| 摘要 |
PURPOSE:To reduce the size by connecting a filament to one of the secondary windings of a transformer while connecting a multistage voltage multiplier to the other and providing a grid voltage control circuit for varying the impedance linearly. CONSTITUTION:The secondary winding of a transformer 3 is divided into two and one is connected to the filament 10 of an X-ray tube 9 while the other is connected to Cockcroft-Walton multistage voltage multiplier circuit 4. The output is connected to a grid voltage control circuit 6 for varying the impedance linearly and controlled by a grid voltage control signal supply circuit 5 for comparing between one input obtained from a grid voltage feedback circuit and a grid voltage setting signal thus to control the voltage of the grid 11 of the X-ray tube 9. By employing a multistage voltage multiplier 4, the secondary voltage of the filament transformer 3 can be lowered while the manufacture is facilitated and the size is reduced. |
