Abstract: In computer monitors having a picture tube, it may be seen that a small white picture area is displayed with the same white value as a large white picture area. If it were intended to achieve the same result for a television receiver with a picture tube, a voltage supply is necessary in which the power is permitted to fluctuate between 60 and 300 watts given a stable output voltage. On account of the lower luminous efficiency, this effect would have considerably intensified repercussions on the power consumption of plasma screens. The invention is based on the object of providing a simplified method for regulating the picture power in a television receiver. The method according to the invention is distinguished by the following steps. The power consumption of the picture power is obtained by the video voltage R, G, B. The video voltage is converted into an information item which is then a measure of the picture power. This information item is subsequently fed to two regulating loops.

Abstract: The circuit for stabilizing a high voltage for a picture tube comprises a high-voltage transformer, which has a primary winding and a high-voltage winding, a switch, which is connected in series with the primary winding, and a control loop for high-voltage stabilization. The control voltage of the control loop, with which the switch is driven, is derived from two signals in this case. The first signal is tapped off from a secondary auxiliary winding at the transformer and supplies a static control voltage component, and the second signal is derived directly from the high voltage and supplies a measure of the dynamic loading on the high-voltage generator. The static control voltage component is, in particular, a measure of the value of the high voltage during the vertical line flyback, when the screen is black and the high-voltage transformer is minimally loaded. In this case, the auxiliary winding supplies a voltage which is proportional to the secondary flyback pulse.