Ignition system for a spark ignited internal combustion engine

摘要

An ignition system for a spark-ignited internal combustion engine has a transistor connected in series with the primary winding of an ignition coil. The transistor is switched ON and OFF in synchronism with rotation of the crankshaft of the engine. Primary winding current is sensed by a resistor and the voltage developed across the resistor is fed back into an error amplifier which causes the transistor to be biased into a current-limiting mode when primary winding current increases to a predetermined level. The feedback loop has a capacitor which is a feedback compensation element. This capacitor, together with a resistor form an RC timing circuit which is operative at times to prevent the transistor from being biased back ON for a predetermined time period after it has been biased OFF.