other hand, if the detected foreign matter is not removed for a predetermined time after the transition to the selection step 2810 according to the foreign matter detection, the foreign matter detection device may output a predetermined warning alarm indicating that the detected foreign matter has not been removed. .
  • the foreign matter detection apparatus transmits a foreign matter presence status packet including the foreign matter status information corresponding to the determination result of step 2801 to the corresponding wireless power receiver. You can also send more. For example, when the foreign substance state information is '0', it may mean that the foreign substance is not detected, and if it is '1', it may mean that the foreign substance is detected, but is not limited thereto.
  • 29 is a view for explaining a state transition procedure for the detection of foreign matter in the foreign matter detection apparatus according to an embodiment of the present invention.
  • the foreign matter detection apparatus may measure the quality factor values of the resonant circuit for the plurality of operating frequencies (S2901).
  • the foreign matter detection apparatus may identify at least two or more operating frequencies greater than or equal to the threshold frequency and extract the measured quality factor value from the identified operating frequency. (S2903).
  • the foreign matter detection apparatus may determine whether the foreign matter exists by comparing the quality factor values corresponding to each of the operating frequencies greater than or equal to the threshold frequency (S2904). For example, when the quality factor value increases as the operating frequency increases, the foreign matter detection apparatus may determine that the foreign matter exists in the charging region. On the other hand, when the quality factor value decreases as the operating frequency increases, the foreign matter detection apparatus may determine that no foreign matter exists in the charging region.
  • the foreign matter detection apparatus may scan the quality factor value in the operating frequency band when an object is detected in the selection step.
  • the operating frequency band may be divided into a plurality of lower frequency regions which do not overlap each other.
  • the operating frequency band may be divided into a first frequency region including a lower limit frequency and a second frequency region including an upper limit frequency.
  • the first frequency region may be 100KHz to 150KHz including the lower limit frequency 100KHz, and the second frequency region may be 151KHz to 200KHz including the 200KHz upper limit frequency.
  • the foreign material detecting apparatus scans the quality factor value while changing the frequency in the first frequency domain by a predetermined frequency unit, and identifies the operating frequency (first frequency) at which the highest quality factor value is measured.
  • the foreign matter detection apparatus may scan the quality factor value while changing the frequency in the second frequency domain, and identify the operating frequency (second frequency) at which the highest quality factor value is measured.
  • the foreign matter detection apparatus may compare the quality factor value Q4 corresponding to the first frequency with the quality factor value Q5 corresponding to the second frequency to determine whether the foreign substance exists in the charging region. For example, when Q5 is greater than Q4, the foreign matter detection device may determine that the foreign matter exists. On the contrary, if Q5 is smaller than Q4, the foreign matter detection device may determine that there is no foreign matter.
  • FIG. 30 is a diagram for explaining a message structure of a FOD status packet according to another embodiment of the present invention.
  • the FOD status packet message 3000 may have a length of 2 bytes, and a 6-bit length reservation 3001 field, a 2-bit length mode 3002 field, and the first data 3003. ) Field and the second data field 3004.
  • the size of the first data 3003 field is 3 bits and the size of the field of the second data 3004 is 5 bits. However, this is only one embodiment. It is not limited to this. All bits of the reservation 3001 field are written as zeros.
  • the mode 3002 field when the mode 3002 field is set to the binary number '00', the first data 3003 field and the second data 3004 field are in a state where the corresponding wireless power receiver is turned off. The measured and determined reference quality factor values are recorded.
  • the mode 3002 field is set to binary '01', the threshold frequency information in the first data 3003 field corresponds to the threshold frequency to the quality factor value corresponding to the lower limit frequency in the second data 3004 field. Rate information of the quality factor values may be recorded respectively.
  • 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 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 foreign matter detection method according to the embodiment may be used in a wireless charging system that detects foreign matter located between the wireless power transmitter and the wireless power transmitter before the ping step, the negotiation step, and the power transmission step by using the quality factor value.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Power Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne un procédé de détection d'un corps étranger, ainsi qu'un dispositif et un système associés. Le procédé de détection d'un matériau étranger dans un émetteur de puissance sans fil pourvu d'un circuit de résonance pour la transmission sans fil de puissance selon un mode de réalisation de la présente invention comprend : une étape de détection d'un objet disposé dans une zone de charge; une étape de mesure d'une valeur de facteur de qualité d'un circuit de résonance, après la détection de l'objet; une étape d'identification d'un récepteur de puissance sans fil par envoi d'un signal de détection; une étape de détermination d'une valeur critique pour détecter un matériau étranger, sur la base d'une valeur de facteur de qualité de référence reçue depuis le récepteur de puissance sans fil identifié; et une étape de détermination du fait que le matériau étranger existe ou non, par comparaison de la valeur de facteur de qualité mesurée et la valeur critique déterminée, la valeur critique pouvant être déterminée par application d'un poids qui augmente en fonction de la valeur de facteur de qualité de référence. En conséquence, la présente invention présente l'avantage de détecter un matériau étranger de façon plus efficace et plus précise.
PCT/KR2017/006975 2016-07-01 2017-06-30 Procédé de détection de matériau étranger, et dispositif et système associés WO2018004304A1 (fr)

Priority Applications (42)

Application Number Priority Date Filing Date Title
CN202211009592.4A CN115603473A (zh) 2016-07-01 2017-06-30 与无线电力发送器通信的方法和无线电力接收器
EP17820580.3A EP3480588B1 (fr) 2016-07-01 2017-06-30 Procédé de détection de matériau étranger, et dispositif et système associés
CN202211008315.1A CN115603472A (zh) 2016-07-01 2017-06-30 检测充电区域中的异物的方法和无线电力发送器
US16/314,559 US11070095B2 (en) 2016-07-01 2017-06-30 Method for detecting foreign material, and device and system therefor
JP2018567818A JP2019526220A (ja) 2016-07-01 2017-06-30 異物質検出方法及びそのための装置及びシステム
CN201780053470.6A CN109952503B (zh) 2016-07-01 2017-06-30 用于检测异物的方法及其设备和系统
US16/539,511 US10916973B2 (en) 2016-07-01 2019-08-13 Method for detecting foreign material, and device and system therefor
US17/318,000 US11646607B2 (en) 2016-07-01 2021-05-12 Method for detecting foreign material, and device and system therefor
JP2022142911A JP2022172339A (ja) 2016-07-01 2022-09-08 異物質検出方法及びそのための装置及びシステム
US18/298,896 US20230275469A1 (en) 2016-07-01 2023-04-11 Method for detecting foreign material, and device and system therefor
JP2023115056A JP2023134642A (ja) 2016-07-01 2023-07-13 異物質検出方法及びそのための装置及びシステム
JP2023118326A JP2023134759A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/355,929 US20230369902A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118451A JP2023139138A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/355,935 US20230369903A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118335A JP2023134761A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118373A JP2023134766A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118348A JP2023134763A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/356,047 US20230361623A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/355,896 US20230361620A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/356,050 US20230369911A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118362A JP2023134765A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118436A JP2023134773A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118350A JP2023134764A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/356,041 US20230369910A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118386A JP2023134767A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118343A JP2023134762A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/355,909 US20230361622A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/356,021 US20230378819A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/356,019 US20230369909A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118414A JP2023134770A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/355,998 US20230369906A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/355,898 US20240030751A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118417A JP2023134771A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
JP2023118429A JP2023134772A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/356,028 US20240006926A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118332A JP2023134760A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/356,010 US20230369908A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118438A JP2023139137A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム
US18/355,891 US20240030750A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
US18/355,944 US20230369904A1 (en) 2016-07-01 2023-07-20 Method for detecting foreign material, and device and system therefor
JP2023118458A JP2023139139A (ja) 2016-07-01 2023-07-20 異物質検出方法及びそのための装置及びシステム

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR10-2016-0083406 2016-07-01
KR1020160083406A KR20180003810A (ko) 2016-07-01 2016-07-01 이물질 검출 방법 및 그를 위한 장치 및 시스템
KR10-2016-0090701 2016-07-18
KR20160090701 2016-07-18
KR1020160093483A KR102576401B1 (ko) 2016-07-22 2016-07-22 이물질 검출 방법 및 그를 위한 장치 및 시스템
KR10-2016-0093483 2016-07-22
KR10-2016-0095293 2016-07-27
KR1020160095293A KR102628358B1 (ko) 2016-07-18 2016-07-27 이물질 검출 방법 및 그를 위한 장치 및 시스템

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US16/314,559 A-371-Of-International US11070095B2 (en) 2016-07-01 2017-06-30 Method for detecting foreign material, and device and system therefor
US16/539,511 Continuation US10916973B2 (en) 2016-07-01 2019-08-13 Method for detecting foreign material, and device and system therefor
US17/318,000 Continuation US11646607B2 (en) 2016-07-01 2021-05-12 Method for detecting foreign material, and device and system therefor

Publications (1)

Publication Number Publication Date
WO2018004304A1 true WO2018004304A1 (fr) 2018-01-04

Family

ID=60786086

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/006975 WO2018004304A1 (fr) 2016-07-01 2017-06-30 Procédé de détection de matériau étranger, et dispositif et système associés

Country Status (1)

Country Link
WO (1) WO2018004304A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108923552A (zh) * 2018-07-27 2018-11-30 浙江泰米电子科技有限公司 一种无线充电异物检测电路及方法
CN114056137A (zh) * 2020-07-29 2022-02-18 Tdk株式会社 异物检测装置、供电装置、受电装置及电力传输系统
JP7474253B2 (ja) 2018-11-19 2024-04-24 イグス ゲゼルシャフト ミット ベシュレンクター ハフトゥング ライン案内装置、特に、エネルギーチェーンにおいてケーブルを監視するためのシステム

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140102553A (ko) * 2013-02-14 2014-08-22 주식회사 스파콘 무선 전력 전송 시스템에서 이물질 감지 장치 및 방법
KR20140110500A (ko) * 2013-03-08 2014-09-17 삼성전자주식회사 무선 전력 송신기 및 그 제어 방법
KR20150143654A (ko) * 2013-04-19 2015-12-23 캐논 가부시끼가이샤 송전 장치, 송전 장치를 제어하는 방법, 및 송전 시스템
KR101603420B1 (ko) * 2013-11-18 2016-03-14 리치테크 테크놀로지 코포레이션 전력 계산방법
KR20160061121A (ko) * 2014-11-21 2016-05-31 엘지이노텍 주식회사 무선 전력 송신 장치 및 그의 이물질 검출 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140102553A (ko) * 2013-02-14 2014-08-22 주식회사 스파콘 무선 전력 전송 시스템에서 이물질 감지 장치 및 방법
KR20140110500A (ko) * 2013-03-08 2014-09-17 삼성전자주식회사 무선 전력 송신기 및 그 제어 방법
KR20150143654A (ko) * 2013-04-19 2015-12-23 캐논 가부시끼가이샤 송전 장치, 송전 장치를 제어하는 방법, 및 송전 시스템
KR101603420B1 (ko) * 2013-11-18 2016-03-14 리치테크 테크놀로지 코포레이션 전력 계산방법
KR20160061121A (ko) * 2014-11-21 2016-05-31 엘지이노텍 주식회사 무선 전력 송신 장치 및 그의 이물질 검출 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3480588A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108923552A (zh) * 2018-07-27 2018-11-30 浙江泰米电子科技有限公司 一种无线充电异物检测电路及方法
JP7474253B2 (ja) 2018-11-19 2024-04-24 イグス ゲゼルシャフト ミット ベシュレンクター ハフトゥング ライン案内装置、特に、エネルギーチェーンにおいてケーブルを監視するためのシステム
CN114056137A (zh) * 2020-07-29 2022-02-18 Tdk株式会社 异物检测装置、供电装置、受电装置及电力传输系统
CN114056137B (zh) * 2020-07-29 2023-07-07 Tdk株式会社 异物检测装置、供电装置、受电装置及电力传输系统

Similar Documents

Publication Publication Date Title
WO2018004120A1 (fr) Procédé de détection de corps étrangers, et appareil et système associés
WO2018004117A1 (fr) Procédé et dispositif de commande de puissance sans fil pour une charge sans fil
WO2019031748A1 (fr) Procédé de détection corps étranger destiné à une charge sans fil et dispositif associé
WO2018105915A1 (fr) Procédé de détection d'objet étranger et son appareil
WO2017217663A1 (fr) Procédé de détection de corps étrangers, et appareil et système correspondants
WO2016006892A1 (fr) Procédé, appareil et système de transfert d'énergie sans fil
WO2016024700A1 (fr) Système de transfert d'énergie sans fil et système de recharge sans fil
WO2017164525A1 (fr) Système de charge sans fil et dispositif à cet effet
WO2018106072A1 (fr) Procédé de détection de substance étrangère pour charge sans fil et appareil associé
WO2015060570A1 (fr) Procédé, appareil et système de transfert d'énergie sans fil
WO2018056633A1 (fr) Procédé de transmission d'énergie sans fil et dispositif associé
WO2014200247A1 (fr) Procédé de transfer d'énergie sans fil, émetteur d'énergie sans fil et système de charge sans fil
WO2016182208A1 (fr) Procédé de transfert d'énergie sans fil, procédé de réception d'énergie sans fil, et appareil correspondant
WO2018080049A1 (fr) Bobine de charge sans fil d'émetteur et de récepteur d'énergie sans fil, et procédé de production associé
WO2015080539A1 (fr) Procédé, appareil et système de transfert de puissance sans fil
WO2016080594A1 (fr) Dispositif d'émission de puissance sans fil, dispositif de réception de puissance sans fil, et système de charge sans fil
EP3158622A1 (fr) Procédé, appareil et système de transfert d'énergie sans fil
WO2018124669A1 (fr) Procédé de charge sans fil et appareil et système associés
WO2014007415A1 (fr) Procédé et appareil pour changer périodiquement une fréquence dans un transfert de puissance sans fil
WO2019225806A1 (fr) Procédé et dispositif de transmission de puissance sans fil
WO2018093041A1 (fr) Antenne multimode et dispositif de réception d'énergie sans fil la comportant
WO2017018668A1 (fr) Procédé et appareil d'identification de récepteur d'énergie sans fil
WO2015119458A1 (fr) Procédé, appareil et système de transfert et de réception d'énergie sans fil
EP3172813A1 (fr) Procédé, appareil et système de transfert de puissance sans fil
WO2018004116A1 (fr) Procédé et dispositif de transmission de puissance sans fil dans un système de charge sans fil

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17820580

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2018567818

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2017820580

Country of ref document: EP

Effective date: 20190201