US3864622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized control circuit for magneto motor ignition systems
Assignee: Robert Bosch GmbH
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Filing: 1973-07-31
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Granted: 1975-02-04
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Expires: 1993-07-31
Abstract
Abstract During the negative half cycle of the magneto output voltage, a capacitor in series with a diode is charged to a voltage limited by a Zener diode of a negative limiting circuit. During the next positive half cycle the sum of the magneto voltage and the capacitor voltage are applied over a current limiting resistor to the base of a power transistor in the primary circuit, holding the latter turned on until a timing pulse applied to a control transistor short circuits the base-emitter path of the power transistor, switching off the latter and permitting the capacitor to discharge. The interruption of the primary current produces a spark in the secondary circuit, the armature of the magneto being wound to serve also as an ignition coil.
Inventors
- 👤 George Haubner
- 👤 Walter Hofer
- 👤 Peter Schmaldienst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:51
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/083; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
248 words
In an internal combustion engine ignition system having a magneto armature provided with at least one winding arranged to be excited by a magnetized rotor driven by the engine, and having voltage step-up means coupled with said magneto armature, which means is coupled with a low-voltage winding of said armature and connected by ignition cable to at least one spark plug, said ignition system having also a spark-timing pulse generator operated in synchronism with said engine, an ignition control circuit for connection to said low-voltage winding of said armature, comprising: a controllable semiconductor device (16) having a switching path and a control path and having its switching path in circuit with said low-voltage winding and its control path in a control circuit; means (21) to supply the spark-timing pulse output of said pulse generator (22) to the control circuit of said semiconductor device (16) in such polarity as to put the switching path of said semiconductor device quickly into its non-conducting condition and thereby interrupt the current in said low-voltage winding; a series combination of a capacitor (17) and a diode (18) connected so as to bridge at least a substantial part of said low-voltage winding (12b), said diode being poled for conduction in the direction opposite to the direction of conduction of said switching path of said semiconductor device (16), and a resistively conductive connection between said control electrode of said semiconductor device (16) and the common connection (19) of said capacitor (17) and said diode (18).
Claim 2
Dependent Claim
248 words
In an internal combustion engine ignition system having a magneto armature provided with at least one winding arranged to be excited by a magnetized rotor driven by the engine, and having voltage step-up means coupled with said magneto armature, which means is coupled with a low-voltage winding of said armature and connected by ignition cable to at least one spark plug, said ignition system having also a spark-timing pulse generator operated in synchronism with said engine, an ignition control circuit for connection to said low-voltage winding of said armature, comprising: a controllable semiconductor device (16) having a switching path and a control path and having its switching path in circuit with said low-voltage winding and its control path in a control circuit; means (21) to supply the spark-timing pulse output of said pulse generator (22) to the control circuit of said semiconductor device (16) in such polarity as to put the switching path of said semiconductor device quickly into its non-conducting condition and thereby interrupt the current in said low-voltage winding; a series combination of a capacitor (17) and a diode (18) connected so as to bridge at least a substantial part of said low-voltage winding (12b), said diode being poled for conduction in the direction opposite to the direction of conduction of said switching path of said semiconductor device (16), and a resistively conductive connection between said control electrode of said semiconductor device (16) and the common connection (19) of said capacitor (17) and said diode (18).
Claim 3
Dependent Claim
65 words
An ignition control circuit as defined in claim 1 in which said series combination of a capacitor and a diode bridges all of said low-voltage winding and in which the resistively conductive connection between said common connection (19) of said capacitor (17) and said diode (18) and said control electrode of said semiconductor device (16) includes a resistor (20) through which said connection is effected.
Claim 4
Dependent Claim
46 words
An ignition control circuit as defined in claim 2 in which a second controlled semiconductor device (21) is provided in the control circuit of said first semiconductor device (16), with its switching path connected in parallel to the control path of said first semiconductor device (16).
Claim 5
Dependent Claim
29 words
An ignition control circuit as defined in claim 3 in which said first controlled semiconductor device is a transistor, having a collector-emitter switching path and a base-emitter control path.
Claim 6
Dependent Claim
21 words
An ignition control circuit as defined in claim 4 in which said second controlled semiconductor device (21) is also a transistor.
Claim 7
Dependent Claim
24 words
An ignition control circuit as defined in claim 3 in which said pulse generator (22) is a magnetic pulse generator driven by said engine.
Claim 8
Dependent Claim
39 words
An ignition control circuit as defined in claim 6 in which a coupling resistor (24) is provided between an ungrounded terminal of said low-voltage winding (12b) of said armature and the control electrode of said second semiconductor device (21).
Claim 9
Dependent Claim
79 words
An ignition circuit as defined in claim 6 in which said low-voltage winding (12b) is bridged by unidirectional peak-reducing means providing a current path (25), including a diode (26) poled for conduction in the direction opposite to the direction of conduction of said switching path of said first semiconductor device (16). 9. An ignition circuit as defined in claim 8 in which said diode (26) of said peak-reducing means (25) is connected in series with a Zener diode (27).
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |