Shutdown circuit for video monitor

Details Shutdown circuit for video monitor Shutdown circuit for video monitor

1985-04-08

1988-06-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315383, 358243, H01J 2952, H04N 568

Patent

active

047499192

ABSTRACT:
In a horizontal drive circuit for a video display, means are provided for sensing the horizontal output pulse used to energize the high voltage sweep transformer and, in turn, the electrodes and deflection coils in a cathode ray tube (CRT). Horizontal output pulse height which represents not only the voltage applied to the CRT, but also retrace pulse duration is detected and utilized to terminate the video output when the horizontal pulse voltage level exceeds a predetermined value. Because this approach uses the collector pulse output of the horizontal output transistor to detect high voltage conditions, video shutdown during unsafe CRT operation is available not only for excessive peak voltage conditions, but also for improper retrace time operation due, for example, to sweep transformer malfunction.

REFERENCES:
patent: 3795767 (1974-03-01), Waltner et al.
patent: 4082986 (1978-04-01), Gamboa
patent: 4090111 (1978-05-01), Suzuki
patent: 4126816 (1978-11-01), Willis
patent: 4213166 (1980-07-01), Watanabe
patent: 4287535 (1981-09-01), Vakil

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