Circuit for controlling power supplied to a cathode heater of a

Details Circuit for controlling power supplied to a cathode heater of a Circuit for controlling power supplied to a cathode heater of a

1997-12-15

2000-07-04

Shingleton, Michaal B.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

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

315107, 327550, H05B 3702

Patent

active

060843551

ABSTRACT:
A cathode heater of a cathode ray tube is rapidly energized either when turning on electric power or when returning to a power-on state mode of the Display Power Management System (DPMS) in an electronic appliance using the cathode ray tube as a video display device. A high voltage generation unit is provided for generating a voltage higher than a rated voltage of the cathode heater of the cathode ray tube. The cathode ray tube enables a stable video display to be presented in a shorter time period due to a rapid heating of the cathode caused when an initial heating unit applies a voltage to the cathode heater which is higher than the rated voltage of the cathode heater, according to a pulse signal which exists for a predetermined time period when turning on electric power or when returning to a power-on state mode of the DPMS. A voltage drop unit is provided to drop the voltage of the high voltage generation unit to the rated voltage of the cathode heater when the predetermined time period elapses so that the cathode heater is thereafter energized with the rated voltage for that cathode heater, in order to maintain the cathode at a normal operating temperature.

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