WO2022148598A1 - Verfahren zum betrieb einer drahtlosen übertragungsvorrichtung zur erkennung und vermeidung unerwünschter abstrahlungen von hochfrequenten feldern - Google Patents
Verfahren zum betrieb einer drahtlosen übertragungsvorrichtung zur erkennung und vermeidung unerwünschter abstrahlungen von hochfrequenten feldern Download PDFInfo
- Publication number
- WO2022148598A1 WO2022148598A1 PCT/EP2021/085142 EP2021085142W WO2022148598A1 WO 2022148598 A1 WO2022148598 A1 WO 2022148598A1 EP 2021085142 W EP2021085142 W EP 2021085142W WO 2022148598 A1 WO2022148598 A1 WO 2022148598A1
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- WIPO (PCT)
- Prior art keywords
- energy transmission
- measuring
- transmission device
- operating
- measuring device
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000001939 inductive effect Effects 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims description 6
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 11
- 230000005672 electromagnetic field Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 208000003443 Unconsciousness Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 239000002023 wood Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
- B60L53/122—Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
- B60L53/124—Detection or removal of foreign bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
Definitions
- the present invention relates to a method for operating a wireless energy transmission device, for example for charging an energy store of an electric vehicle, which includes a transmission coil suitable for the inductive transmission of electrical energy with a transmission coil control unit, wherein the inductive energy transmission device also includes a measuring device with a measuring element. Also includes the inductive
- the inductive energy receiving device for the inductive reception of electrical energy receiving coil suitable with a receiving coil control unit, wherein the inductive energy receiving device also comprises a measuring device with a measuring element.
- the measuring element measures the field strength of the alternating magnetic field in an air gap between the transmitting coil and the receiving coil in connection with the first measuring device.
- the transmission coil control unit adjusts an operating point of the energy transmission device, taking into account the field strength value measured with the measuring element, such that the efficiency of the energy transmission device is maximized.
- the wireless transmission of electrical energy for the energy supply of electrical devices and/or for charging battery-powered devices entails the problem that, in the case of inductive energy transmission, part of the energy emitted is radiated into the surrounding space. Only part of the emitted energy is absorbed by the receiving end and converted back into electrical energy. The remaining part of the emitted energy is lost for energy transfer and causes undesirable effects in the environment of the wireless, inductive energy transmission device.
- the document EP 2 332 231 B1 describes an inductive charger which inductively supplies energy to one or more battery-powered devices, each device comprising a secondary coil which is designed in such a way that it encloses part of a magnetic field and in response thereto generates a current for Generates charging a battery of a device, the charger comprising two or more pairs of primary coils arranged in a circular pattern, the circular pattern being intended to surround the one or more secondary coils of the devices, and an AC power source arranged so is arranged to supply an alternating current to the pair of primary coils, the alternating current being then applied to the pair of primary coils to generate a rotating magnetic field between respective ones of the pair of primary coils.
- the aim of this invention is a universal inductive charger in which a single primary can supply several different secondaries with electrical energy and an improved magnetic coupling and thus improved efficiency
- Document EP 2 689512 B1 describes a method for determining the power loss in a system for inductive power transmission.
- the method includes a power transmitter to inductively transmit power to a power receiver via a transmit coil and a receive coil.
- the method comprises the following steps, after which the power transmitter receives a received power parameter transmitted by the power receiver in one step; further obtain time information transmitted from the power receiver for time alignment to enable the power transmitter to align the time of calculating a power loss during power transmission with the power receiver; and then the power loss accordingly to calculate the received time information and the received power parameter.
- the object of the invention is therefore to provide a method for reducing the EMC interference emissions while at the same time improving the transmission efficiency. According to the invention, this object is achieved by the subject matter of the independent patent claim. Advantageous developments of the invention result from the features of the dependent patent claims.
- the present invention of a method for operating a wireless energy transmission device with the characterizing part of claim 1 offers the advantage with the method according to the invention that in a first step a field strength in an air gap between the transmitting coil and the receiving coil is measured by the at least one measuring device using the measuring element and in a further step, the transmission coil control unit sets an operating point of the energy transmission, taking into account the field strength value measured with the measuring element, in such a way that an efficiency of the energy transmission device is maximized.
- the operating point here is the setting of the parameters that characterize the transmission, such as current and voltage in the transmission coil, but above all the frequency, waveform and, if necessary, the type of modulation.
- a reduction in the undesired EMC interference emission is associated with a maximized efficiency.
- the consumption of electrical energy is reduced without the operation of the device supplied with energy having to be restricted.
- the method according to the invention for operating a wireless energy transmission device with a direct connection of the measuring device to the transmission coil control unit offers the great advantage that the operating point of the energy transmission can be set immediately by other elements in the communication path, taking into account the field strength value measured with the measuring element.
- the method according to the invention for operating a wireless energy transmission device with a second measuring device and with a second measuring element advantageously offers the advantage that the field strength in the air gap between the transmission coils cannot only be measured by a single measuring element.
- the method according to the invention can advantageously also enable operation of a wireless transmission device in particularly EMC-sensitive environments with the aid of the second measuring device.
- the first measuring device communicates with the second measuring device in the method according to the invention for operating a wireless energy transmission device.
- This direct communication is advantageous in order to be able to detect measurement deviations.
- the measuring devices thus monitor one another, and this mutual monitoring offers the advantage that the method according to the invention also enables operation of a wireless transmission device in particularly EMC-sensitive environments.
- the first measuring device communicates with the second measuring device and an improved operating point with an improved degree of effectiveness can be set on the basis of the exchanged measurement results.
- the method according to the invention for operating a wireless energy transmission device with a second measuring device and with a second measuring element offers the advantage that the specifications of the radio regulation are monitored and complied with. Since the radio regulation is still uniform at a regional level or sometimes only at a national level, the method according to the invention offers the advantage of simple adaptation to the regulations that apply locally.
- the applicable specifications of the Frequency regulation selected by country or region selection can be produced in a standard variant and is adapted to the specifications of the radio regulation prevailing in the respective market through a selection made by the user. There is no need to laboriously produce and distribute country variants.
- the method according to the invention for operating a wireless energy transmission device with a second measuring device and with a second measuring element advantageously offers the advantage that not only the field strength in the air gap between the transmission coils can be measured. It is advantageous to record further emissions from the wireless energy transmission device at least with the second measuring device.
- These emissions can be caused, for example, by the supply lines to the coils or by the electronic power circuits, and are not detected solely by measuring the field in the air gap between the coils.
- the second measuring device can record further emissions from the electrical device, which includes the wireless energy transmission device.
- the second measuring device can thus advantageously also detect emissions from capacitive and/or inductive components such as electric drive motors and include them in the evaluation. In this way, it is achieved in an advantageous manner that the electrical device as a whole monitors and complies with the specifications of the radio regulation.
- This holistic monitoring offers the advantage that the method according to the invention also enables the secure operation of a wireless transmission device in particularly EMC-sensitive environments.
- the method according to the invention offers the great advantage that the first measuring device with the first measuring element and/or the second measuring device with the second measuring element detect changes in the field strength in the air gap between the coils, which are caused by interfering metallic objects.
- operating situations are recognized in which, on the one hand, unwanted metallic Objects of the efficiency is lowered and on the other hand there is a risk that these objects are heated in an impermissible way.
- FIG. 1 shows a wireless energy transmission device with a transmitting coil and a receiving coil
- FIG. 2 shows a wireless energy transmission device with a transmission coil, a reception coil and a measuring device with a measuring element
- FIG. 3 shows a wireless energy transmission device with a transmission coil, a reception coil and a second measuring device and with a second measuring element.
- Figure 1 shows a wireless energy transmission device 1 of the prior art with a transmitter coil 4 suitable for inductive energy transmission and a receiver coil 6. Furthermore, Figure 1 shows a transmitter coil control unit 5 and a receiver coil control unit 7. The transmitter coil 4 is connected to an energy source 13. The transmitting device of the wireless energy transmission device 1 is spaced apart by an air gap 10 from the receiving device of the wireless Energy transmission device 1 arranged. In addition to the transmission of energy, information is also transmitted between the transmitting coil 4 and the receiving coil 6 . This information transmission can either use the energy transmission of the coils 4, 6 directly at the energy transmission frequency (as so-called in-band data transmission) or via the coils 4, 6 at a different frequency (as so-called out-of-band data transmission). . Also others can
- the air gap 10 between the transmitting coil 4 and the receiving coil 6 results from the structural conditions of the devices. Since the transmitting coil 4 and the receiving coil 6 are usually each arranged within a device housing, a distance between the transmitting coil 4 and the receiving coil 6 results from the wall thickness of the housing walls, even if the devices are arranged without any further distance from one another So touch housing walls. If, on the other hand, the transmitter coil 4 is built into a table top, for example, there is a distance between the transmitter coil 4 and the receiver coil 6 that is determined by the thickness of the table top and the wall thickness of the housing wall of the receiving device.
- This distance is usually always called an air gap 10, even if it is as in the cases described by way of example, there is not only necessarily air in the so-called air gap 10, but also, for example, housing material or the wood of a tabletop.
- the consumer supplied with electrical energy by the reception coil 6 can be an electrical energy store or another consumer, for example an electric drive of a kitchen appliance or an electronic device.
- An unfavorably enlarged air gap 10 and/or an insufficient alignment of the receiving coil 6 with the transmitting coil 4 lead to a large increase in the losses, which leads to a strong increase in the undesired emissions.
- the air gap 10 can also be enlarged by objects between the receiving coil 6 and the transmitting coil 4, for example.
- FIG. 2 shows a wireless energy transmission device 1 like FIG. 1, supplemented by a first measuring element 8.
- This first measuring element 8 is independent of the transmitter coil 4, which is used to transmit electrical energy.
- This additional first measuring element 8 is connected to a first measuring device 9 .
- the measuring device 9 is part of the transmission coil control unit 5.
- the additional first measuring element 8 can be used in conjunction with the measuring device 9 to provide information about the physical properties of the energy transmission on the transmitting side. For example, an alternating field whose physical properties are known can be generated via a predefined measurement signal. If the first measuring element 8 now determines physical properties that deviate from this, this indicates, for example, electrically conductive foreign objects in the vicinity of the transmission coil 4 .
- the use of the transmission coil 4 with a powerful signal suitable for energy transmission would lead to undesirable heating of the electrically conductive foreign object due to the generation of eddy currents. Failure to detect this could result in injury or fire.
- the arrangements of inductive transmitter coils 4 are not readily recognizable, particularly in the case of concealed installation of transmitter coils 4 in tabletops or worktops. Switching on such covered transmission coils 4 without supervision involves the great risk that, for example, metal objects carelessly left lying around will be heated and cause injuries or even fires. In addition, such objects significantly interfere with the wireless transmission of electrical energy, so that the efficiency of the wireless energy transmission device is reduced. This leads to an increase in unwanted emissions and, as a rule, to the legally regulated limit values being exceeded.
- radio regulation covers the electromagnetic spectrum from 9 kHz to 275 GHz.
- radio regulation is carried out by the ITU (International Telecommunication Union).
- radio regulation is carried out by intergovernmental organizations such as the CEPT (Conference Europeenne des Administrations des Postes et des Telecommunications).
- CEPT Confference Europeenne des Administrations des Postes et des Telecommunications
- radio regulation is carried out and implemented in the Federal Republic of Germany, for example, by the BnetzA (Federal Network Agency) on behalf of the Federal Ministry of Economics.
- radio regulation covers the use of the available spectrum and the allocation of usage options to specific user groups. With that the prohibition of use for other user groups also applies.
- a wireless energy transmission device 1 which is supplemented by a first measuring element 8 with a first measuring device 9, can supply information about the field strength in the air gap 10 to the transmission coil control unit 5 by measuring the field strength in the air gap 10. On the basis of the measured field strength in the air gap 10, it is possible for the transmission coil control unit 5 to control the transmission coil 4 in such a way that the emission of electromagnetic fields is reduced in such a way that the efficiency of the wireless energy transmission device 1 is increased.
- the optimum efficiency of the wireless energy transmission device 1 corresponds to what is known as the operating point AP, which is specified in data sheets, for example.
- An operating point AP that is not permanently set has the advantage that it does not simply change in an uncontrolled manner due to external influences and other effects such as aging effects, but can be readjusted according to the respective specifications. In the configuration shown in Figure 2, this is particularly easy and efficient, since using the first measuring element 8 with the first measuring device 9 information about the physical state of the wireless Transmission device available. This information is used to readjust the operating point AP at any time.
- FIG. 3 shows a wireless energy transmission device 1 like FIGS. 1 and 2, which additionally includes a second measuring element 11 .
- the additional second measuring element 11 is used together with the second measuring device 12 to detect occurring electromagnetic alternating fields.
- the additional second measuring element 11, together with the second measuring device 12 detects the wireless
- the additional second measuring element 11 is used together with the second measuring device 12 to measure the alternating electromagnetic fields emitted by other electrical devices in addition to the wireless energy transmission device 1 such as, for example, by electric motors.
- Information about the radiation behavior is therefore not only available for the wireless energy transmission device 1, but also for the entire device.
- the information from the additional second measuring element 11 together with the second measuring device 12 is used to operate the entire device in accordance with the rules, since emissions of electromagnetic alternating fields that go beyond the regulated limit values are detected and countermeasures up to a complete shutdown of the wireless energy transmission device 1 and other electrical Components can be taken.
- the additional second measuring element 11 together with the second measuring device 12 also serves to detect increased emissions of alternating electromagnetic fields caused by malfunctions and to avoid operation that does not conform to the rules. This reliably prevents radio interference caused by exceeding legally regulated limit values and avoids penalties due to the operation of devices outside the permissible range.
- surprising changes can be determined by measuring the electromagnetic field of the wireless energy transmission device 1 .
- Such surprising changes in the electromagnetic field indicate metallic objects in the air gap 10 between the transmitting coil 4 and the receiving coil 6 .
- metallic object are generated by the electromagnetic field of energy transmission eddy currents, which lead to heating of the metallic object in the air gap 10 between the transmitting coil 4 and the receiving coil 6.
- heating can lead to injuries or fires and must therefore be avoided at all costs.
- the detection of the so-called foreign objects in the air gap 10 by the continuous measurement of the electromagnetic field leads to the energy transmission being switched off and thus to the elimination of the danger.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180095504.4A CN116982237A (zh) | 2021-01-11 | 2021-12-10 | 用于运行无线传输装置以识别和避免高频场的不希望的辐射的方法 |
EP21835710.1A EP4275263A1 (de) | 2021-01-11 | 2021-12-10 | Verfahren zum betrieb einer drahtlosen übertragungsvorrichtung zur erkennung und vermeidung unerwünschter abstrahlungen von hochfrequenten feldern |
JP2023541712A JP2024502181A (ja) | 2021-01-11 | 2021-12-10 | 高周波磁場の望ましくない放射を認識して回避するために無線伝送装置を動作させるための方法 |
US18/260,636 US20240055909A1 (en) | 2021-01-11 | 2021-12-10 | Method for operating a wireless transmission device for detecting and preventing undesired emissions of high-frequency fields |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021200177.7 | 2021-01-11 | ||
DE102021200177.7A DE102021200177A1 (de) | 2021-01-11 | 2021-01-11 | Verfahren zum Betrieb einer drahtlosen Übertragungsvorrichtung zur Erkennung und Vermeidung unerwünschter Abstrahlungen von hochfrequenten Feldern |
Publications (1)
Publication Number | Publication Date |
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WO2022148598A1 true WO2022148598A1 (de) | 2022-07-14 |
Family
ID=79185894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/085142 WO2022148598A1 (de) | 2021-01-11 | 2021-12-10 | Verfahren zum betrieb einer drahtlosen übertragungsvorrichtung zur erkennung und vermeidung unerwünschter abstrahlungen von hochfrequenten feldern |
Country Status (6)
Country | Link |
---|---|
US (1) | US20240055909A1 (de) |
EP (1) | EP4275263A1 (de) |
JP (1) | JP2024502181A (de) |
CN (1) | CN116982237A (de) |
DE (1) | DE102021200177A1 (de) |
WO (1) | WO2022148598A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100244839A1 (en) * | 2009-03-31 | 2010-09-30 | Fujitsu Limited | Power transmitting apparatus |
EP2332231B1 (de) | 2008-09-05 | 2015-12-23 | Koninklijke Philips N.V. | Induktives ladegerät und ladeverfahren |
EP2689512B1 (de) | 2011-03-21 | 2016-11-30 | Koninklijke Philips N.V. | Berechnung des leistungsverlustes für induktive leistungsübertragung |
US20180329101A1 (en) * | 2014-05-07 | 2018-11-15 | Witricity Corporation | Foreign object detection in wireless energy transfer systems |
CN109450057A (zh) * | 2019-01-11 | 2019-03-08 | 镇江博联电子科技有限公司 | 一种基于无线充电系统效率的无线充电方法 |
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2021
- 2021-01-11 DE DE102021200177.7A patent/DE102021200177A1/de active Pending
- 2021-12-10 WO PCT/EP2021/085142 patent/WO2022148598A1/de active Application Filing
- 2021-12-10 EP EP21835710.1A patent/EP4275263A1/de active Pending
- 2021-12-10 JP JP2023541712A patent/JP2024502181A/ja active Pending
- 2021-12-10 CN CN202180095504.4A patent/CN116982237A/zh active Pending
- 2021-12-10 US US18/260,636 patent/US20240055909A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2332231B1 (de) | 2008-09-05 | 2015-12-23 | Koninklijke Philips N.V. | Induktives ladegerät und ladeverfahren |
US20100244839A1 (en) * | 2009-03-31 | 2010-09-30 | Fujitsu Limited | Power transmitting apparatus |
EP2689512B1 (de) | 2011-03-21 | 2016-11-30 | Koninklijke Philips N.V. | Berechnung des leistungsverlustes für induktive leistungsübertragung |
US20180329101A1 (en) * | 2014-05-07 | 2018-11-15 | Witricity Corporation | Foreign object detection in wireless energy transfer systems |
CN109450057A (zh) * | 2019-01-11 | 2019-03-08 | 镇江博联电子科技有限公司 | 一种基于无线充电系统效率的无线充电方法 |
Also Published As
Publication number | Publication date |
---|---|
US20240055909A1 (en) | 2024-02-15 |
CN116982237A (zh) | 2023-10-31 |
EP4275263A1 (de) | 2023-11-15 |
JP2024502181A (ja) | 2024-01-17 |
DE102021200177A1 (de) | 2022-07-14 |
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