Pulse width modulator for a television receiver

Details Pulse width modulator for a television receiver Pulse width modulator for a television receiver

1980-11-10

1982-03-02

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 358180, H01J 2970, H01J 2976

Patent

active

043180361

ABSTRACT:
A pulse width modulator is described for width-modulating horizontal rate pulses developed in a television receiver and for applying the width-modulated pulses to the receiver's horizontal drive system. In the illustrated embodiment, the modulator includes a differential amplifier which senses the receiver's high voltage and beam current to develop a control signal which varies in accordance with variations in the beam current and the high voltage. A second differential amplifier receives the control signal and horizontal rate pulses for developing pulses whose width is varied in response to variations in the control signal. The width-modulated pulses cause the horizontal drive system to generate a substantially constant horizontal picture size despite variations in line voltage and brightness.

REFERENCES:
patent: 3992648 (1976-11-01), Avery
patent: 4225809 (1980-09-01), Ogawa et al.

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