High voltage shutdown circuit with current feedback for cathode

Details High voltage shutdown circuit with current feedback for cathode High voltage shutdown circuit with current feedback for cathode

1979-10-24

1981-09-01

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358190, H04N 568

Patent

active

042875358

ABSTRACT:
An X-radiation protection circuit in a television receiver which permits safe operation at higher voltages and beam currents with corresponding increased video presentation brightness without the production of hazardous X-radiation by means of a control loop in which current in the high voltage sweep transformer generates a feedback signal to a conventional shutdown circuit. Excessive transformer current evidencing high electron beam current automatically lowers the turn-on voltage of the shutdown circuit providing for CRT operation at maximum safe high voltage levels and electron beam currents in accordance with "Isodose" safety curves for CRT operation.

REFERENCES:
patent: 4045742 (1977-08-01), Meehan et al.

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