Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Delayed application of the discharge potential
Patent
1995-08-23
1997-04-01
Pascal, Robert
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Delayed application of the discharge potential
315106, 315289, H05B 3700
Patent
active
056169906
ABSTRACT:
A ballast for powering a fluorescent lamp with filaments requiring preheating. Control circuitry within the ballast delays an ignitor from being turned on until the filaments have been sufficiently preheated. The control circuitry is isolated and thereby protected from the high voltage pulses of the ignitor by an optocoupler. A SIDAC employed in the generation of the high voltage pulses is not relied upon for sensing full arc discharge of the lamp. The breakover voltage of the SIDAC can therefore be set at a much lower than conventional level resulting in the generation of more high voltage pulses over a prefixed period of time.
REFERENCES:
patent: 3553526 (1971-01-01), Moerkens et al.
patent: 5424617 (1995-06-01), Garbowicz et al.
Garbowicz Glenn D.
Troy Patrick E.
Wetterich Janis L.
Blocker Edward
Franzblau Bernard
Pascal Robert
Philips Electronics North America Corporation
Shingleton Michael
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