US5611950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc welding power source
Assignee: Panasonic Holdings Corp
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Filing: 1995-10-27
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Granted: 1997-03-18
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Expires: 2015-10-27
Abstract
Abstract An arc welding power source comprises a pair of rectifiers connected in parallel with each of double star connection three phase rectifying circuits and a capacitor connected in parallel with the entire rectifying circuit without a DC reactor. As a result, the arc welding power source can supply stable welding current having a smooth waveform and enough short circuit current.
Inventors
- 👤 Masamitsu Tochino
- 👤 Norikazu Osaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:58
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; B23K9/1043; H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
An arc welding power source comprising: a welding transformer having a pair of star connection three phase secondary coils, a first welding output terminal made by connecting each neutral point of said pair of star connection three phase secondary coils, a pair of common connecting points, at each of said pair of star connection three phase secondary coils, which connects secondary coils of said star connection three phase secondary coils at an end opposite to said neutral point, a plurality of control rectifiers connected between said neutral point and said common connecting points in series to each of said secondary coils, an interphase reactor connected between said two common connected points, a DC reactor connected to a middle point of said interphase reactor, a second welding output terminal connected to the DC reactor, a capacitor, having two ends, connected at one end to a connecting point between said interphase reactor and said DC reactor and at the other end to said first welding output terminal, and a pair of rectifiers connected between said neutral point and each of said common connecting points.
Claim 2
Dependent Claim
182 words
An arc welding power source comprising: a welding transformer having a pair of star connection three phase secondary coils, a first welding output terminal made by connecting each neutral point of said pair of star connection three phase secondary coils, a pair of common connecting points, at each of said pair of star connection three phase secondary coils, which connects secondary coils of said star connection three phase secondary coils at an end opposite to said neutral point, a plurality of control rectifiers connected between said neutral point and said common connecting points in series to each of said secondary coils, an interphase reactor connected between said two common connected points, a DC reactor connected to a middle point of said interphase reactor, a second welding output terminal connected to the DC reactor, a capacitor, having two ends, connected at one end to a connecting point between said interphase reactor and said DC reactor and at the other end to said first welding output terminal, and a pair of rectifiers connected between said neutral point and each of said common connecting points.
Claim 3
Dependent Claim
20 words
An arc welding power source in accordance with claim 1, wherein a resistor is provided in parallel with the capacitor.
Claim 4
Dependent Claim
21 words
An arc welding power source in accordance with claim 2, wherein a switching means is provided in series to the resistor.
Claim 5
Dependent Claim
186 words
An arc welding power source comprising: a welding transformer having a pair of star connection three phase secondary coils, a first welding output terminal made by connecting each neutral point of said pair of star connection three phase secondary coils, a pair of common connecting points, at each said pair of star connection three phase secondary coils, which connects secondary coils of said star connection three phase secondary coils at an end opposite to said neutral point, a plurality of rectifiers connected between the neutral point and said common connecting points in series to each of said secondary coils, an interphase reactor connected between said two common connecting points, a DC reactor connected to a middle point of said interphase reactor, a second welding output terminal connected to the DC reactor, a capacitor, having two ends, connected at one end to a connection between said interphase reactor and said DC reactor, and at the other end to said first welding output terminal, a pair of rectifiers connected between said neutral point and each of said common connecting points, and a means to control the welding output.
Claim 6
Dependent Claim
186 words
An arc welding power source comprising: a welding transformer having a pair of star connection three phase secondary coils, a first welding output terminal made by connecting each neutral point of said pair of star connection three phase secondary coils, a pair of common connecting points, at each said pair of star connection three phase secondary coils, which connects secondary coils of said star connection three phase secondary coils at an end opposite to said neutral point, a plurality of rectifiers connected between the neutral point and said common connecting points in series to each of said secondary coils, an interphase reactor connected between said two common connecting points, a DC reactor connected to a middle point of said interphase reactor, a second welding output terminal connected to the DC reactor, a capacitor, having two ends, connected at one end to a connection between said interphase reactor and said DC reactor, and at the other end to said first welding output terminal, a pair of rectifiers connected between said neutral point and each of said common connecting points, and a means to control the welding output.
Claim 7
Dependent Claim
20 words
An arc welding power source in accordance with claim 4, wherein a resistor is provided in parallel with the capacitor.
Claim 8
Dependent Claim
21 words
An arc welding power source in accordance with claim 5, wherein a switching means is provided in series to the resistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |