US3886431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing circuit having an infinite number of ratios
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 for controlling thyristor means with a reference and a carrier wave form is disclosed including a variable frequency reference generator for the reference wave form and a carrier generator for establishing a carrier wave form at a nominal frequency. The nominal frequency of the carrier generator is established to provide a first integral ratio of the nominal frequency to a given frequency of the reference wave form. The carrier frequency is varied in accordance with variations of the reference frequency to maintain the first integral ratio until the variation of the carrier frequency from the nominal frequency reaches a predetermined boundary whereat the carrier generator is re-established at the nominal frequency. The predetermined boundary is selected such that the reestablishment of the nominal frequency provides a second integral ratio of the carrier frequency to the reference frequency. Consequently, an infinite number of integral ratios of the carrier frequency to reference frequency are available with this apparatus.
Inventors
- 👤 Udo H Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:11
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
An apparatus for synchronizing a first wave form with a second wave form, comprising in combination: a first circuit for establishing a variable frequency first wave form; a second circuit for establishing a second wave form at a nominal frequency; said nominal frequency providing a first integral ratio of said nominal frequency to a given frequency of the first wave form; means including iNtegrator means for varying the second wave form frequency in accordance with the first wave form frequency to maintain said first integral ratio; and ratio change means including reset means for resetting said integrator means for re-establishing the second wave form at said nominal frequency resulting in a second integral ratio of the second wave form to the first wave form frequency when the variation of the second wave form frequency reaches a predetermined boundary.
Claim 2
Independent Claim
138 words
An apparatus for synchronizing a first wave form with a second wave form, comprising in combination: a first circuit for establishing a variable frequency first wave form; a second circuit for establishing a second wave form at a nominal frequency; said nominal frequency providing a first integral ratio of said nominal frequency to a given frequency of the first wave form; means including iNtegrator means for varying the second wave form frequency in accordance with the first wave form frequency to maintain said first integral ratio; and ratio change means including reset means for resetting said integrator means for re-establishing the second wave form at said nominal frequency resulting in a second integral ratio of the second wave form to the first wave form frequency when the variation of the second wave form frequency reaches a predetermined boundary.
Claim 3
Dependent Claim
15 words
An apparatus as set forth in claim 1, wherein said nominal frequency is substantially fixed.
Claim 4
Dependent Claim
49 words
An apparatus as set forth in claim 1, wherein said varying means includes, detector means for determining the frequency difference of the first and second wave forms relative to a given integral ratio, and means for connecting said detector means to said second circuit for varying the frequency thereof.
Claim 5
Dependent Claim
45 words
An apparatus as set forth in claim 1, wherein said first circuit includes, a first source establishing a first level; and a first wave form generator connected to said first source for generating the first wave form at a frequency determined by said first level.
Claim 6
Independent Claim
167 words
An apparatus for controlling thyristor means with a reference and a carrier wave form, comprising in combination: a reference generator circuit for generating a variable frequency reference wave form; a carrier generator circuit for generating the carrier wave form at a nominal carrier frequency, said nominal carrier frequency providing a first integral ratio of said nominal frequency to a given frequency of the reference wave form; input means for said carrier generator to vary the carrier frequency about said nominal frequency; means including integrator means interconnecting said reference generator circuit and said input means for changing the carrier frequency in accordance with the reference frequency to maintain said first integral ratio; and means including reset means for resetting said integrator means to re-establish said nominal carrier frequency at a second integral ratio to the reference frequency when the variation of the carrier frequency from said nominal frequency reaches a predetermined boundary to provide a substantially infinite number of synchronized integral ratios of the carrier to reference frequency.
Claim 7
Independent Claim
167 words
An apparatus for controlling thyristor means with a reference and a carrier wave form, comprising in combination: a reference generator circuit for generating a variable frequency reference wave form; a carrier generator circuit for generating the carrier wave form at a nominal carrier frequency, said nominal carrier frequency providing a first integral ratio of said nominal frequency to a given frequency of the reference wave form; input means for said carrier generator to vary the carrier frequency about said nominal frequency; means including integrator means interconnecting said reference generator circuit and said input means for changing the carrier frequency in accordance with the reference frequency to maintain said first integral ratio; and means including reset means for resetting said integrator means to re-establish said nominal carrier frequency at a second integral ratio to the reference frequency when the variation of the carrier frequency from said nominal frequency reaches a predetermined boundary to provide a substantially infinite number of synchronized integral ratios of the carrier to reference frequency.
Claim 8
Dependent Claim
227 words
An inverter for controlling thyristor means with a reference and a carrier wave form, comprising in combinaton: a first source for establishing a first level; a reference generator circuit connected to said first source for generating the reference wave form with a reference frequency determined by said first level; a carrier generator having an input, said carrier generator generating the carrier wave form at a frequency in accordance with the level at said input of said carrier generator; a second source for establishing a second level; means connecting said second source to said input of said carrier generator for establishing a nominal carrier frequency to provide a first integral ratio of carrier frequency to reference frequency at a given reference frequency; integrator means having an input and an output; means connecting said input and output of said integrator means to said reference and carrier generators, respectively, for changing the carrier frequency in accordance with a change in the reference frequency to maintain said first integral ratio; comparator means for comparing the output of said integrator means and said first level; and reset means interconnecting said comparator means and said integrator means for resetting said integrator means to re-establish said nominal carrier frequency at a second integral ratio of the reference frequency when the output of said integrator means achieves a given relation to said first source level.
Claim 9
Dependent Claim
227 words
An inverter for controlling thyristor means with a reference and a carrier wave form, comprising in combinaton: a first source for establishing a first level; a reference generator circuit connected to said first source for generating the reference wave form with a reference frequency determined by said first level; a carrier generator having an input, said carrier generator generating the carrier wave form at a frequency in accordance with the level at said input of said carrier generator; a second source for establishing a second level; means connecting said second source to said input of said carrier generator for establishing a nominal carrier frequency to provide a first integral ratio of carrier frequency to reference frequency at a given reference frequency; integrator means having an input and an output; means connecting said input and output of said integrator means to said reference and carrier generators, respectively, for changing the carrier frequency in accordance with a change in the reference frequency to maintain said first integral ratio; comparator means for comparing the output of said integrator means and said first level; and reset means interconnecting said comparator means and said integrator means for resetting said integrator means to re-establish said nominal carrier frequency at a second integral ratio of the reference frequency when the output of said integrator means achieves a given relation to said first source level.
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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 |