| 摘要 |
PURPOSE:To suppress fluctuation of a high voltage and fluctuation of an AC input voltage with simple circuit constitution by detecting a high voltage generated at a secondary winding of a flyback transformer and controlling a conduction time of a switch means applying a DC voltage selectively to a switching circuit accordingly. CONSTITUTION:The generating circuit is provided with a voltage resonance type switching circuit 1 including a flyback transformer FBT, a power supply circuit 2 generating a prescribed DC voltage, a switch means Q2 applying the DC voltage selectively to the switching circuit 1, a detection means D2 detecting a high voltage generated in a secondary winding of the flyback transformer FBT, and a phase control means 5 controlling the conduction time of the switch means Q2 in response to the detected output by the detection means D2. Thus, a voltage resonance type high voltage generating circuit able to suppress the fluctuation of a high voltage and fluctuation of an AC input voltage with simple circuit constitution is realized. |
