High voltage protection circuit

Details High voltage protection circuit High voltage protection circuit

1977-05-13

1978-11-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, 358243, H01J 2970

Patent

active

041268164

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.

REFERENCES:
patent: 3535445 (1970-10-01), Griffery
patent: 3879649 (1975-04-01), Durecka
patent: 4047078 (1977-09-01), Meehan

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