DC/AC POWER INVERTER CONTROL UNIT OF A RESONANT POWER CONVERTER CIRCUIT, IN PARTICULAR A DC/DC CONVERTER FOR USE IN A HIGH-VOLTAGE GENERATOR CIRCUITRY OF A MODERN COMPUTED TOMOGRAPHY DEVICE OR X-RAY RADIOGRAPHIC SYSTEM

摘要

The present invention refers to a DC/AC power inverter control unit of a resonant-type power converter circuit (400), in particular a DC/DC converter, for supplying an output power for use in, for example, a high-voltage generator circuitry of an X-ray radiographic imaging system, 3D rotational angiography device or X-ray computed tomography device of the fan- or cone-beam type. More particularly, the present invention is directed to a resonant-type power converter circuit which comprises an interphase transformer (406) connected in series to at least one series resonant tank circuit (403a and 403a’ or 403b and 403b’) at the output of two DC/AC power inverter stages (402a+b) supplying a multi-primary winding high- voltage transformer (404), wherein said inte rphase transformer (406) serves for removing the difference (DI) in the resonant output currents (I1 and I2) of the DC/AC power inverter stages (402a+b). Furthermore, the present invention is dedicated to a control method which assures that the interphase transformer (406) is not saturated. This control method ensures zero current operation and provides for that input power losses can be minimized. FIGS. 5 and 7