Patent US3716758A successfully refreshed from Google Patents.
US3716758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thyristor ignition control device
Assignee: Fiat SpA
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Filing: 1972-03-10
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Granted: 1973-02-13
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Expires: 1992-03-10
Abstract
Abstract A thyristor ignition control device for internal combustion engine ignition circuits. A capacitor is charged from a voltage source and discharges through the primary of a step-up transformer when a thyristor connected across the source is fired, producing a high voltage impulse at the transformer secondary to induce sparking across a gap. To limit the current through the thyristor during the initial stages of firing the transformer has a core, for example of ferrite, with a high initial reluctance, thereby reducing wear in the thyristor.
Inventors
- 👤 M Palazzetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:31
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0807; F02P3/0838; H; H01; H01F; H01F38/00; H01F38/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
Ignition control device comprising transformer having a primary and secondary winding, spark electrodes connected across said secondary winding, a capacitor in series with said primary winding, means connecting a continuous voltage source across the series combination of said capacitor and transformer primary winding to charge said capacitor, and a thyristor connected in parallel with said series combination, control electrode means for firing said thyristor thereby causing discharge of said capacitor through said transformer primary winding, said transformer having a core of high initial reluctance effective to limit current through said thyristor in the initial phase of firing of said thyristor.
Claim 2
Dependent Claim
100 words
Ignition control device comprising transformer having a primary and secondary winding, spark electrodes connected across said secondary winding, a capacitor in series with said primary winding, means connecting a continuous voltage source across the series combination of said capacitor and transformer primary winding to charge said capacitor, and a thyristor connected in parallel with said series combination, control electrode means for firing said thyristor thereby causing discharge of said capacitor through said transformer primary winding, said transformer having a core of high initial reluctance effective to limit current through said thyristor in the initial phase of firing of said thyristor.
Claim 3
Dependent Claim
100 words
Ignition control device comprising transformer having a primary and secondary winding, spark electrodes connected across said secondary winding, a capacitor in series with said primary winding, means connecting a continuous voltage source across the series combination of said capacitor and transformer primary winding to charge said capacitor, and a thyristor connected in parallel with said series combination, control electrode means for firing said thyristor thereby causing discharge of said capacitor through said transformer primary winding, said transformer having a core of high initial reluctance effective to limit current through said thyristor in the initial phase of firing of said thyristor.
Claim 4
Dependent Claim
100 words
Ignition control device comprising transformer having a primary and secondary winding, spark electrodes connected across said secondary winding, a capacitor in series with said primary winding, means connecting a continuous voltage source across the series combination of said capacitor and transformer primary winding to charge said capacitor, and a thyristor connected in parallel with said series combination, control electrode means for firing said thyristor thereby causing discharge of said capacitor through said transformer primary winding, said transformer having a core of high initial reluctance effective to limit current through said thyristor in the initial phase of firing of said thyristor.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |