Method and apparatus for VF tube power supply

Details Method and apparatus for VF tube power supply Method and apparatus for VF tube power supply

1993-11-09

1995-11-21

Neyzari, Ali

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315337, 315168, 3151693, 345 75, G09G 310, H05B 4100

Patent

active

054690269

ABSTRACT:
An efficient power supply for a vacuum fluorescent display having a battery or other unregulated source supplies the grid voltage directly from the battery and supplies the anode voltage via a step-up regulator. To eliminate apparent display brightness changes upon variation of battery voltage, the battery voltage and the anode voltage are fed back to the regulator, adjusting the regulated anode voltage inversely to the battery voltage. The direct coupling of battery to the grid eliminates the necessity of regulating or converting the grid voltage, allowing a smaller power supply to be used and minimizing heat losses.

REFERENCES:
patent: 4835447 (1989-05-01), Mizuno et al.
patent: 4970441 (1990-11-01), Lippmann et al.
patent: 5283501 (1994-02-01), Zhu et al.

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