Patent US5155675A successfully refreshed from Google Patents.
US5155675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling an inverter
Assignee: Mitsubishi Electric Corp
•
Filing: 1990-10-30
•
Granted: 1992-10-13
•
Expires: 2010-10-30
Abstract
Abstract In a method of controlling the output voltage of a three-phase three-level inverter having a plurality of switching elements by pulse width modulation in each of three-pulse and one-pulse modes, the upper limit of the percentage modulation is set to a value equal to or smaller than the maximum percentage modulation determined by the minimum switching element off time to output a three-level voltage as an inverter output voltage in each phase if each of the switching element is turned of and off one time during one inverter output period.
Inventors
- 👤 Takafumi Maruyama
- 👤 Masayoshi Kumano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:24
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/487; H02M7/4837; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08; H02P27/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A method of controlling the output voltage of a three-phase three-level inverter having a plurality of switching elements by pulse width modulation, comprising the steps of: setting an upper limit of a percentage modulation to a value equal to or smaller than a maximum percentage modulation determined by a minimum off time of the switching elements; applying gate signals to the switching elements for turning the switching elements on and off; and outputting a three-level voltage as an inverter output voltage in each phase when each of the switching elements is turned on and off one time during an inverter output period.
Claim 2
Independent Claim
102 words
A method of controlling the output voltage of a three-phase three-level inverter having a plurality of switching elements by pulse width modulation, comprising the steps of: setting an upper limit of a percentage modulation to a value equal to or smaller than a maximum percentage modulation determined by a minimum off time of the switching elements; applying gate signals to the switching elements for turning the switching elements on and off; and outputting a three-level voltage as an inverter output voltage in each phase when each of the switching elements is turned on and off one time during an inverter output period.
Claim 3
Dependent Claim
38 words
A method of controlling the output voltage of a three-phase three-level inverter according to claim 1 further including the step of: controlling the inverter output voltage by pulse width modulation in a three-pulse mode and a one-pulse mode.
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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |