Internal-combustion engines – Igniters – Incandescent
Patent
1975-11-07
1979-01-30
Myhre, Charles J.
Internal-combustion engines
Igniters
Incandescent
123148CB, 315209CD, F02P 308
Patent
active
041366590
ABSTRACT:
A capacitor discharge ignition system including a DC to AC inverter circuit for converting a battery voltage to high voltage AC, and a rectifier for rectifying the high voltage to DC. A power capacitor and the primary winding of the ignition coil are serially coupled across the output of the rectifier. A silicon controlled rectifier is also coupled across the output of the rectifier and has its trigger element coupled to a trigger circuit which provides a trigger signal to turn on the silicon controlled rectifier in response to opening of breaker points thus causing the power capacitor to discharge through the primary winding of the ignition coil thereby to provide the requisite high voltage in the secondary winding to provide the spark at the respective spark plug. A ring capacitor is coupled across the primary winding of the ignition coil and is proportioned to provide a damped oscillatory current in the primary winding when the silicon controlled rectifier is turned off thereby limiting the rate of flux decay by clamping or ringing-out the remaining flux thus effectively clamping the secondary winding to a limited peak output voltage so as to inhibit misfiring.
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Dolinar Andrew M.
Myhre Charles J.
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