Method and apparatus for protection of EHT and/or scan output st

Details Method and apparatus for protection of EHT and/or scan output st Method and apparatus for protection of EHT and/or scan output st

1995-07-21

1997-07-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

348372, 315408, H01J 2970

Patent

active

056506961

ABSTRACT:
Protection of EHT and/or scan output stages in multiscan displays is provided without the use of additional components within the power supply other than those required to perform the power supply function itself. Operation is non-dissipative, conserving power. A drive control signal is AC coupled. The switch is on during retrace of the flyback pulse. The drive control signal is varied in accordance with the load, becoming active longer and longer periods of time with increasing load until the control signal vanishes (becomes continuously asserted), turning off the switch. In accordance with a further feature of the invention, feedback to a controlling integrated circuit concerning an overload condition may be achieved without dedicating a line or pin to a separate feedback signal.

REFERENCES:
patent: 4954758 (1990-09-01), Rusk
patent: 5276604 (1994-01-01), Messman

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