Television receiver power supply regulation responding to...

Details Television receiver power supply regulation responding to... Television receiver power supply regulation responding to...

H - Electricity

04

N

350/102, 350/109

H04N 5/63 (2006.01) H02M 3/335 (2006.01)

Patent

CA 1213366

ABSTRACT The raster scanned by a television receiver deflection circuit (36) is subject to an increase in size resulting from a decrease in high voltage level caused by increasing electron beam current. The receiver comprises a switched mode power supply (16) producing a voltage that is used to power the deflection circuit (36) and generate the high voltage. The voltage supply level incorporates an ac ripple component caused by loading on the supply due to increasing beam current. A peak detector (69) senses the peak level of the voltage supply and applies it to a regulator control circuit (52) which maintains the peak level of the supply voltage constant. Increasing beam current loads the supply, decreasing the average dc voltage level applied to the deflection circuit (36), thereby decreasing the electron beam scan to compensate for a reduction in high voltage level.

443835

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