US3854076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual level plugging circuit
Assignee: General Electric Co
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Filing: 1973-11-19
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Granted: 1974-12-10
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Expires: 1993-11-19
Abstract
Abstract A circuit for selectively diminishing the conductive interval of a pulse control circuit during plugging of a d.c. motor drive system. A thyristor is utilized to bypass a portion of an inductive winding in the charge reversal circuit of a commutating capacitor. The voltage on the capacitor then reverses itself in a shorter than normal time to allow a more rapid commutation of a main thyristor.
Inventors
- 👤 J Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:10
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
In a pulse control system for an electric vehicle including a first thyristor for coupling a traction motor to a source of electric potential and a circuit for commutating the first thyristor after a predetermined time including a capacitor, an inductive winding and second and third thyristors, said second thyristor being energizable to couple said capacitor in circuit with the source of electric potential to allow the capacitor to charge in a first direction, and said third thyristor being energizable to allow the charge impressed upon said capacitor to flow through said inductive winding to reverse the polarity of capacitor charge, the improvement comprising a fourth thyristor coupled in said circuit and energizable to conduct charge from said capacitor about a portion of said inductive winding.
Claim 2
Dependent Claim
126 words
In a pulse control system for an electric vehicle including a first thyristor for coupling a traction motor to a source of electric potential and a circuit for commutating the first thyristor after a predetermined time including a capacitor, an inductive winding and second and third thyristors, said second thyristor being energizable to couple said capacitor in circuit with the source of electric potential to allow the capacitor to charge in a first direction, and said third thyristor being energizable to allow the charge impressed upon said capacitor to flow through said inductive winding to reverse the polarity of capacitor charge, the improvement comprising a fourth thyristor coupled in said circuit and energizable to conduct charge from said capacitor about a portion of said inductive winding.
Claim 3
Dependent Claim
25 words
The invention defined in claim 1, wherein the series combination of said second thyristor and said capacitor is coupled in shunt about said first thyristor.
Claim 4
Dependent Claim
26 words
The invention defined in claim 2, wherein the series combination of said third thyristor and said inductive winding are coupled in shunt with said second thyristor.
Claim 5
Dependent Claim
25 words
The invention defined in claim 2, wherein the series combination of said third thyristor and said inductive winding are coupled in shunt with said capacitor.
Claim 6
Dependent Claim
98 words
In an electric vehicle control including a first thyristor adapted to electrically connect a traction motor to a source of electric potential, and means for adjustably controlling the rate of conduction of said thyristor, means for commutating the first thyristor comprising: a capacitor; a second thyristor for coupling said capacitor across first thyristor; a third thyristor; an inductive winding; means coupling said third thyristor and said inductive winding to said capacitor; a fourth thyristor energizable to bypass a portion of said inductive winding; and means responsive to the plugging of the traction motor to energize said fourth thyristor.
Claim 7
Dependent Claim
98 words
In an electric vehicle control including a first thyristor adapted to electrically connect a traction motor to a source of electric potential, and means for adjustably controlling the rate of conduction of said thyristor, means for commutating the first thyristor comprising: a capacitor; a second thyristor for coupling said capacitor across first thyristor; a third thyristor; an inductive winding; means coupling said third thyristor and said inductive winding to said capacitor; a fourth thyristor energizable to bypass a portion of said inductive winding; and means responsive to the plugging of the traction motor to energize said fourth thyristor.
Claim 8
Dependent Claim
25 words
The invention defined in claim 5, wherein said fourth thyristor is coupled in parallel with said third thyristor and a portion of said inductive winding.
Claim 9
Dependent Claim
11 words
The invention defined in claim 6, wherein said thyristors are SCRs.
Claim 10
Dependent Claim
17 words
The invention defined in claim 7, wherein said inductive winding comprises the secondary winding of a transformer.
Claim 11
Dependent Claim
26 words
The invention defined in claim 5, wherein said third thyristor is coupled betweeen one end of said inductive winding to a point intermediate the ends thereof.
Claim 12
Dependent Claim
11 words
The invention defined in claim 9, wherein said thyristors are SCRs.
Claim 13
Dependent Claim
13 words
The invention defined in claim 10, wherein said inductive winding comprises a reactor.
Claim 14
Dependent Claim
17 words
The invention defined in claim 10, wherein said inductive winding is the secondary winding of a transformer.
Claim 15
Dependent Claim
98 words
Control means for an electric vehicle, comprising: a first thyristor for controllably coupling a traction motor to a source of electric potential; means for repeatedly gating said thyristor to vary the effective potential applied to the motor; means connecting the series combination of inductive means, a second thyristor and a capacitor in shunt with said first thyristor; a third thyristor coupling the intersection of said capacitor and said inductive means to the anode of said first thyristor; and a fourth thyristor coupling said one side of said capacitor to a point intermediate the ends of said inductive means.
Claim 16
Dependent Claim
98 words
Control means for an electric vehicle, comprising: a first thyristor for controllably coupling a traction motor to a source of electric potential; means for repeatedly gating said thyristor to vary the effective potential applied to the motor; means connecting the series combination of inductive means, a second thyristor and a capacitor in shunt with said first thyristor; a third thyristor coupling the intersection of said capacitor and said inductive means to the anode of said first thyristor; and a fourth thyristor coupling said one side of said capacitor to a point intermediate the ends of said inductive means.
Claim 17
Dependent Claim
106 words
Control means for an electric vehicle, comprising: a first thyristor for controllably coupling a traction motor to a soUrce of electric potential; means for repeatedly gating said first thyristor to vary the effective potential applied to the traction motor; a capacitor; a second thyristor and an inductive means coupled across said capacitor for reversing a potential accrued thereon; a third thyristor coupling a point intermediate the traction motor and the first thyristor to one side of said capacitor for impressing a potential upon said capacitor; and a fourth thyristor coupling said one side of said capacitor to a point intermediate the ends of said inductive means.
Claim 18
Dependent Claim
106 words
Control means for an electric vehicle, comprising: a first thyristor for controllably coupling a traction motor to a soUrce of electric potential; means for repeatedly gating said first thyristor to vary the effective potential applied to the traction motor; a capacitor; a second thyristor and an inductive means coupled across said capacitor for reversing a potential accrued thereon; a third thyristor coupling a point intermediate the traction motor and the first thyristor to one side of said capacitor for impressing a potential upon said capacitor; and a fourth thyristor coupling said one side of said capacitor to a point intermediate the ends of said inductive means.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |