Cathode ray tube display with combined degauss and surge limitin

Details Cathode ray tube display with combined degauss and surge limitin Cathode ray tube display with combined degauss and surge limitin

1987-03-18

1988-09-06

Moore, David K.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

361150, H04N 929, H01J 2906

Patent

active

047695773

ABSTRACT:
A color cathode ray tube display includes a degauss coil and a switched mode power supply. The degauss coil is connected in series with the input rectifier (5) of the SMPS to limit the current surge on power on but is shorted out by a switch, preferably constituted by a triac, after the SMPS switching transistor turns on to give substantially zero residual degauss current. Forward voltage drop across the triac can be compensated for by back-to-back diodes (13) connected in series with the degauss coil. The triac is switched under control of a signal from an auxiliary winding on the SMPS output transformer (a).

REFERENCES:
patent: 3433993 (1969-03-01), Norley
patent: 3733524 (1973-05-01), Cooksey et al.
patent: 4295078 (1981-10-01), Wilmarth
patent: 4441052 (1984-04-01), Willis
patent: 4445072 (1984-04-01), Fredres
patent: 4489253 (1984-12-01), Godawski
patent: 4636911 (1987-01-01), Truskalo

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