Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Patent
1986-04-28
1987-05-05
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
123634, 315209CD, F02P 308
Patent
active
046623434
ABSTRACT:
A control circuit operates with a small toroidal transformer, having a ferrite core, to produce high voltage pulses efficiently. The circuit applies a magnetizing force to the transformer core that is in excess of the force required to produce maximum magnetization of the core. The initial magnetizing force is opposed by current flow in the secondary winding. As the secondary current flow approaches zero, it no longer can act to demagnetize the core and the primary can generate a rapid change in magnetic strength resulting in a high voltage in the secondary winding. The rate of change of current in the primary circuit is limited by a small inductor in series with the primary winding of the transformer. The charging circuit is interrupted simultaneously with discharge of a capacitor through the transformer primary. The core is insulated for high voltage and carries a secondary winding of about 300 turns extending over about 300 degrees of the circumference and a primary winding of about three to five turns. The unit occupies only about one cubic inch of space and weighs less than two ounces. It is capable of delivering more than 10,000 volts to a discharge element in a gaseous medium that results, subsequent to breakdown, with a current of as much as one-half ampere for a period of about 0.05 microseconds.
REFERENCES:
patent: 2896123 (1959-07-01), McNulty
patent: 3334619 (1967-08-01), Penn
patent: 3665908 (1972-05-01), Oishi
patent: 4245609 (1981-01-01), Gerry
Argenbright Tony M.
Barrett E. Thorpe
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