Discharge lamp ballast circuit

Details Discharge lamp ballast circuit Discharge lamp ballast circuit

1981-03-30

1983-09-27

La Roche, Eugene

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315290, 315289, 315244, 315245, 315127, 361 91, H02H 320, H05B 3702, H05B 4114

Patent

active

044069766

ABSTRACT:
A discharge lamp ballast circuit comprises at least one discharge lamp connected in series circuit with a ballast capacitor and inductor across a pair of input terminals for a source of A.C. supply voltage. A controlled semiconductor switching element is coupled across the lamp electrodes and a control circuit for the switching element is coupled to the input terminals and to a control electrode of the switching element. A voltage dependent non-linear impedance device is connected in shunt with the capacitor so as to limit the capacitor voltage to a predetermined value. The voltage dependent impedance device prevents the occurrence of hazardous voltage levels in the circuit and improves the stability during the warm up phase.

REFERENCES:
patent: 2409150 (1946-10-01), Rice
patent: 4253043 (1981-02-01), Chermin et al.

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