CRT protection circuit

Details CRT protection circuit CRT protection circuit

1987-07-08

1988-08-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358220, H01J 2952

Patent

active

047630469

ABSTRACT:
A CRT phosphor burn protection arrangement has an RC delay circuit coupled between the power supply and the video amplifiers for maintaining B+ potential to the video amplifiers after turn off of the power supply. The video amplifiers drive the cathodes of the CRT. A capacitor is connected between the B+ terminal of the power supply and the common control grid of the CRT for driving the control grid in a negative direction upon turn off of the power supply. The combination of the CRT cathodes being maintained positive and the CRT control grid being driven more negative assures that the CRT is held in cutoff until potential phosphor burn producing energy in the CRT is dissipated.

REFERENCES:
patent: 4217525 (1980-08-01), Nakamura et al.
patent: 4275338 (1981-06-01), Grocki et al.
patent: 4390817 (1983-06-01), Johnson

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