US5091842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for removing d.c. components from output of multi-phase inverter
Assignee: Mitsubishi Electric Corp
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Filing: 1990-04-26
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Granted: 1992-02-25
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Expires: 2010-04-26
Abstract
Abstract A device for removing D.C. components from output voltages of a multi-phase inverter which converts a D.C. voltage into first to N-th phases of A.C. voltages comprises first to (N-1)th detectors connected between the first-phase output line of the multi-phase inverter and the second- to N-th-phase output lines of the multi-phase inverter, respectively. The device also comprises controllers for respectively controlling the second- to N-th-phase output voltages of the inverter in such a manner that the D.C. components detected by the first to (N-1)th detectors are nullified.
Inventors
- 👤 Joji Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:08
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875; H02M7/4803
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A device for removing D.C. components from output voltages of a multi-phase inverter which converts a D.C. voltage into first to N-th phases of A.C. voltage, comprising: first to (N-1)th detectors connected between the first-phase output line of said multi-phase inverter and the second- to N-th-phase output lines of said multi-phase inverter, respectively; and control means for respectively controlling the second- to N-th-phase output voltages of said inverter in such a manner that the D.C. components detected by said first to (N-1)th detectors are nullified.
Claim 2
Independent Claim
85 words
A device for removing D.C. components from output voltages of a multi-phase inverter which converts a D.C. voltage into first to N-th phases of A.C. voltage, comprising: first to (N-1)th detectors connected between the first-phase output line of said multi-phase inverter and the second- to N-th-phase output lines of said multi-phase inverter, respectively; and control means for respectively controlling the second- to N-th-phase output voltages of said inverter in such a manner that the D.C. components detected by said first to (N-1)th detectors are nullified.
Claim 3
Dependent Claim
28 words
A device according to claim 1, wherein said control means include first to (N-1)th integrators for integrating, respectively, the D.C. components detected by said first to (N-1)th detectors.
Claim 4
Dependent Claim
13 words
A device according to claim 1, wherein said detectors incorporate insulated differential amplifiers.
Claim 5
Dependent Claim
23 words
A device according to claim 1, further comprising first to N-th sine wave generators connected to said first to N-th control circuits respectively.
Claim 6
Independent Claim
129 words
A device for removing D.C. components from output voltages of a multi-phase invertor which converts a D.C. voltage into first to N-th phases of A.C. voltage, comprising: a phase voltage detector connected to first to N-th phase output lines of the multi-phase invertor; first to (N-1)th D.C. voltage detectors connected between the first phase output line of said multi-phase invertor and the second to N-th phase output lines of said multi-phase invertor, respectively; first to N-th control circuits connected to said phase voltage detector, each control circuit including a controller for amplifying an input signal and a wave generating circuit both connected to a comparator which is connected to the invertor through a number of drivers; and first to (N-1)th integrators connected to said second to N-th control circuits.
Claim 7
Independent Claim
129 words
A device for removing D.C. components from output voltages of a multi-phase invertor which converts a D.C. voltage into first to N-th phases of A.C. voltage, comprising: a phase voltage detector connected to first to N-th phase output lines of the multi-phase invertor; first to (N-1)th D.C. voltage detectors connected between the first phase output line of said multi-phase invertor and the second to N-th phase output lines of said multi-phase invertor, respectively; first to N-th control circuits connected to said phase voltage detector, each control circuit including a controller for amplifying an input signal and a wave generating circuit both connected to a comparator which is connected to the invertor through a number of drivers; and first to (N-1)th integrators connected to said second to N-th control circuits.
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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) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |