Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1995-06-07
1997-03-25
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 37, 363 95, 363101, 2191304, H02H 7122, B23K 909
Patent
active
056150954
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: 3300683 (1967-01-01), Weishaar
patent: 3330933 (1967-07-01), Maklary
patent: 3894210 (1975-07-01), Smith et al.
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 3999034 (1976-12-01), Barhorst
patent: 4038515 (1977-07-01), Risberg
patent: 4180720 (1979-12-01), Barhorst et al.
patent: 4876433 (1989-10-01), Kashima et al.
patent: 4877941 (1989-10-01), Honma et al.
patent: 4884183 (1989-11-01), Sable
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: 5444356 (1995-08-01), Reynolds et al.
Welding Handbook, Chapter 3, Gas Tungsten Arc Welding, pp. 74-107, American Welding Society (1991).
Madsen Michael D.
Reynolds Jon O.
Berhane Adolf
Corrigan George R.
Illinois Tool Works Inc.
Wong Peter S.
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