US3961617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition device for an internal combustion engine
Assignee: SUWA ELECTRIC WIRE CO Ltd
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Filing: 1974-11-27
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Granted: 1976-06-08
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Expires: 1994-11-27
Abstract
Abstract An ignition device for an internal combustion engine which comprises a DC-DC converter for stepping up battery voltage; a capacitor charged with output from said DC-DC converter; an SCR for discharging the electric energy stored in the capacitor through the primary side of an ignition coil; a circuit for igniting the SCR according to the operating condition of a contact breaker; a bias voltage source for rectifying output voltage from bias voltage generating winding fitted to the oscillation voltage stepup transformer of the DC-DC converter and impressing the resultant negative output on the SCR gate and the resultant positive output of the SCR cathode; a transformer type coupling circuit connected between a circuit included in the DC-DC converter to generate high rectified output voltage and the capacitor, thereby coupling the DC-DC converter with the capacitor, wherein the transformer type coupling circuit prevents excess load from being applied on the DC-DC converter when the SCR is rendered conducting and the voltage generated on the secondary side of said transformer is added to output voltage from the DC-DC converter to provide an increased level of voltage.
Inventors
- 👤 Yasuro Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:41
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
An ignition device for an internal combustion engine which comprises a DC-DC converter operatively connected to receive the output voltage of a battery and including an oscillation voltage stepup transformer for increasing the battery voltage; a discharge capacitor charged with output from said DC-DC converter; a transformer type circuit for coupling said DC-DC converter with said discharge capacitor including a transformer provided with a primary winding, a first terminal of which is connected to the positive output terminal of said DC-DC converter and a secondary winding, a first terminal of which is connected to a second terminal of said primary winding, a first diode connected between said second terminal of said primary winding and said discharge capacitor, and a second diode connected between a second terminal of said secondary winding and said discharge capacitor; an SCR for discharging electric energy stored in said discharge capacitor through the primary winding of an ignition coil; an ignition circuit for triggering said SCR responsive to the operation of a contact breaker; and biasing means for impressing reversed bias voltage across the gate and cathode of said SCR.
Claim 2
Dependent Claim
184 words
An ignition device for an internal combustion engine which comprises a DC-DC converter operatively connected to receive the output voltage of a battery and including an oscillation voltage stepup transformer for increasing the battery voltage; a discharge capacitor charged with output from said DC-DC converter; a transformer type circuit for coupling said DC-DC converter with said discharge capacitor including a transformer provided with a primary winding, a first terminal of which is connected to the positive output terminal of said DC-DC converter and a secondary winding, a first terminal of which is connected to a second terminal of said primary winding, a first diode connected between said second terminal of said primary winding and said discharge capacitor, and a second diode connected between a second terminal of said secondary winding and said discharge capacitor; an SCR for discharging electric energy stored in said discharge capacitor through the primary winding of an ignition coil; an ignition circuit for triggering said SCR responsive to the operation of a contact breaker; and biasing means for impressing reversed bias voltage across the gate and cathode of said SCR.
Claim 3
Dependent Claim
113 words
An ignition device according to claim 1, wherein said DC-DC converter comprises an oscillation voltage stepup transformer provided with a primary winding, a feedback winding and a secondary winding; first and second transistors connected in series to both ends of said primary winding of said oscillation voltage stepup transformer in opposite polarities, the bases of said first and secnd transistors being connected to the corresponding ends of said feedback winding; at least one resistor connected between the common junction of said first and second transistors and the positive output terminal of the battery; and a diode bridge rectification circuit connected between both terminals of said secondary winding of said oscillation voltage stepup transformer.
Claim 4
Dependent Claim
66 words
An ignition device according to claim 1, wherein said ignition circuit comprises a differentiation circuit for differentiating a rectangular wave signal resulting from the intermittent operation of the contact breaker; a diode clipping circuit for passing only positive pulses of the differentiated output signal from said differentiation circuit; and means for supplying the gate of said SCR with positive output pulses from the diode clipping circuit.
Claim 5
Dependent Claim
72 words
An ignition device according to claim 1, wherein the reversed a bias voltage-impressing means comprises bias winding provided on the secondary side of the oscillation voltage stepup transformer; a rectification circuit for rectifying voltage induced across both terminals of the bias winding; and connecting means for impressing positive output from said rectification circuit on the cathode of said SCR and negative output from said rectification circuit on the gate of said SCR.
Claim 6
Dependent Claim
69 words
An ignition device according to claim 1, wherein said transformer type coupling circuit comprises first and second diodes, the cathodes of which are connected to the negative output terminal of said DC-DC converter; and a transformer provided with a primary winding connected between the anode of said first diode and the cathode of said SCR and a secondary winding connected between the anodes of said first and second diodes.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |