US4533987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply system
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1982-11-09
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Granted: 1985-08-06
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Expires: 2002-11-09
Abstract
Abstract A power supply system is disclosed in which each of the phases of a three phase AC source are rectified and inverted. During inversion high frequency signals are obtained corresponding to the phases of the AC source which are synchronized so that their zero cross points occur at the same time. The high frequency signals are superposed in series to produce an output signal for a load which has a constant power and diminished current distortion.
Inventors
- 👤 Yoshiaki Tomofuji
- 👤 Takayoshi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/285; H02M7/00; H02M7/42; H02M7/44; H02M7/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A power supply system comprising: a source providing three phase AC power at a predetermined frequency, said source having output lines respectively corresponding to each of the phases of said AC power; a plurality of rectifiers connected to respective pairs of said output lines; a plurality of inverters each connected to an output of a respective one of said rectifiers and comprising an oscillation circuit, each said inverter providing by means of said oscillation circuit an oscillating output signal at a predetermined higher frequency than said predetermined frequency, the output signals of all of said inverters being at the same predetermined higher frequency; a control means for operating the oscillation circuits of said inverters, said control means synchronizing the oscillation period of the oscillation circuits of the inverters such that the output signals of said inverters have the same zero cross point timing; means connected to the outputs of said inverters for superposing in series and phase the outputs of said inverters to produce a high frequency power source.
Claim 2
Dependent Claim
169 words
A power supply system comprising: a source providing three phase AC power at a predetermined frequency, said source having output lines respectively corresponding to each of the phases of said AC power; a plurality of rectifiers connected to respective pairs of said output lines; a plurality of inverters each connected to an output of a respective one of said rectifiers and comprising an oscillation circuit, each said inverter providing by means of said oscillation circuit an oscillating output signal at a predetermined higher frequency than said predetermined frequency, the output signals of all of said inverters being at the same predetermined higher frequency; a control means for operating the oscillation circuits of said inverters, said control means synchronizing the oscillation period of the oscillation circuits of the inverters such that the output signals of said inverters have the same zero cross point timing; means connected to the outputs of said inverters for superposing in series and phase the outputs of said inverters to produce a high frequency power source.
Claim 3
Dependent Claim
33 words
A power supply system as in claim 1 further comprising: a rectifying circuit connected to the output of said superposing means; and, a smoothing circuit connected to the output of said rectifying circuit.
References Cited (Backward Citations)
US3614461A
Cited
US3697717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |