Fluorescent lamp electronic ballast

Details Fluorescent lamp electronic ballast Fluorescent lamp electronic ballast

2006-08-22

2006-08-22

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315S307000

Reexamination Certificate

active

07095185

ABSTRACT:
A fluorescent lamp electronic ballast includes a power factor correction flyback circuit and an inverter ballast circuit. The power factor correction flyback circuit is composed of a rectifier connected to a DC to DC flyback converter. The flyback converter includes a flyback transformer connected to a diode/capacitor combination. The flyback transformer is switched during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor. The inverter ballast circuit receives the DC output and converts the DC output to an AC signal for operating the flourescent lamp.

REFERENCES:
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patent: 5907223 (1999-05-01), Gu et al.
patent: 6034489 (2000-03-01), Weng
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patent: 6703796 (2004-03-01), Che-Chen et al.
patent: 6788557 (2004-09-01), Phadke
AN1059 “Design Equations of High-Power-Factor Flyback Converters Based on the L6561” by Claudio Adragna, ST Electronics, Mar. 2000.
AN1060 “Flyback Converters With the L6561 PFC Controller” by C. Adragna & G. Gattavari, ST Electronics, Jan. 2000.
AN1089 “Control Loop Modeling of L6561-Based TM PFC” by Claudio Adragna, ST Microelectronics, Mar. 2000.

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