Voltage regulator circuit for use in a programmable message disp

Details Voltage regulator circuit for use in a programmable message disp Voltage regulator circuit for use in a programmable message disp

1988-04-26

1990-05-01

Brier, Jeffery A.

Communications: electrical

Visual indication

Movable

340811, 3151691, G09G 300

Patent

active

049222430

ABSTRACT:
A voltage regulator circuit provides an economical approach for maintaining the RMS filament voltage of vacuum fluorescent tubes within an acceptable voltage range during input supply voltage variations. The regulator circuit includes substantially identical upper and lower clipper circuits which clip the AC voltage of a step-down transformer secondary. The supply voltage is allowed to vary so that the secondary voltage is outside of the acceptable range of voltage defined by substantially identical voltage reference circuits. Each of the voltage reference circuits is coupled to its respective clipper circuit and to the center tap of the secondary winding of the transformer so that the regulator circuit and the clipped output voltage are symmetrical about the center tap. Th regulator circuit is simple and power-efficient while keeping the filament voltage within the acceptable range of voltages.

REFERENCES:
patent: 4109180 (1978-08-01), Ogle et al.
patent: 4472660 (1984-09-01), Knothe et al.
patent: 4495445 (1985-01-01), Turney

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