| 摘要 |
A horizontal deflection circuit includes a horizontal deflection winding coupled to a retrace capacitor to form a retrace resonant circuit, during a retrace interval. An S-shaping capacitor is coupled to the deflection winding to form a first trace resonant circuit that includes the deflection winding and the S-shaping capacitor, during a trace interval. A first switching transistor is responsive to a synchronizing first signal at a frequency related to a horizontal deflection frequency and coupled to the deflection winding for generating a deflection current in the deflection winding synchronized to the synchronizing signal. A second switching transistor is responsive to the first signal and having a first switching state, during a first portion of said trace interval, and a second switching state, during a second portion of the trace interval. The second switching transistor couples the S-shaping capacitor to a modulation inductance and to a modulation capacitor to form a second trace resonant circuit, during the second portion of the trace interval. The length of the second portion of the trace interval is modulated at a vertical rate parabolic manner for modulating a current in the S-shaping capacitor to provide modulated S correction.
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