US5034876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Real-time evaluation of PWM inverter pattern selection
Assignee: Sundstrand Corp
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Filing: 1990-09-10
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Granted: 1991-07-23
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Expires: 2010-09-10
Abstract
Abstract A pulse-width-modulated inverter models the output response of the system for a given switching angle set under existent load and d.c. link conditions. Before implementation, a provisionally selected angle set is input to the model, which produces an output representative of system operation for the provisional selected set. The harmonics content of the model output is compared with criteria establishing maximally allowable amplitudes for the harmonics and the set is implemented only if the output meets the criteria.
Inventors
- 👤 Maurice A. Kirchberg, Jr.
- 👤 Alexander Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:48
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; H02M7/529
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
In an aircraft power supply system in which an inverter is used to generate an a.c. power output from a d.c. link voltage, an inverter controller comprising in combination; means to provisionally select a set of pulse-width-modulating switching angles in response to an a.c. power output parameter; means to simulate the operation of said inverter in response to inputs of said d.c. link voltage, said a.c. output parameter, and said pulse-width-modulating switching angles, said means to simulate providing an a.c. output signal whose wave form simulates an output of said inverter in response to said inputs; means to couple said inputs to said means to simulate; means to analyze said a.c. output signal to determine the amplitude of any harmonic distortion of said a.c. output signal for at least one harmonic of interest; means coupled to said analyzing means to test the amplitude of any harmonic distortion for said harmonic of interest against a predetermined criteria; and means to couple said provisionally selected set of switching angles to said controller if said harmonic amplitude meets said criteria.
Claim 2
Dependent Claim
177 words
In an aircraft power supply system in which an inverter is used to generate an a.c. power output from a d.c. link voltage, an inverter controller comprising in combination; means to provisionally select a set of pulse-width-modulating switching angles in response to an a.c. power output parameter; means to simulate the operation of said inverter in response to inputs of said d.c. link voltage, said a.c. output parameter, and said pulse-width-modulating switching angles, said means to simulate providing an a.c. output signal whose wave form simulates an output of said inverter in response to said inputs; means to couple said inputs to said means to simulate; means to analyze said a.c. output signal to determine the amplitude of any harmonic distortion of said a.c. output signal for at least one harmonic of interest; means coupled to said analyzing means to test the amplitude of any harmonic distortion for said harmonic of interest against a predetermined criteria; and means to couple said provisionally selected set of switching angles to said controller if said harmonic amplitude meets said criteria.
Claim 3
Dependent Claim
33 words
In an aircraft power supply system as in claim 1 wherein said means to analyze determines the amplitude of any harmonic distortion in said a.c. output for at least two harmonics of interest.
Claim 4
Dependent Claim
23 words
In an aircraft power supply system as in claim 1 wherein said predetermined criteria establishes maximum amplitude for the amplitude of said harmonic.
Claim 5
Dependent Claim
24 words
In an aircraft power supply system as in claim 2 wherein said predetermined criteria establishes a maximum sum of the amplitudes of the harmonics.
Claim 6
Dependent Claim
30 words
In an aircraft power supply system as in claim 2 wherein said criteria comprises a combination of a maximum amplitude for each harmonic and a maximum sum for all harmonics.
References Cited (Backward Citations)
US4937723A
Cited
US4961130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |