Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2007-08-17

2010-02-02

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S274000, C315S247000, C315S224000

Reexamination Certificate

active

07656102

ABSTRACT:
A discharge lamp lighting circuit includes a power supplying portion having a series resonant circuit containing transistors and a bridge driver, and a control portion for generating a control signal Sc1to control a driving frequency of the bridge driver. The control portion has a sample hold portion for generating a constant control signal S1, a frequency follow-up control portion for generating a control signal S2in such a manner that a phase difference between a voltage and a current in the series resonant circuit is approximately zero, and a power control portion for generating a control signal S3in such a manner that a magnitude of an AC power approximates a steady value. The control signal S1is selected from a time t3to a time t4, the control signal S2is selected from the time t4to a time t5, and the control signal S3sent from the power control portion13is selected as the control signal Sc1after the time t5.

REFERENCES:
patent: 7291990 (2007-11-01), Ichikawa et al.
patent: 2005-63821 (2005-03-01), None

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