Electronic ignition system with low temp. compensation - has thermistor in oscillator feedback circuit to vary charging current

摘要

The electronic ignition system for i.c. engines is designed to operate efficiently at low ambient temperatures and low battery voltage by means of temp. dependent resistor in a feed back loop to vary the saturation of a transistor oscillator. The temp. sensitive resistor is in series with the feedback resistor and transformer winding connected between base and emitter of a transistor oscillator. The thermistor varies the saturation of the oscillator in inverse proportion to the ambient temp. A third winding (secondary) of the oscillator transformer supplies the storage capacitor which discharges into the primary winding of the ignition coil when the thyristor is triggered.