Power supply for an electrode of a CRT

Details Power supply for an electrode of a CRT Power supply for an electrode of a CRT

1990-04-13

1991-07-23

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, H01J 2970, H04N 563

Patent

active

050346660

ABSTRACT:
To produce a cathode voltage of a cathode ray tube that provides black level compensation, a secondary winding of a flyback transformer is coupled in series with a resistor, a capacitor and a rectifying diode. During flyback, a voltage pulse is developed across the capacitor at a magnitude that is increases when the average value of the beam current increases. The voltage pulse causes the cathode voltage to first decrease when the beam current increases.

REFERENCES:
patent: 4649325 (1987-03-01), Guerin et al.
patent: 4812720 (1989-03-01), Haferl
A Color Television Service Data Manual, publ. 1987 for CTC 140 Television Chassis, a schematic page and a cover sheet.
A Color Television Service Data Manual, publ. 1987 for CTC 131 Television Chassis, a schematic page and a cover sheet.

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