一种X射线机高频高压电源的设计

A design of high-voltage power supply with high-frequency of X-ray machine

目的:设计一种X射线机高频高压电源,为X射线球管提供稳定的直流高压。方法:基于中高频逆变技术原理,采用7805电源芯片设计电源电路、无源晶振设计晶振电路,选用1n4007设计复位电路;选择PIC18F4520芯片进行CPU控制,采用MOSFET器件设计驱动电路,并用数码显示其工作状态。结果:设计的高频高压电源可通过电路实时监测电压值,测试输出电压显示电压稳定,纹波系数小;能够将15 V左右的电源升高600～700 V,并输出理想的电压值,基本符合X射线管所需电压的要求。结论:高频高压发生器的设计优点在于原理简单,易于测试,可使高频高压发生器能实现对电压的变换。

Objective: To design a high-voltage power supply with high-frequency of X-ray machine so as to provide stable high direct voltage for X-ray bulb tube. Methods: Based on the principle of inverter technology with mediumhigh frequency, 7805 power supply chip was adopted to design power circuit, and passive crystal oscillator was adopted to design crystal oscillator circuit, and 1n4007 was chosen to design reset circuit. Besides, the PIC18F4520 chip was chosen to implement CPU control, and MOSFET device was adopted to design driver circuit, and digital display was used to introduce its working situation. Results: The designed high voltage power supply with high frequency could real-timely monitor the voltage value through the circuit. By testing the output voltage, the results indicated the voltage was stable and the ripple coefficient was small during the output voltage. And it could raise the voltage of power supply from approximate 15V to approximate 600-700V, and could output the ideal voltage value. It basically met the requirements of X-ray tube for voltage. Conclusion: The advantage of this research design about high pressure generator with high frequency is that its principle is simple, and it is easy to be tested. And it can make high pressure generator with high frequency to realize conversion for voltage.