Closed-loop/dimming ballast controller integrated circuits

Details Closed-loop/dimming ballast controller integrated circuits Closed-loop/dimming ballast controller integrated circuits

1998-02-12

1999-12-28

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315244, 315194, 315DIG7, 315DIG4, G05F 100

Patent

active

060085932

ABSTRACT:
A novel monolithic electronic ballast controller IC for driving two MOS gated power semiconductors, such as power MOSFETs or IGBTs, connected in a totem pole or half-bridge arrangement. Advantageously, the present invention provides programmable preheat time and current, programmable end-of-life protection, lamp fault protection, over-temperature protection. The first embodiment of the invention is a closed-loop ballast controller IC intended for multiple lamp configurations, with three current-sensing inputs and programmable lamp power. Closed-loop control is accomplished through phase control, or, more specifically, a phase-locked loop (PLL) around a resonant type output stage driving a fluorescent lamp. The second embodiment of the present invention has a similar architecture to that of the first embodiment, with some modifications which allow dimming down to low light levels.

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