US4106089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current power dividing or combining system
Assignee: Garrett Corp
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Filing: 1976-09-10
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Granted: 1978-08-08
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Expires: 1996-09-10
Abstract
Abstract Current transformers are utilized to combine the outputs of two 30° phase shifted inverters to produce a three phase output which is low in fifth and seventh harmonics. The arrangement utilizes transformers having volt-ampere ratings which are very low compared to the power output of the inverters. The circuit may also be used to convert a three phase input to a multi-phase full wave rectified output without reflecting high fifth and seventh harmonics back into the line.
Inventors
- 👤 Paul I. Fettinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:01
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/49
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A transformer of relatively low VA rating for converting an N phase input waveform to an M phase output waveform wherein M is an integer and N is an integer not less than three, said transformer comprising: primary winding means having at least two coils operatively associated with each phase; secondary coil means operatively associated with each phase and having a center connection and end connections; and means for connecting one of said primary winding means coils of a first phase to one of said primary winding means coils of a second phase in series opposition and to said center connection of said secondary coil means of a third phase.
Claim 2
Dependent Claim
110 words
A transformer of relatively low VA rating for converting an N phase input waveform to an M phase output waveform wherein M is an integer and N is an integer not less than three, said transformer comprising: primary winding means having at least two coils operatively associated with each phase; secondary coil means operatively associated with each phase and having a center connection and end connections; and means for connecting one of said primary winding means coils of a first phase to one of said primary winding means coils of a second phase in series opposition and to said center connection of said secondary coil means of a third phase.
Claim 3
Dependent Claim
32 words
A transformer of claim 1 including: means for connecting a load to said end connection of said secondary coil means to establish a predetermined phase relationship between currents at said end connections.
Claim 4
Independent Claim
87 words
A method of dividing a multiphase waveform with a plurality of relatively low VA rated transformers, each transformer having a current sharing winding with outputs and a central input, and at least two auxiliary windings, said method comprising the steps of: generating voltages in said auxiliary windings; passing each phase of said waveform through an auxiliary winding of two of said transformers to the central input of a current sharing winding of a third of said transformers; and producing output waveforms at said current sharing winding outputs.
Claim 5
Independent Claim
87 words
A method of dividing a multiphase waveform with a plurality of relatively low VA rated transformers, each transformer having a current sharing winding with outputs and a central input, and at least two auxiliary windings, said method comprising the steps of: generating voltages in said auxiliary windings; passing each phase of said waveform through an auxiliary winding of two of said transformers to the central input of a current sharing winding of a third of said transformers; and producing output waveforms at said current sharing winding outputs.
Claim 6
Dependent Claim
19 words
The method of claim 3 including the additional step of rectifying said output waveforms for application to a load.
Claim 7
Dependent Claim
73 words
The method of claim 3 including additional transformers having auxiliary and current sharing windings for each of said transformer output waveforms and including the additional steps of: applying each of said transformer output waveforms through an auxiliary winding of two of said additional transformers to the current sharing winding input of an other of said additional transformers for generating output waveforms at the current sharing winding outputs of each of said additional transformers.
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) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |