High voltage disabling circuit for a television receiver

Details High voltage disabling circuit for a television receiver High voltage disabling circuit for a television receiver

1979-10-01

1980-11-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358243, H01J 2970

Patent

active

042348293

ABSTRACT:
A deflection generator develops scanning current in a horizontal deflection winding. A high voltage winding of a flyback transformer generates a high voltage for the picture tube ultor terminal. A high voltage safety circuit includes a flyback transformer secondary winding for applying a peak detected retrace pulse voltage to a disabling latch circuit. If the high voltage exceeds predetermined values, the latch is energized and disables normal operation of the deflection generator. Components of the sustaining current that maintains the latch in a regeneratively conducting state are derived from two voltage sources, with the current component derived from one of the two voltage sources by itself insufficient to maintain the latch in the regeneratively conducting state.

REFERENCES:
patent: 4042859 (1977-08-01), Kashiwagi
patent: 4045742 (1977-08-01), Meehan et al.
patent: 4047078 (1977-09-01), Meehan
patent: 4145639 (1979-03-01), Willis

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