US3842337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor rectifier having a device for self-ignition or recovery protection
Assignee: ABB Norden Holding AB
•
Filing: 1973-06-18
•
Granted: 1974-10-15
•
Expires: 1993-06-18
Abstract
Abstract A thyristor rectifier for high voltage includes a number of series-connected thyristors with a control device for each thyristor and a control circuit for the whole rectifier connected to the control devices. There is a control pulse emitter in each control device which emits an indicating pulse when the voltage over the corresponding thyristor in the conducting direction amounts to a certain value. A protection device is provided which emits a signal for the whole rectifier through a control pulse transmitter if a voltage grows in the conducting direction of the rectifier at a time when only an insufficient number of thyristors have regained their blocking ability. This protection device includes a memory circuit and a counter to register the indicating pulses from the emitters of the control devices and an output circuit connected between the counter and the control pulse transmitter which emits a signal for ignition of the whole thyristor in dependence on a predetermined number of indicating pulses.
Inventors
- 👤 A Ekstrom
- 👤 K Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:16
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/092; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1203; H02H7/1206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
207 words
Thyristor rectifier for high voltage comprising a number of series-connected thyristors (13-1n) each provided with a control device (1), and a control circuit (23,8,9) for the whole rectifier, a control pulse transmitter (8,9) in the control circuit for controlling the control devices, each control device including means (12) for emitting an indicating pulse when the voltage over the corresponding thyristor in the conducting direction amounts to a certain value, and the thyristor rectifier being provided with a device for self-ignition protection for the thyristors, said protection device including means to emit a signal for ignition of the whole rectifier through the control pulse transmitter if a voltage grows in the conducting direction of the rectifier at a time when only an insufficient number of thyristors have regained their blocking ability, said selfignition protection comprising a memory circuit (10) and a counter (5) to register said indicating pulses from the signal emitting means (12) of the control devices (1) and an output circuit (7 or 25 or 105) for the protection device connected between said counter (5) and said control pulse transmitter (8,9), said output circuit including means to emit a signal for ignition of the whole thyristor rectifier in dependence on a predetermined number of indicating pulses.
Claim 2
Dependent Claim
207 words
Thyristor rectifier for high voltage comprising a number of series-connected thyristors (13-1n) each provided with a control device (1), and a control circuit (23,8,9) for the whole rectifier, a control pulse transmitter (8,9) in the control circuit for controlling the control devices, each control device including means (12) for emitting an indicating pulse when the voltage over the corresponding thyristor in the conducting direction amounts to a certain value, and the thyristor rectifier being provided with a device for self-ignition protection for the thyristors, said protection device including means to emit a signal for ignition of the whole rectifier through the control pulse transmitter if a voltage grows in the conducting direction of the rectifier at a time when only an insufficient number of thyristors have regained their blocking ability, said selfignition protection comprising a memory circuit (10) and a counter (5) to register said indicating pulses from the signal emitting means (12) of the control devices (1) and an output circuit (7 or 25 or 105) for the protection device connected between said counter (5) and said control pulse transmitter (8,9), said output circuit including means to emit a signal for ignition of the whole thyristor rectifier in dependence on a predetermined number of indicating pulses.
Claim 3
Dependent Claim
97 words
Thyristor rectifier according to claim 1, in which said counter (5) includes a threshold means for emitting a signal when the number of indicating signals have reached a certain magnitude, a time signal emitter (4), said outPut circuit (7) including an AND-gate comparing the simultaneity of the signal from said counter with the signal from said time signal emitter in such a way that, if the signal from the counter (5) occurs later the signal from the time signal emitter, the output circuit emits a signal to the control pulse transmitter (8,9) to ignite the thyristor rectifier.
Claim 4
Dependent Claim
71 words
Thyristor rectifier according to claim 2, having a time signal emitter (120) which emits its signal to the output circuit (105) during a certain time after the voltage over the rectifier in its blocking direction has grown to a certain value, and means to obtain an output signal from the output circuit (105) if a signal from the counter (5) is obtained during the signal time of the time signal emitter.
Claim 5
Dependent Claim
38 words
Thyristor rectifier according to claim 2, in which the time signal emitter (4) emits a signal to the output circuit (7) having a certain delay in relation to any of said indicating pulses from the control devices (1).
Claim 6
Dependent Claim
19 words
Thyristor rectifier according to claim 4, in which said delay is counted from the first of said indicating pulses.
Claim 7
Dependent Claim
19 words
Thyristor rectifier according to claim 4, in which said delay is counted from the latest of said indicating pulses.
Claim 8
Dependent Claim
31 words
Thyristor rectifier according to claim 4, in which the length of said delay is determined in dependence on the growth of the voltage over the thyristor rectifier in its conducting direction.
Claim 9
Dependent Claim
40 words
Thyristor rectifier according to claim 1, in which the number of indicating pulses during which the output circuit (25) is to emit a signal is determined in dependence on the growing voltage over the thyristor rectifier in its conducting direction.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |