Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1978-11-24
1980-03-04
Smith, Alfred E.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315156, 361256, 361156, 315209T, 123148E, F02P 900
Patent
active
041919114
ABSTRACT:
An alternating current power source which is generally used to feed an ignition transformer primary winding may be electronically controlled so as to rapidly activate and deactivate the power source for each ignition cycle. An electronic switch intermittently interrupts current flowing in the primary winding and in the output circuit of the power source. Such electronic switch is made operable by virtue of the peak excursions of the alternating current, thus supplying the necessary collector potential to such switch during each firing cycle of the system. Such control system can have these type of controls in the collector circuit of the power source, the emitter circuit of such power source, the DC power input circuit for such power source, or in the output circuit of the power source's output transformer. A capacitor in series with the output circuit of the power source and with the primary winding enables current to be transferred out of the power source to such primary winding. Such electronic switch will provide discrete separation between successive output waveforms of successive ignition firing cycles. The system has appropriate logic circuits which initiate current conduction through the electronic switch and in the oscillator stages of the power source for each firing cycle, turning off the switch and oscillator stages between firing periods. Various types of trigger timing circuits are usable to trigger the several logic circuits for initiating igniter firing by means of the resultant high voltage and high current in the secondary winding of the ignition transformer.
REFERENCES:
patent: 4122815 (1978-10-01), Gerry
patent: 4140946 (1979-02-01), Gerry
patent: 4144476 (1979-03-01), Gerry
Roberts Charles F.
Smith Alfred E.
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