CHARGING/STARTING DEVICE FOR WELDING OPERATIONS Russian patent published in 1999 - IPC

FIELD: welding engineering. SUBSTANCE: device has transformer with O-shaped magnetic core whose legs carry primary and secondary transformer windings. Secondary winding is built up of two series-connected parts wound on different legs. Device also has power terminals for DC loads. Transformer primary winding is made of two series-connected parts wound on different legs and connected to power terminals for ac loads and through thyristor regulator, to supply mains. Secondary winding leads are connected to rectifier bridge input and center tap, to additional output terminal for DC loads. Output leads of rectifier bridge are connected to power terminals for loads fed with regulated DC current: its plus lead, to plus terminal and its minus lead, to minus terminal through reactor. Connected in front of reactor to minus lead at rectifier bridge output is minus lead of capacitor whose plus lead is connected to rectifier bridge through selector switch used for alternate connection of capacitor to plus output lead of rectifier bridge and to output power terminal for loads supplied with regulated DC current, or to one of leads at rectifier bridge input. Parts of transformer windings wound on one of legs are selected to have turn ratios of 1/3n₁ and 2/3n₂, those on other leg, 2/3n₁ and 1/3n₂, respectively, where n₁ is total primary turn number and n₂ is total secondary turn number. EFFECT: enlarged functional capabilities and improved performance characteristics of device. 3 dwg