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A magneto ignition system includes a rotating magnet driven past a primary winding for firing the engine. The magneto generates a speed dependent signal having a following current pulse and a leading current pulse of a smaller amplitude than the following pulse. A Darlington power transistor has a c

A magneto ignition system includes a rotating magnet driven past a primary winding for firing the engine. The magneto generates a speed dependent signal having a following current pulse and a leading current pulse of a smaller amplitude than the following pulse. A Darlington power transistor has a collector connected in series with a voltage dropping resistor or diode to the winding. A resistor bias circuit connects the primary winding to the input of the power transistor. A cut-off transistor is connected to by-pass the bias circuit of the Darlington power transistor and thereby generate a pulse in the primary winding. A timing capacitor is connected to the primary winding in series with a diode and charging resistor. A control transistor has its input circuit connected between the timing capacitor and the resistors of the bias circuit. The control transistor responds to the differential of the bias circuit voltage and the capacitor voltage, whereby the control transistor drives the cut-off transistor to turn off the power transistor during the decreasing side of the winding circuit after it peaks at starting and low speeds and progressively increases with a gradual advance during the starting speed range, and includes a maximum advance established prior to the peak current value.

대표청구항 ▼

A breakerless ignition system for an internal combustion engine, comprising a generator having a rotating magnet means periodically coupled to a primary winding and generating an alternating current output including a leading pulse signal and a following pulse signal of opposite polarity interconnec

A breakerless ignition system for an internal combustion engine, comprising a generator having a rotating magnet means periodically coupled to a primary winding and generating an alternating current output including a leading pulse signal and a following pulse signal of opposite polarity interconnected to form a periodic output signal and operable to generate a firing voltage pulse upon interruption of said output signal, a switching power transistor means having a collector and an emitter and an input base, a control switch means connected to said input base to turn said power transistor means off, a voltage dropping means connected in series with said collector to enhance system operation at low engine speeds, and a full wave bridge rectifier with diode elements connected between said primary winding and said collector-to-emitter of said power transistor means, said voltage dropping means being one of said diode elements connected in series with the said collector and introducing said voltage drop into said circuit.