| 摘要 |
PURPOSE:To generate a horizontal deflection current and a high voltage output stably, by detecting a saw tooth wave current for horizontal deflection flowing to a horizontal deflection coil at a detecting transformer, and controlling a trigger phase in response to the detected level. CONSTITUTION:The 1st saw tooth wave current generating circuit consists of a circuit connecting the horizontal deflection coil 40 and a capacitor 41 in series and of a diode 35 and a capacitor 36 in parallel. The 2nd saw tooth wave current generating circuit consists of a circuit connecting a modulation coil 47 and a capacitor 46 in series, a diode 44, a capacitor 45, a series circuit of a switching control element 39 and a coil 38 connected in parallel with the coil 40. Further, a detection circuit which detects a current or a blanking pulse of the 1st saw tooth wave current generating circuit by supplying a DC voltage source to a terminal of a switching control element 31, is provided, and a control circuit 51 controls the conductive period of the element 49 in response to the detected output to stabilize the horizontal deflection current and the flyback pulse. |
