CRT filament supply for multiple frequency video apparatus

Details CRT filament supply for multiple frequency video apparatus CRT filament supply for multiple frequency video apparatus

1987-02-27

1988-08-23

Miller, Stanley D.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315 94, 315105, H01J 1982, H05B 3900

Patent

active

047663901

ABSTRACT:
A video apparatus capable of operating at different line deflection frequencies incorporates a CRT electron gun assembly heater supply voltage circuit that maintains a constant rms voltage level independent of the line deflection frequency. The heater supply includes a transformer winding located on the line deflection driver transformer. The duty cycle of the developed AC voltage waveform remains substantially constant independent of the line deflection frequency, so that the AC voltage may be applied to the heater circuit.

REFERENCES:
patent: 3798369 (1974-03-01), Dietch
patent: 3956669 (1976-05-01), Del Ciello
patent: 4481476 (1984-11-01), Ferritsen

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