Patent US5387859A successfully refreshed from Google Patents.
US5387859A
Expired / Lapsed
US
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Stepped waveform VSCF system with engine start capability
Assignee: Honeywell International Inc
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Filing: 1993-03-25
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Granted: 1995-02-07
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Expires: 2013-03-25
Abstract
Abstract A power converter that can be used either as a start converter or as a variabe speed constant frequency converter is utilized within a stepped waveform VSCF system having engine start capability. Interfacing with the converter are a load bus, a contactor, a field excitation controller and a starter/generator having a main generator, an exciter generator and a permanent magnet generator. Magnetic components and semiconductor components perform multi-functions and minimal degradation of input power quality occurs.
Inventors
- 👤 Muthu K. Murugan
- 👤 Robert C. Eckenfelder
- 👤 James Widdis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:12
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/483; H02M7/49; F; F02; F02N; F02N11/00; F02N11/04; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02M5/4585
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
225 words
A stepped waveform VSCF system with engine start capability comprising: starter/generator means mounted to an engine; converter means connected to said starter/generator means and including a plurality of DC/AC inverters connected to said starter/generator means, a plurality of high frequency trap-tuned filters connected to contactor means, three phase transformer means connected between said plurality of high frequency trap-tuned filters and said plurality of DC/AC inverters for providing isolation, and filter capacitor means connected across said plurality of DC/AC inverters; field excitation controller means connected to said starter/generator means; control power supply means connected to said field excitation controller means; said contactor means connected to said converter means; load bus means connected to said contactor means; said three phase transformer means including secondary winding means connected to said plurality of high frequency trap-tuned filters and primary winding means connected to said plurality of DC/AC inverters; said converter means including timing logic means for switching on and off at a desired frequency, each of a plurality of semiconductor switches to produce a multiple step three-phase output voltage at said secondary winding means of said three phase transformer means; said converter means further including PWM controller means connected to said control power supply means; resolver means connected between said starter/generator means and said PWM controller means; and back EMF sensor circuit means connected to said PWM controller means.
Claim 2
Dependent Claim
225 words
A stepped waveform VSCF system with engine start capability comprising: starter/generator means mounted to an engine; converter means connected to said starter/generator means and including a plurality of DC/AC inverters connected to said starter/generator means, a plurality of high frequency trap-tuned filters connected to contactor means, three phase transformer means connected between said plurality of high frequency trap-tuned filters and said plurality of DC/AC inverters for providing isolation, and filter capacitor means connected across said plurality of DC/AC inverters; field excitation controller means connected to said starter/generator means; control power supply means connected to said field excitation controller means; said contactor means connected to said converter means; load bus means connected to said contactor means; said three phase transformer means including secondary winding means connected to said plurality of high frequency trap-tuned filters and primary winding means connected to said plurality of DC/AC inverters; said converter means including timing logic means for switching on and off at a desired frequency, each of a plurality of semiconductor switches to produce a multiple step three-phase output voltage at said secondary winding means of said three phase transformer means; said converter means further including PWM controller means connected to said control power supply means; resolver means connected between said starter/generator means and said PWM controller means; and back EMF sensor circuit means connected to said PWM controller means.
Claim 3
Dependent Claim
59 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein said starter/generator means comprises: permanent magnet generator means connected to said engine; exciter generator means connected to said permanent magnet generator means and to said field excitation controller means; and, main generator means connected to said exciter generator means and to said converter means.
Claim 4
Dependent Claim
42 words
A stepped waveform VSCF system with engine start capability as claimed in claim 2 wherein said permanent magnet generator means provides power to said field excitation controller means which influences excitation of exciter of said exciter generator means within said starter/generator means.
Claim 5
Dependent Claim
34 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein each of said plurality of DC/AC inverters comprises: a plurality of semiconductor switches having associated flywheel rectifiers or diodes.
Claim 6
Dependent Claim
25 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein said converter means can be used as a start converter.
Claim 7
Dependent Claim
28 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein said converter means can be used as a variable speed constant frequency converter.
Claim 8
Dependent Claim
40 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein said converter means can be used as a start converter and as a variable speed constant frequency converter causing minimal degradation of input power quality.
Claim 9
Dependent Claim
68 words
A stepped waveform VSCF system with engine start capability as claimed in claim 1 wherein said converter means comprises: five DC/AC three-phase inverters connected to said starter/generator means; three high frequency trap-tuned filters connected to said contactor means; three phase transformer means connected between said three high frequency trap-tuned filters and said five DC/AC converters for providing isolation; and, filter capacitor means connected across said five DC/AC converters.
Claim 10
Dependent Claim
31 words
A stepped waveform VSCF system with engine start capability as claimed in claim 8 wherein each of said five DC/AC inverters comprises: six semiconductor switches having associated flywheel rectifiers or diodes.
Claim 11
Dependent Claim
46 words
A stepped waveform VSCF system with engine start capability as claimed in claim 9 wherein said three phase transformer means comprises: said secondary winding means connected to said three high frequency trap-tuned filters; and, said primary winding means connected to four of said five DC/AC inverters.
Claim 12
Dependent Claim
58 words
A stepped waveform VSCF system with engine start capability as claimed in claim 10 wherein said converter means further comprises: said timing logic means for switching on and off at the desired frequency, each of said six semiconductor switches to produce a twenty-four step three-phase AC output voltage at said secondary winding means of said three-phase transformer means.
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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) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |