Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1995-03-29
1996-07-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2958
Patent
active
055325580
ABSTRACT:
An active pull up arrangement coupled to a high voltage source generates an operating voltage. An amplifier for a dynamic focus modulating signal is energized by the operating voltage and has a plurality of transistors, for example low voltage transistors, coupled as Darlington pairs in a differential configuration. One of the low voltage transistors is coupled in series between a resistor in the pull up arrangement and a return supply, for example ground, in a push pull configuration. A fault condition in the push pull configuration can destroy the resistor and cause an open circuit condition. A switch, for example a diode or a Zener diode, is coupled between the one transistor of the amplifier and the supply return. The switch prevents reverse breakdown of the transistors in the event of the fault condition, until the resistor is destroyed. The resistor may be a fusible resistor.
REFERENCES:
patent: 3663860 (1972-05-01), Phillips
patent: 3868580 (1975-02-01), Battjes
patent: 4689711 (1987-08-01), Conzelmann et al.
patent: 4990832 (1991-02-01), Maninger et al.
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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