EP3804109A1 - Élément filtrant électrique et convertisseur de courant électrique - Google Patents

Élément filtrant électrique et convertisseur de courant électrique

Info

Publication number
EP3804109A1
EP3804109A1 EP19724180.5A EP19724180A EP3804109A1 EP 3804109 A1 EP3804109 A1 EP 3804109A1 EP 19724180 A EP19724180 A EP 19724180A EP 3804109 A1 EP3804109 A1 EP 3804109A1
Authority
EP
European Patent Office
Prior art keywords
filter element
circuit board
electrical
magnetic core
printed circuit
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19724180.5A
Other languages
German (de)
English (en)
Inventor
Wolfram Kienle
Konstantin Spanos
Heiner Jacobs
Dennis BURGER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3804109A1 publication Critical patent/EP3804109A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2895—Windings disposed upon ring cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0237—High frequency adaptations
    • H05K1/0243—Printed circuits associated with mounted high frequency components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H01F2027/2814—Printed windings with only part of the coil or of the winding in the printed circuit board, e.g. the remaining coil or winding sections can be made of wires or sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/0035—Wound magnetic core
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/0057—Constructional details comprising magnetic material
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0092—Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10015—Non-printed capacitor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/1003—Non-printed inductor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/1006—Non-printed filter

Definitions

  • the present invention relates to an electric filter element and an electric power converter with such an electric filter element.
  • Electric power converters in particular inverters
  • inverters are used in numerous technical fields.
  • such inverters are used in electric drive systems of electric or hybrid vehicles.
  • the inverters used in this case in particular clocked inverters, such as pulse-controlled inverters (PWR), naturally generate electrical common-mode and differential mode interference.
  • PWR pulse-controlled inverters
  • filter devices which can control the emission of disturbances in the direction of a supply network, such as the
  • Example the high-voltage network of an electric vehicle, reduce. There are already numerous directives and regulations which specify a maximum permissible emission of disturbances.
  • Document DE 10 2010 054 005 A1 discloses an electrical device with an inverter and an EMC filter.
  • the EMC filter includes
  • Noise suppression capacitors and a common mode rejection choke with a magnetically active core are connected to power supply terminals through the common mode rejection reactor and to a ground terminal via the suppression capacitors.
  • Disclosure of the invention discloses an electric filter element having the features of claim 1 and an electric power converter arrangement having the features of claim 10.
  • Printed circuit board substrate a second dielectric board substrate, an annular magnetic core, and a first number of inner ones
  • the annular magnetic core is disposed between the first printed circuit substrate and the second printed circuit substrate.
  • the inner electrical connection elements are arranged in an inner region of the annular magnetic core.
  • Each inner electrical connection element is in this case designed, in particular, to have an electrical connection point on the first printed circuit board substrate with a corresponding electrical connection point on the second
  • the present invention is based on the finding that electric power converters, such as pulse inverters, of course, can cause electrical common mode and differential mode noise. To reduce these disturbances, specially adapted filter devices are usually required. Conventionally designed filter devices require a high conceptual effort. The filter devices for minimizing the common-mode and push-pull interference therefore lead to a high cost and are usually associated with a significant need for space.
  • the present invention provides an inductive component, which allows due to its special construction with a small space volume filtering of AC voltage components. Due to the dielectric circuit boards used, the special structural design of the filter element makes it possible to provide a very good base for connection elements in order to electrically connect the filter element at the input and output to further modules. In addition, by the special arrangement of the magnetic core between the two circuit boards, a current waveform can be realized, which is an inductive
  • the inductance of the filter element can be adjusted.
  • the filter properties of the device for filtering AC voltage components are increased.
  • a high inductance can be realized in a small space, resulting in efficient filtering of
  • circuit board substrates used provide a
  • additional components can be mounted on the circuit boards. These additional components can also be used to filter interference.
  • the additional components on the individual circuit boards, as well as the magnetic core and the wiring between the individual circuit boards can be adapted to the respective needs. In this way, depending on the application, an optimal adaptation of the filter properties can always be realized.
  • Each of the first and second dielectric board substrates may be any printed circuit board substrate.
  • conventional printed circuit board substrates can be used, as used for example in the field of printed circuits application.
  • the basis for such dielectric circuit board substrates form for example carrier substrates made of an electrically non-conductive material, such as epoxy or the like.
  • further electrically conductive structures are to be mounted on the dielectric circuit board substrates, these can be realized, for example, from electrically conductive copper, silver or another electrically conductive material.
  • the electrically conductive structures for example, the individual connecting elements of the electric filter element in a suitable
  • Printed circuit board substrates can either be mounted on the sides facing away from the magnetic core or on the sides of the printed circuit board substrate that face the magnetic core. It is also possible in principle to apply electrically conductive structures both on the sides facing the magnetic core and on the sides of the printed circuit board substrates facing away from the magnetic core.
  • the annular magnetic core may be any magnetic core.
  • the magnetic core has a material-free interior area.
  • the annular magnetic core may be in the form of, for example, a hollow cylinder, a toroid, or the like.
  • the magnetic core does not necessarily have to have a circular outer geometry. Also, for example, rectangular or square cross-sections with a material-free interior are possible as a magnetic core.
  • the magnetic core may also have any other structure which has a material-free inner region.
  • the electrical connection elements can be any electrically conductive elements which are designed to provide an electrically conductive connection between the two dielectric circuit board substrates.
  • the inner electrical connection elements are arranged in the material-free inner region of the magnetic core.
  • the electrical connection elements may be electrically conductive rods, for example rod-shaped elements made of an electrically conductive metal. It is understood that a single electrically conductive connecting element also from several individual, parallel arranged connecting elements may exist, for example, to increase the current carrying capacity.
  • the connection elements can be soldered, welded or otherwise electrically connected to the connection points on the printed circuit board substrates, for example. For example, contacting by means of a pressing method or the like are possible.
  • Printed circuit board substrate realized by the inner region of a magnetic core to a second dielectric circuit substrate. In this way, an inductive component can be created, which allows the advantages described above.
  • the electrical filter element comprises a second number of external electrical connection elements.
  • the outer electrical connection elements are arranged in an outer region of the annular magnetic core.
  • Each external electrical connection element is designed to each have a connection point on the first
  • the first printed circuit substrate may have a first electrically conductive structure
  • the second printed circuit substrate may have a second electrically conductive structure.
  • the first electrically conductive structure can each one
  • the second electrically conductive structure can be designed in each case one connection point of an outer electrical connection element with a corresponding one
  • an electrical conduction structure may be provided on the magnetic core corresponding to a plurality of turns around the magnetic core, respectively.
  • the electrical current in the inner region of the magnetic core can flow in each case in a first direction, and in the outer region in a second, opposite direction.
  • an electrical filter element be created, each having a plurality of turns for the inductance of the filter element.
  • the electrical filter element includes a first capacitor disposed on the first dielectric circuit substrate.
  • the first capacitor may be electrically coupled at a first terminal to a first inner connector and electrically coupled at a second terminal to a second inner connector. In this way, a capacitance can be provided between two inner electrical connection elements of the filter element. This capacity can also be used to filter
  • AC interference can be used.
  • a further capacitor on the second dielectric circuit board substrate, which is likewise arranged between two inner connecting elements.
  • Such capacitors are also referred to as X capacitors.
  • the electrical filter element comprises a second capacitor and a third capacitor.
  • the second capacitor may be disposed on the first dielectric circuit substrate, and electrically coupled at a first terminal to a first inner connector, and electrically coupled to a second terminal with a reference potential.
  • the third capacitor may also be disposed on the first dielectric circuit substrate.
  • Capacitor may be electrically coupled to a first terminal having a second inner connection element and a second terminal being electrically coupled to a reference potential. In this way, capacitors, so-called Y capacitors, can be provided between individual inner connecting elements and a reference potential. These also allow filtering of AC interference.
  • Printed circuit board substrate the individual circuit board substrates can be customized according to the particular application. This allows a flexible and modular design of filter elements for each
  • the first printed circuit board substrate comprises a first connection device with a plurality of connection elements.
  • Connection device can be designed with an electric
  • each one can
  • Connection element of the connection device with an inner
  • Connecting element to be electrically coupled.
  • the connector element to be electrically coupled.
  • Connection device comprise two connection elements which can be electrically connected to the respective connection elements of a DC voltage source.
  • the magnetic core filled with a dielectric filling material.
  • the filling material may be, for example, a dielectric casting compound, such as a synthetic resin or the like. act.
  • Filter element can be increased.
  • the dielectric can be increased.
  • Filter material for example, an improved cooling of the filter element serve.
  • the magnetic core has a closed annular structure.
  • the magnetic core can be designed as a toroidal or hollow-cylindrical component.
  • the magnetic core can be realized from a single piece of material.
  • the magnetic core has at least one air gap. Additionally or alternatively, the magnetic core may also comprise separate ferromagnetic particles. Such a core with separate ferromagnetic particles is also referred to as a core with a so-called distributed air gap. By discrete or distributed Air gaps, the inductive properties of the electrical filter element can be adjusted accordingly.
  • the electrical filter element comprises a cooling device.
  • the cooling device may be thermally coupled to the magnetic core.
  • the cooling device may be designed to apply the magnetic core and / or the inner and outer connecting elements and / or the further components to the dielectric
  • the cooling device can be either an active or alternatively also a passive cooling device.
  • air- or liquid-cooled cooling devices are possible.
  • FIG. 1 shows a cross section through an electrical filter element according to a
  • FIG. 2 shows a cross section through an electrical filter element according to a further embodiment
  • FIG. 3 is a plan view of the electric filter element according to a
  • FIG. 4 shows a plan view of an electrical filter element according to a further embodiment
  • FIG. 5 shows a schematic representation of a block diagram of a
  • Fig. 1 shows a cross section through an electrical filter element 1 according to one embodiment.
  • the filter element 1 comprises a first dielectric
  • the dielectric board substrates 11, 12 may be any printed circuit board substrate, as used for example for printed circuits or the like. For example, that can
  • the filter element 1 comprises a number of one or more inner connecting elements 21, 22.
  • the filter element 1 comprises a plurality of inner connecting elements 21, 22.
  • the filter element 1 can have an even number of inner connecting elements 21, 22. In this way, a positive number and a negative polarity can each be assigned an equal number of inner connecting elements 21, 22.
  • the inner portion 13a of the magnetic core 13 may be filled with a dielectric filling material (not shown).
  • the inner portion 13a of the magnetic core 13 may be filled with a dielectric molding compound such as a synthetic resin or the like. In this way, the arrangement can be mechanically stabilized, for example.
  • a heat dissipation, in particular of the inner connecting elements 21, 22, can be increased by the dielectric filling material.
  • Fig. 2 shows a schematic representation of a cross section through an electrical filter element 1 according to another embodiment.
  • the statements made previously in connection with FIG. 1 also apply.
  • the filter element 1 according to FIG. 2 comprises in addition to the inner
  • Dielectric printed circuit substrate 12 are electrically connected to a corresponding outer connection element 31, 32. This can be
  • each outer electrical connection element 31, 32 can be electrically connected to a respective further corresponding inner connection element 23, 24 by means of a suitable electrical conductor structure on the first dielectric circuit substrate 11.
  • Printed circuit substrate 11, 12 and the outer connecting elements 31, 32 can be done in any way. For example, this can be done using
  • Soldered connection to be realized by means of welded connection or by means of press connection or the like.
  • Connecting elements can be realized.
  • a can also be realized.
  • the filter element 1 comprises a
  • Connection device 40 with a first connection element 41 and a second connection element 42 can be connected to the connection elements 41 and 42 of the positive and negative terminal of a DC voltage source.
  • connection elements 41 and 42 of the positive and negative terminal of a DC voltage source can be connected to the connection elements 41 and 42 of the positive and negative terminal of a DC voltage source.
  • a range G can be
  • connection element 41 of the connection device 40 is electrically coupled to an inner connection element 21.
  • second connection element 42 of the connection device 40 is electrically coupled to a further inner connection element 22.
  • first inner connecting element 21 is provided with a first outer one
  • Connecting element 31 is electrically connected.
  • the second inner connecting element 22 is electrically connected to a second outer connecting element 32.
  • the first outer connection member 31 is electrically connected to a third inner connection member 23 and the second outer one
  • Connecting element 32 is electrically connected on the first dielectric board substrate 11 to the fourth inner connecting element 24.
  • FIG. 4 shows a schematic representation of a top view of the filter element 1 according to a further embodiment. For those shown in Fig. 4
  • Embodiment also apply the previously made in connection with FIG. 3 embodiments.
  • a first filter capacitor 51 may be arranged between a positive terminal 41 and a negative terminal 42 of the filter element 1.
  • Such a capacitor is referred to, for example, as an X-capacitor.
  • X-capacitor Furthermore, for example, between the positive
  • a second or third filter capacitor 52, 53 may be arranged.
  • Such capacitors are for example also referred to as Y capacitors.
  • Capacitors, resistors or the like on the first printed circuit board substrate 11 possible.
  • identical or similar components for a symmetrical construction can be provided on the first printed circuit board substrate 11 and on the second printed circuit substrate 12, respectively.
  • a filter element 1 according to the invention can be produced by the simple combination of a first dielectric printed circuit board substrate 11 with already previously attached components, a second dielectric
  • FIG. 5 shows a schematic representation of a block diagram of an electric power converter 2 with an electrical filter element 1, as has already been explained in the previously described embodiments.
  • Filter element 1 can, for example, with terminals on the first dielectric circuit board substrate 11 with an electrical
  • Printed circuit board substrate 12 with the input of an electric power converter 2 For example, an inverter or a DC-DC converter are electrically connected.
  • Filter element 1 are cooled by means of an active or passive cooling device. In this case, a thermal coupling of the
  • the present invention relates to an electrical
  • the electrical filter element for filtering AC interference.
  • the electrical filter element comprises two dielectric circuit board substrates with a magnetic core arranged between the circuit board substrates.
  • the magnetic core has a material-free inner region, in which electrical connecting elements between the two dielectric
  • Printed circuit board substrates are provided. Furthermore, electrical connection elements between the two dielectric circuit board substrates may also be provided in an outer region of the magnetic core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Conversion In General (AREA)
  • Filters And Equalizers (AREA)

Abstract

L'invention concerne un élément filtrant électrique (1) destiné à filtrer des interférences de tension alternatives. L'élément filtrant électrique (1) comprend deux substrats de carte de circuit diélectrique (11, 12) comprenant un noyau magnétique (13) disposé entre les substrats de carte de circuit. Le noyau magnétique (13) comporte une région intérieure (13a), exempte de matière, dans laquelle des éléments de connexion électriques (21-24) sont prévus entre les deux substrats de carte de circuit diélectrique (11, 12). En outre, des éléments de connexion électriques (31, 32) peuvent également être prévus dans une région extérieure du noyau magnétique (13) entre les deux substrats de carte de circuit diélectrique (11, 12).
EP19724180.5A 2018-05-25 2019-05-13 Élément filtrant électrique et convertisseur de courant électrique Withdrawn EP3804109A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018208313.4A DE102018208313A1 (de) 2018-05-25 2018-05-25 Elektrisches Filterelement und elektrischer Stromrichter
PCT/EP2019/062156 WO2019224029A1 (fr) 2018-05-25 2019-05-13 Élément filtrant électrique et convertisseur de courant électrique

Publications (1)

Publication Number Publication Date
EP3804109A1 true EP3804109A1 (fr) 2021-04-14

Family

ID=66542263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19724180.5A Withdrawn EP3804109A1 (fr) 2018-05-25 2019-05-13 Élément filtrant électrique et convertisseur de courant électrique

Country Status (5)

Country Link
US (1) US11528005B2 (fr)
EP (1) EP3804109A1 (fr)
CN (1) CN112219345A (fr)
DE (1) DE102018208313A1 (fr)
WO (1) WO2019224029A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7982572B2 (en) * 2008-07-17 2011-07-19 Pulse Engineering, Inc. Substrate inductive devices and methods
DE102010054005A1 (de) 2010-12-09 2012-06-14 Schneider Electric Motion Deutschland Gmbh Elektrisches Gerät mit einem Wechselrichter und einem EMV Filter
US20130207763A1 (en) * 2011-06-24 2013-08-15 General Electric Company Cooling device for electrical device and method of cooling an electrical device
JP6369536B2 (ja) 2014-03-28 2018-08-08 株式会社村田製作所 コイルモジュール
CN107069730A (zh) * 2017-03-17 2017-08-18 珠海博翔科技有限公司 大电流无磁芯emc滤波器
DE102017120924A1 (de) * 2017-09-11 2019-03-14 Hanon Systems EMV-Filter zur Unterdrückung von Störsignalen

Also Published As

Publication number Publication date
US11528005B2 (en) 2022-12-13
CN112219345A (zh) 2021-01-12
DE102018208313A1 (de) 2019-11-28
US20210203299A1 (en) 2021-07-01
WO2019224029A1 (fr) 2019-11-28

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