Electronic switching for solid state ignition

摘要

Breakerless ignition system of the inductive type is used to provide ignition pulses for an internal combustion engine which substantially duplicates the timing performance of a breaker-point magneto. The system utilizes a transistor for making and breaking the current flow in the primary coil of the ignition transformer. Switching of the transistor is controlled by a silicon controlled rectifier (SCR) and gating of the SCR is controlled by a time-delay network which includes a capacitor, resistor and a transistor switching means in circuit with the control electrode of the SCR. A second transistor and capacitor network controls the rate of rise of current to the time-delay network as a function of engine speed.