Discharge lamp ballast with DC-DC converter

Details Discharge lamp ballast with DC-DC converter Discharge lamp ballast with DC-DC converter

2005-03-01

2005-03-01

Vo, Tuyet T. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S279000

Reexamination Certificate

active

06861812

ABSTRACT:
An improved ballast for a discharge lamp includes a DC—DC converter which receives an input DC voltage from a voltage source to provide a pre-starting voltage to make the lamp ready for being ignited or started. The DC—DC converter has a switching element which is driven to turn on and off for generating the pre-starting voltage. A start-accelerating means in included in the ballast in order to vary at least one of the switching frequency and the on-period of the switching element based upon the monitored input DC voltage in a direction of accelerating the increase of the output DC voltage to the pre-starting voltage until the output DC voltage reaches the pre-starting voltage.

REFERENCES:
patent: 5572094 (1996-11-01), Yamashita et al.
patent: 6034487 (2000-03-01), Yamashita et al.
patent: 6281642 (2001-08-01), Konishi et al.
patent: 6300726 (2001-10-01), Daub
patent: 198 43 643 (1999-05-01), None
patent: 1 021 072 (2000-07-01), None
patent: P2000-215996 (2000-08-01), None

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