外电源(单相220或者三相380)先整流成直流电，然后逆变成高频交流电，再通过高压发生器（变压器）升压和整流后给球管供电，以产生受控的X射线。

The external power supply (single-phase 220 or three phase 380) is rectified to DC power first, then converse to high frequency alternating current, and then supplied to the ball tube through high voltage generator (transformer) after boosting and rectifying, so as to generate controlled X ray.