Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2007-05-25

2008-10-21

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural regulators

C315S308000, C315SDIG002

Reexamination Certificate

active

07439687

ABSTRACT:
A discharge lamp lighting circuit1includes an electric power supply part and a control part. The control part generates a control signal (Sc) for controlling the magnitude of electric power based on a lamp voltage (VL) of a discharge lamp. The electric power supply part supplies the electric power based on the control signal (Sc) from the control part to the discharge lamp. The control part has a differential computation part for differentiating a lamp voltage corresponding signal (VS) with respect to time and generating a first differential signal Sd1(=dVS/dt), and an integral computation part for integrating a second differential signal (Sd2) which monotonously increases and decreases as the first differential signal (Sd1) increases and decreases with respect to time and generating a first integral signal (Si1), and generates the control signal (Sc) so that the electric power decreases with an increase in the first integral signal (Si1).

REFERENCES:
patent: 6850015 (2005-02-01), Ishizuka et al.
patent: 6960886 (2005-11-01), Ishizuka
patent: 2006/0197467 (2006-09-01), Ohta et al.
patent: 2003-338390 (2003-11-01), None

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