| 摘要 |
PURPOSE:To reduce the influence of switching noises to a display screen by using s pulse obtained by controlling a horizontal deflecting signal via a phase control means to perform a switching action. CONSTITUTION:A DC current is supplied to a winding 31 of a switching regulator 1 from a terminal B and fed back to a terminal C via a switching transistor TR4. An AC current produced at a winding 33 is rectified by a rectifier 7 and then smoothed by a capacitor 8 to be supplied to a display device 2. The horizontal deflecting signal supplied through a terminal A is supplied to a horizontal deflecting circuit 9 of the display 2 and at the same time undergoes phase control through a phase control means 13. Then the TR4 is turned on and off via a transformer 11. Thus it is possible to limit the generating position of the switching noises of a switching regulator 2 to such a place on a display screen where the influence of said noises is reduced. |
