Electric power conversion systems – Current conversion – With interphase transformer
Patent
1975-12-05
1978-01-31
Shoop, William M.
Electric power conversion systems
Current conversion
With interphase transformer
219130, 363 87, 219 33, H02M 700
Patent
active
040718859
ABSTRACT:
A three phase electric arc welding power supply using SCR rectifiers for output control which has improved output characteristics, fault protection and current and voltage controls. The main power transformer includes two secondaries connected in a double wye with the neutral points supplying power to one of the output terminals a pair of independent inductances are in series, one with each set of secondaries. Increased phaseback of the SCR's may be effected without the use of additional inductance in the output circuit. The fault protection circuit has a time-current trip curve closely approximating the time-current overload curve of the SCR's whereby the minimum size SCR's for a given maximum current output is obtained. The control circuit is fast responding and gives either: constant voltage output; or variable voltage, constant current output with both line voltage compensation and with increase of current when the arc is shorted and the arc voltage drops below a predetermined amount. Improved firing circuits for the main and pilot SCR's are provided.
REFERENCES:
patent: 1760533 (1930-05-01), Whitaker
patent: 1979699 (1934-11-01), Maslin
patent: 2044593 (1936-06-01), Sabbah
patent: 2825022 (1958-02-01), Boyer et al.
patent: 3337769 (1967-08-01), Buchanan
patent: 3416061 (1968-12-01), Rosenberry, Jr.
patent: 3571659 (1971-03-01), Anzai et al.
patent: 3614377 (1971-10-01), Stearns et al.
patent: 3665149 (1972-05-01), Sakabe et al.
patent: 3777113 (1973-12-01), Arikawa et al.
patent: 3862439 (1975-01-01), Coccio
Bilczo Dale Louis
Carroll John Ernest
Golonka Kenneth Anthony
Overman John Arthur
Shoop William M.
The Lincoln Electric Company
LandOfFree
Electric arc welding power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric arc welding power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric arc welding power supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2079910