Power Supply for a deflection circuit operating at multi-scan fr

Details Power Supply for a deflection circuit operating at multi-scan fr Power Supply for a deflection circuit operating at multi-scan fr

1998-08-07

2000-09-05

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315395, 315408, G09G 104, H01J 2970

Patent

active

061148172

ABSTRACT:
A television apparatus set has the capability of selectively displaying picture information obtained from a broadcast television signal and a display monitor data signal. A zero voltage switching switch mode power supply generates a higher voltage B+ supply voltage for a horizontal deflection circuit output stage, when the deflection circuit output stage operates at a rate greater than or equal to approximately 32 KHz. A series-pass regulator power supply generates at a common supply terminal a lower voltage B+ supply voltage, when the deflection circuit output stage operates at a lower rate equal to approximately 16 KHz. During a start-up interval, the horizontal scanning output stage is supplied with the lower B+ supply voltage regardless of the scan frequency for reducing excessive stress in the horizontal output stage switching transistor to improve reliability.

REFERENCES:
patent: 4516169 (1985-05-01), Truskalo
patent: 4588929 (1986-05-01), Wedam et al.
patent: 4633146 (1986-12-01), Bagcock et al.
patent: 4645990 (1987-02-01), Willis
patent: 4651214 (1987-03-01), Rodriguez-Cavazos
patent: 4829414 (1989-05-01), Yook
patent: 4831311 (1989-05-01), Yug
patent: 5089947 (1992-02-01), Driscoll et al.
patent: 6011706 (2000-01-01), Adragna et al.

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