Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1995-06-07
1998-01-20
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 98, 363132, H02M 545, H02M 324, H02M 75387
Patent
active
057106967
ABSTRACT:
In accordance with the present invention a power supply for providing an ac/dc output to a load is disclosed. The power supply includes a first source of dc power and an inverter that provides an ac output to the load. A second source of dc power is provided and selectably connects the first and second sources of dc power in series with the load when the output current reverses. In one embodiment the power sources are connected in series with every output current reversal. The first source of dc power is controllable and the magnitude of the dc current is responsive to a current reference signal. A control circuit provides the current reference signal, wherein the current reference signal is pulsed immediately prior to the ac output reversing polarity. The first source of dc power source preferably includes a buck converter that is switched at a variable frequency, depending upon the desired output current. In the event the user selects either an ac or dc electrode negative output a period of electrode positive dc energy is provided at start up to help establish the arc.
REFERENCES:
patent: 3193002 (1965-07-01), Steigerwald et al.
patent: 3300683 (1967-01-01), Weishaar
patent: 3330933 (1967-07-01), Maklary
patent: 3780258 (1973-12-01), Iceland et al.
patent: 3894210 (1975-07-01), Smith et al.
patent: 3999034 (1976-12-01), Barhorst
patent: 4038515 (1977-07-01), Risberg
patent: 4180720 (1979-12-01), Barhorst
patent: 4485293 (1984-11-01), Tabata et al.
patent: 4502104 (1985-02-01), Mitchell
patent: 4577267 (1986-03-01), Juutilainen
patent: 4639844 (1987-01-01), Galio et al.
patent: 4737901 (1988-04-01), Woodward
patent: 4876433 (1989-10-01), Kashima et al.
patent: 4877941 (1989-10-01), Honma et al.
patent: 4884183 (1989-11-01), Sable
patent: 4916380 (1990-04-01), Barroughs
patent: 4963715 (1990-10-01), Tuttle
patent: 5066900 (1991-11-01), Bassett
patent: 5070294 (1991-12-01), Nochi
patent: 5220151 (1993-06-01), Terayama et al.
patent: 5408067 (1995-04-01), Crouse et al.
patent: 5436550 (1995-07-01), Arakawa
patent: 5444356 (1995-08-01), Reynolds et al.
patent: 5615095 (1997-03-01), Reynolds et al.
Welding Handbook, Chapter 3, Gas Tungsten Arc Welding, pp. 74-107, American Welding Society (1991).
Madsen Michael D.
Reynolds Jon O.
Corrigan George R.
Illinois Tool Works Inc.
Vu Bao Q.
Wong Peter S.
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