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.

Abstract: A high voltage protection system comprises a deflection winding, a deflection circuit for providing scanning current to the deflection winding, a high voltage circuit for providing a high voltage accelerating potential for beam current, and a beam current sensing circuit for providing a beam current signal representative of the beam current. A high voltage protection circuit is coupled to the deflection circuit and is responsive to the high voltage accelerating potential for disabling normal deflection circuit operation when the high voltage accelerating potential exceeds first predetermined values. A coupling apparatus is responsive to the beam current signal and couples a signal to the protection circuit when the beam current decreases to less than a given value for changing the magnitudes of the first predetermined values.