US3891913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter
Assignee: Individual
•
Filing: 1973-04-05
•
Granted: 1975-06-24
•
Expires: 1993-04-05
Abstract
Abstract In a parallel inverter system having a transformer with a commutating capacitor connected across its centre-tapped primary, a second commutating capacitor is connected in series with the first, an additional centre tapped auxiliary winding is provided on the transformer, and an auxiliary thyristor is provided between the junction of the said capacitors and the junction of the main thyristor of the inverter.
Inventors
- 👤 Hattangady Vasanth Rao
- 👤 Ravindra Nath Doss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:03
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
284 words
A parallel inverter comprising: a transformer having primary, auxiliary and secondary windings closely coupled to each other, said secondary winding serving as AC output means, said primary winding divided into two equal portions, said two portions joined at a common centre point, said auxiliary winding divided into two equal portions, said two portions joined at a common centre point, a D.C. source having a live terminal and a return terminal, the live terminal connected to the centre point of the said primary winding, a pair of series connected first and second thyristors having their like terminals, such as cathodes or anodes, connected together and their remaining terminals, such as anodes or cathodes, connected across the said primary winding, an inductor connected between the junction of the said first and second thyristors and the return terminal of the D.C. source, a pair of series connected first and second commutating capacitors connected across the said primary winding, a third thyristor connected between the junction of the said commutating capacitors and the junction of the said first and second thyristors, all three thyristors having their like terminals together, a pair of series connected diodes having their like terminals, such as cathodes or anodes connected together and their remaining terminals, such as anodes or cathodes, connected across the said auxiliary winding, with common centre point of the said auxiliary winding and the junction of the said diodes electrically bridged across the said third thyristor and said inductor in series, the conducting directions of the said diodes and the said third thyristor being same around the loop so formed, and a control circuit to which the gates and cathodes of the said first, second and third thyristors are connected.
Claim 2
Dependent Claim
284 words
A parallel inverter comprising: a transformer having primary, auxiliary and secondary windings closely coupled to each other, said secondary winding serving as AC output means, said primary winding divided into two equal portions, said two portions joined at a common centre point, said auxiliary winding divided into two equal portions, said two portions joined at a common centre point, a D.C. source having a live terminal and a return terminal, the live terminal connected to the centre point of the said primary winding, a pair of series connected first and second thyristors having their like terminals, such as cathodes or anodes, connected together and their remaining terminals, such as anodes or cathodes, connected across the said primary winding, an inductor connected between the junction of the said first and second thyristors and the return terminal of the D.C. source, a pair of series connected first and second commutating capacitors connected across the said primary winding, a third thyristor connected between the junction of the said commutating capacitors and the junction of the said first and second thyristors, all three thyristors having their like terminals together, a pair of series connected diodes having their like terminals, such as cathodes or anodes connected together and their remaining terminals, such as anodes or cathodes, connected across the said auxiliary winding, with common centre point of the said auxiliary winding and the junction of the said diodes electrically bridged across the said third thyristor and said inductor in series, the conducting directions of the said diodes and the said third thyristor being same around the loop so formed, and a control circuit to which the gates and cathodes of the said first, second and third thyristors are connected.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |