| 摘要 |
An X-ray apparatus, after an AC output from an AC power source is rectified by a first rectifier circuit, supplies it to a primary winding side of a high-tension transformer through a bridge inverter. The bridge inverter includes first and second switching elements arranged at its first and second arms and operating as high-frequency choppers, a third switching element and first parallel circuit arranged at its third arm and forming a closed circuit together with the primary winding of the high-tension transformer, and a fourth switching element Q4 and second parallel circuit arranged at its fourth arm and forming a closed circuit together with the primary winding of the high-frequency transformer, the first parallel circuit being connected in series with the third switching element and comprised of a diode and resistor and the second parallel circuit being connected in series with the fourth switching element and comprised of a diode and resistor. An energy stored in the primary winding of the high-tension transformer is released through the closed circuit. A high-voltage output induced in the secondary winding of the high-tension transformer is applied to the X-ray tube through a second rectifier circuit. A voltage applied to the X-ray tube is detected at a voltage detection circuit and controlled in the feedback control circuit. Control signals are supplied to the respective arms of the bridge inverter so that the voltage to be applied to the X-ray tube becomes a predetermined value. |
