US5550880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor current signal processor using analog substraction of an estimated largest sine wave component
Assignee: General Electric Co
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Filing: 1995-08-30
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Granted: 1996-08-27
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Expires: 2015-08-30
Abstract
Abstract A signal processing system includes a phase locked loop for locking a largest sine wave phase and frequency element of an incoming analog signal; an amplitude estimator for estimating a maximum amplitude of the incoming signal; a multiplier for multiplying the estimated largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and a subtractor for subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.
Inventors
- 👤 Aiman A. Abdel-Malek
- 👤 John E. Hershey
- 👤 Gerald B. Kliman
- 👤 Rudolph A. A. Koegl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:01
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/183
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
A signal processing system comprising: a phase locked loop for locking a largest sine wave phase and frequency element of an incoming analog signal; an amplitude estimator for estimating a maximum amplitude of the incoming signal; a multiplier for multiplying the largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and a subtractor for subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.
Claim 2
Dependent Claim
81 words
A signal processing system comprising: a phase locked loop for locking a largest sine wave phase and frequency element of an incoming analog signal; an amplitude estimator for estimating a maximum amplitude of the incoming signal; a multiplier for multiplying the largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and a subtractor for subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.
Claim 3
Dependent Claim
41 words
The signal processing system of claim 1 further including an analog-to-digital converter for digitizing the incoming signal and sending a digitized incoming signal to the amplitude estimator, and a digital-to-analog converter for converting the estimated maximum amplitude into an analog signal.
Claim 4
Dependent Claim
61 words
The signal processing system of claim 2 wherein the phase locked loop comprises a phase detector for providing a phase control signal derived from the incoming analog signal, and a voltage controlled oscillator coupled to the phase detector for using the phase control signal to provide the largest sine wave phase and frequency element to the multiplier and the phase detector.
Claim 5
Dependent Claim
32 words
The signal processing system of claim 1 wherein the multiplier is further capable of dividing the largest sine wave phase and frequency element by an intrinsic amplitude of the voltage controlled oscillator.
Claim 6
Dependent Claim
41 words
The signal processing system of claim 3 wherein the phase locked loop further includes a filter coupling the phase detector to the voltage controlled oscillator for filtering the phase control signal and providing a filtered signal to the voltage controlled oscillator.
Claim 7
Dependent Claim
40 words
The system of claim 1, further comprising a digital signal processor, and a switch between the subtractor and the digital signal processor for passing the diagnostic signal to the digital signal processor after an initial phase and frequency detection period.
Claim 8
Dependent Claim
69 words
A signal processing method comprising the steps of: locking a largest sine wave phase and frequency element of an incoming analog signal; estimating a maximum amplitude of the incoming signal; multiplying the largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.
Claim 9
Dependent Claim
69 words
A signal processing method comprising the steps of: locking a largest sine wave phase and frequency element of an incoming analog signal; estimating a maximum amplitude of the incoming signal; multiplying the largest sine wave phase and frequency element by the estimated maximum amplitude to provide an estimated largest sine wave component; and subtracting the estimated largest sine wave component from the incoming signal to provide a diagnostic signal.
Claim 10
Dependent Claim
21 words
The method of claim 7, further including digitizing the incoming signal prior to estimating the maximum amplitude of the incoming signal.
Claim 11
Dependent Claim
81 words
The method of claim 8, wherein the step of locking the largest sine wave phase and frequency element of the incoming signal includes detecting the phase and frequency element of the incoming signal with a phase detector, filtering the detected phase and frequency element, passing the filtered detected phase and frequency element through a voltage controlled oscillator to provide the largest sine wave phase and frequency element, and supplying the largest sine wave phase and frequency element to the phase detector.
Claim 12
Dependent Claim
42 words
The method of claim 7, wherein the step of multiplying the largest sine wave phase and frequency element by the estimated maximum amplitude includes dividing the largest sine wave phase and frequency element by an intrinsic amplitude of the voltage controlled oscillator.
Claim 13
Dependent Claim
80 words
The method of claim 7, wherein the step of locking the largest sine wave phase and frequency element comprises using a phase locked loop to lock the largest sine wave phase and frequency element of the incoming signal, and wherein the step of subtracting the estimated largest sine wave component from the incoming signal occurs after an initial phase detection period having a length of time sufficiently long for the phase locked loop to derive a proper phase and frequency.
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) | 1999-08-27 | 2000-02-26 | 2000-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-27 | 2004-02-26 | 2004-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-27 | 2008-02-26 | 2008-08-27 | $7700.00 | Window Closed / Lapsed |