SOURCE OF ELECTRICAL ENERGY FOR A RESISTANCE-WELDING MACHINE

ABSTRACT An electrical power source for resistance welding apparatus is described. It is conventional in such a power source to use a static inverter and a welding transformer and to incorporate a static frequency converter, usually solid state, which derives an output voltage having a frequency and...

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Bibliographic Details
Main Author BELAMARIC, ZELIMIR
Format Patent
LanguageEnglish
French
Published 05.03.1985
Edition3
Subjects
APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS
CLADDING OR PLATING BY SOLDERING OR WELDING
CONTROL OR REGULATION THEREOF
CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
ELECTRICITY
GENERATION
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:ABSTRACT An electrical power source for resistance welding apparatus is described. It is conventional in such a power source to use a static inverter and a welding transformer and to incorporate a static frequency converter, usually solid state, which derives an output voltage having a frequency and pulse shape different from the voltage fed to the inverter. According to the invention, one or more parallel additional frequency converters are provided. The output voltages of all the frequency converters are added in phase synchronism in the primary circuit of the welding transformer. The use of at least two frequency converters permits very steep sided pulses to be obtained thus ensuring accurate weld beginnings and ends. The shape, amplitude and work to space ratio of the pulses can be varied within wide limits.
Bibliography:Application Number: CA19820402770