US4320445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate control circuit for thyristor converter
Assignee: Toshiba Corp
•
Filing: 1980-09-05
•
Granted: 1982-03-16
•
Expires: 2000-09-05
Abstract
Abstract In a gate control circuit for a thyristor converter, in which thyristor valves each having a plurality of series thyristors are connected to form a bridge, a detector for detecting a forward voltage applied across one of the thyristors and a circuit for supplying a gate signal to the gate of that thyristor valve are provided. The gate control circuit further comprises a circuit for supplying, when a bypass pair operation of the thyristor converter is switched over to a deblock operation, a signal to the gate of a continually conductive thyristor valve according to a control signal to a thyristor valve to be operated in deblock with the continually conductive thyristor valve and also a gate signal to the continually conductive thyristor valve.
Inventors
- 👤 Sumio Kobayashi
- 👤 Tadashi Takahashi
- 👤 Hidetoshi Ino
- 👤 Takami Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
200 words
A gate control circuit for a thyristor converter which includes bridge means including arms individually constituted by respective thyristor valves each having a plurality of thyristors connected in series and phase control means for producing a signal commanding the conduction of the individual thyristor valves in the bridge means and said converter is operated in a bypass pair operation mode at the time of the start before being switched over to a deblock operation mode comprising: detecting means connected across the anode-to-cathode path of at least one of the thyristors in one of the thyristor valves in said bridge means for producing a detection signal corresponding to the anode-to-cathode voltage across said one of the thyristors; first means connected to said phase control means and detecting means for producing a first gate signal according to the detection signal and a first signal commanding the conduction of the thyristor valve connected to said detecting means; and second means connected to said phase control means for producing a second gate signal according to the first gate signal and a second signal commanding the conduction of the thyristor valve to be operated for deblocking with the thyristor valve connected to said detecting means.
Claim 2
Dependent Claim
200 words
A gate control circuit for a thyristor converter which includes bridge means including arms individually constituted by respective thyristor valves each having a plurality of thyristors connected in series and phase control means for producing a signal commanding the conduction of the individual thyristor valves in the bridge means and said converter is operated in a bypass pair operation mode at the time of the start before being switched over to a deblock operation mode comprising: detecting means connected across the anode-to-cathode path of at least one of the thyristors in one of the thyristor valves in said bridge means for producing a detection signal corresponding to the anode-to-cathode voltage across said one of the thyristors; first means connected to said phase control means and detecting means for producing a first gate signal according to the detection signal and a first signal commanding the conduction of the thyristor valve connected to said detecting means; and second means connected to said phase control means for producing a second gate signal according to the first gate signal and a second signal commanding the conduction of the thyristor valve to be operated for deblocking with the thyristor valve connected to said detecting means.
Claim 3
Dependent Claim
49 words
A gate control circuit according to claim 1, wherein said detecting means includes a light-emitting element for emitting light when the thyristor forward voltage exceeds a predetermined value, and a photoelectric converter for receiving light from said light-emitting element and producing an output signal according to the received light.
Claim 4
Dependent Claim
79 words
A gate control circuit according to claim 1, which further comprises third means including a light-emitting element connected to the first and second means for emitting light according to either one of said first and second gate signals, and a photoelectric converter connected to the gates of all the thyristors in the thyristor valve connected to said detecting means for receiving light from said light-emitting element and for supplying a signal to the gates according to the received light.
Claim 5
Dependent Claim
199 words
A thyristor converter operated in a bypass pair mode at the time of the start being switched over to a deblock operation mode comprising: bridge means including arms individually constituted by respective thyristor valves each having a plurality of thyristors connected in series; phase control means for producing a signal commanding the conduction of the individual thyristor valves in said bridge means according to the phase of an AC signal supplied to said bridge means; detecting means connected across the anode-to-cathode path of at least one of the thyristors in one of the thyristor valves in said bridge means for producing a detection signal corresponding to the anode-to-cathode voltage across said one of the thyristors; first means connected to said phase control means and detecting means for producing a first gate signal according to the detection signal and a first signal commanding the conduction of the thyristor valve connected to said detecting means; and second means connected to said phase control means for producing a second gate signal according to the first gate signal and a second signal commanding the conduction of the thyristor valve to be operated for deblocking with the thyristor valve connected to said detecting means.
Claim 6
Dependent Claim
199 words
A thyristor converter operated in a bypass pair mode at the time of the start being switched over to a deblock operation mode comprising: bridge means including arms individually constituted by respective thyristor valves each having a plurality of thyristors connected in series; phase control means for producing a signal commanding the conduction of the individual thyristor valves in said bridge means according to the phase of an AC signal supplied to said bridge means; detecting means connected across the anode-to-cathode path of at least one of the thyristors in one of the thyristor valves in said bridge means for producing a detection signal corresponding to the anode-to-cathode voltage across said one of the thyristors; first means connected to said phase control means and detecting means for producing a first gate signal according to the detection signal and a first signal commanding the conduction of the thyristor valve connected to said detecting means; and second means connected to said phase control means for producing a second gate signal according to the first gate signal and a second signal commanding the conduction of the thyristor valve to be operated for deblocking with the thyristor valve connected to said detecting means.
Claim 7
Dependent Claim
48 words
A thyristor converter according to claim 4, wherein said detecting means includes a light-emitting element for emitting light when the thyristor forward voltage exceeds a predetermined value, and a photoelectric converter for receiving light from said light-emitting element and producing an output signal according to said received light.
Claim 8
Dependent Claim
78 words
A thyristor converter according to claim 4, which further comprises third means including a light-emitting element connected to said first and second means for emitting light according to either one of the first and second gate signals, and a photoelectric converter connected to the gates of all the thyristors in the thyristor valve connected to said detecting means for receiving light from said light-emitting element and for supplying a signal to the gates according to the received light.
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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |