US3710133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronization of static inverters
Assignee: Ward Leonard Electric Co Inc
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Filing: 1970-09-09
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Granted: 1973-01-09
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Expires: 1990-09-09
Abstract
Abstract A system for synchronizing the static inverter enables the phasing of the output from a static inverter in correspondence to an alternate power supply. The synchronized system compares the static inverter output with the alternate power source in a phase detector which outputs an error correcting signal which is used to adjust the static inverter master clock.
Inventors
- 👤 R Ferraro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:44
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
An apparatus for synchronizing the output frequency of a static inverter with the output frequency of an alternate power source comprising phase detector means for deriving a correction voltage corresponding to the phase difference between said static inverter output and said alternate power source signal output, means for coupling a signal from said static inverter output and a signal from said alternate power source output to said phase detector means, means for sampling said correction voltage to produce a correction voltage signal, means for coupling said integrated sample correction voltage to a voltage tunable master clock and means for coupling said voltage tunable master clock to said static inverter for controlling the output frequency of said static inverter.
Claim 2
Independent Claim
118 words
An apparatus for synchronizing the output frequency of a static inverter with the output frequency of an alternate power source comprising phase detector means for deriving a correction voltage corresponding to the phase difference between said static inverter output and said alternate power source signal output, means for coupling a signal from said static inverter output and a signal from said alternate power source output to said phase detector means, means for sampling said correction voltage to produce a correction voltage signal, means for coupling said integrated sample correction voltage to a voltage tunable master clock and means for coupling said voltage tunable master clock to said static inverter for controlling the output frequency of said static inverter.
Claim 3
Dependent Claim
42 words
An apparatus as claimed in claim 1 including means for coupling a signal from said static inverter and a signal from said alternate power comprising first and second phase shift networks for said static inverter and said alternate power source signals respectively.
Claim 4
Dependent Claim
31 words
An apparatus as claimed in claim 2 wherein the means for coupling a signal from said static inverter and a signal from said alternate power source comprises first and second transformers.
Claim 5
Dependent Claim
18 words
An apparatus as claimed in claim 1 wherein the phase detector means comprises first and second operational amplifiers.
Claim 6
Dependent Claim
18 words
An apparatus as claimed in claim 3 wherein the phase detector means comprises first and second operational amplifiers.
Claim 7
Dependent Claim
18 words
An apparatus as claimed in claim 1 wherein the means for sampling said correction voltage comprises a transistor.
Claim 8
Dependent Claim
18 words
An apparatus as claimed in claim 5 wherein the means for sampling said correction voltage comprises a transistor.
Claim 9
Dependent Claim
22 words
An apparatus as claimed in claim 1 wherein the means for integrating said sample correction voltage comprises a resistor and a capacitor.
Claim 10
Dependent Claim
22 words
An apparatus as claimed in claim 7 wherein the means for integrating said sample correctioN voltage comprises a resistor and a capacitor.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |