US3609200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply
Assignee: Airco Inc
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Filing: 1970-07-23
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Granted: 1971-09-28
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Expires: 1990-07-23
Abstract
Abstract A power supply is described for use with an electron gun employed in an electron beam furnace system. The power supply includes a transformer and a rectifier connecting the secondary of the transformer to the electron beam gun for supplying current thereto. The power supply also includes a semiconductor-switching circuit connected to the primary of the transformer for supplying current to the primary. The switching circuit is controlled by a pulsing circuit, and a trigger circuit is controlled by a pulsing circuit, and a trigger circuit is connected to the pulsing circuit and to means for sensing a rise in current to the electron gun in the presence of an arc. Upon the sensing of such rise in current, the trigger circuit disables the pulsing circuit to thereby render the switching circuit inoperative and cut off current to the electron beam gun.
Inventors
- 👤 Emmett R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:43
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/24; H01J37/241; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A power supply for an electron gun employed in an electron beam furnace system wherein the gun current is susceptible of rising upon the occurrence of an arc, comprising, a transformer, rectifier means for coupling the secondary of said transformer to the electron beam gun, semiconductor-switching means connected to the primary of said transformer and adapted for connection to a source of alternating current, a pulsing circuit connected to said switching circuit for providing pulses thereto for operating said switching means, means for sensing a rise in current to the electron gun due to an arc, and a trigger circuit connecting said sensing means to said pulsing circuit, said trigger circuit being responsive to a sensing of a rise in current to the electron gun due to an arc by said sensing means to disable said pulsing circuit and thereby render said switching means inoperative, said trigger circuit including a time delay circuit for enabling said pulsing circuit after a predetermined time delay to reinitiate operation of said pulsing circuit and resume operation of said switching means.
Claim 2
Dependent Claim
177 words
A power supply for an electron gun employed in an electron beam furnace system wherein the gun current is susceptible of rising upon the occurrence of an arc, comprising, a transformer, rectifier means for coupling the secondary of said transformer to the electron beam gun, semiconductor-switching means connected to the primary of said transformer and adapted for connection to a source of alternating current, a pulsing circuit connected to said switching circuit for providing pulses thereto for operating said switching means, means for sensing a rise in current to the electron gun due to an arc, and a trigger circuit connecting said sensing means to said pulsing circuit, said trigger circuit being responsive to a sensing of a rise in current to the electron gun due to an arc by said sensing means to disable said pulsing circuit and thereby render said switching means inoperative, said trigger circuit including a time delay circuit for enabling said pulsing circuit after a predetermined time delay to reinitiate operation of said pulsing circuit and resume operation of said switching means.
Claim 3
Dependent Claim
31 words
A power supply according to claim 1 wherein said semiconductor-switching means include a plurality of controlled rectifiers, and wherein said pulsing circuit is connected to the gates of said controlled rectifiers.
Claim 4
Dependent Claim
34 words
A power supply according to claim 1 wherein said trigger circuit includes means for shunting operating current from said pulsing circuit when said sensing means senses a rise in current due to an arc.
Claim 5
Dependent Claim
31 words
A power supply according to claim 1 wherein said trigger circuit includes a semiconductor controlled rectifier connected to shunt-operating current from said pulsing circuit when said semiconductor controlled rectifier is conductive.
Claim 6
Dependent Claim
23 words
A power supply according to claim 1 wherein the output frequency of said pulsing circuit is of the order of about 5 kc.
References Cited (Backward Citations)
US3165571A
Cited
US3400207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |