| 摘要 |
PURPOSE:To utilize an input unstable rectification voltage to stop surely oscillation when an arc is generated between the charging part of the deflecting yoke of a TV receiver and the chassis. CONSTITUTION:Constant-voltage circuit 23 makes the unstable recfification voltage of input terminal 1 constant and supplied +B voltage to a horizontal deflecting circuit and supplies the divided vosltage to horizontal oscillator circuit 22. When horizontal output transistor 13 is turned off, deflecting yoke horizontal winding (DY) 19 and capacitor 18 are resonated, and a high voltage is generated at the collector of transistor 13. Though the voltage of horizontal deflecting circuit 22 is lowered when an arc is generated between the collector and the chassis, a Zener voltage of a Zener diode is generated due to the unstable rectification voltage of input terminal 1 to turn on transistors 11 and 12 which are subjected to thyristor connection through diode 24, and a current over the holding current is flowed to turn on always transistor 13, thereby stopping horizontal oscillation to prevent the arc. |
