US4899268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-dependent single-phase to three-phase AC power conversion
Assignee: APC-ONSITE Inc A CORP OF OR
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Filing: 1989-05-10
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Granted: 1990-02-06
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Expires: 2009-05-10
Abstract
Abstract Apparatus for supplying from a single-phase, known-frequency AC source, three-phase AC power at the same frequency. The apparatus features circuitry which employs high-speed power switching with respect to only one phase of a three-phase load, with the result that only two high-speed power-switching devices (transistors) are required.
Inventors
- 👤 Theodore G. Hollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:13
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/10; H02M5/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
Apparatus for supplying to a three-phase electrical load including three input terminals, operating power from a single-phase, known-frequency, sinusoidal power source including two output terminals, said apparatus, in operative condition, comprising means operatively connecting each of a first and second of such input terminals with a different one of such output terminals of the direct supply to the latter of voltage from the former, and electronic means operatively connected both to such two output terminals and to the third input terminal for supplying the latter with a sinusoidal voltage artifact matching the frequency of the source and having an amplitude which is a predetermined absolute value greater than that of the source.
Claim 2
Dependent Claim
112 words
Apparatus for supplying to a three-phase electrical load including three input terminals, operating power from a single-phase, known-frequency, sinusoidal power source including two output terminals, said apparatus, in operative condition, comprising means operatively connecting each of a first and second of such input terminals with a different one of such output terminals of the direct supply to the latter of voltage from the former, and electronic means operatively connected both to such two output terminals and to the third input terminal for supplying the latter with a sinusoidal voltage artifact matching the frequency of the source and having an amplitude which is a predetermined absolute value greater than that of the source.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein said electronic means includes algorithm-controlled computer means.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2, wherein said electronic means further includes no more than two electronic power switches operatively connected to and controlled by said computer means.
Claim 5
Independent Claim
15 words
The apparatus of claims 1, 2 or 3, wherein such absolute value equals substantially 1.73.
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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |