Electric heating – Metal heating – By arc
Patent
1998-07-29
2000-04-18
Paschall, Mark
Electric heating
Metal heating
By arc
21912145, 21912157, B23K 1000
Patent
active
060518049
ABSTRACT:
A power supply, such as a plasma cutting power supply or a welding power supply, that provides an output to a pair of output terminals is disclosed. The power supply includes a source of voltage and a plurality of choppers. The choppers are connected in parallel between the voltage source output terminals. A controller controls the choppers so that they are out-of-phase with respect to each of the other of the plurality of choppers. The choppers preferably include a freewheeling diode, an inductor and a switch. The number of choppers is approximately equal to the ratio of the open circuit voltage to the output load voltage.
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Li Stephen H.
Reynolds Jon O.
Schneider Joseph C.
Corrigan George R.
Illinois Tool Works Inc.
Paschall Mark
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