Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1993-10-26
1995-04-11
Pascal, Robert J.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315278, 315282, 315247, 315244, 315DIG5, H05B 4116
Patent
active
054061750
ABSTRACT:
A lead ballast circuit with power regulation for a gas discharge lamp includes an input pair of conductors for receiving an a.c. supply voltage, the magnitude of which voltage fluctuates within a known range. Further included is an output pair of conductors for supplying a driving voltage to the lamp. A lead inductor having a magnetic core and a lead capacitance serially connected to the lead inductor between an input, and an output, conductor are included. The inductive impedance of the lead inductor is less than the capacitive impedance of the lead capacitance whereby the aggregate impedance of the serially connected inductor and capacitance is capacitive rather than inductive. The lead ballast circuit also includes a power factor-correcting inductor connected across the input conductor pair, and having a magnetic core that shares a leg in common with the magnetic core of the lead inductor. The magnetic cores of the lead and power factor-correcting inductors are constructed so that magnetic flux in the common leg increases in saturation as the a.c. supply voltage increases within the mentioned fluctuation range, hence reducing the inductive impedance of the lead inductor and consequently increasing the mentioned aggregate impedance, whereby, as the a.c. supply voltage increases in the fluctuation range, an increasing amount of such voltage appears across the increasing aggregate impedance so as to maintain the voltage and hence power of the lamp within a regulated range.
REFERENCES:
patent: 3678371 (1972-07-01), Nuckolls
patent: 3684921 (1972-08-01), De Leon
patent: 3772565 (1973-11-01), Lenz et al.
patent: 4891562 (1990-01-01), Nuckolls et al.
patent: 5049789 (1991-09-01), Kumar et al.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Philogene Haissa
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