Power supply circuit for intermittently actuating a filament of

Details Power supply circuit for intermittently actuating a filament of Power supply circuit for intermittently actuating a filament of

1997-10-09

1999-07-20

Wong, Don

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

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

315209R, 315219, 315291, H05B 3702

Patent

active

059259825

ABSTRACT:
A power supply circuit for a filament of a vacuum fluorescent display includes an LC series circuit and a capacitor. A first end of the LC series circuit is connected with a secondary winding of a transformer in a switching power supply, and a second end of the LC series circuit is connected with a first end of the filament. A first end of the capacitor is connected with a second end of the filament, and a second end of the capacitor is directly or indirectly connected with a ground source. The LC series circuit and the capacitor form a series resonance circuit, thereby providing an isolated power supply for the filament of the vacuum fluorescent display.

REFERENCES:
patent: 5262699 (1993-11-01), Sun et al.

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