Microprocessor-controlled screen voltage generation circuit

Details Microprocessor-controlled screen voltage generation circuit Microprocessor-controlled screen voltage generation circuit

1997-03-21

1998-01-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

348730, H01J 2970

Patent

active

057059012

ABSTRACT:
A circuit for generating a screen voltage is provided. The circuit employs an operational amplifier and two NPN transistors and receives an analog control signal from a microprocessor. The analog control signal is input to the negative input terminal of the operational amplifier. The output screen voltage is taken at emitter of one NPN transistor. In one preferred embodiment, Vcc is taken at a primary side of a high voltage transformer within the display device and input to the collector of the one NPN transistor.

REFERENCES:
patent: 4692669 (1987-09-01), Black et al.
patent: 5459378 (1995-10-01), Kato et al.
patent: 5463288 (1995-10-01), George et al.

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