EP3797436A1 - Schaltgerät und verfahren - Google Patents
Schaltgerät und verfahrenInfo
- Publication number
- EP3797436A1 EP3797436A1 EP19746016.5A EP19746016A EP3797436A1 EP 3797436 A1 EP3797436 A1 EP 3797436A1 EP 19746016 A EP19746016 A EP 19746016A EP 3797436 A1 EP3797436 A1 EP 3797436A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching device
- electronic unit
- unit
- contacts
- mechanical unit
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000008901 benefit Effects 0.000 description 20
- 230000001681 protective effect Effects 0.000 description 5
- 238000011109 contamination Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/548—Electromechanical and static switch connected in series
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H2009/0292—Transparent window or opening, e.g. for allowing visual inspection of contact position or contact condition
Definitions
- the invention relates to a switching device for interrupting egg nes multiple conductors low-voltage circuit according to the preamble of claim 1 and a method for a switching device with a disconnect function according to the Oberbe handle of claim 19.
- Disconnectors or switch disconnectors are generally known.
- Disconnectors or disconnectors are electrical actuation systems that are designed for the load-free (de-energized) electrical disconnection of electrical low-voltage circuits or systems (parts). Electrical disconnection under load is not possible or only possible to a limited extent using conventional disconnectors and can lead to the destruction of the disconnector due to an arc that occurs during disconnection.
- Switch disconnectors or switch disconnectors are electrical actuation systems which are designed for the electrical separation of electrical low-voltage circuits or systems (parts) under load.
- load disconnectors have, for example, an arc extinguishing device, by means of which an arc which arises during electrical separation under load can be guided away from switching elements of the load disconnector and in a heat-resistant section of the arc extinguishing device, such as e.g. an arc quenching chamber, is quenchable. In this way, thermal overloading of sensitive components of the load disconnector caused by the arc is avoided.
- a special embodiment of disconnectors or switch disconnectors are fuse-operated switch disconnectors, such as fuse switch disconnectors or fuse switch disconnectors.
- Fuse switch disconnectors are load disconnectors that have an electrical fuse. sen, such as a fuse, for example a so-called NH fuse.
- Disconnectors or switch disconnectors are usually operated manually, for example by a handle, e.g. In the form of a toggle or lever, the contacts of the circuit open, so that a galvanic separation, in particular with a separation section or protective section, is realized.
- fuse disconnectors or fuse switch disconnectors Even with fuse disconnectors or fuse switch disconnectors, only a manual interruption is basically provided, the fuse only serves as additional protection for extreme situations. With fuse switch disconnectors, the fuse usually has to be changed before the low-voltage circuit or the system can be supplied with energy again.
- circuit breakers In contrast, circuit breakers, circuit breakers or residual current circuit breakers are known.
- the circuit is interrupted automatically or manually, usually automatically when certain overcurrent, short-circuit or fault current conditions exist. After an interruption, these devices can be switched on again relatively quickly. Manual deactivation is also possible.
- Miniature circuit breakers and circuit breakers refer to protective devices or circuit breakers that function in a similar way to a fuse. Miniature circuit breakers and circuit breakers monitor the current flowing through them by means of at least one conductor and interrupt the electrical current or energy flow to an energy sink or a consumer, which is referred to as tripping, if protection parameters, such as current limit values or current-time limit values, ie if a current value is present for a certain time period, are exceeded. The interruption takes place mechanically by opening contacts.
- protection parameters such as current limit values or current-time limit values, ie if a current value is present for a certain time period
- Residual current circuit breakers determine the total current in an electrical circuit, which is normally zero, and interrupt when a residual current value is exceeded, i.e. a non-zero current sum that exceeds a certain (differential) current value or fault current value, the electrical circuit. The interruption takes place here automatically.
- Low voltage means voltages up to 1000 volts AC and / or 1500 volts DC. Low voltage means in particular voltages that are greater than the low voltage, with values of 50 volts AC and 120 volts DC.
- the current values mentioned refer in particular to nominal and / or breaking currents, i.e. The maximum current that is normally conducted through the circuit or at which the electrical circuit is usually interrupted, for example by a switching device or a protective device or a protective switching device, such as a circuit breaker or circuit breaker.
- the invention relates to switching devices with a disconnect function.
- the separation function means a certain minimum distance or minimum air gap between the contacts of the switching device. This minimum air gap is essentially voltage-dependent. Other parameters are the pollution degree, the type of field (homogeneous, inhomogeneous), and the air pressure or the altitude above sea level.
- the object of the present invention is to improve a switching device with a disconnecting function of the type mentioned at the outset, in particular to improve switching or to increase the number of possible switching operations or to increase the service life.
- switching device for a multiple conductor on a low-voltage circuit, - with a housing, with connection contacts arranged on the housing for connecting conductors of the low-voltage circuit,
- an electronic unit is provided which is connected in series to the mechanical unit on the current flow side,
- auxiliary switch and the electronic unit are designed in such a way
- high-impedance is meant a state in which only a current of negligible size flows.
- high-resistance values of greater than 1 kiloohm, better than 10 kiloohm, 100 kiloohm, 1 megohm, 10 megohm,
- the separation function is:
- the isolating function is characterized by a minimum air gap of the opened isolating contacts in the OFF position (open position, opened contacts) depending on the rated impulse withstand voltage and the degree of contamination.
- the minimum air gap is in particular between 0.01 mm and 14 mm.
- the isolating function is characterized by a minimum air gap of the opened isolating contacts in the OFF position as a function of the measurement surge voltage resistance and the degree of contamination.
- the minimum air gap is between 0.01 mm at 0.33 kV and 14 mm at 12 kV, in particular for pollution degree 1 and in particular for inhomogeneous fields.
- the minimum air distance can have the following values: E DIN EN 60947-1 (VDE 0660-100): 2018-06
- the pollution levels and field types correspond to those defined in the standards.
- the mechanical unit has an operating lever or a manual, motorized, pneumatic or spring-loaded switching mechanism for actuating the isolating contacts to achieve the open or closed position (open or closed contacts).
- the electronic unit (E) has a high resistance.
- the mechanical unit is a mechanical unit of a switch disconnector.
- the switching device is in particular a disconnector or switch disconnector.
- the mechanical unit i.e. to the ON position, after closing the contacts the electronic unit has a low resistance.
- low-resistance values mean resistance values that are less than 10 ohms, better less than 1 ohms, 100 milli-ohms, 10 milli-ohms, 1 milli-ohms, 100 micro-ohms, 10 micro-ohms, 1 micro-ohms, 100 nano-ohms, 10 nano-ohms, 1 nano-ohm or less.
- the electronic unit is designed with semiconductors, in particular is a semiconductor switch, for example with bipolar transistors, field effect transistors, thyristors and / or isolated gate bipolar transistors (IGBT).
- semiconductors in particular is a semiconductor switch, for example with bipolar transistors, field effect transistors, thyristors and / or isolated gate bipolar transistors (IGBT).
- IGBT isolated gate bipolar transistors
- the electronic unit is high-resistance with an opened mechanical unit.
- the auxiliary switch is mechanically connected to the mechanical unit. Before the (mechanical) contacts open, an electrical contact of the auxiliary switch opens, so that an auxiliary electrical circuit connected to the electronic unit (and having the auxiliary switch) is opened, so that the electronic unit then reduces the electrical current of the conductors of the low-voltage circuit, in particular ideally interrupts. For example, by making it high-impedance. Alternatively, this can be done inversely by opening the auxiliary switch or generally by changing the contact, in particular also by a wiping contact.
- the electronic unit is high-resistance when the contacts of the mechanical unit are open. After the contacts have been closed, the electrical contact of the auxiliary switch is closed, so that the electrical auxiliary circuit is closed, so that the electronic unit then becomes low-resistance, in particular ideally superconducting.
- a switch which is connected to the electronic unit. Both are designed in such a way that the switch can be used to switch between the high-resistance and low-resistance state of the electronic unit;
- the auxiliary switch has a sensor. This has the particular advantage that there is a simple implementation for an auxiliary switch.
- the auxiliary switch is designed as a module that can be coupled to the mechanical unit.
- the switching device is designed in such a way that, when the low-voltage circuit is in the de-energized state, the mechanical unit can always be moved to the OFF position by the
- the switching device is designed in such a way that when the low-voltage circuit is de-energized and when the mechanical unit is in the OFF position when the power unit is switched to, the electronic unit remains high-resistance.
- the electronic unit is designed such that when a current limit value of the low-voltage circuit is exceeded, the electronic unit changes to the high-resistance state. This has the particular advantage that both the electronic unit and the low-voltage circuit are protected.
- the electronic unit is coupled to the mechanical unit in such a way that when the current limit value is exceeded and the electronic unit changes to the high-resistance state, the mechanical unit is brought into the OFF position in order to achieve the isolating function.
- the drawing shows a figure.
- the figure shows a schematic diagram of a novel switching device.
- the figure shows a switching device SG according to the invention for a low-voltage circuit having several conductors LI, 12, L3.
- the switching device SG has a housing GEH with terminals AK1, ..., AK6 for the conductors LI, L2, L3 of the low-voltage circuit.
- the connection terminals are attached to the housing.
- the example shows a three-phase AC circuit with a first conductor LI, a second conductor L2 and a third conductor L3.
- a single-phase AC circuit with two conductors e.g. External and neutral conductors, or a three-phase AC circuit with one
- Be neutral i.e. with 4 conductors.
- the conductors LI, L2, L3 are connected on the input side, in particular on the energy source side, to an, in particular particularly exclusively, manually operated mechanical unit M which has contacts K1, K2, K3 for interrupting the conductors LI, L2, L3 ,
- the contacts K1, K2, K3 can be opened and closed by an operating lever H, such as a manually operated handle, for example in the form of a toggle or lever, so that an opening and
- a manual, motorized, pneumatic or spring-loaded switching mechanism can be provided to actuate the isolating contacts (Kl, K2, K3) to achieve the off or on position or to support it.
- the conductors LI, L2, L3 are connected on the other hand, in particular on the energy sink side or on the consumer side, to an electronic unit E.
- the switching device can be connected to energy sinks or energy sources but also the other way round (energy source to electronic unit, energy sink to mechanical unit).
- the mechanical unit M is in turn connected to the electronic unit E, in particular the conductors LI, L2, L3 establish a connection. Electrically, there is a series connection of the mechanical unit and the electrical unit, which is implemented by means of the conductors.
- an auxiliary switch A connected to the mechanical unit M is also provided, which in turn is connected to the electronic unit E, in particular
- auxiliary circuit is electrically connected, for example by an auxiliary circuit.
- the auxiliary switch A and the electronic unit E are designed such that when the mechanical unit M is opened before the contacts K are opened, during the opening of the contacts or after the contacts have opened, in particular shortly after the contacts have been opened, ie the isolating contacts are no longer in contact with each other, the electronic unit E becomes high-resistance. This means that the
- the electronic unit (E) only becomes low-resistance after the contacts of the mechanical unit have been closed. Thus, it is switched on virtually without current or without load.
- the electronic unit can be designed with semiconductors, in particular a semiconductor switch.
- the electronic unit E can have a high resistance, so that a safe basic state is given, in particular when the mechanical unit is open.
- the electronic unit E can contain a further overcurrent protection (or short-circuit protection) so that when a current limit value is exceeded or a current time period limit value is exceeded, ie a current value is present for a certain period of time, an interruption (reduction of the electrical current) or high impedance) of the circuit by the electronic unit E.
- the invention can be designed in such a way that the auxiliary switch A is mechanically connected to the mechanical unit M that, before the contacts K open, an electrical contact of the auxiliary switch A opens, so that one connected to the electronic unit E and having the auxiliary switch electrical auxiliary circuit is opened, so that the electronic unit E then reduces the electrical current of the conductors LI, L2, L3 of the low-voltage circuit, in particular ideally interrupts.
- the electronic unit E can have a high resistance when the contacts K of the mechanical unit. After the contacts K of the mechanical unit M have been closed, the electrical contact of the auxiliary switch A is closed, so that the auxiliary electrical circuit is closed, so that the electronic unit E then becomes low-resistance. In particular, it can ideally become superconducting or almost superconducting.
- a switch S can be provided which is connected to the electronic unit E. Both are designed such that the switch can be used to switch between the high-resistance and low-resistance state of the electronic unit E. In particular, only when the mechanical unit M is closed. A switching function can thus be easily implemented, regardless of the isolating function.
- the conductors LI, L2, L3 of the low-voltage circuit are electrically interrupted, with the opening process before, during or after, in particular the shortly after the galvanic interruption of the conductors LI, L2, L3, the current of the conductors LI, L2, L3 of the low voltage circuit is reduced, in particular ideally a current interruption.
- an electronic unit connected in series For example, by an electronic unit connected in series.
- the auxiliary switch can advantageously be designed as a module.
- a further connection from the electronic unit to the mechanical unit can be provided in order to ensure a high impedance of the electronic unit as well as a triggering or OFF position or OFF state of the mechanical unit when a, in particular adjustable, current limit value is exceeded to achieve.
- a very powerful switching device is available, in particular with an isolating function in accordance with the standard.
- the invention can also be used very advantageously for switch disconnectors, protective switching devices or circuit breakers.
- the new electronic switching device e.g. in the form of a circuit breaker or hybrid switchgear similar to a circuit breaker, but with an isolating function, is carried out with an electronically safe unit or switching electronics E, a mechanical unit or isolating mechanism M and auxiliary switch A.
- the function of the switchgear with isolating function and a minimum switching category AC / DC xl (AC xO - de-energized switching, from AC xl - energized switching; x - stands for a number that defines the device category; according to series 60947), has an auxiliary switch A, for electrical locking gelation is used.
- the electrical locking acts on the electronic unit E or electronics, which reduces or (quasi) interrupts the current flow before opening the mechanical contacts K. In the open position of the mechanical unit or OFF position, the electrical disconnection function is fulfilled by the disconnection mechanism / contacts K.
- a user switches the separating mechanism from the closed or ON state / position towards the OFF state / position.
- the leading auxiliary switch A triggers the electronic unit E or switching electronics, which reduces or (quasi) interrupts the current.
- This new electronic switching device or switch disconnector is therefore switched mechanically and triggers electronics in the background to cause a power interruption. After opening the contacts, the disconnection function is given.
- the electronic unit E is controlled by the mechanical unit M (e.g. today's switch disconnector). This is done e.g. in the course of an electrical lock.
- the mechanical unit M e.g. today's switch disconnector
- the control takes place here by a mechanically / electrically coupled signal, by rotation e.g. the handle H of the mechanical unit M to the electronic unit (switch ON or OFF). It is not controlled by an evaluation unit, as with a circuit breaker.
- the operating lever or the handle can be closed or locked in an open state of the contacts, that is to say in the off state, for example by a lock.
- a switch S can be provided which allows the electronic unit to become high-resistance / interruption of the electrical circuit, in particular in the ON position of the mechanical unit. No separation function is achieved here.
- the separation function is basically formed by the mechanical unit M. In particular, at least air or creepage distances are achieved. Furthermore, a one-to-one switch position indicator for the isolating function is guaranteed by the handle.
- the electronic unit is never live when the contacts of the mechanical unit are open, i.e. an OFF state is displayed.
- the new electronic switching device in particular the new switch disconnector, is formed from an electronic unit E and a mechanical unit M, in particular their series connection.
- the mechanical unit M is coupled to an auxiliary switch A which controls the electronic unit E, as a result of which an electrical locking is achieved.
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
- Keying Circuit Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018213354.9A DE102018213354A1 (de) | 2018-08-08 | 2018-08-08 | Schaltgerät und Verfahren |
PCT/EP2019/068876 WO2020030379A1 (de) | 2018-08-08 | 2019-07-12 | Schaltgerät und verfahren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3797436A1 true EP3797436A1 (de) | 2021-03-31 |
EP3797436B1 EP3797436B1 (de) | 2022-06-01 |
Family
ID=67480174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19746016.5A Active EP3797436B1 (de) | 2018-08-08 | 2019-07-12 | Schaltgerät und verfahren |
Country Status (5)
Country | Link |
---|---|
US (1) | US11538642B2 (de) |
EP (1) | EP3797436B1 (de) |
CN (1) | CN112543986B (de) |
DE (1) | DE102018213354A1 (de) |
WO (1) | WO2020030379A1 (de) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020216409B4 (de) * | 2020-12-21 | 2022-08-25 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102021210820A1 (de) | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät |
DE102021210814A1 (de) | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät |
DE102021210815A1 (de) | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät |
DE102021210812A1 (de) | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102021210829A1 (de) * | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät |
DE102021210833A1 (de) * | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102021210821A1 (de) | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät |
DE102021210810A1 (de) * | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102021210834A1 (de) * | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102021210831A1 (de) * | 2021-09-28 | 2023-03-30 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022209032A1 (de) | 2022-08-31 | 2024-02-29 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022209035A1 (de) | 2022-08-31 | 2024-02-29 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022209024A1 (de) | 2022-08-31 | 2024-02-29 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022209026A1 (de) | 2022-08-31 | 2024-02-29 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022209018A1 (de) | 2022-08-31 | 2024-02-29 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022210358A1 (de) * | 2022-09-29 | 2024-04-04 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022211677A1 (de) * | 2022-11-04 | 2024-05-08 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
DE102022211676A1 (de) | 2022-11-04 | 2024-05-08 | Siemens Aktiengesellschaft | Schutzschaltgerät und Verfahren |
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DE19944043A1 (de) * | 1999-09-14 | 2001-03-15 | Siemens Ag | Fehlerstrom-Schutzeinrichtung und Verfahren zum Betreiben einer Fehlerstrom-Schutzeinrichtung |
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WO2014117813A1 (de) * | 2013-01-29 | 2014-08-07 | Siemens Aktiengesellschaft | Vorrichtung zum schalten von gleichströmen in abzweigen eines gleichspannungsnetzknotens |
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-
2018
- 2018-08-08 DE DE102018213354.9A patent/DE102018213354A1/de active Pending
-
2019
- 2019-07-12 US US17/261,964 patent/US11538642B2/en active Active
- 2019-07-12 EP EP19746016.5A patent/EP3797436B1/de active Active
- 2019-07-12 CN CN201980052389.5A patent/CN112543986B/zh active Active
- 2019-07-12 WO PCT/EP2019/068876 patent/WO2020030379A1/de active Search and Examination
Also Published As
Publication number | Publication date |
---|---|
CN112543986B (zh) | 2024-08-23 |
EP3797436B1 (de) | 2022-06-01 |
US20210296059A1 (en) | 2021-09-23 |
WO2020030379A1 (de) | 2020-02-13 |
US11538642B2 (en) | 2022-12-27 |
CN112543986A (zh) | 2021-03-23 |
DE102018213354A1 (de) | 2020-02-13 |
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