US3567972A
Expired / Lapsed
US
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Arrangement for igniting series connected power thyristors by means of auxiliary thyristor circuit controlled by light-sensitive elements
Assignee: BBC Brown Boveri AG Germany
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Filing: 1968-09-18
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Granted: 1971-03-02
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Expires: 1988-09-18
Abstract
Abstract An arrangement for igniting each of a plurality of series connected power thyristors of a high voltage operating circuit comprises a plurality of auxiliary thyristors arranged in series and connected between the anode side of the power thyristor and its control electrode. The auxiliary thyristors require relatively small operating current for their ignition and the necessary ignition current is supplied by light-sensitive control elements connected to the control electrodes of the auxiliary transistors. The light-sensitive control elements can be of any suitable type such as photodiodes, phototransistors and photoresistors.
Inventors
- 👤 Werner Faust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H02; H02M; H02M1/00; H02M1/08; H02M1/088
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
An arrangement for igniting each of a plurality of series connected power thyristors comprising a plurality of auxiliary thyristors arranged in series and connected between the anode side of each said power thyristor and its control electrode, and light-sensitive control elements individually connected to each said auxiliary thyristor and connected in a circuit with the control electrode thereof, and illumination means impinging upon said light-sensitive control elements for effecting simultaneous ignition of said auxiliary thyristors and hence simultaneous ignition of said power thyristors.
Claim 2
Dependent Claim
83 words
An arrangement for igniting each of a plurality of series connected power thyristors comprising a plurality of auxiliary thyristors arranged in series and connected between the anode side of each said power thyristor and its control electrode, and light-sensitive control elements individually connected to each said auxiliary thyristor and connected in a circuit with the control electrode thereof, and illumination means impinging upon said light-sensitive control elements for effecting simultaneous ignition of said auxiliary thyristors and hence simultaneous ignition of said power thyristors.
Claim 3
Dependent Claim
64 words
An arrangement as defined in claim 1 for igniting series connected power thyristors wherein said light-sensitive control elements are constituted by light-sensitive diodes, each said light-sensitive diode being connected in series opposition with a diode insensitive to light thus to form a diode pair which is arranged in series with other diode pairs across the anode, cathode and control electrodes of said auxiliary thyristors.
Claim 4
Dependent Claim
101 words
An arrangement as defined in claim 1 for igniting series connecting power thyristors wherein said light-sensitive control elements are phototransistors, each said phototransistor having its collector-emitter circuit connected in series with a resistor between the anode and cathode sides of the associated auxiliary thyristor, a first diode having its anode side connected to the collector which is also connected to the cathode of the associated auxiliary thyristor and its cathode side connected to the emitter, and a second diode having its anode side connected to the emitter and its cathode side connected to the control electrode of the associated auxiliary thyristor.
Claim 5
Dependent Claim
65 words
An arrangement as defined in claim 1 for igniting series connected power thyristors wherein said light-sensitive control elements are phototransistors, each said phototransistor having its collector connected to the control electrode of the associated auxiliary thyRistor and its emitter connected to the junction between a resistor and a Zener diode arranged in a series circuit between the cathode and anode sides of the auxiliary thyristor.
Claim 6
Dependent Claim
37 words
An arrangement as defined in claim 1 for igniting series connected power thyristors wherein said light-sensitive control elements are phototransistors having their emitter-collector circuits connected between the anode side and control electrode of the associated auxiliary thyristor.
Claim 7
Dependent Claim
33 words
An arrangement as defined in claim 1 for igniting series connected power thyristors wherein said light-sensitive control elements are photoresistors connected between the anode side and control electrode of the associated auxiliary thyristor.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |