Television receiver high voltage protection circuit

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

H - Electricity

04

N

350/105, 350/109

H04N 5/44 (2006.01) H04N 3/20 (2006.01)

Patent

CA 1171957

RCA 75, 530 ABSTRACT OF THE DISCLOSURE 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 coupled 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.

391287

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