US3918044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated coordinate resolution circuit
Assignee: Aviation Electric Ltd
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Filing: 1973-09-07
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Granted: 1975-11-04
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Expires: 1993-09-07
Abstract
Abstract A converter for converting angular or heading datum from a shaft position to electrical signals corresponding to sine-cosine components and in which the electrical signals are immune to the influence of unwanted deteriorating factors, such as temperature effects and energizing voltage fluctuations. The sine-cosine components are provided in terms of voltage ratios rather than absolute voltages.
Inventors
- 👤 Dimitri Alpatoff
- 👤 Jacques Paul-Emile Lamontagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:14
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/38; G08C19/46; H; H03; H03M; H03M1/00; H03M1/12; H03M1/64; H03M1/645
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals including a bridge circuit for shifting the relative phases of the signals equally in opposite directions and for providing a fixed amplitude output except for the source irregularities, and means responsive to the amplitudes of the signals and reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled.
Claim 2
Independent Claim
143 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals including a bridge circuit for shifting the relative phases of the signals equally in opposite directions and for providing a fixed amplitude output except for the source irregularities, and means responsive to the amplitudes of the signals and reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled.
Claim 3
Dependent Claim
41 words
A device for converting angular movement to electrical signals as described in claim 1 in which the means for deriving a reference voltage includes detecting means for detecting amplitudes of the phase-shifted signals and means for combining the detected amplitude signals.
Claim 4
Independent Claim
177 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregUlarities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals so that the amplitude of the reference voltage fluctuates in accordance with fluctuations of the signals due to the irregularities in the energizing source, and means responsive to the amplitudes of the signals and reference voltage including a ramp generator for converting the reference voltage to a ramp voltage and comparing means for comparing the sine and cosine signals with the ramp signal to provide outputs corresponding to the ratio of the sine signal and reference voltage and to the ratio of the cosine signal and reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled.
Claim 5
Independent Claim
177 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregUlarities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals so that the amplitude of the reference voltage fluctuates in accordance with fluctuations of the signals due to the irregularities in the energizing source, and means responsive to the amplitudes of the signals and reference voltage including a ramp generator for converting the reference voltage to a ramp voltage and comparing means for comparing the sine and cosine signals with the ramp signal to provide outputs corresponding to the ratio of the sine signal and reference voltage and to the ratio of the cosine signal and reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled.
Claim 6
Dependent Claim
41 words
A device for converting angular movement to electrical signals as described in claim 3 which includes amplitude demodulator means for converting the sine and cosine signals to direct current signals for comparison with the ramp voltage from the ramp generator means.
Claim 7
Dependent Claim
42 words
A device for converting angular movement to electrical signals as described in claim 3 which includes half wave rectifier means for converting the sine and cosine signals to direct current signals for comparison with the ramp voltage from the ramp generator means.
Claim 8
Independent Claim
185 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals so that the amplitude of the reference voltage fluctuates in accordance with fluctuations of the signals due to the irregularities in the energizing source, means responsive to the amplitudes of the signals and reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled, and means for converting the signal ratios to digital signals including a source of pulses, a pair of AND gates connected to the pulse source and controlled by the signal ratios and a counter connected to each of the AND gates for counting the pulses passed thereby.
Claim 9
Independent Claim
185 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two signals so that the amplitude of the reference voltage fluctuates in accordance with fluctuations of the signals due to the irregularities in the energizing source, means responsive to the amplitudes of the signals and reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to irregularities of the energizing voltage are cancelled, and means for converting the signal ratios to digital signals including a source of pulses, a pair of AND gates connected to the pulse source and controlled by the signal ratios and a counter connected to each of the AND gates for counting the pulses passed thereby.
Claim 10
Independent Claim
249 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of alternating voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two alternating signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two alternating signals so that the reference voltage fluctuates in accordance with the fluctuations of the signals due to irregularities in the energizing source, said means including a bridge circuit for shifting the relative phases of the signals equally in opposite directions and a detector for detecting amplitudes of each of the phase-shifted signals and means for combining the detected signals, means for converting each of the sine and cosine alternating signals to direct current signals, and means responsive to the direct current signals and to the reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to the irregularities of the energizing voltage are cancelled, said last mentioned means including a ramp generator for converting the reference voltage to a ramp voltage and comparing means for comparing the sine and cosine direct current signals with the ramp signal to provide outputs corresponding to the ratio of the sine and reference signals and to the ratio of the cosine and reference signals.
Claim 11
Independent Claim
249 words
A device for converting angular movement to electrical signals comprising a signal device connected to a source of alternating voltage subject to irregularities and energized thereby and having an angularly displaceable element and providing two alternating signals varying in amplitude as a function of the sine and cosine of the angular displacement, the signals being subject to the irregularities in the energizing source and fluctuating as a result thereof, means for deriving a reference voltage from the two alternating signals so that the reference voltage fluctuates in accordance with the fluctuations of the signals due to irregularities in the energizing source, said means including a bridge circuit for shifting the relative phases of the signals equally in opposite directions and a detector for detecting amplitudes of each of the phase-shifted signals and means for combining the detected signals, means for converting each of the sine and cosine alternating signals to direct current signals, and means responsive to the direct current signals and to the reference voltage and providing outputs corresponding to the ratios of the signals and the reference voltage in which fluctuations due to the irregularities of the energizing voltage are cancelled, said last mentioned means including a ramp generator for converting the reference voltage to a ramp voltage and comparing means for comparing the sine and cosine direct current signals with the ramp signal to provide outputs corresponding to the ratio of the sine and reference signals and to the ratio of the cosine and reference signals.
Claim 12
Dependent Claim
24 words
A device for converting angular movement to electrical signals as described in claim 7 including means for converting the signal ratios to digital signals.
Claim 13
Dependent Claim
63 words
A device for converting angular movement to electrical signals as described in claim 8 in which the means for converting the signal ratios to digital signals includes a source of pulses, a pair of AND gates connected to the pulse source and controlled by the signal ratios and a counter connected to each of the AND gates for counting the pulses passed thereby.
Claim 14
Dependent Claim
27 words
A device for converting angular movement to electrical signals as described in claim 7 including means for filtering the sine and cosine signals connected to the synchro.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |