DE3618348A1 - Device for operation of a resistance welding machine, or of another pulsed-power load - Google Patents

Device for operation of a resistance welding machine, or of another pulsed-power load

Info

Publication number
DE3618348A1
DE3618348A1 DE19863618348 DE3618348A DE3618348A1 DE 3618348 A1 DE3618348 A1 DE 3618348A1 DE 19863618348 DE19863618348 DE 19863618348 DE 3618348 A DE3618348 A DE 3618348A DE 3618348 A1 DE3618348 A1 DE 3618348A1
Authority
DE
Germany
Prior art keywords
battery
inverter
invertor
intermediate circuit
welding machine
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.)
Ceased
Application number
DE19863618348
Other languages
German (de)
Inventor
Reinhard Dipl Ing Schwarzenau
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19863618348 priority Critical patent/DE3618348A1/en
Publication of DE3618348A1 publication Critical patent/DE3618348A1/en
Ceased 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
    • 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
    • H02M5/443—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 thyratron or thyristor type requiring extinguishing means
    • H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/4505—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

In the case of a device for operating a resistance welding machine or another pulsed-power load of high power, which loads are supplied via a controllable invertor as control element, it is intended to reduce the reactive volt ampere consumption severely and to reduce the real power consumption comparatively. This is achieved in that a mains-supply converter, having an intermediate circuit with a pulse invertor (5) having two or more phases, is provided as control element, in the case of which an intermediate-circuit battery (3) (which supplies said invertor and is rechargeable) is arranged in parallel with said invertor in the intermediate circuit, in that the battery is charged at a constant charging current which essentially corresponds to the mean value of the load current, and in that the invertor is self-commutated and is pulsed at high frequency (approximately 500 Hz) from the battery. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Einrichtung zum Betrieb einer Widerstandsschweißmaschine oder eines anderen Stoßleistungsverbrauchers. Zweck der Erfindung ist die Ermöglichung des Betriebs einer Widerstands­ schweißmaschine oder eines anderen Stoßleistungsverbrauchers hoher Lei­ stung auch bei sehr schlechten Netzverhältnissen oder bei extrem hohen Anforderungen an die Netzspannungsqualität. Als Einsatzort kommen ins­ besondere mittelständische oder industrielle Fertigungsstätten in struk­ turschwachen Gebieten mit sehr schwacher Netzeinspeisung in Betracht.The invention relates to a device for operating a Resistance welding machine or another surge power consumer. The purpose of the invention is to enable the operation of a resistor welding machine or another surge power consumer with high lei power even with very poor network conditions or with extremely high ones Mains voltage quality requirements. Come into the special medium-sized or industrial production facilities in struk weak areas with very weak grid feed into consideration.

Zweiphasig an das 380-V-Netz angeschlossene Widerstandsschweißmaschinen konventioneller Bauart müssen aufwendig dynamisch kompensiert und ihre Wirklast symmetriert werden. Dafür werden thyristorgesteuerte Kompen­ sations-Anlagen oder nach indirekter Methode arbeitende Kompensations­ und Symmetrieranlagen eingesetzt.Two-phase resistance welding machines connected to the 380 V network conventional designs must be dynamically compensated and their complex Real load can be symmetrized. For this, thyristor-controlled compen systems or compensation methods that work using the indirect method and balancing systems used.

Selbst bei optimaler Kompensation und Symmetrierung wird bei der unter 13. genannten Technik das Netz mit dem Wirklaststoß beaufschlagt. Das führt bei schwacher Netzeinspeisung und großem R/X-Verhältnis der Netz­ impedanz zu nicht tolerierbaren Spannungseinbrüchen.Even with optimal compensation and balancing, the under 13. The technology mentioned applies a load to the network. The leads the grid with weak grid feed-in and high R / X ratio impedance to intolerable voltage drops.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art anzugeben, bei der der Wirkleistungsbedarf vergleichmäßigt und der Blindleistungsbedarf stark reduziert wird.The invention has for its object a device of the beginning specified type in which the active power requirement is evened out and the reactive power requirement is greatly reduced.

Gemäß der Erfindung wird diese Aufgabe durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the Features specified claim 1 solved.

Durch die Einrichtung gemäß der Erfindung treten keine Netzspannungs­ einbrüche im Schweißtakt bzw. Betriebstakt der Last mehr auf. Bei einer höheren Pulsfrequenz, z.B. 500 Hz, die beispielsweise mit GTO-Ventilen leicht erreichbar ist, kann der Schweißtransformator wesentlich ver­ kleinert werden. Durch geringere Leistungspulsation kann die Schweiß­ qualität verbessert werden.No mains voltage occurs through the device according to the invention breaks in the welding cycle or operating cycle of the load more. At a higher pulse frequency, e.g. 500 Hz, for example with GTO valves is easily accessible, the welding transformer can ver be shrunk. Due to lower power pulsation, the sweat quality can be improved.

Die Einrichtung gemäß der Erfindung wird im nachstehend beschriebenen Ausführungsbeispiel an Hand der Zeichnung näher erläutert.The device according to the invention is described below Embodiment explained in more detail with reference to the drawing.

In der Figur ist ein an ein Drehstromnetz angeschlossener Zwischenkreis- Umrichter mit einem Gleichrichter 1 und einem Wechselrichter 5 darge­ stellt. In die Zuleitungen des Gleichrichters zum Wechselrichter sind Glättungsdrosseln 2 eingefügt. Der steuerbare Wechselrichter ist das Stellglied einer Schweißmaschine. Er speist den Schweißtransformator 6. Zur groben Leistungsanpassung verfügt der Schweißtrafo über Anzapfungen. Mit 7 ist das Schweißgut bezeichnet. In den Zwischenkreis ist parallel zum Wechselrichter eine aufladbare Zwischenkreisbatterie 3 geschaltet.In the figure, a DC link converter connected to a three-phase network is shown with a rectifier 1 and an inverter 5 Darge. Smoothing chokes 2 are inserted into the supply lines from the rectifier to the inverter. The controllable inverter is the actuator of a welding machine. It feeds the welding transformer 6 . The welding transformer has taps for rough performance adjustment. The weld metal is designated by 7 . In the intermediate circuit, a rechargeable intermediate circuit battery 3 is connected in parallel to the inverter.

Als Wechselrichter dient ein selbstgeführter Pulswechselrichter, der aus der Batterie mit möglichst hoher Frequenz (ca. 500 Hz) pulst. Die Wechselrichterventile können GTO-Thyristoren oder konventionelle Thyristor-Zellen sein.A self-commutated pulse inverter serves as the inverter pulses from the battery at the highest possible frequency (approx. 500 Hz). The Inverter valves can be GTO thyristors or conventional Be thyristor cells.

An Stelle der Verwendung von Akkumulatoren als Batterie können bei sehr kurzen Einschalt- und langen Pausenzeiten große Elektrolyt-Kondensatoren verwendet werden. Diese sind pflegeleichter. Zur Entlastung der Speicher von den Wechselströmen sind Filter 4 vorgesehen. Instead of using accumulators as batteries, large electrolytic capacitors can be used with very short switch-on times and long pause times. These are easier to care for. Filters 4 are provided to relieve the storage from the alternating currents.

Mit 8 ist eine Einrichtung zur Schweißmaschinensteuerung bezeichnet, mit 9 ein Bedienpult. Ladestrom, Laststrom und Batteriespannung werden von dieser Steuerung überwacht und entsprechend dem Energiebedarf der Last durch Steuerung des Gleich- und Wechselrichters verändert. Vom Bedienpult aus werden die Grobstufen (Anzapfungen am Trafo) eingestellt und das Schweißprogramm vorgewählt. Parallel zur Batterie können auch mehrere Schweißmaschinen mit steuerbaren Wechselrichtern als Stellglieder angeschlossen werden.With 8 a device for welding machine control is designated, with 9 a control panel. Charging current, load current and battery voltage are monitored by this control and changed by controlling the rectifier and inverter according to the energy requirements of the load. The coarse levels (taps on the transformer) are set and the welding program preselected from the control panel. Parallel to the battery, several welding machines with controllable inverters can also be connected as actuators.

Die Wechselrichter können sowohl zweiphasig als auch dreiphasig ausge­ führt sein. Zweiphasigen Wechselrichtern werden Einphasentransformatoren nachgeschaltet und die Schweißung mit Wechselstrom durchgeführt. Drei­ phasige Wechselrichter speisen Drehstrom-Schweißtransformatoren, an die Diodengleichrichter angeschlossen werden, so daß mit Gleichstrom ge­ schweißt wird.The inverters can be either two-phase or three-phase leads. Two-phase inverters become single-phase transformers connected and the welding carried out with alternating current. Three phase inverters feed three-phase welding transformers to which Diode rectifiers are connected so that ge with direct current is welded.

Claims (3)

1. Einrichtung zum Betrieb einer Widerstandsschweißmaschine oder eines anderen Stoßleistungsverbrauchers hoher Leistung, die über einen steuerbaren Wechselrichter als Stellglied gespeist werden,
dadurch gekennzeichnet, daß ein vom Netz gespeister Umrichter mit Zwischenkreis und zwei- oder mehrphasigem Pulswechselrichter (5) als Stellglied vorgesehen ist, bei dem in den Zwischenkreis parallel zum Wechselrichter eine diesen speisende, wiederaufladbare Zwi­ schenkreisbatterie (3) angeordnet ist,
daß die Batterie mit konstantem, im wesentlichen dem Mittelwert des Laststromes entsprechendem Ladestrom aufgeladen wird,
daß der Wechselrichter selbstgeführt ist und aus der Batterie mit hoher Frequenz (ca. 500 Hz) pulst.1. device for operating a resistance welding machine or another high-power surge power consumer, which are fed via a controllable inverter as an actuator,
characterized in that a converter-fed converter with an intermediate circuit and a two-phase or multi-phase pulse inverter ( 5 ) is provided as an actuator, in which a rechargeable intermediate circuit battery ( 3 ) which feeds the latter and is fed in parallel to the inverter is arranged in the intermediate circuit,
that the battery is charged with a constant charging current which corresponds essentially to the mean value of the load current,
that the inverter is self-guided and pulses from the battery at a high frequency (approx. 500 Hz). 2. Einrichtung nach Patentanspruch 1, dadurch gekennzeichnet, daß der Ladestrom, der Laststrom und die Batteriespannung überwacht und entsprechend dem Energiebedarf der Last durch Steuerung des Gleich- und Wechselrichters (1, 5) ver­ ändert werden. 2. Device according to claim 1, characterized in that the charging current, the load current and the battery voltage are monitored and changed according to the energy requirement of the load by controlling the rectifier and inverter ( 1 , 5 ). 3. Einrichtung nach Patentanspruch 1, dadurch gekennzeichnet, daß mehrere Schweißmaschinen oder andere Stoßleistungsverbraucher mit steuerbaren Wechselrichtern als Stell­ glieder vorhanden sind, deren Wechselrichter parallel zur Zwischen­ kreisbatterie (3) geschaltet sind.3. Device according to claim 1, characterized in that several welding machines or other surge power consumers with controllable inverters are available as actuators, the inverters are connected in parallel to the intermediate battery ( 3 ).
DE19863618348 1986-05-31 1986-05-31 Device for operation of a resistance welding machine, or of another pulsed-power load Ceased DE3618348A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863618348 DE3618348A1 (en) 1986-05-31 1986-05-31 Device for operation of a resistance welding machine, or of another pulsed-power load

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863618348 DE3618348A1 (en) 1986-05-31 1986-05-31 Device for operation of a resistance welding machine, or of another pulsed-power load

Publications (1)

Publication Number Publication Date
DE3618348A1 true DE3618348A1 (en) 1987-12-03

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Application Number Title Priority Date Filing Date
DE19863618348 Ceased DE3618348A1 (en) 1986-05-31 1986-05-31 Device for operation of a resistance welding machine, or of another pulsed-power load

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780214A1 (en) * 1998-06-17 1999-12-24 Coupain Molina Et Associes Supply arrangements for electric welding equipment
DE102007011004A1 (en) * 2007-03-05 2008-09-11 Bernhardt Brehm Method for continuous and stable power supply of consumer with inductive or pulse-shaped power consumption, involves determining type and capacity of each user-defined power source

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH598906A5 (en) * 1976-11-10 1978-05-12 Fael Sa Constant current obtd. in resistance seam welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH598906A5 (en) * 1976-11-10 1978-05-12 Fael Sa Constant current obtd. in resistance seam welding

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-Fa.schrift: G.Brauner, O.Gebhardt, Kompensationder Netzrückwirkungen von Widerstandsschweißma- schinen, in: AEG-Sonderdruck zur 13.Sondertagung "Widerstandschweißen", Deutscher Verband für Schweißtechnik e.V. (DVS), Mai 1985, Essen *
DE-Z.: Schweißen und Schneiden 33 (1981) H.8, S.368-371 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780214A1 (en) * 1998-06-17 1999-12-24 Coupain Molina Et Associes Supply arrangements for electric welding equipment
DE102007011004A1 (en) * 2007-03-05 2008-09-11 Bernhardt Brehm Method for continuous and stable power supply of consumer with inductive or pulse-shaped power consumption, involves determining type and capacity of each user-defined power source

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