Transformerless power circuit

Details Transformerless power circuit Transformerless power circuit

1989-08-22

1990-11-27

Mis, David

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

3151694, H05B 4114, G09G 310

Patent

active

049738828

ABSTRACT:
A transformerless power circuit for heating a filament of a fluorescent display comprises integrated circuit timing means comprising two timers having output terminals for developing alternating output signals of opposite polarity with respect to a d.c. bias-component of each output signal. The circuit also includes external resistor means, condenser means and voltage supply means for controlling the frequency of the timers. The circuit also includes d.c. bias component resistor means coupled to the output terminals for developing biascomponents of the same polarity at the display filament terminals with respect to a common reference potential for connection to a fluorescent display filament.

REFERENCES:
patent: 3553525 (1971-01-01), McGuirk, Jr.
patent: 4014013 (1977-03-01), McElroy
patent: 4158794 (1979-06-01), Sandler
patent: 4209729 (1980-06-01), McElroy
patent: 4591728 (1986-05-01), Kruger et al.
patent: 4719389 (1988-01-01), Miesterfeld
"LM556/LM556C Dual Timer", National Semiconductor Corporation Linear Databook 3; 1988 Edition; pp. 5-46 to 5-49.

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