US3857376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated ignition amplifier circuit
Assignee: Navistar International Corp
•
Filing: 1973-02-09
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Granted: 1974-12-31
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Expires: 1993-02-09
Abstract
Abstract Regulated ignition amplifier circuit wherein a transistor switch is controlled to build up a regulated constant current through an ignition coil primary winding and then opened to cause an increase in the voltage of both the primary and the secondary windings. A capacitor is charged during closure of the transistor switch from the rectified voltage developed by an oscillator, the oscillator being controlled through regulating circuitry from the voltage across the capacitor to charge the capacitor to a substantially constant voltage. In response to the increase in voltage of the primary winding, the capacitor is discharged through the primary winding by means of a silicon controlled rectifier and a disabling circuit responds to discharge current to disable the oscillator through the regulating circuitry to permit the rectifier to revert to a non-conductive state.
Inventors
- 👤 E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
In a circuit for energizing an ignition coil including inductively coupled primary and secondary winding means, capacitor means, and control means coupled in circuit with said capacitor means and said primary winding means, said control means comprising charging means for applying a voltage to said capacitor means for charging said capacitor means, discharge means for discharging said capacitor means through said primary winding means to generate a high voltage wave form in said secondary winding means for ignition, disabling means for disabling said charging means during discharge of said capacitor means through said primary winding means, said disabling means including means responsive to discharge current of said capacitor means to develop a control signal, and control means responsive to said control signal to disable said charging means, said disabling means including a control transformer having primary and secondary windings, said primary winding of said control transformer being coupled in series between said capacitor means and said primary winding means to develop said control signal in said secondary winding thereof in response to discharge current of said capacitor means through said primary winding thereof.
Claim 2
Dependent Claim
183 words
In a circuit for energizing an ignition coil including inductively coupled primary and secondary winding means, capacitor means, and control means coupled in circuit with said capacitor means and said primary winding means, said control means comprising charging means for applying a voltage to said capacitor means for charging said capacitor means, discharge means for discharging said capacitor means through said primary winding means to generate a high voltage wave form in said secondary winding means for ignition, disabling means for disabling said charging means during discharge of said capacitor means through said primary winding means, said disabling means including means responsive to discharge current of said capacitor means to develop a control signal, and control means responsive to said control signal to disable said charging means, said disabling means including a control transformer having primary and secondary windings, said primary winding of said control transformer being coupled in series between said capacitor means and said primary winding means to develop said control signal in said secondary winding thereof in response to discharge current of said capacitor means through said primary winding thereof.
Claim 3
Dependent Claim
69 words
In a circuit as defined in claim 1, said discharge means including silicon controlled rectifier means rendered conductive for discharging said capacitor means through said primary winding means, said disabling means being effective to prevent said charging means from maintaining current through said silicoN controlled rectifier means and to allow said silicon controlled rectifier means to revert to a non-conductive state after substantially complete discharge of said capacitor means.
Claim 4
Dependent Claim
31 words
In a circuit as defined in claim 1, said control means being operative to disable said charging means for a predetermined time interval after termination of flow of said discharge current.
Claim 5
Dependent Claim
64 words
In a circuit as defined in claim 1, regulator means responsive to the voltage applied from said charging means to said capacitor means and arranged for controlling said charging means to charge said capacitor means to a substantially constant regulated voltage prior to discharge by said discharge means, said disabling means being operative through said regulator means in controlling disabling of said charging means.
Claim 6
Dependent Claim
73 words
In a circuit as defined in claim 4, said charging means comprising oscillator means for connection to a DC source to develop a high AC voltage and rectifier means for rectifying said high AC voltage to develop a high rectified voltage for charging said capacitor means, said regulator means comprising transistor means controlling operation of said oscillator means, and means controlling said transistor means in response to the voltage across said capacitor means.
Claim 7
Dependent Claim
47 words
In a circuit as defined in claim 1, current control means for building up current through said primary winding means and then cutting off said current to develop a short duration high voltage pulse in said secondary winding means immediately prior to operation of said discharge means.
Claim 8
Dependent Claim
54 words
In a circuit as defined in claim 6, said current control means including transistor means in series with said primary winding means, and means for regulating current through said transistor means to cause a build-up of current through said primary winding means to a substantially constant value prior to cutting off of said current.
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |