Device for driving directly heated cathode of cathode ray tube

Details Device for driving directly heated cathode of cathode ray tube Device for driving directly heated cathode of cathode ray tube

1995-12-21

1998-04-28

Pascal, Robert

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315105, 315411, H01J 2998

Patent

active

057449112

ABSTRACT:
A device for driving a directly heated cathode of a cathode ray tube eliminating a delay due to inductance of a transformer. A transformer that produces the heater-heating signal voltage applied to the cathode includes a secondary coil divided into first and second coils. The voltage induced in the first coil is used for the heater-heating voltage and the signal induced in the second coil is synchronized with the voltage induced in the first coil and used as a bias voltage for turning on and off a switching element in synchronization with the heater-heating voltage. The switching element turns on only when the heater-heating signal voltage is applied to a control terminal of the switching element.

REFERENCES:
patent: 5130606 (1992-07-01), Morrish et al.

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