DE3912706A1 - Method of reducing noise in pulse-controlled machine - using mean values of wide range of frequencies from pulse generator for processing by pulse width modulator to match control parameters - Google Patents

Method of reducing noise in pulse-controlled machine - using mean values of wide range of frequencies from pulse generator for processing by pulse width modulator to match control parameters

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Publication number
DE3912706A1
DE3912706A1 DE19893912706 DE3912706A DE3912706A1 DE 3912706 A1 DE3912706 A1 DE 3912706A1 DE 19893912706 DE19893912706 DE 19893912706 DE 3912706 A DE3912706 A DE 3912706A DE 3912706 A1 DE3912706 A1 DE 3912706A1
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DE
Germany
Prior art keywords
pulse
generator
pulse width
frequencies
control parameters
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Withdrawn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
DE19893912706
Other languages
German (de)
Inventor
Alois Dr Ing Weschta
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.)
Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19893912706 priority Critical patent/DE3912706A1/en
Publication of DE3912706A1 publication Critical patent/DE3912706A1/en
Withdrawn legal-status Critical Current

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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A method of noise reduction during the operation of a pulse controller rotating field machine (2) makes use of a range of frequencies from a generator (4). The complete output spectrum of generator (4) is processed within a recognised distribution regime, e.g. gaussian. A mean value for amplitude and pulse width is arrived at which matches predetermined values (Ft and DF) for a single discrete pulse but is made up of the composite noise spectrum from generator (4). Machine control parameters (a) voltage and (f1) pulse width are fed to the PWM (3) from a separate source (not shown) for regulating the main power suoply unit (1). USE/ADVANTAGE - For speed and torque control of rotating machines. Avoids resonance associated with fixed frequency pulsed system and loss generating harmonics in connected equipment. Eliminates need for filters and chokes. Does not require rapid response semiconductors in main power supply.

Description

Die Erfindung betrifft ein Verfahren zum geräuscharmen Betrieb einer von einem Pulswechselrichter gespeisten Maschine mit den im Oberbegriff des Patentanspruchs angegebenen Merkmalen.The invention relates to a method for quiet operation a machine powered by a pulse inverter with the Features specified in the preamble of the claim.

Für den Betrieb einer Maschine wird häufig ein bestimmter, ins­ besondere sinusförmiger Verlauf der Speisespannung oder des Speisestroms gewünscht. Dieser wird üblicherweise erzeugt, in dem ein entsprechender Sollwert mit einer vorgegebenen Modula­ tionsfrequenz moduliert wird. Z.B. kann eine mit der hochfre­ quenten Modulationsfrequenz erzeugte Sägezahnspannung mit der entsprechenden Sollspannungskurve verglichen werden, um aus den Schnittpunkt der beiden Kurven die Steuerimpulse für die Ven­ tile des Pulswechselrichters zu ermitteln.For the operation of a machine, a specific, ins special sinusoidal curve of the supply voltage or Power supply required. This is usually generated in a corresponding setpoint with a given modula tion frequency is modulated. E.g. can one with the hochfre quent modulation frequency generated sawtooth voltage with the corresponding target voltage curve can be compared to from the Intersection of the two curves the control impulses for the Ven to determine the tile of the pulse inverter.

Die Vorgabe der Modulationsfrequenz ist dabei vom Betriebszu­ stand der Maschine bestimmt. Um Nichtlinearitäten und Schwe­ bungen zu vermeiden, wird häufig die Modulationsfrequenz als Oberfrequenz der Betriebsfrequenz vorgegeben und derart syn­ chronisiert, daß beim Nulldurchgang des Sollwertes jeweils eine Periode des Modulationstaktes gestartet wird. Damit bei hohen Modulationsfrequenzen die Breite der Pulsen und Pausen die Schonzeit der Halbleiterventile des Pulswechselrichters nicht unterschreiten, ist es dann oft erforderlich, nicht nur die Modulationsfrequenz proportional zur Betriebsfrequenz zu ändern, sondern auch von einem Proportionalitätsfaktor auf ei­ nen anderen überzugehen, d.h. die Anzahl der Pulse, in die ei­ ne Periode des Sollwertes zerlegt wird, zu variieren. Diese Variationen der Modulationsfrequenz erfolgen daher stets in Ab­ hängigkeit vom Betriebszustand der Maschine und des Umrichters. The specification of the modulation frequency is dependent on the operating mode the machine was determined. To nonlinearities and Schwe Avoiding exercises is often called the modulation frequency Upper frequency of the operating frequency specified and syn chronized that at the zero crossing of the setpoint a period of the modulation clock is started. With that high modulation frequencies the width of the pulses and pauses the protective period of the semiconductor valves of the pulse inverter then it is often necessary, not only the modulation frequency is proportional to the operating frequency change, but also from a proportionality factor to egg to pass over to another, i.e. the number of pulses into which egg ne period of the setpoint is broken down to vary. These Variations in the modulation frequency are therefore always in Ab dependence on the operating state of the machine and the converter.  

Dabei kann es aber insbesondere im stationären Betrieb der Ma­ schine zu deutlich wahrnehmbaren Oberschwingungen im Geräusch­ spektrum der Maschine kommen. Sowohl Transformatoren und elek­ trische Teile der Anlage wie auch Lagerschild, Gehäuse und an­ dere mechanische Teile der Maschine besitzen Eigenfrequenzen, die z.B. bei Modulationsfrequenzen im Bereich von 1 bis 2 kHz, wie sie bei Pulswechselrichtern häufig verwendet werden, ange­ regt werden und einen unangenehmen Ton erzeugen. Dieser Effekt verstärkt sich, wenn mehrere Maschinen im gleichen Raum betrie­ ben werden.But it can be especially in the stationary operation of the Ma seem to clearly perceptible harmonics in the noise range of the machine. Both transformers and elec trical parts of the system such as end shield, housing and mechanical parts of the machine have natural frequencies, e.g. at modulation frequencies in the range of 1 to 2 kHz, as they are often used in pulse inverters be excited and produce an unpleasant sound. This effect increases when several machines are operated in the same room be.

Da Oberschwingungen in den elektrischen Größen der Maschine auch zu elektrischen Verlusten führen, sind häufig Drosseln oder Filter am Ausgang des Pulswechselrichters angeordnet. Um aber deren Geräusche zu vermindern, sind dann z.B. geräuscharme Dros­ selspulen erforderlich. Eine andere Möglichkeit ist, eine sehr hohe Pulsfrequenz zu verwenden, z.B. im Bereich von 5 kHz oder mehr, wodurch sich einerseits die Annäherung der pulsbreiten­ modulierten Steuerimpulse an die gewünschte Kurvenform des Soll­ wertes verbessert und daher die Verluste verringert werden, an­ dererseits die Modulationsfrequenzen nicht mehr im Anregungsbe­ reich störender akustischer Schwingungen liegt. Ein derartiges Verfahren ist z.B. in der deutschen Offenlegungsschrift 32 30 058 für den Betrieb einer Umwälzepumpe in einem Heizungsrohrsystem beschrieben. Derartig hohe Modulationsfrequenzen erfordern aber besonders schnelle Ventile.Because harmonics in the electrical quantities of the machine also lead to electrical losses, are often chokes or Filters arranged at the output of the pulse inverter. But around To reduce their noise, e.g. silent Dros Selspulen required. Another option is a very one to use high pulse frequency, e.g. in the range of 5 kHz or more, whereby on the one hand the approximation of the pulse widths modulated control pulses to the desired curve shape of the target value improved and therefore the losses are reduced on the other hand, the modulation frequencies are no longer in the excitation range richly disturbing acoustic vibrations. Such a thing The procedure is e.g. in German Offenlegungsschrift 32 30 058 for the operation of a circulation pump in a heating pipe system described. Such high modulation frequencies, however, require particularly fast valves.

Der Erfindung liegt die Aufgabe zugrunde, durch einen Eingriff in die Steuerung des Pulswechselrichters einen geräuscharmen Be­ trieb der Maschine zu ermöglichen.The invention has for its object through an intervention in the control of the pulse inverter a low-noise loading drive the machine to enable.

Diese Aufgabe wird gelöst, durch ein Verfahren mit den Merkmalen des Patentanspruchs. Die Erfindung wird anhand des in Fig. 1 ge­ zeigten Ausführungsbeispiels und der in Fig. 2 dargestellten Modu­ lationssignale näher erläutert.This object is achieved by a method with the features of the patent claim. The invention is explained in more detail using the exemplary embodiment shown in FIG. 1 and the modulation signals shown in FIG. 2.

