Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1980-09-15
1982-12-07
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315411, H01J 2970
Patent
active
043629741
ABSTRACT:
A transistor horizontal deflection circuit is energized from a source of unregulated direct voltage derived from the power mains but is conductively isolated therefrom. A switching voltage regulator couples the direct voltage source to the horizontal deflection circuit. The regulator includes a controllable switch serially coupled with the primary winding of a transformer and the source. The switch is controlled to maintain a constant voltage or energy level in the horizontal deflection circuit. A secondary winding conductively isolated from the primary is coupled across the deflection winding for forming a path for bidirectional current flow. The horizontal output transistor is coupled in parallel with the deflection winding for producing retrace pulses which are coupled to the primary winding for reducing the current in the controllable switch to zero during the retrace interval.
REFERENCES:
patent: 3999102 (1976-12-01), Gent et al.
patent: 4034262 (1977-07-01), Dietz
patent: 4037137 (1977-07-01), Dietz
patent: 4143306 (1979-03-01), Shepherd
patent: 4146823 (1979-03-01), Dietz
"Comparison of Transistor and SCR Deflection Circuits for Color Television", by Dietz et al., IEEE Transactions on Consumer Electronics, vol. CE-22, No. 4, pp. 357-366, Nov. 1976.
Hubler Malcolm F.
Laks Joseph
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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