Patent US3840720A successfully refreshed from Google Patents.
US3840720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-phase transformer-rectifier assembly for a welder
Assignee: Individual
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Filing: 1973-03-05
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Granted: 1974-10-08
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Expires: 1993-03-05
Abstract
Abstract A manually operated portable welding head is supplied direct current from a three-phase transformer-rectifier assembly comprising three identical single-phase transformer-rectifier assemblies. Each single-phase transformer-rectifier assembly includes an E-frame transformer core, a primary winding, and a secondary winding. Each of the secondary windings is provided with three terminals electrically connected to that secondary winding at the two ends and the center thereof. These terminals are spatially located substantially immediately adjacent the periphery of the secondary winding to which they are connected to thereby minimize the lengths of the conductors connecting that secondary winding with these terminals. Three diodes are electrically and mechanically connected to each of the terminals connected to the end of a secondary winding. A conductor bus is electrically connected to each of these eighteen diodes at the terminals thereof opposite their connections with the transformer terminals. A second conductor bus is connected with the three center tap terminals. Full-wave rectified three-phase voltage for the operation of the portable welding head is available at these conductor busses.
Inventors
- 👤 E Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:51
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/12; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/068
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
In a manually operated direct current welder having a portable welding head and a three-phase transformer-rectifier assembly comprising theee single-phase transformer-rectifier assemblies comprising first, second, and third terminals electrically connected to the secondary winding respectively at the two ends and the center thereof, said first, second, and third terminals being mechanically attached and electrically connected, without any intervening conductor structure, directly to said secondary winding and said first, second, and third terminals being spatially located substantially immediately adjacent the periphery of the secondary winding, and first and second rectifiers carried by said first, second, and third terminals substantially immediately adjacent the periphery of the secondary winding and electrically and mechanically connected to said terminals to provide full-wave rectified voltage substantially at the periphery of the secondary winding.
Claim 2
Dependent Claim
127 words
In a manually operated direct current welder having a portable welding head and a three-phase transformer-rectifier assembly comprising theee single-phase transformer-rectifier assemblies comprising first, second, and third terminals electrically connected to the secondary winding respectively at the two ends and the center thereof, said first, second, and third terminals being mechanically attached and electrically connected, without any intervening conductor structure, directly to said secondary winding and said first, second, and third terminals being spatially located substantially immediately adjacent the periphery of the secondary winding, and first and second rectifiers carried by said first, second, and third terminals substantially immediately adjacent the periphery of the secondary winding and electrically and mechanically connected to said terminals to provide full-wave rectified voltage substantially at the periphery of the secondary winding.
Claim 3
Dependent Claim
34 words
An improved transformer-rectifier assembly as in claim 1, wherein said first and second rectifiers are carried respectively by said first and second terminals electrically connected to the secondary winding at the two ends thereof.
Claim 4
Dependent Claim
84 words
An improved transformer-rectifier assembly as in claim 2, wherein said third terminal electrically connected to the secondary winding at the center thereof includes a cylindrical portion and wherein said first and second terminals electrically connected to the secondary winding at the two ends thereof include portions comprising symmetrical hemi-cylindrical sections adapted to be concentrically assembled with the cylindrical portion of said third terminal in which assembly each of said first, second, and third terminals is electrically isolated from the other two of said terminals.
Claim 5
Dependent Claim
46 words
An improved transformer-rectifier assembly as in claim 3, including a conductor bus connected to said third terminal electrically connected to be secondary winding at the center thereof and similarly connected to the corresponding terminals of the other two single-phase transformer-rectifier assemblies constituting said three-phase transformer-rectifier assemblies.
Claim 6
Dependent Claim
58 words
An improved transformer-rectifier assembly as in claim 4, including a conductor bus connected to said first and second rectifiers at the ends thereof opposite the connections of said first and second rectifiers with said first and second terminals and similarly connected with the corresponding rectifier terminals of the other two single-phase transformer-rectifier assemblies constituting said three-phase transformer-rectifier assembly.
Claim 7
Dependent Claim
26 words
An improved transformer-rectifier assembly as in claim 5, wherein said conductor busses include terminal posts from which the portable welding head is supplied full-wave rectified voltage.
Claim 8
Dependent Claim
16 words
An improved transformer-rectifier assembly as in claim 6, wherein the secondary winding comprises two single turns.
Claim 9
Dependent Claim
37 words
An improved transformer-rectifier assembly as in claim 7, wherein the primary winding comprises three coils disposed on the transformer core such that each single turn of the secondary winding is sandwiched between coils of the primary winding.
Claim 10
Dependent Claim
15 words
An improved transformer-rectifier assembly as in claim 8, wherein the transformer has an E-frame core.
Claim 11
Dependent Claim
104 words
A welding transformer-rectifier assembly comprising a transformer core, a primary winding, a secondary winding, first and second terminals electrically spaced on said secondary winding, said first and second terminals being mechanically attached and electrically connected, without any intervening conductor structure, directly to said secondary winding and said first and second terminals being spatially located substantIally immediately adjacent the periphery of said secondary winding, and a rectifier carried by one of said first and second terminals substantially immediately adjacent the periphery of the secondary winding and electrically and mechanically connected to that terminal to provide rectified voltage substantially at the periphery of the secondary winding.
Claim 12
Dependent Claim
104 words
A welding transformer-rectifier assembly comprising a transformer core, a primary winding, a secondary winding, first and second terminals electrically spaced on said secondary winding, said first and second terminals being mechanically attached and electrically connected, without any intervening conductor structure, directly to said secondary winding and said first and second terminals being spatially located substantIally immediately adjacent the periphery of said secondary winding, and a rectifier carried by one of said first and second terminals substantially immediately adjacent the periphery of the secondary winding and electrically and mechanically connected to that terminal to provide rectified voltage substantially at the periphery of the secondary winding.
Claim 13
Dependent Claim
60 words
A welding transformer-rectifier assembly as in claim 10, including a third terminal electrically spaced on said secondary winding from said first and second terminals such that said first, second, and third terminals are electrically connected to the secondary winding respectively at the two ends and the center thereof and spatially located substantially immediately adjacent the periphery of the secondary winding.
Claim 14
Dependent Claim
39 words
A welding transformer-rectifier assembly as in claim 11, including a second rectifier wherein said first and second rectifiers are electrically and mechanically connected to said terminals to provide full-wave rectified voltage substantially at the periphery of said secondary winding.
Claim 15
Dependent Claim
34 words
A welding transformer-rectifier assembly as in claim 12, wherein said first and second rectifiers are carried respectively by said first and second terminals electrically connected to said secondary winding at the two ends thereof.
Claim 16
Dependent Claim
21 words
A welding transformer-rectifier assembly as in claim 13, wherein each of said first and second rectifiers comprises a plurality of diodes.
Claim 17
Dependent Claim
84 words
A welding transformer-rectifier assembly as in claim 14, wherein said third terminal electrically connected to said secondary winding at the center thereof includes a cylindrical portion and wherein said first and second terminals electrically connected to the secondary winding at the two ends thereof include portions comprising symmetrical hemi-cylindrical sections adapted to be concentrically assembled with the cylindrical portion of said third terminal in which assembly each of said first, second, and third terminals is electrically isolated from the other two of said terminals.
Claim 18
Dependent Claim
43 words
A welding transformer-rectifier assembly as in claim 15, including a conductor bus connected to said third terminal electrically connected to said secondary winding at the center thereof and adapted to be connected to the corresponding terminal of another substantially identical welding transformerrectifier assembly.
Claim 19
Dependent Claim
47 words
A welding transformer-rectifier assembly as in claim 16, including a conductor bus connected to said diodes at the ends thereof opposite the connections of said diodes with said first and second terminals and adapted to be connected with the corresponding diodes of another substantially identical transformer-rectifier assembly.
Claim 20
Dependent Claim
77 words
A welding transformer-rectifier assembly as in claim 17, wherein said first and second terminals function as heat sinks for said diodes, said transformer core is an E-frame core, said secondary winding comprises two single turns, said primary winding comprises three coils disposed on the transformer core such that each single turn of said secondary winding is sandwiched between two coils of said primary winding, and said first and second terminals function as heat sinks for said diodes.
Claim 21
Dependent Claim
49 words
A welding transformer-rectifier assembly as in claim 14, wherein substantially equal currents are carried by each of the diodes in the pluality of diodes of said first rectifier and wherein substantially equal currents are carried by each of the diodes in the plurality of diodes of said second rectifier.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |