Raster distortion correction circuit

A video display deflection apparatus, comprising:

• first switching means responsive to a first control signal at a frequency related to a first deflection frequency and coupled to a deflection winding included in a first retrace resonant circuit for generating a deflection current;
• a first inductance coupled to an S-shaping capacitor to form a first trace resonant circuit;
• a supply inductance;
• second switching means responsive to a second control signal, varying at a frequency related to a second deflection frequency, and coupled to said supply inductance for generating a first retrace pulse voltage in said supply inductance, said first retrace pulse voltage being coupled to said first inductance for generating a modulation current in said first trace resonant circuit to provide inside pincushion raster distortion correction;
• an isolating diode for decoupling said supply inductance from said first retrace resonant circuit, during a portion of retrace;
• and
• a second inductor for coupling a supply voltage to said second switching means via a current path that excludes said supply inductance and said isolating diode to provide a current path for said modulation current, when trace begins.

A video display deflection apparatus, comprising:

• a deflection winding included in a first retrace resonant circuit, during retrace;
• a first switching transistor responsive to a first control signal at a frequency related to a first deflection frequency and coupled to said deflection winding for generating a deflection current in said deflection winding;
• a second switching transistor responsive to a second control signal for coupling a supply inductance to said first retrace resonant circuit, during a controllable portion of retrace for providing East West distortion correction;
• an isolating diode for decoupling said supply inductance from said second switching transistor, during a portion of retrace;
• and
• a first inductor coupled to an S-shaping capacitor to form a first trace resonant circuit for providing inside pincushion distortion correction, said first trace resonant circuit including a tapped inductor having a terminal that is coupled to said deflection winding, said first trace resonant circuit including a diode that is coupled in an anti-parallel manner across said second switching transistor and that is rendered conductive by a current that flows in said first trace resonant circuit, during a beginning of trace.