Feedback sampling control circuit for lamp driving system

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit

Reexamination Certificate

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Details

C291S027000, C291S027000, C291S027000

Reexamination Certificate

active

07067991

ABSTRACT:
The invention discloses a feedback sampling control circuit for a lamp driving system having a feedback loop, in that the feedback sampling control circuit includes a switch and an effective current sampling controller. The switch is electrically coupled in the feedback path of the lamp driving system. The effective current sampling controller controls switching of the switch based on a voltage or current signal from a high voltage terminal of the lamp, such that an effective current actually sampled by a feedback controller in the lamp driving system is controlled so that a current component of a parasitic capacitance contained in the effective current is minimized. Thereby, the disadvantage caused by the leakage current through the parasitic capacitance can be eliminated and it is thus possible to precisely control the lamp current and to obtain a stable brightness quality.

REFERENCES:
patent: 6108215 (2000-08-01), Kates et al.
patent: 6337544 (2002-01-01), Wang et al.
patent: 6864644 (2005-03-01), Kernahan

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