Ballast for a discharge lamp

Details Ballast for a discharge lamp Ballast for a discharge lamp

1999-03-30

2000-04-25

Philogene, Haissa

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315224, 315209R, 315DIG7, H05B 3700

Patent

active

060548150

ABSTRACT:
A ballast for a discharge lamp comprises a smoothing capacitor, an inverter circuit including at least one switching device connected in parallel to the smoothing capacitor, a driving circuit for driving the inverter circuit, an activating circuit for activating the driving circuit, a resonance circuit including first and second capacitors and an inductor connected to output terminals of the inverter circuit, a discharge lamp connected to output terminals of the resonance circuit, a third capacitor connected in parallel to the discharge lamp. A fourth capacitor and first and second rectifying elements connected in series are connected in parallel to the smoothing capacitor. Between both terminals of the fourth capacitor and terminals for connection to an AC power source, a filter and a rectifier are inserted. A terminal of the first capacitor other than that connected to the inverter circuit is connected to a junction of the first and second rectifying elements.

REFERENCES:
patent: 5404082 (1995-04-01), Hernandez et al.
patent: 5448137 (1995-09-01), Bobel
patent: 5469028 (1995-11-01), Nilssen
patent: 5914572 (1999-06-01), Qian et al.
patent: 5920155 (1999-07-01), Kanda et al.
patent: 5925984 (1999-07-01), Fischer et al.

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