Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2004-07-01
2008-09-02
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S225000, C315S2090SC, C315S307000, C315S294000
Reexamination Certificate
active
07420333
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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Hamdad Fatemeh
Notohamiprodjo Hubertus
Marvell International Ltd.
Vo Tuyet
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