| Abstract |
Because of their tolerance of transformer nonidealities, resonant converters appearwell-suited to high-voltage applications. Conventional dc power supplies are normally designed for constant power applications and do not perform well under the extremely wide range of load variations involved in fast and precisely driving a resistive X-ray tube load to emit x-rays over wide output dc voltage range. In this paper, a high-voltage DC power supply specially designed for a medical-use X ray power generator application that uses a series-resonant circuit topology, a high frequency high-voltage transformer, a high-voltage diode rectifier at dc high-voltage output-side, an optimal digital servo and repretitive learning control scheme has newly been developed. The superior output dc waveforms with fast rise times and low ripple factor over extremely wide output range, which are the most important specifications in evaluating a complete x-ray power generator, have been performed. The principles of operation and performances are illustrated and varified on a experimental circuit and are in good agreement with the simulation. |
