Patent US3767991A successfully refreshed from Google Patents.
US3767991A
Expired / Lapsed
US
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Microelectronic three-wire synchronizer
Assignee: Bendix Corp
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Filing: 1972-08-31
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Granted: 1973-10-23
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Expires: 1992-08-31
Abstract
Abstract A three-wire synchronizer includes a system of microcircuits interfaced for determining with minimum interaction and at a command instant the position of a synchro transmitter shaft, and using the Y-connected synchro stator voltage relationship as a zero reference for providing a bipolar d.c. signal proportional to changes in shaft position with respect to the reference.
Inventors
- 👤 R James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:11
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/38; G08C19/46; G08C19/48
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
For use with a signal device having an angularly displaceable element and providing alternating signals corresponding to the displacement of said element, a synchronizer comprising: a phase shifter connected to the signal device for shifting the phase of the signals therefrom and for providing a signal having a phase corresponding to the displacement of the signal device element; means connected to the phase shifter for increasing the frequency of the signal therefrom; means for providing a fixed phase signal commensurate with a reference displacement of the signal device element at a predetermined instant; phase detector means connected to the frequency increasing means and to the reference displacement signal means for providing a signal corresponding to the difference in phase of the signals therefrom; and means connected to the phase detector means and responsive to the signal therefrom for providing a signal corresponding to the change in displacement of the signal device element.
Claim 2
Dependent Claim
152 words
For use with a signal device having an angularly displaceable element and providing alternating signals corresponding to the displacement of said element, a synchronizer comprising: a phase shifter connected to the signal device for shifting the phase of the signals therefrom and for providing a signal having a phase corresponding to the displacement of the signal device element; means connected to the phase shifter for increasing the frequency of the signal therefrom; means for providing a fixed phase signal commensurate with a reference displacement of the signal device element at a predetermined instant; phase detector means connected to the frequency increasing means and to the reference displacement signal means for providing a signal corresponding to the difference in phase of the signals therefrom; and means connected to the phase detector means and responsive to the signal therefrom for providing a signal corresponding to the change in displacement of the signal device element.
Claim 3
Dependent Claim
95 words
A synchronizer as described in claim 1, wherein the phase shifter includes: a first phase shifting circuit for shifting the phase of the carrier of one of the alternating signals by a predetermined angle; a second phase shifting circuit for shifting the phase of the carrier of another of the alternating signals by another predetermined angle; and amplifier means connected in open loop configuration for sensing zero crossing of the signals from the first and second phase shifting circuits to provide the signal having a phase corresponding to the displacement of the signal device element.
Claim 4
Dependent Claim
52 words
A synchronizer as described by claim 1, wherein: the means connected to the phase shifter for increasing the frequency of the signal therefrom includes an exclusive OR circuit for doubling the frequency of said signal; and a zener diode is connected for directly interfacing the phase shifter and the exclusive OR circuit.
Claim 5
Dependent Claim
145 words
A synchronizer as described by claim 1, wherein the means for providing a fixed phase signal commensurate with a reference displacement of the signal device element at a predetermined instant includes: means for providing a reference signal at the frequency of the alternating signals from the signal device; means connected to the reference signal means for providing a signal at said frequency and at a predetermined fixed phase; means connected to the fixed phase signal means and driven by the signal therefrom for providing a signal having a sawtooth waveform; integrator means connected to the phase detector means and responsive to a command signal at the predetermined instant for providing a feedback signal; and a pulse width modulaTor connected to the sawtooth waveform signal means and to the integrator and responsive to the sawtooth waveform and the feedback signal for providing the reference displacement signal.
Claim 6
Dependent Claim
65 words
A synchronizer as described by claim 1, wherein the phase detector means includes: a phase detector circuit connected to the frequency increasing means and to the reference displacement signal means for providing pulses at an amplitude corresponding to the phase difference of the signals therefrom; and means connected to the phase detector circuit for maintaining the amplitude of the pulses therefrom at a constant level.
Claim 7
Dependent Claim
97 words
A synchronizer as described by claim 5, wherein: the means connected to the phase detector circuit for maintaining the amplitude of the pulses therefrom at a constant level includes: means for providing a regulated output; a chopper circuit connected to the phase detector circuit and to the regulated output means and driven by the phase detector for chopping the regulated output; and a differential amplifier having one input connected to the regulated output means and another input connected to the chopper circuit, and filtering means connected in feedback relation to the chopper circuit input of the amplifier.
Claim 8
Dependent Claim
55 words
A synchronizer as described by claim 1, wherein the means connected to the phase detector means and responsive to the signal therefrom for providing a signal corresponding to the change in displacement of the signal device element includes: filter means having an amplifier with feedback means for reducing output ripple without increasing output response time.
Claim 9
Dependent Claim
31 words
A synchronizer as described by claim 4, including: means connecting the pulse width modulator to the phase detector means for conditioning the reference displacement signal for driving said phase detector means.
Claim 10
Dependent Claim
44 words
A synchronizer as described by claim 4, including: a threshold circuit connected to the phase detector means and to the integrator and effective at times other than the predetermined instant for resetting the integrator to update the reference displacement of the signal device element.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |