US3757197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amping voltage on series compensating capacitor series parallel compensated current source inverter with means for cl
Assignee: General Electric Co
•
Filing: 1972-07-25
•
Granted: 1973-09-04
•
Expires: 1992-07-25
Abstract
Abstract In a current source inverter including a series compensating capacitor for supplying energy to a tank load and associated control circuit establishing a start up mode and a steady state mode of inverter operation, the former being a transitory mode of operation during which the inverter changes from a non-operating state to steady state operation, circuity is provided for clamping the voltage on the compensating capacitor to a very low magnitude at the end of the start up mode and during the steady state mode.
Inventors
- 👤 R Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:23
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/517
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
In an electric power conversion system including a current source inverter for supplying energy to a tank load comprising a bridge circuit having first and second current paths, each of said paths including first and second thyristors, said load being connected in series with a compensating capacitor of relatively low capacitance between the first and second thyristors in each path, and control means operative for actuating the inverter from a non-operating, OFF, state and for controlling its operation once actuated, said control means establishing a transitory start up mode of operation in which the inverter changes from its OFF state to a steady state mode of operation during which alternating current flows through the load via the alternate conduction of said current paths, the improvement comprising: means for clamping the voltage appearing on the compensating capacitor to a very low magnitude in the beginning of the steady state mode of operation and for keeping the voltage thereon clamped throughout said steady state mode of operation.
Claim 2
Dependent Claim
165 words
In an electric power conversion system including a current source inverter for supplying energy to a tank load comprising a bridge circuit having first and second current paths, each of said paths including first and second thyristors, said load being connected in series with a compensating capacitor of relatively low capacitance between the first and second thyristors in each path, and control means operative for actuating the inverter from a non-operating, OFF, state and for controlling its operation once actuated, said control means establishing a transitory start up mode of operation in which the inverter changes from its OFF state to a steady state mode of operation during which alternating current flows through the load via the alternate conduction of said current paths, the improvement comprising: means for clamping the voltage appearing on the compensating capacitor to a very low magnitude in the beginning of the steady state mode of operation and for keeping the voltage thereon clamped throughout said steady state mode of operation.
Claim 3
Dependent Claim
58 words
The system as specified in claim 1 wherein said voltage clamping means comprises electric switch means connected in shunt with said capacitor, said switch means being in a non-conductive state prior to steady state operation, and further control means for actuating said switch means to a conductive state in the beginning of said steady state mode of operation.
Claim 4
Dependent Claim
49 words
The system as specified in claim 2 wherein said further control means also comprises means for monitoring the voltage appearing on the load and for enabling said actuating means to render said switch conductive when the load voltage attains a predetermined magnitude at the beginning of steady state operation.
Claim 5
Dependent Claim
24 words
The system as specified in claim 2 wherein said switch means comprises first and second thyristors connected in inverse parallel relationship with one another.
Claim 6
Dependent Claim
104 words
The system as specified in claim 4 wherein said further control means also comprises first means for monitoring the voltage appearing on the load and for enabling the operation of the actuating means when the load voltage attains a predetermined magnitude and second means for monitoring the polarity of the voltage appearing on the compensating capacitor and for causing the enabled actuating means to supply a trigger signal to said first thyristor prior to the point in time when said thyristor is forward biased, whereupon said thyristor becomes conductive when forward biased to clamp the voltage appearing on said capacitor to a low magnitude.
Claim 7
Dependent Claim
67 words
The system as specified in claim 5 wherein said second means thereafter causes the enabled actuating means to supply a trigger signal to said second thyristor after said first thyristor becomes conductive and prior to the point in time when said second thyristor is forward biased, whereupon said second thyristor becomes conductive when forward biased to clamp the voltage appearing on said capacitor to a low magnitude.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |