US4969079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrective device for inverter output voltage error
Assignee: Mitsubishi Electric Corp
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Filing: 1990-01-30
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Granted: 1990-11-06
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Expires: 2010-01-30
Abstract
Abstract A corrective device for an inverter output voltage error in which a current sensor is connected in series with the output of an inverter, the polarity of current detected by the current sensor is discriminated by a polarity decision current, a value corresponding to an input D.C. voltage is found by a D.C. voltage sensor, a signal with the polarity of the value inverted according to the discriminated result delivered from the polarity decision current is generted by a polarity inverter circuit, and the signal is applied as a correction signal to the PWM (pulse-width modulation) circuit of the inverter so as to correct the output voltage error.
Inventors
- 👤 Mitsuo Kiriyama
- 👤 Joji Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:40
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/539; H02M7/5395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
In a corrective device for an inverter output voltage error wherein the error of an output voltage of an inverter for changing a D.C. voltage into an A.C. voltage, the error being ascribable to a short-circuit preventive period, is controlled; a corrective device for an inverter output voltage error comprising a current sensor which detects an output current of said inverter, polarity decision means for discriminating a polarity of the inverter output current detected by said current sensor, a D.C. voltage sensor which detects a D.C. voltage of said inverter, and a polarity inverter circuit which receives an output of said polarity decision means and an output of said D.C. voltage sensor and by which a signal with a polarity of the output of said D.C. voltage sensor inverted in accordance with the output state of said polarity decision means is supplied as a correction signal to a PWM (pulse-width modulation) circuit of said inverter.
Claim 2
Dependent Claim
155 words
In a corrective device for an inverter output voltage error wherein the error of an output voltage of an inverter for changing a D.C. voltage into an A.C. voltage, the error being ascribable to a short-circuit preventive period, is controlled; a corrective device for an inverter output voltage error comprising a current sensor which detects an output current of said inverter, polarity decision means for discriminating a polarity of the inverter output current detected by said current sensor, a D.C. voltage sensor which detects a D.C. voltage of said inverter, and a polarity inverter circuit which receives an output of said polarity decision means and an output of said D.C. voltage sensor and by which a signal with a polarity of the output of said D.C. voltage sensor inverted in accordance with the output state of said polarity decision means is supplied as a correction signal to a PWM (pulse-width modulation) circuit of said inverter.
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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) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |