Television receiver protection circuit

Details Television receiver protection circuit Television receiver protection circuit

1977-10-27

1979-03-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358243, H01J 2970

Patent

active

041456394

ABSTRACT:
A deflection circuit of a television receiver produces scanning current in a deflection winding. The deflection circuit includes first and second terminals at which respective terminals first and second deflection rate voltages are developed. The first deflection rate voltage includes, under fault conditions, a fault component voltage present during at least a portion of a deflection cycle. The fault component voltage is substantially absent from the second deflection rate voltage. A protection circuit includes combining means coupled to the first and second terminals for combining the first and second deflection rate voltages for producing a fault signal at a third terminal under fault conditions. A circuit responsive to the voltage developed at the third terminal provides a disabling signal for disabling normal television receiver operation when the fault signal is present.

REFERENCES:
patent: 3742242 (1973-06-01), Morio et al.
patent: 3885201 (1975-05-01), Fernsler

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