| 摘要 |
<p>A controllable switch 14 is coupled to a source 10 of unregulated direct voltage and in a closed loop with a filter inductor 16 and a storage capacitor 18 and has its on-off state controlled at the horizontal deflection rate, e.g. by deflection circuit 22, to control the voltage across the capacitor. A diode 24 is coupled with the filter inductor and storage capacitor to form a second series circuit through which current can continue to (ow in the inductor 16 when the controllable switch is opened. The controllable switch is used to regulate the voltage applied to the horizontal deflection circuit 22. A turn-off winding couples a retrace pulse to the switch 14 during each horizontal retrace interval in preparation for the following regulation interval. The current variations in the filter inductor cause the diode to become nonconductive at times, thereby changing the average time during which the filter inductor parallels the deflection winding and varying the retrace pulse duration in such a manner as to improve the regulation. <IMAGE></p> |
