US3681677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for starting of thyristors,including the adjustment of the leading edge of the control pulse on the primary end of an impulse treatment
Assignee: CKD Praha DIZ AS
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Filing: 1971-07-07
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Granted: 1972-08-01
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Expires: 1991-07-07
Abstract
Abstract An arrangement for starting of thyristors providing a steep leading edge of the control pulse having an impulse transformer transforming the first part of the actuating pulse by a part of the primary winding of the transformer at a higher ratio of transformation, than the second part of the control pulse which is transformed by the whole primary winding, using a capacitor and a diode for controlling this process.
Inventors
- 👤 Jiri Badal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:33
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/12; H03K17/00; H03K17/51; H03K17/56; H03K17/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
An arrangement for starting of thyristors including the adjustment of the leading edge of the control pulse, comprising in combination an impulse transformer having two primary windings connected in series and a secondary winding, a thyristor, a resistor, a diode, a capacitor, a source of DC supply voltage, switch means, the secondary winding of the impulse transformer connected to the cathode and to the control electrode of the thyristor, the start of the first primary winding of the impulse transformer connected to the positive terminal of the source of DC supply voltage by way of the capacitor, the end of the first primary winding connected to the switch means, the end of the second primary winding connected with the start of the first primary winding, the start of the second primary winding connected over a series combination of the resistor and diode to the positive terminal of the source of DC supply voltage, the diode connected to this positive terminal of the DC supply voltage with its anode.
Claim 2
Dependent Claim
168 words
An arrangement for starting of thyristors including the adjustment of the leading edge of the control pulse, comprising in combination an impulse transformer having two primary windings connected in series and a secondary winding, a thyristor, a resistor, a diode, a capacitor, a source of DC supply voltage, switch means, the secondary winding of the impulse transformer connected to the cathode and to the control electrode of the thyristor, the start of the first primary winding of the impulse transformer connected to the positive terminal of the source of DC supply voltage by way of the capacitor, the end of the first primary winding connected to the switch means, the end of the second primary winding connected with the start of the first primary winding, the start of the second primary winding connected over a series combination of the resistor and diode to the positive terminal of the source of DC supply voltage, the diode connected to this positive terminal of the DC supply voltage with its anode.
Claim 3
Dependent Claim
26 words
An arrangement as in claim 1 comprising a screening foil of the secondary winding of the impulse transformer connected with the source of DC supply voltage.
Claim 4
Dependent Claim
29 words
An arrangement as in claim 1, the distance of the primary winding of the impulse transformer from its secondary winding being smaller than that of the second primary winding.
Claim 5
Dependent Claim
35 words
An arrangement as in claim 1, the number of turns of the primary winding of the impulse transformer being 0.5 to 5 times the number of turns of the secondary winding of the impulse transformer.
Claim 6
Dependent Claim
32 words
An arrangement as in claim 4 the number of turns of the second primary winding being 0.5 to 20 times the number of turns of the secondary winding of the impulse transformer.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |