High voltage protection circuit

Details High voltage protection circuit High voltage protection circuit

H - Electricity

01

J

350/109

H01J 29/70 (2006.01) H04N 3/20 (2006.01)

Patent

CA 1096492

RCA 71,716 HIGH VOLTAGE PROTECTION CIRCUIT Abstract Of The Disclosure 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. - 1 -

303115

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