Importance

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Abstract

Deflection apparatus for a raster scanned cathode ray tube display comprises a flyback circuit (T2,T4,Ly,Df,Cf) including a switch (T2,T4) connected in series with an inductor (Ly). The switch (T4) is responsive to a line drive signal (LINE) to alternately open and close a current path through the inductor (Ly) between a first voltage level (B+) and a second voltage level (0V) lower than the first voltage level (B+) to generate a raster scan current signal in a deflection coil of the display. The amplitude of the raster scan signal is determined as a function of the first voltage level (B+) and the frequency of the line drive signal (LINE). A feedback circuit (D2,R3,D3,C2) connected to the switch (T4) generates a feedback signal (F) as a function of current flowing out of the switch (T4). A regulator (600-630,T3,L,D1,C1) is connected to the flyback circuit (T2,T4,Ly,Df,Cf) for varying the first voltage level (B+) as a function of the feedback signal (F) to maintain a constant raster scan width despite variations in the frequency of the line drive signal (LINE).

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First Claim