US3599080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternator voltage regulator having auxilliary excitation means
Assignee: Stone Platt Crawley Ltd
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Filing: 1969-12-01
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Granted: 1971-08-10
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Expires: 1989-12-01
Abstract
Abstract Apparatus for regulating the field current of an alternator comprises a negative feedback circuit and thyristor means by which the field current is turned on and off, wherein auxiliary, sensitive, thyristors which are capable of functioning at the low alternator voltages produced by residual magnetism on starting are provided in shunt with main thyristors which take over when the alternator voltage has built up.
Inventors
- 👤 David Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:36
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/2437; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
Apparatus for regulating the field current of an alternator comprising, a negative feedback circuit, main thyristors by which the field current is turned on and off, auxiliary sensitive thyristors which are capable of functioning at the low alternator voltages produced by residual magnetism on starting of the alternator and which are arranged in shunt with said main thyristors which take over when the alternator voltage has built up, and, for reducing the response time of the apparatus, a Zener diode so connected to the field that the latter can regenerate through the said diode when the field current is turned off.
Claim 2
Dependent Claim
101 words
Apparatus for regulating the field current of an alternator comprising, a negative feedback circuit, main thyristors by which the field current is turned on and off, auxiliary sensitive thyristors which are capable of functioning at the low alternator voltages produced by residual magnetism on starting of the alternator and which are arranged in shunt with said main thyristors which take over when the alternator voltage has built up, and, for reducing the response time of the apparatus, a Zener diode so connected to the field that the latter can regenerate through the said diode when the field current is turned off.
Claim 3
Dependent Claim
92 words
Apparatus for regulating the field current of an alternator comprising, a negative feedback circuit, main thyristors by which the field current is turned on and off, auxiliary sensitive thyristors which are capable of functioning at the low alternator voltages produced by residual magnetism on starting of the alternator and which are arranged in shunt with said main thyristors which take over when the alternator voltage has built up, and, for reducing the response time of the apparatus, means forcing the field current to decay rapidly by the application of a reversed voltage.
Claim 4
Dependent Claim
92 words
Apparatus for regulating the field current of an alternator comprising, a negative feedback circuit, main thyristors by which the field current is turned on and off, auxiliary sensitive thyristors which are capable of functioning at the low alternator voltages produced by residual magnetism on starting of the alternator and which are arranged in shunt with said main thyristors which take over when the alternator voltage has built up, and, for reducing the response time of the apparatus, means forcing the field current to decay rapidly by the application of a reversed voltage.
Claim 5
Dependent Claim
22 words
Apparatus as claimed in claim 2, wherein the thyristors are allowed to conduct during the negative half cycles of the alternator voltage.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in claim 2, wherein the thyristors are fired by pulses supplied by three logic circuits arranged to sense the required moment for firing.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |