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WO1997001211A1 - Convertisseurs de charge resonnants - Google Patents

Convertisseurs de charge resonnants Download PDF

Info

Publication number
WO1997001211A1
WO1997001211A1 PCT/GB1996/001498 GB9601498W WO9701211A1 WO 1997001211 A1 WO1997001211 A1 WO 1997001211A1 GB 9601498 W GB9601498 W GB 9601498W WO 9701211 A1 WO9701211 A1 WO 9701211A1
Authority
WO
WIPO (PCT)
Prior art keywords
resonant
resonant circuit
circuit
frequency
load
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
PCT/GB1996/001498
Other languages
English (en)
Inventor
Helen Phyllis Geraldine Pollock
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.)
University of Warwick
Original Assignee
University of Warwick
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 University of Warwick filed Critical University of Warwick
Priority to AU62329/96A priority Critical patent/AU6232996A/en
Publication of WO1997001211A1 publication Critical patent/WO1997001211A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1006—Power supply
    • B23K9/1043—Power supply characterised by the electric circuit
    • B23K9/1056—Power supply characterised by the electric circuit by using digital means
    • B23K9/1062—Power supply characterised by the electric circuit by using digital means with computing means
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/01—Resonant DC/DC converters
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • This invention relates to load resonant converters, and is concerned more
  • the workpiece forms part of the electrical circuit and must therefore be isolated from the circuit by means of an isolation transformer for safety reasons.
  • induction heating power supplies can also be improved by high frequency operation
  • Series-parallel load resonant converters have been developed for such an application as they can operate at high switching frequencies and since they include resonant components connected both in series and in parallel with the load which limit
  • load leg inductance can arise from the leakage inductance of an isolation transformer
  • the inductance of the load an additional inductor, or any combination of these.
  • the current through the series leg and hence through the switching devices naturally commutates to zero, and can be controlled so that this is the point of switching. This enables the converter to operate at high frequency without exceeding the thermal rating of the switching devices.
  • PWM pulse width modulation
  • phase control Another known method of controlling such a converter is by a frequency control technique (also referred to as phase control) in which the power output is varied by moving the operation of the resonant circuit away from resonance, as described in
  • a further control method involves deadtime control of a half-bridge
  • each switching device is turned on, as described in "Current pulse control of high
  • control means for controlling the resonant circuit so as to provide an
  • a resonant frequency of the resonant circuit occurs when the applied voltage
  • Such a load resonant converter may be controlled to operate at two or more
  • load resonant converter may be controlled to operate at
  • a predetermined acceptable range when connected to a variable load by switching the operating frequency of the circuit between two or more resonant frequency values in dependence on the load voltage.
  • the voltage across the capacitor increases from substantially zero to a maximum
  • the output power level may be maintained within an acceptable range
  • than one resonant frequency is that there should be more than one current path through
  • the load can be placed in any leg of the circuit. If it is in a
  • the load may be any energy conversion device which serves to dissipate
  • the load may be a
  • welding arc which may be considered as an e.m.f. in series with a resistance and which serves to dissipate electrical energy in the form of heat.
  • Figures 1 and 2 are circuit diagrams of full bridge and half bridge series parallel load resonant converters
  • Figure 3 is a plot of the magnitude and phase of admittance against
  • Figure 4 is a plot of the switch current and voltage of such a load resonant converter in accordance with the invention at two different power levels;
  • Figure 5(a) is a block diagram showing a control arrangement of a load
  • Figure 5(b) is a block diagram of a another control arrangement of a load
  • Figure 6 is a circuit diagram of a further load resonant converter in
  • Figure 7 is a plot of the range of power levels achievable with the load
  • the full bridge resonant converter 1 of Figure 1 comprises four power
  • switching devices S I , S2, S3 and S4 each of which is shown as an insulated gate bipolar transistor (IGBT), and four freewheeling diodes Dl , D2, D3 and D4 connected
  • a resonant circuit 3 comprising a series leg consisting of an inductance Ls and a capacitance C s , a parallel leg consisting of an inductance L p and
  • Figure 2 shows a half bridge resonant converter 10 comprising only two
  • circuit 10 can be chosen so that the circuit has two or more resonant frequencies and so that
  • the circuit delivers a different level of power to the load at each resonant frequency for
  • a resonant frequency of the circuit occurs when the applied
  • ⁇ is the resonant frequency and k,, k,, and k. are coefficients determined by the
  • Figure 4 shows the switch current and voltage of the converter initially during full power operation with the circuit operating at one resonant frequency
  • Figure 5a shows the simplest control arrangement.
  • controller 5 incorporates a clock generator 101 for each of the resonant frequencies of
  • a power selector 102 determines which clock generator signal is
  • a delay compensation block 103 is selected for the control of the resonant converter.
  • Figure 5b shows an altemative control arrangement which controls the circuit at various power levels with the capability of maintaining resonant operation when there is variation in the load at any power level.
  • the controller 5 the controller 5
  • a current sensor 11 such as a Hall effect device, which senses the current
  • a phase-locked loop 13 inco ⁇ orates
  • a divider 14 serving to produce a signal having a frequency which is 64 times the
  • controller 16 which is advanced to take account of delays in the gate drives 17 for
  • the digital controller 16 includes a clock generator at each of the resonant
  • tlie converter may be operated at a reduced power
  • the full power level may be used for welding.
  • Such a converter is therefore capable of providing power at substantially
  • Figure 6 shows a further resonant converter 20 in accordance with the
  • the active rectifier circuit 21 consists of an
  • the load is isolated from the resonant circuit by means of the isolation transformer 24.
  • the workpiece forms part of the electrical circuit and must be isolated from the power
  • the transformer is reduced in size significantly with high
  • the leakage inductance of the transformer forms part of the
  • the transformer can have a different number of turns on the primary
  • bridge diode rectifier 25 so as to provide a direct current in the load at each power
  • the rectifier or any other means of rectifying the load current can be connected
  • isolation transformer if isolation of the load is not required.
  • Figure 7 shows the range of power achievable using such a resonant
  • the converter may be controlled so as to vary the frequency of operation within a small frequency range to allow fine control of the power level.
  • resonant converters may also be used for supplying power to a variable voltage load
  • the resonant converter of Figure 6 may be used for
  • rectifier circuit 21 and the isolation transformer 24 are not essential where a capacitor is to be charged.
  • the isolation transformer 24 is not essential where a capacitor is to be charged.
  • the resonant frequency of the resonant circuit can be controlled so as to allow the
  • the capacitor is initially charged with the
  • the circuit is caused to resonate at a third resonant
  • control of the resonant circuit is such as to provide an appropriate impedance transformation between the load

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Un convertisseur (1) de charge résonnant comprend un circuit (3) à résonance comprenant une pluralité de fréquence de résonance lorsqu'il est connecté à une charge RCHARGE et des résistances apparentes différentes à au moins deux de ses fréquences de résonance, ainsi qu'un dispositif de commande (5) qui sert à commander le circuit (3) à résonance de manière à produire deux sorties correspondant respectivement à des première et deuxième transformations d'impédance lorsque le circuit (3) à résonance est mis en résonance respectivement à des première et deuxième fréquences de résonance. Un convertisseur (1) de charge résonnant de ce type peut être commandé de manière à produire au moins deux niveaux de puissance de sortie, ou bien de manière à produire des niveaux de puissance de sortie situés dans une plage acceptable prédéterminée lorsqu'il est connecté à une charge variable, et ce au moyen de la commutation de la fréquence de service du circuit entre deux ou plusieurs valeurs de fréquence de résonance en fonction de la tension de la charge.
PCT/GB1996/001498 1995-06-23 1996-06-19 Convertisseurs de charge resonnants Ceased WO1997001211A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62329/96A AU6232996A (en) 1995-06-23 1996-06-19 Load resonant converters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9512806.2 1995-06-23
GBGB9512806.2A GB9512806D0 (en) 1995-06-23 1995-06-23 Load resonant converters

Publications (1)

Publication Number Publication Date
WO1997001211A1 true WO1997001211A1 (fr) 1997-01-09

Family

ID=10776553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/001498 Ceased WO1997001211A1 (fr) 1995-06-23 1996-06-19 Convertisseurs de charge resonnants

Country Status (3)

Country Link
AU (1) AU6232996A (fr)
GB (1) GB9512806D0 (fr)
WO (1) WO1997001211A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0881759A3 (fr) * 1997-05-30 2000-06-21 Delco Electronics Corporation Convertisseur résonant série sub-résonant avec facteur de forme amélioré et interférence électromagnétique reduite
WO2000076056A1 (fr) * 1999-06-03 2000-12-14 Cheltenham Induction Heating Limited Alimentation
WO2001003874A1 (fr) * 1999-07-13 2001-01-18 Selco S.R.L. Generateur pour machines a souder a l'arc
WO2001053030A1 (fr) * 2000-01-20 2001-07-26 Fronius International Gmbh Procede pour la regulation et/ou la commande d'une source de courant de soudage grace a un circuit a resonance
WO2001089754A3 (fr) * 2000-05-22 2002-04-25 Selco Srl Transformateur de soudure a l'arc a etage d'adaptation de la tension d'entree
EP1364737A1 (fr) * 2002-05-22 2003-11-26 Metabowerke GmbH Source de courant pour le soudage à l'arc
WO2009102382A1 (fr) * 2008-02-13 2009-08-20 Illinois Tool Works Inc. Procédé et système de réduction de courant ondulé de condensateur de machine à souder à tension constante
EP2209197A1 (fr) * 2009-01-16 2010-07-21 Whirpool Corporation Procédé de contrôle de convertisseurs de puissance résonants dans des systèmes de chauffage par induction et système de chauffage par induction pour réaliser ledit procédé
WO2013068816A1 (fr) * 2011-11-08 2013-05-16 Lincoln Global, Inc. Alimentation de soudage à surveillance des performances de conversion
DE102013109827A1 (de) 2013-09-09 2015-03-12 Lorch Schweißtechnik GmbH Verfahren zum Minimieren der durch eine Schweißstromquelle hervorgerufenen Oberwellenbelastung und Schweißstromquelle zur Durchführung des Verfahrens
US9108263B2 (en) 2007-04-30 2015-08-18 Illinois Tool Works Inc. Welding power source with automatic variable high frequency
DE102014104639A1 (de) * 2014-04-02 2015-10-08 Lorch Schweißtechnik GmbH Verfahren zum Regeln einer Schweißstromquelle
WO2019091934A1 (fr) * 2017-11-08 2019-05-16 Fronius International Gmbh Procédé d'amorçage sans contact d'un arc électrique et source de courant de soudage permettant la mise en œuvre d'un procédé d'amorçage
CN111745264A (zh) * 2019-03-29 2020-10-09 林肯环球股份有限公司 电弧焊接电路的实时电阻监测

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231756A1 (fr) * 1986-01-08 1987-08-12 Alsthom Onduleur à double résonance
US4935857A (en) * 1989-08-22 1990-06-19 Sundstrand Corporation Transistor conduction-angle control for a series-parallel resonant converter
GB2284077A (en) * 1993-11-12 1995-05-24 Johan Christiaan Fitter Control of a power converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0231756A1 (fr) * 1986-01-08 1987-08-12 Alsthom Onduleur à double résonance
US4935857A (en) * 1989-08-22 1990-06-19 Sundstrand Corporation Transistor conduction-angle control for a series-parallel resonant converter
GB2284077A (en) * 1993-11-12 1995-05-24 Johan Christiaan Fitter Control of a power converter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NISHIDA A ET AL: "CONTROL CHARACTERISTICS OF SERIES RESONANT CONVERTER WITH PARALLEL RESONANT CIRCUIT UNDER PARALLEL RESONANT FREQUENCY", IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E77-B, no. 12, 1 December 1994 (1994-12-01), pages 1607 - 1613, XP000498077 *

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0881759A3 (fr) * 1997-05-30 2000-06-21 Delco Electronics Corporation Convertisseur résonant série sub-résonant avec facteur de forme amélioré et interférence électromagnétique reduite
WO2000076056A1 (fr) * 1999-06-03 2000-12-14 Cheltenham Induction Heating Limited Alimentation
WO2001003874A1 (fr) * 1999-07-13 2001-01-18 Selco S.R.L. Generateur pour machines a souder a l'arc
CZ301980B6 (cs) * 1999-07-13 2010-08-25 Selco S. R. L. Generátor pro obloukové svárecky
AU770162B2 (en) * 1999-07-13 2004-02-12 Selco S.R.L. Generator for arc welding machines
US6570128B1 (en) 1999-07-13 2003-05-27 Selco S.R.L. Generator for arc welding machines
JP2003532356A (ja) * 2000-01-20 2003-10-28 フロニウス インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング 共振回路を備えた溶接用電源を調整および／または制御する方法
US6849828B2 (en) 2000-01-20 2005-02-01 Fronius International Gmbh Method for regulating and/or controlling a welding current source with a resonance circuit
AT412388B (de) * 2000-01-20 2005-02-25 Fronius Schweissmasch Prod Verfahren zum regeln einer schweissstromquelle mit einem resonanzkreis
WO2001053030A1 (fr) * 2000-01-20 2001-07-26 Fronius International Gmbh Procede pour la regulation et/ou la commande d'une source de courant de soudage grace a un circuit a resonance
WO2001089754A3 (fr) * 2000-05-22 2002-04-25 Selco Srl Transformateur de soudure a l'arc a etage d'adaptation de la tension d'entree
US6593546B2 (en) 2000-05-22 2003-07-15 Selco S.R.L. Arc welding generator with input voltage adapting regulator stage
EP1364737A1 (fr) * 2002-05-22 2003-11-26 Metabowerke GmbH Source de courant pour le soudage à l'arc
US9108263B2 (en) 2007-04-30 2015-08-18 Illinois Tool Works Inc. Welding power source with automatic variable high frequency
US8824175B2 (en) 2008-02-13 2014-09-02 Illinois Tool Works Inc. Constant voltage welder capacitor ripple current reduction method and system
WO2009102382A1 (fr) * 2008-02-13 2009-08-20 Illinois Tool Works Inc. Procédé et système de réduction de courant ondulé de condensateur de machine à souder à tension constante
EP2209197A1 (fr) * 2009-01-16 2010-07-21 Whirpool Corporation Procédé de contrôle de convertisseurs de puissance résonants dans des systèmes de chauffage par induction et système de chauffage par induction pour réaliser ledit procédé
WO2013068816A1 (fr) * 2011-11-08 2013-05-16 Lincoln Global, Inc. Alimentation de soudage à surveillance des performances de conversion
US10857613B2 (en) 2011-11-08 2020-12-08 Lincoln Global, Inc. System and method for real-time computation and reporting of welding machine performance and metrics
US9839967B2 (en) 2011-11-08 2017-12-12 Lincoln Global, Inc. System and method for real-time computation and reporting of welding machine performance and metrics
DE102013109827C5 (de) * 2013-09-09 2017-10-19 Lorch Schweißtechnik GmbH Verfahren zum Minimieren der durch eine Schweißstromquelle hervorgerufenen Oberwellenbelastung und Schweißstromquelle zur Durchführung des Verfahrens
DE102013109827B4 (de) 2013-09-09 2015-04-16 Lorch Schweißtechnik GmbH Verfahren zum Minimieren der durch eine Schweißstromquelle hervorgerufenen Oberwellenbelastung und Schweißstromquelle zur Durchführung des Verfahrens
DE102013109827A1 (de) 2013-09-09 2015-03-12 Lorch Schweißtechnik GmbH Verfahren zum Minimieren der durch eine Schweißstromquelle hervorgerufenen Oberwellenbelastung und Schweißstromquelle zur Durchführung des Verfahrens
DE102014104639A1 (de) * 2014-04-02 2015-10-08 Lorch Schweißtechnik GmbH Verfahren zum Regeln einer Schweißstromquelle
EP2942142A3 (fr) * 2014-04-02 2015-12-09 Lorch Schweisstechnik GmbH Procédé de réglage d'une source de courant de soudage
DE102014104639B4 (de) * 2014-04-02 2015-11-19 Lorch Schweißtechnik GmbH Verfahren zum Regeln einer Schweißstromquelle
WO2019091934A1 (fr) * 2017-11-08 2019-05-16 Fronius International Gmbh Procédé d'amorçage sans contact d'un arc électrique et source de courant de soudage permettant la mise en œuvre d'un procédé d'amorçage
CN111344097A (zh) * 2017-11-08 2020-06-26 弗罗纽斯国际有限公司 电弧的无接触点火方法和用于执行点火工艺的焊接电流源
US11633800B2 (en) 2017-11-08 2023-04-25 Fronius International Gmbh Method for contactlessly striking an arc and welding current source for carrying out a striking process
CN111745264A (zh) * 2019-03-29 2020-10-09 林肯环球股份有限公司 电弧焊接电路的实时电阻监测
CN111745264B (zh) * 2019-03-29 2024-05-10 林肯环球股份有限公司 电弧焊接电路的实时电阻监测

Also Published As

Publication number Publication date
AU6232996A (en) 1997-01-22
GB9512806D0 (en) 1995-08-23

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