Solid state ignition system

Details Solid state ignition system Solid state ignition system

1981-08-07

1983-11-29

Shaw, C. C.

Electricity: electrical systems and devices

Igniting systems

For electric spark ignition

315209T, 315219, F23Q 300

Patent

active

044183755

ABSTRACT:
The solid state ignition system accurately controls the maximum primary winding current over a large range of operating voltages and selectively reduces its power consumption in response to a preselected ignition condition. The system includes an ignition transformer having a primary winding connected in series with a current regulator and a secondary winding connected with an igniter device for igniting an air-fuel mixture. A Darlington transistor is connected in series with the primary winding for blocking and permitting the flow of electrical current through the primary winding. A current regulating oscillator which controls the Darlington transistor alternately causes the transistor to be biased conductive and nonconductive. A comparator which is connected with the current sensor for sensing the primary winding current compares the sensed primary current with a preselected current. In response to the sensed current meeting or exceeding the preselected current, the comparator causes the current regulating oscillator to cause the transistor to block current flow. A current reducing circuit is connected with the current regulating oscillator to cause the current regulating oscillator to hold the transistor nonconductive intermittently in response to a sensed combustion condition. In this manner, the primary winding current is limited to a preselected magnitude without regard to the magnitude of the voltage from the voltage regulator and the average primary winding current is reduced in response to the combustion condition.

REFERENCES:
patent: 3260299 (1966-07-01), Lister
patent: 3318358 (1967-05-01), Potts
patent: 3377998 (1968-04-01), Adams et al.
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patent: 3718423 (1973-02-01), Matthews
patent: 3877864 (1975-04-01), Carlson
patent: 4051827 (1977-10-01), Capurka et al.
patent: 4138977 (1979-02-01), Grather et al.
patent: 4167767 (1979-09-01), Courier de Mere
patent: 4327310 (1982-04-01), Jorg

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