Television receiver high voltage protection circuit

Details Television receiver high voltage protection circuit Television receiver high voltage protection circuit

1980-12-15

1983-06-21

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 74, 315411, 331167, H04N 568

Patent

active

043896766

ABSTRACT:
In a television receiver horizontal deflection circuit, the deflection circuit oscillator includes an LC resonant tank network that is excited into sustained oscillation to develop an oscillator alternating output signal. A high voltage generator is responsive to the oscillator output signal and develops a picture tube ultor voltage at an ultor terminal. An ultor voltage representative signal is applied to the input of a disabling latch circuit of a television receiver high voltage protection circuit. First and second diodes are coupled across the inductive portion of the oscillator tank network, with the cathodes of the two diodes being coupled together at a junction in common with the output terminal of the disabling latch. If the ultor voltage exceeds a predetermined level, the latch is energized, forward biasing both diodes to provide a short-circuit across the tank network. Sustained oscillation of the tank network is stopped and the oscillator alternating output signal is removed to disable operation of the high voltage generator.

REFERENCES:
patent: 3813580 (1974-05-01), Norman
patent: 3840784 (1974-10-01), Schauffele
patent: 4042859 (1977-08-01), Kashiwagi
patent: 4045742 (1977-08-01), Meehan et al.
patent: 4082986 (1978-04-01), Gamboa
patent: 4241296 (1980-12-01), Barter
patent: 4263615 (1981-04-01), Steinmetz et al.
"The CTC-85 Color Chassis Technical Manual", Prepared by RCA Corporation, Indianapolis, Indiana, Copyright 1977.

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