Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1983-07-18
1985-11-12
Dixon, Harold
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315103, 315239, 315276, H05B 3702
Patent
active
045530718
ABSTRACT:
A ballast for a fluorescent lamp including a tuned circuit in series with a pair of voltage input terminals to which an input AC voltage is applied. The tuned circuit includes a capacitor in series with an inductor, with the resonant frequency of the tuned circuit being approximately 1/2 the frequency of the input voltage. At start-up, the inductor is very highly reactive to provide a starting voltage which is applied to a fluorescent lamp coupled across the inductor. A positive temperature coefficient resistor is in series with the inductor to limit the current flow therethrough. The inductor forms a part of the primary winding of a transformer having a secondary winding providing the heater voltage for the lamp. A second primary winding of the transformer provides a power factor correction for the tuned circuit.
REFERENCES:
patent: 2256224 (1941-09-01), Thayer
patent: 2417742 (1947-03-01), Dosio
patent: 2695375 (1954-11-01), Mendenhall
patent: 3710177 (1973-01-01), Ward
patent: 4017761 (1977-04-01), Woldring
patent: 4399391 (1983-08-01), Hammer et al.
Dixon Harold
Energies Technologies Corp.
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