Triac dimmable, single stage compact flourescent lamp

Details Triac dimmable, single stage compact flourescent lamp Triac dimmable, single stage compact flourescent lamp

1998-03-04

1999-11-30

Philogene, Haissa

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315247, 315DIG4, 315DIG7, H05B 3702

Patent

active

059948485

ABSTRACT:
A triac dimmable compact fluorescent lamp including a power feedback circuit. The power feedback circuit helps to maintain the level of current drawn from the triac to at least the level of the triac holding current especially during low dim levels. In one preferred embodiment, the feedback circuit is fed into a junction joining together a pair of fast recovery diodes for converting the high frequency square wave signal into a unidirectional signal supplied to an inverter. Overboost voltages across a buffer capacitor are minimized during low dim levels.

REFERENCES:
patent: 4375608 (1983-03-01), Kohler
patent: 4511823 (1985-04-01), Eaton et al.
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 4808887 (1989-02-01), Fuhnrich et al.
patent: 5192896 (1993-03-01), Qin
patent: 5303140 (1994-04-01), Shimizu
patent: 5412287 (1995-05-01), Shackle
patent: 5604411 (1997-02-01), Venkitasubrahmanian et al.

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