Raster size regulating circuit

Details Raster size regulating circuit Raster size regulating circuit

H - Electricity

04

N

350/102

H04N 3/223 (2006.01) H04N 3/185 (2006.01)

Patent

CA 1292558

Abstract A high voltage generator of a television receiver includes a high voltage transformer having primary and high voltage windings. The high voltage winding is coupled to an ultor terminal of a picture tube via a high voltage rectifier. Retrace pulses applied to the primary winding are stepped up by the high voltage winding for generating an ultor voltage. A source of supply voltage is coupled to a current resupply terminal of the high voltage winding and produces voltage pulses at the resupply terminal having amplitudes which vary in accordance with ultor voltage loading. An envelope detector is coupled to the resupply terminal for envelope detecting amplitude variations of the voltage pulses to develop a size control signal which follows loading induced variations in ultor voltage. The size control signal is coupled to a scanning current modulator, such as a diode modulator, for modulating the scanning current in a manner that regulates the raster size.

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