Method and apparatus for vacuum fluorescent display power supply

Details Method and apparatus for vacuum fluorescent display power supply Method and apparatus for vacuum fluorescent display power supply

1993-11-09

1995-03-28

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural diverse pulsating or a.c. supplies

3151691, 3151693, 315307, 315105, 315209R, H05B 3500

Patent

active

054020425

ABSTRACT:
A power supply for a VF display generates a DC filament voltage from a battery by either a switched transformer supply or a monolithic regulator circuit. Where a higher-than-battery voltage is needed for anode and grid voltages, another monolithic regulator circuit or the switched transformer is used. An H-switch develops an alternating voltage from the DC voltage and applies it to the display filament. A controller for the H-switch is a logic circuit including flip-flops which toggle in response to a low frequency pulsed dimmer signal to synchronize the filament half cycles with the dimmer phases. Slew rate control ramps the H-switch control signal to produce a trapezoidal waveform in the filament current having reduced radio frequency emissions.

REFERENCES:
patent: 3515938 (1970-06-01), Morse
patent: 4495445 (1985-01-01), Turney

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