Fluorescent light control

Details Fluorescent light control Fluorescent light control

2008-04-14

2010-10-12

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S246000, C315S291000, C315S360000, C315SDIG002, C315SDIG002

Reexamination Certificate

active

07812544

ABSTRACT:
Circuitry, which is compatible with incandescent light dimmers, is disposed within the screwbase of a compact fluorescent light, and sets driving frequencies for a mercury plasma, based, at least in part, on sensing the duty cycle of the incoming AC supply waveform. In this way, existing lighting infrastructure, including phase-cut dimmer circuits for incandescent light bulbs, may be preserved, and incandescent bulbs can be replaced with compact fluorescent lights equipped with circuitry in accordance with the present invention. In a further aspect, the circuitry synchronizes the bulb drive signals with the AC power line frequency.

REFERENCES:
patent: 5751115 (1998-05-01), Jayaraman et al.
patent: 6172466 (2001-01-01), Ki et al.
patent: 7667408 (2010-02-01), Melanson et al.

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