Drive circuit of fluorescent display

Details Drive circuit of fluorescent display Drive circuit of fluorescent display

2009-05-12

2011-10-25

Crawford, Jason M (Department: 2819)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S172000, C315S176000, C315S226000, C315S244000, C315S299000

Reexamination Certificate

active

08044597

ABSTRACT:
A drive circuit for a fluorescent display that can prevent generation of reactive power in a Zener diode used to generate a cutoff bias voltage. In one embodiment, the drive circuit operates as a single ended primary inductor converter (SEPIC) circuit and includes an input side closed circuit, an output side closed circuit, and a coupling capacitor connecting the two closed circuits. The input side closed circuit includes an input power source, a first inductor and a switching element. The output side closed circuit includes a second inductor, a diode and a second capacitor. A filament of the fluorescent display is connected to the second capacitor. One end of a Zener diode is connected to a negative potential side of the filament and the other end of the Zener diode is connected to an input power source.

REFERENCES:
patent: 7550934 (2009-06-01), Deng et al.
patent: 2005/0168161 (2005-08-01), Chiou
patent: 02-190893 (1990-07-01), None
patent: 2007-072323 (2007-03-01), None

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