Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1979-06-07
1981-09-29
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315172, 315176, 315209T, 123620, 123622, 123653, H05B 3702, H05B 3904, H05B 4136
Patent
active
042925690
ABSTRACT:
An ignition system uses a transformer with a primary winding and a secondary winding wherein the secondary winding is intermittently coupled to at least one igniter load. An electronic switch is connected to the primary winding. Such electronic switch has an input circuit and an output circuit for enabling electrical energy to be stored in the primary winding. The electronic switch may have an additional switching stage feeding its input circuit for establishing the charging period of the primary winding consistent with the logic of a conventional ignition system. A timer is electrically coupled to the additional switching stage for intermittently activating such electronic switch. An alternating current modulator is connected to the primary winding so as to provide a modulating signal during the discharge period of the system thereby modulating the discharge current of the primary winding. Protective devices may be connected between the input and output circuits of the electronic switch so as to protect such switch against high transient surges. A capacitor may be connected to the secondary winding of the ignition transformer.
REFERENCES:
patent: 3906919 (1975-09-01), Asik et al.
patent: 3972315 (1976-08-01), Munden et al.
patent: 4033316 (1977-07-01), Birchenough
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