High voltage stabilizing circuit for use in color television rec

Details High voltage stabilizing circuit for use in color television rec High voltage stabilizing circuit for use in color television rec

1993-06-10

1995-02-28

Groody, James J.

Television

Camera, system and detail

Cathode-ray tube

348377, H04N 3185

Patent

active

053941888

ABSTRACT:
An anode voltage (high voltage) of a CRT is detected by a voltage division. When it is detected by a comparator that the reduction of the high voltage has exceeded the controlled range of a high voltage stabilizing loop, two switches will be on. When one switch is on, the controlling end of a processing circuit controlling the luminance will be low in the potential and the direct current level or amplitude of a video signal will be limited. Thereby, the luminance will be controlled and the high voltage will become high. Meanwhile, when the other switch is on, the ABL operating voltage will forcibly become low and, even after the two switches become off, the average level of the luminance will be controlled. Thereby, the high voltage will return within a short time into the controlled range of the high voltage stabilizing loop and will be stabilized.

REFERENCES:
patent: 4901156 (1990-02-01), Yook
patent: 4996590 (1991-02-01), Okamoto et al.

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