Power supply for vacuum fluorescent displays

Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

3151694, 315260, H05B 4114, G09G 310

Patent

active

050013998

ABSTRACT:
A power supply for vacuum fluorescent displays has a source of a relatively high frequency signal which is provided to a power driver amplifier which is also supplied with a desired supply voltage. The output of the driver amplifier is a square-wave signal varying between approximately zero and the supply voltage; this signal is provided to the filament of the vacuum fluorescent display such that the filament is heated and is self-biased at a DC level which is substantially one-half the supply voltage level. Self-biasing a capacitor between the filament and ground, which also allows the RMS level of the voltage across the filament to be controlled by controlling the frequency of the output signal from the driver amplifier. The voltage may be regulated by comparing the RMS voltage across the filament with a reference and using the difference to control the frequency of oscillation of the source. A voltage multiplier may be connected to receive the square-wave output from the driver amplifier to produce a higher level DC voltage which can be used to supply the grid and plate drivers with the higher voltage needed for these elements. Two driver amplifiers may be connected together with circuitry to self-oscillate, with the outputs of the two amplifiers being connected across the filament to heat the filament and self-bias the filament at one-half the DC supply voltage level.

REFERENCES:
patent: 3553525 (1971-01-01), McGuirk, Jr.
patent: 4158794 (1979-06-01), Sandler
patent: 4209729 (1980-06-01), McElroy
patent: 4472660 (1984-09-01), Knothe et al.
patent: 4488089 (1984-12-01), Shota
patent: 4495445 (1985-01-01), Turney
patent: 4704560 (1987-11-01), Mills et al.
patent: 4719389 (1988-01-01), Miesterfeld
patent: 4791337 (1988-12-01), Murata
patent: 4835447 (1989-05-01), Mizuno et al.
NEC Electronics, Inc.--FIP--Fluorescent Indicator Panel Application Notes, 1988, pp. 57-69, 81-85, 97-102, and cover pages.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Power supply for vacuum fluorescent displays does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power supply for vacuum fluorescent displays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply for vacuum fluorescent displays will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2012519

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.