Ignition system of multispark type

An ignition system of multispark type comprising:

• a first series closed circuit including a DC power supply, an energy storage coil and a first switching device;
• a second closed circuit including the energy storage coil, a reverse flow blocking means, the primary winding of the ignition coil and a second switching device;
• a capacitor connected to the energy storage coil through the reverse flow blocking means;
• first control signal generating means for generating a first control signal for cutting off the first switching device at an ignition timing after being turned on a predetermined time before the ignition timing to store energy in the energy storage coil;
• means for generating a multispark control signal for turning on and off the first and second switching devices alternately during a predetermined spark period after turning on the second switching device from the ignition timing;
• means for generating a second control signal for charging the capacitor with the energy stored in the energy storage coil by turning off the first switching device after being turned on to store energy in the energy storage coil while the second switching device is turned off,
• said second control signal generation means operating in synchronism with the end of generation of a multispark control signal from said multispark control signal generation means,
• conduction time setting means for setting the first turn-on time of the second switching device started by the multispark control signal generation means at an ignition timing, separately from the turn-on time during the subsequent multispark period, and
• current-responsive conduction time-determining means whereby the turn-on time of the first switching device started by said multispark control signal generation means is determined in accordance with the current flowing in the first switching device.