DE19532377A1 - Supply of AC load especially AC motor - Google Patents

Supply of AC load especially AC motor

Info

Publication number
DE19532377A1
DE19532377A1 DE19532377A DE19532377A DE19532377A1 DE 19532377 A1 DE19532377 A1 DE 19532377A1 DE 19532377 A DE19532377 A DE 19532377A DE 19532377 A DE19532377 A DE 19532377A DE 19532377 A1 DE19532377 A1 DE 19532377A1
Authority
DE
Germany
Prior art keywords
load
current
switched
load current
branch
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Withdrawn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
DE19532377A
Other languages
German (de)
Inventor
Walter Megerle
Gerhard Tritt
Helmut Plener
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 Seuffer GmbH and Co KG
Original Assignee
Robert Seuffer GmbH and Co KG
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 Seuffer GmbH and Co KG filed Critical Robert Seuffer GmbH and Co KG
Priority to DE19532377A priority Critical patent/DE19532377A1/en
Publication of DE19532377A1 publication Critical patent/DE19532377A1/en
Withdrawn legal-status Critical Current

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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/04—Single phase motors, e.g. capacitor motors
    • 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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
    • 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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A procedure for supplying an inductive load with AC has the load current adjustment done in pulses using a variable keying ratio. The sinusoidal current is switched at multiples of its frequency. Parallel to the load into at least one freewheeling branch is passed the inductive energy arising from the switching. Each freewheeling branch is controlled synchronously with the half waves of the load current, the load current and freewheel current being switched in push-pull, and has a bipolar switch which closes the circuit when the load circuit is opened. The switch is operated by pulse width modulation.

Description

In der deutschen Patentanmeldung P 44 28 682.1-32 sind ein Verfahren nach dem Oberbegriff des Patentanspruches 1 und eine Vorrichtung nach dem Oberbegriff des Patentanspruchs 2 beschrieben, bei denen mit gegenüber herkömmlichen Verfahren und Vorrichtungen vereinfachten Hilfsmitteln eine gesteuerte Versorgung einer blindan­ teilbehafteten Wechselstromlast erreicht wird.German patent application P 44 28 682.1-32 describes a process according to Preamble of claim 1 and a device according to the preamble of Described claim 2, in which with compared to conventional methods and devices simplified aids a controlled supply of a blind partially affected AC load is reached.

Durch die in den kennzeichnenden Teilen des Patentanspruches 1 und des Patentan­ spruches 2 angegebene Erfindung werden weitere vereinfachte Hilfsmittel für das Verfah­ ren und für die Vorrichtung geschaffen.By in the characterizing parts of claim 1 and the patent Proverb 2 specified invention are further simplified tools for the procedure ren and created for the device.

Bei der Erfindung ist bevorzugt in der Netzzuleitung zur Wechselstromlast, insbesondere Wechselstrommotor, ein schneller bipolarer Schalter geschaltet. Parallel zur Wechsel­ stromlast ist ein weiterer schneller bipolarer Schalter in einem Freilaufkreis vorgesehen. Die beiden bipolaren Schalter öffnen und schließen wechselweise. Der in der Wechsel­ stromlast, insbesondere Wechselstrommotor, wirksam werdende Strom wird vom Tastverhältnis des in die Netzzuleitung geschalteten bipolaren Schalters gesteuert.In the invention is preferred in the power supply line to the AC load, in particular AC motor, a fast bipolar switch switched. Parallel to the change Another fast bipolar switch is provided in a freewheeling circuit under current load. The two bipolar switches open and close alternately. The one in the change current load, in particular AC motor, current becomes effective from Duty cycle of the bipolar switch connected to the mains supply is controlled.

In der Freilaufphase, d. h. wenn dieser Schalter öffnet, übernimmt der im Freilaufkreis befindliche zweite schließende bipolare Schalter den Freilaufstrom, der bedingt durch die parasitäre Induktivität der Wechselstromlast bzw. des Wechselstrommotors fließt und führt ihn dem Laststromkreis zu. In the free running phase, i.e. H. when this switch opens, it takes over in the freewheeling circuit located second closing bipolar switch the freewheeling current caused by the Parasitic inductance of the AC load or the AC motor flows and leads it to the load circuit.  

Der resultierende Motorstrom behält seine Sinusinformation bei und läßt sich in seiner 50 Hz-Sinusamplitude regeln. Damit läßt sich auch im Falle eines Wechselstrom- bzw. Drehstrommotors die Motorleistung regeln. Die Anteile der Schaltfrequenz werden durch die Motorinduktivität unterdrückt. Da die gespeicherte Energie über den Freilaufkreis ab­ gebaut und dem Laststromkreis zugeführt wird, erreicht man einen hohen Wirkungsgrad.The resulting motor current maintains its sine information and can be seen in its 50th Control Hz sine amplitude. This means that even in the case of an AC or Three-phase motors regulate the motor power. The proportions of the switching frequency are determined by suppresses the motor inductance. As the stored energy decreases via the freewheeling circuit built and fed to the load circuit, high efficiency is achieved.

Anhand der Figuren wird an einem Ausführungsbeispiel die Erfindung noch näher erläu­ tert. Es zeigt:Based on the figures, the invention is explained in more detail using an exemplary embodiment tert. It shows:

Fig. 1 ein als einphasige Umrichterstufe ausgebildetes Ausführungsbeispiel; und FIG. 1 is designed as a single-phase converter stage embodiment; and

Fig. 2 eine bei der Erfindung erzielte sinusförmige Netzstromaufnahme. Fig. 2 is a sinusoidal power consumption achieved in the invention.

In der Fig. 1 sind Klemmen K1 und K2 für die Zuführung der Versorgungsspannung vor­ gesehen. Als Wechselstromlast ist ein Wechselstrommotor M dargestellt. In der Netzzu­ leitung zum Motor M befindet sich ein schneller bipolarer Schalter 51, beispielsweise ein bipolarer Transistor. Parallel zum Motor M befindet sich in einem Freilaufkreis ein zweiter schneller bipolarer Schalter S2, der ebenfalls als bipolarer Transistor ausgebildet sein kann.In Fig. 1 terminals K1 and K2 are seen before for the supply of the supply voltage. An AC motor M is shown as an AC load. In the Netzzu line to the motor M is a fast bipolar switch 51 , for example a bipolar transistor. Parallel to the motor M there is a second fast bipolar switch S2 in a freewheeling circuit, which can also be designed as a bipolar transistor.

Der Schalter S1 wird mittels geeigneter Pulsweitenmodulation PWM in schneller Folge, z. B. mit 20 kHz, ein- und ausgeschaltet. In der Lastphase fließt in der positiven Halbwelle der Strom von der Klemme K1 über den geschlossenen Schalter S2 und den Wechsel­ strommotor M zur Klemme K2. In der Freilaufphase der positiven Halbwelle (Pause des Tastverhältnisses) ist der Schalter S1 geöffnet und der Schalter S2 im Freilaufkreis ge­ schlossen. Der durch die parasitäre Induktivität des Motors bedingte Reversstrom kann so im Freilaufkreis weiterfließen und dem Laststromkreis zugeführt werden. Diese Ge­ gentaktsteuerung erfolgt mittels einer Steuerschaltung St5/PWM.The switch S1 is switched in rapid succession by means of suitable pulse width modulation PWM, e.g. B. at 20 kHz, on and off. In the load phase flows in the positive half-wave the current from the terminal K1 via the closed switch S2 and the change current motor M to terminal K2. In the free running phase of the positive half wave (pause of the Duty cycle), switch S1 is open and switch S2 in the freewheeling circuit closed. The reverse current caused by the parasitic inductance of the motor can continue to flow in the freewheeling circuit and are fed to the load circuit. This Ge Gen cycle control takes place by means of a control circuit St5 / PWM.

In der negativen Halbwelle ist die Klemme K1 negativ gegenüber der Klemme K2. In der Lastphase fließt der Strom bei geschlossenem Schalter S1 von der Klemme K2 über den Wechselstrommotor M, den geschlossenen Schalter S1 zur Klemme K1. In der Freilauf­ phase ist der Schalter S1 geöffnet und der Schalter S2 im Freilaufkreis geschlossen, so daß, wie schon erläutert, der Freilaufstrom fließen kann.In the negative half-wave, terminal K1 is negative compared to terminal K2. In the When the switch S1 is closed, the current flows from the terminal K2 via the load phase AC motor M, the closed switch S1 to terminal K1. In the freewheel  phase, switch S1 is open and switch S2 in the freewheeling circuit is closed, see above that, as already explained, the freewheeling current can flow.

Wie aus dem jeweiligen Tastverhältnis für die Schalter S1 und S2 in der Fig. 1 zu erse­ hen ist, werden die Schalter S1 und S2 gegenphasig geschaltet. Der resultierende sinus­ förmige Motorstrom mit z. B. 90% Tastverhältnis ist in der Fig. 2 dargestellt.As can be seen from the respective duty cycle for the switches S1 and S2 in FIG. 1, the switches S1 and S2 are switched in phase opposition. The resulting sinusoidal motor current with z. B. 90% duty cycle is shown in FIG. 2.

Auf diese Weise erreicht man wie im Hauptpatent P 44 28 862.1-32 eine verlustarme Sinusstrom-Leistungsregulierung bei blindanteilbehafteten Wechselstromlasten. Ströme an der Last sind in der Amplitude einstellbar und sinusförmig, da der Laststrom dem Si­ nus der Versorgungsspannung folgt. Die Netzstromaufnahme der Last verhält sich im wesentlichen wie ein Ohmscher Widerstand zur Leistungsregelung, ohne daß dessen Nachteile der hohen Verlustleistung in Kauf genommen werden. Es treten keine Ein­ schaltstöße, wie sie durch Last- und Siebelektrolytkondensatoren erzeugt werden, auf.In this way, as in the main patent P 44 28 862.1-32, a low loss is achieved Sinusoidal power regulation for AC loads with reactive components. Currents The amplitude of the load can be adjusted and is sinusoidal, since the load current corresponds to the Si only the supply voltage follows. The mains current consumption of the load is in the essentially like an ohmic resistor for power control without it Disadvantages of the high power loss are accepted. There are no entries switching impulses, such as those generated by load and sieve electrolytic capacitors.

Claims (4)

1. Verfahren zur Versorgung einer induktiven Last mit Wechselstrom, bei dem die Laststromstellung im Pulsbetrieb mit einem einstellbaren Tastverhältnis erfolgt und der sinusförmige Laststrom bei einem Vielfachen seiner Grundfrequenz ge­ schaltet wird und parallel zur Wechselstromlast in wenigstens einem Freilaufzweig die induktive Energie, welche beim Schalten des Laststromes entsteht, gegen­ phasig gesteuert der Wechselstromlast wieder zugeführt wird und der Freilauf­ zweig im Takt des Laststromes halbwellenabhängig und synchron gesteuert wird, nach Patent P 44 28 628.1-32, dadurch gekennzeichnet, daß der Laststrom und der wenigstens eine Freilaufzweig im Gegentakt geschal­ tet werden.1.Procedure for supplying an inductive load with alternating current, in which the load current is set in pulsed mode with an adjustable duty cycle and the sinusoidal load current is switched at a multiple of its basic frequency, and in parallel to the alternating current load in at least one free-wheeling branch, the inductive energy which is generated when the Load current arises, controlled against phase, the AC load is supplied again and the freewheel is controlled in synchronism with the load current in half-wave mode and synchronously, according to patent P 44 28 628.1-32, characterized in that the load current and the at least one freewheel branch are switched in push-pull mode . 2. Wechselstromsteller für eine induktive Last mit einem Laststromschaltmittel, das mit einem einstellbaren Tastverhältnis den sinusförmigen Laststrom bei einem Vielfachen seiner Grundfrequenz schaltet, und wenigstens einem zur Last parallel geschalteten Freilaufzweig, der die beim Schalten entstehende induktive Energie der Last wieder zuführt, zur Durchführung eines Verfahrens nach Anspruch 1, da­ durch gekennzeichnet, daß der Freilaufzweig einen bipolaren Schalter (S2) auf­ weist, der den Freilaufkreis jeweils dann schließt, wenn das Lastschaltmittel (S1) geöffnet ist. 2. AC power controller for an inductive load with a load current switching means, the with an adjustable duty cycle the sinusoidal load current at a Multiples its basic frequency, and at least one parallel to the load switched freewheel branch, the inductive energy generated during switching feeds the load again, to carry out a method according to claim 1, because characterized in that the freewheeling branch opens a bipolar switch (S2) points, which closes the freewheeling circuit when the load switching means (S1) is open.   3. Wechselstromsteller nach Anspruch 1, dadurch gekennzeichnet, daß das Last­ schaltmittel (S1) ein bipolarer Schalter ist.3. AC power controller according to claim 1, characterized in that the load switching means (S1) is a bipolar switch. 4. Wechselstromsteller nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Schaltmittel (S1 und S2) im Laststromkreis und Freilaufzweig über Pulsweitenmo­ dulation geschaltet sind.4. AC power controller according to claim 2 or 3, characterized in that the Switching means (S1 and S2) in the load circuit and free-wheeling branch via pulse width mo dulation are switched.
DE19532377A 1994-08-12 1995-09-01 Supply of AC load especially AC motor Withdrawn DE19532377A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19532377A DE19532377A1 (en) 1994-08-12 1995-09-01 Supply of AC load especially AC motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4428682A DE4428682C2 (en) 1994-08-12 1994-08-12 Process for supplying an inductive load with sinusoidal alternating current and alternating current regulator therefor
DE19532377A DE19532377A1 (en) 1994-08-12 1995-09-01 Supply of AC load especially AC motor

Publications (1)

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DE19532377A1 true DE19532377A1 (en) 1997-03-06

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DE4428682A Expired - Fee Related DE4428682C2 (en) 1994-08-12 1994-08-12 Process for supplying an inductive load with sinusoidal alternating current and alternating current regulator therefor
DE19532377A Withdrawn DE19532377A1 (en) 1994-08-12 1995-09-01 Supply of AC load especially AC motor

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EP1079213A2 (en) * 1999-08-20 2001-02-28 Krohne AG Method of controlling an oscillation driver for Coriolis flowmeter

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DE19612117A1 (en) * 1996-03-27 1997-10-02 Telefunken Microelectron AC voltage regulator circuit arrangement for AC motor control
DE19709264A1 (en) * 1997-03-06 1998-09-10 Hilti Ag Method for reducing repercussions on the course of the current drawn from a network with inductive loads and device for driving motors according to this method
DE19710161C2 (en) * 1997-03-12 2002-04-18 Ascom Energy Systems Gmbh Circuit for continuously variable direct or indirect variation of the direct current and / or alternating current flowing through a consumer operated by a mains direct or alternating voltage or any combination thereof
DE19741655A1 (en) * 1997-03-12 1999-03-25 Ascom Frako Gmbh Circuit for continuously variable direct or indirect variation of the direct current and / or alternating current flowing through a consumer operated by a direct or alternating voltage or any combination thereof
US5838144A (en) * 1997-05-07 1998-11-17 York International Corporation Solid state, reduced voltage motor starter enabling equalized input/output volt-amp ratings
US5923143A (en) * 1998-03-20 1999-07-13 York International Corporation Solid state motor starter with energy recovery
DE19935048A1 (en) * 1999-07-26 2001-02-08 Mulfingen Elektrobau Ebm System for operating an AC load, in particular an AC motor with speed setting
EP1496605A1 (en) * 2003-07-07 2005-01-12 Vacon Oyj Frequency converter and its control method
FI116647B (en) 2004-06-17 2006-01-13 Vacon Oyj Control of the inverter pulse width modulator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1079213A2 (en) * 1999-08-20 2001-02-28 Krohne AG Method of controlling an oscillation driver for Coriolis flowmeter

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Publication number Publication date
DE4428682C2 (en) 1997-01-23
DE4428682A1 (en) 1996-02-15

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