Patent ID: 6605909
Filing Date: 2003-08-12
Classification: H04N

Abstract:
A deflection apparatus with raster distortion correction, comprising:a deflection winding; a retrace, first capacitance coupled to said deflection winding to form a retrace resonant circuit with said deflection winding, during a retrace interval; a trace, second capacitor coupled to said deflection winding to form a trace resonant circuit with said deflection winding, during a trace interval; a source of a synchronizing signal at a frequency related to a first deflection frequency; a first switching semiconductor responsive to said synchronizing signal and coupled to said deflection winding and to said retrace first capacitance to generate a first retrace pulse voltage in said retrace first capacitance, during said retrace interval, and a deflection current in said deflection winding; a charge holding, third capacitance; a sampling switching semiconductor responsive to said first retrace pulse voltage and coupled to said third capacitance for sampling said first retrace pulse voltage and for developing a sampled voltage from a charge stored in said third capacitance that is indicative of a magnitude of said first retrace pulse voltage; and a first inductance coupled to said third capacitance for applying said sampled voltage to said first inductance, during said trace interval, to generate a current in said first inductance, said first inductance current being coupled to said trace, second capacitor for varying, in accordance with said first inductance current, a trace voltage in said second capacitor to provide raster distortion correction.