| 摘要 |
PURPOSE:To prevent the break of a horizontal deflecting circuit and a horizontal synchronizing signal source by supplying the pulse voltage generated in the secondary winding of a transformer device, whose primary side the pulse current from the horizontal deflecting circuit flows to, to a switching transistor TR as the voltage for switching of a high voltage generating part. CONSTITUTION:In a switching circuit, the pulse voltage obtained from an auxiliary winding 6 is given to the gate of a switching FET 21. The anode voltage is high and several kv. to the earth but is divided by a voltage dividing resistor 25, and the voltage generated in a tap D is low and <=10v. to the earth. That is, the anode voltage is reduced when a high-voltage load current is increased. A control circuit 26 increases the base current of a TR 22. Then, the collector current of the TR 22 is increased, and the oscillating current flowing to a primary winding 16 is increased to raise the voltage generated in the secondary winding of a transformer 15. Consequently, the anode voltage is stabilized. |
