US3667021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series motor control circuit using thyristors energized by direct current
Assignee: General Electric Co
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Filing: 1970-09-11
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Granted: 1972-05-30
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Expires: 1990-09-11
Abstract
Abstract A commutation control circuit for a motor including a power thyristor and an auxiliary thyristor for switching the power thyristor under control of a variable frequency pulse generator making use of a capacitor for commutation charged by a transformer, the charge on the capacitor being established to be ready for commutation whenever the power thyristor is gated, and the charging current being derived from a direct current source such as a lead/acid storage battery. The circuit specifically uses a positive pulse for causing conduction of the power thyristor and a negative pulse for switching the power thyristor ''''off.
Inventors
- 👤 Albert W Anderson
- 👤 Charles E Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M1/00; H02M1/06; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A controlled, commutating circuit for a power thyristor including a commutating capacitor, an auxiliary thyristor, and circuit means connected to said power thyristor and to said auxiliary thyristor operative to render each of said thyristors selectively conductive; said circuit means responsive to a signal of a first identity applied in an input thEreof for rendering said auxiliary thyristor conductive to charge said capacitor in a first direction and for rendering said main thyristor conductive after an identifiable period to reverse the charge on said capacitor, and responsive to a signal of a second identity applied to said input to render only said auxiliary thyristor conductive to thereby utilize the reverse charge on said capacitor to switch said main to a non-conductive state.
Claim 2
Dependent Claim
122 words
A controlled, commutating circuit for a power thyristor including a commutating capacitor, an auxiliary thyristor, and circuit means connected to said power thyristor and to said auxiliary thyristor operative to render each of said thyristors selectively conductive; said circuit means responsive to a signal of a first identity applied in an input thEreof for rendering said auxiliary thyristor conductive to charge said capacitor in a first direction and for rendering said main thyristor conductive after an identifiable period to reverse the charge on said capacitor, and responsive to a signal of a second identity applied to said input to render only said auxiliary thyristor conductive to thereby utilize the reverse charge on said capacitor to switch said main to a non-conductive state.
Claim 3
Dependent Claim
32 words
The invention set forth in claim 1 including the provision of positive pulse means for initiating conduction of said power thyristor and negative pulse means for initiating non-conduction of the power thyristor.
Claim 4
Dependent Claim
18 words
The invention according to claim 1 wherein the said circuit means includes an auto transformer capable of saturation.
Claim 5
Dependent Claim
37 words
The invention according to claim 1 wherein the said circuit means includes a saturable transformer for initiating the conduction of the auxiliary thyristor prior to initiating conduction of the power thyristor under control of a positive pulse.
Claim 6
Dependent Claim
36 words
The invention according to claim 1 wherein the said circuit means includes control means for preventing initiation of conduction of said power thyristor when said auxiliary thyristor''s conduction is initiated under control of a negative pulse.
Claim 7
Dependent Claim
15 words
The invention in accordance with claim 1 wherein the signals are of relatively opposite polarity.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |