Raster distortion corrected deflection circuit

Details Raster distortion corrected deflection circuit Raster distortion corrected deflection circuit

H - Electricity

01

J

355/9

H01J 29/72 (2006.01) H04N 3/16 (2006.01) H04N 3/233 (2006.01)

Patent

CA 1167972

RCA 75,438 ABSTRACT OF THE DISCLOSURE An inverter applies a square-wave exciting voltage of horizontal deflection frequency to the primary winding of a ferroresonant power transformer. A square-wave alternating polarity output voltage developed across a secondary winding of the ferroresonant transformer is half-wave rectified and applied to an input choke of a horizontal deflection circuit. The input choke is coupled to the series arrangement of a horizontal deflection winding and a trace capacitor. A pincushion correction circuit switching transistor applies a DC voltage to the input choke at a controlled instant within the nonconduction interval of the half-wave rectified output voltage. The peak-to-peak horizontal scanning current is a function of the average voltage developed across the trace capacitor. This average voltage equals the average value of the voltage applied to the input choke. By varying at a vertical rate in a parabolic manner the controlled instant at which the switching transistor applies the DC voltage to the input choke, the peak-to-peak horizontal scanning current is modulated at a vertical rate in a parabolic manner to provide side pincushion correction.

380584

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