Deflection circuit with a switched mode modulator circuit

Details Deflection circuit with a switched mode modulator circuit Deflection circuit with a switched mode modulator circuit

1985-07-30

1986-11-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

046251545

ABSTRACT:
A trace switch, operated at a line rate, is coupled to a line deflection winding and a trace capacitance for applying a trace voltage to the deflection winding to generate line scanning current in the deflection winding. A deflection retrace capacitance is coupled to the deflection winding for forming a deflection retrace resonant circuit during the line retrace interval to generate a deflection retrace pulse voltage. A modulator inductance is coupled to the trace switch and to the line deflection winding. A modulator switch applies a line rate, switched mode, modulation voltage directly to the modulator inductance to control the amplitude of the current in the modulator inductance at the end of the line trace interval. A modulator retrace capacitance is coupled by the modulator switch to the modulator inductance during the line retrace interval for forming a modulator retrace resonant circuit. The switched mode modulation voltage is varied at a field rate to provide side pincushion correction to the line scanning current.

REFERENCES:
patent: 4118655 (1978-10-01), Wolber
patent: 4140949 (1979-02-01), Terry
patent: 4469992 (1984-09-01), Favreau
RCA Corporation, Laboratories RCA Limited, Zurich, Switzerland, Report No. MRZ-282, date Feb. 1984, G. Forster and A. Schlussel entitled "A Horizontal Deflection and East-West Raster Correction Circuit for Operation at Twice Horizontal Rate (31.25 kHz)".

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