US3718802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ripple control for electric arc welding power supply apparatus
Assignee: L-Tec Co
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Filing: 1971-06-30
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Granted: 1973-02-27
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Expires: 1991-06-30
Abstract
Abstract Power supply apparatus for producing a continuous ripple direct current comprising a single phase A.C. source of power, a series connected parallel network consisting of a variable inductor in parallel with a series connected resistor and capacitor, a silicon controlled rectifier interposed between the power source and the parallel network and charging means for charging the capacitor during the positive half-cycle of alternating input current.
Inventors
- 👤 A Manz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:28
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
Power supply apparatus for providing a continuous ripple direct current output to an electrode spaced above a workpiece for performing a welding operation comprising: a single-phase alternating current source of power having an output lead and a return lead, said return lead being adapted to be connected to said workpiece; a silicon controlled rectifier having an anode, cathode, and a control gate, said anode being connected in series with the output lead of said alternating current source of power; a variable inductor having one end connected to said cathode and the opposite end adapted for connection to said electrode, a series coupled resistor and capacitor circuit, one end of said circuit being coupled to said cathode and the other end being connected to said return lead; trigger means for energizing the control gate of said silicon controlled rectifier at a predetermined instant of time during the positive half-cycle of said alternating current source of power, and means comprising a diode connected at one end in common to said anode and at its opposite end to said capacitor for supplying said capacitor with a predetermined amount of charging energy.
Claim 2
Dependent Claim
188 words
Power supply apparatus for providing a continuous ripple direct current output to an electrode spaced above a workpiece for performing a welding operation comprising: a single-phase alternating current source of power having an output lead and a return lead, said return lead being adapted to be connected to said workpiece; a silicon controlled rectifier having an anode, cathode, and a control gate, said anode being connected in series with the output lead of said alternating current source of power; a variable inductor having one end connected to said cathode and the opposite end adapted for connection to said electrode, a series coupled resistor and capacitor circuit, one end of said circuit being coupled to said cathode and the other end being connected to said return lead; trigger means for energizing the control gate of said silicon controlled rectifier at a predetermined instant of time during the positive half-cycle of said alternating current source of power, and means comprising a diode connected at one end in common to said anode and at its opposite end to said capacitor for supplying said capacitor with a predetermined amount of charging energy.
Claim 3
Dependent Claim
39 words
Power supply apparatus as defined in claim 1 wherein said means for supplying charging energy to said capacitor comprises a diode having an anode connected to said alternating current source of power and a cathode coupled to said capacitor.
Claim 4
Dependent Claim
18 words
Power supply apparatus as defined in claim 2 wherein a resistor is connected in series with said diode.
Claim 5
Dependent Claim
26 words
Power supply apparatus as defined in claim 3 wherein the cathode end of said diode is directly connected to the cathode of said silicon controlled rectifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |