US3599618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor ignition system with ballast compensation
Assignee: Motorola Solutions Inc
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Filing: 1970-05-28
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Granted: 1971-08-17
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Expires: 1990-05-28
Abstract
Abstract An ignition system has a transistor connected in series with a primary winding of a conventional spark coil, and a sensing resistor is also connected in series with the transistor. A silicon-controlled rectifier has the anode thereof connected to the base electrode of the transistor and the cathode thereof coupled to the emitter of the transistor effectively to be in parallel with the base-emitter junction. The gate electrode of the silicon-controlled rectifier is coupled to the sensing resistor to be rendered conductive in response to a predetermined voltage level developed at the sensing resistor. The siliconcontrolled rectifier, when conductive, decreases the current flow through the transistor and the primary winding of the spark coil and, when nonconductive, increases the current flow through the transistor and the primary winding of the spark coil.
Inventors
- 👤 Gunther Schuette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:09
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/05; F02P3/051
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
The transistor ignition system of claim 1 wherein said first current control device is a transistor having the emitter-collector junction thereof connected in series with said primary winding, said control electrode being the base electrode of said transistor, and said second current control device is a silicon-controllEd rectifier having the anode-cathode junction thereof connected in parallel with the base-emitter junction of said transistor with the gate electrode of said silicon-controlled rectifier coupled to said transistor to sense current flow therethrough.
Claim 2
Dependent Claim
57 words
The transistor ignition system of claim 1 further including a sensing resistor connected in series with said first current control device, and said control electrode of said second current control device is coupled to said sensing resistor to render said second current control device conductive in response to a predetermined voltage value developed across said sensing resistor.
Claim 3
Dependent Claim
46 words
The transistor ignition system of claim 3 wherein the resistance value of said sensing resistor and the reactance value of said primary winding cause a decreasing voltage across said sensing resistor with increased r.p.m. of said fuel combustion engine to disable said second current control device.
Claim 4
Dependent Claim
26 words
The transistor ignition system of claim 1 further including a ballast resistance means connected in series with said primary winding and said first current control device.
Claim 5
Dependent Claim
69 words
The transistor ignition system of claim 1 further including a third current control device having load electrodes connected in series between a power source and the junction of the control electrode of said first current control device and a given load electrode of said second current control device, said third current control device having a control electrode coupled to said switch means to be rendered conductive in response thereto.
Claim 6
Dependent Claim
163 words
A transistor ignition system for operating from a voltage source including in combination: an ignition coil having a primary winding with one end thereof connected to the voltage source and a secondary winding arranged to supply spark discharges; a transistor having the emitter-collector junction thereof connected in series with said primary winding and further having a base electrode; a sensing resistor connected in series with the emitter-collector junction of said transistor to develop a voltage thereacross indicative of the conductive state of said transistor; switch means to develop external pulse signal information, said switch means coupled to said base electrode of said transistor periodically to render said transistor conductive thus energizing said primary winding; and a silicon-controlled rectifier having the anode-cathode junction thereof connected in parallel with the base-emitter junction of said transistor and the gate electrode of said silicon-controlled rectifier coupled to said sensing resistor to render said silicon-controlled rectifier conductive in response to a predetermined voltage value at said sensing resistor.
Claim 7
Dependent Claim
23 words
The transistor ignition system of claim 7 further including a ballast resistance means connected in series with said primary winding and said transistor.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |