The Study Of ASR-800 Helical X-ray CT Scanner High Voltage Generator

CT imaging technology is a major invention in the field of radiology. X-ray CT caused a leap in X-ray diagnosis technology. At present X-ray CT is one of the necessary equipments in large and medium-sized hospitals and even some small hospitals to diagnose the human body lesions exact location and details. The high-frequency high voltage generator, which is one of the important components of the CT machine, can supply a stable high-pressure that is a necessary condition of pipe to produce high-quality X-ray. So the performance and life of high-voltage generator cause for universal attention. The entire medical device industry is constantly developing into a longer life expectancy, more reliability and stability of the higher high-voltage generator. The study of high-voltage generator in China has a low starting point, which urgently requires our research staff put in more effort to study the high-voltage generator, to catch up with the world's advanced level, to provide high quality diagnostic imaging equipment for human.In this paper, we introduced the position of high voltage generator in the CT at first. Then we had a detailed analysis of the working principle of high-voltage generator, and did a detailed analysis and the principles of the high-voltage generator of ASR-800 spiral CT. We also did a detailed study for PWM control technology. We also introduced the UC3525 chip and IGBT module's internal structure and working principle and the working process.Chapter 3 is the focus of this paper. In this chapter we made an in-depth study on the high-frequency high voltage transformer design steps and design production process. We proposed approach for the issues in high voltage transformers production process. Finally, some types of transformer losses were summarized.In chapter 4 we introduced the reasons of transformer vacuum impregnation and the attention matters. Chapter 5 introduced several typical high-voltage generators.We made a high-voltage generator that had the 130 KV output voltage, the 65 mA largest output current, the 20 kHz frequency. We made rigorous testing for its electric and physical parameters, and made no-load and load high-pressure experiments. Preliminary results show that the high-frequency high voltage transformer can work for five minutes in the 150 KV/60mA under the load, and work stability under the output power of 130 KV/50mA. The results meet or exceed the design requirementsFinally, this article made a briefly summary on the study of the process of high voltage transformer, and summed up the prospect of the industry and trends of the future.