US3808513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system including dc-ac inverter
Assignee: Texaco Inc
•
Filing: 1972-04-21
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Granted: 1974-04-30
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Expires: 1992-04-21
Abstract
Abstract Electronic DC-to-AC inverter system that employs a transistor oscillator using various types of transistors. It includes means to limit reverse voltages at the base-emitter paths of the transistors. It may be included in a continuous-wave highfrequency ignition system for internal combustion engines.
Inventors
- 👤 R Canup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:22
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832; H02M7/53835; F; F02; F02P; F02P3/00; F02P3/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
In a single-transformer high-frequency continuous-wave ignition system for internal combustion engines, the combination comprising a transformer having a high-voltage secondary winding for delivering AC spark voltages directly to said internal combustion engine, a center-tapped primary winding on said transformer, a pair of transistors connected to said primary winding, said transistors each havine base, collector and emitter electrodes, at least one oscillator feedback winding on said transformer, circuit means for connecting said transistors into an oscillator having base-to-emitter voltage paths, said circuit means comprising a diode in shunt of said base-to-emitter voltage paths, for limiting the amplitude of the reverse-polarity voltages, and the combination further comprises a control winding on said transformer, and engine-controlled means for cutting off and applying a DC bias current in said control winding.
Claim 2
Dependent Claim
127 words
In a single-transformer high-frequency continuous-wave ignition system for internal combustion engines, the combination comprising a transformer having a high-voltage secondary winding for delivering AC spark voltages directly to said internal combustion engine, a center-tapped primary winding on said transformer, a pair of transistors connected to said primary winding, said transistors each havine base, collector and emitter electrodes, at least one oscillator feedback winding on said transformer, circuit means for connecting said transistors into an oscillator having base-to-emitter voltage paths, said circuit means comprising a diode in shunt of said base-to-emitter voltage paths, for limiting the amplitude of the reverse-polarity voltages, and the combination further comprises a control winding on said transformer, and engine-controlled means for cutting off and applying a DC bias current in said control winding.
Claim 3
Dependent Claim
53 words
The invention according to claim 1, wherein the combination further comprises a pair of oscillator feedback windings on said transformer, a resistor in series with each of said feedback windings, and a diode in shunt of each of said resistors for permitting full current flow in the forward direction over said base-to-emitter path.
Claim 4
Dependent Claim
12 words
The invention according to claim 1, wherein said transistors are diffused-base type.
Claim 5
Dependent Claim
12 words
The invention according to claim 2, wherein said transistors are diffused-base type.
Claim 6
Dependent Claim
12 words
The invention according to claim 1, wherein said transistors are silicon type.
Claim 7
Dependent Claim
12 words
The invention according to claim 2, wherein said transistors are silicon type.
Claim 8
Dependent Claim
169 words
In single-transformer high-frequency continuous-wave ignition system for internal combustion engines, the combination comprising a transformer having a high-voltage secondary winding for delivering spark voltages to said internal combustion engine, a center-tapped primary winding on said transformer, a pair of transistors, said transistors each having base, collector and emitter electrodes, an oscillator feedback winding on said transformer, first circuit means for connecting a DC voltage to said center tap of said primary winding, second circuit means for connecting said collector electrodes to the ends of said primary winding, third circuit means for connecting said emitter electrodes to ground, fourth circuit means, including a resistor therein, for connecting the ends of said feedback winding to said base electrodes, a pair of diodes, one connected between each said base electrode and ground with polarity for shunting reverse voltages at base-emitter paths in excess of the forward voltages of said diodes, an ignition-control winding on said transformer, and engine-controlled means for cutting off and applying a DC bias current in said control winding.
Claim 9
Dependent Claim
169 words
In single-transformer high-frequency continuous-wave ignition system for internal combustion engines, the combination comprising a transformer having a high-voltage secondary winding for delivering spark voltages to said internal combustion engine, a center-tapped primary winding on said transformer, a pair of transistors, said transistors each having base, collector and emitter electrodes, an oscillator feedback winding on said transformer, first circuit means for connecting a DC voltage to said center tap of said primary winding, second circuit means for connecting said collector electrodes to the ends of said primary winding, third circuit means for connecting said emitter electrodes to ground, fourth circuit means, including a resistor therein, for connecting the ends of said feedback winding to said base electrodes, a pair of diodes, one connected between each said base electrode and ground with polarity for shunting reverse voltages at base-emitter paths in excess of the forward voltages of said diodes, an ignition-control winding on said transformer, and engine-controlled means for cutting off and applying a DC bias current in said control winding.
Claim 10
Dependent Claim
12 words
The invention according to claim 7, wherein said transistors are diffused-base type.
Claim 11
Dependent Claim
12 words
The invention according to claim 7, wherein said transistors are silicon type.
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |