Patent US4255675A successfully refreshed from Google Patents.
US4255675A
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Circuit arrangement for reducing the recovery time of a thyristor
Assignee: Siemens AG
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Filing: 1978-10-19
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Granted: 1981-03-10
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Expires: 1998-10-19
Abstract
Abstract Circuit arrangement for reducing recovery time of a thyristor having a control electrode, a main emitter electrode and at least one auxiliary emitter electrode disposed between the main emitter electrode and the control electrode, includes two current sources, one of which delivers a pulse of one polarity and is connected to and between the control electrode and the auxiliary emitter electrode, and the other of which delivers a pulse of the other polarity and is connected to and between the auxiliary emitter electrode and the main emitter electrode.
Inventors
- 👤 Erhard Lehmann
- 👤 Peter Wojtalla
- 👤 Peter Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:40
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/06; H03; H03K; H03K17/00; H03K17/04; H03K17/0403; H10; H10D; H10D18/00; H10D18/221
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
Circuit arrangement for reducing recovery time of a thyristor having a control electrode, a main emitter electrode and at least one auxiliary emitter electrode disposed between the main emitter electrode and the control electrode, comprising two current sources, one of which delivers a pulse of one polarity and is connected to and between the control electrode and the auxiliary emitter electrode, and the other of which delivers a pulse of the other polarity and is connected to and between the auxiliary emitter electrode and the main emitter electrode, and transformer means through which the current sources are connected to the respective electrodes.
Claim 2
Dependent Claim
102 words
Circuit arrangement for reducing recovery time of a thyristor having a control electrode, a main emitter electrode and at least one auxiliary emitter electrode disposed between the main emitter electrode and the control electrode, comprising two current sources, one of which delivers a pulse of one polarity and is connected to and between the control electrode and the auxiliary emitter electrode, and the other of which delivers a pulse of the other polarity and is connected to and between the auxiliary emitter electrode and the main emitter electrode, and transformer means through which the current sources are connected to the respective electrodes.
Claim 3
Dependent Claim
44 words
Circuit arrangement according to claim 1 including a diode through which said other current source is connected to and between the main emitter electrode and the auxiliary emitter electrode, said diode being polarized so that said diode blocks the pulse of said one polarity.
Claim 4
Dependent Claim
126 words
Circuit arrangement for reducing recovery time of a thyristor having a control electrode, a main emitter electrode and at least one auxiliary emitter electrode disposed between the main emitter electrode and the control electrode, comprising two current sources, one of which delivers a pulse of one polarity and is connected to and between the control electrode and the auxiliary emitter electrode, and the other of which delivers a pulse of the other polarity and is connected to and between the auxiliary emitter electrode and the main emitter electrode, and a diode through which said other current source is connected to and between the main emitter electrode and the auxiliary emitter electrode, said diode being polarized so that said diode blocks the pulse of said one polarity.
Claim 5
Dependent Claim
126 words
Circuit arrangement for reducing recovery time of a thyristor having a control electrode, a main emitter electrode and at least one auxiliary emitter electrode disposed between the main emitter electrode and the control electrode, comprising two current sources, one of which delivers a pulse of one polarity and is connected to and between the control electrode and the auxiliary emitter electrode, and the other of which delivers a pulse of the other polarity and is connected to and between the auxiliary emitter electrode and the main emitter electrode, and a diode through which said other current source is connected to and between the main emitter electrode and the auxiliary emitter electrode, said diode being polarized so that said diode blocks the pulse of said one polarity.
References Cited (Backward Citations)
US4110638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |