| 摘要 |
PURPOSE:To suppress a ripple portion of tube voltage to be given to an X-ray tube by performing timing control so as to shift the timing of mutual switching drive control by a prescribed phase difference. CONSTITUTION:Predrivers D1 and D2 generating pulses for driving inverters generate two phase pulses having phases mutually different by 180 deg. from the pulse generated by a pulse generation circuit PD for being given to the gates of GTO thyristors S1-S4 in order to make them to switch reciprocally for every system while mutually changing over the directions of the currents impressed on respective primary sides of high voltage transformers T1 and T2. It is so constituted that the predriver PD makes the pulses to be generated to have a phase difference of alpha so as to make the output pulses of the inverter drive circuits D1 and D2 to mutually have a phase difference of alpha so that one may be given to the inverter drive circuit D1 and the other may be given to the inverter drive circuit D2. |
