Multiple scan rate deflection circuit incorporating scan...

Details Multiple scan rate deflection circuit incorporating scan... Multiple scan rate deflection circuit incorporating scan...

H - Electricity

04

N

350/105

H04N 3/16 (2006.01) H04N 3/185 (2006.01) H04N 3/27 (2006.01)

Patent

CA 1217858

ABSTRACT OF THE DISCLOSURE A video display system operates at a plurality of horizontal scanning rates. A voltage source produces different voltage levels, one of which is selected in response to the horizontal rate selected. A horizontal deflection circuit produces retrace pulses having amplitudes dependent on the scanning rate. A high voltage transformer has a primary winding with a number of taps and a secondary winding; The voltage source is connected to one of the taps in response to the horizontal deflection rate selected, so that the high voltage level developed across the transformer secondary winding remains substantially constant independent of changes in retrace pulse amplitude.

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