| 摘要 |
PURPOSE:To keep an ignition time period at a constant every time, by means of constituting so as to be operated in a trigger action by the potential difference of the voltage value when the induced voltage value of the primary coil wire of an ignition coil passes through the max. value and the voltage which lowers in turn. CONSTITUTION:Against the base voltage of a transistor circuit TrC is began to be lowered when the induced voltage value of the primary coil wire of an ignition coil passes through the max. value, the potential of the positive side electrode of a condenser C, namely, the potential of a point B is remained as it is, thereby the potential of the voltage dividing point of the voltage dividing circuit connected to a point A via a diode circuit DC, is to be lowered in its potential against to the point B. And, when the potenial of the point A is lowered than that of the point B, a planar type N gate thyristor PUT is triggered. By such means, because that the charge of the condenser C is discharged, the thyristor SCR is triggered, and turns off the transistor circuit TrC. |
