| 摘要 |
PURPOSE:To hold a deflecting current invariably constant by converting the level of a flyback pulse into a DC voltage, and comparing the DC voltage with a reference voltage and controlling a voltage to be applied to a horizontal deflecting output circuit. CONSTITUTION:A fine resistance RF for current detection is inserted into the grounding side of a deflecting coil DY and a saw-tooth wave voltage developed across the resistance is converted into the DC voltage by a level detecting circuit 1. This DC voltage is compared with the reference voltage determined by a potentiometer VR1 and the voltage to be applied to a horizontal deflecting output transistor TR2 is controlled so that the voltage across the resistance RF is constant. Consequently, the current flowing through the horizontal deflecting coil DY is held constant. |
