High voltage regulator for CRT display

Details High voltage regulator for CRT display High voltage regulator for CRT display

1990-12-27

1991-10-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315408, H01J 2970

Patent

active

050598740

ABSTRACT:
A horizontal deflection and high voltage regulation system for CRT displays and television receivers utilizes a single horizontal output transistor driving a conventional deflection yoke and high voltage transformer. A diode modulator and pulse width modulating system is coupled to the horizontal deflection yoke to provide control of horizontal scan size. A separate diode modulator and pulse width modulator is coupled to the horizontal transformer. A comparator is coupled to a resistive high voltage divider to produce an error voltage indicative of CRT anode voltage. The error voltage thus developed is applied to the diode modulator and pulse width modulator operative upon the high voltage transformer to control high voltage in response to changes of CRT beam current loading imposed thereon.

REFERENCES:
patent: 4614899 (1986-09-01), Webb et al.
patent: 4965496 (1990-10-01), Haferl

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