A welding power supply including power conversion circuitry adapted to receive a primary source of power, to utilize one or more power semiconductor switches to chop the primary source of power, and to convert the chopped power to a welding output is provided. The provided welding power supply includes a pulse width modulated (PWM) digital controller including gate drive circuitry that generates a PWM output signal that controls the switching of the one or more power semiconductor switches. The PWM output signal includes a duty cycle term corrected for one or more sources of error in the welding system.

Claims

12 · 1 independent · depth 3

12 granted claims

›1.independentA welding power supply, comprising:npower conversion circuitry comprising one or more power semiconductor switches, wherein the power conversion circu…+11

›2.↳ 1The welding power supply of claim 1, wherein the duty cycle term is calculated by computing an integral term configured to correct for the steady stat…d2+3

›6.↳ 1The welding power supply of claim 1, wherein the PWM controller is configured to limit the duty cycle term to at least one of a preset minimum value a…d2

›7.↳ 1The welding power supply of claim 1, wherein the power conversion circuitry comprises an inverter-type power supply that comprises at least one of a f…d2

›8.↳ 1The welding power supply of claim 1, wherein the one or more analog signals comprise the commanded current level.d2

›9.↳ 1The welding power supply of claim 1, wherein the one or more analog signals comprise a current feedback signal.d2

›10.↳ 1The welding power supply of claim 1, wherein the one or more analog signals comprise a voltage feedback signal.d2

›11.↳ 1The welding power supply of claim 1, wherein the duty cycle term is corrected for a gate drive delay associated with the one or more power semiconduct…d2

›12.↳ 1The welding power supply of claim 1, wherein the duty cycle term is corrected for a current-dependent or power-dependent loss comprising at least one …d2

Classifications

10 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B23K9/095
B23K9/10

USPC · US Patent Classification

219/130.21219/13.PS219/130.33219/130.5219/115219/110219/130.51219/130.35

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Pendency

0.6 y

211 days filing → grant

Office actions

after a restriction

Examiner

Viet Q Nguyen

art unit 2827 · TC 2800

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Citations: 53 back · 0 forward

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Priority chain

2 priority documents

Priority

3 Jun 2009

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 61183731	3 Jun 2009
related publication	US 20140158670 A1	12 Jun 2014

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