Fig. 1 zeigt einen von einer vorgegebenen Gleichspannung, z.B. der eingeprägten Zwischenkreis-Gleichspannung eines Spannungs­ zwischenkreis-Umrichters, gespeisten Umrichter 1, an den eine Drehfeldmaschine 2 angeschlossen ist. Für die Speisespannung der Maschine 2 ist von einer nicht dargestellten Regelung ein Sollwert a und eine Sollfrequenz fl vorgegeben. Diese Sollwer­ te bestimmen den in Fig. 2 mit R dargestellten Verlauf des Soll­ wertes, der in einem Pulsbreiten-Modulator PWM mit einer Modula­ tionsspannung D verglichen wird. Die Schnittpunkte bestimmen eine pulsbreitenmodulierte Steuerspannung S, aus deren Flanken die Steuerimpulse für die Ventile des Umrichters 1 abgeleitet werden. Fig. 1 shows one of the embossed intermediate circuit dc voltage of a voltage intermediate-circuit converter, fed inverter 1 is connected to a rotating-field machine 2 of a predetermined DC voltage, for example. For the supply voltage of the machine 2 , a setpoint a and a setpoint frequency fl are specified by a control system, not shown. These setpoints determine the course of the setpoint shown in FIG. 2 with R , which is compared with a modulation voltage D in a pulse width modulator PWM . The intersection points determine a pulse-width-modulated control voltage S , from the edges of which the control pulses for the valves of the converter 1 are derived.

Dieser, nach dem bekannten "Unterschwingungsverfahren" arbeiten­ de Pulsbreitenmodulator wird von einem Steuersignal f T gespeist, das die Frequenz des Sägezahns D angibt. Dieses Steuersignal f T für die Modulationsfrequenz kann im Stand der Technik in Ab­ hängigkeit von den Sollwerten a und fl im Modulator PWM selbst gebildet sein, so daß ein eigener Steuereingang nicht vorhanden ist. Insbesondere kann als Pulsbreitenmodulator ein Mikroprozes­ sor verwendet sein, der ohne eine direkte Bildung der Sägezahn­ spannung die Steuerflanken des Steuersignals S errechnet.This pulse width modulator, which operates according to the known "undershoot method", is fed by a control signal f T which indicates the frequency of the sawtooth D. This control signal f T for the modulation frequency can be formed in the prior art as a function of the setpoints a and fl in the modulator PWM itself, so that a separate control input is not available. In particular, a microprocessor can be used as the pulse width modulator, which calculates the control edges of the control signal S without a direct formation of the sawtooth voltage.

Die Modulationsfrequenz ändert sich beim Stand der Technik nicht oder nur in Abhängigkeit von Änderungen des Betriebszustandes der Maschine. Im stationären Zustand ist die Modulationsfrequenz konstant.The modulation frequency does not change in the prior art or only depending on changes in the operating status the machine. The modulation frequency is in the stationary state constant.

Im Gegensatz hierzu ist in Fig. 1 der Pulsbreitenmodulator PWM von einem Steuersignal f T für die Modulationsfrequenz angesteuert. Dieser Generator GEN kann z.B. ein Rauschgenerator sein, der nach einer statistischen Berechnung die Modulationsfrequenz f T liefert, für die ein Mittelwert Ft und eine Bandbreite DF vor­ gegeben ist. Dadurch kann z.B. eine Gauß-Verteilung der Modula­ tionsfrequenz f T erzielt werden. In contrast to this, the pulse width modulator PWM in FIG. 1 is controlled by a control signal f T for the modulation frequency. This generator GEN can be, for example, a noise generator which, after a statistical calculation, supplies the modulation frequency f T for which an average value Ft and a bandwidth DF are given. In this way, for example, a Gaussian distribution of the modulation frequency f T can be achieved.

Im Frequenzspektrum der Ausgangsspannung entsteht dann statt einer einzigen, hohen Spektrallinie ein mehr oder weniger kon­ tinuierliches Spektrum mit einem deutlich niedrigeren Spitzen­ wert. Entsprechend ändert sich auch das Geräuschspektrum der Maschine. Die Pulsfrequenz ist dann nicht mehr als störender Einzelton wahrnehmbar, sondern nur noch als ein Rauschen.This then takes place in the frequency spectrum of the output voltage a single, high spectral line a more or less con Continuous spectrum with a significantly lower peak value. The noise spectrum of the also changes accordingly Machine. The pulse frequency is then no more than disturbing Perceptible single tone, but only as a noise.

Der Erfindung liegt also der Gedanke zugrunde, die Pulsbreiten­ modulation nicht mit einer einzelnen, zumindest im stationären Zustand konstanten Taktfrequenz f T vorzunehmen, vielmehr wird die Modulationsfrequenz selbst innerhalb des durch die Band­ breite DF gegebenen Frequenzbereiches ständig moduliert. Der Mittelwert Ft dieses Frequenzbereiches kann dabei durchaus in Abhängigkeit vom Betriebszustand der Maschine veränderlich sein, also z.B. in Abhängigkeit von den Sollwerten a und fl vorgegeben werden, die in der nicht dargestellten Regelung gebildet sind.The invention is therefore based on the idea of not performing the pulse width modulation with a single clock frequency f T , which is at least constant in the steady state, rather the modulation frequency is continuously modulated even within the frequency range given by the band-wide DF . The mean value Ft of this frequency range can certainly be variable depending on the operating state of the machine, that is to say it can be predetermined, for example, depending on the setpoints a and fl , which are formed in the control system, not shown.

Der Generator GEN kann ein Zufallsgenerator oder auch ein digi­ taler Generator zur Erzeugung von Pseudozufallszahlen sein. Die Änderung der Modulationsfrequenz f T kann kontinuierlich oder zu diskreten Zeitpunkten erfolgen. Insbesondere ist es möglich, die Frequenzänderung nur dann vorzunehmen, wenn jeweils eine ganze oder eine halbe Periode der Dreieckspannung D abgeschlossen ist. Der Generator kann mit diskreten Bauelementen oder als Mikro­ computer aufgebaut sein.The generator GEN can be a random generator or a digital generator for generating pseudo random numbers. The modulation frequency f T can be changed continuously or at discrete times. In particular, it is possible to make the frequency change only when a whole or half a period of the triangular voltage D is completed. The generator can be constructed with discrete components or as a micro computer.

Es ist nicht erforderlich, den Generator als eigenes Bauteil dem Pulsbreitenmodulator vorzuschalten. Vielmehr kann z.B. im Modu­ lator eine Vielzahl von Pulsmustern gespeichert sein, aus denen dann nach einem statistischen Auswahlverfahren jeweils ein Puls­ muster für die Ansteuerung der Ventile ausgewählt wird.It is not necessary to use the generator as a separate component Upstream pulse width modulator. Rather, e.g. in the modu a variety of pulse patterns can be stored from which then one pulse each after a statistical selection process pattern for the control of the valves is selected.

Claims (1)

Verfahren zum geräuscharmen Betrieb einer von einem Pulswechsel­ richter gespeisten Maschine, wobei die Steuerimpulse des Puls­ wechselrichters durch Modulations eines Sollwertes mit einer veränderlich vorgegebenen Modulationsfrequenz erzeugt werden, dadurch gekennzeichnet, daß die Modu­ lationsfrequenz innerhalb eines vorgegebenen Frequenzbandes ständig und unabhängig vom Betriebszustand der Maschine und des Umrichters variiert wird.Method for low-noise operation of a machine fed by a pulse changer, the control pulses of the pulse inverter being generated by modulating a setpoint with a variably predetermined modulation frequency, characterized in that the modulation frequency within a predetermined frequency band is constant and independent of the operating state of the machine and the Inverter is varied.
DE19893912706 1989-04-18 1989-04-18 Method of reducing noise in pulse-controlled machine - using mean values of wide range of frequencies from pulse generator for processing by pulse width modulator to match control parameters Withdrawn DE3912706A1 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685923A1 (en) * 1994-06-03 1995-12-06 Inventio Ag Low noise operation of a pulsed inverter fed motor
GB2295252A (en) * 1994-11-21 1996-05-22 Daimler Benz Ag Noise reducing system
DE19651281A1 (en) * 1996-12-10 1998-06-25 Still Gmbh Modulation process and noise reduction for frequency converters e.g. for power supply of three=phase machine
DE19959657A1 (en) * 1999-08-20 2001-03-08 Hoermann Kg Antriebstechnik Controlling and/or regulating an alternating current or 3-phase motor e.g. for door mechanism, involves driving motor with stochastic signal pulses with probability density modulated according to desired drive function
EP1134878A1 (en) * 2000-03-13 2001-09-19 Alstom Belgium S.A. Method and device for reduction of harmonics in power converters
EP1184961A1 (en) * 2000-08-21 2002-03-06 Motorola, Inc. Apparatus and method for reducing noise in a switch mode power management system
EP1411205A2 (en) * 2002-10-17 2004-04-21 Hunter Douglas Industries B.V. Power conversion unit and method of providing power to a window covering
WO2011117278A1 (en) 2010-03-25 2011-09-29 Siemens Aktiengesellschaft Method for operating a ship drive motor fed by at least one pulse width modulated inverter, and ship drive system
WO2019206554A1 (en) * 2018-04-27 2019-10-31 Siemens Mobility GmbH Method for controlling a pulse-width modulation inverter
WO2022258256A1 (en) * 2021-06-11 2022-12-15 Robert Bosch Gmbh Power converter with dynamic carrier frequency variation

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US3579091A (en) * 1969-05-16 1971-05-18 Bell Telephone Labor Inc Switching regulator with random noise generator
EP0360210A2 (en) * 1988-09-20 1990-03-28 Hitachi, Ltd. Control apparatus and method for controlling an inverter for driving AC motor

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US3579091A (en) * 1969-05-16 1971-05-18 Bell Telephone Labor Inc Switching regulator with random noise generator
EP0360210A2 (en) * 1988-09-20 1990-03-28 Hitachi, Ltd. Control apparatus and method for controlling an inverter for driving AC motor

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685923A1 (en) * 1994-06-03 1995-12-06 Inventio Ag Low noise operation of a pulsed inverter fed motor
US5625542A (en) * 1994-06-03 1997-04-29 Inventio Ag Low-noise operation of a machine fed by a pulse inverter
CN1042278C (en) * 1994-06-03 1999-02-24 英万蒂奥股份公司 Low-noise operation of a machine fed by a pulse in verter
GB2295252A (en) * 1994-11-21 1996-05-22 Daimler Benz Ag Noise reducing system
FR2727782A1 (en) * 1994-11-21 1996-06-07 Daimler Benz Ag METHOD FOR APPLYING A PULSATORY OR PULSED OR CONTROLLED FLOW OF FORCE OR ACTION TO A DEVICE OR INSTALLATION
GB2295252B (en) * 1994-11-21 1997-02-12 Daimler Benz Ag A method of reducing resonance noise in a device or system
US6095029A (en) * 1994-11-21 2000-08-01 Daimlerchrysler Ag Method for supplying a device or system with an alternating, pulsating, or cyclic flow of power or energy
DE19651281A1 (en) * 1996-12-10 1998-06-25 Still Gmbh Modulation process and noise reduction for frequency converters e.g. for power supply of three=phase machine
DE19651281C2 (en) * 1996-12-10 1999-11-04 Still Gmbh Modulation method for controlling an inverter
DE19959657A1 (en) * 1999-08-20 2001-03-08 Hoermann Kg Antriebstechnik Controlling and/or regulating an alternating current or 3-phase motor e.g. for door mechanism, involves driving motor with stochastic signal pulses with probability density modulated according to desired drive function
EP1134878A1 (en) * 2000-03-13 2001-09-19 Alstom Belgium S.A. Method and device for reduction of harmonics in power converters
WO2001069765A1 (en) * 2000-03-13 2001-09-20 Alstom Belgium S.A. Method and device for reducing harmonics in power converters
EP1184961A1 (en) * 2000-08-21 2002-03-06 Motorola, Inc. Apparatus and method for reducing noise in a switch mode power management system
EP1411205A2 (en) * 2002-10-17 2004-04-21 Hunter Douglas Industries B.V. Power conversion unit and method of providing power to a window covering
EP1411205A3 (en) * 2002-10-17 2005-05-11 Hunter Douglas Industries B.V. Power conversion unit and method of providing power to a window covering
WO2011117278A1 (en) 2010-03-25 2011-09-29 Siemens Aktiengesellschaft Method for operating a ship drive motor fed by at least one pulse width modulated inverter, and ship drive system
AU2011231682B2 (en) * 2010-03-25 2013-11-14 Siemens Aktiengesellschaft Method for operating a ship drive motor fed by at least one pulse width modulated inverter, and ship drive system
RU2514383C1 (en) * 2010-03-25 2014-04-27 Сименс Акциенгезелльшафт Method of operation of ship drive motor supplied by pdm-inverter and ship drive system
KR101485647B1 (en) * 2010-03-25 2015-01-22 지멘스 악티엔게젤샤프트 Method for operating a ship drive motor fed by at least one pulse width modulated inverter, and ship drive system
WO2019206554A1 (en) * 2018-04-27 2019-10-31 Siemens Mobility GmbH Method for controlling a pulse-width modulation inverter
DE102018206596A1 (en) * 2018-04-27 2019-12-24 Siemens Mobility GmbH Method for controlling a pulse inverter, use, control unit and stationary or mobile system
WO2022258256A1 (en) * 2021-06-11 2022-12-15 Robert Bosch Gmbh Power converter with dynamic carrier frequency variation

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