Drive apparatus for a vacuum fluorescent display

Details Drive apparatus for a vacuum fluorescent display Drive apparatus for a vacuum fluorescent display

2011-08-23

2011-08-23

Cho, James (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Regulator in shunt to the load device

C315S107000, C315S207000

Reexamination Certificate

active

08004212

ABSTRACT:
A VFD drive apparatus in which the filament of a VFD is coupled at a first terminal to an input voltage derived from a voltage source, and at a second terminal to a shunt voltage regulator that establishes a regulated filament current and a regulated cutoff voltage with respect to ground potential. Other electrical loads such as drive circuitry for the anodes and grid of the display are coupled between the second terminal of the filament and ground potential so that at least a portion of the filament current is supplied to such other electrical loads. Power dissipated by the shunt voltage regulator is thereby reduced, and the cost associated with providing additional voltage regulators for the other electrical loads is avoided.

REFERENCES:
patent: 5606226 (1997-02-01), Macks et al.
patent: 6531825 (2003-03-01), Iacob
patent: 6876157 (2005-04-01), Henry
patent: 7411360 (2008-08-01), Henry
patent: 7825605 (2010-11-01), Zhang et al.

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