Patent US3628114A successfully refreshed from Google Patents.
US3628114A
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Sync acquisition system
Assignee: Westinghouse Electric Corp
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Filing: 1969-11-03
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Granted: 1971-12-14
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Expires: 1989-11-03
Abstract
Abstract A sync acquisition system for synchronizing a controlled element, such as a motor or a voltage-controlled oscillator, with a reference frequency wherein the feedback frequency derived from the controlled element is compared with the reference frequency for providing outputs for accelerating or braking the controlled element in response to the comparison and also providing an output indicative of the phase difference between the reference and feedback frequencies so that when the controlled element is near enough to the synchronous state it is locked to the reference in response to the absence of accelerate or brake output for a predetermined time.
Inventors
- 👤 Tamas I Pattantyus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:37
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/085; H03L7/089; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
In a sync acquisition system for synchronizing a controlled element with reference frequency signals, the combination of: first means for providing feedback frequency signals indicative of the operating frequency of said controlled element; second means for comparing said reference frequency signals with said feedback frequency signals and for providing a first output if said reference frequency is higher than the feedback frequency, a second output if the reference frequency is lower than the feedback frequency, and a third output indicative of the phase relationship between the reference and feedback frequencies; third means for providing an accelerate output for increasing the operating frequency of said controlled element in response to said first output and providing a brake output for decreasing the operating frequency of said controlled element in response to said second output; fourth means being rendered responsive to said reference frequency signals in response to either said first or second output and permitting said accelerate or brake output to be provided until no first or second output is provided for a predetermined time when a fourth output is provided thereby; and fifth means for receiving said third output and providing a sync output in response thereto indicative that said reference frequeNcy signal and said feedback frequency signals have a desired phase relationship therebetween for causing said controlled element to be operated in response thereto in the absence of said first or second output.
Claim 2
Dependent Claim
233 words
In a sync acquisition system for synchronizing a controlled element with reference frequency signals, the combination of: first means for providing feedback frequency signals indicative of the operating frequency of said controlled element; second means for comparing said reference frequency signals with said feedback frequency signals and for providing a first output if said reference frequency is higher than the feedback frequency, a second output if the reference frequency is lower than the feedback frequency, and a third output indicative of the phase relationship between the reference and feedback frequencies; third means for providing an accelerate output for increasing the operating frequency of said controlled element in response to said first output and providing a brake output for decreasing the operating frequency of said controlled element in response to said second output; fourth means being rendered responsive to said reference frequency signals in response to either said first or second output and permitting said accelerate or brake output to be provided until no first or second output is provided for a predetermined time when a fourth output is provided thereby; and fifth means for receiving said third output and providing a sync output in response thereto indicative that said reference frequeNcy signal and said feedback frequency signals have a desired phase relationship therebetween for causing said controlled element to be operated in response thereto in the absence of said first or second output.
Claim 3
Dependent Claim
38 words
The combination of claim 1 wherein: said second means includes a bistable element providing said third output at substantially the reference frequency and having a pulse width indicative of the phase relationship between said reference and feedback signal.
Claim 4
Dependent Claim
38 words
The combination of claim 2 wherein: said fifth means includes filter means for receiving said third output and rejecting the reference frequency and providing said sync output proportional to the phase difference between said reference and feedback signals.
Claim 5
Dependent Claim
48 words
The combination of claim 1 wherein: said third means includes an accelerate bistable element and a brake bistable element operative to provide respectively said accelerate and brake outputs in response to said first and second outputs until reset in response to said fourth output from said fourth means.
Claim 6
Dependent Claim
76 words
The combination of claim 1 wherein: said fourth means includes an N-counter operative to be reset to a predetermined count in response to said first or second output and to count to N-counts in response to said reference signals unless reset by occurrence of said first or second output prior to reaching the N-count, upon reaching the N-count said fourth output being provided to terminate the counting operation and to terminate said accelerate or brake output.
Claim 7
Dependent Claim
78 words
The combination of claim 5 wherein: said second means includes a bistable element providing said third output of substantially the reference frequency and having a pulse width indicative of the phase relationship between said reference and feedback signals, said fifth means includes filter means for receiving said third output and rejecting said reference frequency and providing said sync output proportional to the phase difference between said reference and feedback signals for controlling said controlled element under synchronized conditions.
References Cited (Backward Citations)
US3356921A
Cited
US3361949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |