Parabolic voltage generating circuit

Details Parabolic voltage generating circuit Parabolic voltage generating circuit

H - Electricity

04

N

350/106

H04N 3/16 (2006.01) H04N 3/233 (2006.01)

Patent

CA 2040252

ABSTRACT A parabolic voltage generating circuit includes an arrangement for generating a sawtooth vertical deflection current that flows in a vertical deflection winding, in a DC blocking capacitor and in a deflection current sampling resistor. An emitter electrode of a transistor is coupled between the deflection winding and the capacitor. A base electrode of the transistor is coupled between the capacitor and the resistance. A collector current of the transistor varies in a vertical rate parabolic manner and has a DC average value that is determined by a DC average value of a voltage that is developed in the capacitor. The collector current is applied to an East-West raster distortion correction circuit for modulating an amplitude of a horizontal deflection current.

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