Internal-combustion engines – Igniters – Sparkers
Patent
1980-05-23
1983-08-02
Myhre, Charles J.
Internal-combustion engines
Igniters
Sparkers
123651, 123655, 315209T, 315218, F02P 108
Patent
active
043959814
ABSTRACT:
To suppress negative half-waves derived from a magneto armature and not used for ignition without use of external damping networks, the semiconductor switch controlling current flow, and abrupt turn-off to initiate an ignition event, is formed as a monolithic semiconductor element, and the inherent inverse diode of the monolithic element is utilized to pass the reverse voltage half-waves. To prevent damage to the inherent diodes due to over-voltage or current overloading, a damping resistance element is connected in series with the main current carrying path of the monolithic circuit elements, preferably a Darlington transistor, which, preferably, is a semiconductor resistor having a preferred current passage characteristic in the same direction as the current flow through the Darlington transistor, for example a Zener diode, a resistor, or a series of diodes polarized like the inverse diode, bridged by a diode conducting in the same direction as the Darlington transistor, or the like.
REFERENCES:
patent: 3374778 (1968-03-01), Dixon
patent: 3864622 (1975-02-01), Haubner et al.
patent: 3878824 (1975-04-01), Haubner et al.
patent: 3894525 (1975-07-01), Haubner et al.
patent: 3938491 (1976-02-01), Mazza
patent: 4188930 (1980-02-01), Santi
Orova Josef
Podrapsky Jiri
Dolinar Andrew M.
Myhre Charles J.
Robert & Bosch GmbH
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