EP3766171A1 - Filter unit and frequency inverter - Google Patents
Filter unit and frequency inverterInfo
- Publication number
- EP3766171A1 EP3766171A1 EP19711900.1A EP19711900A EP3766171A1 EP 3766171 A1 EP3766171 A1 EP 3766171A1 EP 19711900 A EP19711900 A EP 19711900A EP 3766171 A1 EP3766171 A1 EP 3766171A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- unit
- intermediate circuit
- filter unit
- inverter
- potential
- 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.)
- Pending
Links
Classifications
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/09—Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/11—Buck converter, i.e. DC-DC step down converter decreasing the voltage between the supply and the inverter driving the motor
Definitions
- the invention relates to a filter unit and a frequency converter with such a filter unit.
- du / dt filters which are connected between the output of the inverter and the electric motor.
- the invention has for its object to provide a filter unit, for example in the form of a du / dt filter, and a frequency converter available compared to filter units of the prior art lower losses, and / or a smaller volume, and / or have lower weight.
- the invention achieves this object by a filter unit according to claim 1 and a frequency converter according to claim 10.
- the filter unit according to the invention is intended to be switched or looped in between a, in particular conventional, inverter and an electric motor.
- the filter unit has a number of phase terminals for connection to corresponding phase terminals of the inverter.
- the filter unit may, for example, have exactly three phase connections.
- the filter unit further has a first intermediate circuit connection for connecting to a first intermediate circuit connection of the inverter.
- the inverter can output, for example, a positive DC link potential at the first DC link connection.
- the filter unit further has a second intermediate circuit connection for connection to a second intermediate circuit connection of the inverter.
- the inverter can output, for example, a negative DC link potential at the second DC link connection.
- a potential difference between positive and negative DC link potential can represent, for example, an intermediate circuit voltage.
- the filter unit further comprises a number of motor terminals for connection to corresponding terminals of the electric motor.
- the filter unit may have exactly three motor terminals for electrical connection to associated phase terminals of the electric motor.
- the filter unit further comprises a number of filter elements.
- the filter unit may, for example, have exactly three filter elements.
- the filter elements may, for example, be inductively acting components in the form of throttles.
- a respective filter element is looped between corresponding phase terminals of the filter unit and corresponding motor terminals of the filter unit. For example, a first filter element is looped between a first phase connection and a first motor connection, a second filter element is looped between a second phase connection and a second motor connection, and a third filter element is looped between a third phase connection and a third motor connection.
- the filter unit further has a coupling unit, which capacitively couples the filter elements to the first intermediate circuit connection and the second intermediate circuit connection of the filter unit.
- the filter elements in conjunction with the capacitive coupling unit reduce a rate of voltage rise at the motor terminals of the filter unit.
- the coupling unit has a number of capacitors.
- the coupling unit may for example have six capacitors.
- capacities of the cable connection can add significant extra capacity and thus further reduce the rate of voltage rise. This can influence the dimensioning of the number of capacitors. With sufficient capacity of the cable connection, the number of capacitors may possibly be completely eliminated.
- a first capacitor may be connected between a first motor terminal and the first intermediate circuit terminal
- a second capacitor may be connected between a second motor terminal and the first intermediate circuit terminal
- a third capacitor may be connected between a third motor terminal and the first
- a fourth capacitor may be looped between the first motor terminal and the second intermediate circuit terminal, a fifth capacitor may be connected between the second motor terminal and the second
- Be looped DC link and a sixth capacitor can be looped between the sixth motor terminal and the second DC link
- the capacitors are ceramic capacitors.
- the coupling unit has a voltage clamping unit which limits a difference between a respective potential at the motor terminals and a potential at the first intermediate circuit terminal to a predetermined first potential difference.
- the voltage clamping unit may further limit a difference between a respective potential at the motor terminals and a potential at the second DC link terminal to a predetermined second potential difference.
- the first and the second potential difference may be identical or different.
- the first and the second potential difference may amount to approximately 30 V, for example.
- the coupling unit has an active feedback unit, which transfers energy from the voltage clamping unit into an intermediate circuit of an inverter connected to the first intermediate circuit connection and to the second intermediate circuit connection.
- the regenerative unit has at least one step-down converter.
- the regenerative unit has at least one flyback converter.
- the voltage clamping unit comprises a first voltage clamping subunit which measures a difference between the respective potentials at the Motor terminals and the potential at the first DC link connection limited to the predetermined first potential difference.
- the voltage clamping unit further comprises a second voltage clamping subunit that limits a difference between the respective potential at the motor terminals and the potential at the second intermediate circuit terminal to the predetermined second potential difference.
- the regeneration unit has a first regenerative subunit unit, which transfers energy from the first voltage clamping subunit into an intermediate circuit of an inverter connected to the first intermediate circuit terminal and to the second intermediate circuit terminal.
- the regenerative unit has a second feedback subunit unit, which transfers energy from the second voltage clamping subunit into the intermediate circuit of the inverter connected to the first intermediate circuit terminal and to the second intermediate circuit terminal.
- FIG. 1 shows a drive system with an inverter, a filter unit according to the invention and an electric motor
- FIG. 2 shows a first embodiment of a regenerative unit of the type shown in FIG.
- FIG. 3 shows a further embodiment of a regenerative unit of the type shown in FIG.
- FIG. 4 shows an exemplary output voltage characteristic of that shown in FIG. 1
- Fig. 1 shows a drive system with a frequency converter 6 and a conventional electric motor 3, which is driven by the frequency converter 6.
- the frequency converter 6 has a conventional inverter 2 and a filter unit 1 according to the invention connected downstream of the inverter 2 and forming a du / dt filter.
- the inverter 2 (also inverter) converts a DC voltage to AC voltage or a DC to AC.
- the inverter may, for example, conventionally have a number of controllable inverter bridges which are acted upon by an intermediate circuit voltage and which are controlled as a function of output voltages to be generated.
- controllable inverter bridges which are acted upon by an intermediate circuit voltage and which are controlled as a function of output voltages to be generated.
- the filter unit 1 is connected between the inverter 2 and the electric motor 3.
- the filter unit 1 has three phase terminals Ue, Ve, We for connecting to corresponding phase terminals 2a, 2b, 2c of the inverter 2.
- the filter unit 1 further has a first intermediate circuit connection ZK + for connection to a first intermediate circuit connection 2d of the inverter 2 and a second intermediate circuit connection ZK- for connection to a second intermediate circuit connection 2e of the inverter 2.
- the filter unit 1 further has three motor connections Ua, Va, Wa for connection to corresponding phase-phase connections 3a, 3b, 3c of the electric motor 3.
- the filter unit 1 further has three filter elements L1, L2, L3 in the form of throttles or coils for reducing a voltage rise speed at the motor terminals Ua, Va, Wa of the filter unit 1.
- the first coil L1 is connected between the first phase terminal Ue and the first motor terminal Ua
- the second coil L2 is connected between the second phase terminal Ve and the second motor terminal Va
- the third coil L3 is connected between the third phase terminal We and the third motor terminal Wa ,
- the filter unit 1 further has a coupling unit 4, which capacitively couples the coils L1, L2, L3 at their motor terminal side to the first intermediate circuit terminal ZK + and the second intermediate circuit terminal ZK-.
- the coupling unit 4 has six capacitors C1 to C6, which are designed as ceramic capacitors.
- the capacitor C1 is connected between the terminal of the coil L1 coupled to the first motor terminal Ua and the first intermediate circuit terminal ZK +, and the capacitor C2 is connected between those coupled to the second motor terminal Va Connection of the coil L2 and the first intermediate circuit terminal ZK + is looped in
- the capacitor C3 is connected between the terminal of the coil L3 coupled to the third motor terminal Wa and the first intermediate circuit terminal ZK +
- the capacitor C4 is connected between the terminal of the coil L1 coupled to the first motor terminal Ua and the second intermediate circuit terminal ZK- looped in
- the capacitor C5 is between the coupled to the second motor terminal Va terminal of the coil L2 and the second
- DC link ZK- looped in and the capacitor C6 is between the coupled to the third motor terminal Wa terminal of the coil L3 and the second
- the coupling unit 4 has a voltage clamping unit comprising a first voltage clamping subunit 5a and a second voltage clamping subunit 5b, which has a difference between a respective potential at the motor terminals Ua, Va, Wa and a potential at the first DC link ZK + to a predetermined first potential difference of approximately Limits 30 V and a difference between a respective potential at the motor terminals Ua, Va, Wa and a potential at the second DC link ZK- limited to a predetermined second potential difference of magnitude about 30 V.
- the first voltage clamping section unit 5a limits the difference between the respective potential at the motor terminals Ua, Va, Wa and the potential at the first DC link ZK + to the predetermined first potential difference
- the second voltage clamping section 5b limits the difference between the respective potential at the motor terminals Ua, Va , Wa and the potential at the second DC link ZK- to the predetermined second potential difference.
- the first voltage clamping unit 5a has diodes D1, D2, D3, D7, a capacitor C7 and a resistor R1 in the illustrated circuit.
- the diode D1 is electrically connected on the anode side to that terminal of the coil L1, which is electrically connected to the first motor terminal Ua.
- the diode D2 is electrically connected on the anode side to that terminal of the coil L2, which is electrically connected to the second motor terminal Va.
- the diode D3 is electrically connected on the anode side to that terminal of the coil L3, which is electrically connected to the third motor terminal Wa.
- the diodes D1 to D3 are electrically connected to each other.
- the resistor R1 is connected between the cathodes of the diodes D1 to D3 and the terminal ZK +.
- the diode D7 is electrically connected with its anode to the cathodes of the diodes D1 to D3 and electrically connected to its cathode with an output KK1 of the first voltage clamping part unit 5a. Between the exit KK1 the first voltage clamping unit 5a and the terminal ZK +, the capacitor C7 is looped.
- the second voltage clamp subunit 5b has diodes D4, D5, D6, D8, a capacitor C8, and a resistor R2 in the illustrated circuitry.
- the diode D4 is electrically connected on the cathode side to that terminal of the coil L1, which is electrically connected to the first motor terminal Ua.
- the diode D5 is electrically connected on the cathode side to that terminal of the coil L2, which is electrically connected to the second motor terminal Va.
- the diode D6 is electrically connected on the cathode side to that terminal of the coil L3, which is electrically connected to the third motor terminal Wa. On the anode side, the diodes D4 to D6 are electrically connected together.
- the resistor R2 is connected between the anodes of the diodes D4 to D6 and the terminal ZK-.
- the diode D8 is electrically connected at its cathode to the anodes of the diodes D4 to D6 and electrically connected at its anode to an output KK2 of the second voltage clamping subunit 5b. Between the output KK2 of the second voltage clamping subunit 5b and the terminal ZK- the capacitor C8 is looped.
- the coupling unit 4 further has a regenerative unit comprising a first feedback subunit RS1 and a second regenerative subunit RS2, which transfers energy from the voltage clamping subunits 5a, 5b into the intermediate circuit of the inverter 2.
- the first regenerative subunit RS1 transfers power from the first voltage clamping subunit 5a to the intermediate circuit of the inverter 2
- the second regenerative subunit RS2 transfers power from the second voltage clamping subunit 5b to the intermediate circuit of the inverter 2.
- FIG. 2 shows a first embodiment of a regenerative unit comprising the
- Regenerating subunits RS1 and RS2 are each designed as potential-connecting buck converters.
- the regenerative subunit RS1 has a capacitor C9, a
- the regenerative subunit RS2 has a capacitor C10, a
- Field effect transistor M2 a diode D10 and a coil L5 in the illustrated circuit.
- FIG. 3 shows a further embodiment of a regenerative unit comprising the
- Regenerating subunits RS1 and RS2 are each designed as a flyback converter.
- the Regenerating subunit RS1 has a capacitor C9, a transformer Tr1, a field effect transistor M1 and a diode D9 in the illustrated circuit.
- the feedback subunit RS2 has a capacitor C10, a transformer Tr2, a field effect transistor M2 and a diode D10 in the illustrated circuit.
- FIG. 4 shows an exemplary output voltage curve Ua of the filter unit 1 shown in FIG. 1 compared to an idealized output voltage curve Ua 'without the use of a filter unit 1.
- the capacitors C1 to C6 are preferably designed as ceramic capacitors, which derive due to the voltage dependence of the capacitance on ZK + and ZK-. This approximately achieves a constant capacitance across the voltage.
- the capacitors C1 to C6 each clamped to ZK + and ZK-, then for the respective switching operation, for example, the resonant circuit of L1, C1 parallel C4 is effective.
- the inductor L1 and the capacitors C1 act in parallel C4, i.e., in the case of the resonant circuit.
- the motor-side inductance is much larger than Lf and thus negligible.
- Cable capacitances have an increasing effect on Cf and additionally act as a filter capacitance, with Cy remaining active in the inverter 2 in the return path.
- a capacitor row C1 to C3 or C4 to C6 omitted.
- the remaining capacitors should then preferably be designed as film capacitors, so that the capacitance values are independent of the voltage.
- a free-swinging transient would increase to approximately twice the DC link voltage Vzk, but is reduced to a value of Vclamp by the diodes D1 to D6, e.g. 30V clamped above or below the DC voltage.
- the filter unit 1 according to the invention has the following advantages:
- Frequency converter can be integrated
- Parameters of the active filter unit (du / dt, clamping voltage, damping) can be dimensioned independently of each other
- the outputs of the filter elements or coils L1 to L3 are capacitively coupled to the intermediate circuit ZK +, ZK- by means of the capacitors C1 to C6.
- the use of low-inductance ceramic capacitors is advantageous here, since a favorable EMC behavior is achieved.
- the two feedback subunits RS1 and RS2 ideally keep the respective voltage across C9 and C10 independent of the load, to constant values, e.g. 30 V.
- the regenerative partial units RS1 and RS2 can be implemented, for example, as a potential-connecting step-down converter according to FIG. 2 or as a flyback converter according to FIG.
- the variant with flyback converter has the advantage that they can be constructed identically on the primary side and also the semiconductors would work in a more favorable operating point, as the solution with potential-connecting buck converter.
- the filter unit 1 is itself integrable due to their implementation in the frequency converter 6. With du / dt filters of conventional technology this would not be possible due to the construction volume, the weight and the electrical losses.
- the filter unit 1 may be provided on a circuit board of the frequency converter 6, for example be on the power semiconductor of the inverter 2 are provided. This is also useful for EMC reasons, since the return paths to ZK + and ZK - should have the lowest possible inductances.
- the electric motor 3 can be directly, i. by the shortest route to be connected to the motor connections Ua, Va, Wa.
- a, for example, shielded, cable connection between the motor terminals Ua, Va, Wa and the motor can be provided.
- the capacities of the possibly shielded cable connection can have considerable additional capacities and thus additionally reduce the voltage rise speed. This can have an influence on the design of the filter unit 1, in particular on the dimensioning of the capacitors C1 to C8.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018204090.7A DE102018204090A1 (en) | 2018-03-16 | 2018-03-16 | Filter unit and frequency converter |
PCT/EP2019/056637 WO2019175429A1 (en) | 2018-03-16 | 2019-03-15 | Filter unit and frequency inverter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3766171A1 true EP3766171A1 (en) | 2021-01-20 |
Family
ID=65818021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19711900.1A Pending EP3766171A1 (en) | 2018-03-16 | 2019-03-15 | Filter unit and frequency inverter |
Country Status (5)
Country | Link |
---|---|
US (1) | US11374485B2 (en) |
EP (1) | EP3766171A1 (en) |
CN (1) | CN112189303A (en) |
DE (1) | DE102018204090A1 (en) |
WO (1) | WO2019175429A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116827209B (en) * | 2023-06-30 | 2024-03-12 | 江苏环成玖源节能科技有限公司 | Enhanced driving circuit and servo driver applied by same |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI70493C (en) * | 1982-08-19 | 1986-09-19 | Stroemberg Oy Ab | EXTINGUISHING EQUIPMENT WITHOUT SPRING |
JPH06292365A (en) * | 1992-10-30 | 1994-10-18 | Fuji Electric Co Ltd | Method and device for controlling pwm inverter |
DE9307806U1 (en) * | 1993-05-24 | 1993-08-26 | Siemens Ag | Inverter output filter |
DE19612920A1 (en) * | 1996-04-01 | 1997-10-02 | Asea Brown Boveri | Method and device for direct torque control of an induction machine |
JP3372436B2 (en) * | 1996-11-28 | 2003-02-04 | オークマ株式会社 | Inverter control device |
DE102005045552B4 (en) * | 2005-09-23 | 2008-04-17 | Siemens Ag | circuitry |
DE102006032491A1 (en) * | 2006-07-13 | 2008-01-17 | Siemens Ag | Method and device for determining the rotor position in a brushless and sensorless electric motor |
AT505534B1 (en) * | 2007-08-06 | 2011-07-15 | Felix Dipl Ing Dr Himmelstoss | RESONANT START-UP RELIEF |
KR100948519B1 (en) * | 2007-10-30 | 2010-03-23 | 현대엘리베이터주식회사 | Elevator driving inverter system without electrolytic capacitor |
JP4535148B2 (en) * | 2008-03-03 | 2010-09-01 | 株式会社デンソー | Drive control device and drive control system for power conversion circuit |
US9397658B2 (en) * | 2014-06-25 | 2016-07-19 | Freescale Semiconductor, Inc. | Gate drive circuit and a method for controlling a power transistor |
DE102015215886A1 (en) * | 2015-08-20 | 2017-02-23 | Robert Bosch Gmbh | Inverter circuit comprising a circuit arrangement for the regenerative damping of electrical oscillations and method for the regenerative damping of electrical oscillations |
DE102015221359A1 (en) | 2015-10-30 | 2017-05-04 | Schmidhauser Ag | Power recovery unit and electric drive system |
DE102015221354A1 (en) | 2015-10-30 | 2017-05-04 | Schmidhauser Ag | Power recovery unit and electric drive system |
DE102015225095A1 (en) * | 2015-12-14 | 2017-06-14 | Robert Bosch Gmbh | Voltage converter, electric drive system and method for reducing interference voltages |
US10211827B2 (en) * | 2017-01-31 | 2019-02-19 | Ford Global Technologies, Llc | Resonant gate driver |
-
2018
- 2018-03-16 DE DE102018204090.7A patent/DE102018204090A1/en active Pending
-
2019
- 2019-03-15 US US16/981,324 patent/US11374485B2/en active Active
- 2019-03-15 CN CN201980032615.3A patent/CN112189303A/en active Pending
- 2019-03-15 WO PCT/EP2019/056637 patent/WO2019175429A1/en active Application Filing
- 2019-03-15 EP EP19711900.1A patent/EP3766171A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US20210067029A1 (en) | 2021-03-04 |
US11374485B2 (en) | 2022-06-28 |
DE102018204090A1 (en) | 2019-09-19 |
WO2019175429A1 (en) | 2019-09-19 |
CN112189303A (en) | 2021-01-05 |
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