US3886430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase and frequency synchronizing circuit
Assignee: Reliance Electric Co
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Filing: 1973-12-06
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Granted: 1975-05-27
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Expires: 1993-12-06
Abstract
Abstract An inverter apparatus is disclosed for synchronizing a carrier wave form to a reference wave form to have a given frequency relation for controlling thyristor means. The carrier and reference frequencies are independently generated by a carrier generator and a reference generator to have a given frequency relationship. A detector determines the frequency difference of the carrier wave form from the given frequency relationship. An integrator interconnects the detector and carrier generator to modify the carrier frequency for resynchronization when the carrier wave form is leading or lagging the reference wave form at the given frequency relationship and for modifying the carrier phase when the carrier wave form is lagging the reference wave form at the given frequency relationship. The phase modification may include modifying the slope of the carrier wave form to contract a cycle thereof to phase synchronize the carrier with the reference wave form.
Inventors
- 👤 Udo H Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:48
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
An apparatus for synchronizing a first wave form and a second wave form to have a given frequency and phase relation, comprising in combination: a circuit for establishing the first wave form; a circuit for establishing the second wave form; detector means for providing an output of the difference from the given frequency relation of the first and second wave forms; phase modifying means connected between said detector means and one of said circuits for modifying the phase of the second wave form to synchronize the first and second wave forms at the given phase relation; integrator means connected to said detector means for storing a correction signal in accordance with said output of said detector means; and means for applying said correction signal to one of said circuits for modifying the frequency of said second wave form to synchronize the fIrst and second wave forms at the given frequency relation.
Claim 2
Independent Claim
151 words
An apparatus for synchronizing a first wave form and a second wave form to have a given frequency and phase relation, comprising in combination: a circuit for establishing the first wave form; a circuit for establishing the second wave form; detector means for providing an output of the difference from the given frequency relation of the first and second wave forms; phase modifying means connected between said detector means and one of said circuits for modifying the phase of the second wave form to synchronize the first and second wave forms at the given phase relation; integrator means connected to said detector means for storing a correction signal in accordance with said output of said detector means; and means for applying said correction signal to one of said circuits for modifying the frequency of said second wave form to synchronize the fIrst and second wave forms at the given frequency relation.
Claim 3
Dependent Claim
24 words
An apparatus as set forth in claim 1, wherein said phase modifying means includes means for modifying the slope of said second wave form.
Claim 4
Dependent Claim
23 words
An apparatus as set forth in claim 2, wherein said phase modifying means includes means for modifying positive and negative wave form slopes.
Claim 5
Dependent Claim
40 words
An apparatus as set forth in claim 1, wherein said detector means includes; means for determining a synchronizing point of the second wave form; and means for indicating a phase difference between said synchronizing point and the first wave form.
Claim 6
Independent Claim
199 words
An apparatus for synchronizing a reference wave form and a carrier wave form to have a given phase and frequency relation, comprising in combination: a converter for establishing a converter wave form; a reference wave form circuit connected to said converter establishing the reference wave form at a frequency related to the frequency of said converter wave form; a carrier generator for generating the carrier wave form; means for determining a synchronizing point of the carrier wave form; phase detector means for providing a phase output to indicate the phase difference between said synchronizing point and said converter wave form; slope modifying means connecting said phase detector means to said carrier generator for modifying the slope of said carrier wave form for synchronizing the reference and carrier wave forms at the given phase relation; integrator means connected to said phase detector means for storing a correction signal in accordance with the phase output of said phase detector means; and means connecting said integrator means for continuously applying said correction signal to said carrier generator for modifying the frequency of the carrier wave form to synchronize the carrier wave form with the reference wave form at a given frequency relation.
Claim 7
Independent Claim
199 words
An apparatus for synchronizing a reference wave form and a carrier wave form to have a given phase and frequency relation, comprising in combination: a converter for establishing a converter wave form; a reference wave form circuit connected to said converter establishing the reference wave form at a frequency related to the frequency of said converter wave form; a carrier generator for generating the carrier wave form; means for determining a synchronizing point of the carrier wave form; phase detector means for providing a phase output to indicate the phase difference between said synchronizing point and said converter wave form; slope modifying means connecting said phase detector means to said carrier generator for modifying the slope of said carrier wave form for synchronizing the reference and carrier wave forms at the given phase relation; integrator means connected to said phase detector means for storing a correction signal in accordance with the phase output of said phase detector means; and means connecting said integrator means for continuously applying said correction signal to said carrier generator for modifying the frequency of the carrier wave form to synchronize the carrier wave form with the reference wave form at a given frequency relation.
Claim 8
Dependent Claim
26 words
An apparatus as set forth in claim 5, wherein said continuous correction signal establishes a zero phase error synchronization between said carrier and reference wave forms.
Claim 9
Dependent Claim
78 words
An apparatus as set forth in claim 5, wherein said phase detector means includes means for providing a first phase output for indicating a lagging carrier wave form and a second phase output for indicating a leading carrier wave form with respect to said given frequency relationship of said carrier wave form and the reference wave form; and wherein said slope modifying means is connected to said first phase output to phase resynchronize a lagging carrier wave form.
Claim 10
Dependent Claim
17 words
An apparatus as set forth in claim 5, including means for varying the frequency of said converter.
Claim 11
Dependent Claim
51 words
An apparatus as set forth in claim 8, wherein said phase detector and said integrator means vary the frequency of the carrier wave form in accordance with changes in the frequency of said converter wave form to maintain the given relationship between said converter wave form and the carrier wave form.
Claim 12
Dependent Claim
26 words
An apparatus as set forth in claim 5, including means for changing the given frequency relationship of said converter wave form and the carrier wave form.
Claim 13
Dependent Claim
35 words
An apparatus as set forth in claim 5, wherein said given frequency relationship includes; one of said converter and carrier wave forms being a multiple of the other of said converter and carrier wave forms.
Claim 14
Dependent Claim
334 words
An inverter apparatus for phase locking a reference wave form and a carrier wave form to control thyristor means, comprising in combination: a variable level reference source; a converter connected to said reference source for developing a converter wave form having a frequency determined by said level of said reference source; a time delay circuit connected to said converter for providing a delayed wave form which is delayed in time relative to said converter wave form; a divider circuit connected to said time delay circuit for establishing the reference wave form having a frequency which is relAted to the frequency of said delayed wave form; a carrier generator for generating the carrier wave form having a frequency determined by an input level to an input of said carrier generator; means for applying an input level to said carrier generator input to establish the frequency of the carrier wave form to be related to said converter wave form frequency; detector means connected to said carrier generator and said time delay circuit to provide a first detector output for indicating a lagging carrier wave form relative to said delayed wave form and to provide a second detector output for indicating a leading carrier wave form relative to said delayed wave form; slope modifier means connected to said carrier generator for modifying the slope of said carrier wave form; means for connecting said detector means to said slope modifier means for modifying the slope of the carrier wave form in accordance with said first detector output to phase resynchronize lagging carrier wave form; integrator means connected to said detector means for storing a correction signal in accordance with said first and second detector outputs; and means connecting said integrator means to said carrier generator for modifying the frequency of the carrier wave form in accordance with said correction signal to frequency resynchronize leading and lagging carrier wave forms and to establish a zero phase error synchronization of the carrier wave form relative to the reference wave form.
Claim 15
Dependent Claim
334 words
An inverter apparatus for phase locking a reference wave form and a carrier wave form to control thyristor means, comprising in combination: a variable level reference source; a converter connected to said reference source for developing a converter wave form having a frequency determined by said level of said reference source; a time delay circuit connected to said converter for providing a delayed wave form which is delayed in time relative to said converter wave form; a divider circuit connected to said time delay circuit for establishing the reference wave form having a frequency which is relAted to the frequency of said delayed wave form; a carrier generator for generating the carrier wave form having a frequency determined by an input level to an input of said carrier generator; means for applying an input level to said carrier generator input to establish the frequency of the carrier wave form to be related to said converter wave form frequency; detector means connected to said carrier generator and said time delay circuit to provide a first detector output for indicating a lagging carrier wave form relative to said delayed wave form and to provide a second detector output for indicating a leading carrier wave form relative to said delayed wave form; slope modifier means connected to said carrier generator for modifying the slope of said carrier wave form; means for connecting said detector means to said slope modifier means for modifying the slope of the carrier wave form in accordance with said first detector output to phase resynchronize lagging carrier wave form; integrator means connected to said detector means for storing a correction signal in accordance with said first and second detector outputs; and means connecting said integrator means to said carrier generator for modifying the frequency of the carrier wave form in accordance with said correction signal to frequency resynchronize leading and lagging carrier wave forms and to establish a zero phase error synchronization of the carrier wave form relative to the reference wave form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |