US3781640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc working power supply with saturable reactor current control
Assignee: ESAB AB
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Filing: 1972-08-17
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Granted: 1973-12-25
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Expires: 1992-08-17
Abstract
Abstract An arc working power supply wherein current is controlled by means of a saturable reactor and control circuit which monitors the current to the saturable reactor control winding comparing it to a reference for automatic adjustment. The control circuit includes a slope control for varying the rates of current rise and fall at the beginning and end of the operation.
Inventors
- 👤 T Toth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:52
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
An arc working power supply adapted to be connected in circuit with an electrode and workpiece and including in combination a source of input power, a magnetic control element having a control winding, and a current control circuit for controlling the magnitude of current in said control winding, said current control circuit comprising: a source of alternating current; a full wave bridge rectifier network coupling said source of alternating current to said control winding, said rectifier network including gate means for controlling conduction of said network during each half cycle of alternating current; sensing means for providing an output DC feedback signal responsive to the DC level of current in said control winding; means for generating a DC reference signal which varies linearly between a first and second DC potential at a rate in synchronism with each half cycle of said alternating current; and means for energizing said gate means when the difference between said reference signal and said feedback signal equal a predetermined value.
Claim 2
Dependent Claim
165 words
An arc working power supply adapted to be connected in circuit with an electrode and workpiece and including in combination a source of input power, a magnetic control element having a control winding, and a current control circuit for controlling the magnitude of current in said control winding, said current control circuit comprising: a source of alternating current; a full wave bridge rectifier network coupling said source of alternating current to said control winding, said rectifier network including gate means for controlling conduction of said network during each half cycle of alternating current; sensing means for providing an output DC feedback signal responsive to the DC level of current in said control winding; means for generating a DC reference signal which varies linearly between a first and second DC potential at a rate in synchronism with each half cycle of said alternating current; and means for energizing said gate means when the difference between said reference signal and said feedback signal equal a predetermined value.
Claim 3
Dependent Claim
45 words
An arc working power supply as defined in claim 1 further comprising a slope control circuit including means for integrating said DC reference signal for a first predetermined time period and means for differentiating said DC reference signal for a second predetermined period of time.
Claim 4
Dependent Claim
53 words
An arc working power supply as defined in claim 2 wherein said slope control means comprises a capacitor charging and discharging circuit and includes a first manually variable resistor for controlling the charging time of said capacitor circuit and a second manually variable resistor for controlling the discharge time of said capacitor circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |