| 摘要 |
PURPOSE:To negate the voltage fluctuation of a power source part and thereby keep stably the tube voltage of an X-ray tube, by controlling the duty-ratio of a chopper with the passage of the voltage fluctuation of the power source part in an X-ray apparatus. CONSTITUTION:A feedforward controlling means 59 composed of the following means, calculator, setting circuit, and driving part is porvided in the apparatus. The means which detects the voltage of a power source part 31; the calculator 56 which calculates the tube voltage setting signal fed from a tube voltage setting part 55 by means of the detecting signal fed from an insulated wire amplifier; the duty-ratio setting circuit 57 which sets the duty-ratio of a chopper part 34 by means of a calculating signal fed from the calcualtor 56; and the chopper driving part 53 which drives the chopper 34 by means of the duty-ratio setting fed from the duty-ratio setting circuit 57. And even if the output voltage of the power source part 31 is unstable because of a ripple or the like, the duty- ratio of the chopper part 34 is forced to control inversely proportional to the output voltage of the power source part 31. Consequently, the tube voltage of an X-ray tube 52 is stably maintained. |
