Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1992-03-27
1995-02-28
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
363 21, H01J 2970
Patent
active
053940679
ABSTRACT:
An improved regulated flyback high DC voltage output supply, particularly adapted for providing the anode voltage to a CRT, includes a flyback transformer having its output winding connected to a improved regulator of the type including a string of transistors used to provide a correction signal for stabilizing the output of the supply. The regulator also includes a plurality of Zener diodes, each connected in parallel with a corresponding one of the transistors for providing surge protection for the transistors and for providing an alternate current path to the corresponding transistor, depending on the level of the correction signal.
Additional aspects of the invention include protection of the regulator circuit from damage caused by arcs occurring across the CRT load to ground; a regulator design adapted to operate from a single power supply; easy adaptation so that a voltage proportional to CRT anode load current can be provided for external circuits to sense and use for automatic brightness control or limiting; an improved case so as to eliminate output voltage disturbances caused by corona discharges from the regulator's case; and automatic programming of the regulated dc output voltage to better accommodate component tolerances in production.
REFERENCES:
patent: 3729575 (1973-04-01), Harding et al.
patent: 4293903 (1981-10-01), Mochida et al.
patent: 5043598 (1991-08-01), Maeda et al.
Blum Theodore M.
Discom Inc.
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