US3775666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulator for synchronous generators
Assignee: GEC AUTOMATION PROJECTS Inc
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Filing: 1972-04-24
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Granted: 1973-11-27
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Expires: 1992-04-24
Abstract
Abstract An accurate, stable, and inexpensive voltage regulator for single or multiple phase synchronous generators. A monolithic integrated circuit comprising reference and error amplifiers establishes a stable output reference voltage. A comparator amplifier compares the reference voltage with a sensed output voltage of the generator and provides an excitation signal to a charging circuit in response thereto. Upon reaching a predetermined charging level, the charging circuit discharges through a unijunction transistor triggering circuit and enables the input gates of a pair of silicon controlled rectifiers configured in opposite legs of an AC bridge circuit. When enabled, each silicon controlled rectifier will conduct during that half cycle of the bridge AC excitation signal in which it is forward biased and will thereby energize the field or the exciter windings of the generator. A voltage or current feedback network from the generator or exciter field winding to the integrated reference circuit stabilizes the reference circuit against hunting.
Inventors
- 👤 F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:15
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
259 words
An improved voltage regulator for synchronous generators comprising: a. sensing means operable to produce a DC sensed output signal proportional to an electrical signal applied to its input; B. means connecting the input of said sensing means to receive an output voltage signal of a generator; c. voltage reference means having a power input for producing a reference signal when an energizing signal is applied to its power input, wherein said voltage reference means includes temperature compensated amplifier means operative to maintain the amplitude of said reference signal constant over ambient temperature changes; d. comparator/triggering circuit means having first and second inputs connected to respectively receive said sensed output and said reference signals, and operable to compare the received sensed output and reference signals for providing an output triggering signal in response thereto; e. current control means having output terminal means adapted to be connected to a field winding of said generator, said current control means being connected to receive said triggering signal and operable to provide to said output terminal means a controlled current signal responsive to said received triggering signal; f. means connecting a field winding of said generator to said output terminal means and operable to receive said controlled current signal and to energize the field winding therewith; and g. synchronizer means operatively connecting the power input of said voltage reference means with said current control means, said sychronizer means being operable to apply an energizing signal to the power input of said voltage reference means in synchronism with the operation of said current control means.
Claim 2
Dependent Claim
259 words
An improved voltage regulator for synchronous generators comprising: a. sensing means operable to produce a DC sensed output signal proportional to an electrical signal applied to its input; B. means connecting the input of said sensing means to receive an output voltage signal of a generator; c. voltage reference means having a power input for producing a reference signal when an energizing signal is applied to its power input, wherein said voltage reference means includes temperature compensated amplifier means operative to maintain the amplitude of said reference signal constant over ambient temperature changes; d. comparator/triggering circuit means having first and second inputs connected to respectively receive said sensed output and said reference signals, and operable to compare the received sensed output and reference signals for providing an output triggering signal in response thereto; e. current control means having output terminal means adapted to be connected to a field winding of said generator, said current control means being connected to receive said triggering signal and operable to provide to said output terminal means a controlled current signal responsive to said received triggering signal; f. means connecting a field winding of said generator to said output terminal means and operable to receive said controlled current signal and to energize the field winding therewith; and g. synchronizer means operatively connecting the power input of said voltage reference means with said current control means, said sychronizer means being operable to apply an energizing signal to the power input of said voltage reference means in synchronism with the operation of said current control means.
Claim 3
Dependent Claim
119 words
An improved voltage regulator for synchronous generators according to claim 1, including stabilizing circuit means connected to said output terminal means and operable to monitor electrical signals thereat and to produce a stabilizing feedback output signal in response thereto; and wherein said voltage reference means comprises: a. temperature compensated amplifier means operable to produce a regulated voltage signal; and b. error amplifier means having a non-inverting input operatively connected to receive said regulated voltage and said stabilizing feedback output signals and having an inverting input operatively connected by a feedback circuit to an output of said error amplifier, wherein said error amplifier operatively produces said reference signal in response to the signals applied to its inverting and non-inverting inputs.
Claim 4
Dependent Claim
34 words
An improved voltage regulator for synchronous generators according to claim 2, wherein said temperature compensated amplifier means, said error amplifier means and said feedback means are substantially formed in a single monolithic integrated circuit.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |