Constant current welding power supply with an upslope starting c

Details Constant current welding power supply with an upslope starting c Constant current welding power supply with an upslope starting c

1979-07-12

1981-08-04

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 49, 363129, 21913031, 2191305, H02M 7155, B23K 906

Patent

active

042825695

ABSTRACT:
A constant current welding power supply having a single transformer with a primary winding connected to a three phase input source of line voltage and two secondary windings each having a bridge rectifier for providing an open circuit starting voltage separate from the arc working voltage. Each bridge rectifier is fired by separate firing means controlled by a logic control means. One bridge rectifier is energized with an advancing firing angle proportional to a ramp output signal enabled through the control means in response to a predetermined drop in output voltage. The other bridge rectifier is energized in synchronism with the line voltage for a predetermined period of time following the predetermined drop in output voltage.

REFERENCES:
patent: Re29441 (1977-10-01), Ericsson
patent: 3530359 (1970-09-01), Grist
patent: 3688180 (1972-08-01), Chiasson et al.
patent: 3781640 (1973-12-01), Toth

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