Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-12-23
1988-08-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315371, H01J 2970, H01J 2976
Patent
active
047615869
ABSTRACT:
A deflection circuit for a video apparatus that operates at multiple line rate deflection frequencies includes an S-shaping correction circuit that provides proper S-shaping of the line deflection current at any of the video apparatus line rate operating frequencies. A first S-shaping capacitor is in series with the deflection winding and also in series with a transformer primary winding. The transformer secondary winding is coupled to one or more capacitors. The secondary winding side capacitors are coupled to the secondary winding circuit in response to a line rate frequency indicative signal in order to form a series combination of the primary and secondary side capacitors. The effective capacitance of the secondary side capacitor is then equal to the actual capacitance value increased by a factor determined by the transformer secondary to primary winding turns ratio.
REFERENCES:
patent: 4234824 (1980-11-01), Den Hollander
patent: 4501995 (1985-02-01), Olmstead et al.
patent: 4695774 (1987-09-01), Gent et al.
patent: 4705993 (1987-11-01), Kashiwagi
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
RCA Licensing Corporation
Whitacre Eugene M.
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