Mixed mode control for dimmable fluorescent lamp

Details Mixed mode control for dimmable fluorescent lamp Mixed mode control for dimmable fluorescent lamp

2011-04-12

2011-04-12

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315S247000, C315S291000, C315S307000

Reexamination Certificate

active

07923939

ABSTRACT:
A mixed mode control for dimmable fluorescent lamp provides a smooth and continuous control of output of the lamp. A load threshold, below which the output of the discharge lamp could not be effectively controlled by the conventional frequency control, is determined. During the dimming of the discharge lamp, when the load is not lower than the load threshold, the conventional frequency control is employed. However, when the load is lower than the load threshold, a complementary duty cycle control is used.

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