Two-phase transformer and welding circuit therefor

Details Two-phase transformer and welding circuit therefor Two-phase transformer and welding circuit therefor

1980-10-31

1983-11-15

Paschall, M. H.

Electric heating

Metal heating

For bonding with pressure

219108, 2191301, 357 68, 357 71, 174117F, 174120R, B23K 1124

Patent

active

RE0314447

ABSTRACT:
An apparatus for converting three-phase electrical energy into direct current includes Scott-connected transformers with oppositely biased SCRs connected in parallel to two of three input terminals. The SCRs are controlled so that they fire in alternate and rotating sequence between the two input terminals. The secondary output voltages of four terminals are rectified so that the common rectified output voltage is a substantially DC voltage with a minimum ripple. The secondary output terminals are aligned in a common plane and are connected to deformable, tapered leads. The rectifiers are connected between the deformable leads and to a common slotted, conductive plate which is connected to a welding electrode. A center tap from each of the secondary windings is connected to another welding electrode. The deformable tapered leads and the slotted conductive plate provide an equal resistive path for pairs of rectifiers for each secondary output to equalize the current flow through the two sets of diodes.

REFERENCES:
patent: 2200776 (1940-05-01), Hoover
patent: 2634396 (1953-04-01), Solomon
patent: 3412294 (1968-11-01), Sciaky
patent: 3460022 (1969-08-01), Riley
patent: 3495067 (1970-02-01), Sciaky
patent: 3735089 (1973-05-01), Sciaky
patent: 3840720 (1974-10-01), Wolf
I.B.M. disclosure, "AC to DC", vol. 6, #3, Aug. 1963, pp. 45-46.

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