Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1975-07-25
1976-12-07
La Roche, Eugene
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315227R, 315247, 315276, 315DIG5, H05B 4123
Patent
active
039964957
ABSTRACT:
An improved ballast circuit for one or more electric discharge lamps includes a nonlinear variable capacitor connected in series with an iron core inductor and the lamps across the terminals of a source of alternating current. The nonlinear capacitor preferably exhibits a voltage and/or current dependent capacitance characteristic. The use of the nonlinear capacitor improves the crest factor of the lamp current waveform thereby increasing the operating efficiency of the ballast circuit and reducing the size and cost of the iron core inductor.
REFERENCES:
patent: 2593651 (1952-04-01), Bird
patent: 3309568 (1967-03-01), Nilssen
patent: 3911320 (1975-10-01), Crawford et al.
Franzblau Bernard
La Roche Eugene
North American Philips Corporation
Trifari Frank R.
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