US3809980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase adapter
Assignee: Individual
•
Filing: 1973-02-05
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Granted: 1974-05-07
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Expires: 1993-02-05
Abstract
Abstract A device is disclosed for converting single-phase power to three-phase power. The device includes an autotransformer and a variable impedance device for adjusting the magnitude and phase of the autotransformer output. A first regulator circuit, including comparison, amplifier, phase shifting and SCR stages, is provided to regulate the impedance of the variable impedance device. A second regulator circuit, including comparison, control and power output stages, is also included to provide the device with the capability of compensating for changing power factors in three-phase loads coupled to it.
Inventors
- 👤 F Nottingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:52
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/02; H01; H01F; H01F29/00; H01F29/14; H01F29/143; H01F30/00; H01F30/06; H01F30/12; H01F30/14; H02; H02J; H02J3/00; H02J3/18; H02J3/1885; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/10; H02M5/16; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means said variable impedance means including a saturable core reactor coupled in series with a linear inductor, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand, and second regulator means coupled to said first regulator means for providing said device with load power factor compensation.
Claim 2
Independent Claim
117 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means said variable impedance means including a saturable core reactor coupled in series with a linear inductor, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand, and second regulator means coupled to said first regulator means for providing said device with load power factor compensation.
Claim 3
Dependent Claim
31 words
A device for converting single-phase power to three-phase power as in claim 1, wherein: a first capacitor is coupled in parallel with said series connected saturable core reactor and linear inductor.
Claim 4
Dependent Claim
65 words
A device for converting single-phase power to three-phase power as in claim 1, wherein: said saturable core reactor includes a core having a center leg and two outer legs, a gate winding wound on said center leg, and a pair of control windings wound on said outer legs and connected in series opposition whereby a wide range of reactance variations with rapid response is permitted.
Claim 5
Independent Claim
162 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand and including comparison means for developing an output error signal representing the difference between two input signals, amplifying means and for amplifying said error signal, output means for supplying an output signal, electronic switching means coupled to said output means for controlling said output signal, and phase shifting means coupled to said electronic switching means for controlling the switching phase thereof, and second regulator means coupled to said first regulator means for providing said device with load power factor compensation.
Claim 6
Independent Claim
162 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand and including comparison means for developing an output error signal representing the difference between two input signals, amplifying means and for amplifying said error signal, output means for supplying an output signal, electronic switching means coupled to said output means for controlling said output signal, and phase shifting means coupled to said electronic switching means for controlling the switching phase thereof, and second regulator means coupled to said first regulator means for providing said device with load power factor compensation.
Claim 7
Independent Claim
118 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand, and second regulator means coupled to said first regulator means and including comparison means for developing an output error signal representing the difference between two input signals for providing said device with load power factor compensation.
Claim 8
Independent Claim
118 words
A device for converting single-phase power to three-phase power comprising: input means for coupling said device to a suitable source of single-phase power, transformer means coupled to said input means, variable impedance means coupled to said transformer means for adjusting the phase of output current from said transformer means, first regulator means coupled to said input means and to said variable impedance means for controlling the impedance of said variable impedance means in accordance with the magnitude of the three-phase power demand, and second regulator means coupled to said first regulator means and including comparison means for developing an output error signal representing the difference between two input signals for providing said device with load power factor compensation.
Claim 9
Dependent Claim
38 words
A device for converting single-phase power to three-phase power as in claim 5, wherein: said second regulator means further includes control means comprising a servo motor and output means including a rotatable transformer coupled to said servo motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |