Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-10-01
1981-03-03
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970
Patent
active
042543657
ABSTRACT:
A side pincushion corrected deflection circuit for a television receiver includes a deflection winding, a trace capacitor and a first switch for generating scanning current in the deflection winding. A modulator circuit includes a modulator inductor, a modulator capacitance and a second switch for generating a sawtooth modulator current in the inductor. The trace and modulator capacitors are charged from a voltage source through a flyback transformer winding. Reflected load currents from other television receiver circuits also flow in the flyback transformer winding. A transistor stage in the modulator circuit shunts current away from the modulator capacitor to control the modulator and trace capacitor voltages. A vertical rate bias voltage is applied to the transistor stage and varies the shunt current at the vertical rate to provide side pincushion correction. The transistor stage is operated in an open loop manner with no voltage feedback of the modulator capacitor voltage. An additional bias voltage, representative of the load current flowing in the flyback transformer, is applied to the transistor stage in order to reduce undesirable load current modulation of the side pincushion correction.
REFERENCES:
patent: 3906305 (1975-09-01), Nillesen
patent: 3962602 (1976-06-01), Dietz
patent: 3968402 (1976-07-01), Sahara et al.
patent: 4006385 (1977-02-01), Onodera
patent: 4063134 (1977-12-01), Iida
patent: 4140949 (1979-02-01), Terry
patent: 4179642 (1979-12-01), den Hollander
Television Service Manual, 9000 Series Colour, Thorn Consumer Electronics Service Division, Nov. 1975, p. 19, & the Electrical Schematic of the 9000 Series Color Television Receiver.
Hubler Malcolm F.
Laks Joseph J.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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