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US 6,291,798 B1Granted
Electric ARC welder with a plurality of power supplies
AssigneeLincoln Global, Inc.
InventorElliott K. Stava
Life of this patent
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AssigneeLincoln Global, Inc.
InventorElliott K. Stava
Estimating the term…
An electric arc welder comprising a plurality of power supplies connected to a single welding station with a D.C. input for passing an arc welding current across an electrode and workpiece, each of the power supplies including a switching type inverter with an output D.C. current determined by a signal applied to the input of the power supply, a circuit connecting the output D.C. currents in parallel at the input of the welding station, a feedback circuit including a sensor for creating a current signal representing the arc current, a command signal source, and a circuit for creating a master current signal based upon the sensed current signal and the command signal, and a circuit for applying said master current signal to the input of the plurality of power supplies whereby the D.C. current to the D.C. input of the welding station is equally shared by the power supplies.
An electric arc welder comprising plurality of power supplies for creating a D.C. current of a given magnitude controlled by an adjustable command signal for use by a welding station having a D.C. input current and an output to pass an arc welding current between an electrode and workpiece and an arc current sensor, said plurality of power supplies including a first master power supply and at least one slave power supply, said first master power supply and said at least one slave power supply simultaneously providing current to said D.C. input current, said first master power supply including a first high speed switching type inverter having an output transformer and an output rectifier to produce a first D.C. current having a magnitude determined by a master current signal and a first pulse width modulator operated at a high frequency and having a current control voltage input connected to said master current signal, and an error amplifier for creating said master current signal based upon a comparison of said command signal and said sensed arc current, said at least one slave power supply including a second high speed switching type inverter having an output transformer and an output rectifier to produce a second D.C. current having a magnitude determined by said master current signal and a second pulse width modulator operated at a high frequency and having a current control voltage input connected to said master current signal of said master power supply whereby said first and second D.C. currents combine to form at least a portion of said D.C. input current.
A circuit for controlling, in accordance with an adjustable command signal, a plurality of power supplies each operated by the voltage directed to the input of a pulse width modulator and connected to a common welding station having a D.C. input current and an output to pass an arc welding current between an electrode and workpiece and an arc current sensor, said circuit comprises an error amplifier for creating a master current voltage signal based upon a comparison of a command signal and said sensed arc current and a distribution circuit connecting said master current voltage signal to input of the pulse width modulators of said power supplies whereby each power supply provides a proportional D.C. current to said common welding station inversely proportional to the number of power supplies in said plurality.
An electric arc welder comprising a plurality of power supplies connected to a single welding station with a D.C. input for passing an arc welding current across an electrode and workpiece, each of said power supplies including a switching type inverter with an output D.C. current determined by a signal applied to the input of said power supply, a circuit connecting said output D.C. currents in parallel at the input of said welding station, a feedback circuit including a sensor for creating a current signal representing said arc current, a command signal source, and a circuit for creating a master current signal based upon said sensed current signal and said command signal, and a circuit for applying said master current signal to the input of said plurality of power supplies whereby the D.C. current to said D.C. input of said welding station is equally shared by said power supplies.
Dependencies are inferred from the claim text.