| 摘要 |
PURPOSE:To reduce the number of parts by a method wherein the ignition device for the internal-combustion engine is provided with a common feedback circuit between the connection point of an electric current detecting circuit and the constant current circuit of a power transistor and a collector connected commonly with respective driving transistors. CONSTITUTION:The ignition device of internal-combustion engine is provided with ignition signal generating circuits 10a-10d, the driving transistors 22a-22d, whose bases are connected to the ignition signal generating circuits 10a-10d and which are intermittent sequentially with mutually different timings, a common resistor 11 connected between the collector of the driving transistors 22a-22d and the positive pole of an electric source VB, power transistors 13a-13d controlled sequentially and intermittently by respective driving transistors 22a-22d and ignition coils 14a-14d. Further, the ignition device is equipped with common electric current detecting circuit 40 as well as constant electric current circuit 50 and the common feedback circuit 17 connected between the connecting point of the constant current circuit 50 and the electric current detecting circuit 40 and the driving transistors 22a-22d. |
