Stray emission reduction circuit

Details Stray emission reduction circuit Stray emission reduction circuit

1997-05-01

1999-06-22

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315380, 315408, H04N 563, H04N 568, H04N 316, G09G 104

Patent

active

059145749

ABSTRACT:
The most popular method for reducing stray emission effects in a cathode ray tube is to install a bleeder resistor at the flyback transformer of the tube. Such a bleeder resistor is, however, quite expensive. Therefore, the stray emission reduction circuit according to the invention differentiates the H pulse when the TV set is switched from "on" to "standby" which results in a higher duty cycle of the control transistor, implying a lower duty cycle of the horizontal output transistor HOT. This results in a lower voltage at the tuning capacitor and hence lowers the flyback peak voltage at the anode. This results in a drop of the EHT voltage.

REFERENCES:
patent: 3956669 (1976-05-01), Del Ciello
patent: 5142206 (1992-08-01), Gries
patent: 5184225 (1993-02-01), Heidebroek et al.
patent: 5266870 (1993-11-01), Jang

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