ZUENDEINRICHTUNG FUER BRENNKRAFTMASCHINEN

摘要

In a magneto ignition system where the magneto generator has two windings with a different number of turns, a diode is connected between the winding with the larger number of turns and the capacitor, the discharge of which through the spark coil generates the ignition voltage. The two windings are excited in phase. A second diode is connected between the two windings in such a way that when there is a positive voltage half-wave of the polarity which causes the first diode to conduct, the second diode is blocked so long as the winding with the larger number of turns has a voltage exceeding that across the winding with the smaller number of turns. At higher speeds the second diode conducts, thus preventing the capacitor voltage at ignition time from dropping with increasing speed. During voltage half-waves of the opposite polarity, when both windings are unloaded, the second diode conducts at whatever the speed the engine is running, reducing the peak voltage by the equalizing current that flows and thus protects the first diode against the possibility of excessive back voltage.