US4233951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition circuit for internal combustion engines
Assignee: KYORITSU SEISAKUJO KK
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Filing: 1979-12-10
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Granted: 1980-11-18
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Expires: 1999-12-10
Abstract
Abstract An improved ignition circuit for internal combustion engines is described herein, in which a diode is connected in parallel to a primary winding of an ignition coil of a magneto, and a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, whereby overheating of said transistors caused by a primary reverse current of said magneto ignition coil flowing into the transistors can be prevented and also proper ignition timing can be maintained. In addition, in the improved ignition circuit a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, and the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit, whereby a primary forward current through said primary winding can be steeply cut off to provide a spark discharge at an especially high voltage.
Inventors
- 👤 Hisao Take
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:39
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/055; F02P3/0552
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
An ignition circuit for internal combustion engines characterized in that a diode is connected in parallel to a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, and the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor-equivalent circuit may be fed by the voltage drop across said temperature compensating resistor.
Claim 2
Dependent Claim
186 words
An ignition circuit for internal combustion engines characterized in that a diode is connected in parallel to a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, and the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor-equivalent circuit may be fed by the voltage drop across said temperature compensating resistor.
Claim 3
Dependent Claim
30 words
An ignition circuit for internal combustion engines as claimed in claim 1, in which said temperature compensating resistor is composed of a series connection of a resistor and a diode.
Claim 4
Dependent Claim
47 words
An ignition circuit for internal combustion engines as claimed in claim 1, in which said temperature compensating resistor is composed by connecting a resistor in series to a circuit formed by connecting another resistor in parallel to a series connection of yet another resistor and a thermistor.
Claim 5
Dependent Claim
47 words
An ignition circuit for internal combustion engines as claimed in claim 1, in which said temperature compensating resistor is composed by connecting a resistor in parallel to a circuit formed by connecting another resistor in series to a parallel connection of yet another resistor and a thermistor.
Claim 6
Dependent Claim
216 words
An ignition circuit for internal combustion engines characterized in that a series circuit of a diode and a constant voltage diode is connected across a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected via a diode to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor equivalent circuit may be fed by the voltage drop across said temperature compensating resistor, and a capacitor is connected between a base and an emitter of one of the transistors in said thyristor-equivalent circuit.
Claim 7
Dependent Claim
216 words
An ignition circuit for internal combustion engines characterized in that a series circuit of a diode and a constant voltage diode is connected across a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected via a diode to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor equivalent circuit may be fed by the voltage drop across said temperature compensating resistor, and a capacitor is connected between a base and an emitter of one of the transistors in said thyristor-equivalent circuit.
Claim 8
Dependent Claim
190 words
An ignition circuit for internal combustion engines characterized in that a diode is connected in parallel to a part of a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected directly to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, and the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor-equivalent circuit may be fed by the voltage drop across said temperature compensating resistor.
Claim 9
Dependent Claim
190 words
An ignition circuit for internal combustion engines characterized in that a diode is connected in parallel to a part of a primary winding of an ignition coil of a magneto, also a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, a series circuit of a temperature compensating resistor and a resistor is connected between the base of said composite transistor circuit and one terminal of said primary winding, an anode-cathode path of a thyristor-equivalent circuit in which a collector of a PNP transistor is connected directly to a base of an NPN transistor and the base of said PNP transistor is connected to the collector of said NPN transistor, is connected between the junction of said temperature compensating resistor and said resistor and the other terminal of said primary winding, and the gate of said thyristor-equivalent circuit is connected to the base of said composite transistor circuit so that the gate current of said thyristor-equivalent circuit may be fed by the voltage drop across said temperature compensating resistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |